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Diffstat (limited to 'drivers/s390/s390mach.c')
-rw-r--r--drivers/s390/s390mach.c472
1 files changed, 0 insertions, 472 deletions
diff --git a/drivers/s390/s390mach.c b/drivers/s390/s390mach.c
deleted file mode 100644
index 4191fd9d4d1..00000000000
--- a/drivers/s390/s390mach.c
+++ /dev/null
@@ -1,472 +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 NORET_TYPE void
-s390_handle_damage(char *msg)
-{
-#ifdef CONFIG_SMP
- smp_send_stop();
-#endif
- disabled_wait((unsigned long) __builtin_return_address(0));
- for(;;);
-}
-
-/*
- * 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;
-}
-
-struct mcck_struct {
- int kill_task;
- int channel_report;
- int warning;
- unsigned long long mcck_code;
-};
-
-static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck);
-
-/*
- * Main machine check handler function. Will be called with interrupts enabled
- * or disabled and machine checks enabled or disabled.
- */
-void
-s390_handle_mcck(void)
-{
- unsigned long flags;
- struct mcck_struct mcck;
-
- /*
- * Disable machine checks and get the current state of accumulated
- * machine checks. Afterwards delete the old state and enable machine
- * checks again.
- */
- local_irq_save(flags);
- local_mcck_disable();
- mcck = __get_cpu_var(cpu_mcck);
- memset(&__get_cpu_var(cpu_mcck), 0, sizeof(struct mcck_struct));
- clear_thread_flag(TIF_MCCK_PENDING);
- local_mcck_enable();
- local_irq_restore(flags);
-
- if (mcck.channel_report)
- 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 (mcck.warning) { /* 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
-
- if (mcck.kill_task) {
- local_irq_enable();
- printk(KERN_EMERG "mcck: Terminating task because of machine "
- "malfunction (code 0x%016llx).\n", mcck.mcck_code);
- printk(KERN_EMERG "mcck: task: %s, pid: %d.\n",
- current->comm, current->pid);
- do_exit(SIGSEGV);
- }
-}
-
-/*
- * returns 0 if all registers could be validated
- * returns 1 otherwise
- */
-static int
-s390_revalidate_registers(struct mci *mci)
-{
- int kill_task;
- u64 tmpclock;
- u64 zero;
- void *fpt_save_area, *fpt_creg_save_area;
-
- kill_task = 0;
- zero = 0;
- /* General purpose registers */
- if (!mci->gr)
- /*
- * General purpose registers couldn't be restored and have
- * unknown contents. Process needs to be terminated.
- */
- kill_task = 1;
-
- /* Revalidate floating point registers */
- if (!mci->fp)
- /*
- * Floating point registers can't be restored and
- * therefore the process needs to be terminated.
- */
- kill_task = 1;
-
-#ifndef __s390x__
- asm volatile("ld 0,0(%0)\n"
- "ld 2,8(%0)\n"
- "ld 4,16(%0)\n"
- "ld 6,24(%0)"
- : : "a" (&S390_lowcore.floating_pt_save_area));
-#endif
-
- if (MACHINE_HAS_IEEE) {
-#ifdef __s390x__
- fpt_save_area = &S390_lowcore.floating_pt_save_area;
- fpt_creg_save_area = &S390_lowcore.fpt_creg_save_area;
-#else
- fpt_save_area = (void *) S390_lowcore.extended_save_area_addr;
- fpt_creg_save_area = fpt_save_area+128;
-#endif
- /* Floating point control register */
- if (!mci->fc) {
- /*
- * Floating point control register can't be restored.
- * Task will be terminated.
- */
- asm volatile ("lfpc 0(%0)" : : "a" (&zero), "m" (zero));
- kill_task = 1;
-
- }
- else
- asm volatile (
- "lfpc 0(%0)"
- : : "a" (fpt_creg_save_area));
-
- asm volatile("ld 0,0(%0)\n"
- "ld 1,8(%0)\n"
- "ld 2,16(%0)\n"
- "ld 3,24(%0)\n"
- "ld 4,32(%0)\n"
- "ld 5,40(%0)\n"
- "ld 6,48(%0)\n"
- "ld 7,56(%0)\n"
- "ld 8,64(%0)\n"
- "ld 9,72(%0)\n"
- "ld 10,80(%0)\n"
- "ld 11,88(%0)\n"
- "ld 12,96(%0)\n"
- "ld 13,104(%0)\n"
- "ld 14,112(%0)\n"
- "ld 15,120(%0)\n"
- : : "a" (fpt_save_area));
- }
-
- /* Revalidate access registers */
- asm volatile("lam 0,15,0(%0)"
- : : "a" (&S390_lowcore.access_regs_save_area));
- if (!mci->ar)
- /*
- * Access registers have unknown contents.
- * Terminating task.
- */
- kill_task = 1;
-
- /* Revalidate control registers */
- if (!mci->cr)
- /*
- * Control registers have unknown contents.
- * Can't recover and therefore stopping machine.
- */
- s390_handle_damage("invalid control registers.");
- else
-#ifdef __s390x__
- asm volatile("lctlg 0,15,0(%0)"
- : : "a" (&S390_lowcore.cregs_save_area));
-#else
- asm volatile("lctl 0,15,0(%0)"
- : : "a" (&S390_lowcore.cregs_save_area));
-#endif
-
- /*
- * We don't even try to revalidate the TOD register, since we simply
- * can't write something sensible into that register.
- */
-
-#ifdef __s390x__
- /*
- * See if we can revalidate the TOD programmable register with its
- * old contents (should be zero) otherwise set it to zero.
- */
- if (!mci->pr)
- asm volatile("sr 0,0\n"
- "sckpf"
- : : : "0", "cc");
- else
- asm volatile(
- "l 0,0(%0)\n"
- "sckpf"
- : : "a" (&S390_lowcore.tod_progreg_save_area) : "0", "cc");
-#endif
-
- /* Revalidate clock comparator register */
- asm volatile ("stck 0(%1)\n"
- "sckc 0(%1)"
- : "=m" (tmpclock) : "a" (&(tmpclock)) : "cc", "memory");
-
- /* 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;
-}
-
-/*
- * machine check handler.
- */
-void
-s390_do_machine_check(struct pt_regs *regs)
-{
- struct mci *mci;
- struct mcck_struct *mcck;
- int umode;
-
- 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;
-#ifdef __s390x__
- 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.");
- }
- if (!umode)
- s390_handle_damage("processing backup machine "
- "check in kernel mode.");
- mcck->kill_task = 1;
- mcck->mcck_code = *(unsigned long long *) mci;
- }
- 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);
- }
-}
-
-/*
- * 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 external damage 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);
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