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/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/rtas.h>
  22 #include "pseries.h"
  23
  24 static struct kobject *mobility_kobj;
  25
  26 struct update_props_workarea {
  27         u32 phandle;
  28         u32 state;
  29         u64 reserved;
  30         u32 nprops;
  31 };
  32
  33 #define NODE_ACTION_MASK        0xff000000
  34 #define NODE_COUNT_MASK         0x00ffffff
  35
  36 #define DELETE_DT_NODE  0x01000000
  37 #define UPDATE_DT_NODE  0x02000000
  38 #define ADD_DT_NODE     0x03000000
  39
  40 static int mobility_rtas_call(int token, char *buf)
  41 {
  42         int rc;
  43
  44         spin_lock(&rtas_data_buf_lock);
  45
  46         memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
  47         rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, 1);
  48         memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
  49
  50         spin_unlock(&rtas_data_buf_lock);
  51         return rc;
  52 }
  53
  54 static int delete_dt_node(u32 phandle)
  55 {
  56         struct device_node *dn;
  57
  58         dn = of_find_node_by_phandle(phandle);
  59         if (!dn)
  60                 return -ENOENT;
  61
  62         dlpar_detach_node(dn);
  63         return 0;
  64 }
  65
  66 static int update_dt_property(struct device_node *dn, struct property **prop,
  67                               const char *name, u32 vd, char *value)
  68 {
  69         struct property *new_prop = *prop;
  70         struct property *old_prop;
  71         int more = 0;
  72
  73         /* A negative 'vd' value indicates that only part of the new property
  74          * value is contained in the buffer and we need to call
  75          * ibm,update-properties again to get the rest of the value.
  76          *
  77          * A negative value is also the two's compliment of the actual value.
  78          */
  79         if (vd & 0x80000000) {
  80                 vd = ~vd + 1;
  81                 more = 1;
  82         }
  83
  84         if (new_prop) {
  85                 /* partial property fixup */
  86                 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
  87                 if (!new_data)
  88                         return -ENOMEM;
  89
  90                 memcpy(new_data, new_prop->value, new_prop->length);
  91                 memcpy(new_data + new_prop->length, value, vd);
  92
  93                 kfree(new_prop->value);
  94                 new_prop->value = new_data;
  95                 new_prop->length += vd;
  96         } else {
  97                 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
  98                 if (!new_prop)
  99                         return -ENOMEM;
 100
 101                 new_prop->name = kstrdup(name, GFP_KERNEL);
 102                 if (!new_prop->name) {
 103                         kfree(new_prop);
 104                         return -ENOMEM;
 105                 }
 106
 107                 new_prop->length = vd;
 108                 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
 109                 if (!new_prop->value) {
 110                         kfree(new_prop->name);
 111                         kfree(new_prop);
 112                         return -ENOMEM;
 113                 }
 114
 115                 memcpy(new_prop->value, value, vd);
 116                 *prop = new_prop;
 117         }
 118
 119         if (!more) {
 120                 old_prop = of_find_property(dn, new_prop->name, NULL);
 121                 if (old_prop)
 122                         prom_update_property(dn, new_prop, old_prop);
 123                 else
 124                         prom_add_property(dn, new_prop);
 125
 126                 new_prop = NULL;
 127         }
 128
 129         return 0;
 130 }
 131
 132 static int update_dt_node(u32 phandle)
 133 {
 134         struct update_props_workarea *upwa;
 135         struct device_node *dn;
 136         struct property *prop = NULL;
 137         int i, rc;
 138         char *prop_data;
 139         char *rtas_buf;
 140         int update_properties_token;
 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(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                 rc = mobility_rtas_call(update_properties_token, rtas_buf);
 161                 if (rc < 0)
 162                         break;
 163
 164                 prop_data = rtas_buf + sizeof(*upwa);
 165
 166                 for (i = 0; i < upwa->nprops; i++) {
 167                         char *prop_name;
 168                         u32 vd;
 169
 170                         prop_name = prop_data + 1;
 171                         prop_data += strlen(prop_name) + 1;
 172                         vd = *prop_data++;
 173
 174                         switch (vd) {
 175                         case 0x00000000:
 176                                 /* name only property, nothing to do */
 177                                 break;
 178
 179                         case 0x80000000:
 180                                 prop = of_find_property(dn, prop_name, NULL);
 181                                 prom_remove_property(dn, prop);
 182                                 prop = NULL;
 183                                 break;
 184
 185                         default:
 186                                 rc = update_dt_property(dn, &prop, prop_name,
 187                                                         vd, prop_data);
 188                                 if (rc) {
 189                                         printk(KERN_ERR "Could not update %s"
 190                                                " property\n", prop_name);
 191                                 }
 192
 193                                 prop_data += vd;
 194                         }
 195                 }
 196         } while (rc == 1);
 197
 198         of_node_put(dn);
 199         kfree(rtas_buf);
 200         return 0;
 201 }
 202
 203 static int add_dt_node(u32 parent_phandle, u32 drc_index)
 204 {
 205         struct device_node *dn;
 206         struct device_node *parent_dn;
 207         int rc;
 208
 209         dn = dlpar_configure_connector(drc_index);
 210         if (!dn)
 211                 return -ENOENT;
 212
 213         parent_dn = of_find_node_by_phandle(parent_phandle);
 214         if (!parent_dn) {
 215                 dlpar_free_cc_nodes(dn);
 216                 return -ENOENT;
 217         }
 218
 219         dn->parent = parent_dn;
 220         rc = dlpar_attach_node(dn);
 221         if (rc)
 222                 dlpar_free_cc_nodes(dn);
 223
 224         of_node_put(parent_dn);
 225         return rc;
 226 }
 227
 228 static int pseries_devicetree_update(void)
 229 {
 230         char *rtas_buf;
 231         u32 *data;
 232         int update_nodes_token;
 233         int rc;
 234
 235         update_nodes_token = rtas_token("ibm,update-nodes");
 236         if (update_nodes_token == RTAS_UNKNOWN_SERVICE)
 237                 return -EINVAL;
 238
 239         rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
 240         if (!rtas_buf)
 241                 return -ENOMEM;
 242
 243         do {
 244                 rc = mobility_rtas_call(update_nodes_token, rtas_buf);
 245                 if (rc && rc != 1)
 246                         break;
 247
 248                 data = (u32 *)rtas_buf + 4;
 249                 while (*data & NODE_ACTION_MASK) {
 250                         int i;
 251                         u32 action = *data & NODE_ACTION_MASK;
 252                         int node_count = *data & NODE_COUNT_MASK;
 253
 254                         data++;
 255
 256                         for (i = 0; i < node_count; i++) {
 257                                 u32 phandle = *data++;
 258                                 u32 drc_index;
 259
 260                                 switch (action) {
 261                                 case DELETE_DT_NODE:
 262                                         delete_dt_node(phandle);
 263                                         break;
 264                                 case UPDATE_DT_NODE:
 265                                         update_dt_node(phandle);
 266                                         break;
 267                                 case ADD_DT_NODE:
 268                                         drc_index = *data++;
 269                                         add_dt_node(phandle, drc_index);
 270                                         break;
 271                                 }
 272                         }
 273                 }
 274         } while (rc == 1);
 275
 276         kfree(rtas_buf);
 277         return rc;
 278 }
 279
 280 void post_mobility_fixup(void)
 281 {
 282         int rc;
 283         int activate_fw_token;
 284
 285         rc = pseries_devicetree_update();
 286         if (rc) {
 287                 printk(KERN_ERR "Initial post-mobility device tree update "
 288                        "failed: %d\n", rc);
 289                 return;
 290         }
 291
 292         activate_fw_token = rtas_token("ibm,activate-firmware");
 293         if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
 294                 printk(KERN_ERR "Could not make post-mobility "
 295                        "activate-fw call.\n");
 296                 return;
 297         }
 298
 299         rc = rtas_call(activate_fw_token, 0, 1, NULL);
 300         if (!rc) {
 301                 rc = pseries_devicetree_update();
 302                 if (rc)
 303                         printk(KERN_ERR "Secondary post-mobility device tree "
 304                                "update failed: %d\n", rc);
 305         } else {
 306                 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
 307                 return;
 308         }
 309
 310         return;
 311 }
 312
 313 static ssize_t migrate_store(struct class *class, struct class_attribute *attr,
 314                              const char *buf, size_t count)
 315 {
 316         struct rtas_args args;
 317         u64 streamid;
 318         int rc;
 319
 320         rc = strict_strtoull(buf, 0, &streamid);
 321         if (rc)
 322                 return rc;
 323
 324         memset(&args, 0, sizeof(args));
 325         args.token = rtas_token("ibm,suspend-me");
 326         args.nargs = 2;
 327         args.nret = 1;
 328
 329         args.args[0] = streamid >> 32 ;
 330         args.args[1] = streamid & 0xffffffff;
 331         args.rets = &args.args[args.nargs];
 332
 333         do {
 334                 args.rets[0] = 0;
 335                 rc = rtas_ibm_suspend_me(&args);
 336                 if (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE)
 337                         ssleep(1);
 338         } while (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE);
 339
 340         if (rc)
 341                 return rc;
 342         else if (args.rets[0])
 343                 return args.rets[0];
 344
 345         post_mobility_fixup();
 346         return count;
 347 }
 348
 349 static CLASS_ATTR(migration, S_IWUSR, NULL, migrate_store);
 350
 351 static int __init mobility_sysfs_init(void)
 352 {
 353         int rc;
 354
 355         mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
 356         if (!mobility_kobj)
 357                 return -ENOMEM;
 358
 359         rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
 360
 361         return rc;
 362 }
 363 device_initcall(mobility_sysfs_init);