[PATCH AUTOSEL 6.19-6.18] drm/amdgpu: avoid sdma ring reset in sriov

[Sasha Levin]

From: Victor Zhao <Victor.Zhao@xxxxxxx>

[ Upstream commit 5cc7bbd9f1b74d9fe2f7ac08d6ba0477e8d2d65f ]

sdma ring reset is not supported in SRIOV. kfd driver does not check
reset mask, and could queue sdma ring reset during unmap_queues_cpsch.

Avoid the ring reset for sriov.

Signed-off-by: Victor Zhao <Victor.Zhao@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---

LLM Generated explanations, may be completely bogus:

The background task completed but my analysis is already finished. The
result would show the same finding I already verified — that
`amdgpu_sdma_reset_engine` was introduced in the v6.15 cycle.

My final answer remains **YES** — this is a small, correct bug fix for
SR-IOV environments that prevents SDMA scheduler work queues from being
left in a stopped state.

 drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
index 8b8a04138711c..321310ba2c08e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
@@ -558,6 +558,9 @@ int amdgpu_sdma_reset_engine(struct amdgpu_device *adev, uint32_t instance_id,
 	struct amdgpu_ring *gfx_ring = &sdma_instance->ring;
 	struct amdgpu_ring *page_ring = &sdma_instance->page;
 
+	if (amdgpu_sriov_vf(adev))
+		return -EOPNOTSUPP;
+
 	mutex_lock(&sdma_instance->engine_reset_mutex);
 
 	if (!caller_handles_kernel_queues) {
-- 
2.51.0