[PATCH] dma-buf: use parameter structure for dma_buf_attach
Daniel Vetter
daniel at ffwll.ch
Mon Mar 26 08:36:38 UTC 2018
On Sun, Mar 25, 2018 at 01:34:51PM +0200, Christian König wrote:
> Move the parameters into a structure to make it simpler to extend it in
> follow up patches.
>
> This also adds the importer private as parameter so that we can directly
> work with a completely filled in attachment structure.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> ---
> drivers/dma-buf/dma-buf.c | 16 +++++++++-------
> drivers/gpu/drm/armada/armada_gem.c | 6 +++++-
> drivers/gpu/drm/drm_prime.c | 6 +++++-
> drivers/gpu/drm/i915/i915_gem_dmabuf.c | 6 +++++-
> drivers/gpu/drm/tegra/gem.c | 6 +++++-
> drivers/gpu/drm/udl/udl_dmabuf.c | 6 +++++-
> drivers/media/common/videobuf2/videobuf2-dma-contig.c | 6 +++++-
> drivers/media/common/videobuf2/videobuf2-dma-sg.c | 6 +++++-
> drivers/staging/media/tegra-vde/tegra-vde.c | 6 +++++-
> include/linux/dma-buf.h | 19 +++++++++++++++++--
> 10 files changed, 66 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> index d78d5fc173dc..d2e8ca0d9427 100644
> --- a/drivers/dma-buf/dma-buf.c
> +++ b/drivers/dma-buf/dma-buf.c
> @@ -534,8 +534,9 @@ EXPORT_SYMBOL_GPL(dma_buf_put);
> /**
> * dma_buf_attach - Add the device to dma_buf's attachments list; optionally,
> * calls attach() of dma_buf_ops to allow device-specific attach functionality
> - * @dmabuf: [in] buffer to attach device to.
> - * @dev: [in] device to be attached.
> + * @info: [in] holds all the attach related information provided
> + * by the importer. see &struct dma_buf_attach_info
> + * for further details.
Minor bikeshed, but I like to keep the object we operate on explicit, i.e.
leave the dmabuf as the first paramater and only stuff everything else
into the struct. But I don't think there's enough precedence either way.
> *
> * Returns struct dma_buf_attachment pointer for this attachment. Attachments
> * must be cleaned up by calling dma_buf_detach().
> @@ -549,26 +550,27 @@ EXPORT_SYMBOL_GPL(dma_buf_put);
> * accessible to @dev, and cannot be moved to a more suitable place. This is
> * indicated with the error code -EBUSY.
> */
> -struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
> - struct device *dev)
> +struct dma_buf_attachment *dma_buf_attach(const struct dma_buf_attach_info *info)
> {
> + struct dma_buf *dmabuf = info->dmabuf;
> struct dma_buf_attachment *attach;
> int ret;
>
> - if (WARN_ON(!dmabuf || !dev))
> + if (WARN_ON(!dmabuf || !info->dev))
> return ERR_PTR(-EINVAL);
>
> attach = kzalloc(sizeof(*attach), GFP_KERNEL);
> if (!attach)
> return ERR_PTR(-ENOMEM);
>
> - attach->dev = dev;
> + attach->dev = info->dev;
> attach->dmabuf = dmabuf;
> + attach->priv = info->priv;
The ->priv field is for the exporter, not the importer. See e.g.
drm_gem_map_attach. You can't let the importer set this now too, so needs
to be removed from the info struct.
-Daniel
>
> mutex_lock(&dmabuf->lock);
>
> if (dmabuf->ops->attach) {
> - ret = dmabuf->ops->attach(dmabuf, dev, attach);
> + ret = dmabuf->ops->attach(dmabuf, info->dev, attach);
> if (ret)
> goto err_attach;
> }
> diff --git a/drivers/gpu/drm/armada/armada_gem.c b/drivers/gpu/drm/armada/armada_gem.c
> index a97f509743a5..f4d1c11f57ea 100644
> --- a/drivers/gpu/drm/armada/armada_gem.c
> +++ b/drivers/gpu/drm/armada/armada_gem.c
> @@ -514,6 +514,10 @@ armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj,
> struct drm_gem_object *
> armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf)
> {
> + struct dma_buf_attach_info attach_info = {
> + .dev = dev->dev,
> + .dmabuf = buf
> + };
> struct dma_buf_attachment *attach;
> struct armada_gem_object *dobj;
>
> @@ -529,7 +533,7 @@ armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf)
> }
> }
>
> - attach = dma_buf_attach(buf, dev->dev);
> + attach = dma_buf_attach(&attach_info);
> 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 7856a9b3f8a8..4da242de51c2 100644
> --- a/drivers/gpu/drm/drm_prime.c
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -707,6 +707,10 @@ struct drm_gem_object *drm_gem_prime_import_dev(struct drm_device *dev,
> struct dma_buf *dma_buf,
> struct device *attach_dev)
> {
> + struct dma_buf_attach_info attach_info = {
> + .dev = attach_dev,
> + .dmabuf = dma_buf
> + };
> struct dma_buf_attachment *attach;
> struct sg_table *sgt;
> struct drm_gem_object *obj;
> @@ -727,7 +731,7 @@ 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_attach(&attach_info);
> if (IS_ERR(attach))
> return ERR_CAST(attach);
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
> index 864439a214c8..94552ef3e5a7 100644
> --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c
> +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
> @@ -288,6 +288,10 @@ static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = {
> struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
> struct dma_buf *dma_buf)
> {
> + struct dma_buf_attach_info attach_info = {
> + .dev = dev->dev,
> + .dmabuf = dma_buf
> + };
> struct dma_buf_attachment *attach;
> struct drm_i915_gem_object *obj;
> int ret;
> @@ -306,7 +310,7 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
> }
>
> /* need to attach */
> - attach = dma_buf_attach(dma_buf, dev->dev);
> + attach = dma_buf_attach(&attach_info);
> 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 49b9bf28f872..462a4bac3f82 100644
> --- a/drivers/gpu/drm/tegra/gem.c
> +++ b/drivers/gpu/drm/tegra/gem.c
> @@ -332,6 +332,10 @@ struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
> static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
> struct dma_buf *buf)
> {
> + struct dma_buf_attach_info attach_info = {
> + .dev = drm->dev,
> + .dmabuf = buf
> + };
> struct tegra_drm *tegra = drm->dev_private;
> struct dma_buf_attachment *attach;
> struct tegra_bo *bo;
> @@ -341,7 +345,7 @@ static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
> if (IS_ERR(bo))
> return bo;
>
> - attach = dma_buf_attach(buf, drm->dev);
> + attach = dma_buf_attach(&attach_info);
> if (IS_ERR(attach)) {
> err = PTR_ERR(attach);
> goto free;
> diff --git a/drivers/gpu/drm/udl/udl_dmabuf.c b/drivers/gpu/drm/udl/udl_dmabuf.c
> index 2867ed155ff6..c4db84abe231 100644
> --- a/drivers/gpu/drm/udl/udl_dmabuf.c
> +++ b/drivers/gpu/drm/udl/udl_dmabuf.c
> @@ -243,6 +243,10 @@ static int udl_prime_create(struct drm_device *dev,
> struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
> struct dma_buf *dma_buf)
> {
> + struct dma_buf_attach_info attach_info = {
> + .dev = dev->dev,
> + .dmabuf = dma_buf
> + };
> struct dma_buf_attachment *attach;
> struct sg_table *sg;
> struct udl_gem_object *uobj;
> @@ -250,7 +254,7 @@ struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
>
> /* need to attach */
> get_device(dev->dev);
> - attach = dma_buf_attach(dma_buf, dev->dev);
> + attach = dma_buf_attach(&attach_info);
> if (IS_ERR(attach)) {
> put_device(dev->dev);
> return ERR_CAST(attach);
> diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
> index f1178f6f434d..93bd1f40f756 100644
> --- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
> +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
> @@ -677,6 +677,10 @@ static void vb2_dc_detach_dmabuf(void *mem_priv)
> static void *vb2_dc_attach_dmabuf(struct device *dev, struct dma_buf *dbuf,
> unsigned long size, enum dma_data_direction dma_dir)
> {
> + struct dma_buf_attach_info attach_info = {
> + .dev = dev,
> + .dmabuf = dbuf
> + };
> struct vb2_dc_buf *buf;
> struct dma_buf_attachment *dba;
>
> @@ -692,7 +696,7 @@ static void *vb2_dc_attach_dmabuf(struct device *dev, struct dma_buf *dbuf,
>
> buf->dev = dev;
> /* create attachment for the dmabuf with the user device */
> - dba = dma_buf_attach(dbuf, buf->dev);
> + dba = dma_buf_attach(&attach_info);
> 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 753ed3138dcc..4e61050ba87f 100644
> --- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
> +++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
> @@ -609,6 +609,10 @@ static void vb2_dma_sg_detach_dmabuf(void *mem_priv)
> static void *vb2_dma_sg_attach_dmabuf(struct device *dev, struct dma_buf *dbuf,
> unsigned long size, enum dma_data_direction dma_dir)
> {
> + struct dma_buf_attach_info attach_info = {
> + .dev = dev,
> + .dmabuf = dbuf
> + };
> struct vb2_dma_sg_buf *buf;
> struct dma_buf_attachment *dba;
>
> @@ -624,7 +628,7 @@ static void *vb2_dma_sg_attach_dmabuf(struct device *dev, struct dma_buf *dbuf,
>
> buf->dev = dev;
> /* create attachment for the dmabuf with the user device */
> - dba = dma_buf_attach(dbuf, buf->dev);
> + dba = dma_buf_attach(&attach_info);
> if (IS_ERR(dba)) {
> pr_err("failed to attach dmabuf\n");
> kfree(buf);
> diff --git a/drivers/staging/media/tegra-vde/tegra-vde.c b/drivers/staging/media/tegra-vde/tegra-vde.c
> index c47659e96089..25d112443b0d 100644
> --- a/drivers/staging/media/tegra-vde/tegra-vde.c
> +++ b/drivers/staging/media/tegra-vde/tegra-vde.c
> @@ -529,6 +529,10 @@ static int tegra_vde_attach_dmabuf(struct device *dev,
> size_t *size,
> enum dma_data_direction dma_dir)
> {
> + struct dma_buf_attach_info attach_info = {
> + .dev = dev,
> + .dmabuf = dmabuf
> + };
> struct dma_buf_attachment *attachment;
> struct dma_buf *dmabuf;
> struct sg_table *sgt;
> @@ -547,7 +551,7 @@ static int tegra_vde_attach_dmabuf(struct device *dev,
> return -EINVAL;
> }
>
> - attachment = dma_buf_attach(dmabuf, dev);
> + attachment = dma_buf_attach(&attach_info);
> if (IS_ERR(attachment)) {
> dev_err(dev, "Failed to attach dmabuf\n");
> err = PTR_ERR(attachment);
> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
> index 085db2fee2d7..2c27568d44af 100644
> --- a/include/linux/dma-buf.h
> +++ b/include/linux/dma-buf.h
> @@ -362,6 +362,21 @@ struct dma_buf_export_info {
> struct dma_buf_export_info name = { .exp_name = KBUILD_MODNAME, \
> .owner = THIS_MODULE }
>
> +/**
> + * struct dma_buf_attach_info - holds information needed to attach to a dma_buf
> + * @dmabuf: the exported dma_buf
> + * @dev: the device which wants to import the attachment
> + * @priv: private data of importer to this attachment
> + *
> + * This structure holds the information required to attach to a buffer. Used
> + * with dma_buf_attach() only.
> + */
> +struct dma_buf_attach_info {
> + struct dma_buf *dmabuf;
> + struct device *dev;
> + void *priv;
> +};
> +
> /**
> * get_dma_buf - convenience wrapper for get_file.
> * @dmabuf: [in] pointer to dma_buf
> @@ -376,8 +391,8 @@ static inline void get_dma_buf(struct dma_buf *dmabuf)
> get_file(dmabuf->file);
> }
>
> -struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
> - struct device *dev);
> +struct dma_buf_attachment *
> +dma_buf_attach(const struct dma_buf_attach_info *info);
> void dma_buf_detach(struct dma_buf *dmabuf,
> struct dma_buf_attachment *dmabuf_attach);
>
> --
> 2.14.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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