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| author | Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> | 2020-03-24 01:26:06 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2020-03-28 19:19:03 +0100 |
| commit | aea47413e7ceec6024f5a2b743cb1a4b2176bf3f (patch) | |
| tree | 0512567689d5eae8e17a933578d0508214436aba /drivers/pci/pci.h | |
| parent | PCI/AER: Add pci_aer_raw_clear_status() to unconditionally clear Error Status (diff) | |
| download | linux-aea47413e7ceec6024f5a2b743cb1a4b2176bf3f.tar.xz linux-aea47413e7ceec6024f5a2b743cb1a4b2176bf3f.zip | |
PCI/DPC: Expose dpc_process_error(), dpc_reset_link() for use by EDR
If firmware controls DPC, it is generally responsible for managing the DPC
capability and events, and the OS should not access the DPC capability.
However, if firmware controls DPC and both the OS and the platform support
Error Disconnect Recover (EDR) notifications, the OS EDR notify handler is
responsible for recovery, and the notify handler may read/write the DPC
capability until it clears the DPC Trigger Status bit. See [1], sec 4.5.1,
table 4-6.
Expose some DPC error handling functions so they can be used by the EDR
notify handler.
[1] Downstream Port Containment Related Enhancements ECN, Jan 28, 2019,
affecting PCI Firmware Specification, Rev. 3.2
https://members.pcisig.com/wg/PCI-SIG/document/12888
Link: https://lore.kernel.org/r/e9000bb15b3a4293e81d98bb29ead7c84a6393c9.1585000084.git.sathyanarayanan.kuppuswamy@linux.intel.com
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/pci.h')
| -rw-r--r-- | drivers/pci/pci.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 6d09bb22b73d..25265bf80a83 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -449,6 +449,8 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info); void pci_save_dpc_state(struct pci_dev *dev); void pci_restore_dpc_state(struct pci_dev *dev); void pci_dpc_init(struct pci_dev *pdev); +void dpc_process_error(struct pci_dev *pdev); +pci_ers_result_t dpc_reset_link(struct pci_dev *pdev); #else static inline void pci_save_dpc_state(struct pci_dev *dev) {} static inline void pci_restore_dpc_state(struct pci_dev *dev) {} |