rtas.c

linux-2.6.15.6

	spin_unlock_irqrestore(&rtas.lock, s);

	if (buff_copy) {
		log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
		if (mem_init_done)
			kfree(buff_copy);
	}
	return ret;
}

/* Given an RTAS status code of 990n compute the hinted delay of 10^n
 * (last digit) milliseconds.  For now we bound at n=5 (100 sec).
 */
unsigned int rtas_extended_busy_delay_time(int status)
{
	int order = status - 9900;
	unsigned long ms;

	if (order < 0)
		order = 0;	/* RTC depends on this for -2 clock busy */
	else if (order > 5)
		order = 5;	/* bound */

	/* Use microseconds for reasonable accuracy */
	for (ms = 1; order > 0; order--)
		ms *= 10;

	return ms; 
}

int rtas_error_rc(int rtas_rc)
{
	int rc;

	switch (rtas_rc) {
		case -1: 		/* Hardware Error */
			rc = -EIO;
			break;
		case -3:		/* Bad indicator/domain/etc */
			rc = -EINVAL;
			break;
		case -9000:		/* Isolation error */
			rc = -EFAULT;
			break;
		case -9001:		/* Outstanding TCE/PTE */
			rc = -EEXIST;
			break;
		case -9002:		/* No usable slot */
			rc = -ENODEV;
			break;
		default:
			printk(KERN_ERR "%s: unexpected RTAS error %d\n",
					__FUNCTION__, rtas_rc);
			rc = -ERANGE;
			break;
	}
	return rc;
}

int rtas_get_power_level(int powerdomain, int *level)
{
	int token = rtas_token("get-power-level");
	int rc;

	if (token == RTAS_UNKNOWN_SERVICE)
		return -ENOENT;

	while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
		udelay(1);

	if (rc < 0)
		return rtas_error_rc(rc);
	return rc;
}

int rtas_set_power_level(int powerdomain, int level, int *setlevel)
{
	int token = rtas_token("set-power-level");
	unsigned int wait_time;
	int rc;

	if (token == RTAS_UNKNOWN_SERVICE)
		return -ENOENT;

	while (1) {
		rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
		if (rc == RTAS_BUSY)
			udelay(1);
		else if (rtas_is_extended_busy(rc)) {
			wait_time = rtas_extended_busy_delay_time(rc);
			udelay(wait_time * 1000);
		} else
			break;
	}

	if (rc < 0)
		return rtas_error_rc(rc);
	return rc;
}

int rtas_get_sensor(int sensor, int index, int *state)
{
	int token = rtas_token("get-sensor-state");
	unsigned int wait_time;
	int rc;

	if (token == RTAS_UNKNOWN_SERVICE)
		return -ENOENT;

	while (1) {
		rc = rtas_call(token, 2, 2, state, sensor, index);
		if (rc == RTAS_BUSY)
			udelay(1);
		else if (rtas_is_extended_busy(rc)) {
			wait_time = rtas_extended_busy_delay_time(rc);
			udelay(wait_time * 1000);
		} else
			break;
	}

	if (rc < 0)
		return rtas_error_rc(rc);
	return rc;
}

int rtas_set_indicator(int indicator, int index, int new_value)
{
	int token = rtas_token("set-indicator");
	unsigned int wait_time;
	int rc;

	if (token == RTAS_UNKNOWN_SERVICE)
		return -ENOENT;

	while (1) {
		rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
		if (rc == RTAS_BUSY)
			udelay(1);
		else if (rtas_is_extended_busy(rc)) {
			wait_time = rtas_extended_busy_delay_time(rc);
			udelay(wait_time * 1000);
		}
		else
			break;
	}

	if (rc < 0)
		return rtas_error_rc(rc);
	return rc;
}

void rtas_restart(char *cmd)
{
	if (rtas_flash_term_hook)
		rtas_flash_term_hook(SYS_RESTART);
	printk("RTAS system-reboot returned %d\n",
	       rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
	for (;;);
}

void rtas_power_off(void)
{
	if (rtas_flash_term_hook)
		rtas_flash_term_hook(SYS_POWER_OFF);
	/* allow power on only with power button press */
	printk("RTAS power-off returned %d\n",
	       rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
	for (;;);
}

void rtas_halt(void)
{
	if (rtas_flash_term_hook)
		rtas_flash_term_hook(SYS_HALT);
	/* allow power on only with power button press */
	printk("RTAS power-off returned %d\n",
	       rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
	for (;;);
}

/* Must be in the RMO region, so we place it here */
static char rtas_os_term_buf[2048];

void rtas_os_term(char *str)
{
	int status;

	if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term"))
		return;

	snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);

	do {
		status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
				   __pa(rtas_os_term_buf));

		if (status == RTAS_BUSY)
			udelay(1);
		else if (status != 0)
			printk(KERN_EMERG "ibm,os-term call failed %d\n",
			       status);
	} while (status == RTAS_BUSY);
}


asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
{
	struct rtas_args args;
	unsigned long flags;
	char *buff_copy, *errbuf = NULL;
	int nargs;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
		return -EFAULT;

	nargs = args.nargs;
	if (nargs > ARRAY_SIZE(args.args)
	    || args.nret > ARRAY_SIZE(args.args)
	    || nargs + args.nret > ARRAY_SIZE(args.args))
		return -EINVAL;

	/* Copy in args. */
	if (copy_from_user(args.args, uargs->args,
			   nargs * sizeof(rtas_arg_t)) != 0)
		return -EFAULT;

	buff_copy = get_errorlog_buffer();

	spin_lock_irqsave(&rtas.lock, flags);

	rtas.args = args;
	enter_rtas(__pa(&rtas.args));
	args = rtas.args;

	args.rets = &args.args[nargs];

	/* A -1 return code indicates that the last command couldn't
	   be completed due to a hardware error. */
	if (args.rets[0] == -1)
		errbuf = __fetch_rtas_last_error(buff_copy);

	spin_unlock_irqrestore(&rtas.lock, flags);

	if (buff_copy) {
		if (errbuf)
			log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
		kfree(buff_copy);
	}

	/* Copy out args. */
	if (copy_to_user(uargs->args + nargs,
			 args.args + nargs,
			 args.nret * sizeof(rtas_arg_t)) != 0)
		return -EFAULT;

	return 0;
}

/* This version can't take the spinlock, because it never returns */

struct rtas_args rtas_stop_self_args = {
	/* The token is initialized for real in setup_system() */
	.token = RTAS_UNKNOWN_SERVICE,
	.nargs = 0,
	.nret = 1,
	.rets = &rtas_stop_self_args.args[0],
};

void rtas_stop_self(void)
{
	struct rtas_args *rtas_args = &rtas_stop_self_args;

	local_irq_disable();

	BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE);

	printk("cpu %u (hwid %u) Ready to die...\n",
	       smp_processor_id(), hard_smp_processor_id());
	enter_rtas(__pa(rtas_args));

	panic("Alas, I survived.\n");
}

/*
 * Call early during boot, before mem init or bootmem, to retreive the RTAS
 * informations from the device-tree and allocate the RMO buffer for userland
 * accesses.
 */
void __init rtas_initialize(void)
{
	unsigned long rtas_region = RTAS_INSTANTIATE_MAX;

	/* Get RTAS dev node and fill up our "rtas" structure with infos
	 * about it.
	 */
	rtas.dev = of_find_node_by_name(NULL, "rtas");
	if (rtas.dev) {
		u32 *basep, *entryp;
		u32 *sizep;

		basep = (u32 *)get_property(rtas.dev, "linux,rtas-base", NULL);
		sizep = (u32 *)get_property(rtas.dev, "rtas-size", NULL);
		if (basep != NULL && sizep != NULL) {
			rtas.base = *basep;
			rtas.size = *sizep;
			entryp = (u32 *)get_property(rtas.dev, "linux,rtas-entry", NULL);
			if (entryp == NULL) /* Ugh */
				rtas.entry = rtas.base;
			else
				rtas.entry = *entryp;
		} else
			rtas.dev = NULL;
	}
	if (!rtas.dev)
		return;

	/* If RTAS was found, allocate the RMO buffer for it and look for
	 * the stop-self token if any
	 */
#ifdef CONFIG_PPC64
	if (_machine == PLATFORM_PSERIES_LPAR)
		rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX);
#endif
	rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);

#ifdef CONFIG_HOTPLUG_CPU
	rtas_stop_self_args.token = rtas_token("stop-self");
#endif /* CONFIG_HOTPLUG_CPU */
#ifdef CONFIG_RTAS_ERROR_LOGGING
	rtas_last_error_token = rtas_token("rtas-last-error");
#endif
}


EXPORT_SYMBOL(rtas_token);
EXPORT_SYMBOL(rtas_call);
EXPORT_SYMBOL(rtas_data_buf);
EXPORT_SYMBOL(rtas_data_buf_lock);
EXPORT_SYMBOL(rtas_extended_busy_delay_time);
EXPORT_SYMBOL(rtas_get_sensor);
EXPORT_SYMBOL(rtas_get_power_level);
EXPORT_SYMBOL(rtas_set_power_level);
EXPORT_SYMBOL(rtas_set_indicator);