11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 2001 Dave Engebretsen IBM Corporation 3d9953105ce000abcfa988d0c160b2662186f5879Michael Ellerman * 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is free software; you can redistribute it and/or modify 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * it under the terms of the GNU General Public License as published by 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (at your option) any later version. 8d9953105ce000abcfa988d0c160b2662186f5879Michael Ellerman * 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is distributed in the hope that it will be useful, 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * GNU General Public License for more details. 13d9953105ce000abcfa988d0c160b2662186f5879Michael Ellerman * 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * You should have received a copy of the GNU General Public License 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * along with this program; if not, write to the Free Software 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/sched.h> 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/interrupt.h> 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/irq.h> 2290128997815009686ec9d72a4b1490455d838e66Anton Blanchard#include <linux/of.h> 2355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#include <linux/fs.h> 2455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#include <linux/reboot.h> 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/machdep.h> 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/rtas.h> 288c4f1f2958ff9d4a6760f3bdd0cfb7d2b9e12093Michael Ellerman#include <asm/firmware.h> 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 30577830b034bc11c93d4b9e21e8782900d5485e7fMichael Ellerman#include "pseries.h" 31c902be71dc6d5e8473bd021feafc8c3608e2b82aArnd Bergmann 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX]; 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic DEFINE_SPINLOCK(ras_log_buf_lock); 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 35d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchardstatic char global_mce_data_buf[RTAS_ERROR_LOG_MAX]; 36d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchardstatic DEFINE_PER_CPU(__u64, mce_data_buf); 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int ras_check_exception_token; 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define EPOW_SENSOR_TOKEN 9 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define EPOW_SENSOR_INDEX 0 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 437d12e780e003f93433d49ce78cfedf4b4c52adc5David Howellsstatic irqreturn_t ras_epow_interrupt(int irq, void *dev_id); 447d12e780e003f93433d49ce78cfedf4b4c52adc5David Howellsstatic irqreturn_t ras_error_interrupt(int irq, void *dev_id); 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 460ebfff1491ef85d41ddf9c633834838be144f69fBenjamin Herrenschmidt 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Initialize handlers for the set of interrupts caused by hardware errors 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * and power system events. 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init init_ras_IRQ(void) 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct device_node *np; 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ras_check_exception_token = rtas_token("check-exception"); 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Internal Errors */ 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds np = of_find_node_by_path("/event-sources/internal-errors"); 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (np != NULL) { 6032c96f7765b881ab1f6ab8ff04b733e4cf157239Mark Nelson request_event_sources_irqs(np, ras_error_interrupt, 6132c96f7765b881ab1f6ab8ff04b733e4cf157239Mark Nelson "RAS_ERROR"); 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds of_node_put(np); 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* EPOW Events */ 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds np = of_find_node_by_path("/event-sources/epow-events"); 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (np != NULL) { 6832c96f7765b881ab1f6ab8ff04b733e4cf157239Mark Nelson request_event_sources_irqs(np, ras_epow_interrupt, "RAS_EPOW"); 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds of_node_put(np); 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7269ed3324983bb937d78a8579ed91b90242ee5aaaAnton Blanchard return 0; 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchardsubsys_initcall(init_ras_IRQ); 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_SHUTDOWN_NORMAL 1 7755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_SHUTDOWN_ON_UPS 2 7855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS 3 7955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH 4 8055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 8155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchardstatic void handle_system_shutdown(char event_modifier) 8255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard{ 8355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard switch (event_modifier) { 8455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_SHUTDOWN_NORMAL: 8555fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_emerg("Firmware initiated power off"); 8655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard orderly_poweroff(1); 8755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard break; 8855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 8955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_SHUTDOWN_ON_UPS: 9055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_emerg("Loss of power reported by firmware, system is " 9155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard "running on UPS/battery"); 9255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard break; 9355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 9455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS: 9555fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_emerg("Loss of system critical functions reported by " 9655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard "firmware"); 9755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_emerg("Check RTAS error log for details"); 9855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard orderly_poweroff(1); 9955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard break; 10055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 10155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH: 10255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_emerg("Ambient temperature too high reported by firmware"); 10355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_emerg("Check RTAS error log for details"); 10455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard orderly_poweroff(1); 10555fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard break; 10655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 10755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard default: 10855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_err("Unknown power/cooling shutdown event (modifier %d)", 10955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard event_modifier); 11055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard } 11155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard} 11255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 11355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchardstruct epow_errorlog { 11455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard unsigned char sensor_value; 11555fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard unsigned char event_modifier; 11655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard unsigned char extended_modifier; 11755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard unsigned char reserved; 11855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard unsigned char platform_reason; 11955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard}; 12055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 12155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_RESET 0 12255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_WARN_COOLING 1 12355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_WARN_POWER 2 12455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_SYSTEM_SHUTDOWN 3 12555fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_SYSTEM_HALT 4 12655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_MAIN_ENCLOSURE 5 12755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard#define EPOW_POWER_OFF 7 12855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 12955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchardvoid rtas_parse_epow_errlog(struct rtas_error_log *log) 13055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard{ 13155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard struct pseries_errorlog *pseries_log; 13255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard struct epow_errorlog *epow_log; 13355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard char action_code; 13455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard char modifier; 13555fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 13655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pseries_log = get_pseries_errorlog(log, PSERIES_ELOG_SECT_ID_EPOW); 13755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard if (pseries_log == NULL) 13855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard return; 13955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 14055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard epow_log = (struct epow_errorlog *)pseries_log->data; 14155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard action_code = epow_log->sensor_value & 0xF; /* bottom 4 bits */ 14255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard modifier = epow_log->event_modifier & 0xF; /* bottom 4 bits */ 14355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 14455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard switch (action_code) { 14555fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_RESET: 14655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_err("Non critical power or cooling issue cleared"); 14755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard break; 14855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 14955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_WARN_COOLING: 15055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_err("Non critical cooling issue reported by firmware"); 15155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_err("Check RTAS error log for details"); 15255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard break; 15355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 15455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_WARN_POWER: 15555fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_err("Non critical power issue reported by firmware"); 15655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_err("Check RTAS error log for details"); 15755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard break; 15855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 15955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_SYSTEM_SHUTDOWN: 16055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard handle_system_shutdown(epow_log->event_modifier); 16155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard break; 16255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 16355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_SYSTEM_HALT: 16455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_emerg("Firmware initiated power off"); 16555fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard orderly_poweroff(1); 16655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard break; 16755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 16855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_MAIN_ENCLOSURE: 16955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard case EPOW_POWER_OFF: 17055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_emerg("Critical power/cooling issue reported by firmware"); 17155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_emerg("Check RTAS error log for details"); 17255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_emerg("Immediate power off"); 17355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard emergency_sync(); 17455fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard kernel_power_off(); 17555fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard break; 17655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 17755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard default: 17855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard pr_err("Unknown power/cooling event (action code %d)", 17955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard action_code); 18055fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard } 18155fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard} 18255fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 18355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard/* Handle environmental and power warning (EPOW) interrupts. */ 1847d12e780e003f93433d49ce78cfedf4b4c52adc5David Howellsstatic irqreturn_t ras_epow_interrupt(int irq, void *dev_id) 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 18655fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard int status; 18755fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard int state; 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int critical; 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 190587f83e8dd50d22bc0c62e32ec49fd319b0912feAnton Blanchard status = rtas_get_sensor(EPOW_SENSOR_TOKEN, EPOW_SENSOR_INDEX, &state); 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (state > 3) 19355fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard critical = 1; /* Time Critical */ 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds critical = 0; 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&ras_log_buf_lock); 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds status = rtas_call(ras_check_exception_token, 6, 1, NULL, 200b08e281b5ae681abcbc1815c13d4a3eb3df4ff1bMark Nelson RTAS_VECTOR_EXTERNAL_INTERRUPT, 201476eb4912601a8c01e6702b9a029f476b4b131d2Grant Likely virq_to_hw(irq), 2026f43747f6a7ef216fbea1d5b5d94044d504e12ceAnton Blanchard RTAS_EPOW_WARNING, 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds critical, __pa(&ras_log_buf), 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtas_get_error_log_max()); 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0); 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 20855fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard rtas_parse_epow_errlog((struct rtas_error_log *)ras_log_buf); 20955fc0c561742c710857dc5a7a591b461a561cf1fAnton Blanchard 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&ras_log_buf_lock); 2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Handle hardware error interrupts. 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * RTAS check-exception is called to collect data on the exception. If 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the error is deemed recoverable, we log a warning and return. 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * For nonrecoverable errors, an error is logged and we stop all processing 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * as quickly as possible in order to prevent propagation of the failure. 2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2227d12e780e003f93433d49ce78cfedf4b4c52adc5David Howellsstatic irqreturn_t ras_error_interrupt(int irq, void *dev_id) 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct rtas_error_log *rtas_elog; 225cc8b526366e8bed9a950288316e0ab03bef4420aAnton Blanchard int status; 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int fatal; 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&ras_log_buf_lock); 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds status = rtas_call(ras_check_exception_token, 6, 1, NULL, 231b08e281b5ae681abcbc1815c13d4a3eb3df4ff1bMark Nelson RTAS_VECTOR_EXTERNAL_INTERRUPT, 232476eb4912601a8c01e6702b9a029f476b4b131d2Grant Likely virq_to_hw(irq), 233cc8b526366e8bed9a950288316e0ab03bef4420aAnton Blanchard RTAS_INTERNAL_ERROR, 1 /* Time Critical */, 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds __pa(&ras_log_buf), 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtas_get_error_log_max()); 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtas_elog = (struct rtas_error_log *)ras_log_buf; 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((status == 0) && (rtas_elog->severity >= RTAS_SEVERITY_ERROR_SYNC)) 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds fatal = 1; 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds fatal = 0; 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* format and print the extended information */ 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, fatal); 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (fatal) { 248cc8b526366e8bed9a950288316e0ab03bef4420aAnton Blanchard pr_emerg("Fatal hardware error reported by firmware"); 249cc8b526366e8bed9a950288316e0ab03bef4420aAnton Blanchard pr_emerg("Check RTAS error log for details"); 250cc8b526366e8bed9a950288316e0ab03bef4420aAnton Blanchard pr_emerg("Immediate power off"); 251cc8b526366e8bed9a950288316e0ab03bef4420aAnton Blanchard emergency_sync(); 252cc8b526366e8bed9a950288316e0ab03bef4420aAnton Blanchard kernel_power_off(); 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 254cc8b526366e8bed9a950288316e0ab03bef4420aAnton Blanchard pr_err("Recoverable hardware error reported by firmware"); 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&ras_log_buf_lock); 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 261d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard/* 262d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard * Some versions of FWNMI place the buffer inside the 4kB page starting at 263d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard * 0x7000. Other versions place it inside the rtas buffer. We check both. 264d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard */ 265d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard#define VALID_FWNMI_BUFFER(A) \ 266d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard ((((A) >= 0x7000) && ((A) < 0x7ff0)) || \ 267d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard (((A) >= rtas.base) && ((A) < (rtas.base + rtas.size - 16)))) 268d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard 269d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard/* 270d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard * Get the error information for errors coming through the 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * FWNMI vectors. The pt_regs' r3 will be updated to reflect 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the actual r3 if possible, and a ptr to the error log entry 2731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * will be returned if found. 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 275d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard * If the RTAS error is not of the extended type, then we put it in a per 276d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard * cpu 64bit buffer. If it is the extended type we use global_mce_data_buf. 277d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard * 278d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard * The global_mce_data_buf does not have any locks or protection around it, 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * if a second machine check comes in, or a system reset is done 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * before we have logged the error, then we will get corruption in the 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * error log. This is preferable over holding off on calling 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * ibm,nmi-interlock which would result in us checkstopping if a 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * second machine check did come in. 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs) 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long *savep; 288d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard struct rtas_error_log *h, *errhdr = NULL; 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 290d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard if (!VALID_FWNMI_BUFFER(regs->gpr[3])) { 291f0e939ae373836400b38e090d78fba6a183976f0Anton Blanchard printk(KERN_ERR "FWNMI: corrupt r3 0x%016lx\n", regs->gpr[3]); 292d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard return NULL; 293d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard } 294d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard 295d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard savep = __va(regs->gpr[3]); 296d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard regs->gpr[3] = savep[0]; /* restore original r3 */ 297d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard 298d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard /* If it isn't an extended log we can use the per cpu 64bit buffer */ 299d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard h = (struct rtas_error_log *)&savep[1]; 300d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard if (!h->extended) { 301d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard memcpy(&__get_cpu_var(mce_data_buf), h, sizeof(__u64)); 302d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard errhdr = (struct rtas_error_log *)&__get_cpu_var(mce_data_buf); 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 304d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard int len; 305d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard 306d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard len = max_t(int, 8+h->extended_log_length, RTAS_ERROR_LOG_MAX); 307d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard memset(global_mce_data_buf, 0, RTAS_ERROR_LOG_MAX); 308d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard memcpy(global_mce_data_buf, h, len); 309d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard errhdr = (struct rtas_error_log *)global_mce_data_buf; 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 311d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return errhdr; 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Call this when done with the data returned by FWNMI_get_errinfo. 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * It will release the saved data area for other CPUs in the 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * partition to receive FWNMI errors. 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void fwnmi_release_errinfo(void) 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret = rtas_call(rtas_token("ibm,nmi-interlock"), 0, 1, NULL); 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret != 0) 323d368514c3097a48a109b6ba64e12047106c7473dAnton Blanchard printk(KERN_ERR "FWNMI: nmi-interlock failed: %d\n", ret); 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 326c902be71dc6d5e8473bd021feafc8c3608e2b82aArnd Bergmannint pSeries_system_reset_exception(struct pt_regs *regs) 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (fwnmi_active) { 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct rtas_error_log *errhdr = fwnmi_get_errinfo(regs); 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (errhdr) { 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* XXX Should look at FWNMI information */ 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds fwnmi_release_errinfo(); 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 335c902be71dc6d5e8473bd021feafc8c3608e2b82aArnd Bergmann return 0; /* need to perform reset */ 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * See if we can recover from a machine check exception. 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This is only called on power4 (or above) and only via 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the Firmware Non-Maskable Interrupts (fwnmi) handler 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * which provides the error analysis for us. 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Return 1 if corrected (or delivered a signal). 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Return 0 if there is nothing we can do. 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 347d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchardstatic int recover_mce(struct pt_regs *regs, struct rtas_error_log *err) 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 349d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard int recovered = 0; 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 351d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard if (!(regs->msr & MSR_RI)) { 352d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard /* If MSR_RI isn't set, we cannot recover */ 353d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard recovered = 0; 354d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard 355d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard } else if (err->disposition == RTAS_DISP_FULLY_RECOVERED) { 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Platform corrected itself */ 357d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard recovered = 1; 358d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard 359d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard } else if (err->disposition == RTAS_DISP_LIMITED_RECOVERY) { 360d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard /* Platform corrected itself but could be degraded */ 361d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard printk(KERN_ERR "MCE: limited recovery, system may " 362d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard "be degraded\n"); 363d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard recovered = 1; 364d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard 365d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard } else if (user_mode(regs) && !is_global_init(current) && 366d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard err->severity == RTAS_SEVERITY_ERROR_SYNC) { 367d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard 368d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard /* 369d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard * If we received a synchronous error when in userspace 370d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard * kill the task. Firmware may report details of the fail 371d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard * asynchronously, so we can't rely on the target and type 372d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard * fields being valid here. 373d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard */ 374d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard printk(KERN_ERR "MCE: uncorrectable error, killing task " 375d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard "%s:%d\n", current->comm, current->pid); 376d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard 377d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 378d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard recovered = 1; 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3813f9793e6b66efcf196974ee4f0d62de6282eb41bAnton Blanchard log_error((char *)err, ERR_TYPE_RTAS_LOG, 0); 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 383d47d1d8af52e37bcf9059dd86878474e5ccc9c2aAnton Blanchard return recovered; 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Handle a machine check. 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Note that on Power 4 and beyond Firmware Non-Maskable Interrupts (fwnmi) 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * should be present. If so the handler which called us tells us if the 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * error was recovered (never true if RI=0). 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * On hardware prior to Power 4 these exceptions were asynchronous which 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * means we can't tell exactly where it occurred and so we can't recover. 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint pSeries_machine_check_exception(struct pt_regs *regs) 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct rtas_error_log *errp; 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (fwnmi_active) { 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds errp = fwnmi_get_errinfo(regs); 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds fwnmi_release_errinfo(); 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (errp && recover_mce(regs, errp)) 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 1; 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 409