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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 | struct kvm_irq_routing_table { |
35 | int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS]; | |
9957c86d PM |
36 | u32 nr_rt_entries; |
37 | /* | |
38 | * Array indexed by gsi. Each entry contains list of irq chips | |
39 | * the gsi is connected to. | |
40 | */ | |
41 | struct hlist_head map[0]; | |
42 | }; | |
43 | ||
44 | int kvm_irq_map_gsi(struct kvm *kvm, | |
45 | struct kvm_kernel_irq_routing_entry *entries, int gsi) | |
8ba918d4 | 46 | { |
9957c86d | 47 | struct kvm_irq_routing_table *irq_rt; |
8ba918d4 PM |
48 | struct kvm_kernel_irq_routing_entry *e; |
49 | int n = 0; | |
50 | ||
9957c86d PM |
51 | irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu, |
52 | lockdep_is_held(&kvm->irq_lock)); | |
8ba918d4 PM |
53 | if (gsi < irq_rt->nr_rt_entries) { |
54 | hlist_for_each_entry(e, &irq_rt->map[gsi], link) { | |
55 | entries[n] = *e; | |
56 | ++n; | |
57 | } | |
58 | } | |
59 | ||
60 | return n; | |
61 | } | |
62 | ||
9957c86d | 63 | int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin) |
8ba918d4 | 64 | { |
9957c86d PM |
65 | struct kvm_irq_routing_table *irq_rt; |
66 | ||
67 | irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); | |
8ba918d4 PM |
68 | return irq_rt->chip[irqchip][pin]; |
69 | } | |
70 | ||
1c9f8520 AG |
71 | int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi) |
72 | { | |
73 | struct kvm_kernel_irq_routing_entry route; | |
74 | ||
75 | if (!irqchip_in_kernel(kvm) || msi->flags != 0) | |
76 | return -EINVAL; | |
77 | ||
78 | route.msi.address_lo = msi->address_lo; | |
79 | route.msi.address_hi = msi->address_hi; | |
80 | route.msi.data = msi->data; | |
81 | ||
82 | return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, false); | |
83 | } | |
84 | ||
85 | /* | |
86 | * Return value: | |
87 | * < 0 Interrupt was ignored (masked or not delivered for other reasons) | |
88 | * = 0 Interrupt was coalesced (previous irq is still pending) | |
89 | * > 0 Number of CPUs interrupt was delivered to | |
90 | */ | |
91 | int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, | |
92 | bool line_status) | |
93 | { | |
8ba918d4 PM |
94 | struct kvm_kernel_irq_routing_entry irq_set[KVM_NR_IRQCHIPS]; |
95 | int ret = -1, i, idx; | |
1c9f8520 AG |
96 | |
97 | trace_kvm_set_irq(irq, level, irq_source_id); | |
98 | ||
99 | /* Not possible to detect if the guest uses the PIC or the | |
100 | * IOAPIC. So set the bit in both. The guest will ignore | |
101 | * writes to the unused one. | |
102 | */ | |
719d93cd | 103 | idx = srcu_read_lock(&kvm->irq_srcu); |
9957c86d | 104 | i = kvm_irq_map_gsi(kvm, irq_set, irq); |
719d93cd | 105 | srcu_read_unlock(&kvm->irq_srcu, idx); |
1c9f8520 | 106 | |
ae548c5c | 107 | while (i--) { |
1c9f8520 AG |
108 | int r; |
109 | r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level, | |
110 | line_status); | |
111 | if (r < 0) | |
112 | continue; | |
113 | ||
114 | ret = r + ((ret < 0) ? 0 : ret); | |
115 | } | |
116 | ||
117 | return ret; | |
118 | } | |
119 | ||
e73f61e4 JR |
120 | static void free_irq_routing_table(struct kvm_irq_routing_table *rt) |
121 | { | |
122 | int i; | |
123 | ||
124 | if (!rt) | |
125 | return; | |
126 | ||
127 | for (i = 0; i < rt->nr_rt_entries; ++i) { | |
128 | struct kvm_kernel_irq_routing_entry *e; | |
129 | struct hlist_node *n; | |
130 | ||
131 | hlist_for_each_entry_safe(e, n, &rt->map[i], link) { | |
132 | hlist_del(&e->link); | |
133 | kfree(e); | |
134 | } | |
135 | } | |
136 | ||
137 | kfree(rt); | |
138 | } | |
139 | ||
1c9f8520 AG |
140 | void kvm_free_irq_routing(struct kvm *kvm) |
141 | { | |
142 | /* Called only during vm destruction. Nobody can use the pointer | |
143 | at this stage */ | |
e73f61e4 JR |
144 | struct kvm_irq_routing_table *rt = rcu_access_pointer(kvm->irq_routing); |
145 | free_irq_routing_table(rt); | |
1c9f8520 | 146 | } |
e8cde093 AG |
147 | |
148 | static int setup_routing_entry(struct kvm_irq_routing_table *rt, | |
149 | struct kvm_kernel_irq_routing_entry *e, | |
150 | const struct kvm_irq_routing_entry *ue) | |
151 | { | |
152 | int r = -EINVAL; | |
153 | struct kvm_kernel_irq_routing_entry *ei; | |
154 | ||
155 | /* | |
156 | * Do not allow GSI to be mapped to the same irqchip more than once. | |
157 | * Allow only one to one mapping between GSI and MSI. | |
158 | */ | |
159 | hlist_for_each_entry(ei, &rt->map[ue->gsi], link) | |
160 | if (ei->type == KVM_IRQ_ROUTING_MSI || | |
161 | ue->type == KVM_IRQ_ROUTING_MSI || | |
162 | ue->u.irqchip.irqchip == ei->irqchip.irqchip) | |
163 | return r; | |
164 | ||
165 | e->gsi = ue->gsi; | |
166 | e->type = ue->type; | |
8ba918d4 | 167 | r = kvm_set_routing_entry(e, ue); |
e8cde093 AG |
168 | if (r) |
169 | goto out; | |
8ba918d4 PM |
170 | if (e->type == KVM_IRQ_ROUTING_IRQCHIP) |
171 | rt->chip[e->irqchip.irqchip][e->irqchip.pin] = e->gsi; | |
e8cde093 AG |
172 | |
173 | hlist_add_head(&e->link, &rt->map[e->gsi]); | |
174 | r = 0; | |
175 | out: | |
176 | return r; | |
177 | } | |
178 | ||
179 | int kvm_set_irq_routing(struct kvm *kvm, | |
180 | const struct kvm_irq_routing_entry *ue, | |
181 | unsigned nr, | |
182 | unsigned flags) | |
183 | { | |
184 | struct kvm_irq_routing_table *new, *old; | |
185 | u32 i, j, nr_rt_entries = 0; | |
186 | int r; | |
187 | ||
188 | for (i = 0; i < nr; ++i) { | |
189 | if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES) | |
190 | return -EINVAL; | |
191 | nr_rt_entries = max(nr_rt_entries, ue[i].gsi); | |
192 | } | |
193 | ||
194 | nr_rt_entries += 1; | |
195 | ||
e73f61e4 | 196 | new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head)), |
e8cde093 AG |
197 | GFP_KERNEL); |
198 | ||
199 | if (!new) | |
200 | return -ENOMEM; | |
201 | ||
e8cde093 AG |
202 | new->nr_rt_entries = nr_rt_entries; |
203 | for (i = 0; i < KVM_NR_IRQCHIPS; i++) | |
204 | for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++) | |
205 | new->chip[i][j] = -1; | |
206 | ||
207 | for (i = 0; i < nr; ++i) { | |
e73f61e4 JR |
208 | struct kvm_kernel_irq_routing_entry *e; |
209 | ||
210 | r = -ENOMEM; | |
211 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
212 | if (!e) | |
213 | goto out; | |
214 | ||
e8cde093 | 215 | r = -EINVAL; |
ba60c41a SM |
216 | if (ue->flags) { |
217 | kfree(e); | |
e8cde093 | 218 | goto out; |
ba60c41a | 219 | } |
e73f61e4 | 220 | r = setup_routing_entry(new, e, ue); |
ba60c41a SM |
221 | if (r) { |
222 | kfree(e); | |
e8cde093 | 223 | goto out; |
ba60c41a | 224 | } |
e8cde093 AG |
225 | ++ue; |
226 | } | |
227 | ||
228 | mutex_lock(&kvm->irq_lock); | |
229 | old = kvm->irq_routing; | |
9957c86d PM |
230 | rcu_assign_pointer(kvm->irq_routing, new); |
231 | kvm_irq_routing_update(kvm); | |
e8cde093 AG |
232 | mutex_unlock(&kvm->irq_lock); |
233 | ||
719d93cd | 234 | synchronize_srcu_expedited(&kvm->irq_srcu); |
e8cde093 AG |
235 | |
236 | new = old; | |
237 | r = 0; | |
238 | ||
239 | out: | |
e73f61e4 JR |
240 | free_irq_routing_table(new); |
241 | ||
e8cde093 AG |
242 | return r; |
243 | } |