drm/amdkfd: fix NULL deref in SDMA HQD debugfs dump on GC 12.1

Reading the KFD HQD debugfs node (dqm_debugfs_hqds) on a gc_12_1_0 part
oopses with a NULL pointer dereference:

  BUG: kernel NULL pointer dereference, address: 0000000000000000
  RIP: hqd_sdma_dump_v12_1+0x6a [amdgpu]
  Call Trace:
   dqm_debugfs_hqds+0x2da/0x360 [amdgpu]
   kfd_debugfs_hqds_by_device+0x74/0xa0 [amdgpu]
   seq_read ... __x64_sys_read

get_sdma_rlc_reg_offset() assumes an interleaved layout where the second
SDMA per XCC lives in a separate SDMA1_HWIP register aperture. On
gc_12_1_0 that aperture does not exist.

Rewrite get_sdma_rlc_reg_offset() to mirror sdma_v7_1_get_reg_offset():
base the offset on adev->reg_offset[GC_HWIP][xcc_id][0] and add the
per-instance SDMA1 offset for the odd instance.

Fixes: 7bd5d763b8e1 ("drm/amdkfd: Add gfx_v12_1_kfd2kgd interface for GFX12_1")
Signed-off-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Reviewed-by: Mukul Joshi <mukul.joshi@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 94b2c5b06d37adc0e9a23138252758657b64b58a)
Cc: stable@vger.kernel.org

0 files changed, 0 insertions, 0 deletions