Message-ID: <345b8dcb-5015-4801-b263-0dca4d1b3fca@amd.com>
Date: Mon, 19 Jan 2026 11:22:27 +0100
From: Christian König <christian.koenig@....com>
To: Leon Romanovsky <leon@...nel.org>, Sumit Semwal
 <sumit.semwal@...aro.org>, Alex Deucher <alexander.deucher@....com>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Gerd Hoffmann <kraxel@...hat.com>,
 Dmitry Osipenko <dmitry.osipenko@...labora.com>,
 Gurchetan Singh <gurchetansingh@...omium.org>, Chia-I Wu
 <olvaffe@...il.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Lucas De Marchi <lucas.demarchi@...el.com>,
 Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>, Jason Gunthorpe <jgg@...pe.ca>,
 Kevin Tian <kevin.tian@...el.com>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Alex Williamson <alex@...zbot.org>
Cc: linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
 amd-gfx@...ts.freedesktop.org, virtualization@...ts.linux.dev,
 intel-xe@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
 iommu@...ts.linux.dev, kvm@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dma-buf: Rename .move_notify() callback to a
 clearer identifier

On 1/18/26 13:08, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> Rename the .move_notify() callback to .invalidate_mappings() to make its
> purpose explicit and highlight that it is responsible for invalidating
> existing mappings.
> 
> Suggested-by: Christian König <christian.koenig@....com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>

Reviewed-by: Christian König <christian.koenig@....com>

> ---
>  drivers/dma-buf/dma-buf.c                   | 6 +++---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 4 ++--
>  drivers/gpu/drm/virtio/virtgpu_prime.c      | 2 +-
>  drivers/gpu/drm/xe/tests/xe_dma_buf.c       | 6 +++---
>  drivers/gpu/drm/xe/xe_dma_buf.c             | 2 +-
>  drivers/infiniband/core/umem_dmabuf.c       | 4 ++--
>  drivers/infiniband/hw/mlx5/mr.c             | 2 +-
>  drivers/iommu/iommufd/pages.c               | 2 +-
>  include/linux/dma-buf.h                     | 6 +++---
>  9 files changed, 17 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> index edaa9e4ee4ae..59cc647bf40e 100644
> --- a/drivers/dma-buf/dma-buf.c
> +++ b/drivers/dma-buf/dma-buf.c
> @@ -948,7 +948,7 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev,
>  	if (WARN_ON(!dmabuf || !dev))
>  		return ERR_PTR(-EINVAL);
>  
> -	if (WARN_ON(importer_ops && !importer_ops->move_notify))
> +	if (WARN_ON(importer_ops && !importer_ops->invalidate_mappings))
>  		return ERR_PTR(-EINVAL);
>  
>  	attach = kzalloc(sizeof(*attach), GFP_KERNEL);
> @@ -1055,7 +1055,7 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_pin, "DMA_BUF");
>   *
>   * This unpins a buffer pinned by dma_buf_pin() and allows the exporter to move
>   * any mapping of @attach again and inform the importer through
> - * &dma_buf_attach_ops.move_notify.
> + * &dma_buf_attach_ops.invalidate_mappings.
>   */
>  void dma_buf_unpin(struct dma_buf_attachment *attach)
>  {
> @@ -1262,7 +1262,7 @@ void dma_buf_move_notify(struct dma_buf *dmabuf)
>  
>  	list_for_each_entry(attach, &dmabuf->attachments, node)
>  		if (attach->importer_ops)
> -			attach->importer_ops->move_notify(attach);
> +			attach->importer_ops->invalidate_mappings(attach);
>  }
>  EXPORT_SYMBOL_NS_GPL(dma_buf_move_notify, "DMA_BUF");
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
> index e22cfa7c6d32..863454148b28 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
> @@ -450,7 +450,7 @@ amdgpu_dma_buf_create_obj(struct drm_device *dev, struct dma_buf *dma_buf)
>  }
>  
>  /**
> - * amdgpu_dma_buf_move_notify - &attach.move_notify implementation
> + * amdgpu_dma_buf_move_notify - &attach.invalidate_mappings implementation
>   *
>   * @attach: the DMA-buf attachment
>   *
> @@ -521,7 +521,7 @@ amdgpu_dma_buf_move_notify(struct dma_buf_attachment *attach)
>  
>  static const struct dma_buf_attach_ops amdgpu_dma_buf_attach_ops = {
>  	.allow_peer2peer = true,
> -	.move_notify = amdgpu_dma_buf_move_notify
> +	.invalidate_mappings = amdgpu_dma_buf_move_notify
>  };
>  
>  /**
> diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c
> index ce49282198cb..19c78dd2ca77 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_prime.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_prime.c
> @@ -288,7 +288,7 @@ static void virtgpu_dma_buf_move_notify(struct dma_buf_attachment *attach)
>  
>  static const struct dma_buf_attach_ops virtgpu_dma_buf_attach_ops = {
>  	.allow_peer2peer = true,
> -	.move_notify = virtgpu_dma_buf_move_notify
> +	.invalidate_mappings = virtgpu_dma_buf_move_notify
>  };
>  
>  struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
> diff --git a/drivers/gpu/drm/xe/tests/xe_dma_buf.c b/drivers/gpu/drm/xe/tests/xe_dma_buf.c
> index 5df98de5ba3c..1f2cca5c2f81 100644
> --- a/drivers/gpu/drm/xe/tests/xe_dma_buf.c
> +++ b/drivers/gpu/drm/xe/tests/xe_dma_buf.c
> @@ -23,7 +23,7 @@ static bool p2p_enabled(struct dma_buf_test_params *params)
>  static bool is_dynamic(struct dma_buf_test_params *params)
>  {
>  	return IS_ENABLED(CONFIG_DMABUF_MOVE_NOTIFY) && params->attach_ops &&
> -		params->attach_ops->move_notify;
> +		params->attach_ops->invalidate_mappings;
>  }
>  
>  static void check_residency(struct kunit *test, struct xe_bo *exported,
> @@ -60,7 +60,7 @@ static void check_residency(struct kunit *test, struct xe_bo *exported,
>  
>  	/*
>  	 * Evict exporter. Evicting the exported bo will
> -	 * evict also the imported bo through the move_notify() functionality if
> +	 * evict also the imported bo through the invalidate_mappings() functionality if
>  	 * importer is on a different device. If they're on the same device,
>  	 * the exporter and the importer should be the same bo.
>  	 */
> @@ -198,7 +198,7 @@ static void xe_test_dmabuf_import_same_driver(struct xe_device *xe)
>  
>  static const struct dma_buf_attach_ops nop2p_attach_ops = {
>  	.allow_peer2peer = false,
> -	.move_notify = xe_dma_buf_move_notify
> +	.invalidate_mappings = xe_dma_buf_move_notify
>  };
>  
>  /*
> diff --git a/drivers/gpu/drm/xe/xe_dma_buf.c b/drivers/gpu/drm/xe/xe_dma_buf.c
> index 7c74a31d4486..1b9cd043e517 100644
> --- a/drivers/gpu/drm/xe/xe_dma_buf.c
> +++ b/drivers/gpu/drm/xe/xe_dma_buf.c
> @@ -287,7 +287,7 @@ static void xe_dma_buf_move_notify(struct dma_buf_attachment *attach)
>  
>  static const struct dma_buf_attach_ops xe_dma_buf_attach_ops = {
>  	.allow_peer2peer = true,
> -	.move_notify = xe_dma_buf_move_notify
> +	.invalidate_mappings = xe_dma_buf_move_notify
>  };
>  
>  #if IS_ENABLED(CONFIG_DRM_XE_KUNIT_TEST)
> diff --git a/drivers/infiniband/core/umem_dmabuf.c b/drivers/infiniband/core/umem_dmabuf.c
> index 0ec2e4120cc9..d77a739cfe7a 100644
> --- a/drivers/infiniband/core/umem_dmabuf.c
> +++ b/drivers/infiniband/core/umem_dmabuf.c
> @@ -129,7 +129,7 @@ ib_umem_dmabuf_get_with_dma_device(struct ib_device *device,
>  	if (check_add_overflow(offset, (unsigned long)size, &end))
>  		return ret;
>  
> -	if (unlikely(!ops || !ops->move_notify))
> +	if (unlikely(!ops || !ops->invalidate_mappings))
>  		return ret;
>  
>  	dmabuf = dma_buf_get(fd);
> @@ -195,7 +195,7 @@ ib_umem_dmabuf_unsupported_move_notify(struct dma_buf_attachment *attach)
>  
>  static struct dma_buf_attach_ops ib_umem_dmabuf_attach_pinned_ops = {
>  	.allow_peer2peer = true,
> -	.move_notify = ib_umem_dmabuf_unsupported_move_notify,
> +	.invalidate_mappings = ib_umem_dmabuf_unsupported_move_notify,
>  };
>  
>  struct ib_umem_dmabuf *
> diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
> index 325fa04cbe8a..97099d3b1688 100644
> --- a/drivers/infiniband/hw/mlx5/mr.c
> +++ b/drivers/infiniband/hw/mlx5/mr.c
> @@ -1620,7 +1620,7 @@ static void mlx5_ib_dmabuf_invalidate_cb(struct dma_buf_attachment *attach)
>  
>  static struct dma_buf_attach_ops mlx5_ib_dmabuf_attach_ops = {
>  	.allow_peer2peer = 1,
> -	.move_notify = mlx5_ib_dmabuf_invalidate_cb,
> +	.invalidate_mappings = mlx5_ib_dmabuf_invalidate_cb,
>  };
>  
>  static struct ib_mr *
> diff --git a/drivers/iommu/iommufd/pages.c b/drivers/iommu/iommufd/pages.c
> index dbe51ecb9a20..76f900fa1687 100644
> --- a/drivers/iommu/iommufd/pages.c
> +++ b/drivers/iommu/iommufd/pages.c
> @@ -1451,7 +1451,7 @@ static void iopt_revoke_notify(struct dma_buf_attachment *attach)
>  
>  static struct dma_buf_attach_ops iopt_dmabuf_attach_revoke_ops = {
>  	.allow_peer2peer = true,
> -	.move_notify = iopt_revoke_notify,
> +	.invalidate_mappings = iopt_revoke_notify,
>  };
>  
>  /*
> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
> index 0bc492090237..1b397635c793 100644
> --- a/include/linux/dma-buf.h
> +++ b/include/linux/dma-buf.h
> @@ -407,7 +407,7 @@ struct dma_buf {
>  	 *   through the device.
>  	 *
>  	 * - Dynamic importers should set fences for any access that they can't
> -	 *   disable immediately from their &dma_buf_attach_ops.move_notify
> +	 *   disable immediately from their &dma_buf_attach_ops.invalidate_mappings
>  	 *   callback.
>  	 *
>  	 * IMPORTANT:
> @@ -458,7 +458,7 @@ struct dma_buf_attach_ops {
>  	bool allow_peer2peer;
>  
>  	/**
> -	 * @move_notify: [optional] notification that the DMA-buf is moving
> +	 * @invalidate_mappings: [optional] notification that the DMA-buf is moving
>  	 *
>  	 * If this callback is provided the framework can avoid pinning the
>  	 * backing store while mappings exists.
> @@ -475,7 +475,7 @@ struct dma_buf_attach_ops {
>  	 * New mappings can be created after this callback returns, and will
>  	 * point to the new location of the DMA-buf.
>  	 */
> -	void (*move_notify)(struct dma_buf_attachment *attach);
> +	void (*invalidate_mappings)(struct dma_buf_attachment *attach);
>  };
>  
>  /**
> 

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