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1 | /* |
2 | * GICv2m extension for MSI/MSI-x support with a GICv2-based system | |
3 | * | |
4 | * Copyright (C) 2015 Linaro, All rights reserved. | |
5 | * | |
6 | * Author: Christoffer Dall <christoffer.dall@linaro.org> | |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
22 | /* This file implements an emulated GICv2m widget as described in the ARM | |
23 | * Server Base System Architecture (SBSA) specification Version 2.2 | |
24 | * (ARM-DEN-0029 v2.2) pages 35-39 without any optional implementation defined | |
25 | * identification registers and with a single non-secure MSI register frame. | |
26 | */ | |
27 | ||
8ef94f0b | 28 | #include "qemu/osdep.h" |
da34e65c | 29 | #include "qapi/error.h" |
770c58f8 CD |
30 | #include "hw/sysbus.h" |
31 | #include "hw/pci/msi.h" | |
32 | ||
33 | #define TYPE_ARM_GICV2M "arm-gicv2m" | |
34 | #define ARM_GICV2M(obj) OBJECT_CHECK(ARMGICv2mState, (obj), TYPE_ARM_GICV2M) | |
35 | ||
36 | #define GICV2M_NUM_SPI_MAX 128 | |
37 | ||
38 | #define V2M_MSI_TYPER 0x008 | |
39 | #define V2M_MSI_SETSPI_NS 0x040 | |
40 | #define V2M_MSI_IIDR 0xFCC | |
41 | #define V2M_IIDR0 0xFD0 | |
42 | #define V2M_IIDR11 0xFFC | |
43 | ||
44 | #define PRODUCT_ID_QEMU 0x51 /* ASCII code Q */ | |
45 | ||
46 | typedef struct ARMGICv2mState { | |
47 | SysBusDevice parent_obj; | |
48 | ||
49 | MemoryRegion iomem; | |
50 | qemu_irq spi[GICV2M_NUM_SPI_MAX]; | |
51 | ||
52 | uint32_t base_spi; | |
53 | uint32_t num_spi; | |
54 | } ARMGICv2mState; | |
55 | ||
56 | static void gicv2m_set_irq(void *opaque, int irq) | |
57 | { | |
58 | ARMGICv2mState *s = (ARMGICv2mState *)opaque; | |
59 | ||
60 | qemu_irq_pulse(s->spi[irq]); | |
61 | } | |
62 | ||
63 | static uint64_t gicv2m_read(void *opaque, hwaddr offset, | |
64 | unsigned size) | |
65 | { | |
66 | ARMGICv2mState *s = (ARMGICv2mState *)opaque; | |
67 | uint32_t val; | |
68 | ||
69 | if (size != 4) { | |
70 | qemu_log_mask(LOG_GUEST_ERROR, "gicv2m_read: bad size %u\n", size); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | switch (offset) { | |
75 | case V2M_MSI_TYPER: | |
76 | val = (s->base_spi + 32) << 16; | |
77 | val |= s->num_spi; | |
78 | return val; | |
79 | case V2M_MSI_IIDR: | |
80 | /* We don't have any valid implementor so we leave that field as zero | |
81 | * and we return 0 in the arch revision as per the spec. | |
82 | */ | |
83 | return (PRODUCT_ID_QEMU << 20); | |
84 | case V2M_IIDR0 ... V2M_IIDR11: | |
85 | /* We do not implement any optional identification registers and the | |
86 | * mandatory MSI_PIDR2 register reads as 0x0, so we capture all | |
87 | * implementation defined registers here. | |
88 | */ | |
89 | return 0; | |
90 | default: | |
91 | qemu_log_mask(LOG_GUEST_ERROR, | |
92 | "gicv2m_read: Bad offset %x\n", (int)offset); | |
93 | return 0; | |
94 | } | |
95 | } | |
96 | ||
97 | static void gicv2m_write(void *opaque, hwaddr offset, | |
98 | uint64_t value, unsigned size) | |
99 | { | |
100 | ARMGICv2mState *s = (ARMGICv2mState *)opaque; | |
101 | ||
102 | if (size != 2 && size != 4) { | |
103 | qemu_log_mask(LOG_GUEST_ERROR, "gicv2m_write: bad size %u\n", size); | |
104 | return; | |
105 | } | |
106 | ||
107 | switch (offset) { | |
108 | case V2M_MSI_SETSPI_NS: { | |
109 | int spi; | |
110 | ||
111 | spi = (value & 0x3ff) - (s->base_spi + 32); | |
112 | if (spi >= 0 && spi < s->num_spi) { | |
113 | gicv2m_set_irq(s, spi); | |
114 | } | |
115 | return; | |
116 | } | |
117 | default: | |
118 | qemu_log_mask(LOG_GUEST_ERROR, | |
119 | "gicv2m_write: Bad offset %x\n", (int)offset); | |
120 | } | |
121 | } | |
122 | ||
123 | static const MemoryRegionOps gicv2m_ops = { | |
124 | .read = gicv2m_read, | |
125 | .write = gicv2m_write, | |
126 | .endianness = DEVICE_LITTLE_ENDIAN, | |
127 | }; | |
128 | ||
129 | static void gicv2m_realize(DeviceState *dev, Error **errp) | |
130 | { | |
131 | ARMGICv2mState *s = ARM_GICV2M(dev); | |
132 | int i; | |
133 | ||
134 | if (s->num_spi > GICV2M_NUM_SPI_MAX) { | |
135 | error_setg(errp, | |
136 | "requested %u SPIs exceeds GICv2m frame maximum %d", | |
137 | s->num_spi, GICV2M_NUM_SPI_MAX); | |
138 | return; | |
139 | } | |
140 | ||
141 | if (s->base_spi + 32 > 1020 - s->num_spi) { | |
142 | error_setg(errp, | |
143 | "requested base SPI %u+%u exceeds max. number 1020", | |
144 | s->base_spi + 32, s->num_spi); | |
145 | return; | |
146 | } | |
147 | ||
148 | for (i = 0; i < s->num_spi; i++) { | |
149 | sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->spi[i]); | |
150 | } | |
151 | ||
226419d6 | 152 | msi_nonbroken = true; |
9718e4ae EA |
153 | kvm_gsi_direct_mapping = true; |
154 | kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled(); | |
770c58f8 CD |
155 | } |
156 | ||
157 | static void gicv2m_init(Object *obj) | |
158 | { | |
159 | SysBusDevice *sbd = SYS_BUS_DEVICE(obj); | |
160 | ARMGICv2mState *s = ARM_GICV2M(obj); | |
161 | ||
162 | memory_region_init_io(&s->iomem, OBJECT(s), &gicv2m_ops, s, | |
163 | "gicv2m", 0x1000); | |
164 | sysbus_init_mmio(sbd, &s->iomem); | |
165 | } | |
166 | ||
167 | static Property gicv2m_properties[] = { | |
168 | DEFINE_PROP_UINT32("base-spi", ARMGICv2mState, base_spi, 0), | |
169 | DEFINE_PROP_UINT32("num-spi", ARMGICv2mState, num_spi, 64), | |
170 | DEFINE_PROP_END_OF_LIST(), | |
171 | }; | |
172 | ||
173 | static void gicv2m_class_init(ObjectClass *klass, void *data) | |
174 | { | |
175 | DeviceClass *dc = DEVICE_CLASS(klass); | |
176 | ||
177 | dc->props = gicv2m_properties; | |
178 | dc->realize = gicv2m_realize; | |
179 | } | |
180 | ||
181 | static const TypeInfo gicv2m_info = { | |
182 | .name = TYPE_ARM_GICV2M, | |
183 | .parent = TYPE_SYS_BUS_DEVICE, | |
184 | .instance_size = sizeof(ARMGICv2mState), | |
185 | .instance_init = gicv2m_init, | |
186 | .class_init = gicv2m_class_init, | |
187 | }; | |
188 | ||
189 | static void gicv2m_register_types(void) | |
190 | { | |
191 | type_register_static(&gicv2m_info); | |
192 | } | |
193 | ||
194 | type_init(gicv2m_register_types) |