diff options
| author | Kai-Heng Feng <[email protected]> | 2021-12-03 11:15:41 +0800 |
|---|---|---|
| committer | Lorenzo Pieralisi <[email protected]> | 2022-01-04 15:25:27 +0000 |
| commit | 04b12ef163d10e348db664900ae7f611b83c7a0e (patch) | |
| tree | 3a2eca6ac8a7fbf58293e5e9f9767e4a3ed16689 /net/lapb/lapb_subr.c | |
| parent | 6aab5622296b990024ee67dd7efa7d143e7558d0 (diff) | |
PCI: vmd: Honor ACPI _OSC on PCIe features
When Samsung PCIe Gen4 NVMe is connected to Intel ADL VMD, the
combination causes AER message flood and drags the system performance
down.
The issue doesn't happen when VMD mode is disabled in BIOS, since AER
isn't enabled by acpi_pci_root_create() . When VMD mode is enabled, AER
is enabled regardless of _OSC:
[ 0.410076] acpi PNP0A08:00: _OSC: platform does not support [AER]
...
[ 1.486704] pcieport 10000:e0:06.0: AER: enabled with IRQ 146
Since VMD is an aperture to regular PCIe root ports, honor ACPI _OSC to
disable PCIe features accordingly to resolve the issue.
Suggested-by: Rafael J. Wysocki <[email protected]>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215027
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kai-Heng Feng <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Reviewed-by: Rafael J. Wysocki <[email protected]>
Diffstat (limited to 'net/lapb/lapb_subr.c')
0 files changed, 0 insertions, 0 deletions