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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 unsigned h_pic(unsigned long *pool_idle_time,
 171                       unsigned long *num_procs)
 172 {
 173         unsigned long rc;
 174         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 175
 176         rc = plpar_hcall(H_PIC, retbuf);
 177
 178         *pool_idle_time = retbuf[0];
 179         *num_procs = retbuf[1];
 180
 181         return rc;
 182 }
 183
 184 /*
 185  * parse_ppp_data
 186  * Parse out the data returned from h_get_ppp and h_pic
 187  */
 188 static void parse_ppp_data(struct seq_file *m)
 189 {
 190         unsigned long h_entitled, h_unallocated;
 191         unsigned long h_aggregation, h_resource;
 192         int rc;
 193
 194         rc = h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
 195                        &h_resource);
 196         if (rc)
 197                 return;
 198
 199         seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
 200         seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
 201         seq_printf(m, "system_active_processors=%ld\n",
 202                    (h_resource >> 0 * 8) & 0xffff);
 203
 204         /* pool related entries are apropriate for shared configs */
 205         if (lppaca[0].shared_proc) {
 206                 unsigned long pool_idle_time, pool_procs;
 207
 208                 seq_printf(m, "pool=%ld\n", (h_aggregation >> 0 * 8) & 0xffff);
 209
 210                 /* report pool_capacity in percentage */
 211                 seq_printf(m, "pool_capacity=%ld\n",
 212                            ((h_resource >> 2 * 8) & 0xffff) * 100);
 213
 214                 h_pic(&pool_idle_time, &pool_procs);
 215                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 216                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 217         }
 218
 219         seq_printf(m, "unallocated_capacity_weight=%ld\n",
 220                    (h_resource >> 4 * 8) & 0xFF);
 221
 222         seq_printf(m, "capacity_weight=%ld\n", (h_resource >> 5 * 8) & 0xFF);
 223         seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
 224         seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
 225 }
 226
 227 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 228 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 229
 230 /*
 231  * parse_system_parameter_string()
 232  * Retrieve the potential_processors, max_entitled_capacity and friends
 233  * through the get-system-parameter rtas call.  Replace keyword strings as
 234  * necessary.
 235  */
 236 static void parse_system_parameter_string(struct seq_file *m)
 237 {
 238         int call_status;
 239
 240         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 241         if (!local_buffer) {
 242                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 243                        __FILE__, __func__, __LINE__);
 244                 return;
 245         }
 246
 247         spin_lock(&rtas_data_buf_lock);
 248         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 249         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 250                                 NULL,
 251                                 SPLPAR_CHARACTERISTICS_TOKEN,
 252                                 __pa(rtas_data_buf),
 253                                 RTAS_DATA_BUF_SIZE);
 254         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 255         spin_unlock(&rtas_data_buf_lock);
 256
 257         if (call_status != 0) {
 258                 printk(KERN_INFO
 259                        "%s %s Error calling get-system-parameter (0x%x)\n",
 260                        __FILE__, __func__, call_status);
 261         } else {
 262                 int splpar_strlen;
 263                 int idx, w_idx;
 264                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 265                 if (!workbuffer) {
 266                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 267                                __FILE__, __func__, __LINE__);
 268                         kfree(local_buffer);
 269                         return;
 270                 }
 271 #ifdef LPARCFG_DEBUG
 272                 printk(KERN_INFO "success calling get-system-parameter \n");
 273 #endif
 274                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 275                 local_buffer += 2;      /* step over strlen value */
 276
 277                 w_idx = 0;
 278                 idx = 0;
 279                 while ((*local_buffer) && (idx < splpar_strlen)) {
 280                         workbuffer[w_idx++] = local_buffer[idx++];
 281                         if ((local_buffer[idx] == ',')
 282                             || (local_buffer[idx] == '\0')) {
 283                                 workbuffer[w_idx] = '\0';
 284                                 if (w_idx) {
 285                                         /* avoid the empty string */
 286                                         seq_printf(m, "%s\n", workbuffer);
 287                                 }
 288                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 289                                 idx++;  /* skip the comma */
 290                                 w_idx = 0;
 291                         } else if (local_buffer[idx] == '=') {
 292                                 /* code here to replace workbuffer contents
 293                                    with different keyword strings */
 294                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 295                                         strcpy(workbuffer,
 296                                                "partition_max_entitled_capacity");
 297                                         w_idx = strlen(workbuffer);
 298                                 }
 299                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 300                                         strcpy(workbuffer,
 301                                                "system_potential_processors");
 302                                         w_idx = strlen(workbuffer);
 303                                 }
 304                         }
 305                 }
 306                 kfree(workbuffer);
 307                 local_buffer -= 2;      /* back up over strlen value */
 308         }
 309         kfree(local_buffer);
 310 }
 311
 312 /* Return the number of processors in the system.
 313  * This function reads through the device tree and counts
 314  * the virtual processors, this does not include threads.
 315  */
 316 static int lparcfg_count_active_processors(void)
 317 {
 318         struct device_node *cpus_dn = NULL;
 319         int count = 0;
 320
 321         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 322 #ifdef LPARCFG_DEBUG
 323                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
 324 #endif
 325                 count++;
 326         }
 327         return count;
 328 }
 329
 330 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 331 {
 332         int partition_potential_processors;
 333         int partition_active_processors;
 334         struct device_node *rtas_node;
 335         const int *lrdrp = NULL;
 336
 337         rtas_node = of_find_node_by_path("/rtas");
 338         if (rtas_node)
 339                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 340
 341         if (lrdrp == NULL) {
 342                 partition_potential_processors = vdso_data->processorCount;
 343         } else {
 344                 partition_potential_processors = *(lrdrp + 4);
 345         }
 346         of_node_put(rtas_node);
 347
 348         partition_active_processors = lparcfg_count_active_processors();
 349
 350         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 351                 /* this call handles the ibm,get-system-parameter contents */
 352                 parse_system_parameter_string(m);
 353                 parse_ppp_data(m);
 354
 355                 seq_printf(m, "purr=%ld\n", get_purr());
 356         } else {                /* non SPLPAR case */
 357
 358                 seq_printf(m, "system_active_processors=%d\n",
 359                            partition_potential_processors);
 360
 361                 seq_printf(m, "system_potential_processors=%d\n",
 362                            partition_potential_processors);
 363
 364                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 365                            partition_potential_processors * 100);
 366
 367                 seq_printf(m, "partition_entitled_capacity=%d\n",
 368                            partition_active_processors * 100);
 369         }
 370
 371         seq_printf(m, "partition_active_processors=%d\n",
 372                    partition_active_processors);
 373
 374         seq_printf(m, "partition_potential_processors=%d\n",
 375                    partition_potential_processors);
 376
 377         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 378
 379         return 0;
 380 }
 381
 382 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 383 {
 384         unsigned long current_entitled;
 385         unsigned long dummy;
 386         unsigned long resource;
 387         u8 current_weight, new_weight;
 388         u64 new_entitled;
 389         ssize_t retval;
 390
 391         /* Get our current parameters */
 392         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
 393         if (retval)
 394                 return retval;
 395
 396         current_weight = (resource >> 5 * 8) & 0xFF;
 397
 398         if (entitlement) {
 399                 new_weight = current_weight;
 400                 new_entitled = *entitlement;
 401         } else if (weight) {
 402                 new_weight = *weight;
 403                 new_entitled = current_entitled;
 404         } else
 405                 return -EINVAL;
 406
 407         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 408                  __FUNCTION__, current_entitled, current_weight);
 409
 410         pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
 411                  __FUNCTION__, new_entitled, new_weight);
 412
 413         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 414         return retval;
 415 }
 416
 417 /*
 418  * Interface for changing system parameters (variable capacity weight
 419  * and entitled capacity).  Format of input is "param_name=value";
 420  * anything after value is ignored.  Valid parameters at this time are
 421  * "partition_entitled_capacity" and "capacity_weight".  We use
 422  * H_SET_PPP to alter parameters.
 423  *
 424  * This function should be invoked only on systems with
 425  * FW_FEATURE_SPLPAR.
 426  */
 427 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 428                              size_t count, loff_t * off)
 429 {
 430         char *kbuf;
 431         char *tmp;
 432         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 433         u8 new_weight, *new_weight_ptr = &new_weight;
 434         ssize_t retval = -ENOMEM;
 435
 436         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
 437                         firmware_has_feature(FW_FEATURE_ISERIES))
 438                 return -EINVAL;
 439
 440         kbuf = kmalloc(count, GFP_KERNEL);
 441         if (!kbuf)
 442                 goto out;
 443
 444         retval = -EFAULT;
 445         if (copy_from_user(kbuf, buf, count))
 446                 goto out;
 447
 448         retval = -EINVAL;
 449         kbuf[count - 1] = '\0';
 450         tmp = strchr(kbuf, '=');
 451         if (!tmp)
 452                 goto out;
 453
 454         *tmp++ = '\0';
 455
 456         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 457                 char *endp;
 458                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 459                 if (endp == tmp)
 460                         goto out;
 461
 462                 retval = update_ppp(new_entitled_ptr, NULL);
 463         } else if (!strcmp(kbuf, "capacity_weight")) {
 464                 char *endp;
 465                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 466                 if (endp == tmp)
 467                         goto out;
 468
 469                 retval = update_ppp(NULL, new_weight_ptr);
 470         } else
 471                 goto out;
 472
 473         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 474                 retval = count;
 475         } else if (retval == H_BUSY) {
 476                 retval = -EBUSY;
 477         } else if (retval == H_HARDWARE) {
 478                 retval = -EIO;
 479         } else if (retval == H_PARAMETER) {
 480                 retval = -EINVAL;
 481         } else {
 482                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
 483                        __func__, retval);
 484                 retval = -EIO;
 485         }
 486
 487 out:
 488         kfree(kbuf);
 489         return retval;
 490 }
 491
 492 #else                           /* CONFIG_PPC_PSERIES */
 493
 494 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 495 {
 496         return 0;
 497 }
 498
 499 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 500                              size_t count, loff_t * off)
 501 {
 502         return -EINVAL;
 503 }
 504
 505 #endif                          /* CONFIG_PPC_PSERIES */
 506
 507 static int lparcfg_data(struct seq_file *m, void *v)
 508 {
 509         struct device_node *rootdn;
 510         const char *model = "";
 511         const char *system_id = "";
 512         const char *tmp;
 513         const unsigned int *lp_index_ptr;
 514         unsigned int lp_index = 0;
 515
 516         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 517
 518         rootdn = of_find_node_by_path("/");
 519         if (rootdn) {
 520                 tmp = of_get_property(rootdn, "model", NULL);
 521                 if (tmp) {
 522                         model = tmp;
 523                         /* Skip "IBM," - see platforms/iseries/dt.c */
 524                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 525                                 model += 4;
 526                 }
 527                 tmp = of_get_property(rootdn, "system-id", NULL);
 528                 if (tmp) {
 529                         system_id = tmp;
 530                         /* Skip "IBM," - see platforms/iseries/dt.c */
 531                         if (firmware_has_feature(FW_FEATURE_ISERIES))
 532                                 system_id += 4;
 533                 }
 534                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 535                                         NULL);
 536                 if (lp_index_ptr)
 537                         lp_index = *lp_index_ptr;
 538                 of_node_put(rootdn);
 539         }
 540         seq_printf(m, "serial_number=%s\n", system_id);
 541         seq_printf(m, "system_type=%s\n", model);
 542         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 543
 544         if (firmware_has_feature(FW_FEATURE_ISERIES))
 545                 return iseries_lparcfg_data(m, v);
 546         return pseries_lparcfg_data(m, v);
 547 }
 548
 549 static int lparcfg_open(struct inode *inode, struct file *file)
 550 {
 551         return single_open(file, lparcfg_data, NULL);
 552 }
 553
 554 static const struct file_operations lparcfg_fops = {
 555         .owner          = THIS_MODULE,
 556         .read           = seq_read,
 557         .write          = lparcfg_write,
 558         .open           = lparcfg_open,
 559         .release        = single_release,
 560 };
 561
 562 static int __init lparcfg_init(void)
 563 {
 564         struct proc_dir_entry *ent;
 565         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 566
 567         /* Allow writing if we have FW_FEATURE_SPLPAR */
 568         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
 569                         !firmware_has_feature(FW_FEATURE_ISERIES))
 570                 mode |= S_IWUSR;
 571
 572         ent = proc_create("ppc64/lparcfg", mode, NULL, &lparcfg_fops);
 573         if (!ent) {
 574                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
 575                 return -EIO;
 576         }
 577
 578         proc_ppc64_lparcfg = ent;
 579         return 0;
 580 }
 581
 582 static void __exit lparcfg_cleanup(void)
 583 {
 584         if (proc_ppc64_lparcfg)
 585                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 586 }
 587
 588 module_init(lparcfg_init);
 589 module_exit(lparcfg_cleanup);
 590 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 591 MODULE_AUTHOR("Dave Engebretsen");
 592 MODULE_LICENSE("GPL");