--- /dev/null
+/*
+ * 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)
+{
+ 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 = framebuffer_alloc(0, dev->dev);
+ if (!fbi) {
+ dev_err(dev->dev, "Failed to allocate framebuffer info.\n");
+ ret = -ENOMEM;
+ 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_framebuffer_release;
+ }
+
+ fb = &fbdev_cma->fb->fb;
+ helper->fb = fb;
+ helper->fbdev = fbi;
+
+ fbi->par = helper;
+ fbi->flags = FBINFO_FLAG_DEFAULT;
+ fbi->fbops = &drm_fbdev_cma_ops;
+
+ ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
+ if (ret) {
+ dev_err(dev->dev, "Failed to allocate color map.\n");
+ goto err_drm_fb_cma_destroy;
+ }
+
+ 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_drm_fb_cma_destroy:
+ drm_framebuffer_unregister_private(fb);
+ drm_fb_cma_destroy(fb);
+err_framebuffer_release:
+ framebuffer_release(fbi);
+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)
+{
+ if (fbdev_cma->fb_helper.fbdev) {
+ struct fb_info *info;
+ int ret;
+
+ info = fbdev_cma->fb_helper.fbdev;
+ ret = unregister_framebuffer(info);
+ if (ret < 0)
+ DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
+
+ if (info->cmap.len)
+ fb_dealloc_cmap(&info->cmap);
+
+ framebuffer_release(info);
+ }
+
+ 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);
Code Review / kvmfornfv.git / blobdiff