On 5/18/26 17:57, Lizhi Hou wrote:
> Ubuf pages should not be mmaped or exported. Remove the ubuf mmap callback
> and return -EOPNOTSUPP when exporting ubuf objects.
>
> ubuf vmap is also removed for there is not a real use case yet.
>
> Fixes: bd72d4acda10 ("accel/amdxdna: Support user space allocated buffer")
> Cc: Christian Koenig <[email protected]>
> Signed-off-by: Lizhi Hou <[email protected]>
Reviewed-by: Christian König <[email protected]>
> ---
> v2:
> Remove dead code amdxdna_ubuf_vm_ops structure and amdxdna_ubuf_vm_fault
> function.
> Rename Non-exportable buffer flag from 'pri' to 'private_buffer'
>
> drivers/accel/amdxdna/amdxdna_gem.c | 9 ++++-
> drivers/accel/amdxdna/amdxdna_gem.h | 2 ++
> drivers/accel/amdxdna/amdxdna_ubuf.c | 50 ----------------------------
> 3 files changed, 10 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/accel/amdxdna/amdxdna_gem.c
> b/drivers/accel/amdxdna/amdxdna_gem.c
> index 319d2064fafa..6b9b556de555 100644
> --- a/drivers/accel/amdxdna/amdxdna_gem.c
> +++ b/drivers/accel/amdxdna/amdxdna_gem.c
> @@ -492,6 +492,9 @@ static struct dma_buf *amdxdna_gem_prime_export(struct
> drm_gem_object *gobj, int
> struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);
> DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
>
> + if (abo->private_buffer)
> + return ERR_PTR(-EOPNOTSUPP);
> +
> if (abo->dma_buf) {
> get_dma_buf(abo->dma_buf);
> return abo->dma_buf;
> @@ -716,6 +719,7 @@ amdxdna_gem_create_ubuf_object(struct drm_device *dev,
> struct amdxdna_drm_create
> {
> struct amdxdna_dev *xdna = to_xdna_dev(dev);
> struct amdxdna_drm_va_tbl va_tbl;
> + struct amdxdna_gem_obj *abo;
> struct drm_gem_object *gobj;
> struct dma_buf *dma_buf;
>
> @@ -742,7 +746,10 @@ amdxdna_gem_create_ubuf_object(struct drm_device *dev,
> struct amdxdna_drm_create
>
> dma_buf_put(dma_buf);
>
> - return to_xdna_obj(gobj);
> + abo = to_xdna_obj(gobj);
> + abo->private_buffer = true;
> +
> + return abo;
> }
>
> static struct amdxdna_gem_obj *
> diff --git a/drivers/accel/amdxdna/amdxdna_gem.h
> b/drivers/accel/amdxdna/amdxdna_gem.h
> index 4fc48a1189d2..957305ccb485 100644
> --- a/drivers/accel/amdxdna/amdxdna_gem.h
> +++ b/drivers/accel/amdxdna/amdxdna_gem.h
> @@ -54,6 +54,8 @@ struct amdxdna_gem_obj {
>
> /* True, if BO is managed by XRT, not application */
> bool internal;
> + /* True, if BO is not exportable */
> + bool private_buffer;
> };
>
> #define to_gobj(obj) (&(obj)->base.base)
> diff --git a/drivers/accel/amdxdna/amdxdna_ubuf.c
> b/drivers/accel/amdxdna/amdxdna_ubuf.c
> index 3769210c55cc..bb60fb80467e 100644
> --- a/drivers/accel/amdxdna/amdxdna_ubuf.c
> +++ b/drivers/accel/amdxdna/amdxdna_ubuf.c
> @@ -69,60 +69,10 @@ static void amdxdna_ubuf_release(struct dma_buf *dbuf)
> kfree(ubuf);
> }
>
> -static vm_fault_t amdxdna_ubuf_vm_fault(struct vm_fault *vmf)
> -{
> - struct vm_area_struct *vma = vmf->vma;
> - struct amdxdna_ubuf_priv *ubuf;
> - unsigned long pfn;
> - pgoff_t pgoff;
> -
> - ubuf = vma->vm_private_data;
> - pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
> -
> - pfn = page_to_pfn(ubuf->pages[pgoff]);
> - return vmf_insert_pfn(vma, vmf->address, pfn);
> -}
> -
> -static const struct vm_operations_struct amdxdna_ubuf_vm_ops = {
> - .fault = amdxdna_ubuf_vm_fault,
> -};
> -
> -static int amdxdna_ubuf_mmap(struct dma_buf *dbuf, struct vm_area_struct
> *vma)
> -{
> - struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
> -
> - vma->vm_ops = &amdxdna_ubuf_vm_ops;
> - vma->vm_private_data = ubuf;
> - vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
> -
> - return 0;
> -}
> -
> -static int amdxdna_ubuf_vmap(struct dma_buf *dbuf, struct iosys_map *map)
> -{
> - struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
> - void *kva;
> -
> - kva = vmap(ubuf->pages, ubuf->nr_pages, VM_MAP, PAGE_KERNEL);
> - if (!kva)
> - return -EINVAL;
> -
> - iosys_map_set_vaddr(map, kva);
> - return 0;
> -}
> -
> -static void amdxdna_ubuf_vunmap(struct dma_buf *dbuf, struct iosys_map *map)
> -{
> - vunmap(map->vaddr);
> -}
> -
> static const struct dma_buf_ops amdxdna_ubuf_dmabuf_ops = {
> .map_dma_buf = amdxdna_ubuf_map,
> .unmap_dma_buf = amdxdna_ubuf_unmap,
> .release = amdxdna_ubuf_release,
> - .mmap = amdxdna_ubuf_mmap,
> - .vmap = amdxdna_ubuf_vmap,
> - .vunmap = amdxdna_ubuf_vunmap,
> };
>
> static int readonly_va_entry(struct amdxdna_drm_va_entry *va_ent)
