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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jan 2026 07:59:29.3422 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 072b402e-0a61-4027-3c59-08de540c02a3 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000F0E2.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS5PPFD22966BE3 Content-Type: text/plain; charset="utf-8" From: Honglei Huang Add userptr support to enable host direct access to guest userspace memory, eliminating copy overhead for compute workloads. Implementation: - New virtio_gpu_object_userptr type for userptr resources - Pin pages with pin_user_pages_fast() and FOLL_LONGTERM - Build scatter-gather table for host access via blob resource - Support read-only mode (VIRTGPU_BLOB_FLAG_USERPTR_RDONLY) The pages are pinned at resource creation and unpinned at destruction. Follow-up patches will add ioctl integration and feature detection. Signed-off-by: Honglei Huang --- drivers/gpu/drm/virtio/Makefile | 3 +- drivers/gpu/drm/virtio/virtgpu_drv.h | 33 ++++ drivers/gpu/drm/virtio/virtgpu_object.c | 6 + drivers/gpu/drm/virtio/virtgpu_userptr.c | 231 +++++++++++++++++++++++ 4 files changed, 272 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/virtio/virtgpu_userptr.c diff --git a/drivers/gpu/drm/virtio/Makefile b/drivers/gpu/drm/virtio/Makef= ile index d2e1788a8..fe7332a62 100644 --- a/drivers/gpu/drm/virtio/Makefile +++ b/drivers/gpu/drm/virtio/Makefile @@ -6,6 +6,7 @@ virtio-gpu-y :=3D virtgpu_drv.o virtgpu_kms.o virtgpu_gem.o virtgpu_vram.o= \ virtgpu_display.o virtgpu_vq.o \ virtgpu_fence.o virtgpu_object.o virtgpu_debugfs.o virtgpu_plane.o \ - virtgpu_ioctl.o virtgpu_prime.o virtgpu_trace_points.o virtgpu_submit.o + virtgpu_ioctl.o virtgpu_prime.o virtgpu_trace_points.o virtgpu_submit.o \ + virtgpu_userptr.o =20 obj-$(CONFIG_DRM_VIRTIO_GPU) +=3D virtio-gpu.o diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/= virtgpu_drv.h index f17660a71..808a6e65b 100644 --- a/drivers/gpu/drm/virtio/virtgpu_drv.h +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h @@ -84,6 +84,7 @@ struct virtio_gpu_object_params { uint32_t blob_mem; uint32_t blob_flags; uint64_t blob_id; + uint64_t userptr; }; =20 struct virtio_gpu_object { @@ -113,12 +114,38 @@ struct virtio_gpu_object_vram { struct drm_mm_node vram_node; }; =20 +struct virtio_gpu_object_userptr; + +struct virtio_gpu_object_userptr_ops { + int (*get_pages)(struct virtio_gpu_object_userptr *userptr); + void (*put_pages)(struct virtio_gpu_object_userptr *userptr); + void (*release)(struct virtio_gpu_object_userptr *userptr); +}; +struct virtio_gpu_object_userptr { + struct virtio_gpu_object base; + const struct virtio_gpu_object_userptr_ops *ops; + struct mutex lock; + + uint64_t start; + uint32_t npages; + uint32_t bo_handle; + uint32_t flags; + + struct virtio_gpu_device *vgdev; + struct drm_file *file; + struct page **pages; + struct sg_table *sgt; +}; + #define to_virtio_gpu_shmem(virtio_gpu_object) \ container_of((virtio_gpu_object), struct virtio_gpu_object_shmem, base) =20 #define to_virtio_gpu_vram(virtio_gpu_object) \ container_of((virtio_gpu_object), struct virtio_gpu_object_vram, base) =20 +#define to_virtio_gpu_userptr(virtio_gpu_object) \ + container_of((virtio_gpu_object), struct virtio_gpu_object_userptr, base) + struct virtio_gpu_object_array { struct ww_acquire_ctx ticket; struct list_head next; @@ -512,4 +539,10 @@ void virtio_gpu_vram_unmap_dma_buf(struct device *dev, int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data, struct drm_file *file); =20 +/* virtgpu_userptr.c */ +int virtio_gpu_userptr_create(struct virtio_gpu_device *vgdev, + struct drm_file *file, + struct virtio_gpu_object_params *params, + struct virtio_gpu_object **bo_ptr); +bool virtio_gpu_is_userptr(struct virtio_gpu_object *bo); #endif diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virt= io/virtgpu_object.c index e6363c887..da702301b 100644 --- a/drivers/gpu/drm/virtio/virtgpu_object.c +++ b/drivers/gpu/drm/virtio/virtgpu_object.c @@ -80,6 +80,12 @@ void virtio_gpu_cleanup_object(struct virtio_gpu_object = *bo) drm_gem_free_mmap_offset(&vram->base.base.base); drm_gem_object_release(&vram->base.base.base); kfree(vram); + } else if (virtio_gpu_is_userptr(bo)) { + struct virtio_gpu_object_userptr *userptr =3D + to_virtio_gpu_userptr(bo); + + drm_gem_object_release(&userptr->base.base.base); + kfree(userptr); } else { drm_gem_object_release(&bo->base.base); kfree(bo); diff --git a/drivers/gpu/drm/virtio/virtgpu_userptr.c b/drivers/gpu/drm/vir= tio/virtgpu_userptr.c new file mode 100644 index 000000000..f6c211e9d --- /dev/null +++ b/drivers/gpu/drm/virtio/virtgpu_userptr.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include + +#include "virtgpu_drv.h" +#include "drm/drm_gem.h" + +static struct sg_table * +virtio_gpu_userptr_get_sg_table(struct drm_gem_object *obj); + +static void virtio_gpu_userptr_free(struct drm_gem_object *obj) +{ + struct virtio_gpu_object *bo =3D gem_to_virtio_gpu_obj(obj); + struct virtio_gpu_device *vgdev =3D obj->dev->dev_private; + struct virtio_gpu_object_userptr *userptr =3D to_virtio_gpu_userptr(bo); + + if (bo->created) { + userptr->ops->release(userptr); + + virtio_gpu_cmd_unref_resource(vgdev, bo); + virtio_gpu_notify(vgdev); + } + + mutex_destroy(&userptr->lock); +} + +static void virtio_gpu_userptr_object_close(struct drm_gem_object *obj, + struct drm_file *file) +{ + virtio_gpu_gem_object_close(obj, file); +} + +static const struct drm_gem_object_funcs virtio_gpu_userptr_funcs =3D { + .open =3D virtio_gpu_gem_object_open, + .close =3D virtio_gpu_userptr_object_close, + .free =3D virtio_gpu_userptr_free, + .get_sg_table =3D virtio_gpu_userptr_get_sg_table, +}; + +bool virtio_gpu_is_userptr(struct virtio_gpu_object *bo) +{ + return bo->base.base.funcs =3D=3D &virtio_gpu_userptr_funcs; +} + +static int +virtio_gpu_userptr_get_pages(struct virtio_gpu_object_userptr *userptr) +{ + unsigned int flag =3D FOLL_LONGTERM; + unsigned int num_pages, pinned =3D 0; + int ret =3D 0; + + if (userptr->pages) + return 0; + + userptr->pages =3D kvmalloc_array(userptr->npages, sizeof(struct page *), + GFP_KERNEL); + if (!userptr->pages) + return -ENOMEM; + + if (!(userptr->flags & VIRTGPU_BLOB_FLAG_USERPTR_RDONLY)) + flag |=3D FOLL_WRITE; + + do { + num_pages =3D userptr->npages - pinned; + + ret =3D pin_user_pages_fast(userptr->start + pinned * PAGE_SIZE, + num_pages, flag, + userptr->pages + pinned); + + if (ret < 0) { + if (pinned) + unpin_user_pages(userptr->pages, pinned); + kvfree(userptr->pages); + return ret; + } + + pinned +=3D ret; + + } while (pinned < userptr->npages); + + return 0; +} + +static void +virtio_gpu_userptr_put_pages(struct virtio_gpu_object_userptr *userptr) +{ + if (userptr->pages) { + unpin_user_pages(userptr->pages, userptr->npages); + kvfree(userptr->pages); + userptr->pages =3D NULL; + } + + if (userptr->sgt) { + sg_free_table(userptr->sgt); + kfree(userptr->sgt); + userptr->sgt =3D NULL; + } +} + +static void +virtio_gpu_userptr_release(struct virtio_gpu_object_userptr *userptr) +{ + mutex_lock(&userptr->lock); + userptr->ops->put_pages(userptr); + mutex_unlock(&userptr->lock); +} + +static struct sg_table * +virtio_gpu_userptr_get_sg_table(struct drm_gem_object *obj) +{ + struct virtio_gpu_object *bo =3D gem_to_virtio_gpu_obj(obj); + struct virtio_gpu_object_userptr *userptr =3D to_virtio_gpu_userptr(bo); + int ret; + + mutex_lock(&userptr->lock); + if (!userptr->pages) { + ret =3D userptr->ops->get_pages(userptr); + if (ret) { + mutex_unlock(&userptr->lock); + return ERR_PTR(ret); + } + } + + if (!userptr->sgt) + userptr->sgt =3D drm_prime_pages_to_sg(NULL, userptr->pages, + userptr->npages); + mutex_unlock(&userptr->lock); + + return userptr->sgt; +} + +static int +virtio_gpu_userptr_init(struct drm_device *dev, struct drm_file *file, + struct virtio_gpu_object_userptr *userptr, + struct virtio_gpu_object_params *params, + const struct virtio_gpu_object_userptr_ops *ops) +{ + uint32_t page_offset; + uint64_t aligned_size; + uint64_t aligned_addr; + int ret; + struct drm_gem_object *obj; + + page_offset =3D params->userptr & (PAGE_SIZE - 1UL); + aligned_addr =3D params->userptr - page_offset; + aligned_size =3D roundup(page_offset + params->size, PAGE_SIZE); + + userptr->start =3D aligned_addr; + userptr->npages =3D aligned_size >> PAGE_SHIFT; + userptr->flags =3D params->blob_flags; + + mutex_init(&userptr->lock); + userptr->vgdev =3D dev->dev_private; + userptr->file =3D file; + userptr->ops =3D ops; + + obj =3D &userptr->base.base.base; + obj->funcs =3D &virtio_gpu_userptr_funcs; + + drm_gem_private_object_init(dev, obj, aligned_size); + + ret =3D virtio_gpu_resource_id_get(userptr->vgdev, + &userptr->base.hw_res_handle); + + return ret; +} + +static const struct virtio_gpu_object_userptr_ops virtio_gpu_userptr_ops = =3D { + .get_pages =3D virtio_gpu_userptr_get_pages, + .put_pages =3D virtio_gpu_userptr_put_pages, + .release =3D virtio_gpu_userptr_release, +}; + +int virtio_gpu_userptr_create(struct virtio_gpu_device *vgdev, + struct drm_file *file, + struct virtio_gpu_object_params *params, + struct virtio_gpu_object **bo_ptr) +{ + struct virtio_gpu_object_userptr *userptr; + int ret, si; + struct sg_table *sgt; + struct scatterlist *sg; + struct virtio_gpu_mem_entry *ents; + + if (!params->size) + return -EINVAL; + + if (!access_ok((char __user *)(unsigned long)params->userptr, + params->size)) + return -EFAULT; + + userptr =3D kzalloc(sizeof(*userptr), GFP_KERNEL); + if (!userptr) + return -ENOMEM; + + ret =3D virtio_gpu_userptr_init(vgdev->ddev, file, userptr, params, + &virtio_gpu_userptr_ops); + if (ret) + goto failed_free; + + sgt =3D virtio_gpu_userptr_get_sg_table(&userptr->base.base.base); + if (IS_ERR(sgt)) { + ret =3D PTR_ERR(sgt); + goto failed_free; + } + + ents =3D kvmalloc_array(sgt->nents, sizeof(struct virtio_gpu_mem_entry), + GFP_KERNEL); + if (!ents) { + ret =3D -ENOMEM; + goto failed_free; + } + + for_each_sgtable_sg(sgt, sg, si) { + (ents)[si].addr =3D cpu_to_le64(sg_phys(sg)); + (ents)[si].length =3D cpu_to_le32(sg->length); + (ents)[si].padding =3D 0; + } + + virtio_gpu_cmd_resource_create_blob(vgdev, &userptr->base, params, ents, + sgt->nents); + + *bo_ptr =3D &userptr->base; + return 0; + +failed_free: + kfree(userptr); + return ret; +} --=20 2.34.1