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PCI/AER: Clear only ERR_FATAL status bits during fatal recovery 

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 <poza@codeaurora.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2018-07-19 17:55:58 -05:00
parent 7af02fcd84
commit 7ab92e89bf
3 changed files with 20 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/pci/pci.h
View File

@ -485,10 +485,12 @@ void pci_no_aer(void);
void pci_aer_init(struct pci_dev *dev);
void pci_aer_exit(struct pci_dev *dev);
extern const struct attribute_group aer_stats_attr_group;
void pci_aer_clear_fatal_status(struct pci_dev *dev);
#else
static inline void pci_no_aer(void) { }
static inline int pci_aer_init(struct pci_dev *d) { return -ENODEV; }
static inline void pci_aer_exit(struct pci_dev *d) { }
static inline void pci_aer_clear_fatal_status(struct pci_dev *dev) { }
#endif
#endif /* DRIVERS_PCI_H */

17
drivers/pci/pcie/aer.c
View File

@ -399,6 +399,23 @@ 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;

2
drivers/pci/pcie/err.c
View File

@ -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) {