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/config.h>
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/errno.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/init.h>
  27 #include <linux/seq_file.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/iseries/it_exp_vpd_panel.h>
  37 #include <asm/prom.h>
  38 #include <asm/vdso_datapage.h>
  39
  40 #define MODULE_VERS "1.6"
  41 #define MODULE_NAME "lparcfg"
  42
  43 /* #define LPARCFG_DEBUG */
  44
  45 static struct proc_dir_entry *proc_ppc64_lparcfg;
  46 #define LPARCFG_BUFF_SIZE 4096
  47
  48 #ifdef CONFIG_PPC_ISERIES
  49
  50 /*
  51  * For iSeries legacy systems, the PPA purr function is available from the
  52  * emulated_time_base field in the paca.
  53  */
  54 static unsigned long get_purr(void)
  55 {
  56         unsigned long sum_purr = 0;
  57         int cpu;
  58
  59         for_each_cpu(cpu) {
  60                 sum_purr += lppaca[cpu].emulated_time_base;
  61
  62 #ifdef PURR_DEBUG
  63                 printk(KERN_INFO "get_purr for cpu (%d) has value (%ld) \n",
  64                         cpu, lppaca[cpu].emulated_time_base);
  65 #endif
  66         }
  67         return sum_purr;
  68 }
  69
  70 #define lparcfg_write NULL
  71
  72 /*
  73  * Methods used to fetch LPAR data when running on an iSeries platform.
  74  */
  75 static int lparcfg_data(struct seq_file *m, void *v)
  76 {
  77         unsigned long pool_id, lp_index;
  78         int shared, entitled_capacity, max_entitled_capacity;
  79         int processors, max_processors;
  80         unsigned long purr = get_purr();
  81
  82         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
  83
  84         shared = (int)(get_lppaca()->shared_proc);
  85         seq_printf(m, "serial_number=%c%c%c%c%c%c%c\n",
  86                    e2a(xItExtVpdPanel.mfgID[2]),
  87                    e2a(xItExtVpdPanel.mfgID[3]),
  88                    e2a(xItExtVpdPanel.systemSerial[1]),
  89                    e2a(xItExtVpdPanel.systemSerial[2]),
  90                    e2a(xItExtVpdPanel.systemSerial[3]),
  91                    e2a(xItExtVpdPanel.systemSerial[4]),
  92                    e2a(xItExtVpdPanel.systemSerial[5]));
  93
  94         seq_printf(m, "system_type=%c%c%c%c\n",
  95                    e2a(xItExtVpdPanel.machineType[0]),
  96                    e2a(xItExtVpdPanel.machineType[1]),
  97                    e2a(xItExtVpdPanel.machineType[2]),
  98                    e2a(xItExtVpdPanel.machineType[3]));
  99
 100         lp_index = HvLpConfig_getLpIndex();
 101         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 102
 103         seq_printf(m, "system_active_processors=%d\n",
 104                    (int)HvLpConfig_getSystemPhysicalProcessors());
 105
 106         seq_printf(m, "system_potential_processors=%d\n",
 107                    (int)HvLpConfig_getSystemPhysicalProcessors());
 108
 109         processors = (int)HvLpConfig_getPhysicalProcessors();
 110         seq_printf(m, "partition_active_processors=%d\n", processors);
 111
 112         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
 113         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
 114
 115         if (shared) {
 116                 entitled_capacity = HvLpConfig_getSharedProcUnits();
 117                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
 118         } else {
 119                 entitled_capacity = processors * 100;
 120                 max_entitled_capacity = max_processors * 100;
 121         }
 122         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
 123
 124         seq_printf(m, "partition_max_entitled_capacity=%d\n",
 125                    max_entitled_capacity);
 126
 127         if (shared) {
 128                 pool_id = HvLpConfig_getSharedPoolIndex();
 129                 seq_printf(m, "pool=%d\n", (int)pool_id);
 130                 seq_printf(m, "pool_capacity=%d\n",
 131                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
 132                                  100));
 133                 seq_printf(m, "purr=%ld\n", purr);
 134         }
 135
 136         seq_printf(m, "shared_processor_mode=%d\n", shared);
 137
 138         return 0;
 139 }
 140 #endif                          /* CONFIG_PPC_ISERIES */
 141
 142 #ifdef CONFIG_PPC_PSERIES
 143 /*
 144  * Methods used to fetch LPAR data when running on a pSeries platform.
 145  */
 146 /* find a better place for this function... */
 147 static void log_plpar_hcall_return(unsigned long rc, char *tag)
 148 {
 149         if (rc == 0)            /* success, return */
 150                 return;
 151 /* check for null tag ? */
 152         if (rc == H_Hardware)
 153                 printk(KERN_INFO
 154                        "plpar-hcall (%s) failed with hardware fault\n", tag);
 155         else if (rc == H_Function)
 156                 printk(KERN_INFO
 157                        "plpar-hcall (%s) failed; function not allowed\n", tag);
 158         else if (rc == H_Authority)
 159                 printk(KERN_INFO
 160                        "plpar-hcall (%s) failed; not authorized to this function\n",
 161                        tag);
 162         else if (rc == H_Parameter)
 163                 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
 164                        tag);
 165         else
 166                 printk(KERN_INFO
 167                        "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
 168                        tag, rc);
 169
 170 }
 171
 172 /*
 173  * H_GET_PPP hcall returns info in 4 parms.
 174  *  entitled_capacity,unallocated_capacity,
 175  *  aggregation, resource_capability).
 176  *
 177  *  R4 = Entitled Processor Capacity Percentage.
 178  *  R5 = Unallocated Processor Capacity Percentage.
 179  *  R6 (AABBCCDDEEFFGGHH).
 180  *      XXXX - reserved (0)
 181  *          XXXX - reserved (0)
 182  *              XXXX - Group Number
 183  *                  XXXX - Pool Number.
 184  *  R7 (IIJJKKLLMMNNOOPP).
 185  *      XX - reserved. (0)
 186  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 187  *          XX - variable processor Capacity Weight
 188  *            XX - Unallocated Variable Processor Capacity Weight.
 189  *              XXXX - Active processors in Physical Processor Pool.
 190  *                  XXXX  - Processors active on platform.
 191  */
 192 static unsigned int h_get_ppp(unsigned long *entitled,
 193                               unsigned long *unallocated,
 194                               unsigned long *aggregation,
 195                               unsigned long *resource)
 196 {
 197         unsigned long rc;
 198         rc = plpar_hcall_4out(H_GET_PPP, 0, 0, 0, 0, entitled, unallocated,
 199                               aggregation, resource);
 200
 201         log_plpar_hcall_return(rc, "H_GET_PPP");
 202
 203         return rc;
 204 }
 205
 206 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
 207 {
 208         unsigned long rc;
 209         unsigned long dummy;
 210         rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
 211
 212         if (rc != H_Authority)
 213                 log_plpar_hcall_return(rc, "H_PIC");
 214 }
 215
 216 /* Track sum of all purrs across all processors. This is used to further */
 217 /* calculate usage values by different applications                       */
 218
 219 static unsigned long get_purr(void)
 220 {
 221         unsigned long sum_purr = 0;
 222         int cpu;
 223         struct cpu_usage *cu;
 224
 225         for_each_cpu(cpu) {
 226                 cu = &per_cpu(cpu_usage_array, cpu);
 227                 sum_purr += cu->current_tb;
 228         }
 229         return sum_purr;
 230 }
 231
 232 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 233 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 234
 235 /*
 236  * parse_system_parameter_string()
 237  * Retrieve the potential_processors, max_entitled_capacity and friends
 238  * through the get-system-parameter rtas call.  Replace keyword strings as
 239  * necessary.
 240  */
 241 static void parse_system_parameter_string(struct seq_file *m)
 242 {
 243         int call_status;
 244
 245         char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 246         if (!local_buffer) {
 247                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 248                        __FILE__, __FUNCTION__, __LINE__);
 249                 return;
 250         }
 251
 252         spin_lock(&rtas_data_buf_lock);
 253         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 254         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 255                                 NULL,
 256                                 SPLPAR_CHARACTERISTICS_TOKEN,
 257                                 __pa(rtas_data_buf));
 258         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 259         spin_unlock(&rtas_data_buf_lock);
 260
 261         if (call_status != 0) {
 262                 printk(KERN_INFO
 263                        "%s %s Error calling get-system-parameter (0x%x)\n",
 264                        __FILE__, __FUNCTION__, call_status);
 265         } else {
 266                 int splpar_strlen;
 267                 int idx, w_idx;
 268                 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 269                 if (!workbuffer) {
 270                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 271                                __FILE__, __FUNCTION__, __LINE__);
 272                         kfree(local_buffer);
 273                         return;
 274                 }
 275 #ifdef LPARCFG_DEBUG
 276                 printk(KERN_INFO "success calling get-system-parameter \n");
 277 #endif
 278                 splpar_strlen = local_buffer[0] * 16 + local_buffer[1];
 279                 local_buffer += 2;      /* step over strlen value */
 280
 281                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 282                 w_idx = 0;
 283                 idx = 0;
 284                 while ((*local_buffer) && (idx < splpar_strlen)) {
 285                         workbuffer[w_idx++] = local_buffer[idx++];
 286                         if ((local_buffer[idx] == ',')
 287                             || (local_buffer[idx] == '\0')) {
 288                                 workbuffer[w_idx] = '\0';
 289                                 if (w_idx) {
 290                                         /* avoid the empty string */
 291                                         seq_printf(m, "%s\n", workbuffer);
 292                                 }
 293                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 294                                 idx++;  /* skip the comma */
 295                                 w_idx = 0;
 296                         } else if (local_buffer[idx] == '=') {
 297                                 /* code here to replace workbuffer contents
 298                                    with different keyword strings */
 299                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 300                                         strcpy(workbuffer,
 301                                                "partition_max_entitled_capacity");
 302                                         w_idx = strlen(workbuffer);
 303                                 }
 304                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 305                                         strcpy(workbuffer,
 306                                                "system_potential_processors");
 307                                         w_idx = strlen(workbuffer);
 308                                 }
 309                         }
 310                 }
 311                 kfree(workbuffer);
 312                 local_buffer -= 2;      /* back up over strlen value */
 313         }
 314         kfree(local_buffer);
 315 }
 316
 317 /* Return the number of processors in the system.
 318  * This function reads through the device tree and counts
 319  * the virtual processors, this does not include threads.
 320  */
 321 static int lparcfg_count_active_processors(void)
 322 {
 323         struct device_node *cpus_dn = NULL;
 324         int count = 0;
 325
 326         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 327 #ifdef LPARCFG_DEBUG
 328                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
 329 #endif
 330                 count++;
 331         }
 332         return count;
 333 }
 334
 335 static int lparcfg_data(struct seq_file *m, void *v)
 336 {
 337         int partition_potential_processors;
 338         int partition_active_processors;
 339         struct device_node *rootdn;
 340         const char *model = "";
 341         const char *system_id = "";
 342         unsigned int *lp_index_ptr, lp_index = 0;
 343         struct device_node *rtas_node;
 344         int *lrdrp = NULL;
 345
 346         rootdn = find_path_device("/");
 347         if (rootdn) {
 348                 model = get_property(rootdn, "model", NULL);
 349                 system_id = get_property(rootdn, "system-id", NULL);
 350                 lp_index_ptr = (unsigned int *)
 351                     get_property(rootdn, "ibm,partition-no", NULL);
 352                 if (lp_index_ptr)
 353                         lp_index = *lp_index_ptr;
 354         }
 355
 356         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 357
 358         seq_printf(m, "serial_number=%s\n", system_id);
 359
 360         seq_printf(m, "system_type=%s\n", model);
 361
 362         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 363
 364         rtas_node = find_path_device("/rtas");
 365         if (rtas_node)
 366                 lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity",
 367                                             NULL);
 368
 369         if (lrdrp == NULL) {
 370                 partition_potential_processors = vdso_data->processorCount;
 371         } else {
 372                 partition_potential_processors = *(lrdrp + 4);
 373         }
 374
 375         partition_active_processors = lparcfg_count_active_processors();
 376
 377         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 378                 unsigned long h_entitled, h_unallocated;
 379                 unsigned long h_aggregation, h_resource;
 380                 unsigned long pool_idle_time, pool_procs;
 381                 unsigned long purr;
 382
 383                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
 384                           &h_resource);
 385
 386                 seq_printf(m, "R4=0x%lx\n", h_entitled);
 387                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
 388                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
 389                 seq_printf(m, "R7=0x%lx\n", h_resource);
 390
 391                 purr = get_purr();
 392
 393                 /* this call handles the ibm,get-system-parameter contents */
 394                 parse_system_parameter_string(m);
 395
 396                 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
 397
 398                 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
 399
 400                 seq_printf(m, "system_active_processors=%ld\n",
 401                            (h_resource >> 0 * 8) & 0xffff);
 402
 403                 /* pool related entries are apropriate for shared configs */
 404                 if (lppaca[0].shared_proc) {
 405
 406                         h_pic(&pool_idle_time, &pool_procs);
 407
 408                         seq_printf(m, "pool=%ld\n",
 409                                    (h_aggregation >> 0 * 8) & 0xffff);
 410
 411                         /* report pool_capacity in percentage */
 412                         seq_printf(m, "pool_capacity=%ld\n",
 413                                    ((h_resource >> 2 * 8) & 0xffff) * 100);
 414
 415                         seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 416
 417                         seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 418                 }
 419
 420                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
 421                            (h_resource >> 4 * 8) & 0xFF);
 422
 423                 seq_printf(m, "capacity_weight=%ld\n",
 424                            (h_resource >> 5 * 8) & 0xFF);
 425
 426                 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
 427
 428                 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
 429
 430                 seq_printf(m, "purr=%ld\n", purr);
 431
 432         } else {                /* non SPLPAR case */
 433
 434                 seq_printf(m, "system_active_processors=%d\n",
 435                            partition_potential_processors);
 436
 437                 seq_printf(m, "system_potential_processors=%d\n",
 438                            partition_potential_processors);
 439
 440                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 441                            partition_potential_processors * 100);
 442
 443                 seq_printf(m, "partition_entitled_capacity=%d\n",
 444                            partition_active_processors * 100);
 445         }
 446
 447         seq_printf(m, "partition_active_processors=%d\n",
 448                    partition_active_processors);
 449
 450         seq_printf(m, "partition_potential_processors=%d\n",
 451                    partition_potential_processors);
 452
 453         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 454
 455         return 0;
 456 }
 457
 458 /*
 459  * Interface for changing system parameters (variable capacity weight
 460  * and entitled capacity).  Format of input is "param_name=value";
 461  * anything after value is ignored.  Valid parameters at this time are
 462  * "partition_entitled_capacity" and "capacity_weight".  We use
 463  * H_SET_PPP to alter parameters.
 464  *
 465  * This function should be invoked only on systems with
 466  * FW_FEATURE_SPLPAR.
 467  */
 468 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 469                              size_t count, loff_t * off)
 470 {
 471         char *kbuf;
 472         char *tmp;
 473         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 474         u8 new_weight, *new_weight_ptr = &new_weight;
 475
 476         unsigned long current_entitled; /* parameters for h_get_ppp */
 477         unsigned long dummy;
 478         unsigned long resource;
 479         u8 current_weight;
 480
 481         ssize_t retval = -ENOMEM;
 482
 483         kbuf = kmalloc(count, GFP_KERNEL);
 484         if (!kbuf)
 485                 goto out;
 486
 487         retval = -EFAULT;
 488         if (copy_from_user(kbuf, buf, count))
 489                 goto out;
 490
 491         retval = -EINVAL;
 492         kbuf[count - 1] = '\0';
 493         tmp = strchr(kbuf, '=');
 494         if (!tmp)
 495                 goto out;
 496
 497         *tmp++ = '\0';
 498
 499         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 500                 char *endp;
 501                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 502                 if (endp == tmp)
 503                         goto out;
 504                 new_weight_ptr = &current_weight;
 505         } else if (!strcmp(kbuf, "capacity_weight")) {
 506                 char *endp;
 507                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 508                 if (endp == tmp)
 509                         goto out;
 510                 new_entitled_ptr = &current_entitled;
 511         } else
 512                 goto out;
 513
 514         /* Get our current parameters */
 515         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
 516         if (retval) {
 517                 retval = -EIO;
 518                 goto out;
 519         }
 520
 521         current_weight = (resource >> 5 * 8) & 0xFF;
 522
 523         pr_debug("%s: current_entitled = %lu, current_weight = %lu\n",
 524                  __FUNCTION__, current_entitled, current_weight);
 525
 526         pr_debug("%s: new_entitled = %lu, new_weight = %lu\n",
 527                  __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
 528
 529         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
 530                                     *new_weight_ptr);
 531
 532         if (retval == H_Success || retval == H_Constrained) {
 533                 retval = count;
 534         } else if (retval == H_Busy) {
 535                 retval = -EBUSY;
 536         } else if (retval == H_Hardware) {
 537                 retval = -EIO;
 538         } else if (retval == H_Parameter) {
 539                 retval = -EINVAL;
 540         } else {
 541                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
 542                        __FUNCTION__, retval);
 543                 retval = -EIO;
 544         }
 545
 546 out:
 547         kfree(kbuf);
 548         return retval;
 549 }
 550
 551 #endif                          /* CONFIG_PPC_PSERIES */
 552
 553 static int lparcfg_open(struct inode *inode, struct file *file)
 554 {
 555         return single_open(file, lparcfg_data, NULL);
 556 }
 557
 558 struct file_operations lparcfg_fops = {
 559         .owner          = THIS_MODULE,
 560         .read           = seq_read,
 561         .open           = lparcfg_open,
 562         .release        = single_release,
 563 };
 564
 565 int __init lparcfg_init(void)
 566 {
 567         struct proc_dir_entry *ent;
 568         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 569
 570         /* Allow writing if we have FW_FEATURE_SPLPAR */
 571         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 572                 lparcfg_fops.write = lparcfg_write;
 573                 mode |= S_IWUSR;
 574         }
 575
 576         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
 577         if (ent) {
 578                 ent->proc_fops = &lparcfg_fops;
 579                 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
 580                 if (!ent->data) {
 581                         printk(KERN_ERR
 582                                "Failed to allocate buffer for lparcfg\n");
 583                         remove_proc_entry("lparcfg", ent->parent);
 584                         return -ENOMEM;
 585                 }
 586         } else {
 587                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
 588                 return -EIO;
 589         }
 590
 591         proc_ppc64_lparcfg = ent;
 592         return 0;
 593 }
 594
 595 void __exit lparcfg_cleanup(void)
 596 {
 597         if (proc_ppc64_lparcfg) {
 598                 kfree(proc_ppc64_lparcfg->data);
 599                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 600         }
 601 }
 602
 603 module_init(lparcfg_init);
 604 module_exit(lparcfg_cleanup);
 605 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 606 MODULE_AUTHOR("Dave Engebretsen");
 607 MODULE_LICENSE("GPL");