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drivers/pci/access.c
11.2 KB
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#include <linux/delay.h> |
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#include <linux/pci.h> #include <linux/module.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/ioport.h> |
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#include <linux/wait.h> |
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#include "pci.h" |
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/* * This interrupt-safe spinlock protects all accesses to PCI * configuration space. */ |
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DEFINE_RAW_SPINLOCK(pci_lock); |
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/* * Wrappers for all PCI configuration access functions. They just check * alignment, do locking and call the low-level functions pointed to * by pci_dev->ops. */ #define PCI_byte_BAD 0 #define PCI_word_BAD (pos & 1) #define PCI_dword_BAD (pos & 3) #define PCI_OP_READ(size,type,len) \ int pci_bus_read_config_##size \ (struct pci_bus *bus, unsigned int devfn, int pos, type *value) \ { \ int res; \ unsigned long flags; \ u32 data = 0; \ if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ |
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raw_spin_lock_irqsave(&pci_lock, flags); \ |
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res = bus->ops->read(bus, devfn, pos, len, &data); \ *value = (type)data; \ |
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raw_spin_unlock_irqrestore(&pci_lock, flags); \ |
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return res; \ } #define PCI_OP_WRITE(size,type,len) \ int pci_bus_write_config_##size \ (struct pci_bus *bus, unsigned int devfn, int pos, type value) \ { \ int res; \ unsigned long flags; \ if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ |
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raw_spin_lock_irqsave(&pci_lock, flags); \ |
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res = bus->ops->write(bus, devfn, pos, len, value); \ |
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raw_spin_unlock_irqrestore(&pci_lock, flags); \ |
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return res; \ } PCI_OP_READ(byte, u8, 1) PCI_OP_READ(word, u16, 2) PCI_OP_READ(dword, u32, 4) PCI_OP_WRITE(byte, u8, 1) PCI_OP_WRITE(word, u16, 2) PCI_OP_WRITE(dword, u32, 4) EXPORT_SYMBOL(pci_bus_read_config_byte); EXPORT_SYMBOL(pci_bus_read_config_word); EXPORT_SYMBOL(pci_bus_read_config_dword); EXPORT_SYMBOL(pci_bus_write_config_byte); EXPORT_SYMBOL(pci_bus_write_config_word); EXPORT_SYMBOL(pci_bus_write_config_dword); |
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/** * pci_bus_set_ops - Set raw operations of pci bus * @bus: pci bus struct * @ops: new raw operations * * Return previous raw operations */ struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops) { struct pci_ops *old_ops; unsigned long flags; |
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raw_spin_lock_irqsave(&pci_lock, flags); |
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old_ops = bus->ops; bus->ops = ops; |
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raw_spin_unlock_irqrestore(&pci_lock, flags); |
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return old_ops; } EXPORT_SYMBOL(pci_bus_set_ops); |
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/** * pci_read_vpd - Read one entry from Vital Product Data * @dev: pci device struct * @pos: offset in vpd space * @count: number of bytes to read * @buf: pointer to where to store result * */ ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf) { if (!dev->vpd || !dev->vpd->ops) return -ENODEV; return dev->vpd->ops->read(dev, pos, count, buf); } EXPORT_SYMBOL(pci_read_vpd); /** * pci_write_vpd - Write entry to Vital Product Data * @dev: pci device struct * @pos: offset in vpd space |
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* @count: number of bytes to write * @buf: buffer containing write data |
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* */ ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf) { if (!dev->vpd || !dev->vpd->ops) return -ENODEV; return dev->vpd->ops->write(dev, pos, count, buf); } EXPORT_SYMBOL(pci_write_vpd); |
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/* * The following routines are to prevent the user from accessing PCI config * space when it's unsafe to do so. Some devices require this during BIST and * we're required to prevent it during D-state transitions. * * We have a bit per device to indicate it's blocked and a global wait queue * for callers to sleep on until devices are unblocked. */ |
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static DECLARE_WAIT_QUEUE_HEAD(pci_cfg_wait); |
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|
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static noinline void pci_wait_cfg(struct pci_dev *dev) |
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{ DECLARE_WAITQUEUE(wait, current); |
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__add_wait_queue(&pci_cfg_wait, &wait); |
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do { set_current_state(TASK_UNINTERRUPTIBLE); |
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raw_spin_unlock_irq(&pci_lock); |
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schedule(); |
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raw_spin_lock_irq(&pci_lock); |
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} while (dev->block_cfg_access); __remove_wait_queue(&pci_cfg_wait, &wait); |
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} |
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/* Returns 0 on success, negative values indicate error. */ |
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#define PCI_USER_READ_CONFIG(size,type) \ int pci_user_read_config_##size \ (struct pci_dev *dev, int pos, type *val) \ { \ |
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int ret = 0; \ u32 data = -1; \ |
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if (PCI_##size##_BAD) \ return -EINVAL; \ |
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raw_spin_lock_irq(&pci_lock); \ |
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if (unlikely(dev->block_cfg_access)) \ pci_wait_cfg(dev); \ |
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ret = dev->bus->ops->read(dev->bus, dev->devfn, \ |
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pos, sizeof(type), &data); \ |
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raw_spin_unlock_irq(&pci_lock); \ |
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*val = (type)data; \ |
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if (ret > 0) \ ret = -EINVAL; \ |
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return ret; \ } |
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/* Returns 0 on success, negative values indicate error. */ |
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#define PCI_USER_WRITE_CONFIG(size,type) \ int pci_user_write_config_##size \ (struct pci_dev *dev, int pos, type val) \ { \ |
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int ret = -EIO; \ |
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if (PCI_##size##_BAD) \ return -EINVAL; \ |
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raw_spin_lock_irq(&pci_lock); \ |
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if (unlikely(dev->block_cfg_access)) \ pci_wait_cfg(dev); \ |
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ret = dev->bus->ops->write(dev->bus, dev->devfn, \ |
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pos, sizeof(type), val); \ |
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raw_spin_unlock_irq(&pci_lock); \ |
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if (ret > 0) \ ret = -EINVAL; \ |
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return ret; \ } PCI_USER_READ_CONFIG(byte, u8) PCI_USER_READ_CONFIG(word, u16) PCI_USER_READ_CONFIG(dword, u32) PCI_USER_WRITE_CONFIG(byte, u8) PCI_USER_WRITE_CONFIG(word, u16) PCI_USER_WRITE_CONFIG(dword, u32) |
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/* VPD access through PCI 2.2+ VPD capability */ #define PCI_VPD_PCI22_SIZE (PCI_VPD_ADDR_MASK + 1) struct pci_vpd_pci22 { struct pci_vpd base; |
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struct mutex lock; u16 flag; |
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bool busy; |
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u8 cap; |
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}; |
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/* * Wait for last operation to complete. * This code has to spin since there is no other notification from the PCI * hardware. Since the VPD is often implemented by serial attachment to an * EEPROM, it may take many milliseconds to complete. |
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* * Returns 0 on success, negative values indicate error. |
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*/ |
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static int pci_vpd_pci22_wait(struct pci_dev *dev) { struct pci_vpd_pci22 *vpd = container_of(dev->vpd, struct pci_vpd_pci22, base); |
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unsigned long timeout = jiffies + HZ/20 + 2; u16 status; |
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int ret; if (!vpd->busy) return 0; |
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for (;;) { |
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ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR, |
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&status); |
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if (ret < 0) |
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return ret; |
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if ((status & PCI_VPD_ADDR_F) == vpd->flag) { |
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vpd->busy = false; return 0; } |
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if (time_after(jiffies, timeout)) { dev_printk(KERN_DEBUG, &dev->dev, "vpd r/w failed. This is likely a firmware " "bug on this device. Contact the card " "vendor for a firmware update."); |
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return -ETIMEDOUT; |
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} |
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if (fatal_signal_pending(current)) return -EINTR; if (!cond_resched()) udelay(10); |
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} } |
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static ssize_t pci_vpd_pci22_read(struct pci_dev *dev, loff_t pos, size_t count, void *arg) |
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{ struct pci_vpd_pci22 *vpd = container_of(dev->vpd, struct pci_vpd_pci22, base); |
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int ret; loff_t end = pos + count; u8 *buf = arg; |
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|
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if (pos < 0 || pos > vpd->base.len || end > vpd->base.len) |
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return -EINVAL; |
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|
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if (mutex_lock_killable(&vpd->lock)) return -EINTR; |
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ret = pci_vpd_pci22_wait(dev); if (ret < 0) goto out; |
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|
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while (pos < end) { u32 val; unsigned int i, skip; ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR, pos & ~3); if (ret < 0) break; vpd->busy = true; vpd->flag = PCI_VPD_ADDR_F; ret = pci_vpd_pci22_wait(dev); if (ret < 0) break; ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val); if (ret < 0) break; skip = pos & 3; for (i = 0; i < sizeof(u32); i++) { if (i >= skip) { *buf++ = val; if (++pos == end) break; } val >>= 8; } } |
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out: |
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mutex_unlock(&vpd->lock); |
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return ret ? ret : count; |
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} |
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static ssize_t pci_vpd_pci22_write(struct pci_dev *dev, loff_t pos, size_t count, const void *arg) |
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{ struct pci_vpd_pci22 *vpd = container_of(dev->vpd, struct pci_vpd_pci22, base); |
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const u8 *buf = arg; loff_t end = pos + count; |
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int ret = 0; |
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|
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if (pos < 0 || (pos & 3) || (count & 3) || end > vpd->base.len) |
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return -EINVAL; |
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if (mutex_lock_killable(&vpd->lock)) return -EINTR; |
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|
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ret = pci_vpd_pci22_wait(dev); if (ret < 0) goto out; |
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while (pos < end) { u32 val; val = *buf++; val |= *buf++ << 8; val |= *buf++ << 16; val |= *buf++ << 24; ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA, val); if (ret < 0) break; ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR, pos | PCI_VPD_ADDR_F); if (ret < 0) break; vpd->busy = true; vpd->flag = 0; ret = pci_vpd_pci22_wait(dev); |
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if (ret < 0) break; |
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pos += sizeof(u32); } |
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out: |
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mutex_unlock(&vpd->lock); |
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return ret ? ret : count; |
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} |
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static void pci_vpd_pci22_release(struct pci_dev *dev) { kfree(container_of(dev->vpd, struct pci_vpd_pci22, base)); } |
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static const struct pci_vpd_ops pci_vpd_pci22_ops = { |
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.read = pci_vpd_pci22_read, .write = pci_vpd_pci22_write, |
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.release = pci_vpd_pci22_release, }; int pci_vpd_pci22_init(struct pci_dev *dev) { struct pci_vpd_pci22 *vpd; u8 cap; cap = pci_find_capability(dev, PCI_CAP_ID_VPD); if (!cap) return -ENODEV; vpd = kzalloc(sizeof(*vpd), GFP_ATOMIC); if (!vpd) return -ENOMEM; |
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vpd->base.len = PCI_VPD_PCI22_SIZE; |
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vpd->base.ops = &pci_vpd_pci22_ops; |
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mutex_init(&vpd->lock); |
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vpd->cap = cap; vpd->busy = false; dev->vpd = &vpd->base; return 0; } |
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/** |
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* pci_vpd_truncate - Set available Vital Product Data size * @dev: pci device struct * @size: available memory in bytes * * Adjust size of available VPD area. */ int pci_vpd_truncate(struct pci_dev *dev, size_t size) { if (!dev->vpd) return -EINVAL; /* limited by the access method */ if (size > dev->vpd->len) return -EINVAL; dev->vpd->len = size; |
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if (dev->vpd->attr) dev->vpd->attr->size = size; |
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return 0; } EXPORT_SYMBOL(pci_vpd_truncate); /** |
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* pci_cfg_access_lock - Lock PCI config reads/writes |
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* @dev: pci device struct * |
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* When access is locked, any userspace reads or writes to config * space and concurrent lock requests will sleep until access is * allowed via pci_cfg_access_unlocked again. |
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*/ |
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void pci_cfg_access_lock(struct pci_dev *dev) { might_sleep(); raw_spin_lock_irq(&pci_lock); if (dev->block_cfg_access) pci_wait_cfg(dev); dev->block_cfg_access = 1; raw_spin_unlock_irq(&pci_lock); } EXPORT_SYMBOL_GPL(pci_cfg_access_lock); /** * pci_cfg_access_trylock - try to lock PCI config reads/writes * @dev: pci device struct * * Same as pci_cfg_access_lock, but will return 0 if access is * already locked, 1 otherwise. This function can be used from * atomic contexts. */ bool pci_cfg_access_trylock(struct pci_dev *dev) |
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{ unsigned long flags; |
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bool locked = true; |
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|
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raw_spin_lock_irqsave(&pci_lock, flags); |
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if (dev->block_cfg_access) locked = false; else dev->block_cfg_access = 1; |
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raw_spin_unlock_irqrestore(&pci_lock, flags); |
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|
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return locked; |
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} |
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EXPORT_SYMBOL_GPL(pci_cfg_access_trylock); |
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/** |
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* pci_cfg_access_unlock - Unlock PCI config reads/writes |
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* @dev: pci device struct * |
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* This function allows PCI config accesses to resume. |
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*/ |
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void pci_cfg_access_unlock(struct pci_dev *dev) |
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{ unsigned long flags; |
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raw_spin_lock_irqsave(&pci_lock, flags); |
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/* This indicates a problem in the caller, but we don't need * to kill them, unlike a double-block above. */ |
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WARN_ON(!dev->block_cfg_access); |
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|
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dev->block_cfg_access = 0; wake_up_all(&pci_cfg_wait); |
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raw_spin_unlock_irqrestore(&pci_lock, flags); |
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} |
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EXPORT_SYMBOL_GPL(pci_cfg_access_unlock); |