| /* |
| * Copyright (c) 2006-2009 Red Hat Inc. |
| * Copyright (c) 2006-2008 Intel Corporation |
| * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> |
| * |
| * DRM framebuffer helper functions |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and its |
| * documentation for any purpose is hereby granted without fee, provided that |
| * the above copyright notice appear in all copies and that both that copyright |
| * notice and this permission notice appear in supporting documentation, and |
| * that the name of the copyright holders not be used in advertising or |
| * publicity pertaining to distribution of the software without specific, |
| * written prior permission. The copyright holders make no representations |
| * about the suitability of this software for any purpose. It is provided "as |
| * is" without express or implied warranty. |
| * |
| * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| * OF THIS SOFTWARE. |
| * |
| * Authors: |
| * Dave Airlie <airlied@linux.ie> |
| * Jesse Barnes <jesse.barnes@intel.com> |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/console.h> |
| #include <linux/dma-buf.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/sysrq.h> |
| #include <linux/vmalloc.h> |
| |
| #include <drm/drm_atomic.h> |
| #include <drm/drm_crtc.h> |
| #include <drm/drm_crtc_helper.h> |
| #include <drm/drm_drv.h> |
| #include <drm/drm_fb_helper.h> |
| #include <drm/drm_fourcc.h> |
| #include <drm/drm_framebuffer.h> |
| #include <drm/drm_print.h> |
| #include <drm/drm_vblank.h> |
| |
| #include "drm_crtc_helper_internal.h" |
| #include "drm_internal.h" |
| |
| static bool drm_fbdev_emulation = true; |
| module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600); |
| MODULE_PARM_DESC(fbdev_emulation, |
| "Enable legacy fbdev emulation [default=true]"); |
| |
| static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC; |
| module_param(drm_fbdev_overalloc, int, 0444); |
| MODULE_PARM_DESC(drm_fbdev_overalloc, |
| "Overallocation of the fbdev buffer (%) [default=" |
| __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]"); |
| |
| /* |
| * In order to keep user-space compatibility, we want in certain use-cases |
| * to keep leaking the fbdev physical address to the user-space program |
| * handling the fbdev buffer. |
| * This is a bad habit essentially kept into closed source opengl driver |
| * that should really be moved into open-source upstream projects instead |
| * of using legacy physical addresses in user space to communicate with |
| * other out-of-tree kernel modules. |
| * |
| * This module_param *should* be removed as soon as possible and be |
| * considered as a broken and legacy behaviour from a modern fbdev device. |
| */ |
| #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM) |
| static bool drm_leak_fbdev_smem = false; |
| module_param_unsafe(drm_leak_fbdev_smem, bool, 0600); |
| MODULE_PARM_DESC(drm_leak_fbdev_smem, |
| "Allow unsafe leaking fbdev physical smem address [default=false]"); |
| #endif |
| |
| static LIST_HEAD(kernel_fb_helper_list); |
| static DEFINE_MUTEX(kernel_fb_helper_lock); |
| |
| /** |
| * DOC: fbdev helpers |
| * |
| * The fb helper functions are useful to provide an fbdev on top of a drm kernel |
| * mode setting driver. They can be used mostly independently from the crtc |
| * helper functions used by many drivers to implement the kernel mode setting |
| * interfaces. |
| * |
| * Drivers that support a dumb buffer with a virtual address and mmap support, |
| * should try out the generic fbdev emulation using drm_fbdev_generic_setup(). |
| * It will automatically set up deferred I/O if the driver requires a shadow |
| * buffer. |
| * |
| * At runtime drivers should restore the fbdev console by using |
| * drm_fb_helper_lastclose() as their &drm_driver.lastclose callback. |
| * They should also notify the fb helper code from updates to the output |
| * configuration by using drm_fb_helper_output_poll_changed() as their |
| * &drm_mode_config_funcs.output_poll_changed callback. |
| * |
| * For suspend/resume consider using drm_mode_config_helper_suspend() and |
| * drm_mode_config_helper_resume() which takes care of fbdev as well. |
| * |
| * All other functions exported by the fb helper library can be used to |
| * implement the fbdev driver interface by the driver. |
| * |
| * It is possible, though perhaps somewhat tricky, to implement race-free |
| * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare() |
| * helper must be called first to initialize the minimum required to make |
| * hotplug detection work. Drivers also need to make sure to properly set up |
| * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init() |
| * it is safe to enable interrupts and start processing hotplug events. At the |
| * same time, drivers should initialize all modeset objects such as CRTCs, |
| * encoders and connectors. To finish up the fbdev helper initialization, the |
| * drm_fb_helper_init() function is called. To probe for all attached displays |
| * and set up an initial configuration using the detected hardware, drivers |
| * should call drm_fb_helper_initial_config(). |
| * |
| * If &drm_framebuffer_funcs.dirty is set, the |
| * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will |
| * accumulate changes and schedule &drm_fb_helper.dirty_work to run right |
| * away. This worker then calls the dirty() function ensuring that it will |
| * always run in process context since the fb_*() function could be running in |
| * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io |
| * callback it will also schedule dirty_work with the damage collected from the |
| * mmap page writes. |
| * |
| * Deferred I/O is not compatible with SHMEM. Such drivers should request an |
| * fbdev shadow buffer and call drm_fbdev_generic_setup() instead. |
| */ |
| |
| static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc) |
| { |
| uint16_t *r_base, *g_base, *b_base; |
| |
| if (crtc->funcs->gamma_set == NULL) |
| return; |
| |
| r_base = crtc->gamma_store; |
| g_base = r_base + crtc->gamma_size; |
| b_base = g_base + crtc->gamma_size; |
| |
| crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, |
| crtc->gamma_size, NULL); |
| } |
| |
| /** |
| * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_debug_enter(struct fb_info *info) |
| { |
| struct drm_fb_helper *helper = info->par; |
| const struct drm_crtc_helper_funcs *funcs; |
| struct drm_mode_set *mode_set; |
| |
| list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { |
| mutex_lock(&helper->client.modeset_mutex); |
| drm_client_for_each_modeset(mode_set, &helper->client) { |
| if (!mode_set->crtc->enabled) |
| continue; |
| |
| funcs = mode_set->crtc->helper_private; |
| if (funcs->mode_set_base_atomic == NULL) |
| continue; |
| |
| if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev)) |
| continue; |
| |
| funcs->mode_set_base_atomic(mode_set->crtc, |
| mode_set->fb, |
| mode_set->x, |
| mode_set->y, |
| ENTER_ATOMIC_MODE_SET); |
| } |
| mutex_unlock(&helper->client.modeset_mutex); |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_debug_enter); |
| |
| /** |
| * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_debug_leave(struct fb_info *info) |
| { |
| struct drm_fb_helper *helper = info->par; |
| struct drm_client_dev *client = &helper->client; |
| struct drm_device *dev = helper->dev; |
| struct drm_crtc *crtc; |
| const struct drm_crtc_helper_funcs *funcs; |
| struct drm_mode_set *mode_set; |
| struct drm_framebuffer *fb; |
| |
| mutex_lock(&client->modeset_mutex); |
| drm_client_for_each_modeset(mode_set, client) { |
| crtc = mode_set->crtc; |
| if (drm_drv_uses_atomic_modeset(crtc->dev)) |
| continue; |
| |
| funcs = crtc->helper_private; |
| fb = crtc->primary->fb; |
| |
| if (!crtc->enabled) |
| continue; |
| |
| if (!fb) { |
| drm_err(dev, "no fb to restore?\n"); |
| continue; |
| } |
| |
| if (funcs->mode_set_base_atomic == NULL) |
| continue; |
| |
| drm_fb_helper_restore_lut_atomic(mode_set->crtc); |
| funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, |
| crtc->y, LEAVE_ATOMIC_MODE_SET); |
| } |
| mutex_unlock(&client->modeset_mutex); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_debug_leave); |
| |
| static int |
| __drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper, |
| bool force) |
| { |
| bool do_delayed; |
| int ret; |
| |
| if (!drm_fbdev_emulation || !fb_helper) |
| return -ENODEV; |
| |
| if (READ_ONCE(fb_helper->deferred_setup)) |
| return 0; |
| |
| mutex_lock(&fb_helper->lock); |
| if (force) { |
| /* |
| * Yes this is the _locked version which expects the master lock |
| * to be held. But for forced restores we're intentionally |
| * racing here, see drm_fb_helper_set_par(). |
| */ |
| ret = drm_client_modeset_commit_locked(&fb_helper->client); |
| } else { |
| ret = drm_client_modeset_commit(&fb_helper->client); |
| } |
| |
| do_delayed = fb_helper->delayed_hotplug; |
| if (do_delayed) |
| fb_helper->delayed_hotplug = false; |
| mutex_unlock(&fb_helper->lock); |
| |
| if (do_delayed) |
| drm_fb_helper_hotplug_event(fb_helper); |
| |
| return ret; |
| } |
| |
| /** |
| * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration |
| * @fb_helper: driver-allocated fbdev helper, can be NULL |
| * |
| * This should be called from driver's drm &drm_driver.lastclose callback |
| * when implementing an fbcon on top of kms using this helper. This ensures that |
| * the user isn't greeted with a black screen when e.g. X dies. |
| * |
| * RETURNS: |
| * Zero if everything went ok, negative error code otherwise. |
| */ |
| int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) |
| { |
| return __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, false); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked); |
| |
| #ifdef CONFIG_MAGIC_SYSRQ |
| /* emergency restore, don't bother with error reporting */ |
| static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) |
| { |
| struct drm_fb_helper *helper; |
| |
| mutex_lock(&kernel_fb_helper_lock); |
| list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { |
| struct drm_device *dev = helper->dev; |
| |
| if (dev->switch_power_state == DRM_SWITCH_POWER_OFF) |
| continue; |
| |
| mutex_lock(&helper->lock); |
| drm_client_modeset_commit_locked(&helper->client); |
| mutex_unlock(&helper->lock); |
| } |
| mutex_unlock(&kernel_fb_helper_lock); |
| } |
| |
| static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn); |
| |
| static void drm_fb_helper_sysrq(int dummy1) |
| { |
| schedule_work(&drm_fb_helper_restore_work); |
| } |
| |
| static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { |
| .handler = drm_fb_helper_sysrq, |
| .help_msg = "force-fb(v)", |
| .action_msg = "Restore framebuffer console", |
| }; |
| #else |
| static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; |
| #endif |
| |
| static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| |
| mutex_lock(&fb_helper->lock); |
| drm_client_modeset_dpms(&fb_helper->client, dpms_mode); |
| mutex_unlock(&fb_helper->lock); |
| } |
| |
| /** |
| * drm_fb_helper_blank - implementation for &fb_ops.fb_blank |
| * @blank: desired blanking state |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_blank(int blank, struct fb_info *info) |
| { |
| if (oops_in_progress) |
| return -EBUSY; |
| |
| switch (blank) { |
| /* Display: On; HSync: On, VSync: On */ |
| case FB_BLANK_UNBLANK: |
| drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON); |
| break; |
| /* Display: Off; HSync: On, VSync: On */ |
| case FB_BLANK_NORMAL: |
| drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); |
| break; |
| /* Display: Off; HSync: Off, VSync: On */ |
| case FB_BLANK_HSYNC_SUSPEND: |
| drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); |
| break; |
| /* Display: Off; HSync: On, VSync: Off */ |
| case FB_BLANK_VSYNC_SUSPEND: |
| drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND); |
| break; |
| /* Display: Off; HSync: Off, VSync: Off */ |
| case FB_BLANK_POWERDOWN: |
| drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF); |
| break; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_blank); |
| |
| static void drm_fb_helper_resume_worker(struct work_struct *work) |
| { |
| struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, |
| resume_work); |
| |
| console_lock(); |
| fb_set_suspend(helper->fbdev, 0); |
| console_unlock(); |
| } |
| |
| static void drm_fb_helper_damage_blit_real(struct drm_fb_helper *fb_helper, |
| struct drm_clip_rect *clip, |
| struct iosys_map *dst) |
| { |
| struct drm_framebuffer *fb = fb_helper->fb; |
| unsigned int cpp = fb->format->cpp[0]; |
| size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp; |
| void *src = fb_helper->fbdev->screen_buffer + offset; |
| size_t len = (clip->x2 - clip->x1) * cpp; |
| unsigned int y; |
| |
| iosys_map_incr(dst, offset); /* go to first pixel within clip rect */ |
| |
| for (y = clip->y1; y < clip->y2; y++) { |
| iosys_map_memcpy_to(dst, 0, src, len); |
| iosys_map_incr(dst, fb->pitches[0]); |
| src += fb->pitches[0]; |
| } |
| } |
| |
| static int drm_fb_helper_damage_blit(struct drm_fb_helper *fb_helper, |
| struct drm_clip_rect *clip) |
| { |
| struct drm_client_buffer *buffer = fb_helper->buffer; |
| struct iosys_map map, dst; |
| int ret; |
| |
| /* |
| * We have to pin the client buffer to its current location while |
| * flushing the shadow buffer. In the general case, concurrent |
| * modesetting operations could try to move the buffer and would |
| * fail. The modeset has to be serialized by acquiring the reservation |
| * object of the underlying BO here. |
| * |
| * For fbdev emulation, we only have to protect against fbdev modeset |
| * operations. Nothing else will involve the client buffer's BO. So it |
| * is sufficient to acquire struct drm_fb_helper.lock here. |
| */ |
| mutex_lock(&fb_helper->lock); |
| |
| ret = drm_client_buffer_vmap(buffer, &map); |
| if (ret) |
| goto out; |
| |
| dst = map; |
| drm_fb_helper_damage_blit_real(fb_helper, clip, &dst); |
| |
| drm_client_buffer_vunmap(buffer); |
| |
| out: |
| mutex_unlock(&fb_helper->lock); |
| |
| return ret; |
| } |
| |
| static void drm_fb_helper_damage_work(struct work_struct *work) |
| { |
| struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, |
| damage_work); |
| struct drm_device *dev = helper->dev; |
| struct drm_clip_rect *clip = &helper->damage_clip; |
| struct drm_clip_rect clip_copy; |
| unsigned long flags; |
| int ret; |
| |
| spin_lock_irqsave(&helper->damage_lock, flags); |
| clip_copy = *clip; |
| clip->x1 = clip->y1 = ~0; |
| clip->x2 = clip->y2 = 0; |
| spin_unlock_irqrestore(&helper->damage_lock, flags); |
| |
| /* Call damage handlers only if necessary */ |
| if (!(clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2)) |
| return; |
| |
| if (helper->buffer) { |
| ret = drm_fb_helper_damage_blit(helper, &clip_copy); |
| if (drm_WARN_ONCE(dev, ret, "Damage blitter failed: ret=%d\n", ret)) |
| goto err; |
| } |
| |
| if (helper->fb->funcs->dirty) { |
| ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); |
| if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret)) |
| goto err; |
| } |
| |
| return; |
| |
| err: |
| /* |
| * Restore damage clip rectangle on errors. The next run |
| * of the damage worker will perform the update. |
| */ |
| spin_lock_irqsave(&helper->damage_lock, flags); |
| clip->x1 = min_t(u32, clip->x1, clip_copy.x1); |
| clip->y1 = min_t(u32, clip->y1, clip_copy.y1); |
| clip->x2 = max_t(u32, clip->x2, clip_copy.x2); |
| clip->y2 = max_t(u32, clip->y2, clip_copy.y2); |
| spin_unlock_irqrestore(&helper->damage_lock, flags); |
| } |
| |
| /** |
| * drm_fb_helper_prepare - setup a drm_fb_helper structure |
| * @dev: DRM device |
| * @helper: driver-allocated fbdev helper structure to set up |
| * @funcs: pointer to structure of functions associate with this helper |
| * |
| * Sets up the bare minimum to make the framebuffer helper usable. This is |
| * useful to implement race-free initialization of the polling helpers. |
| */ |
| void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, |
| const struct drm_fb_helper_funcs *funcs) |
| { |
| INIT_LIST_HEAD(&helper->kernel_fb_list); |
| spin_lock_init(&helper->damage_lock); |
| INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker); |
| INIT_WORK(&helper->damage_work, drm_fb_helper_damage_work); |
| helper->damage_clip.x1 = helper->damage_clip.y1 = ~0; |
| mutex_init(&helper->lock); |
| helper->funcs = funcs; |
| helper->dev = dev; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_prepare); |
| |
| /** |
| * drm_fb_helper_init - initialize a &struct drm_fb_helper |
| * @dev: drm device |
| * @fb_helper: driver-allocated fbdev helper structure to initialize |
| * |
| * This allocates the structures for the fbdev helper with the given limits. |
| * Note that this won't yet touch the hardware (through the driver interfaces) |
| * nor register the fbdev. This is only done in drm_fb_helper_initial_config() |
| * to allow driver writes more control over the exact init sequence. |
| * |
| * Drivers must call drm_fb_helper_prepare() before calling this function. |
| * |
| * RETURNS: |
| * Zero if everything went ok, nonzero otherwise. |
| */ |
| int drm_fb_helper_init(struct drm_device *dev, |
| struct drm_fb_helper *fb_helper) |
| { |
| int ret; |
| |
| if (!drm_fbdev_emulation) { |
| dev->fb_helper = fb_helper; |
| return 0; |
| } |
| |
| /* |
| * If this is not the generic fbdev client, initialize a drm_client |
| * without callbacks so we can use the modesets. |
| */ |
| if (!fb_helper->client.funcs) { |
| ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL); |
| if (ret) |
| return ret; |
| } |
| |
| dev->fb_helper = fb_helper; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_init); |
| |
| /** |
| * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members |
| * @fb_helper: driver-allocated fbdev helper |
| * |
| * A helper to alloc fb_info and the members cmap and apertures. Called |
| * by the driver within the fb_probe fb_helper callback function. Drivers do not |
| * need to release the allocated fb_info structure themselves, this is |
| * automatically done when calling drm_fb_helper_fini(). |
| * |
| * RETURNS: |
| * fb_info pointer if things went okay, pointer containing error code |
| * otherwise |
| */ |
| struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper) |
| { |
| struct device *dev = fb_helper->dev->dev; |
| struct fb_info *info; |
| int ret; |
| |
| info = framebuffer_alloc(0, dev); |
| if (!info) |
| return ERR_PTR(-ENOMEM); |
| |
| ret = fb_alloc_cmap(&info->cmap, 256, 0); |
| if (ret) |
| goto err_release; |
| |
| /* |
| * TODO: We really should be smarter here and alloc an aperture |
| * for each IORESOURCE_MEM resource helper->dev->dev has and also |
| * init the ranges of the appertures based on the resources. |
| * Note some drivers currently count on there being only 1 empty |
| * aperture and fill this themselves, these will need to be dealt |
| * with somehow when fixing this. |
| */ |
| info->apertures = alloc_apertures(1); |
| if (!info->apertures) { |
| ret = -ENOMEM; |
| goto err_free_cmap; |
| } |
| |
| fb_helper->fbdev = info; |
| info->skip_vt_switch = true; |
| |
| return info; |
| |
| err_free_cmap: |
| fb_dealloc_cmap(&info->cmap); |
| err_release: |
| framebuffer_release(info); |
| return ERR_PTR(ret); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_alloc_fbi); |
| |
| /** |
| * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device |
| * @fb_helper: driver-allocated fbdev helper, can be NULL |
| * |
| * A wrapper around unregister_framebuffer, to release the fb_info |
| * framebuffer device. This must be called before releasing all resources for |
| * @fb_helper by calling drm_fb_helper_fini(). |
| */ |
| void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper) |
| { |
| if (fb_helper && fb_helper->fbdev) |
| unregister_framebuffer(fb_helper->fbdev); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_unregister_fbi); |
| |
| /** |
| * drm_fb_helper_fini - finialize a &struct drm_fb_helper |
| * @fb_helper: driver-allocated fbdev helper, can be NULL |
| * |
| * This cleans up all remaining resources associated with @fb_helper. |
| */ |
| void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) |
| { |
| struct fb_info *info; |
| |
| if (!fb_helper) |
| return; |
| |
| fb_helper->dev->fb_helper = NULL; |
| |
| if (!drm_fbdev_emulation) |
| return; |
| |
| cancel_work_sync(&fb_helper->resume_work); |
| cancel_work_sync(&fb_helper->damage_work); |
| |
| info = fb_helper->fbdev; |
| if (info) { |
| if (info->cmap.len) |
| fb_dealloc_cmap(&info->cmap); |
| framebuffer_release(info); |
| } |
| fb_helper->fbdev = NULL; |
| |
| mutex_lock(&kernel_fb_helper_lock); |
| if (!list_empty(&fb_helper->kernel_fb_list)) { |
| list_del(&fb_helper->kernel_fb_list); |
| if (list_empty(&kernel_fb_helper_list)) |
| unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); |
| } |
| mutex_unlock(&kernel_fb_helper_lock); |
| |
| mutex_destroy(&fb_helper->lock); |
| |
| if (!fb_helper->client.funcs) |
| drm_client_release(&fb_helper->client); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_fini); |
| |
| static bool drm_fbdev_use_shadow_fb(struct drm_fb_helper *fb_helper) |
| { |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_framebuffer *fb = fb_helper->fb; |
| |
| return dev->mode_config.prefer_shadow_fbdev || |
| dev->mode_config.prefer_shadow || |
| fb->funcs->dirty; |
| } |
| |
| static void drm_fb_helper_damage(struct fb_info *info, u32 x, u32 y, |
| u32 width, u32 height) |
| { |
| struct drm_fb_helper *helper = info->par; |
| struct drm_clip_rect *clip = &helper->damage_clip; |
| unsigned long flags; |
| |
| if (!drm_fbdev_use_shadow_fb(helper)) |
| return; |
| |
| spin_lock_irqsave(&helper->damage_lock, flags); |
| clip->x1 = min_t(u32, clip->x1, x); |
| clip->y1 = min_t(u32, clip->y1, y); |
| clip->x2 = max_t(u32, clip->x2, x + width); |
| clip->y2 = max_t(u32, clip->y2, y + height); |
| spin_unlock_irqrestore(&helper->damage_lock, flags); |
| |
| schedule_work(&helper->damage_work); |
| } |
| |
| /* |
| * Convert memory region into area of scanlines and pixels per |
| * scanline. The parameters off and len must not reach beyond |
| * the end of the framebuffer. |
| */ |
| static void drm_fb_helper_memory_range_to_clip(struct fb_info *info, off_t off, size_t len, |
| struct drm_rect *clip) |
| { |
| off_t end = off + len; |
| u32 x1 = 0; |
| u32 y1 = off / info->fix.line_length; |
| u32 x2 = info->var.xres; |
| u32 y2 = DIV_ROUND_UP(end, info->fix.line_length); |
| |
| if ((y2 - y1) == 1) { |
| /* |
| * We've only written to a single scanline. Try to reduce |
| * the number of horizontal pixels that need an update. |
| */ |
| off_t bit_off = (off % info->fix.line_length) * 8; |
| off_t bit_end = (end % info->fix.line_length) * 8; |
| |
| x1 = bit_off / info->var.bits_per_pixel; |
| x2 = DIV_ROUND_UP(bit_end, info->var.bits_per_pixel); |
| } |
| |
| drm_rect_init(clip, x1, y1, x2 - x1, y2 - y1); |
| } |
| |
| /** |
| * drm_fb_helper_deferred_io() - fbdev deferred_io callback function |
| * @info: fb_info struct pointer |
| * @pagereflist: list of mmap framebuffer pages that have to be flushed |
| * |
| * This function is used as the &fb_deferred_io.deferred_io |
| * callback function for flushing the fbdev mmap writes. |
| */ |
| void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagereflist) |
| { |
| unsigned long start, end, min_off, max_off; |
| struct fb_deferred_io_pageref *pageref; |
| struct drm_rect damage_area; |
| |
| min_off = ULONG_MAX; |
| max_off = 0; |
| list_for_each_entry(pageref, pagereflist, list) { |
| start = pageref->offset; |
| end = start + PAGE_SIZE; |
| min_off = min(min_off, start); |
| max_off = max(max_off, end); |
| } |
| if (min_off >= max_off) |
| return; |
| |
| /* |
| * As we can only track pages, we might reach beyond the end |
| * of the screen and account for non-existing scanlines. Hence, |
| * keep the covered memory area within the screen buffer. |
| */ |
| max_off = min(max_off, info->screen_size); |
| |
| drm_fb_helper_memory_range_to_clip(info, min_off, max_off - min_off, &damage_area); |
| drm_fb_helper_damage(info, damage_area.x1, damage_area.y1, |
| drm_rect_width(&damage_area), |
| drm_rect_height(&damage_area)); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_deferred_io); |
| |
| /** |
| * drm_fb_helper_sys_read - wrapper around fb_sys_read |
| * @info: fb_info struct pointer |
| * @buf: userspace buffer to read from framebuffer memory |
| * @count: number of bytes to read from framebuffer memory |
| * @ppos: read offset within framebuffer memory |
| * |
| * A wrapper around fb_sys_read implemented by fbdev core |
| */ |
| ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| return fb_sys_read(info, buf, count, ppos); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_sys_read); |
| |
| /** |
| * drm_fb_helper_sys_write - wrapper around fb_sys_write |
| * @info: fb_info struct pointer |
| * @buf: userspace buffer to write to framebuffer memory |
| * @count: number of bytes to write to framebuffer memory |
| * @ppos: write offset within framebuffer memory |
| * |
| * A wrapper around fb_sys_write implemented by fbdev core |
| */ |
| ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| loff_t pos = *ppos; |
| ssize_t ret; |
| struct drm_rect damage_area; |
| |
| ret = fb_sys_write(info, buf, count, ppos); |
| if (ret <= 0) |
| return ret; |
| |
| drm_fb_helper_memory_range_to_clip(info, pos, ret, &damage_area); |
| drm_fb_helper_damage(info, damage_area.x1, damage_area.y1, |
| drm_rect_width(&damage_area), |
| drm_rect_height(&damage_area)); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_sys_write); |
| |
| /** |
| * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect |
| * @info: fbdev registered by the helper |
| * @rect: info about rectangle to fill |
| * |
| * A wrapper around sys_fillrect implemented by fbdev core |
| */ |
| void drm_fb_helper_sys_fillrect(struct fb_info *info, |
| const struct fb_fillrect *rect) |
| { |
| sys_fillrect(info, rect); |
| drm_fb_helper_damage(info, rect->dx, rect->dy, rect->width, rect->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_sys_fillrect); |
| |
| /** |
| * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea |
| * @info: fbdev registered by the helper |
| * @area: info about area to copy |
| * |
| * A wrapper around sys_copyarea implemented by fbdev core |
| */ |
| void drm_fb_helper_sys_copyarea(struct fb_info *info, |
| const struct fb_copyarea *area) |
| { |
| sys_copyarea(info, area); |
| drm_fb_helper_damage(info, area->dx, area->dy, area->width, area->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_sys_copyarea); |
| |
| /** |
| * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit |
| * @info: fbdev registered by the helper |
| * @image: info about image to blit |
| * |
| * A wrapper around sys_imageblit implemented by fbdev core |
| */ |
| void drm_fb_helper_sys_imageblit(struct fb_info *info, |
| const struct fb_image *image) |
| { |
| sys_imageblit(info, image); |
| drm_fb_helper_damage(info, image->dx, image->dy, image->width, image->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_sys_imageblit); |
| |
| /** |
| * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect |
| * @info: fbdev registered by the helper |
| * @rect: info about rectangle to fill |
| * |
| * A wrapper around cfb_fillrect implemented by fbdev core |
| */ |
| void drm_fb_helper_cfb_fillrect(struct fb_info *info, |
| const struct fb_fillrect *rect) |
| { |
| cfb_fillrect(info, rect); |
| drm_fb_helper_damage(info, rect->dx, rect->dy, rect->width, rect->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect); |
| |
| /** |
| * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea |
| * @info: fbdev registered by the helper |
| * @area: info about area to copy |
| * |
| * A wrapper around cfb_copyarea implemented by fbdev core |
| */ |
| void drm_fb_helper_cfb_copyarea(struct fb_info *info, |
| const struct fb_copyarea *area) |
| { |
| cfb_copyarea(info, area); |
| drm_fb_helper_damage(info, area->dx, area->dy, area->width, area->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea); |
| |
| /** |
| * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit |
| * @info: fbdev registered by the helper |
| * @image: info about image to blit |
| * |
| * A wrapper around cfb_imageblit implemented by fbdev core |
| */ |
| void drm_fb_helper_cfb_imageblit(struct fb_info *info, |
| const struct fb_image *image) |
| { |
| cfb_imageblit(info, image); |
| drm_fb_helper_damage(info, image->dx, image->dy, image->width, image->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit); |
| |
| /** |
| * drm_fb_helper_set_suspend - wrapper around fb_set_suspend |
| * @fb_helper: driver-allocated fbdev helper, can be NULL |
| * @suspend: whether to suspend or resume |
| * |
| * A wrapper around fb_set_suspend implemented by fbdev core. |
| * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take |
| * the lock yourself |
| */ |
| void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend) |
| { |
| if (fb_helper && fb_helper->fbdev) |
| fb_set_suspend(fb_helper->fbdev, suspend); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_set_suspend); |
| |
| /** |
| * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also |
| * takes the console lock |
| * @fb_helper: driver-allocated fbdev helper, can be NULL |
| * @suspend: whether to suspend or resume |
| * |
| * A wrapper around fb_set_suspend() that takes the console lock. If the lock |
| * isn't available on resume, a worker is tasked with waiting for the lock |
| * to become available. The console lock can be pretty contented on resume |
| * due to all the printk activity. |
| * |
| * This function can be called multiple times with the same state since |
| * &fb_info.state is checked to see if fbdev is running or not before locking. |
| * |
| * Use drm_fb_helper_set_suspend() if you need to take the lock yourself. |
| */ |
| void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, |
| bool suspend) |
| { |
| if (!fb_helper || !fb_helper->fbdev) |
| return; |
| |
| /* make sure there's no pending/ongoing resume */ |
| flush_work(&fb_helper->resume_work); |
| |
| if (suspend) { |
| if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING) |
| return; |
| |
| console_lock(); |
| |
| } else { |
| if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING) |
| return; |
| |
| if (!console_trylock()) { |
| schedule_work(&fb_helper->resume_work); |
| return; |
| } |
| } |
| |
| fb_set_suspend(fb_helper->fbdev, suspend); |
| console_unlock(); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked); |
| |
| static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info) |
| { |
| u32 *palette = (u32 *)info->pseudo_palette; |
| int i; |
| |
| if (cmap->start + cmap->len > 16) |
| return -EINVAL; |
| |
| for (i = 0; i < cmap->len; ++i) { |
| u16 red = cmap->red[i]; |
| u16 green = cmap->green[i]; |
| u16 blue = cmap->blue[i]; |
| u32 value; |
| |
| red >>= 16 - info->var.red.length; |
| green >>= 16 - info->var.green.length; |
| blue >>= 16 - info->var.blue.length; |
| value = (red << info->var.red.offset) | |
| (green << info->var.green.offset) | |
| (blue << info->var.blue.offset); |
| if (info->var.transp.length > 0) { |
| u32 mask = (1 << info->var.transp.length) - 1; |
| |
| mask <<= info->var.transp.offset; |
| value |= mask; |
| } |
| palette[cmap->start + i] = value; |
| } |
| |
| return 0; |
| } |
| |
| static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_mode_set *modeset; |
| struct drm_crtc *crtc; |
| u16 *r, *g, *b; |
| int ret = 0; |
| |
| drm_modeset_lock_all(fb_helper->dev); |
| drm_client_for_each_modeset(modeset, &fb_helper->client) { |
| crtc = modeset->crtc; |
| if (!crtc->funcs->gamma_set || !crtc->gamma_size) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (cmap->start + cmap->len > crtc->gamma_size) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| r = crtc->gamma_store; |
| g = r + crtc->gamma_size; |
| b = g + crtc->gamma_size; |
| |
| memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r)); |
| memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g)); |
| memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b)); |
| |
| ret = crtc->funcs->gamma_set(crtc, r, g, b, |
| crtc->gamma_size, NULL); |
| if (ret) |
| goto out; |
| } |
| out: |
| drm_modeset_unlock_all(fb_helper->dev); |
| |
| return ret; |
| } |
| |
| static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc, |
| struct fb_cmap *cmap) |
| { |
| struct drm_device *dev = crtc->dev; |
| struct drm_property_blob *gamma_lut; |
| struct drm_color_lut *lut; |
| int size = crtc->gamma_size; |
| int i; |
| |
| if (!size || cmap->start + cmap->len > size) |
| return ERR_PTR(-EINVAL); |
| |
| gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL); |
| if (IS_ERR(gamma_lut)) |
| return gamma_lut; |
| |
| lut = gamma_lut->data; |
| if (cmap->start || cmap->len != size) { |
| u16 *r = crtc->gamma_store; |
| u16 *g = r + crtc->gamma_size; |
| u16 *b = g + crtc->gamma_size; |
| |
| for (i = 0; i < cmap->start; i++) { |
| lut[i].red = r[i]; |
| lut[i].green = g[i]; |
| lut[i].blue = b[i]; |
| } |
| for (i = cmap->start + cmap->len; i < size; i++) { |
| lut[i].red = r[i]; |
| lut[i].green = g[i]; |
| lut[i].blue = b[i]; |
| } |
| } |
| |
| for (i = 0; i < cmap->len; i++) { |
| lut[cmap->start + i].red = cmap->red[i]; |
| lut[cmap->start + i].green = cmap->green[i]; |
| lut[cmap->start + i].blue = cmap->blue[i]; |
| } |
| |
| return gamma_lut; |
| } |
| |
| static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_property_blob *gamma_lut = NULL; |
| struct drm_modeset_acquire_ctx ctx; |
| struct drm_crtc_state *crtc_state; |
| struct drm_atomic_state *state; |
| struct drm_mode_set *modeset; |
| struct drm_crtc *crtc; |
| u16 *r, *g, *b; |
| bool replaced; |
| int ret = 0; |
| |
| drm_modeset_acquire_init(&ctx, 0); |
| |
| state = drm_atomic_state_alloc(dev); |
| if (!state) { |
| ret = -ENOMEM; |
| goto out_ctx; |
| } |
| |
| state->acquire_ctx = &ctx; |
| retry: |
| drm_client_for_each_modeset(modeset, &fb_helper->client) { |
| crtc = modeset->crtc; |
| |
| if (!gamma_lut) |
| gamma_lut = setcmap_new_gamma_lut(crtc, cmap); |
| if (IS_ERR(gamma_lut)) { |
| ret = PTR_ERR(gamma_lut); |
| gamma_lut = NULL; |
| goto out_state; |
| } |
| |
| crtc_state = drm_atomic_get_crtc_state(state, crtc); |
| if (IS_ERR(crtc_state)) { |
| ret = PTR_ERR(crtc_state); |
| goto out_state; |
| } |
| |
| /* |
| * FIXME: This always uses gamma_lut. Some HW have only |
| * degamma_lut, in which case we should reset gamma_lut and set |
| * degamma_lut. See drm_crtc_legacy_gamma_set(). |
| */ |
| replaced = drm_property_replace_blob(&crtc_state->degamma_lut, |
| NULL); |
| replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL); |
| replaced |= drm_property_replace_blob(&crtc_state->gamma_lut, |
| gamma_lut); |
| crtc_state->color_mgmt_changed |= replaced; |
| } |
| |
| ret = drm_atomic_commit(state); |
| if (ret) |
| goto out_state; |
| |
| drm_client_for_each_modeset(modeset, &fb_helper->client) { |
| crtc = modeset->crtc; |
| |
| r = crtc->gamma_store; |
| g = r + crtc->gamma_size; |
| b = g + crtc->gamma_size; |
| |
| memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r)); |
| memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g)); |
| memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b)); |
| } |
| |
| out_state: |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| drm_property_blob_put(gamma_lut); |
| drm_atomic_state_put(state); |
| out_ctx: |
| drm_modeset_drop_locks(&ctx); |
| drm_modeset_acquire_fini(&ctx); |
| |
| return ret; |
| |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_modeset_backoff(&ctx); |
| goto retry; |
| } |
| |
| /** |
| * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap |
| * @cmap: cmap to set |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_device *dev = fb_helper->dev; |
| int ret; |
| |
| if (oops_in_progress) |
| return -EBUSY; |
| |
| mutex_lock(&fb_helper->lock); |
| |
| if (!drm_master_internal_acquire(dev)) { |
| ret = -EBUSY; |
| goto unlock; |
| } |
| |
| mutex_lock(&fb_helper->client.modeset_mutex); |
| if (info->fix.visual == FB_VISUAL_TRUECOLOR) |
| ret = setcmap_pseudo_palette(cmap, info); |
| else if (drm_drv_uses_atomic_modeset(fb_helper->dev)) |
| ret = setcmap_atomic(cmap, info); |
| else |
| ret = setcmap_legacy(cmap, info); |
| mutex_unlock(&fb_helper->client.modeset_mutex); |
| |
| drm_master_internal_release(dev); |
| unlock: |
| mutex_unlock(&fb_helper->lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_setcmap); |
| |
| /** |
| * drm_fb_helper_ioctl - legacy ioctl implementation |
| * @info: fbdev registered by the helper |
| * @cmd: ioctl command |
| * @arg: ioctl argument |
| * |
| * A helper to implement the standard fbdev ioctl. Only |
| * FBIO_WAITFORVSYNC is implemented for now. |
| */ |
| int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd, |
| unsigned long arg) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_crtc *crtc; |
| int ret = 0; |
| |
| mutex_lock(&fb_helper->lock); |
| if (!drm_master_internal_acquire(dev)) { |
| ret = -EBUSY; |
| goto unlock; |
| } |
| |
| switch (cmd) { |
| case FBIO_WAITFORVSYNC: |
| /* |
| * Only consider the first CRTC. |
| * |
| * This ioctl is supposed to take the CRTC number as |
| * an argument, but in fbdev times, what that number |
| * was supposed to be was quite unclear, different |
| * drivers were passing that argument differently |
| * (some by reference, some by value), and most of the |
| * userspace applications were just hardcoding 0 as an |
| * argument. |
| * |
| * The first CRTC should be the integrated panel on |
| * most drivers, so this is the best choice we can |
| * make. If we're not smart enough here, one should |
| * just consider switch the userspace to KMS. |
| */ |
| crtc = fb_helper->client.modesets[0].crtc; |
| |
| /* |
| * Only wait for a vblank event if the CRTC is |
| * enabled, otherwise just don't do anythintg, |
| * not even report an error. |
| */ |
| ret = drm_crtc_vblank_get(crtc); |
| if (!ret) { |
| drm_crtc_wait_one_vblank(crtc); |
| drm_crtc_vblank_put(crtc); |
| } |
| |
| ret = 0; |
| break; |
| default: |
| ret = -ENOTTY; |
| } |
| |
| drm_master_internal_release(dev); |
| unlock: |
| mutex_unlock(&fb_helper->lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_ioctl); |
| |
| static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1, |
| const struct fb_var_screeninfo *var_2) |
| { |
| return var_1->bits_per_pixel == var_2->bits_per_pixel && |
| var_1->grayscale == var_2->grayscale && |
| var_1->red.offset == var_2->red.offset && |
| var_1->red.length == var_2->red.length && |
| var_1->red.msb_right == var_2->red.msb_right && |
| var_1->green.offset == var_2->green.offset && |
| var_1->green.length == var_2->green.length && |
| var_1->green.msb_right == var_2->green.msb_right && |
| var_1->blue.offset == var_2->blue.offset && |
| var_1->blue.length == var_2->blue.length && |
| var_1->blue.msb_right == var_2->blue.msb_right && |
| var_1->transp.offset == var_2->transp.offset && |
| var_1->transp.length == var_2->transp.length && |
| var_1->transp.msb_right == var_2->transp.msb_right; |
| } |
| |
| static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var, |
| u8 depth) |
| { |
| switch (depth) { |
| case 8: |
| var->red.offset = 0; |
| var->green.offset = 0; |
| var->blue.offset = 0; |
| var->red.length = 8; /* 8bit DAC */ |
| var->green.length = 8; |
| var->blue.length = 8; |
| var->transp.offset = 0; |
| var->transp.length = 0; |
| break; |
| case 15: |
| var->red.offset = 10; |
| var->green.offset = 5; |
| var->blue.offset = 0; |
| var->red.length = 5; |
| var->green.length = 5; |
| var->blue.length = 5; |
| var->transp.offset = 15; |
| var->transp.length = 1; |
| break; |
| case 16: |
| var->red.offset = 11; |
| var->green.offset = 5; |
| var->blue.offset = 0; |
| var->red.length = 5; |
| var->green.length = 6; |
| var->blue.length = 5; |
| var->transp.offset = 0; |
| break; |
| case 24: |
| var->red.offset = 16; |
| var->green.offset = 8; |
| var->blue.offset = 0; |
| var->red.length = 8; |
| var->green.length = 8; |
| var->blue.length = 8; |
| var->transp.offset = 0; |
| var->transp.length = 0; |
| break; |
| case 32: |
| var->red.offset = 16; |
| var->green.offset = 8; |
| var->blue.offset = 0; |
| var->red.length = 8; |
| var->green.length = 8; |
| var->blue.length = 8; |
| var->transp.offset = 24; |
| var->transp.length = 8; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| /** |
| * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var |
| * @var: screeninfo to check |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_check_var(struct fb_var_screeninfo *var, |
| struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_framebuffer *fb = fb_helper->fb; |
| struct drm_device *dev = fb_helper->dev; |
| |
| if (in_dbg_master()) |
| return -EINVAL; |
| |
| if (var->pixclock != 0) { |
| drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n"); |
| var->pixclock = 0; |
| } |
| |
| if ((drm_format_info_block_width(fb->format, 0) > 1) || |
| (drm_format_info_block_height(fb->format, 0) > 1)) |
| return -EINVAL; |
| |
| /* |
| * Changes struct fb_var_screeninfo are currently not pushed back |
| * to KMS, hence fail if different settings are requested. |
| */ |
| if (var->bits_per_pixel > fb->format->cpp[0] * 8 || |
| var->xres > fb->width || var->yres > fb->height || |
| var->xres_virtual > fb->width || var->yres_virtual > fb->height) { |
| drm_dbg_kms(dev, "fb requested width/height/bpp can't fit in current fb " |
| "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", |
| var->xres, var->yres, var->bits_per_pixel, |
| var->xres_virtual, var->yres_virtual, |
| fb->width, fb->height, fb->format->cpp[0] * 8); |
| return -EINVAL; |
| } |
| |
| /* |
| * Workaround for SDL 1.2, which is known to be setting all pixel format |
| * fields values to zero in some cases. We treat this situation as a |
| * kind of "use some reasonable autodetected values". |
| */ |
| if (!var->red.offset && !var->green.offset && |
| !var->blue.offset && !var->transp.offset && |
| !var->red.length && !var->green.length && |
| !var->blue.length && !var->transp.length && |
| !var->red.msb_right && !var->green.msb_right && |
| !var->blue.msb_right && !var->transp.msb_right) { |
| drm_fb_helper_fill_pixel_fmt(var, fb->format->depth); |
| } |
| |
| /* |
| * Likewise, bits_per_pixel should be rounded up to a supported value. |
| */ |
| var->bits_per_pixel = fb->format->cpp[0] * 8; |
| |
| /* |
| * drm fbdev emulation doesn't support changing the pixel format at all, |
| * so reject all pixel format changing requests. |
| */ |
| if (!drm_fb_pixel_format_equal(var, &info->var)) { |
| drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel format\n"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_check_var); |
| |
| /** |
| * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par |
| * @info: fbdev registered by the helper |
| * |
| * This will let fbcon do the mode init and is called at initialization time by |
| * the fbdev core when registering the driver, and later on through the hotplug |
| * callback. |
| */ |
| int drm_fb_helper_set_par(struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct fb_var_screeninfo *var = &info->var; |
| bool force; |
| |
| if (oops_in_progress) |
| return -EBUSY; |
| |
| if (var->pixclock != 0) { |
| drm_err(fb_helper->dev, "PIXEL CLOCK SET\n"); |
| return -EINVAL; |
| } |
| |
| /* |
| * Normally we want to make sure that a kms master takes precedence over |
| * fbdev, to avoid fbdev flickering and occasionally stealing the |
| * display status. But Xorg first sets the vt back to text mode using |
| * the KDSET IOCTL with KD_TEXT, and only after that drops the master |
| * status when exiting. |
| * |
| * In the past this was caught by drm_fb_helper_lastclose(), but on |
| * modern systems where logind always keeps a drm fd open to orchestrate |
| * the vt switching, this doesn't work. |
| * |
| * To not break the userspace ABI we have this special case here, which |
| * is only used for the above case. Everything else uses the normal |
| * commit function, which ensures that we never steal the display from |
| * an active drm master. |
| */ |
| force = var->activate & FB_ACTIVATE_KD_TEXT; |
| |
| __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, force); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_set_par); |
| |
| static void pan_set(struct drm_fb_helper *fb_helper, int x, int y) |
| { |
| struct drm_mode_set *mode_set; |
| |
| mutex_lock(&fb_helper->client.modeset_mutex); |
| drm_client_for_each_modeset(mode_set, &fb_helper->client) { |
| mode_set->x = x; |
| mode_set->y = y; |
| } |
| mutex_unlock(&fb_helper->client.modeset_mutex); |
| } |
| |
| static int pan_display_atomic(struct fb_var_screeninfo *var, |
| struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| int ret; |
| |
| pan_set(fb_helper, var->xoffset, var->yoffset); |
| |
| ret = drm_client_modeset_commit_locked(&fb_helper->client); |
| if (!ret) { |
| info->var.xoffset = var->xoffset; |
| info->var.yoffset = var->yoffset; |
| } else |
| pan_set(fb_helper, info->var.xoffset, info->var.yoffset); |
| |
| return ret; |
| } |
| |
| static int pan_display_legacy(struct fb_var_screeninfo *var, |
| struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_client_dev *client = &fb_helper->client; |
| struct drm_mode_set *modeset; |
| int ret = 0; |
| |
| mutex_lock(&client->modeset_mutex); |
| drm_modeset_lock_all(fb_helper->dev); |
| drm_client_for_each_modeset(modeset, client) { |
| modeset->x = var->xoffset; |
| modeset->y = var->yoffset; |
| |
| if (modeset->num_connectors) { |
| ret = drm_mode_set_config_internal(modeset); |
| if (!ret) { |
| info->var.xoffset = var->xoffset; |
| info->var.yoffset = var->yoffset; |
| } |
| } |
| } |
| drm_modeset_unlock_all(fb_helper->dev); |
| mutex_unlock(&client->modeset_mutex); |
| |
| return ret; |
| } |
| |
| /** |
| * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display |
| * @var: updated screen information |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, |
| struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_device *dev = fb_helper->dev; |
| int ret; |
| |
| if (oops_in_progress) |
| return -EBUSY; |
| |
| mutex_lock(&fb_helper->lock); |
| if (!drm_master_internal_acquire(dev)) { |
| ret = -EBUSY; |
| goto unlock; |
| } |
| |
| if (drm_drv_uses_atomic_modeset(dev)) |
| ret = pan_display_atomic(var, info); |
| else |
| ret = pan_display_legacy(var, info); |
| |
| drm_master_internal_release(dev); |
| unlock: |
| mutex_unlock(&fb_helper->lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_pan_display); |
| |
| /* |
| * Allocates the backing storage and sets up the fbdev info structure through |
| * the ->fb_probe callback. |
| */ |
| static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, |
| int preferred_bpp) |
| { |
| struct drm_client_dev *client = &fb_helper->client; |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_mode_config *config = &dev->mode_config; |
| int ret = 0; |
| int crtc_count = 0; |
| struct drm_connector_list_iter conn_iter; |
| struct drm_fb_helper_surface_size sizes; |
| struct drm_connector *connector; |
| struct drm_mode_set *mode_set; |
| int best_depth = 0; |
| |
| memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size)); |
| sizes.surface_depth = 24; |
| sizes.surface_bpp = 32; |
| sizes.fb_width = (u32)-1; |
| sizes.fb_height = (u32)-1; |
| |
| /* |
| * If driver picks 8 or 16 by default use that for both depth/bpp |
| * to begin with |
| */ |
| if (preferred_bpp != sizes.surface_bpp) |
| sizes.surface_depth = sizes.surface_bpp = preferred_bpp; |
| |
| drm_connector_list_iter_begin(fb_helper->dev, &conn_iter); |
| drm_client_for_each_connector_iter(connector, &conn_iter) { |
| struct drm_cmdline_mode *cmdline_mode; |
| |
| cmdline_mode = &connector->cmdline_mode; |
| |
| if (cmdline_mode->bpp_specified) { |
| switch (cmdline_mode->bpp) { |
| case 8: |
| sizes.surface_depth = sizes.surface_bpp = 8; |
| break; |
| case 15: |
| sizes.surface_depth = 15; |
| sizes.surface_bpp = 16; |
| break; |
| case 16: |
| sizes.surface_depth = sizes.surface_bpp = 16; |
| break; |
| case 24: |
| sizes.surface_depth = sizes.surface_bpp = 24; |
| break; |
| case 32: |
| sizes.surface_depth = 24; |
| sizes.surface_bpp = 32; |
| break; |
| } |
| break; |
| } |
| } |
| drm_connector_list_iter_end(&conn_iter); |
| |
| /* |
| * If we run into a situation where, for example, the primary plane |
| * supports RGBA5551 (16 bpp, depth 15) but not RGB565 (16 bpp, depth |
| * 16) we need to scale down the depth of the sizes we request. |
| */ |
| mutex_lock(&client->modeset_mutex); |
| drm_client_for_each_modeset(mode_set, client) { |
| struct drm_crtc *crtc = mode_set->crtc; |
| struct drm_plane *plane = crtc->primary; |
| int j; |
| |
| drm_dbg_kms(dev, "test CRTC %u primary plane\n", drm_crtc_index(crtc)); |
| |
| for (j = 0; j < plane->format_count; j++) { |
| const struct drm_format_info *fmt; |
| |
| fmt = drm_format_info(plane->format_types[j]); |
| |
| /* |
| * Do not consider YUV or other complicated formats |
| * for framebuffers. This means only legacy formats |
| * are supported (fmt->depth is a legacy field) but |
| * the framebuffer emulation can only deal with such |
| * formats, specifically RGB/BGA formats. |
| */ |
| if (fmt->depth == 0) |
| continue; |
| |
| /* We found a perfect fit, great */ |
| if (fmt->depth == sizes.surface_depth) { |
| best_depth = fmt->depth; |
| break; |
| } |
| |
| /* Skip depths above what we're looking for */ |
| if (fmt->depth > sizes.surface_depth) |
| continue; |
| |
| /* Best depth found so far */ |
| if (fmt->depth > best_depth) |
| best_depth = fmt->depth; |
| } |
| } |
| if (sizes.surface_depth != best_depth && best_depth) { |
| drm_info(dev, "requested bpp %d, scaled depth down to %d", |
| sizes.surface_bpp, best_depth); |
| sizes.surface_depth = best_depth; |
| } |
| |
| /* first up get a count of crtcs now in use and new min/maxes width/heights */ |
| crtc_count = 0; |
| drm_client_for_each_modeset(mode_set, client) { |
| struct drm_display_mode *desired_mode; |
| int x, y, j; |
| /* in case of tile group, are we the last tile vert or horiz? |
| * If no tile group you are always the last one both vertically |
| * and horizontally |
| */ |
| bool lastv = true, lasth = true; |
| |
| desired_mode = mode_set->mode; |
| |
| if (!desired_mode) |
| continue; |
| |
| crtc_count++; |
| |
| x = mode_set->x; |
| y = mode_set->y; |
| |
| sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width); |
| sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height); |
| |
| for (j = 0; j < mode_set->num_connectors; j++) { |
| struct drm_connector *connector = mode_set->connectors[j]; |
| |
| if (connector->has_tile && |
| desired_mode->hdisplay == connector->tile_h_size && |
| desired_mode->vdisplay == connector->tile_v_size) { |
| lasth = (connector->tile_h_loc == (connector->num_h_tile - 1)); |
| lastv = (connector->tile_v_loc == (connector->num_v_tile - 1)); |
| /* cloning to multiple tiles is just crazy-talk, so: */ |
| break; |
| } |
| } |
| |
| if (lasth) |
| sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width); |
| if (lastv) |
| sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height); |
| } |
| mutex_unlock(&client->modeset_mutex); |
| |
| if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) { |
| drm_info(dev, "Cannot find any crtc or sizes\n"); |
| |
| /* First time: disable all crtc's.. */ |
| if (!fb_helper->deferred_setup) |
| drm_client_modeset_commit(client); |
| return -EAGAIN; |
| } |
| |
| /* Handle our overallocation */ |
| sizes.surface_height *= drm_fbdev_overalloc; |
| sizes.surface_height /= 100; |
| if (sizes.surface_height > config->max_height) { |
| drm_dbg_kms(dev, "Fbdev over-allocation too large; clamping height to %d\n", |
| config->max_height); |
| sizes.surface_height = config->max_height; |
| } |
| |
| /* push down into drivers */ |
| ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); |
| if (ret < 0) |
| return ret; |
| |
| strcpy(fb_helper->fb->comm, "[fbcon]"); |
| return 0; |
| } |
| |
| static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, |
| uint32_t depth) |
| { |
| info->fix.type = FB_TYPE_PACKED_PIXELS; |
| info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : |
| FB_VISUAL_TRUECOLOR; |
| info->fix.mmio_start = 0; |
| info->fix.mmio_len = 0; |
| info->fix.type_aux = 0; |
| info->fix.xpanstep = 1; /* doing it in hw */ |
| info->fix.ypanstep = 1; /* doing it in hw */ |
| info->fix.ywrapstep = 0; |
| info->fix.accel = FB_ACCEL_NONE; |
| |
| info->fix.line_length = pitch; |
| } |
| |
| static void drm_fb_helper_fill_var(struct fb_info *info, |
| struct drm_fb_helper *fb_helper, |
| uint32_t fb_width, uint32_t fb_height) |
| { |
| struct drm_framebuffer *fb = fb_helper->fb; |
| |
| WARN_ON((drm_format_info_block_width(fb->format, 0) > 1) || |
| (drm_format_info_block_height(fb->format, 0) > 1)); |
| info->pseudo_palette = fb_helper->pseudo_palette; |
| info->var.xres_virtual = fb->width; |
| info->var.yres_virtual = fb->height; |
| info->var.bits_per_pixel = fb->format->cpp[0] * 8; |
| info->var.accel_flags = FB_ACCELF_TEXT; |
| info->var.xoffset = 0; |
| info->var.yoffset = 0; |
| info->var.activate = FB_ACTIVATE_NOW; |
| |
| drm_fb_helper_fill_pixel_fmt(&info->var, fb->format->depth); |
| |
| info->var.xres = fb_width; |
| info->var.yres = fb_height; |
| } |
| |
| /** |
| * drm_fb_helper_fill_info - initializes fbdev information |
| * @info: fbdev instance to set up |
| * @fb_helper: fb helper instance to use as template |
| * @sizes: describes fbdev size and scanout surface size |
| * |
| * Sets up the variable and fixed fbdev metainformation from the given fb helper |
| * instance and the drm framebuffer allocated in &drm_fb_helper.fb. |
| * |
| * Drivers should call this (or their equivalent setup code) from their |
| * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev |
| * backing storage framebuffer. |
| */ |
| void drm_fb_helper_fill_info(struct fb_info *info, |
| struct drm_fb_helper *fb_helper, |
| struct drm_fb_helper_surface_size *sizes) |
| { |
| struct drm_framebuffer *fb = fb_helper->fb; |
| |
| drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth); |
| drm_fb_helper_fill_var(info, fb_helper, |
| sizes->fb_width, sizes->fb_height); |
| |
| info->par = fb_helper; |
| /* |
| * The DRM drivers fbdev emulation device name can be confusing if the |
| * driver name also has a "drm" suffix on it. Leading to names such as |
| * "simpledrmdrmfb" in /proc/fb. Unfortunately, it's an uAPI and can't |
| * be changed due user-space tools (e.g: pm-utils) matching against it. |
| */ |
| snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb", |
| fb_helper->dev->driver->name); |
| |
| } |
| EXPORT_SYMBOL(drm_fb_helper_fill_info); |
| |
| /* |
| * This is a continuation of drm_setup_crtcs() that sets up anything related |
| * to the framebuffer. During initialization, drm_setup_crtcs() is called before |
| * the framebuffer has been allocated (fb_helper->fb and fb_helper->fbdev). |
| * So, any setup that touches those fields needs to be done here instead of in |
| * drm_setup_crtcs(). |
| */ |
| static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper) |
| { |
| struct drm_client_dev *client = &fb_helper->client; |
| struct drm_connector_list_iter conn_iter; |
| struct fb_info *info = fb_helper->fbdev; |
| unsigned int rotation, sw_rotations = 0; |
| struct drm_connector *connector; |
| struct drm_mode_set *modeset; |
| |
| mutex_lock(&client->modeset_mutex); |
| drm_client_for_each_modeset(modeset, client) { |
| if (!modeset->num_connectors) |
| continue; |
| |
| modeset->fb = fb_helper->fb; |
| |
| if (drm_client_rotation(modeset, &rotation)) |
| /* Rotating in hardware, fbcon should not rotate */ |
| sw_rotations |= DRM_MODE_ROTATE_0; |
| else |
| sw_rotations |= rotation; |
| } |
| mutex_unlock(&client->modeset_mutex); |
| |
| drm_connector_list_iter_begin(fb_helper->dev, &conn_iter); |
| drm_client_for_each_connector_iter(connector, &conn_iter) { |
| |
| /* use first connected connector for the physical dimensions */ |
| if (connector->status == connector_status_connected) { |
| info->var.width = connector->display_info.width_mm; |
| info->var.height = connector->display_info.height_mm; |
| break; |
| } |
| } |
| drm_connector_list_iter_end(&conn_iter); |
| |
| switch (sw_rotations) { |
| case DRM_MODE_ROTATE_0: |
| info->fbcon_rotate_hint = FB_ROTATE_UR; |
| break; |
| case DRM_MODE_ROTATE_90: |
| info->fbcon_rotate_hint = FB_ROTATE_CCW; |
| break; |
| case DRM_MODE_ROTATE_180: |
| info->fbcon_rotate_hint = FB_ROTATE_UD; |
| break; |
| case DRM_MODE_ROTATE_270: |
| info->fbcon_rotate_hint = FB_ROTATE_CW; |
| break; |
| default: |
| /* |
| * Multiple bits are set / multiple rotations requested |
| * fbcon cannot handle separate rotation settings per |
| * output, so fallback to unrotated. |
| */ |
| info->fbcon_rotate_hint = FB_ROTATE_UR; |
| } |
| } |
| |
| /* Note: Drops fb_helper->lock before returning. */ |
| static int |
| __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper, |
| int bpp_sel) |
| { |
| struct drm_device *dev = fb_helper->dev; |
| struct fb_info *info; |
| unsigned int width, height; |
| int ret; |
| |
| width = dev->mode_config.max_width; |
| height = dev->mode_config.max_height; |
| |
| drm_client_modeset_probe(&fb_helper->client, width, height); |
| ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); |
| if (ret < 0) { |
| if (ret == -EAGAIN) { |
| fb_helper->preferred_bpp = bpp_sel; |
| fb_helper->deferred_setup = true; |
| ret = 0; |
| } |
| mutex_unlock(&fb_helper->lock); |
| |
| return ret; |
| } |
| drm_setup_crtcs_fb(fb_helper); |
| |
| fb_helper->deferred_setup = false; |
| |
| info = fb_helper->fbdev; |
| info->var.pixclock = 0; |
| /* Shamelessly allow physical address leaking to userspace */ |
| #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM) |
| if (!drm_leak_fbdev_smem) |
| #endif |
| /* don't leak any physical addresses to userspace */ |
| info->flags |= FBINFO_HIDE_SMEM_START; |
| |
| /* Need to drop locks to avoid recursive deadlock in |
| * register_framebuffer. This is ok because the only thing left to do is |
| * register the fbdev emulation instance in kernel_fb_helper_list. */ |
| mutex_unlock(&fb_helper->lock); |
| |
| ret = register_framebuffer(info); |
| if (ret < 0) |
| return ret; |
| |
| drm_info(dev, "fb%d: %s frame buffer device\n", |
| info->node, info->fix.id); |
| |
| mutex_lock(&kernel_fb_helper_lock); |
| if (list_empty(&kernel_fb_helper_list)) |
| register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); |
| |
| list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); |
| mutex_unlock(&kernel_fb_helper_lock); |
| |
| return 0; |
| } |
| |
| /** |
| * drm_fb_helper_initial_config - setup a sane initial connector configuration |
| * @fb_helper: fb_helper device struct |
| * @bpp_sel: bpp value to use for the framebuffer configuration |
| * |
| * Scans the CRTCs and connectors and tries to put together an initial setup. |
| * At the moment, this is a cloned configuration across all heads with |
| * a new framebuffer object as the backing store. |
| * |
| * Note that this also registers the fbdev and so allows userspace to call into |
| * the driver through the fbdev interfaces. |
| * |
| * This function will call down into the &drm_fb_helper_funcs.fb_probe callback |
| * to let the driver allocate and initialize the fbdev info structure and the |
| * drm framebuffer used to back the fbdev. drm_fb_helper_fill_info() is provided |
| * as a helper to setup simple default values for the fbdev info structure. |
| * |
| * HANG DEBUGGING: |
| * |
| * When you have fbcon support built-in or already loaded, this function will do |
| * a full modeset to setup the fbdev console. Due to locking misdesign in the |
| * VT/fbdev subsystem that entire modeset sequence has to be done while holding |
| * console_lock. Until console_unlock is called no dmesg lines will be sent out |
| * to consoles, not even serial console. This means when your driver crashes, |
| * you will see absolutely nothing else but a system stuck in this function, |
| * with no further output. Any kind of printk() you place within your own driver |
| * or in the drm core modeset code will also never show up. |
| * |
| * Standard debug practice is to run the fbcon setup without taking the |
| * console_lock as a hack, to be able to see backtraces and crashes on the |
| * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel |
| * cmdline option. |
| * |
| * The other option is to just disable fbdev emulation since very likely the |
| * first modeset from userspace will crash in the same way, and is even easier |
| * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0 |
| * kernel cmdline option. |
| * |
| * RETURNS: |
| * Zero if everything went ok, nonzero otherwise. |
| */ |
| int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) |
| { |
| int ret; |
| |
| if (!drm_fbdev_emulation) |
| return 0; |
| |
| mutex_lock(&fb_helper->lock); |
| ret = __drm_fb_helper_initial_config_and_unlock(fb_helper, bpp_sel); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_initial_config); |
| |
| /** |
| * drm_fb_helper_hotplug_event - respond to a hotplug notification by |
| * probing all the outputs attached to the fb |
| * @fb_helper: driver-allocated fbdev helper, can be NULL |
| * |
| * Scan the connectors attached to the fb_helper and try to put together a |
| * setup after notification of a change in output configuration. |
| * |
| * Called at runtime, takes the mode config locks to be able to check/change the |
| * modeset configuration. Must be run from process context (which usually means |
| * either the output polling work or a work item launched from the driver's |
| * hotplug interrupt). |
| * |
| * Note that drivers may call this even before calling |
| * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows |
| * for a race-free fbcon setup and will make sure that the fbdev emulation will |
| * not miss any hotplug events. |
| * |
| * RETURNS: |
| * 0 on success and a non-zero error code otherwise. |
| */ |
| int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) |
| { |
| int err = 0; |
| |
| if (!drm_fbdev_emulation || !fb_helper) |
| return 0; |
| |
| mutex_lock(&fb_helper->lock); |
| if (fb_helper->deferred_setup) { |
| err = __drm_fb_helper_initial_config_and_unlock(fb_helper, |
| fb_helper->preferred_bpp); |
| return err; |
| } |
| |
| if (!fb_helper->fb || !drm_master_internal_acquire(fb_helper->dev)) { |
| fb_helper->delayed_hotplug = true; |
| mutex_unlock(&fb_helper->lock); |
| return err; |
| } |
| |
| drm_master_internal_release(fb_helper->dev); |
| |
| drm_dbg_kms(fb_helper->dev, "\n"); |
| |
| drm_client_modeset_probe(&fb_helper->client, fb_helper->fb->width, fb_helper->fb->height); |
| drm_setup_crtcs_fb(fb_helper); |
| mutex_unlock(&fb_helper->lock); |
| |
| drm_fb_helper_set_par(fb_helper->fbdev); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_hotplug_event); |
| |
| /** |
| * drm_fb_helper_lastclose - DRM driver lastclose helper for fbdev emulation |
| * @dev: DRM device |
| * |
| * This function can be used as the &drm_driver->lastclose callback for drivers |
| * that only need to call drm_fb_helper_restore_fbdev_mode_unlocked(). |
| */ |
| void drm_fb_helper_lastclose(struct drm_device *dev) |
| { |
| drm_fb_helper_restore_fbdev_mode_unlocked(dev->fb_helper); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_lastclose); |
| |
| /** |
| * drm_fb_helper_output_poll_changed - DRM mode config \.output_poll_changed |
| * helper for fbdev emulation |
| * @dev: DRM device |
| * |
| * This function can be used as the |
| * &drm_mode_config_funcs.output_poll_changed callback for drivers that only |
| * need to call drm_fb_helper_hotplug_event(). |
| */ |
| void drm_fb_helper_output_poll_changed(struct drm_device *dev) |
| { |
| drm_fb_helper_hotplug_event(dev->fb_helper); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_output_poll_changed); |
| |
| /* @user: 1=userspace, 0=fbcon */ |
| static int drm_fbdev_fb_open(struct fb_info *info, int user) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| |
| /* No need to take a ref for fbcon because it unbinds on unregister */ |
| if (user && !try_module_get(fb_helper->dev->driver->fops->owner)) |
| return -ENODEV; |
| |
| return 0; |
| } |
| |
| static int drm_fbdev_fb_release(struct fb_info *info, int user) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| |
| if (user) |
| module_put(fb_helper->dev->driver->fops->owner); |
| |
| return 0; |
| } |
| |
| static void drm_fbdev_cleanup(struct drm_fb_helper *fb_helper) |
| { |
| struct fb_info *fbi = fb_helper->fbdev; |
| void *shadow = NULL; |
| |
| if (!fb_helper->dev) |
| return; |
| |
| if (fbi) { |
| if (fbi->fbdefio) |
| fb_deferred_io_cleanup(fbi); |
| if (drm_fbdev_use_shadow_fb(fb_helper)) |
| shadow = fbi->screen_buffer; |
| } |
| |
| drm_fb_helper_fini(fb_helper); |
| |
| if (shadow) |
| vfree(shadow); |
| else if (fb_helper->buffer) |
| drm_client_buffer_vunmap(fb_helper->buffer); |
| |
| drm_client_framebuffer_delete(fb_helper->buffer); |
| } |
| |
| static void drm_fbdev_release(struct drm_fb_helper *fb_helper) |
| { |
| drm_fbdev_cleanup(fb_helper); |
| drm_client_release(&fb_helper->client); |
| kfree(fb_helper); |
| } |
| |
| /* |
| * fb_ops.fb_destroy is called by the last put_fb_info() call at the end of |
| * unregister_framebuffer() or fb_release(). |
| */ |
| static void drm_fbdev_fb_destroy(struct fb_info *info) |
| { |
| drm_fbdev_release(info->par); |
| } |
| |
| static int drm_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| |
| if (drm_fbdev_use_shadow_fb(fb_helper)) |
| return fb_deferred_io_mmap(info, vma); |
| else if (fb_helper->dev->driver->gem_prime_mmap) |
| return fb_helper->dev->driver->gem_prime_mmap(fb_helper->buffer->gem, vma); |
| else |
| return -ENODEV; |
| } |
| |
| static bool drm_fbdev_use_iomem(struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_client_buffer *buffer = fb_helper->buffer; |
| |
| return !drm_fbdev_use_shadow_fb(fb_helper) && buffer->map.is_iomem; |
| } |
| |
| static ssize_t fb_read_screen_base(struct fb_info *info, char __user *buf, size_t count, |
| loff_t pos) |
| { |
| const char __iomem *src = info->screen_base + pos; |
| size_t alloc_size = min_t(size_t, count, PAGE_SIZE); |
| ssize_t ret = 0; |
| int err = 0; |
| char *tmp; |
| |
| tmp = kmalloc(alloc_size, GFP_KERNEL); |
| if (!tmp) |
| return -ENOMEM; |
| |
| while (count) { |
| size_t c = min_t(size_t, count, alloc_size); |
| |
| memcpy_fromio(tmp, src, c); |
| if (copy_to_user(buf, tmp, c)) { |
| err = -EFAULT; |
| break; |
| } |
| |
| src += c; |
| buf += c; |
| ret += c; |
| count -= c; |
| } |
| |
| kfree(tmp); |
| |
| return ret ? ret : err; |
| } |
| |
| static ssize_t fb_read_screen_buffer(struct fb_info *info, char __user *buf, size_t count, |
| loff_t pos) |
| { |
| const char *src = info->screen_buffer + pos; |
| |
| if (copy_to_user(buf, src, count)) |
| return -EFAULT; |
| |
| return count; |
| } |
| |
| static ssize_t drm_fbdev_fb_read(struct fb_info *info, char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| loff_t pos = *ppos; |
| size_t total_size; |
| ssize_t ret; |
| |
| if (info->screen_size) |
| total_size = info->screen_size; |
| else |
| total_size = info->fix.smem_len; |
| |
| if (pos >= total_size) |
| return 0; |
| if (count >= total_size) |
| count = total_size; |
| if (total_size - count < pos) |
| count = total_size - pos; |
| |
| if (drm_fbdev_use_iomem(info)) |
| ret = fb_read_screen_base(info, buf, count, pos); |
| else |
| ret = fb_read_screen_buffer(info, buf, count, pos); |
| |
| if (ret > 0) |
| *ppos += ret; |
| |
| return ret; |
| } |
| |
| static ssize_t fb_write_screen_base(struct fb_info *info, const char __user *buf, size_t count, |
| loff_t pos) |
| { |
| char __iomem *dst = info->screen_base + pos; |
| size_t alloc_size = min_t(size_t, count, PAGE_SIZE); |
| ssize_t ret = 0; |
| int err = 0; |
| u8 *tmp; |
| |
| tmp = kmalloc(alloc_size, GFP_KERNEL); |
| if (!tmp) |
| return -ENOMEM; |
| |
| while (count) { |
| size_t c = min_t(size_t, count, alloc_size); |
| |
| if (copy_from_user(tmp, buf, c)) { |
| err = -EFAULT; |
| break; |
| } |
| memcpy_toio(dst, tmp, c); |
| |
| dst += c; |
| buf += c; |
| ret += c; |
| count -= c; |
| } |
| |
| kfree(tmp); |
| |
| return ret ? ret : err; |
| } |
| |
| static ssize_t fb_write_screen_buffer(struct fb_info *info, const char __user *buf, size_t count, |
| loff_t pos) |
| { |
| char *dst = info->screen_buffer + pos; |
| |
| if (copy_from_user(dst, buf, count)) |
| return -EFAULT; |
| |
| return count; |
| } |
| |
| static ssize_t drm_fbdev_fb_write(struct fb_info *info, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| loff_t pos = *ppos; |
| size_t total_size; |
| ssize_t ret; |
| struct drm_rect damage_area; |
| int err = 0; |
| |
| if (info->screen_size) |
| total_size = info->screen_size; |
| else |
| total_size = info->fix.smem_len; |
| |
| if (pos > total_size) |
| return -EFBIG; |
| if (count > total_size) { |
| err = -EFBIG; |
| count = total_size; |
| } |
| if (total_size - count < pos) { |
| if (!err) |
| err = -ENOSPC; |
| count = total_size - pos; |
| } |
| |
| /* |
| * Copy to framebuffer even if we already logged an error. Emulates |
| * the behavior of the original fbdev implementation. |
| */ |
| if (drm_fbdev_use_iomem(info)) |
| ret = fb_write_screen_base(info, buf, count, pos); |
| else |
| ret = fb_write_screen_buffer(info, buf, count, pos); |
| |
| if (ret < 0) |
| return ret; /* return last error, if any */ |
| else if (!ret) |
| return err; /* return previous error, if any */ |
| |
| *ppos += ret; |
| |
| drm_fb_helper_memory_range_to_clip(info, pos, ret, &damage_area); |
| drm_fb_helper_damage(info, damage_area.x1, damage_area.y1, |
| drm_rect_width(&damage_area), |
| drm_rect_height(&damage_area)); |
| |
| return ret; |
| } |
| |
| static void drm_fbdev_fb_fillrect(struct fb_info *info, |
| const struct fb_fillrect *rect) |
| { |
| if (drm_fbdev_use_iomem(info)) |
| drm_fb_helper_cfb_fillrect(info, rect); |
| else |
| drm_fb_helper_sys_fillrect(info, rect); |
| } |
| |
| static void drm_fbdev_fb_copyarea(struct fb_info *info, |
| const struct fb_copyarea *area) |
| { |
| if (drm_fbdev_use_iomem(info)) |
| drm_fb_helper_cfb_copyarea(info, area); |
| else |
| drm_fb_helper_sys_copyarea(info, area); |
| } |
| |
| static void drm_fbdev_fb_imageblit(struct fb_info *info, |
| const struct fb_image *image) |
| { |
| if (drm_fbdev_use_iomem(info)) |
| drm_fb_helper_cfb_imageblit(info, image); |
| else |
| drm_fb_helper_sys_imageblit(info, image); |
| } |
| |
| static const struct fb_ops drm_fbdev_fb_ops = { |
| .owner = THIS_MODULE, |
| DRM_FB_HELPER_DEFAULT_OPS, |
| .fb_open = drm_fbdev_fb_open, |
| .fb_release = drm_fbdev_fb_release, |
| .fb_destroy = drm_fbdev_fb_destroy, |
| .fb_mmap = drm_fbdev_fb_mmap, |
| .fb_read = drm_fbdev_fb_read, |
| .fb_write = drm_fbdev_fb_write, |
| .fb_fillrect = drm_fbdev_fb_fillrect, |
| .fb_copyarea = drm_fbdev_fb_copyarea, |
| .fb_imageblit = drm_fbdev_fb_imageblit, |
| }; |
| |
| static struct fb_deferred_io drm_fbdev_defio = { |
| .delay = HZ / 20, |
| .deferred_io = drm_fb_helper_deferred_io, |
| }; |
| |
| /* |
| * This function uses the client API to create a framebuffer backed by a dumb buffer. |
| * |
| * The _sys_ versions are used for &fb_ops.fb_read, fb_write, fb_fillrect, |
| * fb_copyarea, fb_imageblit. |
| */ |
| static int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper, |
| struct drm_fb_helper_surface_size *sizes) |
| { |
| struct drm_client_dev *client = &fb_helper->client; |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_client_buffer *buffer; |
| struct drm_framebuffer *fb; |
| struct fb_info *fbi; |
| u32 format; |
| struct iosys_map map; |
| int ret; |
| |
| drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n", |
| sizes->surface_width, sizes->surface_height, |
| sizes->surface_bpp); |
| |
| format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); |
| buffer = drm_client_framebuffer_create(client, sizes->surface_width, |
| sizes->surface_height, format); |
| if (IS_ERR(buffer)) |
| return PTR_ERR(buffer); |
| |
| fb_helper->buffer = buffer; |
| fb_helper->fb = buffer->fb; |
| fb = buffer->fb; |
| |
| fbi = drm_fb_helper_alloc_fbi(fb_helper); |
| if (IS_ERR(fbi)) |
| return PTR_ERR(fbi); |
| |
| fbi->fbops = &drm_fbdev_fb_ops; |
| fbi->screen_size = sizes->surface_height * fb->pitches[0]; |
| fbi->fix.smem_len = fbi->screen_size; |
| fbi->flags = FBINFO_DEFAULT; |
| |
| drm_fb_helper_fill_info(fbi, fb_helper, sizes); |
| |
| if (drm_fbdev_use_shadow_fb(fb_helper)) { |
| fbi->screen_buffer = vzalloc(fbi->screen_size); |
| if (!fbi->screen_buffer) |
| return -ENOMEM; |
| fbi->flags |= FBINFO_VIRTFB | FBINFO_READS_FAST; |
| |
| fbi->fbdefio = &drm_fbdev_defio; |
| fb_deferred_io_init(fbi); |
| } else { |
| /* buffer is mapped for HW framebuffer */ |
| ret = drm_client_buffer_vmap(fb_helper->buffer, &map); |
| if (ret) |
| return ret; |
| if (map.is_iomem) { |
| fbi->screen_base = map.vaddr_iomem; |
| } else { |
| fbi->screen_buffer = map.vaddr; |
| fbi->flags |= FBINFO_VIRTFB; |
| } |
| |
| /* |
| * Shamelessly leak the physical address to user-space. As |
| * page_to_phys() is undefined for I/O memory, warn in this |
| * case. |
| */ |
| #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM) |
| if (drm_leak_fbdev_smem && fbi->fix.smem_start == 0 && |
| !drm_WARN_ON_ONCE(dev, map.is_iomem)) |
| fbi->fix.smem_start = |
| page_to_phys(virt_to_page(fbi->screen_buffer)); |
| #endif |
| } |
| |
| return 0; |
| } |
| |
| static const struct drm_fb_helper_funcs drm_fb_helper_generic_funcs = { |
| .fb_probe = drm_fb_helper_generic_probe, |
| }; |
| |
| static void drm_fbdev_client_unregister(struct drm_client_dev *client) |
| { |
| struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); |
| |
| if (fb_helper->fbdev) |
| /* drm_fbdev_fb_destroy() takes care of cleanup */ |
| drm_fb_helper_unregister_fbi(fb_helper); |
| else |
| drm_fbdev_release(fb_helper); |
| } |
| |
| static int drm_fbdev_client_restore(struct drm_client_dev *client) |
| { |
| drm_fb_helper_lastclose(client->dev); |
| |
| return 0; |
| } |
| |
| static int drm_fbdev_client_hotplug(struct drm_client_dev *client) |
| { |
| struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); |
| struct drm_device *dev = client->dev; |
| int ret; |
| |
| /* Setup is not retried if it has failed */ |
| if (!fb_helper->dev && fb_helper->funcs) |
| return 0; |
| |
| if (dev->fb_helper) |
| return drm_fb_helper_hotplug_event(dev->fb_helper); |
| |
| if (!dev->mode_config.num_connector) { |
| drm_dbg_kms(dev, "No connectors found, will not create framebuffer!\n"); |
| return 0; |
| } |
| |
| drm_fb_helper_prepare(dev, fb_helper, &drm_fb_helper_generic_funcs); |
| |
| ret = drm_fb_helper_init(dev, fb_helper); |
| if (ret) |
| goto err; |
| |
| if (!drm_drv_uses_atomic_modeset(dev)) |
| drm_helper_disable_unused_functions(dev); |
| |
| ret = drm_fb_helper_initial_config(fb_helper, fb_helper->preferred_bpp); |
| if (ret) |
| goto err_cleanup; |
| |
| return 0; |
| |
| err_cleanup: |
| drm_fbdev_cleanup(fb_helper); |
| err: |
| fb_helper->dev = NULL; |
| fb_helper->fbdev = NULL; |
| |
| drm_err(dev, "fbdev: Failed to setup generic emulation (ret=%d)\n", ret); |
| |
| return ret; |
| } |
| |
| static const struct drm_client_funcs drm_fbdev_client_funcs = { |
| .owner = THIS_MODULE, |
| .unregister = drm_fbdev_client_unregister, |
| .restore = drm_fbdev_client_restore, |
| .hotplug = drm_fbdev_client_hotplug, |
| }; |
| |
| /** |
| * drm_fbdev_generic_setup() - Setup generic fbdev emulation |
| * @dev: DRM device |
| * @preferred_bpp: Preferred bits per pixel for the device. |
| * @dev->mode_config.preferred_depth is used if this is zero. |
| * |
| * This function sets up generic fbdev emulation for drivers that supports |
| * dumb buffers with a virtual address and that can be mmap'ed. |
| * drm_fbdev_generic_setup() shall be called after the DRM driver registered |
| * the new DRM device with drm_dev_register(). |
| * |
| * Restore, hotplug events and teardown are all taken care of. Drivers that do |
| * suspend/resume need to call drm_fb_helper_set_suspend_unlocked() themselves. |
| * Simple drivers might use drm_mode_config_helper_suspend(). |
| * |
| * Drivers that set the dirty callback on their framebuffer will get a shadow |
| * fbdev buffer that is blitted onto the real buffer. This is done in order to |
| * make deferred I/O work with all kinds of buffers. A shadow buffer can be |
| * requested explicitly by setting struct drm_mode_config.prefer_shadow or |
| * struct drm_mode_config.prefer_shadow_fbdev to true beforehand. This is |
| * required to use generic fbdev emulation with SHMEM helpers. |
| * |
| * This function is safe to call even when there are no connectors present. |
| * Setup will be retried on the next hotplug event. |
| * |
| * The fbdev is destroyed by drm_dev_unregister(). |
| */ |
| void drm_fbdev_generic_setup(struct drm_device *dev, |
| unsigned int preferred_bpp) |
| { |
| struct drm_fb_helper *fb_helper; |
| int ret; |
| |
| drm_WARN(dev, !dev->registered, "Device has not been registered.\n"); |
| drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); |
| |
| if (!drm_fbdev_emulation) |
| return; |
| |
| fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL); |
| if (!fb_helper) { |
| drm_err(dev, "Failed to allocate fb_helper\n"); |
| return; |
| } |
| |
| ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs); |
| if (ret) { |
| kfree(fb_helper); |
| drm_err(dev, "Failed to register client: %d\n", ret); |
| return; |
| } |
| |
| /* |
| * FIXME: This mixes up depth with bpp, which results in a glorious |
| * mess, resulting in some drivers picking wrong fbdev defaults and |
| * others wrong preferred_depth defaults. |
| */ |
| if (!preferred_bpp) |
| preferred_bpp = dev->mode_config.preferred_depth; |
| if (!preferred_bpp) |
| preferred_bpp = 32; |
| fb_helper->preferred_bpp = preferred_bpp; |
| |
| ret = drm_fbdev_client_hotplug(&fb_helper->client); |
| if (ret) |
| drm_dbg_kms(dev, "client hotplug ret=%d\n", ret); |
| |
| drm_client_register(&fb_helper->client); |
| } |
| EXPORT_SYMBOL(drm_fbdev_generic_setup); |