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 <sys/ioctl.h> 28 #include "hw/ppc/openpic.h" 29 #include "hw/ppc/openpic_kvm.h" 30 #include "hw/pci/msi.h" 31 #include "hw/qdev-properties.h" 32 #include "hw/sysbus.h" 33 #include "sysemu/kvm.h" 34 #include "qemu/log.h" 35 #include "qemu/module.h" 36 #include "qom/object.h" 37 38 #define GCR_RESET 0x80000000 39 40 OBJECT_DECLARE_SIMPLE_TYPE(KVMOpenPICState, KVM_OPENPIC) 41 42 struct KVMOpenPICState { 43 /*< private >*/ 44 SysBusDevice parent_obj; 45 /*< public >*/ 46 47 MemoryRegion mem; 48 MemoryListener mem_listener; 49 uint32_t fd; 50 uint32_t model; 51 hwaddr mapped; 52 }; 53 54 static void kvm_openpic_set_irq(void *opaque, int n_IRQ, int level) 55 { 56 kvm_set_irq(kvm_state, n_IRQ, level); 57 } 58 59 static void kvm_openpic_write(void *opaque, hwaddr addr, uint64_t val, 60 unsigned size) 61 { 62 KVMOpenPICState *opp = opaque; 63 struct kvm_device_attr attr; 64 uint32_t val32 = val; 65 int ret; 66 67 attr.group = KVM_DEV_MPIC_GRP_REGISTER; 68 attr.attr = addr; 69 attr.addr = (uint64_t)(unsigned long)&val32; 70 71 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 72 if (ret < 0) { 73 qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__, 74 strerror(errno), attr.attr); 75 } 76 } 77 78 static void kvm_openpic_reset(DeviceState *d) 79 { 80 KVMOpenPICState *opp = KVM_OPENPIC(d); 81 82 /* Trigger the GCR.RESET bit to reset the PIC */ 83 kvm_openpic_write(opp, 0x1020, GCR_RESET, sizeof(uint32_t)); 84 } 85 86 static uint64_t kvm_openpic_read(void *opaque, hwaddr addr, unsigned size) 87 { 88 KVMOpenPICState *opp = opaque; 89 struct kvm_device_attr attr; 90 uint32_t val = 0xdeadbeef; 91 int ret; 92 93 attr.group = KVM_DEV_MPIC_GRP_REGISTER; 94 attr.attr = addr; 95 attr.addr = (uint64_t)(unsigned long)&val; 96 97 ret = ioctl(opp->fd, KVM_GET_DEVICE_ATTR, &attr); 98 if (ret < 0) { 99 qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__, 100 strerror(errno), attr.attr); 101 return 0; 102 } 103 104 return val; 105 } 106 107 static const MemoryRegionOps kvm_openpic_mem_ops = { 108 .write = kvm_openpic_write, 109 .read = kvm_openpic_read, 110 .endianness = DEVICE_BIG_ENDIAN, 111 .impl = { 112 .min_access_size = 4, 113 .max_access_size = 4, 114 }, 115 }; 116 117 static void kvm_openpic_region_add(MemoryListener *listener, 118 MemoryRegionSection *section) 119 { 120 KVMOpenPICState *opp = container_of(listener, KVMOpenPICState, 121 mem_listener); 122 struct kvm_device_attr attr; 123 uint64_t reg_base; 124 int ret; 125 126 /* Ignore events on regions that are not us */ 127 if (section->mr != &opp->mem) { 128 return; 129 } 130 131 if (opp->mapped) { 132 /* 133 * We can only map the MPIC once. Since we are already mapped, 134 * the best we can do is ignore new maps. 135 */ 136 return; 137 } 138 139 reg_base = section->offset_within_address_space; 140 opp->mapped = reg_base; 141 142 attr.group = KVM_DEV_MPIC_GRP_MISC; 143 attr.attr = KVM_DEV_MPIC_BASE_ADDR; 144 attr.addr = (uint64_t)(unsigned long)®_base; 145 146 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 147 if (ret < 0) { 148 fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__, 149 strerror(errno), reg_base); 150 } 151 } 152 153 static void kvm_openpic_region_del(MemoryListener *listener, 154 MemoryRegionSection *section) 155 { 156 KVMOpenPICState *opp = container_of(listener, KVMOpenPICState, 157 mem_listener); 158 struct kvm_device_attr attr; 159 uint64_t reg_base = 0; 160 int ret; 161 162 /* Ignore events on regions that are not us */ 163 if (section->mr != &opp->mem) { 164 return; 165 } 166 167 if (section->offset_within_address_space != opp->mapped) { 168 /* 169 * We can only map the MPIC once. This mapping was a secondary 170 * one that we couldn't fulfill. Ignore it. 171 */ 172 return; 173 } 174 opp->mapped = 0; 175 176 attr.group = KVM_DEV_MPIC_GRP_MISC; 177 attr.attr = KVM_DEV_MPIC_BASE_ADDR; 178 attr.addr = (uint64_t)(unsigned long)®_base; 179 180 ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr); 181 if (ret < 0) { 182 fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__, 183 strerror(errno), reg_base); 184 } 185 } 186 187 static void kvm_openpic_init(Object *obj) 188 { 189 KVMOpenPICState *opp = KVM_OPENPIC(obj); 190 191 memory_region_init_io(&opp->mem, OBJECT(opp), &kvm_openpic_mem_ops, opp, 192 "kvm-openpic", 0x40000); 193 } 194 195 static void kvm_openpic_realize(DeviceState *dev, Error **errp) 196 { 197 SysBusDevice *d = SYS_BUS_DEVICE(dev); 198 KVMOpenPICState *opp = KVM_OPENPIC(dev); 199 KVMState *s = kvm_state; 200 int kvm_openpic_model; 201 struct kvm_create_device cd = {0}; 202 int ret, i; 203 204 if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) { 205 error_setg(errp, "Kernel is lacking Device Control API"); 206 return; 207 } 208 209 switch (opp->model) { 210 case OPENPIC_MODEL_FSL_MPIC_20: 211 kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_20; 212 break; 213 214 case OPENPIC_MODEL_FSL_MPIC_42: 215 kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_42; 216 break; 217 218 default: 219 error_setg(errp, "Unsupported OpenPIC model %" PRIu32, opp->model); 220 return; 221 } 222 223 cd.type = kvm_openpic_model; 224 ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &cd); 225 if (ret < 0) { 226 error_setg(errp, "Can't create device %d: %s", 227 cd.type, strerror(errno)); 228 return; 229 } 230 opp->fd = cd.fd; 231 232 sysbus_init_mmio(d, &opp->mem); 233 qdev_init_gpio_in(dev, kvm_openpic_set_irq, OPENPIC_MAX_IRQ); 234 235 opp->mem_listener.region_add = kvm_openpic_region_add; 236 opp->mem_listener.region_del = kvm_openpic_region_del; 237 opp->mem_listener.name = "openpic-kvm"; 238 memory_listener_register(&opp->mem_listener, &address_space_memory); 239 240 /* indicate pic capabilities */ 241 msi_nonbroken = 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 device_class_set_props(dc, kvm_openpic_properties); 277 device_class_set_legacy_reset(dc, 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