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drm: add kernel doc for exported gem dmabuf_ops

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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
This commit is contained in:
Samuel Li 2018-01-18 16:44:20 -05:00 committed by Alex Deucher
parent e1ca774b3e
commit f7a71b0cf9
1 changed files with 88 additions and 0 deletions
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88
drivers/gpu/drm/drm_prime.c
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@ -73,6 +73,9 @@
* Drivers should detect this situation and return back the gem object
* from the dma-buf private. Prime will do this automatically for drivers that
* use the drm_gem_prime_{import,export} helpers.
*
* GEM struct &dma_buf_ops symbols are now exported. They can be resued by
* drivers which implement GEM interface.
*/
struct drm_prime_member {
@ -180,6 +183,18 @@ static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpri
return -ENOENT;
}
/**
* drm_gem_map_attach - dma_buf attach implementation for GEM
* @dma_buf: buffer to attach device to
* @target_dev: not used
* @attach: buffer attachment data
*
* Allocates &drm_prime_attachment and calls &drm_driver.gem_prime_pin for
* device specific attachment. This can be used as the &dma_buf_ops.attach
* callback.
*
* Returns 0 on success, negative error code on failure.
*/
int drm_gem_map_attach(struct dma_buf *dma_buf, struct device *target_dev,
struct dma_buf_attachment *attach)
{
@ -201,6 +216,14 @@ int drm_gem_map_attach(struct dma_buf *dma_buf, struct device *target_dev,
}
EXPORT_SYMBOL(drm_gem_map_attach);
/**
* drm_gem_map_detach - dma_buf detach implementation for GEM
* @dma_buf: buffer to detach from
* @attach: attachment to be detached
*
* Cleans up &dma_buf_attachment. This can be used as the &dma_buf_ops.detach
* callback.
*/
void drm_gem_map_detach(struct dma_buf *dma_buf,
struct dma_buf_attachment *attach)
{
@ -255,6 +278,18 @@ void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpr
}
}
/**
* drm_gem_map_dma_buf - map_dma_buf implementation for GEM
* @attach: attachment whose scatterlist is to be returned
* @dir: direction of DMA transfer
*
* Calls &drm_driver.gem_prime_get_sg_table and then maps the scatterlist. This
* can be used as the &dma_buf_ops.map_dma_buf callback.
*
* Returns sg_table containing the scatterlist to be returned; returns ERR_PTR
* on error. May return -EINTR if it is interrupted by a signal.
*/
struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
enum dma_data_direction dir)
{
@ -294,6 +329,12 @@ struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
}
EXPORT_SYMBOL(drm_gem_map_dma_buf);
/**
* drm_gem_unmap_dma_buf - unmap_dma_buf implementation for GEM
*
* Not implemented. The unmap is done at drm_gem_map_detach(). This can be
* used as the &dma_buf_ops.unmap_dma_buf callback.
*/
void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
@ -351,6 +392,15 @@ void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
}
EXPORT_SYMBOL(drm_gem_dmabuf_release);
/**
* drm_gem_dmabuf_vmap - dma_buf vmap implementation for GEM
* @dma_buf: buffer to be mapped
*
* Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap
* callback.
*
* Returns the kernel virtual address.
*/
void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
{
struct drm_gem_object *obj = dma_buf->priv;
@ -360,6 +410,14 @@ void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
}
EXPORT_SYMBOL(drm_gem_dmabuf_vmap);
/**
* drm_gem_dmabuf_vunmap - dma_buf vunmap implementation for GEM
* @dma_buf: buffer to be unmapped
* @vaddr: the virtual address of the buffer
*
* Releases a kernel virtual mapping. This can be used as the
* &dma_buf_ops.vunmap callback.
*/
void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
{
struct drm_gem_object *obj = dma_buf->priv;
@ -369,6 +427,11 @@ void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
}
EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);
/**
* drm_gem_dmabuf_kmap_atomic - map_atomic implementation for GEM
*
* Not implemented. This can be used as the &dma_buf_ops.map_atomic callback.
*/
void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
unsigned long page_num)
{
@ -376,6 +439,11 @@ void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
}
EXPORT_SYMBOL(drm_gem_dmabuf_kmap_atomic);
/**
* drm_gem_dmabuf_kunmap_atomic - unmap_atomic implementation for GEM
*
* Not implemented. This can be used as the &dma_buf_ops.unmap_atomic callback.
*/
void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
unsigned long page_num, void *addr)
{
@ -383,12 +451,22 @@ void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
}
EXPORT_SYMBOL(drm_gem_dmabuf_kunmap_atomic);
/**
* drm_gem_dmabuf_kmap - map implementation for GEM
*
* Not implemented. This can be used as the &dma_buf_ops.map callback.
*/
void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
{
return NULL;
}
EXPORT_SYMBOL(drm_gem_dmabuf_kmap);
/**
* drm_gem_dmabuf_kunmap - unmap implementation for GEM
*
* Not implemented. This can be used as the &dma_buf_ops.unmap callback.
*/
void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num,
void *addr)
{
@ -396,6 +474,16 @@ void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num,
}
EXPORT_SYMBOL(drm_gem_dmabuf_kunmap);
/**
* drm_gem_dmabuf_mmap - dma_buf mmap implementation for GEM
* @dma_buf: buffer to be mapped
* @vma: virtual address range
*
* Provides memory mapping for the buffer. This can be used as the
* &dma_buf_ops.mmap callback.
*
* Returns 0 on success or a negative error code on failure.
*/
int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
{
struct drm_gem_object *obj = dma_buf->priv;