arch/powerpc/platforms/pseries/lparcfg.c

   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 void show_gpci_data(struct seq_file *m)
 140 {
 141         struct hv_gpci_request_buffer *buf;
 142         unsigned int affinity_score;
 143         long ret;
 144
 145         buf = kmalloc(sizeof(*buf), GFP_KERNEL);
 146         if (buf == NULL)
 147                 return;
 148
 149         /*
 150          * Show the local LPAR's affinity score.
 151          *
 152          * 0xB1 selects the Affinity_Domain_Info_By_Partition subcall.
 153          * The score is at byte 0xB in the output buffer.
 154          */
 155         memset(&buf->params, 0, sizeof(buf->params));
 156         buf->params.counter_request = cpu_to_be32(0xB1);
 157         buf->params.starting_index = cpu_to_be32(-1);   /* local LPAR */
 158         buf->params.counter_info_version_in = 0x5;      /* v5+ for score */
 159         ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO, virt_to_phys(buf),
 160                                  sizeof(*buf));
 161         if (ret != H_SUCCESS) {
 162                 pr_debug("hcall failed: H_GET_PERF_COUNTER_INFO: %ld, %x\n",
 163                          ret, be32_to_cpu(buf->params.detail_rc));
 164                 goto out;
 165         }
 166         affinity_score = buf->bytes[0xB];
 167         seq_printf(m, "partition_affinity_score=%u\n", affinity_score);
 168 out:
 169         kfree(buf);
 170 }
 171
 172 static unsigned h_pic(unsigned long *pool_idle_time,
 173                       unsigned long *num_procs)
 174 {
 175         unsigned long rc;
 176         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 177
 178         rc = plpar_hcall(H_PIC, retbuf);
 179
 180         *pool_idle_time = retbuf[0];
 181         *num_procs = retbuf[1];
 182
 183         return rc;
 184 }
 185
 186 /*
 187  * parse_ppp_data
 188  * Parse out the data returned from h_get_ppp and h_pic
 189  */
 190 static void parse_ppp_data(struct seq_file *m)
 191 {
 192         struct hvcall_ppp_data ppp_data;
 193         struct device_node *root;
 194         const __be32 *perf_level;
 195         int rc;
 196
 197         rc = h_get_ppp(&ppp_data);
 198         if (rc)
 199                 return;
 200
 201         seq_printf(m, "partition_entitled_capacity=%lld\n",
 202                    ppp_data.entitlement);
 203         seq_printf(m, "group=%d\n", ppp_data.group_num);
 204         seq_printf(m, "system_active_processors=%d\n",
 205                    ppp_data.active_system_procs);
 206
 207         /* pool related entries are appropriate for shared configs */
 208         if (lppaca_shared_proc(get_lppaca())) {
 209                 unsigned long pool_idle_time, pool_procs;
 210
 211                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 212
 213                 /* report pool_capacity in percentage */
 214                 seq_printf(m, "pool_capacity=%d\n",
 215                            ppp_data.active_procs_in_pool * 100);
 216
 217                 h_pic(&pool_idle_time, &pool_procs);
 218                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 219                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 220         }
 221
 222         seq_printf(m, "unallocated_capacity_weight=%d\n",
 223                    ppp_data.unallocated_weight);
 224         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 225         seq_printf(m, "capped=%d\n", ppp_data.capped);
 226         seq_printf(m, "unallocated_capacity=%lld\n",
 227                    ppp_data.unallocated_entitlement);
 228
 229         /* The last bits of information returned from h_get_ppp are only
 230          * valid if the ibm,partition-performance-parameters-level
 231          * property is >= 1.
 232          */
 233         root = of_find_node_by_path("/");
 234         if (root) {
 235                 perf_level = of_get_property(root,
 236                                 "ibm,partition-performance-parameters-level",
 237                                              NULL);
 238                 if (perf_level && (be32_to_cpup(perf_level) >= 1)) {
 239                         seq_printf(m,
 240                             "physical_procs_allocated_to_virtualization=%d\n",
 241                                    ppp_data.phys_platform_procs);
 242                         seq_printf(m, "max_proc_capacity_available=%d\n",
 243                                    ppp_data.max_proc_cap_avail);
 244                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 245                                    ppp_data.entitled_proc_cap_avail);
 246                 }
 247
 248                 of_node_put(root);
 249         }
 250 }
 251
 252 /**
 253  * parse_mpp_data
 254  * Parse out data returned from h_get_mpp
 255  */
 256 static void parse_mpp_data(struct seq_file *m)
 257 {
 258         struct hvcall_mpp_data mpp_data;
 259         int rc;
 260
 261         rc = h_get_mpp(&mpp_data);
 262         if (rc)
 263                 return;
 264
 265         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 266
 267         if (mpp_data.mapped_mem != -1)
 268                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 269                            mpp_data.mapped_mem);
 270
 271         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 272         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 273
 274         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 275         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 276                    mpp_data.unallocated_mem_weight);
 277         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 278                    mpp_data.unallocated_entitlement);
 279
 280         if (mpp_data.pool_size != -1)
 281                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 282                            mpp_data.pool_size);
 283
 284         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 285                    mpp_data.loan_request);
 286
 287         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 288 }
 289
 290 /**
 291  * parse_mpp_x_data
 292  * Parse out data returned from h_get_mpp_x
 293  */
 294 static void parse_mpp_x_data(struct seq_file *m)
 295 {
 296         struct hvcall_mpp_x_data mpp_x_data;
 297
 298         if (!firmware_has_feature(FW_FEATURE_XCMO))
 299                 return;
 300         if (h_get_mpp_x(&mpp_x_data))
 301                 return;
 302
 303         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
 304
 305         if (mpp_x_data.pool_coalesced_bytes)
 306                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
 307                            mpp_x_data.pool_coalesced_bytes);
 308         if (mpp_x_data.pool_purr_cycles)
 309                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
 310         if (mpp_x_data.pool_spurr_cycles)
 311                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
 312 }
 313
 314 #define SPLPAR_CHARACTERISTICS_TOKEN 20
 315 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 316
 317 /*
 318  * parse_system_parameter_string()
 319  * Retrieve the potential_processors, max_entitled_capacity and friends
 320  * through the get-system-parameter rtas call.  Replace keyword strings as
 321  * necessary.
 322  */
 323 static void parse_system_parameter_string(struct seq_file *m)
 324 {
 325         int call_status;
 326
 327         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 328         if (!local_buffer) {
 329                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 330                        __FILE__, __func__, __LINE__);
 331                 return;
 332         }
 333
 334         spin_lock(&rtas_data_buf_lock);
 335         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
 336         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 337                                 NULL,
 338                                 SPLPAR_CHARACTERISTICS_TOKEN,
 339                                 __pa(rtas_data_buf),
 340                                 RTAS_DATA_BUF_SIZE);
 341         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
 342         local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
 343         spin_unlock(&rtas_data_buf_lock);
 344
 345         if (call_status != 0) {
 346                 printk(KERN_INFO
 347                        "%s %s Error calling get-system-parameter (0x%x)\n",
 348                        __FILE__, __func__, call_status);
 349         } else {
 350                 int splpar_strlen;
 351                 int idx, w_idx;
 352                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 353                 if (!workbuffer) {
 354                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
 355                                __FILE__, __func__, __LINE__);
 356                         kfree(local_buffer);
 357                         return;
 358                 }
 359 #ifdef LPARCFG_DEBUG
 360                 printk(KERN_INFO "success calling get-system-parameter\n");
 361 #endif
 362                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
 363                 local_buffer += 2;      /* step over strlen value */
 364
 365                 w_idx = 0;
 366                 idx = 0;
 367                 while ((*local_buffer) && (idx < splpar_strlen)) {
 368                         workbuffer[w_idx++] = local_buffer[idx++];
 369                         if ((local_buffer[idx] == ',')
 370                             || (local_buffer[idx] == '\0')) {
 371                                 workbuffer[w_idx] = '\0';
 372                                 if (w_idx) {
 373                                         /* avoid the empty string */
 374                                         seq_printf(m, "%s\n", workbuffer);
 375                                 }
 376                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 377                                 idx++;  /* skip the comma */
 378                                 w_idx = 0;
 379                         } else if (local_buffer[idx] == '=') {
 380                                 /* code here to replace workbuffer contents
 381                                    with different keyword strings */
 382                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 383                                         strcpy(workbuffer,
 384                                                "partition_max_entitled_capacity");
 385                                         w_idx = strlen(workbuffer);
 386                                 }
 387                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 388                                         strcpy(workbuffer,
 389                                                "system_potential_processors");
 390                                         w_idx = strlen(workbuffer);
 391                                 }
 392                         }
 393                 }
 394                 kfree(workbuffer);
 395                 local_buffer -= 2;      /* back up over strlen value */
 396         }
 397         kfree(local_buffer);
 398 }
 399
 400 /* Return the number of processors in the system.
 401  * This function reads through the device tree and counts
 402  * the virtual processors, this does not include threads.
 403  */
 404 static int lparcfg_count_active_processors(void)
 405 {
 406         struct device_node *cpus_dn;
 407         int count = 0;
 408
 409         for_each_node_by_type(cpus_dn, "cpu") {
 410 #ifdef LPARCFG_DEBUG
 411                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
 412 #endif
 413                 count++;
 414         }
 415         return count;
 416 }
 417
 418 static void pseries_cmo_data(struct seq_file *m)
 419 {
 420         int cpu;
 421         unsigned long cmo_faults = 0;
 422         unsigned long cmo_fault_time = 0;
 423
 424         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 425
 426         if (!firmware_has_feature(FW_FEATURE_CMO))
 427                 return;
 428
 429         for_each_possible_cpu(cpu) {
 430                 cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
 431                 cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
 432         }
 433
 434         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 435         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 436                    cmo_fault_time / tb_ticks_per_usec);
 437         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 438         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 439         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 440 }
 441
 442 static void splpar_dispatch_data(struct seq_file *m)
 443 {
 444         int cpu;
 445         unsigned long dispatches = 0;
 446         unsigned long dispatch_dispersions = 0;
 447
 448         for_each_possible_cpu(cpu) {
 449                 dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
 450                 dispatch_dispersions +=
 451                         be32_to_cpu(lppaca_of(cpu).dispersion_count);
 452         }
 453
 454         seq_printf(m, "dispatches=%lu\n", dispatches);
 455         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 456 }
 457
 458 static void parse_em_data(struct seq_file *m)
 459 {
 460         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 461
 462         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 463             plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
 464                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
 465 }
 466
 467 static void maxmem_data(struct seq_file *m)
 468 {
 469         unsigned long maxmem = 0;
 470
 471         maxmem += (unsigned long)drmem_info->n_lmbs * drmem_info->lmb_size;
 472         maxmem += hugetlb_total_pages() * PAGE_SIZE;
 473
 474         seq_printf(m, "MaxMem=%lu\n", maxmem);
 475 }
 476
 477 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 478 {
 479         int partition_potential_processors;
 480         int partition_active_processors;
 481         struct device_node *rtas_node;
 482         const __be32 *lrdrp = NULL;
 483
 484         rtas_node = of_find_node_by_path("/rtas");
 485         if (rtas_node)
 486                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 487
 488         if (lrdrp == NULL) {
 489                 partition_potential_processors = vdso_data->processorCount;
 490         } else {
 491                 partition_potential_processors = be32_to_cpup(lrdrp + 4);
 492         }
 493         of_node_put(rtas_node);
 494
 495         partition_active_processors = lparcfg_count_active_processors();
 496
 497         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 498                 /* this call handles the ibm,get-system-parameter contents */
 499                 parse_system_parameter_string(m);
 500                 parse_ppp_data(m);
 501                 parse_mpp_data(m);
 502                 parse_mpp_x_data(m);
 503                 pseries_cmo_data(m);
 504                 splpar_dispatch_data(m);
 505
 506                 seq_printf(m, "purr=%ld\n", get_purr());
 507                 seq_printf(m, "tbr=%ld\n", mftb());
 508         } else {                /* non SPLPAR case */
 509
 510                 seq_printf(m, "system_active_processors=%d\n",
 511                            partition_potential_processors);
 512
 513                 seq_printf(m, "system_potential_processors=%d\n",
 514                            partition_potential_processors);
 515
 516                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 517                            partition_potential_processors * 100);
 518
 519                 seq_printf(m, "partition_entitled_capacity=%d\n",
 520                            partition_active_processors * 100);
 521         }
 522
 523         show_gpci_data(m);
 524
 525         seq_printf(m, "partition_active_processors=%d\n",
 526                    partition_active_processors);
 527
 528         seq_printf(m, "partition_potential_processors=%d\n",
 529                    partition_potential_processors);
 530
 531         seq_printf(m, "shared_processor_mode=%d\n",
 532                    lppaca_shared_proc(get_lppaca()));
 533
 534 #ifdef CONFIG_PPC_BOOK3S_64
 535         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 536 #endif
 537         parse_em_data(m);
 538         maxmem_data(m);
 539
 540         seq_printf(m, "security_flavor=%u\n", pseries_security_flavor);
 541
 542         return 0;
 543 }
 544
 545 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 546 {
 547         struct hvcall_ppp_data ppp_data;
 548         u8 new_weight;
 549         u64 new_entitled;
 550         ssize_t retval;
 551
 552         /* Get our current parameters */
 553         retval = h_get_ppp(&ppp_data);
 554         if (retval)
 555                 return retval;
 556
 557         if (entitlement) {
 558                 new_weight = ppp_data.weight;
 559                 new_entitled = *entitlement;
 560         } else if (weight) {
 561                 new_weight = *weight;
 562                 new_entitled = ppp_data.entitlement;
 563         } else
 564                 return -EINVAL;
 565
 566         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 567                  __func__, ppp_data.entitlement, ppp_data.weight);
 568
 569         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 570                  __func__, new_entitled, new_weight);
 571
 572         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 573         return retval;
 574 }
 575
 576 /**
 577  * update_mpp
 578  *
 579  * Update the memory entitlement and weight for the partition.  Caller must
 580  * specify either a new entitlement or weight, not both, to be updated
 581  * since the h_set_mpp call takes both entitlement and weight as parameters.
 582  */
 583 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 584 {
 585         struct hvcall_mpp_data mpp_data;
 586         u64 new_entitled;
 587         u8 new_weight;
 588         ssize_t rc;
 589
 590         if (entitlement) {
 591                 /* Check with vio to ensure the new memory entitlement
 592                  * can be handled.
 593                  */
 594                 rc = vio_cmo_entitlement_update(*entitlement);
 595                 if (rc)
 596                         return rc;
 597         }
 598
 599         rc = h_get_mpp(&mpp_data);
 600         if (rc)
 601                 return rc;
 602
 603         if (entitlement) {
 604                 new_weight = mpp_data.mem_weight;
 605                 new_entitled = *entitlement;
 606         } else if (weight) {
 607                 new_weight = *weight;
 608                 new_entitled = mpp_data.entitled_mem;
 609         } else
 610                 return -EINVAL;
 611
 612         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 613                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 614
 615         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 616                  __func__, new_entitled, new_weight);
 617
 618         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 619         return rc;
 620 }
 621
 622 /*
 623  * Interface for changing system parameters (variable capacity weight
 624  * and entitled capacity).  Format of input is "param_name=value";
 625  * anything after value is ignored.  Valid parameters at this time are
 626  * "partition_entitled_capacity" and "capacity_weight".  We use
 627  * H_SET_PPP to alter parameters.
 628  *
 629  * This function should be invoked only on systems with
 630  * FW_FEATURE_SPLPAR.
 631  */
 632 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 633                              size_t count, loff_t * off)
 634 {
 635         char kbuf[64];
 636         char *tmp;
 637         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 638         u8 new_weight, *new_weight_ptr = &new_weight;
 639         ssize_t retval;
 640
 641         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 642                 return -EINVAL;
 643
 644         if (count > sizeof(kbuf))
 645                 return -EINVAL;
 646
 647         if (copy_from_user(kbuf, buf, count))
 648                 return -EFAULT;
 649
 650         kbuf[count - 1] = '\0';
 651         tmp = strchr(kbuf, '=');
 652         if (!tmp)
 653                 return -EINVAL;
 654
 655         *tmp++ = '\0';
 656
 657         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 658                 char *endp;
 659                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 660                 if (endp == tmp)
 661                         return -EINVAL;
 662
 663                 retval = update_ppp(new_entitled_ptr, NULL);
 664         } else if (!strcmp(kbuf, "capacity_weight")) {
 665                 char *endp;
 666                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 667                 if (endp == tmp)
 668                         return -EINVAL;
 669
 670                 retval = update_ppp(NULL, new_weight_ptr);
 671         } else if (!strcmp(kbuf, "entitled_memory")) {
 672                 char *endp;
 673                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 674                 if (endp == tmp)
 675                         return -EINVAL;
 676
 677                 retval = update_mpp(new_entitled_ptr, NULL);
 678         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 679                 char *endp;
 680                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 681                 if (endp == tmp)
 682                         return -EINVAL;
 683
 684                 retval = update_mpp(NULL, new_weight_ptr);
 685         } else
 686                 return -EINVAL;
 687
 688         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 689                 retval = count;
 690         } else if (retval == H_BUSY) {
 691                 retval = -EBUSY;
 692         } else if (retval == H_HARDWARE) {
 693                 retval = -EIO;
 694         } else if (retval == H_PARAMETER) {
 695                 retval = -EINVAL;
 696         }
 697
 698         return retval;
 699 }
 700
 701 static int lparcfg_data(struct seq_file *m, void *v)
 702 {
 703         struct device_node *rootdn;
 704         const char *model = "";
 705         const char *system_id = "";
 706         const char *tmp;
 707         const __be32 *lp_index_ptr;
 708         unsigned int lp_index = 0;
 709
 710         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
 711
 712         rootdn = of_find_node_by_path("/");
 713         if (rootdn) {
 714                 tmp = of_get_property(rootdn, "model", NULL);
 715                 if (tmp)
 716                         model = tmp;
 717                 tmp = of_get_property(rootdn, "system-id", NULL);
 718                 if (tmp)
 719                         system_id = tmp;
 720                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 721                                         NULL);
 722                 if (lp_index_ptr)
 723                         lp_index = be32_to_cpup(lp_index_ptr);
 724                 of_node_put(rootdn);
 725         }
 726         seq_printf(m, "serial_number=%s\n", system_id);
 727         seq_printf(m, "system_type=%s\n", model);
 728         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 729
 730         return pseries_lparcfg_data(m, v);
 731 }
 732
 733 static int lparcfg_open(struct inode *inode, struct file *file)
 734 {
 735         return single_open(file, lparcfg_data, NULL);
 736 }
 737
 738 static const struct proc_ops lparcfg_proc_ops = {
 739         .proc_read      = seq_read,
 740         .proc_write     = lparcfg_write,
 741         .proc_open      = lparcfg_open,
 742         .proc_release   = single_release,
 743         .proc_lseek     = seq_lseek,
 744 };
 745
 746 static int __init lparcfg_init(void)
 747 {
 748         umode_t mode = 0444;
 749
 750         /* Allow writing if we have FW_FEATURE_SPLPAR */
 751         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 752                 mode |= 0200;
 753
 754         if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_proc_ops)) {
 755                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
 756                 return -EIO;
 757         }
 758         return 0;
 759 }
 760 machine_device_initcall(pseries, lparcfg_init);