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authorDaniel Vetter <daniel.vetter@ffwll.ch>2014-01-22 22:16:30 +0400
committerDaniel Vetter <daniel.vetter@ffwll.ch>2014-03-13 15:48:34 +0400
commit39cc344acd414eda231f612325cf824b976025e5 (patch)
treecfcf8105752fd87ec99dfac19ef16d50fb6b71b1 /drivers/gpu/drm/drm_prime.c
parent251261db7f71829968a8fe80ae3f296fc96851cd (diff)
downloadlinux-39cc344acd414eda231f612325cf824b976025e5.tar.xz
drm/doc: Add PRIME function references
For giant hilarity the DocBook reference overview is only generated when in a level 2 section, not in a level 3 section. So we need to move this up a bit as a side-by-side section to the main PRIME documentation. Whatever. To have a complete set of references add the missing kerneldoc for all functions exported to modules with the exception of the file private init/destroy functions - drivers have no business calling those, so let's just drop the EXPORT_SYMBOL instead. Also reflow the function parameters to align correctly and break at 80 chars - my OCD couldn't stand them while writing the kerneldoc ;-) Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_prime.c')
-rw-r--r--drivers/gpu/drm/drm_prime.c110
1 files changed, 89 insertions, 21 deletions
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 56805c39c906..f1437b6c8dbf 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -68,7 +68,8 @@ struct drm_prime_attachment {
enum dma_data_direction dir;
};
-static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle)
+static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv,
+ struct dma_buf *dma_buf, uint32_t handle)
{
struct drm_prime_member *member;
@@ -174,7 +175,7 @@ void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpr
}
static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
- enum dma_data_direction dir)
+ enum dma_data_direction dir)
{
struct drm_prime_attachment *prime_attach = attach->priv;
struct drm_gem_object *obj = attach->dmabuf->priv;
@@ -211,11 +212,19 @@ static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
}
static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
- struct sg_table *sgt, enum dma_data_direction dir)
+ struct sg_table *sgt,
+ enum dma_data_direction dir)
{
/* nothing to be done here */
}
+/**
+ * drm_gem_dmabuf_release - dma_buf release implementation for GEM
+ * @dma_buf: buffer to be released
+ *
+ * Generic release function for dma_bufs exported as PRIME buffers. GEM drivers
+ * must use this in their dma_buf ops structure as the release callback.
+ */
void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
{
struct drm_gem_object *obj = dma_buf->priv;
@@ -242,30 +251,30 @@ static void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
}
static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
- unsigned long page_num)
+ unsigned long page_num)
{
return NULL;
}
static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
- unsigned long page_num, void *addr)
+ unsigned long page_num, void *addr)
{
}
static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf,
- unsigned long page_num)
+ unsigned long page_num)
{
return NULL;
}
static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf,
- unsigned long page_num, void *addr)
+ unsigned long page_num, void *addr)
{
}
static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf,
- struct vm_area_struct *vma)
+ struct vm_area_struct *vma)
{
struct drm_gem_object *obj = dma_buf->priv;
struct drm_device *dev = obj->dev;
@@ -315,6 +324,15 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
* driver's scatter/gather table
*/
+/**
+ * drm_gem_prime_export - helper library implemention of the export callback
+ * @dev: drm_device to export from
+ * @obj: GEM object to export
+ * @flags: flags like DRM_CLOEXEC
+ *
+ * This is the implementation of the gem_prime_export functions for GEM drivers
+ * using the PRIME helpers.
+ */
struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj, int flags)
{
@@ -355,9 +373,23 @@ static struct dma_buf *export_and_register_object(struct drm_device *dev,
return dmabuf;
}
+/**
+ * drm_gem_prime_handle_to_fd - PRIME export function for GEM drivers
+ * @dev: dev to export the buffer from
+ * @file_priv: drm file-private structure
+ * @handle: buffer handle to export
+ * @flags: flags like DRM_CLOEXEC
+ * @prime_fd: pointer to storage for the fd id of the create dma-buf
+ *
+ * This is the PRIME export function which must be used mandatorily by GEM
+ * drivers to ensure correct lifetime management of the underlying GEM object.
+ * The actual exporting from GEM object to a dma-buf is done through the
+ * gem_prime_export driver callback.
+ */
int drm_gem_prime_handle_to_fd(struct drm_device *dev,
- struct drm_file *file_priv, uint32_t handle, uint32_t flags,
- int *prime_fd)
+ struct drm_file *file_priv, uint32_t handle,
+ uint32_t flags,
+ int *prime_fd)
{
struct drm_gem_object *obj;
int ret = 0;
@@ -441,6 +473,14 @@ out_unlock:
}
EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
+/**
+ * drm_gem_prime_import - helper library implemention of the import callback
+ * @dev: drm_device to import into
+ * @dma_buf: dma-buf object to import
+ *
+ * This is the implementation of the gem_prime_import functions for GEM drivers
+ * using the PRIME helpers.
+ */
struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
@@ -496,8 +536,21 @@ fail_detach:
}
EXPORT_SYMBOL(drm_gem_prime_import);
+/**
+ * drm_gem_prime_fd_to_handle - PRIME import function for GEM drivers
+ * @dev: dev to export the buffer from
+ * @file_priv: drm file-private structure
+ * @prime_fd: fd id of the dma-buf which should be imported
+ * @handle: pointer to storage for the handle of the imported buffer object
+ *
+ * This is the PRIME import function which must be used mandatorily by GEM
+ * drivers to ensure correct lifetime management of the underlying GEM object.
+ * The actual importing of GEM object from the dma-buf is done through the
+ * gem_import_export driver callback.
+ */
int drm_gem_prime_fd_to_handle(struct drm_device *dev,
- struct drm_file *file_priv, int prime_fd, uint32_t *handle)
+ struct drm_file *file_priv, int prime_fd,
+ uint32_t *handle)
{
struct dma_buf *dma_buf;
struct drm_gem_object *obj;
@@ -598,12 +651,14 @@ int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
args->fd, &args->handle);
}
-/*
- * drm_prime_pages_to_sg
+/**
+ * drm_prime_pages_to_sg - converts a page array into an sg list
+ * @pages: pointer to the array of page pointers to convert
+ * @nr_pages: length of the page vector
*
- * this helper creates an sg table object from a set of pages
+ * This helper creates an sg table object from a set of pages
* the driver is responsible for mapping the pages into the
- * importers address space
+ * importers address space for use with dma_buf itself.
*/
struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages)
{
@@ -628,9 +683,16 @@ out:
}
EXPORT_SYMBOL(drm_prime_pages_to_sg);
-/* export an sg table into an array of pages and addresses
- this is currently required by the TTM driver in order to do correct fault
- handling */
+/**
+ * drm_prime_sg_to_page_addr_arrays - convert an sg table into a page array
+ * @sgt: scatter-gather table to convert
+ * @pages: array of page pointers to store the page array in
+ * @addrs: optional array to store the dma bus address of each page
+ * @max_pages: size of both the passed-in arrays
+ *
+ * Exports an sg table into an array of pages and addresses. This is currently
+ * required by the TTM driver in order to do correct fault handling.
+ */
int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
dma_addr_t *addrs, int max_pages)
{
@@ -663,7 +725,15 @@ int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
return 0;
}
EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays);
-/* helper function to cleanup a GEM/prime object */
+
+/**
+ * drm_prime_gem_destroy - helper to clean up a PRIME-imported GEM object
+ * @obj: GEM object which was created from a dma-buf
+ * @sg: the sg-table which was pinned at import time
+ *
+ * This is the cleanup functions which GEM drivers need to call when they use
+ * @drm_gem_prime_import to import dma-bufs.
+ */
void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg)
{
struct dma_buf_attachment *attach;
@@ -683,11 +753,9 @@ void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv)
INIT_LIST_HEAD(&prime_fpriv->head);
mutex_init(&prime_fpriv->lock);
}
-EXPORT_SYMBOL(drm_prime_init_file_private);
void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv)
{
/* by now drm_gem_release should've made sure the list is empty */
WARN_ON(!list_empty(&prime_fpriv->head));
}
-EXPORT_SYMBOL(drm_prime_destroy_file_private);