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123 lines
2.6 KiB
123 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0
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/* sstate.c: System soft state support.
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*
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* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
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*/
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#include <linux/kernel.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <asm/hypervisor.h>
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#include <asm/spitfire.h>
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#include <asm/oplib.h>
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#include <asm/head.h>
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#include <asm/io.h>
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#include "kernel.h"
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static int hv_supports_soft_state;
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static void do_set_sstate(unsigned long state, const char *msg)
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{
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unsigned long err;
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if (!hv_supports_soft_state)
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return;
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err = sun4v_mach_set_soft_state(state, kimage_addr_to_ra(msg));
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if (err) {
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printk(KERN_WARNING "SSTATE: Failed to set soft-state to "
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"state[%lx] msg[%s], err=%lu\n",
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state, msg, err);
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}
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}
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static const char booting_msg[32] __attribute__((aligned(32))) =
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"Linux booting";
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static const char running_msg[32] __attribute__((aligned(32))) =
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"Linux running";
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static const char halting_msg[32] __attribute__((aligned(32))) =
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"Linux halting";
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static const char poweroff_msg[32] __attribute__((aligned(32))) =
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"Linux powering off";
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static const char rebooting_msg[32] __attribute__((aligned(32))) =
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"Linux rebooting";
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static const char panicking_msg[32] __attribute__((aligned(32))) =
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"Linux panicking";
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static int sstate_reboot_call(struct notifier_block *np, unsigned long type, void *_unused)
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{
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const char *msg;
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switch (type) {
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case SYS_DOWN:
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default:
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msg = rebooting_msg;
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break;
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case SYS_HALT:
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msg = halting_msg;
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break;
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case SYS_POWER_OFF:
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msg = poweroff_msg;
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break;
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}
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do_set_sstate(HV_SOFT_STATE_TRANSITION, msg);
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return NOTIFY_OK;
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}
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static struct notifier_block sstate_reboot_notifier = {
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.notifier_call = sstate_reboot_call,
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};
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static int sstate_panic_event(struct notifier_block *n, unsigned long event, void *ptr)
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{
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do_set_sstate(HV_SOFT_STATE_TRANSITION, panicking_msg);
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return NOTIFY_DONE;
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}
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static struct notifier_block sstate_panic_block = {
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.notifier_call = sstate_panic_event,
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.priority = INT_MAX,
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};
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static int __init sstate_init(void)
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{
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unsigned long major, minor;
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if (tlb_type != hypervisor)
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return 0;
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major = 1;
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minor = 0;
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if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor))
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return 0;
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hv_supports_soft_state = 1;
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prom_sun4v_guest_soft_state();
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do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg);
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atomic_notifier_chain_register(&panic_notifier_list,
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&sstate_panic_block);
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register_reboot_notifier(&sstate_reboot_notifier);
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return 0;
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}
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core_initcall(sstate_init);
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static int __init sstate_running(void)
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{
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do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg);
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return 0;
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}
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late_initcall(sstate_running);
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