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/vdso_datapage.h> 32 #include <asm/vio.h> 33 #include <asm/mmu.h> 34 #include <asm/machdep.h> 35 #include <asm/drmem.h> 36 37 #include "pseries.h" 38 39 /* 40 * This isn't a module but we expose that to userspace 41 * via /proc so leave the definitions here 42 */ 43 #define MODULE_VERS "1.9" 44 #define MODULE_NAME "lparcfg" 45 46 /* #define LPARCFG_DEBUG */ 47 48 /* 49 * Track sum of all purrs across all processors. This is used to further 50 * calculate usage values by different applications 51 */ 52 static void cpu_get_purr(void *arg) 53 { 54 atomic64_t *sum = arg; 55 56 atomic64_add(mfspr(SPRN_PURR), sum); 57 } 58 59 static unsigned long get_purr(void) 60 { 61 atomic64_t purr = ATOMIC64_INIT(0); 62 63 on_each_cpu(cpu_get_purr, &purr, 1); 64 65 return atomic64_read(&purr); 66 } 67 68 /* 69 * Methods used to fetch LPAR data when running on a pSeries platform. 70 */ 71 72 struct hvcall_ppp_data { 73 u64 entitlement; 74 u64 unallocated_entitlement; 75 u16 group_num; 76 u16 pool_num; 77 u8 capped; 78 u8 weight; 79 u8 unallocated_weight; 80 u16 active_procs_in_pool; 81 u16 active_system_procs; 82 u16 phys_platform_procs; 83 u32 max_proc_cap_avail; 84 u32 entitled_proc_cap_avail; 85 }; 86 87 /* 88 * H_GET_PPP hcall returns info in 4 parms. 89 * entitled_capacity,unallocated_capacity, 90 * aggregation, resource_capability). 91 * 92 * R4 = Entitled Processor Capacity Percentage. 93 * R5 = Unallocated Processor Capacity Percentage. 94 * R6 (AABBCCDDEEFFGGHH). 95 * XXXX - reserved (0) 96 * XXXX - reserved (0) 97 * XXXX - Group Number 98 * XXXX - Pool Number. 99 * R7 (IIJJKKLLMMNNOOPP). 100 * XX - reserved. (0) 101 * XX - bit 0-6 reserved (0). bit 7 is Capped indicator. 102 * XX - variable processor Capacity Weight 103 * XX - Unallocated Variable Processor Capacity Weight. 104 * XXXX - Active processors in Physical Processor Pool. 105 * XXXX - Processors active on platform. 106 * R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1 107 * XXXX - Physical platform procs allocated to virtualization. 108 * XXXXXX - Max procs capacity % available to the partitions pool. 109 * XXXXXX - Entitled procs capacity % available to the 110 * partitions pool. 111 */ 112 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data) 113 { 114 unsigned long rc; 115 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 116 117 rc = plpar_hcall9(H_GET_PPP, retbuf); 118 119 ppp_data->entitlement = retbuf[0]; 120 ppp_data->unallocated_entitlement = retbuf[1]; 121 122 ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; 123 ppp_data->pool_num = retbuf[2] & 0xffff; 124 125 ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01; 126 ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff; 127 ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff; 128 ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff; 129 ppp_data->active_system_procs = retbuf[3] & 0xffff; 130 131 ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8; 132 ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff; 133 ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff; 134 135 return rc; 136 } 137 138 static void show_gpci_data(struct seq_file *m) 139 { 140 struct hv_gpci_request_buffer *buf; 141 unsigned int affinity_score; 142 long ret; 143 144 buf = kmalloc(sizeof(*buf), GFP_KERNEL); 145 if (buf == NULL) 146 return; 147 148 /* 149 * Show the local LPAR's affinity score. 150 * 151 * 0xB1 selects the Affinity_Domain_Info_By_Partition subcall. 152 * The score is at byte 0xB in the output buffer. 153 */ 154 memset(&buf->params, 0, sizeof(buf->params)); 155 buf->params.counter_request = cpu_to_be32(0xB1); 156 buf->params.starting_index = cpu_to_be32(-1); /* local LPAR */ 157 buf->params.counter_info_version_in = 0x5; /* v5+ for score */ 158 ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO, virt_to_phys(buf), 159 sizeof(*buf)); 160 if (ret != H_SUCCESS) { 161 pr_debug("hcall failed: H_GET_PERF_COUNTER_INFO: %ld, %x\n", 162 ret, be32_to_cpu(buf->params.detail_rc)); 163 goto out; 164 } 165 affinity_score = buf->bytes[0xB]; 166 seq_printf(m, "partition_affinity_score=%u\n", affinity_score); 167 out: 168 kfree(buf); 169 } 170 171 static unsigned h_pic(unsigned long *pool_idle_time, 172 unsigned long *num_procs) 173 { 174 unsigned long rc; 175 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 176 177 rc = plpar_hcall(H_PIC, retbuf); 178 179 *pool_idle_time = retbuf[0]; 180 *num_procs = retbuf[1]; 181 182 return rc; 183 } 184 185 /* 186 * parse_ppp_data 187 * Parse out the data returned from h_get_ppp and h_pic 188 */ 189 static void parse_ppp_data(struct seq_file *m) 190 { 191 struct hvcall_ppp_data ppp_data; 192 struct device_node *root; 193 const __be32 *perf_level; 194 int rc; 195 196 rc = h_get_ppp(&ppp_data); 197 if (rc) 198 return; 199 200 seq_printf(m, "partition_entitled_capacity=%lld\n", 201 ppp_data.entitlement); 202 seq_printf(m, "group=%d\n", ppp_data.group_num); 203 seq_printf(m, "system_active_processors=%d\n", 204 ppp_data.active_system_procs); 205 206 /* pool related entries are appropriate for shared configs */ 207 if (lppaca_shared_proc(get_lppaca())) { 208 unsigned long pool_idle_time, pool_procs; 209 210 seq_printf(m, "pool=%d\n", ppp_data.pool_num); 211 212 /* report pool_capacity in percentage */ 213 seq_printf(m, "pool_capacity=%d\n", 214 ppp_data.active_procs_in_pool * 100); 215 216 h_pic(&pool_idle_time, &pool_procs); 217 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time); 218 seq_printf(m, "pool_num_procs=%ld\n", pool_procs); 219 } 220 221 seq_printf(m, "unallocated_capacity_weight=%d\n", 222 ppp_data.unallocated_weight); 223 seq_printf(m, "capacity_weight=%d\n", ppp_data.weight); 224 seq_printf(m, "capped=%d\n", ppp_data.capped); 225 seq_printf(m, "unallocated_capacity=%lld\n", 226 ppp_data.unallocated_entitlement); 227 228 /* The last bits of information returned from h_get_ppp are only 229 * valid if the ibm,partition-performance-parameters-level 230 * property is >= 1. 231 */ 232 root = of_find_node_by_path("/"); 233 if (root) { 234 perf_level = of_get_property(root, 235 "ibm,partition-performance-parameters-level", 236 NULL); 237 if (perf_level && (be32_to_cpup(perf_level) >= 1)) { 238 seq_printf(m, 239 "physical_procs_allocated_to_virtualization=%d\n", 240 ppp_data.phys_platform_procs); 241 seq_printf(m, "max_proc_capacity_available=%d\n", 242 ppp_data.max_proc_cap_avail); 243 seq_printf(m, "entitled_proc_capacity_available=%d\n", 244 ppp_data.entitled_proc_cap_avail); 245 } 246 247 of_node_put(root); 248 } 249 } 250 251 /** 252 * parse_mpp_data 253 * Parse out data returned from h_get_mpp 254 */ 255 static void parse_mpp_data(struct seq_file *m) 256 { 257 struct hvcall_mpp_data mpp_data; 258 int rc; 259 260 rc = h_get_mpp(&mpp_data); 261 if (rc) 262 return; 263 264 seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem); 265 266 if (mpp_data.mapped_mem != -1) 267 seq_printf(m, "mapped_entitled_memory=%ld\n", 268 mpp_data.mapped_mem); 269 270 seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num); 271 seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num); 272 273 seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight); 274 seq_printf(m, "unallocated_entitled_memory_weight=%d\n", 275 mpp_data.unallocated_mem_weight); 276 seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n", 277 mpp_data.unallocated_entitlement); 278 279 if (mpp_data.pool_size != -1) 280 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n", 281 mpp_data.pool_size); 282 283 seq_printf(m, "entitled_memory_loan_request=%ld\n", 284 mpp_data.loan_request); 285 286 seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem); 287 } 288 289 /** 290 * parse_mpp_x_data 291 * Parse out data returned from h_get_mpp_x 292 */ 293 static void parse_mpp_x_data(struct seq_file *m) 294 { 295 struct hvcall_mpp_x_data mpp_x_data; 296 297 if (!firmware_has_feature(FW_FEATURE_XCMO)) 298 return; 299 if (h_get_mpp_x(&mpp_x_data)) 300 return; 301 302 seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes); 303 304 if (mpp_x_data.pool_coalesced_bytes) 305 seq_printf(m, "pool_coalesced_bytes=%ld\n", 306 mpp_x_data.pool_coalesced_bytes); 307 if (mpp_x_data.pool_purr_cycles) 308 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles); 309 if (mpp_x_data.pool_spurr_cycles) 310 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles); 311 } 312 313 /* 314 * PAPR defines, in section "7.3.16 System Parameters Option", the token 55 to 315 * read the LPAR name, and the largest output data to 4000 + 2 bytes length. 316 */ 317 #define SPLPAR_LPAR_NAME_TOKEN 55 318 #define GET_SYS_PARM_BUF_SIZE 4002 319 #if GET_SYS_PARM_BUF_SIZE > RTAS_DATA_BUF_SIZE 320 #error "GET_SYS_PARM_BUF_SIZE is larger than RTAS_DATA_BUF_SIZE" 321 #endif 322 323 /* 324 * Read the lpar name using the RTAS ibm,get-system-parameter call. 325 * 326 * The name read through this call is updated if changes are made by the end 327 * user on the hypervisor side. 328 * 329 * Some hypervisor (like Qemu) may not provide this value. In that case, a non 330 * null value is returned. 331 */ 332 static int read_rtas_lpar_name(struct seq_file *m) 333 { 334 int rc, len, token; 335 union { 336 char raw_buffer[GET_SYS_PARM_BUF_SIZE]; 337 struct { 338 __be16 len; 339 char name[GET_SYS_PARM_BUF_SIZE-2]; 340 }; 341 } *local_buffer; 342 343 token = rtas_token("ibm,get-system-parameter"); 344 if (token == RTAS_UNKNOWN_SERVICE) 345 return -EINVAL; 346 347 local_buffer = kmalloc(sizeof(*local_buffer), GFP_KERNEL); 348 if (!local_buffer) 349 return -ENOMEM; 350 351 do { 352 spin_lock(&rtas_data_buf_lock); 353 memset(rtas_data_buf, 0, sizeof(*local_buffer)); 354 rc = rtas_call(token, 3, 1, NULL, SPLPAR_LPAR_NAME_TOKEN, 355 __pa(rtas_data_buf), sizeof(*local_buffer)); 356 if (!rc) 357 memcpy(local_buffer->raw_buffer, rtas_data_buf, 358 sizeof(local_buffer->raw_buffer)); 359 spin_unlock(&rtas_data_buf_lock); 360 } while (rtas_busy_delay(rc)); 361 362 if (!rc) { 363 /* Force end of string */ 364 len = min((int) be16_to_cpu(local_buffer->len), 365 (int) sizeof(local_buffer->name)-1); 366 local_buffer->name[len] = '\0'; 367 368 seq_printf(m, "partition_name=%s\n", local_buffer->name); 369 } else 370 rc = -ENODATA; 371 372 kfree(local_buffer); 373 return rc; 374 } 375 376 /* 377 * Read the LPAR name from the Device Tree. 378 * 379 * The value read in the DT is not updated if the end-user is touching the LPAR 380 * name on the hypervisor side. 381 */ 382 static int read_dt_lpar_name(struct seq_file *m) 383 { 384 const char *name; 385 386 if (of_property_read_string(of_root, "ibm,partition-name", &name)) 387 return -ENOENT; 388 389 seq_printf(m, "partition_name=%s\n", name); 390 return 0; 391 } 392 393 static void read_lpar_name(struct seq_file *m) 394 { 395 if (read_rtas_lpar_name(m) && read_dt_lpar_name(m)) 396 pr_err_once("Error can't get the LPAR name"); 397 } 398 399 #define SPLPAR_CHARACTERISTICS_TOKEN 20 400 #define SPLPAR_MAXLENGTH 1026*(sizeof(char)) 401 402 /* 403 * parse_system_parameter_string() 404 * Retrieve the potential_processors, max_entitled_capacity and friends 405 * through the get-system-parameter rtas call. Replace keyword strings as 406 * necessary. 407 */ 408 static void parse_system_parameter_string(struct seq_file *m) 409 { 410 int call_status; 411 412 unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL); 413 if (!local_buffer) { 414 printk(KERN_ERR "%s %s kmalloc failure at line %d\n", 415 __FILE__, __func__, __LINE__); 416 return; 417 } 418 419 spin_lock(&rtas_data_buf_lock); 420 memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH); 421 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 422 NULL, 423 SPLPAR_CHARACTERISTICS_TOKEN, 424 __pa(rtas_data_buf), 425 RTAS_DATA_BUF_SIZE); 426 memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH); 427 local_buffer[SPLPAR_MAXLENGTH - 1] = '\0'; 428 spin_unlock(&rtas_data_buf_lock); 429 430 if (call_status != 0) { 431 printk(KERN_INFO 432 "%s %s Error calling get-system-parameter (0x%x)\n", 433 __FILE__, __func__, call_status); 434 } else { 435 int splpar_strlen; 436 int idx, w_idx; 437 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL); 438 if (!workbuffer) { 439 printk(KERN_ERR "%s %s kmalloc failure at line %d\n", 440 __FILE__, __func__, __LINE__); 441 kfree(local_buffer); 442 return; 443 } 444 #ifdef LPARCFG_DEBUG 445 printk(KERN_INFO "success calling get-system-parameter\n"); 446 #endif 447 splpar_strlen = local_buffer[0] * 256 + local_buffer[1]; 448 local_buffer += 2; /* step over strlen value */ 449 450 w_idx = 0; 451 idx = 0; 452 while ((*local_buffer) && (idx < splpar_strlen)) { 453 workbuffer[w_idx++] = local_buffer[idx++]; 454 if ((local_buffer[idx] == ',') 455 || (local_buffer[idx] == '\0')) { 456 workbuffer[w_idx] = '\0'; 457 if (w_idx) { 458 /* avoid the empty string */ 459 seq_printf(m, "%s\n", workbuffer); 460 } 461 memset(workbuffer, 0, SPLPAR_MAXLENGTH); 462 idx++; /* skip the comma */ 463 w_idx = 0; 464 } else if (local_buffer[idx] == '=') { 465 /* code here to replace workbuffer contents 466 with different keyword strings */ 467 if (0 == strcmp(workbuffer, "MaxEntCap")) { 468 strcpy(workbuffer, 469 "partition_max_entitled_capacity"); 470 w_idx = strlen(workbuffer); 471 } 472 if (0 == strcmp(workbuffer, "MaxPlatProcs")) { 473 strcpy(workbuffer, 474 "system_potential_processors"); 475 w_idx = strlen(workbuffer); 476 } 477 } 478 } 479 kfree(workbuffer); 480 local_buffer -= 2; /* back up over strlen value */ 481 } 482 kfree(local_buffer); 483 } 484 485 /* Return the number of processors in the system. 486 * This function reads through the device tree and counts 487 * the virtual processors, this does not include threads. 488 */ 489 static int lparcfg_count_active_processors(void) 490 { 491 struct device_node *cpus_dn; 492 int count = 0; 493 494 for_each_node_by_type(cpus_dn, "cpu") { 495 #ifdef LPARCFG_DEBUG 496 printk(KERN_ERR "cpus_dn %p\n", cpus_dn); 497 #endif 498 count++; 499 } 500 return count; 501 } 502 503 static void pseries_cmo_data(struct seq_file *m) 504 { 505 int cpu; 506 unsigned long cmo_faults = 0; 507 unsigned long cmo_fault_time = 0; 508 509 seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO)); 510 511 if (!firmware_has_feature(FW_FEATURE_CMO)) 512 return; 513 514 for_each_possible_cpu(cpu) { 515 cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults); 516 cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time); 517 } 518 519 seq_printf(m, "cmo_faults=%lu\n", cmo_faults); 520 seq_printf(m, "cmo_fault_time_usec=%lu\n", 521 cmo_fault_time / tb_ticks_per_usec); 522 seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp()); 523 seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp()); 524 seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size()); 525 } 526 527 static void splpar_dispatch_data(struct seq_file *m) 528 { 529 int cpu; 530 unsigned long dispatches = 0; 531 unsigned long dispatch_dispersions = 0; 532 533 for_each_possible_cpu(cpu) { 534 dispatches += be32_to_cpu(lppaca_of(cpu).yield_count); 535 dispatch_dispersions += 536 be32_to_cpu(lppaca_of(cpu).dispersion_count); 537 } 538 539 seq_printf(m, "dispatches=%lu\n", dispatches); 540 seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions); 541 } 542 543 static void parse_em_data(struct seq_file *m) 544 { 545 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 546 547 if (firmware_has_feature(FW_FEATURE_LPAR) && 548 plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS) 549 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]); 550 } 551 552 static void maxmem_data(struct seq_file *m) 553 { 554 unsigned long maxmem = 0; 555 556 maxmem += (unsigned long)drmem_info->n_lmbs * drmem_info->lmb_size; 557 maxmem += hugetlb_total_pages() * PAGE_SIZE; 558 559 seq_printf(m, "MaxMem=%lu\n", maxmem); 560 } 561 562 static int pseries_lparcfg_data(struct seq_file *m, void *v) 563 { 564 int partition_potential_processors; 565 int partition_active_processors; 566 struct device_node *rtas_node; 567 const __be32 *lrdrp = NULL; 568 569 rtas_node = of_find_node_by_path("/rtas"); 570 if (rtas_node) 571 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL); 572 573 if (lrdrp == NULL) { 574 partition_potential_processors = vdso_data->processorCount; 575 } else { 576 partition_potential_processors = be32_to_cpup(lrdrp + 4); 577 } 578 of_node_put(rtas_node); 579 580 partition_active_processors = lparcfg_count_active_processors(); 581 582 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 583 /* this call handles the ibm,get-system-parameter contents */ 584 read_lpar_name(m); 585 parse_system_parameter_string(m); 586 parse_ppp_data(m); 587 parse_mpp_data(m); 588 parse_mpp_x_data(m); 589 pseries_cmo_data(m); 590 splpar_dispatch_data(m); 591 592 seq_printf(m, "purr=%ld\n", get_purr()); 593 seq_printf(m, "tbr=%ld\n", mftb()); 594 } else { /* non SPLPAR case */ 595 596 seq_printf(m, "system_active_processors=%d\n", 597 partition_potential_processors); 598 599 seq_printf(m, "system_potential_processors=%d\n", 600 partition_potential_processors); 601 602 seq_printf(m, "partition_max_entitled_capacity=%d\n", 603 partition_potential_processors * 100); 604 605 seq_printf(m, "partition_entitled_capacity=%d\n", 606 partition_active_processors * 100); 607 } 608 609 show_gpci_data(m); 610 611 seq_printf(m, "partition_active_processors=%d\n", 612 partition_active_processors); 613 614 seq_printf(m, "partition_potential_processors=%d\n", 615 partition_potential_processors); 616 617 seq_printf(m, "shared_processor_mode=%d\n", 618 lppaca_shared_proc(get_lppaca())); 619 620 #ifdef CONFIG_PPC_64S_HASH_MMU 621 if (!radix_enabled()) 622 seq_printf(m, "slb_size=%d\n", mmu_slb_size); 623 #endif 624 parse_em_data(m); 625 maxmem_data(m); 626 627 seq_printf(m, "security_flavor=%u\n", pseries_security_flavor); 628 629 return 0; 630 } 631 632 static ssize_t update_ppp(u64 *entitlement, u8 *weight) 633 { 634 struct hvcall_ppp_data ppp_data; 635 u8 new_weight; 636 u64 new_entitled; 637 ssize_t retval; 638 639 /* Get our current parameters */ 640 retval = h_get_ppp(&ppp_data); 641 if (retval) 642 return retval; 643 644 if (entitlement) { 645 new_weight = ppp_data.weight; 646 new_entitled = *entitlement; 647 } else if (weight) { 648 new_weight = *weight; 649 new_entitled = ppp_data.entitlement; 650 } else 651 return -EINVAL; 652 653 pr_debug("%s: current_entitled = %llu, current_weight = %u\n", 654 __func__, ppp_data.entitlement, ppp_data.weight); 655 656 pr_debug("%s: new_entitled = %llu, new_weight = %u\n", 657 __func__, new_entitled, new_weight); 658 659 retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight); 660 return retval; 661 } 662 663 /** 664 * update_mpp 665 * 666 * Update the memory entitlement and weight for the partition. Caller must 667 * specify either a new entitlement or weight, not both, to be updated 668 * since the h_set_mpp call takes both entitlement and weight as parameters. 669 */ 670 static ssize_t update_mpp(u64 *entitlement, u8 *weight) 671 { 672 struct hvcall_mpp_data mpp_data; 673 u64 new_entitled; 674 u8 new_weight; 675 ssize_t rc; 676 677 if (entitlement) { 678 /* Check with vio to ensure the new memory entitlement 679 * can be handled. 680 */ 681 rc = vio_cmo_entitlement_update(*entitlement); 682 if (rc) 683 return rc; 684 } 685 686 rc = h_get_mpp(&mpp_data); 687 if (rc) 688 return rc; 689 690 if (entitlement) { 691 new_weight = mpp_data.mem_weight; 692 new_entitled = *entitlement; 693 } else if (weight) { 694 new_weight = *weight; 695 new_entitled = mpp_data.entitled_mem; 696 } else 697 return -EINVAL; 698 699 pr_debug("%s: current_entitled = %lu, current_weight = %u\n", 700 __func__, mpp_data.entitled_mem, mpp_data.mem_weight); 701 702 pr_debug("%s: new_entitled = %llu, new_weight = %u\n", 703 __func__, new_entitled, new_weight); 704 705 rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight); 706 return rc; 707 } 708 709 /* 710 * Interface for changing system parameters (variable capacity weight 711 * and entitled capacity). Format of input is "param_name=value"; 712 * anything after value is ignored. Valid parameters at this time are 713 * "partition_entitled_capacity" and "capacity_weight". We use 714 * H_SET_PPP to alter parameters. 715 * 716 * This function should be invoked only on systems with 717 * FW_FEATURE_SPLPAR. 718 */ 719 static ssize_t lparcfg_write(struct file *file, const char __user * buf, 720 size_t count, loff_t * off) 721 { 722 char kbuf[64]; 723 char *tmp; 724 u64 new_entitled, *new_entitled_ptr = &new_entitled; 725 u8 new_weight, *new_weight_ptr = &new_weight; 726 ssize_t retval; 727 728 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 729 return -EINVAL; 730 731 if (count > sizeof(kbuf)) 732 return -EINVAL; 733 734 if (copy_from_user(kbuf, buf, count)) 735 return -EFAULT; 736 737 kbuf[count - 1] = '\0'; 738 tmp = strchr(kbuf, '='); 739 if (!tmp) 740 return -EINVAL; 741 742 *tmp++ = '\0'; 743 744 if (!strcmp(kbuf, "partition_entitled_capacity")) { 745 char *endp; 746 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10); 747 if (endp == tmp) 748 return -EINVAL; 749 750 retval = update_ppp(new_entitled_ptr, NULL); 751 } else if (!strcmp(kbuf, "capacity_weight")) { 752 char *endp; 753 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10); 754 if (endp == tmp) 755 return -EINVAL; 756 757 retval = update_ppp(NULL, new_weight_ptr); 758 } else if (!strcmp(kbuf, "entitled_memory")) { 759 char *endp; 760 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10); 761 if (endp == tmp) 762 return -EINVAL; 763 764 retval = update_mpp(new_entitled_ptr, NULL); 765 } else if (!strcmp(kbuf, "entitled_memory_weight")) { 766 char *endp; 767 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10); 768 if (endp == tmp) 769 return -EINVAL; 770 771 retval = update_mpp(NULL, new_weight_ptr); 772 } else 773 return -EINVAL; 774 775 if (retval == H_SUCCESS || retval == H_CONSTRAINED) { 776 retval = count; 777 } else if (retval == H_BUSY) { 778 retval = -EBUSY; 779 } else if (retval == H_HARDWARE) { 780 retval = -EIO; 781 } else if (retval == H_PARAMETER) { 782 retval = -EINVAL; 783 } 784 785 return retval; 786 } 787 788 static int lparcfg_data(struct seq_file *m, void *v) 789 { 790 struct device_node *rootdn; 791 const char *model = ""; 792 const char *system_id = ""; 793 const char *tmp; 794 const __be32 *lp_index_ptr; 795 unsigned int lp_index = 0; 796 797 seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS); 798 799 rootdn = of_find_node_by_path("/"); 800 if (rootdn) { 801 tmp = of_get_property(rootdn, "model", NULL); 802 if (tmp) 803 model = tmp; 804 tmp = of_get_property(rootdn, "system-id", NULL); 805 if (tmp) 806 system_id = tmp; 807 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no", 808 NULL); 809 if (lp_index_ptr) 810 lp_index = be32_to_cpup(lp_index_ptr); 811 of_node_put(rootdn); 812 } 813 seq_printf(m, "serial_number=%s\n", system_id); 814 seq_printf(m, "system_type=%s\n", model); 815 seq_printf(m, "partition_id=%d\n", (int)lp_index); 816 817 return pseries_lparcfg_data(m, v); 818 } 819 820 static int lparcfg_open(struct inode *inode, struct file *file) 821 { 822 return single_open(file, lparcfg_data, NULL); 823 } 824 825 static const struct proc_ops lparcfg_proc_ops = { 826 .proc_read = seq_read, 827 .proc_write = lparcfg_write, 828 .proc_open = lparcfg_open, 829 .proc_release = single_release, 830 .proc_lseek = seq_lseek, 831 }; 832 833 static int __init lparcfg_init(void) 834 { 835 umode_t mode = 0444; 836 837 /* Allow writing if we have FW_FEATURE_SPLPAR */ 838 if (firmware_has_feature(FW_FEATURE_SPLPAR)) 839 mode |= 0200; 840 841 if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_proc_ops)) { 842 printk(KERN_ERR "Failed to create powerpc/lparcfg\n"); 843 return -EIO; 844 } 845 return 0; 846 } 847 machine_device_initcall(pseries, lparcfg_init); 848