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drm/amdgpu: block CE CS if not explicitely allowed by module option

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The Constant Engine found on gfx6-gfx10 HW has been a notorious source of
problems.

RADV never used it in the first place, radeonsi only used it for a few
releases around 2017 for gfx6-gfx9 before dropping support for it as
well.

While investigating another problem I just recently found that submitting
to the CE seems to be completely broken on gfx9 for quite a while.

Since nobody complained about that problem it most likely means that
nobody is using any of the affected radeonsi versions on current Linux
kernels any more.

So to potentially phase out the support for the CE and eliminate another
source of problems block submitting CE IBs unless it is enabled again
using a debug flag.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König
2025-09-22 14:18:16 +02:00
committed by Alex Deucher
parent 5d55ed19d4
commit 8f74c70be5
3 changed files with 14 additions and 1 deletions
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6
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
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@@ -364,6 +364,12 @@ static int amdgpu_cs_p2_ib(struct amdgpu_cs_parser *p,
if (p->uf_bo && ring->funcs->no_user_fence)
return -EINVAL;
if (!p->adev->debug_enable_ce_cs &&
chunk_ib->flags & AMDGPU_IB_FLAG_CE) {
dev_err_ratelimited(p->adev->dev, "CE CS is blocked, use debug=0x400 to override\n");
return -EINVAL;
}
if (chunk_ib->ip_type == AMDGPU_HW_IP_GFX &&
chunk_ib->flags & AMDGPU_IB_FLAG_PREEMPT) {
if (chunk_ib->flags & AMDGPU_IB_FLAG_CE)