diff options
Diffstat (limited to 'drivers/s390/s390mach.c')
| -rw-r--r-- | drivers/s390/s390mach.c | 219 |
1 files changed, 0 insertions, 219 deletions
diff --git a/drivers/s390/s390mach.c b/drivers/s390/s390mach.c deleted file mode 100644 index ffa996c8a90..00000000000 --- a/drivers/s390/s390mach.c +++ /dev/null @@ -1,219 +0,0 @@ -/* - * drivers/s390/s390mach.c - * S/390 machine check handler - * - * S390 version - * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation - * Author(s): Ingo Adlung (adlung@de.ibm.com) - * Martin Schwidefsky (schwidefsky@de.ibm.com) - */ - -#include <linux/config.h> -#include <linux/init.h> -#include <linux/sched.h> -#include <linux/errno.h> -#include <linux/workqueue.h> - -#include <asm/lowcore.h> - -#include "s390mach.h" - -#define DBG printk -// #define DBG(args,...) do {} while (0); - -static struct semaphore m_sem; - -extern int css_process_crw(int); -extern int chsc_process_crw(void); -extern int chp_process_crw(int, int); -extern void css_reiterate_subchannels(void); - -extern struct workqueue_struct *slow_path_wq; -extern struct work_struct slow_path_work; - -static void -s390_handle_damage(char *msg) -{ - printk(KERN_EMERG "%s\n", msg); -#ifdef CONFIG_SMP - smp_send_stop(); -#endif - disabled_wait((unsigned long) __builtin_return_address(0)); -} - -/* - * Retrieve CRWs and call function to handle event. - * - * Note : we currently process CRWs for io and chsc subchannels only - */ -static int -s390_collect_crw_info(void *param) -{ - struct crw crw; - int ccode, ret, slow; - struct semaphore *sem; - - sem = (struct semaphore *)param; - /* Set a nice name. */ - daemonize("kmcheck"); -repeat: - down_interruptible(sem); - slow = 0; - while (1) { - ccode = stcrw(&crw); - if (ccode != 0) - break; - DBG(KERN_DEBUG "crw_info : CRW reports slct=%d, oflw=%d, " - "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", - crw.slct, crw.oflw, crw.chn, crw.rsc, crw.anc, - crw.erc, crw.rsid); - /* Check for overflows. */ - if (crw.oflw) { - pr_debug("%s: crw overflow detected!\n", __FUNCTION__); - css_reiterate_subchannels(); - slow = 1; - continue; - } - switch (crw.rsc) { - case CRW_RSC_SCH: - pr_debug("source is subchannel %04X\n", crw.rsid); - ret = css_process_crw (crw.rsid); - if (ret == -EAGAIN) - slow = 1; - break; - case CRW_RSC_MONITOR: - pr_debug("source is monitoring facility\n"); - break; - case CRW_RSC_CPATH: - pr_debug("source is channel path %02X\n", crw.rsid); - switch (crw.erc) { - case CRW_ERC_IPARM: /* Path has come. */ - ret = chp_process_crw(crw.rsid, 1); - break; - case CRW_ERC_PERRI: /* Path has gone. */ - case CRW_ERC_PERRN: - ret = chp_process_crw(crw.rsid, 0); - break; - default: - pr_debug("Don't know how to handle erc=%x\n", - crw.erc); - ret = 0; - } - if (ret == -EAGAIN) - slow = 1; - break; - case CRW_RSC_CONFIG: - pr_debug("source is configuration-alert facility\n"); - break; - case CRW_RSC_CSS: - pr_debug("source is channel subsystem\n"); - ret = chsc_process_crw(); - if (ret == -EAGAIN) - slow = 1; - break; - default: - pr_debug("unknown source\n"); - break; - } - } - if (slow) - queue_work(slow_path_wq, &slow_path_work); - goto repeat; - return 0; -} - -/* - * machine check handler. - */ -void -s390_do_machine_check(void) -{ - struct mci *mci; - - mci = (struct mci *) &S390_lowcore.mcck_interruption_code; - - if (mci->sd) /* system damage */ - s390_handle_damage("received system damage machine check\n"); - - if (mci->pd) /* instruction processing damage */ - s390_handle_damage("received instruction processing " - "damage machine check\n"); - - if (mci->se) /* storage error uncorrected */ - s390_handle_damage("received storage error uncorrected " - "machine check\n"); - - if (mci->sc) /* storage error corrected */ - printk(KERN_WARNING - "received storage error corrected machine check\n"); - - if (mci->ke) /* storage key-error uncorrected */ - s390_handle_damage("received storage key-error uncorrected " - "machine check\n"); - - if (mci->ds && mci->fa) /* storage degradation */ - s390_handle_damage("received storage degradation machine " - "check\n"); - - if (mci->cp) /* channel report word pending */ - up(&m_sem); - -#ifdef CONFIG_MACHCHK_WARNING -/* - * The warning may remain for a prolonged period on the bare iron. - * (actually till the machine is powered off, or until the problem is gone) - * So we just stop listening for the WARNING MCH and prevent continuously - * being interrupted. One caveat is however, that we must do this per - * processor and cannot use the smp version of ctl_clear_bit(). - * On VM we only get one interrupt per virtally presented machinecheck. - * Though one suffices, we may get one interrupt per (virtual) processor. - */ - if (mci->w) { /* WARNING pending ? */ - static int mchchk_wng_posted = 0; - /* - * Use single machine clear, as we cannot handle smp right now - */ - __ctl_clear_bit(14, 24); /* Disable WARNING MCH */ - if (xchg(&mchchk_wng_posted, 1) == 0) - kill_proc(1, SIGPWR, 1); - } -#endif -} - -/* - * s390_init_machine_check - * - * initialize machine check handling - */ -static int -machine_check_init(void) -{ - init_MUTEX_LOCKED(&m_sem); - ctl_clear_bit(14, 25); /* disable damage MCH */ - ctl_set_bit(14, 26); /* enable degradation MCH */ - ctl_set_bit(14, 27); /* enable system recovery MCH */ -#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) -{ - kernel_thread(s390_collect_crw_info, &m_sem, CLONE_FS|CLONE_FILES); - ctl_set_bit(14, 28); /* enable channel report MCH */ - return 0; -} - -device_initcall (machine_check_crw_init); |