void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
{
struct _lowcore *lc, *current_lc;
struct stack_frame *sf;
struct pt_regs *regs;
unsigned long sp;
if (smp_processor_id() == 0)
func(data);
__load_psw_mask(PSW_BASE_BITS | PSW_DEFAULT_KEY);
/* Disable lowcore protection */
__ctl_clear_bit(0, 28);
current_lc = lowcore_ptr[smp_processor_id()];
lc = lowcore_ptr[0];
if (!lc)
lc = current_lc;
lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu;
if (!cpu_online(0))
smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]);
while (sigp(0, sigp_stop_and_store_status) == sigp_busy)
cpu_relax();
sp = lc->panic_stack;
sp -= sizeof(struct pt_regs);
regs = (struct pt_regs *) sp;
memcpy(®s->gprs, ¤t_lc->gpregs_save_area, sizeof(regs->gprs));
regs->psw = lc->psw_save_area;
sp -= STACK_FRAME_OVERHEAD;
sf = (struct stack_frame *) sp;
sf->back_chain = regs->gprs[15];
smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]);
}
/*
* Activate a secondary processor.
*/
int __cpuinit start_secondary(void *cpuvoid)
{
/* Setup the cpu */
cpu_init();
preempt_disable();
/* Enable TOD clock interrupts on the secondary cpu. */
init_cpu_timer();
/* Enable cpu timer interrupts on the secondary cpu. */
init_cpu_vtimer();
/* Enable pfault pseudo page faults on this cpu. */
pfault_init();
/* call cpu notifiers */
notify_cpu_starting(smp_processor_id());
/* Mark this cpu as online */
ipi_call_lock();
set_cpu_online(smp_processor_id(), true);
ipi_call_unlock();
__ctl_clear_bit(0, 28); /* Disable lowcore protection */
S390_lowcore.restart_psw.mask =
PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
S390_lowcore.restart_psw.addr =
PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
__ctl_set_bit(0, 28); /* Enable lowcore protection */
local_irq_enable();
/* cpu_idle will call schedule for us */
cpu_idle();
return 0;
}
/*
* Activate a secondary processor.
*/
int __cpuinit start_secondary(void *cpuvoid)
{
cpu_init();
preempt_disable();
init_cpu_timer();
init_cpu_vtimer();
pfault_init();
notify_cpu_starting(smp_processor_id());
ipi_call_lock();
set_cpu_online(smp_processor_id(), true);
ipi_call_unlock();
__ctl_clear_bit(0, 28); /* Disable lowcore protection */
S390_lowcore.restart_psw.mask =
PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
S390_lowcore.restart_psw.addr =
PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
__ctl_set_bit(0, 28); /* Enable lowcore protection */
/*
* Wait until the cpu which brought this one up marked it
* active before enabling interrupts.
*/
while (!cpumask_test_cpu(smp_processor_id(), cpu_active_mask))
cpu_relax();
local_irq_enable();
/* cpu_idle will call schedule for us */
cpu_idle();
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
}
void detect_memory_layout(struct mem_chunk chunk[])
{
unsigned long flags, cr0;
memset(chunk, 0, MEMORY_CHUNKS * sizeof(struct mem_chunk));
/* Disable IRQs, DAT and low address protection so tprot does the
* right thing and we don't get scheduled away with low address
* protection disabled.
*/
flags = __arch_local_irq_stnsm(0xf8);
__ctl_store(cr0, 0, 0);
__ctl_clear_bit(0, 28);
find_memory_chunks(chunk);
__ctl_load(cr0, 0, 0);
arch_local_irq_restore(flags);
}
static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
{
int rc;
__ctl_set_bit(0, 9);
rc = sclp_service_call(cmd, sccb);
if (rc)
goto out;
__load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT |
PSW_MASK_WAIT | PSW_DEFAULT_KEY);
local_irq_disable();
out:
/* Contents of the sccb might have changed. */
barrier();
__ctl_clear_bit(0, 9);
return rc;
}
static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
{
int rc;
__ctl_set_bit(0, 9);
rc = sclp_service_call(cmd, sccb);
if (rc)
goto out;
__load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
local_irq_disable();
out:
barrier();
__ctl_clear_bit(0, 9);
return rc;
}
void save_processor_state(void)
{
/* swsusp_arch_suspend() actually saves all cpu register contents.
* Machine checks must be disabled since swsusp_arch_suspend() stores
* register contents to their lowcore save areas. That's the same
* place where register contents on machine checks would be saved.
* To avoid register corruption disable machine checks.
* We must also disable machine checks in the new psw mask for
* program checks, since swsusp_arch_suspend() may generate program
* checks. Disabling machine checks for all other new psw masks is
* just paranoia.
*/
local_mcck_disable();
/* Disable lowcore protection */
__ctl_clear_bit(0,28);
S390_lowcore.external_new_psw.mask &= ~PSW_MASK_MCHECK;
S390_lowcore.svc_new_psw.mask &= ~PSW_MASK_MCHECK;
S390_lowcore.io_new_psw.mask &= ~PSW_MASK_MCHECK;
S390_lowcore.program_new_psw.mask &= ~PSW_MASK_MCHECK;
}
static void css_reset(void)
{
int i, ret;
unsigned long long timeout;
struct chp_id chpid;
/* Reset subchannels. */
for_each_subchannel(__shutdown_subchannel_easy, NULL);
/* Reset channel paths. */
s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
/* Enable channel report machine checks. */
__ctl_set_bit(14, 28);
/* Temporarily reenable machine checks. */
local_mcck_enable();
chp_id_init(&chpid);
for (i = 0; i <= __MAX_CHPID; i++) {
chpid.id = i;
ret = rchp(chpid);
if ((ret == 0) || (ret == 2))
/*
* rchp either succeeded, or another rchp is already
* in progress. In either case, we'll get a crw.
*/
atomic_inc(&chpid_reset_count);
}
/* Wait for machine check for all channel paths. */
timeout = get_tod_clock_fast() + (RCHP_TIMEOUT << 12);
while (atomic_read(&chpid_reset_count) != 0) {
if (get_tod_clock_fast() > timeout)
break;
cpu_relax();
}
/* Disable machine checks again. */
local_mcck_disable();
/* Disable channel report machine checks. */
__ctl_clear_bit(14, 28);
s390_base_mcck_handler_fn = NULL;
}
/*
* s390_do_machine_check
*
* mchine check pre-processor, collecting the machine check info,
* queueing it and posting the machine check handler for processing.
*/
void s390_do_machine_check( void )
{
int crw_count;
mcic_t mcic;
trapid_t ltt_interruption_code;
uint32_t ltt_old_psw;
#ifdef S390_MACHCHK_DEBUG
printk( KERN_INFO "s390_do_machine_check : starting ...\n");
#endif
memcpy( &mcic,
&S390_lowcore.mcck_interruption_code,
sizeof(__u64));
memcpy( <t_interruption_code,
&S390_lowcore.mcck_interruption_code,
sizeof(__u64));
memcpy( <t_old_psw,
&S390_lowcore.mcck_old_psw,
sizeof(uint32_t));
ltt_old_psw &= PSW_ADDR_MASK;
TRACE_TRAP_ENTRY(ltt_interruption_code,ltt_old_psw);
if (mcic.mcc.mcd.sd) /* system damage */
s390_handle_damage("received system damage machine check\n");
if (mcic.mcc.mcd.pd) /* instruction processing damage */
s390_handle_damage("received instruction processing damage machine check\n");
if (mcic.mcc.mcd.se) /* storage error uncorrected */
s390_handle_damage("received storage error uncorrected machine check\n");
if (mcic.mcc.mcd.sc) /* storage error corrected */
printk(KERN_WARNING "received storage error corrected machine check\n");
if (mcic.mcc.mcd.ke) /* storage key-error uncorrected */
s390_handle_damage("received storage key-error uncorrected machine check\n");
if (mcic.mcc.mcd.ds && mcic.mcc.mcd.fa) /* storage degradation */
s390_handle_damage("received storage degradation machine check\n");
if ( mcic.mcc.mcd.cp ) // CRW pending ?
{
crw_count = s390_collect_crw_info();
if ( crw_count )
{
up( &s_sem );
} /* endif */
} /* endif */
#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 ( mcic.mcc.mcd.w ) // WARNING pending ?
{
// Use single machine clear, as we cannot handle smp right now
__ctl_clear_bit( 14, 24 ); // Disable WARNING MCH
if ( ! mchchk_wng_posted )
{
mchchk_wng_posted = s390_post_warning();
if ( mchchk_wng_posted )
{
up( &s_sem );
} /* endif */
} /* endif */
} /* endif */
#endif
#ifdef S390_MACHCHK_DEBUG
printk( KERN_INFO "s390_do_machine_check : done \n");
#endif
return;
}
