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 #include <asm/mmu.h>
  39
  40 #define MODULE_VERS "1.8"
  41 #define MODULE_NAME "lparcfg"
  42
  43 /* #define LPARCFG_DEBUG */
  44
  45 static struct proc_dir_entry *proc_ppc64_lparcfg;
  46
  47 /*
  48  * Track sum of all purrs across all processors. This is used to further
  49  * calculate usage values by different applications
  50  */
  51 static unsigned long get_purr(void)
  52 {
  53         unsigned long sum_purr = 0;
  54         int cpu;
  55
  56         for_each_possible_cpu(cpu) {
  57                 if (firmware_has_feature(FW_FEATURE_ISERIES))
  58                         sum_purr += lppaca[cpu].emulated_time_base;
  59                 else {
  60                         struct cpu_usage *cu;
  61
  62                         cu = &per_cpu(cpu_usage_array, cpu);
  63                         sum_purr += cu->current_tb;
  64                 }
  65         }
  66         return sum_purr;
  67 }
  68
  69 #ifdef CONFIG_PPC_ISERIES
  70
  71 /*
  72  * Methods used to fetch LPAR data when running on an iSeries platform.
  73  */
  74 static int iseries_lparcfg_data(struct seq_file *m, void *v)
  75 {
  76         unsigned long pool_id;
  77         int shared, entitled_capacity, max_entitled_capacity;
  78         int processors, max_processors;
  79         unsigned long purr = get_purr();
  80
  81         shared = (int)(local_paca->lppaca_ptr->shared_proc);
  82
  83         seq_printf(m, "system_active_processors=%d\n",
  84                    (int)HvLpConfig_getSystemPhysicalProcessors());
  85
  86         seq_printf(m, "system_potential_processors=%d\n",
  87                    (int)HvLpConfig_getSystemPhysicalProcessors());
  88
  89         processors = (int)HvLpConfig_getPhysicalProcessors();
  90         seq_printf(m, "partition_active_processors=%d\n", processors);
  91
  92         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
  93         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
  94
  95         if (shared) {
  96                 entitled_capacity = HvLpConfig_getSharedProcUnits();
  97                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
  98         } else {
  99                 entitled_capacity = processors * 100;
 100                 max_entitled_capacity = max_processors * 100;
 101         }
 102         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
 103
 104         seq_printf(m, "partition_max_entitled_capacity=%d\n",
 105                    max_entitled_capacity);
 106
 107         if (shared) {
 108                 pool_id = HvLpConfig_getSharedPoolIndex();
 109                 seq_printf(m, "pool=%d\n", (int)pool_id);
 110                 seq_printf(m, "pool_capacity=%d\n",
 111                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
 112                                  100));
 113                 seq_printf(m, "purr=%ld\n", purr);
 114         }
 115
 116         seq_printf(m, "shared_processor_mode=%d\n", shared);
 117
 118         return 0;
 119 }
 120
 121 #else                           /* CONFIG_PPC_ISERIES */
 122
 123 static int iseries_lparcfg_data(struct seq_file *m, void *v)
 124 {
 125         return 0;
 126 }
 127
 128 #endif                          /* CONFIG_PPC_ISERIES */
 129
 130 #ifdef CONFIG_PPC_PSERIES
 131 /*
 132  * Methods used to fetch LPAR data when running on a pSeries platform.
 133  */
 134 /**
 135  * h_get_mpp
 136  * H_GET_MPP hcall returns info in 7 parms
 137  */
 138 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
 139 {
 140         int rc;
 141         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 142
 143         rc = plpar_hcall9(H_GET_MPP, retbuf);
 144
 145         mpp_data->entitled_mem = retbuf[0];
 146         mpp_data->mapped_mem = retbuf[1];
 147
 148         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 149         mpp_data->pool_num = retbuf[2] & 0xffff;
 150
 151         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
 152         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
 153         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffff;
 154
 155         mpp_data->pool_size = retbuf[4];
 156         mpp_data->loan_request = retbuf[5];
 157         mpp_data->backing_mem = retbuf[6];
 158
 159         return rc;
 160 }
 161 EXPORT_SYMBOL(h_get_mpp);
 162
 163 struct hvcall_ppp_data {
 164         u64     entitlement;
 165         u64     unallocated_entitlement;
 166         u16     group_num;
 167         u16     pool_num;
 168         u8      capped;
 169         u8      weight;
 170         u8      unallocated_weight;
 171         u16     active_procs_in_pool;
 172         u16     active_system_procs;
 173         u16     phys_platform_procs;
 174         u32     max_proc_cap_avail;
 175         u32     entitled_proc_cap_avail;
 176 };
 177
 178 /*
 179  * H_GET_PPP hcall returns info in 4 parms.
 180  *  entitled_capacity,unallocated_capacity,
 181  *  aggregation, resource_capability).
 182  *
 183  *  R4 = Entitled Processor Capacity Percentage.
 184  *  R5 = Unallocated Processor Capacity Percentage.
 185  *  R6 (AABBCCDDEEFFGGHH).
 186  *      XXXX - reserved (0)
 187  *          XXXX - reserved (0)
 188  *              XXXX - Group Number
 189  *                  XXXX - Pool Number.
 190  *  R7 (IIJJKKLLMMNNOOPP).
 191  *      XX - reserved. (0)
 192  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 193  *          XX - variable processor Capacity Weight
 194  *            XX - Unallocated Variable Processor Capacity Weight.
 195  *              XXXX - Active processors in Physical Processor Pool.
 196  *                  XXXX  - Processors active on platform.
 197  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
 198  *      XXXX - Physical platform procs allocated to virtualization.
 199  *          XXXXXX - Max procs capacity % available to the partitions pool.
 200  *                XXXXXX - Entitled procs capacity % available to the
 201  *                         partitions pool.
 202  */
 203 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 204 {
 205         unsigned long rc;
 206         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 207
 208         rc = plpar_hcall9(H_GET_PPP, retbuf);
 209
 210         ppp_data->entitlement = retbuf[0];
 211         ppp_data->unallocated_entitlement = retbuf[1];
 212
 213         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 214         ppp_data->pool_num = retbuf[2] & 0xffff;
 215
 216         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 217         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 218         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 219         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 220         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 221
 222         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
 223         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
 224         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
 225
 226         return rc;
 227 }
 228
 229 static unsigned h_pic(unsigned long *pool_idle_time,
 230                       unsigned long *num_procs)
 231 {
 232         unsigned long rc;
 233         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 234
 235         rc = plpar_hcall(H_PIC, retbuf);
 236
 237         *pool_idle_time = retbuf[0];
 238         *num_procs = retbuf[1];
 239
 240         return rc;
 241 }
 242
 243 /*
 244  * parse_ppp_data
 245  * Parse out the data returned from h_get_ppp and h_pic
 246  */
 247 static void parse_ppp_data(struct seq_file *m)
 248 {
 249         struct hvcall_ppp_data ppp_data;
 250         struct device_node *root;
 251         const int *perf_level;
 252         int rc;
 253
 254         rc = h_get_ppp(&ppp_data);
 255         if (rc)
 256                 return;
 257
 258         seq_printf(m, "partition_entitled_capacity=%lld\n",
 259                    ppp_data.entitlement);
 260         seq_printf(m, "group=%d\n", ppp_data.group_num);
 261         seq_printf(m, "system_active_processors=%d\n",
 262                    ppp_data.active_system_procs);
 263
 264         /* pool related entries are apropriate for shared configs */
 265         if (lppaca[0].shared_proc) {
 266                 unsigned long pool_idle_time, pool_procs;
 267
 268                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 269
 270                 /* report pool_capacity in percentage */
 271                 seq_printf(m, "pool_capacity=%d\n",
 272                            ppp_data.active_procs_in_pool * 100);
 273
 274                 h_pic(&pool_idle_time, &pool_procs);
 275                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 276                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 277         }
 278
 279         seq_printf(m, "unallocated_capacity_weight=%d\n",
 280                    ppp_data.unallocated_weight);
 281         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 282         seq_printf(m, "capped=%d\n", ppp_data.capped);
 283         seq_printf(m, "unallocated_capacity=%lld\n",
 284                    ppp_data.unallocated_entitlement);
 285
 286         /* The last bits of information returned from h_get_ppp are only
 287          * valid if the ibm,partition-performance-parameters-level
 288          * property is >= 1.
 289          */
 290         root = of_find_node_by_path("/");
 291         if (root) {
 292                 perf_level = of_get_property(root,
 293                                 "ibm,partition-performance-parameters-level",
 294                                              NULL);
 295                 if (perf_level && (*perf_level >= 1)) {
 296                         seq_printf(m,
 297                             "physical_procs_allocated_to_virtualization=%d\n",
 298                                    ppp_data.phys_platform_procs);
 299                         seq_printf(m, "max_proc_capacity_available=%d\n",
 300                                    ppp_data.max_proc_cap_avail);
 301                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 302                                    ppp_data.entitled_proc_cap_avail);
 303                 }
 304
 305                 of_node_put(root);
 306         }
 307 }
 308
 309 /**
 310  * parse_mpp_data
 311  * Parse out data returned from h_get_mpp
 312  */
 313 static void parse_mpp_data(struct seq_file *m)
 314 {
 315         struct hvcall_mpp_data mpp_data;
 316         int rc;
 317
 318         rc = h_get_mpp(&mpp_data);
 319         if (rc)
 320                 return;
 321
 322         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 323
 324         if (mpp_data.mapped_mem != -1)
 325                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 326                            mpp_data.mapped_mem);
 327
 328         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 329         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 330
 331         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 332         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 333                    mpp_data.unallocated_mem_weight);
 334         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 335                    mpp_data.unallocated_entitlement);
 336
 337         if (mpp_data.pool_size != -1)
 338                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 339                            mpp_data.pool_size);
 340
 341         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 342                    mpp_data.loan_request);
 343
 344         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 345 }
 346
 347 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 348 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 349
 350 /*
 351  * parse_system_parameter_string()
 352  * Retrieve the potential_processors, max_entitled_capacity and friends
 353  * through the get-system-parameter rtas call.  Replace keyword strings as
 354  * necessary.
 355  */
 356 static void parse_system_parameter_string(struct seq_file *m)
 357 {
 358         int call_status;
 359
 360         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 361         if (!local_buffer) {
 362                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 363                        __FILE__, __func__, __LINE__);
 364                 return;
 365         }
 366
 367         spin_lock(&rtas_data_buf_lock);
 368         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 369         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 370                                 NULL,
 371                                 SPLPAR_CHARACTERISTICS_TOKEN,
 372                                 __pa(rtas_data_buf),
 373                                 RTAS_DATA_BUF_SIZE);
 374         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 375         spin_unlock(&rtas_data_buf_lock);
 376
 377         if (call_status != 0) {
 378                 printk(KERN_INFO
 379                        "%s %s Error calling get-system-parameter (0x%x)\n",
 380                        __FILE__, __func__, call_status);
 381         } else {
 382                 int splpar_strlen;
 383                 int idx, w_idx;
 384                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 385                 if (!workbuffer) {
 386                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 387                                __FILE__, __func__, __LINE__);
 388                         kfree(local_buffer);
 389                         return;
 390                 }
 391 #ifdef LPARCFG_DEBUG
 392                 printk(KERN_INFO "success calling get-system-parameter \n");
 393 #endif
 394                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 395                 local_buffer += 2;      /* step over strlen value */
 396
 397                 w_idx = 0;
 398                 idx = 0;
 399                 while ((*local_buffer) && (idx < splpar_strlen)) {
 400                         workbuffer[w_idx++] = local_buffer[idx++];
 401                         if ((local_buffer[idx] == ',')
 402                             || (local_buffer[idx] == '\0')) {
 403                                 workbuffer[w_idx] = '\0';
 404                                 if (w_idx) {
 405                                         /* avoid the empty string */
 406                                         seq_printf(m, "%s\n", workbuffer);
 407                                 }
 408                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 409                                 idx++;  /* skip the comma */
 410                                 w_idx = 0;
 411                         } else if (local_buffer[idx] == '=') {
 412                                 /* code here to replace workbuffer contents
 413                                    with different keyword strings */
 414                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 415                                         strcpy(workbuffer,
 416                                                "partition_max_entitled_capacity");
 417                                         w_idx = strlen(workbuffer);
 418                                 }
 419                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 420                                         strcpy(workbuffer,
 421                                                "system_potential_processors");
 422                                         w_idx = strlen(workbuffer);
 423                                 }
 424                         }
 425                 }
 426                 kfree(workbuffer);
 427                 local_buffer -= 2;      /* back up over strlen value */
 428         }
 429         kfree(local_buffer);
 430 }
 431
 432 /* Return the number of processors in the system.
 433  * This function reads through the device tree and counts
 434  * the virtual processors, this does not include threads.
 435  */
 436 static int lparcfg_count_active_processors(void)
 437 {
 438         struct device_node *cpus_dn = NULL;
 439         int count = 0;
 440
 441         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 442 #ifdef LPARCFG_DEBUG
 443                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
 444 #endif
 445                 count++;
 446         }
 447         return count;
 448 }
 449
 450 static void pseries_cmo_data(struct seq_file *m)
 451 {
 452         int cpu;
 453         unsigned long cmo_faults = 0;
 454         unsigned long cmo_fault_time = 0;
 455
 456         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 457
 458         if (!firmware_has_feature(FW_FEATURE_CMO))
 459                 return;
 460
 461         for_each_possible_cpu(cpu) {
 462                 cmo_faults += lppaca[cpu].cmo_faults;
 463                 cmo_fault_time += lppaca[cpu].cmo_fault_time;
 464         }
 465
 466         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 467         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 468                    cmo_fault_time / tb_ticks_per_usec);
 469         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 470         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 471         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 472 }
 473
 474 static void splpar_dispatch_data(struct seq_file *m)
 475 {
 476         int cpu;
 477         unsigned long dispatches = 0;
 478         unsigned long dispatch_dispersions = 0;
 479
 480         for_each_possible_cpu(cpu) {
 481                 dispatches += lppaca[cpu].yield_count;
 482                 dispatch_dispersions += lppaca[cpu].dispersion_count;
 483         }
 484
 485         seq_printf(m, "dispatches=%lu\n", dispatches);
 486         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 487 }
 488
 489 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 490 {
 491         int partition_potential_processors;
 492         int partition_active_processors;
 493         struct device_node *rtas_node;
 494         const int *lrdrp = NULL;
 495
 496         rtas_node = of_find_node_by_path("/rtas");
 497         if (rtas_node)
 498                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 499
 500         if (lrdrp == NULL) {
 501                 partition_potential_processors = vdso_data->processorCount;
 502         } else {
 503                 partition_potential_processors = *(lrdrp + 4);
 504         }
 505         of_node_put(rtas_node);
 506
 507         partition_active_processors = lparcfg_count_active_processors();
 508
 509         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 510                 /* this call handles the ibm,get-system-parameter contents */
 511                 parse_system_parameter_string(m);
 512                 parse_ppp_data(m);
 513                 parse_mpp_data(m);
 514                 pseries_cmo_data(m);
 515                 splpar_dispatch_data(m);
 516
 517                 seq_printf(m, "purr=%ld\n", get_purr());
 518         } else {                /* non SPLPAR case */
 519
 520                 seq_printf(m, "system_active_processors=%d\n",
 521                            partition_potential_processors);
 522
 523                 seq_printf(m, "system_potential_processors=%d\n",
 524                            partition_potential_processors);
 525
 526                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 527                            partition_potential_processors * 100);
 528
 529                 seq_printf(m, "partition_entitled_capacity=%d\n",
 530                            partition_active_processors * 100);
 531         }
 532
 533         seq_printf(m, "partition_active_processors=%d\n",
 534                    partition_active_processors);
 535
 536         seq_printf(m, "partition_potential_processors=%d\n",
 537                    partition_potential_processors);
 538
 539         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 540
 541         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 542
 543         return 0;
 544 }
 545
 546 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 547 {
 548         struct hvcall_ppp_data ppp_data;
 549         u8 new_weight;
 550         u64 new_entitled;
 551         ssize_t retval;
 552
 553         /* Get our current parameters */
 554         retval = h_get_ppp(&ppp_data);
 555         if (retval)
 556                 return retval;
 557
 558         if (entitlement) {
 559                 new_weight = ppp_data.weight;
 560                 new_entitled = *entitlement;
 561         } else if (weight) {
 562                 new_weight = *weight;
 563                 new_entitled = ppp_data.entitlement;
 564         } else
 565                 return -EINVAL;
 566
 567         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 568                  __func__, ppp_data.entitlement, ppp_data.weight);
 569
 570         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 571                  __func__, new_entitled, new_weight);
 572
 573         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 574         return retval;
 575 }
 576
 577 /**
 578  * update_mpp
 579  *
 580  * Update the memory entitlement and weight for the partition.  Caller must
 581  * specify either a new entitlement or weight, not both, to be updated
 582  * since the h_set_mpp call takes both entitlement and weight as parameters.
 583  */
 584 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 585 {
 586         struct hvcall_mpp_data mpp_data;
 587         u64 new_entitled;
 588         u8 new_weight;
 589         ssize_t rc;
 590
 591         if (entitlement) {
 592                 /* Check with vio to ensure the new memory entitlement
 593                  * can be handled.
 594                  */
 595                 rc = vio_cmo_entitlement_update(*entitlement);
 596                 if (rc)
 597                         return rc;
 598         }
 599
 600         rc = h_get_mpp(&mpp_data);
 601         if (rc)
 602                 return rc;
 603
 604         if (entitlement) {
 605                 new_weight = mpp_data.mem_weight;
 606                 new_entitled = *entitlement;
 607         } else if (weight) {
 608                 new_weight = *weight;
 609                 new_entitled = mpp_data.entitled_mem;
 610         } else
 611                 return -EINVAL;
 612
 613         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 614                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 615
 616         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 617                  __func__, new_entitled, new_weight);
 618
 619         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 620         return rc;
 621 }
 622
 623 /*
 624  * Interface for changing system parameters (variable capacity weight
 625  * and entitled capacity).  Format of input is "param_name=value";
 626  * anything after value is ignored.  Valid parameters at this time are
 627  * "partition_entitled_capacity" and "capacity_weight".  We use
 628  * H_SET_PPP to alter parameters.
 629  *
 630  * This function should be invoked only on systems with
 631  * FW_FEATURE_SPLPAR.
 632  */
 633 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 634                              size_t count, loff_t * off)
 635 {
 636         int kbuf_sz = 64;
 637         char kbuf[kbuf_sz];
 638         char *tmp;
 639         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 640         u8 new_weight, *new_weight_ptr = &new_weight;
 641         ssize_t retval;
 642
 643         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
 644                         firmware_has_feature(FW_FEATURE_ISERIES))
 645                 return -EINVAL;
 646
 647         if (count > kbuf_sz)
 648                 return -EINVAL;
 649
 650         if (copy_from_user(kbuf, buf, count))
 651                 return -EFAULT;
 652
 653         kbuf[count - 1] = '\0';
 654         tmp = strchr(kbuf, '=');
 655         if (!tmp)
 656                 return -EINVAL;
 657
 658         *tmp++ = '\0';
 659
 660         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 661                 char *endp;
 662                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 663                 if (endp == tmp)
 664                         return -EINVAL;
 665
 666                 retval = update_ppp(new_entitled_ptr, NULL);
 667         } else if (!strcmp(kbuf, "capacity_weight")) {
 668                 char *endp;
 669                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 670                 if (endp == tmp)
 671                         return -EINVAL;
 672
 673                 retval = update_ppp(NULL, new_weight_ptr);
 674         } else if (!strcmp(kbuf, "entitled_memory")) {
 675                 char *endp;
 676                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 677                 if (endp == tmp)
 678                         return -EINVAL;
 679
 680                 retval = update_mpp(new_entitled_ptr, NULL);
 681         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 682                 char *endp;
 683                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 684                 if (endp == tmp)
 685                         return -EINVAL;
 686
 687                 retval = update_mpp(NULL, new_weight_ptr);
 688         } else
 689                 return -EINVAL;
 690
 691         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 692                 retval = count;
 693         } else if (retval == H_BUSY) {
 694                 retval = -EBUSY;
 695         } else if (retval == H_HARDWARE) {
 696                 retval = -EIO;
 697         } else if (retval == H_PARAMETER) {
 698                 retval = -EINVAL;
 699         }
 700
 701         return retval;
 702 }
 703
 704 #else                           /* CONFIG_PPC_PSERIES */
 705
 706 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 707 {
 708         return 0;
 709 }
 710
 711 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 712                              size_t count, loff_t * off)
 713 {
 714         return -EINVAL;
 715 }
 716
 717 #endif                          /* CONFIG_PPC_PSERIES */
 718
 719 static int lparcfg_data(struct seq_file *m, void *v)
 720 {
 721         struct device_node *rootdn;
 722         const char *model = "";
 723         const char *system_id = "";
 724         const char *tmp;
 725         const unsigned int *lp_index_ptr;
 726         unsigned int lp_index = 0;
 727
 728         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 729
 730         rootdn = of_find_node_by_path("/");
 731         if (rootdn) {
 732                 tmp = of_get_property(rootdn, "model", NULL);
 733                 if (tmp) {
 734                         model = tmp;
 735                         /* Skip "IBM," - see platforms/iseries/dt.c */
 736                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 737                                 model += 4;
 738                 }
 739                 tmp = of_get_property(rootdn, "system-id", NULL);
 740                 if (tmp) {
 741                         system_id = tmp;
 742                         /* Skip "IBM," - see platforms/iseries/dt.c */
 743                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 744                                 system_id += 4;
 745                 }
 746                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 747                                         NULL);
 748                 if (lp_index_ptr)
 749                         lp_index = *lp_index_ptr;
 750                 of_node_put(rootdn);
 751         }
 752         seq_printf(m, "serial_number=%s\n", system_id);
 753         seq_printf(m, "system_type=%s\n", model);
 754         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 755
 756         if (firmware_has_feature(FW_FEATURE_ISERIES))
 757                 return iseries_lparcfg_data(m, v);
 758         return pseries_lparcfg_data(m, v);
 759 }
 760
 761 static int lparcfg_open(struct inode *inode, struct file *file)
 762 {
 763         return single_open(file, lparcfg_data, NULL);
 764 }
 765
 766 static const struct file_operations lparcfg_fops = {
 767         .owner          = THIS_MODULE,
 768         .read           = seq_read,
 769         .write          = lparcfg_write,
 770         .open           = lparcfg_open,
 771         .release        = single_release,
 772 };
 773
 774 static int __init lparcfg_init(void)
 775 {
 776         struct proc_dir_entry *ent;
 777         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 778
 779         /* Allow writing if we have FW_FEATURE_SPLPAR */
 780         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
 781                         !firmware_has_feature(FW_FEATURE_ISERIES))
 782                 mode |= S_IWUSR;
 783
 784         ent = proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops);
 785         if (!ent) {
 786                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
 787                 return -EIO;
 788         }
 789
 790         proc_ppc64_lparcfg = ent;
 791         return 0;
 792 }
 793
 794 static void __exit lparcfg_cleanup(void)
 795 {
 796         if (proc_ppc64_lparcfg)
 797                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 798 }
 799
 800 module_init(lparcfg_init);
 801 module_exit(lparcfg_cleanup);
 802 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 803 MODULE_AUTHOR("Dave Engebretsen");
 804 MODULE_LICENSE("GPL");