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     reg_base = section->offset_within_address_space;
 122
 123     attr.group = KVM_DEV_MPIC_GRP_MISC;
 124     attr.attr = KVM_DEV_MPIC_BASE_ADDR;
 125     attr.addr = (uint64_t)(unsigned long)&reg_base;
 126
 127     ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr);
 128     if (ret < 0) {
 129         fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__,
 130                 strerror(errno), reg_base);
 131     }
 132 }
 133
 134 static void kvm_openpic_region_del(MemoryListener *listener,
 135                                    MemoryRegionSection *section)
 136 {
 137     KVMOpenPICState *opp = container_of(listener, KVMOpenPICState,
 138                                         mem_listener);
 139     struct kvm_device_attr attr;
 140     uint64_t reg_base = 0;
 141     int ret;
 142
 143     attr.group = KVM_DEV_MPIC_GRP_MISC;
 144     attr.attr = KVM_DEV_MPIC_BASE_ADDR;
 145     attr.addr = (uint64_t)(unsigned long)&reg_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_init(Object *obj)
 155 {
 156     KVMOpenPICState *opp = KVM_OPENPIC(obj);
 157
 158     memory_region_init_io(&opp->mem, &kvm_openpic_mem_ops, opp,
 159                           "kvm-openpic", 0x40000);
 160 }
 161
 162 static void kvm_openpic_realize(DeviceState *dev, Error **errp)
 163 {
 164     SysBusDevice *d = SYS_BUS_DEVICE(dev);
 165     KVMOpenPICState *opp = KVM_OPENPIC(dev);
 166     KVMState *s = kvm_state;
 167     int kvm_openpic_model;
 168     struct kvm_create_device cd = {0};
 169     int ret, i;
 170
 171     if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) {
 172         error_setg(errp, "Kernel is lacking Device Control API");
 173         return;
 174     }
 175
 176     switch (opp->model) {
 177     case OPENPIC_MODEL_FSL_MPIC_20:
 178         kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_20;
 179         break;
 180
 181     case OPENPIC_MODEL_FSL_MPIC_42:
 182         kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_42;
 183         break;
 184
 185     default:
 186         error_setg(errp, "Unsupported OpenPIC model %" PRIu32, opp->model);
 187         return;
 188     }
 189
 190     cd.type = kvm_openpic_model;
 191     ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &cd);
 192     if (ret < 0) {
 193         error_setg(errp, "Can't create device %d: %s",
 194                    cd.type, strerror(errno));
 195         return;
 196     }
 197     opp->fd = cd.fd;
 198
 199     sysbus_init_mmio(d, &opp->mem);
 200     qdev_init_gpio_in(dev, kvm_openpic_set_irq, OPENPIC_MAX_IRQ);
 201
 202     opp->mem_listener.region_add = kvm_openpic_region_add;
 203     opp->mem_listener.region_add = kvm_openpic_region_del;
 204     memory_listener_register(&opp->mem_listener, &address_space_memory);
 205
 206     /* indicate pic capabilities */
 207     msi_supported = true;
 208     kvm_kernel_irqchip = true;
 209     kvm_async_interrupts_allowed = true;
 210
 211     /* set up irq routing */
 212     kvm_init_irq_routing(kvm_state);
 213     for (i = 0; i < 256; ++i) {
 214         kvm_irqchip_add_irq_route(kvm_state, i, 0, i);
 215     }
 216
 217     kvm_irqfds_allowed = true;
 218     kvm_msi_via_irqfd_allowed = true;
 219     kvm_gsi_routing_allowed = true;
 220
 221     kvm_irqchip_commit_routes(s);
 222 }
 223
 224 int kvm_openpic_connect_vcpu(DeviceState *d, CPUState *cs)
 225 {
 226     KVMOpenPICState *opp = KVM_OPENPIC(d);
 227     struct kvm_enable_cap encap = {};
 228
 229     encap.cap = KVM_CAP_IRQ_MPIC;
 230     encap.args[0] = opp->fd;
 231     encap.args[1] = cs->cpu_index;
 232
 233     return kvm_vcpu_ioctl(cs, KVM_ENABLE_CAP, &encap);
 234 }
 235
 236 static Property kvm_openpic_properties[] = {
 237     DEFINE_PROP_UINT32("model", KVMOpenPICState, model,
 238                        OPENPIC_MODEL_FSL_MPIC_20),
 239     DEFINE_PROP_END_OF_LIST(),
 240 };
 241
 242 static void kvm_openpic_class_init(ObjectClass *oc, void *data)
 243 {
 244     DeviceClass *dc = DEVICE_CLASS(oc);
 245
 246     dc->realize = kvm_openpic_realize;
 247     dc->props = kvm_openpic_properties;
 248     dc->reset = kvm_openpic_reset;
 249 }
 250
 251 static const TypeInfo kvm_openpic_info = {
 252     .name          = TYPE_KVM_OPENPIC,
 253     .parent        = TYPE_SYS_BUS_DEVICE,
 254     .instance_size = sizeof(KVMOpenPICState),
 255     .instance_init = kvm_openpic_init,
 256     .class_init    = kvm_openpic_class_init,
 257 };
 258
 259 static void kvm_openpic_register_types(void)
 260 {
 261     type_register_static(&kvm_openpic_info);
 262 }
 263
 264 type_init(kvm_openpic_register_types)