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