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 "qemu-common.h" 28 #include "cpu.h" 29 #include <sys/ioctl.h> 30 #include "exec/address-spaces.h" 31 #include "hw/hw.h" 32 #include "hw/ppc/openpic.h" 33 #include "hw/pci/msi.h" 34 #include "hw/sysbus.h" 35 #include "sysemu/kvm.h" 36 #include "qemu/log.h" 37 38 #define GCR_RESET 0x80000000 39 40 #define KVM_OPENPIC(obj) \ 41 OBJECT_CHECK(KVMOpenPICState, (obj), TYPE_KVM_OPENPIC) 42 43 typedef struct KVMOpenPICState { 44 /*< private >*/ 45 SysBusDevice parent_obj; 46 /*< public >*/ 47 48 MemoryRegion mem; 49 MemoryListener mem_listener; 50 uint32_t fd; 51 uint32_t model; 52 hwaddr mapped; 53 } KVMOpenPICState; 54 55 static void kvm_openpic_set_irq(void *opaque, int n_IRQ, int level) 56 { 57 kvm_set_irq(kvm_state, n_IRQ, level); 58 } 59 60 static void kvm_openpic_write(void *opaque, hwaddr addr, uint64_t val, 61 unsigned size) 62 { 63 KVMOpenPICState *opp = opaque; 64 struct kvm_device_attr attr; 65 uint32_t val32 = val; 66 int ret; 67 68 attr.group = KVM_DEV_MPIC_GRP_REGISTER; 69 attr.attr = addr; 70 attr.addr = (uint64_t)(unsigned long)&val32; 71 72 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 73 if (ret < 0) { 74 qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__, 75 strerror(errno), attr.attr); 76 } 77 } 78 79 static void kvm_openpic_reset(DeviceState *d) 80 { 81 KVMOpenPICState *opp = KVM_OPENPIC(d); 82 83 /* Trigger the GCR.RESET bit to reset the PIC */ 84 kvm_openpic_write(opp, 0x1020, GCR_RESET, sizeof(uint32_t)); 85 } 86 87 static uint64_t kvm_openpic_read(void *opaque, hwaddr addr, unsigned size) 88 { 89 KVMOpenPICState *opp = opaque; 90 struct kvm_device_attr attr; 91 uint32_t val = 0xdeadbeef; 92 int ret; 93 94 attr.group = KVM_DEV_MPIC_GRP_REGISTER; 95 attr.attr = addr; 96 attr.addr = (uint64_t)(unsigned long)&val; 97 98 ret = ioctl(opp->fd, KVM_GET_DEVICE_ATTR, &attr); 99 if (ret < 0) { 100 qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__, 101 strerror(errno), attr.attr); 102 return 0; 103 } 104 105 return val; 106 } 107 108 static const MemoryRegionOps kvm_openpic_mem_ops = { 109 .write = kvm_openpic_write, 110 .read = kvm_openpic_read, 111 .endianness = DEVICE_BIG_ENDIAN, 112 .impl = { 113 .min_access_size = 4, 114 .max_access_size = 4, 115 }, 116 }; 117 118 static void kvm_openpic_region_add(MemoryListener *listener, 119 MemoryRegionSection *section) 120 { 121 KVMOpenPICState *opp = container_of(listener, KVMOpenPICState, 122 mem_listener); 123 struct kvm_device_attr attr; 124 uint64_t reg_base; 125 int ret; 126 127 if (section->address_space != &address_space_memory) { 128 abort(); 129 } 130 131 /* Ignore events on regions that are not us */ 132 if (section->mr != &opp->mem) { 133 return; 134 } 135 136 if (opp->mapped) { 137 /* 138 * We can only map the MPIC once. Since we are already mapped, 139 * the best we can do is ignore new maps. 140 */ 141 return; 142 } 143 144 reg_base = section->offset_within_address_space; 145 opp->mapped = reg_base; 146 147 attr.group = KVM_DEV_MPIC_GRP_MISC; 148 attr.attr = KVM_DEV_MPIC_BASE_ADDR; 149 attr.addr = (uint64_t)(unsigned long)®_base; 150 151 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 152 if (ret < 0) { 153 fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__, 154 strerror(errno), reg_base); 155 } 156 } 157 158 static void kvm_openpic_region_del(MemoryListener *listener, 159 MemoryRegionSection *section) 160 { 161 KVMOpenPICState *opp = container_of(listener, KVMOpenPICState, 162 mem_listener); 163 struct kvm_device_attr attr; 164 uint64_t reg_base = 0; 165 int ret; 166 167 /* Ignore events on regions that are not us */ 168 if (section->mr != &opp->mem) { 169 return; 170 } 171 172 if (section->offset_within_address_space != opp->mapped) { 173 /* 174 * We can only map the MPIC once. This mapping was a secondary 175 * one that we couldn't fulfill. Ignore it. 176 */ 177 return; 178 } 179 opp->mapped = 0; 180 181 attr.group = KVM_DEV_MPIC_GRP_MISC; 182 attr.attr = KVM_DEV_MPIC_BASE_ADDR; 183 attr.addr = (uint64_t)(unsigned long)®_base; 184 185 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 186 if (ret < 0) { 187 fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__, 188 strerror(errno), reg_base); 189 } 190 } 191 192 static void kvm_openpic_init(Object *obj) 193 { 194 KVMOpenPICState *opp = KVM_OPENPIC(obj); 195 196 memory_region_init_io(&opp->mem, OBJECT(opp), &kvm_openpic_mem_ops, opp, 197 "kvm-openpic", 0x40000); 198 } 199 200 static void kvm_openpic_realize(DeviceState *dev, Error **errp) 201 { 202 SysBusDevice *d = SYS_BUS_DEVICE(dev); 203 KVMOpenPICState *opp = KVM_OPENPIC(dev); 204 KVMState *s = kvm_state; 205 int kvm_openpic_model; 206 struct kvm_create_device cd = {0}; 207 int ret, i; 208 209 if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) { 210 error_setg(errp, "Kernel is lacking Device Control API"); 211 return; 212 } 213 214 switch (opp->model) { 215 case OPENPIC_MODEL_FSL_MPIC_20: 216 kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_20; 217 break; 218 219 case OPENPIC_MODEL_FSL_MPIC_42: 220 kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_42; 221 break; 222 223 default: 224 error_setg(errp, "Unsupported OpenPIC model %" PRIu32, opp->model); 225 return; 226 } 227 228 cd.type = kvm_openpic_model; 229 ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &cd); 230 if (ret < 0) { 231 error_setg(errp, "Can't create device %d: %s", 232 cd.type, strerror(errno)); 233 return; 234 } 235 opp->fd = cd.fd; 236 237 sysbus_init_mmio(d, &opp->mem); 238 qdev_init_gpio_in(dev, kvm_openpic_set_irq, OPENPIC_MAX_IRQ); 239 240 opp->mem_listener.region_add = kvm_openpic_region_add; 241 opp->mem_listener.region_del = kvm_openpic_region_del; 242 memory_listener_register(&opp->mem_listener, &address_space_memory); 243 244 /* indicate pic capabilities */ 245 msi_nonbroken = true; 246 kvm_kernel_irqchip = true; 247 kvm_async_interrupts_allowed = true; 248 249 /* set up irq routing */ 250 kvm_init_irq_routing(kvm_state); 251 for (i = 0; i < 256; ++i) { 252 kvm_irqchip_add_irq_route(kvm_state, i, 0, i); 253 } 254 255 kvm_msi_via_irqfd_allowed = true; 256 kvm_gsi_routing_allowed = true; 257 258 kvm_irqchip_commit_routes(s); 259 } 260 261 int kvm_openpic_connect_vcpu(DeviceState *d, CPUState *cs) 262 { 263 KVMOpenPICState *opp = KVM_OPENPIC(d); 264 265 return kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_MPIC, 0, opp->fd, 266 kvm_arch_vcpu_id(cs)); 267 } 268 269 static Property kvm_openpic_properties[] = { 270 DEFINE_PROP_UINT32("model", KVMOpenPICState, model, 271 OPENPIC_MODEL_FSL_MPIC_20), 272 DEFINE_PROP_END_OF_LIST(), 273 }; 274 275 static void kvm_openpic_class_init(ObjectClass *oc, void *data) 276 { 277 DeviceClass *dc = DEVICE_CLASS(oc); 278 279 dc->realize = kvm_openpic_realize; 280 dc->props = kvm_openpic_properties; 281 dc->reset = kvm_openpic_reset; 282 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 283 } 284 285 static const TypeInfo kvm_openpic_info = { 286 .name = TYPE_KVM_OPENPIC, 287 .parent = TYPE_SYS_BUS_DEVICE, 288 .instance_size = sizeof(KVMOpenPICState), 289 .instance_init = kvm_openpic_init, 290 .class_init = kvm_openpic_class_init, 291 }; 292 293 static void kvm_openpic_register_types(void) 294 { 295 type_register_static(&kvm_openpic_info); 296 } 297 298 type_init(kvm_openpic_register_types) 299