diff options
| author | Shashank Sharma <shashank.sharma@amd.com> | 2023-04-12 15:39:00 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2023-08-08 00:14:07 +0300 |
| commit | d124aa0ac96358042ba34df091a3bfa6e77fcf6f (patch) | |
| tree | a76c3e538fb9e996c91e6308251ffd2ac04eda61 /drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c | |
| parent | 3b885ab27f361b790b9e8450384a2ba1ef523724 (diff) | |
| download | linux-d124aa0ac96358042ba34df091a3bfa6e77fcf6f.tar.xz | |
drm/amdgpu: get absolute offset from doorbell index
This patch adds a helper function which converts a doorbell's
relative index in a BO to an absolute doorbell offset in the
doorbell BAR.
V2: No space between the variable name doc (Luben)
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian Koenig <christian.koenig@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c index 9909352f414e..423f2fd405af 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c @@ -109,6 +109,27 @@ void amdgpu_mm_wdoorbell64(struct amdgpu_device *adev, u32 index, u64 v) } /** + * amdgpu_doorbell_index_on_bar - Find doorbell's absolute offset in BAR + * + * @adev: amdgpu_device pointer + * @db_bo: doorbell object's bo + * @db_index: doorbell relative index in this doorbell object + * + * returns doorbell's absolute index in BAR + */ +uint32_t amdgpu_doorbell_index_on_bar(struct amdgpu_device *adev, + struct amdgpu_bo *db_bo, + uint32_t doorbell_index) +{ + int db_bo_offset; + + db_bo_offset = amdgpu_bo_gpu_offset_no_check(db_bo); + + /* doorbell index is 32 bit but doorbell's size is 64-bit, so *2 */ + return db_bo_offset / sizeof(u32) + doorbell_index * 2; +} + +/** * amdgpu_doorbell_create_kernel_doorbells - Create kernel doorbells for graphics * * @adev: amdgpu_device pointer |