AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-23 09:09:36 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

drm/amdgpu: fix bad DMA from INTERRUPT_CNTL2

Browse Source 
The INTERRUPT_CNTL2 register expects a valid DMA address, but is
currently set with a GPU MC address.  This can cause problems on
systems that detect the resulting DMA read from an invalid address
(found on a Power8 guest).

Instead, use the DMA address of the dummy page because it will always
be safe.

Fixes: 27ae10641e ("drm/amdgpu: add interupt handler implementation for si v3")
Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Sam Bobroff 2019-11-18 10:53:54 +11:00 committed by Alex Deucher
parent a542ad9e5d
commit b992691d45
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/amd/amdgpu/si_ih.c
View File

@ -64,7 +64,8 @@ static int si_ih_irq_init(struct amdgpu_device *adev)
u32 interrupt_cntl, ih_cntl, ih_rb_cntl;
si_ih_disable_interrupts(adev);
WREG32(INTERRUPT_CNTL2, adev->irq.ih.gpu_addr >> 8);
/* set dummy read address to dummy page address */
WREG32(INTERRUPT_CNTL2, adev->dummy_page_addr >> 8);
interrupt_cntl = RREG32(INTERRUPT_CNTL);
interrupt_cntl &= ~IH_DUMMY_RD_OVERRIDE;
interrupt_cntl &= ~IH_REQ_NONSNOOP_EN;