arch/ppc64/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/HvLpConfig.h>
  30 #include <asm/iSeries/ItLpPaca.h>
  31 #include <asm/iSeries/LparData.h>
  32 #include <asm/hvcall.h>
  33 #include <asm/cputable.h>
  34 #include <asm/rtas.h>
  35 #include <asm/system.h>
  36
  37 #define MODULE_VERS "1.4"
  38 #define MODULE_NAME "lparcfg"
  39
  40 /* #define LPARCFG_DEBUG */
  41
  42 /* find a better place for this function... */
  43 void log_plpar_hcall_return(unsigned long rc, char *tag)
  44 {
  45         if (rc == 0)            /* success, return */
  46                 return;
  47 /* check for null tag ? */
  48         if (rc == H_Hardware)
  49                 printk(KERN_INFO
  50                        "plpar-hcall (%s) failed with hardware fault\n", tag);
  51         else if (rc == H_Function)
  52                 printk(KERN_INFO
  53                        "plpar-hcall (%s) failed; function not allowed\n", tag);
  54         else if (rc == H_Authority)
  55                 printk(KERN_INFO
  56                        "plpar-hcall (%s) failed; not authorized to this function\n",
  57                        tag);
  58         else if (rc == H_Parameter)
  59                 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
  60                        tag);
  61         else
  62                 printk(KERN_INFO
  63                        "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
  64                        tag, rc);
  65
  66 }
  67
  68 static struct proc_dir_entry *proc_ppc64_lparcfg;
  69 #define LPARCFG_BUFF_SIZE 4096
  70
  71 #ifdef CONFIG_PPC_ISERIES
  72
  73 #define lparcfg_write NULL
  74
  75 /*
  76  * Methods used to fetch LPAR data when running on an iSeries platform.
  77  */
  78 static int lparcfg_data(struct seq_file *m, void *v)
  79 {
  80         unsigned long pool_id, lp_index;
  81         int shared, entitled_capacity, max_entitled_capacity;
  82         int processors, max_processors;
  83         struct paca_struct *lpaca = get_paca();
  84
  85         shared = (int)(lpaca->lppaca_ptr->xSharedProc);
  86         seq_printf(m, "serial_number=%c%c%c%c%c%c%c\n",
  87                    e2a(xItExtVpdPanel.mfgID[2]),
  88                    e2a(xItExtVpdPanel.mfgID[3]),
  89                    e2a(xItExtVpdPanel.systemSerial[1]),
  90                    e2a(xItExtVpdPanel.systemSerial[2]),
  91                    e2a(xItExtVpdPanel.systemSerial[3]),
  92                    e2a(xItExtVpdPanel.systemSerial[4]),
  93                    e2a(xItExtVpdPanel.systemSerial[5]));
  94
  95         seq_printf(m, "system_type=%c%c%c%c\n",
  96                    e2a(xItExtVpdPanel.machineType[0]),
  97                    e2a(xItExtVpdPanel.machineType[1]),
  98                    e2a(xItExtVpdPanel.machineType[2]),
  99                    e2a(xItExtVpdPanel.machineType[3]));
 100
 101         lp_index = HvLpConfig_getLpIndex();
 102         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 103
 104         seq_printf(m, "system_active_processors=%d\n",
 105                    (int)HvLpConfig_getSystemPhysicalProcessors());
 106
 107         seq_printf(m, "system_potential_processors=%d\n",
 108                    (int)HvLpConfig_getSystemPhysicalProcessors());
 109
 110         processors = (int)HvLpConfig_getPhysicalProcessors();
 111         seq_printf(m, "partition_active_processors=%d\n", processors);
 112
 113         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
 114         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
 115
 116         if (shared) {
 117                 entitled_capacity = HvLpConfig_getSharedProcUnits();
 118                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
 119         } else {
 120                 entitled_capacity = processors * 100;
 121                 max_entitled_capacity = max_processors * 100;
 122         }
 123         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
 124
 125         seq_printf(m, "partition_max_entitled_capacity=%d\n",
 126                    max_entitled_capacity);
 127
 128         if (shared) {
 129                 pool_id = HvLpConfig_getSharedPoolIndex();
 130                 seq_printf(m, "pool=%d\n", (int)pool_id);
 131                 seq_printf(m, "pool_capacity=%d\n",
 132                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
 133                                  100));
 134         }
 135
 136         seq_printf(m, "shared_processor_mode=%d\n", shared);
 137
 138         return 0;
 139 }
 140 #endif                          /* CONFIG_PPC_ISERIES */
 141
 142 #ifdef CONFIG_PPC_PSERIES
 143 /*
 144  * Methods used to fetch LPAR data when running on a pSeries platform.
 145  */
 146
 147 /*
 148  * H_GET_PPP hcall returns info in 4 parms.
 149  *  entitled_capacity,unallocated_capacity,
 150  *  aggregation, resource_capability).
 151  *
 152  *  R4 = Entitled Processor Capacity Percentage.
 153  *  R5 = Unallocated Processor Capacity Percentage.
 154  *  R6 (AABBCCDDEEFFGGHH).
 155  *      XXXX - reserved (0)
 156  *          XXXX - reserved (0)
 157  *              XXXX - Group Number
 158  *                  XXXX - Pool Number.
 159  *  R7 (IIJJKKLLMMNNOOPP).
 160  *      XX - reserved. (0)
 161  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 162  *          XX - variable processor Capacity Weight
 163  *            XX - Unallocated Variable Processor Capacity Weight.
 164  *              XXXX - Active processors in Physical Processor Pool.
 165  *                  XXXX  - Processors active on platform.
 166  */
 167 static unsigned int h_get_ppp(unsigned long *entitled,
 168                               unsigned long *unallocated,
 169                               unsigned long *aggregation,
 170                               unsigned long *resource)
 171 {
 172         unsigned long rc;
 173         rc = plpar_hcall_4out(H_GET_PPP, 0, 0, 0, 0, entitled, unallocated,
 174                               aggregation, resource);
 175
 176         log_plpar_hcall_return(rc, "H_GET_PPP");
 177
 178         return rc;
 179 }
 180
 181 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
 182 {
 183         unsigned long rc;
 184         unsigned long dummy;
 185         rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
 186
 187         log_plpar_hcall_return(rc, "H_PIC");
 188 }
 189
 190 static unsigned long get_purr(void);
 191 /* ToDo:  get sum of purr across all processors.  The purr collection code
 192  * is coming, but at this time is still problematic, so for now this
 193  * function will return 0.
 194  */
 195 static unsigned long get_purr()
 196 {
 197         unsigned long sum_purr = 0;
 198         return sum_purr;
 199 }
 200
 201 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 202 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 203
 204 /*
 205  * parse_system_parameter_string()
 206  * Retrieve the potential_processors, max_entitled_capacity and friends
 207  * through the get-system-parameter rtas call.  Replace keyword strings as
 208  * necessary.
 209  */
 210 static void parse_system_parameter_string(struct seq_file *m)
 211 {
 212         int call_status;
 213
 214         char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 215         if (!local_buffer) {
 216                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 217                        __FILE__, __FUNCTION__, __LINE__);
 218                 return;
 219         }
 220
 221         spin_lock(&rtas_data_buf_lock);
 222         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 223         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 224                                 NULL,
 225                                 SPLPAR_CHARACTERISTICS_TOKEN,
 226                                 __pa(rtas_data_buf));
 227         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 228         spin_unlock(&rtas_data_buf_lock);
 229
 230         if (call_status != 0) {
 231                 printk(KERN_INFO
 232                        "%s %s Error calling get-system-parameter (0x%x)\n",
 233                        __FILE__, __FUNCTION__, call_status);
 234         } else {
 235                 int splpar_strlen;
 236                 int idx, w_idx;
 237                 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 238                 if (!workbuffer) {
 239                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 240                                __FILE__, __FUNCTION__, __LINE__);
 241                         return;
 242                 }
 243 #ifdef LPARCFG_DEBUG
 244                 printk(KERN_INFO "success calling get-system-parameter \n");
 245 #endif
 246                 splpar_strlen = local_buffer[0] * 16 + local_buffer[1];
 247                 local_buffer += 2;      /* step over strlen value */
 248
 249                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 250                 w_idx = 0;
 251                 idx = 0;
 252                 while ((*local_buffer) && (idx < splpar_strlen)) {
 253                         workbuffer[w_idx++] = local_buffer[idx++];
 254                         if ((local_buffer[idx] == ',')
 255                             || (local_buffer[idx] == '\0')) {
 256                                 workbuffer[w_idx] = '\0';
 257                                 if (w_idx) {
 258                                         /* avoid the empty string */
 259                                         seq_printf(m, "%s\n", workbuffer);
 260                                 }
 261                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 262                                 idx++;  /* skip the comma */
 263                                 w_idx = 0;
 264                         } else if (local_buffer[idx] == '=') {
 265                                 /* code here to replace workbuffer contents
 266                                    with different keyword strings */
 267                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 268                                         strcpy(workbuffer,
 269                                                "partition_max_entitled_capacity");
 270                                         w_idx = strlen(workbuffer);
 271                                 }
 272                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 273                                         strcpy(workbuffer,
 274                                                "system_potential_processors");
 275                                         w_idx = strlen(workbuffer);
 276                                 }
 277                         }
 278                 }
 279                 kfree(workbuffer);
 280                 local_buffer -= 2;      /* back up over strlen value */
 281         }
 282         kfree(local_buffer);
 283 }
 284
 285 static int lparcfg_count_active_processors(void);
 286
 287 /* Return the number of processors in the system.
 288  * This function reads through the device tree and counts
 289  * the virtual processors, this does not include threads.
 290  */
 291 static int lparcfg_count_active_processors(void)
 292 {
 293         struct device_node *cpus_dn = NULL;
 294         int count = 0;
 295
 296         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 297 #ifdef LPARCFG_DEBUG
 298                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
 299 #endif
 300                 count++;
 301         }
 302         return count;
 303 }
 304
 305 static int lparcfg_data(struct seq_file *m, void *v)
 306 {
 307         int partition_potential_processors;
 308         int partition_active_processors;
 309         struct device_node *rootdn;
 310         const char *model = "";
 311         const char *system_id = "";
 312         unsigned int *lp_index_ptr, lp_index = 0;
 313         struct device_node *rtas_node;
 314         int *lrdrp;
 315
 316         rootdn = find_path_device("/");
 317         if (rootdn) {
 318                 model = get_property(rootdn, "model", NULL);
 319                 system_id = get_property(rootdn, "system-id", NULL);
 320                 lp_index_ptr = (unsigned int *)
 321                     get_property(rootdn, "ibm,partition-no", NULL);
 322                 if (lp_index_ptr)
 323                         lp_index = *lp_index_ptr;
 324         }
 325
 326         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 327
 328         seq_printf(m, "serial_number=%s\n", system_id);
 329
 330         seq_printf(m, "system_type=%s\n", model);
 331
 332         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 333
 334         rtas_node = find_path_device("/rtas");
 335         lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 336
 337         if (lrdrp == NULL) {
 338                 partition_potential_processors = systemcfg->processorCount;
 339         } else {
 340                 partition_potential_processors = *(lrdrp + 4);
 341         }
 342
 343         partition_active_processors = lparcfg_count_active_processors();
 344
 345         if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
 346                 unsigned long h_entitled, h_unallocated;
 347                 unsigned long h_aggregation, h_resource;
 348                 unsigned long pool_idle_time, pool_procs;
 349                 unsigned long purr;
 350
 351                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
 352                           &h_resource);
 353
 354                 seq_printf(m, "R4=0x%lx\n", h_entitled);
 355                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
 356                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
 357                 seq_printf(m, "R7=0x%lx\n", h_resource);
 358
 359                 purr = get_purr();
 360
 361                 /* this call handles the ibm,get-system-parameter contents */
 362                 parse_system_parameter_string(m);
 363
 364                 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
 365
 366                 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
 367
 368                 seq_printf(m, "system_active_processors=%ld\n",
 369                            (h_resource >> 0 * 8) & 0xffff);
 370
 371                 /* pool related entries are apropriate for shared configs */
 372                 if (paca[0].lppaca.xSharedProc) {
 373
 374                         h_pic(&pool_idle_time, &pool_procs);
 375
 376                         seq_printf(m, "pool=%ld\n",
 377                                    (h_aggregation >> 0 * 8) & 0xffff);
 378
 379                         /* report pool_capacity in percentage */
 380                         seq_printf(m, "pool_capacity=%ld\n",
 381                                    ((h_resource >> 2 * 8) & 0xffff) * 100);
 382
 383                         seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 384
 385                         seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 386                 }
 387
 388                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
 389                            (h_resource >> 4 * 8) & 0xFF);
 390
 391                 seq_printf(m, "capacity_weight=%ld\n",
 392                            (h_resource >> 5 * 8) & 0xFF);
 393
 394                 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
 395
 396                 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
 397
 398                 seq_printf(m, "purr=%ld\n", purr);
 399
 400         } else {                /* non SPLPAR case */
 401
 402                 seq_printf(m, "system_active_processors=%d\n",
 403                            partition_potential_processors);
 404
 405                 seq_printf(m, "system_potential_processors=%d\n",
 406                            partition_potential_processors);
 407
 408                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 409                            partition_potential_processors * 100);
 410
 411                 seq_printf(m, "partition_entitled_capacity=%d\n",
 412                            partition_active_processors * 100);
 413         }
 414
 415         seq_printf(m, "partition_active_processors=%d\n",
 416                    partition_active_processors);
 417
 418         seq_printf(m, "partition_potential_processors=%d\n",
 419                    partition_potential_processors);
 420
 421         seq_printf(m, "shared_processor_mode=%d\n", paca[0].lppaca.xSharedProc);
 422
 423         return 0;
 424 }
 425
 426 /*
 427  * Interface for changing system parameters (variable capacity weight
 428  * and entitled capacity).  Format of input is "param_name=value";
 429  * anything after value is ignored.  Valid parameters at this time are
 430  * "partition_entitled_capacity" and "capacity_weight".  We use
 431  * H_SET_PPP to alter parameters.
 432  *
 433  * This function should be invoked only on systems with
 434  * FW_FEATURE_SPLPAR.
 435  */
 436 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 437                              size_t count, loff_t * off)
 438 {
 439         char *kbuf;
 440         char *tmp;
 441         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 442         u8 new_weight, *new_weight_ptr = &new_weight;
 443
 444         unsigned long current_entitled; /* parameters for h_get_ppp */
 445         unsigned long dummy;
 446         unsigned long resource;
 447         u8 current_weight;
 448
 449         ssize_t retval = -ENOMEM;
 450
 451         kbuf = kmalloc(count, GFP_KERNEL);
 452         if (!kbuf)
 453                 goto out;
 454
 455         retval = -EFAULT;
 456         if (copy_from_user(kbuf, buf, count))
 457                 goto out;
 458
 459         retval = -EINVAL;
 460         kbuf[count - 1] = '\0';
 461         tmp = strchr(kbuf, '=');
 462         if (!tmp)
 463                 goto out;
 464
 465         *tmp++ = '\0';
 466
 467         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 468                 char *endp;
 469                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 470                 if (endp == tmp)
 471                         goto out;
 472                 new_weight_ptr = &current_weight;
 473         } else if (!strcmp(kbuf, "capacity_weight")) {
 474                 char *endp;
 475                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 476                 if (endp == tmp)
 477                         goto out;
 478                 new_entitled_ptr = &current_entitled;
 479         } else
 480                 goto out;
 481
 482         /* Get our current parameters */
 483         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
 484         if (retval) {
 485                 retval = -EIO;
 486                 goto out;
 487         }
 488
 489         current_weight = (resource >> 5 * 8) & 0xFF;
 490
 491         pr_debug("%s: current_entitled = %lu, current_weight = %lu\n",
 492                  __FUNCTION__, current_entitled, current_weight);
 493
 494         pr_debug("%s: new_entitled = %lu, new_weight = %lu\n",
 495                  __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
 496
 497         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
 498                                     *new_weight_ptr);
 499
 500         if (retval == H_Success || retval == H_Constrained) {
 501                 retval = count;
 502         } else if (retval == H_Busy) {
 503                 retval = -EBUSY;
 504         } else if (retval == H_Hardware) {
 505                 retval = -EIO;
 506         } else if (retval == H_Parameter) {
 507                 retval = -EINVAL;
 508         } else {
 509                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
 510                        __FUNCTION__, retval);
 511                 retval = -EIO;
 512         }
 513
 514       out:
 515         kfree(kbuf);
 516         return retval;
 517 }
 518
 519 #endif                          /* CONFIG_PPC_PSERIES */
 520
 521 static int lparcfg_open(struct inode *inode, struct file *file)
 522 {
 523         return single_open(file, lparcfg_data, NULL);
 524 }
 525
 526 struct file_operations lparcfg_fops = {
 527       owner:THIS_MODULE,
 528       read:seq_read,
 529       open:lparcfg_open,
 530       release:single_release,
 531 };
 532
 533 int __init lparcfg_init(void)
 534 {
 535         struct proc_dir_entry *ent;
 536         mode_t mode = S_IRUSR;
 537
 538         /* Allow writing if we have FW_FEATURE_SPLPAR */
 539         if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
 540                 lparcfg_fops.write = lparcfg_write;
 541                 mode |= S_IWUSR;
 542         }
 543
 544         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
 545         if (ent) {
 546                 ent->proc_fops = &lparcfg_fops;
 547                 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
 548                 if (!ent->data) {
 549                         printk(KERN_ERR
 550                                "Failed to allocate buffer for lparcfg\n");
 551                         remove_proc_entry("lparcfg", ent->parent);
 552                         return -ENOMEM;
 553                 }
 554         } else {
 555                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
 556                 return -EIO;
 557         }
 558
 559         proc_ppc64_lparcfg = ent;
 560         return 0;
 561 }
 562
 563 void __exit lparcfg_cleanup(void)
 564 {
 565         if (proc_ppc64_lparcfg) {
 566                 if (proc_ppc64_lparcfg->data) {
 567                         kfree(proc_ppc64_lparcfg->data);
 568                 }
 569                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 570         }
 571 }
 572
 573 module_init(lparcfg_init);
 574 module_exit(lparcfg_cleanup);
 575 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 576 MODULE_AUTHOR("Dave Engebretsen");
 577 MODULE_LICENSE("GPL");