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/iseries/hv_lp_config.h>
  30 #include <asm/lppaca.h>
  31 #include <asm/hvcall.h>
  32 #include <asm/firmware.h>
  33 #include <asm/rtas.h>
  34 #include <asm/system.h>
  35 #include <asm/time.h>
  36 #include <asm/prom.h>
  37 #include <asm/vdso_datapage.h>
  38 #include <asm/vio.h>
  39 #include <asm/mmu.h>
  40
  41 #define MODULE_VERS "1.9"
  42 #define MODULE_NAME "lparcfg"
  43
  44 /* #define LPARCFG_DEBUG */
  45
  46 static struct proc_dir_entry *proc_ppc64_lparcfg;
  47
  48 /*
  49  * Track sum of all purrs across all processors. This is used to further
  50  * calculate usage values by different applications
  51  */
  52 static unsigned long get_purr(void)
  53 {
  54         unsigned long sum_purr = 0;
  55         int cpu;
  56
  57         for_each_possible_cpu(cpu) {
  58                 if (firmware_has_feature(FW_FEATURE_ISERIES))
  59                         sum_purr += lppaca_of(cpu).emulated_time_base;
  60                 else {
  61                         struct cpu_usage *cu;
  62
  63                         cu = &per_cpu(cpu_usage_array, cpu);
  64                         sum_purr += cu->current_tb;
  65                 }
  66         }
  67         return sum_purr;
  68 }
  69
  70 #ifdef CONFIG_PPC_ISERIES
  71
  72 /*
  73  * Methods used to fetch LPAR data when running on an iSeries platform.
  74  */
  75 static int iseries_lparcfg_data(struct seq_file *m, void *v)
  76 {
  77         unsigned long pool_id;
  78         int shared, entitled_capacity, max_entitled_capacity;
  79         int processors, max_processors;
  80         unsigned long purr = get_purr();
  81
  82         shared = (int)(local_paca->lppaca_ptr->shared_proc);
  83
  84         seq_printf(m, "system_active_processors=%d\n",
  85                    (int)HvLpConfig_getSystemPhysicalProcessors());
  86
  87         seq_printf(m, "system_potential_processors=%d\n",
  88                    (int)HvLpConfig_getSystemPhysicalProcessors());
  89
  90         processors = (int)HvLpConfig_getPhysicalProcessors();
  91         seq_printf(m, "partition_active_processors=%d\n", processors);
  92
  93         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
  94         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
  95
  96         if (shared) {
  97                 entitled_capacity = HvLpConfig_getSharedProcUnits();
  98                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
  99         } else {
 100                 entitled_capacity = processors * 100;
 101                 max_entitled_capacity = max_processors * 100;
 102         }
 103         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
 104
 105         seq_printf(m, "partition_max_entitled_capacity=%d\n",
 106                    max_entitled_capacity);
 107
 108         if (shared) {
 109                 pool_id = HvLpConfig_getSharedPoolIndex();
 110                 seq_printf(m, "pool=%d\n", (int)pool_id);
 111                 seq_printf(m, "pool_capacity=%d\n",
 112                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
 113                                  100));
 114                 seq_printf(m, "purr=%ld\n", purr);
 115         }
 116
 117         seq_printf(m, "shared_processor_mode=%d\n", shared);
 118
 119         return 0;
 120 }
 121
 122 #else                           /* CONFIG_PPC_ISERIES */
 123
 124 static int iseries_lparcfg_data(struct seq_file *m, void *v)
 125 {
 126         return 0;
 127 }
 128
 129 #endif                          /* CONFIG_PPC_ISERIES */
 130
 131 #ifdef CONFIG_PPC_PSERIES
 132 /*
 133  * Methods used to fetch LPAR data when running on a pSeries platform.
 134  */
 135
 136 struct hvcall_ppp_data {
 137         u64     entitlement;
 138         u64     unallocated_entitlement;
 139         u16     group_num;
 140         u16     pool_num;
 141         u8      capped;
 142         u8      weight;
 143         u8      unallocated_weight;
 144         u16     active_procs_in_pool;
 145         u16     active_system_procs;
 146         u16     phys_platform_procs;
 147         u32     max_proc_cap_avail;
 148         u32     entitled_proc_cap_avail;
 149 };
 150
 151 /*
 152  * H_GET_PPP hcall returns info in 4 parms.
 153  *  entitled_capacity,unallocated_capacity,
 154  *  aggregation, resource_capability).
 155  *
 156  *  R4 = Entitled Processor Capacity Percentage.
 157  *  R5 = Unallocated Processor Capacity Percentage.
 158  *  R6 (AABBCCDDEEFFGGHH).
 159  *      XXXX - reserved (0)
 160  *          XXXX - reserved (0)
 161  *              XXXX - Group Number
 162  *                  XXXX - Pool Number.
 163  *  R7 (IIJJKKLLMMNNOOPP).
 164  *      XX - reserved. (0)
 165  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 166  *          XX - variable processor Capacity Weight
 167  *            XX - Unallocated Variable Processor Capacity Weight.
 168  *              XXXX - Active processors in Physical Processor Pool.
 169  *                  XXXX  - Processors active on platform.
 170  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
 171  *      XXXX - Physical platform procs allocated to virtualization.
 172  *          XXXXXX - Max procs capacity % available to the partitions pool.
 173  *                XXXXXX - Entitled procs capacity % available to the
 174  *                         partitions pool.
 175  */
 176 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 177 {
 178         unsigned long rc;
 179         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 180
 181         rc = plpar_hcall9(H_GET_PPP, retbuf);
 182
 183         ppp_data->entitlement = retbuf[0];
 184         ppp_data->unallocated_entitlement = retbuf[1];
 185
 186         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 187         ppp_data->pool_num = retbuf[2] & 0xffff;
 188
 189         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 190         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 191         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 192         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 193         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 194
 195         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
 196         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
 197         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
 198
 199         return rc;
 200 }
 201
 202 static unsigned h_pic(unsigned long *pool_idle_time,
 203                       unsigned long *num_procs)
 204 {
 205         unsigned long rc;
 206         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 207
 208         rc = plpar_hcall(H_PIC, retbuf);
 209
 210         *pool_idle_time = retbuf[0];
 211         *num_procs = retbuf[1];
 212
 213         return rc;
 214 }
 215
 216 /*
 217  * parse_ppp_data
 218  * Parse out the data returned from h_get_ppp and h_pic
 219  */
 220 static void parse_ppp_data(struct seq_file *m)
 221 {
 222         struct hvcall_ppp_data ppp_data;
 223         struct device_node *root;
 224         const int *perf_level;
 225         int rc;
 226
 227         rc = h_get_ppp(&ppp_data);
 228         if (rc)
 229                 return;
 230
 231         seq_printf(m, "partition_entitled_capacity=%lld\n",
 232                    ppp_data.entitlement);
 233         seq_printf(m, "group=%d\n", ppp_data.group_num);
 234         seq_printf(m, "system_active_processors=%d\n",
 235                    ppp_data.active_system_procs);
 236
 237         /* pool related entries are appropriate for shared configs */
 238         if (lppaca_of(0).shared_proc) {
 239                 unsigned long pool_idle_time, pool_procs;
 240
 241                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 242
 243                 /* report pool_capacity in percentage */
 244                 seq_printf(m, "pool_capacity=%d\n",
 245                            ppp_data.active_procs_in_pool * 100);
 246
 247                 h_pic(&pool_idle_time, &pool_procs);
 248                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 249                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 250         }
 251
 252         seq_printf(m, "unallocated_capacity_weight=%d\n",
 253                    ppp_data.unallocated_weight);
 254         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 255         seq_printf(m, "capped=%d\n", ppp_data.capped);
 256         seq_printf(m, "unallocated_capacity=%lld\n",
 257                    ppp_data.unallocated_entitlement);
 258
 259         /* The last bits of information returned from h_get_ppp are only
 260          * valid if the ibm,partition-performance-parameters-level
 261          * property is >= 1.
 262          */
 263         root = of_find_node_by_path("/");
 264         if (root) {
 265                 perf_level = of_get_property(root,
 266                                 "ibm,partition-performance-parameters-level",
 267                                              NULL);
 268                 if (perf_level && (*perf_level >= 1)) {
 269                         seq_printf(m,
 270                             "physical_procs_allocated_to_virtualization=%d\n",
 271                                    ppp_data.phys_platform_procs);
 272                         seq_printf(m, "max_proc_capacity_available=%d\n",
 273                                    ppp_data.max_proc_cap_avail);
 274                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 275                                    ppp_data.entitled_proc_cap_avail);
 276                 }
 277
 278                 of_node_put(root);
 279         }
 280 }
 281
 282 /**
 283  * parse_mpp_data
 284  * Parse out data returned from h_get_mpp
 285  */
 286 static void parse_mpp_data(struct seq_file *m)
 287 {
 288         struct hvcall_mpp_data mpp_data;
 289         int rc;
 290
 291         rc = h_get_mpp(&mpp_data);
 292         if (rc)
 293                 return;
 294
 295         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 296
 297         if (mpp_data.mapped_mem != -1)
 298                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 299                            mpp_data.mapped_mem);
 300
 301         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 302         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 303
 304         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 305         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 306                    mpp_data.unallocated_mem_weight);
 307         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 308                    mpp_data.unallocated_entitlement);
 309
 310         if (mpp_data.pool_size != -1)
 311                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 312                            mpp_data.pool_size);
 313
 314         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 315                    mpp_data.loan_request);
 316
 317         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 318 }
 319
 320 /**
 321  * parse_mpp_x_data
 322  * Parse out data returned from h_get_mpp_x
 323  */
 324 static void parse_mpp_x_data(struct seq_file *m)
 325 {
 326         struct hvcall_mpp_x_data mpp_x_data;
 327
 328         if (!firmware_has_feature(FW_FEATURE_XCMO))
 329                 return;
 330         if (h_get_mpp_x(&mpp_x_data))
 331                 return;
 332
 333         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
 334
 335         if (mpp_x_data.pool_coalesced_bytes)
 336                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
 337                            mpp_x_data.pool_coalesced_bytes);
 338         if (mpp_x_data.pool_purr_cycles)
 339                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
 340         if (mpp_x_data.pool_spurr_cycles)
 341                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
 342 }
 343
 344 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 345 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 346
 347 /*
 348  * parse_system_parameter_string()
 349  * Retrieve the potential_processors, max_entitled_capacity and friends
 350  * through the get-system-parameter rtas call.  Replace keyword strings as
 351  * necessary.
 352  */
 353 static void parse_system_parameter_string(struct seq_file *m)
 354 {
 355         int call_status;
 356
 357         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 358         if (!local_buffer) {
 359                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 360                        __FILE__, __func__, __LINE__);
 361                 return;
 362         }
 363
 364         spin_lock(&rtas_data_buf_lock);
 365         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 366         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 367                                 NULL,
 368                                 SPLPAR_CHARACTERISTICS_TOKEN,
 369                                 __pa(rtas_data_buf),
 370                                 RTAS_DATA_BUF_SIZE);
 371         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 372         spin_unlock(&rtas_data_buf_lock);
 373
 374         if (call_status != 0) {
 375                 printk(KERN_INFO
 376                        "%s %s Error calling get-system-parameter (0x%x)\n",
 377                        __FILE__, __func__, call_status);
 378         } else {
 379                 int splpar_strlen;
 380                 int idx, w_idx;
 381                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 382                 if (!workbuffer) {
 383                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 384                                __FILE__, __func__, __LINE__);
 385                         kfree(local_buffer);
 386                         return;
 387                 }
 388 #ifdef LPARCFG_DEBUG
 389                 printk(KERN_INFO "success calling get-system-parameter\n");
 390 #endif
 391                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 392                 local_buffer += 2;      /* step over strlen value */
 393
 394                 w_idx = 0;
 395                 idx = 0;
 396                 while ((*local_buffer) && (idx < splpar_strlen)) {
 397                         workbuffer[w_idx++] = local_buffer[idx++];
 398                         if ((local_buffer[idx] == ',')
 399                             || (local_buffer[idx] == '\0')) {
 400                                 workbuffer[w_idx] = '\0';
 401                                 if (w_idx) {
 402                                         /* avoid the empty string */
 403                                         seq_printf(m, "%s\n", workbuffer);
 404                                 }
 405                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 406                                 idx++;  /* skip the comma */
 407                                 w_idx = 0;
 408                         } else if (local_buffer[idx] == '=') {
 409                                 /* code here to replace workbuffer contents
 410                                    with different keyword strings */
 411                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 412                                         strcpy(workbuffer,
 413                                                "partition_max_entitled_capacity");
 414                                         w_idx = strlen(workbuffer);
 415                                 }
 416                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 417                                         strcpy(workbuffer,
 418                                                "system_potential_processors");
 419                                         w_idx = strlen(workbuffer);
 420                                 }
 421                         }
 422                 }
 423                 kfree(workbuffer);
 424                 local_buffer -= 2;      /* back up over strlen value */
 425         }
 426         kfree(local_buffer);
 427 }
 428
 429 /* Return the number of processors in the system.
 430  * This function reads through the device tree and counts
 431  * the virtual processors, this does not include threads.
 432  */
 433 static int lparcfg_count_active_processors(void)
 434 {
 435         struct device_node *cpus_dn = NULL;
 436         int count = 0;
 437
 438         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 439 #ifdef LPARCFG_DEBUG
 440                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
 441 #endif
 442                 count++;
 443         }
 444         return count;
 445 }
 446
 447 static void pseries_cmo_data(struct seq_file *m)
 448 {
 449         int cpu;
 450         unsigned long cmo_faults = 0;
 451         unsigned long cmo_fault_time = 0;
 452
 453         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 454
 455         if (!firmware_has_feature(FW_FEATURE_CMO))
 456                 return;
 457
 458         for_each_possible_cpu(cpu) {
 459                 cmo_faults += lppaca_of(cpu).cmo_faults;
 460                 cmo_fault_time += lppaca_of(cpu).cmo_fault_time;
 461         }
 462
 463         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 464         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 465                    cmo_fault_time / tb_ticks_per_usec);
 466         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 467         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 468         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 469 }
 470
 471 static void splpar_dispatch_data(struct seq_file *m)
 472 {
 473         int cpu;
 474         unsigned long dispatches = 0;
 475         unsigned long dispatch_dispersions = 0;
 476
 477         for_each_possible_cpu(cpu) {
 478                 dispatches += lppaca_of(cpu).yield_count;
 479                 dispatch_dispersions += lppaca_of(cpu).dispersion_count;
 480         }
 481
 482         seq_printf(m, "dispatches=%lu\n", dispatches);
 483         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 484 }
 485
 486 static void parse_em_data(struct seq_file *m)
 487 {
 488         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 489
 490         if (plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
 491                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
 492 }
 493
 494 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 495 {
 496         int partition_potential_processors;
 497         int partition_active_processors;
 498         struct device_node *rtas_node;
 499         const int *lrdrp = NULL;
 500
 501         rtas_node = of_find_node_by_path("/rtas");
 502         if (rtas_node)
 503                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 504
 505         if (lrdrp == NULL) {
 506                 partition_potential_processors = vdso_data->processorCount;
 507         } else {
 508                 partition_potential_processors = *(lrdrp + 4);
 509         }
 510         of_node_put(rtas_node);
 511
 512         partition_active_processors = lparcfg_count_active_processors();
 513
 514         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 515                 /* this call handles the ibm,get-system-parameter contents */
 516                 parse_system_parameter_string(m);
 517                 parse_ppp_data(m);
 518                 parse_mpp_data(m);
 519                 parse_mpp_x_data(m);
 520                 pseries_cmo_data(m);
 521                 splpar_dispatch_data(m);
 522
 523                 seq_printf(m, "purr=%ld\n", get_purr());
 524         } else {                /* non SPLPAR case */
 525
 526                 seq_printf(m, "system_active_processors=%d\n",
 527                            partition_potential_processors);
 528
 529                 seq_printf(m, "system_potential_processors=%d\n",
 530                            partition_potential_processors);
 531
 532                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 533                            partition_potential_processors * 100);
 534
 535                 seq_printf(m, "partition_entitled_capacity=%d\n",
 536                            partition_active_processors * 100);
 537         }
 538
 539         seq_printf(m, "partition_active_processors=%d\n",
 540                    partition_active_processors);
 541
 542         seq_printf(m, "partition_potential_processors=%d\n",
 543                    partition_potential_processors);
 544
 545         seq_printf(m, "shared_processor_mode=%d\n", lppaca_of(0).shared_proc);
 546
 547         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 548
 549         parse_em_data(m);
 550
 551         return 0;
 552 }
 553
 554 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 555 {
 556         struct hvcall_ppp_data ppp_data;
 557         u8 new_weight;
 558         u64 new_entitled;
 559         ssize_t retval;
 560
 561         /* Get our current parameters */
 562         retval = h_get_ppp(&ppp_data);
 563         if (retval)
 564                 return retval;
 565
 566         if (entitlement) {
 567                 new_weight = ppp_data.weight;
 568                 new_entitled = *entitlement;
 569         } else if (weight) {
 570                 new_weight = *weight;
 571                 new_entitled = ppp_data.entitlement;
 572         } else
 573                 return -EINVAL;
 574
 575         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 576                  __func__, ppp_data.entitlement, ppp_data.weight);
 577
 578         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 579                  __func__, new_entitled, new_weight);
 580
 581         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 582         return retval;
 583 }
 584
 585 /**
 586  * update_mpp
 587  *
 588  * Update the memory entitlement and weight for the partition.  Caller must
 589  * specify either a new entitlement or weight, not both, to be updated
 590  * since the h_set_mpp call takes both entitlement and weight as parameters.
 591  */
 592 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 593 {
 594         struct hvcall_mpp_data mpp_data;
 595         u64 new_entitled;
 596         u8 new_weight;
 597         ssize_t rc;
 598
 599         if (entitlement) {
 600                 /* Check with vio to ensure the new memory entitlement
 601                  * can be handled.
 602                  */
 603                 rc = vio_cmo_entitlement_update(*entitlement);
 604                 if (rc)
 605                         return rc;
 606         }
 607
 608         rc = h_get_mpp(&mpp_data);
 609         if (rc)
 610                 return rc;
 611
 612         if (entitlement) {
 613                 new_weight = mpp_data.mem_weight;
 614                 new_entitled = *entitlement;
 615         } else if (weight) {
 616                 new_weight = *weight;
 617                 new_entitled = mpp_data.entitled_mem;
 618         } else
 619                 return -EINVAL;
 620
 621         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 622                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 623
 624         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 625                  __func__, new_entitled, new_weight);
 626
 627         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 628         return rc;
 629 }
 630
 631 /*
 632  * Interface for changing system parameters (variable capacity weight
 633  * and entitled capacity).  Format of input is "param_name=value";
 634  * anything after value is ignored.  Valid parameters at this time are
 635  * "partition_entitled_capacity" and "capacity_weight".  We use
 636  * H_SET_PPP to alter parameters.
 637  *
 638  * This function should be invoked only on systems with
 639  * FW_FEATURE_SPLPAR.
 640  */
 641 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 642                              size_t count, loff_t * off)
 643 {
 644         int kbuf_sz = 64;
 645         char kbuf[kbuf_sz];
 646         char *tmp;
 647         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 648         u8 new_weight, *new_weight_ptr = &new_weight;
 649         ssize_t retval;
 650
 651         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
 652                         firmware_has_feature(FW_FEATURE_ISERIES))
 653                 return -EINVAL;
 654
 655         if (count > kbuf_sz)
 656                 return -EINVAL;
 657
 658         if (copy_from_user(kbuf, buf, count))
 659                 return -EFAULT;
 660
 661         kbuf[count - 1] = '\0';
 662         tmp = strchr(kbuf, '=');
 663         if (!tmp)
 664                 return -EINVAL;
 665
 666         *tmp++ = '\0';
 667
 668         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 669                 char *endp;
 670                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 671                 if (endp == tmp)
 672                         return -EINVAL;
 673
 674                 retval = update_ppp(new_entitled_ptr, NULL);
 675         } else if (!strcmp(kbuf, "capacity_weight")) {
 676                 char *endp;
 677                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 678                 if (endp == tmp)
 679                         return -EINVAL;
 680
 681                 retval = update_ppp(NULL, new_weight_ptr);
 682         } else if (!strcmp(kbuf, "entitled_memory")) {
 683                 char *endp;
 684                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 685                 if (endp == tmp)
 686                         return -EINVAL;
 687
 688                 retval = update_mpp(new_entitled_ptr, NULL);
 689         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 690                 char *endp;
 691                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 692                 if (endp == tmp)
 693                         return -EINVAL;
 694
 695                 retval = update_mpp(NULL, new_weight_ptr);
 696         } else
 697                 return -EINVAL;
 698
 699         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 700                 retval = count;
 701         } else if (retval == H_BUSY) {
 702                 retval = -EBUSY;
 703         } else if (retval == H_HARDWARE) {
 704                 retval = -EIO;
 705         } else if (retval == H_PARAMETER) {
 706                 retval = -EINVAL;
 707         }
 708
 709         return retval;
 710 }
 711
 712 #else                           /* CONFIG_PPC_PSERIES */
 713
 714 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 715 {
 716         return 0;
 717 }
 718
 719 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 720                              size_t count, loff_t * off)
 721 {
 722         return -EINVAL;
 723 }
 724
 725 #endif                          /* CONFIG_PPC_PSERIES */
 726
 727 static int lparcfg_data(struct seq_file *m, void *v)
 728 {
 729         struct device_node *rootdn;
 730         const char *model = "";
 731         const char *system_id = "";
 732         const char *tmp;
 733         const unsigned int *lp_index_ptr;
 734         unsigned int lp_index = 0;
 735
 736         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
 737
 738         rootdn = of_find_node_by_path("/");
 739         if (rootdn) {
 740                 tmp = of_get_property(rootdn, "model", NULL);
 741                 if (tmp) {
 742                         model = tmp;
 743                         /* Skip "IBM," - see platforms/iseries/dt.c */
 744                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 745                                 model += 4;
 746                 }
 747                 tmp = of_get_property(rootdn, "system-id", NULL);
 748                 if (tmp) {
 749                         system_id = tmp;
 750                         /* Skip "IBM," - see platforms/iseries/dt.c */
 751                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 752                                 system_id += 4;
 753                 }
 754                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 755                                         NULL);
 756                 if (lp_index_ptr)
 757                         lp_index = *lp_index_ptr;
 758                 of_node_put(rootdn);
 759         }
 760         seq_printf(m, "serial_number=%s\n", system_id);
 761         seq_printf(m, "system_type=%s\n", model);
 762         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 763
 764         if (firmware_has_feature(FW_FEATURE_ISERIES))
 765                 return iseries_lparcfg_data(m, v);
 766         return pseries_lparcfg_data(m, v);
 767 }
 768
 769 static int lparcfg_open(struct inode *inode, struct file *file)
 770 {
 771         return single_open(file, lparcfg_data, NULL);
 772 }
 773
 774 static const struct file_operations lparcfg_fops = {
 775         .owner          = THIS_MODULE,
 776         .read           = seq_read,
 777         .write          = lparcfg_write,
 778         .open           = lparcfg_open,
 779         .release        = single_release,
 780         .llseek         = seq_lseek,
 781 };
 782
 783 static int __init lparcfg_init(void)
 784 {
 785         struct proc_dir_entry *ent;
 786         umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 787
 788         /* Allow writing if we have FW_FEATURE_SPLPAR */
 789         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
 790                         !firmware_has_feature(FW_FEATURE_ISERIES))
 791                 mode |= S_IWUSR;
 792
 793         ent = proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops);
 794         if (!ent) {
 795                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
 796                 return -EIO;
 797         }
 798
 799         proc_ppc64_lparcfg = ent;
 800         return 0;
 801 }
 802
 803 static void __exit lparcfg_cleanup(void)
 804 {
 805         if (proc_ppc64_lparcfg)
 806                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 807 }
 808
 809 module_init(lparcfg_init);
 810 module_exit(lparcfg_cleanup);
 811 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 812 MODULE_AUTHOR("Dave Engebretsen");
 813 MODULE_LICENSE("GPL");