1 /* 2 * Support for Partition Mobility/Migration 3 * 4 * Copyright (C) 2010 Nathan Fontenot 5 * Copyright (C) 2010 IBM Corporation 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License version 9 * 2 as published by the Free Software Foundation. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/kobject.h> 14 #include <linux/smp.h> 15 #include <linux/stat.h> 16 #include <linux/completion.h> 17 #include <linux/device.h> 18 #include <linux/delay.h> 19 #include <linux/slab.h> 20 21 #include <asm/machdep.h> 22 #include <asm/rtas.h> 23 #include "pseries.h" 24 25 static struct kobject *mobility_kobj; 26 27 struct update_props_workarea { 28 __be32 phandle; 29 __be32 state; 30 __be64 reserved; 31 __be32 nprops; 32 } __packed; 33 34 #define NODE_ACTION_MASK 0xff000000 35 #define NODE_COUNT_MASK 0x00ffffff 36 37 #define DELETE_DT_NODE 0x01000000 38 #define UPDATE_DT_NODE 0x02000000 39 #define ADD_DT_NODE 0x03000000 40 41 #define MIGRATION_SCOPE (1) 42 #define PRRN_SCOPE -2 43 44 static int mobility_rtas_call(int token, char *buf, s32 scope) 45 { 46 int rc; 47 48 spin_lock(&rtas_data_buf_lock); 49 50 memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE); 51 rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope); 52 memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE); 53 54 spin_unlock(&rtas_data_buf_lock); 55 return rc; 56 } 57 58 static int delete_dt_node(__be32 phandle) 59 { 60 struct device_node *dn; 61 62 dn = of_find_node_by_phandle(be32_to_cpu(phandle)); 63 if (!dn) 64 return -ENOENT; 65 66 dlpar_detach_node(dn); 67 of_node_put(dn); 68 return 0; 69 } 70 71 static int update_dt_property(struct device_node *dn, struct property **prop, 72 const char *name, u32 vd, char *value) 73 { 74 struct property *new_prop = *prop; 75 int more = 0; 76 77 /* A negative 'vd' value indicates that only part of the new property 78 * value is contained in the buffer and we need to call 79 * ibm,update-properties again to get the rest of the value. 80 * 81 * A negative value is also the two's compliment of the actual value. 82 */ 83 if (vd & 0x80000000) { 84 vd = ~vd + 1; 85 more = 1; 86 } 87 88 if (new_prop) { 89 /* partial property fixup */ 90 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL); 91 if (!new_data) 92 return -ENOMEM; 93 94 memcpy(new_data, new_prop->value, new_prop->length); 95 memcpy(new_data + new_prop->length, value, vd); 96 97 kfree(new_prop->value); 98 new_prop->value = new_data; 99 new_prop->length += vd; 100 } else { 101 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL); 102 if (!new_prop) 103 return -ENOMEM; 104 105 new_prop->name = kstrdup(name, GFP_KERNEL); 106 if (!new_prop->name) { 107 kfree(new_prop); 108 return -ENOMEM; 109 } 110 111 new_prop->length = vd; 112 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL); 113 if (!new_prop->value) { 114 kfree(new_prop->name); 115 kfree(new_prop); 116 return -ENOMEM; 117 } 118 119 memcpy(new_prop->value, value, vd); 120 *prop = new_prop; 121 } 122 123 if (!more) { 124 of_update_property(dn, new_prop); 125 *prop = NULL; 126 } 127 128 return 0; 129 } 130 131 static int update_dt_node(__be32 phandle, s32 scope) 132 { 133 struct update_props_workarea *upwa; 134 struct device_node *dn; 135 struct property *prop = NULL; 136 int i, rc, rtas_rc; 137 char *prop_data; 138 char *rtas_buf; 139 int update_properties_token; 140 u32 nprops; 141 u32 vd; 142 143 update_properties_token = rtas_token("ibm,update-properties"); 144 if (update_properties_token == RTAS_UNKNOWN_SERVICE) 145 return -EINVAL; 146 147 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); 148 if (!rtas_buf) 149 return -ENOMEM; 150 151 dn = of_find_node_by_phandle(be32_to_cpu(phandle)); 152 if (!dn) { 153 kfree(rtas_buf); 154 return -ENOENT; 155 } 156 157 upwa = (struct update_props_workarea *)&rtas_buf[0]; 158 upwa->phandle = phandle; 159 160 do { 161 rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf, 162 scope); 163 if (rtas_rc < 0) 164 break; 165 166 prop_data = rtas_buf + sizeof(*upwa); 167 nprops = be32_to_cpu(upwa->nprops); 168 169 /* On the first call to ibm,update-properties for a node the 170 * the first property value descriptor contains an empty 171 * property name, the property value length encoded as u32, 172 * and the property value is the node path being updated. 173 */ 174 if (*prop_data == 0) { 175 prop_data++; 176 vd = be32_to_cpu(*(__be32 *)prop_data); 177 prop_data += vd + sizeof(vd); 178 nprops--; 179 } 180 181 for (i = 0; i < nprops; i++) { 182 char *prop_name; 183 184 prop_name = prop_data; 185 prop_data += strlen(prop_name) + 1; 186 vd = be32_to_cpu(*(__be32 *)prop_data); 187 prop_data += sizeof(vd); 188 189 switch (vd) { 190 case 0x00000000: 191 /* name only property, nothing to do */ 192 break; 193 194 case 0x80000000: 195 of_remove_property(dn, of_find_property(dn, 196 prop_name, NULL)); 197 prop = NULL; 198 break; 199 200 default: 201 rc = update_dt_property(dn, &prop, prop_name, 202 vd, prop_data); 203 if (rc) { 204 printk(KERN_ERR "Could not update %s" 205 " property\n", prop_name); 206 } 207 208 prop_data += vd; 209 } 210 } 211 } while (rtas_rc == 1); 212 213 of_node_put(dn); 214 kfree(rtas_buf); 215 return 0; 216 } 217 218 static int add_dt_node(__be32 parent_phandle, __be32 drc_index) 219 { 220 struct device_node *dn; 221 struct device_node *parent_dn; 222 int rc; 223 224 parent_dn = of_find_node_by_phandle(be32_to_cpu(parent_phandle)); 225 if (!parent_dn) 226 return -ENOENT; 227 228 dn = dlpar_configure_connector(drc_index, parent_dn); 229 if (!dn) { 230 of_node_put(parent_dn); 231 return -ENOENT; 232 } 233 234 rc = dlpar_attach_node(dn, parent_dn); 235 if (rc) 236 dlpar_free_cc_nodes(dn); 237 238 of_node_put(parent_dn); 239 return rc; 240 } 241 242 static void prrn_update_node(__be32 phandle) 243 { 244 struct pseries_hp_errorlog *hp_elog; 245 struct device_node *dn; 246 247 /* 248 * If a node is found from a the given phandle, the phandle does not 249 * represent the drc index of an LMB and we can ignore. 250 */ 251 dn = of_find_node_by_phandle(be32_to_cpu(phandle)); 252 if (dn) { 253 of_node_put(dn); 254 return; 255 } 256 257 hp_elog = kzalloc(sizeof(*hp_elog), GFP_KERNEL); 258 if(!hp_elog) 259 return; 260 261 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM; 262 hp_elog->action = PSERIES_HP_ELOG_ACTION_READD; 263 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX; 264 hp_elog->_drc_u.drc_index = phandle; 265 266 queue_hotplug_event(hp_elog, NULL, NULL); 267 268 kfree(hp_elog); 269 } 270 271 int pseries_devicetree_update(s32 scope) 272 { 273 char *rtas_buf; 274 __be32 *data; 275 int update_nodes_token; 276 int rc; 277 278 update_nodes_token = rtas_token("ibm,update-nodes"); 279 if (update_nodes_token == RTAS_UNKNOWN_SERVICE) 280 return -EINVAL; 281 282 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); 283 if (!rtas_buf) 284 return -ENOMEM; 285 286 do { 287 rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope); 288 if (rc && rc != 1) 289 break; 290 291 data = (__be32 *)rtas_buf + 4; 292 while (be32_to_cpu(*data) & NODE_ACTION_MASK) { 293 int i; 294 u32 action = be32_to_cpu(*data) & NODE_ACTION_MASK; 295 u32 node_count = be32_to_cpu(*data) & NODE_COUNT_MASK; 296 297 data++; 298 299 for (i = 0; i < node_count; i++) { 300 __be32 phandle = *data++; 301 __be32 drc_index; 302 303 switch (action) { 304 case DELETE_DT_NODE: 305 delete_dt_node(phandle); 306 break; 307 case UPDATE_DT_NODE: 308 update_dt_node(phandle, scope); 309 310 if (scope == PRRN_SCOPE) 311 prrn_update_node(phandle); 312 313 break; 314 case ADD_DT_NODE: 315 drc_index = *data++; 316 add_dt_node(phandle, drc_index); 317 break; 318 } 319 } 320 } 321 } while (rc == 1); 322 323 kfree(rtas_buf); 324 return rc; 325 } 326 327 void post_mobility_fixup(void) 328 { 329 int rc; 330 int activate_fw_token; 331 332 activate_fw_token = rtas_token("ibm,activate-firmware"); 333 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) { 334 printk(KERN_ERR "Could not make post-mobility " 335 "activate-fw call.\n"); 336 return; 337 } 338 339 do { 340 rc = rtas_call(activate_fw_token, 0, 1, NULL); 341 } while (rtas_busy_delay(rc)); 342 343 if (rc) 344 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc); 345 346 rc = pseries_devicetree_update(MIGRATION_SCOPE); 347 if (rc) 348 printk(KERN_ERR "Post-mobility device tree update " 349 "failed: %d\n", rc); 350 351 /* Possibly switch to a new RFI flush type */ 352 pseries_setup_rfi_flush(); 353 354 return; 355 } 356 357 static ssize_t migration_store(struct class *class, 358 struct class_attribute *attr, const char *buf, 359 size_t count) 360 { 361 u64 streamid; 362 int rc; 363 364 rc = kstrtou64(buf, 0, &streamid); 365 if (rc) 366 return rc; 367 368 do { 369 rc = rtas_ibm_suspend_me(streamid); 370 if (rc == -EAGAIN) 371 ssleep(1); 372 } while (rc == -EAGAIN); 373 374 if (rc) 375 return rc; 376 377 post_mobility_fixup(); 378 return count; 379 } 380 381 /* 382 * Used by drmgr to determine the kernel behavior of the migration interface. 383 * 384 * Version 1: Performs all PAPR requirements for migration including 385 * firmware activation and device tree update. 386 */ 387 #define MIGRATION_API_VERSION 1 388 389 static CLASS_ATTR_WO(migration); 390 static CLASS_ATTR_STRING(api_version, 0444, __stringify(MIGRATION_API_VERSION)); 391 392 static int __init mobility_sysfs_init(void) 393 { 394 int rc; 395 396 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj); 397 if (!mobility_kobj) 398 return -ENOMEM; 399 400 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr); 401 if (rc) 402 pr_err("mobility: unable to create migration sysfs file (%d)\n", rc); 403 404 rc = sysfs_create_file(mobility_kobj, &class_attr_api_version.attr.attr); 405 if (rc) 406 pr_err("mobility: unable to create api_version sysfs file (%d)\n", rc); 407 408 return 0; 409 } 410 machine_device_initcall(pseries, mobility_sysfs_init); 411