[net-next-2.6.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 <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");

	for (i = 0; i < KVM_MAX_VCPUS; i++) {
		vcpu = kvm->vcpus[i];

		if (!vcpu || !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;

	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 /* 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;

	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>
79950e10	23
79950e10	24	#include <asm/msidef.h>
58c2dde1 GN	25	#ifdef CONFIG_IA64
	26	#include <asm/iosapic.h>
	27	#endif
79950e10	28
3de42dc0 XZ	29	#include "irq.h"
	30
	31	#include "ioapic.h"
	32
4925663a GN	33	static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
4925663a GN	34	struct kvm *kvm, int level)
399ec807 AK	35	{
399ec807 AK	36	#ifdef CONFIG_X86
4925663a GN	37	return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
	38	#else
	39	return -1;
399ec807 AK	40	#endif
	41	}
	42
4925663a GN	43	static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
4925663a GN	44	struct kvm *kvm, int level)
399ec807	45	{
4925663a	46	return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
399ec807 AK	47	}
399ec807 AK	48
58c2dde1	49	inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
116191b6	50	{
58c2dde1 GN	51	#ifdef CONFIG_IA64
	52	return irq->delivery_mode ==
	53	(IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
	54	#else
	55	return irq->delivery_mode == APIC_DM_LOWEST;
	56	#endif
	57	}
116191b6	58
58c2dde1 GN	59	int kvm_irq_delivery_to_apic(struct kvm kvm, struct kvm_lapic src,
	60	struct kvm_lapic_irq *irq)
	61	{
	62	int i, r = -1;
	63	struct kvm_vcpu vcpu, lowest = NULL;
	64
fa40a821 MT	65	WARN_ON(!mutex_is_locked(&kvm->irq_lock));
fa40a821 MT	66
58c2dde1 GN	67	if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
58c2dde1 GN	68	kvm_is_dm_lowest_prio(irq))
343f94fe GN	69	printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
343f94fe GN	70
343f94fe GN	71	for (i = 0; i < KVM_MAX_VCPUS; i++) {
343f94fe GN	72	vcpu = kvm->vcpus[i];
74a3a8f1	73
343f94fe GN	74	if (!vcpu \|\| !kvm_apic_present(vcpu))
	75	continue;
	76
58c2dde1 GN	77	if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
58c2dde1 GN	78	irq->dest_id, irq->dest_mode))
343f94fe GN	79	continue;
343f94fe GN	80
58c2dde1 GN	81	if (!kvm_is_dm_lowest_prio(irq)) {
	82	if (r < 0)
	83	r = 0;
	84	r += kvm_apic_set_irq(vcpu, irq);
e1035715	85	} else {
58c2dde1 GN	86	if (!lowest)
	87	lowest = vcpu;
	88	else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
	89	lowest = vcpu;
e1035715	90	}
343f94fe GN	91	}
343f94fe GN	92
58c2dde1 GN	93	if (lowest)
	94	r = kvm_apic_set_irq(lowest, irq);
	95
	96	return r;
116191b6 SY	97	}
116191b6 SY	98
4925663a GN	99	static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
4925663a GN	100	struct kvm *kvm, int level)
79950e10	101	{
58c2dde1	102	struct kvm_lapic_irq irq;
79950e10	103
58c2dde1	104	irq.dest_id = (e->msi.address_lo &
116191b6	105	MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
58c2dde1	106	irq.vector = (e->msi.data &
116191b6	107	MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
58c2dde1 GN	108	irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
	109	irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
	110	irq.delivery_mode = e->msi.data & 0x700;
	111	irq.level = 1;
	112	irq.shorthand = 0;
116191b6 SY	113
116191b6 SY	114	/* TODO Deal with RH bit of MSI message address */
58c2dde1	115	return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
79950e10 SY	116	}
79950e10 SY	117
fa40a821	118	/* This should be called with the kvm->irq_lock mutex held
4925663a GN	119	* Return value:
	120	* < 0 Interrupt was ignored (masked or not delivered for other reasons)
	121	* = 0 Interrupt was coalesced (previous irq is still pending)
	122	* > 0 Number of CPUs interrupt was delivered to
	123	*/
	124	int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
3de42dc0	125	{
399ec807	126	struct kvm_kernel_irq_routing_entry *e;
79950e10	127	unsigned long *irq_state, sig_level;
4925663a	128	int ret = -1;
79950e10	129
fa40a821 MT	130	WARN_ON(!mutex_is_locked(&kvm->irq_lock));
fa40a821 MT	131
79950e10 SY	132	if (irq < KVM_IOAPIC_NUM_PINS) {
79950e10 SY	133	irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
5550af4d	134
79950e10 SY	135	/* Logical OR for level trig interrupt */
	136	if (level)
	137	set_bit(irq_source_id, irq_state);
	138	else
	139	clear_bit(irq_source_id, irq_state);
	140	sig_level = !!(*irq_state);
	141	} else /* Deal with MSI/MSI-X */
	142	sig_level = 1;
5550af4d	143
3de42dc0 XZ	144	/* Not possible to detect if the guest uses the PIC or the
	145	* IOAPIC. So set the bit in both. The guest will ignore
	146	* writes to the unused one.
	147	*/
399ec807	148	list_for_each_entry(e, &kvm->irq_routing, link)
4925663a GN	149	if (e->gsi == irq) {
	150	int r = e->set(e, kvm, sig_level);
	151	if (r < 0)
	152	continue;
	153
	154	ret = r + ((ret < 0) ? 0 : ret);
	155	}
	156	return ret;
3de42dc0 XZ	157	}
3de42dc0 XZ	158
44882eed	159	void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
3de42dc0	160	{
44882eed	161	struct kvm_kernel_irq_routing_entry *e;
3de42dc0 XZ	162	struct kvm_irq_ack_notifier *kian;
3de42dc0 XZ	163	struct hlist_node *n;
44882eed MT	164	unsigned gsi = pin;
	165
	166	list_for_each_entry(e, &kvm->irq_routing, link)
5116d8f6 MT	167	if (e->type == KVM_IRQ_ROUTING_IRQCHIP &&
5116d8f6 MT	168	e->irqchip.irqchip == irqchip &&
44882eed MT	169	e->irqchip.pin == pin) {
	170	gsi = e->gsi;
	171	break;
	172	}
3de42dc0 XZ	173
	174	hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
	175	if (kian->gsi == gsi)
	176	kian->irq_acked(kian);
	177	}
	178
	179	void kvm_register_irq_ack_notifier(struct kvm *kvm,
	180	struct kvm_irq_ack_notifier *kian)
	181	{
fa40a821	182	mutex_lock(&kvm->irq_lock);
3de42dc0	183	hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
fa40a821	184	mutex_unlock(&kvm->irq_lock);
3de42dc0 XZ	185	}
3de42dc0 XZ	186
fa40a821 MT	187	void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
fa40a821 MT	188	struct kvm_irq_ack_notifier *kian)
3de42dc0	189	{
fa40a821	190	mutex_lock(&kvm->irq_lock);
fdd897e6	191	hlist_del_init(&kian->link);
fa40a821	192	mutex_unlock(&kvm->irq_lock);
3de42dc0	193	}
5550af4d	194
5550af4d SY	195	int kvm_request_irq_source_id(struct kvm *kvm)
	196	{
	197	unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
fa40a821 MT	198	int irq_source_id;
	199
	200	mutex_lock(&kvm->irq_lock);
	201	irq_source_id = find_first_zero_bit(bitmap,
5550af4d	202	sizeof(kvm->arch.irq_sources_bitmap));
61552367	203
5550af4d SY	204	if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
5550af4d SY	205	printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
61552367 MM	206	return -EFAULT;
	207	}
	208
	209	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
	210	set_bit(irq_source_id, bitmap);
fa40a821	211	mutex_unlock(&kvm->irq_lock);
61552367	212
5550af4d SY	213	return irq_source_id;
	214	}
	215
	216	void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
	217	{
	218	int i;
	219
61552367 MM	220	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
61552367 MM	221
fa40a821	222	mutex_lock(&kvm->irq_lock);
61552367	223	if (irq_source_id < 0 \|\|
5550af4d SY	224	irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
	225	printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
	226	return;
	227	}
	228	for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
	229	clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
	230	clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
fa40a821	231	mutex_unlock(&kvm->irq_lock);
5550af4d	232	}
75858a84 AK	233
	234	void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
	235	struct kvm_irq_mask_notifier *kimn)
	236	{
fa40a821	237	mutex_lock(&kvm->irq_lock);
75858a84 AK	238	kimn->irq = irq;
75858a84 AK	239	hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
fa40a821	240	mutex_unlock(&kvm->irq_lock);
75858a84 AK	241	}
	242
	243	void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
	244	struct kvm_irq_mask_notifier *kimn)
	245	{
fa40a821	246	mutex_lock(&kvm->irq_lock);
75858a84	247	hlist_del(&kimn->link);
fa40a821	248	mutex_unlock(&kvm->irq_lock);
75858a84 AK	249	}
	250
	251	void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
	252	{
	253	struct kvm_irq_mask_notifier *kimn;
	254	struct hlist_node *n;
	255
fa40a821 MT	256	WARN_ON(!mutex_is_locked(&kvm->irq_lock));
fa40a821 MT	257
75858a84 AK	258	hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
	259	if (kimn->irq == irq)
	260	kimn->func(kimn, mask);
	261	}
	262
399ec807 AK	263	static void __kvm_free_irq_routing(struct list_head *irq_routing)
	264	{
	265	struct kvm_kernel_irq_routing_entry e, n;
	266
	267	list_for_each_entry_safe(e, n, irq_routing, link)
	268	kfree(e);
	269	}
	270
	271	void kvm_free_irq_routing(struct kvm *kvm)
	272	{
fa40a821	273	mutex_lock(&kvm->irq_lock);
399ec807	274	__kvm_free_irq_routing(&kvm->irq_routing);
fa40a821	275	mutex_unlock(&kvm->irq_lock);
399ec807 AK	276	}
399ec807 AK	277
cded19f3 HE	278	static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
cded19f3 HE	279	const struct kvm_irq_routing_entry *ue)
399ec807 AK	280	{
	281	int r = -EINVAL;
	282	int delta;
	283
	284	e->gsi = ue->gsi;
5116d8f6	285	e->type = ue->type;
399ec807 AK	286	switch (ue->type) {
	287	case KVM_IRQ_ROUTING_IRQCHIP:
	288	delta = 0;
	289	switch (ue->u.irqchip.irqchip) {
	290	case KVM_IRQCHIP_PIC_MASTER:
	291	e->set = kvm_set_pic_irq;
	292	break;
	293	case KVM_IRQCHIP_PIC_SLAVE:
4925663a	294	e->set = kvm_set_pic_irq;
399ec807 AK	295	delta = 8;
	296	break;
	297	case KVM_IRQCHIP_IOAPIC:
efbc100c	298	e->set = kvm_set_ioapic_irq;
399ec807 AK	299	break;
	300	default:
	301	goto out;
	302	}
	303	e->irqchip.irqchip = ue->u.irqchip.irqchip;
	304	e->irqchip.pin = ue->u.irqchip.pin + delta;
	305	break;
79950e10 SY	306	case KVM_IRQ_ROUTING_MSI:
	307	e->set = kvm_set_msi;
	308	e->msi.address_lo = ue->u.msi.address_lo;
	309	e->msi.address_hi = ue->u.msi.address_hi;
	310	e->msi.data = ue->u.msi.data;
	311	break;
399ec807 AK	312	default:
	313	goto out;
	314	}
	315	r = 0;
	316	out:
	317	return r;
	318	}
	319
	320
	321	int kvm_set_irq_routing(struct kvm *kvm,
	322	const struct kvm_irq_routing_entry *ue,
	323	unsigned nr,
	324	unsigned flags)
	325	{
	326	struct list_head irq_list = LIST_HEAD_INIT(irq_list);
	327	struct list_head tmp = LIST_HEAD_INIT(tmp);
	328	struct kvm_kernel_irq_routing_entry *e = NULL;
	329	unsigned i;
	330	int r;
	331
	332	for (i = 0; i < nr; ++i) {
	333	r = -EINVAL;
	334	if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
	335	goto out;
	336	if (ue->flags)
	337	goto out;
	338	r = -ENOMEM;
	339	e = kzalloc(sizeof(*e), GFP_KERNEL);
	340	if (!e)
	341	goto out;
	342	r = setup_routing_entry(e, ue);
	343	if (r)
	344	goto out;
	345	++ue;
	346	list_add(&e->link, &irq_list);
	347	e = NULL;
	348	}
	349
fa40a821	350	mutex_lock(&kvm->irq_lock);
399ec807 AK	351	list_splice(&kvm->irq_routing, &tmp);
	352	INIT_LIST_HEAD(&kvm->irq_routing);
	353	list_splice(&irq_list, &kvm->irq_routing);
	354	INIT_LIST_HEAD(&irq_list);
	355	list_splice(&tmp, &irq_list);
fa40a821	356	mutex_unlock(&kvm->irq_lock);
399ec807 AK	357
	358	r = 0;
	359
	360	out:
	361	kfree(e);
	362	__kvm_free_irq_routing(&irq_list);
	363	return r;
	364	}
	365
	366	#define IOAPIC_ROUTING_ENTRY(irq) \
	367	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
	368	.u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
	369	#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
	370
	371	#ifdef CONFIG_X86
399ec807 AK	372	# define PIC_ROUTING_ENTRY(irq) \
	373	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
	374	.u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
	375	# define ROUTING_ENTRY2(irq) \
	376	IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
	377	#else
	378	# define ROUTING_ENTRY2(irq) \
	379	IOAPIC_ROUTING_ENTRY(irq)
	380	#endif
	381
	382	static const struct kvm_irq_routing_entry default_routing[] = {
	383	ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
	384	ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
	385	ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
	386	ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
	387	ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
	388	ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
	389	ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
	390	ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
	391	ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
	392	ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
	393	ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
	394	ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
	395	#ifdef CONFIG_IA64
	396	ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
	397	ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
	398	ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
	399	ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
	400	ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
	401	ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
	402	ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
	403	ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
	404	ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
	405	ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
	406	ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
	407	ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
	408	#endif
	409	};
	410
	411	int kvm_setup_default_irq_routing(struct kvm *kvm)
	412	{
	413	return kvm_set_irq_routing(kvm, default_routing,
	414	ARRAY_SIZE(default_routing), 0);
	415	}