/* * 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/dma-mapping.h>#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); 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);	}} void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo){	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);	if (virtio_gpu_is_shmem(bo)) {		struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo); 		if (shmem->pages) {			if (shmem->mapped) {				dma_unmap_sgtable(vgdev->vdev->dev.parent,					     shmem->pages, DMA_TO_DEVICE, 0);				shmem->mapped = 0;			} 			sg_free_table(shmem->pages);			kfree(shmem->pages);			shmem->pages = NULL;			drm_gem_shmem_unpin(&bo->base.base);		} 		drm_gem_shmem_free_object(&bo->base.base);	} else if (virtio_gpu_is_vram(bo)) {		struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo); 		spin_lock(&vgdev->host_visible_lock);		if (drm_mm_node_allocated(&vram->vram_node))			drm_mm_remove_node(&vram->vram_node); 		spin_unlock(&vgdev->host_visible_lock); 		drm_gem_free_mmap_offset(&vram->base.base.base);		drm_gem_object_release(&vram->base.base.base);		kfree(vram);	}} 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->created) {		virtio_gpu_cmd_unref_resource(vgdev, bo);		virtio_gpu_notify(vgdev);		/* completion handler calls virtio_gpu_cleanup_object() */		return;	}	virtio_gpu_cleanup_object(bo);} static const struct drm_gem_object_funcs virtio_gpu_shmem_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,	.export = virtgpu_gem_prime_export,	.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,}; bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo){	return bo->base.base.funcs == &virtio_gpu_shmem_funcs;} struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,						size_t size){	struct virtio_gpu_object_shmem *shmem;	struct drm_gem_shmem_object *dshmem; 	shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);	if (!shmem)		return NULL; 	dshmem = &shmem->base.base;	dshmem->base.funcs = &virtio_gpu_shmem_funcs;	return &dshmem->base;} static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,					struct virtio_gpu_object *bo,					struct virtio_gpu_mem_entry **ents,					unsigned int *nents){	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);	struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);	struct scatterlist *sg;	int si, ret; 	ret = drm_gem_shmem_pin(&bo->base.base);	if (ret < 0)		return -EINVAL; 	/*	 * virtio_gpu uses drm_gem_shmem_get_sg_table instead of	 * drm_gem_shmem_get_pages_sgt because virtio has it's own set of	 * dma-ops. This is discouraged for other drivers, but should be fine	 * since virtio_gpu doesn't support dma-buf import from other devices.	 */	shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base);	if (!shmem->pages) {		drm_gem_shmem_unpin(&bo->base.base);		return -EINVAL;	} 	if (use_dma_api) {		ret = dma_map_sgtable(vgdev->vdev->dev.parent,				      shmem->pages, DMA_TO_DEVICE, 0);		if (ret)			return ret;		*nents = shmem->mapped = shmem->pages->nents;	} else {		*nents = shmem->pages->orig_nents;	} 	*ents = kvmalloc_array(*nents,			       sizeof(struct virtio_gpu_mem_entry),			       GFP_KERNEL);	if (!(*ents)) {		DRM_ERROR("failed to allocate ent list\n");		return -ENOMEM;	} 	if (use_dma_api) {		for_each_sgtable_dma_sg(shmem->pages, sg, si) {			(*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));			(*ents)[si].length = cpu_to_le32(sg_dma_len(sg));			(*ents)[si].padding = 0;		}	} else {		for_each_sgtable_sg(shmem->pages, sg, si) {			(*ents)[si].addr = cpu_to_le64(sg_phys(sg));			(*ents)[si].length = cpu_to_le32(sg->length);			(*ents)[si].padding = 0;		}	} 	return 0;} 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;	struct virtio_gpu_mem_entry *ents;	unsigned int nents;	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;	} 	ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);	if (ret != 0) {		virtio_gpu_array_put_free(objs);		virtio_gpu_free_object(&shmem_obj->base);		return ret;	} 	if (params->blob) {		virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,						    ents, nents);	} else if (params->virgl) {		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,						  objs, fence);		virtio_gpu_object_attach(vgdev, bo, ents, nents);	} else {		virtio_gpu_cmd_create_resource(vgdev, bo, params,					       objs, fence);		virtio_gpu_object_attach(vgdev, bo, ents, nents);	} 	*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;}