/* * 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
staticint 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 to support closed-source OpenGL * drivers 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.
*/ staticbool drm_leak_fbdev_smem; #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
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
/** * 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 use one of the shared memory managers, TTM, SHMEM, * DMA, should instead use the corresponding fbdev emulation. * * 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.
*/
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);
if (fb_helper->funcs->fb_restore)
fb_helper->funcs->fb_restore(fb_helper);
return ret;
}
/** * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration * @fb_helper: driver-allocated fbdev helper, can be NULL * * This helper should be called from fbdev emulation's &drm_client_funcs.restore * callback. It ensures that the user isn't greeted with a black screen when the * userspace compositor releases the display device. * * Returns: * 0 on success, or a negative errno 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);
/** * drm_fb_helper_prepare - setup a drm_fb_helper structure * @dev: DRM device * @helper: driver-allocated fbdev helper structure to set up * @preferred_bpp: Preferred bits per pixel for the device. * @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, unsignedint preferred_bpp, conststruct drm_fb_helper_funcs *funcs)
{ /* * Pick a preferred bpp of 32 if no value has been given. This * will select XRGB8888 for the framebuffer formats. All drivers * have to support XRGB8888 for backwards compatibility with legacy * userspace, so it's the safe choice here. * * TODO: Replace struct drm_mode_config.preferred_depth and this * bpp value with a preferred format that is given as struct * drm_format_info. Then derive all other values from the * format.
*/ if (!preferred_bpp)
preferred_bpp = 32;
/** * drm_fb_helper_unprepare - clean up a drm_fb_helper structure * @fb_helper: driver-allocated fbdev helper structure to set up * * Cleans up the framebuffer helper. Inverse of drm_fb_helper_prepare().
*/ void drm_fb_helper_unprepare(struct drm_fb_helper *fb_helper)
{
mutex_destroy(&fb_helper->lock);
}
EXPORT_SYMBOL(drm_fb_helper_unprepare);
/** * 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 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_info - allocate fb_info and some of its members * @fb_helper: driver-allocated fbdev helper * * A helper to alloc fb_info and the member cmap. Called by the driver * within the struct &drm_driver.fbdev_probe 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_info(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);
if (!drm_leak_fbdev_smem)
info->flags |= FBINFO_HIDE_SMEM_START;
ret = fb_alloc_cmap(&info->cmap, 256, 0); if (ret) goto err_release;
/** * drm_fb_helper_release_info - release fb_info and its members * @fb_helper: driver-allocated fbdev helper * * A helper to release fb_info and the member cmap. Drivers do not * need to release the allocated fb_info structure themselves, this is * automatically done when calling drm_fb_helper_fini().
*/ void drm_fb_helper_release_info(struct drm_fb_helper *fb_helper)
{ struct fb_info *info = fb_helper->info;
if (!info) return;
fb_helper->info = NULL;
if (info->cmap.len)
fb_dealloc_cmap(&info->cmap);
framebuffer_release(info);
}
EXPORT_SYMBOL(drm_fb_helper_release_info);
/** * drm_fb_helper_unregister_info - unregister fb_info framebuffer device * @fb_helper: driver-allocated fbdev helper, must not 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_info(struct drm_fb_helper *fb_helper)
{ struct fb_info *info = fb_helper->info; struct device *dev = info->device;
if (dev_is_pci(dev))
vga_switcheroo_client_fb_set(to_pci_dev(dev), NULL);
unregister_framebuffer(fb_helper->info);
}
EXPORT_SYMBOL(drm_fb_helper_unregister_info);
/** * 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)
{ if (!fb_helper) return;
staticvoid drm_fb_helper_damage(struct drm_fb_helper *helper, u32 x, u32 y,
u32 width, u32 height)
{ /* * This function may be invoked by panic() to flush the frame * buffer, where all CPUs except the panic CPU are stopped. * During the following schedule_work(), the panic CPU needs * the worker_pool lock, which might be held by a stopped CPU, * causing schedule_work() and panic() to block. Return early on * oops_in_progress to prevent this blocking.
*/ if (oops_in_progress) return;
drm_fb_helper_add_damage_clip(helper, x, y, width, height);
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.
*/ staticvoid drm_fb_helper_memory_range_to_clip(struct fb_info *info, off_t off, size_t len, struct drm_rect *clip)
{
u32 line_length = info->fix.line_length;
u32 fb_height = info->var.yres;
off_t end = off + len;
u32 x1 = 0;
u32 y1 = off / line_length;
u32 x2 = info->var.xres;
u32 y2 = DIV_ROUND_UP(end, line_length);
/* Don't allow any of them beyond the bottom bound of display area */ if (y1 > fb_height)
y1 = fb_height; if (y2 > fb_height)
y2 = fb_height;
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 % line_length) * 8;
off_t bit_end = (end % line_length) * 8;
/* Don't use in new code. */ void drm_fb_helper_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height)
{ struct drm_fb_helper *fb_helper = info->par;
drm_fb_helper_damage(fb_helper, x, y, width, height);
}
EXPORT_SYMBOL(drm_fb_helper_damage_area);
#ifdef CONFIG_FB_DEFERRED_IO /** * 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)
{ struct drm_fb_helper *helper = info->par; unsignedlong start, end, min_off, max_off, total_size; struct fb_deferred_io_pageref *pageref; struct drm_rect damage_area;
/* * 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.
*/ if (info->screen_size)
total_size = info->screen_size; else
total_size = info->fix.smem_len;
max_off = min(max_off, total_size);
/** * 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->info) return;
if (fb_helper->funcs->fb_set_suspend)
fb_helper->funcs->fb_set_suspend(fb_helper, suspend); else
fb_set_suspend(fb_helper->info, 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->info) return;
/* make sure there's no pending/ongoing resume */
flush_work(&fb_helper->resume_work);
if (suspend) { if (fb_helper->info->state != FBINFO_STATE_RUNNING) return;
console_lock();
} else { if (fb_helper->info->state == FBINFO_STATE_RUNNING) return;
if (!console_trylock()) {
schedule_work(&fb_helper->resume_work); return;
}
}
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_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, unsignedint cmd, unsignedlong 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);
}
/** * 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; conststruct drm_format_info *format = fb->format; struct drm_device *dev = fb_helper->dev; unsignedint bpp;
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;
}
switch (format->format) { case DRM_FORMAT_C1: case DRM_FORMAT_C2: case DRM_FORMAT_C4: /* supported format with sub-byte pixels */ break;
/* * Changes struct fb_var_screeninfo are currently not pushed back * to KMS, hence fail if different settings are requested.
*/
bpp = drm_format_info_bpp(format, 0); if (var->bits_per_pixel > bpp ||
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, bpp); return -EINVAL;
}
__fill_var(var, info, fb);
/* * fb_pan_display() validates this, but fb_set_par() doesn't and just * falls over. Note that __fill_var above adjusts y/res_virtual.
*/ if (var->yoffset > var->yres_virtual - var->yres ||
var->xoffset > var->xres_virtual - var->xres) return -EINVAL;
/* We neither support grayscale nor FOURCC (also stored in here). */ if (var->grayscale > 0) return -EINVAL;
if (var->nonstd) 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, format);
}
/* * 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;
}
/** * 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;
/* * 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;
format = drm_driver_color_mode_format(dev, color_mode); if (!format) {
drm_info(dev, "unsupported color mode of %d\n", color_mode); return DRM_FORMAT_INVALID;
}
for (i = 0; i < format_count; ++i) { if (formats[i] == format) return format;
}
drm_warn(dev, "format %p4cc not supported\n", &format);
surface_format = drm_fb_helper_find_format(fb_helper,
plane->format_types,
plane->format_count,
cmdline_mode->bpp); if (surface_format != DRM_FORMAT_INVALID) break; /* found supported format */
}
drm_connector_list_iter_end(&conn_iter);
if (surface_format != DRM_FORMAT_INVALID) break; /* found supported format */
/* try preferred color mode */
surface_format = drm_fb_helper_find_format(fb_helper,
plane->format_types,
plane->format_count,
fb_helper->preferred_bpp); if (surface_format != DRM_FORMAT_INVALID) break; /* found supported format */
}
if (surface_format == DRM_FORMAT_INVALID) { /* * If none of the given color modes works, fall back * to XRGB8888. Drivers are expected to provide this * format for compatibility with legacy applications.
*/
drm_warn(dev, "No compatible format found\n");
surface_format = drm_driver_legacy_fb_format(dev, 32, 24);
}
info = drm_format_info(surface_format);
sizes->surface_bpp = drm_format_info_bpp(info, 0);
sizes->surface_depth = info->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;
mutex_lock(&client->modeset_mutex);
ret = __drm_fb_helper_find_sizes(fb_helper, sizes);
mutex_unlock(&client->modeset_mutex);
if (ret) return ret;
/* 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;
}
return 0;
}
/* * Allocates the backing storage and sets up the fbdev info structure through * the ->fbdev_probe callback.
*/ staticint drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
{ struct drm_client_dev *client = &fb_helper->client; struct drm_device *dev = fb_helper->dev; struct drm_fb_helper_surface_size sizes; struct fb_info *info; int ret;
if (drm_WARN_ON(dev, !dev->driver->fbdev_probe)) return -EINVAL;
ret = drm_fb_helper_find_sizes(fb_helper, &sizes); if (ret) { /* First time: disable all crtc's.. */ if (!fb_helper->deferred_setup)
drm_client_modeset_commit(client); return ret;
}
/* push down into drivers */
ret = dev->driver->fbdev_probe(fb_helper, &sizes); if (ret < 0) return ret;
strcpy(fb_helper->fb->comm, "[fbcon]");
info = fb_helper->info;
/* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */ if (dev_is_pci(info->device))
vga_switcheroo_client_fb_set(to_pci_dev(info->device), info);
/** * 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_driver.fbdev_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;
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->info). * So, any setup that touches those fields needs to be done here instead of in * drm_setup_crtcs().
*/ staticvoid 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->info; unsignedint 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);
/* 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;
}
}
drm_client_modeset_probe(&fb_helper->client, width, height);
ret = drm_fb_helper_single_fb_probe(fb_helper); if (ret < 0) { if (ret == -EAGAIN) {
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->info;
info->var.pixclock = 0;
/* 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_fb_helper_initial_config - setup a sane initial connector configuration * @fb_helper: fb_helper device struct * * 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_driver.fbdev_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 ret;
if (!drm_fbdev_emulation) return 0;
mutex_lock(&fb_helper->lock);
ret = __drm_fb_helper_initial_config_and_unlock(fb_helper);
/** * 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); return err;
}
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