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