Commit d124aa0a authored by Shashank Sharma's avatar Shashank Sharma Committed by Alex Deucher
Browse files

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: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarShashank Sharma <shashank.sharma@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 3b885ab2

drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h

+3 −0
Original line number Diff line number Diff line
@@ -356,6 +356,9 @@ 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))

drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c

+21 −0
Original line number Diff line number Diff line
@@ -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

 *