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