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 "1.3"
  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 "plpar-hcall (%s) failed with hardware fault\n",tag);
  50         else if (rc == H_Function)
  51                 printk(KERN_INFO "plpar-hcall (%s) failed; function not allowed\n",tag);
  52         else if (rc == H_Authority)
  53                 printk(KERN_INFO "plpar-hcall (%s) failed; not authorized to this function\n",tag);
  54         else if (rc == H_Parameter)
  55                 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",tag);
  56         else
  57                 printk(KERN_INFO "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",tag,rc);
  58
  59 }
  60
  61
  62 static struct proc_dir_entry *proc_ppc64_lparcfg;
  63 #define LPARCFG_BUFF_SIZE 4096
  64
  65 #ifdef CONFIG_PPC_ISERIES
  66
  67 #define lparcfg_write NULL
  68
  69 /*
  70  * Methods used to fetch LPAR data when running on an iSeries platform.
  71  */
  72 static int lparcfg_data(struct seq_file *m, void *v)
  73 {
  74         unsigned long pool_id, lp_index;
  75         int shared, entitled_capacity, max_entitled_capacity;
  76         int processors, max_processors;
  77         struct paca_struct *lpaca = get_paca();
  78
  79         shared = (int)(lpaca->lppaca_ptr->xSharedProc);
  80         seq_printf(m, "serial_number=%c%c%c%c%c%c%c\n",
  81                       e2a(xItExtVpdPanel.mfgID[2]),
  82                       e2a(xItExtVpdPanel.mfgID[3]),
  83                       e2a(xItExtVpdPanel.systemSerial[1]),
  84                       e2a(xItExtVpdPanel.systemSerial[2]),
  85                       e2a(xItExtVpdPanel.systemSerial[3]),
  86                       e2a(xItExtVpdPanel.systemSerial[4]),
  87                       e2a(xItExtVpdPanel.systemSerial[5]));
  88
  89         seq_printf(m, "system_type=%c%c%c%c\n",
  90                       e2a(xItExtVpdPanel.machineType[0]),
  91                       e2a(xItExtVpdPanel.machineType[1]),
  92                       e2a(xItExtVpdPanel.machineType[2]),
  93                       e2a(xItExtVpdPanel.machineType[3]));
  94
  95         lp_index = HvLpConfig_getLpIndex();
  96         seq_printf(m, "partition_id=%d\n", (int)lp_index);
  97
  98         seq_printf(m, "system_active_processors=%d\n",
  99                       (int)HvLpConfig_getSystemPhysicalProcessors());
 100
 101         seq_printf(m, "system_potential_processors=%d\n",
 102                       (int)HvLpConfig_getSystemPhysicalProcessors());
 103
 104         processors = (int)HvLpConfig_getPhysicalProcessors();
 105         seq_printf(m, "partition_active_processors=%d\n", processors);
 106
 107         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
 108         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
 109
 110         if(shared) {
 111                 entitled_capacity = HvLpConfig_getSharedProcUnits();
 112                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
 113         } else {
 114                 entitled_capacity = processors * 100;
 115                 max_entitled_capacity = max_processors * 100;
 116         }
 117         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
 118
 119         seq_printf(m, "partition_max_entitled_capacity=%d\n",
 120                       max_entitled_capacity);
 121
 122         if(shared) {
 123                 pool_id = HvLpConfig_getSharedPoolIndex();
 124                 seq_printf(m, "pool=%d\n", (int)pool_id);
 125                 seq_printf(m, "pool_capacity=%d\n",
 126                     (int)(HvLpConfig_getNumProcsInSharedPool(pool_id)*100));
 127         }
 128
 129         seq_printf(m, "shared_processor_mode=%d\n", shared);
 130
 131         return 0;
 132 }
 133 #endif /* CONFIG_PPC_ISERIES */
 134
 135 #ifdef CONFIG_PPC_PSERIES
 136 /*
 137  * Methods used to fetch LPAR data when running on a pSeries platform.
 138  */
 139
 140 /*
 141  * H_GET_PPP hcall returns info in 4 parms.
 142  *  entitled_capacity,unallocated_capacity,
 143  *  aggregation, resource_capability).
 144  *
 145  *  R4 = Entitled Processor Capacity Percentage.
 146  *  R5 = Unallocated Processor Capacity Percentage.
 147  *  R6 (AABBCCDDEEFFGGHH).
 148  *      XXXX - reserved (0)
 149  *          XXXX - reserved (0)
 150  *              XXXX - Group Number
 151  *                  XXXX - Pool Number.
 152  *  R7 (IIJJKKLLMMNNOOPP).
 153  *      XX - reserved. (0)
 154  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 155  *          XX - variable processor Capacity Weight
 156  *            XX - Unallocated Variable Processor Capacity Weight.
 157  *              XXXX - Active processors in Physical Processor Pool.
 158  *                  XXXX  - Processors active on platform.
 159  */
 160 static unsigned int h_get_ppp(unsigned long *entitled,
 161                 unsigned long  *unallocated, unsigned long *aggregation,
 162                 unsigned long *resource)
 163 {
 164         unsigned long rc;
 165         rc = plpar_hcall_4out(H_GET_PPP,0,0,0,0,entitled,unallocated,aggregation,resource);
 166
 167         log_plpar_hcall_return(rc, "H_GET_PPP");
 168
 169         return rc;
 170 }
 171
 172 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
 173 {
 174         unsigned long rc;
 175         unsigned long dummy;
 176         rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
 177
 178         log_plpar_hcall_return(rc, "H_PIC");
 179 }
 180
 181 static unsigned long get_purr(void);
 182 /* ToDo:  get sum of purr across all processors.  The purr collection code
 183  * is coming, but at this time is still problematic, so for now this
 184  * function will return 0.
 185  */
 186 static unsigned long get_purr()
 187 {
 188         unsigned long sum_purr=0;
 189         return sum_purr;
 190 }
 191
 192 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 193 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 194
 195 /*
 196  * parse_system_parameter_string()
 197  * Retrieve the potential_processors, max_entitled_capacity and friends
 198  * through the get-system-parameter rtas call.  Replace keyword strings as
 199  * necessary.
 200  */
 201 static void parse_system_parameter_string(struct seq_file *m)
 202 {
 203         int call_status;
 204
 205         char * local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 206         if (!local_buffer) {
 207                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
 208                        __FILE__, __FUNCTION__, __LINE__);
 209                 return;
 210         }
 211
 212         spin_lock(&rtas_data_buf_lock);
 213         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 214         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 215                                 NULL,
 216                                 SPLPAR_CHARACTERISTICS_TOKEN,
 217                                 __pa(rtas_data_buf));
 218         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 219         spin_unlock(&rtas_data_buf_lock);
 220
 221         if (call_status != 0) {
 222                 printk(KERN_INFO "%s %s Error calling get-system-parameter (0x%x)\n",
 223                        __FILE__, __FUNCTION__, call_status);
 224         } else {
 225                 int splpar_strlen;
 226                 int idx, w_idx;
 227                 char * workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 228                 if (!workbuffer) {
 229                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",__FILE__,__FUNCTION__,__LINE__);
 230                         return;
 231                 }
 232
 233 #ifdef LPARCFG_DEBUG
 234                 printk(KERN_INFO "success calling get-system-parameter \n");
 235 #endif
 236                 splpar_strlen = local_buffer[0] * 16 + local_buffer[1];
 237                 local_buffer += 2; /* step over strlen value */
 238
 239                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 240                 w_idx = 0;
 241                 idx = 0;
 242                 while ((*local_buffer) && (idx < splpar_strlen)) {
 243                         workbuffer[w_idx++] = local_buffer[idx++];
 244                         if ((local_buffer[idx] == ',')
 245                             || (local_buffer[idx] == '\0')) {
 246                                 workbuffer[w_idx] = '\0';
 247                                 if (w_idx) {
 248                                         /* avoid the empty string */
 249                                         seq_printf(m, "%s\n", workbuffer);
 250                                 }
 251                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 252                                 idx++;  /* skip the comma */
 253                                 w_idx = 0;
 254                         } else if (local_buffer[idx] == '=') {
 255                                 /* code here to replace workbuffer contents
 256                                  with different keyword strings */
 257                                 if (0 == strcmp(workbuffer,"MaxEntCap")) {
 258                                         strcpy(workbuffer, "partition_max_entitled_capacity");
 259                                         w_idx = strlen(workbuffer);
 260                                 }
 261                                 if (0 == strcmp(workbuffer,"MaxPlatProcs")) {
 262                                         strcpy(workbuffer, "system_potential_processors");
 263                                         w_idx = strlen(workbuffer);
 264                                 }
 265                         }
 266                 }
 267                 kfree(workbuffer);
 268                 local_buffer -= 2;      /* back up over strlen value */
 269         }
 270         kfree(local_buffer);
 271 }
 272
 273 static int lparcfg_count_active_processors(void);
 274
 275 /* Return the number of processors in the system.
 276  * This function reads through the device tree and counts
 277  * the virtual processors, this does not include threads.
 278  */
 279 static int lparcfg_count_active_processors(void)
 280 {
 281         struct device_node *cpus_dn = NULL;
 282         int count = 0;
 283
 284         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
 285 #ifdef LPARCFG_DEBUG
 286                 printk(KERN_ERR "cpus_dn %p \n",cpus_dn);
 287 #endif
 288                 count++;
 289         }
 290         return count;
 291 }
 292
 293 static int lparcfg_data(struct seq_file *m, void *v)
 294 {
 295         int system_active_processors;
 296         struct device_node *rootdn;
 297         const char *model = "";
 298         const char *system_id = "";
 299         unsigned int *lp_index_ptr, lp_index = 0;
 300         struct device_node *rtas_node;
 301         int *lrdrp;
 302
 303         rootdn = find_path_device("/");
 304         if (rootdn) {
 305                 model = get_property(rootdn, "model", NULL);
 306                 system_id = get_property(rootdn, "system-id", NULL);
 307                 lp_index_ptr = (unsigned int *)
 308                         get_property(rootdn, "ibm,partition-no", NULL);
 309                 if (lp_index_ptr)
 310                         lp_index = *lp_index_ptr;
 311         }
 312
 313
 314         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 315
 316         seq_printf(m, "serial_number=%s\n", system_id);
 317
 318         seq_printf(m, "system_type=%s\n", model);
 319
 320         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 321
 322         rtas_node = find_path_device("/rtas");
 323         lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 324
 325         if (lrdrp == NULL) {
 326                 system_active_processors = systemcfg->processorCount;
 327         } else {
 328                 system_active_processors = *(lrdrp + 4);
 329         }
 330
 331         if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
 332                 unsigned long h_entitled, h_unallocated;
 333                 unsigned long h_aggregation, h_resource;
 334                 unsigned long pool_idle_time, pool_procs;
 335                 unsigned long purr;
 336
 337                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
 338                           &h_resource);
 339
 340                 seq_printf(m, "R4=0x%lx\n", h_entitled);
 341                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
 342                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
 343                 seq_printf(m, "R7=0x%lx\n", h_resource);
 344
 345                 h_pic(&pool_idle_time, &pool_procs);
 346
 347                 purr = get_purr();
 348
 349                 /* this call handles the ibm,get-system-parameter contents */
 350                 parse_system_parameter_string(m);
 351
 352                 seq_printf(m, "partition_entitled_capacity=%ld\n",
 353                               h_entitled);
 354
 355                 seq_printf(m, "pool=%ld\n",
 356                               (h_aggregation >> 0*8) & 0xffff);
 357
 358                 seq_printf(m, "group=%ld\n",
 359                               (h_aggregation >> 2*8) & 0xffff);
 360
 361                 seq_printf(m, "system_active_processors=%ld\n",
 362                               (h_resource >> 0*8) & 0xffff);
 363
 364                 seq_printf(m, "pool_capacity=%ld\n",
 365                               (h_resource >> 2*8) & 0xffff);
 366
 367                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
 368                               (h_resource >> 4*8) & 0xFF);
 369
 370                 seq_printf(m, "capacity_weight=%ld\n",
 371                               (h_resource >> 5*8) & 0xFF);
 372
 373                 seq_printf(m, "capped=%ld\n",
 374                               (h_resource >> 6*8) & 0x01);
 375
 376                 seq_printf(m, "unallocated_capacity=%ld\n",
 377                               h_unallocated);
 378
 379                 seq_printf(m, "pool_idle_time=%ld\n",
 380                               pool_idle_time);
 381
 382                 seq_printf(m, "pool_num_procs=%ld\n",
 383                               pool_procs);
 384
 385                 seq_printf(m, "purr=%ld\n",
 386                               purr);
 387
 388         } else /* non SPLPAR case */ {
 389                 seq_printf(m, "system_active_processors=%d\n",
 390                               system_active_processors);
 391
 392                 seq_printf(m, "system_potential_processors=%d\n",
 393                               system_active_processors);
 394
 395                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 396                               100*system_active_processors);
 397
 398                 seq_printf(m, "partition_entitled_capacity=%d\n",
 399                               system_active_processors*100);
 400         }
 401
 402         seq_printf(m, "partition_active_processors=%d\n",
 403                         (int) lparcfg_count_active_processors());
 404
 405         seq_printf(m, "partition_potential_processors=%d\n",
 406                         system_active_processors);
 407
 408         seq_printf(m, "shared_processor_mode=%d\n",
 409                         paca[0].lppaca.xSharedProc);
 410
 411         return 0;
 412 }
 413
 414 /*
 415  * Interface for changing system parameters (variable capacity weight
 416  * and entitled capacity).  Format of input is "param_name=value";
 417  * anything after value is ignored.  Valid parameters at this time are
 418  * "partition_entitled_capacity" and "capacity_weight".  We use
 419  * H_SET_PPP to alter parameters.
 420  *
 421  * This function should be invoked only on systems with
 422  * FW_FEATURE_SPLPAR.
 423  */
 424 static ssize_t lparcfg_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
 425 {
 426         char *kbuf;
 427         char *tmp;
 428         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 429         u8 new_weight, *new_weight_ptr = &new_weight;
 430
 431         unsigned long current_entitled;    /* parameters for h_get_ppp */
 432         unsigned long dummy;
 433         unsigned long resource;
 434         u8 current_weight;
 435
 436         ssize_t retval = -ENOMEM;
 437
 438         kbuf = kmalloc(count, GFP_KERNEL);
 439         if (!kbuf)
 440                 goto out;
 441
 442         retval = -EFAULT;
 443         if (copy_from_user(kbuf, buf, count))
 444                 goto out;
 445
 446         retval = -EINVAL;
 447         kbuf[count - 1] = '\0';
 448         tmp = strchr(kbuf, '=');
 449         if (!tmp)
 450                 goto out;
 451
 452         *tmp++ = '\0';
 453
 454         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 455                 char *endp;
 456                 *new_entitled_ptr = (u64)simple_strtoul(tmp, &endp, 10);
 457                 if (endp == tmp)
 458                         goto out;
 459                 new_weight_ptr = &current_weight;
 460         } else if (!strcmp(kbuf, "capacity_weight")) {
 461                 char *endp;
 462                 *new_weight_ptr = (u8)simple_strtoul(tmp, &endp, 10);
 463                 if (endp == tmp)
 464                         goto out;
 465                 new_entitled_ptr = &current_entitled;
 466         } else
 467                 goto out;
 468
 469         /* Get our current parameters */
 470         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
 471         if (retval) {
 472                 retval = -EIO;
 473                 goto out;
 474         }
 475
 476         current_weight = (resource>>5*8)&0xFF;
 477
 478         pr_debug("%s: current_entitled = %lu, current_weight = %lu\n",
 479                  __FUNCTION__, current_entitled, current_weight);
 480
 481         pr_debug("%s: new_entitled = %lu, new_weight = %lu\n",
 482                  __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
 483
 484         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
 485                                     *new_weight_ptr);
 486
 487         if (retval == H_Success || retval == H_Constrained) {
 488                 retval = count;
 489         } else if (retval == H_Busy) {
 490                 retval = -EBUSY;
 491         } else if (retval == H_Hardware) {
 492                 retval = -EIO;
 493         } else if (retval == H_Parameter) {
 494                 retval = -EINVAL;
 495         } else {
 496                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
 497                        __FUNCTION__, retval);
 498                 retval = -EIO;
 499         }
 500
 501 out:
 502         kfree(kbuf);
 503         return retval;
 504 }
 505
 506 #endif /* CONFIG_PPC_PSERIES */
 507
 508 static int lparcfg_open(struct inode * inode, struct file * file)
 509 {
 510         return single_open(file,lparcfg_data,NULL);
 511 }
 512
 513 struct file_operations lparcfg_fops = {
 514         owner:          THIS_MODULE,
 515         read:           seq_read,
 516         open:           lparcfg_open,
 517         release:        single_release,
 518 };
 519
 520 int __init lparcfg_init(void)
 521 {
 522         struct proc_dir_entry *ent;
 523         mode_t mode = S_IRUSR;
 524
 525         /* Allow writing if we have FW_FEATURE_SPLPAR */
 526         if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
 527                 lparcfg_fops.write = lparcfg_write;
 528                 mode |= S_IWUSR;
 529         }
 530
 531         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
 532         if (ent) {
 533                 ent->proc_fops = &lparcfg_fops;
 534                 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
 535                 if (!ent->data) {
 536                         printk(KERN_ERR "Failed to allocate buffer for lparcfg\n");
 537                         remove_proc_entry("lparcfg", ent->parent);
 538                         return -ENOMEM;
 539                 }
 540         } else {
 541                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
 542                 return -EIO;
 543         }
 544
 545         proc_ppc64_lparcfg = ent;
 546         return 0;
 547 }
 548
 549 void __exit lparcfg_cleanup(void)
 550 {
 551         if (proc_ppc64_lparcfg) {
 552                 if (proc_ppc64_lparcfg->data) {
 553                     kfree(proc_ppc64_lparcfg->data);
 554                 }
 555                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
 556         }
 557 }
 558
 559 module_init(lparcfg_init);
 560 module_exit(lparcfg_cleanup);
 561 MODULE_DESCRIPTION("Interface for LPAR configuration data");
 562 MODULE_AUTHOR("Dave Engebretsen");
 563 MODULE_LICENSE("GPL");