drm/doc: Drop :c:func: markup

Kernel sphinx has learned how to do that in

commit d74b0d31dd
Author: Jonathan Corbet <corbet@lwn.net>
Date:   Thu Apr 25 07:55:07 2019 -0600

    Docs: An initial automarkup extension for sphinx

Unfortunately it hasn't learned that yet for structures, so we're
stuck with the :c:type: noise for now still.

Reviewed-by: Thierry Reding <treding@nvidia.com>
Cc:  Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191204101933.861169-1-daniel.vetter@ffwll.ch

Documentation/gpu/drm-internals.rst

@@ -24,9 +24,9 @@ Driver Initialization
 At the core of every DRM driver is a :c:type:`struct drm_driver
 <drm_driver>` structure. Drivers typically statically initialize
 a drm_driver structure, and then pass it to
-:c:func:`drm_dev_alloc()` to allocate a device instance. After the
+drm_dev_alloc() to allocate a device instance. After the
 device instance is fully initialized it can be registered (which makes
-it accessible from userspace) using :c:func:`drm_dev_register()`.
+it accessible from userspace) using drm_dev_register().
 
 The :c:type:`struct drm_driver <drm_driver>` structure
 contains static information that describes the driver and features it

Documentation/gpu/drm-kms.rst

@@ -3,7 +3,7 @@ Kernel Mode Setting (KMS)
 =========================
 
 Drivers must initialize the mode setting core by calling
-:c:func:`drm_mode_config_init()` on the DRM device. The function
+drm_mode_config_init() on the DRM device. The function
 initializes the :c:type:`struct drm_device <drm_device>`
 mode_config field and never fails. Once done, mode configuration must
 be setup by initializing the following fields.
@@ -181,8 +181,7 @@ Setting`_). The somewhat surprising part here is that properties are not
 directly instantiated on each object, but free-standing mode objects themselves,
 represented by :c:type:`struct drm_property <drm_property>`, which only specify
 the type and value range of a property. Any given property can be attached
-multiple times to different objects using :c:func:`drm_object_attach_property()
+multiple times to different objects using drm_object_attach_property().
-<drm_object_attach_property>`.
 
 .. kernel-doc:: include/drm/drm_mode_object.h
    :internal:
@@ -274,7 +273,7 @@ Locking of atomic state structures is internally using :c:type:`struct
 drm_modeset_lock <drm_modeset_lock>`. As a general rule the locking shouldn't be
 exposed to drivers, instead the right locks should be automatically acquired by
 any function that duplicates or peeks into a state, like e.g.
-:c:func:`drm_atomic_get_crtc_state()`.  Locking only protects the software data
+drm_atomic_get_crtc_state().  Locking only protects the software data
 structure, ordering of committing state changes to hardware is sequenced using
 :c:type:`struct drm_crtc_commit <drm_crtc_commit>`.
 

Documentation/gpu/drm-mm.rst

@@ -149,19 +149,19 @@ struct :c:type:`struct drm_gem_object <drm_gem_object>`.
 To create a GEM object, a driver allocates memory for an instance of its
 specific GEM object type and initializes the embedded struct
 :c:type:`struct drm_gem_object <drm_gem_object>` with a call
-to :c:func:`drm_gem_object_init()`. The function takes a pointer
+to drm_gem_object_init(). The function takes a pointer
 to the DRM device, a pointer to the GEM object and the buffer object
 size in bytes.
 
 GEM uses shmem to allocate anonymous pageable memory.
-:c:func:`drm_gem_object_init()` will create an shmfs file of the
+drm_gem_object_init() will create an shmfs file of the
 requested size and store it into the struct :c:type:`struct
 drm_gem_object <drm_gem_object>` filp field. The memory is
 used as either main storage for the object when the graphics hardware
 uses system memory directly or as a backing store otherwise.
 
 Drivers are responsible for the actual physical pages allocation by
-calling :c:func:`shmem_read_mapping_page_gfp()` for each page.
+calling shmem_read_mapping_page_gfp() for each page.
 Note that they can decide to allocate pages when initializing the GEM
 object, or to delay allocation until the memory is needed (for instance
 when a page fault occurs as a result of a userspace memory access or
@@ -170,20 +170,18 @@ when the driver needs to start a DMA transfer involving the memory).
 Anonymous pageable memory allocation is not always desired, for instance
 when the hardware requires physically contiguous system memory as is
 often the case in embedded devices. Drivers can create GEM objects with
-no shmfs backing (called private GEM objects) by initializing them with
+no shmfs backing (called private GEM objects) by initializing them with a call
-a call to :c:func:`drm_gem_private_object_init()` instead of
+to drm_gem_private_object_init() instead of drm_gem_object_init(). Storage for
-:c:func:`drm_gem_object_init()`. Storage for private GEM objects
+private GEM objects must be managed by drivers.
-must be managed by drivers.
 
 GEM Objects Lifetime
 --------------------
 
 All GEM objects are reference-counted by the GEM core. References can be
-acquired and release by :c:func:`calling drm_gem_object_get()` and
+acquired and release by calling drm_gem_object_get() and drm_gem_object_put()
-:c:func:`drm_gem_object_put()` respectively. The caller must hold the
+respectively. The caller must hold the :c:type:`struct drm_device <drm_device>`
-:c:type:`struct drm_device <drm_device>` struct_mutex lock when calling
+struct_mutex lock when calling drm_gem_object_get(). As a convenience, GEM
-:c:func:`drm_gem_object_get()`. As a convenience, GEM provides
+provides drm_gem_object_put_unlocked() functions that can be called without
-:c:func:`drm_gem_object_put_unlocked()` functions that can be called without
 holding the lock.
 
 When the last reference to a GEM object is released the GEM core calls
@@ -194,7 +192,7 @@ free the GEM object and all associated resources.
 void (\*gem_free_object) (struct drm_gem_object \*obj); Drivers are
 responsible for freeing all GEM object resources. This includes the
 resources created by the GEM core, which need to be released with
-:c:func:`drm_gem_object_release()`.
+drm_gem_object_release().
 
 GEM Objects Naming
 ------------------
@@ -210,13 +208,11 @@ to the GEM object in other standard or driver-specific ioctls. Closing a
 DRM file handle frees all its GEM handles and dereferences the
 associated GEM objects.
 
-To create a handle for a GEM object drivers call
+To create a handle for a GEM object drivers call drm_gem_handle_create(). The
-:c:func:`drm_gem_handle_create()`. The function takes a pointer
+function takes a pointer to the DRM file and the GEM object and returns a
-to the DRM file and the GEM object and returns a locally unique handle.
+locally unique handle.  When the handle is no longer needed drivers delete it
-When the handle is no longer needed drivers delete it with a call to
+with a call to drm_gem_handle_delete(). Finally the GEM object associated with a
-:c:func:`drm_gem_handle_delete()`. Finally the GEM object
+handle can be retrieved by a call to drm_gem_object_lookup().
-associated with a handle can be retrieved by a call to
-:c:func:`drm_gem_object_lookup()`.
 
 Handles don't take ownership of GEM objects, they only take a reference
 to the object that will be dropped when the handle is destroyed. To
@@ -258,7 +254,7 @@ The mmap system call can't be used directly to map GEM objects, as they
 don't have their own file handle. Two alternative methods currently
 co-exist to map GEM objects to userspace. The first method uses a
 driver-specific ioctl to perform the mapping operation, calling
-:c:func:`do_mmap()` under the hood. This is often considered
+do_mmap() under the hood. This is often considered
 dubious, seems to be discouraged for new GEM-enabled drivers, and will
 thus not be described here.
 
@@ -267,23 +263,22 @@ The second method uses the mmap system call on the DRM file handle. void
 offset); DRM identifies the GEM object to be mapped by a fake offset
 passed through the mmap offset argument. Prior to being mapped, a GEM
 object must thus be associated with a fake offset. To do so, drivers
-must call :c:func:`drm_gem_create_mmap_offset()` on the object.
+must call drm_gem_create_mmap_offset() on the object.
 
 Once allocated, the fake offset value must be passed to the application
 in a driver-specific way and can then be used as the mmap offset
 argument.
 
-The GEM core provides a helper method :c:func:`drm_gem_mmap()` to
+The GEM core provides a helper method drm_gem_mmap() to
 handle object mapping. The method can be set directly as the mmap file
 operation handler. It will look up the GEM object based on the offset
 value and set the VMA operations to the :c:type:`struct drm_driver
-<drm_driver>` gem_vm_ops field. Note that
+<drm_driver>` gem_vm_ops field. Note that drm_gem_mmap() doesn't map memory to
-:c:func:`drm_gem_mmap()` doesn't map memory to userspace, but
+userspace, but relies on the driver-provided fault handler to map pages
-relies on the driver-provided fault handler to map pages individually.
+individually.
 
-To use :c:func:`drm_gem_mmap()`, drivers must fill the struct
+To use drm_gem_mmap(), drivers must fill the struct :c:type:`struct drm_driver
-:c:type:`struct drm_driver <drm_driver>` gem_vm_ops field
+<drm_driver>` gem_vm_ops field with a pointer to VM operations.
-with a pointer to VM operations.
 
 The VM operations is a :c:type:`struct vm_operations_struct <vm_operations_struct>`
 made up of several fields, the more interesting ones being:
@@ -298,9 +293,8 @@ made up of several fields, the more interesting ones being:
 
 
 The open and close operations must update the GEM object reference
-count. Drivers can use the :c:func:`drm_gem_vm_open()` and
+count. Drivers can use the drm_gem_vm_open() and drm_gem_vm_close() helper
-:c:func:`drm_gem_vm_close()` helper functions directly as open
+functions directly as open and close handlers.
-and close handlers.
 
 The fault operation handler is responsible for mapping individual pages
 to userspace when a page fault occurs. Depending on the memory
@@ -312,12 +306,12 @@ Drivers that want to map the GEM object upfront instead of handling page
 faults can implement their own mmap file operation handler.
 
 For platforms without MMU the GEM core provides a helper method
-:c:func:`drm_gem_cma_get_unmapped_area`. The mmap() routines will call
+drm_gem_cma_get_unmapped_area(). The mmap() routines will call this to get a
-this to get a proposed address for the mapping.
+proposed address for the mapping.
 
-To use :c:func:`drm_gem_cma_get_unmapped_area`, drivers must fill the
+To use drm_gem_cma_get_unmapped_area(), drivers must fill the struct
-struct :c:type:`struct file_operations <file_operations>` get_unmapped_area
+:c:type:`struct file_operations <file_operations>` get_unmapped_area field with
-field with a pointer on :c:func:`drm_gem_cma_get_unmapped_area`.
+a pointer on drm_gem_cma_get_unmapped_area().
 
 More detailed information about get_unmapped_area can be found in
 Documentation/nommu-mmap.txt