sun4u/os/mach_cpu_states.c

	mach_cpu_states.c revision 8b464eb836173b92f2b7a65623cd06c8c3c59289
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/types.h>
#include <sys/t_lock.h>
#include <sys/uadmin.h>
#include <sys/panic.h>
#include <sys/reboot.h>
#include <sys/autoconf.h>
#include <sys/machsystm.h>
#include <sys/promif.h>
#include <sys/membar.h>
#include <vm/hat_sfmmu.h>
#include <sys/cpu_module.h>
#include <sys/cpu_sgnblk_defs.h>
#include <sys/intreg.h>
#include <sys/consdev.h>
#include <sys/kdi_impl.h>
#include <sys/callb.h>

#ifdef  TRAPTRACE
#include <sys/traptrace.h>
u_longlong_t panic_tick;
#endif /* TRAPTRACE */

extern u_longlong_t gettick();
static void reboot_machine(char *);
int disable_watchdog_on_exit = 0;

/*
 * Machine dependent code to reboot.
 * "mdep" is interpreted as a character pointer; if non-null, it is a pointer
 * to a string to be used as the argument string when rebooting.
 *
 * "invoke_cb" is a boolean. It is set to true when mdboot() can safely
 * invoke CB_CL_MDBOOT callbacks before shutting the system down, i.e. when
 * we are in a normal shutdown sequence (interrupts are not blocked, the
 * system is not panic'ing or being suspended).
 */
/*ARGSUSED*/
void
mdboot(int cmd, int fcn, char *bootstr, boolean_t invoke_cb)
{
    extern void pm_cfb_check_and_powerup(void);

    /*
     * Disable the hw watchdog timer.
     */
    if (disable_watchdog_on_exit && watchdog_activated) {
        mutex_enter(&tod_lock);
        (void) tod_ops.tod_clear_watchdog_timer();
        mutex_exit(&tod_lock);
    }

    /*
     * XXX - rconsvp is set to NULL to ensure that output messages
     * are sent to the underlying "hardware" device using the
     * monitor's printf routine since we are in the process of
     * either rebooting or halting the machine.
     */
    rconsvp = NULL;

    /*
     * At a high interrupt level we can't:
     *  1) bring up the console
     * or
     *  2) wait for pending interrupts prior to redistribution
     *     to the current CPU
     *
     * so we do them now.
     */
    pm_cfb_check_and_powerup();

    /* make sure there are no more changes to the device tree */
    devtree_freeze();

    if (invoke_cb)
        (void) callb_execute_class(CB_CL_MDBOOT, NULL);

    /*
     * Clear any unresolved UEs from memory.
     */
    page_retire_mdboot();

    /*
     * stop other cpus which also raise our priority. since there is only
     * one active cpu after this, and our priority will be too high
     * for us to be preempted, we're essentially single threaded
     * from here on out.
     */
    stop_other_cpus();

    /*
     * try and reset leaf devices.  reset_leaves() should only
     * be called when there are no other threads that could be
     * accessing devices
     */
    reset_leaves();

    if (fcn == AD_HALT) {
        halt((char *)NULL);
    } else if (fcn == AD_POWEROFF) {
        power_down(NULL);
    } else {
        if (bootstr == NULL) {
            switch (fcn) {

            case AD_BOOT:
                bootstr = "";
                break;

            case AD_IBOOT:
                bootstr = "-a";
                break;

            case AD_SBOOT:
                bootstr = "-s";
                break;

            case AD_SIBOOT:
                bootstr = "-sa";
                break;
            default:
                cmn_err(CE_WARN,
                    "mdboot: invalid function %d", fcn);
                bootstr = "";
                break;
            }
        }
        reboot_machine(bootstr);
    }
    /* MAYBE REACHED */
}

/* mdpreboot - may be called prior to mdboot while root fs still mounted */
/*ARGSUSED*/
void
mdpreboot(int cmd, int fcn, char *bootstr)
{
}

/*
 * Halt the machine and then reboot with the device
 * and arguments specified in bootstr.
 */
static void
reboot_machine(char *bootstr)
{
    flush_windows();
    stop_other_cpus();      /* send stop signal to other CPUs */
    prom_printf("rebooting...\n");
    /*
     * For platforms that use CPU signatures, we
     * need to set the signature block to OS and
     * the state to exiting for all the processors.
     */
    CPU_SIGNATURE(OS_SIG, SIGST_EXIT, SIGSUBST_REBOOT, -1);
    prom_reboot(bootstr);
    /*NOTREACHED*/
}

/*
 * We use the x-trap mechanism and idle_stop_xcall() to stop the other CPUs.
 * Once in panic_idle() they raise spl, record their location, and spin.
 */
static void
panic_idle(void)
{
    cpu_async_panic_callb(); /* check for async errors */

    (void) spl7();

    debug_flush_windows();
    (void) setjmp(&curthread->t_pcb);

    CPU->cpu_m.in_prom = 1;
    membar_stld();

    for (;;);
}

/*
 * Force the other CPUs to trap into panic_idle(), and then remove them
 * from the cpu_ready_set so they will no longer receive cross-calls.
 */
/*ARGSUSED*/
void
panic_stopcpus(cpu_t *cp, kthread_t *t, int spl)
{
    cpuset_t cps;
    int i;

    (void) splzs();
    CPUSET_ALL_BUT(cps, cp->cpu_id);
    xt_some(cps, (xcfunc_t *)idle_stop_xcall, (uint64_t)&panic_idle, NULL);

    for (i = 0; i < NCPU; i++) {
        if (i != cp->cpu_id && CPU_XCALL_READY(i)) {
            int ntries = 0x10000;

            while (!cpu[i]->cpu_m.in_prom && ntries) {
                DELAY(50);
                ntries--;
            }

            if (!cpu[i]->cpu_m.in_prom)
                printf("panic: failed to stop cpu%d\n", i);

            cpu[i]->cpu_flags &= ~CPU_READY;
            cpu[i]->cpu_flags |= CPU_QUIESCED;
            CPUSET_DEL(cpu_ready_set, cpu[i]->cpu_id);
        }
    }
}

/*
 * Platform callback following each entry to panicsys().  If we've panicked at
 * level 14, we examine t_panic_trap to see if a fatal trap occurred.  If so,
 * we disable further %tick_cmpr interrupts.  If not, an explicit call to panic
 * was made and so we re-enqueue an interrupt request structure to allow
 * further level 14 interrupts to be processed once we lower PIL.  This allows
 * us to handle panics from the deadman() CY_HIGH_LEVEL cyclic.
 */
void
panic_enter_hw(int spl)
{
    if (spl == ipltospl(PIL_14)) {
        uint_t opstate = disable_vec_intr();

        if (curthread->t_panic_trap != NULL) {
            tickcmpr_disable();
            intr_dequeue_req(PIL_14, cbe_level14_inum);
        } else {
            if (!tickcmpr_disabled())
                intr_enqueue_req(PIL_14, cbe_level14_inum);
            /*
             * Clear SOFTINT<14>, SOFTINT<0> (TICK_INT)
             * and SOFTINT<16> (STICK_INT) to indicate
             * that the current level 14 has been serviced.
             */
            wr_clr_softint((1 << PIL_14) |
                TICK_INT_MASK | STICK_INT_MASK);
        }

        enable_vec_intr(opstate);
    }
}

/*
 * Miscellaneous hardware-specific code to execute after panicstr is set
 * by the panic code: we also print and record PTL1 panic information here.
 */
/*ARGSUSED*/
void
panic_quiesce_hw(panic_data_t *pdp)
{
    extern uint_t getpstate(void);
    extern void setpstate(uint_t);

#ifdef TRAPTRACE
    /*
     * Turn off TRAPTRACE and save the current %tick value in panic_tick.
     */
    if (!panic_tick)
        panic_tick = gettick();
    TRAPTRACE_FREEZE;
#endif
    /*
     * For Platforms that use CPU signatures, we
     * need to set the signature block to OS, the state to
     * exiting, and the substate to panic for all the processors.
     */
    CPU_SIGNATURE(OS_SIG, SIGST_EXIT, SIGSUBST_PANIC, -1);

    /*
     * De-activate ECC functions and disable the watchdog timer now that
     * we've made it through the critical part of the panic code.
     */
    if (watchdog_enable)
        (void) tod_ops.tod_clear_watchdog_timer();

    /*
     * Disable further ECC errors from the CPU module and the bus nexus.
     */
    cpu_disable_errors();
    (void) bus_func_invoke(BF_TYPE_ERRDIS);

    /*
     * Redirect all interrupts to the current CPU.
     */
    intr_redist_all_cpus_shutdown();

    /*
     * This call exists solely to support dumps to network
     * devices after sync from OBP.
     *
     * If we came here via the sync callback, then on some
     * platforms, interrupts may have arrived while we were
     * stopped in OBP.  OBP will arrange for those interrupts to
     * be redelivered if you say "go", but not if you invoke a
     * client callback like 'sync'.  For some dump devices
     * (network swap devices), we need interrupts to be
     * delivered in order to dump, so we have to call the bus
     * nexus driver to reset the interrupt state machines.
     */
    (void) bus_func_invoke(BF_TYPE_RESINTR);

    setpstate(getpstate() | PSTATE_IE);
}

/*
 * Platforms that use CPU signatures need to set the signature block to OS and
 * the state to exiting for all CPUs. PANIC_CONT indicates that we're about to
 * write the crash dump, which tells the SSP/SMS to begin a timeout routine to
 * reboot the machine if the dump never completes.
 */
/*ARGSUSED*/
void
panic_dump_hw(int spl)
{
    CPU_SIGNATURE(OS_SIG, SIGST_EXIT, SIGSUBST_DUMP, -1);
}

/*
 * for ptl1_panic
 */
void
ptl1_init_cpu(struct cpu *cpu)
{
    ptl1_state_t *pstate = &cpu->cpu_m.ptl1_state;

    /*CONSTCOND*/
    if (sizeof (struct cpu) + PTL1_SSIZE > CPU_ALLOC_SIZE) {
        panic("ptl1_init_cpu: not enough space left for ptl1_panic "
            "stack, sizeof (struct cpu) = %lu", sizeof (struct cpu));
    }

    pstate->ptl1_stktop = (uintptr_t)cpu + CPU_ALLOC_SIZE;
    cpu_pa[cpu->cpu_id] = va_to_pa(cpu);
}

void
ptl1_panic_handler(ptl1_state_t *pstate)
{
    static const char *ptl1_reasons[] = {
#ifdef  PTL1_PANIC_DEBUG
        "trap for debug purpose",   /* PTL1_BAD_DEBUG */
#else
        "unknown trap",         /* PTL1_BAD_DEBUG */
#endif
        "register window trap",     /* PTL1_BAD_WTRAP */
        "kernel MMU miss",      /* PTL1_BAD_KMISS */
        "kernel protection fault",  /* PTL1_BAD_KPROT_FAULT */
        "ISM MMU miss",         /* PTL1_BAD_ISM */
        "kernel MMU trap",      /* PTL1_BAD_MMUTRAP */
        "kernel trap handler state",    /* PTL1_BAD_TRAP */
        "floating point trap",      /* PTL1_BAD_FPTRAP */
#ifdef  DEBUG
        "pointer to intr_vec",      /* PTL1_BAD_INTR_VEC */
#else
        "unknown trap",         /* PTL1_BAD_INTR_VEC */
#endif
#ifdef  TRAPTRACE
        "TRACE_PTR state",      /* PTL1_BAD_TRACE_PTR */
#else
        "unknown trap",         /* PTL1_BAD_TRACE_PTR */
#endif
        "stack overflow",       /* PTL1_BAD_STACK */
        "DTrace flags",         /* PTL1_BAD_DTRACE_FLAGS */
        "attempt to steal locked ctx",  /* PTL1_BAD_CTX_STEAL */
        "CPU ECC error loop",       /* PTL1_BAD_ECC */
        "non-kernel context in sys/priv_trap() below or",
                        /* PTL1_BAD_CTX */
    };

    uint_t reason = pstate->ptl1_regs.ptl1_g1;
    uint_t tl = pstate->ptl1_regs.ptl1_trap_regs[0].ptl1_tl;
    struct trap_info ti = { 0 };

    /*
     * Use trap_info for a place holder to call panic_savetrap() and
     * panic_showtrap() to save and print out ptl1_panic information.
     */
    if (curthread->t_panic_trap == NULL)
        curthread->t_panic_trap = &ti;

    if (reason < sizeof (ptl1_reasons) / sizeof (ptl1_reasons[0]))
        panic("bad %s at TL %u", ptl1_reasons[reason], tl);
    else
        panic("ptl1_panic reason 0x%x at TL %u", reason, tl);
}

void
clear_watchdog_on_exit()
{
    /*
     * Only shut down an active hardware watchdog timer if the platform
     * has expressed an interest to.
     */
    if (disable_watchdog_on_exit && watchdog_activated) {
        prom_printf("Debugging requested; hardware watchdog "
            "disabled; reboot to re-enable.\n");
        cmn_err(CE_WARN, "!Debugging requested; hardware watchdog "
            "disabled; reboot to re-enable.");
        mutex_enter(&tod_lock);
        (void) tod_ops.tod_clear_watchdog_timer();
        mutex_exit(&tod_lock);
    }
}

/*
 * This null routine is only used by sun4v watchdog timer support.
 */
void
restore_watchdog_on_entry(void)
{
}

int
kdi_watchdog_disable(void)
{
    if (watchdog_activated) {
        mutex_enter(&tod_lock);
        (void) tod_ops.tod_clear_watchdog_timer();
        mutex_exit(&tod_lock);
    }

    return (watchdog_activated);
}

void
kdi_watchdog_restore(void)
{
    if (watchdog_enable) {
        mutex_enter(&tod_lock);
        (void) tod_ops.tod_set_watchdog_timer(watchdog_timeout_seconds);
        mutex_exit(&tod_lock);
    }
}

/*
 * This null routine is only used by sun4v watchdog timer support.
 */
void
watchdog_init(void)
{
}

/*
 * This null routine is only used by sun4v watchdog timer support.
 */
void
watchdog_pat(void)
{
}

/*
 * This null routine is only used by sun4v watchdog timer support.
 */
void
watchdog_suspend(void)
{
}

/*
 * This null routine is only used by sun4v watchdog timer support.
 */
void
watchdog_resume(void)
{
}

/*
 * This null routine is only used by sun4v watchdog timer support.
 */
void
watchdog_clear(void)
{
}

/*ARGSUSED*/
void
mach_dump_buffer_init(void)
{
    /*
     * setup dump buffer to store extra crash information
     * not applicable to sun4u
     */
}

/*
 * xt_sync - wait for previous x-traps to finish
 */
void
xt_sync(cpuset_t cpuset)
{
    kpreempt_disable();
    CPUSET_DEL(cpuset, CPU->cpu_id);
    CPUSET_AND(cpuset, cpu_ready_set);
    xt_some(cpuset, (xcfunc_t *)xt_sync_tl1, 0, 0);
    kpreempt_enable();
}