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 <asm/papr-sysparm.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/slab.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/hugetlb.h>
  27 #include <asm/lppaca.h>
  28 #include <asm/hvcall.h>
  29 #include <asm/firmware.h>
  30 #include <asm/rtas.h>
  31 #include <asm/time.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 #include "vas.h"        /* pseries_vas_dlpar_cpu() */
  40
  41 /*
  42  * This isn't a module but we expose that to userspace
  43  * via /proc so leave the definitions here
  44  */
  45 #define MODULE_VERS "1.9"
  46 #define MODULE_NAME "lparcfg"
  47
  48 /* #define LPARCFG_DEBUG */
  49
  50 /*
  51  * Track sum of all purrs across all processors. This is used to further
  52  * calculate usage values by different applications
  53  */
  54 static void cpu_get_purr(void *arg)
  55 {
  56         atomic64_t *sum = arg;
  57
  58         atomic64_add(mfspr(SPRN_PURR), sum);
  59 }
  60
  61 static unsigned long get_purr(void)
  62 {
  63         atomic64_t purr = ATOMIC64_INIT(0);
  64
  65         on_each_cpu(cpu_get_purr, &purr, 1);
  66
  67         return atomic64_read(&purr);
  68 }
  69
  70 /*
  71  * Methods used to fetch LPAR data when running on a pSeries platform.
  72  */
  73
  74 struct hvcall_ppp_data {
  75         u64     entitlement;
  76         u64     unallocated_entitlement;
  77         u16     group_num;
  78         u16     pool_num;
  79         u8      capped;
  80         u8      weight;
  81         u8      unallocated_weight;
  82         u16     active_procs_in_pool;
  83         u16     active_system_procs;
  84         u16     phys_platform_procs;
  85         u32     max_proc_cap_avail;
  86         u32     entitled_proc_cap_avail;
  87 };
  88
  89 /*
  90  * H_GET_PPP hcall returns info in 4 parms.
  91  *  entitled_capacity,unallocated_capacity,
  92  *  aggregation, resource_capability).
  93  *
  94  *  R4 = Entitled Processor Capacity Percentage.
  95  *  R5 = Unallocated Processor Capacity Percentage.
  96  *  R6 (AABBCCDDEEFFGGHH).
  97  *      XXXX - reserved (0)
  98  *          XXXX - reserved (0)
  99  *              XXXX - Group Number
 100  *                  XXXX - Pool Number.
 101  *  R7 (IIJJKKLLMMNNOOPP).
 102  *      XX - reserved. (0)
 103  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 104  *          XX - variable processor Capacity Weight
 105  *            XX - Unallocated Variable Processor Capacity Weight.
 106  *              XXXX - Active processors in Physical Processor Pool.
 107  *                  XXXX  - Processors active on platform.
 108  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
 109  *      XXXX - Physical platform procs allocated to virtualization.
 110  *          XXXXXX - Max procs capacity % available to the partitions pool.
 111  *                XXXXXX - Entitled procs capacity % available to the
 112  *                         partitions pool.
 113  */
 114 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
 115 {
 116         unsigned long rc;
 117         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
 118
 119         rc = plpar_hcall9(H_GET_PPP, retbuf);
 120
 121         ppp_data->entitlement = retbuf[0];
 122         ppp_data->unallocated_entitlement = retbuf[1];
 123
 124         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
 125         ppp_data->pool_num = retbuf[2] & 0xffff;
 126
 127         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
 128         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
 129         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
 130         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
 131         ppp_data->active_system_procs = retbuf[3] & 0xffff;
 132
 133         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
 134         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
 135         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
 136
 137         return rc;
 138 }
 139
 140 static void show_gpci_data(struct seq_file *m)
 141 {
 142         struct hv_gpci_request_buffer *buf;
 143         unsigned int affinity_score;
 144         long ret;
 145
 146         buf = kmalloc(sizeof(*buf), GFP_KERNEL);
 147         if (buf == NULL)
 148                 return;
 149
 150         /*
 151          * Show the local LPAR's affinity score.
 152          *
 153          * 0xB1 selects the Affinity_Domain_Info_By_Partition subcall.
 154          * The score is at byte 0xB in the output buffer.
 155          */
 156         memset(&buf->params, 0, sizeof(buf->params));
 157         buf->params.counter_request = cpu_to_be32(0xB1);
 158         buf->params.starting_index = cpu_to_be32(-1);   /* local LPAR */
 159         buf->params.counter_info_version_in = 0x5;      /* v5+ for score */
 160         ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO, virt_to_phys(buf),
 161                                  sizeof(*buf));
 162         if (ret != H_SUCCESS) {
 163                 pr_debug("hcall failed: H_GET_PERF_COUNTER_INFO: %ld, %x\n",
 164                          ret, be32_to_cpu(buf->params.detail_rc));
 165                 goto out;
 166         }
 167         affinity_score = buf->bytes[0xB];
 168         seq_printf(m, "partition_affinity_score=%u\n", affinity_score);
 169 out:
 170         kfree(buf);
 171 }
 172
 173 static unsigned h_pic(unsigned long *pool_idle_time,
 174                       unsigned long *num_procs)
 175 {
 176         unsigned long rc;
 177         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 178
 179         rc = plpar_hcall(H_PIC, retbuf);
 180
 181         *pool_idle_time = retbuf[0];
 182         *num_procs = retbuf[1];
 183
 184         return rc;
 185 }
 186
 187 /*
 188  * parse_ppp_data
 189  * Parse out the data returned from h_get_ppp and h_pic
 190  */
 191 static void parse_ppp_data(struct seq_file *m)
 192 {
 193         struct hvcall_ppp_data ppp_data;
 194         struct device_node *root;
 195         const __be32 *perf_level;
 196         int rc;
 197
 198         rc = h_get_ppp(&ppp_data);
 199         if (rc)
 200                 return;
 201
 202         seq_printf(m, "partition_entitled_capacity=%lld\n",
 203                    ppp_data.entitlement);
 204         seq_printf(m, "group=%d\n", ppp_data.group_num);
 205         seq_printf(m, "system_active_processors=%d\n",
 206                    ppp_data.active_system_procs);
 207
 208         /* pool related entries are appropriate for shared configs */
 209         if (lppaca_shared_proc()) {
 210                 unsigned long pool_idle_time, pool_procs;
 211
 212                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
 213
 214                 /* report pool_capacity in percentage */
 215                 seq_printf(m, "pool_capacity=%d\n",
 216                            ppp_data.active_procs_in_pool * 100);
 217
 218                 h_pic(&pool_idle_time, &pool_procs);
 219                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
 220                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
 221         }
 222
 223         seq_printf(m, "unallocated_capacity_weight=%d\n",
 224                    ppp_data.unallocated_weight);
 225         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
 226         seq_printf(m, "capped=%d\n", ppp_data.capped);
 227         seq_printf(m, "unallocated_capacity=%lld\n",
 228                    ppp_data.unallocated_entitlement);
 229
 230         /* The last bits of information returned from h_get_ppp are only
 231          * valid if the ibm,partition-performance-parameters-level
 232          * property is >= 1.
 233          */
 234         root = of_find_node_by_path("/");
 235         if (root) {
 236                 perf_level = of_get_property(root,
 237                                 "ibm,partition-performance-parameters-level",
 238                                              NULL);
 239                 if (perf_level && (be32_to_cpup(perf_level) >= 1)) {
 240                         seq_printf(m,
 241                             "physical_procs_allocated_to_virtualization=%d\n",
 242                                    ppp_data.phys_platform_procs);
 243                         seq_printf(m, "max_proc_capacity_available=%d\n",
 244                                    ppp_data.max_proc_cap_avail);
 245                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
 246                                    ppp_data.entitled_proc_cap_avail);
 247                 }
 248
 249                 of_node_put(root);
 250         }
 251 }
 252
 253 /**
 254  * parse_mpp_data
 255  * Parse out data returned from h_get_mpp
 256  */
 257 static void parse_mpp_data(struct seq_file *m)
 258 {
 259         struct hvcall_mpp_data mpp_data;
 260         int rc;
 261
 262         rc = h_get_mpp(&mpp_data);
 263         if (rc)
 264                 return;
 265
 266         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
 267
 268         if (mpp_data.mapped_mem != -1)
 269                 seq_printf(m, "mapped_entitled_memory=%ld\n",
 270                            mpp_data.mapped_mem);
 271
 272         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
 273         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
 274
 275         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
 276         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
 277                    mpp_data.unallocated_mem_weight);
 278         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
 279                    mpp_data.unallocated_entitlement);
 280
 281         if (mpp_data.pool_size != -1)
 282                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
 283                            mpp_data.pool_size);
 284
 285         seq_printf(m, "entitled_memory_loan_request=%ld\n",
 286                    mpp_data.loan_request);
 287
 288         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
 289 }
 290
 291 /**
 292  * parse_mpp_x_data
 293  * Parse out data returned from h_get_mpp_x
 294  */
 295 static void parse_mpp_x_data(struct seq_file *m)
 296 {
 297         struct hvcall_mpp_x_data mpp_x_data;
 298
 299         if (!firmware_has_feature(FW_FEATURE_XCMO))
 300                 return;
 301         if (h_get_mpp_x(&mpp_x_data))
 302                 return;
 303
 304         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
 305
 306         if (mpp_x_data.pool_coalesced_bytes)
 307                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
 308                            mpp_x_data.pool_coalesced_bytes);
 309         if (mpp_x_data.pool_purr_cycles)
 310                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
 311         if (mpp_x_data.pool_spurr_cycles)
 312                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
 313 }
 314
 315 /*
 316  * Read the lpar name using the RTAS ibm,get-system-parameter call.
 317  *
 318  * The name read through this call is updated if changes are made by the end
 319  * user on the hypervisor side.
 320  *
 321  * Some hypervisor (like Qemu) may not provide this value. In that case, a non
 322  * null value is returned.
 323  */
 324 static int read_rtas_lpar_name(struct seq_file *m)
 325 {
 326         struct papr_sysparm_buf *buf;
 327         int err;
 328
 329         buf = papr_sysparm_buf_alloc();
 330         if (!buf)
 331                 return -ENOMEM;
 332
 333         err = papr_sysparm_get(PAPR_SYSPARM_LPAR_NAME, buf);
 334         if (!err)
 335                 seq_printf(m, "partition_name=%s\n", buf->val);
 336
 337         papr_sysparm_buf_free(buf);
 338         return err;
 339 }
 340
 341 /*
 342  * Read the LPAR name from the Device Tree.
 343  *
 344  * The value read in the DT is not updated if the end-user is touching the LPAR
 345  * name on the hypervisor side.
 346  */
 347 static int read_dt_lpar_name(struct seq_file *m)
 348 {
 349         const char *name;
 350
 351         if (of_property_read_string(of_root, "ibm,partition-name", &name))
 352                 return -ENOENT;
 353
 354         seq_printf(m, "partition_name=%s\n", name);
 355         return 0;
 356 }
 357
 358 static void read_lpar_name(struct seq_file *m)
 359 {
 360         if (read_rtas_lpar_name(m) && read_dt_lpar_name(m))
 361                 pr_err_once("Error can't get the LPAR name");
 362 }
 363
 364 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
 365
 366 /*
 367  * parse_system_parameter_string()
 368  * Retrieve the potential_processors, max_entitled_capacity and friends
 369  * through the get-system-parameter rtas call.  Replace keyword strings as
 370  * necessary.
 371  */
 372 static void parse_system_parameter_string(struct seq_file *m)
 373 {
 374         struct papr_sysparm_buf *buf;
 375
 376         buf = papr_sysparm_buf_alloc();
 377         if (!buf)
 378                 return;
 379
 380         if (papr_sysparm_get(PAPR_SYSPARM_SHARED_PROC_LPAR_ATTRS, buf)) {
 381                 goto out_free;
 382         } else {
 383                 const char *local_buffer;
 384                 int splpar_strlen;
 385                 int idx, w_idx;
 386                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
 387
 388                 if (!workbuffer)
 389                         goto out_free;
 390
 391                 splpar_strlen = be16_to_cpu(buf->len);
 392                 local_buffer = buf->val;
 393
 394                 w_idx = 0;
 395                 idx = 0;
 396                 while ((*local_buffer) && (idx < splpar_strlen)) {
 397                         workbuffer[w_idx++] = local_buffer[idx++];
 398                         if ((local_buffer[idx] == ',')
 399                             || (local_buffer[idx] == '\0')) {
 400                                 workbuffer[w_idx] = '\0';
 401                                 if (w_idx) {
 402                                         /* avoid the empty string */
 403                                         seq_printf(m, "%s\n", workbuffer);
 404                                 }
 405                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
 406                                 idx++;  /* skip the comma */
 407                                 w_idx = 0;
 408                         } else if (local_buffer[idx] == '=') {
 409                                 /* code here to replace workbuffer contents
 410                                    with different keyword strings */
 411                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
 412                                         strcpy(workbuffer,
 413                                                "partition_max_entitled_capacity");
 414                                         w_idx = strlen(workbuffer);
 415                                 }
 416                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
 417                                         strcpy(workbuffer,
 418                                                "system_potential_processors");
 419                                         w_idx = strlen(workbuffer);
 420                                 }
 421                         }
 422                 }
 423                 kfree(workbuffer);
 424                 local_buffer -= 2;      /* back up over strlen value */
 425         }
 426 out_free:
 427         papr_sysparm_buf_free(buf);
 428 }
 429
 430 /* Return the number of processors in the system.
 431  * This function reads through the device tree and counts
 432  * the virtual processors, this does not include threads.
 433  */
 434 static int lparcfg_count_active_processors(void)
 435 {
 436         struct device_node *cpus_dn;
 437         int count = 0;
 438
 439         for_each_node_by_type(cpus_dn, "cpu") {
 440 #ifdef LPARCFG_DEBUG
 441                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
 442 #endif
 443                 count++;
 444         }
 445         return count;
 446 }
 447
 448 static void pseries_cmo_data(struct seq_file *m)
 449 {
 450         int cpu;
 451         unsigned long cmo_faults = 0;
 452         unsigned long cmo_fault_time = 0;
 453
 454         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
 455
 456         if (!firmware_has_feature(FW_FEATURE_CMO))
 457                 return;
 458
 459         for_each_possible_cpu(cpu) {
 460                 cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
 461                 cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
 462         }
 463
 464         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
 465         seq_printf(m, "cmo_fault_time_usec=%lu\n",
 466                    cmo_fault_time / tb_ticks_per_usec);
 467         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
 468         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
 469         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
 470 }
 471
 472 static void splpar_dispatch_data(struct seq_file *m)
 473 {
 474         int cpu;
 475         unsigned long dispatches = 0;
 476         unsigned long dispatch_dispersions = 0;
 477
 478         for_each_possible_cpu(cpu) {
 479                 dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
 480                 dispatch_dispersions +=
 481                         be32_to_cpu(lppaca_of(cpu).dispersion_count);
 482         }
 483
 484         seq_printf(m, "dispatches=%lu\n", dispatches);
 485         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 486 }
 487
 488 static void parse_em_data(struct seq_file *m)
 489 {
 490         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 491
 492         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 493             plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
 494                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
 495 }
 496
 497 static void maxmem_data(struct seq_file *m)
 498 {
 499         unsigned long maxmem = 0;
 500
 501         maxmem += (unsigned long)drmem_info->n_lmbs * drmem_info->lmb_size;
 502         maxmem += hugetlb_total_pages() * PAGE_SIZE;
 503
 504         seq_printf(m, "MaxMem=%lu\n", maxmem);
 505 }
 506
 507 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 508 {
 509         int partition_potential_processors;
 510         int partition_active_processors;
 511         struct device_node *rtas_node;
 512         const __be32 *lrdrp = NULL;
 513
 514         rtas_node = of_find_node_by_path("/rtas");
 515         if (rtas_node)
 516                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
 517
 518         if (lrdrp == NULL) {
 519                 partition_potential_processors = vdso_data->processorCount;
 520         } else {
 521                 partition_potential_processors = be32_to_cpup(lrdrp + 4);
 522         }
 523         of_node_put(rtas_node);
 524
 525         partition_active_processors = lparcfg_count_active_processors();
 526
 527         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 528                 /* this call handles the ibm,get-system-parameter contents */
 529                 read_lpar_name(m);
 530                 parse_system_parameter_string(m);
 531                 parse_ppp_data(m);
 532                 parse_mpp_data(m);
 533                 parse_mpp_x_data(m);
 534                 pseries_cmo_data(m);
 535                 splpar_dispatch_data(m);
 536
 537                 seq_printf(m, "purr=%ld\n", get_purr());
 538                 seq_printf(m, "tbr=%ld\n", mftb());
 539         } else {                /* non SPLPAR case */
 540
 541                 seq_printf(m, "system_active_processors=%d\n",
 542                            partition_potential_processors);
 543
 544                 seq_printf(m, "system_potential_processors=%d\n",
 545                            partition_potential_processors);
 546
 547                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
 548                            partition_potential_processors * 100);
 549
 550                 seq_printf(m, "partition_entitled_capacity=%d\n",
 551                            partition_active_processors * 100);
 552         }
 553
 554         show_gpci_data(m);
 555
 556         seq_printf(m, "partition_active_processors=%d\n",
 557                    partition_active_processors);
 558
 559         seq_printf(m, "partition_potential_processors=%d\n",
 560                    partition_potential_processors);
 561
 562         seq_printf(m, "shared_processor_mode=%d\n",
 563                    lppaca_shared_proc());
 564
 565 #ifdef CONFIG_PPC_64S_HASH_MMU
 566         if (!radix_enabled())
 567                 seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 568 #endif
 569         parse_em_data(m);
 570         maxmem_data(m);
 571
 572         seq_printf(m, "security_flavor=%u\n", pseries_security_flavor);
 573
 574         return 0;
 575 }
 576
 577 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
 578 {
 579         struct hvcall_ppp_data ppp_data;
 580         u8 new_weight;
 581         u64 new_entitled;
 582         ssize_t retval;
 583
 584         /* Get our current parameters */
 585         retval = h_get_ppp(&ppp_data);
 586         if (retval)
 587                 return retval;
 588
 589         if (entitlement) {
 590                 new_weight = ppp_data.weight;
 591                 new_entitled = *entitlement;
 592         } else if (weight) {
 593                 new_weight = *weight;
 594                 new_entitled = ppp_data.entitlement;
 595         } else
 596                 return -EINVAL;
 597
 598         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
 599                  __func__, ppp_data.entitlement, ppp_data.weight);
 600
 601         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 602                  __func__, new_entitled, new_weight);
 603
 604         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
 605         return retval;
 606 }
 607
 608 /**
 609  * update_mpp
 610  *
 611  * Update the memory entitlement and weight for the partition.  Caller must
 612  * specify either a new entitlement or weight, not both, to be updated
 613  * since the h_set_mpp call takes both entitlement and weight as parameters.
 614  */
 615 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
 616 {
 617         struct hvcall_mpp_data mpp_data;
 618         u64 new_entitled;
 619         u8 new_weight;
 620         ssize_t rc;
 621
 622         if (entitlement) {
 623                 /* Check with vio to ensure the new memory entitlement
 624                  * can be handled.
 625                  */
 626                 rc = vio_cmo_entitlement_update(*entitlement);
 627                 if (rc)
 628                         return rc;
 629         }
 630
 631         rc = h_get_mpp(&mpp_data);
 632         if (rc)
 633                 return rc;
 634
 635         if (entitlement) {
 636                 new_weight = mpp_data.mem_weight;
 637                 new_entitled = *entitlement;
 638         } else if (weight) {
 639                 new_weight = *weight;
 640                 new_entitled = mpp_data.entitled_mem;
 641         } else
 642                 return -EINVAL;
 643
 644         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 645                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
 646
 647         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
 648                  __func__, new_entitled, new_weight);
 649
 650         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
 651         return rc;
 652 }
 653
 654 /*
 655  * Interface for changing system parameters (variable capacity weight
 656  * and entitled capacity).  Format of input is "param_name=value";
 657  * anything after value is ignored.  Valid parameters at this time are
 658  * "partition_entitled_capacity" and "capacity_weight".  We use
 659  * H_SET_PPP to alter parameters.
 660  *
 661  * This function should be invoked only on systems with
 662  * FW_FEATURE_SPLPAR.
 663  */
 664 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 665                              size_t count, loff_t * off)
 666 {
 667         char kbuf[64];
 668         char *tmp;
 669         u64 new_entitled, *new_entitled_ptr = &new_entitled;
 670         u8 new_weight, *new_weight_ptr = &new_weight;
 671         ssize_t retval;
 672
 673         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 674                 return -EINVAL;
 675
 676         if (count > sizeof(kbuf))
 677                 return -EINVAL;
 678
 679         if (copy_from_user(kbuf, buf, count))
 680                 return -EFAULT;
 681
 682         kbuf[count - 1] = '\0';
 683         tmp = strchr(kbuf, '=');
 684         if (!tmp)
 685                 return -EINVAL;
 686
 687         *tmp++ = '\0';
 688
 689         if (!strcmp(kbuf, "partition_entitled_capacity")) {
 690                 char *endp;
 691                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 692                 if (endp == tmp)
 693                         return -EINVAL;
 694
 695                 retval = update_ppp(new_entitled_ptr, NULL);
 696
 697                 if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 698                         /*
 699                          * The hypervisor assigns VAS resources based
 700                          * on entitled capacity for shared mode.
 701                          * Reconfig VAS windows based on DLPAR CPU events.
 702                          */
 703                         if (pseries_vas_dlpar_cpu() != 0)
 704                                 retval = H_HARDWARE;
 705                 }
 706         } else if (!strcmp(kbuf, "capacity_weight")) {
 707                 char *endp;
 708                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 709                 if (endp == tmp)
 710                         return -EINVAL;
 711
 712                 retval = update_ppp(NULL, new_weight_ptr);
 713         } else if (!strcmp(kbuf, "entitled_memory")) {
 714                 char *endp;
 715                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
 716                 if (endp == tmp)
 717                         return -EINVAL;
 718
 719                 retval = update_mpp(new_entitled_ptr, NULL);
 720         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
 721                 char *endp;
 722                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
 723                 if (endp == tmp)
 724                         return -EINVAL;
 725
 726                 retval = update_mpp(NULL, new_weight_ptr);
 727         } else
 728                 return -EINVAL;
 729
 730         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
 731                 retval = count;
 732         } else if (retval == H_BUSY) {
 733                 retval = -EBUSY;
 734         } else if (retval == H_HARDWARE) {
 735                 retval = -EIO;
 736         } else if (retval == H_PARAMETER) {
 737                 retval = -EINVAL;
 738         }
 739
 740         return retval;
 741 }
 742
 743 static int lparcfg_data(struct seq_file *m, void *v)
 744 {
 745         struct device_node *rootdn;
 746         const char *model = "";
 747         const char *system_id = "";
 748         const char *tmp;
 749         const __be32 *lp_index_ptr;
 750         unsigned int lp_index = 0;
 751
 752         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
 753
 754         rootdn = of_find_node_by_path("/");
 755         if (rootdn) {
 756                 tmp = of_get_property(rootdn, "model", NULL);
 757                 if (tmp)
 758                         model = tmp;
 759                 tmp = of_get_property(rootdn, "system-id", NULL);
 760                 if (tmp)
 761                         system_id = tmp;
 762                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
 763                                         NULL);
 764                 if (lp_index_ptr)
 765                         lp_index = be32_to_cpup(lp_index_ptr);
 766                 of_node_put(rootdn);
 767         }
 768         seq_printf(m, "serial_number=%s\n", system_id);
 769         seq_printf(m, "system_type=%s\n", model);
 770         seq_printf(m, "partition_id=%d\n", (int)lp_index);
 771
 772         return pseries_lparcfg_data(m, v);
 773 }
 774
 775 static int lparcfg_open(struct inode *inode, struct file *file)
 776 {
 777         return single_open(file, lparcfg_data, NULL);
 778 }
 779
 780 static const struct proc_ops lparcfg_proc_ops = {
 781         .proc_read      = seq_read,
 782         .proc_write     = lparcfg_write,
 783         .proc_open      = lparcfg_open,
 784         .proc_release   = single_release,
 785         .proc_lseek     = seq_lseek,
 786 };
 787
 788 static int __init lparcfg_init(void)
 789 {
 790         umode_t mode = 0444;
 791
 792         /* Allow writing if we have FW_FEATURE_SPLPAR */
 793         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 794                 mode |= 0200;
 795
 796         if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_proc_ops)) {
 797                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
 798                 return -EIO;
 799         }
 800         return 0;
 801 }
 802 machine_device_initcall(pseries, lparcfg_init);