On 5/15/26 17:53, 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 christian.koenig@amd.com Signed-off-by: Lizhi Hou lizhi.hou@amd.com

---

drivers/accel/amdxdna/amdxdna_gem.c | 9 +++++++- drivers/accel/amdxdna/amdxdna_gem.h | 2 ++ drivers/accel/amdxdna/amdxdna_ubuf.c | 32 ---------------------------- 3 files changed, 10 insertions(+), 33 deletions(-)

diff --git a/drivers/accel/amdxdna/amdxdna_gem.c b/drivers/accel/amdxdna/amdxdna_gem.c index 319d2064fafa..6087264ba1b5 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->pri)

• 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->pri = 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..162e5499f5e0 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 pri;

That member name could be improved.

}; #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..df4ab225fbf9 100644 --- a/drivers/accel/amdxdna/amdxdna_ubuf.c +++ b/drivers/accel/amdxdna/amdxdna_ubuf.c @@ -87,42 +87,10 @@ static const struct vm_operations_struct amdxdna_ubuf_vm_ops = { .fault = amdxdna_ubuf_vm_fault, };

As pointed out by the kernel test robot the amdxdna_ubuf_vm_ops structure and amdxdna_ubuf_vm_fault function is now dead code, please remove as well.

Apart from that looks good to me, Christian.

-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)