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drm_fb_helper.c
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drm_fb_helper.c
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/*
* Copyright (c) 2006-2009 Red Hat Inc.
* Copyright (c) 2006-2008 Intel Corporation
* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
*
* DRM framebuffer helper functions
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*
* Authors:
* Dave Airlie <airlied@linux.ie>
* Jesse Barnes <jesse.barnes@intel.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/console.h>
#include <linux/dma-buf.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sysrq.h>
#include <linux/vmalloc.h>
#include <drm/drm_atomic.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_print.h>
#include <drm/drm_vblank.h>
#include "drm_crtc_helper_internal.h"
#include "drm_internal.h"
static bool drm_fbdev_emulation = true;
module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
MODULE_PARM_DESC(fbdev_emulation,
"Enable legacy fbdev emulation [default=true]");
static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
module_param(drm_fbdev_overalloc, int, 0444);
MODULE_PARM_DESC(drm_fbdev_overalloc,
"Overallocation of the fbdev buffer (%) [default="
__MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
/*
* In order to keep user-space compatibility, we want in certain use-cases
* to keep leaking the fbdev physical address to the user-space program
* handling the fbdev buffer.
* This is a bad habit essentially kept into closed source opengl driver
* that should really be moved into open-source upstream projects instead
* of using legacy physical addresses in user space to communicate with
* other out-of-tree kernel modules.
*
* This module_param *should* be removed as soon as possible and be
* considered as a broken and legacy behaviour from a modern fbdev device.
*/
#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
static bool drm_leak_fbdev_smem = false;
module_param_unsafe(drm_leak_fbdev_smem, bool, 0600);
MODULE_PARM_DESC(drm_leak_fbdev_smem,
"Allow unsafe leaking fbdev physical smem address [default=false]");
#endif
static LIST_HEAD(kernel_fb_helper_list);
static DEFINE_MUTEX(kernel_fb_helper_lock);
/**
* DOC: fbdev helpers
*
* The fb helper functions are useful to provide an fbdev on top of a drm kernel
* mode setting driver. They can be used mostly independently from the crtc
* helper functions used by many drivers to implement the kernel mode setting
* interfaces.
*
* Drivers that support a dumb buffer with a virtual address and mmap support,
* should try out the generic fbdev emulation using drm_fbdev_generic_setup().
* It will automatically set up deferred I/O if the driver requires a shadow
* buffer.
*
* At runtime drivers should restore the fbdev console by using
* drm_fb_helper_lastclose() as their &drm_driver.lastclose callback.
* They should also notify the fb helper code from updates to the output
* configuration by using drm_fb_helper_output_poll_changed() as their
* &drm_mode_config_funcs.output_poll_changed callback.
*
* For suspend/resume consider using drm_mode_config_helper_suspend() and
* drm_mode_config_helper_resume() which takes care of fbdev as well.
*
* All other functions exported by the fb helper library can be used to
* implement the fbdev driver interface by the driver.
*
* It is possible, though perhaps somewhat tricky, to implement race-free
* hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
* helper must be called first to initialize the minimum required to make
* hotplug detection work. Drivers also need to make sure to properly set up
* the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
* it is safe to enable interrupts and start processing hotplug events. At the
* same time, drivers should initialize all modeset objects such as CRTCs,
* encoders and connectors. To finish up the fbdev helper initialization, the
* drm_fb_helper_init() function is called. To probe for all attached displays
* and set up an initial configuration using the detected hardware, drivers
* should call drm_fb_helper_initial_config().
*
* If &drm_framebuffer_funcs.dirty is set, the
* drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
* accumulate changes and schedule &drm_fb_helper.dirty_work to run right
* away. This worker then calls the dirty() function ensuring that it will
* always run in process context since the fb_*() function could be running in
* atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
* callback it will also schedule dirty_work with the damage collected from the
* mmap page writes.
*
* Deferred I/O is not compatible with SHMEM. Such drivers should request an
* fbdev shadow buffer and call drm_fbdev_generic_setup() instead.
*/
static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
{
uint16_t *r_base, *g_base, *b_base;
if (crtc->funcs->gamma_set == NULL)
return;
r_base = crtc->gamma_store;
g_base = r_base + crtc->gamma_size;
b_base = g_base + crtc->gamma_size;
crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
crtc->gamma_size, NULL);
}
/**
* drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
* @info: fbdev registered by the helper
*/
int drm_fb_helper_debug_enter(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
const struct drm_crtc_helper_funcs *funcs;
struct drm_mode_set *mode_set;
list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
mutex_lock(&helper->client.modeset_mutex);
drm_client_for_each_modeset(mode_set, &helper->client) {
if (!mode_set->crtc->enabled)
continue;
funcs = mode_set->crtc->helper_private;
if (funcs->mode_set_base_atomic == NULL)
continue;
if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
continue;
funcs->mode_set_base_atomic(mode_set->crtc,
mode_set->fb,
mode_set->x,
mode_set->y,
ENTER_ATOMIC_MODE_SET);
}
mutex_unlock(&helper->client.modeset_mutex);
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_debug_enter);
/**
* drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
* @info: fbdev registered by the helper
*/
int drm_fb_helper_debug_leave(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
struct drm_client_dev *client = &helper->client;
struct drm_device *dev = helper->dev;
struct drm_crtc *crtc;
const struct drm_crtc_helper_funcs *funcs;
struct drm_mode_set *mode_set;
struct drm_framebuffer *fb;
mutex_lock(&client->modeset_mutex);
drm_client_for_each_modeset(mode_set, client) {
crtc = mode_set->crtc;
if (drm_drv_uses_atomic_modeset(crtc->dev))
continue;
funcs = crtc->helper_private;
fb = crtc->primary->fb;
if (!crtc->enabled)
continue;
if (!fb) {
drm_err(dev, "no fb to restore?\n");
continue;
}
if (funcs->mode_set_base_atomic == NULL)
continue;
drm_fb_helper_restore_lut_atomic(mode_set->crtc);
funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
crtc->y, LEAVE_ATOMIC_MODE_SET);
}
mutex_unlock(&client->modeset_mutex);
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_debug_leave);
static int
__drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper,
bool force)
{
bool do_delayed;
int ret;
if (!drm_fbdev_emulation || !fb_helper)
return -ENODEV;
if (READ_ONCE(fb_helper->deferred_setup))
return 0;
mutex_lock(&fb_helper->lock);
if (force) {
/*
* Yes this is the _locked version which expects the master lock
* to be held. But for forced restores we're intentionally
* racing here, see drm_fb_helper_set_par().
*/
ret = drm_client_modeset_commit_locked(&fb_helper->client);
} else {
ret = drm_client_modeset_commit(&fb_helper->client);
}
do_delayed = fb_helper->delayed_hotplug;
if (do_delayed)
fb_helper->delayed_hotplug = false;
mutex_unlock(&fb_helper->lock);
if (do_delayed)
drm_fb_helper_hotplug_event(fb_helper);
return ret;
}
/**
* drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
* @fb_helper: driver-allocated fbdev helper, can be NULL
*
* This should be called from driver's drm &drm_driver.lastclose callback
* when implementing an fbcon on top of kms using this helper. This ensures that
* the user isn't greeted with a black screen when e.g. X dies.
*
* RETURNS:
* Zero if everything went ok, negative error code otherwise.
*/
int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
{
return __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, false);
}
EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
#ifdef CONFIG_MAGIC_SYSRQ
/*
* restore fbcon display for all kms driver's using this helper, used for sysrq
* and panic handling.
*/
static bool drm_fb_helper_force_kernel_mode(void)
{
bool ret, error = false;
struct drm_fb_helper *helper;
if (list_empty(&kernel_fb_helper_list))
return false;
list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
struct drm_device *dev = helper->dev;
if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
continue;
mutex_lock(&helper->lock);
ret = drm_client_modeset_commit_locked(&helper->client);
if (ret)
error = true;
mutex_unlock(&helper->lock);
}
return error;
}
static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
{
bool ret;
ret = drm_fb_helper_force_kernel_mode();
if (ret == true)
DRM_ERROR("Failed to restore crtc configuration\n");
}
static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
static void drm_fb_helper_sysrq(int dummy1)
{
schedule_work(&drm_fb_helper_restore_work);
}
static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
.handler = drm_fb_helper_sysrq,
.help_msg = "force-fb(V)",
.action_msg = "Restore framebuffer console",
};
#else
static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
#endif
static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
{
struct drm_fb_helper *fb_helper = info->par;
mutex_lock(&fb_helper->lock);
drm_client_modeset_dpms(&fb_helper->client, dpms_mode);
mutex_unlock(&fb_helper->lock);
}
/**
* drm_fb_helper_blank - implementation for &fb_ops.fb_blank
* @blank: desired blanking state
* @info: fbdev registered by the helper
*/
int drm_fb_helper_blank(int blank, struct fb_info *info)
{
if (oops_in_progress)
return -EBUSY;
switch (blank) {
/* Display: On; HSync: On, VSync: On */
case FB_BLANK_UNBLANK:
drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
break;
/* Display: Off; HSync: On, VSync: On */
case FB_BLANK_NORMAL:
drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
break;
/* Display: Off; HSync: Off, VSync: On */
case FB_BLANK_HSYNC_SUSPEND:
drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
break;
/* Display: Off; HSync: On, VSync: Off */
case FB_BLANK_VSYNC_SUSPEND:
drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
break;
/* Display: Off; HSync: Off, VSync: Off */
case FB_BLANK_POWERDOWN:
drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
break;
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_blank);
static void drm_fb_helper_resume_worker(struct work_struct *work)
{
struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
resume_work);
console_lock();
fb_set_suspend(helper->fbdev, 0);
console_unlock();
}
static void drm_fb_helper_dirty_blit_real(struct drm_fb_helper *fb_helper,
struct drm_clip_rect *clip)
{
struct drm_framebuffer *fb = fb_helper->fb;
unsigned int cpp = fb->format->cpp[0];
size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp;
void *src = fb_helper->fbdev->screen_buffer + offset;
void *dst = fb_helper->buffer->vaddr + offset;
size_t len = (clip->x2 - clip->x1) * cpp;
unsigned int y;
for (y = clip->y1; y < clip->y2; y++) {
if (!fb_helper->dev->mode_config.fbdev_use_iomem)
memcpy(dst, src, len);
else
memcpy_toio((void __iomem *)dst, src, len);
src += fb->pitches[0];
dst += fb->pitches[0];
}
}
static void drm_fb_helper_dirty_work(struct work_struct *work)
{
struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
dirty_work);
struct drm_clip_rect *clip = &helper->dirty_clip;
struct drm_clip_rect clip_copy;
unsigned long flags;
void *vaddr;
spin_lock_irqsave(&helper->dirty_lock, flags);
clip_copy = *clip;
clip->x1 = clip->y1 = ~0;
clip->x2 = clip->y2 = 0;
spin_unlock_irqrestore(&helper->dirty_lock, flags);
/* call dirty callback only when it has been really touched */
if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) {
/* Generic fbdev uses a shadow buffer */
if (helper->buffer) {
vaddr = drm_client_buffer_vmap(helper->buffer);
if (IS_ERR(vaddr))
return;
drm_fb_helper_dirty_blit_real(helper, &clip_copy);
}
if (helper->fb->funcs->dirty)
helper->fb->funcs->dirty(helper->fb, NULL, 0, 0,
&clip_copy, 1);
if (helper->buffer)
drm_client_buffer_vunmap(helper->buffer);
}
}
/**
* drm_fb_helper_prepare - setup a drm_fb_helper structure
* @dev: DRM device
* @helper: driver-allocated fbdev helper structure to set up
* @funcs: pointer to structure of functions associate with this helper
*
* Sets up the bare minimum to make the framebuffer helper usable. This is
* useful to implement race-free initialization of the polling helpers.
*/
void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
const struct drm_fb_helper_funcs *funcs)
{
INIT_LIST_HEAD(&helper->kernel_fb_list);
spin_lock_init(&helper->dirty_lock);
INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
mutex_init(&helper->lock);
helper->funcs = funcs;
helper->dev = dev;
}
EXPORT_SYMBOL(drm_fb_helper_prepare);
/**
* drm_fb_helper_init - initialize a &struct drm_fb_helper
* @dev: drm device
* @fb_helper: driver-allocated fbdev helper structure to initialize
*
* This allocates the structures for the fbdev helper with the given limits.
* Note that this won't yet touch the hardware (through the driver interfaces)
* nor register the fbdev. This is only done in drm_fb_helper_initial_config()
* to allow driver writes more control over the exact init sequence.
*
* Drivers must call drm_fb_helper_prepare() before calling this function.
*
* RETURNS:
* Zero if everything went ok, nonzero otherwise.
*/
int drm_fb_helper_init(struct drm_device *dev,
struct drm_fb_helper *fb_helper)
{
int ret;
if (!drm_fbdev_emulation) {
dev->fb_helper = fb_helper;
return 0;
}
/*
* If this is not the generic fbdev client, initialize a drm_client
* without callbacks so we can use the modesets.
*/
if (!fb_helper->client.funcs) {
ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL);
if (ret)
return ret;
}
dev->fb_helper = fb_helper;
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_init);
/**
* drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
* @fb_helper: driver-allocated fbdev helper
*
* A helper to alloc fb_info and the members cmap and apertures. Called
* by the driver within the fb_probe fb_helper callback function. Drivers do not
* need to release the allocated fb_info structure themselves, this is
* automatically done when calling drm_fb_helper_fini().
*
* RETURNS:
* fb_info pointer if things went okay, pointer containing error code
* otherwise
*/
struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
{
struct device *dev = fb_helper->dev->dev;
struct fb_info *info;
int ret;
info = framebuffer_alloc(0, dev);
if (!info)
return ERR_PTR(-ENOMEM);
ret = fb_alloc_cmap(&info->cmap, 256, 0);
if (ret)
goto err_release;
/*
* TODO: We really should be smarter here and alloc an apperture
* for each IORESOURCE_MEM resource helper->dev->dev has and also
* init the ranges of the appertures based on the resources.
* Note some drivers currently count on there being only 1 empty
* aperture and fill this themselves, these will need to be dealt
* with somehow when fixing this.
*/
info->apertures = alloc_apertures(1);
if (!info->apertures) {
ret = -ENOMEM;
goto err_free_cmap;
}
fb_helper->fbdev = info;
info->skip_vt_switch = true;
return info;
err_free_cmap:
fb_dealloc_cmap(&info->cmap);
err_release:
framebuffer_release(info);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
/**
* drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
* @fb_helper: driver-allocated fbdev helper, can be NULL
*
* A wrapper around unregister_framebuffer, to release the fb_info
* framebuffer device. This must be called before releasing all resources for
* @fb_helper by calling drm_fb_helper_fini().
*/
void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
{
if (fb_helper && fb_helper->fbdev)
unregister_framebuffer(fb_helper->fbdev);
}
EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
/**
* drm_fb_helper_fini - finialize a &struct drm_fb_helper
* @fb_helper: driver-allocated fbdev helper, can be NULL
*
* This cleans up all remaining resources associated with @fb_helper.
*/
void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
{
struct fb_info *info;
if (!fb_helper)
return;
fb_helper->dev->fb_helper = NULL;
if (!drm_fbdev_emulation)
return;
cancel_work_sync(&fb_helper->resume_work);
cancel_work_sync(&fb_helper->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);
static bool drm_fbdev_use_shadow_fb(struct drm_fb_helper *fb_helper)
{
struct drm_device *dev = fb_helper->dev;
struct drm_framebuffer *fb = fb_helper->fb;
return dev->mode_config.prefer_shadow_fbdev ||
dev->mode_config.prefer_shadow ||
fb->funcs->dirty;
}
static void drm_fb_helper_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 (!drm_fbdev_use_shadow_fb(helper))
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_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;