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 u32 phandle; 29 u32 state; 30 u64 reserved; 31 u32 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 43 static int mobility_rtas_call(int token, char *buf, s32 scope) 44 { 45 int rc; 46 47 spin_lock(&rtas_data_buf_lock); 48 49 memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE); 50 rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope); 51 memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE); 52 53 spin_unlock(&rtas_data_buf_lock); 54 return rc; 55 } 56 57 static int delete_dt_node(u32 phandle) 58 { 59 struct device_node *dn; 60 61 dn = of_find_node_by_phandle(phandle); 62 if (!dn) 63 return -ENOENT; 64 65 dlpar_detach_node(dn); 66 of_node_put(dn); 67 return 0; 68 } 69 70 static int update_dt_property(struct device_node *dn, struct property **prop, 71 const char *name, u32 vd, char *value) 72 { 73 struct property *new_prop = *prop; 74 int more = 0; 75 76 /* A negative 'vd' value indicates that only part of the new property 77 * value is contained in the buffer and we need to call 78 * ibm,update-properties again to get the rest of the value. 79 * 80 * A negative value is also the two's compliment of the actual value. 81 */ 82 if (vd & 0x80000000) { 83 vd = ~vd + 1; 84 more = 1; 85 } 86 87 if (new_prop) { 88 /* partial property fixup */ 89 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL); 90 if (!new_data) 91 return -ENOMEM; 92 93 memcpy(new_data, new_prop->value, new_prop->length); 94 memcpy(new_data + new_prop->length, value, vd); 95 96 kfree(new_prop->value); 97 new_prop->value = new_data; 98 new_prop->length += vd; 99 } else { 100 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL); 101 if (!new_prop) 102 return -ENOMEM; 103 104 new_prop->name = kstrdup(name, GFP_KERNEL); 105 if (!new_prop->name) { 106 kfree(new_prop); 107 return -ENOMEM; 108 } 109 110 new_prop->length = vd; 111 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL); 112 if (!new_prop->value) { 113 kfree(new_prop->name); 114 kfree(new_prop); 115 return -ENOMEM; 116 } 117 118 memcpy(new_prop->value, value, vd); 119 *prop = new_prop; 120 } 121 122 if (!more) { 123 of_update_property(dn, new_prop); 124 *prop = NULL; 125 } 126 127 return 0; 128 } 129 130 static int update_dt_node(u32 phandle, s32 scope) 131 { 132 struct update_props_workarea *upwa; 133 struct device_node *dn; 134 struct property *prop = NULL; 135 int i, rc, rtas_rc; 136 char *prop_data; 137 char *rtas_buf; 138 int update_properties_token; 139 u32 vd; 140 141 update_properties_token = rtas_token("ibm,update-properties"); 142 if (update_properties_token == RTAS_UNKNOWN_SERVICE) 143 return -EINVAL; 144 145 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); 146 if (!rtas_buf) 147 return -ENOMEM; 148 149 dn = of_find_node_by_phandle(phandle); 150 if (!dn) { 151 kfree(rtas_buf); 152 return -ENOENT; 153 } 154 155 upwa = (struct update_props_workarea *)&rtas_buf[0]; 156 upwa->phandle = phandle; 157 158 do { 159 rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf, 160 scope); 161 if (rtas_rc < 0) 162 break; 163 164 prop_data = rtas_buf + sizeof(*upwa); 165 166 /* On the first call to ibm,update-properties for a node the 167 * the first property value descriptor contains an empty 168 * property name, the property value length encoded as u32, 169 * and the property value is the node path being updated. 170 */ 171 if (*prop_data == 0) { 172 prop_data++; 173 vd = *(u32 *)prop_data; 174 prop_data += vd + sizeof(vd); 175 upwa->nprops--; 176 } 177 178 for (i = 0; i < upwa->nprops; i++) { 179 char *prop_name; 180 181 prop_name = prop_data; 182 prop_data += strlen(prop_name) + 1; 183 vd = *(u32 *)prop_data; 184 prop_data += sizeof(vd); 185 186 switch (vd) { 187 case 0x00000000: 188 /* name only property, nothing to do */ 189 break; 190 191 case 0x80000000: 192 prop = of_find_property(dn, prop_name, NULL); 193 of_remove_property(dn, prop); 194 prop = NULL; 195 break; 196 197 default: 198 rc = update_dt_property(dn, &prop, prop_name, 199 vd, prop_data); 200 if (rc) { 201 printk(KERN_ERR "Could not update %s" 202 " property\n", prop_name); 203 } 204 205 prop_data += vd; 206 } 207 } 208 } while (rtas_rc == 1); 209 210 of_node_put(dn); 211 kfree(rtas_buf); 212 return 0; 213 } 214 215 static int add_dt_node(u32 parent_phandle, u32 drc_index) 216 { 217 struct device_node *dn; 218 struct device_node *parent_dn; 219 int rc; 220 221 parent_dn = of_find_node_by_phandle(parent_phandle); 222 if (!parent_dn) 223 return -ENOENT; 224 225 dn = dlpar_configure_connector(drc_index, parent_dn); 226 if (!dn) 227 return -ENOENT; 228 229 rc = dlpar_attach_node(dn); 230 if (rc) 231 dlpar_free_cc_nodes(dn); 232 233 of_node_put(parent_dn); 234 return rc; 235 } 236 237 int pseries_devicetree_update(s32 scope) 238 { 239 char *rtas_buf; 240 u32 *data; 241 int update_nodes_token; 242 int rc; 243 244 update_nodes_token = rtas_token("ibm,update-nodes"); 245 if (update_nodes_token == RTAS_UNKNOWN_SERVICE) 246 return -EINVAL; 247 248 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); 249 if (!rtas_buf) 250 return -ENOMEM; 251 252 do { 253 rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope); 254 if (rc && rc != 1) 255 break; 256 257 data = (u32 *)rtas_buf + 4; 258 while (*data & NODE_ACTION_MASK) { 259 int i; 260 u32 action = *data & NODE_ACTION_MASK; 261 int node_count = *data & NODE_COUNT_MASK; 262 263 data++; 264 265 for (i = 0; i < node_count; i++) { 266 u32 phandle = *data++; 267 u32 drc_index; 268 269 switch (action) { 270 case DELETE_DT_NODE: 271 delete_dt_node(phandle); 272 break; 273 case UPDATE_DT_NODE: 274 update_dt_node(phandle, scope); 275 break; 276 case ADD_DT_NODE: 277 drc_index = *data++; 278 add_dt_node(phandle, drc_index); 279 break; 280 } 281 } 282 } 283 } while (rc == 1); 284 285 kfree(rtas_buf); 286 return rc; 287 } 288 289 void post_mobility_fixup(void) 290 { 291 int rc; 292 int activate_fw_token; 293 294 activate_fw_token = rtas_token("ibm,activate-firmware"); 295 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) { 296 printk(KERN_ERR "Could not make post-mobility " 297 "activate-fw call.\n"); 298 return; 299 } 300 301 do { 302 rc = rtas_call(activate_fw_token, 0, 1, NULL); 303 } while (rtas_busy_delay(rc)); 304 305 if (rc) 306 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc); 307 308 rc = pseries_devicetree_update(MIGRATION_SCOPE); 309 if (rc) 310 printk(KERN_ERR "Post-mobility device tree update " 311 "failed: %d\n", rc); 312 313 return; 314 } 315 316 static ssize_t migrate_store(struct class *class, struct class_attribute *attr, 317 const char *buf, size_t count) 318 { 319 u64 streamid; 320 int rc; 321 322 rc = kstrtou64(buf, 0, &streamid); 323 if (rc) 324 return rc; 325 326 do { 327 rc = rtas_ibm_suspend_me(streamid); 328 if (rc == -EAGAIN) 329 ssleep(1); 330 } while (rc == -EAGAIN); 331 332 if (rc) 333 return rc; 334 335 post_mobility_fixup(); 336 return count; 337 } 338 339 /* 340 * Used by drmgr to determine the kernel behavior of the migration interface. 341 * 342 * Version 1: Performs all PAPR requirements for migration including 343 * firmware activation and device tree update. 344 */ 345 #define MIGRATION_API_VERSION 1 346 347 static CLASS_ATTR(migration, S_IWUSR, NULL, migrate_store); 348 static CLASS_ATTR_STRING(api_version, S_IRUGO, __stringify(MIGRATION_API_VERSION)); 349 350 static int __init mobility_sysfs_init(void) 351 { 352 int rc; 353 354 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj); 355 if (!mobility_kobj) 356 return -ENOMEM; 357 358 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr); 359 if (rc) 360 pr_err("mobility: unable to create migration sysfs file (%d)\n", rc); 361 362 rc = sysfs_create_file(mobility_kobj, &class_attr_api_version.attr.attr); 363 if (rc) 364 pr_err("mobility: unable to create api_version sysfs file (%d)\n", rc); 365 366 return 0; 367 } 368 machine_device_initcall(pseries, mobility_sysfs_init); 369