arch/powerpc/platforms/pseries/mobility.c

   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/completion.h>
  16 #include <linux/device.h>
  17 #include <linux/delay.h>
  18 #include <linux/slab.h>
  19
  20 #include <asm/rtas.h>
  21 #include "pseries.h"
  22
  23 static struct kobject *mobility_kobj;
  24
  25 struct update_props_workarea {
  26         u32 phandle;
  27         u32 state;
  28         u64 reserved;
  29         u32 nprops;
  30 };
  31
  32 #define NODE_ACTION_MASK        0xff000000
  33 #define NODE_COUNT_MASK         0x00ffffff
  34
  35 #define DELETE_DT_NODE  0x01000000
  36 #define UPDATE_DT_NODE  0x02000000
  37 #define ADD_DT_NODE     0x03000000
  38
  39 static int mobility_rtas_call(int token, char *buf)
  40 {
  41         int rc;
  42
  43         spin_lock(&rtas_data_buf_lock);
  44
  45         memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
  46         rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, 1);
  47         memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
  48
  49         spin_unlock(&rtas_data_buf_lock);
  50         return rc;
  51 }
  52
  53 static int delete_dt_node(u32 phandle)
  54 {
  55         struct device_node *dn;
  56
  57         dn = of_find_node_by_phandle(phandle);
  58         if (!dn)
  59                 return -ENOENT;
  60
  61         dlpar_detach_node(dn);
  62         return 0;
  63 }
  64
  65 static int update_dt_property(struct device_node *dn, struct property **prop,
  66                               const char *name, u32 vd, char *value)
  67 {
  68         struct property *new_prop = *prop;
  69         struct property *old_prop;
  70         int more = 0;
  71
  72         /* A negative 'vd' value indicates that only part of the new property
  73          * value is contained in the buffer and we need to call
  74          * ibm,update-properties again to get the rest of the value.
  75          *
  76          * A negative value is also the two's compliment of the actual value.
  77          */
  78         if (vd & 0x80000000) {
  79                 vd = ~vd + 1;
  80                 more = 1;
  81         }
  82
  83         if (new_prop) {
  84                 /* partial property fixup */
  85                 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
  86                 if (!new_data)
  87                         return -ENOMEM;
  88
  89                 memcpy(new_data, new_prop->value, new_prop->length);
  90                 memcpy(new_data + new_prop->length, value, vd);
  91
  92                 kfree(new_prop->value);
  93                 new_prop->value = new_data;
  94                 new_prop->length += vd;
  95         } else {
  96                 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
  97                 if (!new_prop)
  98                         return -ENOMEM;
  99
 100                 new_prop->name = kstrdup(name, GFP_KERNEL);
 101                 if (!new_prop->name) {
 102                         kfree(new_prop);
 103                         return -ENOMEM;
 104                 }
 105
 106                 new_prop->length = vd;
 107                 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
 108                 if (!new_prop->value) {
 109                         kfree(new_prop->name);
 110                         kfree(new_prop);
 111                         return -ENOMEM;
 112                 }
 113
 114                 memcpy(new_prop->value, value, vd);
 115                 *prop = new_prop;
 116         }
 117
 118         if (!more) {
 119                 old_prop = of_find_property(dn, new_prop->name, NULL);
 120                 if (old_prop)
 121                         prom_update_property(dn, new_prop, old_prop);
 122                 else
 123                         prom_add_property(dn, new_prop);
 124
 125                 new_prop = NULL;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static int update_dt_node(u32 phandle)
 132 {
 133         struct update_props_workarea *upwa;
 134         struct device_node *dn;
 135         struct property *prop = NULL;
 136         int i, rc;
 137         char *prop_data;
 138         char *rtas_buf;
 139         int update_properties_token;
 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                 rc = mobility_rtas_call(update_properties_token, rtas_buf);
 160                 if (rc < 0)
 161                         break;
 162
 163                 prop_data = rtas_buf + sizeof(*upwa);
 164
 165                 for (i = 0; i < upwa->nprops; i++) {
 166                         char *prop_name;
 167                         u32 vd;
 168
 169                         prop_name = prop_data + 1;
 170                         prop_data += strlen(prop_name) + 1;
 171                         vd = *prop_data++;
 172
 173                         switch (vd) {
 174                         case 0x00000000:
 175                                 /* name only property, nothing to do */
 176                                 break;
 177
 178                         case 0x80000000:
 179                                 prop = of_find_property(dn, prop_name, NULL);
 180                                 prom_remove_property(dn, prop);
 181                                 prop = NULL;
 182                                 break;
 183
 184                         default:
 185                                 rc = update_dt_property(dn, &prop, prop_name,
 186                                                         vd, prop_data);
 187                                 if (rc) {
 188                                         printk(KERN_ERR "Could not update %s"
 189                                                " property\n", prop_name);
 190                                 }
 191
 192                                 prop_data += vd;
 193                         }
 194                 }
 195         } while (rc == 1);
 196
 197         of_node_put(dn);
 198         kfree(rtas_buf);
 199         return 0;
 200 }
 201
 202 static int add_dt_node(u32 parent_phandle, u32 drc_index)
 203 {
 204         struct device_node *dn;
 205         struct device_node *parent_dn;
 206         int rc;
 207
 208         dn = dlpar_configure_connector(drc_index);
 209         if (!dn)
 210                 return -ENOENT;
 211
 212         parent_dn = of_find_node_by_phandle(parent_phandle);
 213         if (!parent_dn) {
 214                 dlpar_free_cc_nodes(dn);
 215                 return -ENOENT;
 216         }
 217
 218         dn->parent = parent_dn;
 219         rc = dlpar_attach_node(dn);
 220         if (rc)
 221                 dlpar_free_cc_nodes(dn);
 222
 223         of_node_put(parent_dn);
 224         return rc;
 225 }
 226
 227 static int pseries_devicetree_update(void)
 228 {
 229         char *rtas_buf;
 230         u32 *data;
 231         int update_nodes_token;
 232         int rc;
 233
 234         update_nodes_token = rtas_token("ibm,update-nodes");
 235         if (update_nodes_token == RTAS_UNKNOWN_SERVICE)
 236                 return -EINVAL;
 237
 238         rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
 239         if (!rtas_buf)
 240                 return -ENOMEM;
 241
 242         do {
 243                 rc = mobility_rtas_call(update_nodes_token, rtas_buf);
 244                 if (rc && rc != 1)
 245                         break;
 246
 247                 data = (u32 *)rtas_buf + 4;
 248                 while (*data & NODE_ACTION_MASK) {
 249                         int i;
 250                         u32 action = *data & NODE_ACTION_MASK;
 251                         int node_count = *data & NODE_COUNT_MASK;
 252
 253                         data++;
 254
 255                         for (i = 0; i < node_count; i++) {
 256                                 u32 phandle = *data++;
 257                                 u32 drc_index;
 258
 259                                 switch (action) {
 260                                 case DELETE_DT_NODE:
 261                                         delete_dt_node(phandle);
 262                                         break;
 263                                 case UPDATE_DT_NODE:
 264                                         update_dt_node(phandle);
 265                                         break;
 266                                 case ADD_DT_NODE:
 267                                         drc_index = *data++;
 268                                         add_dt_node(phandle, drc_index);
 269                                         break;
 270                                 }
 271                         }
 272                 }
 273         } while (rc == 1);
 274
 275         kfree(rtas_buf);
 276         return rc;
 277 }
 278
 279 void post_mobility_fixup(void)
 280 {
 281         int rc;
 282         int activate_fw_token;
 283
 284         rc = pseries_devicetree_update();
 285         if (rc) {
 286                 printk(KERN_ERR "Initial post-mobility device tree update "
 287                        "failed: %d\n", rc);
 288                 return;
 289         }
 290
 291         activate_fw_token = rtas_token("ibm,activate-firmware");
 292         if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
 293                 printk(KERN_ERR "Could not make post-mobility "
 294                        "activate-fw call.\n");
 295                 return;
 296         }
 297
 298         rc = rtas_call(activate_fw_token, 0, 1, NULL);
 299         if (!rc) {
 300                 rc = pseries_devicetree_update();
 301                 if (rc)
 302                         printk(KERN_ERR "Secondary post-mobility device tree "
 303                                "update failed: %d\n", rc);
 304         } else {
 305                 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
 306                 return;
 307         }
 308
 309         return;
 310 }
 311
 312 static ssize_t migrate_store(struct class *class, struct class_attribute *attr,
 313                              const char *buf, size_t count)
 314 {
 315         struct rtas_args args;
 316         u64 streamid;
 317         int rc;
 318
 319         rc = strict_strtoull(buf, 0, &streamid);
 320         if (rc)
 321                 return rc;
 322
 323         memset(&args, 0, sizeof(args));
 324         args.token = rtas_token("ibm,suspend-me");
 325         args.nargs = 2;
 326         args.nret = 1;
 327
 328         args.args[0] = streamid >> 32 ;
 329         args.args[1] = streamid & 0xffffffff;
 330         args.rets = &args.args[args.nargs];
 331
 332         do {
 333                 args.rets[0] = 0;
 334                 rc = rtas_ibm_suspend_me(&args);
 335                 if (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE)
 336                         ssleep(1);
 337         } while (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE);
 338
 339         if (rc)
 340                 return rc;
 341         else if (args.rets[0])
 342                 return args.rets[0];
 343
 344         post_mobility_fixup();
 345         return count;
 346 }
 347
 348 static CLASS_ATTR(migration, S_IWUSR, NULL, migrate_store);
 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
 360         return rc;
 361 }
 362 device_initcall(mobility_sysfs_init);