![Linus Torvalds](/assets/img/avatar_default.png)
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!
220 lines
5.4 KiB
C
220 lines
5.4 KiB
C
/*
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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/config.h>
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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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#include <asm/lowcore.h>
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#include "s390mach.h"
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#define DBG printk
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// #define DBG(args,...) do {} while (0);
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static struct semaphore m_sem;
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extern int css_process_crw(int);
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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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static void
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s390_handle_damage(char *msg)
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{
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printk(KERN_EMERG "%s\n", msg);
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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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}
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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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struct crw crw;
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int ccode, ret, slow;
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struct semaphore *sem;
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sem = (struct semaphore *)param;
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/* Set a nice name. */
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daemonize("kmcheck");
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repeat:
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down_interruptible(sem);
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slow = 0;
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while (1) {
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ccode = stcrw(&crw);
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if (ccode != 0)
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break;
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DBG(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.slct, crw.oflw, crw.chn, crw.rsc, crw.anc,
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crw.erc, crw.rsid);
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/* Check for overflows. */
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if (crw.oflw) {
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pr_debug("%s: crw overflow detected!\n", __FUNCTION__);
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css_reiterate_subchannels();
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slow = 1;
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continue;
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}
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switch (crw.rsc) {
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case CRW_RSC_SCH:
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pr_debug("source is subchannel %04X\n", crw.rsid);
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ret = css_process_crw (crw.rsid);
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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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pr_debug("source is channel path %02X\n", crw.rsid);
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switch (crw.erc) {
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case CRW_ERC_IPARM: /* Path has come. */
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ret = chp_process_crw(crw.rsid, 1);
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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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ret = chp_process_crw(crw.rsid, 0);
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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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crw.erc);
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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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}
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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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/*
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* machine check handler.
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*/
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void
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s390_do_machine_check(void)
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{
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struct mci *mci;
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mci = (struct mci *) &S390_lowcore.mcck_interruption_code;
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if (mci->sd) /* system damage */
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s390_handle_damage("received system damage machine check\n");
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if (mci->pd) /* instruction processing damage */
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s390_handle_damage("received instruction processing "
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"damage machine check\n");
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if (mci->se) /* storage error uncorrected */
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s390_handle_damage("received storage error uncorrected "
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"machine check\n");
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if (mci->sc) /* storage error corrected */
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printk(KERN_WARNING
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"received storage error corrected machine check\n");
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if (mci->ke) /* storage key-error uncorrected */
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s390_handle_damage("received storage key-error uncorrected "
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"machine check\n");
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if (mci->ds && mci->fa) /* storage degradation */
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s390_handle_damage("received storage degradation machine "
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"check\n");
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if (mci->cp) /* channel report word pending */
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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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if (mci->w) { /* WARNING pending ? */
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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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kill_proc(1, SIGPWR, 1);
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}
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#endif
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}
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/*
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* s390_init_machine_check
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*
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* initialize machine check handling
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*/
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static int
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machine_check_init(void)
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{
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init_MUTEX_LOCKED(&m_sem);
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ctl_clear_bit(14, 25); /* disable damage MCH */
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ctl_set_bit(14, 26); /* enable degradation MCH */
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ctl_set_bit(14, 27); /* enable system recovery MCH */
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#ifdef CONFIG_MACHCHK_WARNING
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ctl_set_bit(14, 24); /* enable warning MCH */
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#endif
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return 0;
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}
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/*
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* Initialize the machine check handler really early to be able to
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* catch all machine checks that happen during boot
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*/
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arch_initcall(machine_check_init);
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/*
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* Machine checks for the channel subsystem must be enabled
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* after the channel subsystem is initialized
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*/
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static int __init
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machine_check_crw_init (void)
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{
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kernel_thread(s390_collect_crw_info, &m_sem, CLONE_FS|CLONE_FILES);
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ctl_set_bit(14, 28); /* enable channel report MCH */
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return 0;
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}
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device_initcall (machine_check_crw_init);
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