From: Sumit Semwal Date: Fri, 23 Jan 2015 07:23:43 +0000 (+0530) Subject: dma-buf: cleanup dma_buf_export() to make it easily extensible X-Git-Tag: omap-for-v4.2/o2_dc~22^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d8fbe341beb617ebb22b98fb893e4aa32ae2d864;p=pandora-kernel.git dma-buf: cleanup dma_buf_export() to make it easily extensible At present, dma_buf_export() takes a series of parameters, which makes it difficult to add any new parameters for exporters, if required. Make it simpler by moving all these parameters into a struct, and pass the struct * as parameter to dma_buf_export(). While at it, unite dma_buf_export_named() with dma_buf_export(), and change all callers accordingly. Reviewed-by: Maarten Lankhorst Reviewed-by: Daniel Thompson Acked-by: Mauro Carvalho Chehab Acked-by: Dave Airlie Signed-off-by: Sumit Semwal --- diff --git a/Documentation/dma-buf-sharing.txt b/Documentation/dma-buf-sharing.txt index bb9753b635a3..480c8de3c2c4 100644 --- a/Documentation/dma-buf-sharing.txt +++ b/Documentation/dma-buf-sharing.txt @@ -49,25 +49,26 @@ The dma_buf buffer sharing API usage contains the following steps: The buffer exporter announces its wish to export a buffer. In this, it connects its own private buffer data, provides implementation for operations that can be performed on the exported dma_buf, and flags for the file - associated with this buffer. + associated with this buffer. All these fields are filled in struct + dma_buf_export_info, defined via the DEFINE_DMA_BUF_EXPORT_INFO macro. Interface: - struct dma_buf *dma_buf_export_named(void *priv, struct dma_buf_ops *ops, - size_t size, int flags, - const char *exp_name) + DEFINE_DMA_BUF_EXPORT_INFO(exp_info) + struct dma_buf *dma_buf_export(struct dma_buf_export_info *exp_info) - If this succeeds, dma_buf_export_named allocates a dma_buf structure, and + If this succeeds, dma_buf_export allocates a dma_buf structure, and returns a pointer to the same. It also associates an anonymous file with this buffer, so it can be exported. On failure to allocate the dma_buf object, it returns NULL. - 'exp_name' is the name of exporter - to facilitate information while - debugging. + 'exp_name' in struct dma_buf_export_info is the name of exporter - to + facilitate information while debugging. It is set to KBUILD_MODNAME by + default, so exporters don't have to provide a specific name, if they don't + wish to. + + DEFINE_DMA_BUF_EXPORT_INFO macro defines the struct dma_buf_export_info, + zeroes it out and pre-populates exp_name in it. - Exporting modules which do not wish to provide any specific name may use the - helper define 'dma_buf_export()', with the same arguments as above, but - without the last argument; a KBUILD_MODNAME pre-processor directive will be - inserted in place of 'exp_name' instead. 2. Userspace gets a handle to pass around to potential buffer-users diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 5be225c2ba98..c5a9138a6a8d 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -265,43 +265,40 @@ static inline int is_dma_buf_file(struct file *file) } /** - * dma_buf_export_named - Creates a new dma_buf, and associates an anon file + * dma_buf_export - Creates a new dma_buf, and associates an anon file * with this buffer, so it can be exported. * Also connect the allocator specific data and ops to the buffer. * Additionally, provide a name string for exporter; useful in debugging. * - * @priv: [in] Attach private data of allocator to this buffer - * @ops: [in] Attach allocator-defined dma buf ops to the new buffer. - * @size: [in] Size of the buffer - * @flags: [in] mode flags for the file. - * @exp_name: [in] name of the exporting module - useful for debugging. - * @resv: [in] reservation-object, NULL to allocate default one. + * @exp_info: [in] holds all the export related information provided + * by the exporter. see struct dma_buf_export_info + * for further details. * * Returns, on success, a newly created dma_buf object, which wraps the * supplied private data and operations for dma_buf_ops. On either missing * ops, or error in allocating struct dma_buf, will return negative error. * */ -struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, - size_t size, int flags, const char *exp_name, - struct reservation_object *resv) +struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info) { struct dma_buf *dmabuf; + struct reservation_object *resv = exp_info->resv; struct file *file; size_t alloc_size = sizeof(struct dma_buf); - if (!resv) + if (!exp_info->resv) alloc_size += sizeof(struct reservation_object); else /* prevent &dma_buf[1] == dma_buf->resv */ alloc_size += 1; - if (WARN_ON(!priv || !ops - || !ops->map_dma_buf - || !ops->unmap_dma_buf - || !ops->release - || !ops->kmap_atomic - || !ops->kmap - || !ops->mmap)) { + if (WARN_ON(!exp_info->priv + || !exp_info->ops + || !exp_info->ops->map_dma_buf + || !exp_info->ops->unmap_dma_buf + || !exp_info->ops->release + || !exp_info->ops->kmap_atomic + || !exp_info->ops->kmap + || !exp_info->ops->mmap)) { return ERR_PTR(-EINVAL); } @@ -309,10 +306,10 @@ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, if (dmabuf == NULL) return ERR_PTR(-ENOMEM); - dmabuf->priv = priv; - dmabuf->ops = ops; - dmabuf->size = size; - dmabuf->exp_name = exp_name; + dmabuf->priv = exp_info->priv; + dmabuf->ops = exp_info->ops; + dmabuf->size = exp_info->size; + dmabuf->exp_name = exp_info->exp_name; init_waitqueue_head(&dmabuf->poll); dmabuf->cb_excl.poll = dmabuf->cb_shared.poll = &dmabuf->poll; dmabuf->cb_excl.active = dmabuf->cb_shared.active = 0; @@ -323,7 +320,8 @@ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, } dmabuf->resv = resv; - file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, flags); + file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, + exp_info->flags); if (IS_ERR(file)) { kfree(dmabuf); return ERR_CAST(file); @@ -341,8 +339,7 @@ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, return dmabuf; } -EXPORT_SYMBOL_GPL(dma_buf_export_named); - +EXPORT_SYMBOL_GPL(dma_buf_export); /** * dma_buf_fd - returns a file descriptor for the given dma_buf diff --git a/drivers/gpu/drm/armada/armada_gem.c b/drivers/gpu/drm/armada/armada_gem.c index ef5feeecec84..580e10acaa3a 100644 --- a/drivers/gpu/drm/armada/armada_gem.c +++ b/drivers/gpu/drm/armada/armada_gem.c @@ -538,8 +538,14 @@ struct dma_buf * armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags) { - return dma_buf_export(obj, &armada_gem_prime_dmabuf_ops, obj->size, - O_RDWR, NULL); + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + + exp_info.ops = &armada_gem_prime_dmabuf_ops; + exp_info.size = obj->size; + exp_info.flags = O_RDWR; + exp_info.priv = obj; + + return dma_buf_export(&exp_info); } struct drm_gem_object * diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 7482b06cd08f..7fec191b45f7 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -339,13 +339,17 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { struct dma_buf *drm_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags) { - struct reservation_object *robj = NULL; + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + + exp_info.ops = &drm_gem_prime_dmabuf_ops; + exp_info.size = obj->size; + exp_info.flags = flags; + exp_info.priv = obj; if (dev->driver->gem_prime_res_obj) - robj = dev->driver->gem_prime_res_obj(obj); + exp_info.resv = dev->driver->gem_prime_res_obj(obj); - return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size, - flags, robj); + return dma_buf_export(&exp_info); } EXPORT_SYMBOL(drm_gem_prime_export); diff --git a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c index 3833bf8ca025..cd485c091b30 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c @@ -185,9 +185,14 @@ struct dma_buf *exynos_dmabuf_prime_export(struct drm_device *drm_dev, struct drm_gem_object *obj, int flags) { struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); - return dma_buf_export(obj, &exynos_dmabuf_ops, - exynos_gem_obj->base.size, flags, NULL); + exp_info.ops = &exynos_dmabuf_ops; + exp_info.size = exynos_gem_obj->base.size; + exp_info.flags = flags; + exp_info.priv = obj; + + return dma_buf_export(&exp_info); } struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev, diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index 82a1f4b57778..7998da27c500 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c @@ -230,6 +230,13 @@ struct dma_buf *i915_gem_prime_export(struct drm_device *dev, struct drm_gem_object *gem_obj, int flags) { struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + + exp_info.ops = &i915_dmabuf_ops; + exp_info.size = gem_obj->size; + exp_info.flags = flags; + exp_info.priv = gem_obj; + if (obj->ops->dmabuf_export) { int ret = obj->ops->dmabuf_export(obj); @@ -237,8 +244,7 @@ struct dma_buf *i915_gem_prime_export(struct drm_device *dev, return ERR_PTR(ret); } - return dma_buf_export(gem_obj, &i915_dmabuf_ops, gem_obj->size, flags, - NULL); + return dma_buf_export(&exp_info); } static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c index b46dabd9faf7..344fd789170d 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c @@ -171,7 +171,14 @@ static struct dma_buf_ops omap_dmabuf_ops = { struct dma_buf *omap_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags) { - return dma_buf_export(obj, &omap_dmabuf_ops, obj->size, flags, NULL); + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + + exp_info.ops = &omap_dmabuf_ops; + exp_info.size = obj->size; + exp_info.flags = flags; + exp_info.priv = obj; + + return dma_buf_export(&exp_info); } struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev, diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c index cfb481943b6b..1217272a51f2 100644 --- a/drivers/gpu/drm/tegra/gem.c +++ b/drivers/gpu/drm/tegra/gem.c @@ -627,8 +627,14 @@ struct dma_buf *tegra_gem_prime_export(struct drm_device *drm, struct drm_gem_object *gem, int flags) { - return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size, - flags, NULL); + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + + exp_info.ops = &tegra_gem_prime_dmabuf_ops; + exp_info.size = gem->size; + exp_info.flags = flags; + exp_info.priv = gem; + + return dma_buf_export(&exp_info); } struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm, Reading git-diff-tree failed