2019-05-19 15:08:55 +03:00
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// SPDX-License-Identifier: GPL-2.0-only
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2007-07-18 05:37:07 +04:00
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/*
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* Handle extern requests for shutdown, reboot and sysrq
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*/
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2013-06-28 14:21:41 +04:00
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#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
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2007-07-18 05:37:07 +04:00
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#include <linux/kernel.h>
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#include <linux/err.h>
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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 11:04:11 +03:00
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#include <linux/slab.h>
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2007-07-18 05:37:07 +04:00
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#include <linux/reboot.h>
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#include <linux/sysrq.h>
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2008-05-27 02:31:27 +04:00
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#include <linux/stop_machine.h>
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#include <linux/freezer.h>
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2011-04-20 02:36:11 +04:00
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#include <linux/syscore_ops.h>
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2011-07-10 21:22:07 +04:00
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#include <linux/export.h>
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2007-07-18 05:37:07 +04:00
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2010-05-14 15:45:07 +04:00
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#include <xen/xen.h>
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2007-07-18 05:37:07 +04:00
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#include <xen/xenbus.h>
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2008-05-27 02:31:27 +04:00
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#include <xen/grant_table.h>
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#include <xen/events.h>
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#include <xen/hvc-console.h>
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2015-06-17 17:28:02 +03:00
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#include <xen/page.h>
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2008-05-27 02:31:27 +04:00
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#include <xen/xen-ops.h>
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2007-07-18 05:37:07 +04:00
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2008-05-27 02:31:27 +04:00
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#include <asm/xen/hypercall.h>
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2010-05-14 15:45:07 +04:00
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#include <asm/xen/hypervisor.h>
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2008-05-27 02:31:27 +04:00
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enum shutdown_state {
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SHUTDOWN_INVALID = -1,
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SHUTDOWN_POWEROFF = 0,
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SHUTDOWN_SUSPEND = 2,
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/* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only
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report a crash, not be instructed to crash!
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HALT is the same as POWEROFF, as far as we're concerned. The tools use
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the distinction when we return the reason code to them. */
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SHUTDOWN_HALT = 4,
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};
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2007-07-18 05:37:07 +04:00
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/* Ignore multiple shutdown requests. */
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2008-05-27 02:31:27 +04:00
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static enum shutdown_state shutting_down = SHUTDOWN_INVALID;
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2011-02-17 14:04:20 +03:00
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struct suspend_info {
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int cancelled;
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};
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2014-02-26 14:30:30 +04:00
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static RAW_NOTIFIER_HEAD(xen_resume_notifier);
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void xen_resume_notifier_register(struct notifier_block *nb)
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{
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raw_notifier_chain_register(&xen_resume_notifier, nb);
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}
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EXPORT_SYMBOL_GPL(xen_resume_notifier_register);
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void xen_resume_notifier_unregister(struct notifier_block *nb)
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{
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raw_notifier_chain_unregister(&xen_resume_notifier, nb);
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}
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EXPORT_SYMBOL_GPL(xen_resume_notifier_unregister);
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2013-06-27 17:28:38 +04:00
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#ifdef CONFIG_HIBERNATE_CALLBACKS
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2010-05-14 15:45:07 +04:00
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static int xen_suspend(void *data)
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{
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2011-02-17 14:04:20 +03:00
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struct suspend_info *si = data;
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2008-05-27 02:31:28 +04:00
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int err;
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2008-05-27 02:31:27 +04:00
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BUG_ON(!irqs_disabled());
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2011-04-26 21:15:07 +04:00
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err = syscore_suspend();
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2009-02-22 20:38:50 +03:00
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if (err) {
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2013-06-28 14:21:41 +04:00
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pr_err("%s: system core suspend failed: %d\n", __func__, err);
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2009-02-22 20:38:50 +03:00
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return err;
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}
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2008-05-27 02:31:28 +04:00
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2014-05-08 14:09:23 +04:00
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gnttab_suspend();
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2017-11-01 04:46:33 +03:00
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xen_manage_runstate_time(-1);
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2014-05-08 14:09:23 +04:00
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xen_arch_pre_suspend();
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2008-05-27 02:31:27 +04:00
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2014-05-08 14:09:23 +04:00
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si->cancelled = HYPERVISOR_suspend(xen_pv_domain()
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2015-08-07 19:34:37 +03:00
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? virt_to_gfn(xen_start_info)
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2014-05-08 14:09:23 +04:00
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: 0);
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2008-05-27 02:31:27 +04:00
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2014-05-08 14:09:23 +04:00
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xen_arch_post_suspend(si->cancelled);
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2017-11-01 04:46:33 +03:00
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xen_manage_runstate_time(si->cancelled ? 1 : 0);
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2014-05-08 14:09:23 +04:00
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gnttab_resume();
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2008-05-27 02:31:27 +04:00
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2011-02-17 14:04:20 +03:00
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if (!si->cancelled) {
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2008-05-27 02:31:27 +04:00
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xen_irq_resume();
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2008-07-09 02:06:32 +04:00
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xen_timer_resume();
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2008-05-27 02:31:27 +04:00
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}
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2011-04-20 02:36:11 +04:00
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syscore_resume();
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2009-03-25 20:46:42 +03:00
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2008-05-27 02:31:27 +04:00
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return 0;
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}
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static void do_suspend(void)
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{
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int err;
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2011-02-17 14:04:20 +03:00
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struct suspend_info si;
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2008-05-27 02:31:27 +04:00
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shutting_down = SHUTDOWN_SUSPEND;
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err = freeze_processes();
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if (err) {
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2015-01-19 16:19:38 +03:00
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pr_err("%s: freeze processes failed %d\n", __func__, err);
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2010-05-06 20:49:20 +04:00
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goto out;
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2008-05-27 02:31:27 +04:00
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}
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2015-01-19 16:19:38 +03:00
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err = freeze_kernel_threads();
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if (err) {
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pr_err("%s: freeze kernel threads failed %d\n", __func__, err);
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goto out_thaw;
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}
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2011-02-23 01:59:06 +03:00
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err = dpm_suspend_start(PMSG_FREEZE);
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2008-05-27 02:31:27 +04:00
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if (err) {
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2013-06-28 14:21:41 +04:00
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pr_err("%s: dpm_suspend_start %d\n", __func__, err);
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2009-12-01 14:47:14 +03:00
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goto out_thaw;
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2008-05-27 02:31:27 +04:00
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}
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2009-12-17 16:57:09 +03:00
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printk(KERN_DEBUG "suspending xenstore...\n");
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xs_suspend();
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2012-01-29 23:38:29 +04:00
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err = dpm_suspend_end(PMSG_FREEZE);
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2009-03-17 00:34:06 +03:00
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if (err) {
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2013-06-28 14:21:41 +04:00
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pr_err("dpm_suspend_end failed: %d\n", err);
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2012-04-17 22:35:49 +04:00
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si.cancelled = 0;
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2009-12-01 14:47:14 +03:00
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goto out_resume;
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2009-03-17 00:34:06 +03:00
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}
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2015-04-29 01:46:20 +03:00
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xen_arch_suspend();
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2011-02-17 14:04:20 +03:00
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si.cancelled = 1;
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2011-02-17 14:04:20 +03:00
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err = stop_machine(xen_suspend, &si, cpumask_of(0));
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2009-11-24 20:58:49 +03:00
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2014-07-02 20:25:23 +04:00
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/* Resume console as early as possible. */
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if (!si.cancelled)
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xen_console_resume();
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2014-02-26 14:30:30 +04:00
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raw_notifier_call_chain(&xen_resume_notifier, 0, NULL);
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2012-01-29 23:38:29 +04:00
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dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
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2009-11-24 20:58:49 +03:00
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2008-05-27 02:31:27 +04:00
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if (err) {
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2013-06-28 14:21:41 +04:00
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pr_err("failed to start xen_suspend: %d\n", err);
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2011-02-17 14:04:20 +03:00
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si.cancelled = 1;
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2008-05-27 02:31:27 +04:00
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}
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2015-04-29 01:46:20 +03:00
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xen_arch_resume();
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2009-12-17 16:57:09 +03:00
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out_resume:
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2015-04-29 01:46:20 +03:00
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if (!si.cancelled)
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2009-02-09 23:05:50 +03:00
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xs_resume();
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2015-04-29 01:46:20 +03:00
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else
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2009-02-09 23:05:50 +03:00
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xs_suspend_cancel();
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2008-05-27 02:31:27 +04:00
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2011-02-23 01:59:06 +03:00
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dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
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2008-05-27 02:31:27 +04:00
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2009-12-01 14:47:14 +03:00
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out_thaw:
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2008-05-27 02:31:27 +04:00
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thaw_processes();
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2009-12-01 14:47:14 +03:00
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out:
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2008-05-27 02:31:27 +04:00
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shutting_down = SHUTDOWN_INVALID;
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}
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2011-04-12 00:54:42 +04:00
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#endif /* CONFIG_HIBERNATE_CALLBACKS */
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2007-07-18 05:37:07 +04:00
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2011-02-17 14:04:20 +03:00
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struct shutdown_handler {
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2016-10-11 14:34:16 +03:00
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#define SHUTDOWN_CMD_SIZE 11
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const char command[SHUTDOWN_CMD_SIZE];
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bool flag;
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2011-02-17 14:04:20 +03:00
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void (*cb)(void);
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};
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2014-04-04 22:53:41 +04:00
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static int poweroff_nb(struct notifier_block *cb, unsigned long code, void *unused)
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{
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switch (code) {
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case SYS_DOWN:
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case SYS_HALT:
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case SYS_POWER_OFF:
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shutting_down = SHUTDOWN_POWEROFF;
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2020-11-20 21:40:55 +03:00
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break;
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2014-04-04 22:53:41 +04:00
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default:
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break;
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}
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return NOTIFY_DONE;
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}
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2011-02-17 14:04:20 +03:00
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static void do_poweroff(void)
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{
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2014-04-04 22:53:41 +04:00
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switch (system_state) {
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case SYSTEM_BOOTING:
|
2017-05-16 21:42:47 +03:00
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case SYSTEM_SCHEDULING:
|
2014-04-04 22:53:41 +04:00
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orderly_poweroff(true);
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break;
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case SYSTEM_RUNNING:
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orderly_poweroff(false);
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break;
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default:
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/* Don't do it when we are halting/rebooting. */
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pr_info("Ignoring Xen toolstack shutdown.\n");
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break;
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}
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2011-02-17 14:04:20 +03:00
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}
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static void do_reboot(void)
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{
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shutting_down = SHUTDOWN_POWEROFF; /* ? */
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ctrl_alt_del();
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}
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2016-10-11 14:34:16 +03:00
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static struct shutdown_handler shutdown_handlers[] = {
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{ "poweroff", true, do_poweroff },
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{ "halt", false, do_poweroff },
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{ "reboot", true, do_reboot },
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#ifdef CONFIG_HIBERNATE_CALLBACKS
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{ "suspend", true, do_suspend },
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#endif
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};
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|
2007-07-18 05:37:07 +04:00
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static void shutdown_handler(struct xenbus_watch *watch,
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2017-02-09 16:39:57 +03:00
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const char *path, const char *token)
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2007-07-18 05:37:07 +04:00
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{
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char *str;
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struct xenbus_transaction xbt;
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int err;
|
2016-10-11 14:34:16 +03:00
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int idx;
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2007-07-18 05:37:07 +04:00
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if (shutting_down != SHUTDOWN_INVALID)
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return;
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again:
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err = xenbus_transaction_start(&xbt);
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if (err)
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return;
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str = (char *)xenbus_read(xbt, "control", "shutdown", NULL);
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/* Ignore read errors and empty reads. */
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if (XENBUS_IS_ERR_READ(str)) {
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xenbus_transaction_end(xbt, 1);
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return;
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}
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2016-10-11 14:34:16 +03:00
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for (idx = 0; idx < ARRAY_SIZE(shutdown_handlers); idx++) {
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if (strcmp(str, shutdown_handlers[idx].command) == 0)
|
2011-02-17 14:04:20 +03:00
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break;
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}
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/* Only acknowledge commands which we are prepared to handle. */
|
2016-10-11 14:34:16 +03:00
|
|
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if (idx < ARRAY_SIZE(shutdown_handlers))
|
2011-02-17 14:04:20 +03:00
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xenbus_write(xbt, "control", "shutdown", "");
|
2007-07-18 05:37:07 +04:00
|
|
|
|
|
|
|
err = xenbus_transaction_end(xbt, 0);
|
|
|
|
if (err == -EAGAIN) {
|
|
|
|
kfree(str);
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
|
2016-10-11 14:34:16 +03:00
|
|
|
if (idx < ARRAY_SIZE(shutdown_handlers)) {
|
|
|
|
shutdown_handlers[idx].cb();
|
2008-05-27 02:31:27 +04:00
|
|
|
} else {
|
2013-06-28 14:21:41 +04:00
|
|
|
pr_info("Ignoring shutdown request: %s\n", str);
|
2007-07-18 05:37:07 +04:00
|
|
|
shutting_down = SHUTDOWN_INVALID;
|
|
|
|
}
|
|
|
|
|
|
|
|
kfree(str);
|
|
|
|
}
|
|
|
|
|
2010-05-25 01:33:41 +04:00
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
2017-02-09 16:39:57 +03:00
|
|
|
static void sysrq_handler(struct xenbus_watch *watch, const char *path,
|
|
|
|
const char *token)
|
2007-07-18 05:37:07 +04:00
|
|
|
{
|
|
|
|
char sysrq_key = '\0';
|
|
|
|
struct xenbus_transaction xbt;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
again:
|
|
|
|
err = xenbus_transaction_start(&xbt);
|
|
|
|
if (err)
|
|
|
|
return;
|
2017-05-30 21:52:26 +03:00
|
|
|
err = xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key);
|
|
|
|
if (err < 0) {
|
|
|
|
/*
|
|
|
|
* The Xenstore watch fires directly after registering it and
|
|
|
|
* after a suspend/resume cycle. So ENOENT is no error but
|
2018-09-06 14:26:08 +03:00
|
|
|
* might happen in those cases. ERANGE is observed when we get
|
|
|
|
* an empty value (''), this happens when we acknowledge the
|
|
|
|
* request by writing '\0' below.
|
2017-05-30 21:52:26 +03:00
|
|
|
*/
|
2018-09-06 14:26:08 +03:00
|
|
|
if (err != -ENOENT && err != -ERANGE)
|
2017-05-30 21:52:26 +03:00
|
|
|
pr_err("Error %d reading sysrq code in control/sysrq\n",
|
|
|
|
err);
|
2007-07-18 05:37:07 +04:00
|
|
|
xenbus_transaction_end(xbt, 1);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2018-06-15 02:34:52 +03:00
|
|
|
if (sysrq_key != '\0') {
|
|
|
|
err = xenbus_printf(xbt, "control", "sysrq", "%c", '\0');
|
|
|
|
if (err) {
|
|
|
|
pr_err("%s: Error %d writing sysrq in control/sysrq\n",
|
|
|
|
__func__, err);
|
|
|
|
xenbus_transaction_end(xbt, 1);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
2007-07-18 05:37:07 +04:00
|
|
|
|
|
|
|
err = xenbus_transaction_end(xbt, 0);
|
|
|
|
if (err == -EAGAIN)
|
|
|
|
goto again;
|
|
|
|
|
|
|
|
if (sysrq_key != '\0')
|
2010-08-18 08:15:47 +04:00
|
|
|
handle_sysrq(sysrq_key);
|
2007-07-18 05:37:07 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct xenbus_watch sysrq_watch = {
|
|
|
|
.node = "control/sysrq",
|
|
|
|
.callback = sysrq_handler
|
|
|
|
};
|
2010-05-25 01:33:41 +04:00
|
|
|
#endif
|
|
|
|
|
|
|
|
static struct xenbus_watch shutdown_watch = {
|
|
|
|
.node = "control/shutdown",
|
|
|
|
.callback = shutdown_handler
|
|
|
|
};
|
2007-07-18 05:37:07 +04:00
|
|
|
|
2014-04-04 22:53:41 +04:00
|
|
|
static struct notifier_block xen_reboot_nb = {
|
|
|
|
.notifier_call = poweroff_nb,
|
|
|
|
};
|
|
|
|
|
2007-07-18 05:37:07 +04:00
|
|
|
static int setup_shutdown_watcher(void)
|
|
|
|
{
|
|
|
|
int err;
|
2016-10-11 14:34:16 +03:00
|
|
|
int idx;
|
|
|
|
#define FEATURE_PATH_SIZE (SHUTDOWN_CMD_SIZE + sizeof("feature-"))
|
|
|
|
char node[FEATURE_PATH_SIZE];
|
2007-07-18 05:37:07 +04:00
|
|
|
|
|
|
|
err = register_xenbus_watch(&shutdown_watch);
|
|
|
|
if (err) {
|
2013-06-28 14:21:41 +04:00
|
|
|
pr_err("Failed to set shutdown watcher\n");
|
2007-07-18 05:37:07 +04:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2014-04-04 22:53:41 +04:00
|
|
|
|
2010-05-25 01:33:41 +04:00
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
2007-07-18 05:37:07 +04:00
|
|
|
err = register_xenbus_watch(&sysrq_watch);
|
|
|
|
if (err) {
|
2013-06-28 14:21:41 +04:00
|
|
|
pr_err("Failed to set sysrq watcher\n");
|
2007-07-18 05:37:07 +04:00
|
|
|
return err;
|
|
|
|
}
|
2010-05-25 01:33:41 +04:00
|
|
|
#endif
|
2007-07-18 05:37:07 +04:00
|
|
|
|
2016-10-11 14:34:16 +03:00
|
|
|
for (idx = 0; idx < ARRAY_SIZE(shutdown_handlers); idx++) {
|
|
|
|
if (!shutdown_handlers[idx].flag)
|
|
|
|
continue;
|
|
|
|
snprintf(node, FEATURE_PATH_SIZE, "feature-%s",
|
|
|
|
shutdown_handlers[idx].command);
|
2018-06-15 02:34:52 +03:00
|
|
|
err = xenbus_printf(XBT_NIL, "control", node, "%u", 1);
|
|
|
|
if (err) {
|
|
|
|
pr_err("%s: Error %d writing %s\n", __func__,
|
|
|
|
err, node);
|
|
|
|
return err;
|
|
|
|
}
|
2016-10-11 14:34:16 +03:00
|
|
|
}
|
|
|
|
|
2007-07-18 05:37:07 +04:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int shutdown_event(struct notifier_block *notifier,
|
|
|
|
unsigned long event,
|
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
setup_shutdown_watcher();
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
2010-05-14 15:45:07 +04:00
|
|
|
int xen_setup_shutdown_event(void)
|
2007-07-18 05:37:07 +04:00
|
|
|
{
|
|
|
|
static struct notifier_block xenstore_notifier = {
|
|
|
|
.notifier_call = shutdown_event
|
|
|
|
};
|
2010-12-02 20:54:50 +03:00
|
|
|
|
|
|
|
if (!xen_domain())
|
|
|
|
return -ENODEV;
|
2007-07-18 05:37:07 +04:00
|
|
|
register_xenstore_notifier(&xenstore_notifier);
|
2014-04-04 22:53:41 +04:00
|
|
|
register_reboot_notifier(&xen_reboot_nb);
|
2007-07-18 05:37:07 +04:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2010-05-17 20:08:21 +04:00
|
|
|
EXPORT_SYMBOL_GPL(xen_setup_shutdown_event);
|
2007-07-18 05:37:07 +04:00
|
|
|
|
2010-12-02 20:54:50 +03:00
|
|
|
subsys_initcall(xen_setup_shutdown_event);
|