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
  41 #define MODULE_VERS "1.9"
  42 #define MODULE_NAME "lparcfg"
  43
  44 /* #define LPARCFG_DEBUG */
  45
  46 static struct proc_dir_entry *proc_ppc64_lparcfg;
  47
  48 /*
  49  * Track sum of all purrs across all processors. This is used to further
  50  * calculate usage values by different applications
  51  */
  52 static unsigned long get_purr(void)
  53 {
  54         unsigned long sum_purr = 0;
  55         int cpu;
  56
  57         for_each_possible_cpu(cpu) {
  58                 if (firmware_has_feature(FW_FEATURE_ISERIES))
  59                         sum_purr += lppaca[cpu].emulated_time_base;
  60                 else {
  61                         struct cpu_usage *cu;
  62
  63                         cu = &per_cpu(cpu_usage_array, cpu);
  64                         sum_purr += cu->current_tb;
  65                 }
  66         }
  67         return sum_purr;
  68 }
  69
  70 #ifdef CONFIG_PPC_ISERIES
  71
  72 /*
  73  * Methods used to fetch LPAR data when running on an iSeries platform.
  74  */
  75 static int iseries_lparcfg_data(struct seq_file *m, void *v)
  76 {
  77         unsigned long pool_id;
  78         int shared, entitled_capacity, max_entitled_capacity;
  79         int processors, max_processors;
  80         unsigned long purr = get_purr();
  81
  82         shared = (int)(local_paca->lppaca_ptr->shared_proc);
  83
  84         seq_printf(m, "system_active_processors=%d\n",
  85                    (int)HvLpConfig_getSystemPhysicalProcessors());
  86
  87         seq_printf(m, "system_potential_processors=%d\n",
  88                    (int)HvLpConfig_getSystemPhysicalProcessors());
  89
  90         processors = (int)HvLpConfig_getPhysicalProcessors();
  91         seq_printf(m, "partition_active_processors=%d\n", processors);
  92
  93         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
  94         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
  95
  96         if (shared) {
  97                 entitled_capacity = HvLpConfig_getSharedProcUnits();
  98                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
  99         } else {
 100                 entitled_capacity = processors * 100;
 101                 max_entitled_capacity = max_processors * 100;
 102         }
 103         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
 104
 105         seq_printf(m, "partition_max_entitled_capacity=%d\n",
 106                    max_entitled_capacity);
 107
 108         if (shared) {
 109                 pool_id = HvLpConfig_getSharedPoolIndex();
 110                 seq_printf(m, "pool=%d\n", (int)pool_id);
 111                 seq_printf(m, "pool_capacity=%d\n",
 112                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
 113                                  100));
 114                 seq_printf(m, "purr=%ld\n", purr);
 115         }
 116
 117         seq_printf(m, "shared_processor_mode=%d\n", shared);
 118
 119         return 0;
 120 }
 121
 122 #else                           /* CONFIG_PPC_ISERIES */
 123
 124 static int iseries_lparcfg_data(struct seq_file *m, void *v)
 125 {
 126         return 0;
 127 }
 128
 129 #endif                          /* CONFIG_PPC_ISERIES */
 130
 131 #ifdef CONFIG_PPC_PSERIES
 132 /*
 133  * Methods used to fetch LPAR data when running on a pSeries platform.
 134  */
 135 /**
 136  * h_get_mpp
 137  * H_GET_MPP hcall returns info in 7 parms
 138  */
 139 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
 140 {
 141         int rc;
 142         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 143
 144         rc = plpar_hcall9(H_GET_MPP, retbuf);
 145
 146         mpp_data->entitled_mem = retbuf[0];
 147         mpp_data->mapped_mem = retbuf[1];
 148
 149         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 150         mpp_data->pool_num = retbuf[2] & 0xffff;
 151
 152         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
 153         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
 154         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffff;
 155
 156         mpp_data->pool_size = retbuf[4];
 157         mpp_data->loan_request = retbuf[5];
 158         mpp_data->backing_mem = retbuf[6];
 159
 160         return rc;
 161 }
 162 EXPORT_SYMBOL(h_get_mpp);
 163
 164 struct hvcall_ppp_data {
 165         u64     entitlement;
 166         u64     unallocated_entitlement;
 167         u16     group_num;
 168         u16     pool_num;
 169         u8      capped;
 170         u8      weight;
 171         u8      unallocated_weight;
 172         u16     active_procs_in_pool;
 173         u16     active_system_procs;
 174         u16     phys_platform_procs;
 175         u32     max_proc_cap_avail;
 176         u32     entitled_proc_cap_avail;
 177 };
 178
 179 /*
 180  * H_GET_PPP hcall returns info in 4 parms.
 181  *  entitled_capacity,unallocated_capacity,
 182  *  aggregation, resource_capability).
 183  *
 184  *  R4 = Entitled Processor Capacity Percentage.
 185  *  R5 = Unallocated Processor Capacity Percentage.
 186  *  R6 (AABBCCDDEEFFGGHH).
 187  *      XXXX - reserved (0)
 188  *          XXXX - reserved (0)
 189  *              XXXX - Group Number
 190  *                  XXXX - Pool Number.
 191  *  R7 (IIJJKKLLMMNNOOPP).
 192  *      XX - reserved. (0)
 193  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 194  *          XX - variable processor Capacity Weight
 195  *            XX - Unallocated Variable Processor Capacity Weight.
 196  *              XXXX - Active processors in Physical Processor Pool.
 197  *                  XXXX  - Processors active on platform.
 198  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
 199  *      XXXX - Physical platform procs allocated to virtualization.
 200  *          XXXXXX - Max procs capacity % available to the partitions pool.
 201  *                XXXXXX - Entitled procs capacity % available to the
 202  *                         partitions pool.
 203  */
 204 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 205 {
 206         unsigned long rc;
 207         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 208
 209         rc = plpar_hcall9(H_GET_PPP, retbuf);
 210
 211         ppp_data->entitlement = retbuf[0];
 212         ppp_data->unallocated_entitlement = retbuf[1];
 213
 214         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 215         ppp_data->pool_num = retbuf[2] & 0xffff;
 216
 217         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 218         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 219         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 220         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 221         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 222
 223         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
 224         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
 225         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
 226
 227         return rc;
 228 }
 229
 230 static unsigned h_pic(unsigned long *pool_idle_time,
 231                       unsigned long *num_procs)
 232 {
 233         unsigned long rc;
 234         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 235
 236         rc = plpar_hcall(H_PIC, retbuf);
 237
 238         *pool_idle_time = retbuf[0];
 239         *num_procs = retbuf[1];
 240
 241         return rc;
 242 }
 243
 244 /*
 245  * parse_ppp_data
 246  * Parse out the data returned from h_get_ppp and h_pic
 247  */
 248 static void parse_ppp_data(struct seq_file *m)
 249 {
 250         struct hvcall_ppp_data ppp_data;
 251         struct device_node *root;
 252         const int *perf_level;
 253         int rc;
 254
 255         rc = h_get_ppp(&ppp_data);
 256         if (rc)
 257                 return;
 258
 259         seq_printf(m, "partition_entitled_capacity=%lld\n",
 260                    ppp_data.entitlement);
 261         seq_printf(m, "group=%d\n", ppp_data.group_num);
 262         seq_printf(m, "system_active_processors=%d\n",
 263                    ppp_data.active_system_procs);
 264
 265         /* pool related entries are apropriate for shared configs */
 266         if (lppaca[0].shared_proc) {
 267                 unsigned long pool_idle_time, pool_procs;
 268
 269                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 270
 271                 /* report pool_capacity in percentage */
 272                 seq_printf(m, "pool_capacity=%d\n",
 273                            ppp_data.active_procs_in_pool * 100);
 274
 275                 h_pic(&pool_idle_time, &pool_procs);
 276                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 277                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 278         }
 279
 280         seq_printf(m, "unallocated_capacity_weight=%d\n",
 281                    ppp_data.unallocated_weight);
 282         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 283         seq_printf(m, "capped=%d\n", ppp_data.capped);
 284         seq_printf(m, "unallocated_capacity=%lld\n",
 285                    ppp_data.unallocated_entitlement);
 286
 287         /* The last bits of information returned from h_get_ppp are only
 288          * valid if the ibm,partition-performance-parameters-level
 289          * property is >= 1.
 290          */
 291         root = of_find_node_by_path("/");
 292         if (root) {
 293                 perf_level = of_get_property(root,
 294                                 "ibm,partition-performance-parameters-level",
 295                                              NULL);
 296                 if (perf_level && (*perf_level >= 1)) {
 297                         seq_printf(m,
 298                             "physical_procs_allocated_to_virtualization=%d\n",
 299                                    ppp_data.phys_platform_procs);
 300                         seq_printf(m, "max_proc_capacity_available=%d\n",
 301                                    ppp_data.max_proc_cap_avail);
 302                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 303                                    ppp_data.entitled_proc_cap_avail);
 304                 }
 305
 306                 of_node_put(root);
 307         }
 308 }
 309
 310 /**
 311  * parse_mpp_data
 312  * Parse out data returned from h_get_mpp
 313  */
 314 static void parse_mpp_data(struct seq_file *m)
 315 {
 316         struct hvcall_mpp_data mpp_data;
 317         int rc;
 318
 319         rc = h_get_mpp(&mpp_data);
 320         if (rc)
 321                 return;
 322
 323         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 324
 325         if (mpp_data.mapped_mem != -1)
 326                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 327                            mpp_data.mapped_mem);
 328
 329         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 330         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 331
 332         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 333         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 334                    mpp_data.unallocated_mem_weight);
 335         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 336                    mpp_data.unallocated_entitlement);
 337
 338         if (mpp_data.pool_size != -1)
 339                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 340                            mpp_data.pool_size);
 341
 342         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 343                    mpp_data.loan_request);
 344
 345         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 346 }
 347
 348 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 349 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 350
 351 /*
 352  * parse_system_parameter_string()
 353  * Retrieve the potential_processors, max_entitled_capacity and friends
 354  * through the get-system-parameter rtas call.  Replace keyword strings as
 355  * necessary.
 356  */
 357 static void parse_system_parameter_string(struct seq_file *m)
 358 {
 359         int call_status;
 360
 361         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 362         if (!local_buffer) {
 363                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 364                        __FILE__, __func__, __LINE__);
 365                 return;
 366         }
 367
 368         spin_lock(&rtas_data_buf_lock);
 369         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 370         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 371                                 NULL,
 372                                 SPLPAR_CHARACTERISTICS_TOKEN,
 373                                 __pa(rtas_data_buf),
 374                                 RTAS_DATA_BUF_SIZE);
 375         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 376         spin_unlock(&rtas_data_buf_lock);
 377
 378         if (call_status != 0) {
 379                 printk(KERN_INFO
 380                        "%s %s Error calling get-system-parameter (0x%x)\n",
 381                        __FILE__, __func__, call_status);
 382         } else {
 383                 int splpar_strlen;
 384                 int idx, w_idx;
 385                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 386                 if (!workbuffer) {
 387                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 388                                __FILE__, __func__, __LINE__);
 389                         kfree(local_buffer);
 390                         return;
 391                 }
 392 #ifdef LPARCFG_DEBUG
 393                 printk(KERN_INFO "success calling get-system-parameter\n");
 394 #endif
 395                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 396                 local_buffer += 2;      /* step over strlen value */
 397
 398                 w_idx = 0;
 399                 idx = 0;
 400                 while ((*local_buffer) && (idx < splpar_strlen)) {
 401                         workbuffer[w_idx++] = local_buffer[idx++];
 402                         if ((local_buffer[idx] == ',')
 403                             || (local_buffer[idx] == '\0')) {
 404                                 workbuffer[w_idx] = '\0';
 405                                 if (w_idx) {
 406                                         /* avoid the empty string */
 407                                         seq_printf(m, "%s\n", workbuffer);
 408                                 }
 409                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 410                                 idx++;  /* skip the comma */
 411                                 w_idx = 0;
 412                         } else if (local_buffer[idx] == '=') {
 413                                 /* code here to replace workbuffer contents
 414                                    with different keyword strings */
 415                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 416                                         strcpy(workbuffer,
 417                                                "partition_max_entitled_capacity");
 418                                         w_idx = strlen(workbuffer);
 419                                 }
 420                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 421                                         strcpy(workbuffer,
 422                                                "system_potential_processors");
 423                                         w_idx = strlen(workbuffer);
 424                                 }
 425                         }
 426                 }
 427                 kfree(workbuffer);
 428                 local_buffer -= 2;      /* back up over strlen value */
 429         }
 430         kfree(local_buffer);
 431 }
 432
 433 /* Return the number of processors in the system.
 434  * This function reads through the device tree and counts
 435  * the virtual processors, this does not include threads.
 436  */
 437 static int lparcfg_count_active_processors(void)
 438 {
 439         struct device_node *cpus_dn = NULL;
 440         int count = 0;
 441
 442         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 443 #ifdef LPARCFG_DEBUG
 444                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
 445 #endif
 446                 count++;
 447         }
 448         return count;
 449 }
 450
 451 static void pseries_cmo_data(struct seq_file *m)
 452 {
 453         int cpu;
 454         unsigned long cmo_faults = 0;
 455         unsigned long cmo_fault_time = 0;
 456
 457         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 458
 459         if (!firmware_has_feature(FW_FEATURE_CMO))
 460                 return;
 461
 462         for_each_possible_cpu(cpu) {
 463                 cmo_faults += lppaca[cpu].cmo_faults;
 464                 cmo_fault_time += lppaca[cpu].cmo_fault_time;
 465         }
 466
 467         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 468         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 469                    cmo_fault_time / tb_ticks_per_usec);
 470         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 471         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 472         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 473 }
 474
 475 static void splpar_dispatch_data(struct seq_file *m)
 476 {
 477         int cpu;
 478         unsigned long dispatches = 0;
 479         unsigned long dispatch_dispersions = 0;
 480
 481         for_each_possible_cpu(cpu) {
 482                 dispatches += lppaca[cpu].yield_count;
 483                 dispatch_dispersions += lppaca[cpu].dispersion_count;
 484         }
 485
 486         seq_printf(m, "dispatches=%lu\n", dispatches);
 487         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 488 }
 489
 490 static void parse_em_data(struct seq_file *m)
 491 {
 492         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 493
 494         if (plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
 495                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
 496 }
 497
 498 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 499 {
 500         int partition_potential_processors;
 501         int partition_active_processors;
 502         struct device_node *rtas_node;
 503         const int *lrdrp = NULL;
 504
 505         rtas_node = of_find_node_by_path("/rtas");
 506         if (rtas_node)
 507                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 508
 509         if (lrdrp == NULL) {
 510                 partition_potential_processors = vdso_data->processorCount;
 511         } else {
 512                 partition_potential_processors = *(lrdrp + 4);
 513         }
 514         of_node_put(rtas_node);
 515
 516         partition_active_processors = lparcfg_count_active_processors();
 517
 518         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 519                 /* this call handles the ibm,get-system-parameter contents */
 520                 parse_system_parameter_string(m);
 521                 parse_ppp_data(m);
 522                 parse_mpp_data(m);
 523                 pseries_cmo_data(m);
 524                 splpar_dispatch_data(m);
 525
 526                 seq_printf(m, "purr=%ld\n", get_purr());
 527         } else {                /* non SPLPAR case */
 528
 529                 seq_printf(m, "system_active_processors=%d\n",
 530                            partition_potential_processors);
 531
 532                 seq_printf(m, "system_potential_processors=%d\n",
 533                            partition_potential_processors);
 534
 535                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 536                            partition_potential_processors * 100);
 537
 538                 seq_printf(m, "partition_entitled_capacity=%d\n",
 539                            partition_active_processors * 100);
 540         }
 541
 542         seq_printf(m, "partition_active_processors=%d\n",
 543                    partition_active_processors);
 544
 545         seq_printf(m, "partition_potential_processors=%d\n",
 546                    partition_potential_processors);
 547
 548         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 549
 550         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 551
 552         parse_em_data(m);
 553
 554         return 0;
 555 }
 556
 557 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 558 {
 559         struct hvcall_ppp_data ppp_data;
 560         u8 new_weight;
 561         u64 new_entitled;
 562         ssize_t retval;
 563
 564         /* Get our current parameters */
 565         retval = h_get_ppp(&ppp_data);
 566         if (retval)
 567                 return retval;
 568
 569         if (entitlement) {
 570                 new_weight = ppp_data.weight;
 571                 new_entitled = *entitlement;
 572         } else if (weight) {
 573                 new_weight = *weight;
 574                 new_entitled = ppp_data.entitlement;
 575         } else
 576                 return -EINVAL;
 577
 578         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 579                  __func__, ppp_data.entitlement, ppp_data.weight);
 580
 581         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 582                  __func__, new_entitled, new_weight);
 583
 584         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 585         return retval;
 586 }
 587
 588 /**
 589  * update_mpp
 590  *
 591  * Update the memory entitlement and weight for the partition.  Caller must
 592  * specify either a new entitlement or weight, not both, to be updated
 593  * since the h_set_mpp call takes both entitlement and weight as parameters.
 594  */
 595 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 596 {
 597         struct hvcall_mpp_data mpp_data;
 598         u64 new_entitled;
 599         u8 new_weight;
 600         ssize_t rc;
 601
 602         if (entitlement) {
 603                 /* Check with vio to ensure the new memory entitlement
 604                  * can be handled.
 605                  */
 606                 rc = vio_cmo_entitlement_update(*entitlement);
 607                 if (rc)
 608                         return rc;
 609         }
 610
 611         rc = h_get_mpp(&mpp_data);
 612         if (rc)
 613                 return rc;
 614
 615         if (entitlement) {
 616                 new_weight = mpp_data.mem_weight;
 617                 new_entitled = *entitlement;
 618         } else if (weight) {
 619                 new_weight = *weight;
 620                 new_entitled = mpp_data.entitled_mem;
 621         } else
 622                 return -EINVAL;
 623
 624         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 625                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 626
 627         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 628                  __func__, new_entitled, new_weight);
 629
 630         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 631         return rc;
 632 }
 633
 634 /*
 635  * Interface for changing system parameters (variable capacity weight
 636  * and entitled capacity).  Format of input is "param_name=value";
 637  * anything after value is ignored.  Valid parameters at this time are
 638  * "partition_entitled_capacity" and "capacity_weight".  We use
 639  * H_SET_PPP to alter parameters.
 640  *
 641  * This function should be invoked only on systems with
 642  * FW_FEATURE_SPLPAR.
 643  */
 644 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 645                              size_t count, loff_t * off)
 646 {
 647         int kbuf_sz = 64;
 648         char kbuf[kbuf_sz];
 649         char *tmp;
 650         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 651         u8 new_weight, *new_weight_ptr = &new_weight;
 652         ssize_t retval;
 653
 654         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
 655                         firmware_has_feature(FW_FEATURE_ISERIES))
 656                 return -EINVAL;
 657
 658         if (count > kbuf_sz)
 659                 return -EINVAL;
 660
 661         if (copy_from_user(kbuf, buf, count))
 662                 return -EFAULT;
 663
 664         kbuf[count - 1] = '\0';
 665         tmp = strchr(kbuf, '=');
 666         if (!tmp)
 667                 return -EINVAL;
 668
 669         *tmp++ = '\0';
 670
 671         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 672                 char *endp;
 673                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 674                 if (endp == tmp)
 675                         return -EINVAL;
 676
 677                 retval = update_ppp(new_entitled_ptr, NULL);
 678         } else if (!strcmp(kbuf, "capacity_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_ppp(NULL, new_weight_ptr);
 685         } else if (!strcmp(kbuf, "entitled_memory")) {
 686                 char *endp;
 687                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 688                 if (endp == tmp)
 689                         return -EINVAL;
 690
 691                 retval = update_mpp(new_entitled_ptr, NULL);
 692         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 693                 char *endp;
 694                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 695                 if (endp == tmp)
 696                         return -EINVAL;
 697
 698                 retval = update_mpp(NULL, new_weight_ptr);
 699         } else
 700                 return -EINVAL;
 701
 702         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 703                 retval = count;
 704         } else if (retval == H_BUSY) {
 705                 retval = -EBUSY;
 706         } else if (retval == H_HARDWARE) {
 707                 retval = -EIO;
 708         } else if (retval == H_PARAMETER) {
 709                 retval = -EINVAL;
 710         }
 711
 712         return retval;
 713 }
 714
 715 #else                           /* CONFIG_PPC_PSERIES */
 716
 717 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 718 {
 719         return 0;
 720 }
 721
 722 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 723                              size_t count, loff_t * off)
 724 {
 725         return -EINVAL;
 726 }
 727
 728 #endif                          /* CONFIG_PPC_PSERIES */
 729
 730 static int lparcfg_data(struct seq_file *m, void *v)
 731 {
 732         struct device_node *rootdn;
 733         const char *model = "";
 734         const char *system_id = "";
 735         const char *tmp;
 736         const unsigned int *lp_index_ptr;
 737         unsigned int lp_index = 0;
 738
 739         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
 740
 741         rootdn = of_find_node_by_path("/");
 742         if (rootdn) {
 743                 tmp = of_get_property(rootdn, "model", NULL);
 744                 if (tmp) {
 745                         model = tmp;
 746                         /* Skip "IBM," - see platforms/iseries/dt.c */
 747                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 748                                 model += 4;
 749                 }
 750                 tmp = of_get_property(rootdn, "system-id", NULL);
 751                 if (tmp) {
 752                         system_id = tmp;
 753                         /* Skip "IBM," - see platforms/iseries/dt.c */
 754                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 755                                 system_id += 4;
 756                 }
 757                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 758                                         NULL);
 759                 if (lp_index_ptr)
 760                         lp_index = *lp_index_ptr;
 761                 of_node_put(rootdn);
 762         }
 763         seq_printf(m, "serial_number=%s\n", system_id);
 764         seq_printf(m, "system_type=%s\n", model);
 765         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 766
 767         if (firmware_has_feature(FW_FEATURE_ISERIES))
 768                 return iseries_lparcfg_data(m, v);
 769         return pseries_lparcfg_data(m, v);
 770 }
 771
 772 static int lparcfg_open(struct inode *inode, struct file *file)
 773 {
 774         return single_open(file, lparcfg_data, NULL);
 775 }
 776
 777 static const struct file_operations lparcfg_fops = {
 778         .owner          = THIS_MODULE,
 779         .read           = seq_read,
 780         .write          = lparcfg_write,
 781         .open           = lparcfg_open,
 782         .release        = single_release,
 783 };
 784
 785 static int __init lparcfg_init(void)
 786 {
 787         struct proc_dir_entry *ent;
 788         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 789
 790         /* Allow writing if we have FW_FEATURE_SPLPAR */
 791         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
 792                         !firmware_has_feature(FW_FEATURE_ISERIES))
 793                 mode |= S_IWUSR;
 794
 795         ent = proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops);
 796         if (!ent) {
 797                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
 798                 return -EIO;
 799         }
 800
 801         proc_ppc64_lparcfg = ent;
 802         return 0;
 803 }
 804
 805 static void __exit lparcfg_cleanup(void)
 806 {
 807         if (proc_ppc64_lparcfg)
 808                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 809 }
 810
 811 module_init(lparcfg_init);
 812 module_exit(lparcfg_cleanup);
 813 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 814 MODULE_AUTHOR("Dave Engebretsen");
 815 MODULE_LICENSE("GPL");