mca.c

linux-2.4.29操作系统的源码

	 * same serial line, the user will need some time to switch out of the BMC before
	 * the dump begins.
	 */
	printk("Delaying for 5 seconds...\n");
	udelay(5*1000000);
	show_min_state(ms);

	printk("Backtrace of current task (pid %d, %s)\n", current->pid, current->comm);
	fetch_min_state(ms, pt, sw);
	unw_init_from_interruption(&info, current, pt, sw);
	ia64_do_show_stack(&info, NULL);

#ifdef CONFIG_SMP
	/* read_trylock() would be handy... */
	if (!tasklist_lock.write_lock)
		read_lock(&tasklist_lock);
#endif
	{
		struct task_struct *t;
		for_each_task(t) {
			if (t == current)
				continue;

			printk("\nBacktrace of pid %d (%s)\n", t->pid, t->comm);
			show_stack(t);
		}
	}
#ifdef CONFIG_SMP
	if (!tasklist_lock.write_lock)
		read_unlock(&tasklist_lock);
#endif

	printk("\nINIT dump complete.  Please reboot now.\n");
	while (1);			/* hang city if no debugger */
}

#ifdef CONFIG_ACPI
/*
 * ia64_mca_register_cpev
 *
 *  Register the corrected platform error vector with SAL.
 *
 *  Inputs
 *      cpev        Corrected Platform Error Vector number
 *
 *  Outputs
 *      None
 */
static void
ia64_mca_register_cpev (int cpev)
{
	/* Register the CPE interrupt vector with SAL */
	struct ia64_sal_retval isrv;

	isrv = ia64_sal_mc_set_params(SAL_MC_PARAM_CPE_INT, SAL_MC_PARAM_MECHANISM_INT, cpev, 0, 0);
	if (isrv.status) {
		printk(KERN_ERR "Failed to register Corrected Platform "
		       "Error interrupt vector with SAL (status %ld)\n", isrv.status);
		return;
	}

	IA64_MCA_DEBUG("%s: corrected platform error "
		       "vector %#x setup and enabled\n", __FUNCTION__, cpev);
}
#endif /* CONFIG_ACPI */

#endif /* PLATFORM_MCA_HANDLERS */

/*
 * ia64_mca_cmc_vector_setup
 *
 *  Setup the corrected machine check vector register in the processor and
 *  unmask interrupt.  This function is invoked on a per-processor basis.
 *
 * Inputs
 *      None
 *
 * Outputs
 *	None
 */
void
ia64_mca_cmc_vector_setup (void)
{
	cmcv_reg_t	cmcv;

	cmcv.cmcv_regval	= 0;
	cmcv.cmcv_mask		= 0;        /* Unmask/enable interrupt */
	cmcv.cmcv_vector	= IA64_CMC_VECTOR;
	ia64_set_cmcv(cmcv.cmcv_regval);

	IA64_MCA_DEBUG("%s: CPU %d corrected "
		       "machine check vector %#x setup and enabled.\n",
		       __FUNCTION__, smp_processor_id(), IA64_CMC_VECTOR);

	IA64_MCA_DEBUG("%s: CPU %d CMCV = %#016lx\n",
		       __FUNCTION__, smp_processor_id(), ia64_get_cmcv());
}

/*
 * ia64_mca_cmc_vector_disable
 *
 *  Mask the corrected machine check vector register in the processor.
 *  This function is invoked on a per-processor basis.
 *
 * Inputs
 *      dummy(unused)
 *
 * Outputs
 *	None
 */
static void
ia64_mca_cmc_vector_disable (void *dummy)
{
	cmcv_reg_t	cmcv;
	
	cmcv = (cmcv_reg_t)ia64_get_cmcv();

	cmcv.cmcv_mask = 1; /* Mask/disable interrupt */
	ia64_set_cmcv(cmcv.cmcv_regval);

	IA64_MCA_DEBUG("%s: CPU %d corrected "
		       "machine check vector %#x disabled.\n",
		       __FUNCTION__, smp_processor_id(), cmcv.cmcv_vector);
}

/*
 * ia64_mca_cmc_vector_enable
 *
 *  Unmask the corrected machine check vector register in the processor.
 *  This function is invoked on a per-processor basis.
 *
 * Inputs
 *      dummy(unused)
 *
 * Outputs
 *	None
 */
static void
ia64_mca_cmc_vector_enable (void *dummy)
{
	cmcv_reg_t	cmcv;
	
	cmcv = (cmcv_reg_t)ia64_get_cmcv();

	cmcv.cmcv_mask = 0; /* Unmask/enable interrupt */
	ia64_set_cmcv(cmcv.cmcv_regval);

	IA64_MCA_DEBUG("%s: CPU %d corrected "
		       "machine check vector %#x enabled.\n",
		       __FUNCTION__, smp_processor_id(), cmcv.cmcv_vector);
}

/*
 * ia64_mca_cmc_vector_disable_keventd
 *
 * Called via keventd (smp_call_function() is not safe in interrupt context) to
 * disable the cmc interrupt vector.
 *
 * Note: needs preempt_disable() if you apply the preempt patch to 2.4.
 */
static void
ia64_mca_cmc_vector_disable_keventd(void *unused)
{
	ia64_mca_cmc_vector_disable(NULL);
	smp_call_function(ia64_mca_cmc_vector_disable, NULL, 1, 0);
}

/*
 * ia64_mca_cmc_vector_enable_keventd
 *
 * Called via keventd (smp_call_function() is not safe in interrupt context) to
 * enable the cmc interrupt vector.
 *
 * Note: needs preempt_disable() if you apply the preempt patch to 2.4.
 */
static void
ia64_mca_cmc_vector_enable_keventd(void *unused)
{
	smp_call_function(ia64_mca_cmc_vector_enable, NULL, 1, 0);
	ia64_mca_cmc_vector_enable(NULL);
}

/*
 * ia64_mca_wakeup_ipi_wait
 *
 *	Wait for the inter-cpu interrupt to be sent by the
 *	monarch processor once it is done with handling the
 *	MCA.
 *
 *  Inputs  :   None
 *  Outputs :   None
 */
static void
ia64_mca_wakeup_ipi_wait(void)
{
	int	irr_num = (IA64_MCA_WAKEUP_VECTOR >> 6);
	int	irr_bit = (IA64_MCA_WAKEUP_VECTOR & 0x3f);
	u64	irr = 0;

	do {
		switch(irr_num) {
		      case 0:
			irr = ia64_get_irr0();
			break;
		      case 1:
			irr = ia64_get_irr1();
			break;
		      case 2:
			irr = ia64_get_irr2();
			break;
		      case 3:
			irr = ia64_get_irr3();
			break;
		}
	} while (!(irr & (1UL << irr_bit))) ;
}

/*
 * ia64_mca_wakeup
 *
 *	Send an inter-cpu interrupt to wake-up a particular cpu
 *	and mark that cpu to be out of rendez.
 *
 *  Inputs  :   cpuid
 *  Outputs :   None
 */
static void
ia64_mca_wakeup(int cpu)
{
	platform_send_ipi(cpu, IA64_MCA_WAKEUP_VECTOR, IA64_IPI_DM_INT, 0);
	ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;

}

/*
 * ia64_mca_wakeup_all
 *
 *	Wakeup all the cpus which have rendez'ed previously.
 *
 *  Inputs  :   None
 *  Outputs :   None
 */
static void
ia64_mca_wakeup_all(void)
{
	int cpu;

	/* Clear the Rendez checkin flag for all cpus */
	for(cpu = 0; cpu < NR_CPUS; cpu++) {
		if (!cpu_online(cpu))
			continue;
		if (ia64_mc_info.imi_rendez_checkin[cpu] == IA64_MCA_RENDEZ_CHECKIN_DONE)
			ia64_mca_wakeup(cpu);
	}

}

/*
 * ia64_mca_rendez_interrupt_handler
 *
 *	This is handler used to put slave processors into spinloop
 *	while the monarch processor does the mca handling and later
 *	wake each slave up once the monarch is done.
 *
 *  Inputs  :   None
 *  Outputs :   None
 */
static void
ia64_mca_rendez_int_handler(int rendez_irq, void *arg, struct pt_regs *ptregs)
{
	unsigned long flags;
	int cpu = smp_processor_id();

	/* Mask all interrupts */
	local_irq_save(flags);

	ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_DONE;
	/* Register with the SAL monarch that the slave has
	 * reached SAL
	 */
	ia64_sal_mc_rendez();

	/* Wait for the wakeup IPI from the monarch
	 * This waiting is done by polling on the wakeup-interrupt
	 * vector bit in the processor's IRRs
	 */
	ia64_mca_wakeup_ipi_wait();

	/* Enable all interrupts */
	local_irq_restore(flags);
}

/*
 * ia64_mca_wakeup_int_handler
 *
 *	The interrupt handler for processing the inter-cpu interrupt to the
 *	slave cpu which was spinning in the rendez loop.
 *	Since this spinning is done by turning off the interrupts and
 *	polling on the wakeup-interrupt bit in the IRR, there is
 *	nothing useful to be done in the handler.
 *
 *  Inputs  :   wakeup_irq  (Wakeup-interrupt bit)
 *	arg		(Interrupt handler specific argument)
 *	ptregs		(Exception frame at the time of the interrupt)
 *  Outputs :   None
 *
 */
static void
ia64_mca_wakeup_int_handler(int wakeup_irq, void *arg, struct pt_regs *ptregs)
{
}

/*
 * ia64_return_to_sal_check
 *
 *	This is function called before going back from the OS_MCA handler
 *	to the OS_MCA dispatch code which finally takes the control back
 *	to the SAL.
 *	The main purpose of this routine is to setup the OS_MCA to SAL
 *	return state which can be used by the OS_MCA dispatch code
 *	just before going back to SAL.
 *
 *  Inputs  :   None
 *  Outputs :   None
 */

static void
ia64_return_to_sal_check(int recover)
{

	/* Copy over some relevant stuff from the sal_to_os_mca_handoff
	 * so that it can be used at the time of os_mca_to_sal_handoff
	 */
	ia64_os_to_sal_handoff_state.imots_sal_gp =
		ia64_sal_to_os_handoff_state.imsto_sal_gp;

	ia64_os_to_sal_handoff_state.imots_sal_check_ra =
		ia64_sal_to_os_handoff_state.imsto_sal_check_ra;

	if (recover)
		ia64_os_to_sal_handoff_state.imots_os_status = IA64_MCA_CORRECTED;
	else
		ia64_os_to_sal_handoff_state.imots_os_status = IA64_MCA_COLD_BOOT;

	/* Default = tell SAL to return to same context */
	ia64_os_to_sal_handoff_state.imots_context = IA64_MCA_SAME_CONTEXT;

	ia64_os_to_sal_handoff_state.imots_new_min_state =
		(u64 *)ia64_sal_to_os_handoff_state.pal_min_state;

}

/*
 * ia64_mca_ucmc_handler
 *
 *	This is uncorrectable machine check handler called from OS_MCA
 *	dispatch code which is in turn called from SAL_CHECK().
 *	This is the place where the core of OS MCA handling is done.
 *	Right now the logs are extracted and displayed in a well-defined
 *	format. This handler code is supposed to be run only on the
 *	monarch processor. Once the monarch is done with MCA handling
 *	further MCA logging is enabled by clearing logs.
 *	Monarch also has the duty of sending wakeup-IPIs to pull the
 *	slave processors out of rendezvous spinloop.
 *
 *  Inputs  :   None
 *  Outputs :   None
 */
void
ia64_mca_ucmc_handler(void)
{
	pal_processor_state_info_t *psp = (pal_processor_state_info_t *)
		&ia64_sal_to_os_handoff_state.proc_state_param;
	int recover = psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc);

	/* Get the MCA error record and log it */
	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA);

	/*
	 *  Wakeup all the processors which are spinning in the rendezvous
	 *  loop.
	 */
	ia64_mca_wakeup_all();

	/* Return to SAL */
	ia64_return_to_sal_check(recover);
}

/*
 * ia64_mca_cmc_int_handler
 *
 *  This is corrected machine check interrupt handler.
 *	Right now the logs are extracted and displayed in a well-defined
 *	format.
 *
 * Inputs
 *      interrupt number
 *      client data arg ptr
 *      saved registers ptr
 *
 * Outputs
 *	None
 */
static void
ia64_mca_cmc_int_handler(int cmc_irq, void *arg, struct pt_regs *ptregs)
{
	static unsigned long	cmc_history[CMC_HISTORY_LENGTH];
	static int		index;
	static spinlock_t	cmc_history_lock = SPIN_LOCK_UNLOCKED;

	IA64_MCA_DEBUG("%s: received interrupt vector = %#x on CPU %d\n",
		       __FUNCTION__, cmc_irq, smp_processor_id());

	/* SAL spec states this should run w/ interrupts enabled */
	local_irq_enable();

	/* Get the CMC error record and log it */
	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CMC);

	spin_lock(&cmc_history_lock);
	if (!cmc_polling_enabled) {
		int i, count = 1; /* we know 1 happened now */
		unsigned long now = jiffies;

		for (i = 0; i < CMC_HISTORY_LENGTH; i++) {
			if (now - cmc_history[i] <= HZ)
				count++;
		}

		IA64_MCA_DEBUG(KERN_INFO "CMC threshold %d/%d\n", count, CMC_HISTORY_LENGTH);
		if (count >= CMC_HISTORY_LENGTH) {

			cmc_polling_enabled = 1;
			spin_unlock(&cmc_history_lock);
			schedule_task(&cmc_disable_tq);

			/*
			 * Corrected errors will still be corrected, but