2 * GICv2m extension for MSI/MSI-x support with a GICv2-based system
4 * Copyright (C) 2015 Linaro, All rights reserved.
6 * Author: Christoffer Dall <christoffer.dall@linaro.org>
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.
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.
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/>.
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.
28 #include "hw/sysbus.h"
29 #include "hw/pci/msi.h"
31 #define TYPE_ARM_GICV2M "arm-gicv2m"
32 #define ARM_GICV2M(obj) OBJECT_CHECK(ARMGICv2mState, (obj), TYPE_ARM_GICV2M)
34 #define GICV2M_NUM_SPI_MAX 128
36 #define V2M_MSI_TYPER 0x008
37 #define V2M_MSI_SETSPI_NS 0x040
38 #define V2M_MSI_IIDR 0xFCC
39 #define V2M_IIDR0 0xFD0
40 #define V2M_IIDR11 0xFFC
42 #define PRODUCT_ID_QEMU 0x51 /* ASCII code Q */
44 typedef struct ARMGICv2mState
{
45 SysBusDevice parent_obj
;
48 qemu_irq spi
[GICV2M_NUM_SPI_MAX
];
54 static void gicv2m_set_irq(void *opaque
, int irq
)
56 ARMGICv2mState
*s
= (ARMGICv2mState
*)opaque
;
58 qemu_irq_pulse(s
->spi
[irq
]);
61 static uint64_t gicv2m_read(void *opaque
, hwaddr offset
,
64 ARMGICv2mState
*s
= (ARMGICv2mState
*)opaque
;
68 qemu_log_mask(LOG_GUEST_ERROR
, "gicv2m_read: bad size %u\n", size
);
74 val
= (s
->base_spi
+ 32) << 16;
78 /* We don't have any valid implementor so we leave that field as zero
79 * and we return 0 in the arch revision as per the spec.
81 return (PRODUCT_ID_QEMU
<< 20);
82 case V2M_IIDR0
... V2M_IIDR11
:
83 /* We do not implement any optional identification registers and the
84 * mandatory MSI_PIDR2 register reads as 0x0, so we capture all
85 * implementation defined registers here.
89 qemu_log_mask(LOG_GUEST_ERROR
,
90 "gicv2m_read: Bad offset %x\n", (int)offset
);
95 static void gicv2m_write(void *opaque
, hwaddr offset
,
96 uint64_t value
, unsigned size
)
98 ARMGICv2mState
*s
= (ARMGICv2mState
*)opaque
;
100 if (size
!= 2 && size
!= 4) {
101 qemu_log_mask(LOG_GUEST_ERROR
, "gicv2m_write: bad size %u\n", size
);
106 case V2M_MSI_SETSPI_NS
: {
109 spi
= (value
& 0x3ff) - (s
->base_spi
+ 32);
110 if (spi
>= 0 && spi
< s
->num_spi
) {
111 gicv2m_set_irq(s
, spi
);
116 qemu_log_mask(LOG_GUEST_ERROR
,
117 "gicv2m_write: Bad offset %x\n", (int)offset
);
121 static const MemoryRegionOps gicv2m_ops
= {
123 .write
= gicv2m_write
,
124 .endianness
= DEVICE_LITTLE_ENDIAN
,
127 static void gicv2m_realize(DeviceState
*dev
, Error
**errp
)
129 ARMGICv2mState
*s
= ARM_GICV2M(dev
);
132 if (s
->num_spi
> GICV2M_NUM_SPI_MAX
) {
134 "requested %u SPIs exceeds GICv2m frame maximum %d",
135 s
->num_spi
, GICV2M_NUM_SPI_MAX
);
139 if (s
->base_spi
+ 32 > 1020 - s
->num_spi
) {
141 "requested base SPI %u+%u exceeds max. number 1020",
142 s
->base_spi
+ 32, s
->num_spi
);
146 for (i
= 0; i
< s
->num_spi
; i
++) {
147 sysbus_init_irq(SYS_BUS_DEVICE(dev
), &s
->spi
[i
]);
150 msi_supported
= true;
151 kvm_gsi_direct_mapping
= true;
152 kvm_msi_via_irqfd_allowed
= kvm_irqfds_enabled();
155 static void gicv2m_init(Object
*obj
)
157 SysBusDevice
*sbd
= SYS_BUS_DEVICE(obj
);
158 ARMGICv2mState
*s
= ARM_GICV2M(obj
);
160 memory_region_init_io(&s
->iomem
, OBJECT(s
), &gicv2m_ops
, s
,
162 sysbus_init_mmio(sbd
, &s
->iomem
);
165 static Property gicv2m_properties
[] = {
166 DEFINE_PROP_UINT32("base-spi", ARMGICv2mState
, base_spi
, 0),
167 DEFINE_PROP_UINT32("num-spi", ARMGICv2mState
, num_spi
, 64),
168 DEFINE_PROP_END_OF_LIST(),
171 static void gicv2m_class_init(ObjectClass
*klass
, void *data
)
173 DeviceClass
*dc
= DEVICE_CLASS(klass
);
175 dc
->props
= gicv2m_properties
;
176 dc
->realize
= gicv2m_realize
;
179 static const TypeInfo gicv2m_info
= {
180 .name
= TYPE_ARM_GICV2M
,
181 .parent
= TYPE_SYS_BUS_DEVICE
,
182 .instance_size
= sizeof(ARMGICv2mState
),
183 .instance_init
= gicv2m_init
,
184 .class_init
= gicv2m_class_init
,
187 static void gicv2m_register_types(void)
189 type_register_static(&gicv2m_info
);
192 type_init(gicv2m_register_types
)