[mirror_ubuntu-artful-kernel.git] / arch / sparc / kernel / sstate.c

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