[PATCH v2 06/10] drm/amdgpu: DMA map/unmap when updating GPU mappings

[Felix Kuehling]

DMA map kfd_mem_attachments in update_gpuvm_pte. This function is called
with the BO and page tables reserved, so we can safely update the DMA
mapping.

DMA unmap when a BO is unmapped from a GPU and before updating mappings
in restore workers.

Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
 .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  | 56 ++++++++++---------
 1 file changed, 29 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 49d1af4aa5f1..7d25d886b98c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -961,11 +961,12 @@ static int unreserve_bo_and_vms(struct bo_vm_reservation_context *ctx,
 	return ret;
 }
 
-static int unmap_bo_from_gpuvm(struct amdgpu_device *adev,
+static void unmap_bo_from_gpuvm(struct kgd_mem *mem,
 				struct kfd_mem_attachment *entry,
 				struct amdgpu_sync *sync)
 {
 	struct amdgpu_bo_va *bo_va = entry->bo_va;
+	struct amdgpu_device *adev = entry->adev;
 	struct amdgpu_vm *vm = bo_va->base.vm;
 
 	amdgpu_vm_bo_unmap(adev, bo_va, entry->va);
@@ -974,15 +975,20 @@ static int unmap_bo_from_gpuvm(struct amdgpu_device *adev,
 
 	amdgpu_sync_fence(sync, bo_va->last_pt_update);
 
-	return 0;
+	kfd_mem_dmaunmap_attachment(mem, entry);
 }
 
-static int update_gpuvm_pte(struct amdgpu_device *adev,
-		struct kfd_mem_attachment *entry,
-		struct amdgpu_sync *sync)
+static int update_gpuvm_pte(struct kgd_mem *mem,
+			    struct kfd_mem_attachment *entry,
+			    struct amdgpu_sync *sync)
 {
-	int ret;
 	struct amdgpu_bo_va *bo_va = entry->bo_va;
+	struct amdgpu_device *adev = entry->adev;
+	int ret;
+
+	ret = kfd_mem_dmamap_attachment(mem, entry);
+	if (ret)
+		return ret;
 
 	/* Update the page tables  */
 	ret = amdgpu_vm_bo_update(adev, bo_va, false);
@@ -994,14 +1000,15 @@ static int update_gpuvm_pte(struct amdgpu_device *adev,
 	return amdgpu_sync_fence(sync, bo_va->last_pt_update);
 }
 
-static int map_bo_to_gpuvm(struct amdgpu_device *adev,
-		struct kfd_mem_attachment *entry, struct amdgpu_sync *sync,
-		bool no_update_pte)
+static int map_bo_to_gpuvm(struct kgd_mem *mem,
+			   struct kfd_mem_attachment *entry,
+			   struct amdgpu_sync *sync,
+			   bool no_update_pte)
 {
 	int ret;
 
 	/* Set virtual address for the allocation */
-	ret = amdgpu_vm_bo_map(adev, entry->bo_va, entry->va, 0,
+	ret = amdgpu_vm_bo_map(entry->adev, entry->bo_va, entry->va, 0,
 			       amdgpu_bo_size(entry->bo_va->base.bo),
 			       entry->pte_flags);
 	if (ret) {
@@ -1013,7 +1020,7 @@ static int map_bo_to_gpuvm(struct amdgpu_device *adev,
 	if (no_update_pte)
 		return 0;
 
-	ret = update_gpuvm_pte(adev, entry, sync);
+	ret = update_gpuvm_pte(mem, entry, sync);
 	if (ret) {
 		pr_err("update_gpuvm_pte() failed\n");
 		goto update_gpuvm_pte_failed;
@@ -1022,7 +1029,7 @@ static int map_bo_to_gpuvm(struct amdgpu_device *adev,
 	return 0;
 
 update_gpuvm_pte_failed:
-	unmap_bo_from_gpuvm(adev, entry, sync);
+	unmap_bo_from_gpuvm(mem, entry, sync);
 	return ret;
 }
 
@@ -1596,7 +1603,7 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
 		pr_debug("\t map VA 0x%llx - 0x%llx in entry %p\n",
 			 entry->va, entry->va + bo_size, entry);
 
-		ret = map_bo_to_gpuvm(adev, entry, ctx.sync,
+		ret = map_bo_to_gpuvm(mem, entry, ctx.sync,
 				      is_invalid_userptr);
 		if (ret) {
 			pr_err("Failed to map bo to gpuvm\n");
@@ -1635,7 +1642,6 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
 int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
 		struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv)
 {
-	struct amdgpu_device *adev = get_amdgpu_device(kgd);
 	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;
@@ -1670,13 +1676,8 @@ int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
 		pr_debug("\t unmap VA 0x%llx - 0x%llx from entry %p\n",
 			 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);
-			goto unreserve_out;
-		}
+		unmap_bo_from_gpuvm(mem, entry, ctx.sync);
+		entry->is_mapped = false;
 
 		mem->mapped_to_gpu_memory--;
 		pr_debug("\t DEC mapping count %d\n",
@@ -2053,9 +2054,8 @@ static int validate_invalid_user_pages(struct amdkfd_process_info *process_info)
 			if (!attachment->is_mapped)
 				continue;
 
-			ret = update_gpuvm_pte((struct amdgpu_device *)
-					       attachment->adev,
-					       attachment, &sync);
+			kfd_mem_dmaunmap_attachment(mem, attachment);
+			ret = update_gpuvm_pte(mem, attachment, &sync);
 			if (ret) {
 				pr_err("%s: update PTE failed\n", __func__);
 				/* make sure this gets validated again */
@@ -2257,9 +2257,11 @@ int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef)
 			goto validate_map_fail;
 		}
 		list_for_each_entry(attachment, &mem->attachments, list) {
-			ret = update_gpuvm_pte((struct amdgpu_device *)
-					      attachment->adev, attachment,
-					      &sync_obj);
+			if (!attachment->is_mapped)
+				continue;
+
+			kfd_mem_dmaunmap_attachment(mem, attachment);
+			ret = update_gpuvm_pte(mem, attachment, &sync_obj);
 			if (ret) {
 				pr_debug("Memory eviction: update PTE failed. Try again\n");
 				goto validate_map_fail;
-- 
2.31.1