diff options
| author | Patrick Rudolph <patrick.rudolph@9elements.com> | 2023-04-05 09:49:11 +0200 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2023-04-11 16:28:03 +0000 |
| commit | d708884d506cfd5a5c99de5bfc1ce48aa8abedbb (patch) | |
| tree | 08b935a4342d34fc94ee69c8bad84a90bfa29ec5 /src/soc/intel/xeon_sp/acpi | |
| parent | daf834a705e167efc56e72dfb244d161a9605a9d (diff) | |
soc/intel/xeon_sp/acpi: Fix _OSC method
Fix a couple of bugs in the _OSC method for handling
"PCI Host Bridge Device" on Xeon-SP.
- Drop the Sleep. The code doesn't write to hardware at all, so
there's no need to sleep here.
- Make sure that the number of DWORD passed in Arg2 is at least 3.
The existing check was useless as it would not create the
DWordField, but then use it anyways.
- Add check for CXL 2 device method calls which provide a 5 DWORD
long buffer to prevent buffer overflows when invoking the
"PCI Host Bridge Device" method.
Test:
Boot on Archer City and confirm that no ACPI errors are reported
for _OSC.
Change-Id: Ide598e386c30ced24e4f96c37f2b4a609ac33441
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74231
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jon.zhixiong.zhang@gmail.com>
Diffstat (limited to 'src/soc/intel/xeon_sp/acpi')
| -rw-r--r-- | src/soc/intel/xeon_sp/acpi/iiostack.asl | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/src/soc/intel/xeon_sp/acpi/iiostack.asl b/src/soc/intel/xeon_sp/acpi/iiostack.asl index 91a5c6cd4d..e5e6bdc267 100644 --- a/src/soc/intel/xeon_sp/acpi/iiostack.asl +++ b/src/soc/intel/xeon_sp/acpi/iiostack.asl @@ -27,17 +27,18 @@ CreateDWordField (Arg3, 0x00, CDW1) \ If ((Arg0 == ToUUID ("33db4d5b-1ff7-401c-9657-7441c03dd766") /* PCI Host Bridge Device */)) \ { \ - CreateDWordField (Arg3, 0x04, CDW2) \ - If ((Arg2 > 0x02)) \ + If (Arg2 < 0x03) \ { \ - CreateDWordField (Arg3, 0x08, CDW3) \ + CDW1 |= 0x02 /* Unknown failure */ \ + Return (Arg3) \ } \ + CreateDWordField (Arg3, 0x04, CDW2) \ + CreateDWordField (Arg3, 0x08, CDW3) \ SUPP = CDW2 \ CTRL = CDW3 \ If ((AHPE || ((SUPP & 0x16) != 0x16))) \ { \ CTRL &= 0x1E \ - Sleep (0x03E8) \ } \ /* Never allow SHPC (no SHPC controller in system) */ \ CTRL &= 0x1D \ |