Am 12.04.23 um 18:25 schrieb Shashank Sharma:
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@xxxxxxx>
Cc: Christian Koenig <christian.koenig@xxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxx>
Acked-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h | 3 +++
.../gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c | 21 +++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h
index fbbff12a14cd..b110e002bad2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h
@@ -317,6 +317,9 @@ void amdgpu_mm_wdoorbell64(struct amdgpu_device *adev, u32 index, u64 v);
int amdgpu_doorbell_init(struct amdgpu_device *adev);
void amdgpu_doorbell_fini(struct amdgpu_device *adev);
int amdgpu_doorbell_create_kernel_doorbells(struct amdgpu_device *adev);
+uint32_t amdgpu_doorbell_index_on_bar(struct amdgpu_device *adev,
+ struct amdgpu_bo *db_bo,
+ uint32_t doorbell_index);
#define RDOORBELL32(index) amdgpu_mm_rdoorbell(adev, (index))
#define WDOORBELL32(index, v) amdgpu_mm_wdoorbell(adev, (index), (v))
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
index 8be2dfa8fa74..a99cd56e8bf4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
@@ -108,6 +108,27 @@ void amdgpu_mm_wdoorbell64(struct amdgpu_device *adev, u32 index, u64 v)
DRM_ERROR("writing beyond doorbell aperture: 0x%08x!\n", index);
}
+/**
+ * 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
*
