drm/amdgpu: rework ring reset backup and reemit v9

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Store the start wptr and ib size in the IB fence. On queue
reset, save the ring contents of all IBs.

For reemit, reemit the entire IB state for non-guilty contexts.
For guilty contexts, replace the IB submission with nops, but reemit
the rest.  Split the reemit per fence and when we reemit, update the
wptr with the new values from reemit.  This allows us to reemit jobs
repeatedly as the wptrs get properly updated each time.

v2: further simplify the logic
v3: reemit vm state, not just vm fence
v4: just nop the IB and possibly the VM portion of the submission
v5: simplify the vm fence check
v6: split the vm and ib fences
v7: fix commit message
v8: use wptr rather than count_dw to calculate offsets
v9: fix missing documenation update spotted by the kernel test robot

Reviewed-by: Jesse Zhang <jesse.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Alex Deucher 2026-01-15 22:01:15 -05:00

parent b43effe188

commit a17ef94121

4 changed files with 74 additions and 117 deletions

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99

drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c

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26

drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c

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46

drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c

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20

drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h

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