/* * 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/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 <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 unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX];static spinlock_t ras_log_buf_lock = SPIN_LOCK_UNLOCKED;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	0x500static 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_tras_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_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_tras_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_ERROR_LOG_MAX);	rtas_elog = (struct rtas_error_log *)ras_log_buf;	if ((status == 0) && (rtas_elog->severity >= 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;}