spapr_nvram.c (8542B)
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 <libfdt.h> 30 31 #include "sysemu/block-backend.h" 32 #include "sysemu/device_tree.h" 33 #include "sysemu/sysemu.h" 34 #include "sysemu/runstate.h" 35 #include "migration/vmstate.h" 36 #include "hw/nvram/chrp_nvram.h" 37 #include "hw/ppc/spapr.h" 38 #include "hw/ppc/spapr_vio.h" 39 #include "hw/qdev-properties.h" 40 #include "hw/qdev-properties-system.h" 41 #include "qom/object.h" 42 43 struct SpaprNvram { 44 SpaprVioDevice sdev; 45 uint32_t size; 46 uint8_t *buf; 47 BlockBackend *blk; 48 VMChangeStateEntry *vmstate; 49 }; 50 51 #define TYPE_VIO_SPAPR_NVRAM "spapr-nvram" 52 OBJECT_DECLARE_SIMPLE_TYPE(SpaprNvram, VIO_SPAPR_NVRAM) 53 54 #define MIN_NVRAM_SIZE (8 * KiB) 55 #define DEFAULT_NVRAM_SIZE (64 * KiB) 56 #define MAX_NVRAM_SIZE (1 * MiB) 57 58 static void rtas_nvram_fetch(PowerPCCPU *cpu, SpaprMachineState *spapr, 59 uint32_t token, uint32_t nargs, 60 target_ulong args, 61 uint32_t nret, target_ulong rets) 62 { 63 SpaprNvram *nvram = spapr->nvram; 64 hwaddr offset, buffer, len; 65 void *membuf; 66 67 if ((nargs != 3) || (nret != 2)) { 68 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 69 return; 70 } 71 72 if (!nvram) { 73 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 74 rtas_st(rets, 1, 0); 75 return; 76 } 77 78 offset = rtas_ld(args, 0); 79 buffer = rtas_ld(args, 1); 80 len = rtas_ld(args, 2); 81 82 if (((offset + len) < offset) 83 || ((offset + len) > nvram->size)) { 84 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 85 rtas_st(rets, 1, 0); 86 return; 87 } 88 89 assert(nvram->buf); 90 91 membuf = cpu_physical_memory_map(buffer, &len, true); 92 memcpy(membuf, nvram->buf + offset, len); 93 cpu_physical_memory_unmap(membuf, len, 1, len); 94 95 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 96 rtas_st(rets, 1, len); 97 } 98 99 static void rtas_nvram_store(PowerPCCPU *cpu, SpaprMachineState *spapr, 100 uint32_t token, uint32_t nargs, 101 target_ulong args, 102 uint32_t nret, target_ulong rets) 103 { 104 SpaprNvram *nvram = spapr->nvram; 105 hwaddr offset, buffer, len; 106 int ret; 107 void *membuf; 108 109 if ((nargs != 3) || (nret != 2)) { 110 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 111 return; 112 } 113 114 if (!nvram) { 115 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 116 return; 117 } 118 119 offset = rtas_ld(args, 0); 120 buffer = rtas_ld(args, 1); 121 len = rtas_ld(args, 2); 122 123 if (((offset + len) < offset) 124 || ((offset + len) > nvram->size)) { 125 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 126 return; 127 } 128 129 membuf = cpu_physical_memory_map(buffer, &len, false); 130 131 ret = 0; 132 if (nvram->blk) { 133 ret = blk_pwrite(nvram->blk, offset, len, membuf, 0); 134 } 135 136 assert(nvram->buf); 137 memcpy(nvram->buf + offset, membuf, len); 138 139 cpu_physical_memory_unmap(membuf, len, 0, len); 140 141 rtas_st(rets, 0, (ret < 0) ? RTAS_OUT_HW_ERROR : RTAS_OUT_SUCCESS); 142 rtas_st(rets, 1, (ret < 0) ? 0 : len); 143 } 144 145 static void spapr_nvram_realize(SpaprVioDevice *dev, Error **errp) 146 { 147 SpaprNvram *nvram = VIO_SPAPR_NVRAM(dev); 148 int ret; 149 150 if (nvram->blk) { 151 int64_t len = blk_getlength(nvram->blk); 152 153 if (len < 0) { 154 error_setg_errno(errp, -len, 155 "could not get length of backing image"); 156 return; 157 } 158 159 nvram->size = len; 160 161 ret = blk_set_perm(nvram->blk, 162 BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE, 163 BLK_PERM_ALL, errp); 164 if (ret < 0) { 165 return; 166 } 167 } else { 168 nvram->size = DEFAULT_NVRAM_SIZE; 169 } 170 171 nvram->buf = g_malloc0(nvram->size); 172 173 if ((nvram->size < MIN_NVRAM_SIZE) || (nvram->size > MAX_NVRAM_SIZE)) { 174 error_setg(errp, 175 "spapr-nvram must be between %" PRId64 176 " and %" PRId64 " bytes in size", 177 MIN_NVRAM_SIZE, MAX_NVRAM_SIZE); 178 return; 179 } 180 181 if (nvram->blk) { 182 ret = blk_pread(nvram->blk, 0, nvram->size, nvram->buf, 0); 183 184 if (ret < 0) { 185 error_setg(errp, "can't read spapr-nvram contents"); 186 return; 187 } 188 } else if (nb_prom_envs > 0) { 189 /* Create a system partition to pass the -prom-env variables */ 190 chrp_nvram_create_system_partition(nvram->buf, MIN_NVRAM_SIZE / 4, 191 nvram->size); 192 chrp_nvram_create_free_partition(&nvram->buf[MIN_NVRAM_SIZE / 4], 193 nvram->size - MIN_NVRAM_SIZE / 4); 194 } 195 196 spapr_rtas_register(RTAS_NVRAM_FETCH, "nvram-fetch", rtas_nvram_fetch); 197 spapr_rtas_register(RTAS_NVRAM_STORE, "nvram-store", rtas_nvram_store); 198 } 199 200 static int spapr_nvram_devnode(SpaprVioDevice *dev, void *fdt, int node_off) 201 { 202 SpaprNvram *nvram = VIO_SPAPR_NVRAM(dev); 203 204 return fdt_setprop_cell(fdt, node_off, "#bytes", nvram->size); 205 } 206 207 static int spapr_nvram_pre_load(void *opaque) 208 { 209 SpaprNvram *nvram = VIO_SPAPR_NVRAM(opaque); 210 211 g_free(nvram->buf); 212 nvram->buf = NULL; 213 nvram->size = 0; 214 215 return 0; 216 } 217 218 static void postload_update_cb(void *opaque, bool running, RunState state) 219 { 220 SpaprNvram *nvram = opaque; 221 222 /* This is called after bdrv_activate_all. */ 223 224 qemu_del_vm_change_state_handler(nvram->vmstate); 225 nvram->vmstate = NULL; 226 227 blk_pwrite(nvram->blk, 0, nvram->size, nvram->buf, 0); 228 } 229 230 static int spapr_nvram_post_load(void *opaque, int version_id) 231 { 232 SpaprNvram *nvram = VIO_SPAPR_NVRAM(opaque); 233 234 if (nvram->blk) { 235 nvram->vmstate = qemu_add_vm_change_state_handler(postload_update_cb, 236 nvram); 237 } 238 239 return 0; 240 } 241 242 static const VMStateDescription vmstate_spapr_nvram = { 243 .name = "spapr_nvram", 244 .version_id = 1, 245 .minimum_version_id = 1, 246 .pre_load = spapr_nvram_pre_load, 247 .post_load = spapr_nvram_post_load, 248 .fields = (VMStateField[]) { 249 VMSTATE_UINT32(size, SpaprNvram), 250 VMSTATE_VBUFFER_ALLOC_UINT32(buf, SpaprNvram, 1, NULL, size), 251 VMSTATE_END_OF_LIST() 252 }, 253 }; 254 255 static Property spapr_nvram_properties[] = { 256 DEFINE_SPAPR_PROPERTIES(SpaprNvram, sdev), 257 DEFINE_PROP_DRIVE("drive", SpaprNvram, blk), 258 DEFINE_PROP_END_OF_LIST(), 259 }; 260 261 static void spapr_nvram_class_init(ObjectClass *klass, void *data) 262 { 263 DeviceClass *dc = DEVICE_CLASS(klass); 264 SpaprVioDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); 265 266 k->realize = spapr_nvram_realize; 267 k->devnode = spapr_nvram_devnode; 268 k->dt_name = "nvram"; 269 k->dt_type = "nvram"; 270 k->dt_compatible = "qemu,spapr-nvram"; 271 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 272 device_class_set_props(dc, spapr_nvram_properties); 273 dc->vmsd = &vmstate_spapr_nvram; 274 /* Reason: Internal device only, uses spapr_rtas_register() in realize() */ 275 dc->user_creatable = false; 276 } 277 278 static const TypeInfo spapr_nvram_type_info = { 279 .name = TYPE_VIO_SPAPR_NVRAM, 280 .parent = TYPE_VIO_SPAPR_DEVICE, 281 .instance_size = sizeof(SpaprNvram), 282 .class_init = spapr_nvram_class_init, 283 }; 284 285 static void spapr_nvram_register_types(void) 286 { 287 type_register_static(&spapr_nvram_type_info); 288 } 289 290 type_init(spapr_nvram_register_types)