git/linux-cryptodev-2.6
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git synced 2026-04-23 05:56:14 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/amdgpu: Improve Vega20 XGMI TLB flush workaround

Browse Source 
Using a heavy-weight TLB flush once is not sufficient. Concurrent
memory accesses in the same TLB cache line can re-populate TLB entries
from stale texture cache (TC) entries while the heavy-weight TLB
flush is in progress. To fix this race condition, perform another TLB
flush after the heavy-weight one, when TC is known to be clean.

Move the workaround into the low-level TLB flushing functions. This way
they apply to amdgpu as well, and KIQ-based TLB flush only needs to
synchronize once.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: shaoyun liu <shaoyun.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling
2020-01-17 20:29:13 -05:00
committed by Alex Deucher
parent 82c4ebfa35
commit b80cd524ac
2 changed files with 53 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
View File

@@ -647,13 +647,9 @@ int amdgpu_amdkfd_flush_gpu_tlb_vmid(struct kgd_dev *kgd, uint16_t vmid)
int amdgpu_amdkfd_flush_gpu_tlb_pasid(struct kgd_dev *kgd, uint16_t pasid)
{
struct amdgpu_device *adev = (struct amdgpu_device *)kgd;
uint32_t flush_type = 0;
const uint32_t flush_type = 0;
bool all_hub = false;
if (adev->gmc.xgmi.num_physical_nodes &&
adev->asic_type == CHIP_VEGA20)
flush_type = 2;
if (adev->family == AMDGPU_FAMILY_AI)
all_hub = true;