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 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(__be32 phandle) 58 { 59 struct device_node *dn; 60 61 dn = of_find_node_by_phandle(be32_to_cpu(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(__be32 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 nprops; 140 u32 vd; 141 142 update_properties_token = rtas_token("ibm,update-properties"); 143 if (update_properties_token == RTAS_UNKNOWN_SERVICE) 144 return -EINVAL; 145 146 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); 147 if (!rtas_buf) 148 return -ENOMEM; 149 150 dn = of_find_node_by_phandle(be32_to_cpu(phandle)); 151 if (!dn) { 152 kfree(rtas_buf); 153 return -ENOENT; 154 } 155 156 upwa = (struct update_props_workarea *)&rtas_buf[0]; 157 upwa->phandle = phandle; 158 159 do { 160 rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf, 161 scope); 162 if (rtas_rc < 0) 163 break; 164 165 prop_data = rtas_buf + sizeof(*upwa); 166 nprops = be32_to_cpu(upwa->nprops); 167 168 /* On the first call to ibm,update-properties for a node the 169 * the first property value descriptor contains an empty 170 * property name, the property value length encoded as u32, 171 * and the property value is the node path being updated. 172 */ 173 if (*prop_data == 0) { 174 prop_data++; 175 vd = be32_to_cpu(*(__be32 *)prop_data); 176 prop_data += vd + sizeof(vd); 177 nprops--; 178 } 179 180 for (i = 0; i < nprops; i++) { 181 char *prop_name; 182 183 prop_name = prop_data; 184 prop_data += strlen(prop_name) + 1; 185 vd = be32_to_cpu(*(__be32 *)prop_data); 186 prop_data += sizeof(vd); 187 188 switch (vd) { 189 case 0x00000000: 190 /* name only property, nothing to do */ 191 break; 192 193 case 0x80000000: 194 prop = of_find_property(dn, prop_name, NULL); 195 of_remove_property(dn, prop); 196 prop = NULL; 197 break; 198 199 default: 200 rc = update_dt_property(dn, &prop, prop_name, 201 vd, prop_data); 202 if (rc) { 203 printk(KERN_ERR "Could not update %s" 204 " property\n", prop_name); 205 } 206 207 prop_data += vd; 208 } 209 } 210 } while (rtas_rc == 1); 211 212 of_node_put(dn); 213 kfree(rtas_buf); 214 return 0; 215 } 216 217 static int add_dt_node(__be32 parent_phandle, __be32 drc_index) 218 { 219 struct device_node *dn; 220 struct device_node *parent_dn; 221 int rc; 222 223 parent_dn = of_find_node_by_phandle(be32_to_cpu(parent_phandle)); 224 if (!parent_dn) 225 return -ENOENT; 226 227 dn = dlpar_configure_connector(drc_index, parent_dn); 228 if (!dn) 229 return -ENOENT; 230 231 rc = dlpar_attach_node(dn); 232 if (rc) 233 dlpar_free_cc_nodes(dn); 234 235 of_node_put(parent_dn); 236 return rc; 237 } 238 239 int pseries_devicetree_update(s32 scope) 240 { 241 char *rtas_buf; 242 __be32 *data; 243 int update_nodes_token; 244 int rc; 245 246 update_nodes_token = rtas_token("ibm,update-nodes"); 247 if (update_nodes_token == RTAS_UNKNOWN_SERVICE) 248 return -EINVAL; 249 250 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); 251 if (!rtas_buf) 252 return -ENOMEM; 253 254 do { 255 rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope); 256 if (rc && rc != 1) 257 break; 258 259 data = (__be32 *)rtas_buf + 4; 260 while (be32_to_cpu(*data) & NODE_ACTION_MASK) { 261 int i; 262 u32 action = be32_to_cpu(*data) & NODE_ACTION_MASK; 263 u32 node_count = be32_to_cpu(*data) & NODE_COUNT_MASK; 264 265 data++; 266 267 for (i = 0; i < node_count; i++) { 268 __be32 phandle = *data++; 269 __be32 drc_index; 270 271 switch (action) { 272 case DELETE_DT_NODE: 273 delete_dt_node(phandle); 274 break; 275 case UPDATE_DT_NODE: 276 update_dt_node(phandle, scope); 277 break; 278 case ADD_DT_NODE: 279 drc_index = *data++; 280 add_dt_node(phandle, drc_index); 281 break; 282 } 283 } 284 } 285 } while (rc == 1); 286 287 kfree(rtas_buf); 288 return rc; 289 } 290 291 void post_mobility_fixup(void) 292 { 293 int rc; 294 int activate_fw_token; 295 296 activate_fw_token = rtas_token("ibm,activate-firmware"); 297 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) { 298 printk(KERN_ERR "Could not make post-mobility " 299 "activate-fw call.\n"); 300 return; 301 } 302 303 do { 304 rc = rtas_call(activate_fw_token, 0, 1, NULL); 305 } while (rtas_busy_delay(rc)); 306 307 if (rc) 308 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc); 309 310 rc = pseries_devicetree_update(MIGRATION_SCOPE); 311 if (rc) 312 printk(KERN_ERR "Post-mobility device tree update " 313 "failed: %d\n", rc); 314 315 return; 316 } 317 318 static ssize_t migrate_store(struct class *class, struct class_attribute *attr, 319 const char *buf, size_t count) 320 { 321 u64 streamid; 322 int rc; 323 int vasi_rc = 0; 324 325 rc = kstrtou64(buf, 0, &streamid); 326 if (rc) 327 return rc; 328 329 do { 330 rc = rtas_ibm_suspend_me(streamid, &vasi_rc); 331 if (!rc && vasi_rc == RTAS_NOT_SUSPENDABLE) 332 ssleep(1); 333 } while (!rc && vasi_rc == RTAS_NOT_SUSPENDABLE); 334 335 if (rc) 336 return rc; 337 if (vasi_rc) 338 return vasi_rc; 339 340 post_mobility_fixup(); 341 return count; 342 } 343 344 static CLASS_ATTR(migration, S_IWUSR, NULL, migrate_store); 345 346 static int __init mobility_sysfs_init(void) 347 { 348 int rc; 349 350 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj); 351 if (!mobility_kobj) 352 return -ENOMEM; 353 354 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr); 355 356 return rc; 357 } 358 machine_device_initcall(pseries, mobility_sysfs_init); 359