1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
357 lines
10 KiB
C
357 lines
10 KiB
C
/*
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* ras.c
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* Copyright (C) 2001 Dave Engebretsen IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Change Activity:
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* 2001/09/21 : engebret : Created with minimal EPOW and HW exception support.
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* End Change Activity
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*/
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#include <linux/errno.h>
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#include <linux/threads.h>
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#include <linux/kernel_stat.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/timex.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/random.h>
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#include <linux/sysrq.h>
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#include <linux/bitops.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/irq.h>
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#include <asm/cache.h>
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#include <asm/prom.h>
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#include <asm/ptrace.h>
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#include <asm/iSeries/LparData.h>
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#include <asm/machdep.h>
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#include <asm/rtas.h>
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#include <asm/ppcdebug.h>
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static unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX];
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static DEFINE_SPINLOCK(ras_log_buf_lock);
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char mce_data_buf[RTAS_ERROR_LOG_MAX]
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;
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/* This is true if we are using the firmware NMI handler (typically LPAR) */
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extern int fwnmi_active;
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extern void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);
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static int ras_get_sensor_state_token;
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static int ras_check_exception_token;
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#define EPOW_SENSOR_TOKEN 9
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#define EPOW_SENSOR_INDEX 0
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#define RAS_VECTOR_OFFSET 0x500
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static irqreturn_t ras_epow_interrupt(int irq, void *dev_id,
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struct pt_regs * regs);
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static irqreturn_t ras_error_interrupt(int irq, void *dev_id,
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struct pt_regs * regs);
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/* #define DEBUG */
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static void request_ras_irqs(struct device_node *np, char *propname,
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irqreturn_t (*handler)(int, void *, struct pt_regs *),
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const char *name)
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{
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unsigned int *ireg, len, i;
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int virq, n_intr;
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ireg = (unsigned int *)get_property(np, propname, &len);
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if (ireg == NULL)
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return;
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n_intr = prom_n_intr_cells(np);
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len /= n_intr * sizeof(*ireg);
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for (i = 0; i < len; i++) {
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virq = virt_irq_create_mapping(*ireg);
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if (virq == NO_IRQ) {
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printk(KERN_ERR "Unable to allocate interrupt "
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"number for %s\n", np->full_name);
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return;
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}
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if (request_irq(irq_offset_up(virq), handler, 0, name, NULL)) {
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printk(KERN_ERR "Unable to request interrupt %d for "
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"%s\n", irq_offset_up(virq), np->full_name);
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return;
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}
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ireg += n_intr;
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}
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}
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/*
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* Initialize handlers for the set of interrupts caused by hardware errors
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* and power system events.
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*/
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static int __init init_ras_IRQ(void)
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{
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struct device_node *np;
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ras_get_sensor_state_token = rtas_token("get-sensor-state");
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ras_check_exception_token = rtas_token("check-exception");
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/* Internal Errors */
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np = of_find_node_by_path("/event-sources/internal-errors");
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if (np != NULL) {
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request_ras_irqs(np, "open-pic-interrupt", ras_error_interrupt,
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"RAS_ERROR");
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request_ras_irqs(np, "interrupts", ras_error_interrupt,
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"RAS_ERROR");
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of_node_put(np);
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}
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/* EPOW Events */
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np = of_find_node_by_path("/event-sources/epow-events");
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if (np != NULL) {
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request_ras_irqs(np, "open-pic-interrupt", ras_epow_interrupt,
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"RAS_EPOW");
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request_ras_irqs(np, "interrupts", ras_epow_interrupt,
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"RAS_EPOW");
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of_node_put(np);
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}
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return 1;
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}
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__initcall(init_ras_IRQ);
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/*
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* Handle power subsystem events (EPOW).
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*
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* Presently we just log the event has occurred. This should be fixed
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* to examine the type of power failure and take appropriate action where
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* the time horizon permits something useful to be done.
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*/
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static irqreturn_t
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ras_epow_interrupt(int irq, void *dev_id, struct pt_regs * regs)
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{
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int status = 0xdeadbeef;
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int state = 0;
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int critical;
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status = rtas_call(ras_get_sensor_state_token, 2, 2, &state,
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EPOW_SENSOR_TOKEN, EPOW_SENSOR_INDEX);
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if (state > 3)
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critical = 1; /* Time Critical */
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else
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critical = 0;
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spin_lock(&ras_log_buf_lock);
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status = rtas_call(ras_check_exception_token, 6, 1, NULL,
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RAS_VECTOR_OFFSET,
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virt_irq_to_real(irq_offset_down(irq)),
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RTAS_EPOW_WARNING | RTAS_POWERMGM_EVENTS,
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critical, __pa(&ras_log_buf),
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rtas_get_error_log_max());
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udbg_printf("EPOW <0x%lx 0x%x 0x%x>\n",
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*((unsigned long *)&ras_log_buf), status, state);
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printk(KERN_WARNING "EPOW <0x%lx 0x%x 0x%x>\n",
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*((unsigned long *)&ras_log_buf), status, state);
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/* format and print the extended information */
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log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0);
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spin_unlock(&ras_log_buf_lock);
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return IRQ_HANDLED;
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}
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/*
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* Handle hardware error interrupts.
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*
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* RTAS check-exception is called to collect data on the exception. If
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* the error is deemed recoverable, we log a warning and return.
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* For nonrecoverable errors, an error is logged and we stop all processing
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* as quickly as possible in order to prevent propagation of the failure.
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*/
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static irqreturn_t
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ras_error_interrupt(int irq, void *dev_id, struct pt_regs * regs)
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{
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struct rtas_error_log *rtas_elog;
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int status = 0xdeadbeef;
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int fatal;
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spin_lock(&ras_log_buf_lock);
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status = rtas_call(ras_check_exception_token, 6, 1, NULL,
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RAS_VECTOR_OFFSET,
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virt_irq_to_real(irq_offset_down(irq)),
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RTAS_INTERNAL_ERROR, 1 /*Time Critical */,
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__pa(&ras_log_buf),
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rtas_get_error_log_max());
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rtas_elog = (struct rtas_error_log *)ras_log_buf;
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if ((status == 0) && (rtas_elog->severity >= RTAS_SEVERITY_ERROR_SYNC))
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fatal = 1;
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else
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fatal = 0;
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/* format and print the extended information */
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log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, fatal);
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if (fatal) {
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udbg_printf("Fatal HW Error <0x%lx 0x%x>\n",
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*((unsigned long *)&ras_log_buf), status);
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printk(KERN_EMERG "Error: Fatal hardware error <0x%lx 0x%x>\n",
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*((unsigned long *)&ras_log_buf), status);
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#ifndef DEBUG
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/* Don't actually power off when debugging so we can test
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* without actually failing while injecting errors.
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* Error data will not be logged to syslog.
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*/
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ppc_md.power_off();
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#endif
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} else {
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udbg_printf("Recoverable HW Error <0x%lx 0x%x>\n",
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*((unsigned long *)&ras_log_buf), status);
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printk(KERN_WARNING
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"Warning: Recoverable hardware error <0x%lx 0x%x>\n",
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*((unsigned long *)&ras_log_buf), status);
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}
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spin_unlock(&ras_log_buf_lock);
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return IRQ_HANDLED;
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}
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/* Get the error information for errors coming through the
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* FWNMI vectors. The pt_regs' r3 will be updated to reflect
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* the actual r3 if possible, and a ptr to the error log entry
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* will be returned if found.
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*
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* The mce_data_buf does not have any locks or protection around it,
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* if a second machine check comes in, or a system reset is done
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* before we have logged the error, then we will get corruption in the
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* error log. This is preferable over holding off on calling
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* ibm,nmi-interlock which would result in us checkstopping if a
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* second machine check did come in.
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*/
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static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs)
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{
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unsigned long errdata = regs->gpr[3];
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struct rtas_error_log *errhdr = NULL;
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unsigned long *savep;
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if ((errdata >= 0x7000 && errdata < 0x7fff0) ||
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(errdata >= rtas.base && errdata < rtas.base + rtas.size - 16)) {
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savep = __va(errdata);
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regs->gpr[3] = savep[0]; /* restore original r3 */
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memset(mce_data_buf, 0, RTAS_ERROR_LOG_MAX);
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memcpy(mce_data_buf, (char *)(savep + 1), RTAS_ERROR_LOG_MAX);
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errhdr = (struct rtas_error_log *)mce_data_buf;
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} else {
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printk("FWNMI: corrupt r3\n");
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}
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return errhdr;
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}
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/* Call this when done with the data returned by FWNMI_get_errinfo.
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* It will release the saved data area for other CPUs in the
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* partition to receive FWNMI errors.
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*/
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static void fwnmi_release_errinfo(void)
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{
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int ret = rtas_call(rtas_token("ibm,nmi-interlock"), 0, 1, NULL);
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if (ret != 0)
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printk("FWNMI: nmi-interlock failed: %d\n", ret);
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}
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void pSeries_system_reset_exception(struct pt_regs *regs)
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{
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if (fwnmi_active) {
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struct rtas_error_log *errhdr = fwnmi_get_errinfo(regs);
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if (errhdr) {
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/* XXX Should look at FWNMI information */
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}
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fwnmi_release_errinfo();
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}
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}
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/*
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* See if we can recover from a machine check exception.
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* This is only called on power4 (or above) and only via
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* the Firmware Non-Maskable Interrupts (fwnmi) handler
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* which provides the error analysis for us.
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*
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* Return 1 if corrected (or delivered a signal).
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* Return 0 if there is nothing we can do.
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*/
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static int recover_mce(struct pt_regs *regs, struct rtas_error_log * err)
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{
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int nonfatal = 0;
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if (err->disposition == RTAS_DISP_FULLY_RECOVERED) {
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/* Platform corrected itself */
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nonfatal = 1;
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} else if ((regs->msr & MSR_RI) &&
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user_mode(regs) &&
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err->severity == RTAS_SEVERITY_ERROR_SYNC &&
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err->disposition == RTAS_DISP_NOT_RECOVERED &&
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err->target == RTAS_TARGET_MEMORY &&
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err->type == RTAS_TYPE_ECC_UNCORR &&
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!(current->pid == 0 || current->pid == 1)) {
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/* Kill off a user process with an ECC error */
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printk(KERN_ERR "MCE: uncorrectable ecc error for pid %d\n",
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current->pid);
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/* XXX something better for ECC error? */
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_exception(SIGBUS, regs, BUS_ADRERR, regs->nip);
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nonfatal = 1;
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}
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log_error((char *)err, ERR_TYPE_RTAS_LOG, !nonfatal);
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return nonfatal;
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}
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/*
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* Handle a machine check.
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*
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* Note that on Power 4 and beyond Firmware Non-Maskable Interrupts (fwnmi)
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* should be present. If so the handler which called us tells us if the
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* error was recovered (never true if RI=0).
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*
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* On hardware prior to Power 4 these exceptions were asynchronous which
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* means we can't tell exactly where it occurred and so we can't recover.
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*/
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int pSeries_machine_check_exception(struct pt_regs *regs)
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{
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struct rtas_error_log *errp;
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if (fwnmi_active) {
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errp = fwnmi_get_errinfo(regs);
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fwnmi_release_errinfo();
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if (errp && recover_mce(regs, errp))
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return 1;
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}
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return 0;
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}
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