| 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 2.1 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 | |
| 28 | #include "qemu/osdep.h" |
| 29 | #include "qapi/error.h" |
| 30 | #include "hw/core/sysbus.h" |
| 31 | #include "hw/core/irq.h" |
| 32 | #include "hw/pci/msi.h" |
| 33 | #include "hw/core/qdev-properties.h" |
| 34 | #include "system/kvm.h" |
| 35 | #include "qemu/log.h" |
| 36 | #include "qemu/module.h" |
| 37 | #include "qom/object.h" |
| 38 | |
| 39 | #define TYPE_ARM_GICV2M "arm-gicv2m" |
| 40 | OBJECT_DECLARE_SIMPLE_TYPE(ARMGICv2mState, ARM_GICV2M) |
| 41 | |
| 42 | #define GICV2M_NUM_SPI_MAX 128 |
| 43 | |
| 44 | #define V2M_MSI_TYPER 0x008 |
| 45 | #define V2M_MSI_SETSPI_NS 0x040 |
| 46 | #define V2M_MSI_IIDR 0xFCC |
| 47 | #define V2M_IIDR0 0xFD0 |
| 48 | #define V2M_IIDR11 0xFFC |
| 49 | |
| 50 | #define PRODUCT_ID_QEMU 0x51 /* ASCII code Q */ |
| 51 | |
| 52 | struct ARMGICv2mState { |
| 53 | SysBusDevice parent_obj; |
| 54 | |
| 55 | MemoryRegion iomem; |
| 56 | qemu_irq spi[GICV2M_NUM_SPI_MAX]; |
| 57 | |
| 58 | uint32_t base_spi; |
| 59 | uint32_t num_spi; |
| 60 | }; |
| 61 | |
| 62 | static void gicv2m_set_irq(void *opaque, int irq) |
| 63 | { |
| 64 | ARMGICv2mState *s = (ARMGICv2mState *)opaque; |
| 65 | |
| 66 | qemu_irq_pulse(s->spi[irq]); |
| 67 | } |
| 68 | |
| 69 | static uint64_t gicv2m_read(void *opaque, hwaddr offset, |
| 70 | unsigned size) |
| 71 | { |
| 72 | ARMGICv2mState *s = (ARMGICv2mState *)opaque; |
| 73 | uint32_t val; |
| 74 | |
| 75 | if (size != 4) { |
| 76 | qemu_log_mask(LOG_GUEST_ERROR, "gicv2m_read: bad size %u\n", size); |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | switch (offset) { |
| 81 | case V2M_MSI_TYPER: |
| 82 | val = (s->base_spi + 32) << 16; |
| 83 | val |= s->num_spi; |
| 84 | return val; |
| 85 | case V2M_MSI_IIDR: |
| 86 | /* We don't have any valid implementor so we leave that field as zero |
| 87 | * and we return 0 in the arch revision as per the spec. |
| 88 | */ |
| 89 | return (PRODUCT_ID_QEMU << 20); |
| 90 | case V2M_IIDR0 ... V2M_IIDR11: |
| 91 | /* We do not implement any optional identification registers and the |
| 92 | * mandatory MSI_PIDR2 register reads as 0x0, so we capture all |
| 93 | * implementation defined registers here. |
| 94 | */ |
| 95 | return 0; |
| 96 | default: |
| 97 | qemu_log_mask(LOG_GUEST_ERROR, |
| 98 | "gicv2m_read: Bad offset %x\n", (int)offset); |
| 99 | return 0; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | static void gicv2m_write(void *opaque, hwaddr offset, |
| 104 | uint64_t value, unsigned size) |
| 105 | { |
| 106 | ARMGICv2mState *s = (ARMGICv2mState *)opaque; |
| 107 | |
| 108 | if (size != 2 && size != 4) { |
| 109 | qemu_log_mask(LOG_GUEST_ERROR, "gicv2m_write: bad size %u\n", size); |
| 110 | return; |
| 111 | } |
| 112 | |
| 113 | switch (offset) { |
| 114 | case V2M_MSI_SETSPI_NS: { |
| 115 | int spi; |
| 116 | |
| 117 | spi = (value & 0x3ff) - (s->base_spi + 32); |
| 118 | if (spi >= 0 && spi < s->num_spi) { |
| 119 | gicv2m_set_irq(s, spi); |
| 120 | } |
| 121 | return; |
| 122 | } |
| 123 | default: |
| 124 | qemu_log_mask(LOG_GUEST_ERROR, |
| 125 | "gicv2m_write: Bad offset %x\n", (int)offset); |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | static const MemoryRegionOps gicv2m_ops = { |
| 130 | .read = gicv2m_read, |
| 131 | .write = gicv2m_write, |
| 132 | .endianness = DEVICE_LITTLE_ENDIAN, |
| 133 | }; |
| 134 | |
| 135 | static void gicv2m_realize(DeviceState *dev, Error **errp) |
| 136 | { |
| 137 | ARMGICv2mState *s = ARM_GICV2M(dev); |
| 138 | int i; |
| 139 | |
| 140 | if (s->num_spi > GICV2M_NUM_SPI_MAX) { |
| 141 | error_setg(errp, |
| 142 | "requested %u SPIs exceeds GICv2m frame maximum %d", |
| 143 | s->num_spi, GICV2M_NUM_SPI_MAX); |
| 144 | return; |
| 145 | } |
| 146 | |
| 147 | if (s->base_spi + 32 > 1020 - s->num_spi) { |
| 148 | error_setg(errp, |
| 149 | "requested base SPI %u+%u exceeds max. number 1020", |
| 150 | s->base_spi + 32, s->num_spi); |
| 151 | return; |
| 152 | } |
| 153 | |
| 154 | for (i = 0; i < s->num_spi; i++) { |
| 155 | sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->spi[i]); |
| 156 | } |
| 157 | |
| 158 | msi_nonbroken = true; |
| 159 | kvm_gsi_direct_mapping = true; |
| 160 | kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled(); |
| 161 | } |
| 162 | |
| 163 | static void gicv2m_init(Object *obj) |
| 164 | { |
| 165 | SysBusDevice *sbd = SYS_BUS_DEVICE(obj); |
| 166 | ARMGICv2mState *s = ARM_GICV2M(obj); |
| 167 | |
| 168 | memory_region_init_io(&s->iomem, OBJECT(s), &gicv2m_ops, s, |
| 169 | "gicv2m", 0x1000); |
| 170 | sysbus_init_mmio(sbd, &s->iomem); |
| 171 | } |
| 172 | |
| 173 | static const Property gicv2m_properties[] = { |
| 174 | DEFINE_PROP_UINT32("base-spi", ARMGICv2mState, base_spi, 0), |
| 175 | DEFINE_PROP_UINT32("num-spi", ARMGICv2mState, num_spi, 64), |
| 176 | }; |
| 177 | |
| 178 | static void gicv2m_class_init(ObjectClass *klass, const void *data) |
| 179 | { |
| 180 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 181 | |
| 182 | device_class_set_props(dc, gicv2m_properties); |
| 183 | dc->realize = gicv2m_realize; |
| 184 | } |
| 185 | |
| 186 | static const TypeInfo gicv2m_info = { |
| 187 | .name = TYPE_ARM_GICV2M, |
| 188 | .parent = TYPE_SYS_BUS_DEVICE, |
| 189 | .instance_size = sizeof(ARMGICv2mState), |
| 190 | .instance_init = gicv2m_init, |
| 191 | .class_init = gicv2m_class_init, |
| 192 | }; |
| 193 | |
| 194 | static void gicv2m_register_types(void) |
| 195 | { |
| 196 | type_register_static(&gicv2m_info); |
| 197 | } |
| 198 | |
| 199 | type_init(gicv2m_register_types) |