root/arch/powerpc/platforms/pseries/lparcfg.c

DEFINITIONS

1. cpu_get_purr
2. get_purr
3. h_get_ppp
4. h_pic
5. parse_ppp_data
6. parse_mpp_data
7. parse_mpp_x_data
8. parse_system_parameter_string
9. lparcfg_count_active_processors
10. pseries_cmo_data
11. splpar_dispatch_data
12. parse_em_data
13. maxmem_data
14. pseries_lparcfg_data
15. update_ppp
16. update_mpp
17. lparcfg_write
18. lparcfg_data
19. lparcfg_open
20. lparcfg_init

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * PowerPC64 LPAR Configuration Information Driver
   4  *
   5  * Dave Engebretsen engebret@us.ibm.com
   6  *    Copyright (c) 2003 Dave Engebretsen
   7  * Will Schmidt willschm@us.ibm.com
   8  *    SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
   9  *    seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
  10  * Nathan Lynch nathanl@austin.ibm.com
  11  *    Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
  12  *
  13  * This driver creates a proc file at /proc/ppc64/lparcfg which contains
  14  * keyword - value pairs that specify the configuration of the partition.
  15  */
  16 
  17 #include <linux/module.h>
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/init.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/slab.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/hugetlb.h>
  26 #include <asm/lppaca.h>
  27 #include <asm/hvcall.h>
  28 #include <asm/firmware.h>
  29 #include <asm/rtas.h>
  30 #include <asm/time.h>
  31 #include <asm/prom.h>
  32 #include <asm/vdso_datapage.h>
  33 #include <asm/vio.h>
  34 #include <asm/mmu.h>
  35 #include <asm/machdep.h>
  36 #include <asm/drmem.h>
  37 
  38 #include "pseries.h"
  39 
  40 /*
  41  * This isn't a module but we expose that to userspace
  42  * via /proc so leave the definitions here
  43  */
  44 #define MODULE_VERS "1.9"
  45 #define MODULE_NAME "lparcfg"
  46 
  47 /* #define LPARCFG_DEBUG */
  48 
  49 /*
  50  * Track sum of all purrs across all processors. This is used to further
  51  * calculate usage values by different applications
  52  */
  53 static void cpu_get_purr(void *arg)
  54 {
  55         atomic64_t *sum = arg;
  56 
  57         atomic64_add(mfspr(SPRN_PURR), sum);
  58 }
  59 
  60 static unsigned long get_purr(void)
  61 {
  62         atomic64_t purr = ATOMIC64_INIT(0);
  63 
  64         on_each_cpu(cpu_get_purr, &purr, 1);
  65 
  66         return atomic64_read(&purr);
  67 }
  68 
  69 /*
  70  * Methods used to fetch LPAR data when running on a pSeries platform.
  71  */
  72 
  73 struct hvcall_ppp_data {
  74         u64     entitlement;
  75         u64     unallocated_entitlement;
  76         u16     group_num;
  77         u16     pool_num;
  78         u8      capped;
  79         u8      weight;
  80         u8      unallocated_weight;
  81         u16     active_procs_in_pool;
  82         u16     active_system_procs;
  83         u16     phys_platform_procs;
  84         u32     max_proc_cap_avail;
  85         u32     entitled_proc_cap_avail;
  86 };
  87 
  88 /*
  89  * H_GET_PPP hcall returns info in 4 parms.
  90  *  entitled_capacity,unallocated_capacity,
  91  *  aggregation, resource_capability).
  92  *
  93  *  R4 = Entitled Processor Capacity Percentage.
  94  *  R5 = Unallocated Processor Capacity Percentage.
  95  *  R6 (AABBCCDDEEFFGGHH).
  96  *      XXXX - reserved (0)
  97  *          XXXX - reserved (0)
  98  *              XXXX - Group Number
  99  *                  XXXX - Pool Number.
 100  *  R7 (IIJJKKLLMMNNOOPP).
 101  *      XX - reserved. (0)
 102  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 103  *          XX - variable processor Capacity Weight
 104  *            XX - Unallocated Variable Processor Capacity Weight.
 105  *              XXXX - Active processors in Physical Processor Pool.
 106  *                  XXXX  - Processors active on platform.
 107  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
 108  *      XXXX - Physical platform procs allocated to virtualization.
 109  *          XXXXXX - Max procs capacity % available to the partitions pool.
 110  *                XXXXXX - Entitled procs capacity % available to the
 111  *                         partitions pool.
 112  */
 113 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 114 {
 115         unsigned long rc;
 116         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 117 
 118         rc = plpar_hcall9(H_GET_PPP, retbuf);
 119 
 120         ppp_data->entitlement = retbuf[0];
 121         ppp_data->unallocated_entitlement = retbuf[1];
 122 
 123         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 124         ppp_data->pool_num = retbuf[2] & 0xffff;
 125 
 126         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 127         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 128         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 129         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 130         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 131 
 132         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
 133         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
 134         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
 135 
 136         return rc;
 137 }
 138 
 139 static unsigned h_pic(unsigned long *pool_idle_time,
 140                       unsigned long *num_procs)
 141 {
 142         unsigned long rc;
 143         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 144 
 145         rc = plpar_hcall(H_PIC, retbuf);
 146 
 147         *pool_idle_time = retbuf[0];
 148         *num_procs = retbuf[1];
 149 
 150         return rc;
 151 }
 152 
 153 /*
 154  * parse_ppp_data
 155  * Parse out the data returned from h_get_ppp and h_pic
 156  */
 157 static void parse_ppp_data(struct seq_file *m)
 158 {
 159         struct hvcall_ppp_data ppp_data;
 160         struct device_node *root;
 161         const __be32 *perf_level;
 162         int rc;
 163 
 164         rc = h_get_ppp(&ppp_data);
 165         if (rc)
 166                 return;
 167 
 168         seq_printf(m, "partition_entitled_capacity=%lld\n",
 169                    ppp_data.entitlement);
 170         seq_printf(m, "group=%d\n", ppp_data.group_num);
 171         seq_printf(m, "system_active_processors=%d\n",
 172                    ppp_data.active_system_procs);
 173 
 174         /* pool related entries are appropriate for shared configs */
 175         if (lppaca_shared_proc(get_lppaca())) {
 176                 unsigned long pool_idle_time, pool_procs;
 177 
 178                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 179 
 180                 /* report pool_capacity in percentage */
 181                 seq_printf(m, "pool_capacity=%d\n",
 182                            ppp_data.active_procs_in_pool * 100);
 183 
 184                 h_pic(&pool_idle_time, &pool_procs);
 185                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 186                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 187         }
 188 
 189         seq_printf(m, "unallocated_capacity_weight=%d\n",
 190                    ppp_data.unallocated_weight);
 191         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 192         seq_printf(m, "capped=%d\n", ppp_data.capped);
 193         seq_printf(m, "unallocated_capacity=%lld\n",
 194                    ppp_data.unallocated_entitlement);
 195 
 196         /* The last bits of information returned from h_get_ppp are only
 197          * valid if the ibm,partition-performance-parameters-level
 198          * property is >= 1.
 199          */
 200         root = of_find_node_by_path("/");
 201         if (root) {
 202                 perf_level = of_get_property(root,
 203                                 "ibm,partition-performance-parameters-level",
 204                                              NULL);
 205                 if (perf_level && (be32_to_cpup(perf_level) >= 1)) {
 206                         seq_printf(m,
 207                             "physical_procs_allocated_to_virtualization=%d\n",
 208                                    ppp_data.phys_platform_procs);
 209                         seq_printf(m, "max_proc_capacity_available=%d\n",
 210                                    ppp_data.max_proc_cap_avail);
 211                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 212                                    ppp_data.entitled_proc_cap_avail);
 213                 }
 214 
 215                 of_node_put(root);
 216         }
 217 }
 218 
 219 /**
 220  * parse_mpp_data
 221  * Parse out data returned from h_get_mpp
 222  */
 223 static void parse_mpp_data(struct seq_file *m)
 224 {
 225         struct hvcall_mpp_data mpp_data;
 226         int rc;
 227 
 228         rc = h_get_mpp(&mpp_data);
 229         if (rc)
 230                 return;
 231 
 232         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 233 
 234         if (mpp_data.mapped_mem != -1)
 235                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 236                            mpp_data.mapped_mem);
 237 
 238         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 239         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 240 
 241         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 242         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 243                    mpp_data.unallocated_mem_weight);
 244         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 245                    mpp_data.unallocated_entitlement);
 246 
 247         if (mpp_data.pool_size != -1)
 248                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 249                            mpp_data.pool_size);
 250 
 251         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 252                    mpp_data.loan_request);
 253 
 254         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 255 }
 256 
 257 /**
 258  * parse_mpp_x_data
 259  * Parse out data returned from h_get_mpp_x
 260  */
 261 static void parse_mpp_x_data(struct seq_file *m)
 262 {
 263         struct hvcall_mpp_x_data mpp_x_data;
 264 
 265         if (!firmware_has_feature(FW_FEATURE_XCMO))
 266                 return;
 267         if (h_get_mpp_x(&mpp_x_data))
 268                 return;
 269 
 270         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
 271 
 272         if (mpp_x_data.pool_coalesced_bytes)
 273                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
 274                            mpp_x_data.pool_coalesced_bytes);
 275         if (mpp_x_data.pool_purr_cycles)
 276                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
 277         if (mpp_x_data.pool_spurr_cycles)
 278                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
 279 }
 280 
 281 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 282 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 283 
 284 /*
 285  * parse_system_parameter_string()
 286  * Retrieve the potential_processors, max_entitled_capacity and friends
 287  * through the get-system-parameter rtas call.  Replace keyword strings as
 288  * necessary.
 289  */
 290 static void parse_system_parameter_string(struct seq_file *m)
 291 {
 292         int call_status;
 293 
 294         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 295         if (!local_buffer) {
 296                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 297                        __FILE__, __func__, __LINE__);
 298                 return;
 299         }
 300 
 301         spin_lock(&rtas_data_buf_lock);
 302         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 303         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 304                                 NULL,
 305                                 SPLPAR_CHARACTERISTICS_TOKEN,
 306                                 __pa(rtas_data_buf),
 307                                 RTAS_DATA_BUF_SIZE);
 308         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 309         local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
 310         spin_unlock(&rtas_data_buf_lock);
 311 
 312         if (call_status != 0) {
 313                 printk(KERN_INFO
 314                        "%s %s Error calling get-system-parameter (0x%x)\n",
 315                        __FILE__, __func__, call_status);
 316         } else {
 317                 int splpar_strlen;
 318                 int idx, w_idx;
 319                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 320                 if (!workbuffer) {
 321                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 322                                __FILE__, __func__, __LINE__);
 323                         kfree(local_buffer);
 324                         return;
 325                 }
 326 #ifdef LPARCFG_DEBUG
 327                 printk(KERN_INFO "success calling get-system-parameter\n");
 328 #endif
 329                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 330                 local_buffer += 2;      /* step over strlen value */
 331 
 332                 w_idx = 0;
 333                 idx = 0;
 334                 while ((*local_buffer) && (idx < splpar_strlen)) {
 335                         workbuffer[w_idx++] = local_buffer[idx++];
 336                         if ((local_buffer[idx] == ',')
 337                             || (local_buffer[idx] == '\0')) {
 338                                 workbuffer[w_idx] = '\0';
 339                                 if (w_idx) {
 340                                         /* avoid the empty string */
 341                                         seq_printf(m, "%s\n", workbuffer);
 342                                 }
 343                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 344                                 idx++;  /* skip the comma */
 345                                 w_idx = 0;
 346                         } else if (local_buffer[idx] == '=') {
 347                                 /* code here to replace workbuffer contents
 348                                    with different keyword strings */
 349                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 350                                         strcpy(workbuffer,
 351                                                "partition_max_entitled_capacity");
 352                                         w_idx = strlen(workbuffer);
 353                                 }
 354                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 355                                         strcpy(workbuffer,
 356                                                "system_potential_processors");
 357                                         w_idx = strlen(workbuffer);
 358                                 }
 359                         }
 360                 }
 361                 kfree(workbuffer);
 362                 local_buffer -= 2;      /* back up over strlen value */
 363         }
 364         kfree(local_buffer);
 365 }
 366 
 367 /* Return the number of processors in the system.
 368  * This function reads through the device tree and counts
 369  * the virtual processors, this does not include threads.
 370  */
 371 static int lparcfg_count_active_processors(void)
 372 {
 373         struct device_node *cpus_dn;
 374         int count = 0;
 375 
 376         for_each_node_by_type(cpus_dn, "cpu") {
 377 #ifdef LPARCFG_DEBUG
 378                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
 379 #endif
 380                 count++;
 381         }
 382         return count;
 383 }
 384 
 385 static void pseries_cmo_data(struct seq_file *m)
 386 {
 387         int cpu;
 388         unsigned long cmo_faults = 0;
 389         unsigned long cmo_fault_time = 0;
 390 
 391         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 392 
 393         if (!firmware_has_feature(FW_FEATURE_CMO))
 394                 return;
 395 
 396         for_each_possible_cpu(cpu) {
 397                 cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
 398                 cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
 399         }
 400 
 401         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 402         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 403                    cmo_fault_time / tb_ticks_per_usec);
 404         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 405         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 406         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 407 }
 408 
 409 static void splpar_dispatch_data(struct seq_file *m)
 410 {
 411         int cpu;
 412         unsigned long dispatches = 0;
 413         unsigned long dispatch_dispersions = 0;
 414 
 415         for_each_possible_cpu(cpu) {
 416                 dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
 417                 dispatch_dispersions +=
 418                         be32_to_cpu(lppaca_of(cpu).dispersion_count);
 419         }
 420 
 421         seq_printf(m, "dispatches=%lu\n", dispatches);
 422         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 423 }
 424 
 425 static void parse_em_data(struct seq_file *m)
 426 {
 427         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 428 
 429         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 430             plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
 431                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
 432 }
 433 
 434 static void maxmem_data(struct seq_file *m)
 435 {
 436         unsigned long maxmem = 0;
 437 
 438         maxmem += (unsigned long)drmem_info->n_lmbs * drmem_info->lmb_size;
 439         maxmem += hugetlb_total_pages() * PAGE_SIZE;
 440 
 441         seq_printf(m, "MaxMem=%lu\n", maxmem);
 442 }
 443 
 444 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 445 {
 446         int partition_potential_processors;
 447         int partition_active_processors;
 448         struct device_node *rtas_node;
 449         const __be32 *lrdrp = NULL;
 450 
 451         rtas_node = of_find_node_by_path("/rtas");
 452         if (rtas_node)
 453                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 454 
 455         if (lrdrp == NULL) {
 456                 partition_potential_processors = vdso_data->processorCount;
 457         } else {
 458                 partition_potential_processors = be32_to_cpup(lrdrp + 4);
 459         }
 460         of_node_put(rtas_node);
 461 
 462         partition_active_processors = lparcfg_count_active_processors();
 463 
 464         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 465                 /* this call handles the ibm,get-system-parameter contents */
 466                 parse_system_parameter_string(m);
 467                 parse_ppp_data(m);
 468                 parse_mpp_data(m);
 469                 parse_mpp_x_data(m);
 470                 pseries_cmo_data(m);
 471                 splpar_dispatch_data(m);
 472 
 473                 seq_printf(m, "purr=%ld\n", get_purr());
 474                 seq_printf(m, "tbr=%ld\n", mftb());
 475         } else {                /* non SPLPAR case */
 476 
 477                 seq_printf(m, "system_active_processors=%d\n",
 478                            partition_potential_processors);
 479 
 480                 seq_printf(m, "system_potential_processors=%d\n",
 481                            partition_potential_processors);
 482 
 483                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 484                            partition_potential_processors * 100);
 485 
 486                 seq_printf(m, "partition_entitled_capacity=%d\n",
 487                            partition_active_processors * 100);
 488         }
 489 
 490         seq_printf(m, "partition_active_processors=%d\n",
 491                    partition_active_processors);
 492 
 493         seq_printf(m, "partition_potential_processors=%d\n",
 494                    partition_potential_processors);
 495 
 496         seq_printf(m, "shared_processor_mode=%d\n",
 497                    lppaca_shared_proc(get_lppaca()));
 498 
 499 #ifdef CONFIG_PPC_BOOK3S_64
 500         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 501 #endif
 502         parse_em_data(m);
 503         maxmem_data(m);
 504 
 505         return 0;
 506 }
 507 
 508 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 509 {
 510         struct hvcall_ppp_data ppp_data;
 511         u8 new_weight;
 512         u64 new_entitled;
 513         ssize_t retval;
 514 
 515         /* Get our current parameters */
 516         retval = h_get_ppp(&ppp_data);
 517         if (retval)
 518                 return retval;
 519 
 520         if (entitlement) {
 521                 new_weight = ppp_data.weight;
 522                 new_entitled = *entitlement;
 523         } else if (weight) {
 524                 new_weight = *weight;
 525                 new_entitled = ppp_data.entitlement;
 526         } else
 527                 return -EINVAL;
 528 
 529         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 530                  __func__, ppp_data.entitlement, ppp_data.weight);
 531 
 532         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 533                  __func__, new_entitled, new_weight);
 534 
 535         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 536         return retval;
 537 }
 538 
 539 /**
 540  * update_mpp
 541  *
 542  * Update the memory entitlement and weight for the partition.  Caller must
 543  * specify either a new entitlement or weight, not both, to be updated
 544  * since the h_set_mpp call takes both entitlement and weight as parameters.
 545  */
 546 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 547 {
 548         struct hvcall_mpp_data mpp_data;
 549         u64 new_entitled;
 550         u8 new_weight;
 551         ssize_t rc;
 552 
 553         if (entitlement) {
 554                 /* Check with vio to ensure the new memory entitlement
 555                  * can be handled.
 556                  */
 557                 rc = vio_cmo_entitlement_update(*entitlement);
 558                 if (rc)
 559                         return rc;
 560         }
 561 
 562         rc = h_get_mpp(&mpp_data);
 563         if (rc)
 564                 return rc;
 565 
 566         if (entitlement) {
 567                 new_weight = mpp_data.mem_weight;
 568                 new_entitled = *entitlement;
 569         } else if (weight) {
 570                 new_weight = *weight;
 571                 new_entitled = mpp_data.entitled_mem;
 572         } else
 573                 return -EINVAL;
 574 
 575         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 576                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 577 
 578         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 579                  __func__, new_entitled, new_weight);
 580 
 581         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 582         return rc;
 583 }
 584 
 585 /*
 586  * Interface for changing system parameters (variable capacity weight
 587  * and entitled capacity).  Format of input is "param_name=value";
 588  * anything after value is ignored.  Valid parameters at this time are
 589  * "partition_entitled_capacity" and "capacity_weight".  We use
 590  * H_SET_PPP to alter parameters.
 591  *
 592  * This function should be invoked only on systems with
 593  * FW_FEATURE_SPLPAR.
 594  */
 595 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 596                              size_t count, loff_t * off)
 597 {
 598         char kbuf[64];
 599         char *tmp;
 600         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 601         u8 new_weight, *new_weight_ptr = &new_weight;
 602         ssize_t retval;
 603 
 604         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 605                 return -EINVAL;
 606 
 607         if (count > sizeof(kbuf))
 608                 return -EINVAL;
 609 
 610         if (copy_from_user(kbuf, buf, count))
 611                 return -EFAULT;
 612 
 613         kbuf[count - 1] = '\0';
 614         tmp = strchr(kbuf, '=');
 615         if (!tmp)
 616                 return -EINVAL;
 617 
 618         *tmp++ = '\0';
 619 
 620         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 621                 char *endp;
 622                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 623                 if (endp == tmp)
 624                         return -EINVAL;
 625 
 626                 retval = update_ppp(new_entitled_ptr, NULL);
 627         } else if (!strcmp(kbuf, "capacity_weight")) {
 628                 char *endp;
 629                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 630                 if (endp == tmp)
 631                         return -EINVAL;
 632 
 633                 retval = update_ppp(NULL, new_weight_ptr);
 634         } else if (!strcmp(kbuf, "entitled_memory")) {
 635                 char *endp;
 636                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 637                 if (endp == tmp)
 638                         return -EINVAL;
 639 
 640                 retval = update_mpp(new_entitled_ptr, NULL);
 641         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 642                 char *endp;
 643                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 644                 if (endp == tmp)
 645                         return -EINVAL;
 646 
 647                 retval = update_mpp(NULL, new_weight_ptr);
 648         } else
 649                 return -EINVAL;
 650 
 651         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 652                 retval = count;
 653         } else if (retval == H_BUSY) {
 654                 retval = -EBUSY;
 655         } else if (retval == H_HARDWARE) {
 656                 retval = -EIO;
 657         } else if (retval == H_PARAMETER) {
 658                 retval = -EINVAL;
 659         }
 660 
 661         return retval;
 662 }
 663 
 664 static int lparcfg_data(struct seq_file *m, void *v)
 665 {
 666         struct device_node *rootdn;
 667         const char *model = "";
 668         const char *system_id = "";
 669         const char *tmp;
 670         const __be32 *lp_index_ptr;
 671         unsigned int lp_index = 0;
 672 
 673         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
 674 
 675         rootdn = of_find_node_by_path("/");
 676         if (rootdn) {
 677                 tmp = of_get_property(rootdn, "model", NULL);
 678                 if (tmp)
 679                         model = tmp;
 680                 tmp = of_get_property(rootdn, "system-id", NULL);
 681                 if (tmp)
 682                         system_id = tmp;
 683                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 684                                         NULL);
 685                 if (lp_index_ptr)
 686                         lp_index = be32_to_cpup(lp_index_ptr);
 687                 of_node_put(rootdn);
 688         }
 689         seq_printf(m, "serial_number=%s\n", system_id);
 690         seq_printf(m, "system_type=%s\n", model);
 691         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 692 
 693         return pseries_lparcfg_data(m, v);
 694 }
 695 
 696 static int lparcfg_open(struct inode *inode, struct file *file)
 697 {
 698         return single_open(file, lparcfg_data, NULL);
 699 }
 700 
 701 static const struct file_operations lparcfg_fops = {
 702         .read           = seq_read,
 703         .write          = lparcfg_write,
 704         .open           = lparcfg_open,
 705         .release        = single_release,
 706         .llseek         = seq_lseek,
 707 };
 708 
 709 static int __init lparcfg_init(void)
 710 {
 711         umode_t mode = 0444;
 712 
 713         /* Allow writing if we have FW_FEATURE_SPLPAR */
 714         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 715                 mode |= 0200;
 716 
 717         if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops)) {
 718                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
 719                 return -EIO;
 720         }
 721         return 0;
 722 }
 723 machine_device_initcall(pseries, lparcfg_init);