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drm: add kernel doc for exported gem dmabuf_ops
Signed-off-by: Samuel Li <Samuel.Li@amd.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/1516311860-24949-1-git-send-email-Samuel.Li@amd.com
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@ -73,6 +73,9 @@
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* Drivers should detect this situation and return back the gem object
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* from the dma-buf private. Prime will do this automatically for drivers that
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* use the drm_gem_prime_{import,export} helpers.
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*
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* GEM struct &dma_buf_ops symbols are now exported. They can be resued by
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* drivers which implement GEM interface.
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*/
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struct drm_prime_member {
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@ -180,6 +183,18 @@ static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpri
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return -ENOENT;
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}
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/**
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* drm_gem_map_attach - dma_buf attach implementation for GEM
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* @dma_buf: buffer to attach device to
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* @target_dev: not used
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* @attach: buffer attachment data
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*
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* Allocates &drm_prime_attachment and calls &drm_driver.gem_prime_pin for
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* device specific attachment. This can be used as the &dma_buf_ops.attach
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* callback.
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*
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* Returns 0 on success, negative error code on failure.
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*/
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int drm_gem_map_attach(struct dma_buf *dma_buf, struct device *target_dev,
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struct dma_buf_attachment *attach)
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{
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@ -201,6 +216,14 @@ int drm_gem_map_attach(struct dma_buf *dma_buf, struct device *target_dev,
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}
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EXPORT_SYMBOL(drm_gem_map_attach);
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/**
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* drm_gem_map_detach - dma_buf detach implementation for GEM
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* @dma_buf: buffer to detach from
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* @attach: attachment to be detached
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*
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* Cleans up &dma_buf_attachment. This can be used as the &dma_buf_ops.detach
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* callback.
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*/
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void drm_gem_map_detach(struct dma_buf *dma_buf,
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struct dma_buf_attachment *attach)
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{
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@ -255,6 +278,18 @@ void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpr
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}
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}
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/**
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* drm_gem_map_dma_buf - map_dma_buf implementation for GEM
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* @attach: attachment whose scatterlist is to be returned
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* @dir: direction of DMA transfer
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*
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* Calls &drm_driver.gem_prime_get_sg_table and then maps the scatterlist. This
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* can be used as the &dma_buf_ops.map_dma_buf callback.
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*
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* Returns sg_table containing the scatterlist to be returned; returns ERR_PTR
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* on error. May return -EINTR if it is interrupted by a signal.
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*/
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struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
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enum dma_data_direction dir)
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{
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@ -294,6 +329,12 @@ struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
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}
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EXPORT_SYMBOL(drm_gem_map_dma_buf);
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/**
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* drm_gem_unmap_dma_buf - unmap_dma_buf implementation for GEM
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*
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* Not implemented. The unmap is done at drm_gem_map_detach(). This can be
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* used as the &dma_buf_ops.unmap_dma_buf callback.
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*/
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void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
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struct sg_table *sgt,
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enum dma_data_direction dir)
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@ -351,6 +392,15 @@ void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_release);
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/**
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* drm_gem_dmabuf_vmap - dma_buf vmap implementation for GEM
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* @dma_buf: buffer to be mapped
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*
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* Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap
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* callback.
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*
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* Returns the kernel virtual address.
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*/
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void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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@ -360,6 +410,14 @@ void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_vmap);
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/**
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* drm_gem_dmabuf_vunmap - dma_buf vunmap implementation for GEM
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* @dma_buf: buffer to be unmapped
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* @vaddr: the virtual address of the buffer
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*
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* Releases a kernel virtual mapping. This can be used as the
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* &dma_buf_ops.vunmap callback.
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*/
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void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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@ -369,6 +427,11 @@ void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);
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/**
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* drm_gem_dmabuf_kmap_atomic - map_atomic implementation for GEM
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*
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* Not implemented. This can be used as the &dma_buf_ops.map_atomic callback.
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*/
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void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
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unsigned long page_num)
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{
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@ -376,6 +439,11 @@ void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_kmap_atomic);
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/**
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* drm_gem_dmabuf_kunmap_atomic - unmap_atomic implementation for GEM
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*
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* Not implemented. This can be used as the &dma_buf_ops.unmap_atomic callback.
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*/
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void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
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unsigned long page_num, void *addr)
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{
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@ -383,12 +451,22 @@ void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_kunmap_atomic);
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/**
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* drm_gem_dmabuf_kmap - map implementation for GEM
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*
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* Not implemented. This can be used as the &dma_buf_ops.map callback.
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*/
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void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
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{
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return NULL;
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_kmap);
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/**
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* drm_gem_dmabuf_kunmap - unmap implementation for GEM
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*
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* Not implemented. This can be used as the &dma_buf_ops.unmap callback.
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*/
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void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num,
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void *addr)
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{
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@ -396,6 +474,16 @@ void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num,
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_kunmap);
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/**
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* drm_gem_dmabuf_mmap - dma_buf mmap implementation for GEM
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* @dma_buf: buffer to be mapped
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* @vma: virtual address range
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*
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* Provides memory mapping for the buffer. This can be used as the
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* &dma_buf_ops.mmap callback.
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*
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* Returns 0 on success or a negative error code on failure.
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*/
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int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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