[deliverable/linux.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 "irq.h"

#include "ioapic.h"

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

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

/* This should be called with the kvm->lock mutex held */
void 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 = (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);

	/* 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)
			e->set(e, kvm, !!(*irq_state));
}

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->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)
{
	hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
}

void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
{
	hlist_del_init(&kian->link);
}

/* The caller must hold kvm->lock mutex */
int kvm_request_irq_source_id(struct kvm *kvm)
{
	unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
	int 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);

	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);

	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);
}

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

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

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

	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)
{
	__kvm_free_irq_routing(&kvm->irq_routing);
}

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;
	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;
	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->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->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>
	23	#include "irq.h"
	24
	25	#include "ioapic.h"
	26
399ec807 AK	27	static void kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
	28	struct kvm *kvm, int level)
	29	{
	30	#ifdef CONFIG_X86
	31	kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
	32	#endif
	33	}
	34
	35	static void kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
	36	struct kvm *kvm, int level)
	37	{
	38	kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
	39	}
	40
3de42dc0	41	/* This should be called with the kvm->lock mutex held */
5550af4d	42	void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
3de42dc0	43	{
399ec807	44	struct kvm_kernel_irq_routing_entry *e;
5550af4d SY	45	unsigned long irq_state = (unsigned long )&kvm->arch.irq_states[irq];
	46
	47	/* Logical OR for level trig interrupt */
	48	if (level)
	49	set_bit(irq_source_id, irq_state);
	50	else
	51	clear_bit(irq_source_id, irq_state);
	52
3de42dc0 XZ	53	/* Not possible to detect if the guest uses the PIC or the
	54	* IOAPIC. So set the bit in both. The guest will ignore
	55	* writes to the unused one.
	56	*/
399ec807 AK	57	list_for_each_entry(e, &kvm->irq_routing, link)
	58	if (e->gsi == irq)
	59	e->set(e, kvm, !!(*irq_state));
3de42dc0 XZ	60	}
3de42dc0 XZ	61
44882eed	62	void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
3de42dc0	63	{
44882eed	64	struct kvm_kernel_irq_routing_entry *e;
3de42dc0 XZ	65	struct kvm_irq_ack_notifier *kian;
3de42dc0 XZ	66	struct hlist_node *n;
44882eed MT	67	unsigned gsi = pin;
	68
	69	list_for_each_entry(e, &kvm->irq_routing, link)
	70	if (e->irqchip.irqchip == irqchip &&
	71	e->irqchip.pin == pin) {
	72	gsi = e->gsi;
	73	break;
	74	}
3de42dc0 XZ	75
	76	hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
	77	if (kian->gsi == gsi)
	78	kian->irq_acked(kian);
	79	}
	80
	81	void kvm_register_irq_ack_notifier(struct kvm *kvm,
	82	struct kvm_irq_ack_notifier *kian)
	83	{
	84	hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
	85	}
	86
e19e30ef	87	void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
3de42dc0	88	{
fdd897e6	89	hlist_del_init(&kian->link);
3de42dc0	90	}
5550af4d SY	91
	92	/* The caller must hold kvm->lock mutex */
	93	int kvm_request_irq_source_id(struct kvm *kvm)
	94	{
	95	unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
	96	int irq_source_id = find_first_zero_bit(bitmap,
	97	sizeof(kvm->arch.irq_sources_bitmap));
61552367	98
5550af4d SY	99	if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
5550af4d SY	100	printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
61552367 MM	101	return -EFAULT;
	102	}
	103
	104	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
	105	set_bit(irq_source_id, bitmap);
	106
5550af4d SY	107	return irq_source_id;
	108	}
	109
	110	void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
	111	{
	112	int i;
	113
61552367 MM	114	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
	115
	116	if (irq_source_id < 0 \|\|
5550af4d SY	117	irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
	118	printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
	119	return;
	120	}
	121	for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
	122	clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
	123	clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
	124	}
75858a84 AK	125
	126	void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
	127	struct kvm_irq_mask_notifier *kimn)
	128	{
	129	kimn->irq = irq;
	130	hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
	131	}
	132
	133	void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
	134	struct kvm_irq_mask_notifier *kimn)
	135	{
	136	hlist_del(&kimn->link);
	137	}
	138
	139	void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
	140	{
	141	struct kvm_irq_mask_notifier *kimn;
	142	struct hlist_node *n;
	143
	144	hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
	145	if (kimn->irq == irq)
	146	kimn->func(kimn, mask);
	147	}
	148
399ec807 AK	149	static void __kvm_free_irq_routing(struct list_head *irq_routing)
	150	{
	151	struct kvm_kernel_irq_routing_entry e, n;
	152
	153	list_for_each_entry_safe(e, n, irq_routing, link)
	154	kfree(e);
	155	}
	156
	157	void kvm_free_irq_routing(struct kvm *kvm)
	158	{
	159	__kvm_free_irq_routing(&kvm->irq_routing);
	160	}
	161
	162	int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
	163	const struct kvm_irq_routing_entry *ue)
	164	{
	165	int r = -EINVAL;
	166	int delta;
	167
	168	e->gsi = ue->gsi;
	169	switch (ue->type) {
	170	case KVM_IRQ_ROUTING_IRQCHIP:
	171	delta = 0;
	172	switch (ue->u.irqchip.irqchip) {
	173	case KVM_IRQCHIP_PIC_MASTER:
	174	e->set = kvm_set_pic_irq;
	175	break;
	176	case KVM_IRQCHIP_PIC_SLAVE:
	177	e->set = kvm_set_pic_irq;
	178	delta = 8;
	179	break;
	180	case KVM_IRQCHIP_IOAPIC:
	181	e->set = kvm_set_ioapic_irq;
	182	break;
	183	default:
	184	goto out;
	185	}
	186	e->irqchip.irqchip = ue->u.irqchip.irqchip;
	187	e->irqchip.pin = ue->u.irqchip.pin + delta;
	188	break;
	189	default:
	190	goto out;
	191	}
	192	r = 0;
	193	out:
	194	return r;
	195	}
	196
	197
	198	int kvm_set_irq_routing(struct kvm *kvm,
	199	const struct kvm_irq_routing_entry *ue,
	200	unsigned nr,
	201	unsigned flags)
	202	{
	203	struct list_head irq_list = LIST_HEAD_INIT(irq_list);
	204	struct list_head tmp = LIST_HEAD_INIT(tmp);
	205	struct kvm_kernel_irq_routing_entry *e = NULL;
	206	unsigned i;
	207	int r;
	208
	209	for (i = 0; i < nr; ++i) {
	210	r = -EINVAL;
	211	if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
	212	goto out;
213	if (ue->flags)
214	goto out;
215	r = -ENOMEM;
216	e = kzalloc(sizeof(*e), GFP_KERNEL);
217	if (!e)
218	goto out;
219	r = setup_routing_entry(e, ue);
220	if (r)
221	goto out;
222	++ue;
223	list_add(&e->link, &irq_list);
224	e = NULL;
225	}
226
227	mutex_lock(&kvm->lock);
228	list_splice(&kvm->irq_routing, &tmp);
229	INIT_LIST_HEAD(&kvm->irq_routing);
230	list_splice(&irq_list, &kvm->irq_routing);
231	INIT_LIST_HEAD(&irq_list);
232	list_splice(&tmp, &irq_list);
233	mutex_unlock(&kvm->lock);
234
235	r = 0;
236
237	out:
238	kfree(e);
239	__kvm_free_irq_routing(&irq_list);
240	return r;
241	}
242
243	#define IOAPIC_ROUTING_ENTRY(irq) \
244	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
245	.u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
246	#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
247
248	#ifdef CONFIG_X86
399ec807 AK	249	# define PIC_ROUTING_ENTRY(irq) \
	250	{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
	251	.u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
	252	# define ROUTING_ENTRY2(irq) \
	253	IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
	254	#else
	255	# define ROUTING_ENTRY2(irq) \
	256	IOAPIC_ROUTING_ENTRY(irq)
	257	#endif
	258
	259	static const struct kvm_irq_routing_entry default_routing[] = {
	260	ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
	261	ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
	262	ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
	263	ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
	264	ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
	265	ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
	266	ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
	267	ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
	268	ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
	269	ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
	270	ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
	271	ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
	272	#ifdef CONFIG_IA64
	273	ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
	274	ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
	275	ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
	276	ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
	277	ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
	278	ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
	279	ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
	280	ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
	281	ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
	282	ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
	283	ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
	284	ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
	285	#endif
	286	};
	287
	288	int kvm_setup_default_irq_routing(struct kvm *kvm)
	289	{
	290	return kvm_set_irq_routing(kvm, default_routing,
	291	ARRAY_SIZE(default_routing), 0);
	292	}