arch/powerpc/platforms/pseries/lparcfg.c

   1 /*
   2  * PowerPC64 LPAR Configuration Information Driver
   3  *
   4  * Dave Engebretsen engebret@us.ibm.com
   5  *    Copyright (c) 2003 Dave Engebretsen
   6  * Will Schmidt willschm@us.ibm.com
   7  *    SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
   8  *    seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
   9  * Nathan Lynch nathanl@austin.ibm.com
  10  *    Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  * This driver creates a proc file at /proc/ppc64/lparcfg which contains
  18  * keyword - value pairs that specify the configuration of the partition.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/errno.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/init.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/slab.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/lppaca.h>
  30 #include <asm/hvcall.h>
  31 #include <asm/firmware.h>
  32 #include <asm/rtas.h>
  33 #include <asm/time.h>
  34 #include <asm/prom.h>
  35 #include <asm/vdso_datapage.h>
  36 #include <asm/vio.h>
  37 #include <asm/mmu.h>
  38 #include <asm/machdep.h>
  39
  40
  41 /*
  42  * This isn't a module but we expose that to userspace
  43  * via /proc so leave the definitions here
  44  */
  45 #define MODULE_VERS "1.9"
  46 #define MODULE_NAME "lparcfg"
  47
  48 /* #define LPARCFG_DEBUG */
  49
  50 /*
  51  * Track sum of all purrs across all processors. This is used to further
  52  * calculate usage values by different applications
  53  */
  54 static unsigned long get_purr(void)
  55 {
  56         unsigned long sum_purr = 0;
  57         int cpu;
  58
  59         for_each_possible_cpu(cpu) {
  60                 struct cpu_usage *cu;
  61
  62                 cu = &per_cpu(cpu_usage_array, cpu);
  63                 sum_purr += cu->current_tb;
  64         }
  65         return sum_purr;
  66 }
  67
  68 /*
  69  * Methods used to fetch LPAR data when running on a pSeries platform.
  70  */
  71
  72 struct hvcall_ppp_data {
  73         u64     entitlement;
  74         u64     unallocated_entitlement;
  75         u16     group_num;
  76         u16     pool_num;
  77         u8      capped;
  78         u8      weight;
  79         u8      unallocated_weight;
  80         u16     active_procs_in_pool;
  81         u16     active_system_procs;
  82         u16     phys_platform_procs;
  83         u32     max_proc_cap_avail;
  84         u32     entitled_proc_cap_avail;
  85 };
  86
  87 /*
  88  * H_GET_PPP hcall returns info in 4 parms.
  89  *  entitled_capacity,unallocated_capacity,
  90  *  aggregation, resource_capability).
  91  *
  92  *  R4 = Entitled Processor Capacity Percentage.
  93  *  R5 = Unallocated Processor Capacity Percentage.
  94  *  R6 (AABBCCDDEEFFGGHH).
  95  *      XXXX - reserved (0)
  96  *          XXXX - reserved (0)
  97  *              XXXX - Group Number
  98  *                  XXXX - Pool Number.
  99  *  R7 (IIJJKKLLMMNNOOPP).
 100  *      XX - reserved. (0)
 101  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 102  *          XX - variable processor Capacity Weight
 103  *            XX - Unallocated Variable Processor Capacity Weight.
 104  *              XXXX - Active processors in Physical Processor Pool.
 105  *                  XXXX  - Processors active on platform.
 106  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
 107  *      XXXX - Physical platform procs allocated to virtualization.
 108  *          XXXXXX - Max procs capacity % available to the partitions pool.
 109  *                XXXXXX - Entitled procs capacity % available to the
 110  *                         partitions pool.
 111  */
 112 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 113 {
 114         unsigned long rc;
 115         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 116
 117         rc = plpar_hcall9(H_GET_PPP, retbuf);
 118
 119         ppp_data->entitlement = retbuf[0];
 120         ppp_data->unallocated_entitlement = retbuf[1];
 121
 122         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 123         ppp_data->pool_num = retbuf[2] & 0xffff;
 124
 125         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 126         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 127         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 128         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 129         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 130
 131         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
 132         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
 133         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
 134
 135         return rc;
 136 }
 137
 138 static unsigned h_pic(unsigned long *pool_idle_time,
 139                       unsigned long *num_procs)
 140 {
 141         unsigned long rc;
 142         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 143
 144         rc = plpar_hcall(H_PIC, retbuf);
 145
 146         *pool_idle_time = retbuf[0];
 147         *num_procs = retbuf[1];
 148
 149         return rc;
 150 }
 151
 152 /*
 153  * parse_ppp_data
 154  * Parse out the data returned from h_get_ppp and h_pic
 155  */
 156 static void parse_ppp_data(struct seq_file *m)
 157 {
 158         struct hvcall_ppp_data ppp_data;
 159         struct device_node *root;
 160         const __be32 *perf_level;
 161         int rc;
 162
 163         rc = h_get_ppp(&ppp_data);
 164         if (rc)
 165                 return;
 166
 167         seq_printf(m, "partition_entitled_capacity=%lld\n",
 168                    ppp_data.entitlement);
 169         seq_printf(m, "group=%d\n", ppp_data.group_num);
 170         seq_printf(m, "system_active_processors=%d\n",
 171                    ppp_data.active_system_procs);
 172
 173         /* pool related entries are appropriate for shared configs */
 174         if (lppaca_shared_proc(get_lppaca())) {
 175                 unsigned long pool_idle_time, pool_procs;
 176
 177                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 178
 179                 /* report pool_capacity in percentage */
 180                 seq_printf(m, "pool_capacity=%d\n",
 181                            ppp_data.active_procs_in_pool * 100);
 182
 183                 h_pic(&pool_idle_time, &pool_procs);
 184                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 185                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 186         }
 187
 188         seq_printf(m, "unallocated_capacity_weight=%d\n",
 189                    ppp_data.unallocated_weight);
 190         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 191         seq_printf(m, "capped=%d\n", ppp_data.capped);
 192         seq_printf(m, "unallocated_capacity=%lld\n",
 193                    ppp_data.unallocated_entitlement);
 194
 195         /* The last bits of information returned from h_get_ppp are only
 196          * valid if the ibm,partition-performance-parameters-level
 197          * property is >= 1.
 198          */
 199         root = of_find_node_by_path("/");
 200         if (root) {
 201                 perf_level = of_get_property(root,
 202                                 "ibm,partition-performance-parameters-level",
 203                                              NULL);
 204                 if (perf_level && (be32_to_cpup(perf_level) >= 1)) {
 205                         seq_printf(m,
 206                             "physical_procs_allocated_to_virtualization=%d\n",
 207                                    ppp_data.phys_platform_procs);
 208                         seq_printf(m, "max_proc_capacity_available=%d\n",
 209                                    ppp_data.max_proc_cap_avail);
 210                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 211                                    ppp_data.entitled_proc_cap_avail);
 212                 }
 213
 214                 of_node_put(root);
 215         }
 216 }
 217
 218 /**
 219  * parse_mpp_data
 220  * Parse out data returned from h_get_mpp
 221  */
 222 static void parse_mpp_data(struct seq_file *m)
 223 {
 224         struct hvcall_mpp_data mpp_data;
 225         int rc;
 226
 227         rc = h_get_mpp(&mpp_data);
 228         if (rc)
 229                 return;
 230
 231         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 232
 233         if (mpp_data.mapped_mem != -1)
 234                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 235                            mpp_data.mapped_mem);
 236
 237         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 238         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 239
 240         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 241         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 242                    mpp_data.unallocated_mem_weight);
 243         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 244                    mpp_data.unallocated_entitlement);
 245
 246         if (mpp_data.pool_size != -1)
 247                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 248                            mpp_data.pool_size);
 249
 250         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 251                    mpp_data.loan_request);
 252
 253         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 254 }
 255
 256 /**
 257  * parse_mpp_x_data
 258  * Parse out data returned from h_get_mpp_x
 259  */
 260 static void parse_mpp_x_data(struct seq_file *m)
 261 {
 262         struct hvcall_mpp_x_data mpp_x_data;
 263
 264         if (!firmware_has_feature(FW_FEATURE_XCMO))
 265                 return;
 266         if (h_get_mpp_x(&mpp_x_data))
 267                 return;
 268
 269         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
 270
 271         if (mpp_x_data.pool_coalesced_bytes)
 272                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
 273                            mpp_x_data.pool_coalesced_bytes);
 274         if (mpp_x_data.pool_purr_cycles)
 275                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
 276         if (mpp_x_data.pool_spurr_cycles)
 277                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
 278 }
 279
 280 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 281 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 282
 283 /*
 284  * parse_system_parameter_string()
 285  * Retrieve the potential_processors, max_entitled_capacity and friends
 286  * through the get-system-parameter rtas call.  Replace keyword strings as
 287  * necessary.
 288  */
 289 static void parse_system_parameter_string(struct seq_file *m)
 290 {
 291         int call_status;
 292
 293         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 294         if (!local_buffer) {
 295                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 296                        __FILE__, __func__, __LINE__);
 297                 return;
 298         }
 299
 300         spin_lock(&rtas_data_buf_lock);
 301         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 302         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 303                                 NULL,
 304                                 SPLPAR_CHARACTERISTICS_TOKEN,
 305                                 __pa(rtas_data_buf),
 306                                 RTAS_DATA_BUF_SIZE);
 307         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 308         local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
 309         spin_unlock(&rtas_data_buf_lock);
 310
 311         if (call_status != 0) {
 312                 printk(KERN_INFO
 313                        "%s %s Error calling get-system-parameter (0x%x)\n",
 314                        __FILE__, __func__, call_status);
 315         } else {
 316                 int splpar_strlen;
 317                 int idx, w_idx;
 318                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 319                 if (!workbuffer) {
 320                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 321                                __FILE__, __func__, __LINE__);
 322                         kfree(local_buffer);
 323                         return;
 324                 }
 325 #ifdef LPARCFG_DEBUG
 326                 printk(KERN_INFO "success calling get-system-parameter\n");
 327 #endif
 328                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 329                 local_buffer += 2;      /* step over strlen value */
 330
 331                 w_idx = 0;
 332                 idx = 0;
 333                 while ((*local_buffer) && (idx < splpar_strlen)) {
 334                         workbuffer[w_idx++] = local_buffer[idx++];
 335                         if ((local_buffer[idx] == ',')
 336                             || (local_buffer[idx] == '\0')) {
 337                                 workbuffer[w_idx] = '\0';
 338                                 if (w_idx) {
 339                                         /* avoid the empty string */
 340                                         seq_printf(m, "%s\n", workbuffer);
 341                                 }
 342                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 343                                 idx++;  /* skip the comma */
 344                                 w_idx = 0;
 345                         } else if (local_buffer[idx] == '=') {
 346                                 /* code here to replace workbuffer contents
 347                                    with different keyword strings */
 348                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 349                                         strcpy(workbuffer,
 350                                                "partition_max_entitled_capacity");
 351                                         w_idx = strlen(workbuffer);
 352                                 }
 353                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 354                                         strcpy(workbuffer,
 355                                                "system_potential_processors");
 356                                         w_idx = strlen(workbuffer);
 357                                 }
 358                         }
 359                 }
 360                 kfree(workbuffer);
 361                 local_buffer -= 2;      /* back up over strlen value */
 362         }
 363         kfree(local_buffer);
 364 }
 365
 366 /* Return the number of processors in the system.
 367  * This function reads through the device tree and counts
 368  * the virtual processors, this does not include threads.
 369  */
 370 static int lparcfg_count_active_processors(void)
 371 {
 372         struct device_node *cpus_dn = NULL;
 373         int count = 0;
 374
 375         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 376 #ifdef LPARCFG_DEBUG
 377                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
 378 #endif
 379                 count++;
 380         }
 381         return count;
 382 }
 383
 384 static void pseries_cmo_data(struct seq_file *m)
 385 {
 386         int cpu;
 387         unsigned long cmo_faults = 0;
 388         unsigned long cmo_fault_time = 0;
 389
 390         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 391
 392         if (!firmware_has_feature(FW_FEATURE_CMO))
 393                 return;
 394
 395         for_each_possible_cpu(cpu) {
 396                 cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
 397                 cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
 398         }
 399
 400         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 401         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 402                    cmo_fault_time / tb_ticks_per_usec);
 403         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 404         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 405         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 406 }
 407
 408 static void splpar_dispatch_data(struct seq_file *m)
 409 {
 410         int cpu;
 411         unsigned long dispatches = 0;
 412         unsigned long dispatch_dispersions = 0;
 413
 414         for_each_possible_cpu(cpu) {
 415                 dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
 416                 dispatch_dispersions +=
 417                         be32_to_cpu(lppaca_of(cpu).dispersion_count);
 418         }
 419
 420         seq_printf(m, "dispatches=%lu\n", dispatches);
 421         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 422 }
 423
 424 static void parse_em_data(struct seq_file *m)
 425 {
 426         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 427
 428         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 429             plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
 430                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
 431 }
 432
 433 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 434 {
 435         int partition_potential_processors;
 436         int partition_active_processors;
 437         struct device_node *rtas_node;
 438         const __be32 *lrdrp = NULL;
 439
 440         rtas_node = of_find_node_by_path("/rtas");
 441         if (rtas_node)
 442                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 443
 444         if (lrdrp == NULL) {
 445                 partition_potential_processors = vdso_data->processorCount;
 446         } else {
 447                 partition_potential_processors = be32_to_cpup(lrdrp + 4);
 448         }
 449         of_node_put(rtas_node);
 450
 451         partition_active_processors = lparcfg_count_active_processors();
 452
 453         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 454                 /* this call handles the ibm,get-system-parameter contents */
 455                 parse_system_parameter_string(m);
 456                 parse_ppp_data(m);
 457                 parse_mpp_data(m);
 458                 parse_mpp_x_data(m);
 459                 pseries_cmo_data(m);
 460                 splpar_dispatch_data(m);
 461
 462                 seq_printf(m, "purr=%ld\n", get_purr());
 463         } else {                /* non SPLPAR case */
 464
 465                 seq_printf(m, "system_active_processors=%d\n",
 466                            partition_potential_processors);
 467
 468                 seq_printf(m, "system_potential_processors=%d\n",
 469                            partition_potential_processors);
 470
 471                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 472                            partition_potential_processors * 100);
 473
 474                 seq_printf(m, "partition_entitled_capacity=%d\n",
 475                            partition_active_processors * 100);
 476         }
 477
 478         seq_printf(m, "partition_active_processors=%d\n",
 479                    partition_active_processors);
 480
 481         seq_printf(m, "partition_potential_processors=%d\n",
 482                    partition_potential_processors);
 483
 484         seq_printf(m, "shared_processor_mode=%d\n",
 485                    lppaca_shared_proc(get_lppaca()));
 486
 487 #ifdef CONFIG_PPC_STD_MMU_64
 488         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 489 #endif
 490         parse_em_data(m);
 491
 492         return 0;
 493 }
 494
 495 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 496 {
 497         struct hvcall_ppp_data ppp_data;
 498         u8 new_weight;
 499         u64 new_entitled;
 500         ssize_t retval;
 501
 502         /* Get our current parameters */
 503         retval = h_get_ppp(&ppp_data);
 504         if (retval)
 505                 return retval;
 506
 507         if (entitlement) {
 508                 new_weight = ppp_data.weight;
 509                 new_entitled = *entitlement;
 510         } else if (weight) {
 511                 new_weight = *weight;
 512                 new_entitled = ppp_data.entitlement;
 513         } else
 514                 return -EINVAL;
 515
 516         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 517                  __func__, ppp_data.entitlement, ppp_data.weight);
 518
 519         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 520                  __func__, new_entitled, new_weight);
 521
 522         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 523         return retval;
 524 }
 525
 526 /**
 527  * update_mpp
 528  *
 529  * Update the memory entitlement and weight for the partition.  Caller must
 530  * specify either a new entitlement or weight, not both, to be updated
 531  * since the h_set_mpp call takes both entitlement and weight as parameters.
 532  */
 533 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 534 {
 535         struct hvcall_mpp_data mpp_data;
 536         u64 new_entitled;
 537         u8 new_weight;
 538         ssize_t rc;
 539
 540         if (entitlement) {
 541                 /* Check with vio to ensure the new memory entitlement
 542                  * can be handled.
 543                  */
 544                 rc = vio_cmo_entitlement_update(*entitlement);
 545                 if (rc)
 546                         return rc;
 547         }
 548
 549         rc = h_get_mpp(&mpp_data);
 550         if (rc)
 551                 return rc;
 552
 553         if (entitlement) {
 554                 new_weight = mpp_data.mem_weight;
 555                 new_entitled = *entitlement;
 556         } else if (weight) {
 557                 new_weight = *weight;
 558                 new_entitled = mpp_data.entitled_mem;
 559         } else
 560                 return -EINVAL;
 561
 562         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 563                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 564
 565         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 566                  __func__, new_entitled, new_weight);
 567
 568         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 569         return rc;
 570 }
 571
 572 /*
 573  * Interface for changing system parameters (variable capacity weight
 574  * and entitled capacity).  Format of input is "param_name=value";
 575  * anything after value is ignored.  Valid parameters at this time are
 576  * "partition_entitled_capacity" and "capacity_weight".  We use
 577  * H_SET_PPP to alter parameters.
 578  *
 579  * This function should be invoked only on systems with
 580  * FW_FEATURE_SPLPAR.
 581  */
 582 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 583                              size_t count, loff_t * off)
 584 {
 585         int kbuf_sz = 64;
 586         char kbuf[kbuf_sz];
 587         char *tmp;
 588         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 589         u8 new_weight, *new_weight_ptr = &new_weight;
 590         ssize_t retval;
 591
 592         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 593                 return -EINVAL;
 594
 595         if (count > kbuf_sz)
 596                 return -EINVAL;
 597
 598         if (copy_from_user(kbuf, buf, count))
 599                 return -EFAULT;
 600
 601         kbuf[count - 1] = '\0';
 602         tmp = strchr(kbuf, '=');
 603         if (!tmp)
 604                 return -EINVAL;
 605
 606         *tmp++ = '\0';
 607
 608         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 609                 char *endp;
 610                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 611                 if (endp == tmp)
 612                         return -EINVAL;
 613
 614                 retval = update_ppp(new_entitled_ptr, NULL);
 615         } else if (!strcmp(kbuf, "capacity_weight")) {
 616                 char *endp;
 617                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 618                 if (endp == tmp)
 619                         return -EINVAL;
 620
 621                 retval = update_ppp(NULL, new_weight_ptr);
 622         } else if (!strcmp(kbuf, "entitled_memory")) {
 623                 char *endp;
 624                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 625                 if (endp == tmp)
 626                         return -EINVAL;
 627
 628                 retval = update_mpp(new_entitled_ptr, NULL);
 629         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 630                 char *endp;
 631                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 632                 if (endp == tmp)
 633                         return -EINVAL;
 634
 635                 retval = update_mpp(NULL, new_weight_ptr);
 636         } else
 637                 return -EINVAL;
 638
 639         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 640                 retval = count;
 641         } else if (retval == H_BUSY) {
 642                 retval = -EBUSY;
 643         } else if (retval == H_HARDWARE) {
 644                 retval = -EIO;
 645         } else if (retval == H_PARAMETER) {
 646                 retval = -EINVAL;
 647         }
 648
 649         return retval;
 650 }
 651
 652 static int lparcfg_data(struct seq_file *m, void *v)
 653 {
 654         struct device_node *rootdn;
 655         const char *model = "";
 656         const char *system_id = "";
 657         const char *tmp;
 658         const __be32 *lp_index_ptr;
 659         unsigned int lp_index = 0;
 660
 661         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
 662
 663         rootdn = of_find_node_by_path("/");
 664         if (rootdn) {
 665                 tmp = of_get_property(rootdn, "model", NULL);
 666                 if (tmp)
 667                         model = tmp;
 668                 tmp = of_get_property(rootdn, "system-id", NULL);
 669                 if (tmp)
 670                         system_id = tmp;
 671                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 672                                         NULL);
 673                 if (lp_index_ptr)
 674                         lp_index = be32_to_cpup(lp_index_ptr);
 675                 of_node_put(rootdn);
 676         }
 677         seq_printf(m, "serial_number=%s\n", system_id);
 678         seq_printf(m, "system_type=%s\n", model);
 679         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 680
 681         return pseries_lparcfg_data(m, v);
 682 }
 683
 684 static int lparcfg_open(struct inode *inode, struct file *file)
 685 {
 686         return single_open(file, lparcfg_data, NULL);
 687 }
 688
 689 static const struct file_operations lparcfg_fops = {
 690         .read           = seq_read,
 691         .write          = lparcfg_write,
 692         .open           = lparcfg_open,
 693         .release        = single_release,
 694         .llseek         = seq_lseek,
 695 };
 696
 697 static int __init lparcfg_init(void)
 698 {
 699         umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 700
 701         /* Allow writing if we have FW_FEATURE_SPLPAR */
 702         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 703                 mode |= S_IWUSR;
 704
 705         if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops)) {
 706                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
 707                 return -EIO;
 708         }
 709         return 0;
 710 }
 711 machine_device_initcall(pseries, lparcfg_init);