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   1 /*
   2  * PowerPC64 LPAR Configuration Information Driver
   3  *
   4  * Dave Engebretsen engebret@us.ibm.com
   5  *    Copyright (c) 2003 Dave Engebretsen
   6  * Will Schmidt willschm@us.ibm.com
   7  *    SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
   8  *    seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
   9  * Nathan Lynch nathanl@austin.ibm.com
  10  *    Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  * This driver creates a proc file at /proc/ppc64/lparcfg which contains
  18  * keyword - value pairs that specify the configuration of the partition.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/errno.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/init.h>
  26 #include <linux/seq_file.h>
  27 #include <asm/uaccess.h>
  28 #include <asm/iseries/hv_lp_config.h>
  29 #include <asm/lppaca.h>
  30 #include <asm/hvcall.h>
  31 #include <asm/firmware.h>
  32 #include <asm/rtas.h>
  33 #include <asm/system.h>
  34 #include <asm/time.h>
  35 #include <asm/prom.h>
  36 #include <asm/vdso_datapage.h>
  37 #include <asm/vio.h>
  38
  39 #define MODULE_VERS "1.8"
  40 #define MODULE_NAME "lparcfg"
  41
  42 /* #define LPARCFG_DEBUG */
  43
  44 static struct proc_dir_entry *proc_ppc64_lparcfg;
  45
  46 /*
  47  * Track sum of all purrs across all processors. This is used to further
  48  * calculate usage values by different applications
  49  */
  50 static unsigned long get_purr(void)
  51 {
  52         unsigned long sum_purr = 0;
  53         int cpu;
  54
  55         for_each_possible_cpu(cpu) {
  56                 if (firmware_has_feature(FW_FEATURE_ISERIES))
  57                         sum_purr += lppaca[cpu].emulated_time_base;
  58                 else {
  59                         struct cpu_usage *cu;
  60
  61                         cu = &per_cpu(cpu_usage_array, cpu);
  62                         sum_purr += cu->current_tb;
  63                 }
  64         }
  65         return sum_purr;
  66 }
  67
  68 #ifdef CONFIG_PPC_ISERIES
  69
  70 /*
  71  * Methods used to fetch LPAR data when running on an iSeries platform.
  72  */
  73 static int iseries_lparcfg_data(struct seq_file *m, void *v)
  74 {
  75         unsigned long pool_id;
  76         int shared, entitled_capacity, max_entitled_capacity;
  77         int processors, max_processors;
  78         unsigned long purr = get_purr();
  79
  80         shared = (int)(local_paca->lppaca_ptr->shared_proc);
  81
  82         seq_printf(m, "system_active_processors=%d\n",
  83                    (int)HvLpConfig_getSystemPhysicalProcessors());
  84
  85         seq_printf(m, "system_potential_processors=%d\n",
  86                    (int)HvLpConfig_getSystemPhysicalProcessors());
  87
  88         processors = (int)HvLpConfig_getPhysicalProcessors();
  89         seq_printf(m, "partition_active_processors=%d\n", processors);
  90
  91         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
  92         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
  93
  94         if (shared) {
  95                 entitled_capacity = HvLpConfig_getSharedProcUnits();
  96                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
  97         } else {
  98                 entitled_capacity = processors * 100;
  99                 max_entitled_capacity = max_processors * 100;
 100         }
 101         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
 102
 103         seq_printf(m, "partition_max_entitled_capacity=%d\n",
 104                    max_entitled_capacity);
 105
 106         if (shared) {
 107                 pool_id = HvLpConfig_getSharedPoolIndex();
 108                 seq_printf(m, "pool=%d\n", (int)pool_id);
 109                 seq_printf(m, "pool_capacity=%d\n",
 110                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
 111                                  100));
 112                 seq_printf(m, "purr=%ld\n", purr);
 113         }
 114
 115         seq_printf(m, "shared_processor_mode=%d\n", shared);
 116
 117         return 0;
 118 }
 119
 120 #else                           /* CONFIG_PPC_ISERIES */
 121
 122 static int iseries_lparcfg_data(struct seq_file *m, void *v)
 123 {
 124         return 0;
 125 }
 126
 127 #endif                          /* CONFIG_PPC_ISERIES */
 128
 129 #ifdef CONFIG_PPC_PSERIES
 130 /*
 131  * Methods used to fetch LPAR data when running on a pSeries platform.
 132  */
 133 /**
 134  * h_get_mpp
 135  * H_GET_MPP hcall returns info in 7 parms
 136  */
 137 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
 138 {
 139         int rc;
 140         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 141
 142         rc = plpar_hcall9(H_GET_MPP, retbuf);
 143
 144         mpp_data->entitled_mem = retbuf[0];
 145         mpp_data->mapped_mem = retbuf[1];
 146
 147         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 148         mpp_data->pool_num = retbuf[2] & 0xffff;
 149
 150         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
 151         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
 152         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffff;
 153
 154         mpp_data->pool_size = retbuf[4];
 155         mpp_data->loan_request = retbuf[5];
 156         mpp_data->backing_mem = retbuf[6];
 157
 158         return rc;
 159 }
 160 EXPORT_SYMBOL(h_get_mpp);
 161
 162 struct hvcall_ppp_data {
 163         u64     entitlement;
 164         u64     unallocated_entitlement;
 165         u16     group_num;
 166         u16     pool_num;
 167         u8      capped;
 168         u8      weight;
 169         u8      unallocated_weight;
 170         u16     active_procs_in_pool;
 171         u16     active_system_procs;
 172         u16     phys_platform_procs;
 173         u32     max_proc_cap_avail;
 174         u32     entitled_proc_cap_avail;
 175 };
 176
 177 /*
 178  * H_GET_PPP hcall returns info in 4 parms.
 179  *  entitled_capacity,unallocated_capacity,
 180  *  aggregation, resource_capability).
 181  *
 182  *  R4 = Entitled Processor Capacity Percentage.
 183  *  R5 = Unallocated Processor Capacity Percentage.
 184  *  R6 (AABBCCDDEEFFGGHH).
 185  *      XXXX - reserved (0)
 186  *          XXXX - reserved (0)
 187  *              XXXX - Group Number
 188  *                  XXXX - Pool Number.
 189  *  R7 (IIJJKKLLMMNNOOPP).
 190  *      XX - reserved. (0)
 191  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 192  *          XX - variable processor Capacity Weight
 193  *            XX - Unallocated Variable Processor Capacity Weight.
 194  *              XXXX - Active processors in Physical Processor Pool.
 195  *                  XXXX  - Processors active on platform.
 196  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
 197  *      XXXX - Physical platform procs allocated to virtualization.
 198  *          XXXXXX - Max procs capacity % available to the partitions pool.
 199  *                XXXXXX - Entitled procs capacity % available to the
 200  *                         partitions pool.
 201  */
 202 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 203 {
 204         unsigned long rc;
 205         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 206
 207         rc = plpar_hcall9(H_GET_PPP, retbuf);
 208
 209         ppp_data->entitlement = retbuf[0];
 210         ppp_data->unallocated_entitlement = retbuf[1];
 211
 212         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 213         ppp_data->pool_num = retbuf[2] & 0xffff;
 214
 215         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 216         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 217         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 218         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 219         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 220
 221         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
 222         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
 223         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
 224
 225         return rc;
 226 }
 227
 228 static unsigned h_pic(unsigned long *pool_idle_time,
 229                       unsigned long *num_procs)
 230 {
 231         unsigned long rc;
 232         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 233
 234         rc = plpar_hcall(H_PIC, retbuf);
 235
 236         *pool_idle_time = retbuf[0];
 237         *num_procs = retbuf[1];
 238
 239         return rc;
 240 }
 241
 242 /*
 243  * parse_ppp_data
 244  * Parse out the data returned from h_get_ppp and h_pic
 245  */
 246 static void parse_ppp_data(struct seq_file *m)
 247 {
 248         struct hvcall_ppp_data ppp_data;
 249         struct device_node *root;
 250         const int *perf_level;
 251         int rc;
 252
 253         rc = h_get_ppp(&ppp_data);
 254         if (rc)
 255                 return;
 256
 257         seq_printf(m, "partition_entitled_capacity=%lld\n",
 258                    ppp_data.entitlement);
 259         seq_printf(m, "group=%d\n", ppp_data.group_num);
 260         seq_printf(m, "system_active_processors=%d\n",
 261                    ppp_data.active_system_procs);
 262
 263         /* pool related entries are apropriate for shared configs */
 264         if (lppaca[0].shared_proc) {
 265                 unsigned long pool_idle_time, pool_procs;
 266
 267                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 268
 269                 /* report pool_capacity in percentage */
 270                 seq_printf(m, "pool_capacity=%d\n",
 271                            ppp_data.active_procs_in_pool * 100);
 272
 273                 h_pic(&pool_idle_time, &pool_procs);
 274                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 275                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 276         }
 277
 278         seq_printf(m, "unallocated_capacity_weight=%d\n",
 279                    ppp_data.unallocated_weight);
 280         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 281         seq_printf(m, "capped=%d\n", ppp_data.capped);
 282         seq_printf(m, "unallocated_capacity=%lld\n",
 283                    ppp_data.unallocated_entitlement);
 284
 285         /* The last bits of information returned from h_get_ppp are only
 286          * valid if the ibm,partition-performance-parameters-level
 287          * property is >= 1.
 288          */
 289         root = of_find_node_by_path("/");
 290         if (root) {
 291                 perf_level = of_get_property(root,
 292                                 "ibm,partition-performance-parameters-level",
 293                                              NULL);
 294                 if (perf_level && (*perf_level >= 1)) {
 295                         seq_printf(m,
 296                             "physical_procs_allocated_to_virtualization=%d\n",
 297                                    ppp_data.phys_platform_procs);
 298                         seq_printf(m, "max_proc_capacity_available=%d\n",
 299                                    ppp_data.max_proc_cap_avail);
 300                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 301                                    ppp_data.entitled_proc_cap_avail);
 302                 }
 303
 304                 of_node_put(root);
 305         }
 306 }
 307
 308 /**
 309  * parse_mpp_data
 310  * Parse out data returned from h_get_mpp
 311  */
 312 static void parse_mpp_data(struct seq_file *m)
 313 {
 314         struct hvcall_mpp_data mpp_data;
 315         int rc;
 316
 317         rc = h_get_mpp(&mpp_data);
 318         if (rc)
 319                 return;
 320
 321         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 322
 323         if (mpp_data.mapped_mem != -1)
 324                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 325                            mpp_data.mapped_mem);
 326
 327         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 328         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 329
 330         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 331         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 332                    mpp_data.unallocated_mem_weight);
 333         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 334                    mpp_data.unallocated_entitlement);
 335
 336         if (mpp_data.pool_size != -1)
 337                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 338                            mpp_data.pool_size);
 339
 340         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 341                    mpp_data.loan_request);
 342
 343         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 344 }
 345
 346 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 347 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 348
 349 /*
 350  * parse_system_parameter_string()
 351  * Retrieve the potential_processors, max_entitled_capacity and friends
 352  * through the get-system-parameter rtas call.  Replace keyword strings as
 353  * necessary.
 354  */
 355 static void parse_system_parameter_string(struct seq_file *m)
 356 {
 357         int call_status;
 358
 359         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 360         if (!local_buffer) {
 361                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 362                        __FILE__, __func__, __LINE__);
 363                 return;
 364         }
 365
 366         spin_lock(&rtas_data_buf_lock);
 367         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 368         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 369                                 NULL,
 370                                 SPLPAR_CHARACTERISTICS_TOKEN,
 371                                 __pa(rtas_data_buf),
 372                                 RTAS_DATA_BUF_SIZE);
 373         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 374         spin_unlock(&rtas_data_buf_lock);
 375
 376         if (call_status != 0) {
 377                 printk(KERN_INFO
 378                        "%s %s Error calling get-system-parameter (0x%x)\n",
 379                        __FILE__, __func__, call_status);
 380         } else {
 381                 int splpar_strlen;
 382                 int idx, w_idx;
 383                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 384                 if (!workbuffer) {
 385                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 386                                __FILE__, __func__, __LINE__);
 387                         kfree(local_buffer);
 388                         return;
 389                 }
 390 #ifdef LPARCFG_DEBUG
 391                 printk(KERN_INFO "success calling get-system-parameter \n");
 392 #endif
 393                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 394                 local_buffer += 2;      /* step over strlen value */
 395
 396                 w_idx = 0;
 397                 idx = 0;
 398                 while ((*local_buffer) && (idx < splpar_strlen)) {
 399                         workbuffer[w_idx++] = local_buffer[idx++];
 400                         if ((local_buffer[idx] == ',')
 401                             || (local_buffer[idx] == '\0')) {
 402                                 workbuffer[w_idx] = '\0';
 403                                 if (w_idx) {
 404                                         /* avoid the empty string */
 405                                         seq_printf(m, "%s\n", workbuffer);
 406                                 }
 407                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 408                                 idx++;  /* skip the comma */
 409                                 w_idx = 0;
 410                         } else if (local_buffer[idx] == '=') {
 411                                 /* code here to replace workbuffer contents
 412                                    with different keyword strings */
 413                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 414                                         strcpy(workbuffer,
 415                                                "partition_max_entitled_capacity");
 416                                         w_idx = strlen(workbuffer);
 417                                 }
 418                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 419                                         strcpy(workbuffer,
 420                                                "system_potential_processors");
 421                                         w_idx = strlen(workbuffer);
 422                                 }
 423                         }
 424                 }
 425                 kfree(workbuffer);
 426                 local_buffer -= 2;      /* back up over strlen value */
 427         }
 428         kfree(local_buffer);
 429 }
 430
 431 /* Return the number of processors in the system.
 432  * This function reads through the device tree and counts
 433  * the virtual processors, this does not include threads.
 434  */
 435 static int lparcfg_count_active_processors(void)
 436 {
 437         struct device_node *cpus_dn = NULL;
 438         int count = 0;
 439
 440         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 441 #ifdef LPARCFG_DEBUG
 442                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
 443 #endif
 444                 count++;
 445         }
 446         return count;
 447 }
 448
 449 static void pseries_cmo_data(struct seq_file *m)
 450 {
 451         int cpu;
 452         unsigned long cmo_faults = 0;
 453         unsigned long cmo_fault_time = 0;
 454
 455         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 456
 457         if (!firmware_has_feature(FW_FEATURE_CMO))
 458                 return;
 459
 460         for_each_possible_cpu(cpu) {
 461                 cmo_faults += lppaca[cpu].cmo_faults;
 462                 cmo_fault_time += lppaca[cpu].cmo_fault_time;
 463         }
 464
 465         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 466         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 467                    cmo_fault_time / tb_ticks_per_usec);
 468         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 469         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 470         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 471 }
 472
 473 static void splpar_dispatch_data(struct seq_file *m)
 474 {
 475         int cpu;
 476         unsigned long dispatches = 0;
 477         unsigned long dispatch_dispersions = 0;
 478
 479         for_each_possible_cpu(cpu) {
 480                 dispatches += lppaca[cpu].yield_count;
 481                 dispatch_dispersions += lppaca[cpu].dispersion_count;
 482         }
 483
 484         seq_printf(m, "dispatches=%lu\n", dispatches);
 485         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 486 }
 487
 488 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 489 {
 490         int partition_potential_processors;
 491         int partition_active_processors;
 492         struct device_node *rtas_node;
 493         const int *lrdrp = NULL;
 494
 495         rtas_node = of_find_node_by_path("/rtas");
 496         if (rtas_node)
 497                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 498
 499         if (lrdrp == NULL) {
 500                 partition_potential_processors = vdso_data->processorCount;
 501         } else {
 502                 partition_potential_processors = *(lrdrp + 4);
 503         }
 504         of_node_put(rtas_node);
 505
 506         partition_active_processors = lparcfg_count_active_processors();
 507
 508         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 509                 /* this call handles the ibm,get-system-parameter contents */
 510                 parse_system_parameter_string(m);
 511                 parse_ppp_data(m);
 512                 parse_mpp_data(m);
 513                 pseries_cmo_data(m);
 514                 splpar_dispatch_data(m);
 515
 516                 seq_printf(m, "purr=%ld\n", get_purr());
 517         } else {                /* non SPLPAR case */
 518
 519                 seq_printf(m, "system_active_processors=%d\n",
 520                            partition_potential_processors);
 521
 522                 seq_printf(m, "system_potential_processors=%d\n",
 523                            partition_potential_processors);
 524
 525                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 526                            partition_potential_processors * 100);
 527
 528                 seq_printf(m, "partition_entitled_capacity=%d\n",
 529                            partition_active_processors * 100);
 530         }
 531
 532         seq_printf(m, "partition_active_processors=%d\n",
 533                    partition_active_processors);
 534
 535         seq_printf(m, "partition_potential_processors=%d\n",
 536                    partition_potential_processors);
 537
 538         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 539
 540         return 0;
 541 }
 542
 543 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 544 {
 545         struct hvcall_ppp_data ppp_data;
 546         u8 new_weight;
 547         u64 new_entitled;
 548         ssize_t retval;
 549
 550         /* Get our current parameters */
 551         retval = h_get_ppp(&ppp_data);
 552         if (retval)
 553                 return retval;
 554
 555         if (entitlement) {
 556                 new_weight = ppp_data.weight;
 557                 new_entitled = *entitlement;
 558         } else if (weight) {
 559                 new_weight = *weight;
 560                 new_entitled = ppp_data.entitlement;
 561         } else
 562                 return -EINVAL;
 563
 564         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 565                  __func__, ppp_data.entitlement, ppp_data.weight);
 566
 567         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 568                  __func__, new_entitled, new_weight);
 569
 570         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 571         return retval;
 572 }
 573
 574 /**
 575  * update_mpp
 576  *
 577  * Update the memory entitlement and weight for the partition.  Caller must
 578  * specify either a new entitlement or weight, not both, to be updated
 579  * since the h_set_mpp call takes both entitlement and weight as parameters.
 580  */
 581 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 582 {
 583         struct hvcall_mpp_data mpp_data;
 584         u64 new_entitled;
 585         u8 new_weight;
 586         ssize_t rc;
 587
 588         if (entitlement) {
 589                 /* Check with vio to ensure the new memory entitlement
 590                  * can be handled.
 591                  */
 592                 rc = vio_cmo_entitlement_update(*entitlement);
 593                 if (rc)
 594                         return rc;
 595         }
 596
 597         rc = h_get_mpp(&mpp_data);
 598         if (rc)
 599                 return rc;
 600
 601         if (entitlement) {
 602                 new_weight = mpp_data.mem_weight;
 603                 new_entitled = *entitlement;
 604         } else if (weight) {
 605                 new_weight = *weight;
 606                 new_entitled = mpp_data.entitled_mem;
 607         } else
 608                 return -EINVAL;
 609
 610         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 611                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 612
 613         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 614                  __func__, new_entitled, new_weight);
 615
 616         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 617         return rc;
 618 }
 619
 620 /*
 621  * Interface for changing system parameters (variable capacity weight
 622  * and entitled capacity).  Format of input is "param_name=value";
 623  * anything after value is ignored.  Valid parameters at this time are
 624  * "partition_entitled_capacity" and "capacity_weight".  We use
 625  * H_SET_PPP to alter parameters.
 626  *
 627  * This function should be invoked only on systems with
 628  * FW_FEATURE_SPLPAR.
 629  */
 630 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 631                              size_t count, loff_t * off)
 632 {
 633         int kbuf_sz = 64;
 634         char kbuf[kbuf_sz];
 635         char *tmp;
 636         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 637         u8 new_weight, *new_weight_ptr = &new_weight;
 638         ssize_t retval;
 639
 640         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
 641                         firmware_has_feature(FW_FEATURE_ISERIES))
 642                 return -EINVAL;
 643
 644         if (count > kbuf_sz)
 645                 return -EINVAL;
 646
 647         if (copy_from_user(kbuf, buf, count))
 648                 return -EFAULT;
 649
 650         kbuf[count - 1] = '\0';
 651         tmp = strchr(kbuf, '=');
 652         if (!tmp)
 653                 return -EINVAL;
 654
 655         *tmp++ = '\0';
 656
 657         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 658                 char *endp;
 659                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 660                 if (endp == tmp)
 661                         return -EINVAL;
 662
 663                 retval = update_ppp(new_entitled_ptr, NULL);
 664         } else if (!strcmp(kbuf, "capacity_weight")) {
 665                 char *endp;
 666                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 667                 if (endp == tmp)
 668                         return -EINVAL;
 669
 670                 retval = update_ppp(NULL, new_weight_ptr);
 671         } else if (!strcmp(kbuf, "entitled_memory")) {
 672                 char *endp;
 673                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 674                 if (endp == tmp)
 675                         return -EINVAL;
 676
 677                 retval = update_mpp(new_entitled_ptr, NULL);
 678         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 679                 char *endp;
 680                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 681                 if (endp == tmp)
 682                         return -EINVAL;
 683
 684                 retval = update_mpp(NULL, new_weight_ptr);
 685         } else
 686                 return -EINVAL;
 687
 688         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 689                 retval = count;
 690         } else if (retval == H_BUSY) {
 691                 retval = -EBUSY;
 692         } else if (retval == H_HARDWARE) {
 693                 retval = -EIO;
 694         } else if (retval == H_PARAMETER) {
 695                 retval = -EINVAL;
 696         }
 697
 698         return retval;
 699 }
 700
 701 #else                           /* CONFIG_PPC_PSERIES */
 702
 703 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 704 {
 705         return 0;
 706 }
 707
 708 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 709                              size_t count, loff_t * off)
 710 {
 711         return -EINVAL;
 712 }
 713
 714 #endif                          /* CONFIG_PPC_PSERIES */
 715
 716 static int lparcfg_data(struct seq_file *m, void *v)
 717 {
 718         struct device_node *rootdn;
 719         const char *model = "";
 720         const char *system_id = "";
 721         const char *tmp;
 722         const unsigned int *lp_index_ptr;
 723         unsigned int lp_index = 0;
 724
 725         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 726
 727         rootdn = of_find_node_by_path("/");
 728         if (rootdn) {
 729                 tmp = of_get_property(rootdn, "model", NULL);
 730                 if (tmp) {
 731                         model = tmp;
 732                         /* Skip "IBM," - see platforms/iseries/dt.c */
 733                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 734                                 model += 4;
 735                 }
 736                 tmp = of_get_property(rootdn, "system-id", NULL);
 737                 if (tmp) {
 738                         system_id = tmp;
 739                         /* Skip "IBM," - see platforms/iseries/dt.c */
 740                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 741                                 system_id += 4;
 742                 }
 743                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 744                                         NULL);
 745                 if (lp_index_ptr)
 746                         lp_index = *lp_index_ptr;
 747                 of_node_put(rootdn);
 748         }
 749         seq_printf(m, "serial_number=%s\n", system_id);
 750         seq_printf(m, "system_type=%s\n", model);
 751         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 752
 753         if (firmware_has_feature(FW_FEATURE_ISERIES))
 754                 return iseries_lparcfg_data(m, v);
 755         return pseries_lparcfg_data(m, v);
 756 }
 757
 758 static int lparcfg_open(struct inode *inode, struct file *file)
 759 {
 760         return single_open(file, lparcfg_data, NULL);
 761 }
 762
 763 static const struct file_operations lparcfg_fops = {
 764         .owner          = THIS_MODULE,
 765         .read           = seq_read,
 766         .write          = lparcfg_write,
 767         .open           = lparcfg_open,
 768         .release        = single_release,
 769 };
 770
 771 static int __init lparcfg_init(void)
 772 {
 773         struct proc_dir_entry *ent;
 774         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 775
 776         /* Allow writing if we have FW_FEATURE_SPLPAR */
 777         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
 778                         !firmware_has_feature(FW_FEATURE_ISERIES))
 779                 mode |= S_IWUSR;
 780
 781         ent = proc_create("ppc64/lparcfg", mode, NULL, &lparcfg_fops);
 782         if (!ent) {
 783                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
 784                 return -EIO;
 785         }
 786
 787         proc_ppc64_lparcfg = ent;
 788         return 0;
 789 }
 790
 791 static void __exit lparcfg_cleanup(void)
 792 {
 793         if (proc_ppc64_lparcfg)
 794                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 795 }
 796
 797 module_init(lparcfg_init);
 798 module_exit(lparcfg_cleanup);
 799 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 800 MODULE_AUTHOR("Dave Engebretsen");
 801 MODULE_LICENSE("GPL");