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 <sys/ioctl.h> 26 #include "exec/address-spaces.h" 27 #include "hw/hw.h" 28 #include "hw/ppc/openpic.h" 29 #include "hw/pci/msi.h" 30 #include "hw/sysbus.h" 31 #include "sysemu/kvm.h" 32 #include "qemu/log.h" 33 34 #define GCR_RESET 0x80000000 35 36 #define KVM_OPENPIC(obj) \ 37 OBJECT_CHECK(KVMOpenPICState, (obj), TYPE_KVM_OPENPIC) 38 39 typedef struct KVMOpenPICState { 40 /*< private >*/ 41 SysBusDevice parent_obj; 42 /*< public >*/ 43 44 MemoryRegion mem; 45 MemoryListener mem_listener; 46 uint32_t fd; 47 uint32_t model; 48 hwaddr mapped; 49 } KVMOpenPICState; 50 51 static void kvm_openpic_set_irq(void *opaque, int n_IRQ, int level) 52 { 53 kvm_set_irq(kvm_state, n_IRQ, level); 54 } 55 56 static void kvm_openpic_write(void *opaque, hwaddr addr, uint64_t val, 57 unsigned size) 58 { 59 KVMOpenPICState *opp = opaque; 60 struct kvm_device_attr attr; 61 uint32_t val32 = val; 62 int ret; 63 64 attr.group = KVM_DEV_MPIC_GRP_REGISTER; 65 attr.attr = addr; 66 attr.addr = (uint64_t)(unsigned long)&val32; 67 68 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 69 if (ret < 0) { 70 qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__, 71 strerror(errno), attr.attr); 72 } 73 } 74 75 static void kvm_openpic_reset(DeviceState *d) 76 { 77 KVMOpenPICState *opp = KVM_OPENPIC(d); 78 79 /* Trigger the GCR.RESET bit to reset the PIC */ 80 kvm_openpic_write(opp, 0x1020, GCR_RESET, sizeof(uint32_t)); 81 } 82 83 static uint64_t kvm_openpic_read(void *opaque, hwaddr addr, unsigned size) 84 { 85 KVMOpenPICState *opp = opaque; 86 struct kvm_device_attr attr; 87 uint32_t val = 0xdeadbeef; 88 int ret; 89 90 attr.group = KVM_DEV_MPIC_GRP_REGISTER; 91 attr.attr = addr; 92 attr.addr = (uint64_t)(unsigned long)&val; 93 94 ret = ioctl(opp->fd, KVM_GET_DEVICE_ATTR, &attr); 95 if (ret < 0) { 96 qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__, 97 strerror(errno), attr.attr); 98 return 0; 99 } 100 101 return val; 102 } 103 104 static const MemoryRegionOps kvm_openpic_mem_ops = { 105 .write = kvm_openpic_write, 106 .read = kvm_openpic_read, 107 .endianness = DEVICE_BIG_ENDIAN, 108 .impl = { 109 .min_access_size = 4, 110 .max_access_size = 4, 111 }, 112 }; 113 114 static void kvm_openpic_region_add(MemoryListener *listener, 115 MemoryRegionSection *section) 116 { 117 KVMOpenPICState *opp = container_of(listener, KVMOpenPICState, 118 mem_listener); 119 struct kvm_device_attr attr; 120 uint64_t reg_base; 121 int ret; 122 123 if (section->address_space != &address_space_memory) { 124 abort(); 125 } 126 127 /* Ignore events on regions that are not us */ 128 if (section->mr != &opp->mem) { 129 return; 130 } 131 132 if (opp->mapped) { 133 /* 134 * We can only map the MPIC once. Since we are already mapped, 135 * the best we can do is ignore new maps. 136 */ 137 return; 138 } 139 140 reg_base = section->offset_within_address_space; 141 opp->mapped = reg_base; 142 143 attr.group = KVM_DEV_MPIC_GRP_MISC; 144 attr.attr = KVM_DEV_MPIC_BASE_ADDR; 145 attr.addr = (uint64_t)(unsigned long)®_base; 146 147 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 148 if (ret < 0) { 149 fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__, 150 strerror(errno), reg_base); 151 } 152 } 153 154 static void kvm_openpic_region_del(MemoryListener *listener, 155 MemoryRegionSection *section) 156 { 157 KVMOpenPICState *opp = container_of(listener, KVMOpenPICState, 158 mem_listener); 159 struct kvm_device_attr attr; 160 uint64_t reg_base = 0; 161 int ret; 162 163 /* Ignore events on regions that are not us */ 164 if (section->mr != &opp->mem) { 165 return; 166 } 167 168 if (section->offset_within_address_space != opp->mapped) { 169 /* 170 * We can only map the MPIC once. This mapping was a secondary 171 * one that we couldn't fulfill. Ignore it. 172 */ 173 return; 174 } 175 opp->mapped = 0; 176 177 attr.group = KVM_DEV_MPIC_GRP_MISC; 178 attr.attr = KVM_DEV_MPIC_BASE_ADDR; 179 attr.addr = (uint64_t)(unsigned long)®_base; 180 181 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 182 if (ret < 0) { 183 fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__, 184 strerror(errno), reg_base); 185 } 186 } 187 188 static void kvm_openpic_init(Object *obj) 189 { 190 KVMOpenPICState *opp = KVM_OPENPIC(obj); 191 192 memory_region_init_io(&opp->mem, OBJECT(opp), &kvm_openpic_mem_ops, opp, 193 "kvm-openpic", 0x40000); 194 } 195 196 static void kvm_openpic_realize(DeviceState *dev, Error **errp) 197 { 198 SysBusDevice *d = SYS_BUS_DEVICE(dev); 199 KVMOpenPICState *opp = KVM_OPENPIC(dev); 200 KVMState *s = kvm_state; 201 int kvm_openpic_model; 202 struct kvm_create_device cd = {0}; 203 int ret, i; 204 205 if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) { 206 error_setg(errp, "Kernel is lacking Device Control API"); 207 return; 208 } 209 210 switch (opp->model) { 211 case OPENPIC_MODEL_FSL_MPIC_20: 212 kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_20; 213 break; 214 215 case OPENPIC_MODEL_FSL_MPIC_42: 216 kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_42; 217 break; 218 219 default: 220 error_setg(errp, "Unsupported OpenPIC model %" PRIu32, opp->model); 221 return; 222 } 223 224 cd.type = kvm_openpic_model; 225 ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &cd); 226 if (ret < 0) { 227 error_setg(errp, "Can't create device %d: %s", 228 cd.type, strerror(errno)); 229 return; 230 } 231 opp->fd = cd.fd; 232 233 sysbus_init_mmio(d, &opp->mem); 234 qdev_init_gpio_in(dev, kvm_openpic_set_irq, OPENPIC_MAX_IRQ); 235 236 opp->mem_listener.region_add = kvm_openpic_region_add; 237 opp->mem_listener.region_del = kvm_openpic_region_del; 238 memory_listener_register(&opp->mem_listener, &address_space_memory); 239 240 /* indicate pic capabilities */ 241 msi_supported = true; 242 kvm_kernel_irqchip = true; 243 kvm_async_interrupts_allowed = true; 244 245 /* set up irq routing */ 246 kvm_init_irq_routing(kvm_state); 247 for (i = 0; i < 256; ++i) { 248 kvm_irqchip_add_irq_route(kvm_state, i, 0, i); 249 } 250 251 kvm_msi_via_irqfd_allowed = true; 252 kvm_gsi_routing_allowed = true; 253 254 kvm_irqchip_commit_routes(s); 255 } 256 257 int kvm_openpic_connect_vcpu(DeviceState *d, CPUState *cs) 258 { 259 KVMOpenPICState *opp = KVM_OPENPIC(d); 260 261 return kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_MPIC, 0, opp->fd, 262 kvm_arch_vcpu_id(cs)); 263 } 264 265 static Property kvm_openpic_properties[] = { 266 DEFINE_PROP_UINT32("model", KVMOpenPICState, model, 267 OPENPIC_MODEL_FSL_MPIC_20), 268 DEFINE_PROP_END_OF_LIST(), 269 }; 270 271 static void kvm_openpic_class_init(ObjectClass *oc, void *data) 272 { 273 DeviceClass *dc = DEVICE_CLASS(oc); 274 275 dc->realize = kvm_openpic_realize; 276 dc->props = kvm_openpic_properties; 277 dc->reset = kvm_openpic_reset; 278 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 279 } 280 281 static const TypeInfo kvm_openpic_info = { 282 .name = TYPE_KVM_OPENPIC, 283 .parent = TYPE_SYS_BUS_DEVICE, 284 .instance_size = sizeof(KVMOpenPICState), 285 .instance_init = kvm_openpic_init, 286 .class_init = kvm_openpic_class_init, 287 }; 288 289 static void kvm_openpic_register_types(void) 290 { 291 type_register_static(&kvm_openpic_info); 292 } 293 294 type_init(kvm_openpic_register_types) 295