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powerpc/powernv: Add OPAL soft-poweroff routine
Register a notifier for a OPAL message indicating that the machine should prepare itself for a graceful power off. OPAL will tell us if the power off is a reboot or shutdown, but for now we perform the same orderly_poweroff action. Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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3 changed files with 67 additions and 2 deletions
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@ -304,7 +304,7 @@ enum OpalMessageType {
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*/
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OPAL_MSG_MEM_ERR,
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OPAL_MSG_EPOW,
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OPAL_MSG_SHUTDOWN,
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OPAL_MSG_SHUTDOWN, /* params[0] = 1 reboot, 0 shutdown */
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OPAL_MSG_HMI_EVT,
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OPAL_MSG_TYPE_MAX,
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};
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@ -1,7 +1,7 @@
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obj-y += setup.o opal-wrappers.o opal.o opal-async.o
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obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
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obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
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obj-y += opal-msglog.o opal-hmi.o
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obj-y += opal-msglog.o opal-hmi.o opal-power.o
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obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o
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obj-$(CONFIG_PCI) += pci.o pci-p5ioc2.o pci-ioda.o
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65
arch/powerpc/platforms/powernv/opal-power.c
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65
arch/powerpc/platforms/powernv/opal-power.c
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@ -0,0 +1,65 @@
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/*
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* PowerNV OPAL power control for graceful shutdown handling
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*
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* Copyright 2015 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/reboot.h>
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#include <linux/notifier.h>
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#include <asm/opal.h>
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#include <asm/machdep.h>
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#define SOFT_OFF 0x00
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#define SOFT_REBOOT 0x01
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static int opal_power_control_event(struct notifier_block *nb,
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unsigned long msg_type, void *msg)
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{
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struct opal_msg *power_msg = msg;
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uint64_t type;
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type = be64_to_cpu(power_msg->params[0]);
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switch (type) {
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case SOFT_REBOOT:
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/* Fall through. The service processor is responsible for
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* bringing the machine back up */
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case SOFT_OFF:
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pr_info("OPAL: poweroff requested\n");
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orderly_poweroff(true);
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break;
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default:
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pr_err("OPAL: power control type unexpected %016llx\n", type);
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}
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return 0;
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}
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static struct notifier_block opal_power_control_nb = {
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.notifier_call = opal_power_control_event,
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.next = NULL,
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.priority = 0,
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};
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static int __init opal_power_control_init(void)
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{
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int ret;
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ret = opal_message_notifier_register(OPAL_MSG_SHUTDOWN,
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&opal_power_control_nb);
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if (ret) {
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pr_err("%s: Can't register OPAL event notifier (%d)\n",
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__func__, ret);
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return ret;
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}
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return 0;
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}
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machine_subsys_initcall(powernv, opal_power_control_init);
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