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 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                 struct cpu_usage *cu;
  57
  58                 cu = &per_cpu(cpu_usage_array, cpu);
  59                 sum_purr += cu->current_tb;
  60         }
  61         return sum_purr;
  62 }
  63
  64 /*
  65  * Methods used to fetch LPAR data when running on a pSeries platform.
  66  */
  67
  68 struct hvcall_ppp_data {
  69         u64     entitlement;
  70         u64     unallocated_entitlement;
  71         u16     group_num;
  72         u16     pool_num;
  73         u8      capped;
  74         u8      weight;
  75         u8      unallocated_weight;
  76         u16     active_procs_in_pool;
  77         u16     active_system_procs;
  78         u16     phys_platform_procs;
  79         u32     max_proc_cap_avail;
  80         u32     entitled_proc_cap_avail;
  81 };
  82
  83 /*
  84  * H_GET_PPP hcall returns info in 4 parms.
  85  *  entitled_capacity,unallocated_capacity,
  86  *  aggregation, resource_capability).
  87  *
  88  *  R4 = Entitled Processor Capacity Percentage.
  89  *  R5 = Unallocated Processor Capacity Percentage.
  90  *  R6 (AABBCCDDEEFFGGHH).
  91  *      XXXX - reserved (0)
  92  *          XXXX - reserved (0)
  93  *              XXXX - Group Number
  94  *                  XXXX - Pool Number.
  95  *  R7 (IIJJKKLLMMNNOOPP).
  96  *      XX - reserved. (0)
  97  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
  98  *          XX - variable processor Capacity Weight
  99  *            XX - Unallocated Variable Processor Capacity Weight.
 100  *              XXXX - Active processors in Physical Processor Pool.
 101  *                  XXXX  - Processors active on platform.
 102  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
 103  *      XXXX - Physical platform procs allocated to virtualization.
 104  *          XXXXXX - Max procs capacity % available to the partitions pool.
 105  *                XXXXXX - Entitled procs capacity % available to the
 106  *                         partitions pool.
 107  */
 108 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 109 {
 110         unsigned long rc;
 111         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 112
 113         rc = plpar_hcall9(H_GET_PPP, retbuf);
 114
 115         ppp_data->entitlement = retbuf[0];
 116         ppp_data->unallocated_entitlement = retbuf[1];
 117
 118         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 119         ppp_data->pool_num = retbuf[2] & 0xffff;
 120
 121         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 122         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 123         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 124         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 125         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 126
 127         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
 128         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
 129         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
 130
 131         return rc;
 132 }
 133
 134 static unsigned h_pic(unsigned long *pool_idle_time,
 135                       unsigned long *num_procs)
 136 {
 137         unsigned long rc;
 138         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 139
 140         rc = plpar_hcall(H_PIC, retbuf);
 141
 142         *pool_idle_time = retbuf[0];
 143         *num_procs = retbuf[1];
 144
 145         return rc;
 146 }
 147
 148 /*
 149  * parse_ppp_data
 150  * Parse out the data returned from h_get_ppp and h_pic
 151  */
 152 static void parse_ppp_data(struct seq_file *m)
 153 {
 154         struct hvcall_ppp_data ppp_data;
 155         struct device_node *root;
 156         const int *perf_level;
 157         int rc;
 158
 159         rc = h_get_ppp(&ppp_data);
 160         if (rc)
 161                 return;
 162
 163         seq_printf(m, "partition_entitled_capacity=%lld\n",
 164                    ppp_data.entitlement);
 165         seq_printf(m, "group=%d\n", ppp_data.group_num);
 166         seq_printf(m, "system_active_processors=%d\n",
 167                    ppp_data.active_system_procs);
 168
 169         /* pool related entries are appropriate for shared configs */
 170         if (lppaca_of(0).shared_proc) {
 171                 unsigned long pool_idle_time, pool_procs;
 172
 173                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 174
 175                 /* report pool_capacity in percentage */
 176                 seq_printf(m, "pool_capacity=%d\n",
 177                            ppp_data.active_procs_in_pool * 100);
 178
 179                 h_pic(&pool_idle_time, &pool_procs);
 180                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 181                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 182         }
 183
 184         seq_printf(m, "unallocated_capacity_weight=%d\n",
 185                    ppp_data.unallocated_weight);
 186         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 187         seq_printf(m, "capped=%d\n", ppp_data.capped);
 188         seq_printf(m, "unallocated_capacity=%lld\n",
 189                    ppp_data.unallocated_entitlement);
 190
 191         /* The last bits of information returned from h_get_ppp are only
 192          * valid if the ibm,partition-performance-parameters-level
 193          * property is >= 1.
 194          */
 195         root = of_find_node_by_path("/");
 196         if (root) {
 197                 perf_level = of_get_property(root,
 198                                 "ibm,partition-performance-parameters-level",
 199                                              NULL);
 200                 if (perf_level && (*perf_level >= 1)) {
 201                         seq_printf(m,
 202                             "physical_procs_allocated_to_virtualization=%d\n",
 203                                    ppp_data.phys_platform_procs);
 204                         seq_printf(m, "max_proc_capacity_available=%d\n",
 205                                    ppp_data.max_proc_cap_avail);
 206                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 207                                    ppp_data.entitled_proc_cap_avail);
 208                 }
 209
 210                 of_node_put(root);
 211         }
 212 }
 213
 214 /**
 215  * parse_mpp_data
 216  * Parse out data returned from h_get_mpp
 217  */
 218 static void parse_mpp_data(struct seq_file *m)
 219 {
 220         struct hvcall_mpp_data mpp_data;
 221         int rc;
 222
 223         rc = h_get_mpp(&mpp_data);
 224         if (rc)
 225                 return;
 226
 227         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 228
 229         if (mpp_data.mapped_mem != -1)
 230                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 231                            mpp_data.mapped_mem);
 232
 233         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 234         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 235
 236         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 237         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 238                    mpp_data.unallocated_mem_weight);
 239         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 240                    mpp_data.unallocated_entitlement);
 241
 242         if (mpp_data.pool_size != -1)
 243                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 244                            mpp_data.pool_size);
 245
 246         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 247                    mpp_data.loan_request);
 248
 249         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 250 }
 251
 252 /**
 253  * parse_mpp_x_data
 254  * Parse out data returned from h_get_mpp_x
 255  */
 256 static void parse_mpp_x_data(struct seq_file *m)
 257 {
 258         struct hvcall_mpp_x_data mpp_x_data;
 259
 260         if (!firmware_has_feature(FW_FEATURE_XCMO))
 261                 return;
 262         if (h_get_mpp_x(&mpp_x_data))
 263                 return;
 264
 265         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
 266
 267         if (mpp_x_data.pool_coalesced_bytes)
 268                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
 269                            mpp_x_data.pool_coalesced_bytes);
 270         if (mpp_x_data.pool_purr_cycles)
 271                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
 272         if (mpp_x_data.pool_spurr_cycles)
 273                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
 274 }
 275
 276 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 277 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 278
 279 /*
 280  * parse_system_parameter_string()
 281  * Retrieve the potential_processors, max_entitled_capacity and friends
 282  * through the get-system-parameter rtas call.  Replace keyword strings as
 283  * necessary.
 284  */
 285 static void parse_system_parameter_string(struct seq_file *m)
 286 {
 287         int call_status;
 288
 289         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 290         if (!local_buffer) {
 291                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 292                        __FILE__, __func__, __LINE__);
 293                 return;
 294         }
 295
 296         spin_lock(&rtas_data_buf_lock);
 297         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 298         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 299                                 NULL,
 300                                 SPLPAR_CHARACTERISTICS_TOKEN,
 301                                 __pa(rtas_data_buf),
 302                                 RTAS_DATA_BUF_SIZE);
 303         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 304         spin_unlock(&rtas_data_buf_lock);
 305
 306         if (call_status != 0) {
 307                 printk(KERN_INFO
 308                        "%s %s Error calling get-system-parameter (0x%x)\n",
 309                        __FILE__, __func__, call_status);
 310         } else {
 311                 int splpar_strlen;
 312                 int idx, w_idx;
 313                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 314                 if (!workbuffer) {
 315                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 316                                __FILE__, __func__, __LINE__);
 317                         kfree(local_buffer);
 318                         return;
 319                 }
 320 #ifdef LPARCFG_DEBUG
 321                 printk(KERN_INFO "success calling get-system-parameter\n");
 322 #endif
 323                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 324                 local_buffer += 2;      /* step over strlen value */
 325
 326                 w_idx = 0;
 327                 idx = 0;
 328                 while ((*local_buffer) && (idx < splpar_strlen)) {
 329                         workbuffer[w_idx++] = local_buffer[idx++];
 330                         if ((local_buffer[idx] == ',')
 331                             || (local_buffer[idx] == '\0')) {
 332                                 workbuffer[w_idx] = '\0';
 333                                 if (w_idx) {
 334                                         /* avoid the empty string */
 335                                         seq_printf(m, "%s\n", workbuffer);
 336                                 }
 337                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 338                                 idx++;  /* skip the comma */
 339                                 w_idx = 0;
 340                         } else if (local_buffer[idx] == '=') {
 341                                 /* code here to replace workbuffer contents
 342                                    with different keyword strings */
 343                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 344                                         strcpy(workbuffer,
 345                                                "partition_max_entitled_capacity");
 346                                         w_idx = strlen(workbuffer);
 347                                 }
 348                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 349                                         strcpy(workbuffer,
 350                                                "system_potential_processors");
 351                                         w_idx = strlen(workbuffer);
 352                                 }
 353                         }
 354                 }
 355                 kfree(workbuffer);
 356                 local_buffer -= 2;      /* back up over strlen value */
 357         }
 358         kfree(local_buffer);
 359 }
 360
 361 /* Return the number of processors in the system.
 362  * This function reads through the device tree and counts
 363  * the virtual processors, this does not include threads.
 364  */
 365 static int lparcfg_count_active_processors(void)
 366 {
 367         struct device_node *cpus_dn = NULL;
 368         int count = 0;
 369
 370         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 371 #ifdef LPARCFG_DEBUG
 372                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
 373 #endif
 374                 count++;
 375         }
 376         return count;
 377 }
 378
 379 static void pseries_cmo_data(struct seq_file *m)
 380 {
 381         int cpu;
 382         unsigned long cmo_faults = 0;
 383         unsigned long cmo_fault_time = 0;
 384
 385         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 386
 387         if (!firmware_has_feature(FW_FEATURE_CMO))
 388                 return;
 389
 390         for_each_possible_cpu(cpu) {
 391                 cmo_faults += lppaca_of(cpu).cmo_faults;
 392                 cmo_fault_time += lppaca_of(cpu).cmo_fault_time;
 393         }
 394
 395         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 396         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 397                    cmo_fault_time / tb_ticks_per_usec);
 398         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 399         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 400         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 401 }
 402
 403 static void splpar_dispatch_data(struct seq_file *m)
 404 {
 405         int cpu;
 406         unsigned long dispatches = 0;
 407         unsigned long dispatch_dispersions = 0;
 408
 409         for_each_possible_cpu(cpu) {
 410                 dispatches += lppaca_of(cpu).yield_count;
 411                 dispatch_dispersions += lppaca_of(cpu).dispersion_count;
 412         }
 413
 414         seq_printf(m, "dispatches=%lu\n", dispatches);
 415         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 416 }
 417
 418 static void parse_em_data(struct seq_file *m)
 419 {
 420         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 421
 422         if (plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
 423                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
 424 }
 425
 426 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 427 {
 428         int partition_potential_processors;
 429         int partition_active_processors;
 430         struct device_node *rtas_node;
 431         const int *lrdrp = NULL;
 432
 433         rtas_node = of_find_node_by_path("/rtas");
 434         if (rtas_node)
 435                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 436
 437         if (lrdrp == NULL) {
 438                 partition_potential_processors = vdso_data->processorCount;
 439         } else {
 440                 partition_potential_processors = *(lrdrp + 4);
 441         }
 442         of_node_put(rtas_node);
 443
 444         partition_active_processors = lparcfg_count_active_processors();
 445
 446         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 447                 /* this call handles the ibm,get-system-parameter contents */
 448                 parse_system_parameter_string(m);
 449                 parse_ppp_data(m);
 450                 parse_mpp_data(m);
 451                 parse_mpp_x_data(m);
 452                 pseries_cmo_data(m);
 453                 splpar_dispatch_data(m);
 454
 455                 seq_printf(m, "purr=%ld\n", get_purr());
 456         } else {                /* non SPLPAR case */
 457
 458                 seq_printf(m, "system_active_processors=%d\n",
 459                            partition_potential_processors);
 460
 461                 seq_printf(m, "system_potential_processors=%d\n",
 462                            partition_potential_processors);
 463
 464                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 465                            partition_potential_processors * 100);
 466
 467                 seq_printf(m, "partition_entitled_capacity=%d\n",
 468                            partition_active_processors * 100);
 469         }
 470
 471         seq_printf(m, "partition_active_processors=%d\n",
 472                    partition_active_processors);
 473
 474         seq_printf(m, "partition_potential_processors=%d\n",
 475                    partition_potential_processors);
 476
 477         seq_printf(m, "shared_processor_mode=%d\n", lppaca_of(0).shared_proc);
 478
 479         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 480
 481         parse_em_data(m);
 482
 483         return 0;
 484 }
 485
 486 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 487 {
 488         struct hvcall_ppp_data ppp_data;
 489         u8 new_weight;
 490         u64 new_entitled;
 491         ssize_t retval;
 492
 493         /* Get our current parameters */
 494         retval = h_get_ppp(&ppp_data);
 495         if (retval)
 496                 return retval;
 497
 498         if (entitlement) {
 499                 new_weight = ppp_data.weight;
 500                 new_entitled = *entitlement;
 501         } else if (weight) {
 502                 new_weight = *weight;
 503                 new_entitled = ppp_data.entitlement;
 504         } else
 505                 return -EINVAL;
 506
 507         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 508                  __func__, ppp_data.entitlement, ppp_data.weight);
 509
 510         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 511                  __func__, new_entitled, new_weight);
 512
 513         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 514         return retval;
 515 }
 516
 517 /**
 518  * update_mpp
 519  *
 520  * Update the memory entitlement and weight for the partition.  Caller must
 521  * specify either a new entitlement or weight, not both, to be updated
 522  * since the h_set_mpp call takes both entitlement and weight as parameters.
 523  */
 524 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 525 {
 526         struct hvcall_mpp_data mpp_data;
 527         u64 new_entitled;
 528         u8 new_weight;
 529         ssize_t rc;
 530
 531         if (entitlement) {
 532                 /* Check with vio to ensure the new memory entitlement
 533                  * can be handled.
 534                  */
 535                 rc = vio_cmo_entitlement_update(*entitlement);
 536                 if (rc)
 537                         return rc;
 538         }
 539
 540         rc = h_get_mpp(&mpp_data);
 541         if (rc)
 542                 return rc;
 543
 544         if (entitlement) {
 545                 new_weight = mpp_data.mem_weight;
 546                 new_entitled = *entitlement;
 547         } else if (weight) {
 548                 new_weight = *weight;
 549                 new_entitled = mpp_data.entitled_mem;
 550         } else
 551                 return -EINVAL;
 552
 553         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 554                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 555
 556         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 557                  __func__, new_entitled, new_weight);
 558
 559         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 560         return rc;
 561 }
 562
 563 /*
 564  * Interface for changing system parameters (variable capacity weight
 565  * and entitled capacity).  Format of input is "param_name=value";
 566  * anything after value is ignored.  Valid parameters at this time are
 567  * "partition_entitled_capacity" and "capacity_weight".  We use
 568  * H_SET_PPP to alter parameters.
 569  *
 570  * This function should be invoked only on systems with
 571  * FW_FEATURE_SPLPAR.
 572  */
 573 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 574                              size_t count, loff_t * off)
 575 {
 576         int kbuf_sz = 64;
 577         char kbuf[kbuf_sz];
 578         char *tmp;
 579         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 580         u8 new_weight, *new_weight_ptr = &new_weight;
 581         ssize_t retval;
 582
 583         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 584                 return -EINVAL;
 585
 586         if (count > kbuf_sz)
 587                 return -EINVAL;
 588
 589         if (copy_from_user(kbuf, buf, count))
 590                 return -EFAULT;
 591
 592         kbuf[count - 1] = '\0';
 593         tmp = strchr(kbuf, '=');
 594         if (!tmp)
 595                 return -EINVAL;
 596
 597         *tmp++ = '\0';
 598
 599         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 600                 char *endp;
 601                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 602                 if (endp == tmp)
 603                         return -EINVAL;
 604
 605                 retval = update_ppp(new_entitled_ptr, NULL);
 606         } else if (!strcmp(kbuf, "capacity_weight")) {
 607                 char *endp;
 608                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 609                 if (endp == tmp)
 610                         return -EINVAL;
 611
 612                 retval = update_ppp(NULL, new_weight_ptr);
 613         } else if (!strcmp(kbuf, "entitled_memory")) {
 614                 char *endp;
 615                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 616                 if (endp == tmp)
 617                         return -EINVAL;
 618
 619                 retval = update_mpp(new_entitled_ptr, NULL);
 620         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 621                 char *endp;
 622                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 623                 if (endp == tmp)
 624                         return -EINVAL;
 625
 626                 retval = update_mpp(NULL, new_weight_ptr);
 627         } else
 628                 return -EINVAL;
 629
 630         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 631                 retval = count;
 632         } else if (retval == H_BUSY) {
 633                 retval = -EBUSY;
 634         } else if (retval == H_HARDWARE) {
 635                 retval = -EIO;
 636         } else if (retval == H_PARAMETER) {
 637                 retval = -EINVAL;
 638         }
 639
 640         return retval;
 641 }
 642
 643 static int lparcfg_data(struct seq_file *m, void *v)
 644 {
 645         struct device_node *rootdn;
 646         const char *model = "";
 647         const char *system_id = "";
 648         const char *tmp;
 649         const unsigned int *lp_index_ptr;
 650         unsigned int lp_index = 0;
 651
 652         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
 653
 654         rootdn = of_find_node_by_path("/");
 655         if (rootdn) {
 656                 tmp = of_get_property(rootdn, "model", NULL);
 657                 if (tmp)
 658                         model = tmp;
 659                 tmp = of_get_property(rootdn, "system-id", NULL);
 660                 if (tmp)
 661                         system_id = tmp;
 662                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 663                                         NULL);
 664                 if (lp_index_ptr)
 665                         lp_index = *lp_index_ptr;
 666                 of_node_put(rootdn);
 667         }
 668         seq_printf(m, "serial_number=%s\n", system_id);
 669         seq_printf(m, "system_type=%s\n", model);
 670         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 671
 672         return pseries_lparcfg_data(m, v);
 673 }
 674
 675 static int lparcfg_open(struct inode *inode, struct file *file)
 676 {
 677         return single_open(file, lparcfg_data, NULL);
 678 }
 679
 680 static const struct file_operations lparcfg_fops = {
 681         .owner          = THIS_MODULE,
 682         .read           = seq_read,
 683         .write          = lparcfg_write,
 684         .open           = lparcfg_open,
 685         .release        = single_release,
 686         .llseek         = seq_lseek,
 687 };
 688
 689 static int __init lparcfg_init(void)
 690 {
 691         struct proc_dir_entry *ent;
 692         umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 693
 694         /* Allow writing if we have FW_FEATURE_SPLPAR */
 695         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 696                 mode |= S_IWUSR;
 697
 698         ent = proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops);
 699         if (!ent) {
 700                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
 701                 return -EIO;
 702         }
 703
 704         proc_ppc64_lparcfg = ent;
 705         return 0;
 706 }
 707
 708 static void __exit lparcfg_cleanup(void)
 709 {
 710         if (proc_ppc64_lparcfg)
 711                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 712 }
 713
 714 module_init(lparcfg_init);
 715 module_exit(lparcfg_cleanup);
 716 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 717 MODULE_AUTHOR("Dave Engebretsen");
 718 MODULE_LICENSE("GPL");