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 <linux/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 #include "pseries.h"
  41
  42 /*
  43  * This isn't a module but we expose that to userspace
  44  * via /proc so leave the definitions here
  45  */
  46 #define MODULE_VERS "1.9"
  47 #define MODULE_NAME "lparcfg"
  48
  49 /* #define LPARCFG_DEBUG */
  50
  51 /*
  52  * Track sum of all purrs across all processors. This is used to further
  53  * calculate usage values by different applications
  54  */
  55 static void cpu_get_purr(void *arg)
  56 {
  57         atomic64_t *sum = arg;
  58
  59         atomic64_add(mfspr(SPRN_PURR), sum);
  60 }
  61
  62 static unsigned long get_purr(void)
  63 {
  64         atomic64_t purr = ATOMIC64_INIT(0);
  65
  66         on_each_cpu(cpu_get_purr, &purr, 1);
  67
  68         return atomic64_read(&purr);
  69 }
  70
  71 /*
  72  * Methods used to fetch LPAR data when running on a pSeries platform.
  73  */
  74
  75 struct hvcall_ppp_data {
  76         u64     entitlement;
  77         u64     unallocated_entitlement;
  78         u16     group_num;
  79         u16     pool_num;
  80         u8      capped;
  81         u8      weight;
  82         u8      unallocated_weight;
  83         u16     active_procs_in_pool;
  84         u16     active_system_procs;
  85         u16     phys_platform_procs;
  86         u32     max_proc_cap_avail;
  87         u32     entitled_proc_cap_avail;
  88 };
  89
  90 /*
  91  * H_GET_PPP hcall returns info in 4 parms.
  92  *  entitled_capacity,unallocated_capacity,
  93  *  aggregation, resource_capability).
  94  *
  95  *  R4 = Entitled Processor Capacity Percentage.
  96  *  R5 = Unallocated Processor Capacity Percentage.
  97  *  R6 (AABBCCDDEEFFGGHH).
  98  *      XXXX - reserved (0)
  99  *          XXXX - reserved (0)
 100  *              XXXX - Group Number
 101  *                  XXXX - Pool Number.
 102  *  R7 (IIJJKKLLMMNNOOPP).
 103  *      XX - reserved. (0)
 104  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 105  *          XX - variable processor Capacity Weight
 106  *            XX - Unallocated Variable Processor Capacity Weight.
 107  *              XXXX - Active processors in Physical Processor Pool.
 108  *                  XXXX  - Processors active on platform.
 109  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
 110  *      XXXX - Physical platform procs allocated to virtualization.
 111  *          XXXXXX - Max procs capacity % available to the partitions pool.
 112  *                XXXXXX - Entitled procs capacity % available to the
 113  *                         partitions pool.
 114  */
 115 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 116 {
 117         unsigned long rc;
 118         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 119
 120         rc = plpar_hcall9(H_GET_PPP, retbuf);
 121
 122         ppp_data->entitlement = retbuf[0];
 123         ppp_data->unallocated_entitlement = retbuf[1];
 124
 125         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 126         ppp_data->pool_num = retbuf[2] & 0xffff;
 127
 128         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 129         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 130         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 131         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 132         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 133
 134         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
 135         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
 136         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
 137
 138         return rc;
 139 }
 140
 141 static unsigned h_pic(unsigned long *pool_idle_time,
 142                       unsigned long *num_procs)
 143 {
 144         unsigned long rc;
 145         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 146
 147         rc = plpar_hcall(H_PIC, retbuf);
 148
 149         *pool_idle_time = retbuf[0];
 150         *num_procs = retbuf[1];
 151
 152         return rc;
 153 }
 154
 155 /*
 156  * parse_ppp_data
 157  * Parse out the data returned from h_get_ppp and h_pic
 158  */
 159 static void parse_ppp_data(struct seq_file *m)
 160 {
 161         struct hvcall_ppp_data ppp_data;
 162         struct device_node *root;
 163         const __be32 *perf_level;
 164         int rc;
 165
 166         rc = h_get_ppp(&ppp_data);
 167         if (rc)
 168                 return;
 169
 170         seq_printf(m, "partition_entitled_capacity=%lld\n",
 171                    ppp_data.entitlement);
 172         seq_printf(m, "group=%d\n", ppp_data.group_num);
 173         seq_printf(m, "system_active_processors=%d\n",
 174                    ppp_data.active_system_procs);
 175
 176         /* pool related entries are appropriate for shared configs */
 177         if (lppaca_shared_proc(get_lppaca())) {
 178                 unsigned long pool_idle_time, pool_procs;
 179
 180                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 181
 182                 /* report pool_capacity in percentage */
 183                 seq_printf(m, "pool_capacity=%d\n",
 184                            ppp_data.active_procs_in_pool * 100);
 185
 186                 h_pic(&pool_idle_time, &pool_procs);
 187                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 188                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 189         }
 190
 191         seq_printf(m, "unallocated_capacity_weight=%d\n",
 192                    ppp_data.unallocated_weight);
 193         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 194         seq_printf(m, "capped=%d\n", ppp_data.capped);
 195         seq_printf(m, "unallocated_capacity=%lld\n",
 196                    ppp_data.unallocated_entitlement);
 197
 198         /* The last bits of information returned from h_get_ppp are only
 199          * valid if the ibm,partition-performance-parameters-level
 200          * property is >= 1.
 201          */
 202         root = of_find_node_by_path("/");
 203         if (root) {
 204                 perf_level = of_get_property(root,
 205                                 "ibm,partition-performance-parameters-level",
 206                                              NULL);
 207                 if (perf_level && (be32_to_cpup(perf_level) >= 1)) {
 208                         seq_printf(m,
 209                             "physical_procs_allocated_to_virtualization=%d\n",
 210                                    ppp_data.phys_platform_procs);
 211                         seq_printf(m, "max_proc_capacity_available=%d\n",
 212                                    ppp_data.max_proc_cap_avail);
 213                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 214                                    ppp_data.entitled_proc_cap_avail);
 215                 }
 216
 217                 of_node_put(root);
 218         }
 219 }
 220
 221 /**
 222  * parse_mpp_data
 223  * Parse out data returned from h_get_mpp
 224  */
 225 static void parse_mpp_data(struct seq_file *m)
 226 {
 227         struct hvcall_mpp_data mpp_data;
 228         int rc;
 229
 230         rc = h_get_mpp(&mpp_data);
 231         if (rc)
 232                 return;
 233
 234         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 235
 236         if (mpp_data.mapped_mem != -1)
 237                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 238                            mpp_data.mapped_mem);
 239
 240         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 241         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 242
 243         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 244         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 245                    mpp_data.unallocated_mem_weight);
 246         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 247                    mpp_data.unallocated_entitlement);
 248
 249         if (mpp_data.pool_size != -1)
 250                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 251                            mpp_data.pool_size);
 252
 253         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 254                    mpp_data.loan_request);
 255
 256         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 257 }
 258
 259 /**
 260  * parse_mpp_x_data
 261  * Parse out data returned from h_get_mpp_x
 262  */
 263 static void parse_mpp_x_data(struct seq_file *m)
 264 {
 265         struct hvcall_mpp_x_data mpp_x_data;
 266
 267         if (!firmware_has_feature(FW_FEATURE_XCMO))
 268                 return;
 269         if (h_get_mpp_x(&mpp_x_data))
 270                 return;
 271
 272         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
 273
 274         if (mpp_x_data.pool_coalesced_bytes)
 275                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
 276                            mpp_x_data.pool_coalesced_bytes);
 277         if (mpp_x_data.pool_purr_cycles)
 278                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
 279         if (mpp_x_data.pool_spurr_cycles)
 280                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
 281 }
 282
 283 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 284 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 285
 286 /*
 287  * parse_system_parameter_string()
 288  * Retrieve the potential_processors, max_entitled_capacity and friends
 289  * through the get-system-parameter rtas call.  Replace keyword strings as
 290  * necessary.
 291  */
 292 static void parse_system_parameter_string(struct seq_file *m)
 293 {
 294         int call_status;
 295
 296         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 297         if (!local_buffer) {
 298                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 299                        __FILE__, __func__, __LINE__);
 300                 return;
 301         }
 302
 303         spin_lock(&rtas_data_buf_lock);
 304         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 305         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 306                                 NULL,
 307                                 SPLPAR_CHARACTERISTICS_TOKEN,
 308                                 __pa(rtas_data_buf),
 309                                 RTAS_DATA_BUF_SIZE);
 310         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 311         local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
 312         spin_unlock(&rtas_data_buf_lock);
 313
 314         if (call_status != 0) {
 315                 printk(KERN_INFO
 316                        "%s %s Error calling get-system-parameter (0x%x)\n",
 317                        __FILE__, __func__, call_status);
 318         } else {
 319                 int splpar_strlen;
 320                 int idx, w_idx;
 321                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 322                 if (!workbuffer) {
 323                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 324                                __FILE__, __func__, __LINE__);
 325                         kfree(local_buffer);
 326                         return;
 327                 }
 328 #ifdef LPARCFG_DEBUG
 329                 printk(KERN_INFO "success calling get-system-parameter\n");
 330 #endif
 331                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 332                 local_buffer += 2;      /* step over strlen value */
 333
 334                 w_idx = 0;
 335                 idx = 0;
 336                 while ((*local_buffer) && (idx < splpar_strlen)) {
 337                         workbuffer[w_idx++] = local_buffer[idx++];
 338                         if ((local_buffer[idx] == ',')
 339                             || (local_buffer[idx] == '\0')) {
 340                                 workbuffer[w_idx] = '\0';
 341                                 if (w_idx) {
 342                                         /* avoid the empty string */
 343                                         seq_printf(m, "%s\n", workbuffer);
 344                                 }
 345                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 346                                 idx++;  /* skip the comma */
 347                                 w_idx = 0;
 348                         } else if (local_buffer[idx] == '=') {
 349                                 /* code here to replace workbuffer contents
 350                                    with different keyword strings */
 351                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 352                                         strcpy(workbuffer,
 353                                                "partition_max_entitled_capacity");
 354                                         w_idx = strlen(workbuffer);
 355                                 }
 356                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 357                                         strcpy(workbuffer,
 358                                                "system_potential_processors");
 359                                         w_idx = strlen(workbuffer);
 360                                 }
 361                         }
 362                 }
 363                 kfree(workbuffer);
 364                 local_buffer -= 2;      /* back up over strlen value */
 365         }
 366         kfree(local_buffer);
 367 }
 368
 369 /* Return the number of processors in the system.
 370  * This function reads through the device tree and counts
 371  * the virtual processors, this does not include threads.
 372  */
 373 static int lparcfg_count_active_processors(void)
 374 {
 375         struct device_node *cpus_dn;
 376         int count = 0;
 377
 378         for_each_node_by_type(cpus_dn, "cpu") {
 379 #ifdef LPARCFG_DEBUG
 380                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
 381 #endif
 382                 count++;
 383         }
 384         return count;
 385 }
 386
 387 static void pseries_cmo_data(struct seq_file *m)
 388 {
 389         int cpu;
 390         unsigned long cmo_faults = 0;
 391         unsigned long cmo_fault_time = 0;
 392
 393         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 394
 395         if (!firmware_has_feature(FW_FEATURE_CMO))
 396                 return;
 397
 398         for_each_possible_cpu(cpu) {
 399                 cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
 400                 cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
 401         }
 402
 403         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 404         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 405                    cmo_fault_time / tb_ticks_per_usec);
 406         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 407         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 408         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 409 }
 410
 411 static void splpar_dispatch_data(struct seq_file *m)
 412 {
 413         int cpu;
 414         unsigned long dispatches = 0;
 415         unsigned long dispatch_dispersions = 0;
 416
 417         for_each_possible_cpu(cpu) {
 418                 dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
 419                 dispatch_dispersions +=
 420                         be32_to_cpu(lppaca_of(cpu).dispersion_count);
 421         }
 422
 423         seq_printf(m, "dispatches=%lu\n", dispatches);
 424         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 425 }
 426
 427 static void parse_em_data(struct seq_file *m)
 428 {
 429         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 430
 431         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 432             plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
 433                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
 434 }
 435
 436 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 437 {
 438         int partition_potential_processors;
 439         int partition_active_processors;
 440         struct device_node *rtas_node;
 441         const __be32 *lrdrp = NULL;
 442
 443         rtas_node = of_find_node_by_path("/rtas");
 444         if (rtas_node)
 445                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 446
 447         if (lrdrp == NULL) {
 448                 partition_potential_processors = vdso_data->processorCount;
 449         } else {
 450                 partition_potential_processors = be32_to_cpup(lrdrp + 4);
 451         }
 452         of_node_put(rtas_node);
 453
 454         partition_active_processors = lparcfg_count_active_processors();
 455
 456         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 457                 /* this call handles the ibm,get-system-parameter contents */
 458                 parse_system_parameter_string(m);
 459                 parse_ppp_data(m);
 460                 parse_mpp_data(m);
 461                 parse_mpp_x_data(m);
 462                 pseries_cmo_data(m);
 463                 splpar_dispatch_data(m);
 464
 465                 seq_printf(m, "purr=%ld\n", get_purr());
 466         } else {                /* non SPLPAR case */
 467
 468                 seq_printf(m, "system_active_processors=%d\n",
 469                            partition_potential_processors);
 470
 471                 seq_printf(m, "system_potential_processors=%d\n",
 472                            partition_potential_processors);
 473
 474                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 475                            partition_potential_processors * 100);
 476
 477                 seq_printf(m, "partition_entitled_capacity=%d\n",
 478                            partition_active_processors * 100);
 479         }
 480
 481         seq_printf(m, "partition_active_processors=%d\n",
 482                    partition_active_processors);
 483
 484         seq_printf(m, "partition_potential_processors=%d\n",
 485                    partition_potential_processors);
 486
 487         seq_printf(m, "shared_processor_mode=%d\n",
 488                    lppaca_shared_proc(get_lppaca()));
 489
 490 #ifdef CONFIG_PPC_BOOK3S_64
 491         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 492 #endif
 493         parse_em_data(m);
 494
 495         return 0;
 496 }
 497
 498 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 499 {
 500         struct hvcall_ppp_data ppp_data;
 501         u8 new_weight;
 502         u64 new_entitled;
 503         ssize_t retval;
 504
 505         /* Get our current parameters */
 506         retval = h_get_ppp(&ppp_data);
 507         if (retval)
 508                 return retval;
 509
 510         if (entitlement) {
 511                 new_weight = ppp_data.weight;
 512                 new_entitled = *entitlement;
 513         } else if (weight) {
 514                 new_weight = *weight;
 515                 new_entitled = ppp_data.entitlement;
 516         } else
 517                 return -EINVAL;
 518
 519         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 520                  __func__, ppp_data.entitlement, ppp_data.weight);
 521
 522         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 523                  __func__, new_entitled, new_weight);
 524
 525         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 526         return retval;
 527 }
 528
 529 /**
 530  * update_mpp
 531  *
 532  * Update the memory entitlement and weight for the partition.  Caller must
 533  * specify either a new entitlement or weight, not both, to be updated
 534  * since the h_set_mpp call takes both entitlement and weight as parameters.
 535  */
 536 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 537 {
 538         struct hvcall_mpp_data mpp_data;
 539         u64 new_entitled;
 540         u8 new_weight;
 541         ssize_t rc;
 542
 543         if (entitlement) {
 544                 /* Check with vio to ensure the new memory entitlement
 545                  * can be handled.
 546                  */
 547                 rc = vio_cmo_entitlement_update(*entitlement);
 548                 if (rc)
 549                         return rc;
 550         }
 551
 552         rc = h_get_mpp(&mpp_data);
 553         if (rc)
 554                 return rc;
 555
 556         if (entitlement) {
 557                 new_weight = mpp_data.mem_weight;
 558                 new_entitled = *entitlement;
 559         } else if (weight) {
 560                 new_weight = *weight;
 561                 new_entitled = mpp_data.entitled_mem;
 562         } else
 563                 return -EINVAL;
 564
 565         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 566                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 567
 568         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 569                  __func__, new_entitled, new_weight);
 570
 571         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 572         return rc;
 573 }
 574
 575 /*
 576  * Interface for changing system parameters (variable capacity weight
 577  * and entitled capacity).  Format of input is "param_name=value";
 578  * anything after value is ignored.  Valid parameters at this time are
 579  * "partition_entitled_capacity" and "capacity_weight".  We use
 580  * H_SET_PPP to alter parameters.
 581  *
 582  * This function should be invoked only on systems with
 583  * FW_FEATURE_SPLPAR.
 584  */
 585 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 586                              size_t count, loff_t * off)
 587 {
 588         char kbuf[64];
 589         char *tmp;
 590         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 591         u8 new_weight, *new_weight_ptr = &new_weight;
 592         ssize_t retval;
 593
 594         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 595                 return -EINVAL;
 596
 597         if (count > sizeof(kbuf))
 598                 return -EINVAL;
 599
 600         if (copy_from_user(kbuf, buf, count))
 601                 return -EFAULT;
 602
 603         kbuf[count - 1] = '\0';
 604         tmp = strchr(kbuf, '=');
 605         if (!tmp)
 606                 return -EINVAL;
 607
 608         *tmp++ = '\0';
 609
 610         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 611                 char *endp;
 612                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 613                 if (endp == tmp)
 614                         return -EINVAL;
 615
 616                 retval = update_ppp(new_entitled_ptr, NULL);
 617         } else if (!strcmp(kbuf, "capacity_weight")) {
 618                 char *endp;
 619                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 620                 if (endp == tmp)
 621                         return -EINVAL;
 622
 623                 retval = update_ppp(NULL, new_weight_ptr);
 624         } else if (!strcmp(kbuf, "entitled_memory")) {
 625                 char *endp;
 626                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 627                 if (endp == tmp)
 628                         return -EINVAL;
 629
 630                 retval = update_mpp(new_entitled_ptr, NULL);
 631         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 632                 char *endp;
 633                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 634                 if (endp == tmp)
 635                         return -EINVAL;
 636
 637                 retval = update_mpp(NULL, new_weight_ptr);
 638         } else
 639                 return -EINVAL;
 640
 641         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 642                 retval = count;
 643         } else if (retval == H_BUSY) {
 644                 retval = -EBUSY;
 645         } else if (retval == H_HARDWARE) {
 646                 retval = -EIO;
 647         } else if (retval == H_PARAMETER) {
 648                 retval = -EINVAL;
 649         }
 650
 651         return retval;
 652 }
 653
 654 static int lparcfg_data(struct seq_file *m, void *v)
 655 {
 656         struct device_node *rootdn;
 657         const char *model = "";
 658         const char *system_id = "";
 659         const char *tmp;
 660         const __be32 *lp_index_ptr;
 661         unsigned int lp_index = 0;
 662
 663         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
 664
 665         rootdn = of_find_node_by_path("/");
 666         if (rootdn) {
 667                 tmp = of_get_property(rootdn, "model", NULL);
 668                 if (tmp)
 669                         model = tmp;
 670                 tmp = of_get_property(rootdn, "system-id", NULL);
 671                 if (tmp)
 672                         system_id = tmp;
 673                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 674                                         NULL);
 675                 if (lp_index_ptr)
 676                         lp_index = be32_to_cpup(lp_index_ptr);
 677                 of_node_put(rootdn);
 678         }
 679         seq_printf(m, "serial_number=%s\n", system_id);
 680         seq_printf(m, "system_type=%s\n", model);
 681         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 682
 683         return pseries_lparcfg_data(m, v);
 684 }
 685
 686 static int lparcfg_open(struct inode *inode, struct file *file)
 687 {
 688         return single_open(file, lparcfg_data, NULL);
 689 }
 690
 691 static const struct file_operations lparcfg_fops = {
 692         .read           = seq_read,
 693         .write          = lparcfg_write,
 694         .open           = lparcfg_open,
 695         .release        = single_release,
 696         .llseek         = seq_lseek,
 697 };
 698
 699 static int __init lparcfg_init(void)
 700 {
 701         umode_t mode = 0444;
 702
 703         /* Allow writing if we have FW_FEATURE_SPLPAR */
 704         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 705                 mode |= 0200;
 706
 707         if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops)) {
 708                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
 709                 return -EIO;
 710         }
 711         return 0;
 712 }
 713 machine_device_initcall(pseries, lparcfg_init);