On 10/26/26 06:36, Alistair Popple wrote:

From: Jason Gunthorpe jgg@nvidia.com

This attach function always creates a SGT mapping type importer.

Yeah that is a clear NO-GO. The attachment should be the same for the new interface as well.

Regards, Christian.

Signed-off-by: Jason Gunthorpe jgg@nvidia.com

Documentation/gpu/todo.rst | 2 +- drivers/accel/amdxdna/amdxdna_gem.c | 2 +- drivers/accel/ivpu/ivpu_gem.c | 2 +- drivers/accel/qaic/qaic_data.c | 2 +- drivers/dma-buf/dma-buf.c | 14 +++++++------- drivers/gpu/drm/armada/armada_gem.c | 2 +- drivers/gpu/drm/drm_gem_shmem_helper.c | 2 +- drivers/gpu/drm/drm_prime.c | 2 +- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 2 +- .../gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c | 2 +- drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 2 +- drivers/gpu/drm/tegra/gem.c | 4 ++-- drivers/iio/industrialio-buffer.c | 2 +- .../media/common/videobuf2/videobuf2-dma-contig.c | 2 +- drivers/media/common/videobuf2/videobuf2-dma-sg.c | 2 +- .../media/platform/nvidia/tegra-vde/dmabuf-cache.c | 2 +- drivers/misc/fastrpc.c | 2 +- drivers/usb/gadget/function/f_fs.c | 2 +- drivers/xen/gntdev-dmabuf.c | 2 +- include/linux/dma-buf.h | 10 +++++----- io_uring/zcrx.c | 2 +- net/core/devmem.c | 2 +- 22 files changed, 33 insertions(+), 33 deletions(-)

diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index 14cf37590fc7..be0397c197f1 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -633,7 +633,7 @@ Remove automatic page mapping from dma-buf importing When importing dma-bufs, the dma-buf and PRIME frameworks automatically map imported pages into the importer's DMA area. drm_gem_prime_fd_to_handle() and -drm_gem_prime_handle_to_fd() require that importers call dma_buf_attach() +drm_gem_prime_handle_to_fd() require that importers call dma_buf_sgt_attach() even if they never do actual device DMA, but only CPU access through dma_buf_vmap(). This is a problem for USB devices, which do not support DMA operations. diff --git a/drivers/accel/amdxdna/amdxdna_gem.c b/drivers/accel/amdxdna/amdxdna_gem.c index a7e759bb0460..2b2f1e9fb9ec 100644 --- a/drivers/accel/amdxdna/amdxdna_gem.c +++ b/drivers/accel/amdxdna/amdxdna_gem.c @@ -893,7 +893,7 @@ amdxdna_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf) get_dma_buf(dma_buf);

• attach = dma_buf_attach(dma_buf, dev->dev);

• attach = dma_buf_sgt_attach(dma_buf, dev->dev); if (IS_ERR(attach)) { ret = PTR_ERR(attach); goto put_buf;

diff --git a/drivers/accel/ivpu/ivpu_gem.c b/drivers/accel/ivpu/ivpu_gem.c index 8d6ed95ccc7c..d1c99b974a34 100644 --- a/drivers/accel/ivpu/ivpu_gem.c +++ b/drivers/accel/ivpu/ivpu_gem.c @@ -219,7 +219,7 @@ struct drm_gem_object *ivpu_gem_prime_import(struct drm_device *dev, struct ivpu_bo *bo; int ret;

• attach = dma_buf_attach(dma_buf, attach_dev);

• attach = dma_buf_sgt_attach(dma_buf, attach_dev); if (IS_ERR(attach)) return ERR_CAST(attach);

diff --git a/drivers/accel/qaic/qaic_data.c b/drivers/accel/qaic/qaic_data.c index 92d49448df72..88331028b7bf 100644 --- a/drivers/accel/qaic/qaic_data.c +++ b/drivers/accel/qaic/qaic_data.c @@ -850,7 +850,7 @@ struct drm_gem_object *qaic_gem_prime_import(struct drm_device *dev, struct dma_ obj = &bo->base; get_dma_buf(dma_buf);

• attach = dma_buf_attach(dma_buf, dev->dev);

• attach = dma_buf_sgt_attach(dma_buf, dev->dev); if (IS_ERR(attach)) { ret = PTR_ERR(attach); goto attach_fail;

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 12604c60122e..06bc25eff079 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -671,7 +671,7 @@ static struct file *dma_buf_getfile(size_t size, int flags)

• 2. Userspace passes this file-descriptors to all drivers it wants this buffer
• to share with: First the file descriptor is converted to a &dma_buf using
• dma_buf_get(). Then the buffer is attached to the device using

• • dma_buf_attach().

• • dma_buf_sgt_attach().
  • Up to this stage the exporter is still free to migrate or reallocate the
  • backing storage.

@@ -966,7 +966,7 @@ dma_buf_pin_on_map(struct dma_buf_attachment *attach)

• 2. Importers must not hold the dma-buf reservation lock when calling these
• functions:

• • - dma_buf_attach()
    

• • - dma_buf_sgt_attach()
    

  • - dma_buf_dynamic_attach()
    

  • - dma_buf_detach()
    

  • - dma_buf_export()
    

@@ -1100,15 +1100,15 @@ struct dma_buf_attachment *dma_buf_mapping_attach( EXPORT_SYMBOL_NS_GPL(dma_buf_mapping_attach, "DMA_BUF"); /**

• • dma_buf_attach - Wrapper for dma_buf_mapping_attach

• • dma_buf_sgt_attach - Wrapper for dma_buf_mapping_attach
  • @dmabuf: [in] buffer to attach device to.
  • @dev: [in] device to be attached.
  • Wrapper to call dma_buf_mapping_attach() for drivers which still use a static
  • mapping.
  */

-struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,

• 			  struct device *dev)
  

+struct dma_buf_attachment *dma_buf_sgt_attach(struct dma_buf *dmabuf,

• 			      struct device *dev)
  

{ struct dma_buf_mapping_match sgt_match[] = { DMA_BUF_IMAPPING_SGT(dev, DMA_SGT_NO_P2P), @@ -1117,7 +1117,7 @@ struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, return dma_buf_mapping_attach(dmabuf, sgt_match, ARRAY_SIZE(sgt_match), NULL, NULL); } -EXPORT_SYMBOL_NS_GPL(dma_buf_attach, "DMA_BUF"); +EXPORT_SYMBOL_NS_GPL(dma_buf_sgt_attach, "DMA_BUF"); /**

• dma_buf_dynamic_attach - Add the device to dma_buf's attachments list

@@ -1149,7 +1149,7 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_dynamic_attach, "DMA_BUF");

• @dmabuf: [in] buffer to detach from.
• @attach: [in] attachment to be detached; is free'd after this call.

• • Clean up a device attachment obtained by calling dma_buf_attach().

• • Clean up a device attachment obtained by calling dma_buf_sgt_attach().
  • Optionally this calls &dma_buf_ops.detach for device-specific detach.
  */

diff --git a/drivers/gpu/drm/armada/armada_gem.c b/drivers/gpu/drm/armada/armada_gem.c index 72c7cd2b3fb9..438f33304eab 100644 --- a/drivers/gpu/drm/armada/armada_gem.c +++ b/drivers/gpu/drm/armada/armada_gem.c @@ -518,7 +518,7 @@ armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf) } }

• attach = dma_buf_attach(buf, dev->dev);

• attach = dma_buf_sgt_attach(buf, dev->dev); if (IS_ERR(attach)) return ERR_CAST(attach);

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index d654a22a30de..9e937af2ee73 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -964,7 +964,7 @@ struct drm_gem_object *drm_gem_shmem_prime_import_no_map(struct drm_device *dev, return obj; }

• attach = dma_buf_attach(dma_buf, dev->dev);

• attach = dma_buf_sgt_attach(dma_buf, dev->dev); if (IS_ERR(attach)) return ERR_CAST(attach);

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 3ffbe3d28929..3084e8c28e53 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -999,7 +999,7 @@ struct drm_gem_object *drm_gem_prime_import_dev(struct drm_device *dev, if (!dev->driver->gem_prime_import_sg_table) return ERR_PTR(-EINVAL);

• attach = dma_buf_attach(dma_buf, attach_dev);

• attach = dma_buf_sgt_attach(dma_buf, attach_dev); if (IS_ERR(attach)) return ERR_CAST(attach);

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index 7f939c281308..9865a7a9ad8f 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -306,7 +306,7 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, return ERR_PTR(-E2BIG); /* need to attach */

• attach = dma_buf_attach(dma_buf, dev->dev);

• attach = dma_buf_sgt_attach(dma_buf, dev->dev); if (IS_ERR(attach)) return ERR_CAST(attach);

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c index 6b6d235fd3e9..3c193e6d9d11 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c @@ -287,7 +287,7 @@ static int igt_dmabuf_import_same_driver(struct drm_i915_private *i915, goto out_import; /* Now try a fake an importer */

• import_attach = dma_buf_attach(dmabuf, obj->base.dev->dev);

• import_attach = dma_buf_sgt_attach(dmabuf, obj->base.dev->dev); if (IS_ERR(import_attach)) { err = PTR_ERR(import_attach); goto out_import;

diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c index c549b94b2e8a..ca0962a99509 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c @@ -115,7 +115,7 @@ struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev, } }

• attach = dma_buf_attach(dma_buf, dev->dev);

• attach = dma_buf_sgt_attach(dma_buf, dev->dev); if (IS_ERR(attach)) return ERR_CAST(attach);

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c index f06826fe8366..803409824711 100644 --- a/drivers/gpu/drm/tegra/gem.c +++ b/drivers/gpu/drm/tegra/gem.c @@ -81,7 +81,7 @@ static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_ if (obj->dma_buf) { struct dma_buf *buf = obj->dma_buf;

• map->attach = dma_buf_attach(buf, dev);
  

• map->attach = dma_buf_sgt_attach(buf, dev);
  

  if (IS_ERR(map->attach)) { err = PTR_ERR(map->attach); goto free;

@@ -475,7 +475,7 @@ static struct tegra_bo *tegra_bo_import(struct drm_device *drm, * domain, map it first to the DRM device to get an sgt. */ if (tegra->domain) {

• attach = dma_buf_attach(buf, drm->dev);
  

• attach = dma_buf_sgt_attach(buf, drm->dev);
  

  if (IS_ERR(attach)) { err = PTR_ERR(attach); goto free;

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index f81154642bcd..abffbcc76c4c 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -1717,7 +1717,7 @@ static int iio_buffer_attach_dmabuf(struct iio_dev_buffer_pair *ib, goto err_free_priv; }

• attach = dma_buf_attach(dmabuf, dma_dev);

• attach = dma_buf_sgt_attach(dmabuf, dma_dev); if (IS_ERR(attach)) { err = PTR_ERR(attach); goto err_dmabuf_put;

diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c index e13521b5c0e8..c7fa86cba8ad 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c @@ -789,7 +789,7 @@ static void *vb2_dc_attach_dmabuf(struct vb2_buffer *vb, struct device *dev, buf->vb = vb; /* create attachment for the dmabuf with the user device */

• dba = dma_buf_attach(dbuf, buf->dev);

• dba = dma_buf_sgt_attach(dbuf, buf->dev); if (IS_ERR(dba)) { pr_err("failed to attach dmabuf\n"); kfree(buf);

diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c index 59e346a5d48b..4c93b7f58e1f 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c @@ -638,7 +638,7 @@ static void *vb2_dma_sg_attach_dmabuf(struct vb2_buffer *vb, struct device *dev, buf->dev = dev; /* create attachment for the dmabuf with the user device */

• dba = dma_buf_attach(dbuf, buf->dev);

• dba = dma_buf_sgt_attach(dbuf, buf->dev); if (IS_ERR(dba)) { pr_err("failed to attach dmabuf\n"); kfree(buf);

diff --git a/drivers/media/platform/nvidia/tegra-vde/dmabuf-cache.c b/drivers/media/platform/nvidia/tegra-vde/dmabuf-cache.c index 55d58a4dbbe2..d80282ebe4b4 100644 --- a/drivers/media/platform/nvidia/tegra-vde/dmabuf-cache.c +++ b/drivers/media/platform/nvidia/tegra-vde/dmabuf-cache.c @@ -96,7 +96,7 @@ int tegra_vde_dmabuf_cache_map(struct tegra_vde *vde, goto ref; }

• attachment = dma_buf_attach(dmabuf, dev);

• attachment = dma_buf_sgt_attach(dmabuf, dev); if (IS_ERR(attachment)) { dev_err(dev, "Failed to attach dmabuf\n"); err = PTR_ERR(attachment);

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 375ce39c78c9..24ae1038b634 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -904,7 +904,7 @@ static int fastrpc_map_attach(struct fastrpc_user *fl, int fd, goto get_err; }

• map->attach = dma_buf_attach(map->buf, sess->dev);

• map->attach = dma_buf_sgt_attach(map->buf, sess->dev); if (IS_ERR(map->attach)) { dev_err(sess->dev, "Failed to attach dmabuf\n"); err = PTR_ERR(map->attach);

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index 4016edfa4c02..bfa24bcfe84c 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -1549,7 +1549,7 @@ static int ffs_dmabuf_attach(struct file *file, int fd) if (IS_ERR(dmabuf)) return PTR_ERR(dmabuf);

• attach = dma_buf_attach(dmabuf, gadget->dev.parent);

• attach = dma_buf_sgt_attach(dmabuf, gadget->dev.parent); if (IS_ERR(attach)) { err = PTR_ERR(attach); goto err_dmabuf_put;

diff --git a/drivers/xen/gntdev-dmabuf.c b/drivers/xen/gntdev-dmabuf.c index cd851eb04a69..e7ffb546e717 100644 --- a/drivers/xen/gntdev-dmabuf.c +++ b/drivers/xen/gntdev-dmabuf.c @@ -580,7 +580,7 @@ dmabuf_imp_to_refs(struct gntdev_dmabuf_priv *priv, struct device *dev, gntdev_dmabuf->priv = priv; gntdev_dmabuf->fd = fd;

• attach = dma_buf_attach(dma_buf, dev);

• attach = dma_buf_sgt_attach(dma_buf, dev); if (IS_ERR(attach)) { ret = ERR_CAST(attach); goto fail_free_obj;

diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index b264e1c4a9df..208752eb93d9 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -77,7 +77,7 @@ struct dma_buf_ops { /** * @attach: *

• * This is called from dma_buf_attach() to make sure that a given
  

• * This is called from dma_buf_sgt_attach() to make sure that a given
  

  • &dma_buf_attachment.dev can access the provided &dma_buf. Exporters
  • which support buffer objects in special locations like VRAM or
  • device-specific carveout areas should check whether the buffer could

@@ -125,7 +125,7 @@ struct dma_buf_ops { * exclusive with @cache_sgt_mapping. * * This is called automatically for non-dynamic importers from

• * dma_buf_attach().
  

• * dma_buf_sgt_attach().
  

  • Note that similar to non-dynamic exporters in their @map_dma_buf
  • callback the driver must guarantee that the memory is available for

@@ -513,7 +513,7 @@ struct dma_buf_attach_ops {

• and its user device(s). The list contains one attachment struct per device
• attached to the buffer.

• • An attachment is created by calling dma_buf_attach(), and released again by

• • An attachment is created by calling dma_buf_sgt_attach(), and released again by
  • calling dma_buf_detach(). The DMA mapping itself needed to initiate a
  • transfer is created by dma_buf_sgt_map_attachment() and freed again by calling
  • dma_buf_sgt_unmap_attachment().

@@ -591,8 +591,8 @@ static inline bool dma_buf_is_dynamic(struct dma_buf *dmabuf) return !!dmabuf->ops->pin; } -struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,

• 			  struct device *dev);
  

+struct dma_buf_attachment *dma_buf_sgt_attach(struct dma_buf *dmabuf,

• 			      struct device *dev);
  

struct dma_buf_attachment * dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev, const struct dma_buf_attach_ops *importer_ops, diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c index 67f74ce4f096..2cbf65b29f89 100644 --- a/io_uring/zcrx.c +++ b/io_uring/zcrx.c @@ -175,7 +175,7 @@ static int io_import_dmabuf(struct io_zcrx_ifq *ifq, goto err; }

• mem->attach = dma_buf_attach(mem->dmabuf, ifq->dev);

• mem->attach = dma_buf_sgt_attach(mem->dmabuf, ifq->dev); if (IS_ERR(mem->attach)) { ret = PTR_ERR(mem->attach); mem->attach = NULL;

diff --git a/net/core/devmem.c b/net/core/devmem.c index f30fa375c9ab..d7c08da306cf 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -234,7 +234,7 @@ net_devmem_bind_dmabuf(struct net_device *dev, void *vdev, binding->dmabuf = dmabuf; binding->direction = direction;

• binding->attachment = dma_buf_attach(binding->dmabuf, dma_dev);

• binding->attachment = dma_buf_sgt_attach(binding->dmabuf, dma_dev); if (IS_ERR(binding->attachment)) { err = PTR_ERR(binding->attachment); NL_SET_ERR_MSG(extack, "Failed to bind dmabuf to device");