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 static void pnv_cpu_init(PowerPCCPU *cpu, Error **errp)
  58 {
  59     CPUPPCState *env = &cpu->env;
  60     int core_pir;
  61     int thread_index = 0; /* TODO: TCG supports only one thread */
  62     ppc_spr_t *pir = &env->spr_cb[SPR_PIR];
  63
  64     core_pir = object_property_get_uint(OBJECT(cpu), "core-pir", &error_abort);
  65
  66     /*
  67      * The PIR of a thread is the core PIR + the thread index. We will
  68      * need to find a way to get the thread index when TCG supports
  69      * more than 1. We could use the object name ?
  70      */
  71     pir->default_value = core_pir + thread_index;
  72
  73     /* Set time-base frequency to 512 MHz */
  74     cpu_ppc_tb_init(env, PNV_TIMEBASE_FREQ);
  75
  76     qemu_register_reset(pnv_cpu_reset, cpu);
  77 }
  78
  79 /*
  80  * These values are read by the PowerNV HW monitors under Linux
  81  */
  82 #define PNV_XSCOM_EX_DTS_RESULT0     0x50000
  83 #define PNV_XSCOM_EX_DTS_RESULT1     0x50001
  84
  85 static uint64_t pnv_core_xscom_read(void *opaque, hwaddr addr,
  86                                     unsigned int width)
  87 {
  88     uint32_t offset = addr >> 3;
  89     uint64_t val = 0;
  90
  91     /* The result should be 38 C */
  92     switch (offset) {
  93     case PNV_XSCOM_EX_DTS_RESULT0:
  94         val = 0x26f024f023f0000ull;
  95         break;
  96     case PNV_XSCOM_EX_DTS_RESULT1:
  97         val = 0x24f000000000000ull;
  98         break;
  99     default:
 100         qemu_log_mask(LOG_UNIMP, "Warning: reading reg=0x%" HWADDR_PRIx,
 101                   addr);
 102     }
 103
 104     return val;
 105 }
 106
 107 static void pnv_core_xscom_write(void *opaque, hwaddr addr, uint64_t val,
 108                                  unsigned int width)
 109 {
 110     qemu_log_mask(LOG_UNIMP, "Warning: writing to reg=0x%" HWADDR_PRIx,
 111                   addr);
 112 }
 113
 114 static const MemoryRegionOps pnv_core_xscom_ops = {
 115     .read = pnv_core_xscom_read,
 116     .write = pnv_core_xscom_write,
 117     .valid.min_access_size = 8,
 118     .valid.max_access_size = 8,
 119     .impl.min_access_size = 8,
 120     .impl.max_access_size = 8,
 121     .endianness = DEVICE_BIG_ENDIAN,
 122 };
 123
 124 static void pnv_core_realize_child(Object *child, XICSFabric *xi, Error **errp)
 125 {
 126     Error *local_err = NULL;
 127     CPUState *cs = CPU(child);
 128     PowerPCCPU *cpu = POWERPC_CPU(cs);
 129
 130     object_property_set_bool(child, true, "realized", &local_err);
 131     if (local_err) {
 132         error_propagate(errp, local_err);
 133         return;
 134     }
 135
 136     cpu->intc = icp_create(child, TYPE_PNV_ICP, xi, &local_err);
 137     if (local_err) {
 138         error_propagate(errp, local_err);
 139         return;
 140     }
 141
 142     pnv_cpu_init(cpu, &local_err);
 143     if (local_err) {
 144         error_propagate(errp, local_err);
 145         return;
 146     }
 147 }
 148
 149 static void pnv_core_realize(DeviceState *dev, Error **errp)
 150 {
 151     PnvCore *pc = PNV_CORE(OBJECT(dev));
 152     CPUCore *cc = CPU_CORE(OBJECT(dev));
 153     const char *typename = pnv_core_cpu_typename(pc);
 154     size_t size = object_type_get_instance_size(typename);
 155     Error *local_err = NULL;
 156     void *obj;
 157     int i, j;
 158     char name[32];
 159     Object *xi;
 160
 161     xi = object_property_get_link(OBJECT(dev), "xics", &local_err);
 162     if (!xi) {
 163         error_setg(errp, "%s: required link 'xics' not found: %s",
 164                    __func__, error_get_pretty(local_err));
 165         return;
 166     }
 167
 168     pc->threads = g_malloc0(size * cc->nr_threads);
 169     for (i = 0; i < cc->nr_threads; i++) {
 170         obj = pc->threads + i * size;
 171
 172         object_initialize(obj, size, typename);
 173
 174         snprintf(name, sizeof(name), "thread[%d]", i);
 175         object_property_add_child(OBJECT(pc), name, obj, &local_err);
 176         object_property_add_alias(obj, "core-pir", OBJECT(pc),
 177                                   "pir", &local_err);
 178         if (local_err) {
 179             goto err;
 180         }
 181         object_unref(obj);
 182     }
 183
 184     for (j = 0; j < cc->nr_threads; j++) {
 185         obj = pc->threads + j * size;
 186
 187         pnv_core_realize_child(obj, XICS_FABRIC(xi), &local_err);
 188         if (local_err) {
 189             goto err;
 190         }
 191     }
 192
 193     snprintf(name, sizeof(name), "xscom-core.%d", cc->core_id);
 194     pnv_xscom_region_init(&pc->xscom_regs, OBJECT(dev), &pnv_core_xscom_ops,
 195                           pc, name, PNV_XSCOM_EX_SIZE);
 196     return;
 197
 198 err:
 199     while (--i >= 0) {
 200         obj = pc->threads + i * size;
 201         object_unparent(obj);
 202     }
 203     g_free(pc->threads);
 204     error_propagate(errp, local_err);
 205 }
 206
 207 static Property pnv_core_properties[] = {
 208     DEFINE_PROP_UINT32("pir", PnvCore, pir, 0),
 209     DEFINE_PROP_END_OF_LIST(),
 210 };
 211
 212 static void pnv_core_class_init(ObjectClass *oc, void *data)
 213 {
 214     DeviceClass *dc = DEVICE_CLASS(oc);
 215
 216     dc->realize = pnv_core_realize;
 217     dc->props = pnv_core_properties;
 218 }
 219
 220 #define DEFINE_PNV_CORE_TYPE(cpu_model)         \
 221     {                                           \
 222         .parent = TYPE_PNV_CORE,                \
 223         .name = PNV_CORE_TYPE_NAME(cpu_model),  \
 224     }
 225
 226 static const TypeInfo pnv_core_infos[] = {
 227     {
 228         .name           = TYPE_PNV_CORE,
 229         .parent         = TYPE_CPU_CORE,
 230         .instance_size  = sizeof(PnvCore),
 231         .class_size     = sizeof(PnvCoreClass),
 232         .class_init = pnv_core_class_init,
 233         .abstract       = true,
 234     },
 235     DEFINE_PNV_CORE_TYPE("power8e_v2.1"),
 236     DEFINE_PNV_CORE_TYPE("power8_v2.0"),
 237     DEFINE_PNV_CORE_TYPE("power8nvl_v1.0"),
 238     DEFINE_PNV_CORE_TYPE("power9_v2.0"),
 239 };
 240
 241 DEFINE_TYPES(pnv_core_infos)