drm/amdgpu: Rename kfd_bo_va_list to kfd_mem_attachment

This name is more fitting, especially for the changes coming next to
support multi-GPU systems with proper DMA mappings. Cleaned up the code
and renamed some related functions and variables to improve readability.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Oak Zeng <Oak.Zeng@amd.com>
Acked-by: Ramesh Errabolu <Ramesh.Errabolu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -44,10 +44,10 @@ enum TLB_FLUSH_TYPE {
 
 struct amdgpu_device;
 
-struct kfd_bo_va_list {
-	struct list_head bo_list;
+struct kfd_mem_attachment {
+	struct list_head list;
 	struct amdgpu_bo_va *bo_va;
-	void *kgd_dev;
+	struct amdgpu_device *adev;
 	bool is_mapped;
 	uint64_t va;
 	uint64_t pte_flags;
@@ -56,7 +56,7 @@ struct kfd_bo_va_list {
 struct kgd_mem {
 	struct mutex lock;
 	struct amdgpu_bo *bo;
-	struct list_head bo_va_list;
+	struct list_head attachments;
 	/* protected by amdkfd_process_info.lock */
 	struct ttm_validate_buffer validate_list;
 	struct ttm_validate_buffer resv_list;

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

@@ -72,16 +72,16 @@ static inline struct amdgpu_device *get_amdgpu_device(struct kgd_dev *kgd)
 	return (struct amdgpu_device *)kgd;
 }
 
-static bool check_if_add_bo_to_vm(struct amdgpu_vm *avm,
+static bool kfd_mem_is_attached(struct amdgpu_vm *avm,
 		struct kgd_mem *mem)
 {
-	struct kfd_bo_va_list *entry;
+	struct kfd_mem_attachment *entry;
 
-	list_for_each_entry(entry, &mem->bo_va_list, bo_list)
+	list_for_each_entry(entry, &mem->attachments, list)
 		if (entry->bo_va->base.vm == avm)
-			return false;
-
 			return true;
+
+	return false;
 }
 
 /* Set memory usage limits. Current, limits are
@@ -475,7 +475,7 @@ static uint64_t get_pte_flags(struct amdgpu_device *adev, struct kgd_mem *mem)
 	return pte_flags;
 }
 
-/* add_bo_to_vm - Add a BO to a VM
+/* kfd_mem_attach - Add a BO to a VM
  *
  * Everything that needs to bo done only once when a BO is first added
  * to a VM. It can later be mapped and unmapped many times without
@@ -487,15 +487,14 @@ static uint64_t get_pte_flags(struct amdgpu_device *adev, struct kgd_mem *mem)
  * 4. Alloc page tables and directories if needed
  * 4a.  Validate new page tables and directories
  */
-static int add_bo_to_vm(struct amdgpu_device *adev, struct kgd_mem *mem,
+static int kfd_mem_attach(struct amdgpu_device *adev, struct kgd_mem *mem,
 		struct amdgpu_vm *vm, bool is_aql,
-		struct kfd_bo_va_list **p_bo_va_entry)
+		struct kfd_mem_attachment **p_attachment)
 {
 	int ret;
-	struct kfd_bo_va_list *bo_va_entry;
+	struct kfd_mem_attachment *attachment;
 	struct amdgpu_bo *bo = mem->bo;
 	uint64_t va = mem->va;
-	struct list_head *list_bo_va = &mem->bo_va_list;
 	unsigned long bo_size = bo->tbo.base.size;
 
 	if (!va) {
@@ -506,29 +505,29 @@ static int add_bo_to_vm(struct amdgpu_device *adev, struct kgd_mem *mem,
 	if (is_aql)
 		va += bo_size;
 
-	bo_va_entry = kzalloc(sizeof(*bo_va_entry), GFP_KERNEL);
-	if (!bo_va_entry)
+	attachment = kzalloc(sizeof(*attachment), GFP_KERNEL);
+	if (!attachment)
 		return -ENOMEM;
 
 	pr_debug("\t add VA 0x%llx - 0x%llx to vm %p\n", va,
 			va + bo_size, vm);
 
 	/* Add BO to VM internal data structures*/
-	bo_va_entry->bo_va = amdgpu_vm_bo_add(adev, vm, bo);
-	if (!bo_va_entry->bo_va) {
+	attachment->bo_va = amdgpu_vm_bo_add(adev, vm, bo);
+	if (!attachment->bo_va) {
 		ret = -EINVAL;
 		pr_err("Failed to add BO object to VM. ret == %d\n",
 				ret);
 		goto err_vmadd;
 	}
 
-	bo_va_entry->va = va;
-	bo_va_entry->pte_flags = get_pte_flags(adev, mem);
-	bo_va_entry->kgd_dev = (void *)adev;
-	list_add(&bo_va_entry->bo_list, list_bo_va);
+	attachment->va = va;
+	attachment->pte_flags = get_pte_flags(adev, mem);
+	attachment->adev = adev;
+	list_add(&attachment->list, &mem->attachments);
 
-	if (p_bo_va_entry)
-		*p_bo_va_entry = bo_va_entry;
+	if (p_attachment)
+		*p_attachment = attachment;
 
 	/* Allocate validate page tables if needed */
 	ret = vm_validate_pt_pd_bos(vm);
@@ -540,22 +539,20 @@ static int add_bo_to_vm(struct amdgpu_device *adev, struct kgd_mem *mem,
 	return 0;
 
 err_alloc_pts:
-	amdgpu_vm_bo_rmv(adev, bo_va_entry->bo_va);
-	list_del(&bo_va_entry->bo_list);
+	amdgpu_vm_bo_rmv(adev, attachment->bo_va);
+	list_del(&attachment->list);
 err_vmadd:
-	kfree(bo_va_entry);
+	kfree(attachment);
 	return ret;
 }
 
-static void remove_bo_from_vm(struct amdgpu_device *adev,
-		struct kfd_bo_va_list *entry, unsigned long size)
+static void kfd_mem_detach(struct kfd_mem_attachment *attachment)
 {
-	pr_debug("\t remove VA 0x%llx - 0x%llx in entry %p\n",
-			entry->va,
-			entry->va + size, entry);
-	amdgpu_vm_bo_rmv(adev, entry->bo_va);
-	list_del(&entry->bo_list);
-	kfree(entry);
+	pr_debug("\t remove VA 0x%llx in entry %p\n",
+			attachment->va, attachment);
+	amdgpu_vm_bo_rmv(attachment->adev, attachment->bo_va);
+	list_del(&attachment->list);
+	kfree(attachment);
 }
 
 static void add_kgd_mem_to_kfd_bo_list(struct kgd_mem *mem,
@@ -730,7 +727,7 @@ static int reserve_bo_and_cond_vms(struct kgd_mem *mem,
 				struct bo_vm_reservation_context *ctx)
 {
 	struct amdgpu_bo *bo = mem->bo;
-	struct kfd_bo_va_list *entry;
+	struct kfd_mem_attachment *entry;
 	unsigned int i;
 	int ret;
 
@@ -742,7 +739,7 @@ static int reserve_bo_and_cond_vms(struct kgd_mem *mem,
 	INIT_LIST_HEAD(&ctx->list);
 	INIT_LIST_HEAD(&ctx->duplicates);
 
-	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
+	list_for_each_entry(entry, &mem->attachments, list) {
 		if ((vm && vm != entry->bo_va->base.vm) ||
 			(entry->is_mapped != map_type
 			&& map_type != BO_VM_ALL))
@@ -764,7 +761,7 @@ static int reserve_bo_and_cond_vms(struct kgd_mem *mem,
 	list_add(&ctx->kfd_bo.tv.head, &ctx->list);
 
 	i = 0;
-	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
+	list_for_each_entry(entry, &mem->attachments, list) {
 		if ((vm && vm != entry->bo_va->base.vm) ||
 			(entry->is_mapped != map_type
 			&& map_type != BO_VM_ALL))
@@ -819,7 +816,7 @@ static int unreserve_bo_and_vms(struct bo_vm_reservation_context *ctx,
 }
 
 static int unmap_bo_from_gpuvm(struct amdgpu_device *adev,
-				struct kfd_bo_va_list *entry,
+				struct kfd_mem_attachment *entry,
 				struct amdgpu_sync *sync)
 {
 	struct amdgpu_bo_va *bo_va = entry->bo_va;
@@ -835,7 +832,7 @@ static int unmap_bo_from_gpuvm(struct amdgpu_device *adev,
 }
 
 static int update_gpuvm_pte(struct amdgpu_device *adev,
-		struct kfd_bo_va_list *entry,
+		struct kfd_mem_attachment *entry,
 		struct amdgpu_sync *sync)
 {
 	int ret;
@@ -852,7 +849,7 @@ static int update_gpuvm_pte(struct amdgpu_device *adev,
 }
 
 static int map_bo_to_gpuvm(struct amdgpu_device *adev,
-		struct kfd_bo_va_list *entry, struct amdgpu_sync *sync,
+		struct kfd_mem_attachment *entry, struct amdgpu_sync *sync,
 		bool no_update_pte)
 {
 	int ret;
@@ -1196,7 +1193,7 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
 		ret = -ENOMEM;
 		goto err;
 	}
-	INIT_LIST_HEAD(&(*mem)->bo_va_list);
+	INIT_LIST_HEAD(&(*mem)->attachments);
 	mutex_init(&(*mem)->lock);
 	(*mem)->aql_queue = !!(flags & KFD_IOC_ALLOC_MEM_FLAGS_AQL_QUEUE_MEM);
 
@@ -1285,7 +1282,7 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
 {
 	struct amdkfd_process_info *process_info = mem->process_info;
 	unsigned long bo_size = mem->bo->tbo.base.size;
-	struct kfd_bo_va_list *entry, *tmp;
+	struct kfd_mem_attachment *entry, *tmp;
 	struct bo_vm_reservation_context ctx;
 	struct ttm_validate_buffer *bo_list_entry;
 	unsigned int mapped_to_gpu_memory;
@@ -1329,9 +1326,8 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
 		mem->va + bo_size * (1 + mem->aql_queue));
 
 	/* Remove from VM internal data structures */
-	list_for_each_entry_safe(entry, tmp, &mem->bo_va_list, bo_list)
-		remove_bo_from_vm((struct amdgpu_device *)entry->kgd_dev,
-				entry, bo_size);
+	list_for_each_entry_safe(entry, tmp, &mem->attachments, list)
+		kfd_mem_detach(entry);
 
 	ret = unreserve_bo_and_vms(&ctx, false, false);
 
@@ -1374,10 +1370,10 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
 	int ret;
 	struct amdgpu_bo *bo;
 	uint32_t domain;
-	struct kfd_bo_va_list *entry;
+	struct kfd_mem_attachment *entry;
 	struct bo_vm_reservation_context ctx;
-	struct kfd_bo_va_list *bo_va_entry = NULL;
-	struct kfd_bo_va_list *bo_va_entry_aql = NULL;
+	struct kfd_mem_attachment *attachment = NULL;
+	struct kfd_mem_attachment *attachment_aql = NULL;
 	unsigned long bo_size;
 	bool is_invalid_userptr = false;
 
@@ -1426,21 +1422,20 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
 	    bo->tbo.mem.mem_type == TTM_PL_SYSTEM)
 		is_invalid_userptr = true;
 
-	if (check_if_add_bo_to_vm(avm, mem)) {
-		ret = add_bo_to_vm(adev, mem, avm, false,
-				&bo_va_entry);
+	if (!kfd_mem_is_attached(avm, mem)) {
+		ret = kfd_mem_attach(adev, mem, avm, false, &attachment);
 		if (ret)
-			goto add_bo_to_vm_failed;
+			goto attach_failed;
 		if (mem->aql_queue) {
-			ret = add_bo_to_vm(adev, mem, avm,
-					true, &bo_va_entry_aql);
+			ret = kfd_mem_attach(adev, mem, avm, true,
+					     &attachment_aql);
 			if (ret)
-				goto add_bo_to_vm_failed_aql;
+				goto attach_failed_aql;
 		}
 	} else {
 		ret = vm_validate_pt_pd_bos(avm);
 		if (unlikely(ret))
-			goto add_bo_to_vm_failed;
+			goto attach_failed;
 	}
 
 	if (mem->mapped_to_gpu_memory == 0 &&
@@ -1456,11 +1451,12 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
 		}
 	}
 
-	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
-		if (entry->bo_va->base.vm == avm && !entry->is_mapped) {
+	list_for_each_entry(entry, &mem->attachments, list) {
+		if (entry->bo_va->base.vm != avm || entry->is_mapped)
+			continue;
+
 		pr_debug("\t map VA 0x%llx - 0x%llx in entry %p\n",
-					entry->va, entry->va + bo_size,
-					entry);
+			 entry->va, entry->va + bo_size, entry);
 
 		ret = map_bo_to_gpuvm(adev, entry, ctx.sync,
 				      is_invalid_userptr);
@@ -1480,7 +1476,6 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
 		pr_debug("\t INC mapping count %d\n",
 			 mem->mapped_to_gpu_memory);
 	}
-	}
 
 	if (!amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) && !bo->tbo.pin_count)
 		amdgpu_bo_fence(bo,
@@ -1491,12 +1486,12 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
 	goto out;
 
 map_bo_to_gpuvm_failed:
-	if (bo_va_entry_aql)
-		remove_bo_from_vm(adev, bo_va_entry_aql, bo_size);
-add_bo_to_vm_failed_aql:
-	if (bo_va_entry)
-		remove_bo_from_vm(adev, bo_va_entry, bo_size);
-add_bo_to_vm_failed:
+	if (attachment_aql)
+		kfd_mem_detach(attachment_aql);
+attach_failed_aql:
+	if (attachment)
+		kfd_mem_detach(attachment);
+attach_failed:
 	unreserve_bo_and_vms(&ctx, false, false);
 out:
 	mutex_unlock(&mem->process_info->lock);
@@ -1511,7 +1506,7 @@ int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
 	struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
 	struct amdkfd_process_info *process_info = avm->process_info;
 	unsigned long bo_size = mem->bo->tbo.base.size;
-	struct kfd_bo_va_list *entry;
+	struct kfd_mem_attachment *entry;
 	struct bo_vm_reservation_context ctx;
 	int ret;
 
@@ -1535,19 +1530,18 @@ int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
 		mem->va + bo_size * (1 + mem->aql_queue),
 		avm);
 
-	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
-		if (entry->bo_va->base.vm == avm && entry->is_mapped) {
+	list_for_each_entry(entry, &mem->attachments, list) {
+		if (entry->bo_va->base.vm != avm || !entry->is_mapped)
+			continue;
+
 		pr_debug("\t unmap VA 0x%llx - 0x%llx from entry %p\n",
-					entry->va,
-					entry->va + bo_size,
-					entry);
+			 entry->va, entry->va + bo_size, entry);
 
 		ret = unmap_bo_from_gpuvm(adev, entry, ctx.sync);
 		if (ret == 0) {
 			entry->is_mapped = false;
 		} else {
-				pr_err("failed to unmap VA 0x%llx\n",
-						mem->va);
+			pr_err("failed to unmap VA 0x%llx\n", mem->va);
 			goto unreserve_out;
 		}
 
@@ -1555,7 +1549,6 @@ int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
 		pr_debug("\t DEC mapping count %d\n",
 			 mem->mapped_to_gpu_memory);
 	}
-	}
 
 	/* If BO is unmapped from all VMs, unfence it. It can be evicted if
 	 * required.
@@ -1703,7 +1696,7 @@ int amdgpu_amdkfd_gpuvm_import_dmabuf(struct kgd_dev *kgd,
 	if (mmap_offset)
 		*mmap_offset = amdgpu_bo_mmap_offset(bo);
 
-	INIT_LIST_HEAD(&(*mem)->bo_va_list);
+	INIT_LIST_HEAD(&(*mem)->attachments);
 	mutex_init(&(*mem)->lock);
 
 	(*mem)->alloc_flags =
@@ -1900,7 +1893,7 @@ static int validate_invalid_user_pages(struct amdkfd_process_info *process_info)
 	list_for_each_entry_safe(mem, tmp_mem,
 				 &process_info->userptr_inval_list,
 				 validate_list.head) {
-		struct kfd_bo_va_list *bo_va_entry;
+		struct kfd_mem_attachment *attachment;
 
 		bo = mem->bo;
 
@@ -1923,13 +1916,13 @@ static int validate_invalid_user_pages(struct amdkfd_process_info *process_info)
 		 * VM faults if the GPU tries to access the invalid
 		 * memory.
 		 */
-		list_for_each_entry(bo_va_entry, &mem->bo_va_list, bo_list) {
-			if (!bo_va_entry->is_mapped)
+		list_for_each_entry(attachment, &mem->attachments, list) {
+			if (!attachment->is_mapped)
 				continue;
 
 			ret = update_gpuvm_pte((struct amdgpu_device *)
-					       bo_va_entry->kgd_dev,
-					       bo_va_entry, &sync);
+					       attachment->adev,
+					       attachment, &sync);
 			if (ret) {
 				pr_err("%s: update PTE failed\n", __func__);
 				/* make sure this gets validated again */
@@ -2110,7 +2103,7 @@ int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef)
 
 		struct amdgpu_bo *bo = mem->bo;
 		uint32_t domain = mem->domain;
-		struct kfd_bo_va_list *bo_va_entry;
+		struct kfd_mem_attachment *attachment;
 
 		total_size += amdgpu_bo_size(bo);
 
@@ -2130,11 +2123,9 @@ int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef)
 			pr_debug("Memory eviction: Sync BO fence failed. Try again\n");
 			goto validate_map_fail;
 		}
-		list_for_each_entry(bo_va_entry, &mem->bo_va_list,
-				    bo_list) {
+		list_for_each_entry(attachment, &mem->attachments, list) {
 			ret = update_gpuvm_pte((struct amdgpu_device *)
-					      bo_va_entry->kgd_dev,
-					      bo_va_entry,
+					      attachment->adev, attachment,
 					      &sync_obj);
 			if (ret) {
 				pr_debug("Memory eviction: update PTE failed. Try again\n");
@@ -2210,7 +2201,7 @@ int amdgpu_amdkfd_add_gws_to_process(void *info, void *gws, struct kgd_mem **mem
 		return -ENOMEM;
 
 	mutex_init(&(*mem)->lock);
-	INIT_LIST_HEAD(&(*mem)->bo_va_list);
+	INIT_LIST_HEAD(&(*mem)->attachments);
 	(*mem)->bo = amdgpu_bo_ref(gws_bo);
 	(*mem)->domain = AMDGPU_GEM_DOMAIN_GWS;
 	(*mem)->process_info = process_info;