[PATCH 0/3] drm/amdgpu: three independent fixes in the CS and VM paths

[Junrui Luo via B4 Relay]

Three independent fixes; no dependency between them, they can be applied
or dropped individually.

Patch 1 rejects submissions carrying more than one AMDGPU_CHUNK_ID_FENCE
chunk.  p->uf_bo is a single-slot field, so every FENCE chunk but the last
leaks a BO reference that outlives handle close and process exit.

Patch 2 clamps the rounded-up entry count in amdgpu_vm_update_range().
Where AMDGPU_GPU_PAGES_IN_CPU_PAGE is greater than 1, a mapping whose GPU
page count is not a multiple of it can round num_entries up past what the
cursor holds and trip BUG_ON(size > cur->remaining) in amdgpu_res_next().
4K-page hosts are unaffected.

Patch 3 adds the mapping offset when computing the CPU-side pointer to an
IB in amdgpu_cs_patch_ibs().  The page tables are programmed from
mapping->offset, so for a mapping created with a non-zero offset_in_bo the
kernel inspects different bytes than the GPU executes.

Signed-off-by: Junrui Luo <moonafterrain@xxxxxxxxxxx>
---
Junrui Luo (3):
      drm/amdgpu: disallow multiple FENCE chunks in one submit
      drm/amdgpu: fix VM update overrun on non-4K page kernels
      drm/amdgpu: add the BO-va mapping offset when kmapping an IB

 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 6 +++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 5 +++--
 2 files changed, 8 insertions(+), 3 deletions(-)
---
base-commit: 075b74841bd0065a3bda3440873c747938e69b68
change-id: 20260806-amdgpu-fixes-7ce39504b98d

Best regards,
-- 
Junrui Luo <moonafterrain@xxxxxxxxxxx>