git.oblomov.eu Git - linux-2.6/blob - arch/powerpc/kernel/lparcfg.c

   1 /*
   2  * PowerPC64 LPAR Configuration Information Driver
   3  *
   4  * Dave Engebretsen engebret@us.ibm.com
   5  *    Copyright (c) 2003 Dave Engebretsen
   6  * Will Schmidt willschm@us.ibm.com
   7  *    SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
   8  *    seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
   9  * Nathan Lynch nathanl@austin.ibm.com
  10  *    Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  * This driver creates a proc file at /proc/ppc64/lparcfg which contains
  18  * keyword - value pairs that specify the configuration of the partition.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/errno.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/init.h>
  26 #include <linux/seq_file.h>
  27 #include <asm/uaccess.h>
  28 #include <asm/iseries/hv_lp_config.h>
  29 #include <asm/lppaca.h>
  30 #include <asm/hvcall.h>
  31 #include <asm/firmware.h>
  32 #include <asm/rtas.h>
  33 #include <asm/system.h>
  34 #include <asm/time.h>
  35 #include <asm/prom.h>
  36 #include <asm/vdso_datapage.h>
  37 #include <asm/vio.h>
  38
  39 #define MODULE_VERS "1.8"
  40 #define MODULE_NAME "lparcfg"
  41
  42 /* #define LPARCFG_DEBUG */
  43
  44 static struct proc_dir_entry *proc_ppc64_lparcfg;
  45
  46 /*
  47  * Track sum of all purrs across all processors. This is used to further
  48  * calculate usage values by different applications
  49  */
  50 static unsigned long get_purr(void)
  51 {
  52         unsigned long sum_purr = 0;
  53         int cpu;
  54
  55         for_each_possible_cpu(cpu) {
  56                 if (firmware_has_feature(FW_FEATURE_ISERIES))
  57                         sum_purr += lppaca[cpu].emulated_time_base;
  58                 else {
  59                         struct cpu_usage *cu;
  60
  61                         cu = &per_cpu(cpu_usage_array, cpu);
  62                         sum_purr += cu->current_tb;
  63                 }
  64         }
  65         return sum_purr;
  66 }
  67
  68 #ifdef CONFIG_PPC_ISERIES
  69
  70 /*
  71  * Methods used to fetch LPAR data when running on an iSeries platform.
  72  */
  73 static int iseries_lparcfg_data(struct seq_file *m, void *v)
  74 {
  75         unsigned long pool_id;
  76         int shared, entitled_capacity, max_entitled_capacity;
  77         int processors, max_processors;
  78         unsigned long purr = get_purr();
  79
  80         shared = (int)(local_paca->lppaca_ptr->shared_proc);
  81
  82         seq_printf(m, "system_active_processors=%d\n",
  83                    (int)HvLpConfig_getSystemPhysicalProcessors());
  84
  85         seq_printf(m, "system_potential_processors=%d\n",
  86                    (int)HvLpConfig_getSystemPhysicalProcessors());
  87
  88         processors = (int)HvLpConfig_getPhysicalProcessors();
  89         seq_printf(m, "partition_active_processors=%d\n", processors);
  90
  91         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
  92         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
  93
  94         if (shared) {
  95                 entitled_capacity = HvLpConfig_getSharedProcUnits();
  96                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
  97         } else {
  98                 entitled_capacity = processors * 100;
  99                 max_entitled_capacity = max_processors * 100;
 100         }
 101         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
 102
 103         seq_printf(m, "partition_max_entitled_capacity=%d\n",
 104                    max_entitled_capacity);
 105
 106         if (shared) {
 107                 pool_id = HvLpConfig_getSharedPoolIndex();
 108                 seq_printf(m, "pool=%d\n", (int)pool_id);
 109                 seq_printf(m, "pool_capacity=%d\n",
 110                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
 111                                  100));
 112                 seq_printf(m, "purr=%ld\n", purr);
 113         }
 114
 115         seq_printf(m, "shared_processor_mode=%d\n", shared);
 116
 117         return 0;
 118 }
 119
 120 #else                           /* CONFIG_PPC_ISERIES */
 121
 122 static int iseries_lparcfg_data(struct seq_file *m, void *v)
 123 {
 124         return 0;
 125 }
 126
 127 #endif                          /* CONFIG_PPC_ISERIES */
 128
 129 #ifdef CONFIG_PPC_PSERIES
 130 /*
 131  * Methods used to fetch LPAR data when running on a pSeries platform.
 132  */
 133 /**
 134  * h_get_mpp
 135  * H_GET_MPP hcall returns info in 7 parms
 136  */
 137 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
 138 {
 139         int rc;
 140         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 141
 142         rc = plpar_hcall9(H_GET_MPP, retbuf);
 143
 144         mpp_data->entitled_mem = retbuf[0];
 145         mpp_data->mapped_mem = retbuf[1];
 146
 147         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 148         mpp_data->pool_num = retbuf[2] & 0xffff;
 149
 150         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
 151         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
 152         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffff;
 153
 154         mpp_data->pool_size = retbuf[4];
 155         mpp_data->loan_request = retbuf[5];
 156         mpp_data->backing_mem = retbuf[6];
 157
 158         return rc;
 159 }
 160 EXPORT_SYMBOL(h_get_mpp);
 161
 162 struct hvcall_ppp_data {
 163         u64     entitlement;
 164         u64     unallocated_entitlement;
 165         u16     group_num;
 166         u16     pool_num;
 167         u8      capped;
 168         u8      weight;
 169         u8      unallocated_weight;
 170         u16     active_procs_in_pool;
 171         u16     active_system_procs;
 172 };
 173
 174 /*
 175  * H_GET_PPP hcall returns info in 4 parms.
 176  *  entitled_capacity,unallocated_capacity,
 177  *  aggregation, resource_capability).
 178  *
 179  *  R4 = Entitled Processor Capacity Percentage.
 180  *  R5 = Unallocated Processor Capacity Percentage.
 181  *  R6 (AABBCCDDEEFFGGHH).
 182  *      XXXX - reserved (0)
 183  *          XXXX - reserved (0)
 184  *              XXXX - Group Number
 185  *                  XXXX - Pool Number.
 186  *  R7 (IIJJKKLLMMNNOOPP).
 187  *      XX - reserved. (0)
 188  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 189  *          XX - variable processor Capacity Weight
 190  *            XX - Unallocated Variable Processor Capacity Weight.
 191  *              XXXX - Active processors in Physical Processor Pool.
 192  *                  XXXX  - Processors active on platform.
 193  */
 194 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 195 {
 196         unsigned long rc;
 197         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 198
 199         rc = plpar_hcall(H_GET_PPP, retbuf);
 200
 201         ppp_data->entitlement = retbuf[0];
 202         ppp_data->unallocated_entitlement = retbuf[1];
 203
 204         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 205         ppp_data->pool_num = retbuf[2] & 0xffff;
 206
 207         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 208         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 209         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 210         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 211         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 212
 213         return rc;
 214 }
 215
 216 static unsigned h_pic(unsigned long *pool_idle_time,
 217                       unsigned long *num_procs)
 218 {
 219         unsigned long rc;
 220         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 221
 222         rc = plpar_hcall(H_PIC, retbuf);
 223
 224         *pool_idle_time = retbuf[0];
 225         *num_procs = retbuf[1];
 226
 227         return rc;
 228 }
 229
 230 /*
 231  * parse_ppp_data
 232  * Parse out the data returned from h_get_ppp and h_pic
 233  */
 234 static void parse_ppp_data(struct seq_file *m)
 235 {
 236         struct hvcall_ppp_data ppp_data;
 237         int rc;
 238
 239         rc = h_get_ppp(&ppp_data);
 240         if (rc)
 241                 return;
 242
 243         seq_printf(m, "partition_entitled_capacity=%lld\n",
 244                    ppp_data.entitlement);
 245         seq_printf(m, "group=%d\n", ppp_data.group_num);
 246         seq_printf(m, "system_active_processors=%d\n",
 247                    ppp_data.active_system_procs);
 248
 249         /* pool related entries are apropriate for shared configs */
 250         if (lppaca[0].shared_proc) {
 251                 unsigned long pool_idle_time, pool_procs;
 252
 253                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 254
 255                 /* report pool_capacity in percentage */
 256                 seq_printf(m, "pool_capacity=%d\n",
 257                            ppp_data.active_procs_in_pool * 100);
 258
 259                 h_pic(&pool_idle_time, &pool_procs);
 260                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 261                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 262         }
 263
 264         seq_printf(m, "unallocated_capacity_weight=%d\n",
 265                    ppp_data.unallocated_weight);
 266         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 267         seq_printf(m, "capped=%d\n", ppp_data.capped);
 268         seq_printf(m, "unallocated_capacity=%lld\n",
 269                    ppp_data.unallocated_entitlement);
 270 }
 271
 272 /**
 273  * parse_mpp_data
 274  * Parse out data returned from h_get_mpp
 275  */
 276 static void parse_mpp_data(struct seq_file *m)
 277 {
 278         struct hvcall_mpp_data mpp_data;
 279         int rc;
 280
 281         rc = h_get_mpp(&mpp_data);
 282         if (rc)
 283                 return;
 284
 285         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 286
 287         if (mpp_data.mapped_mem != -1)
 288                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 289                            mpp_data.mapped_mem);
 290
 291         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 292         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 293
 294         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 295         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 296                    mpp_data.unallocated_mem_weight);
 297         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 298                    mpp_data.unallocated_entitlement);
 299
 300         if (mpp_data.pool_size != -1)
 301                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 302                            mpp_data.pool_size);
 303
 304         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 305                    mpp_data.loan_request);
 306
 307         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 308 }
 309
 310 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 311 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 312
 313 /*
 314  * parse_system_parameter_string()
 315  * Retrieve the potential_processors, max_entitled_capacity and friends
 316  * through the get-system-parameter rtas call.  Replace keyword strings as
 317  * necessary.
 318  */
 319 static void parse_system_parameter_string(struct seq_file *m)
 320 {
 321         int call_status;
 322
 323         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 324         if (!local_buffer) {
 325                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 326                        __FILE__, __func__, __LINE__);
 327                 return;
 328         }
 329
 330         spin_lock(&rtas_data_buf_lock);
 331         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 332         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 333                                 NULL,
 334                                 SPLPAR_CHARACTERISTICS_TOKEN,
 335                                 __pa(rtas_data_buf),
 336                                 RTAS_DATA_BUF_SIZE);
 337         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 338         spin_unlock(&rtas_data_buf_lock);
 339
 340         if (call_status != 0) {
 341                 printk(KERN_INFO
 342                        "%s %s Error calling get-system-parameter (0x%x)\n",
 343                        __FILE__, __func__, call_status);
 344         } else {
 345                 int splpar_strlen;
 346                 int idx, w_idx;
 347                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 348                 if (!workbuffer) {
 349                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 350                                __FILE__, __func__, __LINE__);
 351                         kfree(local_buffer);
 352                         return;
 353                 }
 354 #ifdef LPARCFG_DEBUG
 355                 printk(KERN_INFO "success calling get-system-parameter \n");
 356 #endif
 357                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 358                 local_buffer += 2;      /* step over strlen value */
 359
 360                 w_idx = 0;
 361                 idx = 0;
 362                 while ((*local_buffer) && (idx < splpar_strlen)) {
 363                         workbuffer[w_idx++] = local_buffer[idx++];
 364                         if ((local_buffer[idx] == ',')
 365                             || (local_buffer[idx] == '\0')) {
 366                                 workbuffer[w_idx] = '\0';
 367                                 if (w_idx) {
 368                                         /* avoid the empty string */
 369                                         seq_printf(m, "%s\n", workbuffer);
 370                                 }
 371                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 372                                 idx++;  /* skip the comma */
 373                                 w_idx = 0;
 374                         } else if (local_buffer[idx] == '=') {
 375                                 /* code here to replace workbuffer contents
 376                                    with different keyword strings */
 377                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 378                                         strcpy(workbuffer,
 379                                                "partition_max_entitled_capacity");
 380                                         w_idx = strlen(workbuffer);
 381                                 }
 382                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 383                                         strcpy(workbuffer,
 384                                                "system_potential_processors");
 385                                         w_idx = strlen(workbuffer);
 386                                 }
 387                         }
 388                 }
 389                 kfree(workbuffer);
 390                 local_buffer -= 2;      /* back up over strlen value */
 391         }
 392         kfree(local_buffer);
 393 }
 394
 395 /* Return the number of processors in the system.
 396  * This function reads through the device tree and counts
 397  * the virtual processors, this does not include threads.
 398  */
 399 static int lparcfg_count_active_processors(void)
 400 {
 401         struct device_node *cpus_dn = NULL;
 402         int count = 0;
 403
 404         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 405 #ifdef LPARCFG_DEBUG
 406                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
 407 #endif
 408                 count++;
 409         }
 410         return count;
 411 }
 412
 413 static void pseries_cmo_data(struct seq_file *m)
 414 {
 415         int cpu;
 416         unsigned long cmo_faults = 0;
 417         unsigned long cmo_fault_time = 0;
 418
 419         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 420
 421         if (!firmware_has_feature(FW_FEATURE_CMO))
 422                 return;
 423
 424         for_each_possible_cpu(cpu) {
 425                 cmo_faults += lppaca[cpu].cmo_faults;
 426                 cmo_fault_time += lppaca[cpu].cmo_fault_time;
 427         }
 428
 429         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 430         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 431                    cmo_fault_time / tb_ticks_per_usec);
 432         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 433         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 434         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 435 }
 436
 437 static void splpar_dispatch_data(struct seq_file *m)
 438 {
 439         int cpu;
 440         unsigned long dispatches = 0;
 441         unsigned long dispatch_dispersions = 0;
 442
 443         for_each_possible_cpu(cpu) {
 444                 dispatches += lppaca[cpu].yield_count;
 445                 dispatch_dispersions += lppaca[cpu].dispersion_count;
 446         }
 447
 448         seq_printf(m, "dispatches=%lu\n", dispatches);
 449         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 450 }
 451
 452 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 453 {
 454         int partition_potential_processors;
 455         int partition_active_processors;
 456         struct device_node *rtas_node;
 457         const int *lrdrp = NULL;
 458
 459         rtas_node = of_find_node_by_path("/rtas");
 460         if (rtas_node)
 461                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 462
 463         if (lrdrp == NULL) {
 464                 partition_potential_processors = vdso_data->processorCount;
 465         } else {
 466                 partition_potential_processors = *(lrdrp + 4);
 467         }
 468         of_node_put(rtas_node);
 469
 470         partition_active_processors = lparcfg_count_active_processors();
 471
 472         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 473                 /* this call handles the ibm,get-system-parameter contents */
 474                 parse_system_parameter_string(m);
 475                 parse_ppp_data(m);
 476                 parse_mpp_data(m);
 477                 pseries_cmo_data(m);
 478                 splpar_dispatch_data(m);
 479
 480                 seq_printf(m, "purr=%ld\n", get_purr());
 481         } else {                /* non SPLPAR case */
 482
 483                 seq_printf(m, "system_active_processors=%d\n",
 484                            partition_potential_processors);
 485
 486                 seq_printf(m, "system_potential_processors=%d\n",
 487                            partition_potential_processors);
 488
 489                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 490                            partition_potential_processors * 100);
 491
 492                 seq_printf(m, "partition_entitled_capacity=%d\n",
 493                            partition_active_processors * 100);
 494         }
 495
 496         seq_printf(m, "partition_active_processors=%d\n",
 497                    partition_active_processors);
 498
 499         seq_printf(m, "partition_potential_processors=%d\n",
 500                    partition_potential_processors);
 501
 502         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 503
 504         return 0;
 505 }
 506
 507 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 508 {
 509         struct hvcall_ppp_data ppp_data;
 510         u8 new_weight;
 511         u64 new_entitled;
 512         ssize_t retval;
 513
 514         /* Get our current parameters */
 515         retval = h_get_ppp(&ppp_data);
 516         if (retval)
 517                 return retval;
 518
 519         if (entitlement) {
 520                 new_weight = ppp_data.weight;
 521                 new_entitled = *entitlement;
 522         } else if (weight) {
 523                 new_weight = *weight;
 524                 new_entitled = ppp_data.entitlement;
 525         } else
 526                 return -EINVAL;
 527
 528         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 529                  __func__, ppp_data.entitlement, ppp_data.weight);
 530
 531         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 532                  __func__, new_entitled, new_weight);
 533
 534         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 535         return retval;
 536 }
 537
 538 /**
 539  * update_mpp
 540  *
 541  * Update the memory entitlement and weight for the partition.  Caller must
 542  * specify either a new entitlement or weight, not both, to be updated
 543  * since the h_set_mpp call takes both entitlement and weight as parameters.
 544  */
 545 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 546 {
 547         struct hvcall_mpp_data mpp_data;
 548         u64 new_entitled;
 549         u8 new_weight;
 550         ssize_t rc;
 551
 552         if (entitlement) {
 553                 /* Check with vio to ensure the new memory entitlement
 554                  * can be handled.
 555                  */
 556                 rc = vio_cmo_entitlement_update(*entitlement);
 557                 if (rc)
 558                         return rc;
 559         }
 560
 561         rc = h_get_mpp(&mpp_data);
 562         if (rc)
 563                 return rc;
 564
 565         if (entitlement) {
 566                 new_weight = mpp_data.mem_weight;
 567                 new_entitled = *entitlement;
 568         } else if (weight) {
 569                 new_weight = *weight;
 570                 new_entitled = mpp_data.entitled_mem;
 571         } else
 572                 return -EINVAL;
 573
 574         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 575                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 576
 577         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 578                  __func__, new_entitled, new_weight);
 579
 580         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 581         return rc;
 582 }
 583
 584 /*
 585  * Interface for changing system parameters (variable capacity weight
 586  * and entitled capacity).  Format of input is "param_name=value";
 587  * anything after value is ignored.  Valid parameters at this time are
 588  * "partition_entitled_capacity" and "capacity_weight".  We use
 589  * H_SET_PPP to alter parameters.
 590  *
 591  * This function should be invoked only on systems with
 592  * FW_FEATURE_SPLPAR.
 593  */
 594 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 595                              size_t count, loff_t * off)
 596 {
 597         int kbuf_sz = 64;
 598         char kbuf[kbuf_sz];
 599         char *tmp;
 600         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 601         u8 new_weight, *new_weight_ptr = &new_weight;
 602         ssize_t retval;
 603
 604         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
 605                         firmware_has_feature(FW_FEATURE_ISERIES))
 606                 return -EINVAL;
 607
 608         if (count > kbuf_sz)
 609                 return -EINVAL;
 610
 611         if (copy_from_user(kbuf, buf, count))
 612                 return -EFAULT;
 613
 614         kbuf[count - 1] = '\0';
 615         tmp = strchr(kbuf, '=');
 616         if (!tmp)
 617                 return -EINVAL;
 618
 619         *tmp++ = '\0';
 620
 621         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 622                 char *endp;
 623                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 624                 if (endp == tmp)
 625                         return -EINVAL;
 626
 627                 retval = update_ppp(new_entitled_ptr, NULL);
 628         } else if (!strcmp(kbuf, "capacity_weight")) {
 629                 char *endp;
 630                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 631                 if (endp == tmp)
 632                         return -EINVAL;
 633
 634                 retval = update_ppp(NULL, new_weight_ptr);
 635         } else if (!strcmp(kbuf, "entitled_memory")) {
 636                 char *endp;
 637                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 638                 if (endp == tmp)
 639                         return -EINVAL;
 640
 641                 retval = update_mpp(new_entitled_ptr, NULL);
 642         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 643                 char *endp;
 644                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 645                 if (endp == tmp)
 646                         return -EINVAL;
 647
 648                 retval = update_mpp(NULL, new_weight_ptr);
 649         } else
 650                 return -EINVAL;
 651
 652         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 653                 retval = count;
 654         } else if (retval == H_BUSY) {
 655                 retval = -EBUSY;
 656         } else if (retval == H_HARDWARE) {
 657                 retval = -EIO;
 658         } else if (retval == H_PARAMETER) {
 659                 retval = -EINVAL;
 660         }
 661
 662         return retval;
 663 }
 664
 665 #else                           /* CONFIG_PPC_PSERIES */
 666
 667 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 668 {
 669         return 0;
 670 }
 671
 672 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 673                              size_t count, loff_t * off)
 674 {
 675         return -EINVAL;
 676 }
 677
 678 #endif                          /* CONFIG_PPC_PSERIES */
 679
 680 static int lparcfg_data(struct seq_file *m, void *v)
 681 {
 682         struct device_node *rootdn;
 683         const char *model = "";
 684         const char *system_id = "";
 685         const char *tmp;
 686         const unsigned int *lp_index_ptr;
 687         unsigned int lp_index = 0;
 688
 689         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 690
 691         rootdn = of_find_node_by_path("/");
 692         if (rootdn) {
 693                 tmp = of_get_property(rootdn, "model", NULL);
 694                 if (tmp) {
 695                         model = tmp;
 696                         /* Skip "IBM," - see platforms/iseries/dt.c */
 697                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 698                                 model += 4;
 699                 }
 700                 tmp = of_get_property(rootdn, "system-id", NULL);
 701                 if (tmp) {
 702                         system_id = tmp;
 703                         /* Skip "IBM," - see platforms/iseries/dt.c */
 704                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 705                                 system_id += 4;
 706                 }
 707                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 708                                         NULL);
 709                 if (lp_index_ptr)
 710                         lp_index = *lp_index_ptr;
 711                 of_node_put(rootdn);
 712         }
 713         seq_printf(m, "serial_number=%s\n", system_id);
 714         seq_printf(m, "system_type=%s\n", model);
 715         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 716
 717         if (firmware_has_feature(FW_FEATURE_ISERIES))
 718                 return iseries_lparcfg_data(m, v);
 719         return pseries_lparcfg_data(m, v);
 720 }
 721
 722 static int lparcfg_open(struct inode *inode, struct file *file)
 723 {
 724         return single_open(file, lparcfg_data, NULL);
 725 }
 726
 727 static const struct file_operations lparcfg_fops = {
 728         .owner          = THIS_MODULE,
 729         .read           = seq_read,
 730         .write          = lparcfg_write,
 731         .open           = lparcfg_open,
 732         .release        = single_release,
 733 };
 734
 735 static int __init lparcfg_init(void)
 736 {
 737         struct proc_dir_entry *ent;
 738         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 739
 740         /* Allow writing if we have FW_FEATURE_SPLPAR */
 741         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
 742                         !firmware_has_feature(FW_FEATURE_ISERIES))
 743                 mode |= S_IWUSR;
 744
 745         ent = proc_create("ppc64/lparcfg", mode, NULL, &lparcfg_fops);
 746         if (!ent) {
 747                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
 748                 return -EIO;
 749         }
 750
 751         proc_ppc64_lparcfg = ent;
 752         return 0;
 753 }
 754
 755 static void __exit lparcfg_cleanup(void)
 756 {
 757         if (proc_ppc64_lparcfg)
 758                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 759 }
 760
 761 module_init(lparcfg_init);
 762 module_exit(lparcfg_cleanup);
 763 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 764 MODULE_AUTHOR("Dave Engebretsen");
 765 MODULE_LICENSE("GPL");