1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * pSeries_lpar.c 4 * Copyright (C) 2001 Todd Inglett, IBM Corporation 5 * 6 * pSeries LPAR support. 7 */ 8 9/* Enables debugging of low-level hash table routines - careful! */ 10#undef DEBUG 11#define pr_fmt(fmt) "lpar: " fmt 12 13#include <linux/kernel.h> 14#include <linux/dma-mapping.h> 15#include <linux/console.h> 16#include <linux/export.h> 17#include <linux/jump_label.h> 18#include <linux/delay.h> 19#include <linux/stop_machine.h> 20#include <linux/spinlock.h> 21#include <linux/cpuhotplug.h> 22#include <linux/workqueue.h> 23#include <linux/proc_fs.h> 24#include <linux/pgtable.h> 25#include <asm/processor.h> 26#include <asm/mmu.h> 27#include <asm/page.h> 28#include <asm/machdep.h> 29#include <asm/mmu_context.h> 30#include <asm/iommu.h> 31#include <asm/tlb.h> 32#include <asm/prom.h> 33#include <asm/cputable.h> 34#include <asm/udbg.h> 35#include <asm/smp.h> 36#include <asm/trace.h> 37#include <asm/firmware.h> 38#include <asm/plpar_wrappers.h> 39#include <asm/kexec.h> 40#include <asm/fadump.h> 41#include <asm/asm-prototypes.h> 42#include <asm/debugfs.h> 43#include <asm/dtl.h> 44 45#include "pseries.h" 46 47/* Flag bits for H_BULK_REMOVE */ 48#define HBR_REQUEST 0x4000000000000000UL 49#define HBR_RESPONSE 0x8000000000000000UL 50#define HBR_END 0xc000000000000000UL 51#define HBR_AVPN 0x0200000000000000UL 52#define HBR_ANDCOND 0x0100000000000000UL 53 54 55/* in hvCall.S */ 56EXPORT_SYMBOL(plpar_hcall); 57EXPORT_SYMBOL(plpar_hcall9); 58EXPORT_SYMBOL(plpar_hcall_norets); 59 60/* 61 * H_BLOCK_REMOVE supported block size for this page size in segment who's base 62 * page size is that page size. 63 * 64 * The first index is the segment base page size, the second one is the actual 65 * page size. 66 */ 67static int hblkrm_size[MMU_PAGE_COUNT][MMU_PAGE_COUNT] __ro_after_init; 68 69/* 70 * Due to the involved complexity, and that the current hypervisor is only 71 * returning this value or 0, we are limiting the support of the H_BLOCK_REMOVE 72 * buffer size to 8 size block. 73 */ 74#define HBLKRM_SUPPORTED_BLOCK_SIZE 8 75 76#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 77static u8 dtl_mask = DTL_LOG_PREEMPT; 78#else 79static u8 dtl_mask; 80#endif 81 82void alloc_dtl_buffers(unsigned long *time_limit) 83{ 84 int cpu; 85 struct paca_struct *pp; 86 struct dtl_entry *dtl; 87 88 for_each_possible_cpu(cpu) { 89 pp = paca_ptrs[cpu]; 90 if (pp->dispatch_log) 91 continue; 92 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL); 93 if (!dtl) { 94 pr_warn("Failed to allocate dispatch trace log for cpu %d\n", 95 cpu); 96#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 97 pr_warn("Stolen time statistics will be unreliable\n"); 98#endif 99 break; 100 } 101 102 pp->dtl_ridx = 0; 103 pp->dispatch_log = dtl; 104 pp->dispatch_log_end = dtl + N_DISPATCH_LOG; 105 pp->dtl_curr = dtl; 106 107 if (time_limit && time_after(jiffies, *time_limit)) { 108 cond_resched(); 109 *time_limit = jiffies + HZ; 110 } 111 } 112} 113 114void register_dtl_buffer(int cpu) 115{ 116 long ret; 117 struct paca_struct *pp; 118 struct dtl_entry *dtl; 119 int hwcpu = get_hard_smp_processor_id(cpu); 120 121 pp = paca_ptrs[cpu]; 122 dtl = pp->dispatch_log; 123 if (dtl && dtl_mask) { 124 pp->dtl_ridx = 0; 125 pp->dtl_curr = dtl; 126 lppaca_of(cpu).dtl_idx = 0; 127 128 /* hypervisor reads buffer length from this field */ 129 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); 130 ret = register_dtl(hwcpu, __pa(dtl)); 131 if (ret) 132 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed with %ld\n", 133 cpu, hwcpu, ret); 134 135 lppaca_of(cpu).dtl_enable_mask = dtl_mask; 136 } 137} 138 139#ifdef CONFIG_PPC_SPLPAR 140struct dtl_worker { 141 struct delayed_work work; 142 int cpu; 143}; 144 145struct vcpu_dispatch_data { 146 int last_disp_cpu; 147 148 int total_disp; 149 150 int same_cpu_disp; 151 int same_chip_disp; 152 int diff_chip_disp; 153 int far_chip_disp; 154 155 int numa_home_disp; 156 int numa_remote_disp; 157 int numa_far_disp; 158}; 159 160/* 161 * This represents the number of cpus in the hypervisor. Since there is no 162 * architected way to discover the number of processors in the host, we 163 * provision for dealing with NR_CPUS. This is currently 2048 by default, and 164 * is sufficient for our purposes. This will need to be tweaked if 165 * CONFIG_NR_CPUS is changed. 166 */ 167#define NR_CPUS_H NR_CPUS 168 169DEFINE_RWLOCK(dtl_access_lock); 170static DEFINE_PER_CPU(struct vcpu_dispatch_data, vcpu_disp_data); 171static DEFINE_PER_CPU(u64, dtl_entry_ridx); 172static DEFINE_PER_CPU(struct dtl_worker, dtl_workers); 173static enum cpuhp_state dtl_worker_state; 174static DEFINE_MUTEX(dtl_enable_mutex); 175static int vcpudispatch_stats_on __read_mostly; 176static int vcpudispatch_stats_freq = 50; 177static __be32 *vcpu_associativity, *pcpu_associativity; 178 179 180static void free_dtl_buffers(unsigned long *time_limit) 181{ 182#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 183 int cpu; 184 struct paca_struct *pp; 185 186 for_each_possible_cpu(cpu) { 187 pp = paca_ptrs[cpu]; 188 if (!pp->dispatch_log) 189 continue; 190 kmem_cache_free(dtl_cache, pp->dispatch_log); 191 pp->dtl_ridx = 0; 192 pp->dispatch_log = 0; 193 pp->dispatch_log_end = 0; 194 pp->dtl_curr = 0; 195 196 if (time_limit && time_after(jiffies, *time_limit)) { 197 cond_resched(); 198 *time_limit = jiffies + HZ; 199 } 200 } 201#endif 202} 203 204static int init_cpu_associativity(void) 205{ 206 vcpu_associativity = kcalloc(num_possible_cpus() / threads_per_core, 207 VPHN_ASSOC_BUFSIZE * sizeof(__be32), GFP_KERNEL); 208 pcpu_associativity = kcalloc(NR_CPUS_H / threads_per_core, 209 VPHN_ASSOC_BUFSIZE * sizeof(__be32), GFP_KERNEL); 210 211 if (!vcpu_associativity || !pcpu_associativity) { 212 pr_err("error allocating memory for associativity information\n"); 213 return -ENOMEM; 214 } 215 216 return 0; 217} 218 219static void destroy_cpu_associativity(void) 220{ 221 kfree(vcpu_associativity); 222 kfree(pcpu_associativity); 223 vcpu_associativity = pcpu_associativity = 0; 224} 225 226static __be32 *__get_cpu_associativity(int cpu, __be32 *cpu_assoc, int flag) 227{ 228 __be32 *assoc; 229 int rc = 0; 230 231 assoc = &cpu_assoc[(int)(cpu / threads_per_core) * VPHN_ASSOC_BUFSIZE]; 232 if (!assoc[0]) { 233 rc = hcall_vphn(cpu, flag, &assoc[0]); 234 if (rc) 235 return NULL; 236 } 237 238 return assoc; 239} 240 241static __be32 *get_pcpu_associativity(int cpu) 242{ 243 return __get_cpu_associativity(cpu, pcpu_associativity, VPHN_FLAG_PCPU); 244} 245 246static __be32 *get_vcpu_associativity(int cpu) 247{ 248 return __get_cpu_associativity(cpu, vcpu_associativity, VPHN_FLAG_VCPU); 249} 250 251static int cpu_relative_dispatch_distance(int last_disp_cpu, int cur_disp_cpu) 252{ 253 __be32 *last_disp_cpu_assoc, *cur_disp_cpu_assoc; 254 255 if (last_disp_cpu >= NR_CPUS_H || cur_disp_cpu >= NR_CPUS_H) 256 return -EINVAL; 257 258 last_disp_cpu_assoc = get_pcpu_associativity(last_disp_cpu); 259 cur_disp_cpu_assoc = get_pcpu_associativity(cur_disp_cpu); 260 261 if (!last_disp_cpu_assoc || !cur_disp_cpu_assoc) 262 return -EIO; 263 264 return cpu_relative_distance(last_disp_cpu_assoc, cur_disp_cpu_assoc); 265} 266 267static int cpu_home_node_dispatch_distance(int disp_cpu) 268{ 269 __be32 *disp_cpu_assoc, *vcpu_assoc; 270 int vcpu_id = smp_processor_id(); 271 272 if (disp_cpu >= NR_CPUS_H) { 273 pr_debug_ratelimited("vcpu dispatch cpu %d > %d\n", 274 disp_cpu, NR_CPUS_H); 275 return -EINVAL; 276 } 277 278 disp_cpu_assoc = get_pcpu_associativity(disp_cpu); 279 vcpu_assoc = get_vcpu_associativity(vcpu_id); 280 281 if (!disp_cpu_assoc || !vcpu_assoc) 282 return -EIO; 283 284 return cpu_relative_distance(disp_cpu_assoc, vcpu_assoc); 285} 286 287static void update_vcpu_disp_stat(int disp_cpu) 288{ 289 struct vcpu_dispatch_data *disp; 290 int distance; 291 292 disp = this_cpu_ptr(&vcpu_disp_data); 293 if (disp->last_disp_cpu == -1) { 294 disp->last_disp_cpu = disp_cpu; 295 return; 296 } 297 298 disp->total_disp++; 299 300 if (disp->last_disp_cpu == disp_cpu || 301 (cpu_first_thread_sibling(disp->last_disp_cpu) == 302 cpu_first_thread_sibling(disp_cpu))) 303 disp->same_cpu_disp++; 304 else { 305 distance = cpu_relative_dispatch_distance(disp->last_disp_cpu, 306 disp_cpu); 307 if (distance < 0) 308 pr_debug_ratelimited("vcpudispatch_stats: cpu %d: error determining associativity\n", 309 smp_processor_id()); 310 else { 311 switch (distance) { 312 case 0: 313 disp->same_chip_disp++; 314 break; 315 case 1: 316 disp->diff_chip_disp++; 317 break; 318 case 2: 319 disp->far_chip_disp++; 320 break; 321 default: 322 pr_debug_ratelimited("vcpudispatch_stats: cpu %d (%d -> %d): unexpected relative dispatch distance %d\n", 323 smp_processor_id(), 324 disp->last_disp_cpu, 325 disp_cpu, 326 distance); 327 } 328 } 329 } 330 331 distance = cpu_home_node_dispatch_distance(disp_cpu); 332 if (distance < 0) 333 pr_debug_ratelimited("vcpudispatch_stats: cpu %d: error determining associativity\n", 334 smp_processor_id()); 335 else { 336 switch (distance) { 337 case 0: 338 disp->numa_home_disp++; 339 break; 340 case 1: 341 disp->numa_remote_disp++; 342 break; 343 case 2: 344 disp->numa_far_disp++; 345 break; 346 default: 347 pr_debug_ratelimited("vcpudispatch_stats: cpu %d on %d: unexpected numa dispatch distance %d\n", 348 smp_processor_id(), 349 disp_cpu, 350 distance); 351 } 352 } 353 354 disp->last_disp_cpu = disp_cpu; 355} 356 357static void process_dtl_buffer(struct work_struct *work) 358{ 359 struct dtl_entry dtle; 360 u64 i = __this_cpu_read(dtl_entry_ridx); 361 struct dtl_entry *dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG); 362 struct dtl_entry *dtl_end = local_paca->dispatch_log_end; 363 struct lppaca *vpa = local_paca->lppaca_ptr; 364 struct dtl_worker *d = container_of(work, struct dtl_worker, work.work); 365 366 if (!local_paca->dispatch_log) 367 return; 368 369 /* if we have been migrated away, we cancel ourself */ 370 if (d->cpu != smp_processor_id()) { 371 pr_debug("vcpudispatch_stats: cpu %d worker migrated -- canceling worker\n", 372 smp_processor_id()); 373 return; 374 } 375 376 if (i == be64_to_cpu(vpa->dtl_idx)) 377 goto out; 378 379 while (i < be64_to_cpu(vpa->dtl_idx)) { 380 dtle = *dtl; 381 barrier(); 382 if (i + N_DISPATCH_LOG < be64_to_cpu(vpa->dtl_idx)) { 383 /* buffer has overflowed */ 384 pr_debug_ratelimited("vcpudispatch_stats: cpu %d lost %lld DTL samples\n", 385 d->cpu, 386 be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG - i); 387 i = be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG; 388 dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG); 389 continue; 390 } 391 update_vcpu_disp_stat(be16_to_cpu(dtle.processor_id)); 392 ++i; 393 ++dtl; 394 if (dtl == dtl_end) 395 dtl = local_paca->dispatch_log; 396 } 397 398 __this_cpu_write(dtl_entry_ridx, i); 399 400out: 401 schedule_delayed_work_on(d->cpu, to_delayed_work(work), 402 HZ / vcpudispatch_stats_freq); 403} 404 405static int dtl_worker_online(unsigned int cpu) 406{ 407 struct dtl_worker *d = &per_cpu(dtl_workers, cpu); 408 409 memset(d, 0, sizeof(*d)); 410 INIT_DELAYED_WORK(&d->work, process_dtl_buffer); 411 d->cpu = cpu; 412 413#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 414 per_cpu(dtl_entry_ridx, cpu) = 0; 415 register_dtl_buffer(cpu); 416#else 417 per_cpu(dtl_entry_ridx, cpu) = be64_to_cpu(lppaca_of(cpu).dtl_idx); 418#endif 419 420 schedule_delayed_work_on(cpu, &d->work, HZ / vcpudispatch_stats_freq); 421 return 0; 422} 423 424static int dtl_worker_offline(unsigned int cpu) 425{ 426 struct dtl_worker *d = &per_cpu(dtl_workers, cpu); 427 428 cancel_delayed_work_sync(&d->work); 429 430#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 431 unregister_dtl(get_hard_smp_processor_id(cpu)); 432#endif 433 434 return 0; 435} 436 437static void set_global_dtl_mask(u8 mask) 438{ 439 int cpu; 440 441 dtl_mask = mask; 442 for_each_present_cpu(cpu) 443 lppaca_of(cpu).dtl_enable_mask = dtl_mask; 444} 445 446static void reset_global_dtl_mask(void) 447{ 448 int cpu; 449 450#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 451 dtl_mask = DTL_LOG_PREEMPT; 452#else 453 dtl_mask = 0; 454#endif 455 for_each_present_cpu(cpu) 456 lppaca_of(cpu).dtl_enable_mask = dtl_mask; 457} 458 459static int dtl_worker_enable(unsigned long *time_limit) 460{ 461 int rc = 0, state; 462 463 if (!write_trylock(&dtl_access_lock)) { 464 rc = -EBUSY; 465 goto out; 466 } 467 468 set_global_dtl_mask(DTL_LOG_ALL); 469 470 /* Setup dtl buffers and register those */ 471 alloc_dtl_buffers(time_limit); 472 473 state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powerpc/dtl:online", 474 dtl_worker_online, dtl_worker_offline); 475 if (state < 0) { 476 pr_err("vcpudispatch_stats: unable to setup workqueue for DTL processing\n"); 477 free_dtl_buffers(time_limit); 478 reset_global_dtl_mask(); 479 write_unlock(&dtl_access_lock); 480 rc = -EINVAL; 481 goto out; 482 } 483 dtl_worker_state = state; 484 485out: 486 return rc; 487} 488 489static void dtl_worker_disable(unsigned long *time_limit) 490{ 491 cpuhp_remove_state(dtl_worker_state); 492 free_dtl_buffers(time_limit); 493 reset_global_dtl_mask(); 494 write_unlock(&dtl_access_lock); 495} 496 497static ssize_t vcpudispatch_stats_write(struct file *file, const char __user *p, 498 size_t count, loff_t *ppos) 499{ 500 unsigned long time_limit = jiffies + HZ; 501 struct vcpu_dispatch_data *disp; 502 int rc, cmd, cpu; 503 char buf[16]; 504 505 if (count > 15) 506 return -EINVAL; 507 508 if (copy_from_user(buf, p, count)) 509 return -EFAULT; 510 511 buf[count] = 0; 512 rc = kstrtoint(buf, 0, &cmd); 513 if (rc || cmd < 0 || cmd > 1) { 514 pr_err("vcpudispatch_stats: please use 0 to disable or 1 to enable dispatch statistics\n"); 515 return rc ? rc : -EINVAL; 516 } 517 518 mutex_lock(&dtl_enable_mutex); 519 520 if ((cmd == 0 && !vcpudispatch_stats_on) || 521 (cmd == 1 && vcpudispatch_stats_on)) 522 goto out; 523 524 if (cmd) { 525 rc = init_cpu_associativity(); 526 if (rc) { 527 destroy_cpu_associativity(); 528 goto out; 529 } 530 531 for_each_possible_cpu(cpu) { 532 disp = per_cpu_ptr(&vcpu_disp_data, cpu); 533 memset(disp, 0, sizeof(*disp)); 534 disp->last_disp_cpu = -1; 535 } 536 537 rc = dtl_worker_enable(&time_limit); 538 if (rc) { 539 destroy_cpu_associativity(); 540 goto out; 541 } 542 } else { 543 dtl_worker_disable(&time_limit); 544 destroy_cpu_associativity(); 545 } 546 547 vcpudispatch_stats_on = cmd; 548 549out: 550 mutex_unlock(&dtl_enable_mutex); 551 if (rc) 552 return rc; 553 return count; 554} 555 556static int vcpudispatch_stats_display(struct seq_file *p, void *v) 557{ 558 int cpu; 559 struct vcpu_dispatch_data *disp; 560 561 if (!vcpudispatch_stats_on) { 562 seq_puts(p, "off\n"); 563 return 0; 564 } 565 566 for_each_online_cpu(cpu) { 567 disp = per_cpu_ptr(&vcpu_disp_data, cpu); 568 seq_printf(p, "cpu%d", cpu); 569 seq_put_decimal_ull(p, " ", disp->total_disp); 570 seq_put_decimal_ull(p, " ", disp->same_cpu_disp); 571 seq_put_decimal_ull(p, " ", disp->same_chip_disp); 572 seq_put_decimal_ull(p, " ", disp->diff_chip_disp); 573 seq_put_decimal_ull(p, " ", disp->far_chip_disp); 574 seq_put_decimal_ull(p, " ", disp->numa_home_disp); 575 seq_put_decimal_ull(p, " ", disp->numa_remote_disp); 576 seq_put_decimal_ull(p, " ", disp->numa_far_disp); 577 seq_puts(p, "\n"); 578 } 579 580 return 0; 581} 582 583static int vcpudispatch_stats_open(struct inode *inode, struct file *file) 584{ 585 return single_open(file, vcpudispatch_stats_display, NULL); 586} 587 588static const struct proc_ops vcpudispatch_stats_proc_ops = { 589 .proc_open = vcpudispatch_stats_open, 590 .proc_read = seq_read, 591 .proc_write = vcpudispatch_stats_write, 592 .proc_lseek = seq_lseek, 593 .proc_release = single_release, 594}; 595 596static ssize_t vcpudispatch_stats_freq_write(struct file *file, 597 const char __user *p, size_t count, loff_t *ppos) 598{ 599 int rc, freq; 600 char buf[16]; 601 602 if (count > 15) 603 return -EINVAL; 604 605 if (copy_from_user(buf, p, count)) 606 return -EFAULT; 607 608 buf[count] = 0; 609 rc = kstrtoint(buf, 0, &freq); 610 if (rc || freq < 1 || freq > HZ) { 611 pr_err("vcpudispatch_stats_freq: please specify a frequency between 1 and %d\n", 612 HZ); 613 return rc ? rc : -EINVAL; 614 } 615 616 vcpudispatch_stats_freq = freq; 617 618 return count; 619} 620 621static int vcpudispatch_stats_freq_display(struct seq_file *p, void *v) 622{ 623 seq_printf(p, "%d\n", vcpudispatch_stats_freq); 624 return 0; 625} 626 627static int vcpudispatch_stats_freq_open(struct inode *inode, struct file *file) 628{ 629 return single_open(file, vcpudispatch_stats_freq_display, NULL); 630} 631 632static const struct proc_ops vcpudispatch_stats_freq_proc_ops = { 633 .proc_open = vcpudispatch_stats_freq_open, 634 .proc_read = seq_read, 635 .proc_write = vcpudispatch_stats_freq_write, 636 .proc_lseek = seq_lseek, 637 .proc_release = single_release, 638}; 639 640static int __init vcpudispatch_stats_procfs_init(void) 641{ 642 if (!lppaca_shared_proc()) 643 return 0; 644 645 if (!proc_create("powerpc/vcpudispatch_stats", 0600, NULL, 646 &vcpudispatch_stats_proc_ops)) 647 pr_err("vcpudispatch_stats: error creating procfs file\n"); 648 else if (!proc_create("powerpc/vcpudispatch_stats_freq", 0600, NULL, 649 &vcpudispatch_stats_freq_proc_ops)) 650 pr_err("vcpudispatch_stats_freq: error creating procfs file\n"); 651 652 return 0; 653} 654 655machine_device_initcall(pseries, vcpudispatch_stats_procfs_init); 656#endif /* CONFIG_PPC_SPLPAR */ 657 658void vpa_init(int cpu) 659{ 660 int hwcpu = get_hard_smp_processor_id(cpu); 661 unsigned long addr; 662 long ret; 663 664 /* 665 * The spec says it "may be problematic" if CPU x registers the VPA of 666 * CPU y. We should never do that, but wail if we ever do. 667 */ 668 WARN_ON(cpu != smp_processor_id()); 669 670 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 671 lppaca_of(cpu).vmxregs_in_use = 1; 672 673 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 674 lppaca_of(cpu).ebb_regs_in_use = 1; 675 676 addr = __pa(&lppaca_of(cpu)); 677 ret = register_vpa(hwcpu, addr); 678 679 if (ret) { 680 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area " 681 "%lx failed with %ld\n", cpu, hwcpu, addr, ret); 682 return; 683 } 684 685#ifdef CONFIG_PPC_BOOK3S_64 686 /* 687 * PAPR says this feature is SLB-Buffer but firmware never 688 * reports that. All SPLPAR support SLB shadow buffer. 689 */ 690 if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) { 691 addr = __pa(paca_ptrs[cpu]->slb_shadow_ptr); 692 ret = register_slb_shadow(hwcpu, addr); 693 if (ret) 694 pr_err("WARNING: SLB shadow buffer registration for " 695 "cpu %d (hw %d) of area %lx failed with %ld\n", 696 cpu, hwcpu, addr, ret); 697 } 698#endif /* CONFIG_PPC_BOOK3S_64 */ 699 700 /* 701 * Register dispatch trace log, if one has been allocated. 702 */ 703 register_dtl_buffer(cpu); 704} 705 706#ifdef CONFIG_PPC_BOOK3S_64 707 708static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 709 unsigned long vpn, unsigned long pa, 710 unsigned long rflags, unsigned long vflags, 711 int psize, int apsize, int ssize) 712{ 713 unsigned long lpar_rc; 714 unsigned long flags; 715 unsigned long slot; 716 unsigned long hpte_v, hpte_r; 717 718 if (!(vflags & HPTE_V_BOLTED)) 719 pr_devel("hpte_insert(group=%lx, vpn=%016lx, " 720 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n", 721 hpte_group, vpn, pa, rflags, vflags, psize); 722 723 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID; 724 hpte_r = hpte_encode_r(pa, psize, apsize) | rflags; 725 726 if (!(vflags & HPTE_V_BOLTED)) 727 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 728 729 /* Now fill in the actual HPTE */ 730 /* Set CEC cookie to 0 */ 731 /* Zero page = 0 */ 732 /* I-cache Invalidate = 0 */ 733 /* I-cache synchronize = 0 */ 734 /* Exact = 0 */ 735 flags = 0; 736 737 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N)) 738 flags |= H_COALESCE_CAND; 739 740 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 741 if (unlikely(lpar_rc == H_PTEG_FULL)) { 742 pr_devel("Hash table group is full\n"); 743 return -1; 744 } 745 746 /* 747 * Since we try and ioremap PHBs we don't own, the pte insert 748 * will fail. However we must catch the failure in hash_page 749 * or we will loop forever, so return -2 in this case. 750 */ 751 if (unlikely(lpar_rc != H_SUCCESS)) { 752 pr_err("Failed hash pte insert with error %ld\n", lpar_rc); 753 return -2; 754 } 755 if (!(vflags & HPTE_V_BOLTED)) 756 pr_devel(" -> slot: %lu\n", slot & 7); 757 758 /* Because of iSeries, we have to pass down the secondary 759 * bucket bit here as well 760 */ 761 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 762} 763 764static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 765 766static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 767{ 768 unsigned long slot_offset; 769 unsigned long lpar_rc; 770 int i; 771 unsigned long dummy1, dummy2; 772 773 /* pick a random slot to start at */ 774 slot_offset = mftb() & 0x7; 775 776 for (i = 0; i < HPTES_PER_GROUP; i++) { 777 778 /* don't remove a bolted entry */ 779 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 780 HPTE_V_BOLTED, &dummy1, &dummy2); 781 if (lpar_rc == H_SUCCESS) 782 return i; 783 784 /* 785 * The test for adjunct partition is performed before the 786 * ANDCOND test. H_RESOURCE may be returned, so we need to 787 * check for that as well. 788 */ 789 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE); 790 791 slot_offset++; 792 slot_offset &= 0x7; 793 } 794 795 return -1; 796} 797 798static void manual_hpte_clear_all(void) 799{ 800 unsigned long size_bytes = 1UL << ppc64_pft_size; 801 unsigned long hpte_count = size_bytes >> 4; 802 struct { 803 unsigned long pteh; 804 unsigned long ptel; 805 } ptes[4]; 806 long lpar_rc; 807 unsigned long i, j; 808 809 /* Read in batches of 4, 810 * invalidate only valid entries not in the VRMA 811 * hpte_count will be a multiple of 4 812 */ 813 for (i = 0; i < hpte_count; i += 4) { 814 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); 815 if (lpar_rc != H_SUCCESS) { 816 pr_info("Failed to read hash page table at %ld err %ld\n", 817 i, lpar_rc); 818 continue; 819 } 820 for (j = 0; j < 4; j++){ 821 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == 822 HPTE_V_VRMA_MASK) 823 continue; 824 if (ptes[j].pteh & HPTE_V_VALID) 825 plpar_pte_remove_raw(0, i + j, 0, 826 &(ptes[j].pteh), &(ptes[j].ptel)); 827 } 828 } 829} 830 831static int hcall_hpte_clear_all(void) 832{ 833 int rc; 834 835 do { 836 rc = plpar_hcall_norets(H_CLEAR_HPT); 837 } while (rc == H_CONTINUE); 838 839 return rc; 840} 841 842static void pseries_hpte_clear_all(void) 843{ 844 int rc; 845 846 rc = hcall_hpte_clear_all(); 847 if (rc != H_SUCCESS) 848 manual_hpte_clear_all(); 849 850#ifdef __LITTLE_ENDIAN__ 851 /* 852 * Reset exceptions to big endian. 853 * 854 * FIXME this is a hack for kexec, we need to reset the exception 855 * endian before starting the new kernel and this is a convenient place 856 * to do it. 857 * 858 * This is also called on boot when a fadump happens. In that case we 859 * must not change the exception endian mode. 860 */ 861 if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) 862 pseries_big_endian_exceptions(); 863#endif 864} 865 866/* 867 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 868 * the low 3 bits of flags happen to line up. So no transform is needed. 869 * We can probably optimize here and assume the high bits of newpp are 870 * already zero. For now I am paranoid. 871 */ 872static long pSeries_lpar_hpte_updatepp(unsigned long slot, 873 unsigned long newpp, 874 unsigned long vpn, 875 int psize, int apsize, 876 int ssize, unsigned long inv_flags) 877{ 878 unsigned long lpar_rc; 879 unsigned long flags; 880 unsigned long want_v; 881 882 want_v = hpte_encode_avpn(vpn, psize, ssize); 883 884 flags = (newpp & 7) | H_AVPN; 885 if (mmu_has_feature(MMU_FTR_KERNEL_RO)) 886 /* Move pp0 into bit 8 (IBM 55) */ 887 flags |= (newpp & HPTE_R_PP0) >> 55; 888 889 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 890 want_v, slot, flags, psize); 891 892 lpar_rc = plpar_pte_protect(flags, slot, want_v); 893 894 if (lpar_rc == H_NOT_FOUND) { 895 pr_devel("not found !\n"); 896 return -1; 897 } 898 899 pr_devel("ok\n"); 900 901 BUG_ON(lpar_rc != H_SUCCESS); 902 903 return 0; 904} 905 906static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group) 907{ 908 long lpar_rc; 909 unsigned long i, j; 910 struct { 911 unsigned long pteh; 912 unsigned long ptel; 913 } ptes[4]; 914 915 for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) { 916 917 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes); 918 if (lpar_rc != H_SUCCESS) { 919 pr_info("Failed to read hash page table at %ld err %ld\n", 920 hpte_group, lpar_rc); 921 continue; 922 } 923 924 for (j = 0; j < 4; j++) { 925 if (HPTE_V_COMPARE(ptes[j].pteh, want_v) && 926 (ptes[j].pteh & HPTE_V_VALID)) 927 return i + j; 928 } 929 } 930 931 return -1; 932} 933 934static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) 935{ 936 long slot; 937 unsigned long hash; 938 unsigned long want_v; 939 unsigned long hpte_group; 940 941 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); 942 want_v = hpte_encode_avpn(vpn, psize, ssize); 943 944 /* 945 * We try to keep bolted entries always in primary hash 946 * But in some case we can find them in secondary too. 947 */ 948 hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP; 949 slot = __pSeries_lpar_hpte_find(want_v, hpte_group); 950 if (slot < 0) { 951 /* Try in secondary */ 952 hpte_group = (~hash & htab_hash_mask) * HPTES_PER_GROUP; 953 slot = __pSeries_lpar_hpte_find(want_v, hpte_group); 954 if (slot < 0) 955 return -1; 956 } 957 return hpte_group + slot; 958} 959 960static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 961 unsigned long ea, 962 int psize, int ssize) 963{ 964 unsigned long vpn; 965 unsigned long lpar_rc, slot, vsid, flags; 966 967 vsid = get_kernel_vsid(ea, ssize); 968 vpn = hpt_vpn(ea, vsid, ssize); 969 970 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 971 BUG_ON(slot == -1); 972 973 flags = newpp & 7; 974 if (mmu_has_feature(MMU_FTR_KERNEL_RO)) 975 /* Move pp0 into bit 8 (IBM 55) */ 976 flags |= (newpp & HPTE_R_PP0) >> 55; 977 978 lpar_rc = plpar_pte_protect(flags, slot, 0); 979 980 BUG_ON(lpar_rc != H_SUCCESS); 981} 982 983static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, 984 int psize, int apsize, 985 int ssize, int local) 986{ 987 unsigned long want_v; 988 unsigned long lpar_rc; 989 unsigned long dummy1, dummy2; 990 991 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n", 992 slot, vpn, psize, local); 993 994 want_v = hpte_encode_avpn(vpn, psize, ssize); 995 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 996 if (lpar_rc == H_NOT_FOUND) 997 return; 998 999 BUG_ON(lpar_rc != H_SUCCESS); 1000} 1001 1002 1003/* 1004 * As defined in the PAPR's section 14.5.4.1.8 1005 * The control mask doesn't include the returned reference and change bit from 1006 * the processed PTE. 1007 */ 1008#define HBLKR_AVPN 0x0100000000000000UL 1009#define HBLKR_CTRL_MASK 0xf800000000000000UL 1010#define HBLKR_CTRL_SUCCESS 0x8000000000000000UL 1011#define HBLKR_CTRL_ERRNOTFOUND 0x8800000000000000UL 1012#define HBLKR_CTRL_ERRBUSY 0xa000000000000000UL 1013 1014/* 1015 * Returned true if we are supporting this block size for the specified segment 1016 * base page size and actual page size. 1017 * 1018 * Currently, we only support 8 size block. 1019 */ 1020static inline bool is_supported_hlbkrm(int bpsize, int psize) 1021{ 1022 return (hblkrm_size[bpsize][psize] == HBLKRM_SUPPORTED_BLOCK_SIZE); 1023} 1024 1025/** 1026 * H_BLOCK_REMOVE caller. 1027 * @idx should point to the latest @param entry set with a PTEX. 1028 * If PTE cannot be processed because another CPUs has already locked that 1029 * group, those entries are put back in @param starting at index 1. 1030 * If entries has to be retried and @retry_busy is set to true, these entries 1031 * are retried until success. If @retry_busy is set to false, the returned 1032 * is the number of entries yet to process. 1033 */ 1034static unsigned long call_block_remove(unsigned long idx, unsigned long *param, 1035 bool retry_busy) 1036{ 1037 unsigned long i, rc, new_idx; 1038 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 1039 1040 if (idx < 2) { 1041 pr_warn("Unexpected empty call to H_BLOCK_REMOVE"); 1042 return 0; 1043 } 1044again: 1045 new_idx = 0; 1046 if (idx > PLPAR_HCALL9_BUFSIZE) { 1047 pr_err("Too many PTEs (%lu) for H_BLOCK_REMOVE", idx); 1048 idx = PLPAR_HCALL9_BUFSIZE; 1049 } else if (idx < PLPAR_HCALL9_BUFSIZE) 1050 param[idx] = HBR_END; 1051 1052 rc = plpar_hcall9(H_BLOCK_REMOVE, retbuf, 1053 param[0], /* AVA */ 1054 param[1], param[2], param[3], param[4], /* TS0-7 */ 1055 param[5], param[6], param[7], param[8]); 1056 if (rc == H_SUCCESS) 1057 return 0; 1058 1059 BUG_ON(rc != H_PARTIAL); 1060 1061 /* Check that the unprocessed entries were 'not found' or 'busy' */ 1062 for (i = 0; i < idx-1; i++) { 1063 unsigned long ctrl = retbuf[i] & HBLKR_CTRL_MASK; 1064 1065 if (ctrl == HBLKR_CTRL_ERRBUSY) { 1066 param[++new_idx] = param[i+1]; 1067 continue; 1068 } 1069 1070 BUG_ON(ctrl != HBLKR_CTRL_SUCCESS 1071 && ctrl != HBLKR_CTRL_ERRNOTFOUND); 1072 } 1073 1074 /* 1075 * If there were entries found busy, retry these entries if requested, 1076 * of if all the entries have to be retried. 1077 */ 1078 if (new_idx && (retry_busy || new_idx == (PLPAR_HCALL9_BUFSIZE-1))) { 1079 idx = new_idx + 1; 1080 goto again; 1081 } 1082 1083 return new_idx; 1084} 1085 1086#ifdef CONFIG_TRANSPARENT_HUGEPAGE 1087/* 1088 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need 1089 * to make sure that we avoid bouncing the hypervisor tlbie lock. 1090 */ 1091#define PPC64_HUGE_HPTE_BATCH 12 1092 1093static void hugepage_block_invalidate(unsigned long *slot, unsigned long *vpn, 1094 int count, int psize, int ssize) 1095{ 1096 unsigned long param[PLPAR_HCALL9_BUFSIZE]; 1097 unsigned long shift, current_vpgb, vpgb; 1098 int i, pix = 0; 1099 1100 shift = mmu_psize_defs[psize].shift; 1101 1102 for (i = 0; i < count; i++) { 1103 /* 1104 * Shifting 3 bits more on the right to get a 1105 * 8 pages aligned virtual addresse. 1106 */ 1107 vpgb = (vpn[i] >> (shift - VPN_SHIFT + 3)); 1108 if (!pix || vpgb != current_vpgb) { 1109 /* 1110 * Need to start a new 8 pages block, flush 1111 * the current one if needed. 1112 */ 1113 if (pix) 1114 (void)call_block_remove(pix, param, true); 1115 current_vpgb = vpgb; 1116 param[0] = hpte_encode_avpn(vpn[i], psize, ssize); 1117 pix = 1; 1118 } 1119 1120 param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot[i]; 1121 if (pix == PLPAR_HCALL9_BUFSIZE) { 1122 pix = call_block_remove(pix, param, false); 1123 /* 1124 * pix = 0 means that all the entries were 1125 * removed, we can start a new block. 1126 * Otherwise, this means that there are entries 1127 * to retry, and pix points to latest one, so 1128 * we should increment it and try to continue 1129 * the same block. 1130 */ 1131 if (pix) 1132 pix++; 1133 } 1134 } 1135 if (pix) 1136 (void)call_block_remove(pix, param, true); 1137} 1138 1139static void hugepage_bulk_invalidate(unsigned long *slot, unsigned long *vpn, 1140 int count, int psize, int ssize) 1141{ 1142 unsigned long param[PLPAR_HCALL9_BUFSIZE]; 1143 int i = 0, pix = 0, rc; 1144 1145 for (i = 0; i < count; i++) { 1146 1147 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 1148 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, 1149 ssize, 0); 1150 } else { 1151 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; 1152 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); 1153 pix += 2; 1154 if (pix == 8) { 1155 rc = plpar_hcall9(H_BULK_REMOVE, param, 1156 param[0], param[1], param[2], 1157 param[3], param[4], param[5], 1158 param[6], param[7]); 1159 BUG_ON(rc != H_SUCCESS); 1160 pix = 0; 1161 } 1162 } 1163 } 1164 if (pix) { 1165 param[pix] = HBR_END; 1166 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 1167 param[2], param[3], param[4], param[5], 1168 param[6], param[7]); 1169 BUG_ON(rc != H_SUCCESS); 1170 } 1171} 1172 1173static inline void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, 1174 unsigned long *vpn, 1175 int count, int psize, 1176 int ssize) 1177{ 1178 unsigned long flags = 0; 1179 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 1180 1181 if (lock_tlbie) 1182 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 1183 1184 /* Assuming THP size is 16M */ 1185 if (is_supported_hlbkrm(psize, MMU_PAGE_16M)) 1186 hugepage_block_invalidate(slot, vpn, count, psize, ssize); 1187 else 1188 hugepage_bulk_invalidate(slot, vpn, count, psize, ssize); 1189 1190 if (lock_tlbie) 1191 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 1192} 1193 1194static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 1195 unsigned long addr, 1196 unsigned char *hpte_slot_array, 1197 int psize, int ssize, int local) 1198{ 1199 int i, index = 0; 1200 unsigned long s_addr = addr; 1201 unsigned int max_hpte_count, valid; 1202 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH]; 1203 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH]; 1204 unsigned long shift, hidx, vpn = 0, hash, slot; 1205 1206 shift = mmu_psize_defs[psize].shift; 1207 max_hpte_count = 1U << (PMD_SHIFT - shift); 1208 1209 for (i = 0; i < max_hpte_count; i++) { 1210 valid = hpte_valid(hpte_slot_array, i); 1211 if (!valid) 1212 continue; 1213 hidx = hpte_hash_index(hpte_slot_array, i); 1214 1215 /* get the vpn */ 1216 addr = s_addr + (i * (1ul << shift)); 1217 vpn = hpt_vpn(addr, vsid, ssize); 1218 hash = hpt_hash(vpn, shift, ssize); 1219 if (hidx & _PTEIDX_SECONDARY) 1220 hash = ~hash; 1221 1222 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 1223 slot += hidx & _PTEIDX_GROUP_IX; 1224 1225 slot_array[index] = slot; 1226 vpn_array[index] = vpn; 1227 if (index == PPC64_HUGE_HPTE_BATCH - 1) { 1228 /* 1229 * Now do a bluk invalidate 1230 */ 1231 __pSeries_lpar_hugepage_invalidate(slot_array, 1232 vpn_array, 1233 PPC64_HUGE_HPTE_BATCH, 1234 psize, ssize); 1235 index = 0; 1236 } else 1237 index++; 1238 } 1239 if (index) 1240 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, 1241 index, psize, ssize); 1242} 1243#else 1244static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 1245 unsigned long addr, 1246 unsigned char *hpte_slot_array, 1247 int psize, int ssize, int local) 1248{ 1249 WARN(1, "%s called without THP support\n", __func__); 1250} 1251#endif 1252 1253static int pSeries_lpar_hpte_removebolted(unsigned long ea, 1254 int psize, int ssize) 1255{ 1256 unsigned long vpn; 1257 unsigned long slot, vsid; 1258 1259 vsid = get_kernel_vsid(ea, ssize); 1260 vpn = hpt_vpn(ea, vsid, ssize); 1261 1262 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 1263 if (slot == -1) 1264 return -ENOENT; 1265 1266 /* 1267 * lpar doesn't use the passed actual page size 1268 */ 1269 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); 1270 return 0; 1271} 1272 1273 1274static inline unsigned long compute_slot(real_pte_t pte, 1275 unsigned long vpn, 1276 unsigned long index, 1277 unsigned long shift, 1278 int ssize) 1279{ 1280 unsigned long slot, hash, hidx; 1281 1282 hash = hpt_hash(vpn, shift, ssize); 1283 hidx = __rpte_to_hidx(pte, index); 1284 if (hidx & _PTEIDX_SECONDARY) 1285 hash = ~hash; 1286 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 1287 slot += hidx & _PTEIDX_GROUP_IX; 1288 return slot; 1289} 1290 1291/** 1292 * The hcall H_BLOCK_REMOVE implies that the virtual pages to processed are 1293 * "all within the same naturally aligned 8 page virtual address block". 1294 */ 1295static void do_block_remove(unsigned long number, struct ppc64_tlb_batch *batch, 1296 unsigned long *param) 1297{ 1298 unsigned long vpn; 1299 unsigned long i, pix = 0; 1300 unsigned long index, shift, slot, current_vpgb, vpgb; 1301 real_pte_t pte; 1302 int psize, ssize; 1303 1304 psize = batch->psize; 1305 ssize = batch->ssize; 1306 1307 for (i = 0; i < number; i++) { 1308 vpn = batch->vpn[i]; 1309 pte = batch->pte[i]; 1310 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 1311 /* 1312 * Shifting 3 bits more on the right to get a 1313 * 8 pages aligned virtual addresse. 1314 */ 1315 vpgb = (vpn >> (shift - VPN_SHIFT + 3)); 1316 if (!pix || vpgb != current_vpgb) { 1317 /* 1318 * Need to start a new 8 pages block, flush 1319 * the current one if needed. 1320 */ 1321 if (pix) 1322 (void)call_block_remove(pix, param, 1323 true); 1324 current_vpgb = vpgb; 1325 param[0] = hpte_encode_avpn(vpn, psize, 1326 ssize); 1327 pix = 1; 1328 } 1329 1330 slot = compute_slot(pte, vpn, index, shift, ssize); 1331 param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot; 1332 1333 if (pix == PLPAR_HCALL9_BUFSIZE) { 1334 pix = call_block_remove(pix, param, false); 1335 /* 1336 * pix = 0 means that all the entries were 1337 * removed, we can start a new block. 1338 * Otherwise, this means that there are entries 1339 * to retry, and pix points to latest one, so 1340 * we should increment it and try to continue 1341 * the same block. 1342 */ 1343 if (pix) 1344 pix++; 1345 } 1346 } pte_iterate_hashed_end(); 1347 } 1348 1349 if (pix) 1350 (void)call_block_remove(pix, param, true); 1351} 1352 1353/* 1354 * TLB Block Invalidate Characteristics 1355 * 1356 * These characteristics define the size of the block the hcall H_BLOCK_REMOVE 1357 * is able to process for each couple segment base page size, actual page size. 1358 * 1359 * The ibm,get-system-parameter properties is returning a buffer with the 1360 * following layout: 1361 * 1362 * [ 2 bytes size of the RTAS buffer (excluding these 2 bytes) ] 1363 * ----------------- 1364 * TLB Block Invalidate Specifiers: 1365 * [ 1 byte LOG base 2 of the TLB invalidate block size being specified ] 1366 * [ 1 byte Number of page sizes (N) that are supported for the specified 1367 * TLB invalidate block size ] 1368 * [ 1 byte Encoded segment base page size and actual page size 1369 * MSB=0 means 4k segment base page size and actual page size 1370 * MSB=1 the penc value in mmu_psize_def ] 1371 * ... 1372 * ----------------- 1373 * Next TLB Block Invalidate Specifiers... 1374 * ----------------- 1375 * [ 0 ] 1376 */ 1377static inline void set_hblkrm_bloc_size(int bpsize, int psize, 1378 unsigned int block_size) 1379{ 1380 if (block_size > hblkrm_size[bpsize][psize]) 1381 hblkrm_size[bpsize][psize] = block_size; 1382} 1383 1384/* 1385 * Decode the Encoded segment base page size and actual page size. 1386 * PAPR specifies: 1387 * - bit 7 is the L bit 1388 * - bits 0-5 are the penc value 1389 * If the L bit is 0, this means 4K segment base page size and actual page size 1390 * otherwise the penc value should be read. 1391 */ 1392#define HBLKRM_L_MASK 0x80 1393#define HBLKRM_PENC_MASK 0x3f 1394static inline void __init check_lp_set_hblkrm(unsigned int lp, 1395 unsigned int block_size) 1396{ 1397 unsigned int bpsize, psize; 1398 1399 /* First, check the L bit, if not set, this means 4K */ 1400 if ((lp & HBLKRM_L_MASK) == 0) { 1401 set_hblkrm_bloc_size(MMU_PAGE_4K, MMU_PAGE_4K, block_size); 1402 return; 1403 } 1404 1405 lp &= HBLKRM_PENC_MASK; 1406 for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++) { 1407 struct mmu_psize_def *def = &mmu_psize_defs[bpsize]; 1408 1409 for (psize = 0; psize < MMU_PAGE_COUNT; psize++) { 1410 if (def->penc[psize] == lp) { 1411 set_hblkrm_bloc_size(bpsize, psize, block_size); 1412 return; 1413 } 1414 } 1415 } 1416} 1417 1418#define SPLPAR_TLB_BIC_TOKEN 50 1419 1420/* 1421 * The size of the TLB Block Invalidate Characteristics is variable. But at the 1422 * maximum it will be the number of possible page sizes *2 + 10 bytes. 1423 * Currently MMU_PAGE_COUNT is 16, which means 42 bytes. Use a cache line size 1424 * (128 bytes) for the buffer to get plenty of space. 1425 */ 1426#define SPLPAR_TLB_BIC_MAXLENGTH 128 1427 1428void __init pseries_lpar_read_hblkrm_characteristics(void) 1429{ 1430 const s32 token = rtas_token("ibm,get-system-parameter"); 1431 unsigned char local_buffer[SPLPAR_TLB_BIC_MAXLENGTH]; 1432 int call_status, len, idx, bpsize; 1433 1434 if (!firmware_has_feature(FW_FEATURE_BLOCK_REMOVE)) 1435 return; 1436 1437 do { 1438 spin_lock(&rtas_data_buf_lock); 1439 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 1440 call_status = rtas_call(token, 3, 1, NULL, SPLPAR_TLB_BIC_TOKEN, 1441 __pa(rtas_data_buf), RTAS_DATA_BUF_SIZE); 1442 memcpy(local_buffer, rtas_data_buf, SPLPAR_TLB_BIC_MAXLENGTH); 1443 local_buffer[SPLPAR_TLB_BIC_MAXLENGTH - 1] = '\0'; 1444 spin_unlock(&rtas_data_buf_lock); 1445 } while (rtas_busy_delay(call_status)); 1446 1447 if (call_status != 0) { 1448 pr_warn("%s %s Error calling get-system-parameter (0x%x)\n", 1449 __FILE__, __func__, call_status); 1450 return; 1451 } 1452 1453 /* 1454 * The first two (2) bytes of the data in the buffer are the length of 1455 * the returned data, not counting these first two (2) bytes. 1456 */ 1457 len = be16_to_cpu(*((u16 *)local_buffer)) + 2; 1458 if (len > SPLPAR_TLB_BIC_MAXLENGTH) { 1459 pr_warn("%s too large returned buffer %d", __func__, len); 1460 return; 1461 } 1462 1463 idx = 2; 1464 while (idx < len) { 1465 u8 block_shift = local_buffer[idx++]; 1466 u32 block_size; 1467 unsigned int npsize; 1468 1469 if (!block_shift) 1470 break; 1471 1472 block_size = 1 << block_shift; 1473 1474 for (npsize = local_buffer[idx++]; 1475 npsize > 0 && idx < len; npsize--) 1476 check_lp_set_hblkrm((unsigned int) local_buffer[idx++], 1477 block_size); 1478 } 1479 1480 for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++) 1481 for (idx = 0; idx < MMU_PAGE_COUNT; idx++) 1482 if (hblkrm_size[bpsize][idx]) 1483 pr_info("H_BLOCK_REMOVE supports base psize:%d psize:%d block size:%d", 1484 bpsize, idx, hblkrm_size[bpsize][idx]); 1485} 1486 1487/* 1488 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 1489 * lock. 1490 */ 1491static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 1492{ 1493 unsigned long vpn; 1494 unsigned long i, pix, rc; 1495 unsigned long flags = 0; 1496 struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch); 1497 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 1498 unsigned long param[PLPAR_HCALL9_BUFSIZE]; 1499 unsigned long index, shift, slot; 1500 real_pte_t pte; 1501 int psize, ssize; 1502 1503 if (lock_tlbie) 1504 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 1505 1506 if (is_supported_hlbkrm(batch->psize, batch->psize)) { 1507 do_block_remove(number, batch, param); 1508 goto out; 1509 } 1510 1511 psize = batch->psize; 1512 ssize = batch->ssize; 1513 pix = 0; 1514 for (i = 0; i < number; i++) { 1515 vpn = batch->vpn[i]; 1516 pte = batch->pte[i]; 1517 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 1518 slot = compute_slot(pte, vpn, index, shift, ssize); 1519 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 1520 /* 1521 * lpar doesn't use the passed actual page size 1522 */ 1523 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 1524 0, ssize, local); 1525 } else { 1526 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 1527 param[pix+1] = hpte_encode_avpn(vpn, psize, 1528 ssize); 1529 pix += 2; 1530 if (pix == 8) { 1531 rc = plpar_hcall9(H_BULK_REMOVE, param, 1532 param[0], param[1], param[2], 1533 param[3], param[4], param[5], 1534 param[6], param[7]); 1535 BUG_ON(rc != H_SUCCESS); 1536 pix = 0; 1537 } 1538 } 1539 } pte_iterate_hashed_end(); 1540 } 1541 if (pix) { 1542 param[pix] = HBR_END; 1543 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 1544 param[2], param[3], param[4], param[5], 1545 param[6], param[7]); 1546 BUG_ON(rc != H_SUCCESS); 1547 } 1548 1549out: 1550 if (lock_tlbie) 1551 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 1552} 1553 1554static int __init disable_bulk_remove(char *str) 1555{ 1556 if (strcmp(str, "off") == 0 && 1557 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 1558 pr_info("Disabling BULK_REMOVE firmware feature"); 1559 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; 1560 } 1561 return 1; 1562} 1563 1564__setup("bulk_remove=", disable_bulk_remove); 1565 1566#define HPT_RESIZE_TIMEOUT 10000 /* ms */ 1567 1568struct hpt_resize_state { 1569 unsigned long shift; 1570 int commit_rc; 1571}; 1572 1573static int pseries_lpar_resize_hpt_commit(void *data) 1574{ 1575 struct hpt_resize_state *state = data; 1576 1577 state->commit_rc = plpar_resize_hpt_commit(0, state->shift); 1578 if (state->commit_rc != H_SUCCESS) 1579 return -EIO; 1580 1581 /* Hypervisor has transitioned the HTAB, update our globals */ 1582 ppc64_pft_size = state->shift; 1583 htab_size_bytes = 1UL << ppc64_pft_size; 1584 htab_hash_mask = (htab_size_bytes >> 7) - 1; 1585 1586 return 0; 1587} 1588 1589/* 1590 * Must be called in process context. The caller must hold the 1591 * cpus_lock. 1592 */ 1593static int pseries_lpar_resize_hpt(unsigned long shift) 1594{ 1595 struct hpt_resize_state state = { 1596 .shift = shift, 1597 .commit_rc = H_FUNCTION, 1598 }; 1599 unsigned int delay, total_delay = 0; 1600 int rc; 1601 ktime_t t0, t1, t2; 1602 1603 might_sleep(); 1604 1605 if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE)) 1606 return -ENODEV; 1607 1608 pr_info("Attempting to resize HPT to shift %lu\n", shift); 1609 1610 t0 = ktime_get(); 1611 1612 rc = plpar_resize_hpt_prepare(0, shift); 1613 while (H_IS_LONG_BUSY(rc)) { 1614 delay = get_longbusy_msecs(rc); 1615 total_delay += delay; 1616 if (total_delay > HPT_RESIZE_TIMEOUT) { 1617 /* prepare with shift==0 cancels an in-progress resize */ 1618 rc = plpar_resize_hpt_prepare(0, 0); 1619 if (rc != H_SUCCESS) 1620 pr_warn("Unexpected error %d cancelling timed out HPT resize\n", 1621 rc); 1622 return -ETIMEDOUT; 1623 } 1624 msleep(delay); 1625 rc = plpar_resize_hpt_prepare(0, shift); 1626 }; 1627 1628 switch (rc) { 1629 case H_SUCCESS: 1630 /* Continue on */ 1631 break; 1632 1633 case H_PARAMETER: 1634 pr_warn("Invalid argument from H_RESIZE_HPT_PREPARE\n"); 1635 return -EINVAL; 1636 case H_RESOURCE: 1637 pr_warn("Operation not permitted from H_RESIZE_HPT_PREPARE\n"); 1638 return -EPERM; 1639 default: 1640 pr_warn("Unexpected error %d from H_RESIZE_HPT_PREPARE\n", rc); 1641 return -EIO; 1642 } 1643 1644 t1 = ktime_get(); 1645 1646 rc = stop_machine_cpuslocked(pseries_lpar_resize_hpt_commit, 1647 &state, NULL); 1648 1649 t2 = ktime_get(); 1650 1651 if (rc != 0) { 1652 switch (state.commit_rc) { 1653 case H_PTEG_FULL: 1654 return -ENOSPC; 1655 1656 default: 1657 pr_warn("Unexpected error %d from H_RESIZE_HPT_COMMIT\n", 1658 state.commit_rc); 1659 return -EIO; 1660 }; 1661 } 1662 1663 pr_info("HPT resize to shift %lu complete (%lld ms / %lld ms)\n", 1664 shift, (long long) ktime_ms_delta(t1, t0), 1665 (long long) ktime_ms_delta(t2, t1)); 1666 1667 return 0; 1668} 1669 1670static int pseries_lpar_register_process_table(unsigned long base, 1671 unsigned long page_size, unsigned long table_size) 1672{ 1673 long rc; 1674 unsigned long flags = 0; 1675 1676 if (table_size) 1677 flags |= PROC_TABLE_NEW; 1678 if (radix_enabled()) { 1679 flags |= PROC_TABLE_RADIX; 1680 if (mmu_has_feature(MMU_FTR_GTSE)) 1681 flags |= PROC_TABLE_GTSE; 1682 } else 1683 flags |= PROC_TABLE_HPT_SLB; 1684 for (;;) { 1685 rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base, 1686 page_size, table_size); 1687 if (!H_IS_LONG_BUSY(rc)) 1688 break; 1689 mdelay(get_longbusy_msecs(rc)); 1690 } 1691 if (rc != H_SUCCESS) { 1692 pr_err("Failed to register process table (rc=%ld)\n", rc); 1693 BUG(); 1694 } 1695 return rc; 1696} 1697 1698void __init hpte_init_pseries(void) 1699{ 1700 mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate; 1701 mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp; 1702 mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 1703 mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert; 1704 mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove; 1705 mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted; 1706 mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range; 1707 mmu_hash_ops.hpte_clear_all = pseries_hpte_clear_all; 1708 mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; 1709 1710 if (firmware_has_feature(FW_FEATURE_HPT_RESIZE)) 1711 mmu_hash_ops.resize_hpt = pseries_lpar_resize_hpt; 1712 1713 /* 1714 * On POWER9, we need to do a H_REGISTER_PROC_TBL hcall 1715 * to inform the hypervisor that we wish to use the HPT. 1716 */ 1717 if (cpu_has_feature(CPU_FTR_ARCH_300)) 1718 pseries_lpar_register_process_table(0, 0, 0); 1719} 1720 1721#ifdef CONFIG_PPC_RADIX_MMU 1722void radix_init_pseries(void) 1723{ 1724 pr_info("Using radix MMU under hypervisor\n"); 1725 1726 pseries_lpar_register_process_table(__pa(process_tb), 1727 0, PRTB_SIZE_SHIFT - 12); 1728} 1729#endif 1730 1731#ifdef CONFIG_PPC_SMLPAR 1732#define CMO_FREE_HINT_DEFAULT 1 1733static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 1734 1735static int __init cmo_free_hint(char *str) 1736{ 1737 char *parm; 1738 parm = strstrip(str); 1739 1740 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 1741 pr_info("%s: CMO free page hinting is not active.\n", __func__); 1742 cmo_free_hint_flag = 0; 1743 return 1; 1744 } 1745 1746 cmo_free_hint_flag = 1; 1747 pr_info("%s: CMO free page hinting is active.\n", __func__); 1748 1749 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 1750 return 1; 1751 1752 return 0; 1753} 1754 1755__setup("cmo_free_hint=", cmo_free_hint); 1756 1757static void pSeries_set_page_state(struct page *page, int order, 1758 unsigned long state) 1759{ 1760 int i, j; 1761 unsigned long cmo_page_sz, addr; 1762 1763 cmo_page_sz = cmo_get_page_size(); 1764 addr = __pa((unsigned long)page_address(page)); 1765 1766 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 1767 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 1768 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 1769 } 1770} 1771 1772void arch_free_page(struct page *page, int order) 1773{ 1774 if (radix_enabled()) 1775 return; 1776 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 1777 return; 1778 1779 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 1780} 1781EXPORT_SYMBOL(arch_free_page); 1782 1783#endif /* CONFIG_PPC_SMLPAR */ 1784#endif /* CONFIG_PPC_BOOK3S_64 */ 1785 1786#ifdef CONFIG_TRACEPOINTS 1787#ifdef CONFIG_JUMP_LABEL 1788struct static_key hcall_tracepoint_key = STATIC_KEY_INIT; 1789 1790int hcall_tracepoint_regfunc(void) 1791{ 1792 static_key_slow_inc(&hcall_tracepoint_key); 1793 return 0; 1794} 1795 1796void hcall_tracepoint_unregfunc(void) 1797{ 1798 static_key_slow_dec(&hcall_tracepoint_key); 1799} 1800#else 1801/* 1802 * We optimise our hcall path by placing hcall_tracepoint_refcount 1803 * directly in the TOC so we can check if the hcall tracepoints are 1804 * enabled via a single load. 1805 */ 1806 1807/* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 1808extern long hcall_tracepoint_refcount; 1809 1810int hcall_tracepoint_regfunc(void) 1811{ 1812 hcall_tracepoint_refcount++; 1813 return 0; 1814} 1815 1816void hcall_tracepoint_unregfunc(void) 1817{ 1818 hcall_tracepoint_refcount--; 1819} 1820#endif 1821 1822/* 1823 * Since the tracing code might execute hcalls we need to guard against 1824 * recursion. 1825 */ 1826static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); 1827 1828 1829void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 1830{ 1831 unsigned long flags; 1832 unsigned int *depth; 1833 1834 /* 1835 * We cannot call tracepoints inside RCU idle regions which 1836 * means we must not trace H_CEDE. 1837 */ 1838 if (opcode == H_CEDE) 1839 return; 1840 1841 local_irq_save(flags); 1842 1843 depth = this_cpu_ptr(&hcall_trace_depth); 1844 1845 if (*depth) 1846 goto out; 1847 1848 (*depth)++; 1849 preempt_disable(); 1850 trace_hcall_entry(opcode, args); 1851 (*depth)--; 1852 1853out: 1854 local_irq_restore(flags); 1855} 1856 1857void __trace_hcall_exit(long opcode, long retval, unsigned long *retbuf) 1858{ 1859 unsigned long flags; 1860 unsigned int *depth; 1861 1862 if (opcode == H_CEDE) 1863 return; 1864 1865 local_irq_save(flags); 1866 1867 depth = this_cpu_ptr(&hcall_trace_depth); 1868 1869 if (*depth) 1870 goto out; 1871 1872 (*depth)++; 1873 trace_hcall_exit(opcode, retval, retbuf); 1874 preempt_enable(); 1875 (*depth)--; 1876 1877out: 1878 local_irq_restore(flags); 1879} 1880#endif 1881 1882/** 1883 * h_get_mpp 1884 * H_GET_MPP hcall returns info in 7 parms 1885 */ 1886int h_get_mpp(struct hvcall_mpp_data *mpp_data) 1887{ 1888 int rc; 1889 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 1890 1891 rc = plpar_hcall9(H_GET_MPP, retbuf); 1892 1893 mpp_data->entitled_mem = retbuf[0]; 1894 mpp_data->mapped_mem = retbuf[1]; 1895 1896 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; 1897 mpp_data->pool_num = retbuf[2] & 0xffff; 1898 1899 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; 1900 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; 1901 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; 1902 1903 mpp_data->pool_size = retbuf[4]; 1904 mpp_data->loan_request = retbuf[5]; 1905 mpp_data->backing_mem = retbuf[6]; 1906 1907 return rc; 1908} 1909EXPORT_SYMBOL(h_get_mpp); 1910 1911int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) 1912{ 1913 int rc; 1914 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; 1915 1916 rc = plpar_hcall9(H_GET_MPP_X, retbuf); 1917 1918 mpp_x_data->coalesced_bytes = retbuf[0]; 1919 mpp_x_data->pool_coalesced_bytes = retbuf[1]; 1920 mpp_x_data->pool_purr_cycles = retbuf[2]; 1921 mpp_x_data->pool_spurr_cycles = retbuf[3]; 1922 1923 return rc; 1924} 1925 1926static unsigned long vsid_unscramble(unsigned long vsid, int ssize) 1927{ 1928 unsigned long protovsid; 1929 unsigned long va_bits = VA_BITS; 1930 unsigned long modinv, vsid_modulus; 1931 unsigned long max_mod_inv, tmp_modinv; 1932 1933 if (!mmu_has_feature(MMU_FTR_68_BIT_VA)) 1934 va_bits = 65; 1935 1936 if (ssize == MMU_SEGSIZE_256M) { 1937 modinv = VSID_MULINV_256M; 1938 vsid_modulus = ((1UL << (va_bits - SID_SHIFT)) - 1); 1939 } else { 1940 modinv = VSID_MULINV_1T; 1941 vsid_modulus = ((1UL << (va_bits - SID_SHIFT_1T)) - 1); 1942 } 1943 1944 /* 1945 * vsid outside our range. 1946 */ 1947 if (vsid >= vsid_modulus) 1948 return 0; 1949 1950 /* 1951 * If modinv is the modular multiplicate inverse of (x % vsid_modulus) 1952 * and vsid = (protovsid * x) % vsid_modulus, then we say: 1953 * protovsid = (vsid * modinv) % vsid_modulus 1954 */ 1955 1956 /* Check if (vsid * modinv) overflow (63 bits) */ 1957 max_mod_inv = 0x7fffffffffffffffull / vsid; 1958 if (modinv < max_mod_inv) 1959 return (vsid * modinv) % vsid_modulus; 1960 1961 tmp_modinv = modinv/max_mod_inv; 1962 modinv %= max_mod_inv; 1963 1964 protovsid = (((vsid * max_mod_inv) % vsid_modulus) * tmp_modinv) % vsid_modulus; 1965 protovsid = (protovsid + vsid * modinv) % vsid_modulus; 1966 1967 return protovsid; 1968} 1969 1970static int __init reserve_vrma_context_id(void) 1971{ 1972 unsigned long protovsid; 1973 1974 /* 1975 * Reserve context ids which map to reserved virtual addresses. For now 1976 * we only reserve the context id which maps to the VRMA VSID. We ignore 1977 * the addresses in "ibm,adjunct-virtual-addresses" because we don't 1978 * enable adjunct support via the "ibm,client-architecture-support" 1979 * interface. 1980 */ 1981 protovsid = vsid_unscramble(VRMA_VSID, MMU_SEGSIZE_1T); 1982 hash__reserve_context_id(protovsid >> ESID_BITS_1T); 1983 return 0; 1984} 1985machine_device_initcall(pseries, reserve_vrma_context_id); 1986 1987#ifdef CONFIG_DEBUG_FS 1988/* debugfs file interface for vpa data */ 1989static ssize_t vpa_file_read(struct file *filp, char __user *buf, size_t len, 1990 loff_t *pos) 1991{ 1992 int cpu = (long)filp->private_data; 1993 struct lppaca *lppaca = &lppaca_of(cpu); 1994 1995 return simple_read_from_buffer(buf, len, pos, lppaca, 1996 sizeof(struct lppaca)); 1997} 1998 1999static const struct file_operations vpa_fops = { 2000 .open = simple_open, 2001 .read = vpa_file_read, 2002 .llseek = default_llseek, 2003}; 2004 2005static int __init vpa_debugfs_init(void) 2006{ 2007 char name[16]; 2008 long i; 2009 struct dentry *vpa_dir; 2010 2011 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 2012 return 0; 2013 2014 vpa_dir = debugfs_create_dir("vpa", powerpc_debugfs_root); 2015 2016 /* set up the per-cpu vpa file*/ 2017 for_each_possible_cpu(i) { 2018 sprintf(name, "cpu-%ld", i); 2019 debugfs_create_file(name, 0400, vpa_dir, (void *)i, &vpa_fops); 2020 } 2021 2022 return 0; 2023} 2024machine_arch_initcall(pseries, vpa_debugfs_init); 2025#endif /* CONFIG_DEBUG_FS */ 2026