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   1 /*
   2  * PowerPC64 LPAR Configuration Information Driver
   3  *
   4  * Dave Engebretsen engebret@us.ibm.com
   5  *    Copyright (c) 2003 Dave Engebretsen
   6  * Will Schmidt willschm@us.ibm.com
   7  *    SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
   8  *    seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
   9  * Nathan Lynch nathanl@austin.ibm.com
  10  *    Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  * This driver creates a proc file at /proc/ppc64/lparcfg which contains
  18  * keyword - value pairs that specify the configuration of the partition.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/errno.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/init.h>
  26 #include <linux/seq_file.h>
  27 #include <asm/uaccess.h>
  28 #include <asm/iseries/hv_lp_config.h>
  29 #include <asm/lppaca.h>
  30 #include <asm/hvcall.h>
  31 #include <asm/firmware.h>
  32 #include <asm/rtas.h>
  33 #include <asm/system.h>
  34 #include <asm/time.h>
  35 #include <asm/prom.h>
  36 #include <asm/vdso_datapage.h>
  37
  38 #define MODULE_VERS "1.7"
  39 #define MODULE_NAME "lparcfg"
  40
  41 /* #define LPARCFG_DEBUG */
  42
  43 static struct proc_dir_entry *proc_ppc64_lparcfg;
  44 #define LPARCFG_BUFF_SIZE 4096
  45
  46 /*
  47  * Track sum of all purrs across all processors. This is used to further
  48  * calculate usage values by different applications
  49  */
  50 static unsigned long get_purr(void)
  51 {
  52         unsigned long sum_purr = 0;
  53         int cpu;
  54
  55         for_each_possible_cpu(cpu) {
  56                 if (firmware_has_feature(FW_FEATURE_ISERIES))
  57                         sum_purr += lppaca[cpu].emulated_time_base;
  58                 else {
  59                         struct cpu_usage *cu;
  60
  61                         cu = &per_cpu(cpu_usage_array, cpu);
  62                         sum_purr += cu->current_tb;
  63                 }
  64         }
  65         return sum_purr;
  66 }
  67
  68 #ifdef CONFIG_PPC_ISERIES
  69
  70 /*
  71  * Methods used to fetch LPAR data when running on an iSeries platform.
  72  */
  73 static int iseries_lparcfg_data(struct seq_file *m, void *v)
  74 {
  75         unsigned long pool_id;
  76         int shared, entitled_capacity, max_entitled_capacity;
  77         int processors, max_processors;
  78         unsigned long purr = get_purr();
  79
  80         shared = (int)(get_lppaca()->shared_proc);
  81
  82         seq_printf(m, "system_active_processors=%d\n",
  83                    (int)HvLpConfig_getSystemPhysicalProcessors());
  84
  85         seq_printf(m, "system_potential_processors=%d\n",
  86                    (int)HvLpConfig_getSystemPhysicalProcessors());
  87
  88         processors = (int)HvLpConfig_getPhysicalProcessors();
  89         seq_printf(m, "partition_active_processors=%d\n", processors);
  90
  91         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
  92         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
  93
  94         if (shared) {
  95                 entitled_capacity = HvLpConfig_getSharedProcUnits();
  96                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
  97         } else {
  98                 entitled_capacity = processors * 100;
  99                 max_entitled_capacity = max_processors * 100;
 100         }
 101         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
 102
 103         seq_printf(m, "partition_max_entitled_capacity=%d\n",
 104                    max_entitled_capacity);
 105
 106         if (shared) {
 107                 pool_id = HvLpConfig_getSharedPoolIndex();
 108                 seq_printf(m, "pool=%d\n", (int)pool_id);
 109                 seq_printf(m, "pool_capacity=%d\n",
 110                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
 111                                  100));
 112                 seq_printf(m, "purr=%ld\n", purr);
 113         }
 114
 115         seq_printf(m, "shared_processor_mode=%d\n", shared);
 116
 117         return 0;
 118 }
 119
 120 #else                           /* CONFIG_PPC_ISERIES */
 121
 122 static int iseries_lparcfg_data(struct seq_file *m, void *v)
 123 {
 124         return 0;
 125 }
 126
 127 #endif                          /* CONFIG_PPC_ISERIES */
 128
 129 #ifdef CONFIG_PPC_PSERIES
 130 /*
 131  * Methods used to fetch LPAR data when running on a pSeries platform.
 132  */
 133 /* find a better place for this function... */
 134 static void log_plpar_hcall_return(unsigned long rc, char *tag)
 135 {
 136         if (rc == 0)            /* success, return */
 137                 return;
 138 /* check for null tag ? */
 139         if (rc == H_HARDWARE)
 140                 printk(KERN_INFO
 141                        "plpar-hcall (%s) failed with hardware fault\n", tag);
 142         else if (rc == H_FUNCTION)
 143                 printk(KERN_INFO
 144                        "plpar-hcall (%s) failed; function not allowed\n", tag);
 145         else if (rc == H_AUTHORITY)
 146                 printk(KERN_INFO
 147                        "plpar-hcall (%s) failed; not authorized to this"
 148                        " function\n", tag);
 149         else if (rc == H_PARAMETER)
 150                 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
 151                        tag);
 152         else
 153                 printk(KERN_INFO
 154                        "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
 155                        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         rc = plpar_hcall_4out(H_GET_PPP, 0, 0, 0, 0, entitled, unallocated,
 186                               aggregation, resource);
 187
 188         log_plpar_hcall_return(rc, "H_GET_PPP");
 189
 190         return rc;
 191 }
 192
 193 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
 194 {
 195         unsigned long rc;
 196         unsigned long dummy;
 197         rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
 198
 199         if (rc != H_AUTHORITY)
 200                 log_plpar_hcall_return(rc, "H_PIC");
 201 }
 202
 203 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 204 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 205
 206 /*
 207  * parse_system_parameter_string()
 208  * Retrieve the potential_processors, max_entitled_capacity and friends
 209  * through the get-system-parameter rtas call.  Replace keyword strings as
 210  * necessary.
 211  */
 212 static void parse_system_parameter_string(struct seq_file *m)
 213 {
 214         int call_status;
 215
 216         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 217         if (!local_buffer) {
 218                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 219                        __FILE__, __FUNCTION__, __LINE__);
 220                 return;
 221         }
 222
 223         spin_lock(&rtas_data_buf_lock);
 224         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 225         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 226                                 NULL,
 227                                 SPLPAR_CHARACTERISTICS_TOKEN,
 228                                 __pa(rtas_data_buf),
 229                                 RTAS_DATA_BUF_SIZE);
 230         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 231         spin_unlock(&rtas_data_buf_lock);
 232
 233         if (call_status != 0) {
 234                 printk(KERN_INFO
 235                        "%s %s Error calling get-system-parameter (0x%x)\n",
 236                        __FILE__, __FUNCTION__, call_status);
 237         } else {
 238                 int splpar_strlen;
 239                 int idx, w_idx;
 240                 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 241                 if (!workbuffer) {
 242                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 243                                __FILE__, __FUNCTION__, __LINE__);
 244                         kfree(local_buffer);
 245                         return;
 246                 }
 247 #ifdef LPARCFG_DEBUG
 248                 printk(KERN_INFO "success calling get-system-parameter \n");
 249 #endif
 250                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 251                 local_buffer += 2;      /* step over strlen value */
 252
 253                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 254                 w_idx = 0;
 255                 idx = 0;
 256                 while ((*local_buffer) && (idx < splpar_strlen)) {
 257                         workbuffer[w_idx++] = local_buffer[idx++];
 258                         if ((local_buffer[idx] == ',')
 259                             || (local_buffer[idx] == '\0')) {
 260                                 workbuffer[w_idx] = '\0';
 261                                 if (w_idx) {
 262                                         /* avoid the empty string */
 263                                         seq_printf(m, "%s\n", workbuffer);
 264                                 }
 265                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 266                                 idx++;  /* skip the comma */
 267                                 w_idx = 0;
 268                         } else if (local_buffer[idx] == '=') {
 269                                 /* code here to replace workbuffer contents
 270                                    with different keyword strings */
 271                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 272                                         strcpy(workbuffer,
 273                                                "partition_max_entitled_capacity");
 274                                         w_idx = strlen(workbuffer);
 275                                 }
 276                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 277                                         strcpy(workbuffer,
 278                                                "system_potential_processors");
 279                                         w_idx = strlen(workbuffer);
 280                                 }
 281                         }
 282                 }
 283                 kfree(workbuffer);
 284                 local_buffer -= 2;      /* back up over strlen value */
 285         }
 286         kfree(local_buffer);
 287 }
 288
 289 /* Return the number of processors in the system.
 290  * This function reads through the device tree and counts
 291  * the virtual processors, this does not include threads.
 292  */
 293 static int lparcfg_count_active_processors(void)
 294 {
 295         struct device_node *cpus_dn = NULL;
 296         int count = 0;
 297
 298         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 299 #ifdef LPARCFG_DEBUG
 300                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
 301 #endif
 302                 count++;
 303         }
 304         return count;
 305 }
 306
 307 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 308 {
 309         int partition_potential_processors;
 310         int partition_active_processors;
 311         struct device_node *rtas_node;
 312         const int *lrdrp = NULL;
 313
 314         rtas_node = find_path_device("/rtas");
 315         if (rtas_node)
 316                 lrdrp = get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 317
 318         if (lrdrp == NULL) {
 319                 partition_potential_processors = vdso_data->processorCount;
 320         } else {
 321                 partition_potential_processors = *(lrdrp + 4);
 322         }
 323
 324         partition_active_processors = lparcfg_count_active_processors();
 325
 326         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 327                 unsigned long h_entitled, h_unallocated;
 328                 unsigned long h_aggregation, h_resource;
 329                 unsigned long pool_idle_time, pool_procs;
 330                 unsigned long purr;
 331
 332                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
 333                           &h_resource);
 334
 335                 seq_printf(m, "R4=0x%lx\n", h_entitled);
 336                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
 337                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
 338                 seq_printf(m, "R7=0x%lx\n", h_resource);
 339
 340                 purr = get_purr();
 341
 342                 /* this call handles the ibm,get-system-parameter contents */
 343                 parse_system_parameter_string(m);
 344
 345                 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
 346
 347                 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
 348
 349                 seq_printf(m, "system_active_processors=%ld\n",
 350                            (h_resource >> 0 * 8) & 0xffff);
 351
 352                 /* pool related entries are apropriate for shared configs */
 353                 if (lppaca[0].shared_proc) {
 354
 355                         h_pic(&pool_idle_time, &pool_procs);
 356
 357                         seq_printf(m, "pool=%ld\n",
 358                                    (h_aggregation >> 0 * 8) & 0xffff);
 359
 360                         /* report pool_capacity in percentage */
 361                         seq_printf(m, "pool_capacity=%ld\n",
 362                                    ((h_resource >> 2 * 8) & 0xffff) * 100);
 363
 364                         seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 365
 366                         seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 367                 }
 368
 369                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
 370                            (h_resource >> 4 * 8) & 0xFF);
 371
 372                 seq_printf(m, "capacity_weight=%ld\n",
 373                            (h_resource >> 5 * 8) & 0xFF);
 374
 375                 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
 376
 377                 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
 378
 379                 seq_printf(m, "purr=%ld\n", purr);
 380
 381         } else {                /* non SPLPAR case */
 382
 383                 seq_printf(m, "system_active_processors=%d\n",
 384                            partition_potential_processors);
 385
 386                 seq_printf(m, "system_potential_processors=%d\n",
 387                            partition_potential_processors);
 388
 389                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 390                            partition_potential_processors * 100);
 391
 392                 seq_printf(m, "partition_entitled_capacity=%d\n",
 393                            partition_active_processors * 100);
 394         }
 395
 396         seq_printf(m, "partition_active_processors=%d\n",
 397                    partition_active_processors);
 398
 399         seq_printf(m, "partition_potential_processors=%d\n",
 400                    partition_potential_processors);
 401
 402         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 403
 404         return 0;
 405 }
 406
 407 /*
 408  * Interface for changing system parameters (variable capacity weight
 409  * and entitled capacity).  Format of input is "param_name=value";
 410  * anything after value is ignored.  Valid parameters at this time are
 411  * "partition_entitled_capacity" and "capacity_weight".  We use
 412  * H_SET_PPP to alter parameters.
 413  *
 414  * This function should be invoked only on systems with
 415  * FW_FEATURE_SPLPAR.
 416  */
 417 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 418                              size_t count, loff_t * off)
 419 {
 420         char *kbuf;
 421         char *tmp;
 422         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 423         u8 new_weight, *new_weight_ptr = &new_weight;
 424
 425         unsigned long current_entitled; /* parameters for h_get_ppp */
 426         unsigned long dummy;
 427         unsigned long resource;
 428         u8 current_weight;
 429
 430         ssize_t retval = -ENOMEM;
 431
 432         kbuf = kmalloc(count, GFP_KERNEL);
 433         if (!kbuf)
 434                 goto out;
 435
 436         retval = -EFAULT;
 437         if (copy_from_user(kbuf, buf, count))
 438                 goto out;
 439
 440         retval = -EINVAL;
 441         kbuf[count - 1] = '\0';
 442         tmp = strchr(kbuf, '=');
 443         if (!tmp)
 444                 goto out;
 445
 446         *tmp++ = '\0';
 447
 448         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 449                 char *endp;
 450                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 451                 if (endp == tmp)
 452                         goto out;
 453                 new_weight_ptr = &current_weight;
 454         } else if (!strcmp(kbuf, "capacity_weight")) {
 455                 char *endp;
 456                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 457                 if (endp == tmp)
 458                         goto out;
 459                 new_entitled_ptr = &current_entitled;
 460         } else
 461                 goto out;
 462
 463         /* Get our current parameters */
 464         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
 465         if (retval) {
 466                 retval = -EIO;
 467                 goto out;
 468         }
 469
 470         current_weight = (resource >> 5 * 8) & 0xFF;
 471
 472         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 473                  __FUNCTION__, current_entitled, current_weight);
 474
 475         pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
 476                  __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
 477
 478         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
 479                                     *new_weight_ptr);
 480
 481         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 482                 retval = count;
 483         } else if (retval == H_BUSY) {
 484                 retval = -EBUSY;
 485         } else if (retval == H_HARDWARE) {
 486                 retval = -EIO;
 487         } else if (retval == H_PARAMETER) {
 488                 retval = -EINVAL;
 489         } else {
 490                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
 491                        __FUNCTION__, retval);
 492                 retval = -EIO;
 493         }
 494
 495 out:
 496         kfree(kbuf);
 497         return retval;
 498 }
 499
 500 #else                           /* CONFIG_PPC_PSERIES */
 501
 502 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 503 {
 504         return 0;
 505 }
 506
 507 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 508                              size_t count, loff_t * off)
 509 {
 510         return count;
 511 }
 512
 513 #endif                          /* CONFIG_PPC_PSERIES */
 514
 515 static int lparcfg_data(struct seq_file *m, void *v)
 516 {
 517         struct device_node *rootdn;
 518         const char *model = "";
 519         const char *system_id = "";
 520         const char *tmp;
 521         const unsigned int *lp_index_ptr;
 522         unsigned int lp_index = 0;
 523
 524         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 525
 526         rootdn = find_path_device("/");
 527         if (rootdn) {
 528                 tmp = get_property(rootdn, "model", NULL);
 529                 if (tmp) {
 530                         model = tmp;
 531                         /* Skip "IBM," - see platforms/iseries/dt.c */
 532                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 533                                 model += 4;
 534                 }
 535                 tmp = get_property(rootdn, "system-id", NULL);
 536                 if (tmp) {
 537                         system_id = tmp;
 538                         /* Skip "IBM," - see platforms/iseries/dt.c */
 539                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 540                                 system_id += 4;
 541                 }
 542                 lp_index_ptr = get_property(rootdn, "ibm,partition-no", NULL);
 543                 if (lp_index_ptr)
 544                         lp_index = *lp_index_ptr;
 545         }
 546         seq_printf(m, "serial_number=%s\n", system_id);
 547         seq_printf(m, "system_type=%s\n", model);
 548         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 549
 550         if (firmware_has_feature(FW_FEATURE_ISERIES))
 551                 return iseries_lparcfg_data(m, v);
 552         return pseries_lparcfg_data(m, v);
 553 }
 554
 555 static int lparcfg_open(struct inode *inode, struct file *file)
 556 {
 557         return single_open(file, lparcfg_data, NULL);
 558 }
 559
 560 struct file_operations lparcfg_fops = {
 561         .owner          = THIS_MODULE,
 562         .read           = seq_read,
 563         .open           = lparcfg_open,
 564         .release        = single_release,
 565 };
 566
 567 int __init lparcfg_init(void)
 568 {
 569         struct proc_dir_entry *ent;
 570         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 571
 572         /* Allow writing if we have FW_FEATURE_SPLPAR */
 573         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
 574                         !firmware_has_feature(FW_FEATURE_ISERIES)) {
 575                 lparcfg_fops.write = lparcfg_write;
 576                 mode |= S_IWUSR;
 577         }
 578
 579         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
 580         if (ent) {
 581                 ent->proc_fops = &lparcfg_fops;
 582                 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
 583                 if (!ent->data) {
 584                         printk(KERN_ERR
 585                                "Failed to allocate buffer for lparcfg\n");
 586                         remove_proc_entry("lparcfg", ent->parent);
 587                         return -ENOMEM;
 588                 }
 589         } else {
 590                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
 591                 return -EIO;
 592         }
 593
 594         proc_ppc64_lparcfg = ent;
 595         return 0;
 596 }
 597
 598 void __exit lparcfg_cleanup(void)
 599 {
 600         if (proc_ppc64_lparcfg) {
 601                 kfree(proc_ppc64_lparcfg->data);
 602                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 603         }
 604 }
 605
 606 module_init(lparcfg_init);
 607 module_exit(lparcfg_cleanup);
 608 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 609 MODULE_AUTHOR("Dave Engebretsen");
 610 MODULE_LICENSE("GPL");