PCI: PCIe AER: add aer_recover_queue

In addition to native PCIe AER, now APEI (ACPI Platform Error
Interface) GHES (Generic Hardware Error Source) can be used to report
PCIe AER errors too.  To add support to APEI GHES PCIe AER recovery,
aer_recover_queue is added to export the recovery function in native
PCIe AER driver.

Recoverable PCIe AER errors are reported via NMI in APEI GHES.  Then
APEI GHES uses irq_work to delay the error processing into an IRQ
handler.  But PCIe AER recovery can be very time-consuming, so
aer_recover_queue, which can be used in IRQ handler, delays the real
recovery action into the process context, that is, work queue.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/aer.h b/include/linux/aer.h
index 8414de22a779..544abdb2238c 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -51,5 +51,8 @@ static inline int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
 
 extern void cper_print_aer(const char *prefix, int cper_severity,
                            struct aer_capability_regs *aer);
+extern int cper_severity_to_aer(int cper_severity);
+extern void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
+                              int severity);
 #endif //_AER_H_