From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/gpu/drm/drm_fb_helper.c | 3293 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 3293 insertions(+) create mode 100644 drivers/gpu/drm/drm_fb_helper.c (limited to 'drivers/gpu/drm/drm_fb_helper.c') diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c new file mode 100644 index 000000000..da9a381d6 --- /dev/null +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -0,0 +1,3293 @@ +/* + * Copyright (c) 2006-2009 Red Hat Inc. + * Copyright (c) 2006-2008 Intel Corporation + * Copyright (c) 2007 Dave Airlie + * + * 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 + * Jesse Barnes + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "drm_crtc_internal.h" +#include "drm_crtc_helper_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(fbdev_emulation, + "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(). + * + * Setup fbdev emulation by calling drm_fb_helper_fbdev_setup() and tear it + * down by calling drm_fb_helper_fbdev_teardown(). + * + * Drivers that need to handle connector hotplugging (e.g. dp mst) can't use + * the setup helper and will need to do the whole four-step setup process with + * drm_fb_helper_prepare(), drm_fb_helper_init(), + * drm_fb_helper_single_add_all_connectors(), enable hotplugging and + * drm_fb_helper_initial_config() to avoid a possible race window. + * + * 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_single_add_all_connectors() followed by + * 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. Drivers can use drm_fb_helper_defio_init() to setup + * deferred I/O (coupled with drm_fb_helper_fbdev_teardown()). + */ + +#define drm_fb_helper_for_each_connector(fbh, i__) \ + for (({ lockdep_assert_held(&(fbh)->lock); }), \ + i__ = 0; i__ < (fbh)->connector_count; i__++) + +static int __drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, + struct drm_connector *connector) +{ + struct drm_fb_helper_connector *fb_conn; + struct drm_fb_helper_connector **temp; + unsigned int count; + + if (!drm_fbdev_emulation) + return 0; + + lockdep_assert_held(&fb_helper->lock); + + count = fb_helper->connector_count + 1; + + if (count > fb_helper->connector_info_alloc_count) { + size_t size = count * sizeof(fb_conn); + + temp = krealloc(fb_helper->connector_info, size, GFP_KERNEL); + if (!temp) + return -ENOMEM; + + fb_helper->connector_info_alloc_count = count; + fb_helper->connector_info = temp; + } + + fb_conn = kzalloc(sizeof(*fb_conn), GFP_KERNEL); + if (!fb_conn) + return -ENOMEM; + + drm_connector_get(connector); + fb_conn->connector = connector; + fb_helper->connector_info[fb_helper->connector_count++] = fb_conn; + + return 0; +} + +int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, + struct drm_connector *connector) +{ + int err; + + if (!fb_helper) + return 0; + + mutex_lock(&fb_helper->lock); + err = __drm_fb_helper_add_one_connector(fb_helper, connector); + mutex_unlock(&fb_helper->lock); + + return err; +} +EXPORT_SYMBOL(drm_fb_helper_add_one_connector); + +/** + * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev + * emulation helper + * @fb_helper: fbdev initialized with drm_fb_helper_init, can be NULL + * + * This functions adds all the available connectors for use with the given + * fb_helper. This is a separate step to allow drivers to freely assign + * connectors to the fbdev, e.g. if some are reserved for special purposes or + * not adequate to be used for the fbcon. + * + * This function is protected against concurrent connector hotadds/removals + * using drm_fb_helper_add_one_connector() and + * drm_fb_helper_remove_one_connector(). + */ +int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) +{ + struct drm_device *dev; + struct drm_connector *connector; + struct drm_connector_list_iter conn_iter; + int i, ret = 0; + + if (!drm_fbdev_emulation || !fb_helper) + return 0; + + dev = fb_helper->dev; + + mutex_lock(&fb_helper->lock); + drm_connector_list_iter_begin(dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) { + if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK) + continue; + + ret = __drm_fb_helper_add_one_connector(fb_helper, connector); + if (ret) + goto fail; + } + goto out; + +fail: + drm_fb_helper_for_each_connector(fb_helper, i) { + struct drm_fb_helper_connector *fb_helper_connector = + fb_helper->connector_info[i]; + + drm_connector_put(fb_helper_connector->connector); + + kfree(fb_helper_connector); + fb_helper->connector_info[i] = NULL; + } + fb_helper->connector_count = 0; +out: + drm_connector_list_iter_end(&conn_iter); + mutex_unlock(&fb_helper->lock); + + return ret; +} +EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors); + +static int __drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, + struct drm_connector *connector) +{ + struct drm_fb_helper_connector *fb_helper_connector; + int i, j; + + if (!drm_fbdev_emulation) + return 0; + + lockdep_assert_held(&fb_helper->lock); + + drm_fb_helper_for_each_connector(fb_helper, i) { + if (fb_helper->connector_info[i]->connector == connector) + break; + } + + if (i == fb_helper->connector_count) + return -EINVAL; + fb_helper_connector = fb_helper->connector_info[i]; + drm_connector_put(fb_helper_connector->connector); + + for (j = i + 1; j < fb_helper->connector_count; j++) + fb_helper->connector_info[j - 1] = fb_helper->connector_info[j]; + + fb_helper->connector_count--; + kfree(fb_helper_connector); + + return 0; +} + +int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, + struct drm_connector *connector) +{ + int err; + + if (!fb_helper) + return 0; + + mutex_lock(&fb_helper->lock); + err = __drm_fb_helper_remove_one_connector(fb_helper, connector); + mutex_unlock(&fb_helper->lock); + + return err; +} +EXPORT_SYMBOL(drm_fb_helper_remove_one_connector); + +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; + int i; + + list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { + for (i = 0; i < helper->crtc_count; i++) { + struct drm_mode_set *mode_set = + &helper->crtc_info[i].mode_set; + + 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); + } + } + + 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_crtc *crtc; + const struct drm_crtc_helper_funcs *funcs; + struct drm_framebuffer *fb; + int i; + + for (i = 0; i < helper->crtc_count; i++) { + struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set; + + 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_ERROR("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); + } + + return 0; +} +EXPORT_SYMBOL(drm_fb_helper_debug_leave); + +static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper, bool active) +{ + struct drm_device *dev = fb_helper->dev; + struct drm_plane_state *plane_state; + struct drm_plane *plane; + struct drm_atomic_state *state; + int i, ret; + struct drm_modeset_acquire_ctx ctx; + + 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_for_each_plane(plane, dev) { + plane_state = drm_atomic_get_plane_state(state, plane); + if (IS_ERR(plane_state)) { + ret = PTR_ERR(plane_state); + goto out_state; + } + + plane_state->rotation = DRM_MODE_ROTATE_0; + + /* disable non-primary: */ + if (plane->type == DRM_PLANE_TYPE_PRIMARY) + continue; + + ret = __drm_atomic_helper_disable_plane(plane, plane_state); + if (ret != 0) + goto out_state; + } + + for (i = 0; i < fb_helper->crtc_count; i++) { + struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; + struct drm_plane *primary = mode_set->crtc->primary; + + /* Cannot fail as we've already gotten the plane state above */ + plane_state = drm_atomic_get_new_plane_state(state, primary); + plane_state->rotation = fb_helper->crtc_info[i].rotation; + + ret = __drm_atomic_helper_set_config(mode_set, state); + if (ret != 0) + goto out_state; + + /* + * __drm_atomic_helper_set_config() sets active when a + * mode is set, unconditionally clear it if we force DPMS off + */ + if (!active) { + struct drm_crtc *crtc = mode_set->crtc; + struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc); + + crtc_state->active = false; + } + } + + ret = drm_atomic_commit(state); + +out_state: + if (ret == -EDEADLK) + goto backoff; + + 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; +} + +static int restore_fbdev_mode_legacy(struct drm_fb_helper *fb_helper) +{ + struct drm_device *dev = fb_helper->dev; + struct drm_plane *plane; + int i, ret = 0; + + drm_modeset_lock_all(fb_helper->dev); + drm_for_each_plane(plane, dev) { + if (plane->type != DRM_PLANE_TYPE_PRIMARY) + drm_plane_force_disable(plane); + + if (plane->rotation_property) + drm_mode_plane_set_obj_prop(plane, + plane->rotation_property, + DRM_MODE_ROTATE_0); + } + + for (i = 0; i < fb_helper->crtc_count; i++) { + struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; + struct drm_crtc *crtc = mode_set->crtc; + + if (crtc->funcs->cursor_set2) { + ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0); + if (ret) + goto out; + } else if (crtc->funcs->cursor_set) { + ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0); + if (ret) + goto out; + } + + ret = drm_mode_set_config_internal(mode_set); + if (ret) + goto out; + } +out: + drm_modeset_unlock_all(fb_helper->dev); + + return ret; +} + +static int restore_fbdev_mode(struct drm_fb_helper *fb_helper) +{ + struct drm_device *dev = fb_helper->dev; + + if (drm_drv_uses_atomic_modeset(dev)) + return restore_fbdev_mode_atomic(fb_helper, true); + else + return restore_fbdev_mode_legacy(fb_helper); +} + +/** + * 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) +{ + 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); + ret = restore_fbdev_mode(fb_helper); + + 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; +} +EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked); + +static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper) +{ + struct drm_device *dev = fb_helper->dev; + struct drm_crtc *crtc; + int bound = 0, crtcs_bound = 0; + + /* + * Sometimes user space wants everything disabled, so don't steal the + * display if there's a master. + */ + if (READ_ONCE(dev->master)) + return false; + + drm_for_each_crtc(crtc, dev) { + drm_modeset_lock(&crtc->mutex, NULL); + if (crtc->primary->fb) + crtcs_bound++; + if (crtc->primary->fb == fb_helper->fb) + bound++; + drm_modeset_unlock(&crtc->mutex); + } + + if (bound < crtcs_bound) + return false; + + return true; +} + +#ifdef CONFIG_MAGIC_SYSRQ +/* + * restore fbcon display for all kms driver's using this helper, used for sysrq + * and panic handling. + */ +static bool drm_fb_helper_force_kernel_mode(void) +{ + bool ret, error = false; + struct drm_fb_helper *helper; + + if (list_empty(&kernel_fb_helper_list)) + return false; + + 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); + ret = restore_fbdev_mode(helper); + if (ret) + error = true; + mutex_unlock(&helper->lock); + } + return error; +} + +static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) +{ + bool ret; + + ret = drm_fb_helper_force_kernel_mode(); + if (ret == true) + DRM_ERROR("Failed to restore crtc configuration\n"); +} +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 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 struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; +#endif + +static void dpms_legacy(struct drm_fb_helper *fb_helper, int dpms_mode) +{ + struct drm_device *dev = fb_helper->dev; + struct drm_crtc *crtc; + struct drm_connector *connector; + int i, j; + + drm_modeset_lock_all(dev); + for (i = 0; i < fb_helper->crtc_count; i++) { + crtc = fb_helper->crtc_info[i].mode_set.crtc; + + if (!crtc->enabled) + continue; + + /* Walk the connectors & encoders on this fb turning them on/off */ + drm_fb_helper_for_each_connector(fb_helper, j) { + connector = fb_helper->connector_info[j]->connector; + connector->funcs->dpms(connector, dpms_mode); + drm_object_property_set_value(&connector->base, + dev->mode_config.dpms_property, dpms_mode); + } + } + drm_modeset_unlock_all(dev); +} + +static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) +{ + struct drm_fb_helper *fb_helper = info->par; + + /* + * For each CRTC in this fb, turn the connectors on/off. + */ + mutex_lock(&fb_helper->lock); + if (!drm_fb_helper_is_bound(fb_helper)) { + mutex_unlock(&fb_helper->lock); + return; + } + + if (drm_drv_uses_atomic_modeset(fb_helper->dev)) + restore_fbdev_mode_atomic(fb_helper, dpms_mode == DRM_MODE_DPMS_ON); + else + dpms_legacy(fb_helper, 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_modeset_release(struct drm_fb_helper *helper, + struct drm_mode_set *modeset) +{ + int i; + + for (i = 0; i < modeset->num_connectors; i++) { + drm_connector_put(modeset->connectors[i]); + modeset->connectors[i] = NULL; + } + modeset->num_connectors = 0; + + drm_mode_destroy(helper->dev, modeset->mode); + modeset->mode = NULL; + + /* FIXME should hold a ref? */ + modeset->fb = NULL; +} + +static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) +{ + int i; + + for (i = 0; i < helper->connector_count; i++) { + drm_connector_put(helper->connector_info[i]->connector); + kfree(helper->connector_info[i]); + } + kfree(helper->connector_info); + + for (i = 0; i < helper->crtc_count; i++) { + struct drm_mode_set *modeset = &helper->crtc_info[i].mode_set; + + drm_fb_helper_modeset_release(helper, modeset); + kfree(modeset->connectors); + } + kfree(helper->crtc_info); +} + +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_dirty_blit_real(struct drm_fb_helper *fb_helper, + struct drm_clip_rect *clip) +{ + struct drm_framebuffer *fb = fb_helper->fb; + unsigned int cpp = drm_format_plane_cpp(fb->format->format, 0); + size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp; + void *src = fb_helper->fbdev->screen_buffer + offset; + void *dst = fb_helper->buffer->vaddr + offset; + size_t len = (clip->x2 - clip->x1) * cpp; + unsigned int y; + + for (y = clip->y1; y < clip->y2; y++) { + memcpy(dst, src, len); + src += fb->pitches[0]; + dst += fb->pitches[0]; + } +} + +static void drm_fb_helper_dirty_work(struct work_struct *work) +{ + struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, + dirty_work); + struct drm_clip_rect *clip = &helper->dirty_clip; + struct drm_clip_rect clip_copy; + unsigned long flags; + + spin_lock_irqsave(&helper->dirty_lock, flags); + clip_copy = *clip; + clip->x1 = clip->y1 = ~0; + clip->x2 = clip->y2 = 0; + spin_unlock_irqrestore(&helper->dirty_lock, flags); + + /* call dirty callback only when it has been really touched */ + if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) { + /* Generic fbdev uses a shadow buffer */ + if (helper->buffer) + drm_fb_helper_dirty_blit_real(helper, &clip_copy); + helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); + } +} + +/** + * 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->dirty_lock); + INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker); + INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work); + helper->dirty_clip.x1 = helper->dirty_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 + * @max_conn_count: max connector count + * + * 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 max_conn_count) +{ + struct drm_crtc *crtc; + struct drm_mode_config *config = &dev->mode_config; + int i; + + if (!drm_fbdev_emulation) { + dev->fb_helper = fb_helper; + return 0; + } + + if (!max_conn_count) + return -EINVAL; + + fb_helper->crtc_info = kcalloc(config->num_crtc, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL); + if (!fb_helper->crtc_info) + return -ENOMEM; + + fb_helper->crtc_count = config->num_crtc; + fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL); + if (!fb_helper->connector_info) { + kfree(fb_helper->crtc_info); + return -ENOMEM; + } + fb_helper->connector_info_alloc_count = dev->mode_config.num_connector; + fb_helper->connector_count = 0; + + for (i = 0; i < fb_helper->crtc_count; i++) { + fb_helper->crtc_info[i].mode_set.connectors = + kcalloc(max_conn_count, + sizeof(struct drm_connector *), + GFP_KERNEL); + + if (!fb_helper->crtc_info[i].mode_set.connectors) + goto out_free; + fb_helper->crtc_info[i].mode_set.num_connectors = 0; + fb_helper->crtc_info[i].rotation = DRM_MODE_ROTATE_0; + } + + i = 0; + drm_for_each_crtc(crtc, dev) { + fb_helper->crtc_info[i].mode_set.crtc = crtc; + i++; + } + + dev->fb_helper = fb_helper; + + return 0; +out_free: + drm_fb_helper_crtc_free(fb_helper); + return -ENOMEM; +} +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; + + info->apertures = alloc_apertures(1); + if (!info->apertures) { + ret = -ENOMEM; + goto err_free_cmap; + } + + fb_helper->fbdev = info; + + 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. Must be + * called after drm_fb_helper_unlink_fbi() was called. + */ +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->dirty_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); + drm_fb_helper_crtc_free(fb_helper); + +} +EXPORT_SYMBOL(drm_fb_helper_fini); + +/** + * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer + * @fb_helper: driver-allocated fbdev helper, can be NULL + * + * A wrapper around unlink_framebuffer implemented by fbdev core + */ +void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) +{ + if (fb_helper && fb_helper->fbdev) + unlink_framebuffer(fb_helper->fbdev); +} +EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); + +static void drm_fb_helper_dirty(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->dirty_clip; + unsigned long flags; + + if (!helper->fb->funcs->dirty) + return; + + spin_lock_irqsave(&helper->dirty_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->dirty_lock, flags); + + schedule_work(&helper->dirty_work); +} + +/** + * drm_fb_helper_deferred_io() - fbdev deferred_io callback function + * @info: fb_info struct pointer + * @pagelist: list of dirty mmap framebuffer pages + * + * 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 *pagelist) +{ + unsigned long start, end, min, max; + struct page *page; + u32 y1, y2; + + min = ULONG_MAX; + max = 0; + list_for_each_entry(page, pagelist, lru) { + start = page->index << PAGE_SHIFT; + end = start + PAGE_SIZE - 1; + min = min(min, start); + max = max(max, end); + } + + if (min < max) { + y1 = min / info->fix.line_length; + y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length), + info->var.yres); + drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1); + } +} +EXPORT_SYMBOL(drm_fb_helper_deferred_io); + +/** + * drm_fb_helper_defio_init - fbdev deferred I/O initialization + * @fb_helper: driver-allocated fbdev helper + * + * This function allocates &fb_deferred_io, sets callback to + * drm_fb_helper_deferred_io(), delay to 50ms and calls fb_deferred_io_init(). + * It should be called from the &drm_fb_helper_funcs->fb_probe callback. + * drm_fb_helper_fbdev_teardown() cleans up deferred I/O. + * + * NOTE: A copy of &fb_ops is made and assigned to &info->fbops. This is done + * because fb_deferred_io_cleanup() clears &fbops->fb_mmap and would thereby + * affect other instances of that &fb_ops. + * + * Returns: + * 0 on success or a negative error code on failure. + */ +int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper) +{ + struct fb_info *info = fb_helper->fbdev; + struct fb_deferred_io *fbdefio; + struct fb_ops *fbops; + + fbdefio = kzalloc(sizeof(*fbdefio), GFP_KERNEL); + fbops = kzalloc(sizeof(*fbops), GFP_KERNEL); + if (!fbdefio || !fbops) { + kfree(fbdefio); + kfree(fbops); + return -ENOMEM; + } + + info->fbdefio = fbdefio; + fbdefio->delay = msecs_to_jiffies(50); + fbdefio->deferred_io = drm_fb_helper_deferred_io; + + *fbops = *info->fbops; + info->fbops = fbops; + + fb_deferred_io_init(info); + + return 0; +} +EXPORT_SYMBOL(drm_fb_helper_defio_init); + +/** + * 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) +{ + ssize_t ret; + + ret = fb_sys_write(info, buf, count, ppos); + if (ret > 0) + drm_fb_helper_dirty(info, 0, 0, info->var.xres, + info->var.yres); + + 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_dirty(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_dirty(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_dirty(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_dirty(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_dirty(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_dirty(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_crtc *crtc; + u16 *r, *g, *b; + int i, ret = 0; + + drm_modeset_lock_all(fb_helper->dev); + for (i = 0; i < fb_helper->crtc_count; i++) { + crtc = fb_helper->crtc_info[i].mode_set.crtc; + if (!crtc->funcs->gamma_set || !crtc->gamma_size) + return -EINVAL; + + if (cmap->start + cmap->len > crtc->gamma_size) + return -EINVAL; + + 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) + return ret; + } + 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_crtc *crtc; + u16 *r, *g, *b; + int i, ret = 0; + bool replaced; + + drm_modeset_acquire_init(&ctx, 0); + + state = drm_atomic_state_alloc(dev); + if (!state) { + ret = -ENOMEM; + goto out_ctx; + } + + state->acquire_ctx = &ctx; +retry: + for (i = 0; i < fb_helper->crtc_count; i++) { + crtc = fb_helper->crtc_info[i].mode_set.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; + } + + 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; + + for (i = 0; i < fb_helper->crtc_count; i++) { + crtc = fb_helper->crtc_info[i].mode_set.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; + int ret; + + if (oops_in_progress) + return -EBUSY; + + mutex_lock(&fb_helper->lock); + + if (!drm_fb_helper_is_bound(fb_helper)) { + ret = -EBUSY; + goto out; + } + + 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); + +out: + 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_mode_set *mode_set; + struct drm_crtc *crtc; + int ret = 0; + + mutex_lock(&fb_helper->lock); + if (!drm_fb_helper_is_bound(fb_helper)) { + 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. + */ + mode_set = &fb_helper->crtc_info[0].mode_set; + crtc = mode_set->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; + goto unlock; + default: + ret = -ENOTTY; + } + +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; + + if (in_dbg_master()) + return -EINVAL; + + if (var->pixclock != 0) { + DRM_DEBUG("fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n"); + var->pixclock = 0; + } + + /* + * 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_DEBUG("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_DEBUG("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; + + if (oops_in_progress) + return -EBUSY; + + if (var->pixclock != 0) { + DRM_ERROR("PIXEL CLOCK SET\n"); + return -EINVAL; + } + + drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper); + + return 0; +} +EXPORT_SYMBOL(drm_fb_helper_set_par); + +static void pan_set(struct drm_fb_helper *fb_helper, int x, int y) +{ + int i; + + for (i = 0; i < fb_helper->crtc_count; i++) { + struct drm_mode_set *mode_set; + + mode_set = &fb_helper->crtc_info[i].mode_set; + + mode_set->x = x; + mode_set->y = y; + } +} + +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 = restore_fbdev_mode_atomic(fb_helper, true); + 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_mode_set *modeset; + int ret = 0; + int i; + + drm_modeset_lock_all(fb_helper->dev); + for (i = 0; i < fb_helper->crtc_count; i++) { + modeset = &fb_helper->crtc_info[i].mode_set; + + 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); + + 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_fb_helper_is_bound(fb_helper)) { + mutex_unlock(&fb_helper->lock); + return -EBUSY; + } + + if (drm_drv_uses_atomic_modeset(dev)) + ret = pan_display_atomic(var, info); + else + ret = pan_display_legacy(var, info); + 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) +{ + int ret = 0; + int crtc_count = 0; + int i; + struct drm_fb_helper_surface_size sizes; + int gamma_size = 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 */ + if (preferred_bpp != sizes.surface_bpp) + sizes.surface_depth = sizes.surface_bpp = preferred_bpp; + + /* first up get a count of crtcs now in use and new min/maxes width/heights */ + drm_fb_helper_for_each_connector(fb_helper, i) { + struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i]; + struct drm_cmdline_mode *cmdline_mode; + + cmdline_mode = &fb_helper_conn->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; + } + } + + crtc_count = 0; + for (i = 0; i < fb_helper->crtc_count; i++) { + struct drm_display_mode *desired_mode; + struct drm_mode_set *mode_set; + 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 = fb_helper->crtc_info[i].desired_mode; + mode_set = &fb_helper->crtc_info[i].mode_set; + + if (!desired_mode) + continue; + + crtc_count++; + + x = fb_helper->crtc_info[i].x; + y = fb_helper->crtc_info[i].y; + + if (gamma_size == 0) + gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size; + + 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) { + 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); + } + + if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) { + DRM_INFO("Cannot find any crtc or sizes\n"); + + /* First time: disable all crtc's.. */ + if (!fb_helper->deferred_setup && !READ_ONCE(fb_helper->dev->master)) + restore_fbdev_mode(fb_helper); + return -EAGAIN; + } + + /* Handle our overallocation */ + sizes.surface_height *= drm_fbdev_overalloc; + sizes.surface_height /= 100; + + /* 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; +} + +/** + * drm_fb_helper_fill_fix - initializes fixed fbdev information + * @info: fbdev registered by the helper + * @pitch: desired pitch + * @depth: desired depth + * + * Helper to fill in the fixed fbdev information useful for a non-accelerated + * fbdev emulations. Drivers which support acceleration methods which impose + * additional constraints need to set up their own limits. + * + * Drivers should call this (or their equivalent setup code) from their + * &drm_fb_helper_funcs.fb_probe callback. + */ +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; +} +EXPORT_SYMBOL(drm_fb_helper_fill_fix); + +/** + * drm_fb_helper_fill_var - initalizes variable fbdev information + * @info: fbdev instance to set up + * @fb_helper: fb helper instance to use as template + * @fb_width: desired fb width + * @fb_height: desired fb height + * + * Sets up the variable 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_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; + + 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; +} +EXPORT_SYMBOL(drm_fb_helper_fill_var); + +static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper, + uint32_t maxX, + uint32_t maxY) +{ + struct drm_connector *connector; + int i, count = 0; + + drm_fb_helper_for_each_connector(fb_helper, i) { + connector = fb_helper->connector_info[i]->connector; + count += connector->funcs->fill_modes(connector, maxX, maxY); + } + + return count; +} + +struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height) +{ + struct drm_display_mode *mode; + + list_for_each_entry(mode, &fb_connector->connector->modes, head) { + if (mode->hdisplay > width || + mode->vdisplay > height) + continue; + if (mode->type & DRM_MODE_TYPE_PREFERRED) + return mode; + } + return NULL; +} +EXPORT_SYMBOL(drm_has_preferred_mode); + +static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector) +{ + return fb_connector->connector->cmdline_mode.specified; +} + +struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn) +{ + struct drm_cmdline_mode *cmdline_mode; + struct drm_display_mode *mode; + bool prefer_non_interlace; + + cmdline_mode = &fb_helper_conn->connector->cmdline_mode; + if (cmdline_mode->specified == false) + return NULL; + + /* attempt to find a matching mode in the list of modes + * we have gotten so far, if not add a CVT mode that conforms + */ + if (cmdline_mode->rb || cmdline_mode->margins) + goto create_mode; + + prefer_non_interlace = !cmdline_mode->interlace; +again: + list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { + /* check width/height */ + if (mode->hdisplay != cmdline_mode->xres || + mode->vdisplay != cmdline_mode->yres) + continue; + + if (cmdline_mode->refresh_specified) { + if (mode->vrefresh != cmdline_mode->refresh) + continue; + } + + if (cmdline_mode->interlace) { + if (!(mode->flags & DRM_MODE_FLAG_INTERLACE)) + continue; + } else if (prefer_non_interlace) { + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + continue; + } + return mode; + } + + if (prefer_non_interlace) { + prefer_non_interlace = false; + goto again; + } + +create_mode: + mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev, + cmdline_mode); + list_add(&mode->head, &fb_helper_conn->connector->modes); + return mode; +} +EXPORT_SYMBOL(drm_pick_cmdline_mode); + +static bool drm_connector_enabled(struct drm_connector *connector, bool strict) +{ + bool enable; + + if (connector->display_info.non_desktop) + return false; + + if (strict) + enable = connector->status == connector_status_connected; + else + enable = connector->status != connector_status_disconnected; + + return enable; +} + +static void drm_enable_connectors(struct drm_fb_helper *fb_helper, + bool *enabled) +{ + bool any_enabled = false; + struct drm_connector *connector; + int i = 0; + + drm_fb_helper_for_each_connector(fb_helper, i) { + connector = fb_helper->connector_info[i]->connector; + enabled[i] = drm_connector_enabled(connector, true); + DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id, + connector->display_info.non_desktop ? "non desktop" : enabled[i] ? "yes" : "no"); + + any_enabled |= enabled[i]; + } + + if (any_enabled) + return; + + drm_fb_helper_for_each_connector(fb_helper, i) { + connector = fb_helper->connector_info[i]->connector; + enabled[i] = drm_connector_enabled(connector, false); + } +} + +static bool drm_target_cloned(struct drm_fb_helper *fb_helper, + struct drm_display_mode **modes, + struct drm_fb_offset *offsets, + bool *enabled, int width, int height) +{ + int count, i, j; + bool can_clone = false; + struct drm_fb_helper_connector *fb_helper_conn; + struct drm_display_mode *dmt_mode, *mode; + + /* only contemplate cloning in the single crtc case */ + if (fb_helper->crtc_count > 1) + return false; + + count = 0; + drm_fb_helper_for_each_connector(fb_helper, i) { + if (enabled[i]) + count++; + } + + /* only contemplate cloning if more than one connector is enabled */ + if (count <= 1) + return false; + + /* check the command line or if nothing common pick 1024x768 */ + can_clone = true; + drm_fb_helper_for_each_connector(fb_helper, i) { + if (!enabled[i]) + continue; + fb_helper_conn = fb_helper->connector_info[i]; + modes[i] = drm_pick_cmdline_mode(fb_helper_conn); + if (!modes[i]) { + can_clone = false; + break; + } + for (j = 0; j < i; j++) { + if (!enabled[j]) + continue; + if (!drm_mode_match(modes[j], modes[i], + DRM_MODE_MATCH_TIMINGS | + DRM_MODE_MATCH_CLOCK | + DRM_MODE_MATCH_FLAGS | + DRM_MODE_MATCH_3D_FLAGS)) + can_clone = false; + } + } + + if (can_clone) { + DRM_DEBUG_KMS("can clone using command line\n"); + return true; + } + + /* try and find a 1024x768 mode on each connector */ + can_clone = true; + dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false); + + drm_fb_helper_for_each_connector(fb_helper, i) { + if (!enabled[i]) + continue; + + fb_helper_conn = fb_helper->connector_info[i]; + list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { + if (drm_mode_match(mode, dmt_mode, + DRM_MODE_MATCH_TIMINGS | + DRM_MODE_MATCH_CLOCK | + DRM_MODE_MATCH_FLAGS | + DRM_MODE_MATCH_3D_FLAGS)) + modes[i] = mode; + } + if (!modes[i]) + can_clone = false; + } + + if (can_clone) { + DRM_DEBUG_KMS("can clone using 1024x768\n"); + return true; + } + DRM_INFO("kms: can't enable cloning when we probably wanted to.\n"); + return false; +} + +static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper, + struct drm_display_mode **modes, + struct drm_fb_offset *offsets, + int idx, + int h_idx, int v_idx) +{ + struct drm_fb_helper_connector *fb_helper_conn; + int i; + int hoffset = 0, voffset = 0; + + drm_fb_helper_for_each_connector(fb_helper, i) { + fb_helper_conn = fb_helper->connector_info[i]; + if (!fb_helper_conn->connector->has_tile) + continue; + + if (!modes[i] && (h_idx || v_idx)) { + DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i, + fb_helper_conn->connector->base.id); + continue; + } + if (fb_helper_conn->connector->tile_h_loc < h_idx) + hoffset += modes[i]->hdisplay; + + if (fb_helper_conn->connector->tile_v_loc < v_idx) + voffset += modes[i]->vdisplay; + } + offsets[idx].x = hoffset; + offsets[idx].y = voffset; + DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx); + return 0; +} + +static bool drm_target_preferred(struct drm_fb_helper *fb_helper, + struct drm_display_mode **modes, + struct drm_fb_offset *offsets, + bool *enabled, int width, int height) +{ + struct drm_fb_helper_connector *fb_helper_conn; + const u64 mask = BIT_ULL(fb_helper->connector_count) - 1; + u64 conn_configured = 0; + int tile_pass = 0; + int i; + +retry: + drm_fb_helper_for_each_connector(fb_helper, i) { + fb_helper_conn = fb_helper->connector_info[i]; + + if (conn_configured & BIT_ULL(i)) + continue; + + if (enabled[i] == false) { + conn_configured |= BIT_ULL(i); + continue; + } + + /* first pass over all the untiled connectors */ + if (tile_pass == 0 && fb_helper_conn->connector->has_tile) + continue; + + if (tile_pass == 1) { + if (fb_helper_conn->connector->tile_h_loc != 0 || + fb_helper_conn->connector->tile_v_loc != 0) + continue; + + } else { + if (fb_helper_conn->connector->tile_h_loc != tile_pass - 1 && + fb_helper_conn->connector->tile_v_loc != tile_pass - 1) + /* if this tile_pass doesn't cover any of the tiles - keep going */ + continue; + + /* + * find the tile offsets for this pass - need to find + * all tiles left and above + */ + drm_get_tile_offsets(fb_helper, modes, offsets, + i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc); + } + DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n", + fb_helper_conn->connector->base.id); + + /* got for command line mode first */ + modes[i] = drm_pick_cmdline_mode(fb_helper_conn); + if (!modes[i]) { + DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n", + fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0); + modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height); + } + /* No preferred modes, pick one off the list */ + if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) { + list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head) + break; + } + DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name : + "none"); + conn_configured |= BIT_ULL(i); + } + + if ((conn_configured & mask) != mask) { + tile_pass++; + goto retry; + } + return true; +} + +static bool connector_has_possible_crtc(struct drm_connector *connector, + struct drm_crtc *crtc) +{ + struct drm_encoder *encoder; + int i; + + drm_connector_for_each_possible_encoder(connector, encoder, i) { + if (encoder->possible_crtcs & drm_crtc_mask(crtc)) + return true; + } + + return false; +} + +static int drm_pick_crtcs(struct drm_fb_helper *fb_helper, + struct drm_fb_helper_crtc **best_crtcs, + struct drm_display_mode **modes, + int n, int width, int height) +{ + int c, o; + struct drm_connector *connector; + int my_score, best_score, score; + struct drm_fb_helper_crtc **crtcs, *crtc; + struct drm_fb_helper_connector *fb_helper_conn; + + if (n == fb_helper->connector_count) + return 0; + + fb_helper_conn = fb_helper->connector_info[n]; + connector = fb_helper_conn->connector; + + best_crtcs[n] = NULL; + best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height); + if (modes[n] == NULL) + return best_score; + + crtcs = kcalloc(fb_helper->connector_count, + sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); + if (!crtcs) + return best_score; + + my_score = 1; + if (connector->status == connector_status_connected) + my_score++; + if (drm_has_cmdline_mode(fb_helper_conn)) + my_score++; + if (drm_has_preferred_mode(fb_helper_conn, width, height)) + my_score++; + + /* + * select a crtc for this connector and then attempt to configure + * remaining connectors + */ + for (c = 0; c < fb_helper->crtc_count; c++) { + crtc = &fb_helper->crtc_info[c]; + + if (!connector_has_possible_crtc(connector, + crtc->mode_set.crtc)) + continue; + + for (o = 0; o < n; o++) + if (best_crtcs[o] == crtc) + break; + + if (o < n) { + /* ignore cloning unless only a single crtc */ + if (fb_helper->crtc_count > 1) + continue; + + if (!drm_mode_equal(modes[o], modes[n])) + continue; + } + + crtcs[n] = crtc; + memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *)); + score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1, + width, height); + if (score > best_score) { + best_score = score; + memcpy(best_crtcs, crtcs, + fb_helper->connector_count * + sizeof(struct drm_fb_helper_crtc *)); + } + } + + kfree(crtcs); + return best_score; +} + +/* + * This function checks if rotation is necessary because of panel orientation + * and if it is, if it is supported. + * If rotation is necessary and supported, its gets set in fb_crtc.rotation. + * If rotation is necessary but not supported, a DRM_MODE_ROTATE_* flag gets + * or-ed into fb_helper->sw_rotations. In drm_setup_crtcs_fb() we check if only + * one bit is set and then we set fb_info.fbcon_rotate_hint to make fbcon do + * the unsupported rotation. + */ +static void drm_setup_crtc_rotation(struct drm_fb_helper *fb_helper, + struct drm_fb_helper_crtc *fb_crtc, + struct drm_connector *connector) +{ + struct drm_plane *plane = fb_crtc->mode_set.crtc->primary; + uint64_t valid_mask = 0; + int i, rotation; + + fb_crtc->rotation = DRM_MODE_ROTATE_0; + + switch (connector->display_info.panel_orientation) { + case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP: + rotation = DRM_MODE_ROTATE_180; + break; + case DRM_MODE_PANEL_ORIENTATION_LEFT_UP: + rotation = DRM_MODE_ROTATE_90; + break; + case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP: + rotation = DRM_MODE_ROTATE_270; + break; + default: + rotation = DRM_MODE_ROTATE_0; + } + + /* + * TODO: support 90 / 270 degree hardware rotation, + * depending on the hardware this may require the framebuffer + * to be in a specific tiling format. + */ + if (rotation != DRM_MODE_ROTATE_180 || !plane->rotation_property) { + fb_helper->sw_rotations |= rotation; + return; + } + + for (i = 0; i < plane->rotation_property->num_values; i++) + valid_mask |= (1ULL << plane->rotation_property->values[i]); + + if (!(rotation & valid_mask)) { + fb_helper->sw_rotations |= rotation; + return; + } + + fb_crtc->rotation = rotation; + /* Rotating in hardware, fbcon should not rotate */ + fb_helper->sw_rotations |= DRM_MODE_ROTATE_0; +} + +static void drm_setup_crtcs(struct drm_fb_helper *fb_helper, + u32 width, u32 height) +{ + struct drm_device *dev = fb_helper->dev; + struct drm_fb_helper_crtc **crtcs; + struct drm_display_mode **modes; + struct drm_fb_offset *offsets; + bool *enabled; + int i; + + DRM_DEBUG_KMS("\n"); + /* prevent concurrent modification of connector_count by hotplug */ + lockdep_assert_held(&fb_helper->lock); + + crtcs = kcalloc(fb_helper->connector_count, + sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); + modes = kcalloc(fb_helper->connector_count, + sizeof(struct drm_display_mode *), GFP_KERNEL); + offsets = kcalloc(fb_helper->connector_count, + sizeof(struct drm_fb_offset), GFP_KERNEL); + enabled = kcalloc(fb_helper->connector_count, + sizeof(bool), GFP_KERNEL); + if (!crtcs || !modes || !enabled || !offsets) { + DRM_ERROR("Memory allocation failed\n"); + goto out; + } + + mutex_lock(&fb_helper->dev->mode_config.mutex); + if (drm_fb_helper_probe_connector_modes(fb_helper, width, height) == 0) + DRM_DEBUG_KMS("No connectors reported connected with modes\n"); + drm_enable_connectors(fb_helper, enabled); + + if (!(fb_helper->funcs->initial_config && + fb_helper->funcs->initial_config(fb_helper, crtcs, modes, + offsets, + enabled, width, height))) { + memset(modes, 0, fb_helper->connector_count*sizeof(modes[0])); + memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0])); + memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0])); + + if (!drm_target_cloned(fb_helper, modes, offsets, + enabled, width, height) && + !drm_target_preferred(fb_helper, modes, offsets, + enabled, width, height)) + DRM_ERROR("Unable to find initial modes\n"); + + DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", + width, height); + + drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height); + } + mutex_unlock(&fb_helper->dev->mode_config.mutex); + + /* need to set the modesets up here for use later */ + /* fill out the connector<->crtc mappings into the modesets */ + for (i = 0; i < fb_helper->crtc_count; i++) + drm_fb_helper_modeset_release(fb_helper, + &fb_helper->crtc_info[i].mode_set); + + fb_helper->sw_rotations = 0; + drm_fb_helper_for_each_connector(fb_helper, i) { + struct drm_display_mode *mode = modes[i]; + struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; + struct drm_fb_offset *offset = &offsets[i]; + + if (mode && fb_crtc) { + struct drm_mode_set *modeset = &fb_crtc->mode_set; + struct drm_connector *connector = + fb_helper->connector_info[i]->connector; + + DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n", + mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y); + + fb_crtc->desired_mode = mode; + fb_crtc->x = offset->x; + fb_crtc->y = offset->y; + modeset->mode = drm_mode_duplicate(dev, + fb_crtc->desired_mode); + drm_connector_get(connector); + drm_setup_crtc_rotation(fb_helper, fb_crtc, connector); + modeset->connectors[modeset->num_connectors++] = connector; + modeset->x = offset->x; + modeset->y = offset->y; + } + } +out: + kfree(crtcs); + kfree(modes); + kfree(offsets); + kfree(enabled); +} + +/* + * 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 fb_info *info = fb_helper->fbdev; + int i; + + for (i = 0; i < fb_helper->crtc_count; i++) + if (fb_helper->crtc_info[i].mode_set.num_connectors) + fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb; + + mutex_lock(&fb_helper->dev->mode_config.mutex); + drm_fb_helper_for_each_connector(fb_helper, i) { + struct drm_connector *connector = + fb_helper->connector_info[i]->connector; + + /* 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; + } + } + mutex_unlock(&fb_helper->dev->mode_config.mutex); + + switch (fb_helper->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_setup_crtcs(fb_helper, 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; + + /* 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; + + dev_info(dev->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_var() and + * drm_fb_helper_fill_fix() are provided as helpers 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_fb_helper_is_bound(fb_helper)) { + fb_helper->delayed_hotplug = true; + mutex_unlock(&fb_helper->lock); + return err; + } + + DRM_DEBUG_KMS("\n"); + + drm_setup_crtcs(fb_helper, 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_fbdev_setup() - Setup fbdev emulation + * @dev: DRM device + * @fb_helper: fbdev helper structure to set up + * @funcs: fbdev helper functions + * @preferred_bpp: Preferred bits per pixel for the device. + * @dev->mode_config.preferred_depth is used if this is zero. + * @max_conn_count: Maximum number of connectors. + * @dev->mode_config.num_connector is used if this is zero. + * + * This function sets up fbdev emulation and registers fbdev for access by + * userspace. If all connectors are disconnected, setup is deferred to the next + * time drm_fb_helper_hotplug_event() is called. + * The caller must to provide a &drm_fb_helper_funcs->fb_probe callback + * function. + * + * See also: drm_fb_helper_initial_config() + * + * Returns: + * Zero on success or negative error code on failure. + */ +int drm_fb_helper_fbdev_setup(struct drm_device *dev, + struct drm_fb_helper *fb_helper, + const struct drm_fb_helper_funcs *funcs, + unsigned int preferred_bpp, + unsigned int max_conn_count) +{ + int ret; + + if (!preferred_bpp) + preferred_bpp = dev->mode_config.preferred_depth; + if (!preferred_bpp) + preferred_bpp = 32; + + if (!max_conn_count) + max_conn_count = dev->mode_config.num_connector; + if (!max_conn_count) { + DRM_DEV_ERROR(dev->dev, "No connectors\n"); + return -EINVAL; + } + + drm_fb_helper_prepare(dev, fb_helper, funcs); + + ret = drm_fb_helper_init(dev, fb_helper, max_conn_count); + if (ret < 0) { + DRM_DEV_ERROR(dev->dev, "Failed to initialize fbdev helper\n"); + return ret; + } + + ret = drm_fb_helper_single_add_all_connectors(fb_helper); + if (ret < 0) { + DRM_DEV_ERROR(dev->dev, "Failed to add connectors\n"); + goto err_drm_fb_helper_fini; + } + + if (!drm_drv_uses_atomic_modeset(dev)) + drm_helper_disable_unused_functions(dev); + + ret = drm_fb_helper_initial_config(fb_helper, preferred_bpp); + if (ret < 0) { + DRM_DEV_ERROR(dev->dev, "Failed to set fbdev configuration\n"); + goto err_drm_fb_helper_fini; + } + + return 0; + +err_drm_fb_helper_fini: + drm_fb_helper_fbdev_teardown(dev); + + return ret; +} +EXPORT_SYMBOL(drm_fb_helper_fbdev_setup); + +/** + * drm_fb_helper_fbdev_teardown - Tear down fbdev emulation + * @dev: DRM device + * + * This function unregisters fbdev if not already done and cleans up the + * associated resources including the &drm_framebuffer. + * The driver is responsible for freeing the &drm_fb_helper structure which is + * stored in &drm_device->fb_helper. Do note that this pointer has been cleared + * when this function returns. + * + * In order to support device removal/unplug while file handles are still open, + * drm_fb_helper_unregister_fbi() should be called on device removal and + * drm_fb_helper_fbdev_teardown() in the &drm_driver->release callback when + * file handles are closed. + */ +void drm_fb_helper_fbdev_teardown(struct drm_device *dev) +{ + struct drm_fb_helper *fb_helper = dev->fb_helper; + struct fb_ops *fbops = NULL; + + if (!fb_helper) + return; + + /* Unregister if it hasn't been done already */ + if (fb_helper->fbdev && fb_helper->fbdev->dev) + drm_fb_helper_unregister_fbi(fb_helper); + + if (fb_helper->fbdev && fb_helper->fbdev->fbdefio) { + fb_deferred_io_cleanup(fb_helper->fbdev); + kfree(fb_helper->fbdev->fbdefio); + fbops = fb_helper->fbdev->fbops; + } + + drm_fb_helper_fini(fb_helper); + kfree(fbops); + + if (fb_helper->fb) + drm_framebuffer_remove(fb_helper->fb); +} +EXPORT_SYMBOL(drm_fb_helper_fbdev_teardown); + +/** + * 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; + struct fb_ops *fbops = NULL; + void *shadow = NULL; + + if (!fb_helper->dev) + return; + + if (fbi && fbi->fbdefio) { + fb_deferred_io_cleanup(fbi); + shadow = fbi->screen_buffer; + fbops = fbi->fbops; + } + + drm_fb_helper_fini(fb_helper); + + if (shadow) { + vfree(shadow); + kfree(fbops); + } + + drm_client_framebuffer_delete(fb_helper->buffer); +} + +static void drm_fbdev_release(struct drm_fb_helper *fb_helper) +{ + drm_fbdev_cleanup(fb_helper); + + /* + * FIXME: + * Remove conditional when all CMA drivers have been moved over to using + * drm_fbdev_generic_setup(). + */ + if (fb_helper->client.funcs) { + 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 (fb_helper->dev->driver->gem_prime_mmap) + return fb_helper->dev->driver->gem_prime_mmap(fb_helper->buffer->gem, vma); + else + return -ENODEV; +} + +static 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_fb_helper_sys_read, + .fb_write = drm_fb_helper_sys_write, + .fb_fillrect = drm_fb_helper_sys_fillrect, + .fb_copyarea = drm_fb_helper_sys_copyarea, + .fb_imageblit = drm_fb_helper_sys_imageblit, +}; + +static struct fb_deferred_io drm_fbdev_defio = { + .delay = HZ / 20, + .deferred_io = drm_fb_helper_deferred_io, +}; + +/** + * drm_fb_helper_generic_probe - Generic fbdev emulation probe helper + * @fb_helper: fbdev helper structure + * @sizes: describes fbdev size and scanout surface size + * + * This function uses the client API to crate 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. + * + * Returns: + * Zero on success or negative error code on failure. + */ +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_client_buffer *buffer; + struct drm_framebuffer *fb; + struct fb_info *fbi; + u32 format; + + DRM_DEBUG_KMS("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->par = fb_helper; + fbi->fbops = &drm_fbdev_fb_ops; + fbi->screen_size = fb->height * fb->pitches[0]; + fbi->fix.smem_len = fbi->screen_size; + fbi->screen_buffer = buffer->vaddr; + /* Shamelessly leak the physical address to user-space */ +#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM) + if (drm_leak_fbdev_smem && fbi->fix.smem_start == 0) + fbi->fix.smem_start = + page_to_phys(virt_to_page(fbi->screen_buffer)); +#endif + strcpy(fbi->fix.id, "DRM emulated"); + + drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth); + drm_fb_helper_fill_var(fbi, fb_helper, sizes->fb_width, sizes->fb_height); + + if (fb->funcs->dirty) { + struct fb_ops *fbops; + void *shadow; + + /* + * fb_deferred_io_cleanup() clears &fbops->fb_mmap so a per + * instance version is necessary. + */ + fbops = kzalloc(sizeof(*fbops), GFP_KERNEL); + shadow = vzalloc(fbi->screen_size); + if (!fbops || !shadow) { + kfree(fbops); + vfree(shadow); + return -ENOMEM; + } + + *fbops = *fbi->fbops; + fbi->fbops = fbops; + fbi->screen_buffer = shadow; + fbi->fbdefio = &drm_fbdev_defio; + + fb_deferred_io_init(fbi); + } + + return 0; +} +EXPORT_SYMBOL(drm_fb_helper_generic_probe); + +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) + return 0; + + drm_fb_helper_prepare(dev, fb_helper, &drm_fb_helper_generic_funcs); + + ret = drm_fb_helper_init(dev, fb_helper, dev->mode_config.num_connector); + if (ret) + goto err; + + ret = drm_fb_helper_single_add_all_connectors(fb_helper); + if (ret) + goto err_cleanup; + + 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_DEV_ERROR(dev->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_fb_helper_generic_fbdev_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. + * + * 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. + * + * This function is safe to call even when there are no connectors present. + * Setup will be retried on the next hotplug event. + * + * Returns: + * Zero on success or negative error code on failure. + */ +int drm_fbdev_generic_setup(struct drm_device *dev, unsigned int preferred_bpp) +{ + struct drm_fb_helper *fb_helper; + int ret; + + if (!drm_fbdev_emulation) + return 0; + + fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL); + if (!fb_helper) + return -ENOMEM; + + ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs); + if (ret) { + kfree(fb_helper); + return ret; + } + + if (!preferred_bpp) + preferred_bpp = dev->mode_config.preferred_depth; + if (!preferred_bpp) + preferred_bpp = 32; + fb_helper->preferred_bpp = preferred_bpp; + + drm_fbdev_client_hotplug(&fb_helper->client); + + drm_client_add(&fb_helper->client); + + return 0; +} +EXPORT_SYMBOL(drm_fbdev_generic_setup); + +/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT) + * but the module doesn't depend on any fb console symbols. At least + * attempt to load fbcon to avoid leaving the system without a usable console. + */ +int __init drm_fb_helper_modinit(void) +{ +#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) + const char name[] = "fbcon"; + struct module *fbcon; + + mutex_lock(&module_mutex); + fbcon = find_module(name); + mutex_unlock(&module_mutex); + + if (!fbcon) + request_module_nowait(name); +#endif + return 0; +} +EXPORT_SYMBOL(drm_fb_helper_modinit); -- cgit v1.2.3