drm/amdgpu: use doorbell mgr for MES kernel doorbells

This patch:
- Removes the existing doorbell management code, and its variables
  from the doorbell_init function, it will be done in doorbell
  manager now.
- uses the doorbell page created for MES kernel level needs (doorbells
  for MES self tests)
- current MES code was allocating MES doorbells in MES process context,
  but those were getting written using kernel doorbell calls. This patch
  instead allocates a MES kernel doorbell for this (in add_hw_queue).

V2: Create an extra page of doorbells for MES during kernel doorbell
    creation (Alex)
V4: Move MES doorbell size and page offset objects in this patch from
    patch 6.

Cc: Alex Deucher <[email protected]>
Cc: Christian Koenig <[email protected]>
Reviewed-by: Christian Koenig <[email protected]>
Signed-off-by: Shashank Sharma <[email protected]>
Signed-off-by: Arvind Yadav <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 4 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 423f2fd405af..da4be0bbb446 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
@@ -145,6 +145,10 @@ int amdgpu_doorbell_create_kernel_doorbells(struct amdgpu_device *adev)
 	/* Reserve first num_kernel_doorbells (page-aligned) for kernel ops */
 	size = ALIGN(adev->doorbell.num_kernel_doorbells * sizeof(u32), PAGE_SIZE);
 
+	/* Allocate an extra page for MES kernel usages (ring test) */
+	adev->mes.db_start_dw_offset = size / sizeof(u32);
+	size += PAGE_SIZE;
+
 	r = amdgpu_bo_create_kernel(adev,
 				    size,
 				    PAGE_SIZE,