1 /* 2 * KVM in-kernel OpenPIC 3 * 4 * Copyright 2013 Freescale Semiconductor, Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "qapi/error.h" 27 #include "cpu.h" 28 #include <sys/ioctl.h> 29 #include "exec/address-spaces.h" 30 #include "hw/ppc/openpic.h" 31 #include "hw/ppc/openpic_kvm.h" 32 #include "hw/pci/msi.h" 33 #include "hw/qdev-properties.h" 34 #include "hw/sysbus.h" 35 #include "sysemu/kvm.h" 36 #include "qemu/log.h" 37 #include "qemu/module.h" 38 39 #define GCR_RESET 0x80000000 40 41 #define KVM_OPENPIC(obj) \ 42 OBJECT_CHECK(KVMOpenPICState, (obj), TYPE_KVM_OPENPIC) 43 44 typedef struct KVMOpenPICState { 45 /*< private >*/ 46 SysBusDevice parent_obj; 47 /*< public >*/ 48 49 MemoryRegion mem; 50 MemoryListener mem_listener; 51 uint32_t fd; 52 uint32_t model; 53 hwaddr mapped; 54 } KVMOpenPICState; 55 56 static void kvm_openpic_set_irq(void *opaque, int n_IRQ, int level) 57 { 58 kvm_set_irq(kvm_state, n_IRQ, level); 59 } 60 61 static void kvm_openpic_write(void *opaque, hwaddr addr, uint64_t val, 62 unsigned size) 63 { 64 KVMOpenPICState *opp = opaque; 65 struct kvm_device_attr attr; 66 uint32_t val32 = val; 67 int ret; 68 69 attr.group = KVM_DEV_MPIC_GRP_REGISTER; 70 attr.attr = addr; 71 attr.addr = (uint64_t)(unsigned long)&val32; 72 73 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 74 if (ret < 0) { 75 qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__, 76 strerror(errno), attr.attr); 77 } 78 } 79 80 static void kvm_openpic_reset(DeviceState *d) 81 { 82 KVMOpenPICState *opp = KVM_OPENPIC(d); 83 84 /* Trigger the GCR.RESET bit to reset the PIC */ 85 kvm_openpic_write(opp, 0x1020, GCR_RESET, sizeof(uint32_t)); 86 } 87 88 static uint64_t kvm_openpic_read(void *opaque, hwaddr addr, unsigned size) 89 { 90 KVMOpenPICState *opp = opaque; 91 struct kvm_device_attr attr; 92 uint32_t val = 0xdeadbeef; 93 int ret; 94 95 attr.group = KVM_DEV_MPIC_GRP_REGISTER; 96 attr.attr = addr; 97 attr.addr = (uint64_t)(unsigned long)&val; 98 99 ret = ioctl(opp->fd, KVM_GET_DEVICE_ATTR, &attr); 100 if (ret < 0) { 101 qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__, 102 strerror(errno), attr.attr); 103 return 0; 104 } 105 106 return val; 107 } 108 109 static const MemoryRegionOps kvm_openpic_mem_ops = { 110 .write = kvm_openpic_write, 111 .read = kvm_openpic_read, 112 .endianness = DEVICE_BIG_ENDIAN, 113 .impl = { 114 .min_access_size = 4, 115 .max_access_size = 4, 116 }, 117 }; 118 119 static void kvm_openpic_region_add(MemoryListener *listener, 120 MemoryRegionSection *section) 121 { 122 KVMOpenPICState *opp = container_of(listener, KVMOpenPICState, 123 mem_listener); 124 struct kvm_device_attr attr; 125 uint64_t reg_base; 126 int ret; 127 128 /* Ignore events on regions that are not us */ 129 if (section->mr != &opp->mem) { 130 return; 131 } 132 133 if (opp->mapped) { 134 /* 135 * We can only map the MPIC once. Since we are already mapped, 136 * the best we can do is ignore new maps. 137 */ 138 return; 139 } 140 141 reg_base = section->offset_within_address_space; 142 opp->mapped = reg_base; 143 144 attr.group = KVM_DEV_MPIC_GRP_MISC; 145 attr.attr = KVM_DEV_MPIC_BASE_ADDR; 146 attr.addr = (uint64_t)(unsigned long)®_base; 147 148 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 149 if (ret < 0) { 150 fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__, 151 strerror(errno), reg_base); 152 } 153 } 154 155 static void kvm_openpic_region_del(MemoryListener *listener, 156 MemoryRegionSection *section) 157 { 158 KVMOpenPICState *opp = container_of(listener, KVMOpenPICState, 159 mem_listener); 160 struct kvm_device_attr attr; 161 uint64_t reg_base = 0; 162 int ret; 163 164 /* Ignore events on regions that are not us */ 165 if (section->mr != &opp->mem) { 166 return; 167 } 168 169 if (section->offset_within_address_space != opp->mapped) { 170 /* 171 * We can only map the MPIC once. This mapping was a secondary 172 * one that we couldn't fulfill. Ignore it. 173 */ 174 return; 175 } 176 opp->mapped = 0; 177 178 attr.group = KVM_DEV_MPIC_GRP_MISC; 179 attr.attr = KVM_DEV_MPIC_BASE_ADDR; 180 attr.addr = (uint64_t)(unsigned long)®_base; 181 182 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 183 if (ret < 0) { 184 fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__, 185 strerror(errno), reg_base); 186 } 187 } 188 189 static void kvm_openpic_init(Object *obj) 190 { 191 KVMOpenPICState *opp = KVM_OPENPIC(obj); 192 193 memory_region_init_io(&opp->mem, OBJECT(opp), &kvm_openpic_mem_ops, opp, 194 "kvm-openpic", 0x40000); 195 } 196 197 static void kvm_openpic_realize(DeviceState *dev, Error **errp) 198 { 199 SysBusDevice *d = SYS_BUS_DEVICE(dev); 200 KVMOpenPICState *opp = KVM_OPENPIC(dev); 201 KVMState *s = kvm_state; 202 int kvm_openpic_model; 203 struct kvm_create_device cd = {0}; 204 int ret, i; 205 206 if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) { 207 error_setg(errp, "Kernel is lacking Device Control API"); 208 return; 209 } 210 211 switch (opp->model) { 212 case OPENPIC_MODEL_FSL_MPIC_20: 213 kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_20; 214 break; 215 216 case OPENPIC_MODEL_FSL_MPIC_42: 217 kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_42; 218 break; 219 220 default: 221 error_setg(errp, "Unsupported OpenPIC model %" PRIu32, opp->model); 222 return; 223 } 224 225 cd.type = kvm_openpic_model; 226 ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &cd); 227 if (ret < 0) { 228 error_setg(errp, "Can't create device %d: %s", 229 cd.type, strerror(errno)); 230 return; 231 } 232 opp->fd = cd.fd; 233 234 sysbus_init_mmio(d, &opp->mem); 235 qdev_init_gpio_in(dev, kvm_openpic_set_irq, OPENPIC_MAX_IRQ); 236 237 opp->mem_listener.region_add = kvm_openpic_region_add; 238 opp->mem_listener.region_del = kvm_openpic_region_del; 239 memory_listener_register(&opp->mem_listener, &address_space_memory); 240 241 /* indicate pic capabilities */ 242 msi_nonbroken = true; 243 kvm_kernel_irqchip = true; 244 kvm_async_interrupts_allowed = true; 245 246 /* set up irq routing */ 247 kvm_init_irq_routing(kvm_state); 248 for (i = 0; i < 256; ++i) { 249 kvm_irqchip_add_irq_route(kvm_state, i, 0, i); 250 } 251 252 kvm_msi_via_irqfd_allowed = true; 253 kvm_gsi_routing_allowed = true; 254 255 kvm_irqchip_commit_routes(s); 256 } 257 258 int kvm_openpic_connect_vcpu(DeviceState *d, CPUState *cs) 259 { 260 KVMOpenPICState *opp = KVM_OPENPIC(d); 261 262 return kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_MPIC, 0, opp->fd, 263 kvm_arch_vcpu_id(cs)); 264 } 265 266 static Property kvm_openpic_properties[] = { 267 DEFINE_PROP_UINT32("model", KVMOpenPICState, model, 268 OPENPIC_MODEL_FSL_MPIC_20), 269 DEFINE_PROP_END_OF_LIST(), 270 }; 271 272 static void kvm_openpic_class_init(ObjectClass *oc, void *data) 273 { 274 DeviceClass *dc = DEVICE_CLASS(oc); 275 276 dc->realize = kvm_openpic_realize; 277 dc->props = kvm_openpic_properties; 278 dc->reset = kvm_openpic_reset; 279 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 280 } 281 282 static const TypeInfo kvm_openpic_info = { 283 .name = TYPE_KVM_OPENPIC, 284 .parent = TYPE_SYS_BUS_DEVICE, 285 .instance_size = sizeof(KVMOpenPICState), 286 .instance_init = kvm_openpic_init, 287 .class_init = kvm_openpic_class_init, 288 }; 289 290 static void kvm_openpic_register_types(void) 291 { 292 type_register_static(&kvm_openpic_info); 293 } 294 295 type_init(kvm_openpic_register_types) 296