diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/kernel/rtas.c')
-rw-r--r-- | ANDROID_3.4.5/arch/powerpc/kernel/rtas.c | 1088 |
1 files changed, 0 insertions, 1088 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/kernel/rtas.c b/ANDROID_3.4.5/arch/powerpc/kernel/rtas.c deleted file mode 100644 index fcec3824..00000000 --- a/ANDROID_3.4.5/arch/powerpc/kernel/rtas.c +++ /dev/null @@ -1,1088 +0,0 @@ -/* - * - * 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/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> -#include <asm/pSeries_reconfig.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(char c) -{ - struct rtas_args *args = &rtas.args; - unsigned long s; - - if (!rtas.base) - return; - s = lock_rtas(); - - args->token = 10; - args->nargs = 1; - args->nret = 1; - args->rets = (rtas_arg_t *)&(args->args[1]); - args->args[0] = (unsigned char)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 int *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 = *p; - if ((p = of_get_property(root, - "ibm,form-feed", NULL))) - form_feed = *p; - if ((p = of_get_property(root, - "ibm,display-number-of-lines", NULL))) - display_lines = *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 int *tokp; - if (rtas.dev == NULL) - return RTAS_UNKNOWN_SERVICE; - tokp = of_get_property(rtas.dev, service, NULL); - return tokp ? *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 = rtas_last_error_token; - err_args.nargs = 2; - err_args.nret = 1; - err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); - err_args.args[1] = 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 (mem_init_done) - 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 = token; - rtas_args->nargs = nargs; - rtas_args->nret = nret; - rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); - va_start(list, outputs); - for (i = 0; i < nargs; ++i) - rtas_args->args[i] = va_arg(list, rtas_arg_t); - 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 (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] = rtas_args->rets[i+1]; - ret = (nret > 0)? rtas_args->rets[0]: 0; - - unlock_rtas(s); - - if (buff_copy) { - log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); - if (mem_init_done) - 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 { - u32 token; - u32 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 (indicators[i].token != token) - continue; - if (maxindex) - *maxindex = 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); -} - -int rtas_ibm_suspend_me(struct rtas_args *args) -{ - long state; - long rc; - unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; - struct rtas_suspend_me_data data; - DECLARE_COMPLETION_ONSTACK(done); - - if (!rtas_service_present("ibm,suspend-me")) - return -ENOSYS; - - /* Make sure the state is valid */ - rc = plpar_hcall(H_VASI_STATE, retbuf, - ((u64)args->args[0] << 32) | args->args[1]); - - 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) { - args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; - return 0; - } else if (state != H_VASI_SUSPENDING) { - printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", - state); - args->args[args->nargs] = -1; - return 0; - } - - 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; - 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(); - - return atomic_read(&data.error); -} -#else /* CONFIG_PPC_PSERIES */ -int rtas_ibm_suspend_me(struct rtas_args *args) -{ - 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; - - /* Check that we understand the format */ - if (log->extended_log_length < sizeof(struct rtas_ext_event_log_v6) || - ext_log->log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG || - ext_log->company_id != RTAS_V6EXT_COMPANY_ID_IBM) - return NULL; - - log_end = log->buffer + log->extended_log_length; - p = ext_log->vendor_log; - - while (p < log_end) { - sect = (struct pseries_errorlog *)p; - if (sect->id == section_id) - return sect; - p += sect->length; - } - - return NULL; -} - -asmlinkage int ppc_rtas(struct rtas_args __user *uargs) -{ - struct rtas_args args; - unsigned long flags; - char *buff_copy, *errbuf = NULL; - int nargs; - int rc; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) - return -EFAULT; - - nargs = args.nargs; - if (nargs > ARRAY_SIZE(args.args) - || args.nret > ARRAY_SIZE(args.args) - || nargs + args.nret > ARRAY_SIZE(args.args)) - return -EINVAL; - - /* Copy in args. */ - if (copy_from_user(args.args, uargs->args, - nargs * sizeof(rtas_arg_t)) != 0) - return -EFAULT; - - if (args.token == RTAS_UNKNOWN_SERVICE) - return -EINVAL; - - args.rets = &args.args[nargs]; - memset(args.rets, 0, args.nret * sizeof(rtas_arg_t)); - - /* Need to handle ibm,suspend_me call specially */ - if (args.token == ibm_suspend_me_token) { - rc = rtas_ibm_suspend_me(&args); - 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 (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, - args.nret * sizeof(rtas_arg_t)) != 0) - return -EFAULT; - - return 0; -} - -/* - * Call early during boot, before mem init or bootmem, to retrieve the RTAS - * informations from the device-tree and allocate the RMO buffer for userland - * accesses. - */ -void __init rtas_initialize(void) -{ - unsigned long rtas_region = RTAS_INSTANTIATE_MAX; - - /* Get RTAS dev node and fill up our "rtas" structure with infos - * about it. - */ - rtas.dev = of_find_node_by_name(NULL, "rtas"); - if (rtas.dev) { - const u32 *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 = *basep; - rtas.size = *sizep; - entryp = of_get_property(rtas.dev, - "linux,rtas-entry", NULL); - if (entryp == NULL) /* Ugh */ - rtas.entry = rtas.base; - else - rtas.entry = *entryp; - } else - rtas.dev = NULL; - } - if (!rtas.dev) - return; - - /* If RTAS was found, allocate the RMO buffer for it and look for - * the stop-self token if any - */ -#ifdef CONFIG_PPC64 - if (machine_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) -{ - 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 __cpuinit 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 __cpuinit 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); -} |