Re: [PATCH v2 06/19] fbcon: Use delayed work for cursor

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Am 08.02.22 um 22:08 schrieb Daniel Vetter:
Allows us to delete a bunch of hand-rolled stuff. Also to simplify the
code we initialize the cursor_work completely when we allocate the
fbcon_ops structure, instead of trying to cope with console
re-initialization.

The motiviation here is that fbcon code stops using the fb_info.queue,
which helps with locking issues around cleanup and all that in a later
patch.

Also note that this allows us to ditch the hand-rolled work cleanup in
fbcon_exit - we already call fbcon_del_cursor_timer, which takes care
of everything. Plus this was racy anyway.

Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Claudio Suarez <cssk@xxxxxxxx>
Cc: Du Cheng <ducheng2@xxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
---
  drivers/video/fbdev/core/fbcon.c | 85 +++++++++++++-------------------
  drivers/video/fbdev/core/fbcon.h |  4 +-
  2 files changed, 35 insertions(+), 54 deletions(-)

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 83f0223f5333..a368ed602e2e 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -350,8 +350,8 @@ static int get_color(struct vc_data *vc, struct fb_info *info,
static void fb_flashcursor(struct work_struct *work)
  {
-	struct fb_info *info = container_of(work, struct fb_info, queue);
-	struct fbcon_ops *ops = info->fbcon_par;
+	struct fbcon_ops *ops = container_of(work, struct fbcon_ops, cursor_work.work);
+	struct fb_info *info;
  	struct vc_data *vc = NULL;
  	int c;
  	int mode;
@@ -364,7 +364,10 @@ static void fb_flashcursor(struct work_struct *work)
  	if (ret == 0)
  		return;
- if (ops && ops->currcon != -1)
+	/* protected by console_lock */
+	info = ops->info;
+
+	if (ops->currcon != -1)
  		vc = vc_cons[ops->currcon].d;
if (!vc || !con_is_visible(vc) ||
@@ -380,42 +383,25 @@ static void fb_flashcursor(struct work_struct *work)
  	ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
  		    get_color(vc, info, c, 0));
  	console_unlock();
-}
-static void cursor_timer_handler(struct timer_list *t)
-{
-	struct fbcon_ops *ops = from_timer(ops, t, cursor_timer);
-	struct fb_info *info = ops->info;
-
-	queue_work(system_power_efficient_wq, &info->queue);
-	mod_timer(&ops->cursor_timer, jiffies + ops->cur_blink_jiffies);
+	queue_delayed_work(system_power_efficient_wq, &ops->cursor_work,
+			   ops->cur_blink_jiffies);
  }
-static void fbcon_add_cursor_timer(struct fb_info *info)
+static void fbcon_add_cursor_work(struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
- if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
-	    !(ops->flags & FBCON_FLAGS_CURSOR_TIMER) &&
-	    !fbcon_cursor_noblink) {
-		if (!info->queue.func)
-			INIT_WORK(&info->queue, fb_flashcursor);
-
-		timer_setup(&ops->cursor_timer, cursor_timer_handler, 0);
-		mod_timer(&ops->cursor_timer, jiffies + ops->cur_blink_jiffies);
-		ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
-	}
+	if (!fbcon_cursor_noblink)
+		queue_delayed_work(system_power_efficient_wq, &ops->cursor_work,
+				   ops->cur_blink_jiffies);
  }
-static void fbcon_del_cursor_timer(struct fb_info *info)
+static void fbcon_del_cursor_work(struct fb_info *info)
  {
  	struct fbcon_ops *ops = info->fbcon_par;
- if (info->queue.func == fb_flashcursor &&
-	    ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
-		del_timer_sync(&ops->cursor_timer);
-		ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
-	}
+	cancel_delayed_work_sync(&ops->cursor_work);
  }
#ifndef MODULE
@@ -714,6 +700,8 @@ static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
  		ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
  		if (!ops)
  			err = -ENOMEM;
+
+		INIT_DELAYED_WORK(&ops->cursor_work, fb_flashcursor);

There's similar code in fbcon_startup() when there should be a single init function for fbcon_ops. Maybe something for later.

Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>

  	}
if (!err) {
@@ -751,7 +739,7 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
  	}
if (!err) {
-		fbcon_del_cursor_timer(oldinfo);
+		fbcon_del_cursor_work(oldinfo);
  		kfree(ops->cursor_state.mask);
  		kfree(ops->cursor_data);
  		kfree(ops->cursor_src);
@@ -867,7 +855,7 @@ static int set_con2fb_map(int unit, int newidx, int user)
  				 logo_shown != FBCON_LOGO_DONTSHOW);
if (!found)
-			fbcon_add_cursor_timer(info);
+			fbcon_add_cursor_work(info);
  		con2fb_map_boot[unit] = newidx;
  		con2fb_init_display(vc, info, unit, show_logo);
  	}
@@ -964,6 +952,8 @@ static const char *fbcon_startup(void)
  		return NULL;
  	}
+ INIT_DELAYED_WORK(&ops->cursor_work, fb_flashcursor);
+
  	ops->currcon = -1;
  	ops->graphics = 1;
  	ops->cur_rotate = -1;
@@ -1006,7 +996,7 @@ static const char *fbcon_startup(void)
  		 info->var.yres,
  		 info->var.bits_per_pixel);
- fbcon_add_cursor_timer(info);
+	fbcon_add_cursor_work(info);
  	return display_desc;
  }
@@ -1194,7 +1184,7 @@ static void fbcon_deinit(struct vc_data *vc)
  		goto finished;
if (con_is_visible(vc))
-		fbcon_del_cursor_timer(info);
+		fbcon_del_cursor_work(info);
ops->flags &= ~FBCON_FLAGS_INIT;
  finished:
@@ -1320,9 +1310,9 @@ static void fbcon_cursor(struct vc_data *vc, int mode)
  		return;
if (vc->vc_cursor_type & CUR_SW)
-		fbcon_del_cursor_timer(info);
+		fbcon_del_cursor_work(info);
  	else
-		fbcon_add_cursor_timer(info);
+		fbcon_add_cursor_work(info);
ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1; @@ -2132,14 +2122,14 @@ static int fbcon_switch(struct vc_data *vc)
  		}
if (old_info != info)
-			fbcon_del_cursor_timer(old_info);
+			fbcon_del_cursor_work(old_info);
  	}
if (fbcon_is_inactive(vc, info) ||
  	    ops->blank_state != FB_BLANK_UNBLANK)
-		fbcon_del_cursor_timer(info);
+		fbcon_del_cursor_work(info);
  	else
-		fbcon_add_cursor_timer(info);
+		fbcon_add_cursor_work(info);
set_blitting_type(vc, info);
  	ops->cursor_reset = 1;
@@ -2247,9 +2237,9 @@ static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
if (mode_switch || fbcon_is_inactive(vc, info) ||
  	    ops->blank_state != FB_BLANK_UNBLANK)
-		fbcon_del_cursor_timer(info);
+		fbcon_del_cursor_work(info);
  	else
-		fbcon_add_cursor_timer(info);
+		fbcon_add_cursor_work(info);
return 0;
  }
@@ -3181,7 +3171,7 @@ static ssize_t show_cursor_blink(struct device *device,
  	if (!ops)
  		goto err;
- blink = (ops->flags & FBCON_FLAGS_CURSOR_TIMER) ? 1 : 0;
+	blink = delayed_work_pending(&ops->cursor_work);
  err:
  	console_unlock();
  	return snprintf(buf, PAGE_SIZE, "%d\n", blink);
@@ -3210,10 +3200,10 @@ static ssize_t store_cursor_blink(struct device *device,
if (blink) {
  		fbcon_cursor_noblink = 0;
-		fbcon_add_cursor_timer(info);
+		fbcon_add_cursor_work(info);
  	} else {
  		fbcon_cursor_noblink = 1;
-		fbcon_del_cursor_timer(info);
+		fbcon_del_cursor_work(info);
  	}
err:
@@ -3314,15 +3304,9 @@ static void fbcon_exit(void)
  #endif
for_each_registered_fb(i) {
-		int pending = 0;
-
  		mapped = 0;
  		info = registered_fb[i];
- if (info->queue.func)
-			pending = cancel_work_sync(&info->queue);
-		pr_debug("fbcon: %s pending work\n", (pending ? "canceled" : "no"));
-
  		for (j = first_fb_vc; j <= last_fb_vc; j++) {
  			if (con2fb_map[j] == i) {
  				mapped = 1;
@@ -3338,15 +3322,12 @@ static void fbcon_exit(void)
  			if (info->fbcon_par) {
  				struct fbcon_ops *ops = info->fbcon_par;
- fbcon_del_cursor_timer(info);
+				fbcon_del_cursor_work(info);
  				kfree(ops->cursor_src);
  				kfree(ops->cursor_state.mask);
  				kfree(info->fbcon_par);
  				info->fbcon_par = NULL;
  			}
-
-			if (info->queue.func == fb_flashcursor)
-				info->queue.func = NULL;
  		}
  	}
  }
diff --git a/drivers/video/fbdev/core/fbcon.h b/drivers/video/fbdev/core/fbcon.h
index 969d41ecede5..6708ca0048aa 100644
--- a/drivers/video/fbdev/core/fbcon.h
+++ b/drivers/video/fbdev/core/fbcon.h
@@ -14,11 +14,11 @@
  #include <linux/types.h>
  #include <linux/vt_buffer.h>
  #include <linux/vt_kern.h>
+#include <linux/workqueue.h>
#include <asm/io.h> #define FBCON_FLAGS_INIT 1
-#define FBCON_FLAGS_CURSOR_TIMER 2
/*
      *    This is the interface between the low-level console driver and the
@@ -68,7 +68,7 @@ struct fbcon_ops {
  	int  (*update_start)(struct fb_info *info);
  	int  (*rotate_font)(struct fb_info *info, struct vc_data *vc);
  	struct fb_var_screeninfo var;  /* copy of the current fb_var_screeninfo */
-	struct timer_list cursor_timer; /* Cursor timer */
+	struct delayed_work cursor_work; /* Cursor timer */
  	struct fb_cursor cursor_state;
  	struct fbcon_display *p;
  	struct fb_info *info;

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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