diff options
author | Dave Airlie <airlied@redhat.com> | 2009-03-28 20:22:18 -0400 |
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committer | Dave Airlie <airlied@redhat.com> | 2009-03-28 20:22:18 -0400 |
commit | 90f959bcb386da2c71613dcefc6a285e054a539e (patch) | |
tree | ee3e9dd4111d4aad12e579cb0c2c159114dff263 /drivers/s390/s390mach.c | |
parent | 41f13fe81dd1b08723ab9f3fc3c7f29cfa81f1a5 (diff) | |
parent | 07d43ba98621f08e252a48c96b258b4d572b0257 (diff) |
drm: merge Linux master into HEAD
Conflicts:
drivers/gpu/drm/drm_info.c
drivers/gpu/drm/drm_proc.c
drivers/gpu/drm/i915/i915_gem_debugfs.c
Diffstat (limited to 'drivers/s390/s390mach.c')
-rw-r--r-- | drivers/s390/s390mach.c | 538 |
1 files changed, 0 insertions, 538 deletions
diff --git a/drivers/s390/s390mach.c b/drivers/s390/s390mach.c deleted file mode 100644 index 92b0417f8e1..00000000000 --- a/drivers/s390/s390mach.c +++ /dev/null @@ -1,538 +0,0 @@ -/* - * drivers/s390/s390mach.c - * S/390 machine check handler - * - * Copyright IBM Corp. 2000,2008 - * Author(s): Ingo Adlung (adlung@de.ibm.com) - * Martin Schwidefsky (schwidefsky@de.ibm.com) - * Cornelia Huck <cornelia.huck@de.ibm.com> - */ - -#include <linux/init.h> -#include <linux/sched.h> -#include <linux/errno.h> -#include <linux/workqueue.h> -#include <linux/time.h> -#include <linux/device.h> -#include <linux/kthread.h> -#include <asm/etr.h> -#include <asm/lowcore.h> -#include <asm/cio.h> -#include <asm/cpu.h> -#include "s390mach.h" - -static struct semaphore m_sem; - -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(;;); -} - -static crw_handler_t crw_handlers[NR_RSCS]; - -/** - * s390_register_crw_handler() - register a channel report word handler - * @rsc: reporting source code to handle - * @handler: handler to be registered - * - * Returns %0 on success and a negative error value otherwise. - */ -int s390_register_crw_handler(int rsc, crw_handler_t handler) -{ - if ((rsc < 0) || (rsc >= NR_RSCS)) - return -EINVAL; - if (!cmpxchg(&crw_handlers[rsc], NULL, handler)) - return 0; - return -EBUSY; -} - -/** - * s390_unregister_crw_handler() - unregister a channel report word handler - * @rsc: reporting source code to handle - */ -void s390_unregister_crw_handler(int rsc) -{ - if ((rsc < 0) || (rsc >= NR_RSCS)) - return; - xchg(&crw_handlers[rsc], NULL); - synchronize_sched(); -} - -/* - * Retrieve CRWs and call function to handle event. - */ -static int s390_collect_crw_info(void *param) -{ - struct crw crw[2]; - int ccode; - struct semaphore *sem; - unsigned int chain; - int ignore; - - sem = (struct semaphore *)param; -repeat: - ignore = down_interruptible(sem); - chain = 0; - while (1) { - if (unlikely(chain > 1)) { - struct crw tmp_crw; - - printk(KERN_WARNING"%s: Code does not support more " - "than two chained crws; please report to " - "linux390@de.ibm.com!\n", __func__); - ccode = stcrw(&tmp_crw); - printk(KERN_WARNING"%s: crw reports slct=%d, oflw=%d, " - "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", - __func__, tmp_crw.slct, tmp_crw.oflw, - tmp_crw.chn, tmp_crw.rsc, tmp_crw.anc, - tmp_crw.erc, tmp_crw.rsid); - printk(KERN_WARNING"%s: This was crw number %x in the " - "chain\n", __func__, chain); - if (ccode != 0) - break; - chain = tmp_crw.chn ? chain + 1 : 0; - continue; - } - ccode = stcrw(&crw[chain]); - if (ccode != 0) - break; - printk(KERN_DEBUG "crw_info : CRW reports slct=%d, oflw=%d, " - "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", - crw[chain].slct, crw[chain].oflw, crw[chain].chn, - crw[chain].rsc, crw[chain].anc, crw[chain].erc, - crw[chain].rsid); - /* Check for overflows. */ - if (crw[chain].oflw) { - int i; - - pr_debug("%s: crw overflow detected!\n", __func__); - for (i = 0; i < NR_RSCS; i++) { - if (crw_handlers[i]) - crw_handlers[i](NULL, NULL, 1); - } - chain = 0; - continue; - } - if (crw[0].chn && !chain) { - chain++; - continue; - } - if (crw_handlers[crw[chain].rsc]) - crw_handlers[crw[chain].rsc](&crw[0], - chain ? &crw[1] : NULL, - 0); - /* chain is always 0 or 1 here. */ - chain = crw[chain].chn ? chain + 1 : 0; - } - 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_cad_pid(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); - } -} -EXPORT_SYMBOL_GPL(s390_handle_mcck); - -/* - * 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 CONFIG_64BIT - 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 CONFIG_64BIT - 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 CONFIG_64BIT - 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 CONFIG_64BIT - /* - * 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; -} - -#define MAX_IPD_COUNT 29 -#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */ - -/* - * machine check handler. - */ -void -s390_do_machine_check(struct pt_regs *regs) -{ - static DEFINE_SPINLOCK(ipd_lock); - static unsigned long long last_ipd; - static int ipd_count; - unsigned long long tmp; - struct mci *mci; - struct mcck_struct *mcck; - int umode; - - lockdep_off(); - - s390_idle_check(); - - 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 CONFIG_64BIT - 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."); - } - - /* - * 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); - } - 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->cd) { - /* Timing facility damage */ - s390_handle_damage("TOD clock damaged"); - } - - if (mci->ed && mci->ec) { - /* External damage */ - if (S390_lowcore.external_damage_code & (1U << ED_ETR_SYNC)) - etr_sync_check(); - if (S390_lowcore.external_damage_code & (1U << ED_ETR_SWITCH)) - etr_switch_to_local(); - if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC)) - stp_sync_check(); - if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND)) - stp_island_check(); - } - - 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); - } - lockdep_on(); -} - -/* - * s390_init_machine_check - * - * initialize machine check handling - */ -static int -machine_check_init(void) -{ - init_MUTEX_LOCKED(&m_sem); - ctl_set_bit(14, 25); /* enable 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) -{ - struct task_struct *task; - - task = kthread_run(s390_collect_crw_info, &m_sem, "kmcheck"); - if (IS_ERR(task)) - return PTR_ERR(task); - ctl_set_bit(14, 28); /* enable channel report MCH */ - return 0; -} - -device_initcall (machine_check_crw_init); |