1 // SPDX-License-Identifier: GPL-2.0-or-later
49 void enter_rtas(unsigned long);
51 static inline void do_enter_rtas(unsigned long args)  in do_enter_rtas()
53 	unsigned long msr;  in do_enter_rtas()
82 unsigned long rtas_rmo_buf;
85  * If non-NULL, this gets called when the kernel terminates.
96 static unsigned long lock_rtas(void)  in lock_rtas()
98 	unsigned long flags;  in lock_rtas()
106 static void unlock_rtas(unsigned long flags)  in unlock_rtas()
115  * are designed only for very early low-level debugging, which
116  * is why the token is hard-coded to 10.
120 	unsigned long s;  in call_rtas_display_status()
136 		while (width-- > 0)  in call_rtas_display_status_delay()
147 		if (width--) {  in call_rtas_display_status_delay()
192 		return -1;  in udbg_rtascon_getc_poll()
195 		return -1;  in udbg_rtascon_getc_poll()
204 	while ((c = udbg_rtascon_getc_poll()) == -1)  in udbg_rtascon_getc()
239 					"ibm,display-line-length", NULL)))  in rtas_progress()
242 					"ibm,form-feed", NULL)))  in rtas_progress()
245 					"ibm,display-number-of-lines", NULL)))  in rtas_progress()
248 					"ibm,display-truncation-length", NULL);  in rtas_progress()
251 		display_character = rtas_token("display-character");  in rtas_progress()
252 		set_indicator = rtas_token("set-indicator");  in rtas_progress()
300 				if (current_line > display_lines-1)  in rtas_progress()
301 					current_line = display_lines-1;  in rtas_progress()
306 			/* RTAS wants CR-LF, not just LF */  in rtas_progress()
312 				/* CR might be used to re-draw a line, so we'll  in rtas_progress()
323 			width--;  in rtas_progress()
357  * Return the firmware-specified size of the error log buffer
359  *  This includes 'check-exception' and 'rtas-last-error'.
367 	rtas_error_log_max = rtas_token ("rtas-error-log-max");  in rtas_get_error_log_max()
394 	if (rtas_last_error_token == -1)  in __fetch_rtas_last_error()
444 	args->token = cpu_to_be32(token);  in va_rtas_call_unlocked()
445 	args->nargs = cpu_to_be32(nargs);  in va_rtas_call_unlocked()
446 	args->nret  = cpu_to_be32(nret);  in va_rtas_call_unlocked()
447 	args->rets  = &(args->args[nargs]);  in va_rtas_call_unlocked()
450 		args->args[i] = cpu_to_be32(va_arg(list, __u32));  in va_rtas_call_unlocked()
453 		args->rets[i] = 0;  in va_rtas_call_unlocked()
474 	unsigned long s;  in rtas_call()
480 		return -1;  in rtas_call()
489 			return -1;  in rtas_call()
494 		return -1;  in rtas_call()
506 	/* A -1 return code indicates that the last command couldn't  in rtas_call()
508 	if (be32_to_cpu(rtas_args->rets[0]) == -1)  in rtas_call()
512 		for (i = 0; i < nret-1; ++i)  in rtas_call()
513 			outputs[i] = be32_to_cpu(rtas_args->rets[i+1]);  in rtas_call()
514 	ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0;  in rtas_call()
528  * rtas_busy_delay_time() - From an RTAS status value, calculate the
537  * * 100000 - If @status is 9905.
538  * * 10000  - If @status is 9904.
539  * * 1000   - If @status is 9903.
540  * * 100    - If @status is 9902.
541  * * 10     - If @status is 9901.
542  * * 1      - If @status is either 9900 or -2. This is "wrong" for -2, but
545  * * 0      - If @status is not a busy or extended delay value.
550 	unsigned int ms = 0;  in rtas_busy_delay_time()  local
553 		ms = 1;  in rtas_busy_delay_time()
556 		order = status - RTAS_EXTENDED_DELAY_MIN;  in rtas_busy_delay_time()
557 		for (ms = 1; order > 0; order--)  in rtas_busy_delay_time()
558 			ms *= 10;  in rtas_busy_delay_time()
561 	return ms;  in rtas_busy_delay_time()
566  * rtas_busy_delay() - helper for RTAS busy and extended delay statuses
574  * * true  - @status is RTAS_BUSY or an extended delay hint. The
580  * * false - @status is not @RTAS_BUSY nor an extended delay hint. The
585 	unsigned int ms;  in rtas_busy_delay()  local
591 		ms = rtas_busy_delay_time(status);  in rtas_busy_delay()
598 		ms = clamp(ms, 1U, 1000U);  in rtas_busy_delay()
600 		 * The delay hint is an order-of-magnitude suggestion, not  in rtas_busy_delay()
606 		 * See Documentation/timers/timers-howto.rst for  in rtas_busy_delay()
609 		 * 9902-9905.  in rtas_busy_delay()
611 		if (ms <= 20)  in rtas_busy_delay()
612 			usleep_range(ms * 100, ms * 1000);  in rtas_busy_delay()
614 			msleep(ms);  in rtas_busy_delay()
644 		case -1: 		/* Hardware Error */  in rtas_error_rc()
645 			rc = -EIO;  in rtas_error_rc()
647 		case -3:		/* Bad indicator/domain/etc */  in rtas_error_rc()
648 			rc = -EINVAL;  in rtas_error_rc()
650 		case -9000:		/* Isolation error */  in rtas_error_rc()
651 			rc = -EFAULT;  in rtas_error_rc()
653 		case -9001:		/* Outstanding TCE/PTE */  in rtas_error_rc()
654 			rc = -EEXIST;  in rtas_error_rc()
656 		case -9002:		/* No usable slot */  in rtas_error_rc()
657 			rc = -ENODEV;  in rtas_error_rc()
662 			rc = -ERANGE;  in rtas_error_rc()
670 	int token = rtas_token("get-power-level");  in rtas_get_power_level()
674 		return -ENOENT;  in rtas_get_power_level()
687 	int token = rtas_token("set-power-level");  in rtas_set_power_level()
691 		return -ENOENT;  in rtas_set_power_level()
705 	int token = rtas_token("get-sensor-state");  in rtas_get_sensor()
709 		return -ENOENT;  in rtas_get_sensor()
723 	int token = rtas_token("get-sensor-state");  in rtas_get_sensor_fast()
727 		return -ENOENT;  in rtas_get_sensor_fast()
746 	indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);  in rtas_indicator_present()
766 	int token = rtas_token("set-indicator");  in rtas_set_indicator()
770 		return -ENOENT;  in rtas_set_indicator()
788 	int token = rtas_token("set-indicator");  in rtas_set_indicator_fast()
791 		return -ENOENT;  in rtas_set_indicator_fast()
805  * rtas_ibm_suspend_me() - Call ibm,suspend-me to suspend the LPAR.
821  * 0          - The partition has resumed from suspend, possibly after
823  * -ECANCELED - The operation was aborted.
824  * -EAGAIN    - There were other CPUs not in H_JOIN at the time of the call.
825  * -EBUSY     - Some other condition prevented the suspend from succeeding.
826  * -EIO       - Hardware/platform error.
833 	fwrc = rtas_call(rtas_token("ibm,suspend-me"), 0, 1, NULL);  in rtas_ibm_suspend_me()
840 		ret = -ECANCELED;  in rtas_ibm_suspend_me()
843 		ret = -EAGAIN;  in rtas_ibm_suspend_me()
847 		ret = -EBUSY;  in rtas_ibm_suspend_me()
849 	case -1:  in rtas_ibm_suspend_me()
851 		ret = -EIO;  in rtas_ibm_suspend_me()
865 	printk("RTAS system-reboot returned %d\n",  in rtas_restart()
866 	       rtas_call(rtas_token("system-reboot"), 0, 1, NULL));  in rtas_restart()
874 	/* allow power on only with power button press */  in rtas_power_off()
875 	printk("RTAS power-off returned %d\n",  in rtas_power_off()
876 	       rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));  in rtas_power_off()
884 	/* allow power on only with power button press */  in rtas_halt()
885 	printk("RTAS power-off returned %d\n",  in rtas_halt()
886 	       rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));  in rtas_halt()
898 	 * Firmware with the ibm,extended-os-term property is guaranteed  in rtas_os_term()
899 	 * to always return from an ibm,os-term call. Earlier versions without  in rtas_os_term()
903 	if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||  in rtas_os_term()
904 	    RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))  in rtas_os_term()
910 		status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,  in rtas_os_term()
915 		printk(KERN_EMERG "ibm,os-term call failed %d\n", status);  in rtas_os_term()
919  * rtas_activate_firmware() - Activate a new version of firmware.
934 	token = rtas_token("ibm,activate-firmware");  in rtas_activate_firmware()
936 		pr_notice("ibm,activate-firmware method unavailable\n");  in rtas_activate_firmware()
945 		pr_err("ibm,activate-firmware failed (%i)\n", fwrc);  in rtas_activate_firmware()
949  * get_pseries_errorlog() - Find a specific pseries error log in an RTAS
960 		(struct rtas_ext_event_log_v6 *)log->buffer;  in get_pseries_errorlog()
973 	log_end = log->buffer + ext_log_length;  in get_pseries_errorlog()
974 	p = ext_log->vendor_log;  in get_pseries_errorlog()
1008 	/* Indexes into the args buffer, -1 if not used */
1018 	{ "ibm,activate-firmware", -1, -1, -1, -1, -1 },
1019 	{ "ibm,configure-connector", -1, 0, -1, 1, -1, 4096 },	/* Special cased */
1020 	{ "display-character", -1, -1, -1, -1, -1 },
1021 	{ "ibm,display-message", -1, 0, -1, -1, -1 },
1022 	{ "ibm,errinjct", -1, 2, -1, -1, -1, 1024 },
1023 	{ "ibm,close-errinjct", -1, -1, -1, -1, -1 },
1024 	{ "ibm,open-errinjct", -1, -1, -1, -1, -1 },
1025 	{ "ibm,get-config-addr-info2", -1, -1, -1, -1, -1 },
1026 	{ "ibm,get-dynamic-sensor-state", -1, 1, -1, -1, -1 },
1027 	{ "ibm,get-indices", -1, 2, 3, -1, -1 },
1028 	{ "get-power-level", -1, -1, -1, -1, -1 },
1029 	{ "get-sensor-state", -1, -1, -1, -1, -1 },
1030 	{ "ibm,get-system-parameter", -1, 1, 2, -1, -1 },
1031 	{ "get-time-of-day", -1, -1, -1, -1, -1 },
1032 	{ "ibm,get-vpd", -1, 0, -1, 1, 2 },
1033 	{ "ibm,lpar-perftools", -1, 2, 3, -1, -1 },
1034 	{ "ibm,platform-dump", -1, 4, 5, -1, -1 },		/* Special cased */
1035 	{ "ibm,read-slot-reset-state", -1, -1, -1, -1, -1 },
1036 	{ "ibm,scan-log-dump", -1, 0, 1, -1, -1 },
1037 	{ "ibm,set-dynamic-indicator", -1, 2, -1, -1, -1 },
1038 	{ "ibm,set-eeh-option", -1, -1, -1, -1, -1 },
1039 	{ "set-indicator", -1, -1, -1, -1, -1 },
1040 	{ "set-power-level", -1, -1, -1, -1, -1 },
1041 	{ "set-time-for-power-on", -1, -1, -1, -1, -1 },
1042 	{ "ibm,set-system-parameter", -1, 1, -1, -1, -1 },
1043 	{ "set-time-of-day", -1, -1, -1, -1, -1 },
1045 	{ "ibm,suspend-me", -1, -1, -1, -1, -1 },
1046 	{ "ibm,update-nodes", -1, 0, -1, -1, -1, 4096 },
1047 	{ "ibm,update-properties", -1, 0, -1, -1, -1, 4096 },
1049 	{ "ibm,physical-attestation", -1, 0, 1, -1, -1 },
1070 		if (token != f->token)  in block_rtas_call()
1073 		if (f->buf_idx1 != -1) {  in block_rtas_call()
1074 			base = be32_to_cpu(args->args[f->buf_idx1]);  in block_rtas_call()
1075 			if (f->size_idx1 != -1)  in block_rtas_call()
1076 				size = be32_to_cpu(args->args[f->size_idx1]);  in block_rtas_call()
1077 			else if (f->fixed_size)  in block_rtas_call()
1078 				size = f->fixed_size;  in block_rtas_call()
1082 			end = base + size - 1;  in block_rtas_call()
1085 			 * Special case for ibm,platform-dump - NULL buffer  in block_rtas_call()
1088 			if (!strcmp(f->name, "ibm,platform-dump") &&  in block_rtas_call()
1096 		if (f->buf_idx2 != -1) {  in block_rtas_call()
1097 			base = be32_to_cpu(args->args[f->buf_idx2]);  in block_rtas_call()
1098 			if (f->size_idx2 != -1)  in block_rtas_call()
1099 				size = be32_to_cpu(args->args[f->size_idx2]);  in block_rtas_call()
1100 			else if (f->fixed_size)  in block_rtas_call()
1101 				size = f->fixed_size;  in block_rtas_call()
1104 			end = base + size - 1;  in block_rtas_call()
1107 			 * Special case for ibm,configure-connector where the  in block_rtas_call()
1110 			if (!strcmp(f->name, "ibm,configure-connector") &&  in block_rtas_call()
1122 	pr_err_ratelimited("sys_rtas: RTAS call blocked - exploit attempt?\n");  in block_rtas_call()
1124 			   token, nargs, current->comm);  in block_rtas_call()
1154 	unsigned long flags;  in SYSCALL_DEFINE1()
1159 		return -EPERM;  in SYSCALL_DEFINE1()
1162 		return -EINVAL;  in SYSCALL_DEFINE1()
1165 		return -EFAULT;  in SYSCALL_DEFINE1()
1174 		return -EINVAL;  in SYSCALL_DEFINE1()
1177 	if (copy_from_user(args.args, uargs->args,  in SYSCALL_DEFINE1()
1179 		return -EFAULT;  in SYSCALL_DEFINE1()
1182 		return -EINVAL;  in SYSCALL_DEFINE1()
1188 		return -EINVAL;  in SYSCALL_DEFINE1()
1199 	if (token == rtas_token("ibm,suspend-me")) {  in SYSCALL_DEFINE1()
1209 		if (rc == -EAGAIN)  in SYSCALL_DEFINE1()
1211 		else if (rc == -EIO)  in SYSCALL_DEFINE1()
1212 			args.rets[0] = cpu_to_be32(-1);  in SYSCALL_DEFINE1()
1226 	/* A -1 return code indicates that the last command couldn't  in SYSCALL_DEFINE1()
1228 	if (be32_to_cpu(args.rets[0]) == -1)  in SYSCALL_DEFINE1()
1241 	if (copy_to_user(uargs->args + nargs,  in SYSCALL_DEFINE1()
1244 		return -EFAULT;  in SYSCALL_DEFINE1()
1251  * information from the device-tree and allocate the RMO buffer for userland
1256 	unsigned long rtas_region = RTAS_INSTANTIATE_MAX;  in rtas_initialize()
1267 	no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);  in rtas_initialize()
1268 	no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);  in rtas_initialize()
1277 	no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);  in rtas_initialize()
1281 	 * the stop-self token if any  in rtas_initialize()
1294 	rtas_last_error_token = rtas_token("rtas-last-error");  in rtas_initialize()
1296 	ibm_open_errinjct_token = rtas_token("ibm,open-errinjct");  in rtas_initialize()
1301 int __init early_init_dt_scan_rtas(unsigned long node,  in early_init_dt_scan_rtas()
1309 	basep  = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);  in early_init_dt_scan_rtas()
1310 	entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);  in early_init_dt_scan_rtas()
1311 	sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);  in early_init_dt_scan_rtas()
1315 	if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL))  in early_init_dt_scan_rtas()
1326 	basep = of_get_flat_dt_prop(node, "put-term-char", NULL);  in early_init_dt_scan_rtas()
1330 	basep = of_get_flat_dt_prop(node, "get-term-char", NULL);  in early_init_dt_scan_rtas()
1349 	unsigned long flags;  in rtas_give_timebase()
1354 	rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);  in rtas_give_timebase()
1360 	rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);  in rtas_give_timebase()