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![Maxime Ripard](/assets/img/avatar_default.png)
The drm_client_panel_rotation function has been used so far to set the default rotation based on the panel orientation. However, we can have more sources of information to make that decision, starting with the command line that we will introduce later in this series. Change the name to remove the panel mention. Reviewed-by: Noralf Trønnes <noralf@tronnes.org> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> Link: https://patchwork.freedesktop.org/patch/msgid/8cb0f0d9569d41685bbf30a1538da6578cd2769b.1560783090.git-series.maxime.ripard@bootlin.com
2395 lines
68 KiB
C
2395 lines
68 KiB
C
/*
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* Copyright (c) 2006-2009 Red Hat Inc.
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* Copyright (c) 2006-2008 Intel Corporation
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* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
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*
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* DRM framebuffer helper functions
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*
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* Authors:
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* Dave Airlie <airlied@linux.ie>
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* Jesse Barnes <jesse.barnes@intel.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/console.h>
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#include <linux/dma-buf.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sysrq.h>
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#include <linux/vmalloc.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_print.h>
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#include <drm/drm_vblank.h>
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#include "drm_internal.h"
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static bool drm_fbdev_emulation = true;
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module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
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MODULE_PARM_DESC(fbdev_emulation,
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"Enable legacy fbdev emulation [default=true]");
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static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
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module_param(drm_fbdev_overalloc, int, 0444);
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MODULE_PARM_DESC(drm_fbdev_overalloc,
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"Overallocation of the fbdev buffer (%) [default="
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__MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
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/*
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* In order to keep user-space compatibility, we want in certain use-cases
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* to keep leaking the fbdev physical address to the user-space program
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* handling the fbdev buffer.
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* This is a bad habit essentially kept into closed source opengl driver
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* that should really be moved into open-source upstream projects instead
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* of using legacy physical addresses in user space to communicate with
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* other out-of-tree kernel modules.
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*
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* This module_param *should* be removed as soon as possible and be
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* considered as a broken and legacy behaviour from a modern fbdev device.
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*/
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#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
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static bool drm_leak_fbdev_smem = false;
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module_param_unsafe(drm_leak_fbdev_smem, bool, 0600);
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MODULE_PARM_DESC(drm_leak_fbdev_smem,
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"Allow unsafe leaking fbdev physical smem address [default=false]");
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#endif
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static LIST_HEAD(kernel_fb_helper_list);
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static DEFINE_MUTEX(kernel_fb_helper_lock);
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/**
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* DOC: fbdev helpers
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*
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* The fb helper functions are useful to provide an fbdev on top of a drm kernel
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* mode setting driver. They can be used mostly independently from the crtc
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* helper functions used by many drivers to implement the kernel mode setting
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* interfaces.
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*
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* Drivers that support a dumb buffer with a virtual address and mmap support,
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* should try out the generic fbdev emulation using drm_fbdev_generic_setup().
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*
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* Setup fbdev emulation by calling drm_fb_helper_fbdev_setup() and tear it
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* down by calling drm_fb_helper_fbdev_teardown().
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*
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* At runtime drivers should restore the fbdev console by using
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* drm_fb_helper_lastclose() as their &drm_driver.lastclose callback.
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* They should also notify the fb helper code from updates to the output
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* configuration by using drm_fb_helper_output_poll_changed() as their
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* &drm_mode_config_funcs.output_poll_changed callback.
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*
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* For suspend/resume consider using drm_mode_config_helper_suspend() and
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* drm_mode_config_helper_resume() which takes care of fbdev as well.
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*
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* All other functions exported by the fb helper library can be used to
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* implement the fbdev driver interface by the driver.
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*
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* It is possible, though perhaps somewhat tricky, to implement race-free
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* hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
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* helper must be called first to initialize the minimum required to make
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* hotplug detection work. Drivers also need to make sure to properly set up
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* the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
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* it is safe to enable interrupts and start processing hotplug events. At the
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* same time, drivers should initialize all modeset objects such as CRTCs,
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* encoders and connectors. To finish up the fbdev helper initialization, the
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* drm_fb_helper_init() function is called. To probe for all attached displays
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* and set up an initial configuration using the detected hardware, drivers
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* should call drm_fb_helper_initial_config().
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*
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* If &drm_framebuffer_funcs.dirty is set, the
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* drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
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* accumulate changes and schedule &drm_fb_helper.dirty_work to run right
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* away. This worker then calls the dirty() function ensuring that it will
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* always run in process context since the fb_*() function could be running in
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* atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
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* callback it will also schedule dirty_work with the damage collected from the
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* mmap page writes. Drivers can use drm_fb_helper_defio_init() to setup
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* deferred I/O (coupled with drm_fb_helper_fbdev_teardown()).
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*/
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static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
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{
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uint16_t *r_base, *g_base, *b_base;
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if (crtc->funcs->gamma_set == NULL)
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return;
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r_base = crtc->gamma_store;
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g_base = r_base + crtc->gamma_size;
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b_base = g_base + crtc->gamma_size;
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crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
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crtc->gamma_size, NULL);
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}
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/**
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* drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
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* @info: fbdev registered by the helper
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*/
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int drm_fb_helper_debug_enter(struct fb_info *info)
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{
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struct drm_fb_helper *helper = info->par;
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const struct drm_crtc_helper_funcs *funcs;
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struct drm_mode_set *mode_set;
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list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
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mutex_lock(&helper->client.modeset_mutex);
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drm_client_for_each_modeset(mode_set, &helper->client) {
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if (!mode_set->crtc->enabled)
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continue;
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funcs = mode_set->crtc->helper_private;
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if (funcs->mode_set_base_atomic == NULL)
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continue;
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if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
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continue;
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funcs->mode_set_base_atomic(mode_set->crtc,
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mode_set->fb,
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mode_set->x,
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mode_set->y,
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ENTER_ATOMIC_MODE_SET);
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}
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mutex_unlock(&helper->client.modeset_mutex);
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_fb_helper_debug_enter);
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/**
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* drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
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* @info: fbdev registered by the helper
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*/
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int drm_fb_helper_debug_leave(struct fb_info *info)
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{
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struct drm_fb_helper *helper = info->par;
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struct drm_client_dev *client = &helper->client;
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struct drm_crtc *crtc;
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const struct drm_crtc_helper_funcs *funcs;
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struct drm_mode_set *mode_set;
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struct drm_framebuffer *fb;
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mutex_lock(&client->modeset_mutex);
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drm_client_for_each_modeset(mode_set, client) {
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crtc = mode_set->crtc;
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if (drm_drv_uses_atomic_modeset(crtc->dev))
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continue;
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funcs = crtc->helper_private;
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fb = crtc->primary->fb;
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if (!crtc->enabled)
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continue;
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if (!fb) {
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DRM_ERROR("no fb to restore??\n");
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continue;
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}
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if (funcs->mode_set_base_atomic == NULL)
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continue;
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drm_fb_helper_restore_lut_atomic(mode_set->crtc);
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funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
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crtc->y, LEAVE_ATOMIC_MODE_SET);
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}
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mutex_unlock(&client->modeset_mutex);
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return 0;
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}
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EXPORT_SYMBOL(drm_fb_helper_debug_leave);
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/**
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* drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
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* @fb_helper: driver-allocated fbdev helper, can be NULL
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*
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* This should be called from driver's drm &drm_driver.lastclose callback
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* when implementing an fbcon on top of kms using this helper. This ensures that
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* the user isn't greeted with a black screen when e.g. X dies.
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*
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* RETURNS:
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* Zero if everything went ok, negative error code otherwise.
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*/
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int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
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{
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bool do_delayed;
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int ret;
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if (!drm_fbdev_emulation || !fb_helper)
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return -ENODEV;
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if (READ_ONCE(fb_helper->deferred_setup))
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return 0;
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mutex_lock(&fb_helper->lock);
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/*
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* TODO:
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* We should bail out here if there is a master by dropping _force.
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* Currently these igt tests fail if we do that:
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* - kms_fbcon_fbt@psr
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* - kms_fbcon_fbt@psr-suspend
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*
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* So first these tests need to be fixed so they drop master or don't
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* have an fd open.
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*/
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ret = drm_client_modeset_commit_force(&fb_helper->client);
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do_delayed = fb_helper->delayed_hotplug;
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if (do_delayed)
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fb_helper->delayed_hotplug = false;
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mutex_unlock(&fb_helper->lock);
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if (do_delayed)
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drm_fb_helper_hotplug_event(fb_helper);
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return ret;
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}
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EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
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#ifdef CONFIG_MAGIC_SYSRQ
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/*
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* restore fbcon display for all kms driver's using this helper, used for sysrq
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* and panic handling.
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*/
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static bool drm_fb_helper_force_kernel_mode(void)
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{
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bool ret, error = false;
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struct drm_fb_helper *helper;
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if (list_empty(&kernel_fb_helper_list))
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return false;
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list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
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struct drm_device *dev = helper->dev;
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if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
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continue;
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mutex_lock(&helper->lock);
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ret = drm_client_modeset_commit_force(&helper->client);
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if (ret)
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error = true;
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mutex_unlock(&helper->lock);
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}
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return error;
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}
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static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
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{
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bool ret;
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ret = drm_fb_helper_force_kernel_mode();
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if (ret == true)
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DRM_ERROR("Failed to restore crtc configuration\n");
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}
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static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
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static void drm_fb_helper_sysrq(int dummy1)
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{
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schedule_work(&drm_fb_helper_restore_work);
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}
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static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
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.handler = drm_fb_helper_sysrq,
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.help_msg = "force-fb(V)",
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.action_msg = "Restore framebuffer console",
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};
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#else
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static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
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#endif
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static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
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{
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struct drm_fb_helper *fb_helper = info->par;
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mutex_lock(&fb_helper->lock);
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drm_client_modeset_dpms(&fb_helper->client, dpms_mode);
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mutex_unlock(&fb_helper->lock);
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}
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/**
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* drm_fb_helper_blank - implementation for &fb_ops.fb_blank
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* @blank: desired blanking state
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* @info: fbdev registered by the helper
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*/
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int drm_fb_helper_blank(int blank, struct fb_info *info)
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{
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if (oops_in_progress)
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return -EBUSY;
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switch (blank) {
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/* Display: On; HSync: On, VSync: On */
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case FB_BLANK_UNBLANK:
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drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
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break;
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/* Display: Off; HSync: On, VSync: On */
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case FB_BLANK_NORMAL:
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drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
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break;
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/* Display: Off; HSync: Off, VSync: On */
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case FB_BLANK_HSYNC_SUSPEND:
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drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
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break;
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/* Display: Off; HSync: On, VSync: Off */
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case FB_BLANK_VSYNC_SUSPEND:
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drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
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break;
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/* Display: Off; HSync: Off, VSync: Off */
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case FB_BLANK_POWERDOWN:
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drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
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break;
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_fb_helper_blank);
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static void drm_fb_helper_resume_worker(struct work_struct *work)
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{
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struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
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resume_work);
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console_lock();
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fb_set_suspend(helper->fbdev, 0);
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console_unlock();
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}
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static void drm_fb_helper_dirty_blit_real(struct drm_fb_helper *fb_helper,
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struct drm_clip_rect *clip)
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{
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struct drm_framebuffer *fb = fb_helper->fb;
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unsigned int cpp = fb->format->cpp[0];
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size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp;
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void *src = fb_helper->fbdev->screen_buffer + offset;
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void *dst = fb_helper->buffer->vaddr + offset;
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size_t len = (clip->x2 - clip->x1) * cpp;
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unsigned int y;
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for (y = clip->y1; y < clip->y2; y++) {
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memcpy(dst, src, len);
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src += fb->pitches[0];
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dst += fb->pitches[0];
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}
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}
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static void drm_fb_helper_dirty_work(struct work_struct *work)
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{
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struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
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dirty_work);
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struct drm_clip_rect *clip = &helper->dirty_clip;
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struct drm_clip_rect clip_copy;
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unsigned long flags;
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spin_lock_irqsave(&helper->dirty_lock, flags);
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clip_copy = *clip;
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clip->x1 = clip->y1 = ~0;
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clip->x2 = clip->y2 = 0;
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spin_unlock_irqrestore(&helper->dirty_lock, flags);
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/* call dirty callback only when it has been really touched */
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if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) {
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/* Generic fbdev uses a shadow buffer */
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if (helper->buffer)
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drm_fb_helper_dirty_blit_real(helper, &clip_copy);
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helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1);
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}
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}
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/**
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* drm_fb_helper_prepare - setup a drm_fb_helper structure
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* @dev: DRM device
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* @helper: driver-allocated fbdev helper structure to set up
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* @funcs: pointer to structure of functions associate with this helper
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*
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* Sets up the bare minimum to make the framebuffer helper usable. This is
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* useful to implement race-free initialization of the polling helpers.
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*/
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void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
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const struct drm_fb_helper_funcs *funcs)
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{
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INIT_LIST_HEAD(&helper->kernel_fb_list);
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spin_lock_init(&helper->dirty_lock);
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INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
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INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
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helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
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mutex_init(&helper->lock);
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helper->funcs = funcs;
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helper->dev = dev;
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}
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EXPORT_SYMBOL(drm_fb_helper_prepare);
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/**
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* drm_fb_helper_init - initialize a &struct drm_fb_helper
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* @dev: drm device
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* @fb_helper: driver-allocated fbdev helper structure to initialize
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* @max_conn_count: max connector count (not used)
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*
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* This allocates the structures for the fbdev helper with the given limits.
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* Note that this won't yet touch the hardware (through the driver interfaces)
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* nor register the fbdev. This is only done in drm_fb_helper_initial_config()
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* 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)
|
|
{
|
|
int ret;
|
|
|
|
if (!drm_fbdev_emulation) {
|
|
dev->fb_helper = fb_helper;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If this is not the generic fbdev client, initialize a drm_client
|
|
* without callbacks so we can use the modesets.
|
|
*/
|
|
if (!fb_helper->client.funcs) {
|
|
ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
dev->fb_helper = fb_helper;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_init);
|
|
|
|
/**
|
|
* drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
|
|
* @fb_helper: driver-allocated fbdev helper
|
|
*
|
|
* A helper to alloc fb_info and the members cmap and apertures. Called
|
|
* by the driver within the fb_probe fb_helper callback function. Drivers do not
|
|
* need to release the allocated fb_info structure themselves, this is
|
|
* automatically done when calling drm_fb_helper_fini().
|
|
*
|
|
* RETURNS:
|
|
* fb_info pointer if things went okay, pointer containing error code
|
|
* otherwise
|
|
*/
|
|
struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
|
|
{
|
|
struct device *dev = fb_helper->dev->dev;
|
|
struct fb_info *info;
|
|
int ret;
|
|
|
|
info = framebuffer_alloc(0, dev);
|
|
if (!info)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = fb_alloc_cmap(&info->cmap, 256, 0);
|
|
if (ret)
|
|
goto err_release;
|
|
|
|
info->apertures = alloc_apertures(1);
|
|
if (!info->apertures) {
|
|
ret = -ENOMEM;
|
|
goto err_free_cmap;
|
|
}
|
|
|
|
fb_helper->fbdev = info;
|
|
info->skip_vt_switch = true;
|
|
|
|
return info;
|
|
|
|
err_free_cmap:
|
|
fb_dealloc_cmap(&info->cmap);
|
|
err_release:
|
|
framebuffer_release(info);
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
|
|
|
|
/**
|
|
* drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
|
|
* @fb_helper: driver-allocated fbdev helper, can be NULL
|
|
*
|
|
* A wrapper around unregister_framebuffer, to release the fb_info
|
|
* framebuffer device. This must be called before releasing all resources for
|
|
* @fb_helper by calling drm_fb_helper_fini().
|
|
*/
|
|
void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
|
|
{
|
|
if (fb_helper && fb_helper->fbdev)
|
|
unregister_framebuffer(fb_helper->fbdev);
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
|
|
|
|
/**
|
|
* drm_fb_helper_fini - finialize a &struct drm_fb_helper
|
|
* @fb_helper: driver-allocated fbdev helper, can be NULL
|
|
*
|
|
* This cleans up all remaining resources associated with @fb_helper. 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);
|
|
|
|
if (!fb_helper->client.funcs)
|
|
drm_client_release(&fb_helper->client);
|
|
}
|
|
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_mode_set *modeset;
|
|
struct drm_crtc *crtc;
|
|
u16 *r, *g, *b;
|
|
int ret = 0;
|
|
|
|
drm_modeset_lock_all(fb_helper->dev);
|
|
drm_client_for_each_modeset(modeset, &fb_helper->client) {
|
|
crtc = modeset->crtc;
|
|
if (!crtc->funcs->gamma_set || !crtc->gamma_size)
|
|
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_mode_set *modeset;
|
|
struct drm_crtc *crtc;
|
|
u16 *r, *g, *b;
|
|
bool replaced;
|
|
int ret = 0;
|
|
|
|
drm_modeset_acquire_init(&ctx, 0);
|
|
|
|
state = drm_atomic_state_alloc(dev);
|
|
if (!state) {
|
|
ret = -ENOMEM;
|
|
goto out_ctx;
|
|
}
|
|
|
|
state->acquire_ctx = &ctx;
|
|
retry:
|
|
drm_client_for_each_modeset(modeset, &fb_helper->client) {
|
|
crtc = modeset->crtc;
|
|
|
|
if (!gamma_lut)
|
|
gamma_lut = setcmap_new_gamma_lut(crtc, cmap);
|
|
if (IS_ERR(gamma_lut)) {
|
|
ret = PTR_ERR(gamma_lut);
|
|
gamma_lut = NULL;
|
|
goto out_state;
|
|
}
|
|
|
|
crtc_state = drm_atomic_get_crtc_state(state, crtc);
|
|
if (IS_ERR(crtc_state)) {
|
|
ret = PTR_ERR(crtc_state);
|
|
goto out_state;
|
|
}
|
|
|
|
replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
|
|
NULL);
|
|
replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
|
|
replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
|
|
gamma_lut);
|
|
crtc_state->color_mgmt_changed |= replaced;
|
|
}
|
|
|
|
ret = drm_atomic_commit(state);
|
|
if (ret)
|
|
goto out_state;
|
|
|
|
drm_client_for_each_modeset(modeset, &fb_helper->client) {
|
|
crtc = modeset->crtc;
|
|
|
|
r = crtc->gamma_store;
|
|
g = r + crtc->gamma_size;
|
|
b = g + crtc->gamma_size;
|
|
|
|
memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
|
|
memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
|
|
memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
|
|
}
|
|
|
|
out_state:
|
|
if (ret == -EDEADLK)
|
|
goto backoff;
|
|
|
|
drm_property_blob_put(gamma_lut);
|
|
drm_atomic_state_put(state);
|
|
out_ctx:
|
|
drm_modeset_drop_locks(&ctx);
|
|
drm_modeset_acquire_fini(&ctx);
|
|
|
|
return ret;
|
|
|
|
backoff:
|
|
drm_atomic_state_clear(state);
|
|
drm_modeset_backoff(&ctx);
|
|
goto retry;
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
|
|
* @cmap: cmap to set
|
|
* @info: fbdev registered by the helper
|
|
*/
|
|
int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_device *dev = fb_helper->dev;
|
|
int ret;
|
|
|
|
if (oops_in_progress)
|
|
return -EBUSY;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
|
|
if (!drm_master_internal_acquire(dev)) {
|
|
ret = -EBUSY;
|
|
goto unlock;
|
|
}
|
|
|
|
mutex_lock(&fb_helper->client.modeset_mutex);
|
|
if (info->fix.visual == FB_VISUAL_TRUECOLOR)
|
|
ret = setcmap_pseudo_palette(cmap, info);
|
|
else if (drm_drv_uses_atomic_modeset(fb_helper->dev))
|
|
ret = setcmap_atomic(cmap, info);
|
|
else
|
|
ret = setcmap_legacy(cmap, info);
|
|
mutex_unlock(&fb_helper->client.modeset_mutex);
|
|
|
|
drm_master_internal_release(dev);
|
|
unlock:
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_setcmap);
|
|
|
|
/**
|
|
* drm_fb_helper_ioctl - legacy ioctl implementation
|
|
* @info: fbdev registered by the helper
|
|
* @cmd: ioctl command
|
|
* @arg: ioctl argument
|
|
*
|
|
* A helper to implement the standard fbdev ioctl. Only
|
|
* FBIO_WAITFORVSYNC is implemented for now.
|
|
*/
|
|
int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_device *dev = fb_helper->dev;
|
|
struct drm_crtc *crtc;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
if (!drm_master_internal_acquire(dev)) {
|
|
ret = -EBUSY;
|
|
goto unlock;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case FBIO_WAITFORVSYNC:
|
|
/*
|
|
* Only consider the first CRTC.
|
|
*
|
|
* This ioctl is supposed to take the CRTC number as
|
|
* an argument, but in fbdev times, what that number
|
|
* was supposed to be was quite unclear, different
|
|
* drivers were passing that argument differently
|
|
* (some by reference, some by value), and most of the
|
|
* userspace applications were just hardcoding 0 as an
|
|
* argument.
|
|
*
|
|
* The first CRTC should be the integrated panel on
|
|
* most drivers, so this is the best choice we can
|
|
* make. If we're not smart enough here, one should
|
|
* just consider switch the userspace to KMS.
|
|
*/
|
|
crtc = fb_helper->client.modesets[0].crtc;
|
|
|
|
/*
|
|
* Only wait for a vblank event if the CRTC is
|
|
* enabled, otherwise just don't do anythintg,
|
|
* not even report an error.
|
|
*/
|
|
ret = drm_crtc_vblank_get(crtc);
|
|
if (!ret) {
|
|
drm_crtc_wait_one_vblank(crtc);
|
|
drm_crtc_vblank_put(crtc);
|
|
}
|
|
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
ret = -ENOTTY;
|
|
}
|
|
|
|
drm_master_internal_release(dev);
|
|
unlock:
|
|
mutex_unlock(&fb_helper->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_ioctl);
|
|
|
|
static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1,
|
|
const struct fb_var_screeninfo *var_2)
|
|
{
|
|
return var_1->bits_per_pixel == var_2->bits_per_pixel &&
|
|
var_1->grayscale == var_2->grayscale &&
|
|
var_1->red.offset == var_2->red.offset &&
|
|
var_1->red.length == var_2->red.length &&
|
|
var_1->red.msb_right == var_2->red.msb_right &&
|
|
var_1->green.offset == var_2->green.offset &&
|
|
var_1->green.length == var_2->green.length &&
|
|
var_1->green.msb_right == var_2->green.msb_right &&
|
|
var_1->blue.offset == var_2->blue.offset &&
|
|
var_1->blue.length == var_2->blue.length &&
|
|
var_1->blue.msb_right == var_2->blue.msb_right &&
|
|
var_1->transp.offset == var_2->transp.offset &&
|
|
var_1->transp.length == var_2->transp.length &&
|
|
var_1->transp.msb_right == var_2->transp.msb_right;
|
|
}
|
|
|
|
static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
|
|
u8 depth)
|
|
{
|
|
switch (depth) {
|
|
case 8:
|
|
var->red.offset = 0;
|
|
var->green.offset = 0;
|
|
var->blue.offset = 0;
|
|
var->red.length = 8; /* 8bit DAC */
|
|
var->green.length = 8;
|
|
var->blue.length = 8;
|
|
var->transp.offset = 0;
|
|
var->transp.length = 0;
|
|
break;
|
|
case 15:
|
|
var->red.offset = 10;
|
|
var->green.offset = 5;
|
|
var->blue.offset = 0;
|
|
var->red.length = 5;
|
|
var->green.length = 5;
|
|
var->blue.length = 5;
|
|
var->transp.offset = 15;
|
|
var->transp.length = 1;
|
|
break;
|
|
case 16:
|
|
var->red.offset = 11;
|
|
var->green.offset = 5;
|
|
var->blue.offset = 0;
|
|
var->red.length = 5;
|
|
var->green.length = 6;
|
|
var->blue.length = 5;
|
|
var->transp.offset = 0;
|
|
break;
|
|
case 24:
|
|
var->red.offset = 16;
|
|
var->green.offset = 8;
|
|
var->blue.offset = 0;
|
|
var->red.length = 8;
|
|
var->green.length = 8;
|
|
var->blue.length = 8;
|
|
var->transp.offset = 0;
|
|
var->transp.length = 0;
|
|
break;
|
|
case 32:
|
|
var->red.offset = 16;
|
|
var->green.offset = 8;
|
|
var->blue.offset = 0;
|
|
var->red.length = 8;
|
|
var->green.length = 8;
|
|
var->blue.length = 8;
|
|
var->transp.offset = 24;
|
|
var->transp.length = 8;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
|
|
* @var: screeninfo to check
|
|
* @info: fbdev registered by the helper
|
|
*/
|
|
int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_framebuffer *fb = fb_helper->fb;
|
|
|
|
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;
|
|
}
|
|
|
|
if ((drm_format_info_block_width(fb->format, 0) > 1) ||
|
|
(drm_format_info_block_height(fb->format, 0) > 1))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Changes struct fb_var_screeninfo are currently not pushed back
|
|
* to KMS, hence fail if different settings are requested.
|
|
*/
|
|
if (var->bits_per_pixel != fb->format->cpp[0] * 8 ||
|
|
var->xres > fb->width || var->yres > fb->height ||
|
|
var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
|
|
DRM_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);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct drm_mode_set *mode_set;
|
|
|
|
mutex_lock(&fb_helper->client.modeset_mutex);
|
|
drm_client_for_each_modeset(mode_set, &fb_helper->client) {
|
|
mode_set->x = x;
|
|
mode_set->y = y;
|
|
}
|
|
mutex_unlock(&fb_helper->client.modeset_mutex);
|
|
}
|
|
|
|
static int pan_display_atomic(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
int ret;
|
|
|
|
pan_set(fb_helper, var->xoffset, var->yoffset);
|
|
|
|
ret = drm_client_modeset_commit_force(&fb_helper->client);
|
|
if (!ret) {
|
|
info->var.xoffset = var->xoffset;
|
|
info->var.yoffset = var->yoffset;
|
|
} else
|
|
pan_set(fb_helper, info->var.xoffset, info->var.yoffset);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pan_display_legacy(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_client_dev *client = &fb_helper->client;
|
|
struct drm_mode_set *modeset;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&client->modeset_mutex);
|
|
drm_modeset_lock_all(fb_helper->dev);
|
|
drm_client_for_each_modeset(modeset, client) {
|
|
modeset->x = var->xoffset;
|
|
modeset->y = var->yoffset;
|
|
|
|
if (modeset->num_connectors) {
|
|
ret = drm_mode_set_config_internal(modeset);
|
|
if (!ret) {
|
|
info->var.xoffset = var->xoffset;
|
|
info->var.yoffset = var->yoffset;
|
|
}
|
|
}
|
|
}
|
|
drm_modeset_unlock_all(fb_helper->dev);
|
|
mutex_unlock(&client->modeset_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
|
|
* @var: updated screen information
|
|
* @info: fbdev registered by the helper
|
|
*/
|
|
int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
struct drm_fb_helper *fb_helper = info->par;
|
|
struct drm_device *dev = fb_helper->dev;
|
|
int ret;
|
|
|
|
if (oops_in_progress)
|
|
return -EBUSY;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
if (!drm_master_internal_acquire(dev)) {
|
|
ret = -EBUSY;
|
|
goto unlock;
|
|
}
|
|
|
|
if (drm_drv_uses_atomic_modeset(dev))
|
|
ret = pan_display_atomic(var, info);
|
|
else
|
|
ret = pan_display_legacy(var, info);
|
|
|
|
drm_master_internal_release(dev);
|
|
unlock:
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_pan_display);
|
|
|
|
/*
|
|
* Allocates the backing storage and sets up the fbdev info structure through
|
|
* the ->fb_probe callback.
|
|
*/
|
|
static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
|
|
int preferred_bpp)
|
|
{
|
|
struct drm_client_dev *client = &fb_helper->client;
|
|
int ret = 0;
|
|
int crtc_count = 0;
|
|
struct drm_connector_list_iter conn_iter;
|
|
struct drm_fb_helper_surface_size sizes;
|
|
struct drm_connector *connector;
|
|
struct drm_mode_set *mode_set;
|
|
int best_depth = 0;
|
|
|
|
memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
|
|
sizes.surface_depth = 24;
|
|
sizes.surface_bpp = 32;
|
|
sizes.fb_width = (u32)-1;
|
|
sizes.fb_height = (u32)-1;
|
|
|
|
/*
|
|
* If driver picks 8 or 16 by default use that for both depth/bpp
|
|
* to begin with
|
|
*/
|
|
if (preferred_bpp != sizes.surface_bpp)
|
|
sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
|
|
|
|
drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
|
|
drm_client_for_each_connector_iter(connector, &conn_iter) {
|
|
struct drm_cmdline_mode *cmdline_mode;
|
|
|
|
cmdline_mode = &connector->cmdline_mode;
|
|
|
|
if (cmdline_mode->bpp_specified) {
|
|
switch (cmdline_mode->bpp) {
|
|
case 8:
|
|
sizes.surface_depth = sizes.surface_bpp = 8;
|
|
break;
|
|
case 15:
|
|
sizes.surface_depth = 15;
|
|
sizes.surface_bpp = 16;
|
|
break;
|
|
case 16:
|
|
sizes.surface_depth = sizes.surface_bpp = 16;
|
|
break;
|
|
case 24:
|
|
sizes.surface_depth = sizes.surface_bpp = 24;
|
|
break;
|
|
case 32:
|
|
sizes.surface_depth = 24;
|
|
sizes.surface_bpp = 32;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
drm_connector_list_iter_end(&conn_iter);
|
|
|
|
/*
|
|
* If we run into a situation where, for example, the primary plane
|
|
* supports RGBA5551 (16 bpp, depth 15) but not RGB565 (16 bpp, depth
|
|
* 16) we need to scale down the depth of the sizes we request.
|
|
*/
|
|
mutex_lock(&client->modeset_mutex);
|
|
drm_client_for_each_modeset(mode_set, client) {
|
|
struct drm_crtc *crtc = mode_set->crtc;
|
|
struct drm_plane *plane = crtc->primary;
|
|
int j;
|
|
|
|
DRM_DEBUG("test CRTC %u primary plane\n", drm_crtc_index(crtc));
|
|
|
|
for (j = 0; j < plane->format_count; j++) {
|
|
const struct drm_format_info *fmt;
|
|
|
|
fmt = drm_format_info(plane->format_types[j]);
|
|
|
|
/*
|
|
* Do not consider YUV or other complicated formats
|
|
* for framebuffers. This means only legacy formats
|
|
* are supported (fmt->depth is a legacy field) but
|
|
* the framebuffer emulation can only deal with such
|
|
* formats, specifically RGB/BGA formats.
|
|
*/
|
|
if (fmt->depth == 0)
|
|
continue;
|
|
|
|
/* We found a perfect fit, great */
|
|
if (fmt->depth == sizes.surface_depth) {
|
|
best_depth = fmt->depth;
|
|
break;
|
|
}
|
|
|
|
/* Skip depths above what we're looking for */
|
|
if (fmt->depth > sizes.surface_depth)
|
|
continue;
|
|
|
|
/* Best depth found so far */
|
|
if (fmt->depth > best_depth)
|
|
best_depth = fmt->depth;
|
|
}
|
|
}
|
|
if (sizes.surface_depth != best_depth && best_depth) {
|
|
DRM_INFO("requested bpp %d, scaled depth down to %d",
|
|
sizes.surface_bpp, best_depth);
|
|
sizes.surface_depth = best_depth;
|
|
}
|
|
|
|
/* first up get a count of crtcs now in use and new min/maxes width/heights */
|
|
crtc_count = 0;
|
|
drm_client_for_each_modeset(mode_set, client) {
|
|
struct drm_display_mode *desired_mode;
|
|
int x, y, j;
|
|
/* in case of tile group, are we the last tile vert or horiz?
|
|
* If no tile group you are always the last one both vertically
|
|
* and horizontally
|
|
*/
|
|
bool lastv = true, lasth = true;
|
|
|
|
desired_mode = mode_set->mode;
|
|
|
|
if (!desired_mode)
|
|
continue;
|
|
|
|
crtc_count++;
|
|
|
|
x = mode_set->x;
|
|
y = mode_set->y;
|
|
|
|
sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
|
|
sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
|
|
|
|
for (j = 0; j < mode_set->num_connectors; j++) {
|
|
struct drm_connector *connector = mode_set->connectors[j];
|
|
|
|
if (connector->has_tile) {
|
|
lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
|
|
lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
|
|
/* cloning to multiple tiles is just crazy-talk, so: */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (lasth)
|
|
sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
|
|
if (lastv)
|
|
sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
|
|
}
|
|
mutex_unlock(&client->modeset_mutex);
|
|
|
|
if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
|
|
DRM_INFO("Cannot find any crtc or sizes\n");
|
|
|
|
/* First time: disable all crtc's.. */
|
|
if (!fb_helper->deferred_setup)
|
|
drm_client_modeset_commit(client);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* Handle our overallocation */
|
|
sizes.surface_height *= drm_fbdev_overalloc;
|
|
sizes.surface_height /= 100;
|
|
|
|
/* push down into drivers */
|
|
ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
strcpy(fb_helper->fb->comm, "[fbcon]");
|
|
return 0;
|
|
}
|
|
|
|
static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
|
|
uint32_t depth)
|
|
{
|
|
info->fix.type = FB_TYPE_PACKED_PIXELS;
|
|
info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
|
|
FB_VISUAL_TRUECOLOR;
|
|
info->fix.mmio_start = 0;
|
|
info->fix.mmio_len = 0;
|
|
info->fix.type_aux = 0;
|
|
info->fix.xpanstep = 1; /* doing it in hw */
|
|
info->fix.ypanstep = 1; /* doing it in hw */
|
|
info->fix.ywrapstep = 0;
|
|
info->fix.accel = FB_ACCEL_NONE;
|
|
|
|
info->fix.line_length = pitch;
|
|
}
|
|
|
|
static void drm_fb_helper_fill_var(struct fb_info *info,
|
|
struct drm_fb_helper *fb_helper,
|
|
uint32_t fb_width, uint32_t fb_height)
|
|
{
|
|
struct drm_framebuffer *fb = fb_helper->fb;
|
|
|
|
WARN_ON((drm_format_info_block_width(fb->format, 0) > 1) ||
|
|
(drm_format_info_block_height(fb->format, 0) > 1));
|
|
info->pseudo_palette = fb_helper->pseudo_palette;
|
|
info->var.xres_virtual = fb->width;
|
|
info->var.yres_virtual = fb->height;
|
|
info->var.bits_per_pixel = fb->format->cpp[0] * 8;
|
|
info->var.accel_flags = FB_ACCELF_TEXT;
|
|
info->var.xoffset = 0;
|
|
info->var.yoffset = 0;
|
|
info->var.activate = FB_ACTIVATE_NOW;
|
|
|
|
drm_fb_helper_fill_pixel_fmt(&info->var, fb->format->depth);
|
|
|
|
info->var.xres = fb_width;
|
|
info->var.yres = fb_height;
|
|
}
|
|
|
|
/**
|
|
* drm_fb_helper_fill_info - initializes fbdev information
|
|
* @info: fbdev instance to set up
|
|
* @fb_helper: fb helper instance to use as template
|
|
* @sizes: describes fbdev size and scanout surface size
|
|
*
|
|
* Sets up the variable and fixed fbdev metainformation from the given fb helper
|
|
* instance and the drm framebuffer allocated in &drm_fb_helper.fb.
|
|
*
|
|
* Drivers should call this (or their equivalent setup code) from their
|
|
* &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
|
|
* backing storage framebuffer.
|
|
*/
|
|
void drm_fb_helper_fill_info(struct fb_info *info,
|
|
struct drm_fb_helper *fb_helper,
|
|
struct drm_fb_helper_surface_size *sizes)
|
|
{
|
|
struct drm_framebuffer *fb = fb_helper->fb;
|
|
|
|
drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
|
|
drm_fb_helper_fill_var(info, fb_helper,
|
|
sizes->fb_width, sizes->fb_height);
|
|
|
|
info->par = fb_helper;
|
|
snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb",
|
|
fb_helper->dev->driver->name);
|
|
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_fill_info);
|
|
|
|
/*
|
|
* This is a continuation of drm_setup_crtcs() that sets up anything related
|
|
* to the framebuffer. During initialization, drm_setup_crtcs() is called before
|
|
* the framebuffer has been allocated (fb_helper->fb and fb_helper->fbdev).
|
|
* So, any setup that touches those fields needs to be done here instead of in
|
|
* drm_setup_crtcs().
|
|
*/
|
|
static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
|
|
{
|
|
struct drm_client_dev *client = &fb_helper->client;
|
|
struct drm_connector_list_iter conn_iter;
|
|
struct fb_info *info = fb_helper->fbdev;
|
|
unsigned int rotation, sw_rotations = 0;
|
|
struct drm_connector *connector;
|
|
struct drm_mode_set *modeset;
|
|
|
|
mutex_lock(&client->modeset_mutex);
|
|
drm_client_for_each_modeset(modeset, client) {
|
|
if (!modeset->num_connectors)
|
|
continue;
|
|
|
|
modeset->fb = fb_helper->fb;
|
|
|
|
if (drm_client_rotation(modeset, &rotation))
|
|
/* Rotating in hardware, fbcon should not rotate */
|
|
sw_rotations |= DRM_MODE_ROTATE_0;
|
|
else
|
|
sw_rotations |= rotation;
|
|
}
|
|
mutex_unlock(&client->modeset_mutex);
|
|
|
|
drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
|
|
drm_client_for_each_connector_iter(connector, &conn_iter) {
|
|
|
|
/* use first connected connector for the physical dimensions */
|
|
if (connector->status == connector_status_connected) {
|
|
info->var.width = connector->display_info.width_mm;
|
|
info->var.height = connector->display_info.height_mm;
|
|
break;
|
|
}
|
|
}
|
|
drm_connector_list_iter_end(&conn_iter);
|
|
|
|
switch (sw_rotations) {
|
|
case DRM_MODE_ROTATE_0:
|
|
info->fbcon_rotate_hint = FB_ROTATE_UR;
|
|
break;
|
|
case DRM_MODE_ROTATE_90:
|
|
info->fbcon_rotate_hint = FB_ROTATE_CCW;
|
|
break;
|
|
case DRM_MODE_ROTATE_180:
|
|
info->fbcon_rotate_hint = FB_ROTATE_UD;
|
|
break;
|
|
case DRM_MODE_ROTATE_270:
|
|
info->fbcon_rotate_hint = FB_ROTATE_CW;
|
|
break;
|
|
default:
|
|
/*
|
|
* Multiple bits are set / multiple rotations requested
|
|
* fbcon cannot handle separate rotation settings per
|
|
* output, so fallback to unrotated.
|
|
*/
|
|
info->fbcon_rotate_hint = FB_ROTATE_UR;
|
|
}
|
|
}
|
|
|
|
/* Note: Drops fb_helper->lock before returning. */
|
|
static int
|
|
__drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,
|
|
int bpp_sel)
|
|
{
|
|
struct drm_device *dev = fb_helper->dev;
|
|
struct fb_info *info;
|
|
unsigned int width, height;
|
|
int ret;
|
|
|
|
width = dev->mode_config.max_width;
|
|
height = dev->mode_config.max_height;
|
|
|
|
drm_client_modeset_probe(&fb_helper->client, width, height);
|
|
ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
|
|
if (ret < 0) {
|
|
if (ret == -EAGAIN) {
|
|
fb_helper->preferred_bpp = bpp_sel;
|
|
fb_helper->deferred_setup = true;
|
|
ret = 0;
|
|
}
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
return ret;
|
|
}
|
|
drm_setup_crtcs_fb(fb_helper);
|
|
|
|
fb_helper->deferred_setup = false;
|
|
|
|
info = fb_helper->fbdev;
|
|
info->var.pixclock = 0;
|
|
/* Shamelessly allow physical address leaking to userspace */
|
|
#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
|
|
if (!drm_leak_fbdev_smem)
|
|
#endif
|
|
/* don't leak any physical addresses to userspace */
|
|
info->flags |= FBINFO_HIDE_SMEM_START;
|
|
|
|
/* Need to drop locks to avoid recursive deadlock in
|
|
* register_framebuffer. This is ok because the only thing left to do is
|
|
* register the fbdev emulation instance in kernel_fb_helper_list. */
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
ret = register_framebuffer(info);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
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_info() is provided
|
|
* as a helper to setup simple default values for the fbdev info structure.
|
|
*
|
|
* HANG DEBUGGING:
|
|
*
|
|
* When you have fbcon support built-in or already loaded, this function will do
|
|
* a full modeset to setup the fbdev console. Due to locking misdesign in the
|
|
* VT/fbdev subsystem that entire modeset sequence has to be done while holding
|
|
* console_lock. Until console_unlock is called no dmesg lines will be sent out
|
|
* to consoles, not even serial console. This means when your driver crashes,
|
|
* you will see absolutely nothing else but a system stuck in this function,
|
|
* with no further output. Any kind of printk() you place within your own driver
|
|
* or in the drm core modeset code will also never show up.
|
|
*
|
|
* Standard debug practice is to run the fbcon setup without taking the
|
|
* console_lock as a hack, to be able to see backtraces and crashes on the
|
|
* serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
|
|
* cmdline option.
|
|
*
|
|
* The other option is to just disable fbdev emulation since very likely the
|
|
* first modeset from userspace will crash in the same way, and is even easier
|
|
* to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
|
|
* kernel cmdline option.
|
|
*
|
|
* RETURNS:
|
|
* Zero if everything went ok, nonzero otherwise.
|
|
*/
|
|
int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
|
|
{
|
|
int ret;
|
|
|
|
if (!drm_fbdev_emulation)
|
|
return 0;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
ret = __drm_fb_helper_initial_config_and_unlock(fb_helper, bpp_sel);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_initial_config);
|
|
|
|
/**
|
|
* drm_fb_helper_hotplug_event - respond to a hotplug notification by
|
|
* probing all the outputs attached to the fb
|
|
* @fb_helper: driver-allocated fbdev helper, can be NULL
|
|
*
|
|
* Scan the connectors attached to the fb_helper and try to put together a
|
|
* setup after notification of a change in output configuration.
|
|
*
|
|
* Called at runtime, takes the mode config locks to be able to check/change the
|
|
* modeset configuration. Must be run from process context (which usually means
|
|
* either the output polling work or a work item launched from the driver's
|
|
* hotplug interrupt).
|
|
*
|
|
* Note that drivers may call this even before calling
|
|
* drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
|
|
* for a race-free fbcon setup and will make sure that the fbdev emulation will
|
|
* not miss any hotplug events.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success and a non-zero error code otherwise.
|
|
*/
|
|
int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
|
|
{
|
|
int err = 0;
|
|
|
|
if (!drm_fbdev_emulation || !fb_helper)
|
|
return 0;
|
|
|
|
mutex_lock(&fb_helper->lock);
|
|
if (fb_helper->deferred_setup) {
|
|
err = __drm_fb_helper_initial_config_and_unlock(fb_helper,
|
|
fb_helper->preferred_bpp);
|
|
return err;
|
|
}
|
|
|
|
if (!fb_helper->fb || !drm_master_internal_acquire(fb_helper->dev)) {
|
|
fb_helper->delayed_hotplug = true;
|
|
mutex_unlock(&fb_helper->lock);
|
|
return err;
|
|
}
|
|
|
|
drm_master_internal_release(fb_helper->dev);
|
|
|
|
DRM_DEBUG_KMS("\n");
|
|
|
|
drm_client_modeset_probe(&fb_helper->client, fb_helper->fb->width, fb_helper->fb->height);
|
|
drm_setup_crtcs_fb(fb_helper);
|
|
mutex_unlock(&fb_helper->lock);
|
|
|
|
drm_fb_helper_set_par(fb_helper->fbdev);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
|
|
|
|
/**
|
|
* drm_fb_helper_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 (not used)
|
|
*
|
|
* 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.
|
|
*
|
|
* Use drm_fb_helper_fbdev_teardown() to destroy the fbdev.
|
|
*
|
|
* See also: drm_fb_helper_initial_config(), drm_fbdev_generic_setup().
|
|
*
|
|
* 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;
|
|
|
|
drm_fb_helper_prepare(dev, fb_helper, funcs);
|
|
|
|
ret = drm_fb_helper_init(dev, fb_helper, 0);
|
|
if (ret < 0) {
|
|
DRM_DEV_ERROR(dev->dev, "fbdev: Failed to initialize (ret=%d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
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, "fbdev: Failed to set configuration (ret=%d)\n", ret);
|
|
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);
|
|
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 create a framebuffer backed by a dumb buffer.
|
|
*
|
|
* The _sys_ versions are used for &fb_ops.fb_read, fb_write, fb_fillrect,
|
|
* fb_copyarea, fb_imageblit.
|
|
*
|
|
* 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->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
|
|
drm_fb_helper_fill_info(fbi, fb_helper, sizes);
|
|
|
|
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) {
|
|
DRM_DEV_DEBUG(dev->dev, "No connectors found, will not create framebuffer!\n");
|
|
return 0;
|
|
}
|
|
|
|
drm_fb_helper_prepare(dev, fb_helper, &drm_fb_helper_generic_funcs);
|
|
|
|
ret = drm_fb_helper_init(dev, fb_helper, 0);
|
|
if (ret)
|
|
goto err;
|
|
|
|
if (!drm_drv_uses_atomic_modeset(dev))
|
|
drm_helper_disable_unused_functions(dev);
|
|
|
|
ret = drm_fb_helper_initial_config(fb_helper, fb_helper->preferred_bpp);
|
|
if (ret)
|
|
goto err_cleanup;
|
|
|
|
return 0;
|
|
|
|
err_cleanup:
|
|
drm_fbdev_cleanup(fb_helper);
|
|
err:
|
|
fb_helper->dev = NULL;
|
|
fb_helper->fbdev = NULL;
|
|
|
|
DRM_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_fbdev_generic_setup() - Setup generic fbdev emulation
|
|
* @dev: DRM device
|
|
* @preferred_bpp: Preferred bits per pixel for the device.
|
|
* @dev->mode_config.preferred_depth is used if this is zero.
|
|
*
|
|
* This function sets up generic fbdev emulation for drivers that supports
|
|
* dumb buffers with a virtual address and that can be mmap'ed. If the driver
|
|
* does not support these functions, it could use drm_fb_helper_fbdev_setup().
|
|
*
|
|
* 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.
|
|
*
|
|
* The fbdev is destroyed by drm_dev_unregister().
|
|
*
|
|
* 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;
|
|
|
|
WARN(dev->fb_helper, "fb_helper is already set!\n");
|
|
|
|
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);
|
|
DRM_DEV_ERROR(dev->dev, "Failed to register client: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (!preferred_bpp)
|
|
preferred_bpp = dev->mode_config.preferred_depth;
|
|
if (!preferred_bpp)
|
|
preferred_bpp = 32;
|
|
fb_helper->preferred_bpp = preferred_bpp;
|
|
|
|
ret = drm_fbdev_client_hotplug(&fb_helper->client);
|
|
if (ret)
|
|
DRM_DEV_DEBUG(dev->dev, "client hotplug ret=%d\n", ret);
|
|
|
|
drm_client_register(&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);
|