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drm/doc: Polish for drm_plane.[hc]
Big thing is untangling and carefully documenting the different uapi types of planes. I also sprinkled a few more cross references around to make this easier to discover. As usual, remove the kerneldoc for internal functions which are not exported. Aside: We should probably go OCD on all the ioctl handlers and consistenly give them an _ioctl postfix. Acked-by: Archit Taneja <architt@codeaurora.org> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Signed-off-by: Sean Paul <seanpaul@chromium.org> Link: http://patchwork.freedesktop.org/patch/msgid/1474448370-32227-2-git-send-email-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter
Sean Paul
parent
43968d7b80
commit
532b36712d
4 changed files with 86 additions and 156 deletions
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@ -113,6 +113,9 @@ a hardware-specific ioctl to allocate suitable buffer objects.
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Plane Abstraction
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=================
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.. kernel-doc:: drivers/gpu/drm/drm_plane.c
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:doc: overview
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Plane Functions Reference
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-------------------------
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@ -189,50 +192,6 @@ allocated and zeroed by the driver, possibly as part of a larger
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structure, and registered with a call to :c:func:`drm_crtc_init()`
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with a pointer to CRTC functions.
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Planes (:c:type:`struct drm_plane <drm_plane>`)
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-----------------------------------------------
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A plane represents an image source that can be blended with or overlayed
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on top of a CRTC during the scanout process. Planes are associated with
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a frame buffer to crop a portion of the image memory (source) and
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optionally scale it to a destination size. The result is then blended
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with or overlayed on top of a CRTC.
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The DRM core recognizes three types of planes:
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- DRM_PLANE_TYPE_PRIMARY represents a "main" plane for a CRTC.
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Primary planes are the planes operated upon by CRTC modesetting and
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flipping operations described in the page_flip hook in
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:c:type:`struct drm_crtc_funcs <drm_crtc_funcs>`.
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- DRM_PLANE_TYPE_CURSOR represents a "cursor" plane for a CRTC.
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Cursor planes are the planes operated upon by the
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DRM_IOCTL_MODE_CURSOR and DRM_IOCTL_MODE_CURSOR2 ioctls.
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- DRM_PLANE_TYPE_OVERLAY represents all non-primary, non-cursor
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planes. Some drivers refer to these types of planes as "sprites"
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internally.
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For compatibility with legacy userspace, only overlay planes are made
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available to userspace by default. Userspace clients may set the
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DRM_CLIENT_CAP_UNIVERSAL_PLANES client capability bit to indicate
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that they wish to receive a universal plane list containing all plane
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types.
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Plane Initialization
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~~~~~~~~~~~~~~~~~~~~
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To create a plane, a KMS drivers allocates and zeroes an instances of
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:c:type:`struct drm_plane <drm_plane>` (possibly as part of a
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larger structure) and registers it with a call to
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:c:func:`drm_universal_plane_init()`. The function takes a
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bitmask of the CRTCs that can be associated with the plane, a pointer to
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the plane functions, a list of format supported formats, and the type of
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plane (primary, cursor, or overlay) being initialized.
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Cursor and overlay planes are optional. All drivers should provide one
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primary plane per CRTC (although this requirement may change in the
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future); drivers that do not wish to provide special handling for
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primary planes may make use of the helper functions described in ? to
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create and register a primary plane with standard capabilities.
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Cleanup
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-------
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@ -151,7 +151,11 @@ static void drm_crtc_unregister_all(struct drm_device *dev)
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* @funcs: callbacks for the new CRTC
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* @name: printf style format string for the CRTC name, or NULL for default name
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*
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* Inits a new object created as base part of a driver crtc object.
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* Inits a new object created as base part of a driver crtc object. Drivers
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* should use this function instead of drm_crtc_init(), which is only provided
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* for backwards compatibility with drivers which do not yet support universal
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* planes). For really simple hardware which has only 1 plane look at
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* drm_simple_display_pipe_init() instead.
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*
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* Returns:
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* Zero on success, error code on failure.
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@ -25,6 +25,28 @@
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#include "drm_crtc_internal.h"
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/**
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* DOC: overview
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*
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* A plane represents an image source that can be blended with or overlayed on
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* top of a CRTC during the scanout process. Planes take their input data from a
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* &drm_framebuffer object. The plane itself specifies the cropping and scaling
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* of that image, and where it is placed on the visible are of a display
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* pipeline, represented by &drm_crtc. A plane can also have additional
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* properties that specify how the pixels are positioned and blended, like
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* rotation or Z-position. All these properties are stored in &drm_plane_state.
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*
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* To create a plane, a KMS drivers allocates and zeroes an instances of
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* struct &drm_plane (possibly as part of a larger structure) and registers it
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* with a call to drm_universal_plane_init().
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*
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* Cursor and overlay planes are optional. All drivers should provide one
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* primary plane per CRTC to avoid surprising userspace too much. See enum
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* &drm_plane_type for a more in-depth discussion of these special uapi-relevant
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* plane types. Special planes are associated with their CRTC by calling
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* drm_crtc_init_with_planes().
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*/
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static unsigned int drm_num_planes(struct drm_device *dev)
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{
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unsigned int num = 0;
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@ -303,19 +325,6 @@ int drm_mode_plane_set_obj_prop(struct drm_plane *plane,
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}
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EXPORT_SYMBOL(drm_mode_plane_set_obj_prop);
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/**
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* drm_mode_getplane_res - enumerate all plane resources
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* @dev: DRM device
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* @data: ioctl data
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* @file_priv: DRM file info
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*
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* Construct a list of plane ids to return to the user.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_getplane_res(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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@ -364,19 +373,6 @@ int drm_mode_getplane_res(struct drm_device *dev, void *data,
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return 0;
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}
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/**
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* drm_mode_getplane - get plane configuration
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* @dev: DRM device
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* @data: ioctl data
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* @file_priv: DRM file info
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*
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* Construct a plane configuration structure to return to the user.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_getplane(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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@ -425,15 +421,6 @@ int drm_mode_getplane(struct drm_device *dev, void *data,
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return 0;
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}
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/**
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* drm_plane_check_pixel_format - Check if the plane supports the pixel format
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* @plane: plane to check for format support
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* @format: the pixel format
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*
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* Returns:
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* Zero of @plane has @format in its list of supported pixel formats, -EINVAL
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* otherwise.
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*/
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int drm_plane_check_pixel_format(const struct drm_plane *plane, u32 format)
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{
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unsigned int i;
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@ -552,19 +539,6 @@ static int setplane_internal(struct drm_plane *plane,
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return ret;
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}
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/**
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* drm_mode_setplane - configure a plane's configuration
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* @dev: DRM device
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* @data: ioctl data*
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* @file_priv: DRM file info
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*
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* Set plane configuration, including placement, fb, scaling, and other factors.
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* Or pass a NULL fb to disable (planes may be disabled without providing a
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* valid crtc).
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_setplane(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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@ -614,25 +588,6 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
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plane_req->src_w, plane_req->src_h);
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}
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/**
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* drm_mode_cursor_universal - translate legacy cursor ioctl call into a
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* universal plane handler call
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* @crtc: crtc to update cursor for
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* @req: data pointer for the ioctl
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* @file_priv: drm file for the ioctl call
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*
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* Legacy cursor ioctl's work directly with driver buffer handles. To
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* translate legacy ioctl calls into universal plane handler calls, we need to
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* wrap the native buffer handle in a drm_framebuffer.
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*
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* Note that we assume any handle passed to the legacy ioctls was a 32-bit ARGB
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* buffer with a pitch of 4*width; the universal plane interface should be used
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* directly in cases where the hardware can support other buffer settings and
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* userspace wants to make use of these capabilities.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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static int drm_mode_cursor_universal(struct drm_crtc *crtc,
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struct drm_mode_cursor2 *req,
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struct drm_file *file_priv)
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@ -768,19 +723,6 @@ static int drm_mode_cursor_common(struct drm_device *dev,
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}
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/**
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* drm_mode_cursor_ioctl - set CRTC's cursor configuration
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* @dev: drm device for the ioctl
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* @data: data pointer for the ioctl
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* @file_priv: drm file for the ioctl call
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*
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* Set the cursor configuration based on user request.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_cursor_ioctl(struct drm_device *dev,
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void *data, struct drm_file *file_priv)
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{
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@ -793,20 +735,10 @@ int drm_mode_cursor_ioctl(struct drm_device *dev,
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return drm_mode_cursor_common(dev, &new_req, file_priv);
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}
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/**
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* drm_mode_cursor2_ioctl - set CRTC's cursor configuration
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* @dev: drm device for the ioctl
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* @data: data pointer for the ioctl
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* @file_priv: drm file for the ioctl call
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*
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/*
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* Set the cursor configuration based on user request. This implements the 2nd
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* version of the cursor ioctl, which allows userspace to additionally specify
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* the hotspot of the pointer.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_cursor2_ioctl(struct drm_device *dev,
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void *data, struct drm_file *file_priv)
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@ -816,24 +748,6 @@ int drm_mode_cursor2_ioctl(struct drm_device *dev,
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return drm_mode_cursor_common(dev, req, file_priv);
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}
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/**
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* drm_mode_page_flip_ioctl - schedule an asynchronous fb update
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* @dev: DRM device
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* @data: ioctl data
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* @file_priv: DRM file info
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*
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* This schedules an asynchronous update on a given CRTC, called page flip.
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* Optionally a drm event is generated to signal the completion of the event.
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* Generic drivers cannot assume that a pageflip with changed framebuffer
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* properties (including driver specific metadata like tiling layout) will work,
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* but some drivers support e.g. pixel format changes through the pageflip
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* ioctl.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_page_flip_ioctl(struct drm_device *dev,
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void *data, struct drm_file *file_priv)
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{
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@ -319,10 +319,48 @@ struct drm_plane_funcs {
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void (*early_unregister)(struct drm_plane *plane);
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};
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/**
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* enum drm_plane_type - uapi plane type enumeration
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*
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* For historical reasons not all planes are made the same. This enumeration is
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* used to tell the different types of planes apart to implement the different
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* uapi semantics for them. For userspace which is universal plane aware and
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* which is using that atomic IOCTL there's no difference between these planes
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* (beyong what the driver and hardware can support of course).
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*
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* For compatibility with legacy userspace, only overlay planes are made
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* available to userspace by default. Userspace clients may set the
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* DRM_CLIENT_CAP_UNIVERSAL_PLANES client capability bit to indicate that they
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* wish to receive a universal plane list containing all plane types. See also
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* drm_for_each_legacy_plane().
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*/
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enum drm_plane_type {
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DRM_PLANE_TYPE_OVERLAY,
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/**
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* @DRM_PLANE_TYPE_PRIMARY:
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*
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* Primary planes represent a "main" plane for a CRTC. Primary planes
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* are the planes operated upon by CRTC modesetting and flipping
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* operations described in the page_flip and set_config hooks in struct
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* &drm_crtc_funcs.
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*/
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DRM_PLANE_TYPE_PRIMARY,
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/**
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* @DRM_PLANE_TYPE_CURSOR:
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*
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* Cursor planes represent a "cursor" plane for a CRTC. Cursor planes
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* are the planes operated upon by the DRM_IOCTL_MODE_CURSOR and
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* DRM_IOCTL_MODE_CURSOR2 IOCTLs.
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*/
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DRM_PLANE_TYPE_CURSOR,
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/**
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* @DRM_PLANE_TYPE_OVERLAY:
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*
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* Overlay planes represent all non-primary, non-cursor planes. Some
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* drivers refer to these types of planes as "sprites" internally.
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*/
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DRM_PLANE_TYPE_OVERLAY,
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};
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@ -458,11 +496,26 @@ static inline struct drm_plane *drm_plane_find(struct drm_device *dev,
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list_for_each_entry((plane), &(dev)->mode_config.plane_list, head) \
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for_each_if ((plane_mask) & (1 << drm_plane_index(plane)))
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/* Plane list iterator for legacy (overlay only) planes. */
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/**
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* drm_for_each_legacy_plane - iterate over all planes for legacy userspace
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* @plane: the loop cursor
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* @dev: the DRM device
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*
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* Iterate over all legacy planes of @dev, excluding primary and cursor planes.
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* This is useful for implementing userspace apis when userspace is not
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* universal plane aware. See also enum &drm_plane_type.
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*/
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#define drm_for_each_legacy_plane(plane, dev) \
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list_for_each_entry(plane, &(dev)->mode_config.plane_list, head) \
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for_each_if (plane->type == DRM_PLANE_TYPE_OVERLAY)
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/**
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* drm_for_each_plane - iterate over all planes
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* @plane: the loop cursor
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* @dev: the DRM device
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*
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* Iterate over all planes of @dev, include primary and cursor planes.
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*/
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#define drm_for_each_plane(plane, dev) \
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list_for_each_entry(plane, &(dev)->mode_config.plane_list, head)
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