drm/amdkfd: Native mode memory partition support

For native mode, after amdgpu_bo is created on CPU domain, then call
amdgpu_ttm_tt_set_mem_pool to select the TTM pool using bo->mem_id.
ttm_bo_validate will allocate the memory to the correct memory partition
before mapping to GPUs.
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-and-tested-by: Mukul Joshi <mukul.joshi@amd.com>
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1643,6 +1643,7 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
 	uint64_t aligned_size;
 	u64 alloc_flags;
 	int ret;
+	int mem_id = 0; /* Fixme : to be changed when mem_id support patch lands, until then NPS1, SPX only */
 
 	/*
 	 * Check on which domain to allocate BO
@@ -1750,6 +1751,11 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
 	    ((*mem)->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_VRAM)) {
 		bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
 		bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
+		ret = amdgpu_ttm_tt_set_mem_pool(&bo->tbo, mem_id);
+		if (ret) {
+			pr_debug("failed to set ttm mem pool %d\n", ret);
+			goto err_set_mem_partition;
+		}
 	}
 
 	add_kgd_mem_to_kfd_bo_list(*mem, avm->process_info, user_addr);
@@ -1778,6 +1784,7 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
 allocate_init_user_pages_failed:
 err_pin_bo:
 	remove_kgd_mem_from_kfd_bo_list(*mem, avm->process_info);
+err_set_mem_partition:
 	drm_vma_node_revoke(&gobj->vma_node, drm_priv);
 err_node_allow:
 	/* Don't unreserve system mem limit twice */

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

@@ -1155,6 +1155,24 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_device *bdev,
 	return ttm_pool_free(pool, ttm);
 }
 
+/**
+ * amdgpu_ttm_tt_set_mem_pool - Set the TTM memory pool for the TTM BO
+ * @tbo: The ttm_buffer_object that backs the VRAM bo
+ * @mem_id: to select the initialized ttm pool corresponding to the memory partition
+ */
+int amdgpu_ttm_tt_set_mem_pool(struct ttm_buffer_object *tbo, int mem_id)
+{
+	struct ttm_tt *ttm = tbo->ttm;
+	struct amdgpu_ttm_tt *gtt;
+
+	if (!ttm && !ttm_tt_is_populated(ttm))
+		return -EINVAL;
+
+	gtt = ttm_to_amdgpu_ttm_tt(ttm);
+	gtt->pool_id = mem_id;
+	return 0;
+}
+
 /**
  * amdgpu_ttm_tt_get_userptr - Return the userptr GTT ttm_tt for the current
  * task

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

@@ -192,6 +192,7 @@ bool amdgpu_ttm_tt_has_userptr(struct ttm_tt *ttm);
 struct mm_struct *amdgpu_ttm_tt_get_usermm(struct ttm_tt *ttm);
 bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
 				  unsigned long end, unsigned long *userptr);
+int amdgpu_ttm_tt_set_mem_pool(struct ttm_buffer_object *tbo, int mem_id);
 bool amdgpu_ttm_tt_userptr_invalidated(struct ttm_tt *ttm,
 				       int *last_invalidated);
 bool amdgpu_ttm_tt_is_userptr(struct ttm_tt *ttm);