cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/platforms/pseries/ras.c

/*
 * Copyright (C) 2001 Dave Engebretsen IBM Corporation
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/fs.h>
#include <linux/reboot.h>

#include <asm/machdep.h>
#include <asm/rtas.h>
#include <asm/firmware.h>

#include "pseries.h"


static unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX];
static DEFINE_SPINLOCK(ras_log_buf_lock);


static char global_mce_data_buf[RTAS_ERROR_LOG_MAX];
static DEFINE_PER_CPU(__u64, mce_data_buf);


static int ras_check_exception_token;


#define EPOW_SENSOR_TOKEN	9

#define EPOW_SENSOR_INDEX	0

/* EPOW events counter variable */

static int num_epow_events;

static irqreturn_t ras_hotplug_interrupt(int irq, void *dev_id);
static irqreturn_t ras_epow_interrupt(int irq, void *dev_id);
static irqreturn_t ras_error_interrupt(int irq, void *dev_id);


/*
 * Initialize handlers for the set of interrupts caused by hardware errors
 * and power system events.
 */

static int __init init_ras_IRQ(void) { struct device_node *np; ras_check_exception_token = rtas_token("check-exception"); /* Internal Errors */ np = of_find_node_by_path("/event-sources/internal-errors"); if (np != NULL) { request_event_sources_irqs(np, ras_error_interrupt, "RAS_ERROR"); of_node_put(np); } /* Hotplug Events */ np = of_find_node_by_path("/event-sources/hot-plug-events"); if (np != NULL) { request_event_sources_irqs(np, ras_hotplug_interrupt, "RAS_HOTPLUG"); of_node_put(np); } /* EPOW Events */ np = of_find_node_by_path("/event-sources/epow-events"); if (np != NULL) { request_event_sources_irqs(np, ras_epow_interrupt, "RAS_EPOW"); of_node_put(np); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mackerras5750.00%225.00%
John Allen3026.32%112.50%
Anton Blanchard1815.79%337.50%
Andrew Morton76.14%112.50%
Mark Nelson21.75%112.50%
Total114100.00%8100.00%

machine_subsys_initcall(pseries, init_ras_IRQ); #define EPOW_SHUTDOWN_NORMAL 1 #define EPOW_SHUTDOWN_ON_UPS 2 #define EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS 3 #define EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH 4
static void handle_system_shutdown(char event_modifier) { switch (event_modifier) { case EPOW_SHUTDOWN_NORMAL: pr_emerg("Power off requested\n"); orderly_poweroff(true); break; case EPOW_SHUTDOWN_ON_UPS: pr_emerg("Loss of system power detected. System is running on" " UPS/battery. Check RTAS error log for details\n"); orderly_poweroff(true); break; case EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS: pr_emerg("Loss of system critical functions detected. Check" " RTAS error log for details\n"); orderly_poweroff(true); break; case EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH: pr_emerg("High ambient temperature detected. Check RTAS" " error log for details\n"); orderly_poweroff(true); break; default: pr_err("Unknown power/cooling shutdown event (modifier = %d)\n", event_modifier); } }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard6478.05%125.00%
Vipin K Parashar89.76%125.00%
Anshuman Khandual78.54%125.00%
liguang33.66%125.00%
Total82100.00%4100.00%

struct epow_errorlog { unsigned char sensor_value; unsigned char event_modifier; unsigned char extended_modifier; unsigned char reserved; unsigned char platform_reason; }; #define EPOW_RESET 0 #define EPOW_WARN_COOLING 1 #define EPOW_WARN_POWER 2 #define EPOW_SYSTEM_SHUTDOWN 3 #define EPOW_SYSTEM_HALT 4 #define EPOW_MAIN_ENCLOSURE 5 #define EPOW_POWER_OFF 7
static void rtas_parse_epow_errlog(struct rtas_error_log *log) { struct pseries_errorlog *pseries_log; struct epow_errorlog *epow_log; char action_code; char modifier; pseries_log = get_pseries_errorlog(log, PSERIES_ELOG_SECT_ID_EPOW); if (pseries_log == NULL) return; epow_log = (struct epow_errorlog *)pseries_log->data; action_code = epow_log->sensor_value & 0xF; /* bottom 4 bits */ modifier = epow_log->event_modifier & 0xF; /* bottom 4 bits */ switch (action_code) { case EPOW_RESET: if (num_epow_events) { pr_info("Non critical power/cooling issue cleared\n"); num_epow_events--; } break; case EPOW_WARN_COOLING: pr_info("Non-critical cooling issue detected. Check RTAS error" " log for details\n"); break; case EPOW_WARN_POWER: pr_info("Non-critical power issue detected. Check RTAS error" " log for details\n"); break; case EPOW_SYSTEM_SHUTDOWN: handle_system_shutdown(epow_log->event_modifier); break; case EPOW_SYSTEM_HALT: pr_emerg("Critical power/cooling issue detected. Check RTAS" " error log for details. Powering off.\n"); orderly_poweroff(true); break; case EPOW_MAIN_ENCLOSURE: case EPOW_POWER_OFF: pr_emerg("System about to lose power. Check RTAS error log " " for details. Powering off immediately.\n"); emergency_sync(); kernel_power_off(); break; default: pr_err("Unknown power/cooling event (action code = %d)\n", action_code); } /* Increment epow events counter variable */ if (action_code != EPOW_RESET) num_epow_events++; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard14681.56%250.00%
Vipin K Parashar3217.88%125.00%
liguang10.56%125.00%
Total179100.00%4100.00%


static irqreturn_t ras_hotplug_interrupt(int irq, void *dev_id) { struct pseries_errorlog *pseries_log; struct pseries_hp_errorlog *hp_elog; spin_lock(&ras_log_buf_lock); rtas_call(ras_check_exception_token, 6, 1, NULL, RTAS_VECTOR_EXTERNAL_INTERRUPT, virq_to_hw(irq), RTAS_HOTPLUG_EVENTS, 0, __pa(&ras_log_buf), rtas_get_error_log_max()); pseries_log = get_pseries_errorlog((struct rtas_error_log *)ras_log_buf, PSERIES_ELOG_SECT_ID_HOTPLUG); hp_elog = (struct pseries_hp_errorlog *)pseries_log->data; /* * Since PCI hotplug is not currently supported on pseries, put PCI * hotplug events on the ras_log_buf to be handled by rtas_errd. */ if (hp_elog->resource == PSERIES_HP_ELOG_RESOURCE_MEM || hp_elog->resource == PSERIES_HP_ELOG_RESOURCE_CPU) queue_hotplug_event(hp_elog, NULL, NULL); else log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0); spin_unlock(&ras_log_buf_lock); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
John Allen128100.00%1100.00%
Total128100.00%1100.00%

/* Handle environmental and power warning (EPOW) interrupts. */
static irqreturn_t ras_epow_interrupt(int irq, void *dev_id) { int status; int state; int critical; status = rtas_get_sensor_fast(EPOW_SENSOR_TOKEN, EPOW_SENSOR_INDEX, &state); if (state > 3) critical = 1; /* Time Critical */ else critical = 0; spin_lock(&ras_log_buf_lock); status = rtas_call(ras_check_exception_token, 6, 1, NULL, RTAS_VECTOR_EXTERNAL_INTERRUPT, virq_to_hw(irq), RTAS_EPOW_WARNING, critical, __pa(&ras_log_buf), rtas_get_error_log_max()); log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0); rtas_parse_epow_errlog((struct rtas_error_log *)ras_log_buf); spin_unlock(&ras_log_buf_lock); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard5647.86%428.57%
Paul Mackerras4135.04%321.43%
Andrew Morton108.55%321.43%
David Gibson54.27%17.14%
Grant C. Likely32.56%17.14%
Thomas Huth10.85%17.14%
Mark Nelson10.85%17.14%
Total117100.00%14100.00%

/* * Handle hardware error interrupts. * * RTAS check-exception is called to collect data on the exception. If * the error is deemed recoverable, we log a warning and return. * For nonrecoverable errors, an error is logged and we stop all processing * as quickly as possible in order to prevent propagation of the failure. */
static irqreturn_t ras_error_interrupt(int irq, void *dev_id) { struct rtas_error_log *rtas_elog; int status; int fatal; spin_lock(&ras_log_buf_lock); status = rtas_call(ras_check_exception_token, 6, 1, NULL, RTAS_VECTOR_EXTERNAL_INTERRUPT, virq_to_hw(irq), RTAS_INTERNAL_ERROR, 1 /* Time Critical */, __pa(&ras_log_buf), rtas_get_error_log_max()); rtas_elog = (struct rtas_error_log *)ras_log_buf; if (status == 0 && rtas_error_severity(rtas_elog) >= RTAS_SEVERITY_ERROR_SYNC) fatal = 1; else fatal = 0; /* format and print the extended information */ log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, fatal); if (fatal) { pr_emerg("Fatal hardware error detected. Check RTAS error" " log for details. Powering off immediately\n"); emergency_sync(); kernel_power_off(); } else { pr_err("Recoverable hardware error detected\n"); } spin_unlock(&ras_log_buf_lock); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard7150.71%320.00%
Andrew Morton3525.00%320.00%
Paul Mackerras1913.57%426.67%
David Gibson53.57%16.67%
Vipin K Parashar32.14%16.67%
Greg Kurz32.14%16.67%
Grant C. Likely32.14%16.67%
Mark Nelson10.71%16.67%
Total140100.00%15100.00%

/* * Some versions of FWNMI place the buffer inside the 4kB page starting at * 0x7000. Other versions place it inside the rtas buffer. We check both. */ #define VALID_FWNMI_BUFFER(A) \ ((((A) >= 0x7000) && ((A) < 0x7ff0)) || \ (((A) >= rtas.base) && ((A) < (rtas.base + rtas.size - 16)))) /* * Get the error information for errors coming through the * FWNMI vectors. The pt_regs' r3 will be updated to reflect * the actual r3 if possible, and a ptr to the error log entry * will be returned if found. * * If the RTAS error is not of the extended type, then we put it in a per * cpu 64bit buffer. If it is the extended type we use global_mce_data_buf. * * The global_mce_data_buf does not have any locks or protection around it, * if a second machine check comes in, or a system reset is done * before we have logged the error, then we will get corruption in the * error log. This is preferable over holding off on calling * ibm,nmi-interlock which would result in us checkstopping if a * second machine check did come in. */
static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs) { unsigned long *savep; struct rtas_error_log *h, *errhdr = NULL; /* Mask top two bits */ regs->gpr[3] &= ~(0x3UL << 62); if (!VALID_FWNMI_BUFFER(regs->gpr[3])) { printk(KERN_ERR "FWNMI: corrupt r3 0x%016lx\n", regs->gpr[3]); return NULL; } savep = __va(regs->gpr[3]); regs->gpr[3] = savep[0]; /* restore original r3 */ /* If it isn't an extended log we can use the per cpu 64bit buffer */ h = (struct rtas_error_log *)&savep[1]; if (!rtas_error_extended(h)) { memcpy(this_cpu_ptr(&mce_data_buf), h, sizeof(__u64)); errhdr = (struct rtas_error_log *)this_cpu_ptr(&mce_data_buf); } else { int len, error_log_length; error_log_length = 8 + rtas_error_extended_log_length(h); len = max_t(int, error_log_length, RTAS_ERROR_LOG_MAX); memset(global_mce_data_buf, 0, RTAS_ERROR_LOG_MAX); memcpy(global_mce_data_buf, h, len); errhdr = (struct rtas_error_log *)global_mce_data_buf; } return errhdr; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard10349.05%228.57%
Paul Mackerras7334.76%228.57%
Greg Kurz157.14%114.29%
Mahesh Salgaonkar157.14%114.29%
Christoph Lameter41.90%114.29%
Total210100.00%7100.00%

/* Call this when done with the data returned by FWNMI_get_errinfo. * It will release the saved data area for other CPUs in the * partition to receive FWNMI errors. */
static void fwnmi_release_errinfo(void) { int ret = rtas_call(rtas_token("ibm,nmi-interlock"), 0, 1, NULL); if (ret != 0) printk(KERN_ERR "FWNMI: nmi-interlock failed: %d\n", ret); }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mackerras3897.44%150.00%
Anton Blanchard12.56%150.00%
Total39100.00%2100.00%


int pSeries_system_reset_exception(struct pt_regs *regs) { #ifdef __LITTLE_ENDIAN__ /* * Some firmware byteswaps SRR registers and gives incorrect SRR1. Try * to detect the bad SRR1 pattern here. Flip the NIP back to correct * endian for reporting purposes. Unfortunately the MSR can't be fixed, * so clear it. It will be missing MSR_RI so we won't try to recover. */ if ((be64_to_cpu(regs->msr) & (MSR_LE|MSR_RI|MSR_DR|MSR_IR|MSR_ME|MSR_PR| MSR_ILE|MSR_HV|MSR_SF)) == (MSR_DR|MSR_SF)) { regs->nip = be64_to_cpu((__be64)regs->nip); regs->msr = 0; } #endif if (fwnmi_active) { struct rtas_error_log *errhdr = fwnmi_get_errinfo(regs); if (errhdr) { /* XXX Should look at FWNMI information */ } fwnmi_release_errinfo(); } if (smp_handle_nmi_ipi(regs)) return 1; return 0; /* need to perform reset */ }

Contributors

PersonTokensPropCommitsCommitProp
Nicholas Piggin7565.22%250.00%
Paul Mackerras3530.43%125.00%
Arnd Bergmann54.35%125.00%
Total115100.00%4100.00%

/* * See if we can recover from a machine check exception. * This is only called on power4 (or above) and only via * the Firmware Non-Maskable Interrupts (fwnmi) handler * which provides the error analysis for us. * * Return 1 if corrected (or delivered a signal). * Return 0 if there is nothing we can do. */
static int recover_mce(struct pt_regs *regs, struct rtas_error_log *err) { int recovered = 0; int disposition = rtas_error_disposition(err); if (!(regs->msr & MSR_RI)) { /* If MSR_RI isn't set, we cannot recover */ recovered = 0; } else if (disposition == RTAS_DISP_FULLY_RECOVERED) { /* Platform corrected itself */ recovered = 1; } else if (disposition == RTAS_DISP_LIMITED_RECOVERY) { /* Platform corrected itself but could be degraded */ printk(KERN_ERR "MCE: limited recovery, system may " "be degraded\n"); recovered = 1; } else if (user_mode(regs) && !is_global_init(current) && rtas_error_severity(err) == RTAS_SEVERITY_ERROR_SYNC) { /* * If we received a synchronous error when in userspace * kill the task. Firmware may report details of the fail * asynchronously, so we can't rely on the target and type * fields being valid here. */ printk(KERN_ERR "MCE: uncorrectable error, killing task " "%s:%d\n", current->comm, current->pid); _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); recovered = 1; } log_error((char *)err, ERR_TYPE_RTAS_LOG, 0); return recovered; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mackerras8353.90%228.57%
Anton Blanchard5737.01%228.57%
Greg Kurz117.14%114.29%
Sukadev Bhattiprolu21.30%114.29%
Serge E. Hallyn10.65%114.29%
Total154100.00%7100.00%

/* * Handle a machine check. * * Note that on Power 4 and beyond Firmware Non-Maskable Interrupts (fwnmi) * should be present. If so the handler which called us tells us if the * error was recovered (never true if RI=0). * * On hardware prior to Power 4 these exceptions were asynchronous which * means we can't tell exactly where it occurred and so we can't recover. */
int pSeries_machine_check_exception(struct pt_regs *regs) { struct rtas_error_log *errp; if (fwnmi_active) { errp = fwnmi_get_errinfo(regs); fwnmi_release_errinfo(); if (errp && recover_mce(regs, errp)) return 1; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mackerras48100.00%2100.00%
Total48100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard66043.11%1327.66%
Paul Mackerras42327.63%714.89%
John Allen17011.10%12.13%
Nicholas Piggin754.90%24.26%
Andrew Morton523.40%48.51%
Vipin K Parashar483.14%12.13%
Greg Kurz291.89%12.13%
Mahesh Salgaonkar150.98%12.13%
David Gibson120.78%12.13%
Anshuman Khandual70.46%12.13%
Michael Ellerman70.46%510.64%
Arnd Bergmann70.46%12.13%
Grant C. Likely60.39%12.13%
Thomas Gleixner40.26%12.13%
Mark Nelson40.26%24.26%
Christoph Lameter40.26%12.13%
liguang40.26%12.13%
Sukadev Bhattiprolu20.13%12.13%
Thomas Huth10.07%12.13%
Serge E. Hallyn10.07%12.13%
David Howells0.00%00.00%
Total1531100.00%47100.00%
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