drm/amdgpu/display: Implement functions to let DC allocate GPU memory

[Why]
DC needs to communicate with PM FW through GPU memory. In order
to do so we need to be able to allocate memory from within DC.

[How]
Call amdgpu_bo_create_kernel to allocate GPU memory and use a
list in amdgpu_display_manager to track our allocations so we
can clean them up later.

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Zhan Liu <zhan.liu@amd.com>
Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Acked-by: Zhan Liu <zhan.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 37 insertions, 3 deletions

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index b459f4d36405..b0e49d01c206 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -652,8 +652,31 @@ void *dm_helpers_allocate_gpu_mem(
 		size_t size,
 		long long *addr)
 {
-	// TODO
-	return NULL;
+	struct amdgpu_device *adev = ctx->driver_context;
+	struct dal_allocation *da;
+	u32 domain = (type == DC_MEM_ALLOC_TYPE_GART) ?
+		AMDGPU_GEM_DOMAIN_GTT : AMDGPU_GEM_DOMAIN_VRAM;
+	int ret;
+
+	da = kzalloc(sizeof(struct dal_allocation), GFP_KERNEL);
+	if (!da)
+		return NULL;
+
+	ret = amdgpu_bo_create_kernel(adev, size, PAGE_SIZE,
+				      domain, &da->bo,
+				      &da->gpu_addr, &da->cpu_ptr);
+
+	*addr = da->gpu_addr;
+
+	if (ret) {
+		kfree(da);
+		return NULL;
+	}
+
+	/* add da to list in dm */
+	list_add(&da->list, &adev->dm.da_list);
+
+	return da->cpu_ptr;
 }
 
 void dm_helpers_free_gpu_mem(
@@ -661,7 +684,18 @@ void dm_helpers_free_gpu_mem(
 		enum dc_gpu_mem_alloc_type type,
 		void *pvMem)
 {
-	// TODO
+	struct amdgpu_device *adev = ctx->driver_context;
+	struct dal_allocation *da;
+
+	/* walk the da list in DM */
+	list_for_each_entry(da, &adev->dm.da_list, list) {
+		if (pvMem == da->cpu_ptr) {
+			amdgpu_bo_free_kernel(&da->bo, &da->gpu_addr, &da->cpu_ptr);
+			list_del(&da->list);
+			kfree(da);
+			break;
+		}
+	}
 }
 
 bool dm_helpes_dmub_outbox0_interrupt_control(struct dc_context *ctx, bool enable)