Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1419 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
new file mode 100644
index 000000000..362c20c8c
--- /dev/null
+++ b/arch/powerpc/kernel/rtas.c
@@ -0,0 +1,1419 @@
+/*
+ *
+ * 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 <linux/syscalls.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(&rtas.lock);
+	return flags;
+}
+
+static void unlock_rtas(unsigned long flags)
+{
+	arch_spin_unlock(&rtas.lock);
+	local_irq_restore(flags);
+	preempt_enable();
+}
+
+/*
+ * 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);
+}
+
+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);
+		}
+	}
+}
+
+void __init udbg_init_rtas_panel(void)
+{
+	udbg_putc = call_rtas_display_status_delay;
+}
+
+#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);
+	}
+}
+
+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;
+}
+
+static int udbg_rtascon_getc(void)
+{
+	int c;
+
+	while ((c = udbg_rtascon_getc_poll()) == -1)
+		;
+
+	return c;
+}
+
+
+void __init udbg_init_rtas_console(void)
+{
+	udbg_putc = udbg_rtascon_putc;
+	udbg_getc = udbg_rtascon_getc;
+	udbg_getc_poll = udbg_rtascon_getc_poll;
+}
+#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);
+}
+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;
+}
+EXPORT_SYMBOL(rtas_token);
+
+int rtas_service_present(const char *service)
+{
+	return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
+}
+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;
+}
+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;
+}
+
+#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));
+}
+
+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);
+}
+
+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;
+}
+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;
+}
+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;
+}
+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;
+}
+
+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;
+}
+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;
+}
+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;
+}
+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;
+}
+
+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;
+}
+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;
+}
+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;
+}
+
+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 (;;);
+}
+
+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 __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 (;;);
+}
+
+/* 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", str);
+
+	do {
+		status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
+				   __pa(rtas_os_term_buf));
+	} while (rtas_busy_delay(status));
+
+	if (status != 0)
+		printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
+}
+
+static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
+#ifdef CONFIG_PPC_PSERIES
+static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
+{
+	u16 slb_size = mmu_slb_size;
+	int rc = H_MULTI_THREADS_ACTIVE;
+	int cpu;
+
+	slb_set_size(SLB_MIN_SIZE);
+	printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
+
+	while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
+	       !atomic_read(&data->error))
+		rc = rtas_call(data->token, 0, 1, NULL);
+
+	if (rc || atomic_read(&data->error)) {
+		printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
+		slb_set_size(slb_size);
+	}
+
+	if (atomic_read(&data->error))
+		rc = atomic_read(&data->error);
+
+	atomic_set(&data->error, rc);
+	pSeries_coalesce_init();
+
+	if (wake_when_done) {
+		atomic_set(&data->done, 1);
+
+		for_each_online_cpu(cpu)
+			plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
+	}
+
+	if (atomic_dec_return(&data->working) == 0)
+		complete(data->complete);
+
+	return rc;
+}
+
+int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
+{
+	atomic_inc(&data->working);
+	return __rtas_suspend_last_cpu(data, 0);
+}
+
+static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
+{
+	long rc = H_SUCCESS;
+	unsigned long msr_save;
+	int cpu;
+
+	atomic_inc(&data->working);
+
+	/* really need to ensure MSR.EE is off for H_JOIN */
+	msr_save = mfmsr();
+	mtmsr(msr_save & ~(MSR_EE));
+
+	while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
+		rc = plpar_hcall_norets(H_JOIN);
+
+	mtmsr(msr_save);
+
+	if (rc == H_SUCCESS) {
+		/* This cpu was prodded and the suspend is complete. */
+		goto out;
+	} else if (rc == H_CONTINUE) {
+		/* All other cpus are in H_JOIN, this cpu does
+		 * the suspend.
+		 */
+		return __rtas_suspend_last_cpu(data, wake_when_done);
+	} else {
+		printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
+		       smp_processor_id(), rc);
+		atomic_set(&data->error, rc);
+	}
+
+	if (wake_when_done) {
+		atomic_set(&data->done, 1);
+
+		/* This cpu did the suspend or got an error; in either case,
+		 * we need to prod all other other cpus out of join state.
+		 * Extra prods are harmless.
+		 */
+		for_each_online_cpu(cpu)
+			plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
+	}
+out:
+	if (atomic_dec_return(&data->working) == 0)
+		complete(data->complete);
+	return rc;
+}
+
+int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
+{
+	return __rtas_suspend_cpu(data, 0);
+}
+
+static void rtas_percpu_suspend_me(void *info)
+{
+	__rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
+}
+
+enum rtas_cpu_state {
+	DOWN,
+	UP,
+};
+
+#ifndef CONFIG_SMP
+static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
+				cpumask_var_t cpus)
+{
+	if (!cpumask_empty(cpus)) {
+		cpumask_clear(cpus);
+		return -EINVAL;
+	} else
+		return 0;
+}
+#else
+/* On return cpumask will be altered to indicate CPUs changed.
+ * CPUs with states changed will be set in the mask,
+ * CPUs with status unchanged will be unset in the mask. */
+static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
+				cpumask_var_t cpus)
+{
+	int cpu;
+	int cpuret = 0;
+	int ret = 0;
+
+	if (cpumask_empty(cpus))
+		return 0;
+
+	for_each_cpu(cpu, cpus) {
+		struct device *dev = get_cpu_device(cpu);
+
+		switch (state) {
+		case DOWN:
+			cpuret = device_offline(dev);
+			break;
+		case UP:
+			cpuret = device_online(dev);
+			break;
+		}
+		if (cpuret < 0) {
+			pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
+					__func__,
+					((state == UP) ? "up" : "down"),
+					cpu, cpuret);
+			if (!ret)
+				ret = cpuret;
+			if (state == UP) {
+				/* clear bits for unchanged cpus, return */
+				cpumask_shift_right(cpus, cpus, cpu);
+				cpumask_shift_left(cpus, cpus, cpu);
+				break;
+			} else {
+				/* clear bit for unchanged cpu, continue */
+				cpumask_clear_cpu(cpu, cpus);
+			}
+		}
+	}
+
+	return ret;
+}
+#endif
+
+int rtas_online_cpus_mask(cpumask_var_t cpus)
+{
+	int ret;
+
+	ret = rtas_cpu_state_change_mask(UP, cpus);
+
+	if (ret) {
+		cpumask_var_t tmp_mask;
+
+		if (!alloc_cpumask_var(&tmp_mask, GFP_KERNEL))
+			return ret;
+
+		/* Use tmp_mask to preserve cpus mask from first failure */
+		cpumask_copy(tmp_mask, cpus);
+		rtas_offline_cpus_mask(tmp_mask);
+		free_cpumask_var(tmp_mask);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL(rtas_online_cpus_mask);
+
+int rtas_offline_cpus_mask(cpumask_var_t cpus)
+{
+	return rtas_cpu_state_change_mask(DOWN, cpus);
+}
+EXPORT_SYMBOL(rtas_offline_cpus_mask);
+
+int rtas_ibm_suspend_me(u64 handle)
+{
+	long state;
+	long rc;
+	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+	struct rtas_suspend_me_data data;
+	DECLARE_COMPLETION_ONSTACK(done);
+	cpumask_var_t offline_mask;
+	int cpuret;
+
+	if (!rtas_service_present("ibm,suspend-me"))
+		return -ENOSYS;
+
+	/* Make sure the state is valid */
+	rc = plpar_hcall(H_VASI_STATE, retbuf, handle);
+
+	state = retbuf[0];
+
+	if (rc) {
+		printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
+		return rc;
+	} else if (state == H_VASI_ENABLED) {
+		return -EAGAIN;
+	} else if (state != H_VASI_SUSPENDING) {
+		printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
+		       state);
+		return -EIO;
+	}
+
+	if (!alloc_cpumask_var(&offline_mask, GFP_KERNEL))
+		return -ENOMEM;
+
+	atomic_set(&data.working, 0);
+	atomic_set(&data.done, 0);
+	atomic_set(&data.error, 0);
+	data.token = rtas_token("ibm,suspend-me");
+	data.complete = &done;
+
+	lock_device_hotplug();
+
+	/* All present CPUs must be online */
+	cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask);
+	cpuret = rtas_online_cpus_mask(offline_mask);
+	if (cpuret) {
+		pr_err("%s: Could not bring present CPUs online.\n", __func__);
+		atomic_set(&data.error, cpuret);
+		goto out;
+	}
+
+	cpu_hotplug_disable();
+	stop_topology_update();
+
+	/* Call function on all CPUs.  One of us will make the
+	 * rtas call
+	 */
+	if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
+		atomic_set(&data.error, -EINVAL);
+
+	wait_for_completion(&done);
+
+	if (atomic_read(&data.error) != 0)
+		printk(KERN_ERR "Error doing global join\n");
+
+	start_topology_update();
+	cpu_hotplug_enable();
+
+	/* Take down CPUs not online prior to suspend */
+	cpuret = rtas_offline_cpus_mask(offline_mask);
+	if (cpuret)
+		pr_warn("%s: Could not restore CPUs to offline state.\n",
+				__func__);
+
+out:
+	unlock_device_hotplug();
+	free_cpumask_var(offline_mask);
+	return atomic_read(&data.error);
+}
+#else /* CONFIG_PPC_PSERIES */
+int rtas_ibm_suspend_me(u64 handle)
+{
+	return -ENOSYS;
+}
+#endif
+
+/**
+ * Find a specific pseries error log in an RTAS extended event log.
+ * @log: RTAS error/event log
+ * @section_id: two character section identifier
+ *
+ * Returns a pointer to the specified errorlog or NULL if not found.
+ */
+struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
+					      uint16_t section_id)
+{
+	struct rtas_ext_event_log_v6 *ext_log =
+		(struct rtas_ext_event_log_v6 *)log->buffer;
+	struct pseries_errorlog *sect;
+	unsigned char *p, *log_end;
+	uint32_t ext_log_length = rtas_error_extended_log_length(log);
+	uint8_t log_format = rtas_ext_event_log_format(ext_log);
+	uint32_t company_id = rtas_ext_event_company_id(ext_log);
+
+	/* Check that we understand the format */
+	if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) ||
+	    log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
+	    company_id != RTAS_V6EXT_COMPANY_ID_IBM)
+		return NULL;
+
+	log_end = log->buffer + ext_log_length;
+	p = ext_log->vendor_log;
+
+	while (p < log_end) {
+		sect = (struct pseries_errorlog *)p;
+		if (pseries_errorlog_id(sect) == section_id)
+			return sect;
+		p += pseries_errorlog_length(sect);
+	}
+
+	return NULL;
+}
+
+#ifdef CONFIG_PPC_RTAS_FILTER
+
+/*
+ * The sys_rtas syscall, as originally designed, allows root to pass
+ * arbitrary physical addresses to RTAS calls. A number of RTAS calls
+ * can be abused to write to arbitrary memory and do other things that
+ * are potentially harmful to system integrity, and thus should only
+ * be used inside the kernel and not exposed to userspace.
+ *
+ * All known legitimate users of the sys_rtas syscall will only ever
+ * pass addresses that fall within the RMO buffer, and use a known
+ * subset of RTAS calls.
+ *
+ * Accordingly, we filter RTAS requests to check that the call is
+ * permitted, and that provided pointers fall within the RMO buffer.
+ * The rtas_filters list contains an entry for each permitted call,
+ * with the indexes of the parameters which are expected to contain
+ * addresses and sizes of buffers allocated inside the RMO buffer.
+ */
+struct rtas_filter {
+	const char *name;
+	int token;
+	/* Indexes into the args buffer, -1 if not used */
+	int buf_idx1;
+	int size_idx1;
+	int buf_idx2;
+	int size_idx2;
+
+	int fixed_size;
+};
+
+static struct rtas_filter rtas_filters[] __ro_after_init = {
+	{ "ibm,activate-firmware", -1, -1, -1, -1, -1 },
+	{ "ibm,configure-connector", -1, 0, -1, 1, -1, 4096 },	/* Special cased */
+	{ "display-character", -1, -1, -1, -1, -1 },
+	{ "ibm,display-message", -1, 0, -1, -1, -1 },
+	{ "ibm,errinjct", -1, 2, -1, -1, -1, 1024 },
+	{ "ibm,close-errinjct", -1, -1, -1, -1, -1 },
+	{ "ibm,open-errinjct", -1, -1, -1, -1, -1 },
+	{ "ibm,get-config-addr-info2", -1, -1, -1, -1, -1 },
+	{ "ibm,get-dynamic-sensor-state", -1, 1, -1, -1, -1 },
+	{ "ibm,get-indices", -1, 2, 3, -1, -1 },
+	{ "get-power-level", -1, -1, -1, -1, -1 },
+	{ "get-sensor-state", -1, -1, -1, -1, -1 },
+	{ "ibm,get-system-parameter", -1, 1, 2, -1, -1 },
+	{ "get-time-of-day", -1, -1, -1, -1, -1 },
+	{ "ibm,get-vpd", -1, 0, -1, 1, 2 },
+	{ "ibm,lpar-perftools", -1, 2, 3, -1, -1 },
+	{ "ibm,platform-dump", -1, 4, 5, -1, -1 },
+	{ "ibm,read-slot-reset-state", -1, -1, -1, -1, -1 },
+	{ "ibm,scan-log-dump", -1, 0, 1, -1, -1 },
+	{ "ibm,set-dynamic-indicator", -1, 2, -1, -1, -1 },
+	{ "ibm,set-eeh-option", -1, -1, -1, -1, -1 },
+	{ "set-indicator", -1, -1, -1, -1, -1 },
+	{ "set-power-level", -1, -1, -1, -1, -1 },
+	{ "set-time-for-power-on", -1, -1, -1, -1, -1 },
+	{ "ibm,set-system-parameter", -1, 1, -1, -1, -1 },
+	{ "set-time-of-day", -1, -1, -1, -1, -1 },
+	{ "ibm,suspend-me", -1, -1, -1, -1, -1 },
+	{ "ibm,update-nodes", -1, 0, -1, -1, -1, 4096 },
+	{ "ibm,update-properties", -1, 0, -1, -1, -1, 4096 },
+	{ "ibm,physical-attestation", -1, 0, 1, -1, -1 },
+};
+
+static bool in_rmo_buf(u32 base, u32 end)
+{
+	return base >= rtas_rmo_buf &&
+		base < (rtas_rmo_buf + RTAS_RMOBUF_MAX) &&
+		base <= end &&
+		end >= rtas_rmo_buf &&
+		end < (rtas_rmo_buf + RTAS_RMOBUF_MAX);
+}
+
+static bool block_rtas_call(int token, int nargs,
+			    struct rtas_args *args)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(rtas_filters); i++) {
+		struct rtas_filter *f = &rtas_filters[i];
+		u32 base, size, end;
+
+		if (token != f->token)
+			continue;
+
+		if (f->buf_idx1 != -1) {
+			base = be32_to_cpu(args->args[f->buf_idx1]);
+			if (f->size_idx1 != -1)
+				size = be32_to_cpu(args->args[f->size_idx1]);
+			else if (f->fixed_size)
+				size = f->fixed_size;
+			else
+				size = 1;
+
+			end = base + size - 1;
+			if (!in_rmo_buf(base, end))
+				goto err;
+		}
+
+		if (f->buf_idx2 != -1) {
+			base = be32_to_cpu(args->args[f->buf_idx2]);
+			if (f->size_idx2 != -1)
+				size = be32_to_cpu(args->args[f->size_idx2]);
+			else if (f->fixed_size)
+				size = f->fixed_size;
+			else
+				size = 1;
+			end = base + size - 1;
+
+			/*
+			 * Special case for ibm,configure-connector where the
+			 * address can be 0
+			 */
+			if (!strcmp(f->name, "ibm,configure-connector") &&
+			    base == 0)
+				return false;
+
+			if (!in_rmo_buf(base, end))
+				goto err;
+		}
+
+		return false;
+	}
+
+err:
+	pr_err_ratelimited("sys_rtas: RTAS call blocked - exploit attempt?\n");
+	pr_err_ratelimited("sys_rtas: token=0x%x, nargs=%d (called by %s)\n",
+			   token, nargs, current->comm);
+	return true;
+}
+
+#else
+
+static bool block_rtas_call(int token, int nargs,
+			    struct rtas_args *args)
+{
+	return false;
+}
+
+#endif /* CONFIG_PPC_RTAS_FILTER */
+
+/* We assume to be passed big endian arguments */
+SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
+{
+	struct rtas_args args;
+	unsigned long flags;
+	char *buff_copy, *errbuf = NULL;
+	int nargs, nret, token;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (!rtas.entry)
+		return -EINVAL;
+
+	if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
+		return -EFAULT;
+
+	nargs = be32_to_cpu(args.nargs);
+	nret  = be32_to_cpu(args.nret);
+	token = be32_to_cpu(args.token);
+
+	if (nargs >= ARRAY_SIZE(args.args)
+	    || nret > ARRAY_SIZE(args.args)
+	    || nargs + 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;
+
+	if (token == RTAS_UNKNOWN_SERVICE)
+		return -EINVAL;
+
+	args.rets = &args.args[nargs];
+	memset(args.rets, 0, nret * sizeof(rtas_arg_t));
+
+	if (block_rtas_call(token, nargs, &args))
+		return -EINVAL;
+
+	/* Need to handle ibm,suspend_me call specially */
+	if (token == ibm_suspend_me_token) {
+
+		/*
+		 * rtas_ibm_suspend_me assumes the streamid handle is in cpu
+		 * endian, or at least the hcall within it requires it.
+		 */
+		int rc = 0;
+		u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32)
+		              | be32_to_cpu(args.args[1]);
+		rc = rtas_ibm_suspend_me(handle);
+		if (rc == -EAGAIN)
+			args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE);
+		else if (rc == -EIO)
+			args.rets[0] = cpu_to_be32(-1);
+		else if (rc)
+			return rc;
+		goto copy_return;
+	}
+
+	buff_copy = get_errorlog_buffer();
+
+	flags = lock_rtas();
+
+	rtas.args = args;
+	enter_rtas(__pa(&rtas.args));
+	args = rtas.args;
+
+	/* A -1 return code indicates that the last command couldn't
+	   be completed due to a hardware error. */
+	if (be32_to_cpu(args.rets[0]) == -1)
+		errbuf = __fetch_rtas_last_error(buff_copy);
+
+	unlock_rtas(flags);
+
+	if (buff_copy) {
+		if (errbuf)
+			log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
+		kfree(buff_copy);
+	}
+
+ copy_return:
+	/* Copy out args. */
+	if (copy_to_user(uargs->args + nargs,
+			 args.args + nargs,
+			 nret * sizeof(rtas_arg_t)) != 0)
+		return -EFAULT;
+
+	return 0;
+}
+
+/*
+ * Call early during boot, before mem init, to retrieve the RTAS
+ * information from the device-tree and allocate the RMO buffer for userland
+ * accesses.
+ */
+void __init rtas_initialize(void)
+{
+	unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
+	u32 base, size, entry;
+	int no_base, no_size, no_entry;
+#ifdef CONFIG_PPC_RTAS_FILTER
+	int i;
+#endif
+
+	/* 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)
+		return;
+
+	no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);
+	no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);
+	if (no_base || no_size) {
+		of_node_put(rtas.dev);
+		rtas.dev = NULL;
+		return;
+	}
+
+	rtas.base = base;
+	rtas.size = size;
+	no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);
+	rtas.entry = no_entry ? rtas.base : entry;
+
+	/* If RTAS was found, allocate the RMO buffer for it and look for
+	 * the stop-self token if any
+	 */
+#ifdef CONFIG_PPC64
+	if (firmware_has_feature(FW_FEATURE_LPAR)) {
+		rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
+		ibm_suspend_me_token = rtas_token("ibm,suspend-me");
+	}
+#endif
+	rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
+
+#ifdef CONFIG_RTAS_ERROR_LOGGING
+	rtas_last_error_token = rtas_token("rtas-last-error");
+#endif
+
+#ifdef CONFIG_PPC_RTAS_FILTER
+	for (i = 0; i < ARRAY_SIZE(rtas_filters); i++) {
+		rtas_filters[i].token = rtas_token(rtas_filters[i].name);
+	}
+#endif
+}
+
+int __init early_init_dt_scan_rtas(unsigned long node,
+		const char *uname, int depth, void *data)
+{
+	const u32 *basep, *entryp, *sizep;
+
+	if (depth != 1 || strcmp(uname, "rtas") != 0)
+		return 0;
+
+	basep  = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
+	entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
+	sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);
+
+#ifdef CONFIG_PPC64
+	/* need this feature to decide the crashkernel offset */
+	if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL))
+		powerpc_firmware_features |= FW_FEATURE_LPAR;
+#endif
+
+	if (basep && entryp && sizep) {
+		rtas.base = *basep;
+		rtas.entry = *entryp;
+		rtas.size = *sizep;
+	}
+
+#ifdef CONFIG_UDBG_RTAS_CONSOLE
+	basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
+	if (basep)
+		rtas_putchar_token = *basep;
+
+	basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
+	if (basep)
+		rtas_getchar_token = *basep;
+
+	if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
+	    rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
+		udbg_init_rtas_console();
+
+#endif
+
+	/* break now */
+	return 1;
+}
+
+static arch_spinlock_t timebase_lock;
+static u64 timebase = 0;
+
+void rtas_give_timebase(void)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	hard_irq_disable();
+	arch_spin_lock(&timebase_lock);
+	rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
+	timebase = get_tb();
+	arch_spin_unlock(&timebase_lock);
+
+	while (timebase)
+		barrier();
+	rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
+	local_irq_restore(flags);
+}
+
+void rtas_take_timebase(void)
+{
+	while (!timebase)
+		barrier();
+	arch_spin_lock(&timebase_lock);
+	set_tb(timebase >> 32, timebase & 0xffffffff);
+	timebase = 0;
+	arch_spin_unlock(&timebase_lock);
+}