From: Dmitry Osipenko <dmitry.osipenko@collabora.com>
To: "Thierry Reding" <thierry.reding@gmail.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Russell King" <linux@armlinux.org.uk>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Will Deacon" <will@kernel.org>, "Guo Ren" <guoren@kernel.org>,
"Geert Uytterhoeven" <geert@linux-m68k.org>,
"Greg Ungerer" <gerg@linux-m68k.org>,
"Joshua Thompson" <funaho@jurai.org>,
"Thomas Bogendoerfer" <tsbogend@alpha.franken.de>,
"Sebastian Reichel" <sre@kernel.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
"Philipp Zabel" <p.zabel@pengutronix.de>,
"Greentime Hu" <green.hu@gmail.com>,
"Vincent Chen" <deanbo422@gmail.com>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
"Helge Deller" <deller@gmx.de>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Paul Mackerras" <paulus@samba.org>,
"Paul Walmsley" <paul.walmsley@sifive.com>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
"Yoshinori Sato" <ysato@users.sourceforge.jp>,
"Rich Felker" <dalias@libc.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
"Juergen Gross" <jgross@suse.com>,
"Stefano Stabellini" <sstabellini@kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Len Brown" <lenb@kernel.org>,
"Santosh Shilimkar" <ssantosh@kernel.org>,
"Krzysztof Kozlowski" <krzk@kernel.org>,
"Liam Girdwood" <lgirdwood@gmail.com>,
"Mark Brown" <broonie@kernel.org>, "Pavel Machek" <pavel@ucw.cz>,
"Lee Jones" <lee.jones@linaro.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Guenter Roeck" <linux@roeck-us.net>,
"Daniel Lezcano" <daniel.lezcano@linaro.org>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
"Ulf Hansson" <ulf.hansson@linaro.org>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org,
linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org,
xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org,
linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org
Subject: [PATCH v8 08/27] kernel/reboot: Add register_platform_power_off()
Date: Tue, 10 May 2022 02:32:16 +0300 [thread overview]
Message-ID: <20220509233235.995021-9-dmitry.osipenko@collabora.com> (raw)
In-Reply-To: <20220509233235.995021-1-dmitry.osipenko@collabora.com>
Add platform-level registration helpers that will ease transition of the
arch/platform power-off callbacks to the new sys-off based API, allowing
us to remove the global pm_power_off variable in the future.
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
include/linux/reboot.h | 3 +++
kernel/reboot.c | 55 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index c52f77ee4ddd..f185b64faae0 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -141,6 +141,9 @@ int devm_register_sys_off_handler(struct device *dev,
int (*callback)(struct sys_off_data *data),
void *cb_data);
+int register_platform_power_off(void (*power_off)(void));
+void unregister_platform_power_off(void (*power_off)(void));
+
/*
* Architecture independent implemenations of sys_reboot commands.
*/
diff --git a/kernel/reboot.c b/kernel/reboot.c
index 982e58c11ce8..e74103f2a801 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -469,6 +469,61 @@ int devm_register_sys_off_handler(struct device *dev,
}
EXPORT_SYMBOL_GPL(devm_register_sys_off_handler);
+static struct sys_off_handler *platform_power_off_handler;
+
+static int platform_power_off_notify(struct sys_off_data *data)
+{
+ void (*platform_power_power_off_cb)(void) = data->cb_data;
+
+ platform_power_power_off_cb();
+
+ return NOTIFY_DONE;
+}
+
+/**
+ * register_platform_power_off - Register platform-level power-off callback
+ * @power_off: Power-off callback
+ *
+ * Registers power-off callback that will be called as last step
+ * of the power-off sequence. This callback is expected to be invoked
+ * for the last resort. Only one platform power-off callback is allowed
+ * to be registered at a time.
+ *
+ * Returns zero on success, or error code on failure.
+ */
+int register_platform_power_off(void (*power_off)(void))
+{
+ struct sys_off_handler *handler;
+
+ handler = register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
+ SYS_OFF_PRIO_PLATFORM,
+ platform_power_off_notify,
+ power_off);
+ if (IS_ERR(handler))
+ return PTR_ERR(handler);
+
+ platform_power_off_handler = handler;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(register_platform_power_off);
+
+/**
+ * unregister_platform_power_off - Unregister platform-level power-off callback
+ * @power_off: Power-off callback
+ *
+ * Unregisters previously registered platform power-off callback.
+ */
+void unregister_platform_power_off(void (*power_off)(void))
+{
+ if (platform_power_off_handler &&
+ platform_power_off_handler->cb_data == power_off) {
+ unregister_sys_off_handler(platform_power_off_handler);
+ platform_power_off_handler = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(unregister_platform_power_off);
+
static int legacy_pm_power_off_prepare(struct sys_off_data *data)
{
if (pm_power_off_prepare)
--
2.35.1
next prev parent reply other threads:[~2022-05-09 23:35 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-09 23:32 [PATCH v8 00/27] Introduce power-off+restart call chain API Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 01/27] notifier: Add atomic_notifier_call_chain_is_empty() Dmitry Osipenko
2022-05-10 18:14 ` Rafael J. Wysocki
2022-05-11 10:12 ` Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 02/27] notifier: Add blocking/atomic_notifier_chain_register_unique_prio() Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 03/27] kernel/reboot: Introduce sys-off handler API Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 04/27] kernel/reboot: Wrap legacy power-off callbacks into sys-off handlers Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 05/27] kernel/reboot: Add do_kernel_power_off() Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 06/27] kernel/reboot: Add stub for pm_power_off Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 07/27] kernel/reboot: Add kernel_can_power_off() Dmitry Osipenko
2022-05-24 13:14 ` Geert Uytterhoeven
2022-05-24 13:41 ` Dmitry Osipenko
2022-05-24 15:03 ` Geert Uytterhoeven
2022-05-24 20:16 ` Dmitry Osipenko
2022-05-09 23:32 ` Dmitry Osipenko [this message]
2022-05-09 23:32 ` [PATCH v8 09/27] ARM: Use do_kernel_power_off() Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 10/27] csky: " Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 11/27] riscv: " Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 12/27] arm64: " Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 13/27] parisc: " Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 14/27] xen/x86: " Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 15/27] powerpc: " Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 16/27] m68k: Switch to new sys-off handler API Dmitry Osipenko
2022-05-31 19:04 ` Geert Uytterhoeven
2022-05-31 21:24 ` Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 17/27] sh: Use do_kernel_power_off() Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 18/27] x86: " Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 19/27] ia64: " Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 20/27] mips: " Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 21/27] memory: emif: Use kernel_can_power_off() Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 22/27] ACPI: power: Switch to sys-off handler API Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 23/27] regulator: pfuze100: Use devm_register_sys_off_handler() Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 24/27] reboot: Remove pm_power_off_prepare() Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 25/27] soc/tegra: pmc: Use sys-off handler API to power off Nexus 7 properly Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 26/27] kernel/reboot: Add devm_register_power_off_handler() Dmitry Osipenko
2022-05-09 23:32 ` [PATCH v8 27/27] kernel/reboot: Add devm_register_restart_handler() Dmitry Osipenko
2022-05-18 14:46 ` [PATCH v8 00/27] Introduce power-off+restart call chain API Rafael J. Wysocki
2022-05-19 10:57 ` Dmitry Osipenko
2022-05-23 18:00 ` Geert Uytterhoeven
2022-05-24 13:43 ` Rafael J. Wysocki
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