linux-kernel - [PATCH v8 05/27] kernel/reboot: Add do_kernel_power

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Message-Id: <20220509233235.995021-6-dmitry.osipenko@collabora.com>
Date:   Tue, 10 May 2022 02:32:13 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
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        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
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        Linus Walleij <linus.walleij@...aro.org>,
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        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
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        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
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Cc:     linux-kernel@...r.kernel.org, linux-csky@...r.kernel.org,
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Subject: [PATCH v8 05/27] kernel/reboot: Add do_kernel_power_off()

Add do_kernel_power_off() helper that will remove open-coded pm_power_off
invocations from the architecture code. This is the first step on the way
to remove the global pm_power_off variable, which will allow us to
implement consistent power-off chaining support.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
---
 include/linux/reboot.h |  2 ++
 kernel/reboot.c        | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index 05981ef079d8..6b951d68c0c7 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -63,6 +63,8 @@ extern void machine_shutdown(void);
 struct pt_regs;
 extern void machine_crash_shutdown(struct pt_regs *);
 
+void do_kernel_power_off(void);
+
 /*
  * sys-off handler API.
  */
diff --git a/kernel/reboot.c b/kernel/reboot.c
index 2fb0357d9483..9afa99a32d62 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -504,6 +504,19 @@ static void do_kernel_power_off_prepare(void)
 	blocking_notifier_call_chain(&power_off_prep_handler_list, 0, NULL);
 }
 
+/**
+ *	do_kernel_power_off - Execute kernel power-off handler call chain
+ *
+ *	Expected to be called as last step of the power-off sequence.
+ *
+ *	Powers off the system immediately if a power-off handler function has
+ *	been registered. Otherwise does nothing.
+ */
+void do_kernel_power_off(void)
+{
+	atomic_notifier_call_chain(&power_off_handler_list, 0, NULL);
+}
+
 /**
  *	kernel_power_off - power_off the system
  *
-- 
2.35.1