xref: /openbmc/qemu/hw/ppc/pnv_core.c (revision 438c78da)
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, PnvChip *chip, 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     PnvChipClass *pcc = PNV_CHIP_GET_CLASS(chip);
110 
111     object_property_set_bool(OBJECT(cpu), true, "realized", &local_err);
112     if (local_err) {
113         error_propagate(errp, local_err);
114         return;
115     }
116 
117     cpu->intc = pcc->intc_create(chip, OBJECT(cpu), &local_err);
118     if (local_err) {
119         error_propagate(errp, local_err);
120         return;
121     }
122 
123     core_pir = object_property_get_uint(OBJECT(cpu), "core-pir", &error_abort);
124 
125     /*
126      * The PIR of a thread is the core PIR + the thread index. We will
127      * need to find a way to get the thread index when TCG supports
128      * more than 1. We could use the object name ?
129      */
130     pir->default_value = core_pir + thread_index;
131 
132     /* Set time-base frequency to 512 MHz */
133     cpu_ppc_tb_init(env, PNV_TIMEBASE_FREQ);
134 
135     qemu_register_reset(pnv_cpu_reset, cpu);
136 }
137 
138 static void pnv_core_realize(DeviceState *dev, Error **errp)
139 {
140     PnvCore *pc = PNV_CORE(OBJECT(dev));
141     CPUCore *cc = CPU_CORE(OBJECT(dev));
142     const char *typename = pnv_core_cpu_typename(pc);
143     Error *local_err = NULL;
144     void *obj;
145     int i, j;
146     char name[32];
147     Object *chip;
148 
149     chip = object_property_get_link(OBJECT(dev), "chip", &local_err);
150     if (!chip) {
151         error_propagate_prepend(errp, local_err,
152                                 "required link 'chip' not found: ");
153         return;
154     }
155 
156     pc->threads = g_new(PowerPCCPU *, cc->nr_threads);
157     for (i = 0; i < cc->nr_threads; i++) {
158         obj = object_new(typename);
159 
160         pc->threads[i] = POWERPC_CPU(obj);
161 
162         snprintf(name, sizeof(name), "thread[%d]", i);
163         object_property_add_child(OBJECT(pc), name, obj, &error_abort);
164         object_property_add_alias(obj, "core-pir", OBJECT(pc),
165                                   "pir", &error_abort);
166         object_unref(obj);
167     }
168 
169     for (j = 0; j < cc->nr_threads; j++) {
170         pnv_realize_vcpu(pc->threads[j], PNV_CHIP(chip), &local_err);
171         if (local_err) {
172             goto err;
173         }
174     }
175 
176     snprintf(name, sizeof(name), "xscom-core.%d", cc->core_id);
177     pnv_xscom_region_init(&pc->xscom_regs, OBJECT(dev), &pnv_core_xscom_ops,
178                           pc, name, PNV_XSCOM_EX_SIZE);
179     return;
180 
181 err:
182     while (--i >= 0) {
183         obj = OBJECT(pc->threads[i]);
184         object_unparent(obj);
185     }
186     g_free(pc->threads);
187     error_propagate(errp, local_err);
188 }
189 
190 static void pnv_unrealize_vcpu(PowerPCCPU *cpu)
191 {
192     qemu_unregister_reset(pnv_cpu_reset, cpu);
193     object_unparent(cpu->intc);
194     cpu_remove_sync(CPU(cpu));
195     object_unparent(OBJECT(cpu));
196 }
197 
198 static void pnv_core_unrealize(DeviceState *dev, Error **errp)
199 {
200     PnvCore *pc = PNV_CORE(dev);
201     CPUCore *cc = CPU_CORE(dev);
202     int i;
203 
204     for (i = 0; i < cc->nr_threads; i++) {
205         pnv_unrealize_vcpu(pc->threads[i]);
206     }
207     g_free(pc->threads);
208 }
209 
210 static Property pnv_core_properties[] = {
211     DEFINE_PROP_UINT32("pir", PnvCore, pir, 0),
212     DEFINE_PROP_END_OF_LIST(),
213 };
214 
215 static void pnv_core_class_init(ObjectClass *oc, void *data)
216 {
217     DeviceClass *dc = DEVICE_CLASS(oc);
218 
219     dc->realize = pnv_core_realize;
220     dc->unrealize = pnv_core_unrealize;
221     dc->props = pnv_core_properties;
222 }
223 
224 #define DEFINE_PNV_CORE_TYPE(cpu_model)         \
225     {                                           \
226         .parent = TYPE_PNV_CORE,                \
227         .name = PNV_CORE_TYPE_NAME(cpu_model),  \
228     }
229 
230 static const TypeInfo pnv_core_infos[] = {
231     {
232         .name           = TYPE_PNV_CORE,
233         .parent         = TYPE_CPU_CORE,
234         .instance_size  = sizeof(PnvCore),
235         .class_size     = sizeof(PnvCoreClass),
236         .class_init = pnv_core_class_init,
237         .abstract       = true,
238     },
239     DEFINE_PNV_CORE_TYPE("power8e_v2.1"),
240     DEFINE_PNV_CORE_TYPE("power8_v2.0"),
241     DEFINE_PNV_CORE_TYPE("power8nvl_v1.0"),
242     DEFINE_PNV_CORE_TYPE("power9_v2.0"),
243 };
244 
245 DEFINE_TYPES(pnv_core_infos)
246