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