From: Bjorn Helgaas <bhelg...@google.com>
During recovery from fatal errors, we previously called
pci_cleanup_aer_uncorrect_error_status(), which cleared *all* uncorrectable
error status bits (both ERR_FATAL and ERR_NONFATAL).
Instead, call a new pci_aer_clear_fatal_status() that clears only the
ERR_FATAL bits (as indicated by the PCI_ERR_UNCOR_SEVER register).
Based-on-patch-by: Oza Pawandeep <p...@codeaurora.org>
Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
---
drivers/pci/pci.h | 4 ++++
drivers/pci/pcie/aer.c | 17 +++++++++++++++++
drivers/pci/pcie/err.c | 2 +-
3 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index c358e7a07f3f..12fd2ac95843 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -452,4 +452,8 @@ static inline int
devm_of_pci_get_host_bridge_resources(struct device *dev,
}
#endif
+#ifdef CONFIG_PCIEAER
+void pci_aer_clear_fatal_status(struct pci_dev *dev);
+#endif
+
#endif /* DRIVERS_PCI_H */
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index a2e88386af28..5b4a84e3d360 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -374,6 +374,23 @@ int pci_cleanup_aer_uncorrect_error_status(struct pci_dev
*dev)
}
EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
+void pci_aer_clear_fatal_status(struct pci_dev *dev)
+{
+ int pos;
+ u32 status, sev;
+
+ pos = dev->aer_cap;
+ if (!pos)
+ return;
+
+ /* Clear status bits for ERR_FATAL errors only */
+ pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
+ pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &sev);
+ status &= sev;
+ if (status)
+ pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
+}
+
int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
{
int pos;
diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index f7ce0cb0b0b7..0539518f9861 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -316,7 +316,7 @@ 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_uncorrect_error_status(dev);
+ pci_aer_clear_fatal_status(dev);
}
if (result == PCI_ERS_RESULT_RECOVERED) {
