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 <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 "1.7"
  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 static void log_plpar_hcall_return(unsigned long rc, char *tag)
 133 {
 134         switch(rc) {
 135         case 0:
 136                 return;
 137         case H_HARDWARE:
 138                 printk(KERN_INFO "plpar-hcall (%s) "
 139                                 "Hardware fault\n", tag);
 140                 return;
 141         case H_FUNCTION:
 142                 printk(KERN_INFO "plpar-hcall (%s) "
 143                                 "Function not allowed\n", tag);
 144                 return;
 145         case H_AUTHORITY:
 146                 printk(KERN_INFO "plpar-hcall (%s) "
 147                                 "Not authorized to this function\n", tag);
 148                 return;
 149         case H_PARAMETER:
 150                 printk(KERN_INFO "plpar-hcall (%s) "
 151                                 "Bad parameter(s)\n",tag);
 152                 return;
 153         default:
 154                 printk(KERN_INFO "plpar-hcall (%s) "
 155                                 "Unexpected rc(0x%lx)\n", tag, rc);
 156         }
 157 }
 158
 159 /*
 160  * H_GET_PPP hcall returns info in 4 parms.
 161  *  entitled_capacity,unallocated_capacity,
 162  *  aggregation, resource_capability).
 163  *
 164  *  R4 = Entitled Processor Capacity Percentage.
 165  *  R5 = Unallocated Processor Capacity Percentage.
 166  *  R6 (AABBCCDDEEFFGGHH).
 167  *      XXXX - reserved (0)
 168  *          XXXX - reserved (0)
 169  *              XXXX - Group Number
 170  *                  XXXX - Pool Number.
 171  *  R7 (IIJJKKLLMMNNOOPP).
 172  *      XX - reserved. (0)
 173  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 174  *          XX - variable processor Capacity Weight
 175  *            XX - Unallocated Variable Processor Capacity Weight.
 176  *              XXXX - Active processors in Physical Processor Pool.
 177  *                  XXXX  - Processors active on platform.
 178  */
 179 static unsigned int h_get_ppp(unsigned long *entitled,
 180                               unsigned long *unallocated,
 181                               unsigned long *aggregation,
 182                               unsigned long *resource)
 183 {
 184         unsigned long rc;
 185         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 186
 187         rc = plpar_hcall(H_GET_PPP, retbuf);
 188
 189         *entitled = retbuf[0];
 190         *unallocated = retbuf[1];
 191         *aggregation = retbuf[2];
 192         *resource = retbuf[3];
 193
 194         log_plpar_hcall_return(rc, "H_GET_PPP");
 195
 196         return rc;
 197 }
 198
 199 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
 200 {
 201         unsigned long rc;
 202         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 203
 204         rc = plpar_hcall(H_PIC, retbuf);
 205
 206         *pool_idle_time = retbuf[0];
 207         *num_procs = retbuf[1];
 208
 209         if (rc != H_AUTHORITY)
 210                 log_plpar_hcall_return(rc, "H_PIC");
 211 }
 212
 213 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 214 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 215
 216 /*
 217  * parse_system_parameter_string()
 218  * Retrieve the potential_processors, max_entitled_capacity and friends
 219  * through the get-system-parameter rtas call.  Replace keyword strings as
 220  * necessary.
 221  */
 222 static void parse_system_parameter_string(struct seq_file *m)
 223 {
 224         int call_status;
 225
 226         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 227         if (!local_buffer) {
 228                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 229                        __FILE__, __func__, __LINE__);
 230                 return;
 231         }
 232
 233         spin_lock(&rtas_data_buf_lock);
 234         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 235         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 236                                 NULL,
 237                                 SPLPAR_CHARACTERISTICS_TOKEN,
 238                                 __pa(rtas_data_buf),
 239                                 RTAS_DATA_BUF_SIZE);
 240         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 241         spin_unlock(&rtas_data_buf_lock);
 242
 243         if (call_status != 0) {
 244                 printk(KERN_INFO
 245                        "%s %s Error calling get-system-parameter (0x%x)\n",
 246                        __FILE__, __func__, call_status);
 247         } else {
 248                 int splpar_strlen;
 249                 int idx, w_idx;
 250                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 251                 if (!workbuffer) {
 252                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 253                                __FILE__, __func__, __LINE__);
 254                         kfree(local_buffer);
 255                         return;
 256                 }
 257 #ifdef LPARCFG_DEBUG
 258                 printk(KERN_INFO "success calling get-system-parameter \n");
 259 #endif
 260                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 261                 local_buffer += 2;      /* step over strlen value */
 262
 263                 w_idx = 0;
 264                 idx = 0;
 265                 while ((*local_buffer) && (idx < splpar_strlen)) {
 266                         workbuffer[w_idx++] = local_buffer[idx++];
 267                         if ((local_buffer[idx] == ',')
 268                             || (local_buffer[idx] == '\0')) {
 269                                 workbuffer[w_idx] = '\0';
 270                                 if (w_idx) {
 271                                         /* avoid the empty string */
 272                                         seq_printf(m, "%s\n", workbuffer);
 273                                 }
 274                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 275                                 idx++;  /* skip the comma */
 276                                 w_idx = 0;
 277                         } else if (local_buffer[idx] == '=') {
 278                                 /* code here to replace workbuffer contents
 279                                    with different keyword strings */
 280                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 281                                         strcpy(workbuffer,
 282                                                "partition_max_entitled_capacity");
 283                                         w_idx = strlen(workbuffer);
 284                                 }
 285                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 286                                         strcpy(workbuffer,
 287                                                "system_potential_processors");
 288                                         w_idx = strlen(workbuffer);
 289                                 }
 290                         }
 291                 }
 292                 kfree(workbuffer);
 293                 local_buffer -= 2;      /* back up over strlen value */
 294         }
 295         kfree(local_buffer);
 296 }
 297
 298 /* Return the number of processors in the system.
 299  * This function reads through the device tree and counts
 300  * the virtual processors, this does not include threads.
 301  */
 302 static int lparcfg_count_active_processors(void)
 303 {
 304         struct device_node *cpus_dn = NULL;
 305         int count = 0;
 306
 307         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 308 #ifdef LPARCFG_DEBUG
 309                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
 310 #endif
 311                 count++;
 312         }
 313         return count;
 314 }
 315
 316 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 317 {
 318         int partition_potential_processors;
 319         int partition_active_processors;
 320         struct device_node *rtas_node;
 321         const int *lrdrp = NULL;
 322
 323         rtas_node = of_find_node_by_path("/rtas");
 324         if (rtas_node)
 325                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 326
 327         if (lrdrp == NULL) {
 328                 partition_potential_processors = vdso_data->processorCount;
 329         } else {
 330                 partition_potential_processors = *(lrdrp + 4);
 331         }
 332         of_node_put(rtas_node);
 333
 334         partition_active_processors = lparcfg_count_active_processors();
 335
 336         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 337                 unsigned long h_entitled, h_unallocated;
 338                 unsigned long h_aggregation, h_resource;
 339                 unsigned long pool_idle_time, pool_procs;
 340                 unsigned long purr;
 341
 342                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
 343                           &h_resource);
 344
 345                 seq_printf(m, "R4=0x%lx\n", h_entitled);
 346                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
 347                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
 348                 seq_printf(m, "R7=0x%lx\n", h_resource);
 349
 350                 purr = get_purr();
 351
 352                 /* this call handles the ibm,get-system-parameter contents */
 353                 parse_system_parameter_string(m);
 354
 355                 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
 356
 357                 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
 358
 359                 seq_printf(m, "system_active_processors=%ld\n",
 360                            (h_resource >> 0 * 8) & 0xffff);
 361
 362                 /* pool related entries are apropriate for shared configs */
 363                 if (lppaca[0].shared_proc) {
 364
 365                         h_pic(&pool_idle_time, &pool_procs);
 366
 367                         seq_printf(m, "pool=%ld\n",
 368                                    (h_aggregation >> 0 * 8) & 0xffff);
 369
 370                         /* report pool_capacity in percentage */
 371                         seq_printf(m, "pool_capacity=%ld\n",
 372                                    ((h_resource >> 2 * 8) & 0xffff) * 100);
 373
 374                         seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 375
 376                         seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 377                 }
 378
 379                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
 380                            (h_resource >> 4 * 8) & 0xFF);
 381
 382                 seq_printf(m, "capacity_weight=%ld\n",
 383                            (h_resource >> 5 * 8) & 0xFF);
 384
 385                 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
 386
 387                 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
 388
 389                 seq_printf(m, "purr=%ld\n", purr);
 390
 391         } else {                /* non SPLPAR case */
 392
 393                 seq_printf(m, "system_active_processors=%d\n",
 394                            partition_potential_processors);
 395
 396                 seq_printf(m, "system_potential_processors=%d\n",
 397                            partition_potential_processors);
 398
 399                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 400                            partition_potential_processors * 100);
 401
 402                 seq_printf(m, "partition_entitled_capacity=%d\n",
 403                            partition_active_processors * 100);
 404         }
 405
 406         seq_printf(m, "partition_active_processors=%d\n",
 407                    partition_active_processors);
 408
 409         seq_printf(m, "partition_potential_processors=%d\n",
 410                    partition_potential_processors);
 411
 412         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 413
 414         return 0;
 415 }
 416
 417 /*
 418  * Interface for changing system parameters (variable capacity weight
 419  * and entitled capacity).  Format of input is "param_name=value";
 420  * anything after value is ignored.  Valid parameters at this time are
 421  * "partition_entitled_capacity" and "capacity_weight".  We use
 422  * H_SET_PPP to alter parameters.
 423  *
 424  * This function should be invoked only on systems with
 425  * FW_FEATURE_SPLPAR.
 426  */
 427 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 428                              size_t count, loff_t * off)
 429 {
 430         char *kbuf;
 431         char *tmp;
 432         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 433         u8 new_weight, *new_weight_ptr = &new_weight;
 434
 435         unsigned long current_entitled; /* parameters for h_get_ppp */
 436         unsigned long dummy;
 437         unsigned long resource;
 438         u8 current_weight;
 439
 440         ssize_t retval = -ENOMEM;
 441
 442         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
 443                         firmware_has_feature(FW_FEATURE_ISERIES))
 444                 return -EINVAL;
 445
 446         kbuf = kmalloc(count, GFP_KERNEL);
 447         if (!kbuf)
 448                 goto out;
 449
 450         retval = -EFAULT;
 451         if (copy_from_user(kbuf, buf, count))
 452                 goto out;
 453
 454         retval = -EINVAL;
 455         kbuf[count - 1] = '\0';
 456         tmp = strchr(kbuf, '=');
 457         if (!tmp)
 458                 goto out;
 459
 460         *tmp++ = '\0';
 461
 462         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 463                 char *endp;
 464                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 465                 if (endp == tmp)
 466                         goto out;
 467                 new_weight_ptr = &current_weight;
 468         } else if (!strcmp(kbuf, "capacity_weight")) {
 469                 char *endp;
 470                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 471                 if (endp == tmp)
 472                         goto out;
 473                 new_entitled_ptr = &current_entitled;
 474         } else
 475                 goto out;
 476
 477         /* Get our current parameters */
 478         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
 479         if (retval) {
 480                 retval = -EIO;
 481                 goto out;
 482         }
 483
 484         current_weight = (resource >> 5 * 8) & 0xFF;
 485
 486         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 487                  __func__, current_entitled, current_weight);
 488
 489         pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
 490                  __func__, *new_entitled_ptr, *new_weight_ptr);
 491
 492         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
 493                                     *new_weight_ptr);
 494
 495         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 496                 retval = count;
 497         } else if (retval == H_BUSY) {
 498                 retval = -EBUSY;
 499         } else if (retval == H_HARDWARE) {
 500                 retval = -EIO;
 501         } else if (retval == H_PARAMETER) {
 502                 retval = -EINVAL;
 503         } else {
 504                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
 505                        __func__, retval);
 506                 retval = -EIO;
 507         }
 508
 509 out:
 510         kfree(kbuf);
 511         return retval;
 512 }
 513
 514 #else                           /* CONFIG_PPC_PSERIES */
 515
 516 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 517 {
 518         return 0;
 519 }
 520
 521 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 522                              size_t count, loff_t * off)
 523 {
 524         return -EINVAL;
 525 }
 526
 527 #endif                          /* CONFIG_PPC_PSERIES */
 528
 529 static int lparcfg_data(struct seq_file *m, void *v)
 530 {
 531         struct device_node *rootdn;
 532         const char *model = "";
 533         const char *system_id = "";
 534         const char *tmp;
 535         const unsigned int *lp_index_ptr;
 536         unsigned int lp_index = 0;
 537
 538         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 539
 540         rootdn = of_find_node_by_path("/");
 541         if (rootdn) {
 542                 tmp = of_get_property(rootdn, "model", NULL);
 543                 if (tmp) {
 544                         model = tmp;
 545                         /* Skip "IBM," - see platforms/iseries/dt.c */
 546                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 547                                 model += 4;
 548                 }
 549                 tmp = of_get_property(rootdn, "system-id", NULL);
 550                 if (tmp) {
 551                         system_id = tmp;
 552                         /* Skip "IBM," - see platforms/iseries/dt.c */
 553                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 554                                 system_id += 4;
 555                 }
 556                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 557                                         NULL);
 558                 if (lp_index_ptr)
 559                         lp_index = *lp_index_ptr;
 560                 of_node_put(rootdn);
 561         }
 562         seq_printf(m, "serial_number=%s\n", system_id);
 563         seq_printf(m, "system_type=%s\n", model);
 564         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 565
 566         if (firmware_has_feature(FW_FEATURE_ISERIES))
 567                 return iseries_lparcfg_data(m, v);
 568         return pseries_lparcfg_data(m, v);
 569 }
 570
 571 static int lparcfg_open(struct inode *inode, struct file *file)
 572 {
 573         return single_open(file, lparcfg_data, NULL);
 574 }
 575
 576 static const struct file_operations lparcfg_fops = {
 577         .owner          = THIS_MODULE,
 578         .read           = seq_read,
 579         .write          = lparcfg_write,
 580         .open           = lparcfg_open,
 581         .release        = single_release,
 582 };
 583
 584 static int __init lparcfg_init(void)
 585 {
 586         struct proc_dir_entry *ent;
 587         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 588
 589         /* Allow writing if we have FW_FEATURE_SPLPAR */
 590         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
 591                         !firmware_has_feature(FW_FEATURE_ISERIES))
 592                 mode |= S_IWUSR;
 593
 594         ent = proc_create("ppc64/lparcfg", mode, NULL, &lparcfg_fops);
 595         if (!ent) {
 596                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
 597                 return -EIO;
 598         }
 599
 600         proc_ppc64_lparcfg = ent;
 601         return 0;
 602 }
 603
 604 static void __exit lparcfg_cleanup(void)
 605 {
 606         if (proc_ppc64_lparcfg)
 607                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 608 }
 609
 610 module_init(lparcfg_init);
 611 module_exit(lparcfg_cleanup);
 612 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 613 MODULE_AUTHOR("Dave Engebretsen");
 614 MODULE_LICENSE("GPL");