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 <linux/slab.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/lppaca.h>
  30 #include <asm/hvcall.h>
  31 #include <asm/firmware.h>
  32 #include <asm/rtas.h>
  33 #include <asm/time.h>
  34 #include <asm/prom.h>
  35 #include <asm/vdso_datapage.h>
  36 #include <asm/vio.h>
  37 #include <asm/mmu.h>
  38
  39 #define MODULE_VERS "1.9"
  40 #define MODULE_NAME "lparcfg"
  41
  42 /* #define LPARCFG_DEBUG */
  43
  44 /*
  45  * Track sum of all purrs across all processors. This is used to further
  46  * calculate usage values by different applications
  47  */
  48 static unsigned long get_purr(void)
  49 {
  50         unsigned long sum_purr = 0;
  51         int cpu;
  52
  53         for_each_possible_cpu(cpu) {
  54                 struct cpu_usage *cu;
  55
  56                 cu = &per_cpu(cpu_usage_array, cpu);
  57                 sum_purr += cu->current_tb;
  58         }
  59         return sum_purr;
  60 }
  61
  62 /*
  63  * Methods used to fetch LPAR data when running on a pSeries platform.
  64  */
  65
  66 struct hvcall_ppp_data {
  67         u64     entitlement;
  68         u64     unallocated_entitlement;
  69         u16     group_num;
  70         u16     pool_num;
  71         u8      capped;
  72         u8      weight;
  73         u8      unallocated_weight;
  74         u16     active_procs_in_pool;
  75         u16     active_system_procs;
  76         u16     phys_platform_procs;
  77         u32     max_proc_cap_avail;
  78         u32     entitled_proc_cap_avail;
  79 };
  80
  81 /*
  82  * H_GET_PPP hcall returns info in 4 parms.
  83  *  entitled_capacity,unallocated_capacity,
  84  *  aggregation, resource_capability).
  85  *
  86  *  R4 = Entitled Processor Capacity Percentage.
  87  *  R5 = Unallocated Processor Capacity Percentage.
  88  *  R6 (AABBCCDDEEFFGGHH).
  89  *      XXXX - reserved (0)
  90  *          XXXX - reserved (0)
  91  *              XXXX - Group Number
  92  *                  XXXX - Pool Number.
  93  *  R7 (IIJJKKLLMMNNOOPP).
  94  *      XX - reserved. (0)
  95  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
  96  *          XX - variable processor Capacity Weight
  97  *            XX - Unallocated Variable Processor Capacity Weight.
  98  *              XXXX - Active processors in Physical Processor Pool.
  99  *                  XXXX  - Processors active on platform.
 100  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
 101  *      XXXX - Physical platform procs allocated to virtualization.
 102  *          XXXXXX - Max procs capacity % available to the partitions pool.
 103  *                XXXXXX - Entitled procs capacity % available to the
 104  *                         partitions pool.
 105  */
 106 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 107 {
 108         unsigned long rc;
 109         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 110
 111         rc = plpar_hcall9(H_GET_PPP, retbuf);
 112
 113         ppp_data->entitlement = retbuf[0];
 114         ppp_data->unallocated_entitlement = retbuf[1];
 115
 116         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 117         ppp_data->pool_num = retbuf[2] & 0xffff;
 118
 119         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 120         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 121         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 122         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 123         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 124
 125         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
 126         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
 127         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
 128
 129         return rc;
 130 }
 131
 132 static unsigned h_pic(unsigned long *pool_idle_time,
 133                       unsigned long *num_procs)
 134 {
 135         unsigned long rc;
 136         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 137
 138         rc = plpar_hcall(H_PIC, retbuf);
 139
 140         *pool_idle_time = retbuf[0];
 141         *num_procs = retbuf[1];
 142
 143         return rc;
 144 }
 145
 146 /*
 147  * parse_ppp_data
 148  * Parse out the data returned from h_get_ppp and h_pic
 149  */
 150 static void parse_ppp_data(struct seq_file *m)
 151 {
 152         struct hvcall_ppp_data ppp_data;
 153         struct device_node *root;
 154         const int *perf_level;
 155         int rc;
 156
 157         rc = h_get_ppp(&ppp_data);
 158         if (rc)
 159                 return;
 160
 161         seq_printf(m, "partition_entitled_capacity=%lld\n",
 162                    ppp_data.entitlement);
 163         seq_printf(m, "group=%d\n", ppp_data.group_num);
 164         seq_printf(m, "system_active_processors=%d\n",
 165                    ppp_data.active_system_procs);
 166
 167         /* pool related entries are appropriate for shared configs */
 168         if (lppaca_of(0).shared_proc) {
 169                 unsigned long pool_idle_time, pool_procs;
 170
 171                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 172
 173                 /* report pool_capacity in percentage */
 174                 seq_printf(m, "pool_capacity=%d\n",
 175                            ppp_data.active_procs_in_pool * 100);
 176
 177                 h_pic(&pool_idle_time, &pool_procs);
 178                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 179                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 180         }
 181
 182         seq_printf(m, "unallocated_capacity_weight=%d\n",
 183                    ppp_data.unallocated_weight);
 184         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 185         seq_printf(m, "capped=%d\n", ppp_data.capped);
 186         seq_printf(m, "unallocated_capacity=%lld\n",
 187                    ppp_data.unallocated_entitlement);
 188
 189         /* The last bits of information returned from h_get_ppp are only
 190          * valid if the ibm,partition-performance-parameters-level
 191          * property is >= 1.
 192          */
 193         root = of_find_node_by_path("/");
 194         if (root) {
 195                 perf_level = of_get_property(root,
 196                                 "ibm,partition-performance-parameters-level",
 197                                              NULL);
 198                 if (perf_level && (*perf_level >= 1)) {
 199                         seq_printf(m,
 200                             "physical_procs_allocated_to_virtualization=%d\n",
 201                                    ppp_data.phys_platform_procs);
 202                         seq_printf(m, "max_proc_capacity_available=%d\n",
 203                                    ppp_data.max_proc_cap_avail);
 204                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 205                                    ppp_data.entitled_proc_cap_avail);
 206                 }
 207
 208                 of_node_put(root);
 209         }
 210 }
 211
 212 /**
 213  * parse_mpp_data
 214  * Parse out data returned from h_get_mpp
 215  */
 216 static void parse_mpp_data(struct seq_file *m)
 217 {
 218         struct hvcall_mpp_data mpp_data;
 219         int rc;
 220
 221         rc = h_get_mpp(&mpp_data);
 222         if (rc)
 223                 return;
 224
 225         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 226
 227         if (mpp_data.mapped_mem != -1)
 228                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 229                            mpp_data.mapped_mem);
 230
 231         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 232         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 233
 234         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 235         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 236                    mpp_data.unallocated_mem_weight);
 237         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 238                    mpp_data.unallocated_entitlement);
 239
 240         if (mpp_data.pool_size != -1)
 241                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 242                            mpp_data.pool_size);
 243
 244         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 245                    mpp_data.loan_request);
 246
 247         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 248 }
 249
 250 /**
 251  * parse_mpp_x_data
 252  * Parse out data returned from h_get_mpp_x
 253  */
 254 static void parse_mpp_x_data(struct seq_file *m)
 255 {
 256         struct hvcall_mpp_x_data mpp_x_data;
 257
 258         if (!firmware_has_feature(FW_FEATURE_XCMO))
 259                 return;
 260         if (h_get_mpp_x(&mpp_x_data))
 261                 return;
 262
 263         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
 264
 265         if (mpp_x_data.pool_coalesced_bytes)
 266                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
 267                            mpp_x_data.pool_coalesced_bytes);
 268         if (mpp_x_data.pool_purr_cycles)
 269                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
 270         if (mpp_x_data.pool_spurr_cycles)
 271                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
 272 }
 273
 274 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 275 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 276
 277 /*
 278  * parse_system_parameter_string()
 279  * Retrieve the potential_processors, max_entitled_capacity and friends
 280  * through the get-system-parameter rtas call.  Replace keyword strings as
 281  * necessary.
 282  */
 283 static void parse_system_parameter_string(struct seq_file *m)
 284 {
 285         int call_status;
 286
 287         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 288         if (!local_buffer) {
 289                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 290                        __FILE__, __func__, __LINE__);
 291                 return;
 292         }
 293
 294         spin_lock(&rtas_data_buf_lock);
 295         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 296         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 297                                 NULL,
 298                                 SPLPAR_CHARACTERISTICS_TOKEN,
 299                                 __pa(rtas_data_buf),
 300                                 RTAS_DATA_BUF_SIZE);
 301         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 302         local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
 303         spin_unlock(&rtas_data_buf_lock);
 304
 305         if (call_status != 0) {
 306                 printk(KERN_INFO
 307                        "%s %s Error calling get-system-parameter (0x%x)\n",
 308                        __FILE__, __func__, call_status);
 309         } else {
 310                 int splpar_strlen;
 311                 int idx, w_idx;
 312                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 313                 if (!workbuffer) {
 314                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 315                                __FILE__, __func__, __LINE__);
 316                         kfree(local_buffer);
 317                         return;
 318                 }
 319 #ifdef LPARCFG_DEBUG
 320                 printk(KERN_INFO "success calling get-system-parameter\n");
 321 #endif
 322                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 323                 local_buffer += 2;      /* step over strlen value */
 324
 325                 w_idx = 0;
 326                 idx = 0;
 327                 while ((*local_buffer) && (idx < splpar_strlen)) {
 328                         workbuffer[w_idx++] = local_buffer[idx++];
 329                         if ((local_buffer[idx] == ',')
 330                             || (local_buffer[idx] == '\0')) {
 331                                 workbuffer[w_idx] = '\0';
 332                                 if (w_idx) {
 333                                         /* avoid the empty string */
 334                                         seq_printf(m, "%s\n", workbuffer);
 335                                 }
 336                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 337                                 idx++;  /* skip the comma */
 338                                 w_idx = 0;
 339                         } else if (local_buffer[idx] == '=') {
 340                                 /* code here to replace workbuffer contents
 341                                    with different keyword strings */
 342                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 343                                         strcpy(workbuffer,
 344                                                "partition_max_entitled_capacity");
 345                                         w_idx = strlen(workbuffer);
 346                                 }
 347                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 348                                         strcpy(workbuffer,
 349                                                "system_potential_processors");
 350                                         w_idx = strlen(workbuffer);
 351                                 }
 352                         }
 353                 }
 354                 kfree(workbuffer);
 355                 local_buffer -= 2;      /* back up over strlen value */
 356         }
 357         kfree(local_buffer);
 358 }
 359
 360 /* Return the number of processors in the system.
 361  * This function reads through the device tree and counts
 362  * the virtual processors, this does not include threads.
 363  */
 364 static int lparcfg_count_active_processors(void)
 365 {
 366         struct device_node *cpus_dn = NULL;
 367         int count = 0;
 368
 369         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 370 #ifdef LPARCFG_DEBUG
 371                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
 372 #endif
 373                 count++;
 374         }
 375         return count;
 376 }
 377
 378 static void pseries_cmo_data(struct seq_file *m)
 379 {
 380         int cpu;
 381         unsigned long cmo_faults = 0;
 382         unsigned long cmo_fault_time = 0;
 383
 384         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 385
 386         if (!firmware_has_feature(FW_FEATURE_CMO))
 387                 return;
 388
 389         for_each_possible_cpu(cpu) {
 390                 cmo_faults += lppaca_of(cpu).cmo_faults;
 391                 cmo_fault_time += lppaca_of(cpu).cmo_fault_time;
 392         }
 393
 394         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 395         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 396                    cmo_fault_time / tb_ticks_per_usec);
 397         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 398         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 399         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 400 }
 401
 402 static void splpar_dispatch_data(struct seq_file *m)
 403 {
 404         int cpu;
 405         unsigned long dispatches = 0;
 406         unsigned long dispatch_dispersions = 0;
 407
 408         for_each_possible_cpu(cpu) {
 409                 dispatches += lppaca_of(cpu).yield_count;
 410                 dispatch_dispersions += lppaca_of(cpu).dispersion_count;
 411         }
 412
 413         seq_printf(m, "dispatches=%lu\n", dispatches);
 414         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 415 }
 416
 417 static void parse_em_data(struct seq_file *m)
 418 {
 419         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 420
 421         if (plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
 422                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
 423 }
 424
 425 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 426 {
 427         int partition_potential_processors;
 428         int partition_active_processors;
 429         struct device_node *rtas_node;
 430         const int *lrdrp = NULL;
 431
 432         rtas_node = of_find_node_by_path("/rtas");
 433         if (rtas_node)
 434                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 435
 436         if (lrdrp == NULL) {
 437                 partition_potential_processors = vdso_data->processorCount;
 438         } else {
 439                 partition_potential_processors = *(lrdrp + 4);
 440         }
 441         of_node_put(rtas_node);
 442
 443         partition_active_processors = lparcfg_count_active_processors();
 444
 445         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 446                 /* this call handles the ibm,get-system-parameter contents */
 447                 parse_system_parameter_string(m);
 448                 parse_ppp_data(m);
 449                 parse_mpp_data(m);
 450                 parse_mpp_x_data(m);
 451                 pseries_cmo_data(m);
 452                 splpar_dispatch_data(m);
 453
 454                 seq_printf(m, "purr=%ld\n", get_purr());
 455         } else {                /* non SPLPAR case */
 456
 457                 seq_printf(m, "system_active_processors=%d\n",
 458                            partition_potential_processors);
 459
 460                 seq_printf(m, "system_potential_processors=%d\n",
 461                            partition_potential_processors);
 462
 463                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 464                            partition_potential_processors * 100);
 465
 466                 seq_printf(m, "partition_entitled_capacity=%d\n",
 467                            partition_active_processors * 100);
 468         }
 469
 470         seq_printf(m, "partition_active_processors=%d\n",
 471                    partition_active_processors);
 472
 473         seq_printf(m, "partition_potential_processors=%d\n",
 474                    partition_potential_processors);
 475
 476         seq_printf(m, "shared_processor_mode=%d\n", lppaca_of(0).shared_proc);
 477
 478         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 479
 480         parse_em_data(m);
 481
 482         return 0;
 483 }
 484
 485 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 486 {
 487         struct hvcall_ppp_data ppp_data;
 488         u8 new_weight;
 489         u64 new_entitled;
 490         ssize_t retval;
 491
 492         /* Get our current parameters */
 493         retval = h_get_ppp(&ppp_data);
 494         if (retval)
 495                 return retval;
 496
 497         if (entitlement) {
 498                 new_weight = ppp_data.weight;
 499                 new_entitled = *entitlement;
 500         } else if (weight) {
 501                 new_weight = *weight;
 502                 new_entitled = ppp_data.entitlement;
 503         } else
 504                 return -EINVAL;
 505
 506         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 507                  __func__, ppp_data.entitlement, ppp_data.weight);
 508
 509         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 510                  __func__, new_entitled, new_weight);
 511
 512         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 513         return retval;
 514 }
 515
 516 /**
 517  * update_mpp
 518  *
 519  * Update the memory entitlement and weight for the partition.  Caller must
 520  * specify either a new entitlement or weight, not both, to be updated
 521  * since the h_set_mpp call takes both entitlement and weight as parameters.
 522  */
 523 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 524 {
 525         struct hvcall_mpp_data mpp_data;
 526         u64 new_entitled;
 527         u8 new_weight;
 528         ssize_t rc;
 529
 530         if (entitlement) {
 531                 /* Check with vio to ensure the new memory entitlement
 532                  * can be handled.
 533                  */
 534                 rc = vio_cmo_entitlement_update(*entitlement);
 535                 if (rc)
 536                         return rc;
 537         }
 538
 539         rc = h_get_mpp(&mpp_data);
 540         if (rc)
 541                 return rc;
 542
 543         if (entitlement) {
 544                 new_weight = mpp_data.mem_weight;
 545                 new_entitled = *entitlement;
 546         } else if (weight) {
 547                 new_weight = *weight;
 548                 new_entitled = mpp_data.entitled_mem;
 549         } else
 550                 return -EINVAL;
 551
 552         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 553                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 554
 555         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 556                  __func__, new_entitled, new_weight);
 557
 558         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 559         return rc;
 560 }
 561
 562 /*
 563  * Interface for changing system parameters (variable capacity weight
 564  * and entitled capacity).  Format of input is "param_name=value";
 565  * anything after value is ignored.  Valid parameters at this time are
 566  * "partition_entitled_capacity" and "capacity_weight".  We use
 567  * H_SET_PPP to alter parameters.
 568  *
 569  * This function should be invoked only on systems with
 570  * FW_FEATURE_SPLPAR.
 571  */
 572 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 573                              size_t count, loff_t * off)
 574 {
 575         int kbuf_sz = 64;
 576         char kbuf[kbuf_sz];
 577         char *tmp;
 578         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 579         u8 new_weight, *new_weight_ptr = &new_weight;
 580         ssize_t retval;
 581
 582         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 583                 return -EINVAL;
 584
 585         if (count > kbuf_sz)
 586                 return -EINVAL;
 587
 588         if (copy_from_user(kbuf, buf, count))
 589                 return -EFAULT;
 590
 591         kbuf[count - 1] = '\0';
 592         tmp = strchr(kbuf, '=');
 593         if (!tmp)
 594                 return -EINVAL;
 595
 596         *tmp++ = '\0';
 597
 598         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 599                 char *endp;
 600                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 601                 if (endp == tmp)
 602                         return -EINVAL;
 603
 604                 retval = update_ppp(new_entitled_ptr, NULL);
 605         } else if (!strcmp(kbuf, "capacity_weight")) {
 606                 char *endp;
 607                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 608                 if (endp == tmp)
 609                         return -EINVAL;
 610
 611                 retval = update_ppp(NULL, new_weight_ptr);
 612         } else if (!strcmp(kbuf, "entitled_memory")) {
 613                 char *endp;
 614                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 615                 if (endp == tmp)
 616                         return -EINVAL;
 617
 618                 retval = update_mpp(new_entitled_ptr, NULL);
 619         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 620                 char *endp;
 621                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 622                 if (endp == tmp)
 623                         return -EINVAL;
 624
 625                 retval = update_mpp(NULL, new_weight_ptr);
 626         } else
 627                 return -EINVAL;
 628
 629         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 630                 retval = count;
 631         } else if (retval == H_BUSY) {
 632                 retval = -EBUSY;
 633         } else if (retval == H_HARDWARE) {
 634                 retval = -EIO;
 635         } else if (retval == H_PARAMETER) {
 636                 retval = -EINVAL;
 637         }
 638
 639         return retval;
 640 }
 641
 642 static int lparcfg_data(struct seq_file *m, void *v)
 643 {
 644         struct device_node *rootdn;
 645         const char *model = "";
 646         const char *system_id = "";
 647         const char *tmp;
 648         const unsigned int *lp_index_ptr;
 649         unsigned int lp_index = 0;
 650
 651         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
 652
 653         rootdn = of_find_node_by_path("/");
 654         if (rootdn) {
 655                 tmp = of_get_property(rootdn, "model", NULL);
 656                 if (tmp)
 657                         model = tmp;
 658                 tmp = of_get_property(rootdn, "system-id", NULL);
 659                 if (tmp)
 660                         system_id = tmp;
 661                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 662                                         NULL);
 663                 if (lp_index_ptr)
 664                         lp_index = *lp_index_ptr;
 665                 of_node_put(rootdn);
 666         }
 667         seq_printf(m, "serial_number=%s\n", system_id);
 668         seq_printf(m, "system_type=%s\n", model);
 669         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 670
 671         return pseries_lparcfg_data(m, v);
 672 }
 673
 674 static int lparcfg_open(struct inode *inode, struct file *file)
 675 {
 676         return single_open(file, lparcfg_data, NULL);
 677 }
 678
 679 static const struct file_operations lparcfg_fops = {
 680         .owner          = THIS_MODULE,
 681         .read           = seq_read,
 682         .write          = lparcfg_write,
 683         .open           = lparcfg_open,
 684         .release        = single_release,
 685         .llseek         = seq_lseek,
 686 };
 687
 688 static int __init lparcfg_init(void)
 689 {
 690         umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 691
 692         /* Allow writing if we have FW_FEATURE_SPLPAR */
 693         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 694                 mode |= S_IWUSR;
 695
 696         if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops)) {
 697                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
 698                 return -EIO;
 699         }
 700         return 0;
 701 }
 702
 703 static void __exit lparcfg_cleanup(void)
 704 {
 705         remove_proc_subtree("powerpc/lparcfg", NULL);
 706 }
 707
 708 module_init(lparcfg_init);
 709 module_exit(lparcfg_cleanup);
 710 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 711 MODULE_AUTHOR("Dave Engebretsen");
 712 MODULE_LICENSE("GPL");