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Alexander Graf1c9f8522013-04-15 23:04:10 +02001/*
2 * irqchip.c: Common API for in kernel interrupt controllers
3 * Copyright (c) 2007, Intel Corporation.
4 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
5 * Copyright (c) 2013, Alexander Graf <agraf@suse.de>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
18 * Place - Suite 330, Boston, MA 02111-1307 USA.
19 *
20 * This file is derived from virt/kvm/irq_comm.c.
21 *
22 * Authors:
23 * Yaozu (Eddie) Dong <Eddie.dong@intel.com>
24 * Alexander Graf <agraf@suse.de>
25 */
26
27#include <linux/kvm_host.h>
28#include <linux/slab.h>
Christian Borntraeger719d93c2014-01-16 13:44:20 +010029#include <linux/srcu.h>
Alexander Graf1c9f8522013-04-15 23:04:10 +020030#include <linux/export.h>
31#include <trace/events/kvm.h>
32#include "irq.h"
33
Paul Mackerras9957c862014-06-30 20:51:11 +100034int kvm_irq_map_gsi(struct kvm *kvm,
35 struct kvm_kernel_irq_routing_entry *entries, int gsi)
Paul Mackerras8ba918d2014-06-30 20:51:10 +100036{
Paul Mackerras9957c862014-06-30 20:51:11 +100037 struct kvm_irq_routing_table *irq_rt;
Paul Mackerras8ba918d2014-06-30 20:51:10 +100038 struct kvm_kernel_irq_routing_entry *e;
39 int n = 0;
40
Paul Mackerras9957c862014-06-30 20:51:11 +100041 irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
42 lockdep_is_held(&kvm->irq_lock));
Paul Mackerras8ba918d2014-06-30 20:51:10 +100043 if (gsi < irq_rt->nr_rt_entries) {
44 hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
45 entries[n] = *e;
46 ++n;
47 }
48 }
49
50 return n;
51}
52
Paul Mackerras9957c862014-06-30 20:51:11 +100053int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin)
Paul Mackerras8ba918d2014-06-30 20:51:10 +100054{
Paul Mackerras9957c862014-06-30 20:51:11 +100055 struct kvm_irq_routing_table *irq_rt;
56
57 irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
Paul Mackerras8ba918d2014-06-30 20:51:10 +100058 return irq_rt->chip[irqchip][pin];
59}
60
Alexander Graf1c9f8522013-04-15 23:04:10 +020061int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
62{
63 struct kvm_kernel_irq_routing_entry route;
64
65 if (!irqchip_in_kernel(kvm) || msi->flags != 0)
66 return -EINVAL;
67
68 route.msi.address_lo = msi->address_lo;
69 route.msi.address_hi = msi->address_hi;
70 route.msi.data = msi->data;
71
72 return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, false);
73}
74
75/*
76 * Return value:
77 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
78 * = 0 Interrupt was coalesced (previous irq is still pending)
79 * > 0 Number of CPUs interrupt was delivered to
80 */
81int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
82 bool line_status)
83{
Paul Mackerras8ba918d2014-06-30 20:51:10 +100084 struct kvm_kernel_irq_routing_entry irq_set[KVM_NR_IRQCHIPS];
85 int ret = -1, i, idx;
Alexander Graf1c9f8522013-04-15 23:04:10 +020086
87 trace_kvm_set_irq(irq, level, irq_source_id);
88
89 /* Not possible to detect if the guest uses the PIC or the
90 * IOAPIC. So set the bit in both. The guest will ignore
91 * writes to the unused one.
92 */
Christian Borntraeger719d93c2014-01-16 13:44:20 +010093 idx = srcu_read_lock(&kvm->irq_srcu);
Paul Mackerras9957c862014-06-30 20:51:11 +100094 i = kvm_irq_map_gsi(kvm, irq_set, irq);
Christian Borntraeger719d93c2014-01-16 13:44:20 +010095 srcu_read_unlock(&kvm->irq_srcu, idx);
Alexander Graf1c9f8522013-04-15 23:04:10 +020096
Kevin Mulveyae548c52015-02-20 08:21:37 -050097 while (i--) {
Alexander Graf1c9f8522013-04-15 23:04:10 +020098 int r;
99 r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level,
100 line_status);
101 if (r < 0)
102 continue;
103
104 ret = r + ((ret < 0) ? 0 : ret);
105 }
106
107 return ret;
108}
109
Joerg Roedele73f61e2015-05-08 14:31:44 +0200110static void free_irq_routing_table(struct kvm_irq_routing_table *rt)
111{
112 int i;
113
114 if (!rt)
115 return;
116
117 for (i = 0; i < rt->nr_rt_entries; ++i) {
118 struct kvm_kernel_irq_routing_entry *e;
119 struct hlist_node *n;
120
121 hlist_for_each_entry_safe(e, n, &rt->map[i], link) {
122 hlist_del(&e->link);
123 kfree(e);
124 }
125 }
126
127 kfree(rt);
128}
129
Alexander Graf1c9f8522013-04-15 23:04:10 +0200130void kvm_free_irq_routing(struct kvm *kvm)
131{
132 /* Called only during vm destruction. Nobody can use the pointer
133 at this stage */
Joerg Roedele73f61e2015-05-08 14:31:44 +0200134 struct kvm_irq_routing_table *rt = rcu_access_pointer(kvm->irq_routing);
135 free_irq_routing_table(rt);
Alexander Graf1c9f8522013-04-15 23:04:10 +0200136}
Alexander Grafe8cde092013-04-15 23:23:21 +0200137
138static int setup_routing_entry(struct kvm_irq_routing_table *rt,
139 struct kvm_kernel_irq_routing_entry *e,
140 const struct kvm_irq_routing_entry *ue)
141{
142 int r = -EINVAL;
143 struct kvm_kernel_irq_routing_entry *ei;
144
145 /*
146 * Do not allow GSI to be mapped to the same irqchip more than once.
Andrey Smetaninf33143d2015-10-16 10:07:48 +0300147 * Allow only one to one mapping between GSI and non-irqchip routing.
Alexander Grafe8cde092013-04-15 23:23:21 +0200148 */
149 hlist_for_each_entry(ei, &rt->map[ue->gsi], link)
Andrey Smetaninf33143d2015-10-16 10:07:48 +0300150 if (ei->type != KVM_IRQ_ROUTING_IRQCHIP ||
151 ue->type != KVM_IRQ_ROUTING_IRQCHIP ||
Alexander Grafe8cde092013-04-15 23:23:21 +0200152 ue->u.irqchip.irqchip == ei->irqchip.irqchip)
153 return r;
154
155 e->gsi = ue->gsi;
156 e->type = ue->type;
Paul Mackerras8ba918d2014-06-30 20:51:10 +1000157 r = kvm_set_routing_entry(e, ue);
Alexander Grafe8cde092013-04-15 23:23:21 +0200158 if (r)
159 goto out;
Paul Mackerras8ba918d2014-06-30 20:51:10 +1000160 if (e->type == KVM_IRQ_ROUTING_IRQCHIP)
161 rt->chip[e->irqchip.irqchip][e->irqchip.pin] = e->gsi;
Alexander Grafe8cde092013-04-15 23:23:21 +0200162
163 hlist_add_head(&e->link, &rt->map[e->gsi]);
164 r = 0;
165out:
166 return r;
167}
168
Andrey Smetaninabdb0802015-11-10 15:36:31 +0300169void __attribute__((weak)) kvm_arch_irq_routing_update(struct kvm *kvm)
170{
171}
172
Alexander Grafe8cde092013-04-15 23:23:21 +0200173int kvm_set_irq_routing(struct kvm *kvm,
174 const struct kvm_irq_routing_entry *ue,
175 unsigned nr,
176 unsigned flags)
177{
178 struct kvm_irq_routing_table *new, *old;
179 u32 i, j, nr_rt_entries = 0;
180 int r;
181
182 for (i = 0; i < nr; ++i) {
183 if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
184 return -EINVAL;
185 nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
186 }
187
188 nr_rt_entries += 1;
189
Joerg Roedele73f61e2015-05-08 14:31:44 +0200190 new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head)),
Alexander Grafe8cde092013-04-15 23:23:21 +0200191 GFP_KERNEL);
192
193 if (!new)
194 return -ENOMEM;
195
Alexander Grafe8cde092013-04-15 23:23:21 +0200196 new->nr_rt_entries = nr_rt_entries;
197 for (i = 0; i < KVM_NR_IRQCHIPS; i++)
198 for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++)
199 new->chip[i][j] = -1;
200
201 for (i = 0; i < nr; ++i) {
Joerg Roedele73f61e2015-05-08 14:31:44 +0200202 struct kvm_kernel_irq_routing_entry *e;
203
204 r = -ENOMEM;
205 e = kzalloc(sizeof(*e), GFP_KERNEL);
206 if (!e)
207 goto out;
208
Alexander Grafe8cde092013-04-15 23:23:21 +0200209 r = -EINVAL;
Sudip Mukherjeeba60c412015-09-02 12:33:53 +0530210 if (ue->flags) {
211 kfree(e);
Alexander Grafe8cde092013-04-15 23:23:21 +0200212 goto out;
Sudip Mukherjeeba60c412015-09-02 12:33:53 +0530213 }
Joerg Roedele73f61e2015-05-08 14:31:44 +0200214 r = setup_routing_entry(new, e, ue);
Sudip Mukherjeeba60c412015-09-02 12:33:53 +0530215 if (r) {
216 kfree(e);
Alexander Grafe8cde092013-04-15 23:23:21 +0200217 goto out;
Sudip Mukherjeeba60c412015-09-02 12:33:53 +0530218 }
Alexander Grafe8cde092013-04-15 23:23:21 +0200219 ++ue;
220 }
221
222 mutex_lock(&kvm->irq_lock);
223 old = kvm->irq_routing;
Paul Mackerras9957c862014-06-30 20:51:11 +1000224 rcu_assign_pointer(kvm->irq_routing, new);
225 kvm_irq_routing_update(kvm);
Andrey Smetaninabdb0802015-11-10 15:36:31 +0300226 kvm_arch_irq_routing_update(kvm);
Alexander Grafe8cde092013-04-15 23:23:21 +0200227 mutex_unlock(&kvm->irq_lock);
228
Andrey Smetaninabdb0802015-11-10 15:36:31 +0300229 kvm_arch_post_irq_routing_update(kvm);
Steve Rutherfordb053b2a2015-07-29 23:32:35 -0700230
Christian Borntraeger719d93c2014-01-16 13:44:20 +0100231 synchronize_srcu_expedited(&kvm->irq_srcu);
Alexander Grafe8cde092013-04-15 23:23:21 +0200232
233 new = old;
234 r = 0;
235
236out:
Joerg Roedele73f61e2015-05-08 14:31:44 +0200237 free_irq_routing_table(new);
238
Alexander Grafe8cde092013-04-15 23:23:21 +0200239 return r;
240}