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authorAlexander Graf <agraf@suse.de>2013-04-15 17:04:10 -0400
committerAlexander Graf <agraf@suse.de>2013-04-26 14:27:17 -0400
commit1c9f8520bda73c07fed9bcdb307854b45a3a60c4 (patch)
treec9cdfb21218b33982781d0dadb2e4455a14c0ca4 /virt/kvm/irqchip.c
parentaa8d5944b8b2809e574581abbf41894089b7def2 (diff)
KVM: Extract generic irqchip logic into irqchip.c
The current irq_comm.c file contains pieces of code that are generic across different irqchip implementations, as well as code that is fully IOAPIC specific. Split the generic bits out into irqchip.c. Signed-off-by: Alexander Graf <agraf@suse.de> Acked-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'virt/kvm/irqchip.c')
-rw-r--r--virt/kvm/irqchip.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c
new file mode 100644
index 000000000000..12f7f26af4f8
--- /dev/null
+++ b/virt/kvm/irqchip.c
@@ -0,0 +1,152 @@
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
33bool 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}
52EXPORT_SYMBOL_GPL(kvm_irq_has_notifier);
53
54void 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
71void 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
82void 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
94int 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 */
114int 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
147void 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}