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Diffstat (limited to 'ANDROID_3.4.5/arch/s390/kernel/nmi.c')
-rw-r--r--ANDROID_3.4.5/arch/s390/kernel/nmi.c375
1 files changed, 0 insertions, 375 deletions
diff --git a/ANDROID_3.4.5/arch/s390/kernel/nmi.c b/ANDROID_3.4.5/arch/s390/kernel/nmi.c
deleted file mode 100644
index 8c372ca6..00000000
--- a/ANDROID_3.4.5/arch/s390/kernel/nmi.c
+++ /dev/null
@@ -1,375 +0,0 @@
-/*
- * Machine check handler
- *
- * Copyright IBM Corp. 2000,2009
- * Author(s): Ingo Adlung <adlung@de.ibm.com>,
- * Martin Schwidefsky <schwidefsky@de.ibm.com>,
- * Cornelia Huck <cornelia.huck@de.ibm.com>,
- * Heiko Carstens <heiko.carstens@de.ibm.com>,
- */
-
-#include <linux/kernel_stat.h>
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/hardirq.h>
-#include <linux/time.h>
-#include <linux/module.h>
-#include <asm/lowcore.h>
-#include <asm/smp.h>
-#include <asm/etr.h>
-#include <asm/cputime.h>
-#include <asm/nmi.h>
-#include <asm/crw.h>
-
-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);
-
-static void s390_handle_damage(char *msg)
-{
- smp_send_stop();
- disabled_wait((unsigned long) __builtin_return_address(0));
- while (1);
-}
-
-/*
- * 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)
- crw_handle_channel_report();
- /*
- * A warning may remain for a prolonged period on the bare iron.
- * (actually until the machine is powered off, or the problem is gone)
- * So we just stop listening for the WARNING MCH and avoid 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) cpu.
- */
- if (mcck.warning) { /* WARNING pending ? */
- static int mchchk_wng_posted = 0;
-
- /* Use single cpu clear, as we cannot handle smp here. */
- __ctl_clear_bit(14, 24); /* Disable WARNING MCH */
- if (xchg(&mchchk_wng_posted, 1) == 0)
- kill_cad_pid(SIGPWR, 1);
- }
- 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 notrace s390_revalidate_registers(struct mci *mci)
-{
- int kill_task;
- u64 zero;
- void *fpt_save_area, *fpt_creg_save_area;
-
- kill_task = 0;
- zero = 0;
-
- if (!mci->gr) {
- /*
- * General purpose registers couldn't be restored and have
- * unknown contents. Process needs to be terminated.
- */
- kill_task = 1;
- }
- 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
- 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 */
- if (S390_lowcore.clock_comparator == -1)
- set_clock_comparator(S390_lowcore.mcck_clock);
- else
- set_clock_comparator(S390_lowcore.clock_comparator);
- /* 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 */
-
-#define ED_STP_ISLAND 6 /* External damage STP island check */
-#define ED_STP_SYNC 7 /* External damage STP sync check */
-#define ED_ETR_SYNC 12 /* External damage ETR sync check */
-#define ED_ETR_SWITCH 13 /* External damage ETR switch to local */
-
-/*
- * machine check handler.
- */
-void notrace s390_do_machine_check(struct pt_regs *regs)
-{
- static int ipd_count;
- static DEFINE_SPINLOCK(ipd_lock);
- static unsigned long long last_ipd;
- struct mcck_struct *mcck;
- unsigned long long tmp;
- struct mci *mci;
- int umode;
-
- nmi_enter();
- kstat_cpu(smp_processor_id()).irqs[NMI_NMI]++;
- 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);
- }
- nmi_exit();
-}
-
-static int __init machine_check_init(void)
-{
- ctl_set_bit(14, 25); /* enable external damage MCH */
- ctl_set_bit(14, 27); /* enable system recovery MCH */
- ctl_set_bit(14, 24); /* enable warning MCH */
- return 0;
-}
-arch_initcall(machine_check_init);
generated by cgit (git 2.34.1) at 2025-02-12 01:57:23 +0000