WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] [PATCH v4 2/5] xen: use freeze/restore/thaw PM events for su

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] [PATCH v4 2/5] xen: use freeze/restore/thaw PM events for suspend/resume/chkpt
From: Shriram Rajagopalan <rshriram@xxxxxxxxx>
Date: Wed, 16 Mar 2011 10:19:38 -0700
Cc: rjw@xxxxxxx, Shriram Rajagopalan <rshriram@xxxxxxxxx>, konrad.wilk@xxxxxxxxxx
Delivery-date: Wed, 16 Mar 2011 10:20:50 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <1299906435-30927-1-git-send-email-rshriram@xxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <1299906435-30927-1-git-send-email-rshriram@xxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Use PM_FREEZE, PM_THAW and PM_RESTORE power events for
suspend/resume/checkpoint functionality, instead of PM_SUSPEND
and PM_RESUME. Use of these pm events fixes the Xen Guest hangup
when taking checkpoints. When a suspend event is cancelled
(while taking checkpoints once/continuously), we use PM_THAW
instead of PM_RESUME. PM_RESTORE is used when suspend is not
cancelled. See Documentation/power/devices.txt and linux/pm.h
for more info about freeze, thaw and restore. The sequence of
pm events in a suspend-resume scenario is shown below.

        dpm_suspend_start(PMSG_FREEZE);

                dpm_suspend_noirq(PMSG_FREEZE);

                       sysdev_suspend(PMSG_FREEZE);
                       cancelled = suspend_hypercall()
                       sysdev_resume();

               dpm_resume_noirq(cancelled ? PMSG_THAW : PMSG_RESTORE);

       dpm_resume_end(cancelled ? PMSG_THAW : PMSG_RESTORE);

Signed-off-by: Shriram Rajagopalan <rshriram@xxxxxxxxx>
---
 drivers/xen/manage.c                       |   16 ++++++++--------
 drivers/xen/xenbus/xenbus_probe_frontend.c |    8 +++++---
 2 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index ebb2928..95143dd 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -61,7 +61,7 @@ static void xen_post_suspend(int cancelled)
        xen_mm_unpin_all();
 }
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_HIBERNATION
 static int xen_suspend(void *data)
 {
        struct suspend_info *si = data;
@@ -69,7 +69,7 @@ static int xen_suspend(void *data)
 
        BUG_ON(!irqs_disabled());
 
-       err = sysdev_suspend(PMSG_SUSPEND);
+       err = sysdev_suspend(PMSG_FREEZE);
        if (err) {
                printk(KERN_ERR "xen_suspend: sysdev_suspend failed: %d\n",
                        err);
@@ -118,7 +118,7 @@ static void do_suspend(void)
        }
 #endif
 
-       err = dpm_suspend_start(PMSG_SUSPEND);
+       err = dpm_suspend_start(PMSG_FREEZE);
        if (err) {
                printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err);
                goto out_thaw;
@@ -127,7 +127,7 @@ static void do_suspend(void)
        printk(KERN_DEBUG "suspending xenstore...\n");
        xs_suspend();
 
-       err = dpm_suspend_noirq(PMSG_SUSPEND);
+       err = dpm_suspend_noirq(PMSG_FREEZE);
        if (err) {
                printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err);
                goto out_resume;
@@ -147,7 +147,7 @@ static void do_suspend(void)
 
        err = stop_machine(xen_suspend, &si, cpumask_of(0));
 
-       dpm_resume_noirq(PMSG_RESUME);
+       dpm_resume_noirq(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
 
        if (err) {
                printk(KERN_ERR "failed to start xen_suspend: %d\n", err);
@@ -161,7 +161,7 @@ out_resume:
        } else
                xs_suspend_cancel();
 
-       dpm_resume_end(PMSG_RESUME);
+       dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
 
        /* Make sure timer events get retriggered on all CPUs */
        clock_was_set();
@@ -173,7 +173,7 @@ out:
 #endif
        shutting_down = SHUTDOWN_INVALID;
 }
-#endif /* CONFIG_PM_SLEEP */
+#endif /* CONFIG_HIBERNATION */
 
 struct shutdown_handler {
        const char *command;
@@ -202,7 +202,7 @@ static void shutdown_handler(struct xenbus_watch *watch,
                { "poweroff",   do_poweroff },
                { "halt",       do_poweroff },
                { "reboot",     do_reboot   },
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_HIBERNATION
                { "suspend",    do_suspend  },
 #endif
                {NULL, NULL},
diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c 
b/drivers/xen/xenbus/xenbus_probe_frontend.c
index ea83999..b6a2690 100644
--- a/drivers/xen/xenbus/xenbus_probe_frontend.c
+++ b/drivers/xen/xenbus/xenbus_probe_frontend.c
@@ -86,9 +86,11 @@ static struct device_attribute xenbus_frontend_dev_attrs[] = 
{
 };
 
 static const struct dev_pm_ops xenbus_pm_ops = {
-       .suspend = xenbus_dev_suspend,
-       .resume  = xenbus_dev_resume,
-       .thaw  = xenbus_dev_cancel,
+       .suspend        = xenbus_dev_suspend,
+       .resume         = xenbus_dev_resume,
+       .freeze         = xenbus_dev_suspend,
+       .thaw           = xenbus_dev_cancel,
+       .restore        = xenbus_dev_resume,
 };
 
 static struct xen_bus_type xenbus_frontend = {
-- 
1.7.0.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel