mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Noralf Trønnes](/assets/img/avatar_default.png)
This adds a .fb_create helper that sets the .dirty callback to drm_atomic_helper_dirtyfb(). v2: Improve docs (Daniel) Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190115043643.2364-2-noralf@tronnes.org
367 lines
11 KiB
C
367 lines
11 KiB
C
/*
|
|
* drm gem framebuffer helper functions
|
|
*
|
|
* Copyright (C) 2017 Noralf Trønnes
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/dma-buf.h>
|
|
#include <linux/dma-fence.h>
|
|
#include <linux/reservation.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <drm/drmP.h>
|
|
#include <drm/drm_atomic.h>
|
|
#include <drm/drm_atomic_uapi.h>
|
|
#include <drm/drm_damage_helper.h>
|
|
#include <drm/drm_fb_helper.h>
|
|
#include <drm/drm_fourcc.h>
|
|
#include <drm/drm_framebuffer.h>
|
|
#include <drm/drm_gem.h>
|
|
#include <drm/drm_gem_framebuffer_helper.h>
|
|
#include <drm/drm_modeset_helper.h>
|
|
#include <drm/drm_simple_kms_helper.h>
|
|
|
|
/**
|
|
* DOC: overview
|
|
*
|
|
* This library provides helpers for drivers that don't subclass
|
|
* &drm_framebuffer and use &drm_gem_object for their backing storage.
|
|
*
|
|
* Drivers without additional needs to validate framebuffers can simply use
|
|
* drm_gem_fb_create() and everything is wired up automatically. Other drivers
|
|
* can use all parts independently.
|
|
*/
|
|
|
|
/**
|
|
* drm_gem_fb_get_obj() - Get GEM object backing the framebuffer
|
|
* @fb: Framebuffer
|
|
* @plane: Plane index
|
|
*
|
|
* No additional reference is taken beyond the one that the &drm_frambuffer
|
|
* already holds.
|
|
*
|
|
* Returns:
|
|
* Pointer to &drm_gem_object for the given framebuffer and plane index or NULL
|
|
* if it does not exist.
|
|
*/
|
|
struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb,
|
|
unsigned int plane)
|
|
{
|
|
if (plane >= 4)
|
|
return NULL;
|
|
|
|
return fb->obj[plane];
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_fb_get_obj);
|
|
|
|
static struct drm_framebuffer *
|
|
drm_gem_fb_alloc(struct drm_device *dev,
|
|
const struct drm_mode_fb_cmd2 *mode_cmd,
|
|
struct drm_gem_object **obj, unsigned int num_planes,
|
|
const struct drm_framebuffer_funcs *funcs)
|
|
{
|
|
struct drm_framebuffer *fb;
|
|
int ret, i;
|
|
|
|
fb = kzalloc(sizeof(*fb), GFP_KERNEL);
|
|
if (!fb)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
|
|
|
|
for (i = 0; i < num_planes; i++)
|
|
fb->obj[i] = obj[i];
|
|
|
|
ret = drm_framebuffer_init(dev, fb, funcs);
|
|
if (ret) {
|
|
DRM_DEV_ERROR(dev->dev, "Failed to init framebuffer: %d\n",
|
|
ret);
|
|
kfree(fb);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return fb;
|
|
}
|
|
|
|
/**
|
|
* drm_gem_fb_destroy - Free GEM backed framebuffer
|
|
* @fb: Framebuffer
|
|
*
|
|
* Frees a GEM backed framebuffer with its backing buffer(s) and the structure
|
|
* itself. Drivers can use this as their &drm_framebuffer_funcs->destroy
|
|
* callback.
|
|
*/
|
|
void drm_gem_fb_destroy(struct drm_framebuffer *fb)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 4; i++)
|
|
drm_gem_object_put_unlocked(fb->obj[i]);
|
|
|
|
drm_framebuffer_cleanup(fb);
|
|
kfree(fb);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_fb_destroy);
|
|
|
|
/**
|
|
* drm_gem_fb_create_handle - Create handle for GEM backed framebuffer
|
|
* @fb: Framebuffer
|
|
* @file: DRM file to register the handle for
|
|
* @handle: Pointer to return the created handle
|
|
*
|
|
* This function creates a handle for the GEM object backing the framebuffer.
|
|
* Drivers can use this as their &drm_framebuffer_funcs->create_handle
|
|
* callback. The GETFB IOCTL calls into this callback.
|
|
*
|
|
* Returns:
|
|
* 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_gem_fb_create_handle(struct drm_framebuffer *fb, struct drm_file *file,
|
|
unsigned int *handle)
|
|
{
|
|
return drm_gem_handle_create(file, fb->obj[0], handle);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_fb_create_handle);
|
|
|
|
/**
|
|
* drm_gem_fb_create_with_funcs() - Helper function for the
|
|
* &drm_mode_config_funcs.fb_create
|
|
* callback
|
|
* @dev: DRM device
|
|
* @file: DRM file that holds the GEM handle(s) backing the framebuffer
|
|
* @mode_cmd: Metadata from the userspace framebuffer creation request
|
|
* @funcs: vtable to be used for the new framebuffer object
|
|
*
|
|
* This function can be used to set &drm_framebuffer_funcs for drivers that need
|
|
* custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
|
|
* change &drm_framebuffer_funcs. The function does buffer size validation.
|
|
*
|
|
* Returns:
|
|
* Pointer to a &drm_framebuffer on success or an error pointer on failure.
|
|
*/
|
|
struct drm_framebuffer *
|
|
drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file,
|
|
const struct drm_mode_fb_cmd2 *mode_cmd,
|
|
const struct drm_framebuffer_funcs *funcs)
|
|
{
|
|
const struct drm_format_info *info;
|
|
struct drm_gem_object *objs[4];
|
|
struct drm_framebuffer *fb;
|
|
int ret, i;
|
|
|
|
info = drm_get_format_info(dev, mode_cmd);
|
|
if (!info)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
for (i = 0; i < info->num_planes; i++) {
|
|
unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
|
|
unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
|
|
unsigned int min_size;
|
|
|
|
objs[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
|
|
if (!objs[i]) {
|
|
DRM_DEBUG_KMS("Failed to lookup GEM object\n");
|
|
ret = -ENOENT;
|
|
goto err_gem_object_put;
|
|
}
|
|
|
|
min_size = (height - 1) * mode_cmd->pitches[i]
|
|
+ drm_format_info_min_pitch(info, i, width)
|
|
+ mode_cmd->offsets[i];
|
|
|
|
if (objs[i]->size < min_size) {
|
|
drm_gem_object_put_unlocked(objs[i]);
|
|
ret = -EINVAL;
|
|
goto err_gem_object_put;
|
|
}
|
|
}
|
|
|
|
fb = drm_gem_fb_alloc(dev, mode_cmd, objs, i, funcs);
|
|
if (IS_ERR(fb)) {
|
|
ret = PTR_ERR(fb);
|
|
goto err_gem_object_put;
|
|
}
|
|
|
|
return fb;
|
|
|
|
err_gem_object_put:
|
|
for (i--; i >= 0; i--)
|
|
drm_gem_object_put_unlocked(objs[i]);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_funcs);
|
|
|
|
static const struct drm_framebuffer_funcs drm_gem_fb_funcs = {
|
|
.destroy = drm_gem_fb_destroy,
|
|
.create_handle = drm_gem_fb_create_handle,
|
|
};
|
|
|
|
/**
|
|
* drm_gem_fb_create() - Helper function for the
|
|
* &drm_mode_config_funcs.fb_create callback
|
|
* @dev: DRM device
|
|
* @file: DRM file that holds the GEM handle(s) backing the framebuffer
|
|
* @mode_cmd: Metadata from the userspace framebuffer creation request
|
|
*
|
|
* This function creates a new framebuffer object described by
|
|
* &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
|
|
* backing the framebuffer.
|
|
*
|
|
* If your hardware has special alignment or pitch requirements these should be
|
|
* checked before calling this function. The function does buffer size
|
|
* validation. Use drm_gem_fb_create_with_dirty() if you need framebuffer
|
|
* flushing.
|
|
*
|
|
* Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
|
|
* The ADDFB2 IOCTL calls into this callback.
|
|
*
|
|
* Returns:
|
|
* Pointer to a &drm_framebuffer on success or an error pointer on failure.
|
|
*/
|
|
struct drm_framebuffer *
|
|
drm_gem_fb_create(struct drm_device *dev, struct drm_file *file,
|
|
const struct drm_mode_fb_cmd2 *mode_cmd)
|
|
{
|
|
return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
|
|
&drm_gem_fb_funcs);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_fb_create);
|
|
|
|
static const struct drm_framebuffer_funcs drm_gem_fb_funcs_dirtyfb = {
|
|
.destroy = drm_gem_fb_destroy,
|
|
.create_handle = drm_gem_fb_create_handle,
|
|
.dirty = drm_atomic_helper_dirtyfb,
|
|
};
|
|
|
|
/**
|
|
* drm_gem_fb_create_with_dirty() - Helper function for the
|
|
* &drm_mode_config_funcs.fb_create callback
|
|
* @dev: DRM device
|
|
* @file: DRM file that holds the GEM handle(s) backing the framebuffer
|
|
* @mode_cmd: Metadata from the userspace framebuffer creation request
|
|
*
|
|
* This function creates a new framebuffer object described by
|
|
* &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
|
|
* backing the framebuffer. drm_atomic_helper_dirtyfb() is used for the dirty
|
|
* callback giving framebuffer flushing through the atomic machinery. Use
|
|
* drm_gem_fb_create() if you don't need the dirty callback.
|
|
* The function does buffer size validation.
|
|
*
|
|
* Drivers should also call drm_plane_enable_fb_damage_clips() on all planes
|
|
* to enable userspace to use damage clips also with the ATOMIC IOCTL.
|
|
*
|
|
* Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
|
|
* The ADDFB2 IOCTL calls into this callback.
|
|
*
|
|
* Returns:
|
|
* Pointer to a &drm_framebuffer on success or an error pointer on failure.
|
|
*/
|
|
struct drm_framebuffer *
|
|
drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file,
|
|
const struct drm_mode_fb_cmd2 *mode_cmd)
|
|
{
|
|
return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
|
|
&drm_gem_fb_funcs_dirtyfb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
|
|
|
|
/**
|
|
* drm_gem_fb_prepare_fb() - Prepare a GEM backed framebuffer
|
|
* @plane: Plane
|
|
* @state: Plane state the fence will be attached to
|
|
*
|
|
* This function prepares a GEM backed framebuffer for scanout by checking if
|
|
* the plane framebuffer has a DMA-BUF attached. If it does, it extracts the
|
|
* exclusive fence and attaches it to the plane state for the atomic helper to
|
|
* wait on. This function can be used as the &drm_plane_helper_funcs.prepare_fb
|
|
* callback.
|
|
*
|
|
* There is no need for &drm_plane_helper_funcs.cleanup_fb hook for simple
|
|
* gem based framebuffer drivers which have their buffers always pinned in
|
|
* memory.
|
|
*/
|
|
int drm_gem_fb_prepare_fb(struct drm_plane *plane,
|
|
struct drm_plane_state *state)
|
|
{
|
|
struct dma_buf *dma_buf;
|
|
struct dma_fence *fence;
|
|
|
|
if (!state->fb)
|
|
return 0;
|
|
|
|
dma_buf = drm_gem_fb_get_obj(state->fb, 0)->dma_buf;
|
|
if (dma_buf) {
|
|
fence = reservation_object_get_excl_rcu(dma_buf->resv);
|
|
drm_atomic_set_fence_for_plane(state, fence);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_fb_prepare_fb);
|
|
|
|
/**
|
|
* drm_gem_fb_simple_display_pipe_prepare_fb - prepare_fb helper for
|
|
* &drm_simple_display_pipe
|
|
* @pipe: Simple display pipe
|
|
* @plane_state: Plane state
|
|
*
|
|
* This function uses drm_gem_fb_prepare_fb() to check if the plane FB has a
|
|
* &dma_buf attached, extracts the exclusive fence and attaches it to plane
|
|
* state for the atomic helper to wait on. Drivers can use this as their
|
|
* &drm_simple_display_pipe_funcs.prepare_fb callback.
|
|
*/
|
|
int drm_gem_fb_simple_display_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
|
|
struct drm_plane_state *plane_state)
|
|
{
|
|
return drm_gem_fb_prepare_fb(&pipe->plane, plane_state);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_fb_simple_display_pipe_prepare_fb);
|
|
|
|
/**
|
|
* drm_gem_fbdev_fb_create - Create a GEM backed &drm_framebuffer for fbdev
|
|
* emulation
|
|
* @dev: DRM device
|
|
* @sizes: fbdev size description
|
|
* @pitch_align: Optional pitch alignment
|
|
* @obj: GEM object backing the framebuffer
|
|
* @funcs: Optional vtable to be used for the new framebuffer object when the
|
|
* dirty callback is needed.
|
|
*
|
|
* This function creates a framebuffer from a &drm_fb_helper_surface_size
|
|
* description for use in the &drm_fb_helper_funcs.fb_probe callback.
|
|
*
|
|
* Returns:
|
|
* Pointer to a &drm_framebuffer on success or an error pointer on failure.
|
|
*/
|
|
struct drm_framebuffer *
|
|
drm_gem_fbdev_fb_create(struct drm_device *dev,
|
|
struct drm_fb_helper_surface_size *sizes,
|
|
unsigned int pitch_align, struct drm_gem_object *obj,
|
|
const struct drm_framebuffer_funcs *funcs)
|
|
{
|
|
struct drm_mode_fb_cmd2 mode_cmd = { 0 };
|
|
|
|
mode_cmd.width = sizes->surface_width;
|
|
mode_cmd.height = sizes->surface_height;
|
|
mode_cmd.pitches[0] = sizes->surface_width *
|
|
DIV_ROUND_UP(sizes->surface_bpp, 8);
|
|
if (pitch_align)
|
|
mode_cmd.pitches[0] = roundup(mode_cmd.pitches[0],
|
|
pitch_align);
|
|
mode_cmd.pixel_format = drm_driver_legacy_fb_format(dev, sizes->surface_bpp,
|
|
sizes->surface_depth);
|
|
if (obj->size < mode_cmd.pitches[0] * mode_cmd.height)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!funcs)
|
|
funcs = &drm_gem_fb_funcs;
|
|
|
|
return drm_gem_fb_alloc(dev, &mode_cmd, &obj, 1, funcs);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_fbdev_fb_create);
|