drivers/gpu/drm/virtio/virtgpu_object.c - linux - Git at Google

 /*
  * 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_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;
 }
	/*
	* 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_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;
	}