ras.c
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- /*
- * 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
- */
- /* Change Activity:
- * 2001/09/21 : engebret : Created with minimal EPOW and HW exception support.
- * End Change Activity
- */
- #include <linux/ptrace.h>
- #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/proc_fs.h>
- #include <linux/random.h>
- #include <linux/sysrq.h>
- #include <asm/uaccess.h>
- #include <asm/bitops.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/iSeries/LparData.h>
- #include <asm/machdep.h>
- #include <asm/rtas.h>
- #include <asm/ppcdebug.h>
- static void ras_epow_interrupt(int irq, void *dev_id, struct pt_regs * regs);
- static void ras_error_interrupt(int irq, void *dev_id, struct pt_regs * regs);
- void init_ras_IRQ(void);
- /* #define DEBUG */
- /*
- * Initialize handlers for the set of interrupts caused by hardware errors
- * and power system events.
- */
- void init_ras_IRQ(void) {
- struct device_node *np;
- unsigned int *ireg, len, i;
- if((np = find_path_device("/event-sources/internal-errors")) &&
- (ireg = (unsigned int *)get_property(np, "open-pic-interrupt",
- &len))) {
- for(i=0; i<(len / sizeof(*ireg)); i++) {
- request_irq(virt_irq_create_mapping(*(ireg)) + NUM_8259_INTERRUPTS,
- &ras_error_interrupt, 0,
- "RAS_ERROR", NULL);
- ireg++;
- }
- }
- if((np = find_path_device("/event-sources/epow-events")) &&
- (ireg = (unsigned int *)get_property(np, "open-pic-interrupt",
- &len))) {
- for(i=0; i<(len / sizeof(*ireg)); i++) {
- request_irq(virt_irq_create_mapping(*(ireg)) + NUM_8259_INTERRUPTS,
- &ras_epow_interrupt, 0,
- "RAS_EPOW", NULL);
- ireg++;
- }
- }
- }
- /*
- * Handle power subsystem events (EPOW).
- *
- * Presently we just log the event has occured. 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 void
- ras_epow_interrupt(int irq, void *dev_id, struct pt_regs * regs)
- {
- struct rtas_error_log log_entry;
- unsigned int size = sizeof(log_entry);
- long status = 0xdeadbeef;
- status = rtas_call(rtas_token("check-exception"), 6, 1, NULL,
- 0x500, irq,
- EPOW_WARNING | POWERMGM_EVENTS,
- 1, /* Time Critical */
- __pa(&log_entry), size);
- udbg_printf("EPOW <0x%lx 0x%lx>n",
- *((unsigned long *)&log_entry), status);
- printk(KERN_WARNING
- "EPOW <0x%lx 0x%lx>n",*((unsigned long *)&log_entry), status);
- }
- /*
- * 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 void
- ras_error_interrupt(int irq, void *dev_id, struct pt_regs * regs)
- {
- struct rtas_error_log log_entry;
- unsigned int size = sizeof(log_entry);
- long status = 0xdeadbeef;
- status = rtas_call(rtas_token("check-exception"), 6, 1, NULL,
- 0x500, irq,
- INTERNAL_ERROR,
- 1, /* Time Critical */
- __pa(&log_entry), size);
- if((status != 1) &&
- (log_entry.severity >= SEVERITY_ERROR_SYNC)) {
- udbg_printf("HW Error <0x%lx 0x%lx>n",
- *((unsigned long *)&log_entry), status);
- printk(KERN_EMERG
- "Error: Fatal hardware error <0x%lx 0x%lx>n",
- *((unsigned long *)&log_entry), status);
- #ifndef DEBUG
- /* Don't actually power off when debugging so we can test
- * without actually failing while injecting errors.
- */
- ppc_md.power_off();
- #endif
- } else {
- udbg_printf("Recoverable HW Error <0x%lx 0x%lx>n",
- *((unsigned long *)&log_entry), status);
- printk(KERN_WARNING
- "Warning: Recoverable hardware error <0x%lx 0x%lx>n",
- *((unsigned long *)&log_entry), status);
- return;
- }
- }