* configuration space.
*/
-static DEFINE_RAW_SPINLOCK(pci_lock);
+DEFINE_RAW_SPINLOCK(pci_lock);
/*
* Wrappers for all PCI configuration access functions. They just check
* 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.
*/
-static DECLARE_WAIT_QUEUE_HEAD(pci_ucfg_wait);
+static DECLARE_WAIT_QUEUE_HEAD(pci_cfg_wait);
-static noinline void pci_wait_ucfg(struct pci_dev *dev)
+static noinline void pci_wait_cfg(struct pci_dev *dev)
{
DECLARE_WAITQUEUE(wait, current);
- __add_wait_queue(&pci_ucfg_wait, &wait);
+ __add_wait_queue(&pci_cfg_wait, &wait);
do {
set_current_state(TASK_UNINTERRUPTIBLE);
raw_spin_unlock_irq(&pci_lock);
schedule();
raw_spin_lock_irq(&pci_lock);
- } while (dev->block_ucfg_access);
- __remove_wait_queue(&pci_ucfg_wait, &wait);
+ } while (dev->block_cfg_access);
+ __remove_wait_queue(&pci_cfg_wait, &wait);
}
/* Returns 0 on success, negative values indicate error. */
if (PCI_##size##_BAD) \
return -EINVAL; \
raw_spin_lock_irq(&pci_lock); \
- if (unlikely(dev->block_ucfg_access)) pci_wait_ucfg(dev); \
+ if (unlikely(dev->block_cfg_access)) \
+ pci_wait_cfg(dev); \
ret = dev->bus->ops->read(dev->bus, dev->devfn, \
pos, sizeof(type), &data); \
raw_spin_unlock_irq(&pci_lock); \
if (PCI_##size##_BAD) \
return -EINVAL; \
raw_spin_lock_irq(&pci_lock); \
- if (unlikely(dev->block_ucfg_access)) pci_wait_ucfg(dev); \
+ if (unlikely(dev->block_cfg_access)) \
+ pci_wait_cfg(dev); \
ret = dev->bus->ops->write(dev->bus, dev->devfn, \
pos, sizeof(type), val); \
raw_spin_unlock_irq(&pci_lock); \
EXPORT_SYMBOL(pci_vpd_truncate);
/**
- * pci_block_user_cfg_access - Block userspace PCI config reads/writes
+ * pci_cfg_access_lock - Lock PCI config reads/writes
* @dev: pci device struct
*
- * When user access is blocked, any reads or writes to config space will
- * sleep until access is unblocked again. We don't allow nesting of
- * block/unblock calls.
+ * 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.
*/
-void pci_block_user_cfg_access(struct pci_dev *dev)
+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)
{
unsigned long flags;
- int was_blocked;
+ bool locked = true;
raw_spin_lock_irqsave(&pci_lock, flags);
- was_blocked = dev->block_ucfg_access;
- dev->block_ucfg_access = 1;
+ if (dev->block_cfg_access)
+ locked = false;
+ else
+ dev->block_cfg_access = 1;
raw_spin_unlock_irqrestore(&pci_lock, flags);
- /* If we BUG() inside the pci_lock, we're guaranteed to hose
- * the machine */
- BUG_ON(was_blocked);
+ return locked;
}
-EXPORT_SYMBOL_GPL(pci_block_user_cfg_access);
+EXPORT_SYMBOL_GPL(pci_cfg_access_trylock);
/**
- * pci_unblock_user_cfg_access - Unblock userspace PCI config reads/writes
+ * pci_cfg_access_unlock - Unlock PCI config reads/writes
* @dev: pci device struct
*
- * This function allows userspace PCI config accesses to resume.
+ * This function allows PCI config accesses to resume.
*/
-void pci_unblock_user_cfg_access(struct pci_dev *dev)
+void pci_cfg_access_unlock(struct pci_dev *dev)
{
unsigned long flags;
/* This indicates a problem in the caller, but we don't need
* to kill them, unlike a double-block above. */
- WARN_ON(!dev->block_ucfg_access);
+ WARN_ON(!dev->block_cfg_access);
- dev->block_ucfg_access = 0;
- wake_up_all(&pci_ucfg_wait);
+ dev->block_cfg_access = 0;
+ wake_up_all(&pci_cfg_wait);
raw_spin_unlock_irqrestore(&pci_lock, flags);
}
-EXPORT_SYMBOL_GPL(pci_unblock_user_cfg_access);
+EXPORT_SYMBOL_GPL(pci_cfg_access_unlock);