1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Procedures for interfacing to the RTAS on CHRP machines.
6 * Peter Bergner, IBM March 2001.
7 * Copyright (C) 2001 IBM.
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/spinlock.h>
14 #include <linux/export.h>
15 #include <linux/init.h>
16 #include <linux/capability.h>
17 #include <linux/delay.h>
18 #include <linux/cpu.h>
19 #include <linux/sched.h>
20 #include <linux/smp.h>
21 #include <linux/completion.h>
22 #include <linux/cpumask.h>
23 #include <linux/memblock.h>
24 #include <linux/slab.h>
25 #include <linux/reboot.h>
26 #include <linux/syscalls.h>
28 #include <asm/interrupt.h>
31 #include <asm/hvcall.h>
32 #include <asm/machdep.h>
33 #include <asm/firmware.h>
35 #include <asm/param.h>
36 #include <asm/delay.h>
37 #include <linux/uaccess.h>
39 #include <asm/syscalls.h>
41 #include <linux/atomic.h>
44 #include <asm/topology.h>
47 /* This is here deliberately so it's only used in this file */
48 void enter_rtas(unsigned long);
50 static inline void do_enter_rtas(unsigned long args)
54 srr_regs_clobbered(); /* rtas uses SRRs, invalidate */
57 struct rtas_t rtas = {
58 .lock = __ARCH_SPIN_LOCK_UNLOCKED
62 DEFINE_SPINLOCK(rtas_data_buf_lock);
63 EXPORT_SYMBOL(rtas_data_buf_lock);
65 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
66 EXPORT_SYMBOL(rtas_data_buf);
68 unsigned long rtas_rmo_buf;
71 * If non-NULL, this gets called when the kernel terminates.
72 * This is done like this so rtas_flash can be a module.
74 void (*rtas_flash_term_hook)(int);
75 EXPORT_SYMBOL(rtas_flash_term_hook);
77 /* RTAS use home made raw locking instead of spin_lock_irqsave
78 * because those can be called from within really nasty contexts
79 * such as having the timebase stopped which would lockup with
80 * normal locks and spinlock debugging enabled
82 static unsigned long lock_rtas(void)
86 local_irq_save(flags);
88 arch_spin_lock(&rtas.lock);
92 static void unlock_rtas(unsigned long flags)
94 arch_spin_unlock(&rtas.lock);
95 local_irq_restore(flags);
100 * call_rtas_display_status and call_rtas_display_status_delay
101 * are designed only for very early low-level debugging, which
102 * is why the token is hard-coded to 10.
104 static void call_rtas_display_status(unsigned char c)
112 rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);
116 static void call_rtas_display_status_delay(char c)
118 static int pending_newline = 0; /* did last write end with unprinted newline? */
119 static int width = 16;
123 call_rtas_display_status(' ');
128 if (pending_newline) {
129 call_rtas_display_status('\r');
130 call_rtas_display_status('\n');
134 call_rtas_display_status(c);
140 void __init udbg_init_rtas_panel(void)
142 udbg_putc = call_rtas_display_status_delay;
145 #ifdef CONFIG_UDBG_RTAS_CONSOLE
147 /* If you think you're dying before early_init_dt_scan_rtas() does its
148 * work, you can hard code the token values for your firmware here and
149 * hardcode rtas.base/entry etc.
151 static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
152 static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
154 static void udbg_rtascon_putc(char c)
161 /* Add CRs before LFs */
163 udbg_rtascon_putc('\r');
165 /* if there is more than one character to be displayed, wait a bit */
166 for (tries = 0; tries < 16; tries++) {
167 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
173 static int udbg_rtascon_getc_poll(void)
180 if (rtas_call(rtas_getchar_token, 0, 2, &c))
186 static int udbg_rtascon_getc(void)
190 while ((c = udbg_rtascon_getc_poll()) == -1)
197 void __init udbg_init_rtas_console(void)
199 udbg_putc = udbg_rtascon_putc;
200 udbg_getc = udbg_rtascon_getc;
201 udbg_getc_poll = udbg_rtascon_getc_poll;
203 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
205 void rtas_progress(char *s, unsigned short hex)
207 struct device_node *root;
211 static int display_character, set_indicator;
212 static int display_width, display_lines, form_feed;
213 static const int *row_width;
214 static DEFINE_SPINLOCK(progress_lock);
215 static int current_line;
216 static int pending_newline = 0; /* did last write end with unprinted newline? */
221 if (display_width == 0) {
222 display_width = 0x10;
223 if ((root = of_find_node_by_path("/rtas"))) {
224 if ((p = of_get_property(root,
225 "ibm,display-line-length", NULL)))
226 display_width = be32_to_cpu(*p);
227 if ((p = of_get_property(root,
228 "ibm,form-feed", NULL)))
229 form_feed = be32_to_cpu(*p);
230 if ((p = of_get_property(root,
231 "ibm,display-number-of-lines", NULL)))
232 display_lines = be32_to_cpu(*p);
233 row_width = of_get_property(root,
234 "ibm,display-truncation-length", NULL);
237 display_character = rtas_token("display-character");
238 set_indicator = rtas_token("set-indicator");
241 if (display_character == RTAS_UNKNOWN_SERVICE) {
242 /* use hex display if available */
243 if (set_indicator != RTAS_UNKNOWN_SERVICE)
244 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
248 spin_lock(&progress_lock);
251 * Last write ended with newline, but we didn't print it since
252 * it would just clear the bottom line of output. Print it now
255 * If no newline is pending and form feed is supported, clear the
256 * display with a form feed; otherwise, print a CR to start output
257 * at the beginning of the line.
259 if (pending_newline) {
260 rtas_call(display_character, 1, 1, NULL, '\r');
261 rtas_call(display_character, 1, 1, NULL, '\n');
266 rtas_call(display_character, 1, 1, NULL,
269 rtas_call(display_character, 1, 1, NULL, '\r');
273 width = row_width[current_line];
275 width = display_width;
278 if (*os == '\n' || *os == '\r') {
279 /* If newline is the last character, save it
280 * until next call to avoid bumping up the
283 if (*os == '\n' && !os[1]) {
286 if (current_line > display_lines-1)
287 current_line = display_lines-1;
288 spin_unlock(&progress_lock);
292 /* RTAS wants CR-LF, not just LF */
295 rtas_call(display_character, 1, 1, NULL, '\r');
296 rtas_call(display_character, 1, 1, NULL, '\n');
298 /* CR might be used to re-draw a line, so we'll
299 * leave it alone and not add LF.
301 rtas_call(display_character, 1, 1, NULL, *os);
305 width = row_width[current_line];
307 width = display_width;
310 rtas_call(display_character, 1, 1, NULL, *os);
315 /* if we overwrite the screen length */
317 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
321 spin_unlock(&progress_lock);
323 EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
325 int rtas_token(const char *service)
328 if (rtas.dev == NULL)
329 return RTAS_UNKNOWN_SERVICE;
330 tokp = of_get_property(rtas.dev, service, NULL);
331 return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE;
333 EXPORT_SYMBOL(rtas_token);
335 int rtas_service_present(const char *service)
337 return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
339 EXPORT_SYMBOL(rtas_service_present);
341 #ifdef CONFIG_RTAS_ERROR_LOGGING
343 * Return the firmware-specified size of the error log buffer
344 * for all rtas calls that require an error buffer argument.
345 * This includes 'check-exception' and 'rtas-last-error'.
347 int rtas_get_error_log_max(void)
349 static int rtas_error_log_max;
350 if (rtas_error_log_max)
351 return rtas_error_log_max;
353 rtas_error_log_max = rtas_token ("rtas-error-log-max");
354 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
355 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
356 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
358 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
360 return rtas_error_log_max;
362 EXPORT_SYMBOL(rtas_get_error_log_max);
365 static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
366 static int rtas_last_error_token;
368 /** Return a copy of the detailed error text associated with the
369 * most recent failed call to rtas. Because the error text
370 * might go stale if there are any other intervening rtas calls,
371 * this routine must be called atomically with whatever produced
372 * the error (i.e. with rtas.lock still held from the previous call).
374 static char *__fetch_rtas_last_error(char *altbuf)
376 struct rtas_args err_args, save_args;
380 if (rtas_last_error_token == -1)
383 bufsz = rtas_get_error_log_max();
385 err_args.token = cpu_to_be32(rtas_last_error_token);
386 err_args.nargs = cpu_to_be32(2);
387 err_args.nret = cpu_to_be32(1);
388 err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf));
389 err_args.args[1] = cpu_to_be32(bufsz);
390 err_args.args[2] = 0;
392 save_args = rtas.args;
393 rtas.args = err_args;
395 do_enter_rtas(__pa(&rtas.args));
397 err_args = rtas.args;
398 rtas.args = save_args;
400 /* Log the error in the unlikely case that there was one. */
401 if (unlikely(err_args.args[2] == 0)) {
406 if (slab_is_available())
407 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
410 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
416 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
418 #else /* CONFIG_RTAS_ERROR_LOGGING */
419 #define __fetch_rtas_last_error(x) NULL
420 #define get_errorlog_buffer() NULL
425 va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret,
430 args->token = cpu_to_be32(token);
431 args->nargs = cpu_to_be32(nargs);
432 args->nret = cpu_to_be32(nret);
433 args->rets = &(args->args[nargs]);
435 for (i = 0; i < nargs; ++i)
436 args->args[i] = cpu_to_be32(va_arg(list, __u32));
438 for (i = 0; i < nret; ++i)
441 do_enter_rtas(__pa(args));
444 void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...)
448 va_start(list, nret);
449 va_rtas_call_unlocked(args, token, nargs, nret, list);
453 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
458 struct rtas_args *rtas_args;
459 char *buff_copy = NULL;
462 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
467 /* We use the global rtas args buffer */
468 rtas_args = &rtas.args;
470 va_start(list, outputs);
471 va_rtas_call_unlocked(rtas_args, token, nargs, nret, list);
474 /* A -1 return code indicates that the last command couldn't
475 be completed due to a hardware error. */
476 if (be32_to_cpu(rtas_args->rets[0]) == -1)
477 buff_copy = __fetch_rtas_last_error(NULL);
479 if (nret > 1 && outputs != NULL)
480 for (i = 0; i < nret-1; ++i)
481 outputs[i] = be32_to_cpu(rtas_args->rets[i+1]);
482 ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0;
487 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
488 if (slab_is_available())
493 EXPORT_SYMBOL(rtas_call);
495 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
496 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
498 unsigned int rtas_busy_delay_time(int status)
503 if (status == RTAS_BUSY) {
505 } else if (status >= RTAS_EXTENDED_DELAY_MIN &&
506 status <= RTAS_EXTENDED_DELAY_MAX) {
507 order = status - RTAS_EXTENDED_DELAY_MIN;
508 for (ms = 1; order > 0; order--)
514 EXPORT_SYMBOL(rtas_busy_delay_time);
516 /* For an RTAS busy status code, perform the hinted delay. */
517 unsigned int rtas_busy_delay(int status)
522 ms = rtas_busy_delay_time(status);
523 if (ms && need_resched())
528 EXPORT_SYMBOL(rtas_busy_delay);
530 static int rtas_error_rc(int rtas_rc)
535 case -1: /* Hardware Error */
538 case -3: /* Bad indicator/domain/etc */
541 case -9000: /* Isolation error */
544 case -9001: /* Outstanding TCE/PTE */
547 case -9002: /* No usable slot */
551 printk(KERN_ERR "%s: unexpected RTAS error %d\n",
559 int rtas_get_power_level(int powerdomain, int *level)
561 int token = rtas_token("get-power-level");
564 if (token == RTAS_UNKNOWN_SERVICE)
567 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
571 return rtas_error_rc(rc);
574 EXPORT_SYMBOL(rtas_get_power_level);
576 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
578 int token = rtas_token("set-power-level");
581 if (token == RTAS_UNKNOWN_SERVICE)
585 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
586 } while (rtas_busy_delay(rc));
589 return rtas_error_rc(rc);
592 EXPORT_SYMBOL(rtas_set_power_level);
594 int rtas_get_sensor(int sensor, int index, int *state)
596 int token = rtas_token("get-sensor-state");
599 if (token == RTAS_UNKNOWN_SERVICE)
603 rc = rtas_call(token, 2, 2, state, sensor, index);
604 } while (rtas_busy_delay(rc));
607 return rtas_error_rc(rc);
610 EXPORT_SYMBOL(rtas_get_sensor);
612 int rtas_get_sensor_fast(int sensor, int index, int *state)
614 int token = rtas_token("get-sensor-state");
617 if (token == RTAS_UNKNOWN_SERVICE)
620 rc = rtas_call(token, 2, 2, state, sensor, index);
621 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
622 rc <= RTAS_EXTENDED_DELAY_MAX));
625 return rtas_error_rc(rc);
629 bool rtas_indicator_present(int token, int *maxindex)
631 int proplen, count, i;
632 const struct indicator_elem {
637 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
641 count = proplen / sizeof(struct indicator_elem);
643 for (i = 0; i < count; i++) {
644 if (__be32_to_cpu(indicators[i].token) != token)
647 *maxindex = __be32_to_cpu(indicators[i].maxindex);
653 EXPORT_SYMBOL(rtas_indicator_present);
655 int rtas_set_indicator(int indicator, int index, int new_value)
657 int token = rtas_token("set-indicator");
660 if (token == RTAS_UNKNOWN_SERVICE)
664 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
665 } while (rtas_busy_delay(rc));
668 return rtas_error_rc(rc);
671 EXPORT_SYMBOL(rtas_set_indicator);
674 * Ignoring RTAS extended delay
676 int rtas_set_indicator_fast(int indicator, int index, int new_value)
679 int token = rtas_token("set-indicator");
681 if (token == RTAS_UNKNOWN_SERVICE)
684 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
686 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
687 rc <= RTAS_EXTENDED_DELAY_MAX));
690 return rtas_error_rc(rc);
696 * rtas_ibm_suspend_me() - Call ibm,suspend-me to suspend the LPAR.
698 * @fw_status: RTAS call status will be placed here if not NULL.
700 * rtas_ibm_suspend_me() should be called only on a CPU which has
701 * received H_CONTINUE from the H_JOIN hcall. All other active CPUs
702 * should be waiting to return from H_JOIN.
704 * rtas_ibm_suspend_me() may suspend execution of the OS
705 * indefinitely. Callers should take appropriate measures upon return, such as
706 * resetting watchdog facilities.
708 * Callers may choose to retry this call if @fw_status is
709 * %RTAS_THREADS_ACTIVE.
712 * 0 - The partition has resumed from suspend, possibly after
713 * migration to a different host.
714 * -ECANCELED - The operation was aborted.
715 * -EAGAIN - There were other CPUs not in H_JOIN at the time of the call.
716 * -EBUSY - Some other condition prevented the suspend from succeeding.
717 * -EIO - Hardware/platform error.
719 int rtas_ibm_suspend_me(int *fw_status)
724 fwrc = rtas_call(rtas_token("ibm,suspend-me"), 0, 1, NULL);
730 case RTAS_SUSPEND_ABORTED:
733 case RTAS_THREADS_ACTIVE:
736 case RTAS_NOT_SUSPENDABLE:
737 case RTAS_OUTSTANDING_COPROC:
752 void __noreturn rtas_restart(char *cmd)
754 if (rtas_flash_term_hook)
755 rtas_flash_term_hook(SYS_RESTART);
756 printk("RTAS system-reboot returned %d\n",
757 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
761 void rtas_power_off(void)
763 if (rtas_flash_term_hook)
764 rtas_flash_term_hook(SYS_POWER_OFF);
765 /* allow power on only with power button press */
766 printk("RTAS power-off returned %d\n",
767 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
771 void __noreturn rtas_halt(void)
773 if (rtas_flash_term_hook)
774 rtas_flash_term_hook(SYS_HALT);
775 /* allow power on only with power button press */
776 printk("RTAS power-off returned %d\n",
777 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
781 /* Must be in the RMO region, so we place it here */
782 static char rtas_os_term_buf[2048];
784 void rtas_os_term(char *str)
789 * Firmware with the ibm,extended-os-term property is guaranteed
790 * to always return from an ibm,os-term call. Earlier versions without
791 * this property may terminate the partition which we want to avoid
792 * since it interferes with panic_timeout.
794 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
795 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
798 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
801 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
802 __pa(rtas_os_term_buf));
803 } while (rtas_busy_delay(status));
806 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
810 * rtas_activate_firmware() - Activate a new version of firmware.
812 * Activate a new version of partition firmware. The OS must call this
813 * after resuming from a partition hibernation or migration in order
814 * to maintain the ability to perform live firmware updates. It's not
815 * catastrophic for this method to be absent or to fail; just log the
816 * condition in that case.
818 * Context: This function may sleep.
820 void rtas_activate_firmware(void)
825 token = rtas_token("ibm,activate-firmware");
826 if (token == RTAS_UNKNOWN_SERVICE) {
827 pr_notice("ibm,activate-firmware method unavailable\n");
832 fwrc = rtas_call(token, 0, 1, NULL);
833 } while (rtas_busy_delay(fwrc));
836 pr_err("ibm,activate-firmware failed (%i)\n", fwrc);
839 #ifdef CONFIG_PPC_PSERIES
841 * rtas_call_reentrant() - Used for reentrant rtas calls
842 * @token: Token for desired reentrant RTAS call
843 * @nargs: Number of Input Parameters
844 * @nret: Number of Output Parameters
845 * @outputs: Array of outputs
846 * @...: Inputs for desired RTAS call
848 * According to LoPAR documentation, only "ibm,int-on", "ibm,int-off",
849 * "ibm,get-xive" and "ibm,set-xive" are currently reentrant.
850 * Reentrant calls need their own rtas_args buffer, so not using rtas.args, but
853 * Return: -1 on error,
854 * First output value of RTAS call if (nret > 0),
857 int rtas_call_reentrant(int token, int nargs, int nret, int *outputs, ...)
860 struct rtas_args *args;
864 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
867 local_irq_save(flags);
870 /* We use the per-cpu (PACA) rtas args buffer */
871 args = local_paca->rtas_args_reentrant;
873 va_start(list, outputs);
874 va_rtas_call_unlocked(args, token, nargs, nret, list);
877 if (nret > 1 && outputs)
878 for (i = 0; i < nret - 1; ++i)
879 outputs[i] = be32_to_cpu(args->rets[i + 1]);
882 ret = be32_to_cpu(args->rets[0]);
884 local_irq_restore(flags);
890 #endif /* CONFIG_PPC_PSERIES */
893 * Find a specific pseries error log in an RTAS extended event log.
894 * @log: RTAS error/event log
895 * @section_id: two character section identifier
897 * Returns a pointer to the specified errorlog or NULL if not found.
899 struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
902 struct rtas_ext_event_log_v6 *ext_log =
903 (struct rtas_ext_event_log_v6 *)log->buffer;
904 struct pseries_errorlog *sect;
905 unsigned char *p, *log_end;
906 uint32_t ext_log_length = rtas_error_extended_log_length(log);
907 uint8_t log_format = rtas_ext_event_log_format(ext_log);
908 uint32_t company_id = rtas_ext_event_company_id(ext_log);
910 /* Check that we understand the format */
911 if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) ||
912 log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
913 company_id != RTAS_V6EXT_COMPANY_ID_IBM)
916 log_end = log->buffer + ext_log_length;
917 p = ext_log->vendor_log;
919 while (p < log_end) {
920 sect = (struct pseries_errorlog *)p;
921 if (pseries_errorlog_id(sect) == section_id)
923 p += pseries_errorlog_length(sect);
929 #ifdef CONFIG_PPC_RTAS_FILTER
932 * The sys_rtas syscall, as originally designed, allows root to pass
933 * arbitrary physical addresses to RTAS calls. A number of RTAS calls
934 * can be abused to write to arbitrary memory and do other things that
935 * are potentially harmful to system integrity, and thus should only
936 * be used inside the kernel and not exposed to userspace.
938 * All known legitimate users of the sys_rtas syscall will only ever
939 * pass addresses that fall within the RMO buffer, and use a known
940 * subset of RTAS calls.
942 * Accordingly, we filter RTAS requests to check that the call is
943 * permitted, and that provided pointers fall within the RMO buffer.
944 * The rtas_filters list contains an entry for each permitted call,
945 * with the indexes of the parameters which are expected to contain
946 * addresses and sizes of buffers allocated inside the RMO buffer.
951 /* Indexes into the args buffer, -1 if not used */
960 static struct rtas_filter rtas_filters[] __ro_after_init = {
961 { "ibm,activate-firmware", -1, -1, -1, -1, -1 },
962 { "ibm,configure-connector", -1, 0, -1, 1, -1, 4096 }, /* Special cased */
963 { "display-character", -1, -1, -1, -1, -1 },
964 { "ibm,display-message", -1, 0, -1, -1, -1 },
965 { "ibm,errinjct", -1, 2, -1, -1, -1, 1024 },
966 { "ibm,close-errinjct", -1, -1, -1, -1, -1 },
967 { "ibm,open-errinjct", -1, -1, -1, -1, -1 },
968 { "ibm,get-config-addr-info2", -1, -1, -1, -1, -1 },
969 { "ibm,get-dynamic-sensor-state", -1, 1, -1, -1, -1 },
970 { "ibm,get-indices", -1, 2, 3, -1, -1 },
971 { "get-power-level", -1, -1, -1, -1, -1 },
972 { "get-sensor-state", -1, -1, -1, -1, -1 },
973 { "ibm,get-system-parameter", -1, 1, 2, -1, -1 },
974 { "get-time-of-day", -1, -1, -1, -1, -1 },
975 { "ibm,get-vpd", -1, 0, -1, 1, 2 },
976 { "ibm,lpar-perftools", -1, 2, 3, -1, -1 },
977 { "ibm,platform-dump", -1, 4, 5, -1, -1 },
978 { "ibm,read-slot-reset-state", -1, -1, -1, -1, -1 },
979 { "ibm,scan-log-dump", -1, 0, 1, -1, -1 },
980 { "ibm,set-dynamic-indicator", -1, 2, -1, -1, -1 },
981 { "ibm,set-eeh-option", -1, -1, -1, -1, -1 },
982 { "set-indicator", -1, -1, -1, -1, -1 },
983 { "set-power-level", -1, -1, -1, -1, -1 },
984 { "set-time-for-power-on", -1, -1, -1, -1, -1 },
985 { "ibm,set-system-parameter", -1, 1, -1, -1, -1 },
986 { "set-time-of-day", -1, -1, -1, -1, -1 },
987 #ifdef CONFIG_CPU_BIG_ENDIAN
988 { "ibm,suspend-me", -1, -1, -1, -1, -1 },
989 { "ibm,update-nodes", -1, 0, -1, -1, -1, 4096 },
990 { "ibm,update-properties", -1, 0, -1, -1, -1, 4096 },
992 { "ibm,physical-attestation", -1, 0, 1, -1, -1 },
995 static bool in_rmo_buf(u32 base, u32 end)
997 return base >= rtas_rmo_buf &&
998 base < (rtas_rmo_buf + RTAS_USER_REGION_SIZE) &&
1000 end >= rtas_rmo_buf &&
1001 end < (rtas_rmo_buf + RTAS_USER_REGION_SIZE);
1004 static bool block_rtas_call(int token, int nargs,
1005 struct rtas_args *args)
1009 for (i = 0; i < ARRAY_SIZE(rtas_filters); i++) {
1010 struct rtas_filter *f = &rtas_filters[i];
1011 u32 base, size, end;
1013 if (token != f->token)
1016 if (f->buf_idx1 != -1) {
1017 base = be32_to_cpu(args->args[f->buf_idx1]);
1018 if (f->size_idx1 != -1)
1019 size = be32_to_cpu(args->args[f->size_idx1]);
1020 else if (f->fixed_size)
1021 size = f->fixed_size;
1025 end = base + size - 1;
1026 if (!in_rmo_buf(base, end))
1030 if (f->buf_idx2 != -1) {
1031 base = be32_to_cpu(args->args[f->buf_idx2]);
1032 if (f->size_idx2 != -1)
1033 size = be32_to_cpu(args->args[f->size_idx2]);
1034 else if (f->fixed_size)
1035 size = f->fixed_size;
1038 end = base + size - 1;
1041 * Special case for ibm,configure-connector where the
1044 if (!strcmp(f->name, "ibm,configure-connector") &&
1048 if (!in_rmo_buf(base, end))
1056 pr_err_ratelimited("sys_rtas: RTAS call blocked - exploit attempt?\n");
1057 pr_err_ratelimited("sys_rtas: token=0x%x, nargs=%d (called by %s)\n",
1058 token, nargs, current->comm);
1062 static void __init rtas_syscall_filter_init(void)
1066 for (i = 0; i < ARRAY_SIZE(rtas_filters); i++)
1067 rtas_filters[i].token = rtas_token(rtas_filters[i].name);
1072 static bool block_rtas_call(int token, int nargs,
1073 struct rtas_args *args)
1078 static void __init rtas_syscall_filter_init(void)
1082 #endif /* CONFIG_PPC_RTAS_FILTER */
1084 /* We assume to be passed big endian arguments */
1085 SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
1087 struct rtas_args args;
1088 unsigned long flags;
1089 char *buff_copy, *errbuf = NULL;
1090 int nargs, nret, token;
1092 if (!capable(CAP_SYS_ADMIN))
1098 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
1101 nargs = be32_to_cpu(args.nargs);
1102 nret = be32_to_cpu(args.nret);
1103 token = be32_to_cpu(args.token);
1105 if (nargs >= ARRAY_SIZE(args.args)
1106 || nret > ARRAY_SIZE(args.args)
1107 || nargs + nret > ARRAY_SIZE(args.args))
1111 if (copy_from_user(args.args, uargs->args,
1112 nargs * sizeof(rtas_arg_t)) != 0)
1115 if (token == RTAS_UNKNOWN_SERVICE)
1118 args.rets = &args.args[nargs];
1119 memset(args.rets, 0, nret * sizeof(rtas_arg_t));
1121 if (block_rtas_call(token, nargs, &args))
1124 /* Need to handle ibm,suspend_me call specially */
1125 if (token == rtas_token("ibm,suspend-me")) {
1128 * rtas_ibm_suspend_me assumes the streamid handle is in cpu
1129 * endian, or at least the hcall within it requires it.
1132 u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32)
1133 | be32_to_cpu(args.args[1]);
1134 rc = rtas_syscall_dispatch_ibm_suspend_me(handle);
1136 args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE);
1137 else if (rc == -EIO)
1138 args.rets[0] = cpu_to_be32(-1);
1144 buff_copy = get_errorlog_buffer();
1146 flags = lock_rtas();
1149 do_enter_rtas(__pa(&rtas.args));
1152 /* A -1 return code indicates that the last command couldn't
1153 be completed due to a hardware error. */
1154 if (be32_to_cpu(args.rets[0]) == -1)
1155 errbuf = __fetch_rtas_last_error(buff_copy);
1161 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
1166 /* Copy out args. */
1167 if (copy_to_user(uargs->args + nargs,
1169 nret * sizeof(rtas_arg_t)) != 0)
1176 * Call early during boot, before mem init, to retrieve the RTAS
1177 * information from the device-tree and allocate the RMO buffer for userland
1180 void __init rtas_initialize(void)
1182 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
1183 u32 base, size, entry;
1184 int no_base, no_size, no_entry;
1186 /* Get RTAS dev node and fill up our "rtas" structure with infos
1189 rtas.dev = of_find_node_by_name(NULL, "rtas");
1193 no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);
1194 no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);
1195 if (no_base || no_size) {
1196 of_node_put(rtas.dev);
1203 no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);
1204 rtas.entry = no_entry ? rtas.base : entry;
1206 /* If RTAS was found, allocate the RMO buffer for it and look for
1207 * the stop-self token if any
1210 if (firmware_has_feature(FW_FEATURE_LPAR))
1211 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
1213 rtas_rmo_buf = memblock_phys_alloc_range(RTAS_USER_REGION_SIZE, PAGE_SIZE,
1216 panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n",
1217 PAGE_SIZE, &rtas_region);
1219 #ifdef CONFIG_RTAS_ERROR_LOGGING
1220 rtas_last_error_token = rtas_token("rtas-last-error");
1223 rtas_syscall_filter_init();
1226 int __init early_init_dt_scan_rtas(unsigned long node,
1227 const char *uname, int depth, void *data)
1229 const u32 *basep, *entryp, *sizep;
1231 if (depth != 1 || strcmp(uname, "rtas") != 0)
1234 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
1235 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
1236 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
1238 if (basep && entryp && sizep) {
1240 rtas.entry = *entryp;
1244 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1245 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1247 rtas_putchar_token = *basep;
1249 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1251 rtas_getchar_token = *basep;
1253 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1254 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1255 udbg_init_rtas_console();
1263 static arch_spinlock_t timebase_lock;
1264 static u64 timebase = 0;
1266 void rtas_give_timebase(void)
1268 unsigned long flags;
1270 local_irq_save(flags);
1272 arch_spin_lock(&timebase_lock);
1273 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1274 timebase = get_tb();
1275 arch_spin_unlock(&timebase_lock);
1279 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1280 local_irq_restore(flags);
1283 void rtas_take_timebase(void)
1287 arch_spin_lock(&timebase_lock);
1288 set_tb(timebase >> 32, timebase & 0xffffffff);
1290 arch_spin_unlock(&timebase_lock);