drm/amdgpu: move PT validation back into VM code v2

Saves a bunch of CPU cycles when swapping things back in and
allows us to split the VM headers into a separate file.

v2: rename parameters

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -915,8 +915,9 @@ void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm);
 void amdgpu_vm_get_pd_bo(struct amdgpu_vm *vm,
 			 struct list_head *validated,
 			 struct amdgpu_bo_list_entry *entry);
-void amdgpu_vm_get_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
-			  struct list_head *duplicates);
+int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
+			      int (*callback)(void *p, struct amdgpu_bo *bo),
+			      void *param);
 void amdgpu_vm_move_pt_bos_in_lru(struct amdgpu_device *adev,
 				  struct amdgpu_vm *vm);
 int amdgpu_vm_grab_id(struct amdgpu_vm *vm, struct amdgpu_ring *ring,

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

@@ -388,9 +388,9 @@ retry:
 
 /* Last resort, try to evict something from the current working set */
 static bool amdgpu_cs_try_evict(struct amdgpu_cs_parser *p,
-				struct amdgpu_bo_list_entry *lobj)
+				struct amdgpu_bo *validated)
 {
-	uint32_t domain = lobj->robj->allowed_domains;
+	uint32_t domain = validated->allowed_domains;
 	int r;
 
 	if (!p->evictable)
@@ -406,7 +406,7 @@ static bool amdgpu_cs_try_evict(struct amdgpu_cs_parser *p,
 		uint32_t other;
 
 		/* If we reached our current BO we can forget it */
-		if (candidate == lobj)
+		if (candidate->robj == validated)
 			break;
 
 		other = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type);
@@ -439,6 +439,23 @@ static bool amdgpu_cs_try_evict(struct amdgpu_cs_parser *p,
 	return false;
 }
 
+static int amdgpu_cs_validate(void *param, struct amdgpu_bo *bo)
+{
+	struct amdgpu_cs_parser *p = param;
+	int r;
+
+	do {
+		r = amdgpu_cs_bo_validate(p, bo);
+	} while (r == -ENOMEM && amdgpu_cs_try_evict(p, bo));
+	if (r)
+		return r;
+
+	if (bo->shadow)
+		r = amdgpu_cs_bo_validate(p, bo);
+
+	return r;
+}
+
 static int amdgpu_cs_list_validate(struct amdgpu_cs_parser *p,
 			    struct list_head *validated)
 {
@@ -466,18 +483,10 @@ static int amdgpu_cs_list_validate(struct amdgpu_cs_parser *p,
 		if (p->evictable == lobj)
 			p->evictable = NULL;
 
-		do {
-			r = amdgpu_cs_bo_validate(p, bo);
-		} while (r == -ENOMEM && amdgpu_cs_try_evict(p, lobj));
+		r = amdgpu_cs_validate(p, bo);
 		if (r)
 			return r;
 
-		if (bo->shadow) {
-			r = amdgpu_cs_bo_validate(p, bo);
-			if (r)
-				return r;
-		}
-
 		if (binding_userptr) {
 			drm_free_large(lobj->user_pages);
 			lobj->user_pages = NULL;
@@ -595,14 +604,19 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
 		list_splice(&need_pages, &p->validated);
 	}
 
-	amdgpu_vm_get_pt_bos(p->adev, &fpriv->vm, &duplicates);
-
 	p->bytes_moved_threshold = amdgpu_cs_get_threshold_for_moves(p->adev);
 	p->bytes_moved = 0;
 	p->evictable = list_last_entry(&p->validated,
 				       struct amdgpu_bo_list_entry,
 				       tv.head);
 
+	r = amdgpu_vm_validate_pt_bos(p->adev, &fpriv->vm,
+				      amdgpu_cs_validate, p);
+	if (r) {
+		DRM_ERROR("amdgpu_vm_validate_pt_bos() failed.\n");
+		goto error_validate;
+	}
+
 	r = amdgpu_cs_list_validate(p, &duplicates);
 	if (r) {
 		DRM_ERROR("amdgpu_cs_list_validate(duplicates) failed.\n");

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

@@ -469,6 +469,16 @@ out:
 	return r;
 }
 
+static int amdgpu_gem_va_check(void *param, struct amdgpu_bo *bo)
+{
+	unsigned domain = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type);
+
+	/* if anything is swapped out don't swap it in here,
+	   just abort and wait for the next CS */
+
+	return domain == AMDGPU_GEM_DOMAIN_CPU ? -ERESTARTSYS : 0;
+}
+
 /**
  * amdgpu_gem_va_update_vm -update the bo_va in its VM
  *
@@ -479,7 +489,8 @@ out:
  * vital here, so they are not reported back to userspace.
  */
 static void amdgpu_gem_va_update_vm(struct amdgpu_device *adev,
-				    struct amdgpu_bo_va *bo_va, uint32_t operation)
+				    struct amdgpu_bo_va *bo_va,
+				    uint32_t operation)
 {
 	struct ttm_validate_buffer tv, *entry;
 	struct amdgpu_bo_list_entry vm_pd;
@@ -502,7 +513,6 @@ static void amdgpu_gem_va_update_vm(struct amdgpu_device *adev,
 	if (r)
 		goto error_print;
 
-	amdgpu_vm_get_pt_bos(adev, bo_va->vm, &duplicates);
 	list_for_each_entry(entry, &list, head) {
 		domain = amdgpu_mem_type_to_domain(entry->bo->mem.mem_type);
 		/* if anything is swapped out don't swap it in here,
@@ -510,13 +520,10 @@ static void amdgpu_gem_va_update_vm(struct amdgpu_device *adev,
 		if (domain == AMDGPU_GEM_DOMAIN_CPU)
 			goto error_unreserve;
 	}
-	list_for_each_entry(entry, &duplicates, head) {
-		domain = amdgpu_mem_type_to_domain(entry->bo->mem.mem_type);
-		/* if anything is swapped out don't swap it in here,
-		   just abort and wait for the next CS */
-		if (domain == AMDGPU_GEM_DOMAIN_CPU)
-			goto error_unreserve;
-	}
+	r = amdgpu_vm_validate_pt_bos(adev, bo_va->vm, amdgpu_gem_va_check,
+				      NULL);
+	if (r)
+		goto error_unreserve;
 
 	r = amdgpu_vm_update_page_directory(adev, bo_va->vm);
 	if (r)
@@ -537,8 +544,6 @@ error_print:
 		DRM_ERROR("Couldn't update BO_VA (%d)\n", r);
 }
 
-
-
 int amdgpu_gem_va_ioctl(struct drm_device *dev, void *data,
 			  struct drm_file *filp)
 {

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

@@ -116,27 +116,29 @@ void amdgpu_vm_get_pd_bo(struct amdgpu_vm *vm,
 }
 
 /**
- * amdgpu_vm_get_bos - add the vm BOs to a duplicates list
+ * amdgpu_vm_validate_pt_bos - validate the page table BOs
  *
  * @adev: amdgpu device pointer
  * @vm: vm providing the BOs
- * @duplicates: head of duplicates list
+ * @validate: callback to do the validation
+ * @param: parameter for the validation callback
  *
- * Add the page directory to the BO duplicates list
- * for command submission.
+ * Validate the page table BOs on command submission if neccessary.
  */
-void amdgpu_vm_get_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
-			  struct list_head *duplicates)
+int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
+			      int (*validate)(void *p, struct amdgpu_bo *bo),
+			      void *param)
 {
 	uint64_t num_evictions;
 	unsigned i;
+	int r;
 
 	/* We only need to validate the page tables
 	 * if they aren't already valid.
 	 */
 	num_evictions = atomic64_read(&adev->num_evictions);
 	if (num_evictions == vm->last_eviction_counter)
-		return;
+		return 0;
 
 	/* add the vm page table to the list */
 	for (i = 0; i <= vm->max_pde_used; ++i) {
@@ -145,9 +147,12 @@ void amdgpu_vm_get_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 		if (!entry->robj)
 			continue;
 
-		list_add(&entry->tv.head, duplicates);
+		r = validate(param, entry->robj);
+		if (r)
+			return r;
 	}
 
+	return 0;
 }
 
 /**