[PATCH] drm/prime: Update docs

Daniel Vetter
2019-06-20T12:46:15Z

Yes this is a bit a big patch, but since it's essentially a complete
rewrite of all the prime docs I didn't see how to better split it up.

Changes:
- Consistently point to drm_gem_object_funcs as the preferred hooks,
where applicable.

- Document all the hooks in &drm_driver that lacked kerneldoc.

- Completely new overview section, which now also includes the cleaned
up lifetime/reference counting subchapter. I also mentioned the weak
references in there due to the lookup caches.

- Completely rewritten helper intro section, highlight the
import/export related functionality.

- Polish for all the functions and more cross references.

I also sprinkled a bunch of todos all over.

Most important: 0 code changes in here. The cleanup motivated by
reading and improving all this will follow later on.

v2: Actually update the prime helper docs. Plus add a few FIXMEs that
I won't address right away in subsequent cleanup patches.

v3:
- Split out the function moving. This patch is now exclusively
documentation changes.
- Typos and nits (Sam).

v4: Polish suggestions from Noralf.

Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Noralf Trønnes <noralf@tronnes.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Eric Anholt <eric@anholt.net>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
Documentation/gpu/drm-mm.rst | 40 +------
drivers/gpu/drm/drm_prime.c | 201 +++++++++++++++++++++--------------
include/drm/drm_drv.h | 104 +++++++++++++++---
include/drm/drm_gem.h | 18 ++--
4 files changed, 229 insertions(+), 134 deletions(-)

diff --git a/Documentation/gpu/drm-mm.rst b/Documentation/gpu/drm-mm.rst
index c8ebd4f66a6a..b664f054c259 100644
--- a/Documentation/gpu/drm-mm.rst
+++ b/Documentation/gpu/drm-mm.rst
@@ -433,43 +433,11 @@ PRIME is the cross device buffer sharing framework in drm, originally
created for the OPTIMUS range of multi-gpu platforms. To userspace PRIME
buffers are dma-buf based file descriptors.

-Overview and Driver Interface
------------------------------
+Overview and Lifetime Rules
+---------------------------

-Similar to GEM global names, PRIME file descriptors are also used to
-share buffer objects across processes. They offer additional security:
-as file descriptors must be explicitly sent over UNIX domain sockets to
-be shared between applications, they can't be guessed like the globally
-unique GEM names.
-
-Drivers that support the PRIME API must set the DRIVER_PRIME bit in the
-struct :c:type:`struct drm_driver <drm_driver>`
-driver_features field, and implement the prime_handle_to_fd and
-prime_fd_to_handle operations.
-
-int (\*prime_handle_to_fd)(struct drm_device \*dev, struct drm_file
-\*file_priv, uint32_t handle, uint32_t flags, int \*prime_fd); int
-(\*prime_fd_to_handle)(struct drm_device \*dev, struct drm_file
-\*file_priv, int prime_fd, uint32_t \*handle); Those two operations
-convert a handle to a PRIME file descriptor and vice versa. Drivers must
-use the kernel dma-buf buffer sharing framework to manage the PRIME file
-descriptors. Similar to the mode setting API PRIME is agnostic to the
-underlying buffer object manager, as long as handles are 32bit unsigned
-integers.
-
-While non-GEM drivers must implement the operations themselves, GEM
-drivers must use the :c:func:`drm_gem_prime_handle_to_fd()` and
-:c:func:`drm_gem_prime_fd_to_handle()` helper functions. Those
-helpers rely on the driver gem_prime_export and gem_prime_import
-operations to create a dma-buf instance from a GEM object (dma-buf
-exporter role) and to create a GEM object from a dma-buf instance
-(dma-buf importer role).
-
-struct dma_buf \* (\*gem_prime_export)(struct drm_device \*dev,
-struct drm_gem_object \*obj, int flags); struct drm_gem_object \*
-(\*gem_prime_import)(struct drm_device \*dev, struct dma_buf
-\*dma_buf); These two operations are mandatory for GEM drivers that
-support PRIME.
+.. kernel-doc:: drivers/gpu/drm/drm_prime.c
+ :doc: overview and lifetime rules

PRIME Helper Functions
----------------------
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 68b4de85370c..c269bc03c42a 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -38,47 +38,53 @@

#include "drm_internal.h"

-/*
- * DMA-BUF/GEM Object references and lifetime overview:
- *
- * On the export the dma_buf holds a reference to the exporting GEM
- * object. It takes this reference in handle_to_fd_ioctl, when it
- * first calls .prime_export and stores the exporting GEM object in
- * the dma_buf priv. This reference needs to be released when the
- * final reference to the &dma_buf itself is dropped and its
- * &dma_buf_ops.release function is called. For GEM-based drivers,
- * the dma_buf should be exported using drm_gem_dmabuf_export() and
- * then released by drm_gem_dmabuf_release().
- *
- * On the import the importing GEM object holds a reference to the
- * dma_buf (which in turn holds a ref to the exporting GEM object).
- * It takes that reference in the fd_to_handle ioctl.
- * It calls dma_buf_get, creates an attachment to it and stores the
- * attachment in the GEM object. When this attachment is destroyed
- * when the imported object is destroyed, we remove the attachment
- * and drop the reference to the dma_buf.
- *
- * When all the references to the &dma_buf are dropped, i.e. when
- * userspace has closed both handles to the imported GEM object (through the
- * FD_TO_HANDLE IOCTL) and closed the file descriptor of the exported
- * (through the HANDLE_TO_FD IOCTL) dma_buf, and all kernel-internal references
- * are also gone, then the dma_buf gets destroyed. This can also happen as a
- * part of the clean up procedure in the drm_release() function if userspace
- * fails to properly clean up. Note that both the kernel and userspace (by
- * keeeping the PRIME file descriptors open) can hold references onto a
- * &dma_buf.
- *
- * Thus the chain of references always flows in one direction
- * (avoiding loops): importing_gem -> dmabuf -> exporting_gem
- *
- * Self-importing: if userspace is using PRIME as a replacement for flink
- * then it will get a fd->handle request for a GEM object that it created.
- * 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.
+/**
+ * DOC: overview and lifetime rules
+ *
+ * Similar to GEM global names, PRIME file descriptors are also used to share
+ * buffer objects across processes. They offer additional security: as file
+ * descriptors must be explicitly sent over UNIX domain sockets to be shared
+ * between applications, they can't be guessed like the globally unique GEM
+ * names.
+ *
+ * Drivers that support the PRIME API must set the DRIVER_PRIME bit in the
+ * &drm_driver.driver_features field, and implement the
+ * &drm_driver.prime_handle_to_fd and &drm_driver.prime_fd_to_handle operations.
+ * GEM based drivers must use drm_gem_prime_handle_to_fd() and
+ * drm_gem_prime_fd_to_handle() to implement these. For GEM based drivers the
+ * actual driver interfaces is provided through the &drm_gem_object_funcs.export
+ * and &drm_driver.gem_prime_import hooks.
+ *
+ * &dma_buf_ops implementations for GEM drivers are all individually exported
+ * for drivers which need to overwrite or reimplement some of them.
+ *
+ * Reference Counting for GEM Drivers
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * On the export the &dma_buf holds a reference to the exported buffer object,
+ * usually a &drm_gem_object. It takes this reference in the PRIME_HANDLE_TO_FD
+ * IOCTL, when it first calls &drm_gem_object_funcs.export
+ * and stores the exporting GEM object in the &dma_buf.priv field. This
+ * reference needs to be released when the final reference to the &dma_buf
+ * itself is dropped and its &dma_buf_ops.release function is called. For
+ * GEM-based drivers, the &dma_buf should be exported using
+ * drm_gem_dmabuf_export() and then released by drm_gem_dmabuf_release().
+ *
+ * Thus the chain of references always flows in one direction, avoiding loops:
+ * importing GEM object -> dma-buf -> exported GEM bo. A further complication
+ * are the lookup caches for import and export. These are required to guarantee
+ * that any given object will always have only one uniqe userspace handle. This
+ * is required to allow userspace to detect duplicated imports, since some GEM
+ * drivers do fail command submissions if a given buffer object is listed more
+ * than once. These import and export caches in &drm_prime_file_private only
+ * retain a weak reference, which is cleaned up when the corresponding object is
+ * released.
+ *
+ * Self-importing: If userspace is using PRIME as a replacement for flink then
+ * it will get a fd->handle request for a GEM object that it created. Drivers
+ * should detect this situation and return back the underlying object from the
+ * dma-buf private. For GEM based drivers this is handled in
+ * drm_gem_prime_import() already.
*/

struct drm_prime_member {
@@ -220,7 +226,7 @@ void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv)
}

/**
- * drm_gem_dmabuf_export - dma_buf export implementation for GEM
+ * drm_gem_dmabuf_export - &dma_buf export implementation for GEM
* @dev: parent device for the exported dmabuf
* @exp_info: the export information used by dma_buf_export()
*
@@ -248,11 +254,11 @@ struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
EXPORT_SYMBOL(drm_gem_dmabuf_export);

/**
- * drm_gem_dmabuf_release - dma_buf release implementation for GEM
+ * 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.
+ * must use this in their &dma_buf_ops structure as the release callback.
* drm_gem_dmabuf_release() should be used in conjunction with
* drm_gem_dmabuf_export().
*/
@@ -278,7 +284,9 @@ EXPORT_SYMBOL(drm_gem_dmabuf_release);
* 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.
+ * &drm_driver.gem_prime_import driver callback.
+ *
+ * Returns 0 on success or a negative error code on failure.
*/
int drm_gem_prime_fd_to_handle(struct drm_device *dev,
struct drm_file *file_priv, int prime_fd,
@@ -412,7 +420,7 @@ static struct dma_buf *export_and_register_object(struct drm_device *dev,
* 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.
+ * &drm_driver.gem_prime_export driver callback.
*/
int drm_gem_prime_handle_to_fd(struct drm_device *dev,
struct drm_file *file_priv, uint32_t handle,
@@ -523,23 +531,39 @@ int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
/**
* DOC: PRIME Helpers
*
- * Drivers can implement @gem_prime_export and @gem_prime_import in terms of
- * simpler APIs by using the helper functions @drm_gem_prime_export and
- * @drm_gem_prime_import. These functions implement dma-buf support in terms of
- * six lower-level driver callbacks:
+ * Drivers can implement &drm_gem_object_funcs.export and
+ * &drm_driver.gem_prime_import in terms of simpler APIs by using the helper
+ * functions drm_gem_prime_export() and drm_gem_prime_import(). These functions
+ * implement dma-buf support in terms of some lower-level helpers, which are
+ * again exported for drivers to use individually:
+ *
+ * Exporting buffers
+ * ~~~~~~~~~~~~~~~~~
+ *
+ * Optional pinning of buffers is handled at dma-buf attach and detach time in
+ * drm_gem_map_attach() and drm_gem_map_detach(). Backing storage itself is
+ * handled by drm_gem_map_dma_buf() and drm_gem_unmap_dma_buf(), which relies on
+ * &drm_gem_object_funcs.get_sg_table.
+ *
+ * For kernel-internal access there's drm_gem_dmabuf_vmap() and
+ * drm_gem_dmabuf_vunmap(). Userspace mmap support is provided by
+ * drm_gem_dmabuf_mmap().
*
- * Export callbacks:
+ * Note that these export helpers can only be used if the underlying backing
+ * storage is fully coherent and either permanently pinned, or it is safe to pin
+ * it indefinitely.
*
- * * @gem_prime_pin (optional): prepare a GEM object for exporting
- * * @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages
- * * @gem_prime_vmap: vmap a buffer exported by your driver
- * * @gem_prime_vunmap: vunmap a buffer exported by your driver
- * * @gem_prime_mmap (optional): mmap a buffer exported by your driver
+ * FIXME: The underlying helper functions are named rather inconsistently.
*
- * Import callback:
+ * Exporting buffers
+ * ~~~~~~~~~~~~~~~~~
*
- * * @gem_prime_import_sg_table (import): produce a GEM object from another
- * driver's scatter/gather table
+ * Importing dma-bufs using drm_gem_prime_import() relies on
+ * &drm_driver.gem_prime_import_sg_table.
+ *
+ * Note that similarly to the export helpers this permanently pins the
+ * underlying backing storage. Which is ok for scanout, but is not the best
+ * option for sharing lots of buffers for rendering.
*/

/**
@@ -547,8 +571,9 @@ int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
* @dma_buf: buffer to attach device to
* @attach: buffer attachment data
*
- * Calls &drm_driver.gem_prime_pin for device specific handling. This can be
- * used as the &dma_buf_ops.attach callback.
+ * Calls &drm_gem_object_funcs.pin for device specific handling. This can be
+ * used as the &dma_buf_ops.attach callback. Must be used together with
+ * drm_gem_map_detach().
*
* Returns 0 on success, negative error code on failure.
*/
@@ -566,8 +591,9 @@ EXPORT_SYMBOL(drm_gem_map_attach);
* @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.
+ * Calls &drm_gem_object_funcs.pin for device specific handling. Cleans up
+ * &dma_buf_attachment from drm_gem_map_attach(). 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)
@@ -583,13 +609,13 @@ EXPORT_SYMBOL(drm_gem_map_detach);
* @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.
+ * Calls &drm_gem_object_funcs.get_sg_table and then maps the scatterlist. This
+ * can be used as the &dma_buf_ops.map_dma_buf callback. Should be used together
+ * with drm_gem_unmap_dma_buf().
*
- * Returns sg_table containing the scatterlist to be returned; returns ERR_PTR
+ * 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)
{
@@ -642,9 +668,9 @@ EXPORT_SYMBOL(drm_gem_unmap_dma_buf);
* @dma_buf: buffer to be mapped
*
* Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap
- * callback.
+ * callback. Calls into &drm_gem_object_funcs.vmap for device specific handling.
*
- * Returns the kernel virtual address.
+ * Returns the kernel virtual address or NULL on failure.
*/
void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
{
@@ -665,7 +691,7 @@ EXPORT_SYMBOL(drm_gem_dmabuf_vmap);
* @vaddr: the virtual address of the buffer
*
* Releases a kernel virtual mapping. This can be used as the
- * &dma_buf_ops.vunmap callback.
+ * &dma_buf_ops.vunmap callback. Calls into &drm_gem_object_funcs.vunmap for device specific handling.
*/
void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
{
@@ -727,7 +753,11 @@ EXPORT_SYMBOL(drm_gem_prime_mmap);
* @vma: virtual address range
*
* Provides memory mapping for the buffer. This can be used as the
- * &dma_buf_ops.mmap callback.
+ * &dma_buf_ops.mmap callback. It just forwards to &drm_driver.gem_prime_mmap,
+ * which should be set to drm_gem_prime_mmap().
+ *
+ * FIXME: There's really no point to this wrapper, drivers which need anything
+ * else but drm_gem_prime_mmap can roll their own &dma_buf_ops.mmap callback.
*
* Returns 0 on success or a negative error code on failure.
*/
@@ -763,6 +793,8 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
* 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 for use with dma_buf itself.
+ *
+ * This is useful for implementing &drm_gem_object_funcs.get_sg_table.
*/
struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_pages)
{
@@ -793,8 +825,9 @@ EXPORT_SYMBOL(drm_prime_pages_to_sg);
* @obj: GEM object to export
* @flags: flags like DRM_CLOEXEC and DRM_RDWR
*
- * This is the implementation of the gem_prime_export functions for GEM drivers
- * using the PRIME helpers.
+ * This is the implementation of the &drm_gem_object_funcs.export functions for GEM drivers
+ * using the PRIME helpers. It is used as the default in
+ * drm_gem_prime_handle_to_fd().
*/
struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj,
@@ -823,9 +856,13 @@ EXPORT_SYMBOL(drm_gem_prime_export);
* @dma_buf: dma-buf object to import
* @attach_dev: struct device to dma_buf attach
*
- * This is the core of drm_gem_prime_import. It's designed to be called by
- * drivers who want to use a different device structure than dev->dev for
- * attaching via dma_buf.
+ * This is the core of drm_gem_prime_import(). It's designed to be called by
+ * drivers who want to use a different device structure than &drm_device.dev for
+ * attaching via dma_buf. This function calls
+ * &drm_driver.gem_prime_import_sg_table internally.
+ *
+ * Drivers must arrange to call drm_prime_gem_destroy() from their
+ * &drm_gem_object_funcs.free hook when using this function.
*/
struct drm_gem_object *drm_gem_prime_import_dev(struct drm_device *dev,
struct dma_buf *dma_buf,
@@ -889,7 +926,12 @@ EXPORT_SYMBOL(drm_gem_prime_import_dev);
* @dma_buf: dma-buf object to import
*
* This is the implementation of the gem_prime_import functions for GEM drivers
- * using the PRIME helpers.
+ * using the PRIME helpers. Drivers can use this as their
+ * &drm_driver.gem_prime_import implementation. It is used as the default
+ * implementation in drm_gem_prime_fd_to_handle().
+ *
+ * Drivers must arrange to call drm_prime_gem_destroy() from their
+ * &drm_gem_object_funcs.free hook when using this function.
*/
struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
@@ -907,6 +949,9 @@ EXPORT_SYMBOL(drm_gem_prime_import);
*
* 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.
+ *
+ * Drivers can use this in their &drm_driver.gem_prime_import_sg_table
+ * implementation.
*/
int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
dma_addr_t *addrs, int max_entries)
@@ -947,7 +992,7 @@ EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays);
* @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.
+ * drm_gem_prime_import() or drm_gem_prime_import_dev() to import dma-bufs.
*/
void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg)
{
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index 5c4fc0ddc863..12e3aa7d7a9f 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -505,21 +505,25 @@ struct drm_driver {
* @gem_free_object: deconstructor for drm_gem_objects
*
* This is deprecated and should not be used by new drivers. Use
- * @gem_free_object_unlocked instead.
+ * &drm_gem_object_funcs.free instead.
*/
void (*gem_free_object) (struct drm_gem_object *obj);

/**
* @gem_free_object_unlocked: deconstructor for drm_gem_objects
*
- * This is for drivers which are not encumbered with &drm_device.struct_mutex
- * legacy locking schemes. Use this hook instead of @gem_free_object.
+ * This is deprecated and should not be used by new drivers. Use
+ * &drm_gem_object_funcs.free instead.
+ * Compared to @gem_free_object this is not encumbered with
+ * &drm_device.struct_mutex legacy locking schemes.
*/
void (*gem_free_object_unlocked) (struct drm_gem_object *obj);

/**
* @gem_open_object:
*
+ * This callback is deprecated in favour of &drm_gem_object_funcs.open.
+ *
* Driver hook called upon gem handle creation
*/
int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
@@ -527,6 +531,8 @@ struct drm_driver {
/**
* @gem_close_object:
*
+ * This callback is deprecated in favour of &drm_gem_object_funcs.close.
+ *
* Driver hook called upon gem handle release
*/
void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);
@@ -534,6 +540,9 @@ struct drm_driver {
/**
* @gem_print_info:
*
+ * This callback is deprecated in favour of
+ * &drm_gem_object_funcs.print_info.
+ *
* If driver subclasses struct &drm_gem_object, it can implement this
* optional hook for printing additional driver specific info.
*
@@ -548,56 +557,120 @@ struct drm_driver {
/**
* @gem_create_object: constructor for gem objects
*
- * Hook for allocating the GEM object struct, for use by core
- * helpers.
+ * Hook for allocating the GEM object struct, for use by the CMA and
+ * SHMEM GEM helpers.
*/
struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
size_t size);
-
- /* prime: */
/**
* @prime_handle_to_fd:
*
- * export handle -> fd (see drm_gem_prime_handle_to_fd() helper)
+ * Main PRIME export function. Should be implemented with
+ * drm_gem_prime_handle_to_fd() for GEM based drivers.
+ *
+ * For an in-depth discussion see :ref:`PRIME buffer sharing
+ * documentation <prime_buffer_sharing>`.
*/
int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
uint32_t handle, uint32_t flags, int *prime_fd);
/**
* @prime_fd_to_handle:
*
- * import fd -> handle (see drm_gem_prime_fd_to_handle() helper)
+ * Main PRIME import function. Should be implemented with
+ * drm_gem_prime_fd_to_handle() for GEM based drivers.
+ *
+ * For an in-depth discussion see :ref:`PRIME buffer sharing
+ * documentation <prime_buffer_sharing>`.
*/
int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
int prime_fd, uint32_t *handle);
/**
* @gem_prime_export:
*
- * export GEM -> dmabuf
- *
- * This defaults to drm_gem_prime_export() if not set.
+ * Export hook for GEM drivers. Deprecated in favour of
+ * &drm_gem_object_funcs.export.
*/
struct dma_buf * (*gem_prime_export)(struct drm_device *dev,
struct drm_gem_object *obj, int flags);
/**
* @gem_prime_import:
*
- * import dmabuf -> GEM
+ * Import hook for GEM drivers.
*
* This defaults to drm_gem_prime_import() if not set.
*/
struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
struct dma_buf *dma_buf);
+
+ /**
+ * @gem_prime_pin:
+ *
+ * Deprecated hook in favour of &drm_gem_object_funcs.pin.
+ */
int (*gem_prime_pin)(struct drm_gem_object *obj);
+
+ /**
+ * @gem_prime_unpin:
+ *
+ * Deprecated hook in favour of &drm_gem_object_funcs.unpin.
+ */
void (*gem_prime_unpin)(struct drm_gem_object *obj);
+
+
+ /**
+ * @gem_prime_get_sg_table:
+ *
+ * Deprecated hook in favour of &drm_gem_object_funcs.get_sg_table.
+ */
+ struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
+
+ /**
+ * @gem_prime_res_obj:
+ *
+ * Optional hook to look up the &reservation_object for an buffer when
+ * exporting it.
+ *
+ * FIXME: This hook is deprecated. Users of this hook should be replaced
+ * by setting &drm_gem_object.resv instead.
+ */
struct reservation_object * (*gem_prime_res_obj)(
struct drm_gem_object *obj);
- struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
+
+ /**
+ * @gem_prime_import_sg_table:
+ *
+ * Optional hook used by the PRIME helper functions
+ * drm_gem_prime_import() respectively drm_gem_prime_import_dev().
+ */
struct drm_gem_object *(*gem_prime_import_sg_table)(
struct drm_device *dev,
struct dma_buf_attachment *attach,
struct sg_table *sgt);
+ /**
+ * @gem_prime_vmap:
+ *
+ * Deprecated vmap hook for GEM drivers. Please use
+ * &drm_gem_object_funcs.vmap instead.
+ */
void *(*gem_prime_vmap)(struct drm_gem_object *obj);
+
+ /**
+ * @gem_prime_vunmap:
+ *
+ * Deprecated vunmap hook for GEM drivers. Please use
+ * &drm_gem_object_funcs.vunmap instead.
+ */
void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
+
+ /**
+ * @gem_prime_mmap:
+ *
+ * mmap hook for GEM drivers, used to implement dma-buf mmap in the
+ * PRIME helpers.
+ *
+ * FIXME: There's way too much duplication going on here, and also moved
+ * to &drm_gem_object_funcs.
+ */
int (*gem_prime_mmap)(struct drm_gem_object *obj,
struct vm_area_struct *vma);

@@ -665,6 +738,9 @@ struct drm_driver {

/**
* @gem_vm_ops: Driver private ops for this object
+ *
+ * For GEM drivers this is deprecated in favour of
+ * &drm_gem_object_funcs.vm_ops.
*/
const struct vm_operations_struct *gem_vm_ops;

diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index a9121fe66ea2..ae693c0666cd 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -101,7 +101,7 @@ struct drm_gem_object_funcs {
/**
* @pin:
*
- * Pin backing buffer in memory.
+ * Pin backing buffer in memory. Used by the drm_gem_map_attach() helper.
*
* This callback is optional.
*/
@@ -110,7 +110,7 @@ struct drm_gem_object_funcs {
/**
* @unpin:
*
- * Unpin backing buffer.
+ * Unpin backing buffer. Used by the drm_gem_map_detach() helper.
*
* This callback is optional.
*/
@@ -120,16 +120,21 @@ struct drm_gem_object_funcs {
* @get_sg_table:
*
* Returns a Scatter-Gather table representation of the buffer.
- * Used when exporting a buffer.
+ * Used when exporting a buffer by the drm_gem_map_dma_buf() helper.
+ * Releasing is done by calling dma_unmap_sg_attrs() and sg_free_table()
+ * in drm_gem_unmap_buf(), therefore these helpers and this callback
+ * here cannot be used for sg tables pointing at driver private memory
+ * ranges.
*
- * This callback is mandatory if buffer export is supported.
+ * See also drm_prime_pages_to_sg().
*/
struct sg_table *(*get_sg_table)(struct drm_gem_object *obj);

/**
* @vmap:
*
- * Returns a virtual address for the buffer.
+ * Returns a virtual address for the buffer. Used by the
+ * drm_gem_dmabuf_vmap() helper.
*
* This callback is optional.
*/
@@ -138,7 +143,8 @@ struct drm_gem_object_funcs {
/**
* @vunmap:
*
- * Releases the the address previously returned by @vmap.
+ * Releases the the address previously returned by @vmap. Used by the
+ * drm_gem_dmabuf_vunmap() helper.
*
* This callback is optional.
*/
--
2.20.1

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