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