cregit-Linux how code gets into the kernel

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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Benjamin Herrenschmidt3397.06%150.00%
Thomas Gleixner12.94%150.00%
Total34100.00%2100.00%


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

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Benjamin Herrenschmidt2596.15%150.00%
Thomas Gleixner13.85%150.00%
Total26100.00%2100.00%

/* * 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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Benjamin Herrenschmidt2040.00%337.50%
Anton Blanchard1734.00%225.00%
Michael Ellerman1224.00%225.00%
Paul Mackerras12.00%112.50%
Total50100.00%8100.00%


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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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt9397.89%250.00%
Paul Mackerras11.05%125.00%
Michael Ellerman11.05%125.00%
Total95100.00%4100.00%


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

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Michael Ellerman12100.00%2100.00%
Total12100.00%2100.00%

#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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Michael Ellerman71100.00%1100.00%
Total71100.00%1100.00%


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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Michael Ellerman43100.00%1100.00%
Total43100.00%1100.00%


static int udbg_rtascon_getc(void) { int c; while ((c = udbg_rtascon_getc_poll()) == -1) ; return c; }

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Michael Ellerman27100.00%1100.00%
Total27100.00%1100.00%


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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Michael Ellerman20100.00%1100.00%
Total20100.00%1100.00%

#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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Arnd Bergmann36969.23%112.50%
Mike Strosaker13625.52%112.50%
Anton Blanchard101.88%112.50%
Stephen Rothwell101.88%225.00%
Jeremy Kerr61.13%112.50%
Tobias Klauser10.19%112.50%
Paul Mackerras10.19%112.50%
Total533100.00%8100.00%

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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PersonTokensPropCommitsCommitProp
Anton Blanchard4794.00%240.00%
Stephen Rothwell12.00%120.00%
Jeremy Kerr12.00%120.00%
Paul Mackerras12.00%120.00%
Total50100.00%5100.00%

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

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Nathan T. Lynch18100.00%1100.00%
Total18100.00%1100.00%

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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Paul Mackerras3257.14%240.00%
Anton Blanchard2035.71%120.00%
Andrew Morton35.36%120.00%
Benjamin Herrenschmidt11.79%120.00%
Total56100.00%5100.00%

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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Paul Mackerras8642.36%330.00%
Andrew Morton6833.50%220.00%
Anton Blanchard3316.26%220.00%
David Gibson125.91%110.00%
Michael Ellerman20.99%110.00%
Benjamin Herrenschmidt20.99%110.00%
Total203100.00%10100.00%

#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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PersonTokensPropCommitsCommitProp
Anton Blanchard10582.68%250.00%
Michael Ellerman2116.54%125.00%
David Gibson10.79%125.00%
Total127100.00%4100.00%


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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PersonTokensPropCommitsCommitProp
Michael Ellerman49100.00%1100.00%
Total49100.00%1100.00%


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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Michael Ellerman9443.72%218.18%
Anton Blanchard7133.02%327.27%
Benjamin Herrenschmidt2210.23%218.18%
Paul Mackerras167.44%327.27%
Andrew Morton125.58%19.09%
Total215100.00%11100.00%

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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Anton Blanchard4057.97%125.00%
John Rose2434.78%125.00%
Thomas Huth34.35%125.00%
Andrew Morton22.90%125.00%
Total69100.00%4100.00%

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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John Rose3181.58%133.33%
Anton Blanchard718.42%266.67%
Total38100.00%3100.00%

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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Paul Mackerras9096.77%125.00%
Michael Ellerman11.08%125.00%
Andrew Morton11.08%125.00%
Harvey Harrison11.08%125.00%
Total93100.00%4100.00%


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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Andrew Morton5675.68%133.33%
Paul Mackerras1824.32%266.67%
Total74100.00%3100.00%

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; }

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Andrew Morton5873.42%125.00%
Paul Mackerras1620.25%250.00%
John Rose56.33%125.00%
Total79100.00%4100.00%

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

PersonTokensPropCommitsCommitProp
Andrew Morton5873.42%125.00%
Paul Mackerras1620.25%250.00%
John Rose56.33%125.00%
Total79100.00%4100.00%

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; }

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PersonTokensPropCommitsCommitProp
Thomas Huth85100.00%1100.00%
Total85100.00%1100.00%


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; }

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Nathan T. Lynch11093.22%150.00%
Anton Blanchard86.78%150.00%
Total118100.00%2100.00%

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; }

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Andrew Morton6075.00%133.33%
Paul Mackerras1518.75%133.33%
John Rose56.25%133.33%
Total80100.00%3100.00%

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; }

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Haren Myneni8396.51%150.00%
Thomas Huth33.49%150.00%
Total86100.00%2100.00%


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 (;;); }

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Anton Blanchard3272.73%120.00%
Paul Mackerras1125.00%360.00%
Daniel Axtens12.27%120.00%
Total44100.00%5100.00%


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 (;;); }

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Anton Blanchard3368.75%125.00%
Paul Mackerras1531.25%375.00%
Total48100.00%4100.00%


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 (;;); }

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Paul Mackerras4183.67%250.00%
Anton Blanchard714.29%125.00%
Daniel Axtens12.04%125.00%
Total49100.00%4100.00%

/* 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"