| /* |
| * Procfs interface for the PCI bus. |
| * |
| * Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz> |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/pci.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/smp_lock.h> |
| #include <linux/capability.h> |
| #include <asm/uaccess.h> |
| #include <asm/byteorder.h> |
| #include "pci.h" |
| |
| static int proc_initialized; /* = 0 */ |
| |
| static loff_t |
| proc_bus_pci_lseek(struct file *file, loff_t off, int whence) |
| { |
| loff_t new = -1; |
| struct inode *inode = file->f_path.dentry->d_inode; |
| |
| mutex_lock(&inode->i_mutex); |
| switch (whence) { |
| case 0: |
| new = off; |
| break; |
| case 1: |
| new = file->f_pos + off; |
| break; |
| case 2: |
| new = inode->i_size + off; |
| break; |
| } |
| if (new < 0 || new > inode->i_size) |
| new = -EINVAL; |
| else |
| file->f_pos = new; |
| mutex_unlock(&inode->i_mutex); |
| return new; |
| } |
| |
| static ssize_t |
| proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) |
| { |
| const struct inode *ino = file->f_path.dentry->d_inode; |
| const struct proc_dir_entry *dp = PDE(ino); |
| struct pci_dev *dev = dp->data; |
| unsigned int pos = *ppos; |
| unsigned int cnt, size; |
| |
| /* |
| * Normal users can read only the standardized portion of the |
| * configuration space as several chips lock up when trying to read |
| * undefined locations (think of Intel PIIX4 as a typical example). |
| */ |
| |
| if (capable(CAP_SYS_ADMIN)) |
| size = dp->size; |
| else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) |
| size = 128; |
| else |
| size = 64; |
| |
| if (pos >= size) |
| return 0; |
| if (nbytes >= size) |
| nbytes = size; |
| if (pos + nbytes > size) |
| nbytes = size - pos; |
| cnt = nbytes; |
| |
| if (!access_ok(VERIFY_WRITE, buf, cnt)) |
| return -EINVAL; |
| |
| if ((pos & 1) && cnt) { |
| unsigned char val; |
| pci_user_read_config_byte(dev, pos, &val); |
| __put_user(val, buf); |
| buf++; |
| pos++; |
| cnt--; |
| } |
| |
| if ((pos & 3) && cnt > 2) { |
| unsigned short val; |
| pci_user_read_config_word(dev, pos, &val); |
| __put_user(cpu_to_le16(val), (__le16 __user *) buf); |
| buf += 2; |
| pos += 2; |
| cnt -= 2; |
| } |
| |
| while (cnt >= 4) { |
| unsigned int val; |
| pci_user_read_config_dword(dev, pos, &val); |
| __put_user(cpu_to_le32(val), (__le32 __user *) buf); |
| buf += 4; |
| pos += 4; |
| cnt -= 4; |
| } |
| |
| if (cnt >= 2) { |
| unsigned short val; |
| pci_user_read_config_word(dev, pos, &val); |
| __put_user(cpu_to_le16(val), (__le16 __user *) buf); |
| buf += 2; |
| pos += 2; |
| cnt -= 2; |
| } |
| |
| if (cnt) { |
| unsigned char val; |
| pci_user_read_config_byte(dev, pos, &val); |
| __put_user(val, buf); |
| buf++; |
| pos++; |
| cnt--; |
| } |
| |
| *ppos = pos; |
| return nbytes; |
| } |
| |
| static ssize_t |
| proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos) |
| { |
| struct inode *ino = file->f_path.dentry->d_inode; |
| const struct proc_dir_entry *dp = PDE(ino); |
| struct pci_dev *dev = dp->data; |
| int pos = *ppos; |
| int size = dp->size; |
| int cnt; |
| |
| if (pos >= size) |
| return 0; |
| if (nbytes >= size) |
| nbytes = size; |
| if (pos + nbytes > size) |
| nbytes = size - pos; |
| cnt = nbytes; |
| |
| if (!access_ok(VERIFY_READ, buf, cnt)) |
| return -EINVAL; |
| |
| if ((pos & 1) && cnt) { |
| unsigned char val; |
| __get_user(val, buf); |
| pci_user_write_config_byte(dev, pos, val); |
| buf++; |
| pos++; |
| cnt--; |
| } |
| |
| if ((pos & 3) && cnt > 2) { |
| __le16 val; |
| __get_user(val, (__le16 __user *) buf); |
| pci_user_write_config_word(dev, pos, le16_to_cpu(val)); |
| buf += 2; |
| pos += 2; |
| cnt -= 2; |
| } |
| |
| while (cnt >= 4) { |
| __le32 val; |
| __get_user(val, (__le32 __user *) buf); |
| pci_user_write_config_dword(dev, pos, le32_to_cpu(val)); |
| buf += 4; |
| pos += 4; |
| cnt -= 4; |
| } |
| |
| if (cnt >= 2) { |
| __le16 val; |
| __get_user(val, (__le16 __user *) buf); |
| pci_user_write_config_word(dev, pos, le16_to_cpu(val)); |
| buf += 2; |
| pos += 2; |
| cnt -= 2; |
| } |
| |
| if (cnt) { |
| unsigned char val; |
| __get_user(val, buf); |
| pci_user_write_config_byte(dev, pos, val); |
| buf++; |
| pos++; |
| cnt--; |
| } |
| |
| *ppos = pos; |
| i_size_write(ino, dp->size); |
| return nbytes; |
| } |
| |
| struct pci_filp_private { |
| enum pci_mmap_state mmap_state; |
| int write_combine; |
| }; |
| |
| static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd, |
| unsigned long arg) |
| { |
| const struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); |
| struct pci_dev *dev = dp->data; |
| #ifdef HAVE_PCI_MMAP |
| struct pci_filp_private *fpriv = file->private_data; |
| #endif /* HAVE_PCI_MMAP */ |
| int ret = 0; |
| |
| lock_kernel(); |
| |
| switch (cmd) { |
| case PCIIOC_CONTROLLER: |
| ret = pci_domain_nr(dev->bus); |
| break; |
| |
| #ifdef HAVE_PCI_MMAP |
| case PCIIOC_MMAP_IS_IO: |
| fpriv->mmap_state = pci_mmap_io; |
| break; |
| |
| case PCIIOC_MMAP_IS_MEM: |
| fpriv->mmap_state = pci_mmap_mem; |
| break; |
| |
| case PCIIOC_WRITE_COMBINE: |
| if (arg) |
| fpriv->write_combine = 1; |
| else |
| fpriv->write_combine = 0; |
| break; |
| |
| #endif /* HAVE_PCI_MMAP */ |
| |
| default: |
| ret = -EINVAL; |
| break; |
| }; |
| |
| unlock_kernel(); |
| return ret; |
| } |
| |
| #ifdef HAVE_PCI_MMAP |
| static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| struct inode *inode = file->f_path.dentry->d_inode; |
| const struct proc_dir_entry *dp = PDE(inode); |
| struct pci_dev *dev = dp->data; |
| struct pci_filp_private *fpriv = file->private_data; |
| int i, ret; |
| |
| if (!capable(CAP_SYS_RAWIO)) |
| return -EPERM; |
| |
| /* Make sure the caller is mapping a real resource for this device */ |
| for (i = 0; i < PCI_ROM_RESOURCE; i++) { |
| if (pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS)) |
| break; |
| } |
| |
| if (i >= PCI_ROM_RESOURCE) |
| return -ENODEV; |
| |
| ret = pci_mmap_page_range(dev, vma, |
| fpriv->mmap_state, |
| fpriv->write_combine); |
| if (ret < 0) |
| return ret; |
| |
| return 0; |
| } |
| |
| static int proc_bus_pci_open(struct inode *inode, struct file *file) |
| { |
| struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); |
| |
| if (!fpriv) |
| return -ENOMEM; |
| |
| fpriv->mmap_state = pci_mmap_io; |
| fpriv->write_combine = 0; |
| |
| file->private_data = fpriv; |
| |
| return 0; |
| } |
| |
| static int proc_bus_pci_release(struct inode *inode, struct file *file) |
| { |
| kfree(file->private_data); |
| file->private_data = NULL; |
| |
| return 0; |
| } |
| #endif /* HAVE_PCI_MMAP */ |
| |
| static const struct file_operations proc_bus_pci_operations = { |
| .owner = THIS_MODULE, |
| .llseek = proc_bus_pci_lseek, |
| .read = proc_bus_pci_read, |
| .write = proc_bus_pci_write, |
| .unlocked_ioctl = proc_bus_pci_ioctl, |
| #ifdef HAVE_PCI_MMAP |
| .open = proc_bus_pci_open, |
| .release = proc_bus_pci_release, |
| .mmap = proc_bus_pci_mmap, |
| #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA |
| .get_unmapped_area = get_pci_unmapped_area, |
| #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ |
| #endif /* HAVE_PCI_MMAP */ |
| }; |
| |
| /* iterator */ |
| static void *pci_seq_start(struct seq_file *m, loff_t *pos) |
| { |
| struct pci_dev *dev = NULL; |
| loff_t n = *pos; |
| |
| for_each_pci_dev(dev) { |
| if (!n--) |
| break; |
| } |
| return dev; |
| } |
| |
| static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) |
| { |
| struct pci_dev *dev = v; |
| |
| (*pos)++; |
| dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); |
| return dev; |
| } |
| |
| static void pci_seq_stop(struct seq_file *m, void *v) |
| { |
| if (v) { |
| struct pci_dev *dev = v; |
| pci_dev_put(dev); |
| } |
| } |
| |
| static int show_device(struct seq_file *m, void *v) |
| { |
| const struct pci_dev *dev = v; |
| const struct pci_driver *drv; |
| int i; |
| |
| if (dev == NULL) |
| return 0; |
| |
| drv = pci_dev_driver(dev); |
| seq_printf(m, "%02x%02x\t%04x%04x\t%x", |
| dev->bus->number, |
| dev->devfn, |
| dev->vendor, |
| dev->device, |
| dev->irq); |
| |
| /* only print standard and ROM resources to preserve compatibility */ |
| for (i = 0; i <= PCI_ROM_RESOURCE; i++) { |
| resource_size_t start, end; |
| pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
| seq_printf(m, "\t%16llx", |
| (unsigned long long)(start | |
| (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); |
| } |
| for (i = 0; i <= PCI_ROM_RESOURCE; i++) { |
| resource_size_t start, end; |
| pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
| seq_printf(m, "\t%16llx", |
| dev->resource[i].start < dev->resource[i].end ? |
| (unsigned long long)(end - start) + 1 : 0); |
| } |
| seq_putc(m, '\t'); |
| if (drv) |
| seq_printf(m, "%s", drv->name); |
| seq_putc(m, '\n'); |
| return 0; |
| } |
| |
| static const struct seq_operations proc_bus_pci_devices_op = { |
| .start = pci_seq_start, |
| .next = pci_seq_next, |
| .stop = pci_seq_stop, |
| .show = show_device |
| }; |
| |
| static struct proc_dir_entry *proc_bus_pci_dir; |
| |
| int pci_proc_attach_device(struct pci_dev *dev) |
| { |
| struct pci_bus *bus = dev->bus; |
| struct proc_dir_entry *e; |
| char name[16]; |
| |
| if (!proc_initialized) |
| return -EACCES; |
| |
| if (!bus->procdir) { |
| if (pci_proc_domain(bus)) { |
| sprintf(name, "%04x:%02x", pci_domain_nr(bus), |
| bus->number); |
| } else { |
| sprintf(name, "%02x", bus->number); |
| } |
| bus->procdir = proc_mkdir(name, proc_bus_pci_dir); |
| if (!bus->procdir) |
| return -ENOMEM; |
| } |
| |
| sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); |
| e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir, |
| &proc_bus_pci_operations, dev); |
| if (!e) |
| return -ENOMEM; |
| e->size = dev->cfg_size; |
| dev->procent = e; |
| |
| return 0; |
| } |
| |
| int pci_proc_detach_device(struct pci_dev *dev) |
| { |
| struct proc_dir_entry *e; |
| |
| if ((e = dev->procent)) { |
| if (atomic_read(&e->count) > 1) |
| return -EBUSY; |
| remove_proc_entry(e->name, dev->bus->procdir); |
| dev->procent = NULL; |
| } |
| return 0; |
| } |
| |
| #if 0 |
| int pci_proc_attach_bus(struct pci_bus* bus) |
| { |
| struct proc_dir_entry *de = bus->procdir; |
| |
| if (!proc_initialized) |
| return -EACCES; |
| |
| if (!de) { |
| char name[16]; |
| sprintf(name, "%02x", bus->number); |
| de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir); |
| if (!de) |
| return -ENOMEM; |
| } |
| return 0; |
| } |
| #endif /* 0 */ |
| |
| int pci_proc_detach_bus(struct pci_bus* bus) |
| { |
| struct proc_dir_entry *de = bus->procdir; |
| if (de) |
| remove_proc_entry(de->name, proc_bus_pci_dir); |
| return 0; |
| } |
| |
| static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &proc_bus_pci_devices_op); |
| } |
| static const struct file_operations proc_bus_pci_dev_operations = { |
| .owner = THIS_MODULE, |
| .open = proc_bus_pci_dev_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| |
| static int __init pci_proc_init(void) |
| { |
| struct pci_dev *dev = NULL; |
| proc_bus_pci_dir = proc_mkdir("bus/pci", NULL); |
| proc_create("devices", 0, proc_bus_pci_dir, |
| &proc_bus_pci_dev_operations); |
| proc_initialized = 1; |
| while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
| pci_proc_attach_device(dev); |
| } |
| return 0; |
| } |
| |
| device_initcall(pci_proc_init); |
| |