[PATCH v11 04/28] drm/amdgpu: add helpers to create userqueue object

[Shashank Sharma <shashank.sharma@amd.com>]

This patch introduces amdgpu_userqueue_object and its helper
functions to creates and destroy this object. The helper
functions creates/destroys a base amdgpu_bo, kmap/unmap it and
save the respective GPU and CPU addresses in the encapsulating
userqueue object.

These helpers will be used to create/destroy userqueue MQD, WPTR
and FW areas.

V7:
- Forked out this new patch from V11-gfx-userqueue patch to prevent
  that patch from growing very big.
- Using amdgpu_bo_create instead of amdgpu_bo_create_kernel in prep
  for eviction fences (Christian)

V9:
 - Rebase
V10:
 - Added Alex's R-B

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian Koenig <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c | 62 +++++++++++++++++++
 .../gpu/drm/amd/include/amdgpu_userqueue.h    | 13 ++++
 2 files changed, 75 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
index cf7fe68d9277..501324dde343 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
@@ -32,6 +32,68 @@ amdgpu_userqueue_find(struct amdgpu_userq_mgr *uq_mgr, int qid)
 	return idr_find(&uq_mgr->userq_idr, qid);
 }
 
+int amdgpu_userqueue_create_object(struct amdgpu_userq_mgr *uq_mgr,
+				   struct amdgpu_userq_obj *userq_obj,
+				   int size)
+{
+	struct amdgpu_device *adev = uq_mgr->adev;
+	struct amdgpu_bo_param bp;
+	int r;
+
+	memset(&bp, 0, sizeof(bp));
+	bp.byte_align = PAGE_SIZE;
+	bp.domain = AMDGPU_GEM_DOMAIN_GTT;
+	bp.flags = AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS |
+		   AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
+	bp.type = ttm_bo_type_kernel;
+	bp.size = size;
+	bp.resv = NULL;
+	bp.bo_ptr_size = sizeof(struct amdgpu_bo);
+
+	r = amdgpu_bo_create(adev, &bp, &userq_obj->obj);
+	if (r) {
+		DRM_ERROR("Failed to allocate BO for userqueue (%d)", r);
+		return r;
+	}
+
+	r = amdgpu_bo_reserve(userq_obj->obj, true);
+	if (r) {
+		DRM_ERROR("Failed to reserve BO to map (%d)", r);
+		goto free_obj;
+	}
+
+	r = amdgpu_ttm_alloc_gart(&(userq_obj->obj)->tbo);
+	if (r) {
+		DRM_ERROR("Failed to alloc GART for userqueue object (%d)", r);
+		goto unresv;
+	}
+
+	r = amdgpu_bo_kmap(userq_obj->obj, &userq_obj->cpu_ptr);
+	if (r) {
+		DRM_ERROR("Failed to map BO for userqueue (%d)", r);
+		goto unresv;
+	}
+
+	userq_obj->gpu_addr = amdgpu_bo_gpu_offset(userq_obj->obj);
+	amdgpu_bo_unreserve(userq_obj->obj);
+	memset(userq_obj->cpu_ptr, 0, size);
+	return 0;
+
+unresv:
+	amdgpu_bo_unreserve(userq_obj->obj);
+
+free_obj:
+	amdgpu_bo_unref(&userq_obj->obj);
+	return r;
+}
+
+void amdgpu_userqueue_destroy_object(struct amdgpu_userq_mgr *uq_mgr,
+				   struct amdgpu_userq_obj *userq_obj)
+{
+	amdgpu_bo_kunmap(userq_obj->obj);
+	amdgpu_bo_unref(&userq_obj->obj);
+}
+
 static int
 amdgpu_userqueue_destroy(struct drm_file *filp, int queue_id)
 {
diff --git a/drivers/gpu/drm/amd/include/amdgpu_userqueue.h b/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
index b739274c72e1..bbd29f68b8d4 100644
--- a/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
+++ b/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
@@ -29,6 +29,12 @@
 
 struct amdgpu_mqd_prop;
 
+struct amdgpu_userq_obj {
+	void		 *cpu_ptr;
+	uint64_t	 gpu_addr;
+	struct amdgpu_bo *obj;
+};
+
 struct amdgpu_usermode_queue {
 	int			queue_type;
 	uint64_t		doorbell_handle;
@@ -37,6 +43,7 @@ struct amdgpu_usermode_queue {
 	struct amdgpu_mqd_prop	*userq_prop;
 	struct amdgpu_userq_mgr *userq_mgr;
 	struct amdgpu_vm	*vm;
+	struct amdgpu_userq_obj mqd;
 };
 
 struct amdgpu_userq_funcs {
@@ -60,4 +67,10 @@ int amdgpu_userq_mgr_init(struct amdgpu_userq_mgr *userq_mgr, struct amdgpu_devi
 
 void amdgpu_userq_mgr_fini(struct amdgpu_userq_mgr *userq_mgr);
 
+int amdgpu_userqueue_create_object(struct amdgpu_userq_mgr *uq_mgr,
+				   struct amdgpu_userq_obj *userq_obj,
+				   int size);
+
+void amdgpu_userqueue_destroy_object(struct amdgpu_userq_mgr *uq_mgr,
+				     struct amdgpu_userq_obj *userq_obj);
 #endif
-- 
2.45.1