--- /dev/null
+/*
+ *
+ * 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 <asm/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>
+
+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;
+}
+
+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)
+{
+ struct rtas_args *args = &rtas.args;
+ unsigned long s;
+
+ if (!rtas.base)
+ return;
+ s = lock_rtas();
+
+ args->token = cpu_to_be32(10);
+ args->nargs = cpu_to_be32(1);
+ args->nret = cpu_to_be32(1);
+ args->rets = &(args->args[1]);
+ args->args[0] = cpu_to_be32(c);
+
+ enter_rtas(__pa(args));
+
+ 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
+
+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();
+ rtas_args = &rtas.args;
+
+ rtas_args->token = cpu_to_be32(token);
+ rtas_args->nargs = cpu_to_be32(nargs);
+ rtas_args->nret = cpu_to_be32(nret);
+ rtas_args->rets = &(rtas_args->args[nargs]);
+ va_start(list, outputs);
+ for (i = 0; i < nargs; ++i)
+ rtas_args->args[i] = cpu_to_be32(va_arg(list, __u32));
+ va_end(list);
+
+ for (i = 0; i < nret; ++i)
+ rtas_args->rets[i] = 0;
+
+ enter_rtas(__pa(rtas_args));
+
+ /* 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 >= 9900 && status <= 9905) {
+ order = status - 9900;
+ 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);
+
+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 == -2 || (rc >= 9900 && rc <= 9905));
+
+ 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;
+
+ /*
+ * 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) {
+ switch (state) {
+ case DOWN:
+ cpuret = cpu_down(cpu);
+ break;
+ case UP:
+ cpuret = cpu_up(cpu);
+ break;
+ }
+ if (cpuret) {
+ 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_TEMPORARY))
+ 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_TEMPORARY))
+ 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;
+
+ /* 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;
+ }
+
+ 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();
+
+ /* 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:
+ 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;
+}
+
+/* We assume to be passed big endian arguments */
+asmlinkage int ppc_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 (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));
+
+ /* 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;
+
+ /* 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) {
+ const __be32 *basep, *entryp, *sizep;
+
+ basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
+ sizep = of_get_property(rtas.dev, "rtas-size", NULL);
+ if (basep != NULL && sizep != NULL) {
+ rtas.base = __be32_to_cpu(*basep);
+ rtas.size = __be32_to_cpu(*sizep);
+ entryp = of_get_property(rtas.dev,
+ "linux,rtas-entry", NULL);
+ if (entryp == NULL) /* Ugh */
+ rtas.entry = rtas.base;
+ else
+ rtas.entry = __be32_to_cpu(*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_is(pseries) && 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
+}
+
+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);
+
+ 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);
+}
Code Review / kvmfornfv.git / blobdiff