2005-04-17 05:20:36 +07:00
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/*
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* drivers/s390/s390mach.c
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* S/390 machine check handler
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*
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* S390 version
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* Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Ingo Adlung (adlung@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/workqueue.h>
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2006-05-02 02:16:14 +07:00
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#include <linux/time.h>
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2006-06-29 20:03:17 +07:00
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#include <linux/kthread.h>
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2005-04-17 05:20:36 +07:00
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#include <asm/lowcore.h>
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#include "s390mach.h"
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static struct semaphore m_sem;
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2006-01-06 15:19:25 +07:00
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extern int css_process_crw(int, int);
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2005-04-17 05:20:36 +07:00
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extern int chsc_process_crw(void);
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extern int chp_process_crw(int, int);
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extern void css_reiterate_subchannels(void);
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extern struct workqueue_struct *slow_path_wq;
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extern struct work_struct slow_path_work;
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2005-06-26 04:55:30 +07:00
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static NORET_TYPE void
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2005-04-17 05:20:36 +07:00
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s390_handle_damage(char *msg)
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{
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#ifdef CONFIG_SMP
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smp_send_stop();
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#endif
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disabled_wait((unsigned long) __builtin_return_address(0));
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2005-06-26 04:55:30 +07:00
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for(;;);
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2005-04-17 05:20:36 +07:00
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}
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/*
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* Retrieve CRWs and call function to handle event.
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*
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* Note : we currently process CRWs for io and chsc subchannels only
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*/
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static int
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s390_collect_crw_info(void *param)
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{
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2006-01-06 15:19:25 +07:00
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struct crw crw[2];
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2005-04-17 05:20:36 +07:00
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int ccode, ret, slow;
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struct semaphore *sem;
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2006-01-06 15:19:25 +07:00
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unsigned int chain;
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2005-04-17 05:20:36 +07:00
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sem = (struct semaphore *)param;
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repeat:
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down_interruptible(sem);
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slow = 0;
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2006-01-06 15:19:25 +07:00
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chain = 0;
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2005-04-17 05:20:36 +07:00
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while (1) {
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2006-01-06 15:19:25 +07:00
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if (unlikely(chain > 1)) {
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struct crw tmp_crw;
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printk(KERN_WARNING"%s: Code does not support more "
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"than two chained crws; please report to "
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"linux390@de.ibm.com!\n", __FUNCTION__);
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ccode = stcrw(&tmp_crw);
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printk(KERN_WARNING"%s: crw reports slct=%d, oflw=%d, "
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"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
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__FUNCTION__, tmp_crw.slct, tmp_crw.oflw,
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tmp_crw.chn, tmp_crw.rsc, tmp_crw.anc,
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tmp_crw.erc, tmp_crw.rsid);
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printk(KERN_WARNING"%s: This was crw number %x in the "
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"chain\n", __FUNCTION__, chain);
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if (ccode != 0)
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break;
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chain = tmp_crw.chn ? chain + 1 : 0;
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continue;
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}
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ccode = stcrw(&crw[chain]);
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2005-04-17 05:20:36 +07:00
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if (ccode != 0)
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break;
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2006-09-20 20:59:47 +07:00
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printk(KERN_DEBUG "crw_info : CRW reports slct=%d, oflw=%d, "
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"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
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crw[chain].slct, crw[chain].oflw, crw[chain].chn,
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crw[chain].rsc, crw[chain].anc, crw[chain].erc,
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crw[chain].rsid);
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2005-04-17 05:20:36 +07:00
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/* Check for overflows. */
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2006-01-06 15:19:25 +07:00
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if (crw[chain].oflw) {
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2005-04-17 05:20:36 +07:00
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pr_debug("%s: crw overflow detected!\n", __FUNCTION__);
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css_reiterate_subchannels();
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2006-01-06 15:19:25 +07:00
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chain = 0;
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2005-04-17 05:20:36 +07:00
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slow = 1;
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continue;
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}
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2006-01-06 15:19:25 +07:00
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switch (crw[chain].rsc) {
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2005-04-17 05:20:36 +07:00
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case CRW_RSC_SCH:
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2006-01-06 15:19:25 +07:00
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if (crw[0].chn && !chain)
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break;
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pr_debug("source is subchannel %04X\n", crw[0].rsid);
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ret = css_process_crw (crw[0].rsid,
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chain ? crw[1].rsid : 0);
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2005-04-17 05:20:36 +07:00
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if (ret == -EAGAIN)
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slow = 1;
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break;
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case CRW_RSC_MONITOR:
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pr_debug("source is monitoring facility\n");
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break;
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case CRW_RSC_CPATH:
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2006-01-06 15:19:25 +07:00
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pr_debug("source is channel path %02X\n", crw[0].rsid);
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2006-07-12 21:40:19 +07:00
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/*
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* Check for solicited machine checks. These are
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* created by reset channel path and need not be
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* reported to the common I/O layer.
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*/
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if (crw[chain].slct) {
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2006-09-20 20:59:47 +07:00
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pr_debug("solicited machine check for "
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"channel path %02X\n", crw[0].rsid);
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2006-07-12 21:40:19 +07:00
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break;
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}
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2006-01-06 15:19:25 +07:00
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switch (crw[0].erc) {
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2005-04-17 05:20:36 +07:00
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case CRW_ERC_IPARM: /* Path has come. */
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2006-01-06 15:19:25 +07:00
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ret = chp_process_crw(crw[0].rsid, 1);
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2005-04-17 05:20:36 +07:00
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break;
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case CRW_ERC_PERRI: /* Path has gone. */
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case CRW_ERC_PERRN:
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2006-01-06 15:19:25 +07:00
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ret = chp_process_crw(crw[0].rsid, 0);
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2005-04-17 05:20:36 +07:00
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break;
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default:
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pr_debug("Don't know how to handle erc=%x\n",
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2006-01-06 15:19:25 +07:00
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crw[0].erc);
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2005-04-17 05:20:36 +07:00
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ret = 0;
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}
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if (ret == -EAGAIN)
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slow = 1;
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break;
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case CRW_RSC_CONFIG:
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pr_debug("source is configuration-alert facility\n");
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break;
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case CRW_RSC_CSS:
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pr_debug("source is channel subsystem\n");
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ret = chsc_process_crw();
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if (ret == -EAGAIN)
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slow = 1;
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break;
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default:
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pr_debug("unknown source\n");
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break;
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}
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2006-01-06 15:19:25 +07:00
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/* chain is always 0 or 1 here. */
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chain = crw[chain].chn ? chain + 1 : 0;
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2005-04-17 05:20:36 +07:00
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}
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if (slow)
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queue_work(slow_path_wq, &slow_path_work);
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goto repeat;
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return 0;
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}
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2005-06-26 04:55:30 +07:00
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struct mcck_struct {
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int kill_task;
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int channel_report;
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int warning;
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unsigned long long mcck_code;
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};
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static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck);
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2005-04-17 05:20:36 +07:00
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/*
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2005-06-26 04:55:30 +07:00
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* Main machine check handler function. Will be called with interrupts enabled
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* or disabled and machine checks enabled or disabled.
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2005-04-17 05:20:36 +07:00
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*/
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void
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2005-06-26 04:55:30 +07:00
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s390_handle_mcck(void)
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2005-04-17 05:20:36 +07:00
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{
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2005-06-26 04:55:30 +07:00
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unsigned long flags;
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struct mcck_struct mcck;
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2005-04-17 05:20:36 +07:00
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2005-06-26 04:55:30 +07:00
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/*
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* Disable machine checks and get the current state of accumulated
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* machine checks. Afterwards delete the old state and enable machine
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* checks again.
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*/
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local_irq_save(flags);
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local_mcck_disable();
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mcck = __get_cpu_var(cpu_mcck);
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memset(&__get_cpu_var(cpu_mcck), 0, sizeof(struct mcck_struct));
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clear_thread_flag(TIF_MCCK_PENDING);
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local_mcck_enable();
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local_irq_restore(flags);
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2005-04-17 05:20:36 +07:00
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2005-06-26 04:55:30 +07:00
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if (mcck.channel_report)
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2005-04-17 05:20:36 +07:00
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up(&m_sem);
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#ifdef CONFIG_MACHCHK_WARNING
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/*
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* The warning may remain for a prolonged period on the bare iron.
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* (actually till the machine is powered off, or until the problem is gone)
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* So we just stop listening for the WARNING MCH and prevent continuously
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* being interrupted. One caveat is however, that we must do this per
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* processor and cannot use the smp version of ctl_clear_bit().
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* On VM we only get one interrupt per virtally presented machinecheck.
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* Though one suffices, we may get one interrupt per (virtual) processor.
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*/
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2005-06-26 04:55:30 +07:00
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if (mcck.warning) { /* WARNING pending ? */
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2005-04-17 05:20:36 +07:00
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static int mchchk_wng_posted = 0;
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/*
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* Use single machine clear, as we cannot handle smp right now
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*/
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__ctl_clear_bit(14, 24); /* Disable WARNING MCH */
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if (xchg(&mchchk_wng_posted, 1) == 0)
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2006-10-02 16:19:00 +07:00
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kill_cad_pid(SIGPWR, 1);
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2005-04-17 05:20:36 +07:00
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}
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#endif
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2005-06-26 04:55:30 +07:00
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if (mcck.kill_task) {
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local_irq_enable();
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printk(KERN_EMERG "mcck: Terminating task because of machine "
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"malfunction (code 0x%016llx).\n", mcck.mcck_code);
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printk(KERN_EMERG "mcck: task: %s, pid: %d.\n",
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current->comm, current->pid);
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do_exit(SIGSEGV);
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}
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}
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/*
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* returns 0 if all registers could be validated
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* returns 1 otherwise
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*/
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static int
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s390_revalidate_registers(struct mci *mci)
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{
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int kill_task;
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u64 tmpclock;
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u64 zero;
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void *fpt_save_area, *fpt_creg_save_area;
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kill_task = 0;
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zero = 0;
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/* General purpose registers */
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if (!mci->gr)
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/*
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* General purpose registers couldn't be restored and have
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* unknown contents. Process needs to be terminated.
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*/
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kill_task = 1;
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/* Revalidate floating point registers */
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if (!mci->fp)
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/*
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* Floating point registers can't be restored and
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* therefore the process needs to be terminated.
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*/
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kill_task = 1;
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2006-01-06 15:19:28 +07:00
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#ifndef CONFIG_64BIT
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2006-09-28 21:56:43 +07:00
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asm volatile(
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" ld 0,0(%0)\n"
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" ld 2,8(%0)\n"
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" ld 4,16(%0)\n"
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" ld 6,24(%0)"
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: : "a" (&S390_lowcore.floating_pt_save_area));
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2005-06-26 04:55:30 +07:00
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#endif
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if (MACHINE_HAS_IEEE) {
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2006-01-06 15:19:28 +07:00
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#ifdef CONFIG_64BIT
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2005-06-26 04:55:30 +07:00
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fpt_save_area = &S390_lowcore.floating_pt_save_area;
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fpt_creg_save_area = &S390_lowcore.fpt_creg_save_area;
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#else
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fpt_save_area = (void *) S390_lowcore.extended_save_area_addr;
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fpt_creg_save_area = fpt_save_area+128;
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#endif
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/* Floating point control register */
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if (!mci->fc) {
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/*
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* Floating point control register can't be restored.
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* Task will be terminated.
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*/
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2006-09-28 21:56:43 +07:00
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asm volatile("lfpc 0(%0)" : : "a" (&zero), "m" (zero));
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2005-06-26 04:55:30 +07:00
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kill_task = 1;
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2006-09-28 21:56:43 +07:00
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} else
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asm volatile("lfpc 0(%0)" : : "a" (fpt_creg_save_area));
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2005-06-26 04:55:30 +07:00
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2006-09-28 21:56:43 +07:00
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asm volatile(
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" ld 0,0(%0)\n"
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" ld 1,8(%0)\n"
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" ld 2,16(%0)\n"
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" ld 3,24(%0)\n"
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" ld 4,32(%0)\n"
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" ld 5,40(%0)\n"
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" ld 6,48(%0)\n"
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" ld 7,56(%0)\n"
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" ld 8,64(%0)\n"
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" ld 9,72(%0)\n"
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" ld 10,80(%0)\n"
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" ld 11,88(%0)\n"
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" ld 12,96(%0)\n"
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" ld 13,104(%0)\n"
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" ld 14,112(%0)\n"
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" ld 15,120(%0)\n"
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: : "a" (fpt_save_area));
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2005-06-26 04:55:30 +07:00
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}
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/* Revalidate access registers */
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2006-09-28 21:56:43 +07:00
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asm volatile(
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" lam 0,15,0(%0)"
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: : "a" (&S390_lowcore.access_regs_save_area));
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2005-06-26 04:55:30 +07:00
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if (!mci->ar)
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/*
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* Access registers have unknown contents.
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* Terminating task.
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*/
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kill_task = 1;
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/* Revalidate control registers */
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if (!mci->cr)
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/*
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* Control registers have unknown contents.
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* Can't recover and therefore stopping machine.
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*/
|
|
|
|
s390_handle_damage("invalid control registers.");
|
|
|
|
else
|
2006-01-06 15:19:28 +07:00
|
|
|
#ifdef CONFIG_64BIT
|
2006-09-28 21:56:43 +07:00
|
|
|
asm volatile(
|
|
|
|
" lctlg 0,15,0(%0)"
|
|
|
|
: : "a" (&S390_lowcore.cregs_save_area));
|
2005-06-26 04:55:30 +07:00
|
|
|
#else
|
2006-09-28 21:56:43 +07:00
|
|
|
asm volatile(
|
|
|
|
" lctl 0,15,0(%0)"
|
|
|
|
: : "a" (&S390_lowcore.cregs_save_area));
|
2005-06-26 04:55:30 +07:00
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We don't even try to revalidate the TOD register, since we simply
|
|
|
|
* can't write something sensible into that register.
|
|
|
|
*/
|
|
|
|
|
2006-01-06 15:19:28 +07:00
|
|
|
#ifdef CONFIG_64BIT
|
2005-06-26 04:55:30 +07:00
|
|
|
/*
|
|
|
|
* See if we can revalidate the TOD programmable register with its
|
|
|
|
* old contents (should be zero) otherwise set it to zero.
|
|
|
|
*/
|
|
|
|
if (!mci->pr)
|
2006-09-28 21:56:43 +07:00
|
|
|
asm volatile(
|
|
|
|
" sr 0,0\n"
|
|
|
|
" sckpf"
|
|
|
|
: : : "0", "cc");
|
2005-06-26 04:55:30 +07:00
|
|
|
else
|
|
|
|
asm volatile(
|
2006-09-28 21:56:43 +07:00
|
|
|
" l 0,0(%0)\n"
|
|
|
|
" sckpf"
|
|
|
|
: : "a" (&S390_lowcore.tod_progreg_save_area)
|
|
|
|
: "0", "cc");
|
2005-06-26 04:55:30 +07:00
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Revalidate clock comparator register */
|
2006-09-28 21:56:43 +07:00
|
|
|
asm volatile(
|
|
|
|
" stck 0(%1)\n"
|
|
|
|
" sckc 0(%1)"
|
|
|
|
: "=m" (tmpclock) : "a" (&(tmpclock)) : "cc", "memory");
|
2005-06-26 04:55:30 +07:00
|
|
|
|
|
|
|
/* Check if old PSW is valid */
|
|
|
|
if (!mci->wp)
|
|
|
|
/*
|
|
|
|
* Can't tell if we come from user or kernel mode
|
|
|
|
* -> stopping machine.
|
|
|
|
*/
|
|
|
|
s390_handle_damage("old psw invalid.");
|
|
|
|
|
|
|
|
if (!mci->ms || !mci->pm || !mci->ia)
|
|
|
|
kill_task = 1;
|
|
|
|
|
|
|
|
return kill_task;
|
|
|
|
}
|
|
|
|
|
2006-04-28 08:40:23 +07:00
|
|
|
#define MAX_IPD_COUNT 29
|
2006-05-02 02:16:14 +07:00
|
|
|
#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */
|
2006-04-28 08:40:23 +07:00
|
|
|
|
2005-06-26 04:55:30 +07:00
|
|
|
/*
|
|
|
|
* machine check handler.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
s390_do_machine_check(struct pt_regs *regs)
|
|
|
|
{
|
2006-04-28 08:40:23 +07:00
|
|
|
static DEFINE_SPINLOCK(ipd_lock);
|
|
|
|
static unsigned long long last_ipd;
|
|
|
|
static int ipd_count;
|
|
|
|
unsigned long long tmp;
|
2005-06-26 04:55:30 +07:00
|
|
|
struct mci *mci;
|
|
|
|
struct mcck_struct *mcck;
|
|
|
|
int umode;
|
|
|
|
|
2006-07-03 14:25:00 +07:00
|
|
|
lockdep_off();
|
|
|
|
|
2005-06-26 04:55:30 +07:00
|
|
|
mci = (struct mci *) &S390_lowcore.mcck_interruption_code;
|
|
|
|
mcck = &__get_cpu_var(cpu_mcck);
|
|
|
|
umode = user_mode(regs);
|
|
|
|
|
|
|
|
if (mci->sd)
|
|
|
|
/* System damage -> stopping machine */
|
|
|
|
s390_handle_damage("received system damage machine check.");
|
|
|
|
|
|
|
|
if (mci->pd) {
|
|
|
|
if (mci->b) {
|
|
|
|
/* Processing backup -> verify if we can survive this */
|
|
|
|
u64 z_mcic, o_mcic, t_mcic;
|
2006-01-06 15:19:28 +07:00
|
|
|
#ifdef CONFIG_64BIT
|
2005-06-26 04:55:30 +07:00
|
|
|
z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<29);
|
|
|
|
o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 |
|
|
|
|
1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 |
|
|
|
|
1ULL<<30 | 1ULL<<21 | 1ULL<<20 | 1ULL<<17 |
|
|
|
|
1ULL<<16);
|
|
|
|
#else
|
|
|
|
z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<57 | 1ULL<<50 |
|
|
|
|
1ULL<<29);
|
|
|
|
o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 |
|
|
|
|
1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 |
|
|
|
|
1ULL<<30 | 1ULL<<20 | 1ULL<<17 | 1ULL<<16);
|
|
|
|
#endif
|
|
|
|
t_mcic = *(u64 *)mci;
|
|
|
|
|
|
|
|
if (((t_mcic & z_mcic) != 0) ||
|
|
|
|
((t_mcic & o_mcic) != o_mcic)) {
|
|
|
|
s390_handle_damage("processing backup machine "
|
|
|
|
"check with damage.");
|
|
|
|
}
|
2006-04-28 08:40:23 +07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Nullifying exigent condition, therefore we might
|
|
|
|
* retry this instruction.
|
|
|
|
*/
|
|
|
|
|
|
|
|
spin_lock(&ipd_lock);
|
|
|
|
|
|
|
|
tmp = get_clock();
|
|
|
|
|
|
|
|
if (((tmp - last_ipd) >> 12) < MAX_IPD_TIME)
|
|
|
|
ipd_count++;
|
|
|
|
else
|
|
|
|
ipd_count = 1;
|
|
|
|
|
|
|
|
last_ipd = tmp;
|
|
|
|
|
|
|
|
if (ipd_count == MAX_IPD_COUNT)
|
|
|
|
s390_handle_damage("too many ipd retries.");
|
|
|
|
|
|
|
|
spin_unlock(&ipd_lock);
|
2005-06-26 04:55:30 +07:00
|
|
|
}
|
|
|
|
else {
|
|
|
|
/* Processing damage -> stopping machine */
|
|
|
|
s390_handle_damage("received instruction processing "
|
|
|
|
"damage machine check.");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (s390_revalidate_registers(mci)) {
|
|
|
|
if (umode) {
|
|
|
|
/*
|
|
|
|
* Couldn't restore all register contents while in
|
|
|
|
* user mode -> mark task for termination.
|
|
|
|
*/
|
|
|
|
mcck->kill_task = 1;
|
|
|
|
mcck->mcck_code = *(unsigned long long *) mci;
|
|
|
|
set_thread_flag(TIF_MCCK_PENDING);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
/*
|
|
|
|
* Couldn't restore all register contents while in
|
|
|
|
* kernel mode -> stopping machine.
|
|
|
|
*/
|
|
|
|
s390_handle_damage("unable to revalidate registers.");
|
|
|
|
}
|
|
|
|
|
|
|
|
if (mci->se)
|
|
|
|
/* Storage error uncorrected */
|
|
|
|
s390_handle_damage("received storage error uncorrected "
|
|
|
|
"machine check.");
|
|
|
|
|
|
|
|
if (mci->ke)
|
|
|
|
/* Storage key-error uncorrected */
|
|
|
|
s390_handle_damage("received storage key-error uncorrected "
|
|
|
|
"machine check.");
|
|
|
|
|
|
|
|
if (mci->ds && mci->fa)
|
|
|
|
/* Storage degradation */
|
|
|
|
s390_handle_damage("received storage degradation machine "
|
|
|
|
"check.");
|
|
|
|
|
|
|
|
if (mci->cp) {
|
|
|
|
/* Channel report word pending */
|
|
|
|
mcck->channel_report = 1;
|
|
|
|
set_thread_flag(TIF_MCCK_PENDING);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (mci->w) {
|
|
|
|
/* Warning pending */
|
|
|
|
mcck->warning = 1;
|
|
|
|
set_thread_flag(TIF_MCCK_PENDING);
|
|
|
|
}
|
2006-07-03 14:25:00 +07:00
|
|
|
lockdep_on();
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* s390_init_machine_check
|
|
|
|
*
|
|
|
|
* initialize machine check handling
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
machine_check_init(void)
|
|
|
|
{
|
|
|
|
init_MUTEX_LOCKED(&m_sem);
|
2005-06-26 04:55:30 +07:00
|
|
|
ctl_clear_bit(14, 25); /* disable external damage MCH */
|
|
|
|
ctl_set_bit(14, 27); /* enable system recovery MCH */
|
2005-04-17 05:20:36 +07:00
|
|
|
#ifdef CONFIG_MACHCHK_WARNING
|
|
|
|
ctl_set_bit(14, 24); /* enable warning MCH */
|
|
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initialize the machine check handler really early to be able to
|
|
|
|
* catch all machine checks that happen during boot
|
|
|
|
*/
|
|
|
|
arch_initcall(machine_check_init);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Machine checks for the channel subsystem must be enabled
|
|
|
|
* after the channel subsystem is initialized
|
|
|
|
*/
|
|
|
|
static int __init
|
|
|
|
machine_check_crw_init (void)
|
|
|
|
{
|
2006-06-29 20:03:17 +07:00
|
|
|
kthread_run(s390_collect_crw_info, &m_sem, "kmcheck");
|
2005-04-17 05:20:36 +07:00
|
|
|
ctl_set_bit(14, 28); /* enable channel report MCH */
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
device_initcall (machine_check_crw_init);
|