hw/ppc/pnv_core.c

   1 /*
   2  * QEMU PowerPC PowerNV CPU Core model
   3  *
   4  * Copyright (c) 2016, IBM Corporation.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public License
   8  * as published by the Free Software Foundation; either version 2 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "qemu/osdep.h"
  20 #include "sysemu/sysemu.h"
  21 #include "qapi/error.h"
  22 #include "qemu/log.h"
  23 #include "target/ppc/cpu.h"
  24 #include "hw/ppc/ppc.h"
  25 #include "hw/ppc/pnv.h"
  26 #include "hw/ppc/pnv_core.h"
  27 #include "hw/ppc/pnv_xscom.h"
  28 #include "hw/ppc/xics.h"
  29
  30 static const char *pnv_core_cpu_typename(PnvCore *pc)
  31 {
  32     const char *core_type = object_class_get_name(object_get_class(OBJECT(pc)));
  33     int len = strlen(core_type) - strlen(PNV_CORE_TYPE_SUFFIX);
  34     char *s = g_strdup_printf(POWERPC_CPU_TYPE_NAME("%.*s"), len, core_type);
  35     const char *cpu_type = object_class_get_name(object_class_by_name(s));
  36     g_free(s);
  37     return cpu_type;
  38 }
  39
  40 static void pnv_cpu_reset(void *opaque)
  41 {
  42     PowerPCCPU *cpu = opaque;
  43     CPUState *cs = CPU(cpu);
  44     CPUPPCState *env = &cpu->env;
  45
  46     cpu_reset(cs);
  47
  48     /*
  49      * the skiboot firmware elects a primary thread to initialize the
  50      * system and it can be any.
  51      */
  52     env->gpr[3] = PNV_FDT_ADDR;
  53     env->nip = 0x10;
  54     env->msr |= MSR_HVB; /* Hypervisor mode */
  55 }
  56
  57 /*
  58  * These values are read by the PowerNV HW monitors under Linux
  59  */
  60 #define PNV_XSCOM_EX_DTS_RESULT0     0x50000
  61 #define PNV_XSCOM_EX_DTS_RESULT1     0x50001
  62
  63 static uint64_t pnv_core_xscom_read(void *opaque, hwaddr addr,
  64                                     unsigned int width)
  65 {
  66     uint32_t offset = addr >> 3;
  67     uint64_t val = 0;
  68
  69     /* The result should be 38 C */
  70     switch (offset) {
  71     case PNV_XSCOM_EX_DTS_RESULT0:
  72         val = 0x26f024f023f0000ull;
  73         break;
  74     case PNV_XSCOM_EX_DTS_RESULT1:
  75         val = 0x24f000000000000ull;
  76         break;
  77     default:
  78         qemu_log_mask(LOG_UNIMP, "Warning: reading reg=0x%" HWADDR_PRIx "\n",
  79                   addr);
  80     }
  81
  82     return val;
  83 }
  84
  85 static void pnv_core_xscom_write(void *opaque, hwaddr addr, uint64_t val,
  86                                  unsigned int width)
  87 {
  88     qemu_log_mask(LOG_UNIMP, "Warning: writing to reg=0x%" HWADDR_PRIx "\n",
  89                   addr);
  90 }
  91
  92 static const MemoryRegionOps pnv_core_xscom_ops = {
  93     .read = pnv_core_xscom_read,
  94     .write = pnv_core_xscom_write,
  95     .valid.min_access_size = 8,
  96     .valid.max_access_size = 8,
  97     .impl.min_access_size = 8,
  98     .impl.max_access_size = 8,
  99     .endianness = DEVICE_BIG_ENDIAN,
 100 };
 101
 102 static void pnv_realize_vcpu(PowerPCCPU *cpu, XICSFabric *xi, Error **errp)
 103 {
 104     CPUPPCState *env = &cpu->env;
 105     int core_pir;
 106     int thread_index = 0; /* TODO: TCG supports only one thread */
 107     ppc_spr_t *pir = &env->spr_cb[SPR_PIR];
 108     Error *local_err = NULL;
 109
 110     object_property_set_bool(OBJECT(cpu), true, "realized", &local_err);
 111     if (local_err) {
 112         error_propagate(errp, local_err);
 113         return;
 114     }
 115
 116     cpu->intc = icp_create(OBJECT(cpu), TYPE_PNV_ICP, xi, &local_err);
 117     if (local_err) {
 118         error_propagate(errp, local_err);
 119         return;
 120     }
 121
 122     core_pir = object_property_get_uint(OBJECT(cpu), "core-pir", &error_abort);
 123
 124     /*
 125      * The PIR of a thread is the core PIR + the thread index. We will
 126      * need to find a way to get the thread index when TCG supports
 127      * more than 1. We could use the object name ?
 128      */
 129     pir->default_value = core_pir + thread_index;
 130
 131     /* Set time-base frequency to 512 MHz */
 132     cpu_ppc_tb_init(env, PNV_TIMEBASE_FREQ);
 133
 134     qemu_register_reset(pnv_cpu_reset, cpu);
 135 }
 136
 137 static void pnv_core_realize(DeviceState *dev, Error **errp)
 138 {
 139     PnvCore *pc = PNV_CORE(OBJECT(dev));
 140     CPUCore *cc = CPU_CORE(OBJECT(dev));
 141     const char *typename = pnv_core_cpu_typename(pc);
 142     Error *local_err = NULL;
 143     void *obj;
 144     int i, j;
 145     char name[32];
 146     Object *xi;
 147
 148     xi = object_property_get_link(OBJECT(dev), "xics", &local_err);
 149     if (!xi) {
 150         error_setg(errp, "%s: required link 'xics' not found: %s",
 151                    __func__, error_get_pretty(local_err));
 152         return;
 153     }
 154
 155     pc->threads = g_new(PowerPCCPU *, cc->nr_threads);
 156     for (i = 0; i < cc->nr_threads; i++) {
 157         obj = object_new(typename);
 158
 159         pc->threads[i] = POWERPC_CPU(obj);
 160
 161         snprintf(name, sizeof(name), "thread[%d]", i);
 162         object_property_add_child(OBJECT(pc), name, obj, &error_abort);
 163         object_property_add_alias(obj, "core-pir", OBJECT(pc),
 164                                   "pir", &error_abort);
 165         object_unref(obj);
 166     }
 167
 168     for (j = 0; j < cc->nr_threads; j++) {
 169         pnv_realize_vcpu(pc->threads[j], XICS_FABRIC(xi), &local_err);
 170         if (local_err) {
 171             goto err;
 172         }
 173     }
 174
 175     snprintf(name, sizeof(name), "xscom-core.%d", cc->core_id);
 176     pnv_xscom_region_init(&pc->xscom_regs, OBJECT(dev), &pnv_core_xscom_ops,
 177                           pc, name, PNV_XSCOM_EX_SIZE);
 178     return;
 179
 180 err:
 181     while (--i >= 0) {
 182         obj = OBJECT(pc->threads[i]);
 183         object_unparent(obj);
 184     }
 185     g_free(pc->threads);
 186     error_propagate(errp, local_err);
 187 }
 188
 189 static void pnv_unrealize_vcpu(PowerPCCPU *cpu)
 190 {
 191     qemu_unregister_reset(pnv_cpu_reset, cpu);
 192     object_unparent(cpu->intc);
 193     cpu_remove_sync(CPU(cpu));
 194     object_unparent(OBJECT(cpu));
 195 }
 196
 197 static void pnv_core_unrealize(DeviceState *dev, Error **errp)
 198 {
 199     PnvCore *pc = PNV_CORE(dev);
 200     CPUCore *cc = CPU_CORE(dev);
 201     int i;
 202
 203     for (i = 0; i < cc->nr_threads; i++) {
 204         pnv_unrealize_vcpu(pc->threads[i]);
 205     }
 206     g_free(pc->threads);
 207 }
 208
 209 static Property pnv_core_properties[] = {
 210     DEFINE_PROP_UINT32("pir", PnvCore, pir, 0),
 211     DEFINE_PROP_END_OF_LIST(),
 212 };
 213
 214 static void pnv_core_class_init(ObjectClass *oc, void *data)
 215 {
 216     DeviceClass *dc = DEVICE_CLASS(oc);
 217
 218     dc->realize = pnv_core_realize;
 219     dc->unrealize = pnv_core_unrealize;
 220     dc->props = pnv_core_properties;
 221 }
 222
 223 #define DEFINE_PNV_CORE_TYPE(cpu_model)         \
 224     {                                           \
 225         .parent = TYPE_PNV_CORE,                \
 226         .name = PNV_CORE_TYPE_NAME(cpu_model),  \
 227     }
 228
 229 static const TypeInfo pnv_core_infos[] = {
 230     {
 231         .name           = TYPE_PNV_CORE,
 232         .parent         = TYPE_CPU_CORE,
 233         .instance_size  = sizeof(PnvCore),
 234         .class_size     = sizeof(PnvCoreClass),
 235         .class_init = pnv_core_class_init,
 236         .abstract       = true,
 237     },
 238     DEFINE_PNV_CORE_TYPE("power8e_v2.1"),
 239     DEFINE_PNV_CORE_TYPE("power8_v2.0"),
 240     DEFINE_PNV_CORE_TYPE("power8nvl_v1.0"),
 241     DEFINE_PNV_CORE_TYPE("power9_v2.0"),
 242 };
 243
 244 DEFINE_TYPES(pnv_core_infos)