[linux-2.6-block.git] / arch / sparc / kernel / sstate.c

// SPDX-License-Identifier: GPL-2.0
/* sstate.c: System soft state support.
 *
 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
 */

#include <linux/kernel.h>
#include <linux/notifier.h>
#include <linux/panic_notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>

#include <asm/hypervisor.h>
#include <asm/spitfire.h>
#include <asm/oplib.h>
#include <asm/head.h>
#include <asm/io.h>

#include "kernel.h"

static int hv_supports_soft_state;

static void do_set_sstate(unsigned long state, const char *msg)
{
	unsigned long err;

	if (!hv_supports_soft_state)
		return;

	err = sun4v_mach_set_soft_state(state, kimage_addr_to_ra(msg));
	if (err) {
		printk(KERN_WARNING "SSTATE: Failed to set soft-state to "
		       "state[%lx] msg[%s], err=%lu\n",
		       state, msg, err);
	}
}

static const char booting_msg[32] __attribute__((aligned(32))) =
	"Linux booting";
static const char running_msg[32] __attribute__((aligned(32))) =
	"Linux running";
static const char halting_msg[32] __attribute__((aligned(32))) =
	"Linux halting";
static const char poweroff_msg[32] __attribute__((aligned(32))) =
	"Linux powering off";
static const char rebooting_msg[32] __attribute__((aligned(32))) =
	"Linux rebooting";
static const char panicking_msg[32] __attribute__((aligned(32))) =
	"Linux panicking";

static int sstate_reboot_call(struct notifier_block *np, unsigned long type, void *_unused)
{
	const char *msg;

	switch (type) {
	case SYS_DOWN:
	default:
		msg = rebooting_msg;
		break;

	case SYS_HALT:
		msg = halting_msg;
		break;

	case SYS_POWER_OFF:
		msg = poweroff_msg;
		break;
	}

	do_set_sstate(HV_SOFT_STATE_TRANSITION, msg);

	return NOTIFY_OK;
}

static struct notifier_block sstate_reboot_notifier = {
	.notifier_call = sstate_reboot_call,
};

static int sstate_panic_event(struct notifier_block *n, unsigned long event, void *ptr)
{
	do_set_sstate(HV_SOFT_STATE_TRANSITION, panicking_msg);

	return NOTIFY_DONE;
}

static struct notifier_block sstate_panic_block = {
	.notifier_call	=	sstate_panic_event,
	.priority	=	INT_MAX,
};

static int __init sstate_init(void)
{
	unsigned long major, minor;

	if (tlb_type != hypervisor)
		return 0;

	major = 1;
	minor = 0;
	if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor))
		return 0;

	hv_supports_soft_state = 1;

	prom_sun4v_guest_soft_state();

	do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg);

	atomic_notifier_chain_register(&panic_notifier_list,
				       &sstate_panic_block);
	register_reboot_notifier(&sstate_reboot_notifier);

	return 0;
}

core_initcall(sstate_init);

static int __init sstate_running(void)
{
	do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg);
	return 0;
}

late_initcall(sstate_running);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
22d6a1cb DM	2	/* sstate.c: System soft state support.
22d6a1cb DM	3	*
446139a8	4	* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
22d6a1cb DM	5	*/
	6
	7	#include <linux/kernel.h>
	8	#include <linux/notifier.h>
f39650de	9	#include <linux/panic_notifier.h>
446139a8	10	#include <linux/reboot.h>
22d6a1cb DM	11	#include <linux/init.h>
	12
	13	#include <asm/hypervisor.h>
446139a8	14	#include <asm/spitfire.h>
22d6a1cb DM	15	#include <asm/oplib.h>
	16	#include <asm/head.h>
	17	#include <asm/io.h>
	18
ea5e7447	19	#include "kernel.h"
22d6a1cb	20
ea5e7447	21	static int hv_supports_soft_state;
22d6a1cb DM	22
	23	static void do_set_sstate(unsigned long state, const char *msg)
	24	{
	25	unsigned long err;
	26
	27	if (!hv_supports_soft_state)
	28	return;
	29
	30	err = sun4v_mach_set_soft_state(state, kimage_addr_to_ra(msg));
	31	if (err) {
	32	printk(KERN_WARNING "SSTATE: Failed to set soft-state to "
	33	"state[%lx] msg[%s], err=%lu\n",
	34	state, msg, err);
	35	}
	36	}
	37
	38	static const char booting_msg[32] __attribute__((aligned(32))) =
	39	"Linux booting";
	40	static const char running_msg[32] __attribute__((aligned(32))) =
	41	"Linux running";
	42	static const char halting_msg[32] __attribute__((aligned(32))) =
	43	"Linux halting";
	44	static const char poweroff_msg[32] __attribute__((aligned(32))) =
	45	"Linux powering off";
	46	static const char rebooting_msg[32] __attribute__((aligned(32))) =
	47	"Linux rebooting";
5d0e7705 TH	48	static const char panicking_msg[32] __attribute__((aligned(32))) =
5d0e7705 TH	49	"Linux panicking";
22d6a1cb	50
446139a8	51	static int sstate_reboot_call(struct notifier_block np, unsigned long type, void _unused)
22d6a1cb	52	{
446139a8	53	const char *msg;
22d6a1cb	54
446139a8 DM	55	switch (type) {
	56	case SYS_DOWN:
	57	default:
	58	msg = rebooting_msg;
	59	break;
22d6a1cb	60
446139a8 DM	61	case SYS_HALT:
	62	msg = halting_msg;
	63	break;
22d6a1cb	64
446139a8 DM	65	case SYS_POWER_OFF:
	66	msg = poweroff_msg;
	67	break;
	68	}
22d6a1cb	69
446139a8 DM	70	do_set_sstate(HV_SOFT_STATE_TRANSITION, msg);
	71
	72	return NOTIFY_OK;
22d6a1cb DM	73	}
22d6a1cb DM	74
446139a8 DM	75	static struct notifier_block sstate_reboot_notifier = {
	76	.notifier_call = sstate_reboot_call,
	77	};
	78
22d6a1cb DM	79	static int sstate_panic_event(struct notifier_block n, unsigned long event, void ptr)
22d6a1cb DM	80	{
5d0e7705	81	do_set_sstate(HV_SOFT_STATE_TRANSITION, panicking_msg);
22d6a1cb DM	82
	83	return NOTIFY_DONE;
	84	}
	85
	86	static struct notifier_block sstate_panic_block = {
	87	.notifier_call = sstate_panic_event,
	88	.priority = INT_MAX,
	89	};
	90
446139a8	91	static int __init sstate_init(void)
22d6a1cb DM	92	{
	93	unsigned long major, minor;
	94
446139a8 DM	95	if (tlb_type != hypervisor)
	96	return 0;
	97
22d6a1cb DM	98	major = 1;
	99	minor = 0;
	100	if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor))
446139a8	101	return 0;
22d6a1cb DM	102
	103	hv_supports_soft_state = 1;
	104
	105	prom_sun4v_guest_soft_state();
446139a8 DM	106
	107	do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg);
	108
22d6a1cb DM	109	atomic_notifier_chain_register(&panic_notifier_list,
22d6a1cb DM	110	&sstate_panic_block);
446139a8 DM	111	register_reboot_notifier(&sstate_reboot_notifier);
	112
	113	return 0;
22d6a1cb	114	}
446139a8 DM	115
	116	core_initcall(sstate_init);
	117
	118	static int __init sstate_running(void)
	119	{
	120	do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg);
	121	return 0;
	122	}
	123
	124	late_initcall(sstate_running);