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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> | |
29 | #include <linux/export.h> | |
30 | #include <trace/events/kvm.h> | |
31 | #include "irq.h" | |
32 | ||
33 | bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin) | |
34 | { | |
35 | struct kvm_irq_ack_notifier *kian; | |
36 | int gsi; | |
37 | ||
38 | rcu_read_lock(); | |
39 | gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin]; | |
40 | if (gsi != -1) | |
41 | hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list, | |
42 | link) | |
43 | if (kian->gsi == gsi) { | |
44 | rcu_read_unlock(); | |
45 | return true; | |
46 | } | |
47 | ||
48 | rcu_read_unlock(); | |
49 | ||
50 | return false; | |
51 | } | |
52 | EXPORT_SYMBOL_GPL(kvm_irq_has_notifier); | |
53 | ||
54 | void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) | |
55 | { | |
56 | struct kvm_irq_ack_notifier *kian; | |
57 | int gsi; | |
58 | ||
59 | trace_kvm_ack_irq(irqchip, pin); | |
60 | ||
61 | rcu_read_lock(); | |
62 | gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin]; | |
63 | if (gsi != -1) | |
64 | hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list, | |
65 | link) | |
66 | if (kian->gsi == gsi) | |
67 | kian->irq_acked(kian); | |
68 | rcu_read_unlock(); | |
69 | } | |
70 | ||
71 | void kvm_register_irq_ack_notifier(struct kvm *kvm, | |
72 | struct kvm_irq_ack_notifier *kian) | |
73 | { | |
74 | mutex_lock(&kvm->irq_lock); | |
75 | hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list); | |
76 | mutex_unlock(&kvm->irq_lock); | |
77 | #ifdef __KVM_HAVE_IOAPIC | |
78 | kvm_vcpu_request_scan_ioapic(kvm); | |
79 | #endif | |
80 | } | |
81 | ||
82 | void kvm_unregister_irq_ack_notifier(struct kvm *kvm, | |
83 | struct kvm_irq_ack_notifier *kian) | |
84 | { | |
85 | mutex_lock(&kvm->irq_lock); | |
86 | hlist_del_init_rcu(&kian->link); | |
87 | mutex_unlock(&kvm->irq_lock); | |
88 | synchronize_rcu(); | |
89 | #ifdef __KVM_HAVE_IOAPIC | |
90 | kvm_vcpu_request_scan_ioapic(kvm); | |
91 | #endif | |
92 | } | |
93 | ||
94 | int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi) | |
95 | { | |
96 | struct kvm_kernel_irq_routing_entry route; | |
97 | ||
98 | if (!irqchip_in_kernel(kvm) || msi->flags != 0) | |
99 | return -EINVAL; | |
100 | ||
101 | route.msi.address_lo = msi->address_lo; | |
102 | route.msi.address_hi = msi->address_hi; | |
103 | route.msi.data = msi->data; | |
104 | ||
105 | return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, false); | |
106 | } | |
107 | ||
108 | /* | |
109 | * Return value: | |
110 | * < 0 Interrupt was ignored (masked or not delivered for other reasons) | |
111 | * = 0 Interrupt was coalesced (previous irq is still pending) | |
112 | * > 0 Number of CPUs interrupt was delivered to | |
113 | */ | |
114 | int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, | |
115 | bool line_status) | |
116 | { | |
117 | struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS]; | |
118 | int ret = -1, i = 0; | |
119 | struct kvm_irq_routing_table *irq_rt; | |
120 | ||
121 | trace_kvm_set_irq(irq, level, irq_source_id); | |
122 | ||
123 | /* Not possible to detect if the guest uses the PIC or the | |
124 | * IOAPIC. So set the bit in both. The guest will ignore | |
125 | * writes to the unused one. | |
126 | */ | |
127 | rcu_read_lock(); | |
128 | irq_rt = rcu_dereference(kvm->irq_routing); | |
129 | if (irq < irq_rt->nr_rt_entries) | |
130 | hlist_for_each_entry(e, &irq_rt->map[irq], link) | |
131 | irq_set[i++] = *e; | |
132 | rcu_read_unlock(); | |
133 | ||
134 | while(i--) { | |
135 | int r; | |
136 | r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level, | |
137 | line_status); | |
138 | if (r < 0) | |
139 | continue; | |
140 | ||
141 | ret = r + ((ret < 0) ? 0 : ret); | |
142 | } | |
143 | ||
144 | return ret; | |
145 | } | |
146 | ||
147 | void kvm_free_irq_routing(struct kvm *kvm) | |
148 | { | |
149 | /* Called only during vm destruction. Nobody can use the pointer | |
150 | at this stage */ | |
151 | kfree(kvm->irq_routing); | |
152 | } | |
e8cde093 AG |
153 | |
154 | static int setup_routing_entry(struct kvm_irq_routing_table *rt, | |
155 | struct kvm_kernel_irq_routing_entry *e, | |
156 | const struct kvm_irq_routing_entry *ue) | |
157 | { | |
158 | int r = -EINVAL; | |
159 | struct kvm_kernel_irq_routing_entry *ei; | |
160 | ||
161 | /* | |
162 | * Do not allow GSI to be mapped to the same irqchip more than once. | |
163 | * Allow only one to one mapping between GSI and MSI. | |
164 | */ | |
165 | hlist_for_each_entry(ei, &rt->map[ue->gsi], link) | |
166 | if (ei->type == KVM_IRQ_ROUTING_MSI || | |
167 | ue->type == KVM_IRQ_ROUTING_MSI || | |
168 | ue->u.irqchip.irqchip == ei->irqchip.irqchip) | |
169 | return r; | |
170 | ||
171 | e->gsi = ue->gsi; | |
172 | e->type = ue->type; | |
173 | r = kvm_set_routing_entry(rt, e, ue); | |
174 | if (r) | |
175 | goto out; | |
176 | ||
177 | hlist_add_head(&e->link, &rt->map[e->gsi]); | |
178 | r = 0; | |
179 | out: | |
180 | return r; | |
181 | } | |
182 | ||
183 | int kvm_set_irq_routing(struct kvm *kvm, | |
184 | const struct kvm_irq_routing_entry *ue, | |
185 | unsigned nr, | |
186 | unsigned flags) | |
187 | { | |
188 | struct kvm_irq_routing_table *new, *old; | |
189 | u32 i, j, nr_rt_entries = 0; | |
190 | int r; | |
191 | ||
192 | for (i = 0; i < nr; ++i) { | |
193 | if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES) | |
194 | return -EINVAL; | |
195 | nr_rt_entries = max(nr_rt_entries, ue[i].gsi); | |
196 | } | |
197 | ||
198 | nr_rt_entries += 1; | |
199 | ||
200 | new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head)) | |
201 | + (nr * sizeof(struct kvm_kernel_irq_routing_entry)), | |
202 | GFP_KERNEL); | |
203 | ||
204 | if (!new) | |
205 | return -ENOMEM; | |
206 | ||
207 | new->rt_entries = (void *)&new->map[nr_rt_entries]; | |
208 | ||
209 | new->nr_rt_entries = nr_rt_entries; | |
210 | for (i = 0; i < KVM_NR_IRQCHIPS; i++) | |
211 | for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++) | |
212 | new->chip[i][j] = -1; | |
213 | ||
214 | for (i = 0; i < nr; ++i) { | |
215 | r = -EINVAL; | |
216 | if (ue->flags) | |
217 | goto out; | |
218 | r = setup_routing_entry(new, &new->rt_entries[i], ue); | |
219 | if (r) | |
220 | goto out; | |
221 | ++ue; | |
222 | } | |
223 | ||
224 | mutex_lock(&kvm->irq_lock); | |
225 | old = kvm->irq_routing; | |
226 | kvm_irq_routing_update(kvm, new); | |
227 | mutex_unlock(&kvm->irq_lock); | |
228 | ||
229 | synchronize_rcu(); | |
230 | ||
231 | new = old; | |
232 | r = 0; | |
233 | ||
234 | out: | |
235 | kfree(new); | |
236 | return r; | |
237 | } |