From a6bd101b8f84f9b98768e9ab1e418c239e2e669f Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Thu, 20 Sep 2018 10:27:16 -0600 Subject: PCI: Unify device inaccessible Bring surprise removals and permanent failures together so we no longer need separate flags. The implementation enforces that error handling will not be able to override a surprise removal's permanent channel failure. Signed-off-by: Keith Busch Signed-off-by: Bjorn Helgaas Reviewed-by: Sinan Kaya --- drivers/pci/pci.h | 60 +++++++++++++++++++++++++++++++++++++++++++++----- drivers/pci/pcie/err.c | 10 ++++----- 2 files changed, 59 insertions(+), 11 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 9b279805489f..eb3125decffe 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -295,21 +295,71 @@ struct pci_sriov { bool drivers_autoprobe; /* Auto probing of VFs by driver */ }; -/* pci_dev priv_flags */ -#define PCI_DEV_DISCONNECTED 0 -#define PCI_DEV_ADDED 1 +/** + * pci_dev_set_io_state - Set the new error state if possible. + * + * @dev - pci device to set new error_state + * @new - the state we want dev to be in + * + * Must be called with device_lock held. + * + * Returns true if state has been changed to the requested state. + */ +static inline bool pci_dev_set_io_state(struct pci_dev *dev, + pci_channel_state_t new) +{ + bool changed = false; + + device_lock_assert(&dev->dev); + switch (new) { + case pci_channel_io_perm_failure: + switch (dev->error_state) { + case pci_channel_io_frozen: + case pci_channel_io_normal: + case pci_channel_io_perm_failure: + changed = true; + break; + } + break; + case pci_channel_io_frozen: + switch (dev->error_state) { + case pci_channel_io_frozen: + case pci_channel_io_normal: + changed = true; + break; + } + break; + case pci_channel_io_normal: + switch (dev->error_state) { + case pci_channel_io_frozen: + case pci_channel_io_normal: + changed = true; + break; + } + break; + } + if (changed) + dev->error_state = new; + return changed; +} static inline int pci_dev_set_disconnected(struct pci_dev *dev, void *unused) { - set_bit(PCI_DEV_DISCONNECTED, &dev->priv_flags); + device_lock(&dev->dev); + pci_dev_set_io_state(dev, pci_channel_io_perm_failure); + device_unlock(&dev->dev); + return 0; } static inline bool pci_dev_is_disconnected(const struct pci_dev *dev) { - return test_bit(PCI_DEV_DISCONNECTED, &dev->priv_flags); + return dev->error_state == pci_channel_io_perm_failure; } +/* pci_dev priv_flags */ +#define PCI_DEV_ADDED 0 + static inline void pci_dev_assign_added(struct pci_dev *dev, bool added) { assign_bit(PCI_DEV_ADDED, &dev->priv_flags, added); diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c index 31e8a4314384..4da2a62b4f77 100644 --- a/drivers/pci/pcie/err.c +++ b/drivers/pci/pcie/err.c @@ -52,9 +52,8 @@ static int report_error_detected(struct pci_dev *dev, const struct pci_error_handlers *err_handler; device_lock(&dev->dev); - dev->error_state = state; - - if (!dev->driver || + if (!pci_dev_set_io_state(dev, state) || + !dev->driver || !dev->driver->err_handler || !dev->driver->err_handler->error_detected) { /* @@ -130,9 +129,8 @@ static int report_resume(struct pci_dev *dev, void *data) const struct pci_error_handlers *err_handler; device_lock(&dev->dev); - dev->error_state = pci_channel_io_normal; - - if (!dev->driver || + if (!pci_dev_set_io_state(dev, pci_channel_io_normal) || + !dev->driver || !dev->driver->err_handler || !dev->driver->err_handler->resume) goto out; -- cgit v1.2.3-59-g8ed1b