Bug 209141 - DPC/AER kernel message is misleading in FW first mode
Summary: DPC/AER kernel message is misleading in FW first mode
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: PCI (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: drivers_pci@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-09-03 06:05 UTC by David Chang
Modified: 2021-01-03 13:21 UTC (History)
3 users (show)

See Also:
Kernel Version: 5.8.0-rc1
Subsystem:
Regression: No
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Description David Chang 2020-09-03 06:05:41 UTC 
There are issues in how the OS advertises control of DPC and AER. 

In firmware controlled DPC mode, the kernel log shows:

[    0.199999] acpi PNP0A08:01: _OSC: platform does not support [SHPCHotplug AER LTR]
[    0.200118] acpi PNP0A08:01: _OSC: OS now controls [PCIeHotplug PME PCIeCapability DPC]

There are two problems with the above. 
1) In line one, the OS log states the platform does not support AER. However, the platform does support AER. This kernel log statement is incorrect.

2) In line two, the OS log states the OS now controls DPC. This is not correct as the firmware owns/controls both DPC and AER.
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