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