[GitHub/mt8127/android_kernel_alcatel_ttab.git] / virt / kvm / irq_comm.c

/*
 * irq_comm.c: Common API for in kernel interrupt controller
 * Copyright (c) 2007, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 * Authors:
 *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
 *
 */

#include <linux/kvm_host.h>
#include <trace/events/kvm.h>

#include <asm/msidef.h>
#ifdef CONFIG_IA64
#include <asm/iosapic.h>
#endif

#include "irq.h"

#include "ioapic.h"

static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
			   struct kvm *kvm, int level)
{
#ifdef CONFIG_X86
	return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
#else
	return -1;
#endif
}

static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
			      struct kvm *kvm, int level)
{
	return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
}

inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
{
#ifdef CONFIG_IA64
	return irq->delivery_mode ==
		(IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
#else
	return irq->delivery_mode == APIC_DM_LOWEST;
#endif
}

int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
		struct kvm_lapic_irq *irq)
{
	int i, r = -1;
	struct kvm_vcpu *vcpu, *lowest = NULL;

	WARN_ON(!mutex_is_locked(&kvm->irq_lock));

	if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
			kvm_is_dm_lowest_prio(irq))
		printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");

	kvm_for_each_vcpu(i, vcpu, kvm) {
		if (!kvm_apic_present(vcpu))
			continue;

		if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
					irq->dest_id, irq->dest_mode))
			continue;

		if (!kvm_is_dm_lowest_prio(irq)) {
			if (r < 0)
				r = 0;
			r += kvm_apic_set_irq(vcpu, irq);
		} else {
			if (!lowest)
				lowest = vcpu;
			else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
				lowest = vcpu;
		}
	}

	if (lowest)
		r = kvm_apic_set_irq(lowest, irq);

	return r;
}

static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
		       struct kvm *kvm, int level)
{
	struct kvm_lapic_irq irq;

	irq.dest_id = (e->msi.address_lo &
			MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
	irq.vector = (e->msi.data &
			MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
	irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
	irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
	irq.delivery_mode = e->msi.data & 0x700;
	irq.level = 1;
	irq.shorthand = 0;

	/* TODO Deal with RH bit of MSI message address */
	return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
}

/* This should be called with the kvm->irq_lock mutex held
 * Return value:
 *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
 *  = 0   Interrupt was coalesced (previous irq is still pending)
 *  > 0   Number of CPUs interrupt was delivered to
 */
int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
{
	struct kvm_kernel_irq_routing_entry *e;
	unsigned long *irq_state, sig_level;
	int ret = -1;

	trace_kvm_set_irq(irq, level, irq_source_id);

	WARN_ON(!mutex_is_locked(&kvm->irq_lock));

	if (irq < KVM_IOAPIC_NUM_PINS) {
		irq_state = (unsigned long *)&kvm->arch.irq_states[irq];

		/* Logical OR for level trig interrupt */
		if (level)
			set_bit(irq_source_id, irq_state);
		else
			clear_bit(irq_source_id, irq_state);
		sig_level = !!(*irq_state);
	} else if (!level)
		return ret;
	else /* Deal with MSI/MSI-X */
		sig_level = 1;

	/* Not possible to detect if the guest uses the PIC or the
	 * IOAPIC.  So set the bit in both. The guest will ignore
	 * writes to the unused one.
	 */
	list_for_each_entry(e, &kvm->irq_routing, link)
		if (e->gsi == irq) {
			int r = e->set(e, kvm, sig_level);
			if (r < 0)
				continue;

			ret = r + ((ret < 0) ? 0 : ret);
		}
	return ret;
}

void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
{
	struct kvm_kernel_irq_routing_entry *e;
	struct kvm_irq_ack_notifier *kian;
	struct hlist_node *n;
	unsigned gsi = pin;

	trace_kvm_ack_irq(irqchip, pin);

	list_for_each_entry(e, &kvm->irq_routing, link)
		if (e->type == KVM_IRQ_ROUTING_IRQCHIP &&
		    e->irqchip.irqchip == irqchip &&
		    e->irqchip.pin == pin) {
			gsi = e->gsi;
			break;
		}

	hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
		if (kian->gsi == gsi)
			kian->irq_acked(kian);
}

void kvm_register_irq_ack_notifier(struct kvm *kvm,
				   struct kvm_irq_ack_notifier *kian)
{
	mutex_lock(&kvm->irq_lock);
	hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
	mutex_unlock(&kvm->irq_lock);
}

void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
				    struct kvm_irq_ack_notifier *kian)
{
	mutex_lock(&kvm->irq_lock);
	hlist_del_init(&kian->link);
	mutex_unlock(&kvm->irq_lock);
}

int kvm_request_irq_source_id(struct kvm *kvm)
{
	unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
	int irq_source_id;

	mutex_lock(&kvm->irq_lock);
	irq_source_id = find_first_zero_bit(bitmap,
				sizeof(kvm->arch.irq_sources_bitmap));

	if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
		printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
		return -EFAULT;
	}

	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
	set_bit(irq_source_id, bitmap);
	mutex_unlock(&kvm->irq_lock);

	return irq_source_id;
}

void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
{
	int i;

	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);

	mutex_lock(&kvm->irq_lock);
	if (irq_source_id < 0 ||
	    irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
		printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
		return;
	}
	for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
		clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
	clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
	mutex_unlock(&kvm->irq_lock);
}

void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
				    struct kvm_irq_mask_notifier *kimn)
{
	mutex_lock(&kvm->irq_lock);
	kimn->irq = irq;
	hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
	mutex_unlock(&kvm->irq_lock);
}

void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
				      struct kvm_irq_mask_notifier *kimn)
{
	mutex_lock(&kvm->irq_lock);
	hlist_del(&kimn->link);
	mutex_unlock(&kvm->irq_lock);
}

void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
{
	struct kvm_irq_mask_notifier *kimn;
	struct hlist_node *n;

	WARN_ON(!mutex_is_locked(&kvm->irq_lock));

	hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
		if (kimn->irq == irq)
			kimn->func(kimn, mask);
}

static void __kvm_free_irq_routing(struct list_head *irq_routing)
{
	struct kvm_kernel_irq_routing_entry *e, *n;

	list_for_each_entry_safe(e, n, irq_routing, link)
		kfree(e);
}

void kvm_free_irq_routing(struct kvm *kvm)
{
	mutex_lock(&kvm->irq_lock);
	__kvm_free_irq_routing(&kvm->irq_routing);
	mutex_unlock(&kvm->irq_lock);
}

static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
			       const struct kvm_irq_routing_entry *ue)
{
	int r = -EINVAL;
	int delta;

	e->gsi = ue->gsi;
	e->type = ue->type;
	switch (ue->type) {
	case KVM_IRQ_ROUTING_IRQCHIP:
		delta = 0;
		switch (ue->u.irqchip.irqchip) {
		case KVM_IRQCHIP_PIC_MASTER:
			e->set = kvm_set_pic_irq;
			break;
		case KVM_IRQCHIP_PIC_SLAVE:
			e->set = kvm_set_pic_irq;
			delta = 8;
			break;
		case KVM_IRQCHIP_IOAPIC:
			e->set = kvm_set_ioapic_irq;
			break;
		default:
			goto out;
		}
		e->irqchip.irqchip = ue->u.irqchip.irqchip;
		e->irqchip.pin = ue->u.irqchip.pin + delta;
		break;
	case KVM_IRQ_ROUTING_MSI:
		e->set = kvm_set_msi;
		e->msi.address_lo = ue->u.msi.address_lo;
		e->msi.address_hi = ue->u.msi.address_hi;
		e->msi.data = ue->u.msi.data;
		break;
	default:
		goto out;
	}
	r = 0;
out:
	return r;
}


int kvm_set_irq_routing(struct kvm *kvm,
			const struct kvm_irq_routing_entry *ue,
			unsigned nr,
			unsigned flags)
{
	struct list_head irq_list = LIST_HEAD_INIT(irq_list);
	struct list_head tmp = LIST_HEAD_INIT(tmp);
	struct kvm_kernel_irq_routing_entry *e = NULL;
	unsigned i;
	int r;

	for (i = 0; i < nr; ++i) {
		r = -EINVAL;
		if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
			goto out;
		if (ue->flags)
			goto out;
		r = -ENOMEM;
		e = kzalloc(sizeof(*e), GFP_KERNEL);
		if (!e)
			goto out;
		r = setup_routing_entry(e, ue);
		if (r)
			goto out;
		++ue;
		list_add(&e->link, &irq_list);
		e = NULL;
	}

	mutex_lock(&kvm->irq_lock);
	list_splice(&kvm->irq_routing, &tmp);
	INIT_LIST_HEAD(&kvm->irq_routing);
	list_splice(&irq_list, &kvm->irq_routing);
	INIT_LIST_HEAD(&irq_list);
	list_splice(&tmp, &irq_list);
	mutex_unlock(&kvm->irq_lock);

	r = 0;

out:
	kfree(e);
	__kvm_free_irq_routing(&irq_list);
	return r;
}

#define IOAPIC_ROUTING_ENTRY(irq) \
	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,	\
	  .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)

#ifdef CONFIG_X86
#  define PIC_ROUTING_ENTRY(irq) \
	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,	\
	  .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
#  define ROUTING_ENTRY2(irq) \
	IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
#else
#  define ROUTING_ENTRY2(irq) \
	IOAPIC_ROUTING_ENTRY(irq)
#endif

static const struct kvm_irq_routing_entry default_routing[] = {
	ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
	ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
	ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
	ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
	ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
	ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
	ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
	ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
	ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
	ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
	ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
	ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
#ifdef CONFIG_IA64
	ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
	ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
	ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
	ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
	ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
	ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
	ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
	ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
	ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
	ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
	ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
	ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
#endif
};

int kvm_setup_default_irq_routing(struct kvm *kvm)
{
	return kvm_set_irq_routing(kvm, default_routing,
				   ARRAY_SIZE(default_routing), 0);
}
Commit	Line	Data
3de42dc0 XZ	1	/*
	2	* irq_comm.c: Common API for in kernel interrupt controller
	3	* Copyright (c) 2007, Intel Corporation.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	16	* Place - Suite 330, Boston, MA 02111-1307 USA.
	17	* Authors:
	18	* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
	19	*
	20	*/
	21
	22	#include <linux/kvm_host.h>
229456fc	23	#include <trace/events/kvm.h>
79950e10	24
79950e10	25	#include <asm/msidef.h>
58c2dde1 GN	26	#ifdef CONFIG_IA64
	27	#include <asm/iosapic.h>
	28	#endif
79950e10	29
3de42dc0 XZ	30	#include "irq.h"
	31
	32	#include "ioapic.h"
	33
4925663a GN	34	static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
4925663a GN	35	struct kvm *kvm, int level)
399ec807 AK	36	{
399ec807 AK	37	#ifdef CONFIG_X86
4925663a GN	38	return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
	39	#else
	40	return -1;
399ec807 AK	41	#endif
	42	}
	43
4925663a GN	44	static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
4925663a GN	45	struct kvm *kvm, int level)
399ec807	46	{
4925663a	47	return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
399ec807 AK	48	}
399ec807 AK	49
58c2dde1	50	inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
116191b6	51	{
58c2dde1 GN	52	#ifdef CONFIG_IA64
	53	return irq->delivery_mode ==
	54	(IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
	55	#else
	56	return irq->delivery_mode == APIC_DM_LOWEST;
	57	#endif
	58	}
116191b6	59
58c2dde1 GN	60	int kvm_irq_delivery_to_apic(struct kvm kvm, struct kvm_lapic src,
	61	struct kvm_lapic_irq *irq)
	62	{
	63	int i, r = -1;
	64	struct kvm_vcpu vcpu, lowest = NULL;
	65
fa40a821 MT	66	WARN_ON(!mutex_is_locked(&kvm->irq_lock));
fa40a821 MT	67
58c2dde1 GN	68	if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
58c2dde1 GN	69	kvm_is_dm_lowest_prio(irq))
343f94fe GN	70	printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
343f94fe GN	71
988a2cae GN	72	kvm_for_each_vcpu(i, vcpu, kvm) {
988a2cae GN	73	if (!kvm_apic_present(vcpu))
343f94fe GN	74	continue;
343f94fe GN	75
58c2dde1 GN	76	if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
58c2dde1 GN	77	irq->dest_id, irq->dest_mode))
343f94fe GN	78	continue;
343f94fe GN	79
58c2dde1 GN	80	if (!kvm_is_dm_lowest_prio(irq)) {
	81	if (r < 0)
	82	r = 0;
	83	r += kvm_apic_set_irq(vcpu, irq);
e1035715	84	} else {
58c2dde1 GN	85	if (!lowest)
	86	lowest = vcpu;
	87	else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
	88	lowest = vcpu;
e1035715	89	}
343f94fe GN	90	}
343f94fe GN	91
58c2dde1 GN	92	if (lowest)
	93	r = kvm_apic_set_irq(lowest, irq);
	94
	95	return r;
116191b6 SY	96	}
116191b6 SY	97
4925663a GN	98	static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
4925663a GN	99	struct kvm *kvm, int level)
79950e10	100	{
58c2dde1	101	struct kvm_lapic_irq irq;
79950e10	102
58c2dde1	103	irq.dest_id = (e->msi.address_lo &
116191b6	104	MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
58c2dde1	105	irq.vector = (e->msi.data &
116191b6	106	MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
58c2dde1 GN	107	irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
	108	irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
	109	irq.delivery_mode = e->msi.data & 0x700;
	110	irq.level = 1;
	111	irq.shorthand = 0;
116191b6 SY	112
116191b6 SY	113	/* TODO Deal with RH bit of MSI message address */
58c2dde1	114	return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
79950e10 SY	115	}
79950e10 SY	116
fa40a821	117	/* This should be called with the kvm->irq_lock mutex held
4925663a GN	118	* Return value:
	119	* < 0 Interrupt was ignored (masked or not delivered for other reasons)
	120	* = 0 Interrupt was coalesced (previous irq is still pending)
	121	* > 0 Number of CPUs interrupt was delivered to
	122	*/
	123	int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
3de42dc0	124	{
399ec807	125	struct kvm_kernel_irq_routing_entry *e;
79950e10	126	unsigned long *irq_state, sig_level;
4925663a	127	int ret = -1;
79950e10	128
ae8c1c40	129	trace_kvm_set_irq(irq, level, irq_source_id);
229456fc	130
fa40a821 MT	131	WARN_ON(!mutex_is_locked(&kvm->irq_lock));
fa40a821 MT	132
79950e10 SY	133	if (irq < KVM_IOAPIC_NUM_PINS) {
79950e10 SY	134	irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
5550af4d	135
79950e10 SY	136	/* Logical OR for level trig interrupt */
	137	if (level)
	138	set_bit(irq_source_id, irq_state);
	139	else
	140	clear_bit(irq_source_id, irq_state);
	141	sig_level = !!(*irq_state);
07fb8bb2 MT	142	} else if (!level)
	143	return ret;
	144	else /* Deal with MSI/MSI-X */
79950e10	145	sig_level = 1;
5550af4d	146
3de42dc0 XZ	147	/* Not possible to detect if the guest uses the PIC or the
	148	* IOAPIC. So set the bit in both. The guest will ignore
	149	* writes to the unused one.
	150	*/
399ec807	151	list_for_each_entry(e, &kvm->irq_routing, link)
4925663a GN	152	if (e->gsi == irq) {
	153	int r = e->set(e, kvm, sig_level);
	154	if (r < 0)
	155	continue;
	156
	157	ret = r + ((ret < 0) ? 0 : ret);
	158	}
	159	return ret;
3de42dc0 XZ	160	}
3de42dc0 XZ	161
44882eed	162	void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
3de42dc0	163	{
44882eed	164	struct kvm_kernel_irq_routing_entry *e;
3de42dc0 XZ	165	struct kvm_irq_ack_notifier *kian;
3de42dc0 XZ	166	struct hlist_node *n;
44882eed MT	167	unsigned gsi = pin;
44882eed MT	168
229456fc MT	169	trace_kvm_ack_irq(irqchip, pin);
229456fc MT	170
44882eed	171	list_for_each_entry(e, &kvm->irq_routing, link)
5116d8f6 MT	172	if (e->type == KVM_IRQ_ROUTING_IRQCHIP &&
5116d8f6 MT	173	e->irqchip.irqchip == irqchip &&
44882eed MT	174	e->irqchip.pin == pin) {
	175	gsi = e->gsi;
	176	break;
	177	}
3de42dc0 XZ	178
	179	hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
	180	if (kian->gsi == gsi)
	181	kian->irq_acked(kian);
	182	}
	183
	184	void kvm_register_irq_ack_notifier(struct kvm *kvm,
	185	struct kvm_irq_ack_notifier *kian)
	186	{
fa40a821	187	mutex_lock(&kvm->irq_lock);
3de42dc0	188	hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
fa40a821	189	mutex_unlock(&kvm->irq_lock);
3de42dc0 XZ	190	}
3de42dc0 XZ	191
fa40a821 MT	192	void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
fa40a821 MT	193	struct kvm_irq_ack_notifier *kian)
3de42dc0	194	{
fa40a821	195	mutex_lock(&kvm->irq_lock);
fdd897e6	196	hlist_del_init(&kian->link);
fa40a821	197	mutex_unlock(&kvm->irq_lock);
3de42dc0	198	}
5550af4d	199
5550af4d SY	200	int kvm_request_irq_source_id(struct kvm *kvm)
	201	{
	202	unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
fa40a821 MT	203	int irq_source_id;
	204
	205	mutex_lock(&kvm->irq_lock);
	206	irq_source_id = find_first_zero_bit(bitmap,
5550af4d	207	sizeof(kvm->arch.irq_sources_bitmap));
61552367	208
5550af4d SY	209	if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
5550af4d SY	210	printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
61552367 MM	211	return -EFAULT;
	212	}
	213
	214	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
	215	set_bit(irq_source_id, bitmap);
fa40a821	216	mutex_unlock(&kvm->irq_lock);
61552367	217
5550af4d SY	218	return irq_source_id;
	219	}
	220
	221	void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
	222	{
	223	int i;
	224
61552367 MM	225	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
61552367 MM	226
fa40a821	227	mutex_lock(&kvm->irq_lock);
61552367	228	if (irq_source_id < 0 \|\|
5550af4d SY	229	irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
	230	printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
	231	return;
	232	}
	233	for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
	234	clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
	235	clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
fa40a821	236	mutex_unlock(&kvm->irq_lock);
5550af4d	237	}
75858a84 AK	238
	239	void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
	240	struct kvm_irq_mask_notifier *kimn)
	241	{
fa40a821	242	mutex_lock(&kvm->irq_lock);
75858a84 AK	243	kimn->irq = irq;
75858a84 AK	244	hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
fa40a821	245	mutex_unlock(&kvm->irq_lock);
75858a84 AK	246	}
	247
	248	void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
	249	struct kvm_irq_mask_notifier *kimn)
	250	{
fa40a821	251	mutex_lock(&kvm->irq_lock);
75858a84	252	hlist_del(&kimn->link);
fa40a821	253	mutex_unlock(&kvm->irq_lock);
75858a84 AK	254	}
	255
	256	void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
	257	{
	258	struct kvm_irq_mask_notifier *kimn;
	259	struct hlist_node *n;
	260
fa40a821 MT	261	WARN_ON(!mutex_is_locked(&kvm->irq_lock));
fa40a821 MT	262
75858a84 AK	263	hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
	264	if (kimn->irq == irq)
	265	kimn->func(kimn, mask);
	266	}
	267
399ec807 AK	268	static void __kvm_free_irq_routing(struct list_head *irq_routing)
	269	{
	270	struct kvm_kernel_irq_routing_entry e, n;
	271
	272	list_for_each_entry_safe(e, n, irq_routing, link)
	273	kfree(e);
	274	}
	275
	276	void kvm_free_irq_routing(struct kvm *kvm)
	277	{
fa40a821	278	mutex_lock(&kvm->irq_lock);
399ec807	279	__kvm_free_irq_routing(&kvm->irq_routing);
fa40a821	280	mutex_unlock(&kvm->irq_lock);
399ec807 AK	281	}
399ec807 AK	282
cded19f3 HE	283	static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
cded19f3 HE	284	const struct kvm_irq_routing_entry *ue)
399ec807 AK	285	{
	286	int r = -EINVAL;
	287	int delta;
	288
	289	e->gsi = ue->gsi;
5116d8f6	290	e->type = ue->type;
399ec807 AK	291	switch (ue->type) {
	292	case KVM_IRQ_ROUTING_IRQCHIP:
	293	delta = 0;
	294	switch (ue->u.irqchip.irqchip) {
	295	case KVM_IRQCHIP_PIC_MASTER:
	296	e->set = kvm_set_pic_irq;
	297	break;
	298	case KVM_IRQCHIP_PIC_SLAVE:
4925663a	299	e->set = kvm_set_pic_irq;
399ec807 AK	300	delta = 8;
	301	break;
	302	case KVM_IRQCHIP_IOAPIC:
efbc100c	303	e->set = kvm_set_ioapic_irq;
399ec807 AK	304	break;
	305	default:
	306	goto out;
	307	}
	308	e->irqchip.irqchip = ue->u.irqchip.irqchip;
	309	e->irqchip.pin = ue->u.irqchip.pin + delta;
	310	break;
79950e10 SY	311	case KVM_IRQ_ROUTING_MSI:
	312	e->set = kvm_set_msi;
	313	e->msi.address_lo = ue->u.msi.address_lo;
	314	e->msi.address_hi = ue->u.msi.address_hi;
	315	e->msi.data = ue->u.msi.data;
	316	break;
399ec807 AK	317	default:
	318	goto out;
	319	}
	320	r = 0;
	321	out:
	322	return r;
	323	}
	324
	325
	326	int kvm_set_irq_routing(struct kvm *kvm,
	327	const struct kvm_irq_routing_entry *ue,
	328	unsigned nr,
	329	unsigned flags)
	330	{
	331	struct list_head irq_list = LIST_HEAD_INIT(irq_list);
	332	struct list_head tmp = LIST_HEAD_INIT(tmp);
	333	struct kvm_kernel_irq_routing_entry *e = NULL;
	334	unsigned i;
	335	int r;
	336
	337	for (i = 0; i < nr; ++i) {
	338	r = -EINVAL;
	339	if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
	340	goto out;
	341	if (ue->flags)
	342	goto out;
	343	r = -ENOMEM;
	344	e = kzalloc(sizeof(*e), GFP_KERNEL);
	345	if (!e)
	346	goto out;
	347	r = setup_routing_entry(e, ue);
	348	if (r)
	349	goto out;
	350	++ue;
	351	list_add(&e->link, &irq_list);
	352	e = NULL;
	353	}
	354
fa40a821	355	mutex_lock(&kvm->irq_lock);
399ec807 AK	356	list_splice(&kvm->irq_routing, &tmp);
	357	INIT_LIST_HEAD(&kvm->irq_routing);
	358	list_splice(&irq_list, &kvm->irq_routing);
	359	INIT_LIST_HEAD(&irq_list);
	360	list_splice(&tmp, &irq_list);
fa40a821	361	mutex_unlock(&kvm->irq_lock);
399ec807 AK	362
	363	r = 0;
	364
	365	out:
	366	kfree(e);
	367	__kvm_free_irq_routing(&irq_list);
	368	return r;
	369	}
	370
	371	#define IOAPIC_ROUTING_ENTRY(irq) \
	372	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
	373	.u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
	374	#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
	375
	376	#ifdef CONFIG_X86
399ec807 AK	377	# define PIC_ROUTING_ENTRY(irq) \
	378	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
	379	.u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
	380	# define ROUTING_ENTRY2(irq) \
	381	IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
	382	#else
	383	# define ROUTING_ENTRY2(irq) \
	384	IOAPIC_ROUTING_ENTRY(irq)
	385	#endif
	386
	387	static const struct kvm_irq_routing_entry default_routing[] = {
	388	ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
	389	ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
	390	ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
	391	ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
	392	ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
	393	ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
	394	ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
	395	ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
	396	ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
	397	ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
	398	ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
	399	ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
	400	#ifdef CONFIG_IA64
	401	ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
	402	ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
	403	ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
	404	ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
	405	ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
	406	ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
	407	ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
	408	ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
	409	ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
	410	ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
	411	ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
	412	ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
	413	#endif
	414	};
	415
	416	int kvm_setup_default_irq_routing(struct kvm *kvm)
	417	{
	418	return kvm_set_irq_routing(kvm, default_routing,
	419	ARRAY_SIZE(default_routing), 0);
	420	}