diff options
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 9909352f414ec..423f2fd405afc 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 |