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|
/*
* drm kms/fb cma (contiguous memory allocator) helper functions
*
* Copyright (C) 2012 Analog Device Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
*
* Based on udl_fbdev.c
* Copyright (C) 2012 Red Hat
*
* 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.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <linux/module.h>
struct drm_fb_cma {
struct drm_framebuffer fb;
struct drm_gem_cma_object *obj[4];
};
struct drm_fbdev_cma {
struct drm_fb_helper fb_helper;
struct drm_fb_cma *fb;
};
static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
{
return container_of(helper, struct drm_fbdev_cma, fb_helper);
}
static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb)
{
return container_of(fb, struct drm_fb_cma, fb);
}
static void drm_fb_cma_destroy(struct drm_framebuffer *fb)
{
struct drm_fb_cma *fb_cma = to_fb_cma(fb);
int i;
for (i = 0; i < 4; i++) {
if (fb_cma->obj[i])
drm_gem_object_unreference_unlocked(&fb_cma->obj[i]->base);
}
drm_framebuffer_cleanup(fb);
kfree(fb_cma);
}
static int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
struct drm_file *file_priv, unsigned int *handle)
{
struct drm_fb_cma *fb_cma = to_fb_cma(fb);
return drm_gem_handle_create(file_priv,
&fb_cma->obj[0]->base, handle);
}
static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
.destroy = drm_fb_cma_destroy,
.create_handle = drm_fb_cma_create_handle,
};
static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_cma_object **obj,
unsigned int num_planes)
{
struct drm_fb_cma *fb_cma;
int ret;
int i;
fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
if (!fb_cma)
return ERR_PTR(-ENOMEM);
drm_helper_mode_fill_fb_struct(&fb_cma->fb, mode_cmd);
for (i = 0; i < num_planes; i++)
fb_cma->obj[i] = obj[i];
ret = drm_framebuffer_init(dev, &fb_cma->fb, &drm_fb_cma_funcs);
if (ret) {
dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
kfree(fb_cma);
return ERR_PTR(ret);
}
return fb_cma;
}
/**
* drm_fb_cma_create() - (struct drm_mode_config_funcs *)->fb_create callback function
*
* If your hardware has special alignment or pitch requirements these should be
* checked before calling this function.
*/
struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
{
struct drm_fb_cma *fb_cma;
struct drm_gem_cma_object *objs[4];
struct drm_gem_object *obj;
unsigned int hsub;
unsigned int vsub;
int ret;
int i;
hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
unsigned int width = mode_cmd->width / (i ? hsub : 1);
unsigned int height = mode_cmd->height / (i ? vsub : 1);
unsigned int min_size;
obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[i]);
if (!obj) {
dev_err(dev->dev, "Failed to lookup GEM object\n");
ret = -ENXIO;
goto err_gem_object_unreference;
}
min_size = (height - 1) * mode_cmd->pitches[i]
+ width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
+ mode_cmd->offsets[i];
if (obj->size < min_size) {
drm_gem_object_unreference_unlocked(obj);
ret = -EINVAL;
goto err_gem_object_unreference;
}
objs[i] = to_drm_gem_cma_obj(obj);
}
fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i);
if (IS_ERR(fb_cma)) {
ret = PTR_ERR(fb_cma);
goto err_gem_object_unreference;
}
return &fb_cma->fb;
err_gem_object_unreference:
for (i--; i >= 0; i--)
drm_gem_object_unreference_unlocked(&objs[i]->base);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(drm_fb_cma_create);
/**
* drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
* @fb: The framebuffer
* @plane: Which plane
*
* Return the CMA GEM object for given framebuffer.
*
* This function will usually be called from the CRTC callback functions.
*/
struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
unsigned int plane)
{
struct drm_fb_cma *fb_cma = to_fb_cma(fb);
if (plane >= 4)
return NULL;
return fb_cma->obj[plane];
}
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
#ifdef CONFIG_DEBUG_FS
/*
* drm_fb_cma_describe() - Helper to dump information about a single
* CMA framebuffer object
*/
static void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
{
struct drm_fb_cma *fb_cma = to_fb_cma(fb);
int i, n = drm_format_num_planes(fb->pixel_format);
seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
(char *)&fb->pixel_format);
for (i = 0; i < n; i++) {
seq_printf(m, " %d: offset=%d pitch=%d, obj: ",
i, fb->offsets[i], fb->pitches[i]);
drm_gem_cma_describe(fb_cma->obj[i], m);
}
}
/**
* drm_fb_cma_debugfs_show() - Helper to list CMA framebuffer objects
* in debugfs.
*/
int drm_fb_cma_debugfs_show(struct seq_file *m, void *arg)
{
struct drm_info_node *node = (struct drm_info_node *) m->private;
struct drm_device *dev = node->minor->dev;
struct drm_framebuffer *fb;
int ret;
ret = mutex_lock_interruptible(&dev->mode_config.mutex);
if (ret)
return ret;
ret = mutex_lock_interruptible(&dev->struct_mutex);
if (ret) {
mutex_unlock(&dev->mode_config.mutex);
return ret;
}
list_for_each_entry(fb, &dev->mode_config.fb_list, head)
drm_fb_cma_describe(fb, m);
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&dev->mode_config.mutex);
return 0;
}
EXPORT_SYMBOL_GPL(drm_fb_cma_debugfs_show);
#endif
static struct fb_ops drm_fbdev_cma_ops = {
.owner = THIS_MODULE,
.fb_fillrect = sys_fillrect,
.fb_copyarea = sys_copyarea,
.fb_imageblit = sys_imageblit,
.fb_check_var = drm_fb_helper_check_var,
.fb_set_par = drm_fb_helper_set_par,
.fb_blank = drm_fb_helper_blank,
.fb_pan_display = drm_fb_helper_pan_display,
.fb_setcmap = drm_fb_helper_setcmap,
};
static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
struct drm_fb_helper_surface_size *sizes)
|