Release 4.14 arch/powerpc/kernel/rtas.c

/*
 *
 * Procedures for interfacing to the RTAS on CHRP machines.
 *
 * Peter Bergner, IBM   March 2001.
 * Copyright (C) 2001 IBM.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <stdarg.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/delay.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/completion.h>
#include <linux/cpumask.h>
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/reboot.h>

#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/hvcall.h>
#include <asm/machdep.h>
#include <asm/firmware.h>
#include <asm/page.h>
#include <asm/param.h>
#include <asm/delay.h>
#include <linux/uaccess.h>
#include <asm/udbg.h>
#include <asm/syscalls.h>
#include <asm/smp.h>
#include <linux/atomic.h>
#include <asm/time.h>
#include <asm/mmu.h>
#include <asm/topology.h>

/* This is here deliberately so it's only used in this file */
void enter_rtas(unsigned long);


struct rtas_t rtas = {
	.lock = __ARCH_SPIN_LOCK_UNLOCKED
};

EXPORT_SYMBOL(rtas);


DEFINE_SPINLOCK(rtas_data_buf_lock);

EXPORT_SYMBOL(rtas_data_buf_lock);


char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;

EXPORT_SYMBOL(rtas_data_buf);


unsigned long rtas_rmo_buf;

/*
 * If non-NULL, this gets called when the kernel terminates.
 * This is done like this so rtas_flash can be a module.
 */

void (*rtas_flash_term_hook)(int);

EXPORT_SYMBOL(rtas_flash_term_hook);

/* RTAS use home made raw locking instead of spin_lock_irqsave
 * because those can be called from within really nasty contexts
 * such as having the timebase stopped which would lockup with
 * normal locks and spinlock debugging enabled
 */


static unsigned long lock_rtas(void)
{
	unsigned long flags;

	local_irq_save(flags);
	preempt_disable();
	arch_spin_lock_flags(&rtas.lock, flags);
	return flags;
}

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static void unlock_rtas(unsigned long flags)
{
	arch_spin_unlock(&rtas.lock);
	local_irq_restore(flags);
	preempt_enable();
}

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/*
 * call_rtas_display_status and call_rtas_display_status_delay
 * are designed only for very early low-level debugging, which
 * is why the token is hard-coded to 10.
 */


static void call_rtas_display_status(unsigned char c)
{
	unsigned long s;

	if (!rtas.base)
		return;

	s = lock_rtas();
	rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);
	unlock_rtas(s);
}

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static void call_rtas_display_status_delay(char c)
{
	static int pending_newline = 0;  /* did last write end with unprinted newline? */
	static int width = 16;

	if (c == '\n') {	
		while (width-- > 0)
			call_rtas_display_status(' ');
		width = 16;
		mdelay(500);
		pending_newline = 1;
	} else {
		if (pending_newline) {
			call_rtas_display_status('\r');
			call_rtas_display_status('\n');
		} 
		pending_newline = 0;
		if (width--) {
			call_rtas_display_status(c);
			udelay(10000);
		}
	}
}

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void __init udbg_init_rtas_panel(void)
{
	udbg_putc = call_rtas_display_status_delay;
}

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#ifdef CONFIG_UDBG_RTAS_CONSOLE

/* If you think you're dying before early_init_dt_scan_rtas() does its
 * work, you can hard code the token values for your firmware here and
 * hardcode rtas.base/entry etc.
 */

static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;

static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;



static void udbg_rtascon_putc(char c)
{
	int tries;

	if (!rtas.base)
		return;

	/* Add CRs before LFs */
	if (c == '\n')
		udbg_rtascon_putc('\r');

	/* if there is more than one character to be displayed, wait a bit */
	for (tries = 0; tries < 16; tries++) {
		if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
			break;
		udelay(1000);
	}
}

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static int udbg_rtascon_getc_poll(void)
{
	int c;

	if (!rtas.base)
		return -1;

	if (rtas_call(rtas_getchar_token, 0, 2, &c))
		return -1;

	return c;
}

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static int udbg_rtascon_getc(void)
{
	int c;

	while ((c = udbg_rtascon_getc_poll()) == -1)
		;

	return c;
}


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void __init udbg_init_rtas_console(void)
{
	udbg_putc = udbg_rtascon_putc;
	udbg_getc = udbg_rtascon_getc;
	udbg_getc_poll = udbg_rtascon_getc_poll;
}
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#endif /* CONFIG_UDBG_RTAS_CONSOLE */



void rtas_progress(char *s, unsigned short hex)
{
	struct device_node *root;
	int width;
	const __be32 *p;
	char *os;
	static int display_character, set_indicator;
	static int display_width, display_lines, form_feed;
	static const int *row_width;
	static DEFINE_SPINLOCK(progress_lock);
	static int current_line;
	static int pending_newline = 0;  /* did last write end with unprinted newline? */

	if (!rtas.base)
		return;

	if (display_width == 0) {
		display_width = 0x10;
		if ((root = of_find_node_by_path("/rtas"))) {
			if ((p = of_get_property(root,
					"ibm,display-line-length", NULL)))
				display_width = be32_to_cpu(*p);
			if ((p = of_get_property(root,
					"ibm,form-feed", NULL)))
				form_feed = be32_to_cpu(*p);
			if ((p = of_get_property(root,
					"ibm,display-number-of-lines", NULL)))
				display_lines = be32_to_cpu(*p);
			row_width = of_get_property(root,
					"ibm,display-truncation-length", NULL);
			of_node_put(root);
		}
		display_character = rtas_token("display-character");
		set_indicator = rtas_token("set-indicator");
	}

	if (display_character == RTAS_UNKNOWN_SERVICE) {
		/* use hex display if available */
		if (set_indicator != RTAS_UNKNOWN_SERVICE)
			rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
		return;
	}

	spin_lock(&progress_lock);

	/*
         * Last write ended with newline, but we didn't print it since
         * it would just clear the bottom line of output. Print it now
         * instead.
         *
         * If no newline is pending and form feed is supported, clear the
         * display with a form feed; otherwise, print a CR to start output
         * at the beginning of the line.
         */
	if (pending_newline) {
		rtas_call(display_character, 1, 1, NULL, '\r');
		rtas_call(display_character, 1, 1, NULL, '\n');
		pending_newline = 0;
	} else {
		current_line = 0;
		if (form_feed)
			rtas_call(display_character, 1, 1, NULL,
				  (char)form_feed);
		else
			rtas_call(display_character, 1, 1, NULL, '\r');
	}
 
	if (row_width)
		width = row_width[current_line];
	else
		width = display_width;
	os = s;
	while (*os) {
		if (*os == '\n' || *os == '\r') {
			/* If newline is the last character, save it
                         * until next call to avoid bumping up the
                         * display output.
                         */
			if (*os == '\n' && !os[1]) {
				pending_newline = 1;
				current_line++;
				if (current_line > display_lines-1)
					current_line = display_lines-1;
				spin_unlock(&progress_lock);
				return;
			}
 
			/* RTAS wants CR-LF, not just LF */
 
			if (*os == '\n') {
				rtas_call(display_character, 1, 1, NULL, '\r');
				rtas_call(display_character, 1, 1, NULL, '\n');
			} else {
				/* CR might be used to re-draw a line, so we'll
                                 * leave it alone and not add LF.
                                 */
				rtas_call(display_character, 1, 1, NULL, *os);
			}
 
			if (row_width)
				width = row_width[current_line];
			else
				width = display_width;
		} else {
			width--;
			rtas_call(display_character, 1, 1, NULL, *os);
		}
 
		os++;
 
		/* if we overwrite the screen length */
		if (width <= 0)
			while ((*os != 0) && (*os != '\n') && (*os != '\r'))
				os++;
	}
 
	spin_unlock(&progress_lock);
}
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EXPORT_SYMBOL(rtas_progress);		
/* needed by rtas_flash module */



int rtas_token(const char *service)
{
	const __be32 *tokp;
	if (rtas.dev == NULL)
		return RTAS_UNKNOWN_SERVICE;
	tokp = of_get_property(rtas.dev, service, NULL);
	return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE;
}
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EXPORT_SYMBOL(rtas_token);



int rtas_service_present(const char *service)
{
	return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
}
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EXPORT_SYMBOL(rtas_service_present);

#ifdef CONFIG_RTAS_ERROR_LOGGING
/*
 * Return the firmware-specified size of the error log buffer
 *  for all rtas calls that require an error buffer argument.
 *  This includes 'check-exception' and 'rtas-last-error'.
 */


int rtas_get_error_log_max(void)
{
	static int rtas_error_log_max;
	if (rtas_error_log_max)
		return rtas_error_log_max;

	rtas_error_log_max = rtas_token ("rtas-error-log-max");
	if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
	    (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
		printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
			rtas_error_log_max);
		rtas_error_log_max = RTAS_ERROR_LOG_MAX;
	}
	return rtas_error_log_max;
}
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EXPORT_SYMBOL(rtas_get_error_log_max);



static char rtas_err_buf[RTAS_ERROR_LOG_MAX];

static int rtas_last_error_token;

/** Return a copy of the detailed error text associated with the
 *  most recent failed call to rtas.  Because the error text
 *  might go stale if there are any other intervening rtas calls,
 *  this routine must be called atomically with whatever produced
 *  the error (i.e. with rtas.lock still held from the previous call).
 */


static char *__fetch_rtas_last_error(char *altbuf)
{
	struct rtas_args err_args, save_args;
	u32 bufsz;
	char *buf = NULL;

	if (rtas_last_error_token == -1)
		return NULL;

	bufsz = rtas_get_error_log_max();

	err_args.token = cpu_to_be32(rtas_last_error_token);
	err_args.nargs = cpu_to_be32(2);
	err_args.nret = cpu_to_be32(1);
	err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf));
	err_args.args[1] = cpu_to_be32(bufsz);
	err_args.args[2] = 0;

	save_args = rtas.args;
	rtas.args = err_args;

	enter_rtas(__pa(&rtas.args));

	err_args = rtas.args;
	rtas.args = save_args;

	/* Log the error in the unlikely case that there was one. */
	if (unlikely(err_args.args[2] == 0)) {
		if (altbuf) {
			buf = altbuf;
		} else {
			buf = rtas_err_buf;
			if (slab_is_available())
				buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
		}
		if (buf)
			memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
	}

	return buf;
}

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#define get_errorlog_buffer()	kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)

#else /* CONFIG_RTAS_ERROR_LOGGING */

#define __fetch_rtas_last_error(x)	NULL

#define get_errorlog_buffer()		NULL
#endif



static void

va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret,
		      va_list list)
{
	int i;

	args->token = cpu_to_be32(token);
	args->nargs = cpu_to_be32(nargs);
	args->nret  = cpu_to_be32(nret);
	args->rets  = &(args->args[nargs]);

	for (i = 0; i < nargs; ++i)
		args->args[i] = cpu_to_be32(va_arg(list, __u32));

	for (i = 0; i < nret; ++i)
		args->rets[i] = 0;

	enter_rtas(__pa(args));
}

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void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...)
{
	va_list list;

	va_start(list, nret);
	va_rtas_call_unlocked(args, token, nargs, nret, list);
	va_end(list);
}

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int rtas_call(int token, int nargs, int nret, int *outputs, ...)
{
	va_list list;
	int i;
	unsigned long s;
	struct rtas_args *rtas_args;
	char *buff_copy = NULL;
	int ret;

	if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
		return -1;

	s = lock_rtas();

	/* We use the global rtas args buffer */
	rtas_args = &rtas.args;

	va_start(list, outputs);
	va_rtas_call_unlocked(rtas_args, token, nargs, nret, list);
	va_end(list);

	/* A -1 return code indicates that the last command couldn't
           be completed due to a hardware error. */
	if (be32_to_cpu(rtas_args->rets[0]) == -1)
		buff_copy = __fetch_rtas_last_error(NULL);

	if (nret > 1 && outputs != NULL)
		for (i = 0; i < nret-1; ++i)
			outputs[i] = be32_to_cpu(rtas_args->rets[i+1]);
	ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0;

	unlock_rtas(s);

	if (buff_copy) {
		log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
		if (slab_is_available())
			kfree(buff_copy);
	}
	return ret;
}
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EXPORT_SYMBOL(rtas_call);

/* For RTAS_BUSY (-2), delay for 1 millisecond.  For an extended busy status
 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
 */


unsigned int rtas_busy_delay_time(int status)
{
	int order;
	unsigned int ms = 0;

	if (status == RTAS_BUSY) {
		ms = 1;
	} else if (status >= RTAS_EXTENDED_DELAY_MIN &&
		   status <= RTAS_EXTENDED_DELAY_MAX) {
		order = status - RTAS_EXTENDED_DELAY_MIN;
		for (ms = 1; order > 0; order--)
			ms *= 10;
	}

	return ms;
}
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EXPORT_SYMBOL(rtas_busy_delay_time);

/* For an RTAS busy status code, perform the hinted delay. */


unsigned int rtas_busy_delay(int status)
{
	unsigned int ms;

	might_sleep();
	ms = rtas_busy_delay_time(status);
	if (ms && need_resched())
		msleep(ms);

	return ms;
}
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EXPORT_SYMBOL(rtas_busy_delay);



static 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",
					__func__, rtas_rc);
			rc = -ERANGE;
			break;
	}
	return rc;
}

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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;
}
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EXPORT_SYMBOL(rtas_get_power_level);



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

	if (token == RTAS_UNKNOWN_SERVICE)
		return -ENOENT;

	do {
		rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
	} while (rtas_busy_delay(rc));

	if (rc < 0)
		return rtas_error_rc(rc);
	return rc;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
58
73.42%
1
25.00%
Paul Mackerras
16
20.25%
2
50.00%
John Rose
5
6.33%
1
25.00%
Total
79
100.00%
4
100.00%


EXPORT_SYMBOL(rtas_set_power_level);



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

	if (token == RTAS_UNKNOWN_SERVICE)
		return -ENOENT;

	do {
		rc = rtas_call(token, 2, 2, state, sensor, index);
	} while (rtas_busy_delay(rc));

	if (rc < 0)
		return rtas_error_rc(rc);
	return rc;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
58
73.42%
1
25.00%
Paul Mackerras
16
20.25%
2
50.00%
John Rose
5
6.33%
1
25.00%
Total
79
100.00%
4
100.00%


EXPORT_SYMBOL(rtas_get_sensor);



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

	if (token == RTAS_UNKNOWN_SERVICE)
		return -ENOENT;

	rc = rtas_call(token, 2, 2, state, sensor, index);
	WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
				    rc <= RTAS_EXTENDED_DELAY_MAX));

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Huth
85
100.00%
1
100.00%
Total
85
100.00%
1
100.00%



bool rtas_indicator_present(int token, int *maxindex)
{
	int proplen, count, i;
	const struct indicator_elem {
		__be32 token;
		__be32 maxindex;
	} *indicators;

	indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
	if (!indicators)
		return false;

	count = proplen / sizeof(struct indicator_elem);

	for (i = 0; i < count; i++) {
		if (__be32_to_cpu(indicators[i].token) != token)
			continue;
		if (maxindex)
			*maxindex = __be32_to_cpu(indicators[i].maxindex);
		return true;
	}

	return false;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Nathan T. Lynch
110
93.22%
1
50.00%
Anton Blanchard
8
6.78%
1
50.00%
Total
118
100.00%
2
100.00%


EXPORT_SYMBOL(rtas_indicator_present);



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

	if (token == RTAS_UNKNOWN_SERVICE)
		return -ENOENT;

	do {
		rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
	} while (rtas_busy_delay(rc));

	if (rc < 0)
		return rtas_error_rc(rc);
	return rc;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
60
75.00%
1
33.33%
Paul Mackerras
15
18.75%
1
33.33%
John Rose
5
6.25%
1
33.33%
Total
80
100.00%
3
100.00%


EXPORT_SYMBOL(rtas_set_indicator);

/*
 * Ignoring RTAS extended delay
 */


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

	if (token == RTAS_UNKNOWN_SERVICE)
		return -ENOENT;

	rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);

	WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
				    rc <= RTAS_EXTENDED_DELAY_MAX));

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

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Haren Myneni
83
96.51%
1
50.00%
Thomas Huth
3
3.49%
1
50.00%
Total
86
100.00%
2
100.00%



void __noreturn 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 (;;);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Anton Blanchard
32
72.73%
1
20.00%
Paul Mackerras
11
25.00%
3
60.00%
Daniel Axtens
1
2.27%
1
20.00%
Total
44
100.00%
5
100.00%



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 (;;);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Anton Blanchard
33
68.75%
1
25.00%
Paul Mackerras
15
31.25%
3
75.00%
Total
48
100.00%
4
100.00%



void __noreturn 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 (;;);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mackerras
41
83.67%
2
50.00%
Anton Blanchard
7
14.29%
1
25.00%
Daniel Axtens
1
2.04%
1
25.00%
Total
49
100.00%
4
100.00%

/* 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;

	/*
         * Firmware with the ibm,extended-os-term property is guaranteed
         * to always return from an ibm,os-term call. Earlier versions without
         * this property may terminate the partition which we want to avoid
         * since it interferes with panic_timeout.
         */
	if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
	    RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
		return;

	snprintf(rtas_os_term_buf, 2048, "OS panic: %s"