[PATCH NEXT 4/6] PCI/AER: Clear device status error bits during ERR_FATAL and ERR_NONFATAL

Oza Pawandeep
2018-06-07T06:00:57Z

We are handling ERR_FATAL by resetting the Link in software,skipping the
driver pci_error_handlers callbacks, removing the devices from the PCI
subsystem, and re-enumerating, the device status has to be cleared,
which fixes BUG existed before.

Signed-off-by: Oza Pawandeep <poza@codeaurora.org>

diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c
index 8cbc62b..0d9eaba 100644
--- a/drivers/pci/pcie/aer/aerdrv.c
+++ b/drivers/pci/pcie/aer/aerdrv.c
@@ -341,12 +341,8 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
*/
static void aer_error_resume(struct pci_dev *dev)
{
- u16 reg16;
-
/* Clean up Root device status */
- pcie_capability_read_word(dev, PCI_EXP_DEVSTA, &reg16);
- pcie_capability_write_word(dev, PCI_EXP_DEVSTA, reg16);
-
+ pci_cleanup_aer_error_device_status(dev);
/* Clean AER Root Error Status */
pci_cleanup_aer_uncorrect_error_status(dev);
}
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index 6745e37..95e9828 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -47,6 +47,17 @@ int pci_disable_pcie_error_reporting(struct pci_dev *dev)
}
EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);

+int pci_cleanup_aer_error_device_status(struct pci_dev *dev)
+{
+ u16 reg16;
+
+ /* Clean up Root device status */
+ pcie_capability_read_word(dev, PCI_EXP_DEVSTA, &reg16);
+ pcie_capability_write_word(dev, PCI_EXP_DEVSTA, reg16);
+
+ return 0;
+}
+
int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
{
int pos;
diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index 3998ed7..e1e642c 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -252,6 +252,7 @@ static pci_ers_result_t broadcast_error_message(struct pci_dev *dev,
dev->error_state = state;
pci_walk_bus(dev->subordinate, cb, &result_data);
if (cb == report_resume) {
+ pci_cleanup_aer_error_device_status(dev);
pci_cleanup_aer_uncorrect_error_status(dev);
dev->error_state = pci_channel_io_normal;
}
@@ -312,6 +313,7 @@ void pcie_do_fatal_recovery(struct pci_dev *dev, u32 service)
* do error recovery on all subordinates of the bridge instead
* of the bridge and clear the error status of the bridge.
*/
+ pci_cleanup_aer_error_device_status(dev);
pci_cleanup_aer_uncorrect_error_status(dev);
}

diff --git a/include/linux/aer.h b/include/linux/aer.h
index 514bffa..165a147 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -44,6 +44,7 @@ struct aer_capability_regs {
/* PCIe port driver needs this function to enable AER */
int pci_enable_pcie_error_reporting(struct pci_dev *dev);
int pci_disable_pcie_error_reporting(struct pci_dev *dev);
+int pci_cleanup_aer_error_device_status(struct pci_dev *dev);
int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev);
int pci_cleanup_aer_error_status_regs(struct pci_dev *dev);
#else
@@ -55,6 +56,10 @@ static inline int pci_disable_pcie_error_reporting(struct pci_dev *dev)
{
return -EINVAL;
}
+static inline int pci_cleanup_aer_error_device_status(struct pci_dev *dev)
+{
+ return -EINVAL;
+}
static inline int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
{
return -EINVAL;
--
2.7.4