drm/amd: Add new kfd-->kgd interface for gart usage

This patch adds two new functions to the kfd-->kgd interface:

init_gtt_mem_allocation, which allocate a large enough buffer on the amdkfd
needs, such as mqds, hpds, kernel queue, fence and runlists. This function
is only called once per GPU device. The size of the allocated buffer is
based on the maximum number of HSA processes and maximum number of queues
per HSA process (two amdkfd kernel module parameters).

free_gtt_mem, which frees a buffer that was allocated on the gart aperture.
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Reviewed-by: Alexey Skidanov <Alexey.skidanov@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/kgd_kfd_interface.h

@@ -122,6 +122,11 @@ struct kgd2kfd_calls {
  *
  * @free_mem: Frees a buffer that was allocated by amdkfd's sa manager
  *
+ * @init_gtt_mem_allocation: Allocate a buffer on the gart aperture.
+ * The buffer can be used for mqds, hpds, kernel queue, fence and runlists
+ *
+ * @free_gtt_mem: Frees a buffer that was allocated on the gart aperture
+ *
  * @get_vmem_size: Retrieves (physical) size of VRAM
  *
  * @get_gpu_clock_counter: Retrieves GPU clock counter
@@ -168,8 +173,12 @@ struct kfd2kgd_calls {
 	void (*fini_sa_manager)(struct kgd_dev *kgd);
 	int (*allocate_mem)(struct kgd_dev *kgd, size_t size, size_t alignment,
 			enum kgd_memory_pool pool, struct kgd_mem **mem);
+	int (*init_gtt_mem_allocation)(struct kgd_dev *kgd, size_t size,
+					void **mem_obj, uint64_t *gpu_addr,
+					void **cpu_ptr);
 
 	void (*free_mem)(struct kgd_dev *kgd, struct kgd_mem *mem);
+	void (*free_gtt_mem)(struct kgd_dev *kgd, void *mem_obj);
 
 	uint64_t (*get_vmem_size)(struct kgd_dev *kgd);
 	uint64_t (*get_gpu_clock_counter)(struct kgd_dev *kgd);