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drm/amdgpu: rework how we handle TLB fences

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Add a new VM flag to indicate whether or not we need
a TLB fence.  Userqs (KFD or KGD) require a TLB fence.
A TLB fence is not strictly required for kernel queues,
but it shouldn't hurt.  That said, enabling this
unconditionally should be fine, but it seems to tickle
some issues in KIQ/MES.  Only enable them for KFD,
or when KGD userq queues are enabled (currently via module
parameter).

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4798
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4749
Fixes: f3854e04b7 ("drm/amdgpu: attach tlb fence to the PTs update")
Cc: Christian König <christian.koenig@amd.com>
Cc: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Prike Liang <Prike.Liang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 69c5fbd2b9)
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher
2026-03-16 11:04:46 -04:00
parent 3fc4648b53
commit e9f58ff991
2 changed files with 8 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
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@@ -441,6 +441,8 @@ struct amdgpu_vm {
struct ttm_lru_bulk_move lru_bulk_move;
/* Flag to indicate if VM is used for compute */
bool is_compute_context;
/* Flag to indicate if VM needs a TLB fence (KFD or KGD) */
bool need_tlb_fence;
/* Memory partition number, -1 means any partition */
int8_t mem_id;