diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/drm_prime.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index ca09ce74e302..e82a976f0fba 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -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; |