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SubjectRe: [PM] save/restore screen support for ACPI S3 sleep

> This way console should be correctly restored after S3...
>
> [Prototype should be added to include/linux/suspend.h].
>
> kernel/suspend.c part only moves code out of "SWSUSP_ONLY"
> section.

I moved this code to kernel/power/console.c and made it dependent on
CONFIG_PM only. I also fixed up the breakage Andrew reported earlier and
added prototypes to include/linux/suspend.h. Patch below for review (not
directly applicable, as it's relative to the series).

-pat

ChangeSet 1.1518, 2003/08/04 17:35:30-07:00, mochel@osdl.org

[power] Divorce suspend console code from swsusp.

- Create kernel/power/console.c
- Rename prepare_suspend_console() to pm_prepare_console() and
restore_console() to pm_restore_console().
- Add prototypes to include/linux/suspend.h.
- Make kernel/power/console.o dependent only on CONFIG_PM
- Simplify logic for SUSPEND_CONSOLE define
- Make software_resume() prepare console much earlier, so we can localize
the loglevel variables in console.c.
- Remove #ifdef CONFIG_VT from console.c, and just check for SUSPEND_CONSOLE.
(Perhaps we should make entire file dependent on CONFIG_VT_CONSOLE?)
- Add kernel/power/power.h to share things across local files.


include/linux/suspend.h | 4 +++
kernel/power/Makefile | 2 -
kernel/power/console.c | 40 ++++++++++++++++++++++++++++++
kernel/power/power.h | 9 ++++++
kernel/power/swsusp.c | 62 ++++++------------------------------------------
5 files changed, 62 insertions(+), 55 deletions(-)

diff -Nru a/include/linux/suspend.h b/include/linux/suspend.h
--- a/include/linux/suspend.h Mon Aug 4 17:44:57 2003
+++ b/include/linux/suspend.h Mon Aug 4 17:44:57 2003
@@ -85,6 +85,10 @@
extern void refrigerator(unsigned long);
extern int freeze_processes(void);
extern void thaw_processes(void);
+
+extern int pm_prepare_console(void);
+extern void pm_restore_console(void);
+
#else
static inline void refrigerator(unsigned long)
{
diff -Nru a/kernel/power/Makefile b/kernel/power/Makefile
--- a/kernel/power/Makefile Mon Aug 4 17:44:57 2003
+++ b/kernel/power/Makefile Mon Aug 4 17:44:57 2003
@@ -1,2 +1,2 @@
-obj-y := process.o
+obj-y := process.o console.o
obj-$(CONFIG_SOFTWARE_SUSPEND) += swsusp.o
diff -Nru a/kernel/power/console.c b/kernel/power/console.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/kernel/power/console.c Mon Aug 4 17:44:57 2003
@@ -0,0 +1,40 @@
+#include <linux/vt_kern.h>
+#include <linux/kbd_kern.h>
+#include "power.h"
+
+static int new_loglevel = 7;
+static int orig_loglevel;
+static int orig_fgconsole, orig_kmsg;
+
+int pm_prepare_console(void)
+{
+ orig_loglevel = console_loglevel;
+ console_loglevel = new_loglevel;
+
+#ifdef SUSPEND_CONSOLE
+ orig_fgconsole = fg_console;
+
+ if(vc_allocate(SUSPEND_CONSOLE))
+ /* we can't have a free VC for now. Too bad,
+ * we don't want to mess the screen for now. */
+ return 1;
+
+ set_console (SUSPEND_CONSOLE);
+ if(vt_waitactive(SUSPEND_CONSOLE)) {
+ pr_debug("Suspend: Can't switch VCs.");
+ return 1;
+ }
+ orig_kmsg = kmsg_redirect;
+ kmsg_redirect = SUSPEND_CONSOLE;
+#endif
+ return 0;
+}
+
+void pm_restore_console(void)
+{
+ console_loglevel = orig_loglevel;
+#ifdef SUSPEND_CONSOLE
+ set_console (orig_fgconsole);
+#endif
+ return;
+}
diff -Nru a/kernel/power/power.h b/kernel/power/power.h
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/kernel/power/power.h Mon Aug 4 17:44:57 2003
@@ -0,0 +1,9 @@
+
+
+/* With SUSPEND_CONSOLE defined, it suspend looks *really* cool, but
+ we probably do not take enough locks for switching consoles, etc,
+ so bad things might happen.
+*/
+#if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
+#define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
+#endif
diff -Nru a/kernel/power/swsusp.c b/kernel/power/swsusp.c
--- a/kernel/power/swsusp.c Mon Aug 4 17:44:57 2003
+++ b/kernel/power/swsusp.c Mon Aug 4 17:44:57 2003
@@ -43,8 +43,8 @@
#include <linux/version.h>
#include <linux/delay.h>
#include <linux/reboot.h>
-#include <linux/vt_kern.h>
#include <linux/bitops.h>
+#include <linux/vt_kern.h>
#include <linux/kbd_kern.h>
#include <linux/keyboard.h>
#include <linux/spinlock.h>
@@ -63,19 +63,12 @@
#include <asm/pgtable.h>
#include <asm/io.h>

+#include "power.h"
+
extern long sys_sync(void);

unsigned char software_suspend_enabled = 0;

-#define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
-/* With SUSPEND_CONSOLE defined, it suspend looks *really* cool, but
- we probably do not take enough locks for switching consoles, etc,
- so bad things might happen.
-*/
-#if !defined(CONFIG_VT) || !defined(CONFIG_VT_CONSOLE)
-#undef SUSPEND_CONSOLE
-#endif
-
#define __ADDRESS(x) ((unsigned long) phys_to_virt(x))
#define ADDRESS(x) __ADDRESS((x) << PAGE_SHIFT)
#define ADDRESS2(x) __ADDRESS(__pa(x)) /* Needed for x86-64 where some pages are in memory twice */
@@ -89,9 +82,6 @@
spinlock_t suspend_pagedir_lock __nosavedata = SPIN_LOCK_UNLOCKED;

/* Variables to be preserved over suspend */
-static int new_loglevel = 7;
-static int orig_loglevel;
-static int orig_fgconsole, orig_kmsg;
static int pagedir_order_check;
static int nr_copy_pages_check;

@@ -455,40 +445,6 @@
return pagedir;
}

-static int prepare_suspend_console(void)
-{
- orig_loglevel = console_loglevel;
- console_loglevel = new_loglevel;
-
-#ifdef CONFIG_VT
- orig_fgconsole = fg_console;
-#ifdef SUSPEND_CONSOLE
- if(vc_allocate(SUSPEND_CONSOLE))
- /* we can't have a free VC for now. Too bad,
- * we don't want to mess the screen for now. */
- return 1;
-
- set_console (SUSPEND_CONSOLE);
- if(vt_waitactive(SUSPEND_CONSOLE)) {
- PRINTK("Bummer. Can't switch VCs.");
- return 1;
- }
- orig_kmsg = kmsg_redirect;
- kmsg_redirect = SUSPEND_CONSOLE;
-#endif
-#endif
- return 0;
-}
-
-static void restore_console(void)
-{
- console_loglevel = orig_loglevel;
-#ifdef SUSPEND_CONSOLE
- set_console (orig_fgconsole);
-#endif
- return;
-}
-
static int prepare_suspend_processes(void)
{
sys_sync(); /* Syncing needs pdflushd, so do it before stopping processes */
@@ -743,7 +699,7 @@
static void do_software_suspend(void)
{
arch_prepare_suspend();
- if (prepare_suspend_console())
+ if (pm_prepare_console())
printk( "%sCan't allocate a console... proceeding\n", name_suspend);
if (!prepare_suspend_processes()) {

@@ -774,7 +730,7 @@
}
software_suspend_enabled = 1;
MDELAY(1000);
- restore_console();
+ pm_restore_console();
}

/*
@@ -997,8 +953,6 @@
bdev_write_page(bdev, 0, cur);
}

- if (prepare_suspend_console())
- printk("%sCan't allocate a console... proceeding\n", name_resume);
printk( "%sSignature found, resuming\n", name_resume );
MDELAY(1000);

@@ -1119,8 +1073,8 @@
}
MDELAY(1000);

- orig_loglevel = console_loglevel;
- console_loglevel = new_loglevel;
+ if (pm_prepare_console())
+ printk("swsusp: Can't allocate a console... proceeding\n");

if (!resume_file[0] && resume_status == RESUME_SPECIFIED) {
printk( "suspension device unspecified\n" );
@@ -1134,7 +1088,7 @@
panic("This never returns");

read_failure:
- console_loglevel = orig_loglevel;
+ pm_restore_console();
return;
}

-
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