| /* |
| * PCI Bus Services, see include/linux/pci.h for further explanation. |
| * |
| * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter, |
| * David Mosberger-Tang |
| * |
| * Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/of.h> |
| #include <linux/of_pci.h> |
| #include <linux/pci.h> |
| #include <linux/pm.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/spinlock.h> |
| #include <linux/string.h> |
| #include <linux/log2.h> |
| #include <linux/pci-aspm.h> |
| #include <linux/pm_wakeup.h> |
| #include <linux/interrupt.h> |
| #include <linux/device.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/pci_hotplug.h> |
| #include <asm-generic/pci-bridge.h> |
| #include <asm/setup.h> |
| #include <linux/aer.h> |
| #include "pci.h" |
| |
| const char *pci_power_names[] = { |
| "error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown", |
| }; |
| EXPORT_SYMBOL_GPL(pci_power_names); |
| |
| int isa_dma_bridge_buggy; |
| EXPORT_SYMBOL(isa_dma_bridge_buggy); |
| |
| int pci_pci_problems; |
| EXPORT_SYMBOL(pci_pci_problems); |
| |
| unsigned int pci_pm_d3_delay; |
| |
| static void pci_pme_list_scan(struct work_struct *work); |
| |
| static LIST_HEAD(pci_pme_list); |
| static DEFINE_MUTEX(pci_pme_list_mutex); |
| static DECLARE_DELAYED_WORK(pci_pme_work, pci_pme_list_scan); |
| |
| struct pci_pme_device { |
| struct list_head list; |
| struct pci_dev *dev; |
| }; |
| |
| #define PME_TIMEOUT 1000 /* How long between PME checks */ |
| |
| static void pci_dev_d3_sleep(struct pci_dev *dev) |
| { |
| unsigned int delay = dev->d3_delay; |
| |
| if (delay < pci_pm_d3_delay) |
| delay = pci_pm_d3_delay; |
| |
| msleep(delay); |
| } |
| |
| #ifdef CONFIG_PCI_DOMAINS |
| int pci_domains_supported = 1; |
| #endif |
| |
| #define DEFAULT_CARDBUS_IO_SIZE (256) |
| #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024) |
| /* pci=cbmemsize=nnM,cbiosize=nn can override this */ |
| unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE; |
| unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE; |
| |
| #define DEFAULT_HOTPLUG_IO_SIZE (256) |
| #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024) |
| /* pci=hpmemsize=nnM,hpiosize=nn can override this */ |
| unsigned long pci_hotplug_io_size = DEFAULT_HOTPLUG_IO_SIZE; |
| unsigned long pci_hotplug_mem_size = DEFAULT_HOTPLUG_MEM_SIZE; |
| |
| enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_DEFAULT; |
| |
| /* |
| * The default CLS is used if arch didn't set CLS explicitly and not |
| * all pci devices agree on the same value. Arch can override either |
| * the dfl or actual value as it sees fit. Don't forget this is |
| * measured in 32-bit words, not bytes. |
| */ |
| u8 pci_dfl_cache_line_size = L1_CACHE_BYTES >> 2; |
| u8 pci_cache_line_size; |
| |
| /* |
| * If we set up a device for bus mastering, we need to check the latency |
| * timer as certain BIOSes forget to set it properly. |
| */ |
| unsigned int pcibios_max_latency = 255; |
| |
| /* If set, the PCIe ARI capability will not be used. */ |
| static bool pcie_ari_disabled; |
| |
| /** |
| * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children |
| * @bus: pointer to PCI bus structure to search |
| * |
| * Given a PCI bus, returns the highest PCI bus number present in the set |
| * including the given PCI bus and its list of child PCI buses. |
| */ |
| unsigned char pci_bus_max_busnr(struct pci_bus *bus) |
| { |
| struct pci_bus *tmp; |
| unsigned char max, n; |
| |
| max = bus->busn_res.end; |
| list_for_each_entry(tmp, &bus->children, node) { |
| n = pci_bus_max_busnr(tmp); |
| if (n > max) |
| max = n; |
| } |
| return max; |
| } |
| EXPORT_SYMBOL_GPL(pci_bus_max_busnr); |
| |
| #ifdef CONFIG_HAS_IOMEM |
| void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) |
| { |
| struct resource *res = &pdev->resource[bar]; |
| |
| /* |
| * Make sure the BAR is actually a memory resource, not an IO resource |
| */ |
| if (res->flags & IORESOURCE_UNSET || !(res->flags & IORESOURCE_MEM)) { |
| dev_warn(&pdev->dev, "can't ioremap BAR %d: %pR\n", bar, res); |
| return NULL; |
| } |
| return ioremap_nocache(res->start, resource_size(res)); |
| } |
| EXPORT_SYMBOL_GPL(pci_ioremap_bar); |
| |
| void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar) |
| { |
| /* |
| * Make sure the BAR is actually a memory resource, not an IO resource |
| */ |
| if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) { |
| WARN_ON(1); |
| return NULL; |
| } |
| return ioremap_wc(pci_resource_start(pdev, bar), |
| pci_resource_len(pdev, bar)); |
| } |
| EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar); |
| #endif |
| |
| |
| static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn, |
| u8 pos, int cap, int *ttl) |
| { |
| u8 id; |
| u16 ent; |
| |
| pci_bus_read_config_byte(bus, devfn, pos, &pos); |
| |
| while ((*ttl)--) { |
| if (pos < 0x40) |
| break; |
| pos &= ~3; |
| pci_bus_read_config_word(bus, devfn, pos, &ent); |
| |
| id = ent & 0xff; |
| if (id == 0xff) |
| break; |
| if (id == cap) |
| return pos; |
| pos = (ent >> 8); |
| } |
| return 0; |
| } |
| |
| static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn, |
| u8 pos, int cap) |
| { |
| int ttl = PCI_FIND_CAP_TTL; |
| |
| return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl); |
| } |
| |
| int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap) |
| { |
| return __pci_find_next_cap(dev->bus, dev->devfn, |
| pos + PCI_CAP_LIST_NEXT, cap); |
| } |
| EXPORT_SYMBOL_GPL(pci_find_next_capability); |
| |
| static int __pci_bus_find_cap_start(struct pci_bus *bus, |
| unsigned int devfn, u8 hdr_type) |
| { |
| u16 status; |
| |
| pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status); |
| if (!(status & PCI_STATUS_CAP_LIST)) |
| return 0; |
| |
| switch (hdr_type) { |
| case PCI_HEADER_TYPE_NORMAL: |
| case PCI_HEADER_TYPE_BRIDGE: |
| return PCI_CAPABILITY_LIST; |
| case PCI_HEADER_TYPE_CARDBUS: |
| return PCI_CB_CAPABILITY_LIST; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * pci_find_capability - query for devices' capabilities |
| * @dev: PCI device to query |
| * @cap: capability code |
| * |
| * Tell if a device supports a given PCI capability. |
| * Returns the address of the requested capability structure within the |
| * device's PCI configuration space or 0 in case the device does not |
| * support it. Possible values for @cap: |
| * |
| * %PCI_CAP_ID_PM Power Management |
| * %PCI_CAP_ID_AGP Accelerated Graphics Port |
| * %PCI_CAP_ID_VPD Vital Product Data |
| * %PCI_CAP_ID_SLOTID Slot Identification |
| * %PCI_CAP_ID_MSI Message Signalled Interrupts |
| * %PCI_CAP_ID_CHSWP CompactPCI HotSwap |
| * %PCI_CAP_ID_PCIX PCI-X |
| * %PCI_CAP_ID_EXP PCI Express |
| */ |
| int pci_find_capability(struct pci_dev *dev, int cap) |
| { |
| int pos; |
| |
| pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); |
| if (pos) |
| pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap); |
| |
| return pos; |
| } |
| EXPORT_SYMBOL(pci_find_capability); |
| |
| /** |
| * pci_bus_find_capability - query for devices' capabilities |
| * @bus: the PCI bus to query |
| * @devfn: PCI device to query |
| * @cap: capability code |
| * |
| * Like pci_find_capability() but works for pci devices that do not have a |
| * pci_dev structure set up yet. |
| * |
| * Returns the address of the requested capability structure within the |
| * device's PCI configuration space or 0 in case the device does not |
| * support it. |
| */ |
| int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap) |
| { |
| int pos; |
| u8 hdr_type; |
| |
| pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type); |
| |
| pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f); |
| if (pos) |
| pos = __pci_find_next_cap(bus, devfn, pos, cap); |
| |
| return pos; |
| } |
| EXPORT_SYMBOL(pci_bus_find_capability); |
| |
| /** |
| * pci_find_next_ext_capability - Find an extended capability |
| * @dev: PCI device to query |
| * @start: address at which to start looking (0 to start at beginning of list) |
| * @cap: capability code |
| * |
| * Returns the address of the next matching extended capability structure |
| * within the device's PCI configuration space or 0 if the device does |
| * not support it. Some capabilities can occur several times, e.g., the |
| * vendor-specific capability, and this provides a way to find them all. |
| */ |
| int pci_find_next_ext_capability(struct pci_dev *dev, int start, int cap) |
| { |
| u32 header; |
| int ttl; |
| int pos = PCI_CFG_SPACE_SIZE; |
| |
| /* minimum 8 bytes per capability */ |
| ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; |
| |
| if (dev->cfg_size <= PCI_CFG_SPACE_SIZE) |
| return 0; |
| |
| if (start) |
| pos = start; |
| |
| if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) |
| return 0; |
| |
| /* |
| * If we have no capabilities, this is indicated by cap ID, |
| * cap version and next pointer all being 0. |
| */ |
| if (header == 0) |
| return 0; |
| |
| while (ttl-- > 0) { |
| if (PCI_EXT_CAP_ID(header) == cap && pos != start) |
| return pos; |
| |
| pos = PCI_EXT_CAP_NEXT(header); |
| if (pos < PCI_CFG_SPACE_SIZE) |
| break; |
| |
| if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) |
| break; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pci_find_next_ext_capability); |
| |
| /** |
| * pci_find_ext_capability - Find an extended capability |
| * @dev: PCI device to query |
| * @cap: capability code |
| * |
| * Returns the address of the requested extended capability structure |
| * within the device's PCI configuration space or 0 if the device does |
| * not support it. Possible values for @cap: |
| * |
| * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting |
| * %PCI_EXT_CAP_ID_VC Virtual Channel |
| * %PCI_EXT_CAP_ID_DSN Device Serial Number |
| * %PCI_EXT_CAP_ID_PWR Power Budgeting |
| */ |
| int pci_find_ext_capability(struct pci_dev *dev, int cap) |
| { |
| return pci_find_next_ext_capability(dev, 0, cap); |
| } |
| EXPORT_SYMBOL_GPL(pci_find_ext_capability); |
| |
| static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap) |
| { |
| int rc, ttl = PCI_FIND_CAP_TTL; |
| u8 cap, mask; |
| |
| if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST) |
| mask = HT_3BIT_CAP_MASK; |
| else |
| mask = HT_5BIT_CAP_MASK; |
| |
| pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos, |
| PCI_CAP_ID_HT, &ttl); |
| while (pos) { |
| rc = pci_read_config_byte(dev, pos + 3, &cap); |
| if (rc != PCIBIOS_SUCCESSFUL) |
| return 0; |
| |
| if ((cap & mask) == ht_cap) |
| return pos; |
| |
| pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, |
| pos + PCI_CAP_LIST_NEXT, |
| PCI_CAP_ID_HT, &ttl); |
| } |
| |
| return 0; |
| } |
| /** |
| * pci_find_next_ht_capability - query a device's Hypertransport capabilities |
| * @dev: PCI device to query |
| * @pos: Position from which to continue searching |
| * @ht_cap: Hypertransport capability code |
| * |
| * To be used in conjunction with pci_find_ht_capability() to search for |
| * all capabilities matching @ht_cap. @pos should always be a value returned |
| * from pci_find_ht_capability(). |
| * |
| * NB. To be 100% safe against broken PCI devices, the caller should take |
| * steps to avoid an infinite loop. |
| */ |
| int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap) |
| { |
| return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap); |
| } |
| EXPORT_SYMBOL_GPL(pci_find_next_ht_capability); |
| |
| /** |
| * pci_find_ht_capability - query a device's Hypertransport capabilities |
| * @dev: PCI device to query |
| * @ht_cap: Hypertransport capability code |
| * |
| * Tell if a device supports a given Hypertransport capability. |
| * Returns an address within the device's PCI configuration space |
| * or 0 in case the device does not support the request capability. |
| * The address points to the PCI capability, of type PCI_CAP_ID_HT, |
| * which has a Hypertransport capability matching @ht_cap. |
| */ |
| int pci_find_ht_capability(struct pci_dev *dev, int ht_cap) |
| { |
| int pos; |
| |
| pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); |
| if (pos) |
| pos = __pci_find_next_ht_cap(dev, pos, ht_cap); |
| |
| return pos; |
| } |
| EXPORT_SYMBOL_GPL(pci_find_ht_capability); |
| |
| /** |
| * pci_find_parent_resource - return resource region of parent bus of given region |
| * @dev: PCI device structure contains resources to be searched |
| * @res: child resource record for which parent is sought |
| * |
| * For given resource region of given device, return the resource |
| * region of parent bus the given region is contained in. |
| */ |
| struct resource *pci_find_parent_resource(const struct pci_dev *dev, |
| struct resource *res) |
| { |
| const struct pci_bus *bus = dev->bus; |
| struct resource *r; |
| int i; |
| |
| pci_bus_for_each_resource(bus, r, i) { |
| if (!r) |
| continue; |
| if (res->start && resource_contains(r, res)) { |
| |
| /* |
| * If the window is prefetchable but the BAR is |
| * not, the allocator made a mistake. |
| */ |
| if (r->flags & IORESOURCE_PREFETCH && |
| !(res->flags & IORESOURCE_PREFETCH)) |
| return NULL; |
| |
| /* |
| * If we're below a transparent bridge, there may |
| * be both a positively-decoded aperture and a |
| * subtractively-decoded region that contain the BAR. |
| * We want the positively-decoded one, so this depends |
| * on pci_bus_for_each_resource() giving us those |
| * first. |
| */ |
| return r; |
| } |
| } |
| return NULL; |
| } |
| EXPORT_SYMBOL(pci_find_parent_resource); |
| |
| /** |
| * pci_find_pcie_root_port - return PCIe Root Port |
| * @dev: PCI device to query |
| * |
| * Traverse up the parent chain and return the PCIe Root Port PCI Device |
| * for a given PCI Device. |
| */ |
| struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) |
| { |
| struct pci_dev *bridge, *highest_pcie_bridge = NULL; |
| |
| bridge = pci_upstream_bridge(dev); |
| while (bridge && pci_is_pcie(bridge)) { |
| highest_pcie_bridge = bridge; |
| bridge = pci_upstream_bridge(bridge); |
| } |
| |
| if (pci_pcie_type(highest_pcie_bridge) != PCI_EXP_TYPE_ROOT_PORT) |
| return NULL; |
| |
| return highest_pcie_bridge; |
| } |
| EXPORT_SYMBOL(pci_find_pcie_root_port); |
| |
| /** |
| * pci_wait_for_pending - wait for @mask bit(s) to clear in status word @pos |
| * @dev: the PCI device to operate on |
| * @pos: config space offset of status word |
| * @mask: mask of bit(s) to care about in status word |
| * |
| * Return 1 when mask bit(s) in status word clear, 0 otherwise. |
| */ |
| int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask) |
| { |
| int i; |
| |
| /* Wait for Transaction Pending bit clean */ |
| for (i = 0; i < 4; i++) { |
| u16 status; |
| if (i) |
| msleep((1 << (i - 1)) * 100); |
| |
| pci_read_config_word(dev, pos, &status); |
| if (!(status & mask)) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * pci_restore_bars - restore a device's BAR values (e.g. after wake-up) |
| * @dev: PCI device to have its BARs restored |
| * |
| * Restore the BAR values for a given device, so as to make it |
| * accessible by its driver. |
| */ |
| static void pci_restore_bars(struct pci_dev *dev) |
| { |
| int i; |
| |
| /* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */ |
| if (dev->is_virtfn) |
| return; |
| |
| for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) |
| pci_update_resource(dev, i); |
| } |
| |
| static struct pci_platform_pm_ops *pci_platform_pm; |
| |
| int pci_set_platform_pm(struct pci_platform_pm_ops *ops) |
| { |
| if (!ops->is_manageable || !ops->set_state || !ops->choose_state |
| || !ops->sleep_wake) |
| return -EINVAL; |
| pci_platform_pm = ops; |
| return 0; |
| } |
| |
| static inline bool platform_pci_power_manageable(struct pci_dev *dev) |
| { |
| return pci_platform_pm ? pci_platform_pm->is_manageable(dev) : false; |
| } |
| |
| static inline int platform_pci_set_power_state(struct pci_dev *dev, |
| pci_power_t t) |
| { |
| return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS; |
| } |
| |
| static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev) |
| { |
| return pci_platform_pm ? |
| pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR; |
| } |
| |
| static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable) |
| { |
| return pci_platform_pm ? |
| pci_platform_pm->sleep_wake(dev, enable) : -ENODEV; |
| } |
| |
| static inline int platform_pci_run_wake(struct pci_dev *dev, bool enable) |
| { |
| return pci_platform_pm ? |
| pci_platform_pm->run_wake(dev, enable) : -ENODEV; |
| } |
| |
| static inline bool platform_pci_need_resume(struct pci_dev *dev) |
| { |
| return pci_platform_pm ? pci_platform_pm->need_resume(dev) : false; |
| } |
| |
| /** |
| * pci_raw_set_power_state - Use PCI PM registers to set the power state of |
| * given PCI device |
| * @dev: PCI device to handle. |
| * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. |
| * |
| * RETURN VALUE: |
| * -EINVAL if the requested state is invalid. |
| * -EIO if device does not support PCI PM or its PM capabilities register has a |
| * wrong version, or device doesn't support the requested state. |
| * 0 if device already is in the requested state. |
| * 0 if device's power state has been successfully changed. |
| */ |
| static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state) |
| { |
| u16 pmcsr; |
| bool need_restore = false; |
| |
| /* Check if we're already there */ |
| if (dev->current_state == state) |
| return 0; |
| |
| if (!dev->pm_cap) |
| return -EIO; |
| |
| if (state < PCI_D0 || state > PCI_D3hot) |
| return -EINVAL; |
| |
| /* Validate current state: |
| * Can enter D0 from any state, but if we can only go deeper |
| * to sleep if we're already in a low power state |
| */ |
| if (state != PCI_D0 && dev->current_state <= PCI_D3cold |
| && dev->current_state > state) { |
| dev_err(&dev->dev, "invalid power transition (from state %d to %d)\n", |
| dev->current_state, state); |
| return -EINVAL; |
| } |
| |
| /* check if this device supports the desired state */ |
| if ((state == PCI_D1 && !dev->d1_support) |
| || (state == PCI_D2 && !dev->d2_support)) |
| return -EIO; |
| |
| pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
| |
| /* If we're (effectively) in D3, force entire word to 0. |
| * This doesn't affect PME_Status, disables PME_En, and |
| * sets PowerState to 0. |
| */ |
| switch (dev->current_state) { |
| case PCI_D0: |
| case PCI_D1: |
| case PCI_D2: |
| pmcsr &= ~PCI_PM_CTRL_STATE_MASK; |
| pmcsr |= state; |
| break; |
| case PCI_D3hot: |
| case PCI_D3cold: |
| case PCI_UNKNOWN: /* Boot-up */ |
| if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot |
| && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) |
| need_restore = true; |
| /* Fall-through: force to D0 */ |
| default: |
| pmcsr = 0; |
| break; |
| } |
| |
| /* enter specified state */ |
| pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); |
| |
| /* Mandatory power management transition delays */ |
| /* see PCI PM 1.1 5.6.1 table 18 */ |
| if (state == PCI_D3hot || dev->current_state == PCI_D3hot) |
| pci_dev_d3_sleep(dev); |
| else if (state == PCI_D2 || dev->current_state == PCI_D2) |
| udelay(PCI_PM_D2_DELAY); |
| |
| pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
| dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); |
| if (dev->current_state != state && printk_ratelimit()) |
| dev_info(&dev->dev, "Refused to change power state, currently in D%d\n", |
| dev->current_state); |
| |
| /* |
| * According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT |
| * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning |
| * from D3hot to D0 _may_ perform an internal reset, thereby |
| * going to "D0 Uninitialized" rather than "D0 Initialized". |
| * For example, at least some versions of the 3c905B and the |
| * 3c556B exhibit this behaviour. |
| * |
| * At least some laptop BIOSen (e.g. the Thinkpad T21) leave |
| * devices in a D3hot state at boot. Consequently, we need to |
| * restore at least the BARs so that the device will be |
| * accessible to its driver. |
| */ |
| if (need_restore) |
| pci_restore_bars(dev); |
| |
| if (dev->bus->self) |
| pcie_aspm_pm_state_change(dev->bus->self); |
| |
| return 0; |
| } |
| |
| /** |
| * pci_update_current_state - Read PCI power state of given device from its |
| * PCI PM registers and cache it |
| * @dev: PCI device to handle. |
| * @state: State to cache in case the device doesn't have the PM capability |
| */ |
| void pci_update_current_state(struct pci_dev *dev, pci_power_t state) |
| { |
| if (dev->pm_cap) { |
| u16 pmcsr; |
| |
| /* |
| * Configuration space is not accessible for device in |
| * D3cold, so just keep or set D3cold for safety |
| */ |
| if (dev->current_state == PCI_D3cold) |
| return; |
| if (state == PCI_D3cold) { |
| dev->current_state = PCI_D3cold; |
| return; |
| } |
| pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
| dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); |
| } else { |
| dev->current_state = state; |
| } |
| } |
| |
| /** |
| * pci_power_up - Put the given device into D0 forcibly |
| * @dev: PCI device to power up |
| */ |
| void pci_power_up(struct pci_dev *dev) |
| { |
| if (platform_pci_power_manageable(dev)) |
| platform_pci_set_power_state(dev, PCI_D0); |
| |
| pci_raw_set_power_state(dev, PCI_D0); |
| pci_update_current_state(dev, PCI_D0); |
| } |
| |
| /** |
| * pci_platform_power_transition - Use platform to change device power state |
| * @dev: PCI device to handle. |
| * @state: State to put the device into. |
| */ |
| static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state) |
| { |
| int error; |
| |
| if (platform_pci_power_manageable(dev)) { |
| error = platform_pci_set_power_state(dev, state); |
| if (!error) |
| pci_update_current_state(dev, state); |
| } else |
| error = -ENODEV; |
| |
| if (error && !dev->pm_cap) /* Fall back to PCI_D0 */ |
| dev->current_state = PCI_D0; |
| |
| return error; |
| } |
| |
| /** |
| * pci_wakeup - Wake up a PCI device |
| * @pci_dev: Device to handle. |
| * @ign: ignored parameter |
| */ |
| static int pci_wakeup(struct pci_dev *pci_dev, void *ign) |
| { |
| pci_wakeup_event(pci_dev); |
| pm_request_resume(&pci_dev->dev); |
| return 0; |
| } |
| |
| /** |
| * pci_wakeup_bus - Walk given bus and wake up devices on it |
| * @bus: Top bus of the subtree to walk. |
| */ |
| static void pci_wakeup_bus(struct pci_bus *bus) |
| { |
| if (bus) |
| pci_walk_bus(bus, pci_wakeup, NULL); |
| } |
| |
| /** |
| * __pci_start_power_transition - Start power transition of a PCI device |
| * @dev: PCI device to handle. |
| * @state: State to put the device into. |
| */ |
| static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) |
| { |
| if (state == PCI_D0) { |
| pci_platform_power_transition(dev, PCI_D0); |
| /* |
| * Mandatory power management transition delays, see |
| * PCI Express Base Specification Revision 2.0 Section |
| * 6.6.1: Conventional Reset. Do not delay for |
| * devices powered on/off by corresponding bridge, |
| * because have already delayed for the bridge. |
| */ |
| if (dev->runtime_d3cold) { |
| msleep(dev->d3cold_delay); |
| /* |
| * When powering on a bridge from D3cold, the |
| * whole hierarchy may be powered on into |
| * D0uninitialized state, resume them to give |
| * them a chance to suspend again |
| */ |
| pci_wakeup_bus(dev->subordinate); |
| } |
| } |
| } |
| |
| /** |
| * __pci_dev_set_current_state - Set current state of a PCI device |
| * @dev: Device to handle |
| * @data: pointer to state to be set |
| */ |
| static int __pci_dev_set_current_state(struct pci_dev *dev, void *data) |
| { |
| pci_power_t state = *(pci_power_t *)data; |
| |
| dev->current_state = state; |
| return 0; |
| } |
| |
| /** |
| * __pci_bus_set_current_state - Walk given bus and set current state of devices |
| * @bus: Top bus of the subtree to walk. |
| * @state: state to be set |
| */ |
| static void __pci_bus_set_current_state(struct pci_bus *bus, pci_power_t state) |
| { |
| if (bus) |
| pci_walk_bus(bus, __pci_dev_set_current_state, &state); |
| } |
| |
| /** |
| * __pci_complete_power_transition - Complete power transition of a PCI device |
| * @dev: PCI device to handle. |
| * @state: State to put the device into. |
| * |
| * This function should not be called directly by device drivers. |
| */ |
| int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state) |
| { |
| int ret; |
| |
| if (state <= PCI_D0) |
| return -EINVAL; |
| ret = pci_platform_power_transition(dev, state); |
| /* Power off the bridge may power off the whole hierarchy */ |
| if (!ret && state == PCI_D3cold) |
| __pci_bus_set_current_state(dev->subordinate, PCI_D3cold); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(__pci_complete_power_transition); |
| |
| /** |
| * pci_set_power_state - Set the power state of a PCI device |
| * @dev: PCI device to handle. |
| * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. |
| * |
| * Transition a device to a new power state, using the platform firmware and/or |
| * the device's PCI PM registers. |
| * |
| * RETURN VALUE: |
| * -EINVAL if the requested state is invalid. |
| * -EIO if device does not support PCI PM or its PM capabilities register has a |
| * wrong version, or device doesn't support the requested state. |
| * 0 if device already is in the requested state. |
| * 0 if device's power state has been successfully changed. |
| */ |
| int pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
| { |
| int error; |
| |
| /* bound the state we're entering */ |
| if (state > PCI_D3cold) |
| state = PCI_D3cold; |
| else if (state < PCI_D0) |
| state = PCI_D0; |
| else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev)) |
| /* |
| * If the device or the parent bridge do not support PCI PM, |
| * ignore the request if we're doing anything other than putting |
| * it into D0 (which would only happen on boot). |
| */ |
| return 0; |
| |
| /* Check if we're already there */ |
| if (dev->current_state == state) |
| return 0; |
| |
| __pci_start_power_transition(dev, state); |
| |
| /* This device is quirked not to be put into D3, so |
| don't put it in D3 */ |
| if (state >= PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) |
| return 0; |
| |
| /* |
| * To put device in D3cold, we put device into D3hot in native |
| * way, then put device into D3cold with platform ops |
| */ |
| error = pci_raw_set_power_state(dev, state > PCI_D3hot ? |
| PCI_D3hot : state); |
| |
| if (!__pci_complete_power_transition(dev, state)) |
| error = 0; |
| |
| return error; |
| } |
| EXPORT_SYMBOL(pci_set_power_state); |
| |
| /** |
| * pci_choose_state - Choose the power state of a PCI device |
| * @dev: PCI device to be suspended |
| * @state: target sleep state for the whole system. This is the value |
| * that is passed to suspend() function. |
| * |
| * Returns PCI power state suitable for given device and given system |
| * message. |
| */ |
| |
| pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state) |
| { |
| pci_power_t ret; |
| |
| if (!dev->pm_cap) |
| return PCI_D0; |
| |
| ret = platform_pci_choose_state(dev); |
| if (ret != PCI_POWER_ERROR) |
| return ret; |
| |
| switch (state.event) { |
| case PM_EVENT_ON: |
| return PCI_D0; |
| case PM_EVENT_FREEZE: |
| case PM_EVENT_PRETHAW: |
| /* REVISIT both freeze and pre-thaw "should" use D0 */ |
| case PM_EVENT_SUSPEND: |
| case PM_EVENT_HIBERNATE: |
| return PCI_D3hot; |
| default: |
| dev_info(&dev->dev, "unrecognized suspend event %d\n", |
| state.event); |
| BUG(); |
| } |
| return PCI_D0; |
| } |
| EXPORT_SYMBOL(pci_choose_state); |
| |
| #define PCI_EXP_SAVE_REGS 7 |
| |
| static struct pci_cap_saved_state *_pci_find_saved_cap(struct pci_dev *pci_dev, |
| u16 cap, bool extended) |
| { |
| struct pci_cap_saved_state *tmp; |
| |
| hlist_for_each_entry(tmp, &pci_dev->saved_cap_space, next) { |
| if (tmp->cap.cap_extended == extended && tmp->cap.cap_nr == cap) |
| return tmp; |
| } |
| return NULL; |
| } |
| |
| struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap) |
| { |
| return _pci_find_saved_cap(dev, cap, false); |
| } |
| |
| struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev, u16 cap) |
| { |
| return _pci_find_saved_cap(dev, cap, true); |
| } |
| |
| static int pci_save_pcie_state(struct pci_dev *dev) |
| { |
| int i = 0; |
| struct pci_cap_saved_state *save_state; |
| u16 *cap; |
| |
| if (!pci_is_pcie(dev)) |
| return 0; |
| |
| save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); |
| if (!save_state) { |
| dev_err(&dev->dev, "buffer not found in %s\n", __func__); |
| return -ENOMEM; |
| } |
| |
| cap = (u16 *)&save_state->cap.data[0]; |
| pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &cap[i++]); |
| pcie_capability_read_word(dev, PCI_EXP_LNKCTL, &cap[i++]); |
| pcie_capability_read_word(dev, PCI_EXP_SLTCTL, &cap[i++]); |
| pcie_capability_read_word(dev, PCI_EXP_RTCTL, &cap[i++]); |
| pcie_capability_read_word(dev, PCI_EXP_DEVCTL2, &cap[i++]); |
| pcie_capability_read_word(dev, PCI_EXP_LNKCTL2, &cap[i++]); |
| pcie_capability_read_word(dev, PCI_EXP_SLTCTL2, &cap[i++]); |
| |
| return 0; |
| } |
| |
| static void pci_restore_pcie_state(struct pci_dev *dev) |
| { |
| int i = 0; |
| struct pci_cap_saved_state *save_state; |
| u16 *cap; |
| |
| save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); |
| if (!save_state) |
| return; |
| |
| cap = (u16 *)&save_state->cap.data[0]; |
| pcie_capability_write_word(dev, PCI_EXP_DEVCTL, cap[i++]); |
| pcie_capability_write_word(dev, PCI_EXP_LNKCTL, cap[i++]); |
| pcie_capability_write_word(dev, PCI_EXP_SLTCTL, cap[i++]); |
| pcie_capability_write_word(dev, PCI_EXP_RTCTL, cap[i++]); |
| pcie_capability_write_word(dev, PCI_EXP_DEVCTL2, cap[i++]); |
| pcie_capability_write_word(dev, PCI_EXP_LNKCTL2, cap[i++]); |
| pcie_capability_write_word(dev, PCI_EXP_SLTCTL2, cap[i++]); |
| } |
| |
| |
| static int pci_save_pcix_state(struct pci_dev *dev) |
| { |
| int pos; |
| struct pci_cap_saved_state *save_state; |
| |
| pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| if (!pos) |
| return 0; |
| |
| save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); |
| if (!save_state) { |
| dev_err(&dev->dev, "buffer not found in %s\n", __func__); |
| return -ENOMEM; |
| } |
| |
| pci_read_config_word(dev, pos + PCI_X_CMD, |
| (u16 *)save_state->cap.data); |
| |
| return 0; |
| } |
| |
| static void pci_restore_pcix_state(struct pci_dev *dev) |
| { |
| int i = 0, pos; |
| struct pci_cap_saved_state *save_state; |
| u16 *cap; |
| |
| save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); |
| pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| if (!save_state || !pos) |
| return; |
| cap = (u16 *)&save_state->cap.data[0]; |
| |
| pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]); |
| } |
| |
| |
| /** |
| * pci_save_state - save the PCI configuration space of a device before suspending |
| * @dev: - PCI device that we're dealing with |
| */ |
| int pci_save_state(struct pci_dev *dev) |
| { |
| int i; |
| /* XXX: 100% dword access ok here? */ |
| for (i = 0; i < 16; i++) |
| pci_read_config_dword(dev, i * 4, &dev->saved_config_space[i]); |
| dev->state_saved = true; |
| |
| i = pci_save_pcie_state(dev); |
| if (i != 0) |
| return i; |
| |
| i = pci_save_pcix_state(dev); |
| if (i != 0) |
| return i; |
| |
| return pci_save_vc_state(dev); |
| } |
| EXPORT_SYMBOL(pci_save_state); |
| |
| static void pci_restore_config_dword(struct pci_dev *pdev, int offset, |
| u32 saved_val, int retry) |
| { |
| u32 val; |
| |
| pci_read_config_dword(pdev, offset, &val); |
| if (val == saved_val) |
| return; |
| |
| for (;;) { |
| dev_dbg(&pdev->dev, "restoring config space at offset %#x (was %#x, writing %#x)\n", |
| offset, val, saved_val); |
| pci_write_config_dword(pdev, offset, saved_val); |
| if (retry-- <= 0) |
| return; |
| |
| pci_read_config_dword(pdev, offset, &val); |
| if (val == saved_val) |
| return; |
| |
| mdelay(1); |
| } |
| } |
| |
| static void pci_restore_config_space_range(struct pci_dev *pdev, |
| int start, int end, int retry) |
| { |
| int index; |
| |
| for (index = end; index >= start; index--) |
| pci_restore_config_dword(pdev, 4 * index, |
| pdev->saved_config_space[index], |
| retry); |
| } |
| |
| static void pci_restore_config_space(struct pci_dev *pdev) |
| { |
| if (pdev->hdr_type == PCI_HEADER_TYPE_NORMAL) { |
| pci_restore_config_space_range(pdev, 10, 15, 0); |
| /* Restore BARs before the command register. */ |
| pci_restore_config_space_range(pdev, 4, 9, 10); |
| pci_restore_config_space_range(pdev, 0, 3, 0); |
| } else { |
| pci_restore_config_space_range(pdev, 0, 15, 0); |
| } |
| } |
| |
| /** |
| * pci_restore_state - Restore the saved state of a PCI device |
| * @dev: - PCI device that we're dealing with |
| */ |
| void pci_restore_state(struct pci_dev *dev) |
| { |
| if (!dev->state_saved) |
| return; |
| |
| /* PCI Express register must be restored first */ |
| pci_restore_pcie_state(dev); |
| pci_restore_ats_state(dev); |
| pci_restore_vc_state(dev); |
| |
| pci_cleanup_aer_error_status_regs(dev); |
| |
| pci_restore_config_space(dev); |
| |
| pci_restore_pcix_state(dev); |
| pci_restore_msi_state(dev); |
| |
| /* Restore ACS and IOV configuration state */ |
| pci_enable_acs(dev); |
| pci_restore_iov_state(dev); |
| |
| dev->state_saved = false; |
| } |
| EXPORT_SYMBOL(pci_restore_state); |
| |
| struct pci_saved_state { |
| u32 config_space[16]; |
| struct pci_cap_saved_data cap[0]; |
| }; |
| |
| /** |
| * pci_store_saved_state - Allocate and return an opaque struct containing |
| * the device saved state. |
| * @dev: PCI device that we're dealing with |
| * |
| * Return NULL if no state or error. |
| */ |
| struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev) |
| { |
| struct pci_saved_state *state; |
| struct pci_cap_saved_state *tmp; |
| struct pci_cap_saved_data *cap; |
| size_t size; |
| |
| if (!dev->state_saved) |
| return NULL; |
| |
| size = sizeof(*state) + sizeof(struct pci_cap_saved_data); |
| |
| hlist_for_each_entry(tmp, &dev->saved_cap_space, next) |
| size += sizeof(struct pci_cap_saved_data) + tmp->cap.size; |
| |
| state = kzalloc(size, GFP_KERNEL); |
| if (!state) |
| return NULL; |
| |
| memcpy(state->config_space, dev->saved_config_space, |
| sizeof(state->config_space)); |
| |
| cap = state->cap; |
| hlist_for_each_entry(tmp, &dev->saved_cap_space, next) { |
| size_t len = sizeof(struct pci_cap_saved_data) + tmp->cap.size; |
| memcpy(cap, &tmp->cap, len); |
| cap = (struct pci_cap_saved_data *)((u8 *)cap + len); |
| } |
| /* Empty cap_save terminates list */ |
| |
| return state; |
| } |
| EXPORT_SYMBOL_GPL(pci_store_saved_state); |
| |
| /** |
| * pci_load_saved_state - Reload the provided save state into struct pci_dev. |
| * @dev: PCI device that we're dealing with |
| * @state: Saved state returned from pci_store_saved_state() |
| */ |
| int pci_load_saved_state(struct pci_dev *dev, |
| struct pci_saved_state *state) |
| { |
| struct pci_cap_saved_data *cap; |
| |
| dev->state_saved = false; |
| |
| if (!state) |
| return 0; |
| |
| memcpy(dev->saved_config_space, state->config_space, |
| sizeof(state->config_space)); |
| |
| cap = state->cap; |
| while (cap->size) { |
| struct pci_cap_saved_state *tmp; |
| |
| tmp = _pci_find_saved_cap(dev, cap->cap_nr, cap->cap_extended); |
| if (!tmp || tmp->cap.size != cap->size) |
| return -EINVAL; |
| |
| memcpy(tmp->cap.data, cap->data, tmp->cap.size); |
| cap = (struct pci_cap_saved_data *)((u8 *)cap + |
| sizeof(struct pci_cap_saved_data) + cap->size); |
| } |
| |
| dev->state_saved = true; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pci_load_saved_state); |
| |
| /** |
| * pci_load_and_free_saved_state - Reload the save state pointed to by state, |
| * and free the memory allocated for it. |
| * @dev: PCI device that we're dealing with |
| * @state: Pointer to saved state returned from pci_store_saved_state() |
| */ |
| int pci_load_and_free_saved_state(struct pci_dev *dev, |
| struct pci_saved_state **state) |
| { |
| int ret = pci_load_saved_state(dev, *state); |
| kfree(*state); |
| *state = NULL; |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state); |
| |
| int __weak pcibios_enable_device(struct pci_dev *dev, int bars) |
| { |
| return pci_enable_resources(dev, bars); |
| } |
| |
| static int do_pci_enable_device(struct pci_dev *dev, int bars) |
| { |
| int err; |
| struct pci_dev *bridge; |
| u16 cmd; |
| u8 pin; |
| |
| err = pci_set_power_state(dev, PCI_D0); |
| if (err < 0 && err != -EIO) |
| return err; |
| |
| bridge = pci_upstream_bridge(dev); |
| if (bridge) |
| pcie_aspm_powersave_config_link(bridge); |
| |
| err = pcibios_enable_device(dev, bars); |
| if (err < 0) |
| return err; |
| pci_fixup_device(pci_fixup_enable, dev); |
| |
| if (dev->msi_enabled || dev->msix_enabled) |
| return 0; |
| |
| pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); |
| if (pin) { |
| pci_read_config_word(dev, PCI_COMMAND, &cmd); |
| if (cmd & PCI_COMMAND_INTX_DISABLE) |
| pci_write_config_word(dev, PCI_COMMAND, |
| cmd & ~PCI_COMMAND_INTX_DISABLE); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * pci_reenable_device - Resume abandoned device |
| * @dev: PCI device to be resumed |
| * |
| * Note this function is a backend of pci_default_resume and is not supposed |
| * to be called by normal code, write proper resume handler and use it instead. |
| */ |
| int pci_reenable_device(struct pci_dev *dev) |
| { |
| if (pci_is_enabled(dev)) |
| return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1); |
| return 0; |
| } |
| EXPORT_SYMBOL(pci_reenable_device); |
| |
| static void pci_enable_bridge(struct pci_dev *dev) |
| { |
| struct pci_dev *bridge; |
| int retval; |
| |
| bridge = pci_upstream_bridge(dev); |
| if (bridge) |
| pci_enable_bridge(bridge); |
| |
| if (pci_is_enabled(dev)) { |
| if (!dev->is_busmaster) |
| pci_set_master(dev); |
| return; |
| } |
| |
| retval = pci_enable_device(dev); |
| if (retval) |
| dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", |
| retval); |
| pci_set_master(dev); |
| } |
| |
| static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags) |
| { |
| struct pci_dev *bridge; |
| int err; |
| int i, bars = 0; |
| |
| /* |
| * Power state could be unknown at this point, either due to a fresh |
| * boot or a device removal call. So get the current power state |
| * so that things like MSI message writing will behave as expected |
| * (e.g. if the device really is in D0 at enable time). |
| */ |
| if (dev->pm_cap) { |
| u16 pmcsr; |
| pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
| dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); |
| } |
| |
| if (atomic_inc_return(&dev->enable_cnt) > 1) |
| return 0; /* already enabled */ |
| |
| bridge = pci_upstream_bridge(dev); |
| if (bridge) |
| pci_enable_bridge(bridge); |
| |
| /* only skip sriov related */ |
| for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
| if (dev->resource[i].flags & flags) |
| bars |= (1 << i); |
| for (i = PCI_BRIDGE_RESOURCES; i < DEVICE_COUNT_RESOURCE; i++) |
| if (dev->resource[i].flags & flags) |
| bars |= (1 << i); |
| |
| err = do_pci_enable_device(dev, bars); |
| if (err < 0) |
| atomic_dec(&dev->enable_cnt); |
| return err; |
| } |
| |
| /** |
| * pci_enable_device_io - Initialize a device for use with IO space |
| * @dev: PCI device to be initialized |
| * |
| * Initialize device before it's used by a driver. Ask low-level code |
| * to enable I/O resources. Wake up the device if it was suspended. |
| * Beware, this function can fail. |
| */ |
| int pci_enable_device_io(struct pci_dev *dev) |
| { |
| return pci_enable_device_flags(dev, IORESOURCE_IO); |
| } |
| EXPORT_SYMBOL(pci_enable_device_io); |
| |
| /** |
| * pci_enable_device_mem - Initialize a device for use with Memory space |
| * @dev: PCI device to be initialized |
| * |
| * Initialize device before it's used by a driver. Ask low-level code |
| * to enable Memory resources. Wake up the device if it was suspended. |
| * Beware, this function can fail. |
| */ |
| int pci_enable_device_mem(struct pci_dev *dev) |
| { |
| return pci_enable_device_flags(dev, IORESOURCE_MEM); |
| } |
| EXPORT_SYMBOL(pci_enable_device_mem); |
| |
| /** |
| * pci_enable_device - Initialize device before it's used by a driver. |
| * @dev: PCI device to be initialized |
| * |
| * Initialize device before it's used by a driver. Ask low-level code |
| * to enable I/O and memory. Wake up the device if it was suspended. |
| * Beware, this function can fail. |
| * |
| * Note we don't actually enable the device many times if we call |
| * this function repeatedly (we just increment the count). |
| */ |
| int pci_enable_device(struct pci_dev *dev) |
| { |
| return pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO); |
| } |
| EXPORT_SYMBOL(pci_enable_device); |
| |
| /* |
| * Managed PCI resources. This manages device on/off, intx/msi/msix |
| * on/off and BAR regions. pci_dev itself records msi/msix status, so |
| * there's no need to track it separately. pci_devres is initialized |
| * when a device is enabled using managed PCI device enable interface. |
| */ |
| struct pci_devres { |
| unsigned int enabled:1; |
| unsigned int pinned:1; |
| unsigned int orig_intx:1; |
| unsigned int restore_intx:1; |
| u32 region_mask; |
| }; |
| |
| static void pcim_release(struct device *gendev, void *res) |
| { |
| struct pci_dev *dev = container_of(gendev, struct pci_dev, dev); |
| struct pci_devres *this = res; |
| int i; |
| |
| if (dev->msi_enabled) |
| pci_disable_msi(dev); |
| if (dev->msix_enabled) |
| pci_disable_msix(dev); |
| |
| for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) |
| if (this->region_mask & (1 << i)) |
| pci_release_region(dev, i); |
| |
| if (this->restore_intx) |
| pci_intx(dev, this->orig_intx); |
| |
| if (this->enabled && !this->pinned) |
| pci_disable_device(dev); |
| } |
| |
| static struct pci_devres *get_pci_dr(struct pci_dev *pdev) |
| { |
| struct pci_devres *dr, *new_dr; |
| |
| dr = devres_find(&pdev->dev, pcim_release, NULL, NULL); |
| if (dr) |
| return dr; |
| |
| new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL); |
| if (!new_dr) |
| return NULL; |
| return devres_get(&pdev->dev, new_dr, NULL, NULL); |
| } |
| |
| static struct pci_devres *find_pci_dr(struct pci_dev *pdev) |
| { |
| if (pci_is_managed(pdev)) |
| return devres_find(&pdev->dev, pcim_release, NULL, NULL); |
| return NULL; |
| } |
| |
| /** |
| * pcim_enable_device - Managed pci_enable_device() |
| * @pdev: PCI device to be initialized |
| * |
| * Managed pci_enable_device(). |
| */ |
| int pcim_enable_device(struct pci_dev *pdev) |
| { |
| struct pci_devres *dr; |
| int rc; |
| |
| dr = get_pci_dr(pdev); |
| if (unlikely(!dr)) |
| return -ENOMEM; |
| if (dr->enabled) |
| return 0; |
| |
| rc = pci_enable_device(pdev); |
| if (!rc) { |
| pdev->is_managed = 1; |
| dr->enabled = 1; |
| } |
| return rc; |
| } |
| EXPORT_SYMBOL(pcim_enable_device); |
| |
| /** |
| * pcim_pin_device - Pin managed PCI device |
| * @pdev: PCI device to pin |
| * |
| * Pin managed PCI device @pdev. Pinned device won't be disabled on |
| * driver detach. @pdev must have been enabled with |
| * pcim_enable_device(). |
| */ |
| void pcim_pin_device(struct pci_dev *pdev) |
| { |
| struct pci_devres *dr; |
| |
| dr = find_pci_dr(pdev); |
| WARN_ON(!dr || !dr->enabled); |
| if (dr) |
| dr->pinned = 1; |
| } |
| EXPORT_SYMBOL(pcim_pin_device); |
| |
| /* |
| * pcibios_add_device - provide arch specific hooks when adding device dev |
| * @dev: the PCI device being added |
| * |
| * Permits the platform to provide architecture specific functionality when |
| * devices are added. This is the default implementation. Architecture |
| * implementations can override this. |
| */ |
| int __weak pcibios_add_device(struct pci_dev *dev) |
| { |
| return 0; |
| } |
| |
| /** |
| * pcibios_release_device - provide arch specific hooks when releasing device dev |
| * @dev: the PCI device being released |
| * |
| * Permits the platform to provide architecture specific functionality when |
| * devices are released. This is the default implementation. Architecture |
| * implementations can override this. |
| */ |
| void __weak pcibios_release_device(struct pci_dev *dev) {} |
| |
| /** |
| * pcibios_disable_device - disable arch specific PCI resources for device dev |
| * @dev: the PCI device to disable |
| * |
| * Disables architecture specific PCI resources for the device. This |
| * is the default implementation. Architecture implementations can |
| * override this. |
| */ |
| void __weak pcibios_disable_device (struct pci_dev *dev) {} |
| |
| /** |
| * pcibios_penalize_isa_irq - penalize an ISA IRQ |
| * @irq: ISA IRQ to penalize |
| * @active: IRQ active or not |
| * |
| * Permits the platform to provide architecture-specific functionality when |
| * penalizing ISA IRQs. This is the default implementation. Architecture |
| * implementations can override this. |
| */ |
| void __weak pcibios_penalize_isa_irq(int irq, int active) {} |
| |
| static void do_pci_disable_device(struct pci_dev *dev) |
| { |
| u16 pci_command; |
| |
| pci_read_config_word(dev, PCI_COMMAND, &pci_command); |
| if (pci_command & PCI_COMMAND_MASTER) { |
| pci_command &= ~PCI_COMMAND_MASTER; |
| pci_write_config_word(dev, PCI_COMMAND, pci_command); |
| } |
| |
| pcibios_disable_device(dev); |
| } |
| |
| /** |
| * pci_disable_enabled_device - Disable device without updating enable_cnt |
| * @dev: PCI device to disable |
| * |
| * NOTE: This function is a backend of PCI power management routines and is |
| * not supposed to be called drivers. |
| */ |
| void pci_disable_enabled_device(struct pci_dev *dev) |
| { |
| if (pci_is_enabled(dev)) |
| do_pci_disable_device(dev); |
| } |
| |
| /** |
| * pci_disable_device - Disable PCI device after use |
| * @dev: PCI device to be disabled |
| * |
| * Signal to the system that the PCI device is not in use by the system |
| * anymore. This only involves disabling PCI bus-mastering, if active. |
| * |
| * Note we don't actually disable the device until all callers of |
| * pci_enable_device() have called pci_disable_device(). |
| */ |
| void pci_disable_device(struct pci_dev *dev) |
| { |
| struct pci_devres *dr; |
| |
| dr = find_pci_dr(dev); |
| if (dr) |
| dr->enabled = 0; |
| |
| dev_WARN_ONCE(&dev->dev, atomic_read(&dev->enable_cnt) <= 0, |
| "disabling already-disabled device"); |
| |
| if (atomic_dec_return(&dev->enable_cnt) != 0) |
| return; |
| |
| do_pci_disable_device(dev); |
| |
| dev->is_busmaster = 0; |
| } |
| EXPORT_SYMBOL(pci_disable_device); |
| |
| /** |
| * pcibios_set_pcie_reset_state - set reset state for device dev |
| * @dev: the PCIe device reset |
| * @state: Reset state to enter into |
| * |
| * |
| * Sets the PCIe reset state for the device. This is the default |
| * implementation. Architecture implementations can override this. |
| */ |
| int __weak pcibios_set_pcie_reset_state(struct pci_dev *dev, |
| enum pcie_reset_state state) |
| { |
| return -EINVAL; |
| } |
| |
| /** |
| * pci_set_pcie_reset_state - set reset state for device dev |
| * @dev: the PCIe device reset |
| * @state: Reset state to enter into |
| * |
| * |
| * Sets the PCI reset state for the device. |
| */ |
| int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state) |
| { |
| return pcibios_set_pcie_reset_state(dev, state); |
| } |
| EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state); |
| |
| /** |
| * pci_check_pme_status - Check if given device has generated PME. |
| * @dev: Device to check. |
| * |
| * Check the PME status of the device and if set, clear it and clear PME enable |
| * (if set). Return 'true' if PME status and PME enable were both set or |
| * 'false' otherwise. |
| */ |
| bool pci_check_pme_status(struct pci_dev *dev) |
| { |
| int pmcsr_pos; |
| u16 pmcsr; |
| bool ret = false; |
| |
| if (!dev->pm_cap) |
| return false; |
| |
| pmcsr_pos = dev->pm_cap + PCI_PM_CTRL; |
| pci_read_config_word(dev, pmcsr_pos, &pmcsr); |
| if (!(pmcsr & PCI_PM_CTRL_PME_STATUS)) |
| return false; |
| |
| /* Clear PME status. */ |
| pmcsr |= PCI_PM_CTRL_PME_STATUS; |
| if (pmcsr & PCI_PM_CTRL_PME_ENABLE) { |
| /* Disable PME to avoid interrupt flood. */ |
| pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; |
| ret = true; |
| } |
| |
| pci_write_config_word(dev, pmcsr_pos, pmcsr); |
| |
| return ret; |
| } |
| |
| /** |
| * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set. |
| * @dev: Device to handle. |
| * @pme_poll_reset: Whether or not to reset the device's pme_poll flag. |
| * |
| * Check if @dev has generated PME and queue a resume request for it in that |
| * case. |
| */ |
| static int pci_pme_wakeup(struct pci_dev *dev, void *pme_poll_reset) |
| { |
| if (pme_poll_reset && dev->pme_poll) |
| dev->pme_poll = false; |
| |
| if (pci_check_pme_status(dev)) { |
| pci_wakeup_event(dev); |
| pm_request_resume(&dev->dev); |
| } |
| return 0; |
| } |
| |
| /** |
| * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary. |
| * @bus: Top bus of the subtree to walk. |
| */ |
| void pci_pme_wakeup_bus(struct pci_bus *bus) |
| { |
| if (bus) |
| pci_walk_bus(bus, pci_pme_wakeup, (void *)true); |
| } |
| |
| |
| /** |
| * pci_pme_capable - check the capability of PCI device to generate PME# |
| * @dev: PCI device to handle. |
| * @state: PCI state from which device will issue PME#. |
| */ |
| bool pci_pme_capable(struct pci_dev *dev, pci_power_t state) |
| { |
| if (!dev->pm_cap) |
| return false; |
| |
| return !!(dev->pme_support & (1 << state)); |
| } |
| EXPORT_SYMBOL(pci_pme_capable); |
| |
| static void pci_pme_list_scan(struct work_struct *work) |
| { |
| struct pci_pme_device *pme_dev, *n; |
| |
| mutex_lock(&pci_pme_list_mutex); |
| list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) { |
| if (pme_dev->dev->pme_poll) { |
| struct pci_dev *bridge; |
| |
| bridge = pme_dev->dev->bus->self; |
| /* |
| * If bridge is in low power state, the |
| * configuration space of subordinate devices |
| * may be not accessible |
| */ |
| if (bridge && bridge->current_state != PCI_D0) |
| continue; |
| pci_pme_wakeup(pme_dev->dev, NULL); |
| } else { |
| list_del(&pme_dev->list); |
| kfree(pme_dev); |
| } |
| } |
| if (!list_empty(&pci_pme_list)) |
| schedule_delayed_work(&pci_pme_work, |
| msecs_to_jiffies(PME_TIMEOUT)); |
| mutex_unlock(&pci_pme_list_mutex); |
| } |
| |
| static void __pci_pme_active(struct pci_dev *dev, bool enable) |
| { |
| u16 pmcsr; |
| |
| if (!dev->pme_support) |
| return; |
| |
| pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
| /* Clear PME_Status by writing 1 to it and enable PME# */ |
| pmcsr |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE; |
| if (!enable) |
| pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; |
| |
| pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); |
| } |
| |
| /** |
| * pci_pme_active - enable or disable PCI device's PME# function |
| * @dev: PCI device to handle. |
| * @enable: 'true' to enable PME# generation; 'false' to disable it. |
| * |
| * The caller must verify that the device is capable of generating PME# before |
| * calling this function with @enable equal to 'true'. |
| */ |
| void pci_pme_active(struct pci_dev *dev, bool enable) |
| { |
| __pci_pme_active(dev, enable); |
| |
| /* |
| * PCI (as opposed to PCIe) PME requires that the device have |
| * its PME# line hooked up correctly. Not all hardware vendors |
| * do this, so the PME never gets delivered and the device |
| * remains asleep. The easiest way around this is to |
| * periodically walk the list of suspended devices and check |
| * whether any have their PME flag set. The assumption is that |
| * we'll wake up often enough anyway that this won't be a huge |
| * hit, and the power savings from the devices will still be a |
| * win. |
| * |
| * Although PCIe uses in-band PME message instead of PME# line |
| * to report PME, PME does not work for some PCIe devices in |
| * reality. For example, there are devices that set their PME |
| * status bits, but don't really bother to send a PME message; |
| * there are PCI Express Root Ports that don't bother to |
| * trigger interrupts when they receive PME messages from the |
| * devices below. So PME poll is used for PCIe devices too. |
| */ |
| |
| if (dev->pme_poll) { |
| struct pci_pme_device *pme_dev; |
| if (enable) { |
| pme_dev = kmalloc(sizeof(struct pci_pme_device), |
| GFP_KERNEL); |
| if (!pme_dev) { |
| dev_warn(&dev->dev, "can't enable PME#\n"); |
| return; |
| } |
| pme_dev->dev = dev; |
| mutex_lock(&pci_pme_list_mutex); |
| list_add(&pme_dev->list, &pci_pme_list); |
| if (list_is_singular(&pci_pme_list)) |
| schedule_delayed_work(&pci_pme_work, |
| msecs_to_jiffies(PME_TIMEOUT)); |
| mutex_unlock(&pci_pme_list_mutex); |
| } else { |
| mutex_lock(&pci_pme_list_mutex); |
| list_for_each_entry(pme_dev, &pci_pme_list, list) { |
| if (pme_dev->dev == dev) { |
| list_del(&pme_dev->list); |
| kfree(pme_dev); |
| break; |
| } |
| } |
| mutex_unlock(&pci_pme_list_mutex); |
| } |
| } |
| |
| dev_dbg(&dev->dev, "PME# %s\n", enable ? "enabled" : "disabled"); |
| } |
| EXPORT_SYMBOL(pci_pme_active); |
| |
| /** |
| * __pci_enable_wake - enable PCI device as wakeup event source |
| * @dev: PCI device affected |
| * @state: PCI state from which device will issue wakeup events |
| * @runtime: True if the events are to be generated at run time |
| * @enable: True to enable event generation; false to disable |
| * |
| * This enables the device as a wakeup event source, or disables it. |
| * When such events involves platform-specific hooks, those hooks are |
| * called automatically by this routine. |
| * |
| * Devices with legacy power management (no standard PCI PM capabilities) |
| * always require such platform hooks. |
| * |
| * RETURN VALUE: |
| * 0 is returned on success |
| * -EINVAL is returned if device is not supposed to wake up the system |
| * Error code depending on the platform is returned if both the platform and |
| * the native mechanism fail to enable the generation of wake-up events |
| */ |
| int __pci_enable_wake(struct pci_dev *dev, pci_power_t state, |
| bool runtime, bool enable) |
| { |
| int ret = 0; |
| |
| if (enable && !runtime && !device_may_wakeup(&dev->dev)) |
| return -EINVAL; |
| |
| /* Don't do the same thing twice in a row for one device. */ |
| if (!!enable == !!dev->wakeup_prepared) |
| return 0; |
| |
| /* |
| * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don |
| * Anderson we should be doing PME# wake enable followed by ACPI wake |
| * enable. To disable wake-up we call the platform first, for symmetry. |
| */ |
| |
| if (enable) { |
| int error; |
| |
| if (pci_pme_capable(dev, state)) |
| pci_pme_active(dev, true); |
| else |
| ret = 1; |
| error = runtime ? platform_pci_run_wake(dev, true) : |
| platform_pci_sleep_wake(dev, true); |
| if (ret) |
| ret = error; |
| if (!ret) |
| dev->wakeup_prepared = true; |
| } else { |
| if (runtime) |
| platform_pci_run_wake(dev, false); |
| else |
| platform_pci_sleep_wake(dev, false); |
| pci_pme_active(dev, false); |
| dev->wakeup_prepared = false; |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(__pci_enable_wake); |
| |
| /** |
| * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold |
| * @dev: PCI device to prepare |
| * @enable: True to enable wake-up event generation; false to disable |
| * |
| * Many drivers want the device to wake up the system from D3_hot or D3_cold |
| * and this function allows them to set that up cleanly - pci_enable_wake() |
| * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI |
| * ordering constraints. |
| * |
| * This function only returns error code if the device is not capable of |
| * generating PME# from both D3_hot and D3_cold, and the platform is unable to |
| * enable wake-up power for it. |
| */ |
| int pci_wake_from_d3(struct pci_dev *dev, bool enable) |
| { |
| return pci_pme_capable(dev, PCI_D3cold) ? |
| pci_enable_wake(dev, PCI_D3cold, enable) : |
| pci_enable_wake(dev, PCI_D3hot, enable); |
| } |
| EXPORT_SYMBOL(pci_wake_from_d3); |
| |
| /** |
| * pci_target_state - find an appropriate low power state for a given PCI dev |
| * @dev: PCI device |
| * |
| * Use underlying platform code to find a supported low power state for @dev. |
| * If the platform can't manage @dev, return the deepest state from which it |
| * can generate wake events, based on any available PME info. |
| */ |
| static pci_power_t pci_target_state(struct pci_dev *dev) |
| { |
| pci_power_t target_state = PCI_D3hot; |
| |
| if (platform_pci_power_manageable(dev)) { |
| /* |
| * Call the platform to choose the target state of the device |
| * and enable wake-up from this state if supported. |
| */ |
| pci_power_t state = platform_pci_choose_state(dev); |
| |
| switch (state) { |
| case PCI_POWER_ERROR: |
| case PCI_UNKNOWN: |
| break; |
| case PCI_D1: |
| case PCI_D2: |
| if (pci_no_d1d2(dev)) |
| break; |
| default: |
| target_state = state; |
| } |
| } else if (!dev->pm_cap) { |
| target_state = PCI_D0; |
| } else if (device_may_wakeup(&dev->dev)) { |
| /* |
| * Find the deepest state from which the device can generate |
| * wake-up events, make it the target state and enable device |
| * to generate PME#. |
| */ |
| if (dev->pme_support) { |
| while (target_state |
| && !(dev->pme_support & (1 << target_state))) |
| target_state--; |
| } |
| } |
| |
| return target_state; |
| } |
| |
| /** |
| * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state |
| * @dev: Device to handle. |
| * |
| * Choose the power state appropriate for the device depending on whether |
| * it can wake up the system and/or is power manageable by the platform |
| * (PCI_D3hot is the default) and put the device into that state. |
| */ |
| int pci_prepare_to_sleep(struct pci_dev *dev) |
| { |
| pci_power_t target_state = pci_target_state(dev); |
| int error; |
| |
| if (target_state == PCI_POWER_ERROR) |
| return -EIO; |
| |
| pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev)); |
| |
| error = pci_set_power_state(dev, target_state); |
| |
| if (error) |
| pci_enable_wake(dev, target_state, false); |
| |
| return error; |
| } |
| EXPORT_SYMBOL(pci_prepare_to_sleep); |
| |
| /** |
| * pci_back_from_sleep - turn PCI device on during system-wide transition into working state |
| * @dev: Device to handle. |
| * |
| * Disable device's system wake-up capability and put it into D0. |
| */ |
| int pci_back_from_sleep(struct pci_dev *dev) |
| { |
| pci_enable_wake(dev, PCI_D0, false); |
| return pci_set_power_state(dev, PCI_D0); |
| } |
| EXPORT_SYMBOL(pci_back_from_sleep); |
| |
| /** |
| * pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend. |
| * @dev: PCI device being suspended. |
| * |
| * Prepare @dev to generate wake-up events at run time and put it into a low |
| * power state. |
| */ |
| int pci_finish_runtime_suspend(struct pci_dev *dev) |
| { |
| pci_power_t target_state = pci_target_state(dev); |
| int error; |
| |
| if (target_state == PCI_POWER_ERROR) |
| return -EIO; |
| |
| dev->runtime_d3cold = target_state == PCI_D3cold; |
| |
| __pci_enable_wake(dev, target_state, true, pci_dev_run_wake(dev)); |
| |
| error = pci_set_power_state(dev, target_state); |
| |
| if (error) { |
| __pci_enable_wake(dev, target_state, true, false); |
| dev->runtime_d3cold = false; |
| } |
| |
| return error; |
| } |
| |
| /** |
| * pci_dev_run_wake - Check if device can generate run-time wake-up events. |
| * @dev: Device to check. |
| * |
| * Return true if the device itself is capable of generating wake-up events |
| * (through the platform or using the native PCIe PME) or if the device supports |
| * PME and one of its upstream bridges can generate wake-up events. |
| */ |
| bool pci_dev_run_wake(struct pci_dev *dev) |
| { |
| struct pci_bus *bus = dev->bus; |
| |
| if (device_run_wake(&dev->dev)) |
| return true; |
| |
| if (!dev->pme_support) |
| return false; |
| |
| while (bus->parent) { |
| struct pci_dev *bridge = bus->self; |
| |
| if (device_run_wake(&bridge->dev)) |
| return true; |
| |
| bus = bus->parent; |
| } |
| |
| /* We have reached the root bus. */ |
| if (bus->bridge) |
| return device_run_wake(bus->bridge); |
| |
| return false; |
| } |
| EXPORT_SYMBOL_GPL(pci_dev_run_wake); |
| |
| /** |
| * pci_dev_keep_suspended - Check if the device can stay in the suspended state. |
| * @pci_dev: Device to check. |
| * |
| * Return 'true' if the device is runtime-suspended, it doesn't have to be |
| * reconfigured due to wakeup settings difference between system and runtime |
| * suspend and the current power state of it is suitable for the upcoming |
| * (system) transition. |
| * |
| * If the device is not configured for system wakeup, disable PME for it before |
| * returning 'true' to prevent it from waking up the system unnecessarily. |
| */ |
| bool pci_dev_keep_suspended(struct pci_dev *pci_dev) |
| { |
| struct device *dev = &pci_dev->dev; |
| |
| if (!pm_runtime_suspended(dev) |
| || pci_target_state(pci_dev) != pci_dev->current_state |
| || platform_pci_need_resume(pci_dev)) |
| return false; |
| |
| /* |
| * At this point the device is good to go unless it's been configured |
| * to generate PME at the runtime suspend time, but it is not supposed |
| * to wake up the system. In that case, simply disable PME for it |
| * (it will have to be re-enabled on exit from system resume). |
| * |
| * If the device's power state is D3cold and the platform check above |
| * hasn't triggered, the device's configuration is suitable and we don't |
| * need to manipulate it at all. |
| */ |
| spin_lock_irq(&dev->power.lock); |
| |
| if (pm_runtime_suspended(dev) && pci_dev->current_state < PCI_D3cold && |
| !device_may_wakeup(dev)) |
| __pci_pme_active(pci_dev, false); |
| |
| spin_unlock_irq(&dev->power.lock); |
| return true; |
| } |
| |
| /** |
| * pci_dev_complete_resume - Finalize resume from system sleep for a device. |
| * @pci_dev: Device to handle. |
| * |
| * If the device is runtime suspended and wakeup-capable, enable PME for it as |
| * it might have been disabled during the prepare phase of system suspend if |
| * the device was not configured for system wakeup. |
| */ |
| void pci_dev_complete_resume(struct pci_dev *pci_dev) |
| { |
| struct device *dev = &pci_dev->dev; |
| |
| if (!pci_dev_run_wake(pci_dev)) |
| return; |
| |
| spin_lock_irq(&dev->power.lock); |
| |
| if (pm_runtime_suspended(dev) && pci_dev->current_state < PCI_D3cold) |
| __pci_pme_active(pci_dev, true); |
| |
| spin_unlock_irq(&dev->power.lock); |
| } |
| |
| void pci_config_pm_runtime_get(struct pci_dev *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct device *parent = dev->parent; |
| |
| if (parent) |
| pm_runtime_get_sync(parent); |
| pm_runtime_get_noresume(dev); |
| /* |
| * pdev->current_state is set to PCI_D3cold during suspending, |
| * so wait until suspending completes |
| */ |
| pm_runtime_barrier(dev); |
| /* |
| * Only need to resume devices in D3cold, because config |
| * registers are still accessible for devices suspended but |
| * not in D3cold. |
| */ |
| if (pdev->current_state == PCI_D3cold) |
| pm_runtime_resume(dev); |
| } |
| |
| void pci_config_pm_runtime_put(struct pci_dev *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct device *parent = dev->parent; |
| |
| pm_runtime_put(dev); |
| if (parent) |
| pm_runtime_put_sync(parent); |
| } |
| |
| /** |
| * pci_pm_init - Initialize PM functions of given PCI device |
| * @dev: PCI device to handle. |
| */ |
| void pci_pm_init(struct pci_dev *dev) |
| { |
| int pm; |
| u16 pmc; |
| |
| pm_runtime_forbid(&dev->dev); |
| pm_runtime_set_active(&dev->dev); |
| pm_runtime_enable(&dev->dev); |
| device_enable_async_suspend(&dev->dev); |
| dev->wakeup_prepared = false; |
| |
| dev->pm_cap = 0; |
| dev->pme_support = 0; |
| |
| /* find PCI PM capability in list */ |
| pm = pci_find_capability(dev, PCI_CAP_ID_PM); |
| if (!pm) |
| return; |
| /* Check device's ability to generate PME# */ |
| pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc); |
| |
| if ((pmc & PCI_PM_CAP_VER_MASK) > 3) { |
| dev_err(&dev->dev, "unsupported PM cap regs version (%u)\n", |
| pmc & PCI_PM_CAP_VER_MASK); |
| return; |
| } |
| |
| dev->pm_cap = pm; |
| dev->d3_delay = PCI_PM_D3_WAIT; |
| dev->d3cold_delay = PCI_PM_D3COLD_WAIT; |
| dev->d3cold_allowed = true; |
| |
| dev->d1_support = false; |
| dev->d2_support = false; |
| if (!pci_no_d1d2(dev)) { |
| if (pmc & PCI_PM_CAP_D1) |
| dev->d1_support = true; |
| if (pmc & PCI_PM_CAP_D2) |
| dev->d2_support = true; |
| |
| if (dev->d1_support || dev->d2_support) |
| dev_printk(KERN_DEBUG, &dev->dev, "supports%s%s\n", |
| dev->d1_support ? " D1" : "", |
| dev->d2_support ? " D2" : ""); |
| } |
| |
| pmc &= PCI_PM_CAP_PME_MASK; |
| if (pmc) { |
| dev_printk(KERN_DEBUG, &dev->dev, |
| "PME# supported from%s%s%s%s%s\n", |
| (pmc & PCI_PM_CAP_PME_D0) ? " D0" : "", |
| (pmc & PCI_PM_CAP_PME_D1) ? " D1" : "", |
| (pmc & PCI_PM_CAP_PME_D2) ? " D2" : "", |
| (pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "", |
| (pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : ""); |
| dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT; |
| dev->pme_poll = true; |
| /* |
| * Make device's PM flags reflect the wake-up capability, but |
| * let the user space enable it to wake up the system as needed. |
| */ |
| device_set_wakeup_capable(&dev->dev, true); |
| /* Disable the PME# generation functionality */ |
| pci_pme_active(dev, false); |
| } |
| } |
| |
| static unsigned long pci_ea_flags(struct pci_dev *dev, u8 prop) |
| { |
| unsigned long flags = IORESOURCE_PCI_FIXED; |
| |
| switch (prop) { |
| case PCI_EA_P_MEM: |
| case PCI_EA_P_VF_MEM: |
| flags |= IORESOURCE_MEM; |
| break; |
| case PCI_EA_P_MEM_PREFETCH: |
| case PCI_EA_P_VF_MEM_PREFETCH: |
| flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH; |
| break; |
| case PCI_EA_P_IO: |
| flags |= IORESOURCE_IO; |
| break; |
| default: |
| return 0; |
| } |
| |
| return flags; |
| } |
| |
| static struct resource *pci_ea_get_resource(struct pci_dev *dev, u8 bei, |
| u8 prop) |
| { |
| if (bei <= PCI_EA_BEI_BAR5 && prop <= PCI_EA_P_IO) |
| return &dev->resource[bei]; |
| #ifdef CONFIG_PCI_IOV |
| else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5 && |
| (prop == PCI_EA_P_VF_MEM || prop == PCI_EA_P_VF_MEM_PREFETCH)) |
| return &dev->resource[PCI_IOV_RESOURCES + |
| bei - PCI_EA_BEI_VF_BAR0]; |
| #endif |
| else if (bei == PCI_EA_BEI_ROM) |
| return &dev->resource[PCI_ROM_RESOURCE]; |
| else |
| return NULL; |
| } |
| |
| /* Read an Enhanced Allocation (EA) entry */ |
| static int pci_ea_read(struct pci_dev *dev, int offset) |
| { |
| struct resource *res; |
| int ent_size, ent_offset = offset; |
| resource_size_t start, end; |
| unsigned long flags; |
| u32 dw0, bei, base, max_offset; |
| u8 prop; |
| bool support_64 = (sizeof(resource_size_t) >= 8); |
| |
| pci_read_config_dword(dev, ent_offset, &dw0); |
| ent_offset += 4; |
| |
| /* Entry size field indicates DWORDs after 1st */ |
| ent_size = ((dw0 & PCI_EA_ES) + 1) << 2; |
| |
| if (!(dw0 & PCI_EA_ENABLE)) /* Entry not enabled */ |
| goto out; |
| |
| bei = (dw0 & PCI_EA_BEI) >> 4; |
| prop = (dw0 & PCI_EA_PP) >> 8; |
| |
| /* |
| * If the Property is in the reserved range, try the Secondary |
| * Property instead. |
| */ |
| if (prop > PCI_EA_P_BRIDGE_IO && prop < PCI_EA_P_MEM_RESERVED) |
| prop = (dw0 & PCI_EA_SP) >> 16; |
| if (prop > PCI_EA_P_BRIDGE_IO) |
| goto out; |
| |
| res = pci_ea_get_resource(dev, bei, prop); |
| if (!res) { |
| dev_err(&dev->dev, "Unsupported EA entry BEI: %u\n", bei); |
| goto out; |
| } |
| |
| flags = pci_ea_flags(dev, prop); |
| if (!flags) { |
| dev_err(&dev->dev, "Unsupported EA properties: %#x\n", prop); |
| goto out; |
| } |
| |
| /* Read Base */ |
| pci_read_config_dword(dev, ent_offset, &base); |
| start = (base & PCI_EA_FIELD_MASK); |
| ent_offset += 4; |
| |
| /* Read MaxOffset */ |
| pci_read_config_dword(dev, ent_offset, &max_offset); |
| ent_offset += 4; |
| |
| /* Read Base MSBs (if 64-bit entry) */ |
| if (base & PCI_EA_IS_64) { |
| u32 base_upper; |
| |
| pci_read_config_dword(dev, ent_offset, &base_upper); |
| ent_offset += 4; |
| |
| flags |= IORESOURCE_MEM_64; |
| |
| /* entry starts above 32-bit boundary, can't use */ |
| if (!support_64 && base_upper) |
| goto out; |
| |
| if (support_64) |
| start |= ((u64)base_upper << 32); |
| } |
| |
| end = start + (max_offset | 0x03); |
| |
| /* Read MaxOffset MSBs (if 64-bit entry) */ |
| if (max_offset & PCI_EA_IS_64) { |
| u32 max_offset_upper; |
| |
| pci_read_config_dword(dev, ent_offset, &max_offset_upper); |
| ent_offset += 4; |
| |
| flags |= IORESOURCE_MEM_64; |
| |
| /* entry too big, can't use */ |
| if (!support_64 && max_offset_upper) |
| goto out; |
| |
| if (support_64) |
| end += ((u64)max_offset_upper << 32); |
| } |
| |
| if (end < start) { |
| dev_err(&dev->dev, "EA Entry crosses address boundary\n"); |
| goto out; |
| } |
| |
| if (ent_size != ent_offset - offset) { |
| dev_err(&dev->dev, |
| "EA Entry Size (%d) does not match length read (%d)\n", |
| ent_size, ent_offset - offset); |
| goto out; |
| } |
| |
| res->name = pci_name(dev); |
| res->start = start; |
| res->end = end; |
| res->flags = flags; |
| |
| if (bei <= PCI_EA_BEI_BAR5) |
| dev_printk(KERN_DEBUG, &dev->dev, "BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n", |
| bei, res, prop); |
| else if (bei == PCI_EA_BEI_ROM) |
| dev_printk(KERN_DEBUG, &dev->dev, "ROM: %pR (from Enhanced Allocation, properties %#02x)\n", |
| res, prop); |
| else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5) |
| dev_printk(KERN_DEBUG, &dev->dev, "VF BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n", |
| bei - PCI_EA_BEI_VF_BAR0, res, prop); |
| else |
| dev_printk(KERN_DEBUG, &dev->dev, "BEI %d res: %pR (from Enhanced Allocation, properties %#02x)\n", |
| bei, res, prop); |
| |
| out: |
| return offset + ent_size; |
| } |
| |
| /* Enhanced Allocation Initalization */ |
| void pci_ea_init(struct pci_dev *dev) |
| { |
| int ea; |
| u8 num_ent; |
| int offset; |
| int i; |
| |
| /* find PCI EA capability in list */ |
| ea = pci_find_capability(dev, PCI_CAP_ID_EA); |
| if (!ea) |
| return; |
| |
| /* determine the number of entries */ |
| pci_bus_read_config_byte(dev->bus, dev->devfn, ea + PCI_EA_NUM_ENT, |
| &num_ent); |
| num_ent &= PCI_EA_NUM_ENT_MASK; |
| |
| offset = ea + PCI_EA_FIRST_ENT; |
| |
| /* Skip DWORD 2 for type 1 functions */ |
| if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) |
| offset += 4; |
| |
| /* parse each EA entry */ |
| for (i = 0; i < num_ent; ++i) |
| offset = pci_ea_read(dev, offset); |
| } |
| |
| static void pci_add_saved_cap(struct pci_dev *pci_dev, |
| struct pci_cap_saved_state *new_cap) |
| { |
| hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space); |
| } |
| |
| /** |
| * _pci_add_cap_save_buffer - allocate buffer for saving given |
| * capability registers |
| * @dev: the PCI device |
| * @cap: the capability to allocate the buffer for |
| * @extended: Standard or Extended capability ID |
| * @size: requested size of the buffer |
| */ |
| static int _pci_add_cap_save_buffer(struct pci_dev *dev, u16 cap, |
| bool extended, unsigned int size) |
| { |
| int pos; |
| struct pci_cap_saved_state *save_state; |
| |
| if (extended) |
| pos = pci_find_ext_capability(dev, cap); |
| else |
| pos = pci_find_capability(dev, cap); |
| |
| if (!pos) |
| return 0; |
| |
| save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL); |
| if (!save_state) |
| return -ENOMEM; |
| |
| save_state->cap.cap_nr = cap; |
| save_state->cap.cap_extended = extended; |
| save_state->cap.size = size; |
| pci_add_saved_cap(dev, save_state); |
| |
| return 0; |
| } |
| |
| int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size) |
| { |
| return _pci_add_cap_save_buffer(dev, cap, false, size); |
| } |
| |
| int pci_add_ext_cap_save_buffer(struct pci_dev *dev, u16 cap, unsigned int size) |
| { |
| return _pci_add_cap_save_buffer(dev, cap, true, size); |
| } |
| |
| /** |
| * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities |
| * @dev: the PCI device |
| */ |
| void pci_allocate_cap_save_buffers(struct pci_dev *dev) |
| { |
| int error; |
| |
| error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP, |
| PCI_EXP_SAVE_REGS * sizeof(u16)); |
| if (error) |
| dev_err(&dev->dev, |
| "unable to preallocate PCI Express save buffer\n"); |
| |
| error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_PCIX, sizeof(u16)); |
| if (error) |
| dev_err(&dev->dev, |
| "unable to preallocate PCI-X save buffer\n"); |
| |
| pci_allocate_vc_save_buffers(dev); |
| } |
| |
| void pci_free_cap_save_buffers(struct pci_dev *dev) |
| { |
| struct pci_cap_saved_state *tmp; |
| struct hlist_node *n; |
| |
| hlist_for_each_entry_safe(tmp, n, &dev->saved_cap_space, next) |
| kfree(tmp); |
| } |
| |
| /** |
| * pci_configure_ari - enable or disable ARI forwarding |
| * @dev: the PCI device |
| * |
| * If @dev and its upstream bridge both support ARI, enable ARI in the |
| * bridge. Otherwise, disable ARI in the bridge. |
| */ |
| void pci_configure_ari(struct pci_dev *dev) |
| { |
| u32 cap; |
| struct pci_dev *bridge; |
| |
| if (pcie_ari_disabled || !pci_is_pcie(dev) || dev->devfn) |
| return; |
| |
| bridge = dev->bus->self; |
| if (!bridge) |
| return; |
| |
| pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &cap); |
| if (!(cap & PCI_EXP_DEVCAP2_ARI)) |
| return; |
| |
| if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) { |
| pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2, |
| PCI_EXP_DEVCTL2_ARI); |
| bridge->ari_enabled = 1; |
| } else { |
| pcie_capability_clear_word(bridge, PCI_EXP_DEVCTL2, |
| PCI_EXP_DEVCTL2_ARI); |
| bridge->ari_enabled = 0; |
| } |
| } |
| |
| static int pci_acs_enable; |
| |
| /** |
| * pci_request_acs - ask for ACS to be enabled if supported |
| */ |
| void pci_request_acs(void) |
| { |
| pci_acs_enable = 1; |
| } |
| |
| /** |
| * pci_std_enable_acs - enable ACS on devices using standard ACS capabilites |
| * @dev: the PCI device |
| */ |
| static int pci_std_enable_acs(struct pci_dev *dev) |
| { |
| int pos; |
| u16 cap; |
| u16 ctrl; |
| |
| pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); |
| if (!pos) |
| return -ENODEV; |
| |
| pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap); |
| pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl); |
| |
| /* Source Validation */ |
| ctrl |= (cap & PCI_ACS_SV); |
| |
| /* P2P Request Redirect */ |
| ctrl |= (cap & PCI_ACS_RR); |
| |
| /* P2P Completion Redirect */ |
| ctrl |= (cap & PCI_ACS_CR); |
| |
| /* Upstream Forwarding */ |
| ctrl |= (cap & PCI_ACS_UF); |
| |
| pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl); |
| |
| return 0; |
| } |
| |
| /** |
| * pci_enable_acs - enable ACS if hardware support it |
| * @dev: the PCI device |
| */ |
| void pci_enable_acs(struct pci_dev *dev) |
| { |
| if (!pci_acs_enable) |
| return; |
| |
| if (!pci_std_enable_acs(dev)) |
| return; |
| |
| pci_dev_specific_enable_acs(dev); |
| } |
| |
| static bool pci_acs_flags_enabled(struct pci_dev *pdev, u16 acs_flags) |
| { |
| int pos; |
| u16 cap, ctrl; |
| |
| pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ACS); |
| if (!pos) |
| return false; |
| |
| /* |
| * Except for egress control, capabilities are either required |
| * or only required if controllable. Features missing from the |
| * capability field can therefore be assumed as hard-wired enabled. |
| */ |
| pci_read_config_word(pdev, pos + PCI_ACS_CAP, &cap); |
| acs_flags &= (cap | PCI_ACS_EC); |
| |
| pci_read_config_word(pdev, pos + PCI_ACS_CTRL, &ctrl); |
| return (ctrl & acs_flags) == acs_flags; |
| } |
| |
| /** |
| * pci_acs_enabled - test ACS against required flags for a given device |
| * @pdev: device to test |
| * @acs_flags: required PCI ACS flags |
| * |
| * Return true if the device supports the provided flags. Automatically |
| * filters out flags that are not implemented on multifunction devices. |
| * |
| * Note that this interface checks the effective ACS capabilities of the |
| * device rather than the actual capabilities. For instance, most single |
| * function endpoints are not required to support ACS because they have no |
| * opportunity for peer-to-peer access. We therefore return 'true' |
| * regardless of whether the device exposes an ACS capability. This makes |
| * it much easier for callers of this function to ignore the actual type |
| * or topology of the device when testing ACS support. |
| */ |
| bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags) |
| { |
| int ret; |
| |
| ret = pci_dev_specific_acs_enabled(pdev, acs_flags); |
| if (ret >= 0) |
| return ret > 0; |
| |
| /* |
| * Conventional PCI and PCI-X devices never support ACS, either |
| * effectively or actually. The shared bus topology implies that |
| * any device on the bus can receive or snoop DMA. |
| */ |
| if (!pci_is_pcie(pdev)) |
| return false; |
| |
| switch (pci_pcie_type(pdev)) { |
| /* |
| * PCI/X-to-PCIe bridges are not specifically mentioned by the spec, |
| * but since their primary interface is PCI/X, we conservatively |
| * handle them as we would a non-PCIe device. |
| */ |
| case PCI_EXP_TYPE_PCIE_BRIDGE: |
| /* |
| * PCIe 3.0, 6.12.1 excludes ACS on these devices. "ACS is never |
| * applicable... must never implement an ACS Extended Capability...". |
| * This seems arbitrary, but we take a conservative interpretation |
| * of this statement. |
| */ |
| case PCI_EXP_TYPE_PCI_BRIDGE: |
| case PCI_EXP_TYPE_RC_EC: |
| return false; |
| /* |
| * PCIe 3.0, 6.12.1.1 specifies that downstream and root ports should |
| * implement ACS in order to indicate their peer-to-peer capabilities, |
| * regardless of whether they are single- or multi-function devices. |
| */ |
| case PCI_EXP_TYPE_DOWNSTREAM: |
| case PCI_EXP_TYPE_ROOT_PORT: |
| return pci_acs_flags_enabled(pdev, acs_flags); |
| /* |
| * PCIe 3.0, 6.12.1.2 specifies ACS capabilities that should be |
| * implemented by the remaining PCIe types to indicate peer-to-peer |
| * capabilities, but only when they are part of a multifunction |
| * device. The footnote for section 6.12 indicates the specific |
| * PCIe types included here. |
| */ |
| case PCI_EXP_TYPE_ENDPOINT: |
| case PCI_EXP_TYPE_UPSTREAM: |
| case PCI_EXP_TYPE_LEG_END: |
| case PCI_EXP_TYPE_RC_END: |
| if (!pdev->multifunction) |
| break; |
| |
| return pci_acs_flags_enabled(pdev, acs_flags); |
| } |
| |
| /* |
| * PCIe 3.0, 6.12.1.3 specifies no ACS capabilities are applicable |
| * to single function devices with the exception of downstream ports. |
| */ |
| return true; |
| } |
| |
| /** |
| * pci_acs_path_enable - test ACS flags from start to end in a hierarchy |
| * @start: starting downstream device |
| * @end: ending upstream device or NULL to search to the root bus |
| * @acs_flags: required flags |
| * |
| * Walk up a device tree from start to end testing PCI ACS support. If |
| * any step along the way does not support the required flags, return false. |
| */ |
| bool pci_acs_path_enabled(struct pci_dev *start, |
| struct pci_dev *end, u16 acs_flags) |
| { |
| struct pci_dev *pdev, *parent = start; |
| |
| do { |
| pdev = parent; |
| |
| if (!pci_acs_enabled(pdev, acs_flags)) |
| return false; |
| |
| if (pci_is_root_bus(pdev->bus)) |
| return (end == NULL); |
| |
| parent = pdev->bus->self; |
| } while (pdev != end); |
| |
| return true; |
| } |
| |
| /** |
| * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge |
| * @dev: the PCI device |
| * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTC, 4=INTD) |
| * |
| * Perform INTx swizzling for a device behind one level of bridge. This is |
| * required by section 9.1 of the PCI-to-PCI bridge specification for devices |
| * behind bridges on add-in cards. For devices with ARI enabled, the slot |
| * number is always 0 (see the Implementation Note in section 2.2.8.1 of |
| * the PCI Express Base Specification, Revision 2.1) |
| */ |
| u8 pci_swizzle_interrupt_pin(const struct pci_dev *dev, u8 pin) |
| { |
| int slot; |
| |
| if (pci_ari_enabled(dev->bus)) |
| slot = 0; |
| else |
| slot = PCI_SLOT(dev->devfn); |
| |
| return (((pin - 1) + slot) % 4) + 1; |
| } |
| |
| int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge) |
| { |
| u8 pin; |
| |
| pin = dev->pin; |
| if (!pin) |
| return -1; |
| |
| while (!pci_is_root_bus(dev->bus)) { |
| pin = pci_swizzle_interrupt_pin(dev, pin); |
| dev = dev->bus->self; |
| } |
| *bridge = dev; |
| return pin; |
| } |
| |
| /** |
| * pci_common_swizzle - swizzle INTx all the way to root bridge |
| * @dev: the PCI device |
| * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD) |
| * |
| * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI |
| * bridges all the way up to a PCI root bus. |
| */ |
| u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp) |
| { |
| u8 pin = *pinp; |
| |
| while (!pci_is_root_bus(dev->bus)) { |
| pin = pci_swizzle_interrupt_pin(dev, pin); |
| dev = dev->bus->self; |
| } |
| *pinp = pin; |
| return PCI_SLOT(dev->devfn); |
| } |
| EXPORT_SYMBOL_GPL(pci_common_swizzle); |
| |
| /** |
| * pci_release_region - Release a PCI bar |
| * @pdev: PCI device whose resources were previously reserved by pci_request_region |
| * @bar: BAR to release |
| * |
| * Releases the PCI I/O and memory resources previously reserved by a |
| * successful call to pci_request_region. Call this function only |
| * after all use of the PCI regions has ceased. |
| */ |
| void pci_release_region(struct pci_dev *pdev, int bar) |
| { |
| struct pci_devres *dr; |
| |
| if (pci_resource_len(pdev, bar) == 0) |
| return; |
| if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) |
| release_region(pci_resource_start(pdev, bar), |
| pci_resource_len(pdev, bar)); |
| else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) |
| release_mem_region(pci_resource_start(pdev, bar), |
| pci_resource_len(pdev, bar)); |
| |
| dr = find_pci_dr(pdev); |
| if (dr) |
| dr->region_mask &= ~(1 << bar); |
| } |
| EXPORT_SYMBOL(pci_release_region); |
| |
| /** |
| * __pci_request_region - Reserved PCI I/O and memory resource |
| * @pdev: PCI device whose resources are to be reserved |
| * @bar: BAR to be reserved |
| * @res_name: Name to be associated with resource. |
| * @exclusive: whether the region access is exclusive or not |
| * |
| * Mark the PCI region associated with PCI device @pdev BR @bar as |
| * being reserved by owner @res_name. Do not access any |
| * address inside the PCI regions unless this call returns |
| * successfully. |
| * |
| * If @exclusive is set, then the region is marked so that userspace |
| * is explicitly not allowed to map the resource via /dev/mem or |
| * sysfs MMIO access. |
| * |
| * Returns 0 on success, or %EBUSY on error. A warning |
| * message is also printed on failure. |
| */ |
| static int __pci_request_region(struct pci_dev *pdev, int bar, |
| const char *res_name, int exclusive) |
| { |
| struct pci_devres *dr; |
| |
| if (pci_resource_len(pdev, bar) == 0) |
| return 0; |
| |
| if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) { |
| if (!request_region(pci_resource_start(pdev, bar), |
| pci_resource_len(pdev, bar), res_name)) |
| goto err_out; |
| } else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) { |
| if (!__request_mem_region(pci_resource_start(pdev, bar), |
| pci_resource_len(pdev, bar), res_name, |
| exclusive)) |
| goto err_out; |
| } |
| |
| dr = find_pci_dr(pdev); |
| if (dr) |
| dr->region_mask |= 1 << bar; |
| |
| return 0; |
| |
| err_out: |
| dev_warn(&pdev->dev, "BAR %d: can't reserve %pR\n", bar, |
| &pdev->resource[bar]); |
| return -EBUSY; |
| } |
| |
| /** |
| * pci_request_region - Reserve PCI I/O and memory resource |
| * @pdev: PCI device whose resources are to be reserved |
| * @bar: BAR to be reserved |
| * @res_name: Name to be associated with resource |
| * |
| * Mark the PCI region associated with PCI device @pdev BAR @bar as |
| * being reserved by owner @res_name. Do not access any |
| * address inside the PCI regions unless this call returns |
| * successfully. |
| * |
| * Returns 0 on success, or %EBUSY on error. A warning |
| * message is also printed on failure. |
| */ |
| int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name) |
| { |
| return __pci_request_region(pdev, bar, res_name, 0); |
| } |
| EXPORT_SYMBOL(pci_request_region); |
| |
| /** |
| * pci_request_region_exclusive - Reserved PCI I/O and memory resource |
| * @pdev: PCI device whose resources are to be reserved |
| * @bar: BAR to be reserved |
| * @res_name: Name to be associated with resource. |
| * |
| * Mark the PCI region associated with PCI device @pdev BR @bar as |
| * being reserved by owner @res_name. Do not access any |
| * address inside the PCI regions unless this call returns |
| * successfully. |
| * |
| * Returns 0 on success, or %EBUSY on error. A warning |
| * message is also printed on failure. |
| * |
| * The key difference that _exclusive makes it that userspace is |
| * explicitly not allowed to map the resource via /dev/mem or |
| * sysfs. |
| */ |
| int pci_request_region_exclusive(struct pci_dev *pdev, int bar, |
| const char *res_name) |
| { |
| return __pci_request_region(pdev, bar, res_name, IORESOURCE_EXCLUSIVE); |
| } |
| EXPORT_SYMBOL(pci_request_region_exclusive); |
| |
| /** |
| * pci_release_selected_regions - Release selected PCI I/O and memory resources |
| * @pdev: PCI device whose resources were previously reserved |
| * @bars: Bitmask of BARs to be released |
| * |
| * Release selected PCI I/O and memory resources previously reserved. |
| * Call this function only after all use of the PCI regions has ceased. |
| */ |
| void pci_release_selected_regions(struct pci_dev *pdev, int bars) |
| { |
| int i; |
| |
| for (i = 0; i < 6; i++) |
| if (bars & (1 << i)) |
| pci_release_region(pdev, i); |
| } |
| EXPORT_SYMBOL(pci_release_selected_regions); |
| |
| static int __pci_request_selected_regions(struct pci_dev *pdev, int bars, |
| const char *res_name, int excl) |
| { |
| int i; |
| |
| for (i = 0; i < 6; i++) |
| if (bars & (1 << i)) |
| if (__pci_request_region(pdev, i, res_name, excl)) |
| goto err_out; |
| return 0; |
| |
| err_out: |
| while (--i >= 0) |
| if (bars & (1 << i)) |
| pci_release_region(pdev, i); |
| |
| return -EBUSY; |
| } |
| |
| |
| /** |
| * pci_request_selected_regions - Reserve selected PCI I/O and memory resources |
| * @pdev: PCI device whose resources are to be reserved |
| * @bars: Bitmask of BARs to be requested |
| * @res_name: Name to be associated with resource |
| */ |
| int pci_request_selected_regions(struct pci_dev *pdev, int bars, |
| const char *res_name) |
| { |
| return __pci_request_selected_regions(pdev, bars, res_name, 0); |
| } |
| EXPORT_SYMBOL(pci_request_selected_regions); |
| |
| int pci_request_selected_regions_exclusive(struct pci_dev *pdev, int bars, |
| const char *res_name) |
| { |
| return __pci_request_selected_regions(pdev, bars, res_name, |
| IORESOURCE_EXCLUSIVE); |
| } |
| EXPORT_SYMBOL(pci_request_selected_regions_exclusive); |
| |
| /** |
| * pci_release_regions - Release reserved PCI I/O and memory resources |
| * @pdev: PCI device whose resources were previously reserved by pci_request_regions |
| * |
| * Releases all PCI I/O and memory resources previously reserved by a |
| * successful call to pci_request_regions. Call this function only |
| * after all use of the PCI regions has ceased. |
| */ |
| |
| void pci_release_regions(struct pci_dev *pdev) |
| { |
| pci_release_selected_regions(pdev, (1 << 6) - 1); |
| } |
| EXPORT_SYMBOL(pci_release_regions); |
| |
| /** |
| * pci_request_regions - Reserved PCI I/O and memory resources |
| * @pdev: PCI device whose resources are to be reserved |
| * @res_name: Name to be associated with resource. |
| * |
| * Mark all PCI regions associated with PCI device @pdev as |
| * being reserved by owner @res_name. Do not access any |
| * address inside the PCI regions unless this call returns |
| * successfully. |
| * |
| * Returns 0 on success, or %EBUSY on error. A warning |
| * message is also printed on failure. |
| */ |
| int pci_request_regions(struct pci_dev *pdev, const char *res_name) |
| { |
| return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name); |
| } |
| EXPORT_SYMBOL(pci_request_regions); |
| |
| /** |
| * pci_request_regions_exclusive - Reserved PCI I/O and memory resources |
| * @pdev: PCI device whose resources are to be reserved |
| * @res_name: Name to be associated with resource. |
| * |
| * Mark all PCI regions associated with PCI device @pdev as |
| * being reserved by owner @res_name. Do not access any |
| * address inside the PCI regions unless this call returns |
| * successfully. |
| * |
| * pci_request_regions_exclusive() will mark the region so that |
| * /dev/mem and the sysfs MMIO access will not be allowed. |
| * |
| * Returns 0 on success, or %EBUSY on error. A warning |
| * message is also printed on failure. |
| */ |
| int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) |
| { |
| return pci_request_selected_regions_exclusive(pdev, |
| ((1 << 6) - 1), res_name); |
| } |
| EXPORT_SYMBOL(pci_request_regions_exclusive); |
| |
| /** |
| * pci_remap_iospace - Remap the memory mapped I/O space |
| * @res: Resource describing the I/O space |
| * @phys_addr: physical address of range to be mapped |
| * |
| * Remap the memory mapped I/O space described by the @res |
| * and the CPU physical address @phys_addr into virtual address space. |
| * Only architectures that have memory mapped IO functions defined |
| * (and the PCI_IOBASE value defined) should call this function. |
| */ |
| int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr) |
| { |
| #if defined(PCI_IOBASE) && defined(CONFIG_MMU) |
| unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start; |
| |
| if (!(res->flags & IORESOURCE_IO)) |
| return -EINVAL; |
| |
| if (res->end > IO_SPACE_LIMIT) |
| return -EINVAL; |
| |
| return ioremap_page_range(vaddr, vaddr + resource_size(res), phys_addr, |
| pgprot_device(PAGE_KERNEL)); |
| #else |
| /* this architecture does not have memory mapped I/O space, |
| so this function should never be called */ |
| WARN_ONCE(1, "This architecture does not support memory mapped I/O\n"); |
| return -ENODEV; |
| #endif |
| } |
| |
| static void __pci_set_master(struct pci_dev *dev, bool enable) |
| { |
| u16 old_cmd, cmd; |
| |
| pci_read_config_word(dev, PCI_COMMAND, &old_cmd); |
| if (enable) |
| cmd = old_cmd | PCI_COMMAND_MASTER; |
| else |
| cmd = old_cmd & ~PCI_COMMAND_MASTER; |
| if (cmd != old_cmd) { |
| dev_dbg(&dev->dev, "%s bus mastering\n", |
| enable ? "enabling" : "disabling"); |
| pci_write_config_word(dev, PCI_COMMAND, cmd); |
| } |
| dev->is_busmaster = enable; |
| } |
| |
| /** |
| * pcibios_setup - process "pci=" kernel boot arguments |
| * @str: string used to pass in "pci=" kernel boot arguments |
| * |
| * Process kernel boot arguments. This is the default implementation. |
| * Architecture specific implementations can override this as necessary. |
| */ |
| char * __weak __init pcibios_setup(char *str) |
| { |
| return str; |
| } |
| |
| /** |
| * pcibios_set_master - enable PCI bus-mastering for device dev |
| * @dev: the PCI device to enable |
| * |
| * Enables PCI bus-mastering for the device. This is the default |
| * implementation. Architecture specific implementations can override |
| * this if necessary. |
| */ |
| void __weak pcibios_set_master(struct pci_dev *dev) |
| { |
| u8 lat; |
| |
| /* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */ |
| if (pci_is_pcie(dev)) |
| return; |
| |
| pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat); |
| if (lat < 16) |
| lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency; |
| else if (lat > pcibios_max_latency) |
| lat = pcibios_max_latency; |
| else |
| return; |
| |
| pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat); |
| } |
| |
| /** |
| * pci_set_master - enables bus-mastering for device dev |
| * @dev: the PCI device to enable |
| * |
| * Enables bus-mastering on the device and calls pcibios_set_master() |
| * to do the needed arch specific settings. |
| */ |
| void pci_set_master(struct pci_dev *dev) |
| { |
| __pci_set_master(dev, true); |
| pcibios_set_master(dev); |
| } |
| EXPORT_SYMBOL(pci_set_master); |
| |
| /** |
| * pci_clear_master - disables bus-mastering for device dev |
| * @dev: the PCI device to disable |
| */ |
| void pci_clear_master(struct pci_dev *dev) |
| { |
| __pci_set_master(dev, false); |
| } |
| EXPORT_SYMBOL(pci_clear_master); |
| |
| /** |
| * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed |
| * @dev: the PCI device for which MWI is to be enabled |
| * |
| * Helper function for pci_set_mwi. |
| * Originally copied from drivers/net/acenic.c. |
| * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>. |
| * |
| * RETURNS: An appropriate -ERRNO error value on error, or zero for success. |
| */ |
| int pci_set_cacheline_size(struct pci_dev *dev) |
| { |
| u8 cacheline_size; |
| |
| if (!pci_cache_line_size) |
| return -EINVAL; |
| |
| /* Validate current setting: the PCI_CACHE_LINE_SIZE must be |
| equal to or multiple of the right value. */ |
| pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); |
| if (cacheline_size >= pci_cache_line_size && |
| (cacheline_size % pci_cache_line_size) == 0) |
| return 0; |
| |
| /* Write the correct value. */ |
| pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size); |
| /* Read it back. */ |
| pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); |
| if (cacheline_size == pci_cache_line_size) |
| return 0; |
| |
| dev_printk(KERN_DEBUG, &dev->dev, "cache line size of %d is not supported\n", |
| pci_cache_line_size << 2); |
| |
| return -EINVAL; |
| } |
| EXPORT_SYMBOL_GPL(pci_set_cacheline_size); |
| |
| /** |
| * pci_set_mwi - enables memory-write-invalidate PCI transaction |
| * @dev: the PCI device for which MWI is enabled |
| * |
| * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. |
| * |
| * RETURNS: An appropriate -ERRNO error value on error, or zero for success. |
| */ |
| int pci_set_mwi(struct pci_dev *dev) |
| { |
| #ifdef PCI_DISABLE_MWI |
| return 0; |
| #else |
| int rc; |
| u16 cmd; |
| |
| rc = pci_set_cacheline_size(dev); |
| if (rc) |
| return rc; |
| |
| pci_read_config_word(dev, PCI_COMMAND, &cmd); |
| if (!(cmd & PCI_COMMAND_INVALIDATE)) { |
| dev_dbg(&dev->dev, "enabling Mem-Wr-Inval\n"); |
| cmd |= PCI_COMMAND_INVALIDATE; |
| pci_write_config_word(dev, PCI_COMMAND, cmd); |
| } |
| return 0; |
| #endif |
| } |
| EXPORT_SYMBOL(pci_set_mwi); |
| |
| /** |
| * pci_try_set_mwi - enables memory-write-invalidate PCI transaction |
| * @dev: the PCI device for which MWI is enabled |
| * |
| * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. |
| * Callers are not required to check the return value. |
| * |
| * RETURNS: An appropriate -ERRNO error value on error, or zero for success. |
| */ |
| int pci_try_set_mwi(struct pci_dev *dev) |
| { |
| #ifdef PCI_DISABLE_MWI |
| return 0; |
| #else |
| return pci_set_mwi(dev); |
| #endif |
| } |
| EXPORT_SYMBOL(pci_try_set_mwi); |
| |
| /** |
| * pci_clear_mwi - disables Memory-Write-Invalidate for device dev |
| * @dev: the PCI device to disable |
| * |
| * Disables PCI Memory-Write-Invalidate transaction on the device |
| */ |
| void pci_clear_mwi(struct pci_dev *dev) |
| { |
| #ifndef PCI_DISABLE_MWI |
| u16 cmd; |
| |
| pci_read_config_word(dev, PCI_COMMAND, &cmd); |
| if (cmd & PCI_COMMAND_INVALIDATE) { |
| cmd &= ~PCI_COMMAND_INVALIDATE; |
| pci_write_config_word(dev, PCI_COMMAND, cmd); |
| } |
| #endif |
| } |
| EXPORT_SYMBOL(pci_clear_mwi); |
| |
| /** |
| * pci_intx - enables/disables PCI INTx for device dev |
| * @pdev: the PCI device to operate on |
| * @enable: boolean: whether to enable or disable PCI INTx |
| * |
| * Enables/disables PCI INTx for device dev |
| */ |
| void pci_intx(struct pci_dev *pdev, int enable) |
| { |
| u16 pci_command, new; |
| |
| pci_read_config_word(pdev, PCI_COMMAND, &pci_command); |
| |
| if (enable) |
| new = pci_command & ~PCI_COMMAND_INTX_DISABLE; |
| else |
| new = pci_command | PCI_COMMAND_INTX_DISABLE; |
| |
| if (new != pci_command) { |
| struct pci_devres *dr; |
| |
| pci_write_config_word(pdev, PCI_COMMAND, new); |
| |
| dr = find_pci_dr(pdev); |
| if (dr && !dr->restore_intx) { |
| dr->restore_intx = 1; |
| dr->orig_intx = !enable; |
| } |
| } |
| } |
| EXPORT_SYMBOL_GPL(pci_intx); |
| |
| /** |
| * pci_intx_mask_supported - probe for INTx masking support |
| * @dev: the PCI device to operate on |
| * |
| * Check if the device dev support INTx masking via the config space |
| * command word. |
| */ |
| bool pci_intx_mask_supported(struct pci_dev *dev) |
| { |
| bool mask_supported = false; |
| u16 orig, new; |
| |
| if (dev->broken_intx_masking) |
| return false; |
| |
| pci_cfg_access_lock(dev); |
| |
| pci_read_config_word(dev, PCI_COMMAND, &orig); |
| pci_write_config_word(dev, PCI_COMMAND, |
| orig ^ PCI_COMMAND_INTX_DISABLE); |
| pci_read_config_word(dev, PCI_COMMAND, &new); |
| |
| /* |
| * There's no way to protect against hardware bugs or detect them |
| * reliably, but as long as we know what the value should be, let's |
| * go ahead and check it. |
| */ |
| if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) { |
| dev_err(&dev->dev, "Command register changed from 0x%x to 0x%x: driver or hardware bug?\n", |
| orig, new); |
| } else if ((new ^ orig) & PCI_COMMAND_INTX_DISABLE) { |
| mask_supported = true; |
| pci_write_config_word(dev, PCI_COMMAND, orig); |
| } |
| |
| pci_cfg_access_unlock(dev); |
| return mask_supported; |
| } |
| EXPORT_SYMBOL_GPL(pci_intx_mask_supported); |
| |
| static bool pci_check_and_set_intx_mask(struct pci_dev *dev, bool mask) |
| { |
| struct pci_bus *bus = dev->bus; |
| bool mask_updated = true; |
| u32 cmd_status_dword; |
| u16 origcmd, newcmd; |
| unsigned long flags; |
| bool irq_pending; |
| |
| /* |
| * We do a single dword read to retrieve both command and status. |
| * Document assumptions that make this possible. |
| */ |
| BUILD_BUG_ON(PCI_COMMAND % 4); |
| BUILD_BUG_ON(PCI_COMMAND + 2 != PCI_STATUS); |
| |
| raw_spin_lock_irqsave(&pci_lock, flags); |
| |
| bus->ops->read(bus, dev->devfn, PCI_COMMAND, 4, &cmd_status_dword); |
| |
| irq_pending = (cmd_status_dword >> 16) & PCI_STATUS_INTERRUPT; |
| |
| /* |
| * Check interrupt status register to see whether our device |
| * triggered the interrupt (when masking) or the next IRQ is |
| * already pending (when unmasking). |
| */ |
| if (mask != irq_pending) { |
| mask_updated = false; |
| goto done; |
| } |
| |
| origcmd = cmd_status_dword; |
| newcmd = origcmd & ~PCI_COMMAND_INTX_DISABLE; |
| if (mask) |
| newcmd |= PCI_COMMAND_INTX_DISABLE; |
| if (newcmd != origcmd) |
| bus->ops->write(<
|