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// SPDX-License-Identifier: GPL-2.0
#include "virtgpu_drv.h"
#include <linux/dma-mapping.h>
static void virtio_gpu_vram_free(struct drm_gem_object *obj)
{
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
struct virtio_gpu_device *vgdev = obj->dev->dev_private;
struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
bool unmap;
if (bo->created) {
spin_lock(&vgdev->host_visible_lock);
unmap = drm_mm_node_allocated(&vram->vram_node);
spin_unlock(&vgdev->host_visible_lock);
if (unmap)
virtio_gpu_cmd_unmap(vgdev, bo);
virtio_gpu_cmd_unref_resource(vgdev, bo);
virtio_gpu_notify(vgdev);
return;
}
}
static const struct vm_operations_struct virtio_gpu_vram_vm_ops = {
.open = drm_gem_vm_open,
.close = drm_gem_vm_close,
};
static int virtio_gpu_vram_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
int ret;
struct virtio_gpu_device *vgdev = obj->dev->dev_private;
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
unsigned long vm_size = vma->vm_end - vma->vm_start;
if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE))
return -EINVAL;
wait_event(vgdev->resp_wq, vram->map_state != STATE_INITIALIZING);
if (vram->map_state != STATE_OK)
return -EINVAL;
vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
vma->vm_ops = &virtio_gpu_vram_vm_ops;
if (vram->map_info == VIRTIO_GPU_MAP_CACHE_WC)
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
else if (vram->map_info == VIRTIO_GPU_MAP_CACHE_UNCACHED)
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
/* Partial mappings of GEM buffers don't happen much in practice. */
if (vm_size != vram->vram_node.size)
return -EINVAL;
ret = io_remap_pfn_range(vma, vma->vm_start,
vram->vram_node.start >> PAGE_SHIFT,
vm_size, vma->vm_page_prot);
return ret;
}
struct sg_table *virtio_gpu_vram_map_dma_buf(struct virtio_gpu_object *bo,
struct device *dev,
enum dma_data_direction dir)
{
struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
struct sg_table *sgt;
dma_addr_t addr;
int ret;
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return ERR_PTR(-ENOMEM);
if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE)) {
// Virtio devices can access the dma-buf via its UUID. Return a stub
// sg_table so the dma-buf API still works.
if (!is_virtio_device(dev) || !vgdev->has_resource_assign_uuid) {
ret = -EIO;
goto out;
}
return sgt;
}
ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
if (ret)
goto out;
addr = dma_map_resource(dev, vram->vram_node.start,
vram->vram_node.size, dir,
DMA_ATTR_SKIP_CPU_SYNC);
ret = dma_mapping_error(dev, addr);
if (ret)
goto out;
sg_set_page(sgt->sgl, NULL, vram->vram_node.size, 0);
sg_dma_address(sgt->sgl) = addr;
sg_dma_len(sgt->sgl) = vram->vram_node.size;
return sgt;
out:
sg_free_table(sgt);
kfree(sgt);
return ERR_PTR(ret);
}
void virtio_gpu_vram_unmap_dma_buf(struct device *dev,
struct sg_table *sgt,
enum dma_data_direction dir)
{
if (sgt->nents) {
dma_unmap_resource(dev, sg_dma_address(sgt->sgl),
sg_dma_len(sgt->sgl), dir,
DMA_ATTR_SKIP_CPU_SYNC);
}
sg_free_table(sgt);
kfree(sgt);
}
static const struct drm_gem_object_funcs virtio_gpu_vram_funcs = {
.open = virtio_gpu_gem_object_open,
.close = virtio_gpu_gem_object_close,
.free = virtio_gpu_vram_free,
.mmap = virtio_gpu_vram_mmap,
.export = virtgpu_gem_prime_export,
};
bool virtio_gpu_is_vram(struct virtio_gpu_object *bo)
{
return bo->base.base.funcs == &virtio_gpu_vram_funcs;
}
static int virtio_gpu_vram_map(struct virtio_gpu_object *bo)
{
int ret;
uint64_t offset;
struct virtio_gpu_object_array *objs;
struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
if (!vgdev->has_host_visible)
return -EINVAL;
spin_lock(&vgdev->host_visible_lock);
ret = drm_mm_insert_node(&vgdev->host_visible_mm, &vram->vram_node,
bo->base.base.size);
spin_unlock(&vgdev->host_visible_lock);
if (ret)
return ret;
objs = virtio_gpu_array_alloc(1);
if (!objs) {
ret = -ENOMEM;
goto err_remove_node;
}
virtio_gpu_array_add_obj(objs, &bo->base.base);
/*TODO: Add an error checking helper function in drm_mm.h */
offset = vram->vram_node.start - vgdev->host_visible_region.addr;
ret = virtio_gpu_cmd_map(vgdev, objs, offset);
if (ret) {
virtio_gpu_array_put_free(objs);
goto err_remove_node;
}
return 0;
err_remove_node:
spin_lock(&vgdev->host_visible_lock);
drm_mm_remove_node(&vram->vram_node);
spin_unlock(&vgdev->host_visible_lock);
return ret;
}
int virtio_gpu_vram_create(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object_params *params,
struct virtio_gpu_object **bo_ptr)
{
struct drm_gem_object *obj;
struct virtio_gpu_object_vram *vram;
int ret;
vram = kzalloc(sizeof(*vram), GFP_KERNEL);
if (!vram)
return -ENOMEM;
obj = &vram->base.base.base;
obj->funcs = &virtio_gpu_vram_funcs;
params->size = PAGE_ALIGN(params->size);
drm_gem_private_object_init(vgdev->ddev, obj, params->size);
/* Create fake offset */
ret = drm_gem_create_mmap_offset(obj);
if (ret) {
kfree(vram);
return ret;
}
ret = virtio_gpu_resource_id_get(vgdev, &vram->base.hw_res_handle);
if (ret) {
kfree(vram);
return ret;
}
virtio_gpu_cmd_resource_create_blob(vgdev, &vram->base, params, NULL,
0);
if (params->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE) {
ret = virtio_gpu_vram_map(&vram->base);
if (ret) {
virtio_gpu_vram_free(obj);
return ret;
}
}
*bo_ptr = &vram->base;
return 0;
}
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