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 return -ENOENT; 231 232 rc = dlpar_attach_node(dn); 233 if (rc) 234 dlpar_free_cc_nodes(dn); 235 236 of_node_put(parent_dn); 237 return rc; 238 } 239 240 static void prrn_update_node(__be32 phandle) 241 { 242 struct pseries_hp_errorlog *hp_elog; 243 struct device_node *dn; 244 245 /* 246 * If a node is found from a the given phandle, the phandle does not 247 * represent the drc index of an LMB and we can ignore. 248 */ 249 dn = of_find_node_by_phandle(be32_to_cpu(phandle)); 250 if (dn) { 251 of_node_put(dn); 252 return; 253 } 254 255 hp_elog = kzalloc(sizeof(*hp_elog), GFP_KERNEL); 256 if(!hp_elog) 257 return; 258 259 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM; 260 hp_elog->action = PSERIES_HP_ELOG_ACTION_READD; 261 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX; 262 hp_elog->_drc_u.drc_index = phandle; 263 264 queue_hotplug_event(hp_elog, NULL, NULL); 265 266 kfree(hp_elog); 267 } 268 269 int pseries_devicetree_update(s32 scope) 270 { 271 char *rtas_buf; 272 __be32 *data; 273 int update_nodes_token; 274 int rc; 275 276 update_nodes_token = rtas_token("ibm,update-nodes"); 277 if (update_nodes_token == RTAS_UNKNOWN_SERVICE) 278 return -EINVAL; 279 280 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); 281 if (!rtas_buf) 282 return -ENOMEM; 283 284 do { 285 rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope); 286 if (rc && rc != 1) 287 break; 288 289 data = (__be32 *)rtas_buf + 4; 290 while (be32_to_cpu(*data) & NODE_ACTION_MASK) { 291 int i; 292 u32 action = be32_to_cpu(*data) & NODE_ACTION_MASK; 293 u32 node_count = be32_to_cpu(*data) & NODE_COUNT_MASK; 294 295 data++; 296 297 for (i = 0; i < node_count; i++) { 298 __be32 phandle = *data++; 299 __be32 drc_index; 300 301 switch (action) { 302 case DELETE_DT_NODE: 303 delete_dt_node(phandle); 304 break; 305 case UPDATE_DT_NODE: 306 update_dt_node(phandle, scope); 307 308 if (scope == PRRN_SCOPE) 309 prrn_update_node(phandle); 310 311 break; 312 case ADD_DT_NODE: 313 drc_index = *data++; 314 add_dt_node(phandle, drc_index); 315 break; 316 } 317 } 318 } 319 } while (rc == 1); 320 321 kfree(rtas_buf); 322 return rc; 323 } 324 325 void post_mobility_fixup(void) 326 { 327 int rc; 328 int activate_fw_token; 329 330 activate_fw_token = rtas_token("ibm,activate-firmware"); 331 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) { 332 printk(KERN_ERR "Could not make post-mobility " 333 "activate-fw call.\n"); 334 return; 335 } 336 337 do { 338 rc = rtas_call(activate_fw_token, 0, 1, NULL); 339 } while (rtas_busy_delay(rc)); 340 341 if (rc) 342 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc); 343 344 rc = pseries_devicetree_update(MIGRATION_SCOPE); 345 if (rc) 346 printk(KERN_ERR "Post-mobility device tree update " 347 "failed: %d\n", rc); 348 349 return; 350 } 351 352 static ssize_t migration_store(struct class *class, 353 struct class_attribute *attr, const char *buf, 354 size_t count) 355 { 356 u64 streamid; 357 int rc; 358 359 rc = kstrtou64(buf, 0, &streamid); 360 if (rc) 361 return rc; 362 363 do { 364 rc = rtas_ibm_suspend_me(streamid); 365 if (rc == -EAGAIN) 366 ssleep(1); 367 } while (rc == -EAGAIN); 368 369 if (rc) 370 return rc; 371 372 post_mobility_fixup(); 373 return count; 374 } 375 376 /* 377 * Used by drmgr to determine the kernel behavior of the migration interface. 378 * 379 * Version 1: Performs all PAPR requirements for migration including 380 * firmware activation and device tree update. 381 */ 382 #define MIGRATION_API_VERSION 1 383 384 static CLASS_ATTR_WO(migration); 385 static CLASS_ATTR_STRING(api_version, S_IRUGO, __stringify(MIGRATION_API_VERSION)); 386 387 static int __init mobility_sysfs_init(void) 388 { 389 int rc; 390 391 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj); 392 if (!mobility_kobj) 393 return -ENOMEM; 394 395 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr); 396 if (rc) 397 pr_err("mobility: unable to create migration sysfs file (%d)\n", rc); 398 399 rc = sysfs_create_file(mobility_kobj, &class_attr_api_version.attr.attr); 400 if (rc) 401 pr_err("mobility: unable to create api_version sysfs file (%d)\n", rc); 402 403 return 0; 404 } 405 machine_device_initcall(pseries, mobility_sysfs_init); 406