root / hw / intc / arm_gic_kvm.c @ 2c9b15ca
History | View | Annotate | Download (5.4 kB)
1 |
/*
|
---|---|
2 |
* ARM Generic Interrupt Controller using KVM in-kernel support
|
3 |
*
|
4 |
* Copyright (c) 2012 Linaro Limited
|
5 |
* Written by Peter Maydell
|
6 |
*
|
7 |
* This program is free software; you can redistribute it and/or modify
|
8 |
* it under the terms of the GNU General Public License as published by
|
9 |
* the Free Software Foundation, either version 2 of the License, or
|
10 |
* (at your option) any later version.
|
11 |
*
|
12 |
* This program is distributed in the hope that it will be useful,
|
13 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
14 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
15 |
* GNU General Public License for more details.
|
16 |
*
|
17 |
* You should have received a copy of the GNU General Public License along
|
18 |
* with this program; if not, see <http://www.gnu.org/licenses/>.
|
19 |
*/
|
20 |
|
21 |
#include "hw/sysbus.h" |
22 |
#include "sysemu/kvm.h" |
23 |
#include "kvm_arm.h" |
24 |
#include "gic_internal.h" |
25 |
|
26 |
#define TYPE_KVM_ARM_GIC "kvm-arm-gic" |
27 |
#define KVM_ARM_GIC(obj) \
|
28 |
OBJECT_CHECK(GICState, (obj), TYPE_KVM_ARM_GIC) |
29 |
#define KVM_ARM_GIC_CLASS(klass) \
|
30 |
OBJECT_CLASS_CHECK(KVMARMGICClass, (klass), TYPE_KVM_ARM_GIC) |
31 |
#define KVM_ARM_GIC_GET_CLASS(obj) \
|
32 |
OBJECT_GET_CLASS(KVMARMGICClass, (obj), TYPE_KVM_ARM_GIC) |
33 |
|
34 |
typedef struct KVMARMGICClass { |
35 |
ARMGICCommonClass parent_class; |
36 |
DeviceRealize parent_realize; |
37 |
void (*parent_reset)(DeviceState *dev);
|
38 |
} KVMARMGICClass; |
39 |
|
40 |
static void kvm_arm_gic_set_irq(void *opaque, int irq, int level) |
41 |
{ |
42 |
/* Meaning of the 'irq' parameter:
|
43 |
* [0..N-1] : external interrupts
|
44 |
* [N..N+31] : PPI (internal) interrupts for CPU 0
|
45 |
* [N+32..N+63] : PPI (internal interrupts for CPU 1
|
46 |
* ...
|
47 |
* Convert this to the kernel's desired encoding, which
|
48 |
* has separate fields in the irq number for type,
|
49 |
* CPU number and interrupt number.
|
50 |
*/
|
51 |
GICState *s = (GICState *)opaque; |
52 |
int kvm_irq, irqtype, cpu;
|
53 |
|
54 |
if (irq < (s->num_irq - GIC_INTERNAL)) {
|
55 |
/* External interrupt. The kernel numbers these like the GIC
|
56 |
* hardware, with external interrupt IDs starting after the
|
57 |
* internal ones.
|
58 |
*/
|
59 |
irqtype = KVM_ARM_IRQ_TYPE_SPI; |
60 |
cpu = 0;
|
61 |
irq += GIC_INTERNAL; |
62 |
} else {
|
63 |
/* Internal interrupt: decode into (cpu, interrupt id) */
|
64 |
irqtype = KVM_ARM_IRQ_TYPE_PPI; |
65 |
irq -= (s->num_irq - GIC_INTERNAL); |
66 |
cpu = irq / GIC_INTERNAL; |
67 |
irq %= GIC_INTERNAL; |
68 |
} |
69 |
kvm_irq = (irqtype << KVM_ARM_IRQ_TYPE_SHIFT) |
70 |
| (cpu << KVM_ARM_IRQ_VCPU_SHIFT) | irq; |
71 |
|
72 |
kvm_set_irq(kvm_state, kvm_irq, !!level); |
73 |
} |
74 |
|
75 |
static void kvm_arm_gic_put(GICState *s) |
76 |
{ |
77 |
/* TODO: there isn't currently a kernel interface to set the GIC state */
|
78 |
} |
79 |
|
80 |
static void kvm_arm_gic_get(GICState *s) |
81 |
{ |
82 |
/* TODO: there isn't currently a kernel interface to get the GIC state */
|
83 |
} |
84 |
|
85 |
static void kvm_arm_gic_reset(DeviceState *dev) |
86 |
{ |
87 |
GICState *s = ARM_GIC_COMMON(dev); |
88 |
KVMARMGICClass *kgc = KVM_ARM_GIC_GET_CLASS(s); |
89 |
|
90 |
kgc->parent_reset(dev); |
91 |
kvm_arm_gic_put(s); |
92 |
} |
93 |
|
94 |
static void kvm_arm_gic_realize(DeviceState *dev, Error **errp) |
95 |
{ |
96 |
int i;
|
97 |
GICState *s = KVM_ARM_GIC(dev); |
98 |
SysBusDevice *sbd = SYS_BUS_DEVICE(dev); |
99 |
KVMARMGICClass *kgc = KVM_ARM_GIC_GET_CLASS(s); |
100 |
|
101 |
kgc->parent_realize(dev, errp); |
102 |
if (error_is_set(errp)) {
|
103 |
return;
|
104 |
} |
105 |
|
106 |
i = s->num_irq - GIC_INTERNAL; |
107 |
/* For the GIC, also expose incoming GPIO lines for PPIs for each CPU.
|
108 |
* GPIO array layout is thus:
|
109 |
* [0..N-1] SPIs
|
110 |
* [N..N+31] PPIs for CPU 0
|
111 |
* [N+32..N+63] PPIs for CPU 1
|
112 |
* ...
|
113 |
*/
|
114 |
i += (GIC_INTERNAL * s->num_cpu); |
115 |
qdev_init_gpio_in(dev, kvm_arm_gic_set_irq, i); |
116 |
/* We never use our outbound IRQ lines but provide them so that
|
117 |
* we maintain the same interface as the non-KVM GIC.
|
118 |
*/
|
119 |
for (i = 0; i < s->num_cpu; i++) { |
120 |
sysbus_init_irq(sbd, &s->parent_irq[i]); |
121 |
} |
122 |
/* Distributor */
|
123 |
memory_region_init_reservation(&s->iomem, NULL, "kvm-gic_dist", 0x1000); |
124 |
sysbus_init_mmio(sbd, &s->iomem); |
125 |
kvm_arm_register_device(&s->iomem, |
126 |
(KVM_ARM_DEVICE_VGIC_V2 << KVM_ARM_DEVICE_ID_SHIFT) |
127 |
| KVM_VGIC_V2_ADDR_TYPE_DIST); |
128 |
/* CPU interface for current core. Unlike arm_gic, we don't
|
129 |
* provide the "interface for core #N" memory regions, because
|
130 |
* cores with a VGIC don't have those.
|
131 |
*/
|
132 |
memory_region_init_reservation(&s->cpuiomem[0], NULL, "kvm-gic_cpu", 0x1000); |
133 |
sysbus_init_mmio(sbd, &s->cpuiomem[0]);
|
134 |
kvm_arm_register_device(&s->cpuiomem[0],
|
135 |
(KVM_ARM_DEVICE_VGIC_V2 << KVM_ARM_DEVICE_ID_SHIFT) |
136 |
| KVM_VGIC_V2_ADDR_TYPE_CPU); |
137 |
} |
138 |
|
139 |
static void kvm_arm_gic_class_init(ObjectClass *klass, void *data) |
140 |
{ |
141 |
DeviceClass *dc = DEVICE_CLASS(klass); |
142 |
ARMGICCommonClass *agcc = ARM_GIC_COMMON_CLASS(klass); |
143 |
KVMARMGICClass *kgc = KVM_ARM_GIC_CLASS(klass); |
144 |
|
145 |
agcc->pre_save = kvm_arm_gic_get; |
146 |
agcc->post_load = kvm_arm_gic_put; |
147 |
kgc->parent_realize = dc->realize; |
148 |
kgc->parent_reset = dc->reset; |
149 |
dc->realize = kvm_arm_gic_realize; |
150 |
dc->reset = kvm_arm_gic_reset; |
151 |
dc->no_user = 1;
|
152 |
} |
153 |
|
154 |
static const TypeInfo kvm_arm_gic_info = { |
155 |
.name = TYPE_KVM_ARM_GIC, |
156 |
.parent = TYPE_ARM_GIC_COMMON, |
157 |
.instance_size = sizeof(GICState),
|
158 |
.class_init = kvm_arm_gic_class_init, |
159 |
.class_size = sizeof(KVMARMGICClass),
|
160 |
}; |
161 |
|
162 |
static void kvm_arm_gic_register_types(void) |
163 |
{ |
164 |
type_register_static(&kvm_arm_gic_info); |
165 |
} |
166 |
|
167 |
type_init(kvm_arm_gic_register_types) |