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 "qemu-common.h"
  28 #include "cpu.h"
  29 #include <sys/ioctl.h>
  30 #include "exec/address-spaces.h"
  31 #include "hw/hw.h"
  32 #include "hw/ppc/openpic.h"
  33 #include "hw/ppc/openpic_kvm.h"
  34 #include "hw/pci/msi.h"
  35 #include "hw/sysbus.h"
  36 #include "sysemu/kvm.h"
  37 #include "qemu/log.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     if (section->fv != address_space_to_flatview(&address_space_memory)) {
 129         abort();
 130     }
 131
 132     /* Ignore events on regions that are not us */
 133     if (section->mr != &opp->mem) {
 134         return;
 135     }
 136
 137     if (opp->mapped) {
 138         /*
 139          * We can only map the MPIC once. Since we are already mapped,
 140          * the best we can do is ignore new maps.
 141          */
 142         return;
 143     }
 144
 145     reg_base = section->offset_within_address_space;
 146     opp->mapped = reg_base;
 147
 148     attr.group = KVM_DEV_MPIC_GRP_MISC;
 149     attr.attr = KVM_DEV_MPIC_BASE_ADDR;
 150     attr.addr = (uint64_t)(unsigned long)&reg_base;
 151
 152     ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr);
 153     if (ret < 0) {
 154         fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__,
 155                 strerror(errno), reg_base);
 156     }
 157 }
 158
 159 static void kvm_openpic_region_del(MemoryListener *listener,
 160                                    MemoryRegionSection *section)
 161 {
 162     KVMOpenPICState *opp = container_of(listener, KVMOpenPICState,
 163                                         mem_listener);
 164     struct kvm_device_attr attr;
 165     uint64_t reg_base = 0;
 166     int ret;
 167
 168     /* Ignore events on regions that are not us */
 169     if (section->mr != &opp->mem) {
 170         return;
 171     }
 172
 173     if (section->offset_within_address_space != opp->mapped) {
 174         /*
 175          * We can only map the MPIC once. This mapping was a secondary
 176          * one that we couldn't fulfill. Ignore it.
 177          */
 178         return;
 179     }
 180     opp->mapped = 0;
 181
 182     attr.group = KVM_DEV_MPIC_GRP_MISC;
 183     attr.attr = KVM_DEV_MPIC_BASE_ADDR;
 184     attr.addr = (uint64_t)(unsigned long)&reg_base;
 185
 186     ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr);
 187     if (ret < 0) {
 188         fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__,
 189                 strerror(errno), reg_base);
 190     }
 191 }
 192
 193 static void kvm_openpic_init(Object *obj)
 194 {
 195     KVMOpenPICState *opp = KVM_OPENPIC(obj);
 196
 197     memory_region_init_io(&opp->mem, OBJECT(opp), &kvm_openpic_mem_ops, opp,
 198                           "kvm-openpic", 0x40000);
 199 }
 200
 201 static void kvm_openpic_realize(DeviceState *dev, Error **errp)
 202 {
 203     SysBusDevice *d = SYS_BUS_DEVICE(dev);
 204     KVMOpenPICState *opp = KVM_OPENPIC(dev);
 205     KVMState *s = kvm_state;
 206     int kvm_openpic_model;
 207     struct kvm_create_device cd = {0};
 208     int ret, i;
 209
 210     if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) {
 211         error_setg(errp, "Kernel is lacking Device Control API");
 212         return;
 213     }
 214
 215     switch (opp->model) {
 216     case OPENPIC_MODEL_FSL_MPIC_20:
 217         kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_20;
 218         break;
 219
 220     case OPENPIC_MODEL_FSL_MPIC_42:
 221         kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_42;
 222         break;
 223
 224     default:
 225         error_setg(errp, "Unsupported OpenPIC model %" PRIu32, opp->model);
 226         return;
 227     }
 228
 229     cd.type = kvm_openpic_model;
 230     ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &cd);
 231     if (ret < 0) {
 232         error_setg(errp, "Can't create device %d: %s",
 233                    cd.type, strerror(errno));
 234         return;
 235     }
 236     opp->fd = cd.fd;
 237
 238     sysbus_init_mmio(d, &opp->mem);
 239     qdev_init_gpio_in(dev, kvm_openpic_set_irq, OPENPIC_MAX_IRQ);
 240
 241     opp->mem_listener.region_add = kvm_openpic_region_add;
 242     opp->mem_listener.region_del = kvm_openpic_region_del;
 243     memory_listener_register(&opp->mem_listener, &address_space_memory);
 244
 245     /* indicate pic capabilities */
 246     msi_nonbroken = true;
 247     kvm_kernel_irqchip = true;
 248     kvm_async_interrupts_allowed = true;
 249
 250     /* set up irq routing */
 251     kvm_init_irq_routing(kvm_state);
 252     for (i = 0; i < 256; ++i) {
 253         kvm_irqchip_add_irq_route(kvm_state, i, 0, i);
 254     }
 255
 256     kvm_msi_via_irqfd_allowed = true;
 257     kvm_gsi_routing_allowed = true;
 258
 259     kvm_irqchip_commit_routes(s);
 260 }
 261
 262 int kvm_openpic_connect_vcpu(DeviceState *d, CPUState *cs)
 263 {
 264     KVMOpenPICState *opp = KVM_OPENPIC(d);
 265
 266     return kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_MPIC, 0, opp->fd,
 267                                kvm_arch_vcpu_id(cs));
 268 }
 269
 270 static Property kvm_openpic_properties[] = {
 271     DEFINE_PROP_UINT32("model", KVMOpenPICState, model,
 272                        OPENPIC_MODEL_FSL_MPIC_20),
 273     DEFINE_PROP_END_OF_LIST(),
 274 };
 275
 276 static void kvm_openpic_class_init(ObjectClass *oc, void *data)
 277 {
 278     DeviceClass *dc = DEVICE_CLASS(oc);
 279
 280     dc->realize = kvm_openpic_realize;
 281     dc->props = kvm_openpic_properties;
 282     dc->reset = kvm_openpic_reset;
 283     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 284 }
 285
 286 static const TypeInfo kvm_openpic_info = {
 287     .name          = TYPE_KVM_OPENPIC,
 288     .parent        = TYPE_SYS_BUS_DEVICE,
 289     .instance_size = sizeof(KVMOpenPICState),
 290     .instance_init = kvm_openpic_init,
 291     .class_init    = kvm_openpic_class_init,
 292 };
 293
 294 static void kvm_openpic_register_types(void)
 295 {
 296     type_register_static(&kvm_openpic_info);
 297 }
 298
 299 type_init(kvm_openpic_register_types)