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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/dma-mapping.h>#include <linux/moduleparam.h>
#include <drm/drm_print.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)) { drm_gem_shmem_free(&bo->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); } else { drm_gem_object_release(&bo->base.base); kfree(bo); }}
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);}
int virtio_gpu_detach_object_fenced(struct virtio_gpu_object *bo){ struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; struct virtio_gpu_fence *fence;
if (!bo->attached) return 0;
fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context, 0); if (!fence) return -ENOMEM;
virtio_gpu_object_detach(vgdev, bo, fence); virtio_gpu_notify(vgdev);
dma_fence_wait(&fence->f, false); dma_fence_put(&fence->f);
return 0;}
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_object_print_info, .export = virtgpu_gem_prime_export, .pin = drm_gem_shmem_object_pin, .unpin = drm_gem_shmem_object_unpin, .get_sg_table = drm_gem_shmem_object_get_sg_table, .vmap = drm_gem_shmem_object_vmap, .vunmap = drm_gem_shmem_object_vunmap, .mmap = drm_gem_shmem_object_mmap, .vm_ops = &drm_gem_shmem_vm_ops,};
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_obj(*shmem); if (!shmem) return ERR_PTR(-ENOMEM);
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 scatterlist *sg; struct sg_table *pages; int si;
pages = drm_gem_shmem_get_pages_sgt(&bo->base); if (IS_ERR(pages)) return PTR_ERR(pages);
if (use_dma_api) *nents = pages->nents; else *nents = pages->orig_nents;
*ents = kvmalloc_objs(struct virtio_gpu_mem_entry, *nents); if (!(*ents)) { DRM_ERROR("failed to allocate ent list\n"); return -ENOMEM; }
if (use_dma_api) { for_each_sgtable_dma_sg(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(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 = NULL; 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;
ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents); if (ret != 0) goto err_put_id;
if (fence) { ret = -ENOMEM; objs = virtio_gpu_array_alloc(1); if (!objs) goto err_free_entry; 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->blob) { if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST) bo->guest_blob = true;
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_free_entry: kvfree(ents);err_put_id: virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);err_free_gem: drm_gem_shmem_free(shmem_obj); return ret;}