drm/vmwgfx: Modify the resource validation interface

Allow selecting interruptible or uninterruptible waits to match
expectations of callers.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>

drivers/gpu/drm/vmwgfx/vmwgfx_drv.h

@@ -628,7 +628,7 @@ extern void vmw_resource_unreference(struct vmw_resource **p_res);
 extern struct vmw_resource *vmw_resource_reference(struct vmw_resource *res);
 extern struct vmw_resource *
 vmw_resource_reference_unless_doomed(struct vmw_resource *res);
-extern int vmw_resource_validate(struct vmw_resource *res);
+extern int vmw_resource_validate(struct vmw_resource *res, bool intr);
 extern int vmw_resource_reserve(struct vmw_resource *res, bool interruptible,
 				bool no_backup);
 extern bool vmw_resource_needs_backup(const struct vmw_resource *res);

drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c

@@ -659,7 +659,7 @@ static int vmw_resources_validate(struct vmw_sw_context *sw_context)
 		struct vmw_resource *res = val->res;
 		struct vmw_buffer_object *backup = res->backup;
 
-		ret = vmw_resource_validate(res);
+		ret = vmw_resource_validate(res, true);
 		if (unlikely(ret != 0)) {
 			if (ret != -ERESTARTSYS)
 				DRM_ERROR("Failed to validate resource.\n");

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -2713,7 +2713,7 @@ int vmw_kms_helper_resource_prepare(struct vmw_resource *res,
 
 		ctx->buf = vmw_bo_reference(res->backup);
 	}
-	ret = vmw_resource_validate(res);
+	ret = vmw_resource_validate(res, interruptible);
 	if (ret)
 		goto out_revert;
 	return 0;

drivers/gpu/drm/vmwgfx/vmwgfx_resource.c

@@ -587,15 +587,18 @@ static int vmw_resource_do_evict(struct ww_acquire_ctx *ticket,
 /**
  * vmw_resource_validate - Make a resource up-to-date and visible
  *                         to the device.
- *
- * @res:            The resource to make visible to the device.
+ * @res: The resource to make visible to the device.
+ * @intr: Perform waits interruptible if possible.
  *
  * On succesful return, any backup DMA buffer pointed to by @res->backup will
  * be reserved and validated.
  * On hardware resource shortage, this function will repeatedly evict
  * resources of the same type until the validation succeeds.
+ *
+ * Return: Zero on success, -ERESTARTSYS if interrupted, negative error code
+ * on failure.
  */
-int vmw_resource_validate(struct vmw_resource *res)
+int vmw_resource_validate(struct vmw_resource *res, bool intr)
 {
 	int ret;
 	struct vmw_resource *evict_res;
@@ -633,7 +636,7 @@ int vmw_resource_validate(struct vmw_resource *res)
 		write_unlock(&dev_priv->resource_lock);
 
 		/* Trylock backup buffers with a NULL ticket. */
-		ret = vmw_resource_do_evict(NULL, evict_res, true);
+		ret = vmw_resource_do_evict(NULL, evict_res, intr);
 		if (unlikely(ret != 0)) {
 			write_lock(&dev_priv->resource_lock);
 			list_add_tail(&evict_res->lru_head, lru_list);
@@ -914,7 +917,7 @@ int vmw_resource_pin(struct vmw_resource *res, bool interruptible)
 			/* Do we really need to pin the MOB as well? */
 			vmw_bo_pin_reserved(vbo, true);
 		}
-		ret = vmw_resource_validate(res);
+		ret = vmw_resource_validate(res, interruptible);
 		if (vbo)
 			ttm_bo_unreserve(&vbo->base);
 		if (ret)

drivers/gpu/drm/vmwgfx/vmwgfx_validation.c

@@ -479,7 +479,7 @@ int vmw_validation_res_validate(struct vmw_validation_context *ctx, bool intr)
 		struct vmw_resource *res = val->res;
 		struct vmw_buffer_object *backup = res->backup;
 
-		ret = vmw_resource_validate(res);
+		ret = vmw_resource_validate(res, intr);
 		if (ret) {
 			if (ret != -ERESTARTSYS)
 				DRM_ERROR("Failed to validate resource.\n");