/* * Copyright (C) 2015 Red Hat, Inc. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial * portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <linux/moduleparam.h> #include "virtgpu_drv.h" static int virtio_gpu_virglrenderer_workaround = 1;module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400); static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,				       uint32_t *resid){	if (virtio_gpu_virglrenderer_workaround) {		/*		 * Hack to avoid re-using resource IDs.		 *		 * virglrenderer versions up to (and including) 0.7.0		 * can't deal with that.  virglrenderer commit		 * "f91a9dd35715 Fix unlinking resources from hash		 * table." (Feb 2019) fixes the bug.		 */		static atomic_t seqno = ATOMIC_INIT(0);		int handle = atomic_inc_return(&seqno);		*resid = handle + 1;	} else {		int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);		if (handle < 0)			return handle;		*resid = handle + 1;	}	return 0;} static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id){	if (!virtio_gpu_virglrenderer_workaround) {		ida_free(&vgdev->resource_ida, id - 1);	}} static void virtio_gpu_free_object(struct drm_gem_object *obj){	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 	if (bo->pages)		virtio_gpu_object_detach(vgdev, bo);	if (bo->created)		virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle); 	drm_gem_shmem_free_object(obj);} static const struct drm_gem_object_funcs virtio_gpu_gem_funcs = {	.free = virtio_gpu_free_object,	.open = virtio_gpu_gem_object_open,	.close = virtio_gpu_gem_object_close, 	.print_info = drm_gem_shmem_print_info,	.pin = drm_gem_shmem_pin,	.unpin = drm_gem_shmem_unpin,	.get_sg_table = drm_gem_shmem_get_sg_table,	.vmap = drm_gem_shmem_vmap,	.vunmap = drm_gem_shmem_vunmap,	.mmap = &drm_gem_shmem_mmap,}; struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,						size_t size){	struct virtio_gpu_object *bo; 	bo = kzalloc(sizeof(*bo), GFP_KERNEL);	if (!bo)		return NULL; 	bo->base.base.funcs = &virtio_gpu_gem_funcs;	bo->base.map_cached = true;	return &bo->base.base;} int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,			     struct virtio_gpu_object_params *params,			     struct virtio_gpu_object **bo_ptr,			     struct virtio_gpu_fence *fence){	struct virtio_gpu_object_array *objs = NULL;	struct drm_gem_shmem_object *shmem_obj;	struct virtio_gpu_object *bo;	int ret; 	*bo_ptr = NULL; 	params->size = roundup(params->size, PAGE_SIZE);	shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);	if (IS_ERR(shmem_obj))		return PTR_ERR(shmem_obj);	bo = gem_to_virtio_gpu_obj(&shmem_obj->base); 	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);	if (ret < 0)		goto err_free_gem; 	bo->dumb = params->dumb; 	if (fence) {		ret = -ENOMEM;		objs = virtio_gpu_array_alloc(1);		if (!objs)			goto err_put_id;		virtio_gpu_array_add_obj(objs, &bo->base.base); 		ret = virtio_gpu_array_lock_resv(objs);		if (ret != 0)			goto err_put_objs;	} 	if (params->virgl) {		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,						  objs, fence);	} else {		virtio_gpu_cmd_create_resource(vgdev, bo, params,					       objs, fence);	} 	ret = virtio_gpu_object_attach(vgdev, bo, NULL);	if (ret != 0) {		virtio_gpu_free_object(&shmem_obj->base);		return ret;	} 	*bo_ptr = bo;	return 0; err_put_objs:	virtio_gpu_array_put_free(objs);err_put_id:	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);err_free_gem:	drm_gem_shmem_free_object(&shmem_obj->base);	return ret;}