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