| /* |
| * 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 |
| */ |
| |
| /* Change Activity: |
| * 2001/09/21 : engebret : Created with minimal EPOW and HW exception support. |
| * End Change Activity |
| */ |
| |
| #include <linux/errno.h> |
| #include <linux/threads.h> |
| #include <linux/kernel_stat.h> |
| #include <linux/signal.h> |
| #include <linux/sched.h> |
| #include <linux/ioport.h> |
| #include <linux/interrupt.h> |
| #include <linux/timex.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/pci.h> |
| #include <linux/delay.h> |
| #include <linux/irq.h> |
| #include <linux/random.h> |
| #include <linux/sysrq.h> |
| #include <linux/bitops.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/system.h> |
| #include <asm/io.h> |
| #include <asm/pgtable.h> |
| #include <asm/irq.h> |
| #include <asm/cache.h> |
| #include <asm/prom.h> |
| #include <asm/ptrace.h> |
| #include <asm/machdep.h> |
| #include <asm/rtas.h> |
| #include <asm/udbg.h> |
| #include <asm/firmware.h> |
| |
| static unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX]; |
| static DEFINE_SPINLOCK(ras_log_buf_lock); |
| |
| char mce_data_buf[RTAS_ERROR_LOG_MAX]; |
| |
| static int ras_get_sensor_state_token; |
| static int ras_check_exception_token; |
| |
| #define EPOW_SENSOR_TOKEN 9 |
| #define EPOW_SENSOR_INDEX 0 |
| #define RAS_VECTOR_OFFSET 0x500 |
| |
| static irqreturn_t ras_epow_interrupt(int irq, void *dev_id, |
| struct pt_regs * regs); |
| static irqreturn_t ras_error_interrupt(int irq, void *dev_id, |
| struct pt_regs * regs); |
| |
| /* #define DEBUG */ |
| |
| static void request_ras_irqs(struct device_node *np, char *propname, |
| irqreturn_t (*handler)(int, void *, struct pt_regs *), |
| const char *name) |
| { |
| unsigned int *ireg, len, i; |
| int virq, n_intr; |
| |
| ireg = (unsigned int *)get_property(np, propname, &len); |
| if (ireg == NULL) |
| return; |
| n_intr = prom_n_intr_cells(np); |
| len /= n_intr * sizeof(*ireg); |
| |
| for (i = 0; i < len; i++) { |
| virq = virt_irq_create_mapping(*ireg); |
| if (virq == NO_IRQ) { |
| printk(KERN_ERR "Unable to allocate interrupt " |
| "number for %s\n", np->full_name); |
| return; |
| } |
| if (request_irq(irq_offset_up(virq), handler, 0, name, NULL)) { |
| printk(KERN_ERR "Unable to request interrupt %d for " |
| "%s\n", irq_offset_up(virq), np->full_name); |
| return; |
| } |
| ireg += n_intr; |
| } |
| } |
| |
| /* |
| * 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_get_sensor_state_token = rtas_token("get-sensor-state"); |
| ras_check_exception_token = rtas_token("check-exception"); |
| |
| /* Internal Errors */ |
| np = of_find_node_by_path("/event-sources/internal-errors"); |
| if (np != NULL) { |
| request_ras_irqs(np, "open-pic-interrupt", ras_error_interrupt, |
| "RAS_ERROR"); |
| request_ras_irqs(np, "interrupts", ras_error_interrupt, |
| "RAS_ERROR"); |
| of_node_put(np); |
| } |
| |
| /* EPOW Events */ |
| np = of_find_node_by_path("/event-sources/epow-events"); |
| if (np != NULL) { |
| request_ras_irqs(np, "open-pic-interrupt", ras_epow_interrupt, |
| "RAS_EPOW"); |
| request_ras_irqs(np, "interrupts", ras_epow_interrupt, |
| "RAS_EPOW"); |
| of_node_put(np); |
| } |
| |
| return 1; |
| } |
| __initcall(init_ras_IRQ); |
| |
| /* |
| * Handle power subsystem events (EPOW). |
| * |
| * Presently we just log the event has occurred. This should be fixed |
| * to examine the type of power failure and take appropriate action where |
| * the time horizon permits something useful to be done. |
| */ |
| static irqreturn_t |
| ras_epow_interrupt(int irq, void *dev_id, struct pt_regs * regs) |
| { |
| int status = 0xdeadbeef; |
| int state = 0; |
| int critical; |
| |
| status = rtas_call(ras_get_sensor_state_token, 2, 2, &state, |
| EPOW_SENSOR_TOKEN, EPOW_SENSOR_INDEX); |
| |
| 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, |
| RAS_VECTOR_OFFSET, |
| virt_irq_to_real(irq_offset_down(irq)), |
| RTAS_EPOW_WARNING | RTAS_POWERMGM_EVENTS, |
| critical, __pa(&ras_log_buf), |
| rtas_get_error_log_max()); |
| |
| udbg_printf("EPOW <0x%lx 0x%x 0x%x>\n", |
| *((unsigned long *)&ras_log_buf), status, state); |
| printk(KERN_WARNING "EPOW <0x%lx 0x%x 0x%x>\n", |
| *((unsigned long *)&ras_log_buf), status, state); |
| |
| /* format and print the extended information */ |
| log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0); |
| |
| spin_unlock(&ras_log_buf_lock); |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * 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 pt_regs * regs) |
| { |
| struct rtas_error_log *rtas_elog; |
| int status = 0xdeadbeef; |
| int fatal; |
| |
| spin_lock(&ras_log_buf_lock); |
| |
| status = rtas_call(ras_check_exception_token, 6, 1, NULL, |
| RAS_VECTOR_OFFSET, |
| virt_irq_to_real(irq_offset_down(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_elog->severity >= 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) { |
| udbg_printf("Fatal HW Error <0x%lx 0x%x>\n", |
| *((unsigned long *)&ras_log_buf), status); |
| printk(KERN_EMERG "Error: Fatal hardware error <0x%lx 0x%x>\n", |
| *((unsigned long *)&ras_log_buf), status); |
| |
| #ifndef DEBUG |
| /* Don't actually power off when debugging so we can test |
| * without actually failing while injecting errors. |
| * Error data will not be logged to syslog. |
| */ |
| ppc_md.power_off(); |
| #endif |
| } else { |
| udbg_printf("Recoverable HW Error <0x%lx 0x%x>\n", |
| *((unsigned long *)&ras_log_buf), status); |
| printk(KERN_WARNING |
| "Warning: Recoverable hardware error <0x%lx 0x%x>\n", |
| *((unsigned long *)&ras_log_buf), status); |
| } |
| |
| spin_unlock(&ras_log_buf_lock); |
| return IRQ_HANDLED; |
| } |
| |
| /* 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. |
| * |
| * The 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 errdata = regs->gpr[3]; |
| struct rtas_error_log *errhdr = NULL; |
| unsigned long *savep; |
| |
| if ((errdata >= 0x7000 && errdata < 0x7fff0) || |
| (errdata >= rtas.base && errdata < rtas.base + rtas.size - 16)) { |
| savep = __va(errdata); |
| regs->gpr[3] = savep[0]; /* restore original r3 */ |
| memset(mce_data_buf, 0, RTAS_ERROR_LOG_MAX); |
| memcpy(mce_data_buf, (char *)(savep + 1), RTAS_ERROR_LOG_MAX); |
| errhdr = (struct rtas_error_log *)mce_data_buf; |
| } else { |
| printk("FWNMI: corrupt r3\n"); |
| } |
| return errhdr; |
| } |
| |
| /* 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("FWNMI: nmi-interlock failed: %d\n", ret); |
| } |
| |
| void pSeries_system_reset_exception(struct pt_regs *regs) |
| { |
| if (fwnmi_active) { |
| struct rtas_error_log *errhdr = fwnmi_get_errinfo(regs); |
| if (errhdr) { |
| /* XXX Should look at FWNMI information */ |
| } |
| fwnmi_release_errinfo(); |
| } |
| } |
| |
| /* |
| * 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 nonfatal = 0; |
| |
| if (err->disposition == RTAS_DISP_FULLY_RECOVERED) { |
| /* Platform corrected itself */ |
| nonfatal = 1; |
| } else if ((regs->msr & MSR_RI) && |
| user_mode(regs) && |
| err->severity == RTAS_SEVERITY_ERROR_SYNC && |
| err->disposition == RTAS_DISP_NOT_RECOVERED && |
| err->target == RTAS_TARGET_MEMORY && |
| err->type == RTAS_TYPE_ECC_UNCORR && |
| !(current->pid == 0 || current->pid == 1)) { |
| /* Kill off a user process with an ECC error */ |
| printk(KERN_ERR "MCE: uncorrectable ecc error for pid %d\n", |
| current->pid); |
| /* XXX something better for ECC error? */ |
| _exception(SIGBUS, regs, BUS_ADRERR, regs->nip); |
| nonfatal = 1; |
| } |
| |
| log_error((char *)err, ERR_TYPE_RTAS_LOG, !nonfatal); |
| |
| return nonfatal; |
| } |
| |
| /* |
| * 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; |
| } |