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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));
Paolo Bonzinic622a3c2016-06-01 14:09:21 +020043 if (irq_rt && gsi < irq_rt->nr_rt_entries) {
Paul Mackerras8ba918d2014-06-30 20:51:10 +100044 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
Eric Augerebe91522016-07-22 16:20:39 +000065 if (!irqchip_in_kernel(kvm) || (msi->flags & ~KVM_MSI_VALID_DEVID))
Alexander Graf1c9f8522013-04-15 23:04:10 +020066 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;
Eric Augerebe91522016-07-22 16:20:39 +000071 route.msi.flags = msi->flags;
72 route.msi.devid = msi->devid;
Alexander Graf1c9f8522013-04-15 23:04:10 +020073
74 return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, false);
75}
76
77/*
78 * Return value:
79 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
80 * = 0 Interrupt was coalesced (previous irq is still pending)
81 * > 0 Number of CPUs interrupt was delivered to
82 */
83int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
84 bool line_status)
85{
Paul Mackerras8ba918d2014-06-30 20:51:10 +100086 struct kvm_kernel_irq_routing_entry irq_set[KVM_NR_IRQCHIPS];
87 int ret = -1, i, idx;
Alexander Graf1c9f8522013-04-15 23:04:10 +020088
89 trace_kvm_set_irq(irq, level, irq_source_id);
90
91 /* Not possible to detect if the guest uses the PIC or the
92 * IOAPIC. So set the bit in both. The guest will ignore
93 * writes to the unused one.
94 */
Christian Borntraeger719d93c2014-01-16 13:44:20 +010095 idx = srcu_read_lock(&kvm->irq_srcu);
Paul Mackerras9957c862014-06-30 20:51:11 +100096 i = kvm_irq_map_gsi(kvm, irq_set, irq);
Christian Borntraeger719d93c2014-01-16 13:44:20 +010097 srcu_read_unlock(&kvm->irq_srcu, idx);
Alexander Graf1c9f8522013-04-15 23:04:10 +020098
Kevin Mulveyae548c52015-02-20 08:21:37 -050099 while (i--) {
Alexander Graf1c9f8522013-04-15 23:04:10 +0200100 int r;
101 r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level,
102 line_status);
103 if (r < 0)
104 continue;
105
106 ret = r + ((ret < 0) ? 0 : ret);
107 }
108
109 return ret;
110}
111
Joerg Roedele73f61e2015-05-08 14:31:44 +0200112static void free_irq_routing_table(struct kvm_irq_routing_table *rt)
113{
114 int i;
115
116 if (!rt)
117 return;
118
119 for (i = 0; i < rt->nr_rt_entries; ++i) {
120 struct kvm_kernel_irq_routing_entry *e;
121 struct hlist_node *n;
122
123 hlist_for_each_entry_safe(e, n, &rt->map[i], link) {
124 hlist_del(&e->link);
125 kfree(e);
126 }
127 }
128
129 kfree(rt);
130}
131
Alexander Graf1c9f8522013-04-15 23:04:10 +0200132void kvm_free_irq_routing(struct kvm *kvm)
133{
134 /* Called only during vm destruction. Nobody can use the pointer
135 at this stage */
Joerg Roedele73f61e2015-05-08 14:31:44 +0200136 struct kvm_irq_routing_table *rt = rcu_access_pointer(kvm->irq_routing);
137 free_irq_routing_table(rt);
Alexander Graf1c9f8522013-04-15 23:04:10 +0200138}
Alexander Grafe8cde092013-04-15 23:23:21 +0200139
Radim Krčmářc63cf532016-07-12 22:09:26 +0200140static int setup_routing_entry(struct kvm *kvm,
141 struct kvm_irq_routing_table *rt,
Alexander Grafe8cde092013-04-15 23:23:21 +0200142 struct kvm_kernel_irq_routing_entry *e,
143 const struct kvm_irq_routing_entry *ue)
144{
Alexander Grafe8cde092013-04-15 23:23:21 +0200145 struct kvm_kernel_irq_routing_entry *ei;
David Hildenbrand8c6b7822017-04-07 10:50:35 +0200146 int r;
Alexander Grafe8cde092013-04-15 23:23:21 +0200147
148 /*
149 * Do not allow GSI to be mapped to the same irqchip more than once.
Andrey Smetaninf33143d2015-10-16 10:07:48 +0300150 * Allow only one to one mapping between GSI and non-irqchip routing.
Alexander Grafe8cde092013-04-15 23:23:21 +0200151 */
152 hlist_for_each_entry(ei, &rt->map[ue->gsi], link)
Andrey Smetaninf33143d2015-10-16 10:07:48 +0300153 if (ei->type != KVM_IRQ_ROUTING_IRQCHIP ||
154 ue->type != KVM_IRQ_ROUTING_IRQCHIP ||
Alexander Grafe8cde092013-04-15 23:23:21 +0200155 ue->u.irqchip.irqchip == ei->irqchip.irqchip)
David Hildenbrand8c6b7822017-04-07 10:50:35 +0200156 return -EINVAL;
Alexander Grafe8cde092013-04-15 23:23:21 +0200157
158 e->gsi = ue->gsi;
159 e->type = ue->type;
Radim Krčmářc63cf532016-07-12 22:09:26 +0200160 r = kvm_set_routing_entry(kvm, e, ue);
Alexander Grafe8cde092013-04-15 23:23:21 +0200161 if (r)
David Hildenbrand8c6b7822017-04-07 10:50:35 +0200162 return r;
Paul Mackerras8ba918d2014-06-30 20:51:10 +1000163 if (e->type == KVM_IRQ_ROUTING_IRQCHIP)
164 rt->chip[e->irqchip.irqchip][e->irqchip.pin] = e->gsi;
Alexander Grafe8cde092013-04-15 23:23:21 +0200165
166 hlist_add_head(&e->link, &rt->map[e->gsi]);
David Hildenbrand8c6b7822017-04-07 10:50:35 +0200167
168 return 0;
Alexander Grafe8cde092013-04-15 23:23:21 +0200169}
170
Andrey Smetaninabdb0802015-11-10 15:36:31 +0300171void __attribute__((weak)) kvm_arch_irq_routing_update(struct kvm *kvm)
172{
173}
174
David Hildenbrand5c0aea02017-04-28 17:06:20 +0200175bool __weak kvm_arch_can_set_irq_routing(struct kvm *kvm)
176{
177 return true;
178}
179
Alexander Grafe8cde092013-04-15 23:23:21 +0200180int kvm_set_irq_routing(struct kvm *kvm,
181 const struct kvm_irq_routing_entry *ue,
182 unsigned nr,
183 unsigned flags)
184{
185 struct kvm_irq_routing_table *new, *old;
Eric Auger995a0ee2016-07-22 16:20:42 +0000186 struct kvm_kernel_irq_routing_entry *e;
Alexander Grafe8cde092013-04-15 23:23:21 +0200187 u32 i, j, nr_rt_entries = 0;
188 int r;
189
190 for (i = 0; i < nr; ++i) {
191 if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
192 return -EINVAL;
193 nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
194 }
195
196 nr_rt_entries += 1;
197
Joerg Roedele73f61e2015-05-08 14:31:44 +0200198 new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head)),
Alexander Grafe8cde092013-04-15 23:23:21 +0200199 GFP_KERNEL);
200
201 if (!new)
202 return -ENOMEM;
203
Alexander Grafe8cde092013-04-15 23:23:21 +0200204 new->nr_rt_entries = nr_rt_entries;
205 for (i = 0; i < KVM_NR_IRQCHIPS; i++)
206 for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++)
207 new->chip[i][j] = -1;
208
209 for (i = 0; i < nr; ++i) {
Joerg Roedele73f61e2015-05-08 14:31:44 +0200210 r = -ENOMEM;
211 e = kzalloc(sizeof(*e), GFP_KERNEL);
212 if (!e)
213 goto out;
214
Alexander Grafe8cde092013-04-15 23:23:21 +0200215 r = -EINVAL;
Eric Auger995a0ee2016-07-22 16:20:42 +0000216 switch (ue->type) {
217 case KVM_IRQ_ROUTING_MSI:
218 if (ue->flags & ~KVM_MSI_VALID_DEVID)
219 goto free_entry;
220 break;
221 default:
222 if (ue->flags)
223 goto free_entry;
224 break;
Sudip Mukherjeeba60c412015-09-02 12:33:53 +0530225 }
Radim Krčmářc63cf532016-07-12 22:09:26 +0200226 r = setup_routing_entry(kvm, new, e, ue);
Eric Auger995a0ee2016-07-22 16:20:42 +0000227 if (r)
228 goto free_entry;
Alexander Grafe8cde092013-04-15 23:23:21 +0200229 ++ue;
230 }
231
232 mutex_lock(&kvm->irq_lock);
Christian Borntraeger5535f802017-07-06 20:31:11 +0200233 old = rcu_dereference_protected(kvm->irq_routing, 1);
Paul Mackerras9957c862014-06-30 20:51:11 +1000234 rcu_assign_pointer(kvm->irq_routing, new);
235 kvm_irq_routing_update(kvm);
Andrey Smetaninabdb0802015-11-10 15:36:31 +0300236 kvm_arch_irq_routing_update(kvm);
Alexander Grafe8cde092013-04-15 23:23:21 +0200237 mutex_unlock(&kvm->irq_lock);
238
Andrey Smetaninabdb0802015-11-10 15:36:31 +0300239 kvm_arch_post_irq_routing_update(kvm);
Steve Rutherfordb053b2a2015-07-29 23:32:35 -0700240
Christian Borntraeger719d93c2014-01-16 13:44:20 +0100241 synchronize_srcu_expedited(&kvm->irq_srcu);
Alexander Grafe8cde092013-04-15 23:23:21 +0200242
243 new = old;
244 r = 0;
Eric Auger995a0ee2016-07-22 16:20:42 +0000245 goto out;
Alexander Grafe8cde092013-04-15 23:23:21 +0200246
Eric Auger995a0ee2016-07-22 16:20:42 +0000247free_entry:
248 kfree(e);
Alexander Grafe8cde092013-04-15 23:23:21 +0200249out:
Joerg Roedele73f61e2015-05-08 14:31:44 +0200250 free_irq_routing_table(new);
251
Alexander Grafe8cde092013-04-15 23:23:21 +0200252 return r;
253}