hw/intc/openpic_kvm.c

   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 KVM_OPENPIC(obj) \
  35     OBJECT_CHECK(KVMOpenPICState, (obj), TYPE_KVM_OPENPIC)
  36
  37 typedef struct KVMOpenPICState {
  38     /*< private >*/
  39     SysBusDevice parent_obj;
  40     /*< public >*/
  41
  42     MemoryRegion mem;
  43     MemoryListener mem_listener;
  44     uint32_t fd;
  45     uint32_t model;
  46 } KVMOpenPICState;
  47
  48 static void kvm_openpic_set_irq(void *opaque, int n_IRQ, int level)
  49 {
  50     kvm_set_irq(kvm_state, n_IRQ, level);
  51 }
  52
  53 static void kvm_openpic_reset(DeviceState *d)
  54 {
  55     qemu_log_mask(LOG_UNIMP, "%s: unimplemented\n", __func__);
  56 }
  57
  58 static void kvm_openpic_write(void *opaque, hwaddr addr, uint64_t val,
  59                               unsigned size)
  60 {
  61     KVMOpenPICState *opp = opaque;
  62     struct kvm_device_attr attr;
  63     uint32_t val32 = val;
  64     int ret;
  65
  66     attr.group = KVM_DEV_MPIC_GRP_REGISTER;
  67     attr.attr = addr;
  68     attr.addr = (uint64_t)(unsigned long)&val32;
  69
  70     ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr);
  71     if (ret < 0) {
  72         qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__,
  73                       strerror(errno), attr.attr);
  74     }
  75 }
  76
  77 static uint64_t kvm_openpic_read(void *opaque, hwaddr addr, unsigned size)
  78 {
  79     KVMOpenPICState *opp = opaque;
  80     struct kvm_device_attr attr;
  81     uint32_t val = 0xdeadbeef;
  82     int ret;
  83
  84     attr.group = KVM_DEV_MPIC_GRP_REGISTER;
  85     attr.attr = addr;
  86     attr.addr = (uint64_t)(unsigned long)&val;
  87
  88     ret = ioctl(opp->fd, KVM_GET_DEVICE_ATTR, &attr);
  89     if (ret < 0) {
  90         qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__,
  91                       strerror(errno), attr.attr);
  92         return 0;
  93     }
  94
  95     return val;
  96 }
  97
  98 static const MemoryRegionOps kvm_openpic_mem_ops = {
  99     .write = kvm_openpic_write,
 100     .read  = kvm_openpic_read,
 101     .endianness = DEVICE_BIG_ENDIAN,
 102     .impl = {
 103         .min_access_size = 4,
 104         .max_access_size = 4,
 105     },
 106 };
 107
 108 static void kvm_openpic_region_add(MemoryListener *listener,
 109                                    MemoryRegionSection *section)
 110 {
 111     KVMOpenPICState *opp = container_of(listener, KVMOpenPICState,
 112                                         mem_listener);
 113     struct kvm_device_attr attr;
 114     uint64_t reg_base;
 115     int ret;
 116
 117     if (section->address_space != &address_space_memory) {
 118         abort();
 119     }
 120
 121     /* Ignore events on regions that are not us */
 122     if (section->mr != &opp->mem) {
 123         return;
 124     }
 125
 126     reg_base = section->offset_within_address_space;
 127
 128     attr.group = KVM_DEV_MPIC_GRP_MISC;
 129     attr.attr = KVM_DEV_MPIC_BASE_ADDR;
 130     attr.addr = (uint64_t)(unsigned long)&reg_base;
 131
 132     ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr);
 133     if (ret < 0) {
 134         fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__,
 135                 strerror(errno), reg_base);
 136     }
 137 }
 138
 139 static void kvm_openpic_region_del(MemoryListener *listener,
 140                                    MemoryRegionSection *section)
 141 {
 142     KVMOpenPICState *opp = container_of(listener, KVMOpenPICState,
 143                                         mem_listener);
 144     struct kvm_device_attr attr;
 145     uint64_t reg_base = 0;
 146     int ret;
 147
 148     /* Ignore events on regions that are not us */
 149     if (section->mr != &opp->mem) {
 150         return;
 151     }
 152
 153     attr.group = KVM_DEV_MPIC_GRP_MISC;
 154     attr.attr = KVM_DEV_MPIC_BASE_ADDR;
 155     attr.addr = (uint64_t)(unsigned long)&reg_base;
 156
 157     ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr);
 158     if (ret < 0) {
 159         fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__,
 160                 strerror(errno), reg_base);
 161     }
 162 }
 163
 164 static void kvm_openpic_init(Object *obj)
 165 {
 166     KVMOpenPICState *opp = KVM_OPENPIC(obj);
 167
 168     memory_region_init_io(&opp->mem, OBJECT(opp), &kvm_openpic_mem_ops, opp,
 169                           "kvm-openpic", 0x40000);
 170 }
 171
 172 static void kvm_openpic_realize(DeviceState *dev, Error **errp)
 173 {
 174     SysBusDevice *d = SYS_BUS_DEVICE(dev);
 175     KVMOpenPICState *opp = KVM_OPENPIC(dev);
 176     KVMState *s = kvm_state;
 177     int kvm_openpic_model;
 178     struct kvm_create_device cd = {0};
 179     int ret, i;
 180
 181     if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) {
 182         error_setg(errp, "Kernel is lacking Device Control API");
 183         return;
 184     }
 185
 186     switch (opp->model) {
 187     case OPENPIC_MODEL_FSL_MPIC_20:
 188         kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_20;
 189         break;
 190
 191     case OPENPIC_MODEL_FSL_MPIC_42:
 192         kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_42;
 193         break;
 194
 195     default:
 196         error_setg(errp, "Unsupported OpenPIC model %" PRIu32, opp->model);
 197         return;
 198     }
 199
 200     cd.type = kvm_openpic_model;
 201     ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &cd);
 202     if (ret < 0) {
 203         error_setg(errp, "Can't create device %d: %s",
 204                    cd.type, strerror(errno));
 205         return;
 206     }
 207     opp->fd = cd.fd;
 208
 209     sysbus_init_mmio(d, &opp->mem);
 210     qdev_init_gpio_in(dev, kvm_openpic_set_irq, OPENPIC_MAX_IRQ);
 211
 212     opp->mem_listener.region_add = kvm_openpic_region_add;
 213     opp->mem_listener.region_del = kvm_openpic_region_del;
 214     memory_listener_register(&opp->mem_listener, &address_space_memory);
 215
 216     /* indicate pic capabilities */
 217     msi_supported = true;
 218     kvm_kernel_irqchip = true;
 219     kvm_async_interrupts_allowed = true;
 220
 221     /* set up irq routing */
 222     kvm_init_irq_routing(kvm_state);
 223     for (i = 0; i < 256; ++i) {
 224         kvm_irqchip_add_irq_route(kvm_state, i, 0, i);
 225     }
 226
 227     kvm_irqfds_allowed = true;
 228     kvm_msi_via_irqfd_allowed = true;
 229     kvm_gsi_routing_allowed = true;
 230
 231     kvm_irqchip_commit_routes(s);
 232 }
 233
 234 int kvm_openpic_connect_vcpu(DeviceState *d, CPUState *cs)
 235 {
 236     KVMOpenPICState *opp = KVM_OPENPIC(d);
 237     struct kvm_enable_cap encap = {};
 238
 239     encap.cap = KVM_CAP_IRQ_MPIC;
 240     encap.args[0] = opp->fd;
 241     encap.args[1] = kvm_arch_vcpu_id(cs);
 242
 243     return kvm_vcpu_ioctl(cs, KVM_ENABLE_CAP, &encap);
 244 }
 245
 246 static Property kvm_openpic_properties[] = {
 247     DEFINE_PROP_UINT32("model", KVMOpenPICState, model,
 248                        OPENPIC_MODEL_FSL_MPIC_20),
 249     DEFINE_PROP_END_OF_LIST(),
 250 };
 251
 252 static void kvm_openpic_class_init(ObjectClass *oc, void *data)
 253 {
 254     DeviceClass *dc = DEVICE_CLASS(oc);
 255
 256     dc->realize = kvm_openpic_realize;
 257     dc->props = kvm_openpic_properties;
 258     dc->reset = kvm_openpic_reset;
 259 }
 260
 261 static const TypeInfo kvm_openpic_info = {
 262     .name          = TYPE_KVM_OPENPIC,
 263     .parent        = TYPE_SYS_BUS_DEVICE,
 264     .instance_size = sizeof(KVMOpenPICState),
 265     .instance_init = kvm_openpic_init,
 266     .class_init    = kvm_openpic_class_init,
 267 };
 268
 269 static void kvm_openpic_register_types(void)
 270 {
 271     type_register_static(&kvm_openpic_info);
 272 }
 273
 274 type_init(kvm_openpic_register_types)