[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / ia64 / xen / irq_xen.c

/******************************************************************************
 * arch/ia64/xen/irq_xen.c
 *
 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
 *                    VA Linux Systems Japan K.K.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/cpu.h>

#include <xen/interface/xen.h>
#include <xen/interface/callback.h>
#include <xen/events.h>

#include <asm/xen/privop.h>

#include "irq_xen.h"

/***************************************************************************
 * pv_irq_ops
 * irq operations
 */

static int
xen_assign_irq_vector(int irq)
{
	struct physdev_irq irq_op;

	irq_op.irq = irq;
	if (HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op))
		return -ENOSPC;

	return irq_op.vector;
}

static void
xen_free_irq_vector(int vector)
{
	struct physdev_irq irq_op;

	if (vector < IA64_FIRST_DEVICE_VECTOR ||
	    vector > IA64_LAST_DEVICE_VECTOR)
		return;

	irq_op.vector = vector;
	if (HYPERVISOR_physdev_op(PHYSDEVOP_free_irq_vector, &irq_op))
		printk(KERN_WARNING "%s: xen_free_irq_vecotr fail vector=%d\n",
		       __func__, vector);
}


static DEFINE_PER_CPU(int, xen_timer_irq) = -1;
static DEFINE_PER_CPU(int, xen_ipi_irq) = -1;
static DEFINE_PER_CPU(int, xen_resched_irq) = -1;
static DEFINE_PER_CPU(int, xen_cmc_irq) = -1;
static DEFINE_PER_CPU(int, xen_cmcp_irq) = -1;
static DEFINE_PER_CPU(int, xen_cpep_irq) = -1;
#define NAME_SIZE	15
static DEFINE_PER_CPU(char[NAME_SIZE], xen_timer_name);
static DEFINE_PER_CPU(char[NAME_SIZE], xen_ipi_name);
static DEFINE_PER_CPU(char[NAME_SIZE], xen_resched_name);
static DEFINE_PER_CPU(char[NAME_SIZE], xen_cmc_name);
static DEFINE_PER_CPU(char[NAME_SIZE], xen_cmcp_name);
static DEFINE_PER_CPU(char[NAME_SIZE], xen_cpep_name);
#undef NAME_SIZE

struct saved_irq {
	unsigned int irq;
	struct irqaction *action;
};
/* 16 should be far optimistic value, since only several percpu irqs
 * are registered early.
 */
#define MAX_LATE_IRQ	16
static struct saved_irq saved_percpu_irqs[MAX_LATE_IRQ];
static unsigned short late_irq_cnt;
static unsigned short saved_irq_cnt;
static int xen_slab_ready;

#ifdef CONFIG_SMP
/* Dummy stub. Though we may check XEN_RESCHEDULE_VECTOR before __do_IRQ,
 * it ends up to issue several memory accesses upon percpu data and
 * thus adds unnecessary traffic to other paths.
 */
static irqreturn_t
xen_dummy_handler(int irq, void *dev_id)
{

	return IRQ_HANDLED;
}

static struct irqaction xen_ipi_irqaction = {
	.handler =	handle_IPI,
	.flags =	IRQF_DISABLED,
	.name =		"IPI"
};

static struct irqaction xen_resched_irqaction = {
	.handler =	xen_dummy_handler,
	.flags =	IRQF_DISABLED,
	.name =		"resched"
};

static struct irqaction xen_tlb_irqaction = {
	.handler =	xen_dummy_handler,
	.flags =	IRQF_DISABLED,
	.name =		"tlb_flush"
};
#endif

/*
 * This is xen version percpu irq registration, which needs bind
 * to xen specific evtchn sub-system. One trick here is that xen
 * evtchn binding interface depends on kmalloc because related
 * port needs to be freed at device/cpu down. So we cache the
 * registration on BSP before slab is ready and then deal them
 * at later point. For rest instances happening after slab ready,
 * we hook them to xen evtchn immediately.
 *
 * FIXME: MCA is not supported by far, and thus "nomca" boot param is
 * required.
 */
static void
__xen_register_percpu_irq(unsigned int cpu, unsigned int vec,
			struct irqaction *action, int save)
{
	int irq = 0;

	if (xen_slab_ready) {
		switch (vec) {
		case IA64_TIMER_VECTOR:
			snprintf(per_cpu(xen_timer_name, cpu),
				 sizeof(per_cpu(xen_timer_name, cpu)),
				 "%s%d", action->name, cpu);
			irq = bind_virq_to_irqhandler(VIRQ_ITC, cpu,
				action->handler, action->flags,
				per_cpu(xen_timer_name, cpu), action->dev_id);
			per_cpu(xen_timer_irq, cpu) = irq;
			break;
		case IA64_IPI_RESCHEDULE:
			snprintf(per_cpu(xen_resched_name, cpu),
				 sizeof(per_cpu(xen_resched_name, cpu)),
				 "%s%d", action->name, cpu);
			irq = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, cpu,
				action->handler, action->flags,
				per_cpu(xen_resched_name, cpu), action->dev_id);
			per_cpu(xen_resched_irq, cpu) = irq;
			break;
		case IA64_IPI_VECTOR:
			snprintf(per_cpu(xen_ipi_name, cpu),
				 sizeof(per_cpu(xen_ipi_name, cpu)),
				 "%s%d", action->name, cpu);
			irq = bind_ipi_to_irqhandler(XEN_IPI_VECTOR, cpu,
				action->handler, action->flags,
				per_cpu(xen_ipi_name, cpu), action->dev_id);
			per_cpu(xen_ipi_irq, cpu) = irq;
			break;
		case IA64_CMC_VECTOR:
			snprintf(per_cpu(xen_cmc_name, cpu),
				 sizeof(per_cpu(xen_cmc_name, cpu)),
				 "%s%d", action->name, cpu);
			irq = bind_virq_to_irqhandler(VIRQ_MCA_CMC, cpu,
						action->handler,
						action->flags,
						per_cpu(xen_cmc_name, cpu),
						action->dev_id);
			per_cpu(xen_cmc_irq, cpu) = irq;
			break;
		case IA64_CMCP_VECTOR:
			snprintf(per_cpu(xen_cmcp_name, cpu),
				 sizeof(per_cpu(xen_cmcp_name, cpu)),
				 "%s%d", action->name, cpu);
			irq = bind_ipi_to_irqhandler(XEN_CMCP_VECTOR, cpu,
						action->handler,
						action->flags,
						per_cpu(xen_cmcp_name, cpu),
						action->dev_id);
			per_cpu(xen_cmcp_irq, cpu) = irq;
			break;
		case IA64_CPEP_VECTOR:
			snprintf(per_cpu(xen_cpep_name, cpu),
				 sizeof(per_cpu(xen_cpep_name, cpu)),
				 "%s%d", action->name, cpu);
			irq = bind_ipi_to_irqhandler(XEN_CPEP_VECTOR, cpu,
						action->handler,
						action->flags,
						per_cpu(xen_cpep_name, cpu),
						action->dev_id);
			per_cpu(xen_cpep_irq, cpu) = irq;
			break;
		case IA64_CPE_VECTOR:
		case IA64_MCA_RENDEZ_VECTOR:
		case IA64_PERFMON_VECTOR:
		case IA64_MCA_WAKEUP_VECTOR:
		case IA64_SPURIOUS_INT_VECTOR:
			/* No need to complain, these aren't supported. */
			break;
		default:
			printk(KERN_WARNING "Percpu irq %d is unsupported "
			       "by xen!\n", vec);
			break;
		}
		BUG_ON(irq < 0);

		if (irq > 0) {
			/*
			 * Mark percpu.  Without this, migrate_irqs() will
			 * mark the interrupt for migrations and trigger it
			 * on cpu hotplug.
			 */
			irq_set_status_flags(irq, IRQ_PER_CPU);
		}
	}

	/* For BSP, we cache registered percpu irqs, and then re-walk
	 * them when initializing APs
	 */
	if (!cpu && save) {
		BUG_ON(saved_irq_cnt == MAX_LATE_IRQ);
		saved_percpu_irqs[saved_irq_cnt].irq = vec;
		saved_percpu_irqs[saved_irq_cnt].action = action;
		saved_irq_cnt++;
		if (!xen_slab_ready)
			late_irq_cnt++;
	}
}

static void
xen_register_percpu_irq(ia64_vector vec, struct irqaction *action)
{
	__xen_register_percpu_irq(smp_processor_id(), vec, action, 1);
}

static void
xen_bind_early_percpu_irq(void)
{
	int i;

	xen_slab_ready = 1;
	/* There's no race when accessing this cached array, since only
	 * BSP will face with such step shortly
	 */
	for (i = 0; i < late_irq_cnt; i++)
		__xen_register_percpu_irq(smp_processor_id(),
					  saved_percpu_irqs[i].irq,
					  saved_percpu_irqs[i].action, 0);
}

/* FIXME: There's no obvious point to check whether slab is ready. So
 * a hack is used here by utilizing a late time hook.
 */

#ifdef CONFIG_HOTPLUG_CPU
static int __devinit
unbind_evtchn_callback(struct notifier_block *nfb,
		       unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long)hcpu;

	if (action == CPU_DEAD) {
		/* Unregister evtchn.  */
		if (per_cpu(xen_cpep_irq, cpu) >= 0) {
			unbind_from_irqhandler(per_cpu(xen_cpep_irq, cpu),
					       NULL);
			per_cpu(xen_cpep_irq, cpu) = -1;
		}
		if (per_cpu(xen_cmcp_irq, cpu) >= 0) {
			unbind_from_irqhandler(per_cpu(xen_cmcp_irq, cpu),
					       NULL);
			per_cpu(xen_cmcp_irq, cpu) = -1;
		}
		if (per_cpu(xen_cmc_irq, cpu) >= 0) {
			unbind_from_irqhandler(per_cpu(xen_cmc_irq, cpu), NULL);
			per_cpu(xen_cmc_irq, cpu) = -1;
		}
		if (per_cpu(xen_ipi_irq, cpu) >= 0) {
			unbind_from_irqhandler(per_cpu(xen_ipi_irq, cpu), NULL);
			per_cpu(xen_ipi_irq, cpu) = -1;
		}
		if (per_cpu(xen_resched_irq, cpu) >= 0) {
			unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu),
					       NULL);
			per_cpu(xen_resched_irq, cpu) = -1;
		}
		if (per_cpu(xen_timer_irq, cpu) >= 0) {
			unbind_from_irqhandler(per_cpu(xen_timer_irq, cpu),
					       NULL);
			per_cpu(xen_timer_irq, cpu) = -1;
		}
	}
	return NOTIFY_OK;
}

static struct notifier_block unbind_evtchn_notifier = {
	.notifier_call = unbind_evtchn_callback,
	.priority = 0
};
#endif

void xen_smp_intr_init_early(unsigned int cpu)
{
#ifdef CONFIG_SMP
	unsigned int i;

	for (i = 0; i < saved_irq_cnt; i++)
		__xen_register_percpu_irq(cpu, saved_percpu_irqs[i].irq,
					  saved_percpu_irqs[i].action, 0);
#endif
}

void xen_smp_intr_init(void)
{
#ifdef CONFIG_SMP
	unsigned int cpu = smp_processor_id();
	struct callback_register event = {
		.type = CALLBACKTYPE_event,
		.address = { .ip = (unsigned long)&xen_event_callback },
	};

	if (cpu == 0) {
		/* Initialization was already done for boot cpu.  */
#ifdef CONFIG_HOTPLUG_CPU
		/* Register the notifier only once.  */
		register_cpu_notifier(&unbind_evtchn_notifier);
#endif
		return;
	}

	/* This should be piggyback when setup vcpu guest context */
	BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
#endif /* CONFIG_SMP */
}

void __init
xen_irq_init(void)
{
	struct callback_register event = {
		.type = CALLBACKTYPE_event,
		.address = { .ip = (unsigned long)&xen_event_callback },
	};

	xen_init_IRQ();
	BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
	late_time_init = xen_bind_early_percpu_irq;
}

void
xen_platform_send_ipi(int cpu, int vector, int delivery_mode, int redirect)
{
#ifdef CONFIG_SMP
	/* TODO: we need to call vcpu_up here */
	if (unlikely(vector == ap_wakeup_vector)) {
		/* XXX
		 * This should be in __cpu_up(cpu) in ia64 smpboot.c
		 * like x86. But don't want to modify it,
		 * keep it untouched.
		 */
		xen_smp_intr_init_early(cpu);

		xen_send_ipi(cpu, vector);
		/* vcpu_prepare_and_up(cpu); */
		return;
	}
#endif

	switch (vector) {
	case IA64_IPI_VECTOR:
		xen_send_IPI_one(cpu, XEN_IPI_VECTOR);
		break;
	case IA64_IPI_RESCHEDULE:
		xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
		break;
	case IA64_CMCP_VECTOR:
		xen_send_IPI_one(cpu, XEN_CMCP_VECTOR);
		break;
	case IA64_CPEP_VECTOR:
		xen_send_IPI_one(cpu, XEN_CPEP_VECTOR);
		break;
	case IA64_TIMER_VECTOR: {
		/* this is used only once by check_sal_cache_flush()
		   at boot time */
		static int used = 0;
		if (!used) {
			xen_send_ipi(cpu, IA64_TIMER_VECTOR);
			used = 1;
			break;
		}
		/* fallthrough */
	}
	default:
		printk(KERN_WARNING "Unsupported IPI type 0x%x\n",
		       vector);
		notify_remote_via_irq(0); /* defaults to 0 irq */
		break;
	}
}

static void __init
xen_register_ipi(void)
{
#ifdef CONFIG_SMP
	register_percpu_irq(IA64_IPI_VECTOR, &xen_ipi_irqaction);
	register_percpu_irq(IA64_IPI_RESCHEDULE, &xen_resched_irqaction);
	register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &xen_tlb_irqaction);
#endif
}

static void
xen_resend_irq(unsigned int vector)
{
	(void)resend_irq_on_evtchn(vector);
}

const struct pv_irq_ops xen_irq_ops __initdata = {
	.register_ipi = xen_register_ipi,

	.assign_irq_vector = xen_assign_irq_vector,
	.free_irq_vector = xen_free_irq_vector,
	.register_percpu_irq = xen_register_percpu_irq,

	.resend_irq = xen_resend_irq,
};
Commit	Line	Data
7477de98 IY	1	/******************************************************************************
	2	* arch/ia64/xen/irq_xen.c
	3	*
	4	* Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
	5	* VA Linux Systems Japan K.K.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	*/
	22
	23	#include <linux/cpu.h>
	24
	25	#include <xen/interface/xen.h>
	26	#include <xen/interface/callback.h>
	27	#include <xen/events.h>
	28
	29	#include <asm/xen/privop.h>
	30
	31	#include "irq_xen.h"
	32
	33	/***************************************************************************
	34	* pv_irq_ops
	35	* irq operations
	36	*/
	37
	38	static int
	39	xen_assign_irq_vector(int irq)
	40	{
	41	struct physdev_irq irq_op;
	42
	43	irq_op.irq = irq;
	44	if (HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op))
	45	return -ENOSPC;
	46
	47	return irq_op.vector;
	48	}
	49
	50	static void
	51	xen_free_irq_vector(int vector)
	52	{
	53	struct physdev_irq irq_op;
	54
	55	if (vector < IA64_FIRST_DEVICE_VECTOR \|\|
	56	vector > IA64_LAST_DEVICE_VECTOR)
	57	return;
	58
	59	irq_op.vector = vector;
	60	if (HYPERVISOR_physdev_op(PHYSDEVOP_free_irq_vector, &irq_op))
	61	printk(KERN_WARNING "%s: xen_free_irq_vecotr fail vector=%d\n",
	62	__func__, vector);
	63	}
	64
65
c6e22f9e TH	66	static DEFINE_PER_CPU(int, xen_timer_irq) = -1;
	67	static DEFINE_PER_CPU(int, xen_ipi_irq) = -1;
	68	static DEFINE_PER_CPU(int, xen_resched_irq) = -1;
	69	static DEFINE_PER_CPU(int, xen_cmc_irq) = -1;
	70	static DEFINE_PER_CPU(int, xen_cmcp_irq) = -1;
	71	static DEFINE_PER_CPU(int, xen_cpep_irq) = -1;
7477de98	72	#define NAME_SIZE 15
c6e22f9e TH	73	static DEFINE_PER_CPU(char[NAME_SIZE], xen_timer_name);
	74	static DEFINE_PER_CPU(char[NAME_SIZE], xen_ipi_name);
	75	static DEFINE_PER_CPU(char[NAME_SIZE], xen_resched_name);
	76	static DEFINE_PER_CPU(char[NAME_SIZE], xen_cmc_name);
	77	static DEFINE_PER_CPU(char[NAME_SIZE], xen_cmcp_name);
	78	static DEFINE_PER_CPU(char[NAME_SIZE], xen_cpep_name);
7477de98 IY	79	#undef NAME_SIZE
	80
	81	struct saved_irq {
	82	unsigned int irq;
	83	struct irqaction *action;
	84	};
	85	/* 16 should be far optimistic value, since only several percpu irqs
	86	* are registered early.
	87	*/
	88	#define MAX_LATE_IRQ 16
	89	static struct saved_irq saved_percpu_irqs[MAX_LATE_IRQ];
	90	static unsigned short late_irq_cnt;
	91	static unsigned short saved_irq_cnt;
	92	static int xen_slab_ready;
	93
	94	#ifdef CONFIG_SMP
	95	/* Dummy stub. Though we may check XEN_RESCHEDULE_VECTOR before __do_IRQ,
	96	* it ends up to issue several memory accesses upon percpu data and
	97	* thus adds unnecessary traffic to other paths.
	98	*/
	99	static irqreturn_t
	100	xen_dummy_handler(int irq, void *dev_id)
	101	{
	102
	103	return IRQ_HANDLED;
	104	}
	105
	106	static struct irqaction xen_ipi_irqaction = {
	107	.handler = handle_IPI,
	108	.flags = IRQF_DISABLED,
	109	.name = "IPI"
	110	};
	111
	112	static struct irqaction xen_resched_irqaction = {
	113	.handler = xen_dummy_handler,
	114	.flags = IRQF_DISABLED,
	115	.name = "resched"
	116	};
	117
	118	static struct irqaction xen_tlb_irqaction = {
	119	.handler = xen_dummy_handler,
	120	.flags = IRQF_DISABLED,
	121	.name = "tlb_flush"
	122	};
	123	#endif
	124
	125	/*
	126	* This is xen version percpu irq registration, which needs bind
	127	* to xen specific evtchn sub-system. One trick here is that xen
	128	* evtchn binding interface depends on kmalloc because related
	129	* port needs to be freed at device/cpu down. So we cache the
	130	* registration on BSP before slab is ready and then deal them
	131	* at later point. For rest instances happening after slab ready,
	132	* we hook them to xen evtchn immediately.
	133	*
	134	* FIXME: MCA is not supported by far, and thus "nomca" boot param is
	135	* required.
	136	*/
	137	static void
	138	__xen_register_percpu_irq(unsigned int cpu, unsigned int vec,
	139	struct irqaction *action, int save)
	140	{
7477de98 IY	141	int irq = 0;
	142
	143	if (xen_slab_ready) {
	144	switch (vec) {
	145	case IA64_TIMER_VECTOR:
c6e22f9e TH	146	snprintf(per_cpu(xen_timer_name, cpu),
c6e22f9e TH	147	sizeof(per_cpu(xen_timer_name, cpu)),
7477de98 IY	148	"%s%d", action->name, cpu);
	149	irq = bind_virq_to_irqhandler(VIRQ_ITC, cpu,
	150	action->handler, action->flags,
c6e22f9e TH	151	per_cpu(xen_timer_name, cpu), action->dev_id);
c6e22f9e TH	152	per_cpu(xen_timer_irq, cpu) = irq;
7477de98 IY	153	break;
7477de98 IY	154	case IA64_IPI_RESCHEDULE:
c6e22f9e TH	155	snprintf(per_cpu(xen_resched_name, cpu),
c6e22f9e TH	156	sizeof(per_cpu(xen_resched_name, cpu)),
7477de98 IY	157	"%s%d", action->name, cpu);
	158	irq = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, cpu,
	159	action->handler, action->flags,
c6e22f9e TH	160	per_cpu(xen_resched_name, cpu), action->dev_id);
c6e22f9e TH	161	per_cpu(xen_resched_irq, cpu) = irq;
7477de98 IY	162	break;
7477de98 IY	163	case IA64_IPI_VECTOR:
c6e22f9e TH	164	snprintf(per_cpu(xen_ipi_name, cpu),
c6e22f9e TH	165	sizeof(per_cpu(xen_ipi_name, cpu)),
7477de98 IY	166	"%s%d", action->name, cpu);
	167	irq = bind_ipi_to_irqhandler(XEN_IPI_VECTOR, cpu,
	168	action->handler, action->flags,
c6e22f9e TH	169	per_cpu(xen_ipi_name, cpu), action->dev_id);
c6e22f9e TH	170	per_cpu(xen_ipi_irq, cpu) = irq;
7477de98 IY	171	break;
7477de98 IY	172	case IA64_CMC_VECTOR:
c6e22f9e TH	173	snprintf(per_cpu(xen_cmc_name, cpu),
c6e22f9e TH	174	sizeof(per_cpu(xen_cmc_name, cpu)),
7477de98 IY	175	"%s%d", action->name, cpu);
7477de98 IY	176	irq = bind_virq_to_irqhandler(VIRQ_MCA_CMC, cpu,
c6e22f9e TH	177	action->handler,
	178	action->flags,
	179	per_cpu(xen_cmc_name, cpu),
	180	action->dev_id);
	181	per_cpu(xen_cmc_irq, cpu) = irq;
7477de98 IY	182	break;
7477de98 IY	183	case IA64_CMCP_VECTOR:
c6e22f9e TH	184	snprintf(per_cpu(xen_cmcp_name, cpu),
c6e22f9e TH	185	sizeof(per_cpu(xen_cmcp_name, cpu)),
7477de98 IY	186	"%s%d", action->name, cpu);
7477de98 IY	187	irq = bind_ipi_to_irqhandler(XEN_CMCP_VECTOR, cpu,
c6e22f9e TH	188	action->handler,
	189	action->flags,
	190	per_cpu(xen_cmcp_name, cpu),
	191	action->dev_id);
	192	per_cpu(xen_cmcp_irq, cpu) = irq;
7477de98 IY	193	break;
7477de98 IY	194	case IA64_CPEP_VECTOR:
c6e22f9e TH	195	snprintf(per_cpu(xen_cpep_name, cpu),
c6e22f9e TH	196	sizeof(per_cpu(xen_cpep_name, cpu)),
7477de98 IY	197	"%s%d", action->name, cpu);
7477de98 IY	198	irq = bind_ipi_to_irqhandler(XEN_CPEP_VECTOR, cpu,
c6e22f9e TH	199	action->handler,
	200	action->flags,
	201	per_cpu(xen_cpep_name, cpu),
	202	action->dev_id);
	203	per_cpu(xen_cpep_irq, cpu) = irq;
7477de98 IY	204	break;
	205	case IA64_CPE_VECTOR:
	206	case IA64_MCA_RENDEZ_VECTOR:
	207	case IA64_PERFMON_VECTOR:
	208	case IA64_MCA_WAKEUP_VECTOR:
	209	case IA64_SPURIOUS_INT_VECTOR:
	210	/* No need to complain, these aren't supported. */
	211	break;
	212	default:
	213	printk(KERN_WARNING "Percpu irq %d is unsupported "
	214	"by xen!\n", vec);
	215	break;
	216	}
	217	BUG_ON(irq < 0);
	218
	219	if (irq > 0) {
	220	/*
	221	* Mark percpu. Without this, migrate_irqs() will
	222	* mark the interrupt for migrations and trigger it
	223	* on cpu hotplug.
	224	*/
41ef0203	225	irq_set_status_flags(irq, IRQ_PER_CPU);
7477de98 IY	226	}
	227	}
	228
	229	/* For BSP, we cache registered percpu irqs, and then re-walk
	230	* them when initializing APs
	231	*/
	232	if (!cpu && save) {
	233	BUG_ON(saved_irq_cnt == MAX_LATE_IRQ);
	234	saved_percpu_irqs[saved_irq_cnt].irq = vec;
	235	saved_percpu_irqs[saved_irq_cnt].action = action;
	236	saved_irq_cnt++;
	237	if (!xen_slab_ready)
	238	late_irq_cnt++;
	239	}
	240	}
	241
	242	static void
	243	xen_register_percpu_irq(ia64_vector vec, struct irqaction *action)
	244	{
	245	__xen_register_percpu_irq(smp_processor_id(), vec, action, 1);
	246	}
	247
	248	static void
	249	xen_bind_early_percpu_irq(void)
	250	{
	251	int i;
	252
	253	xen_slab_ready = 1;
	254	/* There's no race when accessing this cached array, since only
	255	* BSP will face with such step shortly
	256	*/
	257	for (i = 0; i < late_irq_cnt; i++)
	258	__xen_register_percpu_irq(smp_processor_id(),
	259	saved_percpu_irqs[i].irq,
	260	saved_percpu_irqs[i].action, 0);
	261	}
	262
	263	/* FIXME: There's no obvious point to check whether slab is ready. So
	264	* a hack is used here by utilizing a late time hook.
	265	*/
	266
	267	#ifdef CONFIG_HOTPLUG_CPU
	268	static int __devinit
	269	unbind_evtchn_callback(struct notifier_block *nfb,
	270	unsigned long action, void *hcpu)
	271	{
	272	unsigned int cpu = (unsigned long)hcpu;
	273
	274	if (action == CPU_DEAD) {
	275	/* Unregister evtchn. */
c6e22f9e TH	276	if (per_cpu(xen_cpep_irq, cpu) >= 0) {
	277	unbind_from_irqhandler(per_cpu(xen_cpep_irq, cpu),
	278	NULL);
	279	per_cpu(xen_cpep_irq, cpu) = -1;
7477de98	280	}
c6e22f9e TH	281	if (per_cpu(xen_cmcp_irq, cpu) >= 0) {
	282	unbind_from_irqhandler(per_cpu(xen_cmcp_irq, cpu),
	283	NULL);
	284	per_cpu(xen_cmcp_irq, cpu) = -1;
7477de98	285	}
c6e22f9e TH	286	if (per_cpu(xen_cmc_irq, cpu) >= 0) {
	287	unbind_from_irqhandler(per_cpu(xen_cmc_irq, cpu), NULL);
	288	per_cpu(xen_cmc_irq, cpu) = -1;
7477de98	289	}
c6e22f9e TH	290	if (per_cpu(xen_ipi_irq, cpu) >= 0) {
	291	unbind_from_irqhandler(per_cpu(xen_ipi_irq, cpu), NULL);
	292	per_cpu(xen_ipi_irq, cpu) = -1;
7477de98	293	}
c6e22f9e TH	294	if (per_cpu(xen_resched_irq, cpu) >= 0) {
	295	unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu),
	296	NULL);
	297	per_cpu(xen_resched_irq, cpu) = -1;
7477de98	298	}
c6e22f9e TH	299	if (per_cpu(xen_timer_irq, cpu) >= 0) {
	300	unbind_from_irqhandler(per_cpu(xen_timer_irq, cpu),
	301	NULL);
	302	per_cpu(xen_timer_irq, cpu) = -1;
7477de98 IY	303	}
	304	}
	305	return NOTIFY_OK;
	306	}
	307
	308	static struct notifier_block unbind_evtchn_notifier = {
	309	.notifier_call = unbind_evtchn_callback,
	310	.priority = 0
	311	};
	312	#endif
	313
	314	void xen_smp_intr_init_early(unsigned int cpu)
	315	{
	316	#ifdef CONFIG_SMP
	317	unsigned int i;
	318
	319	for (i = 0; i < saved_irq_cnt; i++)
	320	__xen_register_percpu_irq(cpu, saved_percpu_irqs[i].irq,
	321	saved_percpu_irqs[i].action, 0);
	322	#endif
	323	}
	324
	325	void xen_smp_intr_init(void)
	326	{
	327	#ifdef CONFIG_SMP
	328	unsigned int cpu = smp_processor_id();
	329	struct callback_register event = {
	330	.type = CALLBACKTYPE_event,
	331	.address = { .ip = (unsigned long)&xen_event_callback },
	332	};
	333
	334	if (cpu == 0) {
	335	/* Initialization was already done for boot cpu. */
	336	#ifdef CONFIG_HOTPLUG_CPU
	337	/* Register the notifier only once. */
	338	register_cpu_notifier(&unbind_evtchn_notifier);
	339	#endif
	340	return;
	341	}
	342
	343	/* This should be piggyback when setup vcpu guest context */
	344	BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
	345	#endif /* CONFIG_SMP */
	346	}
	347
	348	void __init
	349	xen_irq_init(void)
	350	{
	351	struct callback_register event = {
	352	.type = CALLBACKTYPE_event,
	353	.address = { .ip = (unsigned long)&xen_event_callback },
	354	};
	355
	356	xen_init_IRQ();
	357	BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
	358	late_time_init = xen_bind_early_percpu_irq;
	359	}
	360
	361	void
	362	xen_platform_send_ipi(int cpu, int vector, int delivery_mode, int redirect)
	363	{
	364	#ifdef CONFIG_SMP
	365	/* TODO: we need to call vcpu_up here */
	366	if (unlikely(vector == ap_wakeup_vector)) {
367	/* XXX
368	* This should be in __cpu_up(cpu) in ia64 smpboot.c
369	* like x86. But don't want to modify it,
370	* keep it untouched.
371	*/
372	xen_smp_intr_init_early(cpu);
373
374	xen_send_ipi(cpu, vector);
375	/* vcpu_prepare_and_up(cpu); */
376	return;
377	}
378	#endif
379
380	switch (vector) {
381	case IA64_IPI_VECTOR:
382	xen_send_IPI_one(cpu, XEN_IPI_VECTOR);
383	break;
384	case IA64_IPI_RESCHEDULE:
385	xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
386	break;
387	case IA64_CMCP_VECTOR:
388	xen_send_IPI_one(cpu, XEN_CMCP_VECTOR);
389	break;
390	case IA64_CPEP_VECTOR:
391	xen_send_IPI_one(cpu, XEN_CPEP_VECTOR);
392	break;
393	case IA64_TIMER_VECTOR: {
394	/* this is used only once by check_sal_cache_flush()
395	at boot time */
396	static int used = 0;
397	if (!used) {
398	xen_send_ipi(cpu, IA64_TIMER_VECTOR);
399	used = 1;
400	break;
401	}
402	/* fallthrough */
403	}
404	default:
405	printk(KERN_WARNING "Unsupported IPI type 0x%x\n",
406	vector);
407	notify_remote_via_irq(0); /* defaults to 0 irq */
408	break;
409	}
410	}
411
412	static void __init
413	xen_register_ipi(void)
414	{
415	#ifdef CONFIG_SMP
416	register_percpu_irq(IA64_IPI_VECTOR, &xen_ipi_irqaction);
417	register_percpu_irq(IA64_IPI_RESCHEDULE, &xen_resched_irqaction);
418	register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &xen_tlb_irqaction);
419	#endif
420	}
421
422	static void
423	xen_resend_irq(unsigned int vector)
424	{
425	(void)resend_irq_on_evtchn(vector);
426	}
427
428	const struct pv_irq_ops xen_irq_ops __initdata = {
429	.register_ipi = xen_register_ipi,
430
431	.assign_irq_vector = xen_assign_irq_vector,
432	.free_irq_vector = xen_free_irq_vector,
433	.register_percpu_irq = xen_register_percpu_irq,
434
435	.resend_irq = xen_resend_irq,
436	};