OpenCloudOS-Kernel/drivers/gpu/drm/virtio/virtgpu_object.c

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/*
* 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);
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);
}
}
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_sg(vgdev->vdev->dev.parent,
shmem->pages->sgl, shmem->mapped,
DMA_TO_DEVICE);
shmem->mapped = 0;
}
sg_free_table(shmem->pages);
shmem->pages = NULL;
drm_gem_shmem_unpin(&bo->base.base);
}
drm_gem_shmem_free_object(&bo->base.base);
}
}
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,
.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;
dshmem->map_cached = true;
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_iommu_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;
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) {
shmem->mapped = dma_map_sg(vgdev->vdev->dev.parent,
shmem->pages->sgl,
shmem->pages->nents,
DMA_TO_DEVICE);
*nents = shmem->mapped;
} else {
*nents = shmem->pages->nents;
}
*ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry),
GFP_KERNEL);
if (!(*ents)) {
DRM_ERROR("failed to allocate ent list\n");
return -ENOMEM;
}
for_each_sg(shmem->pages->sgl, sg, *nents, si) {
(*ents)[si].addr = cpu_to_le64(use_dma_api
? sg_dma_address(sg)
: 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;
}
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_shmem_init(vgdev, bo, &ents, &nents);
if (ret != 0) {
virtio_gpu_free_object(&shmem_obj->base);
return ret;
}
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;
}