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1c9f8520 AG |
1 | /* |
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> | |
719d93cd | 29 | #include <linux/srcu.h> |
1c9f8520 AG |
30 | #include <linux/export.h> |
31 | #include <trace/events/kvm.h> | |
32 | #include "irq.h" | |
33 | ||
9957c86d PM |
34 | int kvm_irq_map_gsi(struct kvm *kvm, |
35 | struct kvm_kernel_irq_routing_entry *entries, int gsi) | |
8ba918d4 | 36 | { |
9957c86d | 37 | struct kvm_irq_routing_table *irq_rt; |
8ba918d4 PM |
38 | struct kvm_kernel_irq_routing_entry *e; |
39 | int n = 0; | |
40 | ||
9957c86d PM |
41 | irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu, |
42 | lockdep_is_held(&kvm->irq_lock)); | |
c622a3c2 | 43 | if (irq_rt && gsi < irq_rt->nr_rt_entries) { |
8ba918d4 PM |
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 | ||
9957c86d | 53 | int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin) |
8ba918d4 | 54 | { |
9957c86d PM |
55 | struct kvm_irq_routing_table *irq_rt; |
56 | ||
57 | irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); | |
8ba918d4 PM |
58 | return irq_rt->chip[irqchip][pin]; |
59 | } | |
60 | ||
1c9f8520 AG |
61 | int 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 | */ | |
81 | int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, | |
82 | bool line_status) | |
83 | { | |
8ba918d4 PM |
84 | struct kvm_kernel_irq_routing_entry irq_set[KVM_NR_IRQCHIPS]; |
85 | int ret = -1, i, idx; | |
1c9f8520 AG |
86 | |
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 | */ | |
719d93cd | 93 | idx = srcu_read_lock(&kvm->irq_srcu); |
9957c86d | 94 | i = kvm_irq_map_gsi(kvm, irq_set, irq); |
719d93cd | 95 | srcu_read_unlock(&kvm->irq_srcu, idx); |
1c9f8520 | 96 | |
ae548c5c | 97 | while (i--) { |
1c9f8520 AG |
98 | 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 | ||
e73f61e4 JR |
110 | static 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 | ||
1c9f8520 AG |
130 | void kvm_free_irq_routing(struct kvm *kvm) |
131 | { | |
132 | /* Called only during vm destruction. Nobody can use the pointer | |
133 | at this stage */ | |
e73f61e4 JR |
134 | struct kvm_irq_routing_table *rt = rcu_access_pointer(kvm->irq_routing); |
135 | free_irq_routing_table(rt); | |
1c9f8520 | 136 | } |
e8cde093 | 137 | |
c63cf538 RK |
138 | static int setup_routing_entry(struct kvm *kvm, |
139 | struct kvm_irq_routing_table *rt, | |
e8cde093 AG |
140 | struct kvm_kernel_irq_routing_entry *e, |
141 | const struct kvm_irq_routing_entry *ue) | |
142 | { | |
143 | int r = -EINVAL; | |
144 | struct kvm_kernel_irq_routing_entry *ei; | |
145 | ||
146 | /* | |
147 | * Do not allow GSI to be mapped to the same irqchip more than once. | |
f33143d8 | 148 | * Allow only one to one mapping between GSI and non-irqchip routing. |
e8cde093 AG |
149 | */ |
150 | hlist_for_each_entry(ei, &rt->map[ue->gsi], link) | |
f33143d8 AS |
151 | if (ei->type != KVM_IRQ_ROUTING_IRQCHIP || |
152 | ue->type != KVM_IRQ_ROUTING_IRQCHIP || | |
e8cde093 AG |
153 | ue->u.irqchip.irqchip == ei->irqchip.irqchip) |
154 | return r; | |
155 | ||
156 | e->gsi = ue->gsi; | |
157 | e->type = ue->type; | |
c63cf538 | 158 | r = kvm_set_routing_entry(kvm, e, ue); |
e8cde093 AG |
159 | if (r) |
160 | goto out; | |
8ba918d4 PM |
161 | if (e->type == KVM_IRQ_ROUTING_IRQCHIP) |
162 | rt->chip[e->irqchip.irqchip][e->irqchip.pin] = e->gsi; | |
e8cde093 AG |
163 | |
164 | hlist_add_head(&e->link, &rt->map[e->gsi]); | |
165 | r = 0; | |
166 | out: | |
167 | return r; | |
168 | } | |
169 | ||
abdb080f AS |
170 | void __attribute__((weak)) kvm_arch_irq_routing_update(struct kvm *kvm) |
171 | { | |
172 | } | |
173 | ||
e8cde093 AG |
174 | int kvm_set_irq_routing(struct kvm *kvm, |
175 | const struct kvm_irq_routing_entry *ue, | |
176 | unsigned nr, | |
177 | unsigned flags) | |
178 | { | |
179 | struct kvm_irq_routing_table *new, *old; | |
180 | u32 i, j, nr_rt_entries = 0; | |
181 | int r; | |
182 | ||
183 | for (i = 0; i < nr; ++i) { | |
184 | if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES) | |
185 | return -EINVAL; | |
186 | nr_rt_entries = max(nr_rt_entries, ue[i].gsi); | |
187 | } | |
188 | ||
189 | nr_rt_entries += 1; | |
190 | ||
e73f61e4 | 191 | new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head)), |
e8cde093 AG |
192 | GFP_KERNEL); |
193 | ||
194 | if (!new) | |
195 | return -ENOMEM; | |
196 | ||
e8cde093 AG |
197 | new->nr_rt_entries = nr_rt_entries; |
198 | for (i = 0; i < KVM_NR_IRQCHIPS; i++) | |
199 | for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++) | |
200 | new->chip[i][j] = -1; | |
201 | ||
202 | for (i = 0; i < nr; ++i) { | |
e73f61e4 JR |
203 | struct kvm_kernel_irq_routing_entry *e; |
204 | ||
205 | r = -ENOMEM; | |
206 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
207 | if (!e) | |
208 | goto out; | |
209 | ||
e8cde093 | 210 | r = -EINVAL; |
ba60c41a SM |
211 | if (ue->flags) { |
212 | kfree(e); | |
e8cde093 | 213 | goto out; |
ba60c41a | 214 | } |
c63cf538 | 215 | r = setup_routing_entry(kvm, new, e, ue); |
ba60c41a SM |
216 | if (r) { |
217 | kfree(e); | |
e8cde093 | 218 | goto out; |
ba60c41a | 219 | } |
e8cde093 AG |
220 | ++ue; |
221 | } | |
222 | ||
223 | mutex_lock(&kvm->irq_lock); | |
224 | old = kvm->irq_routing; | |
9957c86d PM |
225 | rcu_assign_pointer(kvm->irq_routing, new); |
226 | kvm_irq_routing_update(kvm); | |
abdb080f | 227 | kvm_arch_irq_routing_update(kvm); |
e8cde093 AG |
228 | mutex_unlock(&kvm->irq_lock); |
229 | ||
abdb080f | 230 | kvm_arch_post_irq_routing_update(kvm); |
b053b2ae | 231 | |
719d93cd | 232 | synchronize_srcu_expedited(&kvm->irq_srcu); |
e8cde093 AG |
233 | |
234 | new = old; | |
235 | r = 0; | |
236 | ||
237 | out: | |
e73f61e4 JR |
238 | free_irq_routing_table(new); |
239 | ||
e8cde093 AG |
240 | return r; |
241 | } |