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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 /*
 162  * H_GET_PPP hcall returns info in 4 parms.
 163  *  entitled_capacity,unallocated_capacity,
 164  *  aggregation, resource_capability).
 165  *
 166  *  R4 = Entitled Processor Capacity Percentage.
 167  *  R5 = Unallocated Processor Capacity Percentage.
 168  *  R6 (AABBCCDDEEFFGGHH).
 169  *      XXXX - reserved (0)
 170  *          XXXX - reserved (0)
 171  *              XXXX - Group Number
 172  *                  XXXX - Pool Number.
 173  *  R7 (IIJJKKLLMMNNOOPP).
 174  *      XX - reserved. (0)
 175  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 176  *          XX - variable processor Capacity Weight
 177  *            XX - Unallocated Variable Processor Capacity Weight.
 178  *              XXXX - Active processors in Physical Processor Pool.
 179  *                  XXXX  - Processors active on platform.
 180  */
 181 static unsigned int h_get_ppp(unsigned long *entitled,
 182                               unsigned long *unallocated,
 183                               unsigned long *aggregation,
 184                               unsigned long *resource)
 185 {
 186         unsigned long rc;
 187         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 188
 189         rc = plpar_hcall(H_GET_PPP, retbuf);
 190
 191         *entitled = retbuf[0];
 192         *unallocated = retbuf[1];
 193         *aggregation = retbuf[2];
 194         *resource = retbuf[3];
 195
 196         return rc;
 197 }
 198
 199 static unsigned h_pic(unsigned long *pool_idle_time,
 200                       unsigned long *num_procs)
 201 {
 202         unsigned long rc;
 203         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 204
 205         rc = plpar_hcall(H_PIC, retbuf);
 206
 207         *pool_idle_time = retbuf[0];
 208         *num_procs = retbuf[1];
 209
 210         return rc;
 211 }
 212
 213 /*
 214  * parse_ppp_data
 215  * Parse out the data returned from h_get_ppp and h_pic
 216  */
 217 static void parse_ppp_data(struct seq_file *m)
 218 {
 219         unsigned long h_entitled, h_unallocated;
 220         unsigned long h_aggregation, h_resource;
 221         int rc;
 222
 223         rc = h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
 224                        &h_resource);
 225         if (rc)
 226                 return;
 227
 228         seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
 229         seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
 230         seq_printf(m, "system_active_processors=%ld\n",
 231                    (h_resource >> 0 * 8) & 0xffff);
 232
 233         /* pool related entries are apropriate for shared configs */
 234         if (lppaca[0].shared_proc) {
 235                 unsigned long pool_idle_time, pool_procs;
 236
 237                 seq_printf(m, "pool=%ld\n", (h_aggregation >> 0 * 8) & 0xffff);
 238
 239                 /* report pool_capacity in percentage */
 240                 seq_printf(m, "pool_capacity=%ld\n",
 241                            ((h_resource >> 2 * 8) & 0xffff) * 100);
 242
 243                 h_pic(&pool_idle_time, &pool_procs);
 244                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 245                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 246         }
 247
 248         seq_printf(m, "unallocated_capacity_weight=%ld\n",
 249                    (h_resource >> 4 * 8) & 0xFF);
 250
 251         seq_printf(m, "capacity_weight=%ld\n", (h_resource >> 5 * 8) & 0xFF);
 252         seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
 253         seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
 254 }
 255
 256 /**
 257  * parse_mpp_data
 258  * Parse out data returned from h_get_mpp
 259  */
 260 static void parse_mpp_data(struct seq_file *m)
 261 {
 262         struct hvcall_mpp_data mpp_data;
 263         int rc;
 264
 265         rc = h_get_mpp(&mpp_data);
 266         if (rc)
 267                 return;
 268
 269         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 270
 271         if (mpp_data.mapped_mem != -1)
 272                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 273                            mpp_data.mapped_mem);
 274
 275         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 276         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 277
 278         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 279         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 280                    mpp_data.unallocated_mem_weight);
 281         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 282                    mpp_data.unallocated_entitlement);
 283
 284         if (mpp_data.pool_size != -1)
 285                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 286                            mpp_data.pool_size);
 287
 288         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 289                    mpp_data.loan_request);
 290
 291         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 292 }
 293
 294 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 295 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 296
 297 /*
 298  * parse_system_parameter_string()
 299  * Retrieve the potential_processors, max_entitled_capacity and friends
 300  * through the get-system-parameter rtas call.  Replace keyword strings as
 301  * necessary.
 302  */
 303 static void parse_system_parameter_string(struct seq_file *m)
 304 {
 305         int call_status;
 306
 307         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 308         if (!local_buffer) {
 309                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 310                        __FILE__, __func__, __LINE__);
 311                 return;
 312         }
 313
 314         spin_lock(&rtas_data_buf_lock);
 315         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 316         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 317                                 NULL,
 318                                 SPLPAR_CHARACTERISTICS_TOKEN,
 319                                 __pa(rtas_data_buf),
 320                                 RTAS_DATA_BUF_SIZE);
 321         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 322         spin_unlock(&rtas_data_buf_lock);
 323
 324         if (call_status != 0) {
 325                 printk(KERN_INFO
 326                        "%s %s Error calling get-system-parameter (0x%x)\n",
 327                        __FILE__, __func__, call_status);
 328         } else {
 329                 int splpar_strlen;
 330                 int idx, w_idx;
 331                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 332                 if (!workbuffer) {
 333                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 334                                __FILE__, __func__, __LINE__);
 335                         kfree(local_buffer);
 336                         return;
 337                 }
 338 #ifdef LPARCFG_DEBUG
 339                 printk(KERN_INFO "success calling get-system-parameter \n");
 340 #endif
 341                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 342                 local_buffer += 2;      /* step over strlen value */
 343
 344                 w_idx = 0;
 345                 idx = 0;
 346                 while ((*local_buffer) && (idx < splpar_strlen)) {
 347                         workbuffer[w_idx++] = local_buffer[idx++];
 348                         if ((local_buffer[idx] == ',')
 349                             || (local_buffer[idx] == '\0')) {
 350                                 workbuffer[w_idx] = '\0';
 351                                 if (w_idx) {
 352                                         /* avoid the empty string */
 353                                         seq_printf(m, "%s\n", workbuffer);
 354                                 }
 355                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 356                                 idx++;  /* skip the comma */
 357                                 w_idx = 0;
 358                         } else if (local_buffer[idx] == '=') {
 359                                 /* code here to replace workbuffer contents
 360                                    with different keyword strings */
 361                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 362                                         strcpy(workbuffer,
 363                                                "partition_max_entitled_capacity");
 364                                         w_idx = strlen(workbuffer);
 365                                 }
 366                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 367                                         strcpy(workbuffer,
 368                                                "system_potential_processors");
 369                                         w_idx = strlen(workbuffer);
 370                                 }
 371                         }
 372                 }
 373                 kfree(workbuffer);
 374                 local_buffer -= 2;      /* back up over strlen value */
 375         }
 376         kfree(local_buffer);
 377 }
 378
 379 /* Return the number of processors in the system.
 380  * This function reads through the device tree and counts
 381  * the virtual processors, this does not include threads.
 382  */
 383 static int lparcfg_count_active_processors(void)
 384 {
 385         struct device_node *cpus_dn = NULL;
 386         int count = 0;
 387
 388         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 389 #ifdef LPARCFG_DEBUG
 390                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
 391 #endif
 392                 count++;
 393         }
 394         return count;
 395 }
 396
 397 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 398 {
 399         int partition_potential_processors;
 400         int partition_active_processors;
 401         struct device_node *rtas_node;
 402         const int *lrdrp = NULL;
 403
 404         rtas_node = of_find_node_by_path("/rtas");
 405         if (rtas_node)
 406                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 407
 408         if (lrdrp == NULL) {
 409                 partition_potential_processors = vdso_data->processorCount;
 410         } else {
 411                 partition_potential_processors = *(lrdrp + 4);
 412         }
 413         of_node_put(rtas_node);
 414
 415         partition_active_processors = lparcfg_count_active_processors();
 416
 417         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 418                 /* this call handles the ibm,get-system-parameter contents */
 419                 parse_system_parameter_string(m);
 420                 parse_ppp_data(m);
 421                 parse_mpp_data(m);
 422
 423                 seq_printf(m, "purr=%ld\n", get_purr());
 424         } else {                /* non SPLPAR case */
 425
 426                 seq_printf(m, "system_active_processors=%d\n",
 427                            partition_potential_processors);
 428
 429                 seq_printf(m, "system_potential_processors=%d\n",
 430                            partition_potential_processors);
 431
 432                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 433                            partition_potential_processors * 100);
 434
 435                 seq_printf(m, "partition_entitled_capacity=%d\n",
 436                            partition_active_processors * 100);
 437         }
 438
 439         seq_printf(m, "partition_active_processors=%d\n",
 440                    partition_active_processors);
 441
 442         seq_printf(m, "partition_potential_processors=%d\n",
 443                    partition_potential_processors);
 444
 445         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 446
 447         return 0;
 448 }
 449
 450 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 451 {
 452         unsigned long current_entitled;
 453         unsigned long dummy;
 454         unsigned long resource;
 455         u8 current_weight, new_weight;
 456         u64 new_entitled;
 457         ssize_t retval;
 458
 459         /* Get our current parameters */
 460         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
 461         if (retval)
 462                 return retval;
 463
 464         current_weight = (resource >> 5 * 8) & 0xFF;
 465
 466         if (entitlement) {
 467                 new_weight = current_weight;
 468                 new_entitled = *entitlement;
 469         } else if (weight) {
 470                 new_weight = *weight;
 471                 new_entitled = current_entitled;
 472         } else
 473                 return -EINVAL;
 474
 475         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 476                  __FUNCTION__, current_entitled, current_weight);
 477
 478         pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
 479                  __FUNCTION__, new_entitled, new_weight);
 480
 481         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 482         return retval;
 483 }
 484
 485 /**
 486  * update_mpp
 487  *
 488  * Update the memory entitlement and weight for the partition.  Caller must
 489  * specify either a new entitlement or weight, not both, to be updated
 490  * since the h_set_mpp call takes both entitlement and weight as parameters.
 491  */
 492 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 493 {
 494         struct hvcall_mpp_data mpp_data;
 495         u64 new_entitled;
 496         u8 new_weight;
 497         ssize_t rc;
 498
 499         rc = h_get_mpp(&mpp_data);
 500         if (rc)
 501                 return rc;
 502
 503         if (entitlement) {
 504                 new_weight = mpp_data.mem_weight;
 505                 new_entitled = *entitlement;
 506         } else if (weight) {
 507                 new_weight = *weight;
 508                 new_entitled = mpp_data.entitled_mem;
 509         } else
 510                 return -EINVAL;
 511
 512         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 513                  __FUNCTION__, mpp_data.entitled_mem, mpp_data.mem_weight);
 514
 515         pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
 516                  __FUNCTION__, new_entitled, new_weight);
 517
 518         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 519         return rc;
 520 }
 521
 522 /*
 523  * Interface for changing system parameters (variable capacity weight
 524  * and entitled capacity).  Format of input is "param_name=value";
 525  * anything after value is ignored.  Valid parameters at this time are
 526  * "partition_entitled_capacity" and "capacity_weight".  We use
 527  * H_SET_PPP to alter parameters.
 528  *
 529  * This function should be invoked only on systems with
 530  * FW_FEATURE_SPLPAR.
 531  */
 532 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 533                              size_t count, loff_t * off)
 534 {
 535         char *kbuf;
 536         char *tmp;
 537         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 538         u8 new_weight, *new_weight_ptr = &new_weight;
 539         ssize_t retval = -ENOMEM;
 540
 541         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
 542                         firmware_has_feature(FW_FEATURE_ISERIES))
 543                 return -EINVAL;
 544
 545         kbuf = kmalloc(count, GFP_KERNEL);
 546         if (!kbuf)
 547                 goto out;
 548
 549         retval = -EFAULT;
 550         if (copy_from_user(kbuf, buf, count))
 551                 goto out;
 552
 553         retval = -EINVAL;
 554         kbuf[count - 1] = '\0';
 555         tmp = strchr(kbuf, '=');
 556         if (!tmp)
 557                 goto out;
 558
 559         *tmp++ = '\0';
 560
 561         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 562                 char *endp;
 563                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 564                 if (endp == tmp)
 565                         goto out;
 566
 567                 retval = update_ppp(new_entitled_ptr, NULL);
 568         } else if (!strcmp(kbuf, "capacity_weight")) {
 569                 char *endp;
 570                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 571                 if (endp == tmp)
 572                         goto out;
 573
 574                 retval = update_ppp(NULL, new_weight_ptr);
 575         } else if (!strcmp(kbuf, "entitled_memory")) {
 576                 char *endp;
 577                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 578                 if (endp == tmp)
 579                         goto out;
 580
 581                 retval = update_mpp(new_entitled_ptr, NULL);
 582         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 583                 char *endp;
 584                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 585                 if (endp == tmp)
 586                         goto out;
 587
 588                 retval = update_mpp(NULL, new_weight_ptr);
 589         } else
 590                 goto out;
 591
 592         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 593                 retval = count;
 594         } else if (retval == H_BUSY) {
 595                 retval = -EBUSY;
 596         } else if (retval == H_HARDWARE) {
 597                 retval = -EIO;
 598         } else if (retval == H_PARAMETER) {
 599                 retval = -EINVAL;
 600         } else {
 601                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
 602                        __func__, retval);
 603                 retval = -EIO;
 604         }
 605
 606 out:
 607         kfree(kbuf);
 608         return retval;
 609 }
 610
 611 #else                           /* CONFIG_PPC_PSERIES */
 612
 613 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 614 {
 615         return 0;
 616 }
 617
 618 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 619                              size_t count, loff_t * off)
 620 {
 621         return -EINVAL;
 622 }
 623
 624 #endif                          /* CONFIG_PPC_PSERIES */
 625
 626 static int lparcfg_data(struct seq_file *m, void *v)
 627 {
 628         struct device_node *rootdn;
 629         const char *model = "";
 630         const char *system_id = "";
 631         const char *tmp;
 632         const unsigned int *lp_index_ptr;
 633         unsigned int lp_index = 0;
 634
 635         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 636
 637         rootdn = of_find_node_by_path("/");
 638         if (rootdn) {
 639                 tmp = of_get_property(rootdn, "model", NULL);
 640                 if (tmp) {
 641                         model = tmp;
 642                         /* Skip "IBM," - see platforms/iseries/dt.c */
 643                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 644                                 model += 4;
 645                 }
 646                 tmp = of_get_property(rootdn, "system-id", NULL);
 647                 if (tmp) {
 648                         system_id = tmp;
 649                         /* Skip "IBM," - see platforms/iseries/dt.c */
 650                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 651                                 system_id += 4;
 652                 }
 653                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 654                                         NULL);
 655                 if (lp_index_ptr)
 656                         lp_index = *lp_index_ptr;
 657                 of_node_put(rootdn);
 658         }
 659         seq_printf(m, "serial_number=%s\n", system_id);
 660         seq_printf(m, "system_type=%s\n", model);
 661         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 662
 663         if (firmware_has_feature(FW_FEATURE_ISERIES))
 664                 return iseries_lparcfg_data(m, v);
 665         return pseries_lparcfg_data(m, v);
 666 }
 667
 668 static int lparcfg_open(struct inode *inode, struct file *file)
 669 {
 670         return single_open(file, lparcfg_data, NULL);
 671 }
 672
 673 static const struct file_operations lparcfg_fops = {
 674         .owner          = THIS_MODULE,
 675         .read           = seq_read,
 676         .write          = lparcfg_write,
 677         .open           = lparcfg_open,
 678         .release        = single_release,
 679 };
 680
 681 static int __init lparcfg_init(void)
 682 {
 683         struct proc_dir_entry *ent;
 684         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 685
 686         /* Allow writing if we have FW_FEATURE_SPLPAR */
 687         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
 688                         !firmware_has_feature(FW_FEATURE_ISERIES))
 689                 mode |= S_IWUSR;
 690
 691         ent = proc_create("ppc64/lparcfg", mode, NULL, &lparcfg_fops);
 692         if (!ent) {
 693                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
 694                 return -EIO;
 695         }
 696
 697         proc_ppc64_lparcfg = ent;
 698         return 0;
 699 }
 700
 701 static void __exit lparcfg_cleanup(void)
 702 {
 703         if (proc_ppc64_lparcfg)
 704                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 705 }
 706
 707 module_init(lparcfg_init);
 708 module_exit(lparcfg_cleanup);
 709 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 710 MODULE_AUTHOR("Dave Engebretsen");
 711 MODULE_LICENSE("GPL");