hw/nvram/spapr_nvram.c

   1 /*
   2  * QEMU sPAPR NVRAM emulation
   3  *
   4  * Copyright (C) 2012 David Gibson, IBM Corporation.
   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 "qemu/module.h"
  27 #include "qemu/units.h"
  28 #include "qapi/error.h"
  29 #include "cpu.h"
  30 #include <libfdt.h>
  31
  32 #include "sysemu/block-backend.h"
  33 #include "sysemu/device_tree.h"
  34 #include "sysemu/sysemu.h"
  35 #include "sysemu/runstate.h"
  36 #include "hw/sysbus.h"
  37 #include "migration/vmstate.h"
  38 #include "hw/nvram/chrp_nvram.h"
  39 #include "hw/ppc/spapr.h"
  40 #include "hw/ppc/spapr_vio.h"
  41 #include "hw/qdev-properties.h"
  42 #include "qom/object.h"
  43
  44 struct SpaprNvram {
  45     SpaprVioDevice sdev;
  46     uint32_t size;
  47     uint8_t *buf;
  48     BlockBackend *blk;
  49     VMChangeStateEntry *vmstate;
  50 };
  51
  52 #define TYPE_VIO_SPAPR_NVRAM "spapr-nvram"
  53 OBJECT_DECLARE_SIMPLE_TYPE(SpaprNvram, VIO_SPAPR_NVRAM)
  54
  55 #define MIN_NVRAM_SIZE      (8 * KiB)
  56 #define DEFAULT_NVRAM_SIZE  (64 * KiB)
  57 #define MAX_NVRAM_SIZE      (1 * MiB)
  58
  59 static void rtas_nvram_fetch(PowerPCCPU *cpu, SpaprMachineState *spapr,
  60                              uint32_t token, uint32_t nargs,
  61                              target_ulong args,
  62                              uint32_t nret, target_ulong rets)
  63 {
  64     SpaprNvram *nvram = spapr->nvram;
  65     hwaddr offset, buffer, len;
  66     void *membuf;
  67
  68     if ((nargs != 3) || (nret != 2)) {
  69         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  70         return;
  71     }
  72
  73     if (!nvram) {
  74         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
  75         rtas_st(rets, 1, 0);
  76         return;
  77     }
  78
  79     offset = rtas_ld(args, 0);
  80     buffer = rtas_ld(args, 1);
  81     len = rtas_ld(args, 2);
  82
  83     if (((offset + len) < offset)
  84         || ((offset + len) > nvram->size)) {
  85         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  86         rtas_st(rets, 1, 0);
  87         return;
  88     }
  89
  90     assert(nvram->buf);
  91
  92     membuf = cpu_physical_memory_map(buffer, &len, true);
  93     memcpy(membuf, nvram->buf + offset, len);
  94     cpu_physical_memory_unmap(membuf, len, 1, len);
  95
  96     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  97     rtas_st(rets, 1, len);
  98 }
  99
 100 static void rtas_nvram_store(PowerPCCPU *cpu, SpaprMachineState *spapr,
 101                              uint32_t token, uint32_t nargs,
 102                              target_ulong args,
 103                              uint32_t nret, target_ulong rets)
 104 {
 105     SpaprNvram *nvram = spapr->nvram;
 106     hwaddr offset, buffer, len;
 107     int alen;
 108     void *membuf;
 109
 110     if ((nargs != 3) || (nret != 2)) {
 111         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 112         return;
 113     }
 114
 115     if (!nvram) {
 116         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 117         return;
 118     }
 119
 120     offset = rtas_ld(args, 0);
 121     buffer = rtas_ld(args, 1);
 122     len = rtas_ld(args, 2);
 123
 124     if (((offset + len) < offset)
 125         || ((offset + len) > nvram->size)) {
 126         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 127         return;
 128     }
 129
 130     membuf = cpu_physical_memory_map(buffer, &len, false);
 131
 132     alen = len;
 133     if (nvram->blk) {
 134         alen = blk_pwrite(nvram->blk, offset, membuf, len, 0);
 135     }
 136
 137     assert(nvram->buf);
 138     memcpy(nvram->buf + offset, membuf, len);
 139
 140     cpu_physical_memory_unmap(membuf, len, 0, len);
 141
 142     rtas_st(rets, 0, (alen < len) ? RTAS_OUT_HW_ERROR : RTAS_OUT_SUCCESS);
 143     rtas_st(rets, 1, (alen < 0) ? 0 : alen);
 144 }
 145
 146 static void spapr_nvram_realize(SpaprVioDevice *dev, Error **errp)
 147 {
 148     SpaprNvram *nvram = VIO_SPAPR_NVRAM(dev);
 149     int ret;
 150
 151     if (nvram->blk) {
 152         int64_t len = blk_getlength(nvram->blk);
 153
 154         if (len < 0) {
 155             error_setg_errno(errp, -len,
 156                              "could not get length of backing image");
 157             return;
 158         }
 159
 160         nvram->size = len;
 161
 162         ret = blk_set_perm(nvram->blk,
 163                            BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE,
 164                            BLK_PERM_ALL, errp);
 165         if (ret < 0) {
 166             return;
 167         }
 168     } else {
 169         nvram->size = DEFAULT_NVRAM_SIZE;
 170     }
 171
 172     nvram->buf = g_malloc0(nvram->size);
 173
 174     if ((nvram->size < MIN_NVRAM_SIZE) || (nvram->size > MAX_NVRAM_SIZE)) {
 175         error_setg(errp,
 176                    "spapr-nvram must be between %" PRId64
 177                    " and %" PRId64 " bytes in size",
 178                    MIN_NVRAM_SIZE, MAX_NVRAM_SIZE);
 179         return;
 180     }
 181
 182     if (nvram->blk) {
 183         int alen = blk_pread(nvram->blk, 0, nvram->buf, nvram->size);
 184
 185         if (alen != nvram->size) {
 186             error_setg(errp, "can't read spapr-nvram contents");
 187             return;
 188         }
 189     } else if (nb_prom_envs > 0) {
 190         /* Create a system partition to pass the -prom-env variables */
 191         chrp_nvram_create_system_partition(nvram->buf, MIN_NVRAM_SIZE / 4,
 192                                            nvram->size);
 193         chrp_nvram_create_free_partition(&nvram->buf[MIN_NVRAM_SIZE / 4],
 194                                          nvram->size - MIN_NVRAM_SIZE / 4);
 195     }
 196
 197     spapr_rtas_register(RTAS_NVRAM_FETCH, "nvram-fetch", rtas_nvram_fetch);
 198     spapr_rtas_register(RTAS_NVRAM_STORE, "nvram-store", rtas_nvram_store);
 199 }
 200
 201 static int spapr_nvram_devnode(SpaprVioDevice *dev, void *fdt, int node_off)
 202 {
 203     SpaprNvram *nvram = VIO_SPAPR_NVRAM(dev);
 204
 205     return fdt_setprop_cell(fdt, node_off, "#bytes", nvram->size);
 206 }
 207
 208 static int spapr_nvram_pre_load(void *opaque)
 209 {
 210     SpaprNvram *nvram = VIO_SPAPR_NVRAM(opaque);
 211
 212     g_free(nvram->buf);
 213     nvram->buf = NULL;
 214     nvram->size = 0;
 215
 216     return 0;
 217 }
 218
 219 static void postload_update_cb(void *opaque, int running, RunState state)
 220 {
 221     SpaprNvram *nvram = opaque;
 222
 223     /* This is called after bdrv_invalidate_cache_all.  */
 224
 225     qemu_del_vm_change_state_handler(nvram->vmstate);
 226     nvram->vmstate = NULL;
 227
 228     blk_pwrite(nvram->blk, 0, nvram->buf, nvram->size, 0);
 229 }
 230
 231 static int spapr_nvram_post_load(void *opaque, int version_id)
 232 {
 233     SpaprNvram *nvram = VIO_SPAPR_NVRAM(opaque);
 234
 235     if (nvram->blk) {
 236         nvram->vmstate = qemu_add_vm_change_state_handler(postload_update_cb,
 237                                                           nvram);
 238     }
 239
 240     return 0;
 241 }
 242
 243 static const VMStateDescription vmstate_spapr_nvram = {
 244     .name = "spapr_nvram",
 245     .version_id = 1,
 246     .minimum_version_id = 1,
 247     .pre_load = spapr_nvram_pre_load,
 248     .post_load = spapr_nvram_post_load,
 249     .fields = (VMStateField[]) {
 250         VMSTATE_UINT32(size, SpaprNvram),
 251         VMSTATE_VBUFFER_ALLOC_UINT32(buf, SpaprNvram, 1, NULL, size),
 252         VMSTATE_END_OF_LIST()
 253     },
 254 };
 255
 256 static Property spapr_nvram_properties[] = {
 257     DEFINE_SPAPR_PROPERTIES(SpaprNvram, sdev),
 258     DEFINE_PROP_DRIVE("drive", SpaprNvram, blk),
 259     DEFINE_PROP_END_OF_LIST(),
 260 };
 261
 262 static void spapr_nvram_class_init(ObjectClass *klass, void *data)
 263 {
 264     DeviceClass *dc = DEVICE_CLASS(klass);
 265     SpaprVioDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
 266
 267     k->realize = spapr_nvram_realize;
 268     k->devnode = spapr_nvram_devnode;
 269     k->dt_name = "nvram";
 270     k->dt_type = "nvram";
 271     k->dt_compatible = "qemu,spapr-nvram";
 272     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 273     device_class_set_props(dc, spapr_nvram_properties);
 274     dc->vmsd = &vmstate_spapr_nvram;
 275     /* Reason: Internal device only, uses spapr_rtas_register() in realize() */
 276     dc->user_creatable = false;
 277 }
 278
 279 static const TypeInfo spapr_nvram_type_info = {
 280     .name          = TYPE_VIO_SPAPR_NVRAM,
 281     .parent        = TYPE_VIO_SPAPR_DEVICE,
 282     .instance_size = sizeof(SpaprNvram),
 283     .class_init    = spapr_nvram_class_init,
 284 };
 285
 286 static void spapr_nvram_register_types(void)
 287 {
 288     type_register_static(&spapr_nvram_type_info);
 289 }
 290
 291 type_init(spapr_nvram_register_types)