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/iseries/it_exp_vpd_panel.h>
  36 #include <asm/prom.h>
  37 #include <asm/vdso_datapage.h>
  38
  39 #define MODULE_VERS "1.7"
  40 #define MODULE_NAME "lparcfg"
  41
  42 /* #define LPARCFG_DEBUG */
  43
  44 static struct proc_dir_entry *proc_ppc64_lparcfg;
  45 #define LPARCFG_BUFF_SIZE 4096
  46
  47 /*
  48  * Track sum of all purrs across all processors. This is used to further
  49  * calculate usage values by different applications
  50  */
  51 static unsigned long get_purr(void)
  52 {
  53         unsigned long sum_purr = 0;
  54         int cpu;
  55
  56         for_each_possible_cpu(cpu) {
  57                 if (firmware_has_feature(FW_FEATURE_ISERIES))
  58                         sum_purr += lppaca[cpu].emulated_time_base;
  59                 else {
  60                         struct cpu_usage *cu;
  61
  62                         cu = &per_cpu(cpu_usage_array, cpu);
  63                         sum_purr += cu->current_tb;
  64                 }
  65         }
  66         return sum_purr;
  67 }
  68
  69 #ifdef CONFIG_PPC_ISERIES
  70
  71 /*
  72  * Methods used to fetch LPAR data when running on an iSeries platform.
  73  */
  74 static int iseries_lparcfg_data(struct seq_file *m, void *v)
  75 {
  76         unsigned long pool_id;
  77         int shared, entitled_capacity, max_entitled_capacity;
  78         int processors, max_processors;
  79         unsigned long purr = get_purr();
  80
  81         shared = (int)(get_lppaca()->shared_proc);
  82
  83         seq_printf(m, "system_active_processors=%d\n",
  84                    (int)HvLpConfig_getSystemPhysicalProcessors());
  85
  86         seq_printf(m, "system_potential_processors=%d\n",
  87                    (int)HvLpConfig_getSystemPhysicalProcessors());
  88
  89         processors = (int)HvLpConfig_getPhysicalProcessors();
  90         seq_printf(m, "partition_active_processors=%d\n", processors);
  91
  92         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
  93         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
  94
  95         if (shared) {
  96                 entitled_capacity = HvLpConfig_getSharedProcUnits();
  97                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
  98         } else {
  99                 entitled_capacity = processors * 100;
 100                 max_entitled_capacity = max_processors * 100;
 101         }
 102         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
 103
 104         seq_printf(m, "partition_max_entitled_capacity=%d\n",
 105                    max_entitled_capacity);
 106
 107         if (shared) {
 108                 pool_id = HvLpConfig_getSharedPoolIndex();
 109                 seq_printf(m, "pool=%d\n", (int)pool_id);
 110                 seq_printf(m, "pool_capacity=%d\n",
 111                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
 112                                  100));
 113                 seq_printf(m, "purr=%ld\n", purr);
 114         }
 115
 116         seq_printf(m, "shared_processor_mode=%d\n", shared);
 117
 118         return 0;
 119 }
 120
 121 #else                           /* CONFIG_PPC_ISERIES */
 122
 123 static int iseries_lparcfg_data(struct seq_file *m, void *v)
 124 {
 125         return 0;
 126 }
 127
 128 #endif                          /* CONFIG_PPC_ISERIES */
 129
 130 #ifdef CONFIG_PPC_PSERIES
 131 /*
 132  * Methods used to fetch LPAR data when running on a pSeries platform.
 133  */
 134 /* find a better place for this function... */
 135 static void log_plpar_hcall_return(unsigned long rc, char *tag)
 136 {
 137         if (rc == 0)            /* success, return */
 138                 return;
 139 /* check for null tag ? */
 140         if (rc == H_HARDWARE)
 141                 printk(KERN_INFO
 142                        "plpar-hcall (%s) failed with hardware fault\n", tag);
 143         else if (rc == H_FUNCTION)
 144                 printk(KERN_INFO
 145                        "plpar-hcall (%s) failed; function not allowed\n", tag);
 146         else if (rc == H_AUTHORITY)
 147                 printk(KERN_INFO
 148                        "plpar-hcall (%s) failed; not authorized to this"
 149                        " function\n", tag);
 150         else if (rc == H_PARAMETER)
 151                 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
 152                        tag);
 153         else
 154                 printk(KERN_INFO
 155                        "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
 156                        tag, rc);
 157
 158 }
 159
 160 /*
 161  * H_GET_PPP hcall returns info in 4 parms.
 162  *  entitled_capacity,unallocated_capacity,
 163  *  aggregation, resource_capability).
 164  *
 165  *  R4 = Entitled Processor Capacity Percentage.
 166  *  R5 = Unallocated Processor Capacity Percentage.
 167  *  R6 (AABBCCDDEEFFGGHH).
 168  *      XXXX - reserved (0)
 169  *          XXXX - reserved (0)
 170  *              XXXX - Group Number
 171  *                  XXXX - Pool Number.
 172  *  R7 (IIJJKKLLMMNNOOPP).
 173  *      XX - reserved. (0)
 174  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 175  *          XX - variable processor Capacity Weight
 176  *            XX - Unallocated Variable Processor Capacity Weight.
 177  *              XXXX - Active processors in Physical Processor Pool.
 178  *                  XXXX  - Processors active on platform.
 179  */
 180 static unsigned int h_get_ppp(unsigned long *entitled,
 181                               unsigned long *unallocated,
 182                               unsigned long *aggregation,
 183                               unsigned long *resource)
 184 {
 185         unsigned long rc;
 186         rc = plpar_hcall_4out(H_GET_PPP, 0, 0, 0, 0, entitled, unallocated,
 187                               aggregation, resource);
 188
 189         log_plpar_hcall_return(rc, "H_GET_PPP");
 190
 191         return rc;
 192 }
 193
 194 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
 195 {
 196         unsigned long rc;
 197         unsigned long dummy;
 198         rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
 199
 200         if (rc != H_AUTHORITY)
 201                 log_plpar_hcall_return(rc, "H_PIC");
 202 }
 203
 204 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 205 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 206
 207 /*
 208  * parse_system_parameter_string()
 209  * Retrieve the potential_processors, max_entitled_capacity and friends
 210  * through the get-system-parameter rtas call.  Replace keyword strings as
 211  * necessary.
 212  */
 213 static void parse_system_parameter_string(struct seq_file *m)
 214 {
 215         int call_status;
 216
 217         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 218         if (!local_buffer) {
 219                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 220                        __FILE__, __FUNCTION__, __LINE__);
 221                 return;
 222         }
 223
 224         spin_lock(&rtas_data_buf_lock);
 225         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 226         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 227                                 NULL,
 228                                 SPLPAR_CHARACTERISTICS_TOKEN,
 229                                 __pa(rtas_data_buf),
 230                                 RTAS_DATA_BUF_SIZE);
 231         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 232         spin_unlock(&rtas_data_buf_lock);
 233
 234         if (call_status != 0) {
 235                 printk(KERN_INFO
 236                        "%s %s Error calling get-system-parameter (0x%x)\n",
 237                        __FILE__, __FUNCTION__, call_status);
 238         } else {
 239                 int splpar_strlen;
 240                 int idx, w_idx;
 241                 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 242                 if (!workbuffer) {
 243                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 244                                __FILE__, __FUNCTION__, __LINE__);
 245                         kfree(local_buffer);
 246                         return;
 247                 }
 248 #ifdef LPARCFG_DEBUG
 249                 printk(KERN_INFO "success calling get-system-parameter \n");
 250 #endif
 251                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 252                 local_buffer += 2;      /* step over strlen value */
 253
 254                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 255                 w_idx = 0;
 256                 idx = 0;
 257                 while ((*local_buffer) && (idx < splpar_strlen)) {
 258                         workbuffer[w_idx++] = local_buffer[idx++];
 259                         if ((local_buffer[idx] == ',')
 260                             || (local_buffer[idx] == '\0')) {
 261                                 workbuffer[w_idx] = '\0';
 262                                 if (w_idx) {
 263                                         /* avoid the empty string */
 264                                         seq_printf(m, "%s\n", workbuffer);
 265                                 }
 266                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 267                                 idx++;  /* skip the comma */
 268                                 w_idx = 0;
 269                         } else if (local_buffer[idx] == '=') {
 270                                 /* code here to replace workbuffer contents
 271                                    with different keyword strings */
 272                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 273                                         strcpy(workbuffer,
 274                                                "partition_max_entitled_capacity");
 275                                         w_idx = strlen(workbuffer);
 276                                 }
 277                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 278                                         strcpy(workbuffer,
 279                                                "system_potential_processors");
 280                                         w_idx = strlen(workbuffer);
 281                                 }
 282                         }
 283                 }
 284                 kfree(workbuffer);
 285                 local_buffer -= 2;      /* back up over strlen value */
 286         }
 287         kfree(local_buffer);
 288 }
 289
 290 /* Return the number of processors in the system.
 291  * This function reads through the device tree and counts
 292  * the virtual processors, this does not include threads.
 293  */
 294 static int lparcfg_count_active_processors(void)
 295 {
 296         struct device_node *cpus_dn = NULL;
 297         int count = 0;
 298
 299         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 300 #ifdef LPARCFG_DEBUG
 301                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
 302 #endif
 303                 count++;
 304         }
 305         return count;
 306 }
 307
 308 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 309 {
 310         int partition_potential_processors;
 311         int partition_active_processors;
 312         struct device_node *rtas_node;
 313         int *lrdrp = NULL;
 314
 315         rtas_node = find_path_device("/rtas");
 316         if (rtas_node)
 317                 lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity",
 318                                             NULL);
 319
 320         if (lrdrp == NULL) {
 321                 partition_potential_processors = vdso_data->processorCount;
 322         } else {
 323                 partition_potential_processors = *(lrdrp + 4);
 324         }
 325
 326         partition_active_processors = lparcfg_count_active_processors();
 327
 328         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 329                 unsigned long h_entitled, h_unallocated;
 330                 unsigned long h_aggregation, h_resource;
 331                 unsigned long pool_idle_time, pool_procs;
 332                 unsigned long purr;
 333
 334                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
 335                           &h_resource);
 336
 337                 seq_printf(m, "R4=0x%lx\n", h_entitled);
 338                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
 339                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
 340                 seq_printf(m, "R7=0x%lx\n", h_resource);
 341
 342                 purr = get_purr();
 343
 344                 /* this call handles the ibm,get-system-parameter contents */
 345                 parse_system_parameter_string(m);
 346
 347                 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
 348
 349                 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
 350
 351                 seq_printf(m, "system_active_processors=%ld\n",
 352                            (h_resource >> 0 * 8) & 0xffff);
 353
 354                 /* pool related entries are apropriate for shared configs */
 355                 if (lppaca[0].shared_proc) {
 356
 357                         h_pic(&pool_idle_time, &pool_procs);
 358
 359                         seq_printf(m, "pool=%ld\n",
 360                                    (h_aggregation >> 0 * 8) & 0xffff);
 361
 362                         /* report pool_capacity in percentage */
 363                         seq_printf(m, "pool_capacity=%ld\n",
 364                                    ((h_resource >> 2 * 8) & 0xffff) * 100);
 365
 366                         seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 367
 368                         seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 369                 }
 370
 371                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
 372                            (h_resource >> 4 * 8) & 0xFF);
 373
 374                 seq_printf(m, "capacity_weight=%ld\n",
 375                            (h_resource >> 5 * 8) & 0xFF);
 376
 377                 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
 378
 379                 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
 380
 381                 seq_printf(m, "purr=%ld\n", purr);
 382
 383         } else {                /* non SPLPAR case */
 384
 385                 seq_printf(m, "system_active_processors=%d\n",
 386                            partition_potential_processors);
 387
 388                 seq_printf(m, "system_potential_processors=%d\n",
 389                            partition_potential_processors);
 390
 391                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 392                            partition_potential_processors * 100);
 393
 394                 seq_printf(m, "partition_entitled_capacity=%d\n",
 395                            partition_active_processors * 100);
 396         }
 397
 398         seq_printf(m, "partition_active_processors=%d\n",
 399                    partition_active_processors);
 400
 401         seq_printf(m, "partition_potential_processors=%d\n",
 402                    partition_potential_processors);
 403
 404         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 405
 406         return 0;
 407 }
 408
 409 /*
 410  * Interface for changing system parameters (variable capacity weight
 411  * and entitled capacity).  Format of input is "param_name=value";
 412  * anything after value is ignored.  Valid parameters at this time are
 413  * "partition_entitled_capacity" and "capacity_weight".  We use
 414  * H_SET_PPP to alter parameters.
 415  *
 416  * This function should be invoked only on systems with
 417  * FW_FEATURE_SPLPAR.
 418  */
 419 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 420                              size_t count, loff_t * off)
 421 {
 422         char *kbuf;
 423         char *tmp;
 424         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 425         u8 new_weight, *new_weight_ptr = &new_weight;
 426
 427         unsigned long current_entitled; /* parameters for h_get_ppp */
 428         unsigned long dummy;
 429         unsigned long resource;
 430         u8 current_weight;
 431
 432         ssize_t retval = -ENOMEM;
 433
 434         kbuf = kmalloc(count, GFP_KERNEL);
 435         if (!kbuf)
 436                 goto out;
 437
 438         retval = -EFAULT;
 439         if (copy_from_user(kbuf, buf, count))
 440                 goto out;
 441
 442         retval = -EINVAL;
 443         kbuf[count - 1] = '\0';
 444         tmp = strchr(kbuf, '=');
 445         if (!tmp)
 446                 goto out;
 447
 448         *tmp++ = '\0';
 449
 450         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 451                 char *endp;
 452                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 453                 if (endp == tmp)
 454                         goto out;
 455                 new_weight_ptr = &current_weight;
 456         } else if (!strcmp(kbuf, "capacity_weight")) {
 457                 char *endp;
 458                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 459                 if (endp == tmp)
 460                         goto out;
 461                 new_entitled_ptr = &current_entitled;
 462         } else
 463                 goto out;
 464
 465         /* Get our current parameters */
 466         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
 467         if (retval) {
 468                 retval = -EIO;
 469                 goto out;
 470         }
 471
 472         current_weight = (resource >> 5 * 8) & 0xFF;
 473
 474         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 475                  __FUNCTION__, current_entitled, current_weight);
 476
 477         pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
 478                  __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
 479
 480         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
 481                                     *new_weight_ptr);
 482
 483         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 484                 retval = count;
 485         } else if (retval == H_BUSY) {
 486                 retval = -EBUSY;
 487         } else if (retval == H_HARDWARE) {
 488                 retval = -EIO;
 489         } else if (retval == H_PARAMETER) {
 490                 retval = -EINVAL;
 491         } else {
 492                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
 493                        __FUNCTION__, retval);
 494                 retval = -EIO;
 495         }
 496
 497 out:
 498         kfree(kbuf);
 499         return retval;
 500 }
 501
 502 #else                           /* CONFIG_PPC_PSERIES */
 503
 504 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 505 {
 506         return 0;
 507 }
 508
 509 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 510                              size_t count, loff_t * off)
 511 {
 512         return count;
 513 }
 514
 515 #endif                          /* CONFIG_PPC_PSERIES */
 516
 517 static int lparcfg_data(struct seq_file *m, void *v)
 518 {
 519         struct device_node *rootdn;
 520         const char *model = "";
 521         const char *system_id = "";
 522         const char *tmp;
 523         unsigned int *lp_index_ptr, lp_index = 0;
 524
 525         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 526
 527         rootdn = find_path_device("/");
 528         if (rootdn) {
 529                 tmp = get_property(rootdn, "model", NULL);
 530                 if (tmp) {
 531                         model = tmp;
 532                         /* Skip "IBM," - see platforms/iseries/dt.c */
 533                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 534                                 model += 4;
 535                 }
 536                 tmp = get_property(rootdn, "system-id", NULL);
 537                 if (tmp) {
 538                         system_id = tmp;
 539                         /* Skip "IBM," - see platforms/iseries/dt.c */
 540                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 541                                 system_id += 4;
 542                 }
 543                 lp_index_ptr = (unsigned int *)
 544                         get_property(rootdn, "ibm,partition-no", NULL);
 545                 if (lp_index_ptr)
 546                         lp_index = *lp_index_ptr;
 547         }
 548         seq_printf(m, "serial_number=%s\n", system_id);
 549         seq_printf(m, "system_type=%s\n", model);
 550         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 551
 552         if (firmware_has_feature(FW_FEATURE_ISERIES))
 553                 return iseries_lparcfg_data(m, v);
 554         return pseries_lparcfg_data(m, v);
 555 }
 556
 557 static int lparcfg_open(struct inode *inode, struct file *file)
 558 {
 559         return single_open(file, lparcfg_data, NULL);
 560 }
 561
 562 struct file_operations lparcfg_fops = {
 563         .owner          = THIS_MODULE,
 564         .read           = seq_read,
 565         .open           = lparcfg_open,
 566         .release        = single_release,
 567 };
 568
 569 int __init lparcfg_init(void)
 570 {
 571         struct proc_dir_entry *ent;
 572         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 573
 574         /* Allow writing if we have FW_FEATURE_SPLPAR */
 575         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
 576                         !firmware_has_feature(FW_FEATURE_ISERIES)) {
 577                 lparcfg_fops.write = lparcfg_write;
 578                 mode |= S_IWUSR;
 579         }
 580
 581         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
 582         if (ent) {
 583                 ent->proc_fops = &lparcfg_fops;
 584                 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
 585                 if (!ent->data) {
 586                         printk(KERN_ERR
 587                                "Failed to allocate buffer for lparcfg\n");
 588                         remove_proc_entry("lparcfg", ent->parent);
 589                         return -ENOMEM;
 590                 }
 591         } else {
 592                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
 593                 return -EIO;
 594         }
 595
 596         proc_ppc64_lparcfg = ent;
 597         return 0;
 598 }
 599
 600 void __exit lparcfg_cleanup(void)
 601 {
 602         if (proc_ppc64_lparcfg) {
 603                 kfree(proc_ppc64_lparcfg->data);
 604                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 605         }
 606 }
 607
 608 module_init(lparcfg_init);
 609 module_exit(lparcfg_cleanup);
 610 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 611 MODULE_AUTHOR("Dave Engebretsen");
 612 MODULE_LICENSE("GPL");