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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;
- mutex_lock(&dev->mode_config.fb_lock);
- drm_for_each_fb(fb, dev)
- drm_fb_cma_describe(fb, m);
- mutex_unlock(&dev->mode_config.fb_lock);
- return 0;
- }
- EXPORT_SYMBOL_GPL(drm_fb_cma_debugfs_show);
- #endif
- static struct fb_ops drm_fbdev_cma_ops = {
- .owner = THIS_MODULE,
- .fb_fillrect = drm_fb_helper_sys_fillrect,
- .fb_copyarea = drm_fb_helper_sys_copyarea,
- .fb_imageblit = drm_fb_helper_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)
- {
- struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
- struct drm_mode_fb_cmd2 mode_cmd = { 0 };
- struct drm_device *dev = helper->dev;
- struct drm_gem_cma_object *obj;
- struct drm_framebuffer *fb;
- unsigned int bytes_per_pixel;
- unsigned long offset;
- struct fb_info *fbi;
- size_t size;
- int ret;
- DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
- sizes->surface_width, sizes->surface_height,
- sizes->surface_bpp);
- bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
- mode_cmd.width = sizes->surface_width;
- mode_cmd.height = sizes->surface_height;
- mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
- mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
- sizes->surface_depth);
- size = mode_cmd.pitches[0] * mode_cmd.height;
- obj = drm_gem_cma_create(dev, size);
- if (IS_ERR(obj))
- return -ENOMEM;
- fbi = drm_fb_helper_alloc_fbi(helper);
- if (IS_ERR(fbi)) {
- ret = PTR_ERR(fbi);
- goto err_drm_gem_cma_free_object;
- }
- fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1);
- if (IS_ERR(fbdev_cma->fb)) {
- dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
- ret = PTR_ERR(fbdev_cma->fb);
- goto err_fb_info_destroy;
- }
- fb = &fbdev_cma->fb->fb;
- helper->fb = fb;
- fbi->par = helper;
- fbi->flags = FBINFO_FLAG_DEFAULT;
- fbi->fbops = &drm_fbdev_cma_ops;
- drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
- drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
- offset = fbi->var.xoffset * bytes_per_pixel;
- offset += fbi->var.yoffset * fb->pitches[0];
- dev->mode_config.fb_base = (resource_size_t)obj->paddr;
- fbi->screen_base = obj->vaddr + offset;
- fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
- fbi->screen_size = size;
- fbi->fix.smem_len = size;
- return 0;
- err_fb_info_destroy:
- drm_fb_helper_release_fbi(helper);
- err_drm_gem_cma_free_object:
- drm_gem_cma_free_object(&obj->base);
- return ret;
- }
- static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
- .fb_probe = drm_fbdev_cma_create,
- };
- /**
- * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
- * @dev: DRM device
- * @preferred_bpp: Preferred bits per pixel for the device
- * @num_crtc: Number of CRTCs
- * @max_conn_count: Maximum number of connectors
- *
- * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
- */
- struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
- unsigned int preferred_bpp, unsigned int num_crtc,
- unsigned int max_conn_count)
- {
- struct drm_fbdev_cma *fbdev_cma;
- struct drm_fb_helper *helper;
- int ret;
- fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
- if (!fbdev_cma) {
- dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
- return ERR_PTR(-ENOMEM);
- }
- helper = &fbdev_cma->fb_helper;
- drm_fb_helper_prepare(dev, helper, &drm_fb_cma_helper_funcs);
- ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count);
- if (ret < 0) {
- dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
- goto err_free;
- }
- ret = drm_fb_helper_single_add_all_connectors(helper);
- if (ret < 0) {
- dev_err(dev->dev, "Failed to add connectors.\n");
- goto err_drm_fb_helper_fini;
- }
- /* disable all the possible outputs/crtcs before entering KMS mode */
- drm_helper_disable_unused_functions(dev);
- ret = drm_fb_helper_initial_config(helper, preferred_bpp);
- if (ret < 0) {
- dev_err(dev->dev, "Failed to set initial hw configuration.\n");
- goto err_drm_fb_helper_fini;
- }
- return fbdev_cma;
- err_drm_fb_helper_fini:
- drm_fb_helper_fini(helper);
- err_free:
- kfree(fbdev_cma);
- return ERR_PTR(ret);
- }
- EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
- /**
- * drm_fbdev_cma_fini() - Free drm_fbdev_cma struct
- * @fbdev_cma: The drm_fbdev_cma struct
- */
- void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
- {
- drm_fb_helper_unregister_fbi(&fbdev_cma->fb_helper);
- drm_fb_helper_release_fbi(&fbdev_cma->fb_helper);
- if (fbdev_cma->fb) {
- drm_framebuffer_unregister_private(&fbdev_cma->fb->fb);
- drm_fb_cma_destroy(&fbdev_cma->fb->fb);
- }
- drm_fb_helper_fini(&fbdev_cma->fb_helper);
- kfree(fbdev_cma);
- }
- EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini);
- /**
- * drm_fbdev_cma_restore_mode() - Restores initial framebuffer mode
- * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
- *
- * This function is usually called from the DRM drivers lastclose callback.
- */
- void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma)
- {
- if (fbdev_cma)
- drm_fb_helper_restore_fbdev_mode_unlocked(&fbdev_cma->fb_helper);
- }
- EXPORT_SYMBOL_GPL(drm_fbdev_cma_restore_mode);
- /**
- * drm_fbdev_cma_hotplug_event() - Poll for hotpulug events
- * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
- *
- * This function is usually called from the DRM drivers output_poll_changed
- * callback.
- */
- void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma)
- {
- if (fbdev_cma)
- drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper);
- }
- EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);
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