diff options
| author | Bjorn Helgaas <bhelgaas@google.com> | 2016-10-03 09:42:57 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-10-03 09:42:57 -0500 |
| commit | 4dc2db096a9f7c0316bafc18ee00d89e0acf4ebf (patch) | |
| tree | 99563a111f0f5c0b2d8e90acfe840c7db1d0c603 /Documentation/PCI/pcieaer-howto.txt | |
| parent | 9e18ad98ca71ca0cfcadf633547409829773f36a (diff) | |
| parent | 6b20f728549030056402d7f68ea670eea1eb8198 (diff) | |
Merge branch 'pci/aer' into next
* pci/aer:
PCI/AER: Fix aer_probe() kernel-doc comment
PCI/AER: Cache capability position
PCI/AER: Avoid memory allocation in interrupt handling path
ACPI / APEI: Send correct severity to calculate AER severity
PCI/AER: Remove duplicate AER severity translation
PCI/AER: Remove aerdriver.forceload kernel parameter
PCI/AER: Remove aerdriver.nosourceid kernel parameter
x86/PCI: VMD: Add quirk for AER to ignore source ID
PCI/AER: Add bus flag to skip source ID matching
Conflicts:
drivers/pci/probe.c
Diffstat (limited to 'Documentation/PCI/pcieaer-howto.txt')
| -rw-r--r-- | Documentation/PCI/pcieaer-howto.txt | 26 |
1 files changed, 9 insertions, 17 deletions
diff --git a/Documentation/PCI/pcieaer-howto.txt b/Documentation/PCI/pcieaer-howto.txt index b4987c0bcb20..ea8cafba255c 100644 --- a/Documentation/PCI/pcieaer-howto.txt +++ b/Documentation/PCI/pcieaer-howto.txt @@ -49,25 +49,17 @@ depends on CONFIG_PCIEPORTBUS, so pls. set CONFIG_PCIEPORTBUS=y and CONFIG_PCIEAER = y. 2.2 Load PCI Express AER Root Driver -There is a case where a system has AER support in BIOS. Enabling the AER -Root driver and having AER support in BIOS may result unpredictable -behavior. To avoid this conflict, a successful load of the AER Root driver -requires ACPI _OSC support in the BIOS to allow the AER Root driver to -request for native control of AER. See the PCI FW 3.0 Specification for -details regarding OSC usage. Currently, lots of firmwares don't provide -_OSC support while they use PCI Express. To support such firmwares, -forceload, a parameter of type bool, could enable AER to continue to -be initiated although firmwares have no _OSC support. To enable the -walkaround, pls. add aerdriver.forceload=y to kernel boot parameter line -when booting kernel. Note that forceload=n by default. - -nosourceid, another parameter of type bool, can be used when broken -hardware (mostly chipsets) has root ports that cannot obtain the reporting -source ID. nosourceid=n by default. + +Some systems have AER support in firmware. Enabling Linux AER support at +the same time the firmware handles AER may result in unpredictable +behavior. Therefore, Linux does not handle AER events unless the firmware +grants AER control to the OS via the ACPI _OSC method. See the PCI FW 3.0 +Specification for details regarding _OSC usage. 2.3 AER error output -When a PCI-E AER error is captured, an error message will be outputted to -console. If it's a correctable error, it is outputted as a warning. + +When a PCIe AER error is captured, an error message will be output to +console. If it's a correctable error, it is output as a warning. Otherwise, it is printed as an error. So users could choose different log level to filter out correctable error messages. |