[deliverable/linux.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>

static int hv_supports_soft_state;

static unsigned long kimage_addr_to_ra(const char *p)
{
	unsigned long val = (unsigned long) p;

	return kern_base + (val - KERNBASE);
}

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 panicing_msg[32] __attribute__((aligned(32))) =
	"Linux panicing";

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, panicing_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
	17	static int hv_supports_soft_state;
	18
	19	static unsigned long kimage_addr_to_ra(const char *p)
	20	{
	21	unsigned long val = (unsigned long) p;
	22
	23	return kern_base + (val - KERNBASE);
	24	}
	25
	26	static void do_set_sstate(unsigned long state, const char *msg)
	27	{
	28	unsigned long err;
	29
	30	if (!hv_supports_soft_state)
	31	return;
	32
	33	err = sun4v_mach_set_soft_state(state, kimage_addr_to_ra(msg));
	34	if (err) {
	35	printk(KERN_WARNING "SSTATE: Failed to set soft-state to "
	36	"state[%lx] msg[%s], err=%lu\n",
	37	state, msg, err);
	38	}
	39	}
	40
	41	static const char booting_msg[32] __attribute__((aligned(32))) =
	42	"Linux booting";
	43	static const char running_msg[32] __attribute__((aligned(32))) =
	44	"Linux running";
	45	static const char halting_msg[32] __attribute__((aligned(32))) =
	46	"Linux halting";
	47	static const char poweroff_msg[32] __attribute__((aligned(32))) =
	48	"Linux powering off";
	49	static const char rebooting_msg[32] __attribute__((aligned(32))) =
	50	"Linux rebooting";
	51	static const char panicing_msg[32] __attribute__((aligned(32))) =
	52	"Linux panicing";
	53
446139a8	54	static int sstate_reboot_call(struct notifier_block np, unsigned long type, void _unused)
22d6a1cb	55	{
446139a8	56	const char *msg;
22d6a1cb	57
446139a8 DM	58	switch (type) {
	59	case SYS_DOWN:
	60	default:
	61	msg = rebooting_msg;
	62	break;
22d6a1cb	63
446139a8 DM	64	case SYS_HALT:
	65	msg = halting_msg;
	66	break;
22d6a1cb	67
446139a8 DM	68	case SYS_POWER_OFF:
	69	msg = poweroff_msg;
	70	break;
	71	}
22d6a1cb	72
446139a8 DM	73	do_set_sstate(HV_SOFT_STATE_TRANSITION, msg);
	74
	75	return NOTIFY_OK;
22d6a1cb DM	76	}
22d6a1cb DM	77
446139a8 DM	78	static struct notifier_block sstate_reboot_notifier = {
	79	.notifier_call = sstate_reboot_call,
	80	};
	81
22d6a1cb DM	82	static int sstate_panic_event(struct notifier_block n, unsigned long event, void ptr)
	83	{
	84	do_set_sstate(HV_SOFT_STATE_TRANSITION, panicing_msg);
	85
	86	return NOTIFY_DONE;
	87	}
	88
	89	static struct notifier_block sstate_panic_block = {
	90	.notifier_call = sstate_panic_event,
	91	.priority = INT_MAX,
	92	};
	93
446139a8	94	static int __init sstate_init(void)
22d6a1cb DM	95	{
	96	unsigned long major, minor;
	97
446139a8 DM	98	if (tlb_type != hypervisor)
	99	return 0;
	100
22d6a1cb DM	101	major = 1;
	102	minor = 0;
	103	if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor))
446139a8	104	return 0;
22d6a1cb DM	105
	106	hv_supports_soft_state = 1;
	107
	108	prom_sun4v_guest_soft_state();
446139a8 DM	109
	110	do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg);
	111
22d6a1cb DM	112	atomic_notifier_chain_register(&panic_notifier_list,
22d6a1cb DM	113	&sstate_panic_block);
446139a8 DM	114	register_reboot_notifier(&sstate_reboot_notifier);
	115
	116	return 0;
22d6a1cb	117	}
446139a8 DM	118
	119	core_initcall(sstate_init);
	120
	121	static int __init sstate_running(void)
	122	{
	123	do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg);
	124	return 0;
	125	}
	126
	127	late_initcall(sstate_running);