2007-07-18 03:37:07 +02:00
|
|
|
/*
|
|
|
|
* Handle extern requests for shutdown, reboot and sysrq
|
|
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/err.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
|
|
|
#include <linux/slab.h>
|
2007-07-18 03:37:07 +02:00
|
|
|
#include <linux/reboot.h>
|
|
|
|
#include <linux/sysrq.h>
|
2008-05-27 00:31:27 +02:00
|
|
|
#include <linux/stop_machine.h>
|
|
|
|
#include <linux/freezer.h>
|
2007-07-18 03:37:07 +02:00
|
|
|
|
|
|
|
#include <xen/xenbus.h>
|
2008-05-27 00:31:27 +02:00
|
|
|
#include <xen/grant_table.h>
|
|
|
|
#include <xen/events.h>
|
|
|
|
#include <xen/hvc-console.h>
|
|
|
|
#include <xen/xen-ops.h>
|
2007-07-18 03:37:07 +02:00
|
|
|
|
2008-05-27 00:31:27 +02:00
|
|
|
#include <asm/xen/hypercall.h>
|
|
|
|
#include <asm/xen/page.h>
|
|
|
|
|
|
|
|
enum shutdown_state {
|
|
|
|
SHUTDOWN_INVALID = -1,
|
|
|
|
SHUTDOWN_POWEROFF = 0,
|
|
|
|
SHUTDOWN_SUSPEND = 2,
|
|
|
|
/* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only
|
|
|
|
report a crash, not be instructed to crash!
|
|
|
|
HALT is the same as POWEROFF, as far as we're concerned. The tools use
|
|
|
|
the distinction when we return the reason code to them. */
|
|
|
|
SHUTDOWN_HALT = 4,
|
|
|
|
};
|
2007-07-18 03:37:07 +02:00
|
|
|
|
|
|
|
/* Ignore multiple shutdown requests. */
|
2008-05-27 00:31:27 +02:00
|
|
|
static enum shutdown_state shutting_down = SHUTDOWN_INVALID;
|
|
|
|
|
2008-05-29 10:02:19 +02:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
2008-05-27 00:31:27 +02:00
|
|
|
static int xen_suspend(void *data)
|
|
|
|
{
|
|
|
|
int *cancelled = data;
|
2008-05-27 00:31:28 +02:00
|
|
|
int err;
|
2008-05-27 00:31:27 +02:00
|
|
|
|
|
|
|
BUG_ON(!irqs_disabled());
|
|
|
|
|
2009-02-22 18:38:50 +01:00
|
|
|
err = sysdev_suspend(PMSG_SUSPEND);
|
|
|
|
if (err) {
|
|
|
|
printk(KERN_ERR "xen_suspend: sysdev_suspend failed: %d\n",
|
|
|
|
err);
|
|
|
|
return err;
|
|
|
|
}
|
2008-05-27 00:31:28 +02:00
|
|
|
|
2008-05-27 00:31:27 +02:00
|
|
|
xen_mm_pin_all();
|
|
|
|
gnttab_suspend();
|
|
|
|
xen_pre_suspend();
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This hypercall returns 1 if suspend was cancelled
|
|
|
|
* or the domain was merely checkpointed, and 0 if it
|
|
|
|
* is resuming in a new domain.
|
|
|
|
*/
|
|
|
|
*cancelled = HYPERVISOR_suspend(virt_to_mfn(xen_start_info));
|
|
|
|
|
|
|
|
xen_post_suspend(*cancelled);
|
|
|
|
gnttab_resume();
|
|
|
|
xen_mm_unpin_all();
|
|
|
|
|
|
|
|
if (!*cancelled) {
|
|
|
|
xen_irq_resume();
|
|
|
|
xen_console_resume();
|
2008-07-09 00:06:32 +02:00
|
|
|
xen_timer_resume();
|
2008-05-27 00:31:27 +02:00
|
|
|
}
|
|
|
|
|
2009-03-25 18:46:42 +01:00
|
|
|
sysdev_resume();
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|
|
|
2008-05-27 00:31:27 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void do_suspend(void)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
int cancelled = 1;
|
|
|
|
|
|
|
|
shutting_down = SHUTDOWN_SUSPEND;
|
|
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|
|
|
|
#ifdef CONFIG_PREEMPT
|
|
|
|
/* If the kernel is preemptible, we need to freeze all the processes
|
|
|
|
to prevent them from being in the middle of a pagetable update
|
|
|
|
during suspend. */
|
|
|
|
err = freeze_processes();
|
|
|
|
if (err) {
|
|
|
|
printk(KERN_ERR "xen suspend: freeze failed %d\n", err);
|
2010-05-06 18:49:20 +02:00
|
|
|
goto out;
|
2008-05-27 00:31:27 +02:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2009-05-24 22:05:42 +02:00
|
|
|
err = dpm_suspend_start(PMSG_SUSPEND);
|
2008-05-27 00:31:27 +02:00
|
|
|
if (err) {
|
2009-05-24 22:05:42 +02:00
|
|
|
printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err);
|
2009-12-01 12:47:14 +01:00
|
|
|
goto out_thaw;
|
2008-05-27 00:31:27 +02:00
|
|
|
}
|
|
|
|
|
2009-12-17 14:57:09 +01:00
|
|
|
printk(KERN_DEBUG "suspending xenstore...\n");
|
|
|
|
xs_suspend();
|
|
|
|
|
2009-05-24 22:05:42 +02:00
|
|
|
err = dpm_suspend_noirq(PMSG_SUSPEND);
|
2009-03-16 22:34:06 +01:00
|
|
|
if (err) {
|
2009-05-24 22:05:42 +02:00
|
|
|
printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err);
|
2009-12-01 12:47:14 +01:00
|
|
|
goto out_resume;
|
2009-03-16 22:34:06 +01:00
|
|
|
}
|
|
|
|
|
2009-01-11 06:58:09 +01:00
|
|
|
err = stop_machine(xen_suspend, &cancelled, cpumask_of(0));
|
2009-11-24 18:58:49 +01:00
|
|
|
|
|
|
|
dpm_resume_noirq(PMSG_RESUME);
|
|
|
|
|
2008-05-27 00:31:27 +02:00
|
|
|
if (err) {
|
|
|
|
printk(KERN_ERR "failed to start xen_suspend: %d\n", err);
|
2009-12-01 12:47:14 +01:00
|
|
|
cancelled = 1;
|
2008-05-27 00:31:27 +02:00
|
|
|
}
|
|
|
|
|
2009-12-17 14:57:09 +01:00
|
|
|
out_resume:
|
2008-07-09 00:06:32 +02:00
|
|
|
if (!cancelled) {
|
|
|
|
xen_arch_resume();
|
2009-02-09 21:05:50 +01:00
|
|
|
xs_resume();
|
2008-07-09 00:06:32 +02:00
|
|
|
} else
|
2009-02-09 21:05:50 +01:00
|
|
|
xs_suspend_cancel();
|
2008-05-27 00:31:27 +02:00
|
|
|
|
2009-05-24 22:05:42 +02:00
|
|
|
dpm_resume_end(PMSG_RESUME);
|
2008-05-27 00:31:27 +02:00
|
|
|
|
2008-05-27 00:31:28 +02:00
|
|
|
/* Make sure timer events get retriggered on all CPUs */
|
|
|
|
clock_was_set();
|
2009-12-01 12:47:14 +01:00
|
|
|
|
|
|
|
out_thaw:
|
2008-05-27 00:31:27 +02:00
|
|
|
#ifdef CONFIG_PREEMPT
|
|
|
|
thaw_processes();
|
2009-12-01 12:47:14 +01:00
|
|
|
out:
|
2010-05-06 18:49:20 +02:00
|
|
|
#endif
|
2008-05-27 00:31:27 +02:00
|
|
|
shutting_down = SHUTDOWN_INVALID;
|
|
|
|
}
|
2008-05-29 10:02:19 +02:00
|
|
|
#endif /* CONFIG_PM_SLEEP */
|
2007-07-18 03:37:07 +02:00
|
|
|
|
|
|
|
static void shutdown_handler(struct xenbus_watch *watch,
|
|
|
|
const char **vec, unsigned int len)
|
|
|
|
{
|
|
|
|
char *str;
|
|
|
|
struct xenbus_transaction xbt;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
if (shutting_down != SHUTDOWN_INVALID)
|
|
|
|
return;
|
|
|
|
|
|
|
|
again:
|
|
|
|
err = xenbus_transaction_start(&xbt);
|
|
|
|
if (err)
|
|
|
|
return;
|
|
|
|
|
|
|
|
str = (char *)xenbus_read(xbt, "control", "shutdown", NULL);
|
|
|
|
/* Ignore read errors and empty reads. */
|
|
|
|
if (XENBUS_IS_ERR_READ(str)) {
|
|
|
|
xenbus_transaction_end(xbt, 1);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
xenbus_write(xbt, "control", "shutdown", "");
|
|
|
|
|
|
|
|
err = xenbus_transaction_end(xbt, 0);
|
|
|
|
if (err == -EAGAIN) {
|
|
|
|
kfree(str);
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (strcmp(str, "poweroff") == 0 ||
|
2008-05-27 00:31:27 +02:00
|
|
|
strcmp(str, "halt") == 0) {
|
|
|
|
shutting_down = SHUTDOWN_POWEROFF;
|
2007-07-18 03:37:07 +02:00
|
|
|
orderly_poweroff(false);
|
2008-05-27 00:31:27 +02:00
|
|
|
} else if (strcmp(str, "reboot") == 0) {
|
|
|
|
shutting_down = SHUTDOWN_POWEROFF; /* ? */
|
2007-07-18 03:37:07 +02:00
|
|
|
ctrl_alt_del();
|
2008-05-27 00:31:27 +02:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
} else if (strcmp(str, "suspend") == 0) {
|
|
|
|
do_suspend();
|
|
|
|
#endif
|
|
|
|
} else {
|
2007-07-18 03:37:07 +02:00
|
|
|
printk(KERN_INFO "Ignoring shutdown request: %s\n", str);
|
|
|
|
shutting_down = SHUTDOWN_INVALID;
|
|
|
|
}
|
|
|
|
|
|
|
|
kfree(str);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sysrq_handler(struct xenbus_watch *watch, const char **vec,
|
|
|
|
unsigned int len)
|
|
|
|
{
|
|
|
|
char sysrq_key = '\0';
|
|
|
|
struct xenbus_transaction xbt;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
again:
|
|
|
|
err = xenbus_transaction_start(&xbt);
|
|
|
|
if (err)
|
|
|
|
return;
|
|
|
|
if (!xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key)) {
|
|
|
|
printk(KERN_ERR "Unable to read sysrq code in "
|
|
|
|
"control/sysrq\n");
|
|
|
|
xenbus_transaction_end(xbt, 1);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (sysrq_key != '\0')
|
|
|
|
xenbus_printf(xbt, "control", "sysrq", "%c", '\0');
|
|
|
|
|
|
|
|
err = xenbus_transaction_end(xbt, 0);
|
|
|
|
if (err == -EAGAIN)
|
|
|
|
goto again;
|
|
|
|
|
|
|
|
if (sysrq_key != '\0')
|
|
|
|
handle_sysrq(sysrq_key, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct xenbus_watch shutdown_watch = {
|
|
|
|
.node = "control/shutdown",
|
|
|
|
.callback = shutdown_handler
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct xenbus_watch sysrq_watch = {
|
|
|
|
.node = "control/sysrq",
|
|
|
|
.callback = sysrq_handler
|
|
|
|
};
|
|
|
|
|
|
|
|
static int setup_shutdown_watcher(void)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = register_xenbus_watch(&shutdown_watch);
|
|
|
|
if (err) {
|
|
|
|
printk(KERN_ERR "Failed to set shutdown watcher\n");
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
err = register_xenbus_watch(&sysrq_watch);
|
|
|
|
if (err) {
|
|
|
|
printk(KERN_ERR "Failed to set sysrq watcher\n");
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int shutdown_event(struct notifier_block *notifier,
|
|
|
|
unsigned long event,
|
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
setup_shutdown_watcher();
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init setup_shutdown_event(void)
|
|
|
|
{
|
|
|
|
static struct notifier_block xenstore_notifier = {
|
|
|
|
.notifier_call = shutdown_event
|
|
|
|
};
|
|
|
|
register_xenstore_notifier(&xenstore_notifier);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
subsys_initcall(setup_shutdown_event);
|