| /* |
| * xHCI host controller driver |
| * |
| * Copyright (C) 2008 Intel Corp. |
| * |
| * Author: Sarah Sharp |
| * Some code borrowed from the Linux EHCI driver. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software Foundation, |
| * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #include <linux/pci.h> |
| #include <linux/irq.h> |
| #include <linux/log2.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/slab.h> |
| #include <linux/dmi.h> |
| #include <linux/dma-mapping.h> |
| |
| #include "xhci.h" |
| #include "xhci-trace.h" |
| |
| #define DRIVER_AUTHOR "Sarah Sharp" |
| #define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver" |
| |
| #define PORT_WAKE_BITS (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E) |
| |
| /* Some 0.95 hardware can't handle the chain bit on a Link TRB being cleared */ |
| static int link_quirk; |
| module_param(link_quirk, int, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(link_quirk, "Don't clear the chain bit on a link TRB"); |
| |
| static unsigned int quirks; |
| module_param(quirks, uint, S_IRUGO); |
| MODULE_PARM_DESC(quirks, "Bit flags for quirks to be enabled as default"); |
| |
| /* TODO: copied from ehci-hcd.c - can this be refactored? */ |
| /* |
| * xhci_handshake - spin reading hc until handshake completes or fails |
| * @ptr: address of hc register to be read |
| * @mask: bits to look at in result of read |
| * @done: value of those bits when handshake succeeds |
| * @usec: timeout in microseconds |
| * |
| * Returns negative errno, or zero on success |
| * |
| * Success happens when the "mask" bits have the specified value (hardware |
| * handshake done). There are two failure modes: "usec" have passed (major |
| * hardware flakeout), or the register reads as all-ones (hardware removed). |
| */ |
| int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, int usec) |
| { |
| u32 result; |
| |
| do { |
| result = readl(ptr); |
| if (result == ~(u32)0) /* card removed */ |
| return -ENODEV; |
| result &= mask; |
| if (result == done) |
| return 0; |
| udelay(1); |
| usec--; |
| } while (usec > 0); |
| return -ETIMEDOUT; |
| } |
| |
| /* |
| * Disable interrupts and begin the xHCI halting process. |
| */ |
| void xhci_quiesce(struct xhci_hcd *xhci) |
| { |
| u32 halted; |
| u32 cmd; |
| u32 mask; |
| |
| mask = ~(XHCI_IRQS); |
| halted = readl(&xhci->op_regs->status) & STS_HALT; |
| if (!halted) |
| mask &= ~CMD_RUN; |
| |
| cmd = readl(&xhci->op_regs->command); |
| cmd &= mask; |
| writel(cmd, &xhci->op_regs->command); |
| } |
| |
| /* |
| * Force HC into halt state. |
| * |
| * Disable any IRQs and clear the run/stop bit. |
| * HC will complete any current and actively pipelined transactions, and |
| * should halt within 16 ms of the run/stop bit being cleared. |
| * Read HC Halted bit in the status register to see when the HC is finished. |
| */ |
| int xhci_halt(struct xhci_hcd *xhci) |
| { |
| int ret; |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Halt the HC"); |
| xhci_quiesce(xhci); |
| |
| ret = xhci_handshake(&xhci->op_regs->status, |
| STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC); |
| if (!ret) { |
| xhci->xhc_state |= XHCI_STATE_HALTED; |
| xhci->cmd_ring_state = CMD_RING_STATE_STOPPED; |
| } else |
| xhci_warn(xhci, "Host not halted after %u microseconds.\n", |
| XHCI_MAX_HALT_USEC); |
| return ret; |
| } |
| |
| /* |
| * Set the run bit and wait for the host to be running. |
| */ |
| static int xhci_start(struct xhci_hcd *xhci) |
| { |
| u32 temp; |
| int ret; |
| |
| temp = readl(&xhci->op_regs->command); |
| temp |= (CMD_RUN); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Turn on HC, cmd = 0x%x.", |
| temp); |
| writel(temp, &xhci->op_regs->command); |
| |
| /* |
| * Wait for the HCHalted Status bit to be 0 to indicate the host is |
| * running. |
| */ |
| ret = xhci_handshake(&xhci->op_regs->status, |
| STS_HALT, 0, XHCI_MAX_HALT_USEC); |
| if (ret == -ETIMEDOUT) |
| xhci_err(xhci, "Host took too long to start, " |
| "waited %u microseconds.\n", |
| XHCI_MAX_HALT_USEC); |
| if (!ret) |
| /* clear state flags. Including dying, halted or removing */ |
| xhci->xhc_state = 0; |
| |
| return ret; |
| } |
| |
| /* |
| * Reset a halted HC. |
| * |
| * This resets pipelines, timers, counters, state machines, etc. |
| * Transactions will be terminated immediately, and operational registers |
| * will be set to their defaults. |
| */ |
| int xhci_reset(struct xhci_hcd *xhci) |
| { |
| u32 command; |
| u32 state; |
| int ret, i; |
| |
| state = readl(&xhci->op_regs->status); |
| if ((state & STS_HALT) == 0) { |
| xhci_warn(xhci, "Host controller not halted, aborting reset.\n"); |
| return 0; |
| } |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Reset the HC"); |
| command = readl(&xhci->op_regs->command); |
| command |= CMD_RESET; |
| writel(command, &xhci->op_regs->command); |
| |
| /* Existing Intel xHCI controllers require a delay of 1 mS, |
| * after setting the CMD_RESET bit, and before accessing any |
| * HC registers. This allows the HC to complete the |
| * reset operation and be ready for HC register access. |
| * Without this delay, the subsequent HC register access, |
| * may result in a system hang very rarely. |
| */ |
| if (xhci->quirks & XHCI_INTEL_HOST) |
| udelay(1000); |
| |
| ret = xhci_handshake(&xhci->op_regs->command, |
| CMD_RESET, 0, 10 * 1000 * 1000); |
| if (ret) |
| return ret; |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "Wait for controller to be ready for doorbell rings"); |
| /* |
| * xHCI cannot write to any doorbells or operational registers other |
| * than status until the "Controller Not Ready" flag is cleared. |
| */ |
| ret = xhci_handshake(&xhci->op_regs->status, |
| STS_CNR, 0, 10 * 1000 * 1000); |
| |
| for (i = 0; i < 2; ++i) { |
| xhci->bus_state[i].port_c_suspend = 0; |
| xhci->bus_state[i].suspended_ports = 0; |
| xhci->bus_state[i].resuming_ports = 0; |
| } |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_PCI |
| static int xhci_free_msi(struct xhci_hcd *xhci) |
| { |
| int i; |
| |
| if (!xhci->msix_entries) |
| return -EINVAL; |
| |
| for (i = 0; i < xhci->msix_count; i++) |
| if (xhci->msix_entries[i].vector) |
| free_irq(xhci->msix_entries[i].vector, |
| xhci_to_hcd(xhci)); |
| return 0; |
| } |
| |
| /* |
| * Set up MSI |
| */ |
| static int xhci_setup_msi(struct xhci_hcd *xhci) |
| { |
| int ret; |
| struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); |
| |
| ret = pci_enable_msi(pdev); |
| if (ret) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "failed to allocate MSI entry"); |
| return ret; |
| } |
| |
| ret = request_irq(pdev->irq, xhci_msi_irq, |
| 0, "xhci_hcd", xhci_to_hcd(xhci)); |
| if (ret) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "disable MSI interrupt"); |
| pci_disable_msi(pdev); |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Free IRQs |
| * free all IRQs request |
| */ |
| static void xhci_free_irq(struct xhci_hcd *xhci) |
| { |
| struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); |
| int ret; |
| |
| /* return if using legacy interrupt */ |
| if (xhci_to_hcd(xhci)->irq > 0) |
| return; |
| |
| ret = xhci_free_msi(xhci); |
| if (!ret) |
| return; |
| if (pdev->irq > 0) |
| free_irq(pdev->irq, xhci_to_hcd(xhci)); |
| |
| return; |
| } |
| |
| /* |
| * Set up MSI-X |
| */ |
| static int xhci_setup_msix(struct xhci_hcd *xhci) |
| { |
| int i, ret = 0; |
| struct usb_hcd *hcd = xhci_to_hcd(xhci); |
| struct pci_dev *pdev = to_pci_dev(hcd->self.controller); |
| |
| /* |
| * calculate number of msi-x vectors supported. |
| * - HCS_MAX_INTRS: the max number of interrupts the host can handle, |
| * with max number of interrupters based on the xhci HCSPARAMS1. |
| * - num_online_cpus: maximum msi-x vectors per CPUs core. |
| * Add additional 1 vector to ensure always available interrupt. |
| */ |
| xhci->msix_count = min(num_online_cpus() + 1, |
| HCS_MAX_INTRS(xhci->hcs_params1)); |
| |
| xhci->msix_entries = |
| kmalloc((sizeof(struct msix_entry))*xhci->msix_count, |
| GFP_KERNEL); |
| if (!xhci->msix_entries) { |
| xhci_err(xhci, "Failed to allocate MSI-X entries\n"); |
| return -ENOMEM; |
| } |
| |
| for (i = 0; i < xhci->msix_count; i++) { |
| xhci->msix_entries[i].entry = i; |
| xhci->msix_entries[i].vector = 0; |
| } |
| |
| ret = pci_enable_msix_exact(pdev, xhci->msix_entries, xhci->msix_count); |
| if (ret) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "Failed to enable MSI-X"); |
| goto free_entries; |
| } |
| |
| for (i = 0; i < xhci->msix_count; i++) { |
| ret = request_irq(xhci->msix_entries[i].vector, |
| xhci_msi_irq, |
| 0, "xhci_hcd", xhci_to_hcd(xhci)); |
| if (ret) |
| goto disable_msix; |
| } |
| |
| hcd->msix_enabled = 1; |
| return ret; |
| |
| disable_msix: |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, "disable MSI-X interrupt"); |
| xhci_free_irq(xhci); |
| pci_disable_msix(pdev); |
| free_entries: |
| kfree(xhci->msix_entries); |
| xhci->msix_entries = NULL; |
| return ret; |
| } |
| |
| /* Free any IRQs and disable MSI-X */ |
| static void xhci_cleanup_msix(struct xhci_hcd *xhci) |
| { |
| struct usb_hcd *hcd = xhci_to_hcd(xhci); |
| struct pci_dev *pdev = to_pci_dev(hcd->self.controller); |
| |
| if (xhci->quirks & XHCI_PLAT) |
| return; |
| |
| xhci_free_irq(xhci); |
| |
| if (xhci->msix_entries) { |
| pci_disable_msix(pdev); |
| kfree(xhci->msix_entries); |
| xhci->msix_entries = NULL; |
| } else { |
| pci_disable_msi(pdev); |
| } |
| |
| hcd->msix_enabled = 0; |
| return; |
| } |
| |
| static void __maybe_unused xhci_msix_sync_irqs(struct xhci_hcd *xhci) |
| { |
| int i; |
| |
| if (xhci->msix_entries) { |
| for (i = 0; i < xhci->msix_count; i++) |
| synchronize_irq(xhci->msix_entries[i].vector); |
| } |
| } |
| |
| static int xhci_try_enable_msi(struct usb_hcd *hcd) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| struct pci_dev *pdev; |
| int ret; |
| |
| /* The xhci platform device has set up IRQs through usb_add_hcd. */ |
| if (xhci->quirks & XHCI_PLAT) |
| return 0; |
| |
| pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); |
| /* |
| * Some Fresco Logic host controllers advertise MSI, but fail to |
| * generate interrupts. Don't even try to enable MSI. |
| */ |
| if (xhci->quirks & XHCI_BROKEN_MSI) |
| goto legacy_irq; |
| |
| /* unregister the legacy interrupt */ |
| if (hcd->irq) |
| free_irq(hcd->irq, hcd); |
| hcd->irq = 0; |
| |
| ret = xhci_setup_msix(xhci); |
| if (ret) |
| /* fall back to msi*/ |
| ret = xhci_setup_msi(xhci); |
| |
| if (!ret) |
| /* hcd->irq is 0, we have MSI */ |
| return 0; |
| |
| if (!pdev->irq) { |
| xhci_err(xhci, "No msi-x/msi found and no IRQ in BIOS\n"); |
| return -EINVAL; |
| } |
| |
| legacy_irq: |
| if (!strlen(hcd->irq_descr)) |
| snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d", |
| hcd->driver->description, hcd->self.busnum); |
| |
| /* fall back to legacy interrupt*/ |
| ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED, |
| hcd->irq_descr, hcd); |
| if (ret) { |
| xhci_err(xhci, "request interrupt %d failed\n", |
| pdev->irq); |
| return ret; |
| } |
| hcd->irq = pdev->irq; |
| return 0; |
| } |
| |
| #else |
| |
| static inline int xhci_try_enable_msi(struct usb_hcd *hcd) |
| { |
| return 0; |
| } |
| |
| static inline void xhci_cleanup_msix(struct xhci_hcd *xhci) |
| { |
| } |
| |
| static inline void xhci_msix_sync_irqs(struct xhci_hcd *xhci) |
| { |
| } |
| |
| #endif |
| |
| static void compliance_mode_recovery(unsigned long arg) |
| { |
| struct xhci_hcd *xhci; |
| struct usb_hcd *hcd; |
| u32 temp; |
| int i; |
| |
| xhci = (struct xhci_hcd *)arg; |
| |
| for (i = 0; i < xhci->num_usb3_ports; i++) { |
| temp = readl(xhci->usb3_ports[i]); |
| if ((temp & PORT_PLS_MASK) == USB_SS_PORT_LS_COMP_MOD) { |
| /* |
| * Compliance Mode Detected. Letting USB Core |
| * handle the Warm Reset |
| */ |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Compliance mode detected->port %d", |
| i + 1); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Attempting compliance mode recovery"); |
| hcd = xhci->shared_hcd; |
| |
| if (hcd->state == HC_STATE_SUSPENDED) |
| usb_hcd_resume_root_hub(hcd); |
| |
| usb_hcd_poll_rh_status(hcd); |
| } |
| } |
| |
| if (xhci->port_status_u0 != ((1 << xhci->num_usb3_ports)-1)) |
| mod_timer(&xhci->comp_mode_recovery_timer, |
| jiffies + msecs_to_jiffies(COMP_MODE_RCVRY_MSECS)); |
| } |
| |
| /* |
| * Quirk to work around issue generated by the SN65LVPE502CP USB3.0 re-driver |
| * that causes ports behind that hardware to enter compliance mode sometimes. |
| * The quirk creates a timer that polls every 2 seconds the link state of |
| * each host controller's port and recovers it by issuing a Warm reset |
| * if Compliance mode is detected, otherwise the port will become "dead" (no |
| * device connections or disconnections will be detected anymore). Becasue no |
| * status event is generated when entering compliance mode (per xhci spec), |
| * this quirk is needed on systems that have the failing hardware installed. |
| */ |
| static void compliance_mode_recovery_timer_init(struct xhci_hcd *xhci) |
| { |
| xhci->port_status_u0 = 0; |
| setup_timer(&xhci->comp_mode_recovery_timer, |
| compliance_mode_recovery, (unsigned long)xhci); |
| xhci->comp_mode_recovery_timer.expires = jiffies + |
| msecs_to_jiffies(COMP_MODE_RCVRY_MSECS); |
| |
| set_timer_slack(&xhci->comp_mode_recovery_timer, |
| msecs_to_jiffies(COMP_MODE_RCVRY_MSECS)); |
| add_timer(&xhci->comp_mode_recovery_timer); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Compliance mode recovery timer initialized"); |
| } |
| |
| /* |
| * This function identifies the systems that have installed the SN65LVPE502CP |
| * USB3.0 re-driver and that need the Compliance Mode Quirk. |
| * Systems: |
| * Vendor: Hewlett-Packard -> System Models: Z420, Z620 and Z820 |
| */ |
| static bool xhci_compliance_mode_recovery_timer_quirk_check(void) |
| { |
| const char *dmi_product_name, *dmi_sys_vendor; |
| |
| dmi_product_name = dmi_get_system_info(DMI_PRODUCT_NAME); |
| dmi_sys_vendor = dmi_get_system_info(DMI_SYS_VENDOR); |
| if (!dmi_product_name || !dmi_sys_vendor) |
| return false; |
| |
| if (!(strstr(dmi_sys_vendor, "Hewlett-Packard"))) |
| return false; |
| |
| if (strstr(dmi_product_name, "Z420") || |
| strstr(dmi_product_name, "Z620") || |
| strstr(dmi_product_name, "Z820") || |
| strstr(dmi_product_name, "Z1 Workstation")) |
| return true; |
| |
| return false; |
| } |
| |
| static int xhci_all_ports_seen_u0(struct xhci_hcd *xhci) |
| { |
| return (xhci->port_status_u0 == ((1 << xhci->num_usb3_ports)-1)); |
| } |
| |
| |
| /* |
| * Initialize memory for HCD and xHC (one-time init). |
| * |
| * Program the PAGESIZE register, initialize the device context array, create |
| * device contexts (?), set up a command ring segment (or two?), create event |
| * ring (one for now). |
| */ |
| int xhci_init(struct usb_hcd *hcd) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| int retval = 0; |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, "xhci_init"); |
| spin_lock_init(&xhci->lock); |
| if (xhci->hci_version == 0x95 && link_quirk) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "QUIRK: Not clearing Link TRB chain bits."); |
| xhci->quirks |= XHCI_LINK_TRB_QUIRK; |
| } else { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "xHCI doesn't need link TRB QUIRK"); |
| } |
| retval = xhci_mem_init(xhci, GFP_KERNEL); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Finished xhci_init"); |
| |
| /* Initializing Compliance Mode Recovery Data If Needed */ |
| if (xhci_compliance_mode_recovery_timer_quirk_check()) { |
| xhci->quirks |= XHCI_COMP_MODE_QUIRK; |
| compliance_mode_recovery_timer_init(xhci); |
| } |
| |
| return retval; |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| |
| static int xhci_run_finished(struct xhci_hcd *xhci) |
| { |
| if (xhci_start(xhci)) { |
| xhci_halt(xhci); |
| return -ENODEV; |
| } |
| xhci->shared_hcd->state = HC_STATE_RUNNING; |
| xhci->cmd_ring_state = CMD_RING_STATE_RUNNING; |
| |
| if (xhci->quirks & XHCI_NEC_HOST) |
| xhci_ring_cmd_db(xhci); |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "Finished xhci_run for USB3 roothub"); |
| return 0; |
| } |
| |
| /* |
| * Start the HC after it was halted. |
| * |
| * This function is called by the USB core when the HC driver is added. |
| * Its opposite is xhci_stop(). |
| * |
| * xhci_init() must be called once before this function can be called. |
| * Reset the HC, enable device slot contexts, program DCBAAP, and |
| * set command ring pointer and event ring pointer. |
| * |
| * Setup MSI-X vectors and enable interrupts. |
| */ |
| int xhci_run(struct usb_hcd *hcd) |
| { |
| u32 temp; |
| u64 temp_64; |
| int ret; |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| |
| /* Start the xHCI host controller running only after the USB 2.0 roothub |
| * is setup. |
| */ |
| |
| hcd->uses_new_polling = 1; |
| if (!usb_hcd_is_primary_hcd(hcd)) |
| return xhci_run_finished(xhci); |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, "xhci_run"); |
| |
| ret = xhci_try_enable_msi(hcd); |
| if (ret) |
| return ret; |
| |
| xhci_dbg(xhci, "Command ring memory map follows:\n"); |
| xhci_debug_ring(xhci, xhci->cmd_ring); |
| xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring); |
| xhci_dbg_cmd_ptrs(xhci); |
| |
| xhci_dbg(xhci, "ERST memory map follows:\n"); |
| xhci_dbg_erst(xhci, &xhci->erst); |
| xhci_dbg(xhci, "Event ring:\n"); |
| xhci_debug_ring(xhci, xhci->event_ring); |
| xhci_dbg_ring_ptrs(xhci, xhci->event_ring); |
| temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); |
| temp_64 &= ~ERST_PTR_MASK; |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "ERST deq = 64'h%0lx", (long unsigned int) temp_64); |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "// Set the interrupt modulation register"); |
| temp = readl(&xhci->ir_set->irq_control); |
| temp &= ~ER_IRQ_INTERVAL_MASK; |
| temp |= (u32) 160; |
| writel(temp, &xhci->ir_set->irq_control); |
| |
| /* Set the HCD state before we enable the irqs */ |
| temp = readl(&xhci->op_regs->command); |
| temp |= (CMD_EIE); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "// Enable interrupts, cmd = 0x%x.", temp); |
| writel(temp, &xhci->op_regs->command); |
| |
| temp = readl(&xhci->ir_set->irq_pending); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "// Enabling event ring interrupter %p by writing 0x%x to irq_pending", |
| xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp)); |
| writel(ER_IRQ_ENABLE(temp), &xhci->ir_set->irq_pending); |
| xhci_print_ir_set(xhci, 0); |
| |
| if (xhci->quirks & XHCI_NEC_HOST) { |
| struct xhci_command *command; |
| command = xhci_alloc_command(xhci, false, false, GFP_KERNEL); |
| if (!command) |
| return -ENOMEM; |
| xhci_queue_vendor_command(xhci, command, 0, 0, 0, |
| TRB_TYPE(TRB_NEC_GET_FW)); |
| } |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "Finished xhci_run for USB2 roothub"); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(xhci_run); |
| |
| /* |
| * Stop xHCI driver. |
| * |
| * This function is called by the USB core when the HC driver is removed. |
| * Its opposite is xhci_run(). |
| * |
| * Disable device contexts, disable IRQs, and quiesce the HC. |
| * Reset the HC, finish any completed transactions, and cleanup memory. |
| */ |
| void xhci_stop(struct usb_hcd *hcd) |
| { |
| u32 temp; |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| |
| mutex_lock(&xhci->mutex); |
| |
| if (!(xhci->xhc_state & XHCI_STATE_HALTED)) { |
| spin_lock_irq(&xhci->lock); |
| |
| xhci->xhc_state |= XHCI_STATE_HALTED; |
| xhci->cmd_ring_state = CMD_RING_STATE_STOPPED; |
| xhci_halt(xhci); |
| xhci_reset(xhci); |
| |
| spin_unlock_irq(&xhci->lock); |
| } |
| |
| if (!usb_hcd_is_primary_hcd(hcd)) { |
| mutex_unlock(&xhci->mutex); |
| return; |
| } |
| |
| xhci_cleanup_msix(xhci); |
| |
| /* Deleting Compliance Mode Recovery Timer */ |
| if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && |
| (!(xhci_all_ports_seen_u0(xhci)))) { |
| del_timer_sync(&xhci->comp_mode_recovery_timer); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "%s: compliance mode recovery timer deleted", |
| __func__); |
| } |
| |
| if (xhci->quirks & XHCI_AMD_PLL_FIX) |
| usb_amd_dev_put(); |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "// Disabling event ring interrupts"); |
| temp = readl(&xhci->op_regs->status); |
| writel(temp & ~STS_EINT, &xhci->op_regs->status); |
| temp = readl(&xhci->ir_set->irq_pending); |
| writel(ER_IRQ_DISABLE(temp), &xhci->ir_set->irq_pending); |
| xhci_print_ir_set(xhci, 0); |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, "cleaning up memory"); |
| xhci_mem_cleanup(xhci); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "xhci_stop completed - status = %x", |
| readl(&xhci->op_regs->status)); |
| mutex_unlock(&xhci->mutex); |
| } |
| |
| /* |
| * Shutdown HC (not bus-specific) |
| * |
| * This is called when the machine is rebooting or halting. We assume that the |
| * machine will be powered off, and the HC's internal state will be reset. |
| * Don't bother to free memory. |
| * |
| * This will only ever be called with the main usb_hcd (the USB3 roothub). |
| */ |
| void xhci_shutdown(struct usb_hcd *hcd) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| |
| if (xhci->quirks & XHCI_SPURIOUS_REBOOT) |
| usb_disable_xhci_ports(to_pci_dev(hcd->self.controller)); |
| |
| spin_lock_irq(&xhci->lock); |
| xhci_halt(xhci); |
| /* Workaround for spurious wakeups at shutdown with HSW */ |
| if (xhci->quirks & XHCI_SPURIOUS_WAKEUP) |
| xhci_reset(xhci); |
| spin_unlock_irq(&xhci->lock); |
| |
| xhci_cleanup_msix(xhci); |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "xhci_shutdown completed - status = %x", |
| readl(&xhci->op_regs->status)); |
| |
| /* Yet another workaround for spurious wakeups at shutdown with HSW */ |
| if (xhci->quirks & XHCI_SPURIOUS_WAKEUP) |
| pci_set_power_state(to_pci_dev(hcd->self.controller), PCI_D3hot); |
| } |
| |
| #ifdef CONFIG_PM |
| static void xhci_save_registers(struct xhci_hcd *xhci) |
| { |
| xhci->s3.command = readl(&xhci->op_regs->command); |
| xhci->s3.dev_nt = readl(&xhci->op_regs->dev_notification); |
| xhci->s3.dcbaa_ptr = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr); |
| xhci->s3.config_reg = readl(&xhci->op_regs->config_reg); |
| xhci->s3.erst_size = readl(&xhci->ir_set->erst_size); |
| xhci->s3.erst_base = xhci_read_64(xhci, &xhci->ir_set->erst_base); |
| xhci->s3.erst_dequeue = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); |
| xhci->s3.irq_pending = readl(&xhci->ir_set->irq_pending); |
| xhci->s3.irq_control = readl(&xhci->ir_set->irq_control); |
| } |
| |
| static void xhci_restore_registers(struct xhci_hcd *xhci) |
| { |
| writel(xhci->s3.command, &xhci->op_regs->command); |
| writel(xhci->s3.dev_nt, &xhci->op_regs->dev_notification); |
| xhci_write_64(xhci, xhci->s3.dcbaa_ptr, &xhci->op_regs->dcbaa_ptr); |
| writel(xhci->s3.config_reg, &xhci->op_regs->config_reg); |
| writel(xhci->s3.erst_size, &xhci->ir_set->erst_size); |
| xhci_write_64(xhci, xhci->s3.erst_base, &xhci->ir_set->erst_base); |
| xhci_write_64(xhci, xhci->s3.erst_dequeue, &xhci->ir_set->erst_dequeue); |
| writel(xhci->s3.irq_pending, &xhci->ir_set->irq_pending); |
| writel(xhci->s3.irq_control, &xhci->ir_set->irq_control); |
| } |
| |
| static void xhci_set_cmd_ring_deq(struct xhci_hcd *xhci) |
| { |
| u64 val_64; |
| |
| /* step 2: initialize command ring buffer */ |
| val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); |
| val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) | |
| (xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg, |
| xhci->cmd_ring->dequeue) & |
| (u64) ~CMD_RING_RSVD_BITS) | |
| xhci->cmd_ring->cycle_state; |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "// Setting command ring address to 0x%llx", |
| (long unsigned long) val_64); |
| xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring); |
| } |
| |
| /* |
| * The whole command ring must be cleared to zero when we suspend the host. |
| * |
| * The host doesn't save the command ring pointer in the suspend well, so we |
| * need to re-program it on resume. Unfortunately, the pointer must be 64-byte |
| * aligned, because of the reserved bits in the command ring dequeue pointer |
| * register. Therefore, we can't just set the dequeue pointer back in the |
| * middle of the ring (TRBs are 16-byte aligned). |
| */ |
| static void xhci_clear_command_ring(struct xhci_hcd *xhci) |
| { |
| struct xhci_ring *ring; |
| struct xhci_segment *seg; |
| |
| ring = xhci->cmd_ring; |
| seg = ring->deq_seg; |
| do { |
| memset(seg->trbs, 0, |
| sizeof(union xhci_trb) * (TRBS_PER_SEGMENT - 1)); |
| seg->trbs[TRBS_PER_SEGMENT - 1].link.control &= |
| cpu_to_le32(~TRB_CYCLE); |
| seg = seg->next; |
| } while (seg != ring->deq_seg); |
| |
| /* Reset the software enqueue and dequeue pointers */ |
| ring->deq_seg = ring->first_seg; |
| ring->dequeue = ring->first_seg->trbs; |
| ring->enq_seg = ring->deq_seg; |
| ring->enqueue = ring->dequeue; |
| |
| ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1; |
| /* |
| * Ring is now zeroed, so the HW should look for change of ownership |
| * when the cycle bit is set to 1. |
| */ |
| ring->cycle_state = 1; |
| |
| /* |
| * Reset the hardware dequeue pointer. |
| * Yes, this will need to be re-written after resume, but we're paranoid |
| * and want to make sure the hardware doesn't access bogus memory |
| * because, say, the BIOS or an SMI started the host without changing |
| * the command ring pointers. |
| */ |
| xhci_set_cmd_ring_deq(xhci); |
| } |
| |
| static void xhci_disable_port_wake_on_bits(struct xhci_hcd *xhci) |
| { |
| int port_index; |
| __le32 __iomem **port_array; |
| unsigned long flags; |
| u32 t1, t2; |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| |
| /* disble usb3 ports Wake bits*/ |
| port_index = xhci->num_usb3_ports; |
| port_array = xhci->usb3_ports; |
| while (port_index--) { |
| t1 = readl(port_array[port_index]); |
| t1 = xhci_port_state_to_neutral(t1); |
| t2 = t1 & ~PORT_WAKE_BITS; |
| if (t1 != t2) |
| writel(t2, port_array[port_index]); |
| } |
| |
| /* disble usb2 ports Wake bits*/ |
| port_index = xhci->num_usb2_ports; |
| port_array = xhci->usb2_ports; |
| while (port_index--) { |
| t1 = readl(port_array[port_index]); |
| t1 = xhci_port_state_to_neutral(t1); |
| t2 = t1 & ~PORT_WAKE_BITS; |
| if (t1 != t2) |
| writel(t2, port_array[port_index]); |
| } |
| |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| } |
| |
| /* |
| * Stop HC (not bus-specific) |
| * |
| * This is called when the machine transition into S3/S4 mode. |
| * |
| */ |
| int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup) |
| { |
| int rc = 0; |
| unsigned int delay = XHCI_MAX_HALT_USEC; |
| struct usb_hcd *hcd = xhci_to_hcd(xhci); |
| u32 command; |
| |
| if (!hcd->state) |
| return 0; |
| |
| if (hcd->state != HC_STATE_SUSPENDED || |
| xhci->shared_hcd->state != HC_STATE_SUSPENDED) |
| return -EINVAL; |
| |
| /* Clear root port wake on bits if wakeup not allowed. */ |
| if (!do_wakeup) |
| xhci_disable_port_wake_on_bits(xhci); |
| |
| /* Don't poll the roothubs on bus suspend. */ |
| xhci_dbg(xhci, "%s: stopping port polling.\n", __func__); |
| clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); |
| del_timer_sync(&hcd->rh_timer); |
| clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags); |
| del_timer_sync(&xhci->shared_hcd->rh_timer); |
| |
| spin_lock_irq(&xhci->lock); |
| clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
| clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags); |
| /* step 1: stop endpoint */ |
| /* skipped assuming that port suspend has done */ |
| |
| /* step 2: clear Run/Stop bit */ |
| command = readl(&xhci->op_regs->command); |
| command &= ~CMD_RUN; |
| writel(command, &xhci->op_regs->command); |
| |
| /* Some chips from Fresco Logic need an extraordinary delay */ |
| delay *= (xhci->quirks & XHCI_SLOW_SUSPEND) ? 10 : 1; |
| |
| if (xhci_handshake(&xhci->op_regs->status, |
| STS_HALT, STS_HALT, delay)) { |
| xhci_warn(xhci, "WARN: xHC CMD_RUN timeout\n"); |
| spin_unlock_irq(&xhci->lock); |
| return -ETIMEDOUT; |
| } |
| xhci_clear_command_ring(xhci); |
| |
| /* step 3: save registers */ |
| xhci_save_registers(xhci); |
| |
| /* step 4: set CSS flag */ |
| command = readl(&xhci->op_regs->command); |
| command |= CMD_CSS; |
| writel(command, &xhci->op_regs->command); |
| if (xhci_handshake(&xhci->op_regs->status, |
| STS_SAVE, 0, 10 * 1000)) { |
| xhci_warn(xhci, "WARN: xHC save state timeout\n"); |
| spin_unlock_irq(&xhci->lock); |
| return -ETIMEDOUT; |
| } |
| spin_unlock_irq(&xhci->lock); |
| |
| /* |
| * Deleting Compliance Mode Recovery Timer because the xHCI Host |
| * is about to be suspended. |
| */ |
| if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && |
| (!(xhci_all_ports_seen_u0(xhci)))) { |
| del_timer_sync(&xhci->comp_mode_recovery_timer); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "%s: compliance mode recovery timer deleted", |
| __func__); |
| } |
| |
| /* step 5: remove core well power */ |
| /* synchronize irq when using MSI-X */ |
| xhci_msix_sync_irqs(xhci); |
| |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(xhci_suspend); |
| |
| /* |
| * start xHC (not bus-specific) |
| * |
| * This is called when the machine transition from S3/S4 mode. |
| * |
| */ |
| int xhci_resume(struct xhci_hcd *xhci, bool hibernated) |
| { |
| u32 command, temp = 0, status; |
| struct usb_hcd *hcd = xhci_to_hcd(xhci); |
| struct usb_hcd *secondary_hcd; |
| int retval = 0; |
| bool comp_timer_running = false; |
| |
| if (!hcd->state) |
| return 0; |
| |
| /* Wait a bit if either of the roothubs need to settle from the |
| * transition into bus suspend. |
| */ |
| if (time_before(jiffies, xhci->bus_state[0].next_statechange) || |
| time_before(jiffies, |
| xhci->bus_state[1].next_statechange)) |
| msleep(100); |
| |
| set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
| set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags); |
| |
| spin_lock_irq(&xhci->lock); |
| if (xhci->quirks & XHCI_RESET_ON_RESUME) |
| hibernated = true; |
| |
| if (!hibernated) { |
| /* step 1: restore register */ |
| xhci_restore_registers(xhci); |
| /* step 2: initialize command ring buffer */ |
| xhci_set_cmd_ring_deq(xhci); |
| /* step 3: restore state and start state*/ |
| /* step 3: set CRS flag */ |
| command = readl(&xhci->op_regs->command); |
| command |= CMD_CRS; |
| writel(command, &xhci->op_regs->command); |
| if (xhci_handshake(&xhci->op_regs->status, |
| STS_RESTORE, 0, 10 * 1000)) { |
| xhci_warn(xhci, "WARN: xHC restore state timeout\n"); |
| spin_unlock_irq(&xhci->lock); |
| return -ETIMEDOUT; |
| } |
| temp = readl(&xhci->op_regs->status); |
| } |
| |
| /* If restore operation fails, re-initialize the HC during resume */ |
| if ((temp & STS_SRE) || hibernated) { |
| |
| if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && |
| !(xhci_all_ports_seen_u0(xhci))) { |
| del_timer_sync(&xhci->comp_mode_recovery_timer); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Compliance Mode Recovery Timer deleted!"); |
| } |
| |
| /* Let the USB core know _both_ roothubs lost power. */ |
| usb_root_hub_lost_power(xhci->main_hcd->self.root_hub); |
| usb_root_hub_lost_power(xhci->shared_hcd->self.root_hub); |
| |
| xhci_dbg(xhci, "Stop HCD\n"); |
| xhci_halt(xhci); |
| xhci_reset(xhci); |
| spin_unlock_irq(&xhci->lock); |
| xhci_cleanup_msix(xhci); |
| |
| xhci_dbg(xhci, "// Disabling event ring interrupts\n"); |
| temp = readl(&xhci->op_regs->status); |
| writel(temp & ~STS_EINT, &xhci->op_regs->status); |
| temp = readl(&xhci->ir_set->irq_pending); |
| writel(ER_IRQ_DISABLE(temp), &xhci->ir_set->irq_pending); |
| xhci_print_ir_set(xhci, 0); |
| |
| xhci_dbg(xhci, "cleaning up memory\n"); |
| xhci_mem_cleanup(xhci); |
| xhci_dbg(xhci, "xhci_stop completed - status = %x\n", |
| readl(&xhci->op_regs->status)); |
| |
| /* USB core calls the PCI reinit and start functions twice: |
| * first with the primary HCD, and then with the secondary HCD. |
| * If we don't do the same, the host will never be started. |
| */ |
| if (!usb_hcd_is_primary_hcd(hcd)) |
| secondary_hcd = hcd; |
| else |
| secondary_hcd = xhci->shared_hcd; |
| |
| xhci_dbg(xhci, "Initialize the xhci_hcd\n"); |
| retval = xhci_init(hcd->primary_hcd); |
| if (retval) |
| return retval; |
| comp_timer_running = true; |
| |
| xhci_dbg(xhci, "Start the primary HCD\n"); |
| retval = xhci_run(hcd->primary_hcd); |
| if (!retval) { |
| xhci_dbg(xhci, "Start the secondary HCD\n"); |
| retval = xhci_run(secondary_hcd); |
| } |
| hcd->state = HC_STATE_SUSPENDED; |
| xhci->shared_hcd->state = HC_STATE_SUSPENDED; |
| goto done; |
| } |
| |
| /* step 4: set Run/Stop bit */ |
| command = readl(&xhci->op_regs->command); |
| command |= CMD_RUN; |
| writel(command, &xhci->op_regs->command); |
| xhci_handshake(&xhci->op_regs->status, STS_HALT, |
| 0, 250 * 1000); |
| |
| /* step 5: walk topology and initialize portsc, |
| * portpmsc and portli |
| */ |
| /* this is done in bus_resume */ |
| |
| /* step 6: restart each of the previously |
| * Running endpoints by ringing their doorbells |
| */ |
| |
| spin_unlock_irq(&xhci->lock); |
| |
| done: |
| if (retval == 0) { |
| /* Resume root hubs only when have pending events. */ |
| status = readl(&xhci->op_regs->status); |
| if (status & STS_EINT) { |
| usb_hcd_resume_root_hub(xhci->shared_hcd); |
| usb_hcd_resume_root_hub(hcd); |
| } |
| } |
| |
| /* |
| * If system is subject to the Quirk, Compliance Mode Timer needs to |
| * be re-initialized Always after a system resume. Ports are subject |
| * to suffer the Compliance Mode issue again. It doesn't matter if |
| * ports have entered previously to U0 before system's suspension. |
| */ |
| if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && !comp_timer_running) |
| compliance_mode_recovery_timer_init(xhci); |
| |
| /* Re-enable port polling. */ |
| xhci_dbg(xhci, "%s: starting port polling.\n", __func__); |
| set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags); |
| usb_hcd_poll_rh_status(xhci->shared_hcd); |
| set_bit(HCD_FLAG_POLL_RH, &hcd->flags); |
| usb_hcd_poll_rh_status(hcd); |
| |
| return retval; |
| } |
| EXPORT_SYMBOL_GPL(xhci_resume); |
| #endif /* CONFIG_PM */ |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /** |
| * xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and |
| * HCDs. Find the index for an endpoint given its descriptor. Use the return |
| * value to right shift 1 for the bitmask. |
| * |
| * Index = (epnum * 2) + direction - 1, |
| * where direction = 0 for OUT, 1 for IN. |
| * For control endpoints, the IN index is used (OUT index is unused), so |
| * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2) |
| */ |
| unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc) |
| { |
| unsigned int index; |
| if (usb_endpoint_xfer_control(desc)) |
| index = (unsigned int) (usb_endpoint_num(desc)*2); |
| else |
| index = (unsigned int) (usb_endpoint_num(desc)*2) + |
| (usb_endpoint_dir_in(desc) ? 1 : 0) - 1; |
| return index; |
| } |
| |
| /* The reverse operation to xhci_get_endpoint_index. Calculate the USB endpoint |
| * address from the XHCI endpoint index. |
| */ |
| unsigned int xhci_get_endpoint_address(unsigned int ep_index) |
| { |
| unsigned int number = DIV_ROUND_UP(ep_index, 2); |
| unsigned int direction = ep_index % 2 ? USB_DIR_OUT : USB_DIR_IN; |
| return direction | number; |
| } |
| |
| /* Find the flag for this endpoint (for use in the control context). Use the |
| * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is |
| * bit 1, etc. |
| */ |
| unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc) |
| { |
| return 1 << (xhci_get_endpoint_index(desc) + 1); |
| } |
| |
| /* Find the flag for this endpoint (for use in the control context). Use the |
| * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is |
| * bit 1, etc. |
| */ |
| unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index) |
| { |
| return 1 << (ep_index + 1); |
| } |
| |
| /* Compute the last valid endpoint context index. Basically, this is the |
| * endpoint index plus one. For slot contexts with more than valid endpoint, |
| * we find the most significant bit set in the added contexts flags. |
| * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000 |
| * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one. |
| */ |
| unsigned int xhci_last_valid_endpoint(u32 added_ctxs) |
| { |
| return fls(added_ctxs) - 1; |
| } |
| |
| /* Returns 1 if the arguments are OK; |
| * returns 0 this is a root hub; returns -EINVAL for NULL pointers. |
| */ |
| static int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev, |
| struct usb_host_endpoint *ep, int check_ep, bool check_virt_dev, |
| const char *func) { |
| struct xhci_hcd *xhci; |
| struct xhci_virt_device *virt_dev; |
| |
| if (!hcd || (check_ep && !ep) || !udev) { |
| pr_debug("xHCI %s called with invalid args\n", func); |
| return -EINVAL; |
| } |
| if (!udev->parent) { |
| pr_debug("xHCI %s called for root hub\n", func); |
| return 0; |
| } |
| |
| xhci = hcd_to_xhci(hcd); |
| if (check_virt_dev) { |
| if (!udev->slot_id || !xhci->devs[udev->slot_id]) { |
| xhci_dbg(xhci, "xHCI %s called with unaddressed device\n", |
| func); |
| return -EINVAL; |
| } |
| |
| virt_dev = xhci->devs[udev->slot_id]; |
| if (virt_dev->udev != udev) { |
| xhci_dbg(xhci, "xHCI %s called with udev and " |
| "virt_dev does not match\n", func); |
| return -EINVAL; |
| } |
| } |
| |
| if (xhci->xhc_state & XHCI_STATE_HALTED) |
| return -ENODEV; |
| |
| return 1; |
| } |
| |
| static int xhci_configure_endpoint(struct xhci_hcd *xhci, |
| struct usb_device *udev, struct xhci_command *command, |
| bool ctx_change, bool must_succeed); |
| |
| /* |
| * Full speed devices may have a max packet size greater than 8 bytes, but the |
| * USB core doesn't know that until it reads the first 8 bytes of the |
| * descriptor. If the usb_device's max packet size changes after that point, |
| * we need to issue an evaluate context command and wait on it. |
| */ |
| static int xhci_check_maxpacket(struct xhci_hcd *xhci, unsigned int slot_id, |
| unsigned int ep_index, struct urb *urb) |
| { |
| struct xhci_container_ctx *out_ctx; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| struct xhci_ep_ctx *ep_ctx; |
| struct xhci_command *command; |
| int max_packet_size; |
| int hw_max_packet_size; |
| int ret = 0; |
| |
| out_ctx = xhci->devs[slot_id]->out_ctx; |
| ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index); |
| hw_max_packet_size = MAX_PACKET_DECODED(le32_to_cpu(ep_ctx->ep_info2)); |
| max_packet_size = usb_endpoint_maxp(&urb->dev->ep0.desc); |
| if (hw_max_packet_size != max_packet_size) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_context_change, |
| "Max Packet Size for ep 0 changed."); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_context_change, |
| "Max packet size in usb_device = %d", |
| max_packet_size); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_context_change, |
| "Max packet size in xHCI HW = %d", |
| hw_max_packet_size); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_context_change, |
| "Issuing evaluate context command."); |
| |
| /* Set up the input context flags for the command */ |
| /* FIXME: This won't work if a non-default control endpoint |
| * changes max packet sizes. |
| */ |
| |
| command = xhci_alloc_command(xhci, false, true, GFP_KERNEL); |
| if (!command) |
| return -ENOMEM; |
| |
| command->in_ctx = xhci->devs[slot_id]->in_ctx; |
| ctrl_ctx = xhci_get_input_control_ctx(command->in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| ret = -ENOMEM; |
| goto command_cleanup; |
| } |
| /* Set up the modified control endpoint 0 */ |
| xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx, |
| xhci->devs[slot_id]->out_ctx, ep_index); |
| |
| ep_ctx = xhci_get_ep_ctx(xhci, command->in_ctx, ep_index); |
| ep_ctx->ep_info2 &= cpu_to_le32(~MAX_PACKET_MASK); |
| ep_ctx->ep_info2 |= cpu_to_le32(MAX_PACKET(max_packet_size)); |
| |
| ctrl_ctx->add_flags = cpu_to_le32(EP0_FLAG); |
| ctrl_ctx->drop_flags = 0; |
| |
| xhci_dbg(xhci, "Slot %d input context\n", slot_id); |
| xhci_dbg_ctx(xhci, command->in_ctx, ep_index); |
| xhci_dbg(xhci, "Slot %d output context\n", slot_id); |
| xhci_dbg_ctx(xhci, out_ctx, ep_index); |
| |
| ret = xhci_configure_endpoint(xhci, urb->dev, command, |
| true, false); |
| |
| /* Clean up the input context for later use by bandwidth |
| * functions. |
| */ |
| ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG); |
| command_cleanup: |
| kfree(command->completion); |
| kfree(command); |
| } |
| return ret; |
| } |
| |
| /* |
| * non-error returns are a promise to giveback() the urb later |
| * we drop ownership so next owner (or urb unlink) can get it |
| */ |
| int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| struct xhci_td *buffer; |
| unsigned long flags; |
| int ret = 0; |
| unsigned int slot_id, ep_index; |
| struct urb_priv *urb_priv; |
| int size, i; |
| |
| if (!urb || xhci_check_args(hcd, urb->dev, urb->ep, |
| true, true, __func__) <= 0) |
| return -EINVAL; |
| |
| slot_id = urb->dev->slot_id; |
| ep_index = xhci_get_endpoint_index(&urb->ep->desc); |
| |
| if (!HCD_HW_ACCESSIBLE(hcd)) { |
| if (!in_interrupt()) |
| xhci_dbg(xhci, "urb submitted during PCI suspend\n"); |
| ret = -ESHUTDOWN; |
| goto exit; |
| } |
| |
| if (usb_endpoint_xfer_isoc(&urb->ep->desc)) |
| size = urb->number_of_packets; |
| else if (usb_endpoint_is_bulk_out(&urb->ep->desc) && |
| urb->transfer_buffer_length > 0 && |
| urb->transfer_flags & URB_ZERO_PACKET && |
| !(urb->transfer_buffer_length % usb_endpoint_maxp(&urb->ep->desc))) |
| size = 2; |
| else |
| size = 1; |
| |
| urb_priv = kzalloc(sizeof(struct urb_priv) + |
| size * sizeof(struct xhci_td *), mem_flags); |
| if (!urb_priv) |
| return -ENOMEM; |
| |
| buffer = kzalloc(size * sizeof(struct xhci_td), mem_flags); |
| if (!buffer) { |
| kfree(urb_priv); |
| return -ENOMEM; |
| } |
| |
| for (i = 0; i < size; i++) { |
| urb_priv->td[i] = buffer; |
| buffer++; |
| } |
| |
| urb_priv->length = size; |
| urb_priv->td_cnt = 0; |
| urb->hcpriv = urb_priv; |
| |
| if (usb_endpoint_xfer_control(&urb->ep->desc)) { |
| /* Check to see if the max packet size for the default control |
| * endpoint changed during FS device enumeration |
| */ |
| if (urb->dev->speed == USB_SPEED_FULL) { |
| ret = xhci_check_maxpacket(xhci, slot_id, |
| ep_index, urb); |
| if (ret < 0) { |
| xhci_urb_free_priv(urb_priv); |
| urb->hcpriv = NULL; |
| return ret; |
| } |
| } |
| |
| /* We have a spinlock and interrupts disabled, so we must pass |
| * atomic context to this function, which may allocate memory. |
| */ |
| spin_lock_irqsave(&xhci->lock, flags); |
| if (xhci->xhc_state & XHCI_STATE_DYING) |
| goto dying; |
| ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb, |
| slot_id, ep_index); |
| if (ret) |
| goto free_priv; |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| } else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) { |
| spin_lock_irqsave(&xhci->lock, flags); |
| if (xhci->xhc_state & XHCI_STATE_DYING) |
| goto dying; |
| if (xhci->devs[slot_id]->eps[ep_index].ep_state & |
| EP_GETTING_STREAMS) { |
| xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep " |
| "is transitioning to using streams.\n"); |
| ret = -EINVAL; |
| } else if (xhci->devs[slot_id]->eps[ep_index].ep_state & |
| EP_GETTING_NO_STREAMS) { |
| xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep " |
| "is transitioning to " |
| "not having streams.\n"); |
| ret = -EINVAL; |
| } else { |
| ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb, |
| slot_id, ep_index); |
| } |
| if (ret) |
| goto free_priv; |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| } else if (usb_endpoint_xfer_int(&urb->ep->desc)) { |
| spin_lock_irqsave(&xhci->lock, flags); |
| if (xhci->xhc_state & XHCI_STATE_DYING) |
| goto dying; |
| ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb, |
| slot_id, ep_index); |
| if (ret) |
| goto free_priv; |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| } else { |
| spin_lock_irqsave(&xhci->lock, flags); |
| if (xhci->xhc_state & XHCI_STATE_DYING) |
| goto dying; |
| ret = xhci_queue_isoc_tx_prepare(xhci, GFP_ATOMIC, urb, |
| slot_id, ep_index); |
| if (ret) |
| goto free_priv; |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| } |
| exit: |
| return ret; |
| dying: |
| xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for " |
| "non-responsive xHCI host.\n", |
| urb->ep->desc.bEndpointAddress, urb); |
| ret = -ESHUTDOWN; |
| free_priv: |
| xhci_urb_free_priv(urb_priv); |
| urb->hcpriv = NULL; |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return ret; |
| } |
| |
| /* Get the right ring for the given URB. |
| * If the endpoint supports streams, boundary check the URB's stream ID. |
| * If the endpoint doesn't support streams, return the singular endpoint ring. |
| */ |
| static struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci, |
| struct urb *urb) |
| { |
| unsigned int slot_id; |
| unsigned int ep_index; |
| unsigned int stream_id; |
| struct xhci_virt_ep *ep; |
| |
| slot_id = urb->dev->slot_id; |
| ep_index = xhci_get_endpoint_index(&urb->ep->desc); |
| stream_id = urb->stream_id; |
| ep = &xhci->devs[slot_id]->eps[ep_index]; |
| /* Common case: no streams */ |
| if (!(ep->ep_state & EP_HAS_STREAMS)) |
| return ep->ring; |
| |
| if (stream_id == 0) { |
| xhci_warn(xhci, |
| "WARN: Slot ID %u, ep index %u has streams, " |
| "but URB has no stream ID.\n", |
| slot_id, ep_index); |
| return NULL; |
| } |
| |
| if (stream_id < ep->stream_info->num_streams) |
| return ep->stream_info->stream_rings[stream_id]; |
| |
| xhci_warn(xhci, |
| "WARN: Slot ID %u, ep index %u has " |
| "stream IDs 1 to %u allocated, " |
| "but stream ID %u is requested.\n", |
| slot_id, ep_index, |
| ep->stream_info->num_streams - 1, |
| stream_id); |
| return NULL; |
| } |
| |
| /* |
| * Remove the URB's TD from the endpoint ring. This may cause the HC to stop |
| * USB transfers, potentially stopping in the middle of a TRB buffer. The HC |
| * should pick up where it left off in the TD, unless a Set Transfer Ring |
| * Dequeue Pointer is issued. |
| * |
| * The TRBs that make up the buffers for the canceled URB will be "removed" from |
| * the ring. Since the ring is a contiguous structure, they can't be physically |
| * removed. Instead, there are two options: |
| * |
| * 1) If the HC is in the middle of processing the URB to be canceled, we |
| * simply move the ring's dequeue pointer past those TRBs using the Set |
| * Transfer Ring Dequeue Pointer command. This will be the common case, |
| * when drivers timeout on the last submitted URB and attempt to cancel. |
| * |
| * 2) If the HC is in the middle of a different TD, we turn the TRBs into a |
| * series of 1-TRB transfer no-op TDs. (No-ops shouldn't be chained.) The |
| * HC will need to invalidate the any TRBs it has cached after the stop |
| * endpoint command, as noted in the xHCI 0.95 errata. |
| * |
| * 3) The TD may have completed by the time the Stop Endpoint Command |
| * completes, so software needs to handle that case too. |
| * |
| * This function should protect against the TD enqueueing code ringing the |
| * doorbell while this code is waiting for a Stop Endpoint command to complete. |
| * It also needs to account for multiple cancellations on happening at the same |
| * time for the same endpoint. |
| * |
| * Note that this function can be called in any context, or so says |
| * usb_hcd_unlink_urb() |
| */ |
| int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) |
| { |
| unsigned long flags; |
| int ret, i; |
| u32 temp; |
| struct xhci_hcd *xhci; |
| struct urb_priv *urb_priv; |
| struct xhci_td *td; |
| unsigned int ep_index; |
| struct xhci_ring *ep_ring; |
| struct xhci_virt_ep *ep; |
| struct xhci_command *command; |
| |
| xhci = hcd_to_xhci(hcd); |
| spin_lock_irqsave(&xhci->lock, flags); |
| /* Make sure the URB hasn't completed or been unlinked already */ |
| ret = usb_hcd_check_unlink_urb(hcd, urb, status); |
| if (ret || !urb->hcpriv) |
| goto done; |
| temp = readl(&xhci->op_regs->status); |
| if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_HALTED)) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "HW died, freeing TD."); |
| urb_priv = urb->hcpriv; |
| for (i = urb_priv->td_cnt; |
| i < urb_priv->length && xhci->devs[urb->dev->slot_id]; |
| i++) { |
| td = urb_priv->td[i]; |
| if (!list_empty(&td->td_list)) |
| list_del_init(&td->td_list); |
| if (!list_empty(&td->cancelled_td_list)) |
| list_del_init(&td->cancelled_td_list); |
| } |
| |
| usb_hcd_unlink_urb_from_ep(hcd, urb); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| usb_hcd_giveback_urb(hcd, urb, -ESHUTDOWN); |
| xhci_urb_free_priv(urb_priv); |
| return ret; |
| } |
| if ((xhci->xhc_state & XHCI_STATE_DYING) || |
| (xhci->xhc_state & XHCI_STATE_HALTED)) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Ep 0x%x: URB %p to be canceled on " |
| "non-responsive xHCI host.", |
| urb->ep->desc.bEndpointAddress, urb); |
| /* Let the stop endpoint command watchdog timer (which set this |
| * state) finish cleaning up the endpoint TD lists. We must |
| * have caught it in the middle of dropping a lock and giving |
| * back an URB. |
| */ |
| goto done; |
| } |
| |
| ep_index = xhci_get_endpoint_index(&urb->ep->desc); |
| ep = &xhci->devs[urb->dev->slot_id]->eps[ep_index]; |
| ep_ring = xhci_urb_to_transfer_ring(xhci, urb); |
| if (!ep_ring) { |
| ret = -EINVAL; |
| goto done; |
| } |
| |
| urb_priv = urb->hcpriv; |
| i = urb_priv->td_cnt; |
| if (i < urb_priv->length) |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Cancel URB %p, dev %s, ep 0x%x, " |
| "starting at offset 0x%llx", |
| urb, urb->dev->devpath, |
| urb->ep->desc.bEndpointAddress, |
| (unsigned long long) xhci_trb_virt_to_dma( |
| urb_priv->td[i]->start_seg, |
| urb_priv->td[i]->first_trb)); |
| |
| for (; i < urb_priv->length; i++) { |
| td = urb_priv->td[i]; |
| list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list); |
| } |
| |
| /* Queue a stop endpoint command, but only if this is |
| * the first cancellation to be handled. |
| */ |
| if (!(ep->ep_state & EP_HALT_PENDING)) { |
| command = xhci_alloc_command(xhci, false, false, GFP_ATOMIC); |
| if (!command) { |
| ret = -ENOMEM; |
| goto done; |
| } |
| ep->ep_state |= EP_HALT_PENDING; |
| ep->stop_cmds_pending++; |
| ep->stop_cmd_timer.expires = jiffies + |
| XHCI_STOP_EP_CMD_TIMEOUT * HZ; |
| add_timer(&ep->stop_cmd_timer); |
| xhci_queue_stop_endpoint(xhci, command, urb->dev->slot_id, |
| ep_index, 0); |
| xhci_ring_cmd_db(xhci); |
| } |
| done: |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return ret; |
| } |
| |
| /* Drop an endpoint from a new bandwidth configuration for this device. |
| * Only one call to this function is allowed per endpoint before |
| * check_bandwidth() or reset_bandwidth() must be called. |
| * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will |
| * add the endpoint to the schedule with possibly new parameters denoted by a |
| * different endpoint descriptor in usb_host_endpoint. |
| * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is |
| * not allowed. |
| * |
| * The USB core will not allow URBs to be queued to an endpoint that is being |
| * disabled, so there's no need for mutual exclusion to protect |
| * the xhci->devs[slot_id] structure. |
| */ |
| int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev, |
| struct usb_host_endpoint *ep) |
| { |
| struct xhci_hcd *xhci; |
| struct xhci_container_ctx *in_ctx, *out_ctx; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| unsigned int ep_index; |
| struct xhci_ep_ctx *ep_ctx; |
| u32 drop_flag; |
| u32 new_add_flags, new_drop_flags; |
| int ret; |
| |
| ret = xhci_check_args(hcd, udev, ep, 1, true, __func__); |
| if (ret <= 0) |
| return ret; |
| xhci = hcd_to_xhci(hcd); |
| if (xhci->xhc_state & XHCI_STATE_DYING) |
| return -ENODEV; |
| |
| xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev); |
| drop_flag = xhci_get_endpoint_flag(&ep->desc); |
| if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) { |
| xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n", |
| __func__, drop_flag); |
| return 0; |
| } |
| |
| in_ctx = xhci->devs[udev->slot_id]->in_ctx; |
| out_ctx = xhci->devs[udev->slot_id]->out_ctx; |
| ctrl_ctx = xhci_get_input_control_ctx(in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| return 0; |
| } |
| |
| ep_index = xhci_get_endpoint_index(&ep->desc); |
| ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index); |
| /* If the HC already knows the endpoint is disabled, |
| * or the HCD has noted it is disabled, ignore this request |
| */ |
| if (((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) == |
| cpu_to_le32(EP_STATE_DISABLED)) || |
| le32_to_cpu(ctrl_ctx->drop_flags) & |
| xhci_get_endpoint_flag(&ep->desc)) { |
| /* Do not warn when called after a usb_device_reset */ |
| if (xhci->devs[udev->slot_id]->eps[ep_index].ring != NULL) |
| xhci_warn(xhci, "xHCI %s called with disabled ep %p\n", |
| __func__, ep); |
| return 0; |
| } |
| |
| ctrl_ctx->drop_flags |= cpu_to_le32(drop_flag); |
| new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags); |
| |
| ctrl_ctx->add_flags &= cpu_to_le32(~drop_flag); |
| new_add_flags = le32_to_cpu(ctrl_ctx->add_flags); |
| |
| xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep); |
| |
| xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x\n", |
| (unsigned int) ep->desc.bEndpointAddress, |
| udev->slot_id, |
| (unsigned int) new_drop_flags, |
| (unsigned int) new_add_flags); |
| return 0; |
| } |
| |
| /* Add an endpoint to a new possible bandwidth configuration for this device. |
| * Only one call to this function is allowed per endpoint before |
| * check_bandwidth() or reset_bandwidth() must be called. |
| * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will |
| * add the endpoint to the schedule with possibly new parameters denoted by a |
| * different endpoint descriptor in usb_host_endpoint. |
| * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is |
| * not allowed. |
| * |
| * The USB core will not allow URBs to be queued to an endpoint until the |
| * configuration or alt setting is installed in the device, so there's no need |
| * for mutual exclusion to protect the xhci->devs[slot_id] structure. |
| */ |
| int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev, |
| struct usb_host_endpoint *ep) |
| { |
| struct xhci_hcd *xhci; |
| struct xhci_container_ctx *in_ctx; |
| unsigned int ep_index; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| u32 added_ctxs; |
| u32 new_add_flags, new_drop_flags; |
| struct xhci_virt_device *virt_dev; |
| int ret = 0; |
| |
| ret = xhci_check_args(hcd, udev, ep, 1, true, __func__); |
| if (ret <= 0) { |
| /* So we won't queue a reset ep command for a root hub */ |
| ep->hcpriv = NULL; |
| return ret; |
| } |
| xhci = hcd_to_xhci(hcd); |
| if (xhci->xhc_state & XHCI_STATE_DYING) |
| return -ENODEV; |
| |
| added_ctxs = xhci_get_endpoint_flag(&ep->desc); |
| if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) { |
| /* FIXME when we have to issue an evaluate endpoint command to |
| * deal with ep0 max packet size changing once we get the |
| * descriptors |
| */ |
| xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n", |
| __func__, added_ctxs); |
| return 0; |
| } |
| |
| virt_dev = xhci->devs[udev->slot_id]; |
| in_ctx = virt_dev->in_ctx; |
| ctrl_ctx = xhci_get_input_control_ctx(in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| return 0; |
| } |
| |
| ep_index = xhci_get_endpoint_index(&ep->desc); |
| /* If this endpoint is already in use, and the upper layers are trying |
| * to add it again without dropping it, reject the addition. |
| */ |
| if (virt_dev->eps[ep_index].ring && |
| !(le32_to_cpu(ctrl_ctx->drop_flags) & added_ctxs)) { |
| xhci_warn(xhci, "Trying to add endpoint 0x%x " |
| "without dropping it.\n", |
| (unsigned int) ep->desc.bEndpointAddress); |
| return -EINVAL; |
| } |
| |
| /* If the HCD has already noted the endpoint is enabled, |
| * ignore this request. |
| */ |
| if (le32_to_cpu(ctrl_ctx->add_flags) & added_ctxs) { |
| xhci_warn(xhci, "xHCI %s called with enabled ep %p\n", |
| __func__, ep); |
| return 0; |
| } |
| |
| /* |
| * Configuration and alternate setting changes must be done in |
| * process context, not interrupt context (or so documenation |
| * for usb_set_interface() and usb_set_configuration() claim). |
| */ |
| if (xhci_endpoint_init(xhci, virt_dev, udev, ep, GFP_NOIO) < 0) { |
| dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n", |
| __func__, ep->desc.bEndpointAddress); |
| return -ENOMEM; |
| } |
| |
| ctrl_ctx->add_flags |= cpu_to_le32(added_ctxs); |
| new_add_flags = le32_to_cpu(ctrl_ctx->add_flags); |
| |
| /* If xhci_endpoint_disable() was called for this endpoint, but the |
| * xHC hasn't been notified yet through the check_bandwidth() call, |
| * this re-adds a new state for the endpoint from the new endpoint |
| * descriptors. We must drop and re-add this endpoint, so we leave the |
| * drop flags alone. |
| */ |
| new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags); |
| |
| /* Store the usb_device pointer for later use */ |
| ep->hcpriv = udev; |
| |
| xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x\n", |
| (unsigned int) ep->desc.bEndpointAddress, |
| udev->slot_id, |
| (unsigned int) new_drop_flags, |
| (unsigned int) new_add_flags); |
| return 0; |
| } |
| |
| static void xhci_zero_in_ctx(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev) |
| { |
| struct xhci_input_control_ctx *ctrl_ctx; |
| struct xhci_ep_ctx *ep_ctx; |
| struct xhci_slot_ctx *slot_ctx; |
| int i; |
| |
| ctrl_ctx = xhci_get_input_control_ctx(virt_dev->in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| return; |
| } |
| |
| /* When a device's add flag and drop flag are zero, any subsequent |
| * configure endpoint command will leave that endpoint's state |
| * untouched. Make sure we don't leave any old state in the input |
| * endpoint contexts. |
| */ |
| ctrl_ctx->drop_flags = 0; |
| ctrl_ctx->add_flags = 0; |
| slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx); |
| slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK); |
| /* Endpoint 0 is always valid */ |
| slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1)); |
| for (i = 1; i < 31; ++i) { |
| ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, i); |
| ep_ctx->ep_info = 0; |
| ep_ctx->ep_info2 = 0; |
| ep_ctx->deq = 0; |
| ep_ctx->tx_info = 0; |
| } |
| } |
| |
| static int xhci_configure_endpoint_result(struct xhci_hcd *xhci, |
| struct usb_device *udev, u32 *cmd_status) |
| { |
| int ret; |
| |
| switch (*cmd_status) { |
| case COMP_CMD_ABORT: |
| case COMP_CMD_STOP: |
| xhci_warn(xhci, "Timeout while waiting for configure endpoint command\n"); |
| ret = -ETIME; |
| break; |
| case COMP_ENOMEM: |
| dev_warn(&udev->dev, |
| "Not enough host controller resources for new device state.\n"); |
| ret = -ENOMEM; |
| /* FIXME: can we allocate more resources for the HC? */ |
| break; |
| case COMP_BW_ERR: |
| case COMP_2ND_BW_ERR: |
| dev_warn(&udev->dev, |
| "Not enough bandwidth for new device state.\n"); |
| ret = -ENOSPC; |
| /* FIXME: can we go back to the old state? */ |
| break; |
| case COMP_TRB_ERR: |
| /* the HCD set up something wrong */ |
| dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, " |
| "add flag = 1, " |
| "and endpoint is not disabled.\n"); |
| ret = -EINVAL; |
| break; |
| case COMP_DEV_ERR: |
| dev_warn(&udev->dev, |
| "ERROR: Incompatible device for endpoint configure command.\n"); |
| ret = -ENODEV; |
| break; |
| case COMP_SUCCESS: |
| xhci_dbg_trace(xhci, trace_xhci_dbg_context_change, |
| "Successful Endpoint Configure command"); |
| ret = 0; |
| break; |
| default: |
| xhci_err(xhci, "ERROR: unexpected command completion code 0x%x.\n", |
| *cmd_status); |
| ret = -EINVAL; |
| break; |
| } |
| return ret; |
| } |
| |
| static int xhci_evaluate_context_result(struct xhci_hcd *xhci, |
| struct usb_device *udev, u32 *cmd_status) |
| { |
| int ret; |
| struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id]; |
| |
| switch (*cmd_status) { |
| case COMP_CMD_ABORT: |
| case COMP_CMD_STOP: |
| xhci_warn(xhci, "Timeout while waiting for evaluate context command\n"); |
| ret = -ETIME; |
| break; |
| case COMP_EINVAL: |
| dev_warn(&udev->dev, |
| "WARN: xHCI driver setup invalid evaluate context command.\n"); |
| ret = -EINVAL; |
| break; |
| case COMP_EBADSLT: |
| dev_warn(&udev->dev, |
| "WARN: slot not enabled for evaluate context command.\n"); |
| ret = -EINVAL; |
| break; |
| case COMP_CTX_STATE: |
| dev_warn(&udev->dev, |
| "WARN: invalid context state for evaluate context command.\n"); |
| xhci_dbg_ctx(xhci, virt_dev->out_ctx, 1); |
| ret = -EINVAL; |
| break; |
| case COMP_DEV_ERR: |
| dev_warn(&udev->dev, |
| "ERROR: Incompatible device for evaluate context command.\n"); |
| ret = -ENODEV; |
| break; |
| case COMP_MEL_ERR: |
| /* Max Exit Latency too large error */ |
| dev_warn(&udev->dev, "WARN: Max Exit Latency too large\n"); |
| ret = -EINVAL; |
| break; |
| case COMP_SUCCESS: |
| xhci_dbg_trace(xhci, trace_xhci_dbg_context_change, |
| "Successful evaluate context command"); |
| ret = 0; |
| break; |
| default: |
| xhci_err(xhci, "ERROR: unexpected command completion code 0x%x.\n", |
| *cmd_status); |
| ret = -EINVAL; |
| break; |
| } |
| return ret; |
| } |
| |
| static u32 xhci_count_num_new_endpoints(struct xhci_hcd *xhci, |
| struct xhci_input_control_ctx *ctrl_ctx) |
| { |
| u32 valid_add_flags; |
| u32 valid_drop_flags; |
| |
| /* Ignore the slot flag (bit 0), and the default control endpoint flag |
| * (bit 1). The default control endpoint is added during the Address |
| * Device command and is never removed until the slot is disabled. |
| */ |
| valid_add_flags = le32_to_cpu(ctrl_ctx->add_flags) >> 2; |
| valid_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags) >> 2; |
| |
| /* Use hweight32 to count the number of ones in the add flags, or |
| * number of endpoints added. Don't count endpoints that are changed |
| * (both added and dropped). |
| */ |
| return hweight32(valid_add_flags) - |
| hweight32(valid_add_flags & valid_drop_flags); |
| } |
| |
| static unsigned int xhci_count_num_dropped_endpoints(struct xhci_hcd *xhci, |
| struct xhci_input_control_ctx *ctrl_ctx) |
| { |
| u32 valid_add_flags; |
| u32 valid_drop_flags; |
| |
| valid_add_flags = le32_to_cpu(ctrl_ctx->add_flags) >> 2; |
| valid_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags) >> 2; |
| |
| return hweight32(valid_drop_flags) - |
| hweight32(valid_add_flags & valid_drop_flags); |
| } |
| |
| /* |
| * We need to reserve the new number of endpoints before the configure endpoint |
| * command completes. We can't subtract the dropped endpoints from the number |
| * of active endpoints until the command completes because we can oversubscribe |
| * the host in this case: |
| * |
| * - the first configure endpoint command drops more endpoints than it adds |
| * - a second configure endpoint command that adds more endpoints is queued |
| * - the first configure endpoint command fails, so the config is unchanged |
| * - the second command may succeed, even though there isn't enough resources |
| * |
| * Must be called with xhci->lock held. |
| */ |
| static int xhci_reserve_host_resources(struct xhci_hcd *xhci, |
| struct xhci_input_control_ctx *ctrl_ctx) |
| { |
| u32 added_eps; |
| |
| added_eps = xhci_count_num_new_endpoints(xhci, ctrl_ctx); |
| if (xhci->num_active_eps + added_eps > xhci->limit_active_eps) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Not enough ep ctxs: " |
| "%u active, need to add %u, limit is %u.", |
| xhci->num_active_eps, added_eps, |
| xhci->limit_active_eps); |
| return -ENOMEM; |
| } |
| xhci->num_active_eps += added_eps; |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Adding %u ep ctxs, %u now active.", added_eps, |
| xhci->num_active_eps); |
| return 0; |
| } |
| |
| /* |
| * The configure endpoint was failed by the xHC for some other reason, so we |
| * need to revert the resources that failed configuration would have used. |
| * |
| * Must be called with xhci->lock held. |
| */ |
| static void xhci_free_host_resources(struct xhci_hcd *xhci, |
| struct xhci_input_control_ctx *ctrl_ctx) |
| { |
| u32 num_failed_eps; |
| |
| num_failed_eps = xhci_count_num_new_endpoints(xhci, ctrl_ctx); |
| xhci->num_active_eps -= num_failed_eps; |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Removing %u failed ep ctxs, %u now active.", |
| num_failed_eps, |
| xhci->num_active_eps); |
| } |
| |
| /* |
| * Now that the command has completed, clean up the active endpoint count by |
| * subtracting out the endpoints that were dropped (but not changed). |
| * |
| * Must be called with xhci->lock held. |
| */ |
| static void xhci_finish_resource_reservation(struct xhci_hcd *xhci, |
| struct xhci_input_control_ctx *ctrl_ctx) |
| { |
| u32 num_dropped_eps; |
| |
| num_dropped_eps = xhci_count_num_dropped_endpoints(xhci, ctrl_ctx); |
| xhci->num_active_eps -= num_dropped_eps; |
| if (num_dropped_eps) |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Removing %u dropped ep ctxs, %u now active.", |
| num_dropped_eps, |
| xhci->num_active_eps); |
| } |
| |
| static unsigned int xhci_get_block_size(struct usb_device *udev) |
| { |
| switch (udev->speed) { |
| case USB_SPEED_LOW: |
| case USB_SPEED_FULL: |
| return FS_BLOCK; |
| case USB_SPEED_HIGH: |
| return HS_BLOCK; |
| case USB_SPEED_SUPER: |
| case USB_SPEED_SUPER_PLUS: |
| return SS_BLOCK; |
| case USB_SPEED_UNKNOWN: |
| case USB_SPEED_WIRELESS: |
| default: |
| /* Should never happen */ |
| return 1; |
| } |
| } |
| |
| static unsigned int |
| xhci_get_largest_overhead(struct xhci_interval_bw *interval_bw) |
| { |
| if (interval_bw->overhead[LS_OVERHEAD_TYPE]) |
| return LS_OVERHEAD; |
| if (interval_bw->overhead[FS_OVERHEAD_TYPE]) |
| return FS_OVERHEAD; |
| return HS_OVERHEAD; |
| } |
| |
| /* If we are changing a LS/FS device under a HS hub, |
| * make sure (if we are activating a new TT) that the HS bus has enough |
| * bandwidth for this new TT. |
| */ |
| static int xhci_check_tt_bw_table(struct xhci_hcd *xhci, |
| struct xhci_virt_device *virt_dev, |
| int old_active_eps) |
| { |
| struct xhci_interval_bw_table *bw_table; |
| struct xhci_tt_bw_info *tt_info; |
| |
| /* Find the bandwidth table for the root port this TT is attached to. */ |
| bw_table = &xhci->rh_bw[virt_dev->real_port - 1].bw_table; |
| tt_info = virt_dev->tt_info; |
| /* If this TT already had active endpoints, the bandwidth for this TT |
| * has already been added. Removing all periodic endpoints (and thus |
| * making the TT enactive) will only decrease the bandwidth used. |
| */ |
| if (old_active_eps) |
| return 0; |
| if (old_active_eps == 0 && tt_info->active_eps != 0) { |
| if (bw_table->bw_used + TT_HS_OVERHEAD > HS_BW_LIMIT) |
| return -ENOMEM; |
| return 0; |
| } |
| /* Not sure why we would have no new active endpoints... |
| * |
| * Maybe because of an Evaluate Context change for a hub update or a |
| * control endpoint 0 max packet size change? |
| * FIXME: skip the bandwidth calculation in that case. |
| */ |
| return 0; |
| } |
| |
| static int xhci_check_ss_bw(struct xhci_hcd *xhci, |
| struct xhci_virt_device *virt_dev) |
| { |
| unsigned int bw_reserved; |
| |
| bw_reserved = DIV_ROUND_UP(SS_BW_RESERVED*SS_BW_LIMIT_IN, 100); |
| if (virt_dev->bw_table->ss_bw_in > (SS_BW_LIMIT_IN - bw_reserved)) |
| return -ENOMEM; |
| |
| bw_reserved = DIV_ROUND_UP(SS_BW_RESERVED*SS_BW_LIMIT_OUT, 100); |
| if (virt_dev->bw_table->ss_bw_out > (SS_BW_LIMIT_OUT - bw_reserved)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| /* |
| * This algorithm is a very conservative estimate of the worst-case scheduling |
| * scenario for any one interval. The hardware dynamically schedules the |
| * packets, so we can't tell which microframe could be the limiting factor in |
| * the bandwidth scheduling. This only takes into account periodic endpoints. |
| * |
| * Obviously, we can't solve an NP complete problem to find the minimum worst |
| * case scenario. Instead, we come up with an estimate that is no less than |
| * the worst case bandwidth used for any one microframe, but may be an |
| * over-estimate. |
| * |
| * We walk the requirements for each endpoint by interval, starting with the |
| * smallest interval, and place packets in the schedule where there is only one |
| * possible way to schedule packets for that interval. In order to simplify |
| * this algorithm, we record the largest max packet size for each interval, and |
| * assume all packets will be that size. |
| * |
| * For interval 0, we obviously must schedule all packets for each interval. |
| * The bandwidth for interval 0 is just the amount of data to be transmitted |
| * (the sum of all max ESIT payload sizes, plus any overhead per packet times |
| * the number of packets). |
| * |
| * For interval 1, we have two possible microframes to schedule those packets |
| * in. For this algorithm, if we can schedule the same number of packets for |
| * each possible scheduling opportunity (each microframe), we will do so. The |
| * remaining number of packets will be saved to be transmitted in the gaps in |
| * the next interval's scheduling sequence. |
| * |
| * As we move those remaining packets to be scheduled with interval 2 packets, |
| * we have to double the number of remaining packets to transmit. This is |
| * because the intervals are actually powers of 2, and we would be transmitting |
| * the previous interval's packets twice in this interval. We also have to be |
| * sure that when we look at the largest max packet size for this interval, we |
| * also look at the largest max packet size for the remaining packets and take |
| * the greater of the two. |
| * |
| * The algorithm continues to evenly distribute packets in each scheduling |
| * opportunity, and push the remaining packets out, until we get to the last |
| * interval. Then those packets and their associated overhead are just added |
| * to the bandwidth used. |
| */ |
| static int xhci_check_bw_table(struct xhci_hcd *xhci, |
| struct xhci_virt_device *virt_dev, |
| int old_active_eps) |
| { |
| unsigned int bw_reserved; |
| unsigned int max_bandwidth; |
| unsigned int bw_used; |
| unsigned int block_size; |
| struct xhci_interval_bw_table *bw_table; |
| unsigned int packet_size = 0; |
| unsigned int overhead = 0; |
| unsigned int packets_transmitted = 0; |
| unsigned int packets_remaining = 0; |
| unsigned int i; |
| |
| if (virt_dev->udev->speed >= USB_SPEED_SUPER) |
| return xhci_check_ss_bw(xhci, virt_dev); |
| |
| if (virt_dev->udev->speed == USB_SPEED_HIGH) { |
| max_bandwidth = HS_BW_LIMIT; |
| /* Convert percent of bus BW reserved to blocks reserved */ |
| bw_reserved = DIV_ROUND_UP(HS_BW_RESERVED * max_bandwidth, 100); |
| } else { |
| max_bandwidth = FS_BW_LIMIT; |
| bw_reserved = DIV_ROUND_UP(FS_BW_RESERVED * max_bandwidth, 100); |
| } |
| |
| bw_table = virt_dev->bw_table; |
| /* We need to translate the max packet size and max ESIT payloads into |
| * the units the hardware uses. |
| */ |
| block_size = xhci_get_block_size(virt_dev->udev); |
| |
| /* If we are manipulating a LS/FS device under a HS hub, double check |
| * that the HS bus has enough bandwidth if we are activing a new TT. |
| */ |
| if (virt_dev->tt_info) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Recalculating BW for rootport %u", |
| virt_dev->real_port); |
| if (xhci_check_tt_bw_table(xhci, virt_dev, old_active_eps)) { |
| xhci_warn(xhci, "Not enough bandwidth on HS bus for " |
| "newly activated TT.\n"); |
| return -ENOMEM; |
| } |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Recalculating BW for TT slot %u port %u", |
| virt_dev->tt_info->slot_id, |
| virt_dev->tt_info->ttport); |
| } else { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Recalculating BW for rootport %u", |
| virt_dev->real_port); |
| } |
| |
| /* Add in how much bandwidth will be used for interval zero, or the |
| * rounded max ESIT payload + number of packets * largest overhead. |
| */ |
| bw_used = DIV_ROUND_UP(bw_table->interval0_esit_payload, block_size) + |
| bw_table->interval_bw[0].num_packets * |
| xhci_get_largest_overhead(&bw_table->interval_bw[0]); |
| |
| for (i = 1; i < XHCI_MAX_INTERVAL; i++) { |
| unsigned int bw_added; |
| unsigned int largest_mps; |
| unsigned int interval_overhead; |
| |
| /* |
| * How many packets could we transmit in this interval? |
| * If packets didn't fit in the previous interval, we will need |
| * to transmit that many packets twice within this interval. |
| */ |
| packets_remaining = 2 * packets_remaining + |
| bw_table->interval_bw[i].num_packets; |
| |
| /* Find the largest max packet size of this or the previous |
| * interval. |
| */ |
| if (list_empty(&bw_table->interval_bw[i].endpoints)) |
| largest_mps = 0; |
| else { |
| struct xhci_virt_ep *virt_ep; |
| struct list_head *ep_entry; |
| |
| ep_entry = bw_table->interval_bw[i].endpoints.next; |
| virt_ep = list_entry(ep_entry, |
| struct xhci_virt_ep, bw_endpoint_list); |
| /* Convert to blocks, rounding up */ |
| largest_mps = DIV_ROUND_UP( |
| virt_ep->bw_info.max_packet_size, |
| block_size); |
| } |
| if (largest_mps > packet_size) |
| packet_size = largest_mps; |
| |
| /* Use the larger overhead of this or the previous interval. */ |
| interval_overhead = xhci_get_largest_overhead( |
| &bw_table->interval_bw[i]); |
| if (interval_overhead > overhead) |
| overhead = interval_overhead; |
| |
| /* How many packets can we evenly distribute across |
| * (1 << (i + 1)) possible scheduling opportunities? |
| */ |
| packets_transmitted = packets_remaining >> (i + 1); |
| |
| /* Add in the bandwidth used for those scheduled packets */ |
| bw_added = packets_transmitted * (overhead + packet_size); |
| |
| /* How many packets do we have remaining to transmit? */ |
| packets_remaining = packets_remaining % (1 << (i + 1)); |
| |
| /* What largest max packet size should those packets have? */ |
| /* If we've transmitted all packets, don't carry over the |
| * largest packet size. |
| */ |
| if (packets_remaining == 0) { |
| packet_size = 0; |
| overhead = 0; |
| } else if (packets_transmitted > 0) { |
| /* Otherwise if we do have remaining packets, and we've |
| * scheduled some packets in this interval, take the |
| * largest max packet size from endpoints with this |
| * interval. |
| */ |
| packet_size = largest_mps; |
| overhead = interval_overhead; |
| } |
| /* Otherwise carry over packet_size and overhead from the last |
| * time we had a remainder. |
| */ |
| bw_used += bw_added; |
| if (bw_used > max_bandwidth) { |
| xhci_warn(xhci, "Not enough bandwidth. " |
| "Proposed: %u, Max: %u\n", |
| bw_used, max_bandwidth); |
| return -ENOMEM; |
| } |
| } |
| /* |
| * Ok, we know we have some packets left over after even-handedly |
| * scheduling interval 15. We don't know which microframes they will |
| * fit into, so we over-schedule and say they will be scheduled every |
| * microframe. |
| */ |
| if (packets_remaining > 0) |
| bw_used += overhead + packet_size; |
| |
| if (!virt_dev->tt_info && virt_dev->udev->speed == USB_SPEED_HIGH) { |
| unsigned int port_index = virt_dev->real_port - 1; |
| |
| /* OK, we're manipulating a HS device attached to a |
| * root port bandwidth domain. Include the number of active TTs |
| * in the bandwidth used. |
| */ |
| bw_used += TT_HS_OVERHEAD * |
| xhci->rh_bw[port_index].num_active_tts; |
| } |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Final bandwidth: %u, Limit: %u, Reserved: %u, " |
| "Available: %u " "percent", |
| bw_used, max_bandwidth, bw_reserved, |
| (max_bandwidth - bw_used - bw_reserved) * 100 / |
| max_bandwidth); |
| |
| bw_used += bw_reserved; |
| if (bw_used > max_bandwidth) { |
| xhci_warn(xhci, "Not enough bandwidth. Proposed: %u, Max: %u\n", |
| bw_used, max_bandwidth); |
| return -ENOMEM; |
| } |
| |
| bw_table->bw_used = bw_used; |
| return 0; |
| } |
| |
| static bool xhci_is_async_ep(unsigned int ep_type) |
| { |
| return (ep_type != ISOC_OUT_EP && ep_type != INT_OUT_EP && |
| ep_type != ISOC_IN_EP && |
| ep_type != INT_IN_EP); |
| } |
| |
| static bool xhci_is_sync_in_ep(unsigned int ep_type) |
| { |
| return (ep_type == ISOC_IN_EP || ep_type == INT_IN_EP); |
| } |
| |
| static unsigned int xhci_get_ss_bw_consumed(struct xhci_bw_info *ep_bw) |
| { |
| unsigned int mps = DIV_ROUND_UP(ep_bw->max_packet_size, SS_BLOCK); |
| |
| if (ep_bw->ep_interval == 0) |
| return SS_OVERHEAD_BURST + |
| (ep_bw->mult * ep_bw->num_packets * |
| (SS_OVERHEAD + mps)); |
| return DIV_ROUND_UP(ep_bw->mult * ep_bw->num_packets * |
| (SS_OVERHEAD + mps + SS_OVERHEAD_BURST), |
| 1 << ep_bw->ep_interval); |
| |
| } |
| |
| void xhci_drop_ep_from_interval_table(struct xhci_hcd *xhci, |
| struct xhci_bw_info *ep_bw, |
| struct xhci_interval_bw_table *bw_table, |
| struct usb_device *udev, |
| struct xhci_virt_ep *virt_ep, |
| struct xhci_tt_bw_info *tt_info) |
| { |
| struct xhci_interval_bw *interval_bw; |
| int normalized_interval; |
| |
| if (xhci_is_async_ep(ep_bw->type)) |
| return; |
| |
| if (udev->speed >= USB_SPEED_SUPER) { |
| if (xhci_is_sync_in_ep(ep_bw->type)) |
| xhci->devs[udev->slot_id]->bw_table->ss_bw_in -= |
| xhci_get_ss_bw_consumed(ep_bw); |
| else |
| xhci->devs[udev->slot_id]->bw_table->ss_bw_out -= |
| xhci_get_ss_bw_consumed(ep_bw); |
| return; |
| } |
| |
| /* SuperSpeed endpoints never get added to intervals in the table, so |
| * this check is only valid for HS/FS/LS devices. |
| */ |
| if (list_empty(&virt_ep->bw_endpoint_list)) |
| return; |
| /* For LS/FS devices, we need to translate the interval expressed in |
| * microframes to frames. |
| */ |
| if (udev->speed == USB_SPEED_HIGH) |
| normalized_interval = ep_bw->ep_interval; |
| else |
| normalized_interval = ep_bw->ep_interval - 3; |
| |
| if (normalized_interval == 0) |
| bw_table->interval0_esit_payload -= ep_bw->max_esit_payload; |
| interval_bw = &bw_table->interval_bw[normalized_interval]; |
| interval_bw->num_packets -= ep_bw->num_packets; |
| switch (udev->speed) { |
| case USB_SPEED_LOW: |
| interval_bw->overhead[LS_OVERHEAD_TYPE] -= 1; |
| break; |
| case USB_SPEED_FULL: |
| interval_bw->overhead[FS_OVERHEAD_TYPE] -= 1; |
| break; |
| case USB_SPEED_HIGH: |
| interval_bw->overhead[HS_OVERHEAD_TYPE] -= 1; |
| break; |
| case USB_SPEED_SUPER: |
| case USB_SPEED_SUPER_PLUS: |
| case USB_SPEED_UNKNOWN: |
| case USB_SPEED_WIRELESS: |
| /* Should never happen because only LS/FS/HS endpoints will get |
| * added to the endpoint list. |
| */ |
| return; |
| } |
| if (tt_info) |
| tt_info->active_eps -= 1; |
| list_del_init(&virt_ep->bw_endpoint_list); |
| } |
| |
| static void xhci_add_ep_to_interval_table(struct xhci_hcd *xhci, |
| struct xhci_bw_info *ep_bw, |
| struct xhci_interval_bw_table *bw_table, |
| struct usb_device *udev, |
| struct xhci_virt_ep *virt_ep, |
| struct xhci_tt_bw_info *tt_info) |
| { |
| struct xhci_interval_bw *interval_bw; |
| struct xhci_virt_ep *smaller_ep; |
| int normalized_interval; |
| |
| if (xhci_is_async_ep(ep_bw->type)) |
| return; |
| |
| if (udev->speed == USB_SPEED_SUPER) { |
| if (xhci_is_sync_in_ep(ep_bw->type)) |
| xhci->devs[udev->slot_id]->bw_table->ss_bw_in += |
| xhci_get_ss_bw_consumed(ep_bw); |
| else |
| xhci->devs[udev->slot_id]->bw_table->ss_bw_out += |
| xhci_get_ss_bw_consumed(ep_bw); |
| return; |
| } |
| |
| /* For LS/FS devices, we need to translate the interval expressed in |
| * microframes to frames. |
| */ |
| if (udev->speed == USB_SPEED_HIGH) |
| normalized_interval = ep_bw->ep_interval; |
| else |
| normalized_interval = ep_bw->ep_interval - 3; |
| |
| if (normalized_interval == 0) |
| bw_table->interval0_esit_payload += ep_bw->max_esit_payload; |
| interval_bw = &bw_table->interval_bw[normalized_interval]; |
| interval_bw->num_packets += ep_bw->num_packets; |
| switch (udev->speed) { |
| case USB_SPEED_LOW: |
| interval_bw->overhead[LS_OVERHEAD_TYPE] += 1; |
| break; |
| case USB_SPEED_FULL: |
| interval_bw->overhead[FS_OVERHEAD_TYPE] += 1; |
| break; |
| case USB_SPEED_HIGH: |
| interval_bw->overhead[HS_OVERHEAD_TYPE] += 1; |
| break; |
| case USB_SPEED_SUPER: |
| case USB_SPEED_SUPER_PLUS: |
| case USB_SPEED_UNKNOWN: |
| case USB_SPEED_WIRELESS: |
| /* Should never happen because only LS/FS/HS endpoints will get |
| * added to the endpoint list. |
| */ |
| return; |
| } |
| |
| if (tt_info) |
| tt_info->active_eps += 1; |
| /* Insert the endpoint into the list, largest max packet size first. */ |
| list_for_each_entry(smaller_ep, &interval_bw->endpoints, |
| bw_endpoint_list) { |
| if (ep_bw->max_packet_size >= |
| smaller_ep->bw_info.max_packet_size) { |
| /* Add the new ep before the smaller endpoint */ |
| list_add_tail(&virt_ep->bw_endpoint_list, |
| &smaller_ep->bw_endpoint_list); |
| return; |
| } |
| } |
| /* Add the new endpoint at the end of the list. */ |
| list_add_tail(&virt_ep->bw_endpoint_list, |
| &interval_bw->endpoints); |
| } |
| |
| void xhci_update_tt_active_eps(struct xhci_hcd *xhci, |
| struct xhci_virt_device *virt_dev, |
| int old_active_eps) |
| { |
| struct xhci_root_port_bw_info *rh_bw_info; |
| if (!virt_dev->tt_info) |
| return; |
| |
| rh_bw_info = &xhci->rh_bw[virt_dev->real_port - 1]; |
| if (old_active_eps == 0 && |
| virt_dev->tt_info->active_eps != 0) { |
| rh_bw_info->num_active_tts += 1; |
| rh_bw_info->bw_table.bw_used += TT_HS_OVERHEAD; |
| } else if (old_active_eps != 0 && |
| virt_dev->tt_info->active_eps == 0) { |
| rh_bw_info->num_active_tts -= 1; |
| rh_bw_info->bw_table.bw_used -= TT_HS_OVERHEAD; |
| } |
| } |
| |
| static int xhci_reserve_bandwidth(struct xhci_hcd *xhci, |
| struct xhci_virt_device *virt_dev, |
| struct xhci_container_ctx *in_ctx) |
| { |
| struct xhci_bw_info ep_bw_info[31]; |
| int i; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| int old_active_eps = 0; |
| |
| if (virt_dev->tt_info) |
| old_active_eps = virt_dev->tt_info->active_eps; |
| |
| ctrl_ctx = xhci_get_input_control_ctx(in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| return -ENOMEM; |
| } |
| |
| for (i = 0; i < 31; i++) { |
| if (!EP_IS_ADDED(ctrl_ctx, i) && !EP_IS_DROPPED(ctrl_ctx, i)) |
| continue; |
| |
| /* Make a copy of the BW info in case we need to revert this */ |
| memcpy(&ep_bw_info[i], &virt_dev->eps[i].bw_info, |
| sizeof(ep_bw_info[i])); |
| /* Drop the endpoint from the interval table if the endpoint is |
| * being dropped or changed. |
| */ |
| if (EP_IS_DROPPED(ctrl_ctx, i)) |
| xhci_drop_ep_from_interval_table(xhci, |
| &virt_dev->eps[i].bw_info, |
| virt_dev->bw_table, |
| virt_dev->udev, |
| &virt_dev->eps[i], |
| virt_dev->tt_info); |
| } |
| /* Overwrite the information stored in the endpoints' bw_info */ |
| xhci_update_bw_info(xhci, virt_dev->in_ctx, ctrl_ctx, virt_dev); |
| for (i = 0; i < 31; i++) { |
| /* Add any changed or added endpoints to the interval table */ |
| if (EP_IS_ADDED(ctrl_ctx, i)) |
| xhci_add_ep_to_interval_table(xhci, |
| &virt_dev->eps[i].bw_info, |
| virt_dev->bw_table, |
| virt_dev->udev, |
| &virt_dev->eps[i], |
| virt_dev->tt_info); |
| } |
| |
| if (!xhci_check_bw_table(xhci, virt_dev, old_active_eps)) { |
| /* Ok, this fits in the bandwidth we have. |
| * Update the number of active TTs. |
| */ |
| xhci_update_tt_active_eps(xhci, virt_dev, old_active_eps); |
| return 0; |
| } |
| |
| /* We don't have enough bandwidth for this, revert the stored info. */ |
| for (i = 0; i < 31; i++) { |
| if (!EP_IS_ADDED(ctrl_ctx, i) && !EP_IS_DROPPED(ctrl_ctx, i)) |
| continue; |
| |
| /* Drop the new copies of any added or changed endpoints from |
| * the interval table. |
| */ |
| if (EP_IS_ADDED(ctrl_ctx, i)) { |
| xhci_drop_ep_from_interval_table(xhci, |
| &virt_dev->eps[i].bw_info, |
| virt_dev->bw_table, |
| virt_dev->udev, |
| &virt_dev->eps[i], |
| virt_dev->tt_info); |
| } |
| /* Revert the endpoint back to its old information */ |
| memcpy(&virt_dev->eps[i].bw_info, &ep_bw_info[i], |
| sizeof(ep_bw_info[i])); |
| /* Add any changed or dropped endpoints back into the table */ |
| if (EP_IS_DROPPED(ctrl_ctx, i)) |
| xhci_add_ep_to_interval_table(xhci, |
| &virt_dev->eps[i].bw_info, |
| virt_dev->bw_table, |
| virt_dev->udev, |
| &virt_dev->eps[i], |
| virt_dev->tt_info); |
| } |
| return -ENOMEM; |
| } |
| |
| |
| /* Issue a configure endpoint command or evaluate context command |
| * and wait for it to finish. |
| */ |
| static int xhci_configure_endpoint(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| struct xhci_command *command, |
| bool ctx_change, bool must_succeed) |
| { |
| int ret; |
| unsigned long flags; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| struct xhci_virt_device *virt_dev; |
| |
| if (!command) |
| return -EINVAL; |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| virt_dev = xhci->devs[udev->slot_id]; |
| |
| ctrl_ctx = xhci_get_input_control_ctx(command->in_ctx); |
| if (!ctrl_ctx) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| return -ENOMEM; |
| } |
| |
| if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK) && |
| xhci_reserve_host_resources(xhci, ctrl_ctx)) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_warn(xhci, "Not enough host resources, " |
| "active endpoint contexts = %u\n", |
| xhci->num_active_eps); |
| return -ENOMEM; |
| } |
| if ((xhci->quirks & XHCI_SW_BW_CHECKING) && |
| xhci_reserve_bandwidth(xhci, virt_dev, command->in_ctx)) { |
| if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) |
| xhci_free_host_resources(xhci, ctrl_ctx); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_warn(xhci, "Not enough bandwidth\n"); |
| return -ENOMEM; |
| } |
| |
| if (!ctx_change) |
| ret = xhci_queue_configure_endpoint(xhci, command, |
| command->in_ctx->dma, |
| udev->slot_id, must_succeed); |
| else |
| ret = xhci_queue_evaluate_context(xhci, command, |
| command->in_ctx->dma, |
| udev->slot_id, must_succeed); |
| if (ret < 0) { |
| if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) |
| xhci_free_host_resources(xhci, ctrl_ctx); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_context_change, |
| "FIXME allocate a new ring segment"); |
| return -ENOMEM; |
| } |
| xhci_ring_cmd_db(xhci); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| /* Wait for the configure endpoint command to complete */ |
| wait_for_completion(command->completion); |
| |
| if (!ctx_change) |
| ret = xhci_configure_endpoint_result(xhci, udev, |
| &command->status); |
| else |
| ret = xhci_evaluate_context_result(xhci, udev, |
| &command->status); |
| |
| if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) { |
| spin_lock_irqsave(&xhci->lock, flags); |
| /* If the command failed, remove the reserved resources. |
| * Otherwise, clean up the estimate to include dropped eps. |
| */ |
| if (ret) |
| xhci_free_host_resources(xhci, ctrl_ctx); |
| else |
| xhci_finish_resource_reservation(xhci, ctrl_ctx); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| } |
| return ret; |
| } |
| |
| static void xhci_check_bw_drop_ep_streams(struct xhci_hcd *xhci, |
| struct xhci_virt_device *vdev, int i) |
| { |
| struct xhci_virt_ep *ep = &vdev->eps[i]; |
| |
| if (ep->ep_state & EP_HAS_STREAMS) { |
| xhci_warn(xhci, "WARN: endpoint 0x%02x has streams on set_interface, freeing streams.\n", |
| xhci_get_endpoint_address(i)); |
| xhci_free_stream_info(xhci, ep->stream_info); |
| ep->stream_info = NULL; |
| ep->ep_state &= ~EP_HAS_STREAMS; |
| } |
| } |
| |
| /* Called after one or more calls to xhci_add_endpoint() or |
| * xhci_drop_endpoint(). If this call fails, the USB core is expected |
| * to call xhci_reset_bandwidth(). |
| * |
| * Since we are in the middle of changing either configuration or |
| * installing a new alt setting, the USB core won't allow URBs to be |
| * enqueued for any endpoint on the old config or interface. Nothing |
| * else should be touching the xhci->devs[slot_id] structure, so we |
| * don't need to take the xhci->lock for manipulating that. |
| */ |
| int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev) |
| { |
| int i; |
| int ret = 0; |
| struct xhci_hcd *xhci; |
| struct xhci_virt_device *virt_dev; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| struct xhci_slot_ctx *slot_ctx; |
| struct xhci_command *command; |
| |
| ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__); |
| if (ret <= 0) |
| return ret; |
| xhci = hcd_to_xhci(hcd); |
| if ((xhci->xhc_state & XHCI_STATE_DYING) || |
| (xhci->xhc_state & XHCI_STATE_REMOVING)) |
| return -ENODEV; |
| |
| xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev); |
| virt_dev = xhci->devs[udev->slot_id]; |
| |
| command = xhci_alloc_command(xhci, false, true, GFP_KERNEL); |
| if (!command) |
| return -ENOMEM; |
| |
| command->in_ctx = virt_dev->in_ctx; |
| |
| /* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */ |
| ctrl_ctx = xhci_get_input_control_ctx(command->in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| ret = -ENOMEM; |
| goto command_cleanup; |
| } |
| ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG); |
| ctrl_ctx->add_flags &= cpu_to_le32(~EP0_FLAG); |
| ctrl_ctx->drop_flags &= cpu_to_le32(~(SLOT_FLAG | EP0_FLAG)); |
| |
| /* Don't issue the command if there's no endpoints to update. */ |
| if (ctrl_ctx->add_flags == cpu_to_le32(SLOT_FLAG) && |
| ctrl_ctx->drop_flags == 0) { |
| ret = 0; |
| goto command_cleanup; |
| } |
| /* Fix up Context Entries field. Minimum value is EP0 == BIT(1). */ |
| slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx); |
| for (i = 31; i >= 1; i--) { |
| __le32 le32 = cpu_to_le32(BIT(i)); |
| |
| if ((virt_dev->eps[i-1].ring && !(ctrl_ctx->drop_flags & le32)) |
| || (ctrl_ctx->add_flags & le32) || i == 1) { |
| slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK); |
| slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(i)); |
| break; |
| } |
| } |
| xhci_dbg(xhci, "New Input Control Context:\n"); |
| xhci_dbg_ctx(xhci, virt_dev->in_ctx, |
| LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info))); |
| |
| ret = xhci_configure_endpoint(xhci, udev, command, |
| false, false); |
| if (ret) |
| /* Callee should call reset_bandwidth() */ |
| goto command_cleanup; |
| |
| xhci_dbg(xhci, "Output context after successful config ep cmd:\n"); |
| xhci_dbg_ctx(xhci, virt_dev->out_ctx, |
| LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info))); |
| |
| /* Free any rings that were dropped, but not changed. */ |
| for (i = 1; i < 31; ++i) { |
| if ((le32_to_cpu(ctrl_ctx->drop_flags) & (1 << (i + 1))) && |
| !(le32_to_cpu(ctrl_ctx->add_flags) & (1 << (i + 1)))) { |
| xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i); |
| xhci_check_bw_drop_ep_streams(xhci, virt_dev, i); |
| } |
| } |
| xhci_zero_in_ctx(xhci, virt_dev); |
| /* |
| * Install any rings for completely new endpoints or changed endpoints, |
| * and free or cache any old rings from changed endpoints. |
| */ |
| for (i = 1; i < 31; ++i) { |
| if (!virt_dev->eps[i].new_ring) |
| continue; |
| /* Only cache or free the old ring if it exists. |
| * It may not if this is the first add of an endpoint. |
| */ |
| if (virt_dev->eps[i].ring) { |
| xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i); |
| } |
| xhci_check_bw_drop_ep_streams(xhci, virt_dev, i); |
| virt_dev->eps[i].ring = virt_dev->eps[i].new_ring; |
| virt_dev->eps[i].new_ring = NULL; |
| } |
| command_cleanup: |
| kfree(command->completion); |
| kfree(command); |
| |
| return ret; |
| } |
| |
| void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev) |
| { |
| struct xhci_hcd *xhci; |
| struct xhci_virt_device *virt_dev; |
| int i, ret; |
| |
| ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__); |
| if (ret <= 0) |
| return; |
| xhci = hcd_to_xhci(hcd); |
| |
| xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev); |
| virt_dev = xhci->devs[udev->slot_id]; |
| /* Free any rings allocated for added endpoints */ |
| for (i = 0; i < 31; ++i) { |
| if (virt_dev->eps[i].new_ring) { |
| xhci_ring_free(xhci, virt_dev->eps[i].new_ring); |
| virt_dev->eps[i].new_ring = NULL; |
| } |
| } |
| xhci_zero_in_ctx(xhci, virt_dev); |
| } |
| |
| static void xhci_setup_input_ctx_for_config_ep(struct xhci_hcd *xhci, |
| struct xhci_container_ctx *in_ctx, |
| struct xhci_container_ctx *out_ctx, |
| struct xhci_input_control_ctx *ctrl_ctx, |
| u32 add_flags, u32 drop_flags) |
| { |
| ctrl_ctx->add_flags = cpu_to_le32(add_flags); |
| ctrl_ctx->drop_flags = cpu_to_le32(drop_flags); |
| xhci_slot_copy(xhci, in_ctx, out_ctx); |
| ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG); |
| |
| xhci_dbg(xhci, "Input Context:\n"); |
| xhci_dbg_ctx(xhci, in_ctx, xhci_last_valid_endpoint(add_flags)); |
| } |
| |
| static void xhci_setup_input_ctx_for_quirk(struct xhci_hcd *xhci, |
| unsigned int slot_id, unsigned int ep_index, |
| struct xhci_dequeue_state *deq_state) |
| { |
| struct xhci_input_control_ctx *ctrl_ctx; |
| struct xhci_container_ctx *in_ctx; |
| struct xhci_ep_ctx *ep_ctx; |
| u32 added_ctxs; |
| dma_addr_t addr; |
| |
| in_ctx = xhci->devs[slot_id]->in_ctx; |
| ctrl_ctx = xhci_get_input_control_ctx(in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| return; |
| } |
| |
| xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx, |
| xhci->devs[slot_id]->out_ctx, ep_index); |
| ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index); |
| addr = xhci_trb_virt_to_dma(deq_state->new_deq_seg, |
| deq_state->new_deq_ptr); |
| if (addr == 0) { |
| xhci_warn(xhci, "WARN Cannot submit config ep after " |
| "reset ep command\n"); |
| xhci_warn(xhci, "WARN deq seg = %p, deq ptr = %p\n", |
| deq_state->new_deq_seg, |
| deq_state->new_deq_ptr); |
| return; |
| } |
| ep_ctx->deq = cpu_to_le64(addr | deq_state->new_cycle_state); |
| |
| added_ctxs = xhci_get_endpoint_flag_from_index(ep_index); |
| xhci_setup_input_ctx_for_config_ep(xhci, xhci->devs[slot_id]->in_ctx, |
| xhci->devs[slot_id]->out_ctx, ctrl_ctx, |
| added_ctxs, added_ctxs); |
| } |
| |
| void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci, |
| unsigned int ep_index, struct xhci_td *td) |
| { |
| struct xhci_dequeue_state deq_state; |
| struct xhci_virt_ep *ep; |
| struct usb_device *udev = td->urb->dev; |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_reset_ep, |
| "Cleaning up stalled endpoint ring"); |
| ep = &xhci->devs[udev->slot_id]->eps[ep_index]; |
| /* We need to move the HW's dequeue pointer past this TD, |
| * or it will attempt to resend it on the next doorbell ring. |
| */ |
| xhci_find_new_dequeue_state(xhci, udev->slot_id, |
| ep_index, ep->stopped_stream, td, &deq_state); |
| |
| if (!deq_state.new_deq_ptr || !deq_state.new_deq_seg) |
| return; |
| |
| /* HW with the reset endpoint quirk will use the saved dequeue state to |
| * issue a configure endpoint command later. |
| */ |
| if (!(xhci->quirks & XHCI_RESET_EP_QUIRK)) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_reset_ep, |
| "Queueing new dequeue state"); |
| xhci_queue_new_dequeue_state(xhci, udev->slot_id, |
| ep_index, ep->stopped_stream, &deq_state); |
| } else { |
| /* Better hope no one uses the input context between now and the |
| * reset endpoint completion! |
| * XXX: No idea how this hardware will react when stream rings |
| * are enabled. |
| */ |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Setting up input context for " |
| "configure endpoint command"); |
| xhci_setup_input_ctx_for_quirk(xhci, udev->slot_id, |
| ep_index, &deq_state); |
| } |
| } |
| |
| /* Called when clearing halted device. The core should have sent the control |
| * message to clear the device halt condition. The host side of the halt should |
| * already be cleared with a reset endpoint command issued when the STALL tx |
| * event was received. |
| * |
| * Context: in_interrupt |
| */ |
| |
| void xhci_endpoint_reset(struct usb_hcd *hcd, |
| struct usb_host_endpoint *ep) |
| { |
| struct xhci_hcd *xhci; |
| |
| xhci = hcd_to_xhci(hcd); |
| |
| /* |
| * We might need to implement the config ep cmd in xhci 4.8.1 note: |
| * The Reset Endpoint Command may only be issued to endpoints in the |
| * Halted state. If software wishes reset the Data Toggle or Sequence |
| * Number of an endpoint that isn't in the Halted state, then software |
| * may issue a Configure Endpoint Command with the Drop and Add bits set |
| * for the target endpoint. that is in the Stopped state. |
| */ |
| |
| /* For now just print debug to follow the situation */ |
| xhci_dbg(xhci, "Endpoint 0x%x ep reset callback called\n", |
| ep->desc.bEndpointAddress); |
| } |
| |
| static int xhci_check_streams_endpoint(struct xhci_hcd *xhci, |
| struct usb_device *udev, struct usb_host_endpoint *ep, |
| unsigned int slot_id) |
| { |
| int ret; |
| unsigned int ep_index; |
| unsigned int ep_state; |
| |
| if (!ep) |
| return -EINVAL; |
| ret = xhci_check_args(xhci_to_hcd(xhci), udev, ep, 1, true, __func__); |
| if (ret <= 0) |
| return -EINVAL; |
| if (usb_ss_max_streams(&ep->ss_ep_comp) == 0) { |
| xhci_warn(xhci, "WARN: SuperSpeed Endpoint Companion" |
| " descriptor for ep 0x%x does not support streams\n", |
| ep->desc.bEndpointAddress); |
| return -EINVAL; |
| } |
| |
| ep_index = xhci_get_endpoint_index(&ep->desc); |
| ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state; |
| if (ep_state & EP_HAS_STREAMS || |
| ep_state & EP_GETTING_STREAMS) { |
| xhci_warn(xhci, "WARN: SuperSpeed bulk endpoint 0x%x " |
| "already has streams set up.\n", |
| ep->desc.bEndpointAddress); |
| xhci_warn(xhci, "Send email to xHCI maintainer and ask for " |
| "dynamic stream context array reallocation.\n"); |
| return -EINVAL; |
| } |
| if (!list_empty(&xhci->devs[slot_id]->eps[ep_index].ring->td_list)) { |
| xhci_warn(xhci, "Cannot setup streams for SuperSpeed bulk " |
| "endpoint 0x%x; URBs are pending.\n", |
| ep->desc.bEndpointAddress); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static void xhci_calculate_streams_entries(struct xhci_hcd *xhci, |
| unsigned int *num_streams, unsigned int *num_stream_ctxs) |
| { |
| unsigned int max_streams; |
| |
| /* The stream context array size must be a power of two */ |
| *num_stream_ctxs = roundup_pow_of_two(*num_streams); |
| /* |
| * Find out how many primary stream array entries the host controller |
| * supports. Later we may use secondary stream arrays (similar to 2nd |
| * level page entries), but that's an optional feature for xHCI host |
| * controllers. xHCs must support at least 4 stream IDs. |
| */ |
| max_streams = HCC_MAX_PSA(xhci->hcc_params); |
| if (*num_stream_ctxs > max_streams) { |
| xhci_dbg(xhci, "xHCI HW only supports %u stream ctx entries.\n", |
| max_streams); |
| *num_stream_ctxs = max_streams; |
| *num_streams = max_streams; |
| } |
| } |
| |
| /* Returns an error code if one of the endpoint already has streams. |
| * This does not change any data structures, it only checks and gathers |
| * information. |
| */ |
| static int xhci_calculate_streams_and_bitmask(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| struct usb_host_endpoint **eps, unsigned int num_eps, |
| unsigned int *num_streams, u32 *changed_ep_bitmask) |
| { |
| unsigned int max_streams; |
| unsigned int endpoint_flag; |
| int i; |
| int ret; |
| |
| for (i = 0; i < num_eps; i++) { |
| ret = xhci_check_streams_endpoint(xhci, udev, |
| eps[i], udev->slot_id); |
| if (ret < 0) |
| return ret; |
| |
| max_streams = usb_ss_max_streams(&eps[i]->ss_ep_comp); |
| if (max_streams < (*num_streams - 1)) { |
| xhci_dbg(xhci, "Ep 0x%x only supports %u stream IDs.\n", |
| eps[i]->desc.bEndpointAddress, |
| max_streams); |
| *num_streams = max_streams+1; |
| } |
| |
| endpoint_flag = xhci_get_endpoint_flag(&eps[i]->desc); |
| if (*changed_ep_bitmask & endpoint_flag) |
| return -EINVAL; |
| *changed_ep_bitmask |= endpoint_flag; |
| } |
| return 0; |
| } |
| |
| static u32 xhci_calculate_no_streams_bitmask(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| struct usb_host_endpoint **eps, unsigned int num_eps) |
| { |
| u32 changed_ep_bitmask = 0; |
| unsigned int slot_id; |
| unsigned int ep_index; |
| unsigned int ep_state; |
| int i; |
| |
| slot_id = udev->slot_id; |
| if (!xhci->devs[slot_id]) |
| return 0; |
| |
| for (i = 0; i < num_eps; i++) { |
| ep_index = xhci_get_endpoint_index(&eps[i]->desc); |
| ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state; |
| /* Are streams already being freed for the endpoint? */ |
| if (ep_state & EP_GETTING_NO_STREAMS) { |
| xhci_warn(xhci, "WARN Can't disable streams for " |
| "endpoint 0x%x, " |
| "streams are being disabled already\n", |
| eps[i]->desc.bEndpointAddress); |
| return 0; |
| } |
| /* Are there actually any streams to free? */ |
| if (!(ep_state & EP_HAS_STREAMS) && |
| !(ep_state & EP_GETTING_STREAMS)) { |
| xhci_warn(xhci, "WARN Can't disable streams for " |
| "endpoint 0x%x, " |
| "streams are already disabled!\n", |
| eps[i]->desc.bEndpointAddress); |
| xhci_warn(xhci, "WARN xhci_free_streams() called " |
| "with non-streams endpoint\n"); |
| return 0; |
| } |
| changed_ep_bitmask |= xhci_get_endpoint_flag(&eps[i]->desc); |
| } |
| return changed_ep_bitmask; |
| } |
| |
| /* |
| * The USB device drivers use this function (through the HCD interface in USB |
| * core) to prepare a set of bulk endpoints to use streams. Streams are used to |
| * coordinate mass storage command queueing across multiple endpoints (basically |
| * a stream ID == a task ID). |
| * |
| * Setting up streams involves allocating the same size stream context array |
| * for each endpoint and issuing a configure endpoint command for all endpoints. |
| * |
| * Don't allow the call to succeed if one endpoint only supports one stream |
| * (which means it doesn't support streams at all). |
| * |
| * Drivers may get less stream IDs than they asked for, if the host controller |
| * hardware or endpoints claim they can't support the number of requested |
| * stream IDs. |
| */ |
| int xhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, |
| struct usb_host_endpoint **eps, unsigned int num_eps, |
| unsigned int num_streams, gfp_t mem_flags) |
| { |
| int i, ret; |
| struct xhci_hcd *xhci; |
| struct xhci_virt_device *vdev; |
| struct xhci_command *config_cmd; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| unsigned int ep_index; |
| unsigned int num_stream_ctxs; |
| unsigned long flags; |
| u32 changed_ep_bitmask = 0; |
| |
| if (!eps) |
| return -EINVAL; |
| |
| /* Add one to the number of streams requested to account for |
| * stream 0 that is reserved for xHCI usage. |
| */ |
| num_streams += 1; |
| xhci = hcd_to_xhci(hcd); |
| xhci_dbg(xhci, "Driver wants %u stream IDs (including stream 0).\n", |
| num_streams); |
| |
| /* MaxPSASize value 0 (2 streams) means streams are not supported */ |
| if ((xhci->quirks & XHCI_BROKEN_STREAMS) || |
| HCC_MAX_PSA(xhci->hcc_params) < 4) { |
| xhci_dbg(xhci, "xHCI controller does not support streams.\n"); |
| return -ENOSYS; |
| } |
| |
| config_cmd = xhci_alloc_command(xhci, true, true, mem_flags); |
| if (!config_cmd) { |
| xhci_dbg(xhci, "Could not allocate xHCI command structure.\n"); |
| return -ENOMEM; |
| } |
| ctrl_ctx = xhci_get_input_control_ctx(config_cmd->in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| xhci_free_command(xhci, config_cmd); |
| return -ENOMEM; |
| } |
| |
| /* Check to make sure all endpoints are not already configured for |
| * streams. While we're at it, find the maximum number of streams that |
| * all the endpoints will support and check for duplicate endpoints. |
| */ |
| spin_lock_irqsave(&xhci->lock, flags); |
| ret = xhci_calculate_streams_and_bitmask(xhci, udev, eps, |
| num_eps, &num_streams, &changed_ep_bitmask); |
| if (ret < 0) { |
| xhci_free_command(xhci, config_cmd); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return ret; |
| } |
| if (num_streams <= 1) { |
| xhci_warn(xhci, "WARN: endpoints can't handle " |
| "more than one stream.\n"); |
| xhci_free_command(xhci, config_cmd); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return -EINVAL; |
| } |
| vdev = xhci->devs[udev->slot_id]; |
| /* Mark each endpoint as being in transition, so |
| * xhci_urb_enqueue() will reject all URBs. |
| */ |
| for (i = 0; i < num_eps; i++) { |
| ep_index = xhci_get_endpoint_index(&eps[i]->desc); |
| vdev->eps[ep_index].ep_state |= EP_GETTING_STREAMS; |
| } |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| /* Setup internal data structures and allocate HW data structures for |
| * streams (but don't install the HW structures in the input context |
| * until we're sure all memory allocation succeeded). |
| */ |
| xhci_calculate_streams_entries(xhci, &num_streams, &num_stream_ctxs); |
| xhci_dbg(xhci, "Need %u stream ctx entries for %u stream IDs.\n", |
| num_stream_ctxs, num_streams); |
| |
| for (i = 0; i < num_eps; i++) { |
| ep_index = xhci_get_endpoint_index(&eps[i]->desc); |
| vdev->eps[ep_index].stream_info = xhci_alloc_stream_info(xhci, |
| num_stream_ctxs, |
| num_streams, mem_flags); |
| if (!vdev->eps[ep_index].stream_info) |
| goto cleanup; |
| /* Set maxPstreams in endpoint context and update deq ptr to |
| * point to stream context array. FIXME |
| */ |
| } |
| |
| /* Set up the input context for a configure endpoint command. */ |
| for (i = 0; i < num_eps; i++) { |
| struct xhci_ep_ctx *ep_ctx; |
| |
| ep_index = xhci_get_endpoint_index(&eps[i]->desc); |
| ep_ctx = xhci_get_ep_ctx(xhci, config_cmd->in_ctx, ep_index); |
| |
| xhci_endpoint_copy(xhci, config_cmd->in_ctx, |
| vdev->out_ctx, ep_index); |
| xhci_setup_streams_ep_input_ctx(xhci, ep_ctx, |
| vdev->eps[ep_index].stream_info); |
| } |
| /* Tell the HW to drop its old copy of the endpoint context info |
| * and add the updated copy from the input context. |
| */ |
| xhci_setup_input_ctx_for_config_ep(xhci, config_cmd->in_ctx, |
| vdev->out_ctx, ctrl_ctx, |
| changed_ep_bitmask, changed_ep_bitmask); |
| |
| /* Issue and wait for the configure endpoint command */ |
| ret = xhci_configure_endpoint(xhci, udev, config_cmd, |
| false, false); |
| |
| /* xHC rejected the configure endpoint command for some reason, so we |
| * leave the old ring intact and free our internal streams data |
| * structure. |
| */ |
| if (ret < 0) |
| goto cleanup; |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| for (i = 0; i < num_eps; i++) { |
| ep_index = xhci_get_endpoint_index(&eps[i]->desc); |
| vdev->eps[ep_index].ep_state &= ~EP_GETTING_STREAMS; |
| xhci_dbg(xhci, "Slot %u ep ctx %u now has streams.\n", |
| udev->slot_id, ep_index); |
| vdev->eps[ep_index].ep_state |= EP_HAS_STREAMS; |
| } |
| xhci_free_command(xhci, config_cmd); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| /* Subtract 1 for stream 0, which drivers can't use */ |
| return num_streams - 1; |
| |
| cleanup: |
| /* If it didn't work, free the streams! */ |
| for (i = 0; i < num_eps; i++) { |
| ep_index = xhci_get_endpoint_index(&eps[i]->desc); |
| xhci_free_stream_info(xhci, vdev->eps[ep_index].stream_info); |
| vdev->eps[ep_index].stream_info = NULL; |
| /* FIXME Unset maxPstreams in endpoint context and |
| * update deq ptr to point to normal string ring. |
| */ |
| vdev->eps[ep_index].ep_state &= ~EP_GETTING_STREAMS; |
| vdev->eps[ep_index].ep_state &= ~EP_HAS_STREAMS; |
| xhci_endpoint_zero(xhci, vdev, eps[i]); |
| } |
| xhci_free_command(xhci, config_cmd); |
| return -ENOMEM; |
| } |
| |
| /* Transition the endpoint from using streams to being a "normal" endpoint |
| * without streams. |
| * |
| * Modify the endpoint context state, submit a configure endpoint command, |
| * and free all endpoint rings for streams if that completes successfully. |
| */ |
| int xhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev, |
| struct usb_host_endpoint **eps, unsigned int num_eps, |
| gfp_t mem_flags) |
| { |
| int i, ret; |
| struct xhci_hcd *xhci; |
| struct xhci_virt_device *vdev; |
| struct xhci_command *command; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| unsigned int ep_index; |
| unsigned long flags; |
| u32 changed_ep_bitmask; |
| |
| xhci = hcd_to_xhci(hcd); |
| vdev = xhci->devs[udev->slot_id]; |
| |
| /* Set up a configure endpoint command to remove the streams rings */ |
| spin_lock_irqsave(&xhci->lock, flags); |
| changed_ep_bitmask = xhci_calculate_no_streams_bitmask(xhci, |
| udev, eps, num_eps); |
| if (changed_ep_bitmask == 0) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return -EINVAL; |
| } |
| |
| /* Use the xhci_command structure from the first endpoint. We may have |
| * allocated too many, but the driver may call xhci_free_streams() for |
| * each endpoint it grouped into one call to xhci_alloc_streams(). |
| */ |
| ep_index = xhci_get_endpoint_index(&eps[0]->desc); |
| command = vdev->eps[ep_index].stream_info->free_streams_command; |
| ctrl_ctx = xhci_get_input_control_ctx(command->in_ctx); |
| if (!ctrl_ctx) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| return -EINVAL; |
| } |
| |
| for (i = 0; i < num_eps; i++) { |
| struct xhci_ep_ctx *ep_ctx; |
| |
| ep_index = xhci_get_endpoint_index(&eps[i]->desc); |
| ep_ctx = xhci_get_ep_ctx(xhci, command->in_ctx, ep_index); |
| xhci->devs[udev->slot_id]->eps[ep_index].ep_state |= |
| EP_GETTING_NO_STREAMS; |
| |
| xhci_endpoint_copy(xhci, command->in_ctx, |
| vdev->out_ctx, ep_index); |
| xhci_setup_no_streams_ep_input_ctx(ep_ctx, |
| &vdev->eps[ep_index]); |
| } |
| xhci_setup_input_ctx_for_config_ep(xhci, command->in_ctx, |
| vdev->out_ctx, ctrl_ctx, |
| changed_ep_bitmask, changed_ep_bitmask); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| /* Issue and wait for the configure endpoint command, |
| * which must succeed. |
| */ |
| ret = xhci_configure_endpoint(xhci, udev, command, |
| false, true); |
| |
| /* xHC rejected the configure endpoint command for some reason, so we |
| * leave the streams rings intact. |
| */ |
| if (ret < 0) |
| return ret; |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| for (i = 0; i < num_eps; i++) { |
| ep_index = xhci_get_endpoint_index(&eps[i]->desc); |
| xhci_free_stream_info(xhci, vdev->eps[ep_index].stream_info); |
| vdev->eps[ep_index].stream_info = NULL; |
| /* FIXME Unset maxPstreams in endpoint context and |
| * update deq ptr to point to normal string ring. |
| */ |
| vdev->eps[ep_index].ep_state &= ~EP_GETTING_NO_STREAMS; |
| vdev->eps[ep_index].ep_state &= ~EP_HAS_STREAMS; |
| } |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| return 0; |
| } |
| |
| /* |
| * Deletes endpoint resources for endpoints that were active before a Reset |
| * Device command, or a Disable Slot command. The Reset Device command leaves |
| * the control endpoint intact, whereas the Disable Slot command deletes it. |
| * |
| * Must be called with xhci->lock held. |
| */ |
| void xhci_free_device_endpoint_resources(struct xhci_hcd *xhci, |
| struct xhci_virt_device *virt_dev, bool drop_control_ep) |
| { |
| int i; |
| unsigned int num_dropped_eps = 0; |
| unsigned int drop_flags = 0; |
| |
| for (i = (drop_control_ep ? 0 : 1); i < 31; i++) { |
| if (virt_dev->eps[i].ring) { |
| drop_flags |= 1 << i; |
| num_dropped_eps++; |
| } |
| } |
| xhci->num_active_eps -= num_dropped_eps; |
| if (num_dropped_eps) |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Dropped %u ep ctxs, flags = 0x%x, " |
| "%u now active.", |
| num_dropped_eps, drop_flags, |
| xhci->num_active_eps); |
| } |
| |
| /* |
| * This submits a Reset Device Command, which will set the device state to 0, |
| * set the device address to 0, and disable all the endpoints except the default |
| * control endpoint. The USB core should come back and call |
| * xhci_address_device(), and then re-set up the configuration. If this is |
| * called because of a usb_reset_and_verify_device(), then the old alternate |
| * settings will be re-installed through the normal bandwidth allocation |
| * functions. |
| * |
| * Wait for the Reset Device command to finish. Remove all structures |
| * associated with the endpoints that were disabled. Clear the input device |
| * structure? Cache the rings? Reset the control endpoint 0 max packet size? |
| * |
| * If the virt_dev to be reset does not exist or does not match the udev, |
| * it means the device is lost, possibly due to the xHC restore error and |
| * re-initialization during S3/S4. In this case, call xhci_alloc_dev() to |
| * re-allocate the device. |
| */ |
| int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev) |
| { |
| int ret, i; |
| unsigned long flags; |
| struct xhci_hcd *xhci; |
| unsigned int slot_id; |
| struct xhci_virt_device *virt_dev; |
| struct xhci_command *reset_device_cmd; |
| int last_freed_endpoint; |
| struct xhci_slot_ctx *slot_ctx; |
| int old_active_eps = 0; |
| |
| ret = xhci_check_args(hcd, udev, NULL, 0, false, __func__); |
| if (ret <= 0) |
| return ret; |
| xhci = hcd_to_xhci(hcd); |
| slot_id = udev->slot_id; |
| virt_dev = xhci->devs[slot_id]; |
| if (!virt_dev) { |
| xhci_dbg(xhci, "The device to be reset with slot ID %u does " |
| "not exist. Re-allocate the device\n", slot_id); |
| ret = xhci_alloc_dev(hcd, udev); |
| if (ret == 1) |
| return 0; |
| else |
| return -EINVAL; |
| } |
| |
| if (virt_dev->tt_info) |
| old_active_eps = virt_dev->tt_info->active_eps; |
| |
| if (virt_dev->udev != udev) { |
| /* If the virt_dev and the udev does not match, this virt_dev |
| * may belong to another udev. |
| * Re-allocate the device. |
| */ |
| xhci_dbg(xhci, "The device to be reset with slot ID %u does " |
| "not match the udev. Re-allocate the device\n", |
| slot_id); |
| ret = xhci_alloc_dev(hcd, udev); |
| if (ret == 1) |
| return 0; |
| else |
| return -EINVAL; |
| } |
| |
| /* If device is not setup, there is no point in resetting it */ |
| slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx); |
| if (GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state)) == |
| SLOT_STATE_DISABLED) |
| return 0; |
| |
| xhci_dbg(xhci, "Resetting device with slot ID %u\n", slot_id); |
| /* Allocate the command structure that holds the struct completion. |
| * Assume we're in process context, since the normal device reset |
| * process has to wait for the device anyway. Storage devices are |
| * reset as part of error handling, so use GFP_NOIO instead of |
| * GFP_KERNEL. |
| */ |
| reset_device_cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO); |
| if (!reset_device_cmd) { |
| xhci_dbg(xhci, "Couldn't allocate command structure.\n"); |
| return -ENOMEM; |
| } |
| |
| /* Attempt to submit the Reset Device command to the command ring */ |
| spin_lock_irqsave(&xhci->lock, flags); |
| |
| ret = xhci_queue_reset_device(xhci, reset_device_cmd, slot_id); |
| if (ret) { |
| xhci_dbg(xhci, "FIXME: allocate a command ring segment\n"); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| goto command_cleanup; |
| } |
| xhci_ring_cmd_db(xhci); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| /* Wait for the Reset Device command to finish */ |
| wait_for_completion(reset_device_cmd->completion); |
| |
| /* The Reset Device command can't fail, according to the 0.95/0.96 spec, |
| * unless we tried to reset a slot ID that wasn't enabled, |
| * or the device wasn't in the addressed or configured state. |
| */ |
| ret = reset_device_cmd->status; |
| switch (ret) { |
| case COMP_CMD_ABORT: |
| case COMP_CMD_STOP: |
| xhci_warn(xhci, "Timeout waiting for reset device command\n"); |
| ret = -ETIME; |
| goto command_cleanup; |
| case COMP_EBADSLT: /* 0.95 completion code for bad slot ID */ |
| case COMP_CTX_STATE: /* 0.96 completion code for same thing */ |
| xhci_dbg(xhci, "Can't reset device (slot ID %u) in %s state\n", |
| slot_id, |
| xhci_get_slot_state(xhci, virt_dev->out_ctx)); |
| xhci_dbg(xhci, "Not freeing device rings.\n"); |
| /* Don't treat this as an error. May change my mind later. */ |
| ret = 0; |
| goto command_cleanup; |
| case COMP_SUCCESS: |
| xhci_dbg(xhci, "Successful reset device command.\n"); |
| break; |
| default: |
| if (xhci_is_vendor_info_code(xhci, ret)) |
| break; |
| xhci_warn(xhci, "Unknown completion code %u for " |
| "reset device command.\n", ret); |
| ret = -EINVAL; |
| goto command_cleanup; |
| } |
| |
| /* Free up host controller endpoint resources */ |
| if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) { |
| spin_lock_irqsave(&xhci->lock, flags); |
| /* Don't delete the default control endpoint resources */ |
| xhci_free_device_endpoint_resources(xhci, virt_dev, false); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| } |
| |
| /* Everything but endpoint 0 is disabled, so free or cache the rings. */ |
| last_freed_endpoint = 1; |
| for (i = 1; i < 31; ++i) { |
| struct xhci_virt_ep *ep = &virt_dev->eps[i]; |
| |
| if (ep->ep_state & EP_HAS_STREAMS) { |
| xhci_warn(xhci, "WARN: endpoint 0x%02x has streams on device reset, freeing streams.\n", |
| xhci_get_endpoint_address(i)); |
| xhci_free_stream_info(xhci, ep->stream_info); |
| ep->stream_info = NULL; |
| ep->ep_state &= ~EP_HAS_STREAMS; |
| } |
| |
| if (ep->ring) { |
| xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i); |
| last_freed_endpoint = i; |
| } |
| if (!list_empty(&virt_dev->eps[i].bw_endpoint_list)) |
| xhci_drop_ep_from_interval_table(xhci, |
| &virt_dev->eps[i].bw_info, |
| virt_dev->bw_table, |
| udev, |
| &virt_dev->eps[i], |
| virt_dev->tt_info); |
| xhci_clear_endpoint_bw_info(&virt_dev->eps[i].bw_info); |
| } |
| /* If necessary, update the number of active TTs on this root port */ |
| xhci_update_tt_active_eps(xhci, virt_dev, old_active_eps); |
| |
| xhci_dbg(xhci, "Output context after successful reset device cmd:\n"); |
| xhci_dbg_ctx(xhci, virt_dev->out_ctx, last_freed_endpoint); |
| ret = 0; |
| |
| command_cleanup: |
| xhci_free_command(xhci, reset_device_cmd); |
| return ret; |
| } |
| |
| /* |
| * At this point, the struct usb_device is about to go away, the device has |
| * disconnected, and all traffic has been stopped and the endpoints have been |
| * disabled. Free any HC data structures associated with that device. |
| */ |
| void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| struct xhci_virt_device *virt_dev; |
| unsigned long flags; |
| u32 state; |
| int i, ret; |
| struct xhci_command *command; |
| |
| command = xhci_alloc_command(xhci, false, false, GFP_KERNEL); |
| if (!command) |
| return; |
| |
| #ifndef CONFIG_USB_DEFAULT_PERSIST |
| /* |
| * We called pm_runtime_get_noresume when the device was attached. |
| * Decrement the counter here to allow controller to runtime suspend |
| * if no devices remain. |
| */ |
| if (xhci->quirks & XHCI_RESET_ON_RESUME) |
| pm_runtime_put_noidle(hcd->self.controller); |
| #endif |
| |
| ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__); |
| /* If the host is halted due to driver unload, we still need to free the |
| * device. |
| */ |
| if (ret <= 0 && ret != -ENODEV) { |
| kfree(command); |
| return; |
| } |
| |
| virt_dev = xhci->devs[udev->slot_id]; |
| |
| /* Stop any wayward timer functions (which may grab the lock) */ |
| for (i = 0; i < 31; ++i) { |
| virt_dev->eps[i].ep_state &= ~EP_HALT_PENDING; |
| del_timer_sync(&virt_dev->eps[i].stop_cmd_timer); |
| } |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| /* Don't disable the slot if the host controller is dead. */ |
| state = readl(&xhci->op_regs->status); |
| if (state == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING) || |
| (xhci->xhc_state & XHCI_STATE_HALTED)) { |
| xhci_free_virt_device(xhci, udev->slot_id); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| kfree(command); |
| return; |
| } |
| |
| if (xhci_queue_slot_control(xhci, command, TRB_DISABLE_SLOT, |
| udev->slot_id)) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_dbg(xhci, "FIXME: allocate a command ring segment\n"); |
| return; |
| } |
| xhci_ring_cmd_db(xhci); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| /* |
| * Event command completion handler will free any data structures |
| * associated with the slot. XXX Can free sleep? |
| */ |
| } |
| |
| /* |
| * Checks if we have enough host controller resources for the default control |
| * endpoint. |
| * |
| * Must be called with xhci->lock held. |
| */ |
| static int xhci_reserve_host_control_ep_resources(struct xhci_hcd *xhci) |
| { |
| if (xhci->num_active_eps + 1 > xhci->limit_active_eps) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Not enough ep ctxs: " |
| "%u active, need to add 1, limit is %u.", |
| xhci->num_active_eps, xhci->limit_active_eps); |
| return -ENOMEM; |
| } |
| xhci->num_active_eps += 1; |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Adding 1 ep ctx, %u now active.", |
| xhci->num_active_eps); |
| return 0; |
| } |
| |
| |
| /* |
| * Returns 0 if the xHC ran out of device slots, the Enable Slot command |
| * timed out, or allocating memory failed. Returns 1 on success. |
| */ |
| int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| unsigned long flags; |
| int ret, slot_id; |
| struct xhci_command *command; |
| |
| command = xhci_alloc_command(xhci, false, false, GFP_KERNEL); |
| if (!command) |
| return 0; |
| |
| /* xhci->slot_id and xhci->addr_dev are not thread-safe */ |
| mutex_lock(&xhci->mutex); |
| spin_lock_irqsave(&xhci->lock, flags); |
| command->completion = &xhci->addr_dev; |
| ret = xhci_queue_slot_control(xhci, command, TRB_ENABLE_SLOT, 0); |
| if (ret) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| mutex_unlock(&xhci->mutex); |
| xhci_dbg(xhci, "FIXME: allocate a command ring segment\n"); |
| kfree(command); |
| return 0; |
| } |
| xhci_ring_cmd_db(xhci); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| wait_for_completion(command->completion); |
| slot_id = xhci->slot_id; |
| mutex_unlock(&xhci->mutex); |
| |
| if (!slot_id || command->status != COMP_SUCCESS) { |
| xhci_err(xhci, "Error while assigning device slot ID\n"); |
| xhci_err(xhci, "Max number of devices this xHCI host supports is %u.\n", |
| HCS_MAX_SLOTS( |
| readl(&xhci->cap_regs->hcs_params1))); |
| kfree(command); |
| return 0; |
| } |
| |
| if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) { |
| spin_lock_irqsave(&xhci->lock, flags); |
| ret = xhci_reserve_host_control_ep_resources(xhci); |
| if (ret) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_warn(xhci, "Not enough host resources, " |
| "active endpoint contexts = %u\n", |
| xhci->num_active_eps); |
| goto disable_slot; |
| } |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| } |
| /* Use GFP_NOIO, since this function can be called from |
| * xhci_discover_or_reset_device(), which may be called as part of |
| * mass storage driver error handling. |
| */ |
| if (!xhci_alloc_virt_device(xhci, slot_id, udev, GFP_NOIO)) { |
| xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n"); |
| goto disable_slot; |
| } |
| udev->slot_id = slot_id; |
| |
| #ifndef CONFIG_USB_DEFAULT_PERSIST |
| /* |
| * If resetting upon resume, we can't put the controller into runtime |
| * suspend if there is a device attached. |
| */ |
| if (xhci->quirks & XHCI_RESET_ON_RESUME) |
| pm_runtime_get_noresume(hcd->self.controller); |
| #endif |
| |
| |
| kfree(command); |
| /* Is this a LS or FS device under a HS hub? */ |
| /* Hub or peripherial? */ |
| return 1; |
| |
| disable_slot: |
| /* Disable slot, if we can do it without mem alloc */ |
| spin_lock_irqsave(&xhci->lock, flags); |
| command->completion = NULL; |
| command->status = 0; |
| if (!xhci_queue_slot_control(xhci, command, TRB_DISABLE_SLOT, |
| udev->slot_id)) |
| xhci_ring_cmd_db(xhci); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return 0; |
| } |
| |
| /* |
| * Issue an Address Device command and optionally send a corresponding |
| * SetAddress request to the device. |
| */ |
| static int xhci_setup_device(struct usb_hcd *hcd, struct usb_device *udev, |
| enum xhci_setup_dev setup) |
| { |
| const char *act = setup == SETUP_CONTEXT_ONLY ? "context" : "address"; |
| unsigned long flags; |
| struct xhci_virt_device *virt_dev; |
| int ret = 0; |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| struct xhci_slot_ctx *slot_ctx; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| u64 temp_64; |
| struct xhci_command *command = NULL; |
| |
| mutex_lock(&xhci->mutex); |
| |
| if (xhci->xhc_state) /* dying, removing or halted */ |
| goto out; |
| |
| if (!udev->slot_id) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_address, |
| "Bad Slot ID %d", udev->slot_id); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| virt_dev = xhci->devs[udev->slot_id]; |
| |
| if (WARN_ON(!virt_dev)) { |
| /* |
| * In plug/unplug torture test with an NEC controller, |
| * a zero-dereference was observed once due to virt_dev = 0. |
| * Print useful debug rather than crash if it is observed again! |
| */ |
| xhci_warn(xhci, "Virt dev invalid for slot_id 0x%x!\n", |
| udev->slot_id); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (setup == SETUP_CONTEXT_ONLY) { |
| slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx); |
| if (GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state)) == |
| SLOT_STATE_DEFAULT) { |
| xhci_dbg(xhci, "Slot already in default state\n"); |
| goto out; |
| } |
| } |
| |
| command = xhci_alloc_command(xhci, false, false, GFP_KERNEL); |
| if (!command) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| command->in_ctx = virt_dev->in_ctx; |
| command->completion = &xhci->addr_dev; |
| |
| slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx); |
| ctrl_ctx = xhci_get_input_control_ctx(virt_dev->in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| ret = -EINVAL; |
| goto out; |
| } |
| /* |
| * If this is the first Set Address since device plug-in or |
| * virt_device realloaction after a resume with an xHCI power loss, |
| * then set up the slot context. |
| */ |
| if (!slot_ctx->dev_info) |
| xhci_setup_addressable_virt_dev(xhci, udev); |
| /* Otherwise, update the control endpoint ring enqueue pointer. */ |
| else |
| xhci_copy_ep0_dequeue_into_input_ctx(xhci, udev); |
| ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG | EP0_FLAG); |
| ctrl_ctx->drop_flags = 0; |
| |
| xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id); |
| xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2); |
| trace_xhci_address_ctx(xhci, virt_dev->in_ctx, |
| le32_to_cpu(slot_ctx->dev_info) >> 27); |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| ret = xhci_queue_address_device(xhci, command, virt_dev->in_ctx->dma, |
| udev->slot_id, setup); |
| if (ret) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_address, |
| "FIXME: allocate a command ring segment"); |
| goto out; |
| } |
| xhci_ring_cmd_db(xhci); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| /* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */ |
| wait_for_completion(command->completion); |
| |
| /* FIXME: From section 4.3.4: "Software shall be responsible for timing |
| * the SetAddress() "recovery interval" required by USB and aborting the |
| * command on a timeout. |
| */ |
| switch (command->status) { |
| case COMP_CMD_ABORT: |
| case COMP_CMD_STOP: |
| xhci_warn(xhci, "Timeout while waiting for setup device command\n"); |
| ret = -ETIME; |
| break; |
| case COMP_CTX_STATE: |
| case COMP_EBADSLT: |
| xhci_err(xhci, "Setup ERROR: setup %s command for slot %d.\n", |
| act, udev->slot_id); |
| ret = -EINVAL; |
| break; |
| case COMP_TX_ERR: |
| dev_warn(&udev->dev, "Device not responding to setup %s.\n", act); |
| ret = -EPROTO; |
| break; |
| case COMP_DEV_ERR: |
| dev_warn(&udev->dev, |
| "ERROR: Incompatible device for setup %s command\n", act); |
| ret = -ENODEV; |
| break; |
| case COMP_SUCCESS: |
| xhci_dbg_trace(xhci, trace_xhci_dbg_address, |
| "Successful setup %s command", act); |
| break; |
| default: |
| xhci_err(xhci, |
| "ERROR: unexpected setup %s command completion code 0x%x.\n", |
| act, command->status); |
| xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id); |
| xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2); |
| trace_xhci_address_ctx(xhci, virt_dev->out_ctx, 1); |
| ret = -EINVAL; |
| break; |
| } |
| if (ret) |
| goto out; |
| temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_address, |
| "Op regs DCBAA ptr = %#016llx", temp_64); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_address, |
| "Slot ID %d dcbaa entry @%p = %#016llx", |
| udev->slot_id, |
| &xhci->dcbaa->dev_context_ptrs[udev->slot_id], |
| (unsigned long long) |
| le64_to_cpu(xhci->dcbaa->dev_context_ptrs[udev->slot_id])); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_address, |
| "Output Context DMA address = %#08llx", |
| (unsigned long long)virt_dev->out_ctx->dma); |
| xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id); |
| xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2); |
| trace_xhci_address_ctx(xhci, virt_dev->in_ctx, |
| le32_to_cpu(slot_ctx->dev_info) >> 27); |
| xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id); |
| xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2); |
| /* |
| * USB core uses address 1 for the roothubs, so we add one to the |
| * address given back to us by the HC. |
| */ |
| slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx); |
| trace_xhci_address_ctx(xhci, virt_dev->out_ctx, |
| le32_to_cpu(slot_ctx->dev_info) >> 27); |
| /* Zero the input context control for later use */ |
| ctrl_ctx->add_flags = 0; |
| ctrl_ctx->drop_flags = 0; |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_address, |
| "Internal device address = %d", |
| le32_to_cpu(slot_ctx->dev_state) & DEV_ADDR_MASK); |
| out: |
| mutex_unlock(&xhci->mutex); |
| kfree(command); |
| return ret; |
| } |
| |
| int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev) |
| { |
| return xhci_setup_device(hcd, udev, SETUP_CONTEXT_ADDRESS); |
| } |
| |
| int xhci_enable_device(struct usb_hcd *hcd, struct usb_device *udev) |
| { |
| return xhci_setup_device(hcd, udev, SETUP_CONTEXT_ONLY); |
| } |
| |
| /* |
| * Transfer the port index into real index in the HW port status |
| * registers. Caculate offset between the port's PORTSC register |
| * and port status base. Divide the number of per port register |
| * to get the real index. The raw port number bases 1. |
| */ |
| int xhci_find_raw_port_number(struct usb_hcd *hcd, int port1) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| __le32 __iomem *base_addr = &xhci->op_regs->port_status_base; |
| __le32 __iomem *addr; |
| int raw_port; |
| |
| if (hcd->speed < HCD_USB3) |
| addr = xhci->usb2_ports[port1 - 1]; |
| else |
| addr = xhci->usb3_ports[port1 - 1]; |
| |
| raw_port = (addr - base_addr)/NUM_PORT_REGS + 1; |
| return raw_port; |
| } |
| |
| /* |
| * Issue an Evaluate Context command to change the Maximum Exit Latency in the |
| * slot context. If that succeeds, store the new MEL in the xhci_virt_device. |
| */ |
| static int __maybe_unused xhci_change_max_exit_latency(struct xhci_hcd *xhci, |
| struct usb_device *udev, u16 max_exit_latency) |
| { |
| struct xhci_virt_device *virt_dev; |
| struct xhci_command *command; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| struct xhci_slot_ctx *slot_ctx; |
| unsigned long flags; |
| int ret; |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| |
| virt_dev = xhci->devs[udev->slot_id]; |
| |
| /* |
| * virt_dev might not exists yet if xHC resumed from hibernate (S4) and |
| * xHC was re-initialized. Exit latency will be set later after |
| * hub_port_finish_reset() is done and xhci->devs[] are re-allocated |
| */ |
| |
| if (!virt_dev || max_exit_latency == virt_dev->current_mel) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return 0; |
| } |
| |
| /* Attempt to issue an Evaluate Context command to change the MEL. */ |
| command = xhci->lpm_command; |
| ctrl_ctx = xhci_get_input_control_ctx(command->in_ctx); |
| if (!ctrl_ctx) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| return -ENOMEM; |
| } |
| |
| xhci_slot_copy(xhci, command->in_ctx, virt_dev->out_ctx); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG); |
| slot_ctx = xhci_get_slot_ctx(xhci, command->in_ctx); |
| slot_ctx->dev_info2 &= cpu_to_le32(~((u32) MAX_EXIT)); |
| slot_ctx->dev_info2 |= cpu_to_le32(max_exit_latency); |
| slot_ctx->dev_state = 0; |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_context_change, |
| "Set up evaluate context for LPM MEL change."); |
| xhci_dbg(xhci, "Slot %u Input Context:\n", udev->slot_id); |
| xhci_dbg_ctx(xhci, command->in_ctx, 0); |
| |
| /* Issue and wait for the evaluate context command. */ |
| ret = xhci_configure_endpoint(xhci, udev, command, |
| true, true); |
| xhci_dbg(xhci, "Slot %u Output Context:\n", udev->slot_id); |
| xhci_dbg_ctx(xhci, virt_dev->out_ctx, 0); |
| |
| if (!ret) { |
| spin_lock_irqsave(&xhci->lock, flags); |
| virt_dev->current_mel = max_exit_latency; |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| } |
| return ret; |
| } |
| |
| #ifdef CONFIG_PM |
| |
| /* BESL to HIRD Encoding array for USB2 LPM */ |
| static int xhci_besl_encoding[16] = {125, 150, 200, 300, 400, 500, 1000, 2000, |
| 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000}; |
| |
| /* Calculate HIRD/BESL for USB2 PORTPMSC*/ |
| static int xhci_calculate_hird_besl(struct xhci_hcd *xhci, |
| struct usb_device *udev) |
| { |
| int u2del, besl, besl_host; |
| int besl_device = 0; |
| u32 field; |
| |
| u2del = HCS_U2_LATENCY(xhci->hcs_params3); |
| field = le32_to_cpu(udev->bos->ext_cap->bmAttributes); |
| |
| if (field & USB_BESL_SUPPORT) { |
| for (besl_host = 0; besl_host < 16; besl_host++) { |
| if (xhci_besl_encoding[besl_host] >= u2del) |
| break; |
| } |
| /* Use baseline BESL value as default */ |
| if (field & USB_BESL_BASELINE_VALID) |
| besl_device = USB_GET_BESL_BASELINE(field); |
| else if (field & USB_BESL_DEEP_VALID) |
| besl_device = USB_GET_BESL_DEEP(field); |
| } else { |
| if (u2del <= 50) |
| besl_host = 0; |
| else |
| besl_host = (u2del - 51) / 75 + 1; |
| } |
| |
| besl = besl_host + besl_device; |
| if (besl > 15) |
| besl = 15; |
| |
| return besl; |
| } |
| |
| /* Calculate BESLD, L1 timeout and HIRDM for USB2 PORTHLPMC */ |
| static int xhci_calculate_usb2_hw_lpm_params(struct usb_device *udev) |
| { |
| u32 field; |
| int l1; |
| int besld = 0; |
| int hirdm = 0; |
| |
| field = le32_to_cpu(udev->bos->ext_cap->bmAttributes); |
| |
| /* xHCI l1 is set in steps of 256us, xHCI 1.0 section 5.4.11.2 */ |
| l1 = udev->l1_params.timeout / 256; |
| |
| /* device has preferred BESLD */ |
| if (field & USB_BESL_DEEP_VALID) { |
| besld = USB_GET_BESL_DEEP(field); |
| hirdm = 1; |
| } |
| |
| return PORT_BESLD(besld) | PORT_L1_TIMEOUT(l1) | PORT_HIRDM(hirdm); |
| } |
| |
| int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd, |
| struct usb_device *udev, int enable) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| __le32 __iomem **port_array; |
| __le32 __iomem *pm_addr, *hlpm_addr; |
| u32 pm_val, hlpm_val, field; |
| unsigned int port_num; |
| unsigned long flags; |
| int hird, exit_latency; |
| int ret; |
| |
| if (hcd->speed >= HCD_USB3 || !xhci->hw_lpm_support || |
| !udev->lpm_capable) |
| return -EPERM; |
| |
| if (!udev->parent || udev->parent->parent || |
| udev->descriptor.bDeviceClass == USB_CLASS_HUB) |
| return -EPERM; |
| |
| if (udev->usb2_hw_lpm_capable != 1) |
| return -EPERM; |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| |
| port_array = xhci->usb2_ports; |
| port_num = udev->portnum - 1; |
| pm_addr = port_array[port_num] + PORTPMSC; |
| pm_val = readl(pm_addr); |
| hlpm_addr = port_array[port_num] + PORTHLPMC; |
| field = le32_to_cpu(udev->bos->ext_cap->bmAttributes); |
| |
| xhci_dbg(xhci, "%s port %d USB2 hardware LPM\n", |
| enable ? "enable" : "disable", port_num + 1); |
| |
| if (enable) { |
| /* Host supports BESL timeout instead of HIRD */ |
| if (udev->usb2_hw_lpm_besl_capable) { |
| /* if device doesn't have a preferred BESL value use a |
| * default one which works with mixed HIRD and BESL |
| * systems. See XHCI_DEFAULT_BESL definition in xhci.h |
| */ |
| if ((field & USB_BESL_SUPPORT) && |
| (field & USB_BESL_BASELINE_VALID)) |
| hird = USB_GET_BESL_BASELINE(field); |
| else |
| hird = udev->l1_params.besl; |
| |
| exit_latency = xhci_besl_encoding[hird]; |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| /* USB 3.0 code dedicate one xhci->lpm_command->in_ctx |
| * input context for link powermanagement evaluate |
| * context commands. It is protected by hcd->bandwidth |
| * mutex and is shared by all devices. We need to set |
| * the max ext latency in USB 2 BESL LPM as well, so |
| * use the same mutex and xhci_change_max_exit_latency() |
| */ |
| mutex_lock(hcd->bandwidth_mutex); |
| ret = xhci_change_max_exit_latency(xhci, udev, |
| exit_latency); |
| mutex_unlock(hcd->bandwidth_mutex); |
| |
| if (ret < 0) |
| return ret; |
| spin_lock_irqsave(&xhci->lock, flags); |
| |
| hlpm_val = xhci_calculate_usb2_hw_lpm_params(udev); |
| writel(hlpm_val, hlpm_addr); |
| /* flush write */ |
| readl(hlpm_addr); |
| } else { |
| hird = xhci_calculate_hird_besl(xhci, udev); |
| } |
| |
| pm_val &= ~PORT_HIRD_MASK; |
| pm_val |= PORT_HIRD(hird) | PORT_RWE | PORT_L1DS(udev->slot_id); |
| writel(pm_val, pm_addr); |
| pm_val = readl(pm_addr); |
| pm_val |= PORT_HLE; |
| writel(pm_val, pm_addr); |
| /* flush write */ |
| readl(pm_addr); |
| } else { |
| pm_val &= ~(PORT_HLE | PORT_RWE | PORT_HIRD_MASK | PORT_L1DS_MASK); |
| writel(pm_val, pm_addr); |
| /* flush write */ |
| readl(pm_addr); |
| if (udev->usb2_hw_lpm_besl_capable) { |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| mutex_lock(hcd->bandwidth_mutex); |
| xhci_change_max_exit_latency(xhci, udev, 0); |
| mutex_unlock(hcd->bandwidth_mutex); |
| return 0; |
| } |
| } |
| |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return 0; |
| } |
| |
| /* check if a usb2 port supports a given extened capability protocol |
| * only USB2 ports extended protocol capability values are cached. |
| * Return 1 if capability is supported |
| */ |
| static int xhci_check_usb2_port_capability(struct xhci_hcd *xhci, int port, |
| unsigned capability) |
| { |
| u32 port_offset, port_count; |
| int i; |
| |
| for (i = 0; i < xhci->num_ext_caps; i++) { |
| if (xhci->ext_caps[i] & capability) { |
| /* port offsets starts at 1 */ |
| port_offset = XHCI_EXT_PORT_OFF(xhci->ext_caps[i]) - 1; |
| port_count = XHCI_EXT_PORT_COUNT(xhci->ext_caps[i]); |
| if (port >= port_offset && |
| port < port_offset + port_count) |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| int xhci_update_device(struct usb_hcd *hcd, struct usb_device *udev) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| int portnum = udev->portnum - 1; |
| |
| if (hcd->speed >= HCD_USB3 || !xhci->sw_lpm_support || |
| !udev->lpm_capable) |
| return 0; |
| |
| /* we only support lpm for non-hub device connected to root hub yet */ |
| if (!udev->parent || udev->parent->parent || |
| udev->descriptor.bDeviceClass == USB_CLASS_HUB) |
| return 0; |
| |
| if (xhci->hw_lpm_support == 1 && |
| xhci_check_usb2_port_capability( |
| xhci, portnum, XHCI_HLC)) { |
| udev->usb2_hw_lpm_capable = 1; |
| udev->l1_params.timeout = XHCI_L1_TIMEOUT; |
| udev->l1_params.besl = XHCI_DEFAULT_BESL; |
| if (xhci_check_usb2_port_capability(xhci, portnum, |
| XHCI_BLC)) |
| udev->usb2_hw_lpm_besl_capable = 1; |
| } |
| |
| return 0; |
| } |
| |
| /*---------------------- USB 3.0 Link PM functions ------------------------*/ |
| |
| /* Service interval in nanoseconds = 2^(bInterval - 1) * 125us * 1000ns / 1us */ |
| static unsigned long long xhci_service_interval_to_ns( |
| struct usb_endpoint_descriptor *desc) |
| { |
| return (1ULL << (desc->bInterval - 1)) * 125 * 1000; |
| } |
| |
| static u16 xhci_get_timeout_no_hub_lpm(struct usb_device *udev, |
| enum usb3_link_state state) |
| { |
| unsigned long long sel; |
| unsigned long long pel; |
| unsigned int max_sel_pel; |
| char *state_name; |
| |
| switch (state) { |
| case USB3_LPM_U1: |
| /* Convert SEL and PEL stored in nanoseconds to microseconds */ |
| sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); |
| pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); |
| max_sel_pel = USB3_LPM_MAX_U1_SEL_PEL; |
| state_name = "U1"; |
| break; |
| case USB3_LPM_U2: |
| sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); |
| pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); |
| max_sel_pel = USB3_LPM_MAX_U2_SEL_PEL; |
| state_name = "U2"; |
| break; |
| default: |
| dev_warn(&udev->dev, "%s: Can't get timeout for non-U1 or U2 state.\n", |
| __func__); |
| return USB3_LPM_DISABLED; |
| } |
| |
| if (sel <= max_sel_pel && pel <= max_sel_pel) |
| return USB3_LPM_DEVICE_INITIATED; |
| |
| if (sel > max_sel_pel) |
| dev_dbg(&udev->dev, "Device-initiated %s disabled " |
| "due to long SEL %llu ms\n", |
| state_name, sel); |
| else |
| dev_dbg(&udev->dev, "Device-initiated %s disabled " |
| "due to long PEL %llu ms\n", |
| state_name, pel); |
| return USB3_LPM_DISABLED; |
| } |
| |
| /* The U1 timeout should be the maximum of the following values: |
| * - For control endpoints, U1 system exit latency (SEL) * 3 |
| * - For bulk endpoints, U1 SEL * 5 |
| * - For interrupt endpoints: |
| * - Notification EPs, U1 SEL * 3 |
| * - Periodic EPs, max(105% of bInterval, U1 SEL * 2) |
| * - For isochronous endpoints, max(105% of bInterval, U1 SEL * 2) |
| */ |
| static unsigned long long xhci_calculate_intel_u1_timeout( |
| struct usb_device *udev, |
| struct usb_endpoint_descriptor *desc) |
| { |
| unsigned long long timeout_ns; |
| int ep_type; |
| int intr_type; |
| |
| ep_type = usb_endpoint_type(desc); |
| switch (ep_type) { |
| case USB_ENDPOINT_XFER_CONTROL: |
| timeout_ns = udev->u1_params.sel * 3; |
| break; |
| case USB_ENDPOINT_XFER_BULK: |
| timeout_ns = udev->u1_params.sel * 5; |
| break; |
| case USB_ENDPOINT_XFER_INT: |
| intr_type = usb_endpoint_interrupt_type(desc); |
| if (intr_type == USB_ENDPOINT_INTR_NOTIFICATION) { |
| timeout_ns = udev->u1_params.sel * 3; |
| break; |
| } |
| /* Otherwise the calculation is the same as isoc eps */ |
| case USB_ENDPOINT_XFER_ISOC: |
| timeout_ns = xhci_service_interval_to_ns(desc); |
| timeout_ns = DIV_ROUND_UP_ULL(timeout_ns * 105, 100); |
| if (timeout_ns < udev->u1_params.sel * 2) |
| timeout_ns = udev->u1_params.sel * 2; |
| break; |
| default: |
| return 0; |
| } |
| |
| return timeout_ns; |
| } |
| |
| /* Returns the hub-encoded U1 timeout value. */ |
| static u16 xhci_calculate_u1_timeout(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| struct usb_endpoint_descriptor *desc) |
| { |
| unsigned long long timeout_ns; |
| |
| if (xhci->quirks & XHCI_INTEL_HOST) |
| timeout_ns = xhci_calculate_intel_u1_timeout(udev, desc); |
| else |
| timeout_ns = udev->u1_params.sel; |
| |
| /* The U1 timeout is encoded in 1us intervals. |
| * Don't return a timeout of zero, because that's USB3_LPM_DISABLED. |
| */ |
| if (timeout_ns == USB3_LPM_DISABLED) |
| timeout_ns = 1; |
| else |
| timeout_ns = DIV_ROUND_UP_ULL(timeout_ns, 1000); |
| |
| /* If the necessary timeout value is bigger than what we can set in the |
| * USB 3.0 hub, we have to disable hub-initiated U1. |
| */ |
| if (timeout_ns <= USB3_LPM_U1_MAX_TIMEOUT) |
| return timeout_ns; |
| dev_dbg(&udev->dev, "Hub-initiated U1 disabled " |
| "due to long timeout %llu ms\n", timeout_ns); |
| return xhci_get_timeout_no_hub_lpm(udev, USB3_LPM_U1); |
| } |
| |
| /* The U2 timeout should be the maximum of: |
| * - 10 ms (to avoid the bandwidth impact on the scheduler) |
| * - largest bInterval of any active periodic endpoint (to avoid going |
| * into lower power link states between intervals). |
| * - the U2 Exit Latency of the device |
| */ |
| static unsigned long long xhci_calculate_intel_u2_timeout( |
| struct usb_device *udev, |
| struct usb_endpoint_descriptor *desc) |
| { |
| unsigned long long timeout_ns; |
| unsigned long long u2_del_ns; |
| |
| timeout_ns = 10 * 1000 * 1000; |
| |
| if ((usb_endpoint_xfer_int(desc) || usb_endpoint_xfer_isoc(desc)) && |
| (xhci_service_interval_to_ns(desc) > timeout_ns)) |
| timeout_ns = xhci_service_interval_to_ns(desc); |
| |
| u2_del_ns = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat) * 1000ULL; |
| if (u2_del_ns > timeout_ns) |
| timeout_ns = u2_del_ns; |
| |
| return timeout_ns; |
| } |
| |
| /* Returns the hub-encoded U2 timeout value. */ |
| static u16 xhci_calculate_u2_timeout(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| struct usb_endpoint_descriptor *desc) |
| { |
| unsigned long long timeout_ns; |
| |
| if (xhci->quirks & XHCI_INTEL_HOST) |
| timeout_ns = xhci_calculate_intel_u2_timeout(udev, desc); |
| else |
| timeout_ns = udev->u2_params.sel; |
| |
| /* The U2 timeout is encoded in 256us intervals */ |
| timeout_ns = DIV_ROUND_UP_ULL(timeout_ns, 256 * 1000); |
| /* If the necessary timeout value is bigger than what we can set in the |
| * USB 3.0 hub, we have to disable hub-initiated U2. |
| */ |
| if (timeout_ns <= USB3_LPM_U2_MAX_TIMEOUT) |
| return timeout_ns; |
| dev_dbg(&udev->dev, "Hub-initiated U2 disabled " |
| "due to long timeout %llu ms\n", timeout_ns); |
| return xhci_get_timeout_no_hub_lpm(udev, USB3_LPM_U2); |
| } |
| |
| static u16 xhci_call_host_update_timeout_for_endpoint(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| struct usb_endpoint_descriptor *desc, |
| enum usb3_link_state state, |
| u16 *timeout) |
| { |
| if (state == USB3_LPM_U1) |
| return xhci_calculate_u1_timeout(xhci, udev, desc); |
| else if (state == USB3_LPM_U2) |
| return xhci_calculate_u2_timeout(xhci, udev, desc); |
| |
| return USB3_LPM_DISABLED; |
| } |
| |
| static int xhci_update_timeout_for_endpoint(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| struct usb_endpoint_descriptor *desc, |
| enum usb3_link_state state, |
| u16 *timeout) |
| { |
| u16 alt_timeout; |
| |
| alt_timeout = xhci_call_host_update_timeout_for_endpoint(xhci, udev, |
| desc, state, timeout); |
| |
| /* If we found we can't enable hub-initiated LPM, or |
| * the U1 or U2 exit latency was too high to allow |
| * device-initiated LPM as well, just stop searching. |
| */ |
| if (alt_timeout == USB3_LPM_DISABLED || |
| alt_timeout == USB3_LPM_DEVICE_INITIATED) { |
| *timeout = alt_timeout; |
| return -E2BIG; |
| } |
| if (alt_timeout > *timeout) |
| *timeout = alt_timeout; |
| return 0; |
| } |
| |
| static int xhci_update_timeout_for_interface(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| struct usb_host_interface *alt, |
| enum usb3_link_state state, |
| u16 *timeout) |
| { |
| int j; |
| |
| for (j = 0; j < alt->desc.bNumEndpoints; j++) { |
| if (xhci_update_timeout_for_endpoint(xhci, udev, |
| &alt->endpoint[j].desc, state, timeout)) |
| return -E2BIG; |
| continue; |
| } |
| return 0; |
| } |
| |
| static int xhci_check_intel_tier_policy(struct usb_device *udev, |
| enum usb3_link_state state) |
| { |
| struct usb_device *parent; |
| unsigned int num_hubs; |
| |
| if (state == USB3_LPM_U2) |
| return 0; |
| |
| /* Don't enable U1 if the device is on a 2nd tier hub or lower. */ |
| for (parent = udev->parent, num_hubs = 0; parent->parent; |
| parent = parent->parent) |
| num_hubs++; |
| |
| if (num_hubs < 2) |
| return 0; |
| |
| dev_dbg(&udev->dev, "Disabling U1 link state for device" |
| " below second-tier hub.\n"); |
| dev_dbg(&udev->dev, "Plug device into first-tier hub " |
| "to decrease power consumption.\n"); |
| return -E2BIG; |
| } |
| |
| static int xhci_check_tier_policy(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| enum usb3_link_state state) |
| { |
| if (xhci->quirks & XHCI_INTEL_HOST) |
| return xhci_check_intel_tier_policy(udev, state); |
| else |
| return 0; |
| } |
| |
| /* Returns the U1 or U2 timeout that should be enabled. |
| * If the tier check or timeout setting functions return with a non-zero exit |
| * code, that means the timeout value has been finalized and we shouldn't look |
| * at any more endpoints. |
| */ |
| static u16 xhci_calculate_lpm_timeout(struct usb_hcd *hcd, |
| struct usb_device *udev, enum usb3_link_state state) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| struct usb_host_config *config; |
| char *state_name; |
| int i; |
| u16 timeout = USB3_LPM_DISABLED; |
| |
| if (state == USB3_LPM_U1) |
| state_name = "U1"; |
| else if (state == USB3_LPM_U2) |
| state_name = "U2"; |
| else { |
| dev_warn(&udev->dev, "Can't enable unknown link state %i\n", |
| state); |
| return timeout; |
| } |
| |
| if (xhci_check_tier_policy(xhci, udev, state) < 0) |
| return timeout; |
| |
| /* Gather some information about the currently installed configuration |
| * and alternate interface settings. |
| */ |
| if (xhci_update_timeout_for_endpoint(xhci, udev, &udev->ep0.desc, |
| state, &timeout)) |
| return timeout; |
| |
| config = udev->actconfig; |
| if (!config) |
| return timeout; |
| |
| for (i = 0; i < config->desc.bNumInterfaces; i++) { |
| struct usb_driver *driver; |
| struct usb_interface *intf = config->interface[i]; |
| |
| if (!intf) |
| continue; |
| |
| /* Check if any currently bound drivers want hub-initiated LPM |
| * disabled. |
| */ |
| if (intf->dev.driver) { |
| driver = to_usb_driver(intf->dev.driver); |
| if (driver && driver->disable_hub_initiated_lpm) { |
| dev_dbg(&udev->dev, "Hub-initiated %s disabled " |
| "at request of driver %s\n", |
| state_name, driver->name); |
| return xhci_get_timeout_no_hub_lpm(udev, state); |
| } |
| } |
| |
| /* Not sure how this could happen... */ |
| if (!intf->cur_altsetting) |
| continue; |
| |
| if (xhci_update_timeout_for_interface(xhci, udev, |
| intf->cur_altsetting, |
| state, &timeout)) |
| return timeout; |
| } |
| return timeout; |
| } |
| |
| static int calculate_max_exit_latency(struct usb_device *udev, |
| enum usb3_link_state state_changed, |
| u16 hub_encoded_timeout) |
| { |
| unsigned long long u1_mel_us = 0; |
| unsigned long long u2_mel_us = 0; |
| unsigned long long mel_us = 0; |
| bool disabling_u1; |
| bool disabling_u2; |
| bool enabling_u1; |
| bool enabling_u2; |
| |
| disabling_u1 = (state_changed == USB3_LPM_U1 && |
| hub_encoded_timeout == USB3_LPM_DISABLED); |
| disabling_u2 = (state_changed == USB3_LPM_U2 && |
| hub_encoded_timeout == USB3_LPM_DISABLED); |
| |
| enabling_u1 = (state_changed == USB3_LPM_U1 && |
| hub_encoded_timeout != USB3_LPM_DISABLED); |
| enabling_u2 = (state_changed == USB3_LPM_U2 && |
| hub_encoded_timeout != USB3_LPM_DISABLED); |
| |
| /* If U1 was already enabled and we're not disabling it, |
| * or we're going to enable U1, account for the U1 max exit latency. |
| */ |
| if ((udev->u1_params.timeout != USB3_LPM_DISABLED && !disabling_u1) || |
| enabling_u1) |
| u1_mel_us = DIV_ROUND_UP(udev->u1_params.mel, 1000); |
| if ((udev->u2_params.timeout != USB3_LPM_DISABLED && !disabling_u2) || |
| enabling_u2) |
| u2_mel_us = DIV_ROUND_UP(udev->u2_params.mel, 1000); |
| |
| if (u1_mel_us > u2_mel_us) |
| mel_us = u1_mel_us; |
| else |
| mel_us = u2_mel_us; |
| /* xHCI host controller max exit latency field is only 16 bits wide. */ |
| if (mel_us > MAX_EXIT) { |
| dev_warn(&udev->dev, "Link PM max exit latency of %lluus " |
| "is too big.\n", mel_us); |
| return -E2BIG; |
| } |
| return mel_us; |
| } |
| |
| /* Returns the USB3 hub-encoded value for the U1/U2 timeout. */ |
| int xhci_enable_usb3_lpm_timeout(struct usb_hcd *hcd, |
| struct usb_device *udev, enum usb3_link_state state) |
| { |
| struct xhci_hcd *xhci; |
| u16 hub_encoded_timeout; |
| int mel; |
| int ret; |
| |
| xhci = hcd_to_xhci(hcd); |
| /* The LPM timeout values are pretty host-controller specific, so don't |
| * enable hub-initiated timeouts unless the vendor has provided |
| * information about their timeout algorithm. |
| */ |
| if (!xhci || !(xhci->quirks & XHCI_LPM_SUPPORT) || |
| !xhci->devs[udev->slot_id]) |
| return USB3_LPM_DISABLED; |
| |
| hub_encoded_timeout = xhci_calculate_lpm_timeout(hcd, udev, state); |
| mel = calculate_max_exit_latency(udev, state, hub_encoded_timeout); |
| if (mel < 0) { |
| /* Max Exit Latency is too big, disable LPM. */ |
| hub_encoded_timeout = USB3_LPM_DISABLED; |
| mel = 0; |
| } |
| |
| ret = xhci_change_max_exit_latency(xhci, udev, mel); |
| if (ret) |
| return ret; |
| return hub_encoded_timeout; |
| } |
| |
| int xhci_disable_usb3_lpm_timeout(struct usb_hcd *hcd, |
| struct usb_device *udev, enum usb3_link_state state) |
| { |
| struct xhci_hcd *xhci; |
| u16 mel; |
| |
| xhci = hcd_to_xhci(hcd); |
| if (!xhci || !(xhci->quirks & XHCI_LPM_SUPPORT) || |
| !xhci->devs[udev->slot_id]) |
| return 0; |
| |
| mel = calculate_max_exit_latency(udev, state, USB3_LPM_DISABLED); |
| return xhci_change_max_exit_latency(xhci, udev, mel); |
| } |
| #else /* CONFIG_PM */ |
| |
| int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd, |
| struct usb_device *udev, int enable) |
| { |
| return 0; |
| } |
| |
| int xhci_update_device(struct usb_hcd *hcd, struct usb_device *udev) |
| { |
| return 0; |
| } |
| |
| int xhci_enable_usb3_lpm_timeout(struct usb_hcd *hcd, |
| struct usb_device *udev, enum usb3_link_state state) |
| { |
| return USB3_LPM_DISABLED; |
| } |
| |
| int xhci_disable_usb3_lpm_timeout(struct usb_hcd *hcd, |
| struct usb_device *udev, enum usb3_link_state state) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_PM */ |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* Once a hub descriptor is fetched for a device, we need to update the xHC's |
| * internal data structures for the device. |
| */ |
| int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev, |
| struct usb_tt *tt, gfp_t mem_flags) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| struct xhci_virt_device *vdev; |
| struct xhci_command *config_cmd; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| struct xhci_slot_ctx *slot_ctx; |
| unsigned long flags; |
| unsigned think_time; |
| int ret; |
| |
| /* Ignore root hubs */ |
| if (!hdev->parent) |
| return 0; |
| |
| vdev = xhci->devs[hdev->slot_id]; |
| if (!vdev) { |
| xhci_warn(xhci, "Cannot update hub desc for unknown device.\n"); |
| return -EINVAL; |
| } |
| config_cmd = xhci_alloc_command(xhci, true, true, mem_flags); |
| if (!config_cmd) { |
| xhci_dbg(xhci, "Could not allocate xHCI command structure.\n"); |
| return -ENOMEM; |
| } |
| ctrl_ctx = xhci_get_input_control_ctx(config_cmd->in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "%s: Could not get input context, bad type.\n", |
| __func__); |
| xhci_free_command(xhci, config_cmd); |
| return -ENOMEM; |
| } |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| if (hdev->speed == USB_SPEED_HIGH && |
| xhci_alloc_tt_info(xhci, vdev, hdev, tt, GFP_ATOMIC)) { |
| xhci_dbg(xhci, "Could not allocate xHCI TT structure.\n"); |
| xhci_free_command(xhci, config_cmd); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return -ENOMEM; |
| } |
| |
| xhci_slot_copy(xhci, config_cmd->in_ctx, vdev->out_ctx); |
| ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG); |
| slot_ctx = xhci_get_slot_ctx(xhci, config_cmd->in_ctx); |
| slot_ctx->dev_info |= cpu_to_le32(DEV_HUB); |
| /* |
| * refer to section 6.2.2: MTT should be 0 for full speed hub, |
| * but it may be already set to 1 when setup an xHCI virtual |
| * device, so clear it anyway. |
| */ |
| if (tt->multi) |
| slot_ctx->dev_info |= cpu_to_le32(DEV_MTT); |
| else if (hdev->speed == USB_SPEED_FULL) |
| slot_ctx->dev_info &= cpu_to_le32(~DEV_MTT); |
| |
| if (xhci->hci_version > 0x95) { |
| xhci_dbg(xhci, "xHCI version %x needs hub " |
| "TT think time and number of ports\n", |
| (unsigned int) xhci->hci_version); |
| slot_ctx->dev_info2 |= cpu_to_le32(XHCI_MAX_PORTS(hdev->maxchild)); |
| /* Set TT think time - convert from ns to FS bit times. |
| * 0 = 8 FS bit times, 1 = 16 FS bit times, |
| * 2 = 24 FS bit times, 3 = 32 FS bit times. |
| * |
| * xHCI 1.0: this field shall be 0 if the device is not a |
| * High-spped hub. |
| */ |
| think_time = tt->think_time; |
| if (think_time != 0) |
| think_time = (think_time / 666) - 1; |
| if (xhci->hci_version < 0x100 || hdev->speed == USB_SPEED_HIGH) |
| slot_ctx->tt_info |= |
| cpu_to_le32(TT_THINK_TIME(think_time)); |
| } else { |
| xhci_dbg(xhci, "xHCI version %x doesn't need hub " |
| "TT think time or number of ports\n", |
| (unsigned int) xhci->hci_version); |
| } |
| slot_ctx->dev_state = 0; |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| xhci_dbg(xhci, "Set up %s for hub device.\n", |
| (xhci->hci_version > 0x95) ? |
| "configure endpoint" : "evaluate context"); |
| xhci_dbg(xhci, "Slot %u Input Context:\n", hdev->slot_id); |
| xhci_dbg_ctx(xhci, config_cmd->in_ctx, 0); |
| |
| /* Issue and wait for the configure endpoint or |
| * evaluate context command. |
| */ |
| if (xhci->hci_version > 0x95) |
| ret = xhci_configure_endpoint(xhci, hdev, config_cmd, |
| false, false); |
| else |
| ret = xhci_configure_endpoint(xhci, hdev, config_cmd, |
| true, false); |
| |
| xhci_dbg(xhci, "Slot %u Output Context:\n", hdev->slot_id); |
| xhci_dbg_ctx(xhci, vdev->out_ctx, 0); |
| |
| xhci_free_command(xhci, config_cmd); |
| return ret; |
| } |
| |
| int xhci_get_frame(struct usb_hcd *hcd) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| /* EHCI mods by the periodic size. Why? */ |
| return readl(&xhci->run_regs->microframe_index) >> 3; |
| } |
| |
| int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) |
| { |
| struct xhci_hcd *xhci; |
| struct device *dev = hcd->self.controller; |
| int retval; |
| |
| /* Accept arbitrarily long scatter-gather lists */ |
| hcd->self.sg_tablesize = ~0; |
| |
| /* support to build packet from discontinuous buffers */ |
| hcd->self.no_sg_constraint = 1; |
| |
| /* XHCI controllers don't stop the ep queue on short packets :| */ |
| hcd->self.no_stop_on_short = 1; |
| |
| xhci = hcd_to_xhci(hcd); |
| |
| if (usb_hcd_is_primary_hcd(hcd)) { |
| xhci->main_hcd = hcd; |
| /* Mark the first roothub as being USB 2.0. |
| * The xHCI driver will register the USB 3.0 roothub. |
| */ |
| hcd->speed = HCD_USB2; |
| hcd->self.root_hub->speed = USB_SPEED_HIGH; |
| /* |
| * USB 2.0 roothub under xHCI has an integrated TT, |
| * (rate matching hub) as opposed to having an OHCI/UHCI |
| * companion controller. |
| */ |
| hcd->has_tt = 1; |
| } else { |
| if (xhci->sbrn == 0x31) { |
| xhci_info(xhci, "Host supports USB 3.1 Enhanced SuperSpeed\n"); |
| hcd->speed = HCD_USB31; |
| } |
| /* xHCI private pointer was set in xhci_pci_probe for the second |
| * registered roothub. |
| */ |
| return 0; |
| } |
| |
| mutex_init(&xhci->mutex); |
| xhci->cap_regs = hcd->regs; |
| xhci->op_regs = hcd->regs + |
| HC_LENGTH(readl(&xhci->cap_regs->hc_capbase)); |
| xhci->run_regs = hcd->regs + |
| (readl(&xhci->cap_regs->run_regs_off) & RTSOFF_MASK); |
| /* Cache read-only capability registers */ |
| xhci->hcs_params1 = readl(&xhci->cap_regs->hcs_params1); |
| xhci->hcs_params2 = readl(&xhci->cap_regs->hcs_params2); |
| xhci->hcs_params3 = readl(&xhci->cap_regs->hcs_params3); |
| xhci->hcc_params = readl(&xhci->cap_regs->hc_capbase); |
| xhci->hci_version = HC_VERSION(xhci->hcc_params); |
| xhci->hcc_params = readl(&xhci->cap_regs->hcc_params); |
| if (xhci->hci_version > 0x100) |
| xhci->hcc_params2 = readl(&xhci->cap_regs->hcc_params2); |
| xhci_print_registers(xhci); |
| |
| xhci->quirks = quirks; |
| |
| get_quirks(dev, xhci); |
| |
| /* In xhci controllers which follow xhci 1.0 spec gives a spurious |
| * success event after a short transfer. This quirk will ignore such |
| * spurious event. |
| */ |
| if (xhci->hci_version > 0x96) |
| xhci->quirks |= XHCI_SPURIOUS_SUCCESS; |
| |
| /* Make sure the HC is halted. */ |
| retval = xhci_halt(xhci); |
| if (retval) |
| return retval; |
| |
| xhci_dbg(xhci, "Resetting HCD\n"); |
| /* Reset the internal HC memory state and registers. */ |
| retval = xhci_reset(xhci); |
| if (retval) |
| return retval; |
| xhci_dbg(xhci, "Reset complete\n"); |
| |
| /* Set dma_mask and coherent_dma_mask to 64-bits, |
| * if xHC supports 64-bit addressing */ |
| if (HCC_64BIT_ADDR(xhci->hcc_params) && |
| !dma_set_mask(dev, DMA_BIT_MASK(64))) { |
| xhci_dbg(xhci, "Enabling 64-bit DMA addresses.\n"); |
| dma_set_coherent_mask(dev, DMA_BIT_MASK(64)); |
| } else { |
| /* |
| * This is to avoid error in cases where a 32-bit USB |
| * controller is used on a 64-bit capable system. |
| */ |
| retval = dma_set_mask(dev, DMA_BIT_MASK(32)); |
| if (retval) |
| return retval; |
| xhci_dbg(xhci, "Enabling 32-bit DMA addresses.\n"); |
| dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); |
| } |
| |
| xhci_dbg(xhci, "Calling HCD init\n"); |
| /* Initialize HCD and host controller data structures. */ |
| retval = xhci_init(hcd); |
| if (retval) |
| return retval; |
| xhci_dbg(xhci, "Called HCD init\n"); |
| |
| xhci_info(xhci, "hcc params 0x%08x hci version 0x%x quirks 0x%08x\n", |
| xhci->hcc_params, xhci->hci_version, xhci->quirks); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(xhci_gen_setup); |
| |
| static const struct hc_driver xhci_hc_driver = { |
| .description = "xhci-hcd", |
| .product_desc = "xHCI Host Controller", |
| .hcd_priv_size = sizeof(struct xhci_hcd *), |
| |
| /* |
| * generic hardware linkage |
| */ |
| .irq = xhci_irq, |
| .flags = HCD_MEMORY | HCD_USB3 | HCD_SHARED, |
| |
| /* |
| * basic lifecycle operations |
| */ |
| .reset = NULL, /* set in xhci_init_driver() */ |
| .start = xhci_run, |
| .stop = xhci_stop, |
| .shutdown = xhci_shutdown, |
| |
| /* |
| * managing i/o requests and associated device resources |
| */ |
| .urb_enqueue = xhci_urb_enqueue, |
| .urb_dequeue = xhci_urb_dequeue, |
| .alloc_dev = xhci_alloc_dev, |
| .free_dev = xhci_free_dev, |
| .alloc_streams = xhci_alloc_streams, |
| .free_streams = xhci_free_streams, |
| .add_endpoint = xhci_add_endpoint, |
| .drop_endpoint = xhci_drop_endpoint, |
| .endpoint_reset = xhci_endpoint_reset, |
| .check_bandwidth = xhci_check_bandwidth, |
| .reset_bandwidth = xhci_reset_bandwidth, |
| .address_device = xhci_address_device, |
| .enable_device = xhci_enable_device, |
| .update_hub_device = xhci_update_hub_device, |
| .reset_device = xhci_discover_or_reset_device, |
| |
| /* |
| * scheduling support |
| */ |
| .get_frame_number = xhci_get_frame, |
| |
| /* |
| * root hub support |
| */ |
| .hub_control = xhci_hub_control, |
| .hub_status_data = xhci_hub_status_data, |
| .bus_suspend = xhci_bus_suspend, |
| .bus_resume = xhci_bus_resume, |
| |
| /* |
| * call back when device connected and addressed |
| */ |
| .update_device = xhci_update_device, |
| .set_usb2_hw_lpm = xhci_set_usb2_hardware_lpm, |
| .enable_usb3_lpm_timeout = xhci_enable_usb3_lpm_timeout, |
| .disable_usb3_lpm_timeout = xhci_disable_usb3_lpm_timeout, |
| .find_raw_port_number = xhci_find_raw_port_number, |
| }; |
| |
| void xhci_init_driver(struct hc_driver *drv, |
| const struct xhci_driver_overrides *over) |
| { |
| BUG_ON(!over); |
| |
| /* Copy the generic table to drv then apply the overrides */ |
| *drv = xhci_hc_driver; |
| |
| if (over) { |
| drv->hcd_priv_size += over->extra_priv_size; |
| if (over->reset) |
| drv->reset = over->reset; |
| if (over->start) |
| drv->start = over->start; |
| } |
| } |
| EXPORT_SYMBOL_GPL(xhci_init_driver); |
| |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_AUTHOR(DRIVER_AUTHOR); |
| MODULE_LICENSE("GPL"); |
| |
| static int __init xhci_hcd_init(void) |
| { |
| /* |
| * Check the compiler generated sizes of structures that must be laid |
| * out in specific ways for hardware access. |
| */ |
| BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8); |
| BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8); |
| BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8); |
| /* xhci_device_control has eight fields, and also |
| * embeds one xhci_slot_ctx and 31 xhci_ep_ctx |
| */ |
| BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8); |
| BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8); |
| BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8); |
| BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 8*32/8); |
| BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8); |
| /* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */ |
| BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8); |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| return 0; |
| } |
| |
| /* |
| * If an init function is provided, an exit function must also be provided |
| * to allow module unload. |
| */ |
| static void __exit xhci_hcd_fini(void) { } |
| |
| module_init(xhci_hcd_init); |
| module_exit(xhci_hcd_fini); |
