> Attached is a patch against 2.4.19-pre8-ac5 fixing some bugs and typos
> in software suspend stuff. It should also make the whole process a lot
> prettier on console.
>
> Sorry if some of the corrections were already sent by Pavel.
No, I do not think I sent any corrections. Please original Florent's
patch.
Pavel
diff -u linux-src/Documentation/kernel-parameters.txt:1.1.1.2.12.1 linux-src/Documentation/kernel-parameters.txt:1.1.1.2.14.2
--- linux-src/Documentation/kernel-parameters.txt:1.1.1.2.12.1 Fri May 17 17:56:01 2002
+++ linux-src/Documentation/kernel-parameters.txt Mon May 20 12:02:54 2002
@@ -45,6 +45,7 @@
SERIAL Serial support is enabled.
SMP The kernel is an SMP kernel.
SOUND Appropriate sound system support is enabled.
+ SWSUSP Software suspension is enabled.
V4L Video For Linux support is enabled.
VGA The VGA console has been enabled.
VT Virtual terminal support is enabled.
@@ -389,6 +390,8 @@
initial RAM disk.
nointroute [IA-64]
+
+ noresume [SWSUSP] Disables resume and restore original swap space.
no-scroll [VGA]
@@ -507,6 +510,8 @@
reboot= [BUGS=ix86]
reserve= [KNL,BUGS] force the kernel to ignore some iomem area.
+
+ resume= [SWSUSP] specify the partition device for software suspension.
riscom8= [HW,SERIAL]
Applied to my 2.5-tree.
diff -u linux-src/drivers/block/loop.c:1.1.1.1.14.1.2.1 linux-src/drivers/block/loop.c:1.1.1.1.14.1.2.1.2.2
--- linux-src/drivers/block/loop.c:1.1.1.1.14.1.2.1 Mon May 6 19:26:51 2002
+++ linux-src/drivers/block/loop.c Thu May 9 14:46:35 2002
@@ -581,7 +581,9 @@
atomic_inc(&lo->lo_pending);
spin_unlock_irq(&lo->lo_lock);
- current->flags |= PF_NOIO | PF_IOTHREAD;
+ current->flags |= PF_NOIO | PF_IOTHREAD; /* loop can be used in an encrypted device
+ hence, it mustn't be stopped at all because it could
+ be indirectly used during suspension */
/*
* up sem, we are running
Applied.
Index: linux-src/drivers/usb/hub.c
diff -u linux-src/drivers/usb/hub.c:1.1.1.1.12.1.2.1 linux-src/drivers/usb/hub.c:1.1.1.1.12.1.4.2
-X-- linux-src/drivers/usb/hub.c:1.1.1.1.12.1.2.1 Sat May 11 16:52:44 2002
+X++ linux-src/drivers/usb/hub.c Sat May 11 19:28:56 2002
@@ -16,6 +16,7 @@
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
+#include <linux/suspend.h>
#ifdef CONFIG_USB_DEBUG
#define DEBUG
#else
@@ -912,6 +913,8 @@
/* Send me a signal to get me die (for debugging) */
do {
usb_hub_events();
+ if (current->flags & PF_FREEZE)
+ refrigerator(PF_IOTHREAD);
wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list));
} while (!signal_pending(current));
Applied.
Index: linux-src/include/linux/mm.h
diff -u linux-src/include/linux/mm.h:1.1.1.1.6.1.2.3 linux-src/include/linux/mm.h:1.1.1.1.6.1.2.1.2.3
-X-- linux-src/include/linux/mm.h:1.1.1.1.6.1.2.3 Thu May 23 11:31:49 2002
+X++ linux-src/include/linux/mm.h Sat May 25 16:39:22 2002
@@ -652,6 +652,9 @@
#define __GFP_IO 0x40 /* Can start low memory physical IO? */
#define __GFP_HIGHIO 0x80 /* Can start high mem physical IO? */
#define __GFP_FS 0x100 /* Can call down to low-level FS? */
+#if CONFIG_SOFTWARE_SUSPEND
+#define __GFP_FAST 0x200 /* fast return in reschedule if out of page */
+#endif
#define GFP_NOHIGHIO (__GFP_HIGH | __GFP_WAIT | __GFP_IO)
#define GFP_NOIO (__GFP_HIGH | __GFP_WAIT)
It should be #if*def*, and you better drop the ifdef too as it is
completely unneccessary.
Index: linux-src/include/linux/sched.h
diff -u linux-src/include/linux/sched.h:1.1.1.1.6.1.2.2 linux-src/include/linux/sched.h:1.1.1.1.6.1.2.1.2.2
--- linux-src/include/linux/sched.h:1.1.1.1.6.1.2.2 Thu May 23 11:31:49 2002
+++ linux-src/include/linux/sched.h Sat May 25 16:39:22 2002
@@ -428,7 +428,6 @@
#define PF_FROZEN 0x00008000 /* frozen for system suspend */
#define PF_FREEZE 0x00010000 /* this task should be frozen for suspend */
#define PF_IOTHREAD 0x00020000 /* this thread is needed for doing I/O to swap */
-#define PF_KERNTHREAD 0x00040000 /* this thread is a kernel thread that cannot be sent signals to */
#define PF_USEDFPU 0x00100000 /* task used FPU this quantum (SMP) */
Applied.
Index: linux-src/kernel/suspend.c
diff -u linux-src/kernel/suspend.c:1.3.2.2 linux-src/kernel/suspend.c:1.3.2.1.2.6
--- linux-src/kernel/suspend.c:1.3.2.2 Thu May 23 11:31:51 2002
+++ linux-src/kernel/suspend.c Sat May 25 23:10:03 2002
@@ -1,5 +1,5 @@
/*
- * linux/kernel/swsusp.c
+ * linux/kernel/suspend.c
*
* This file is to realize architecture-independent
* machine suspend feature using pretty near only high-level routines
Applied.
INTERESTING(p);
if (p->flags & PF_FROZEN)
continue;
-
+ if (p->state == TASK_STOPPED) { /* this task is a stopped but not frozen one */
+ p->flags |= PF_IOTHREAD;
+ _printk("+");
+ continue;
+ }
/* FIXME: smp problem here: we may not access other process' flags
without locking */
p->flags |= PF_FREEZE;
Are you sure this is correct? What if someone wakes it just after you
given it PF_IOTHREAD?
What's the point of all those PRINTS -> __prints changes? I do not
like additional abstractions on the top of printk(). Are they really
neccessary?
@@ -946,24 +959,27 @@
static void do_software_suspend(void)
{
arch_prepare_suspend();
- if (!prepare_suspend_console()) {
- if (!prepare_suspend_processes()) {
- free_some_memory();
-
- /* No need to invalidate any vfsmnt list -- they will be valid after resume, anyway.
- *
- * We sync here -- so you have consistent filesystem state when things go wrong.
- * -- so that noone writes to disk after we do atomic copy of data.
- */
- PRINTS( "Syncing disks before copy\n" );
- do_suspend_sync();
- drivers_suspend();
- if(drivers_suspend()==0)
- do_magic(0); /* This function returns after machine woken up from resume */
- PRINTR("Restarting processes...\n");
- thaw_processes();
- }
+ if (prepare_suspend_console())
+ __prints( "Can't allocate a console... proceeding\n");
+ if (!prepare_suspend_processes()) {
+ free_some_memory();
+
+ /* No need to invalidate any vfsmnt list -- they will be valid after resume, anyway.
+ *
+ * We sync here -- so you have consistent filesystem state when things go wrong.
+ * -- so that noone writes to disk after we do atomic copy of data.
+ */
+ PRINTS("Syncing disks before copy\n" );
+ do_suspend_sync();
+#if 0
+ schedule_timeout(1*HZ); /* Is this needed to get data properly to disk? */
+#endif
+ if(drivers_suspend()==0)
+ do_magic(0); /* This function returns after machine woken up from resume */
+ PRINTR("Restarting processes...\n");
+ thaw_processes();
}
+
software_suspend_enabled = 1;
PRINTR( "Done resume from %x\n", resume_dev );
MDELAY(1000);
Applied.
@@ -1186,9 +1202,49 @@
memcpy(cur->swh.magic.magic,"SWAPSPACE2",10);
else {
panic("%sUnable to find suspended-data signature (%.10s - misspelled?\n",
- name_resume, cur->swh.magic.magic);
+ name_resume, cur->swh.magic.magic); /* even with a noresume option, it is better
+ to panic here, because that means that the
+ resume device is not a proper swap one. It
+ is perhaps a linux or dos partition and we
+ don't want to risk damaging it. */
+ }
+ if(noresume) {
+ struct buffer_head *bh;
+ /* We don't do a sanity check here: we want to restore the swap
+ whatever version of kernel made the suspend image */
+ __printr( "%s: Fixing swap signatures...\n", resume_file);
+ /* We need to write swap, but swap is *not* enabled so
+ we must write the device directly */
+ bh = bread(resume_device, 0, PAGE_SIZE);
+ if (!bh || (!bh->b_data)) {
+ error = -EIO;
+ free_page((unsigned long)cur);
+ goto resume_read_error;
+ }
+ if (is_read_only(bh->b_dev)) {
+ __printr(KERN_WARNING "Can't write to read-only device %s\n",
+ kdevname(bh->b_dev));
+ } else {
+ memcpy(bh->b_data, cur, PAGE_SIZE);
+ generic_make_request(WRITE, bh);
+ wait_on_buffer(bh);
+ if (buffer_uptodate(bh)) {
+ error = 0;
+ brelse(bh);
+ } else {
+ __printr(KERN_WARNING "Warning %s: Fixing swap signatures unsuccessful...\n", resume_file);
+ error = -EIO;
+ bforget(bh);
+ }
+ }
+ free_page((unsigned long)cur);
+ goto resume_read_error;
}
- printk( "%sSignature found, resuming\n", name_resume );
+
+
+ if (prepare_suspend_console())
+ __printr( "Can't allocate a console... proceeding\n");
+ _printr( "Signature found, resuming\n");
MDELAY(1000);
READTO(next.val, cur);
Aiee, I guess I want this one in 2.5. version but it is not quite
trivial to port :-(.
@@ -1207,11 +1263,12 @@
pagedir_order = get_bitmask_order(nr_pgdir_pages);
error = -ENOMEM;
+ free_page((unsigned long)cur);
pagedir_nosave = (suspend_pagedir_t *)__get_free_pages(GFP_ATOMIC, pagedir_order);
if(!pagedir_nosave)
goto resume_read_error;
- PRINTR( "%sReading pagedir, ", name_resume );
+ PRINTR( "Reading pagedir\n" );
/* We get pages in reverse order of saving! */
error=-EIO;
Why freeing it? This system is going to be overwritten, anyway.
@@ -1277,7 +1334,7 @@
void software_resume(void)
{
#ifdef CONFIG_SMP
- printk(KERN_WARNING "Software Suspend has a malfunctioning SMP support. Disabled :(\n");
+ __printg(KERN_WARNING "malfunctioning SMP support. Disabled :(\n");
#else
/* We enable the possibility of machine suspend */
software_suspend_enabled = 1;
@@ -1285,10 +1342,11 @@
if(!resume_status)
return;
- printk( "%s", name_resume );
if(resume_status == NORESUME) {
- /* FIXME: Signature should be restored here */
- printk( "disabled\n" );
+ PRINTG( "resuming disabled\n" );
+ software_suspend_enabled = 0;
+ if(resume_file[0])
+ resume_try_to_read(resume_file,1);
return;
}
MDELAY(1000);
I will want this one, too...
Pavel
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