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 */ 56 EXPORT_SYMBOL(plpar_hcall); 57 EXPORT_SYMBOL(plpar_hcall9); 58 EXPORT_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 */ 67 static 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 77 static u8 dtl_mask = DTL_LOG_PREEMPT; 78 #else 79 static u8 dtl_mask; 80 #endif 81 82 void 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 } 113 114 void 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 140 struct dtl_worker { 141 struct delayed_work work; 142 int cpu; 143 }; 144 145 struct 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 168 169 DEFINE_RWLOCK(dtl_access_lock); 170 static DEFINE_PER_CPU(struct vcpu_dispatch_data, vcpu_disp_data); 171 static DEFINE_PER_CPU(u64, dtl_entry_ridx); 172 static DEFINE_PER_CPU(struct dtl_worker, dtl_workers); 173 static enum cpuhp_state dtl_worker_state; 174 static DEFINE_MUTEX(dtl_enable_mutex); 175 static int vcpudispatch_stats_on __read_mostly; 176 static int vcpudispatch_stats_freq = 50; 177 static __be32 *vcpu_associativity, *pcpu_associativity; 178 179 180 static 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 } 203 204 static 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 } 218 219 static void destroy_cpu_associativity(void) 220 { 221 kfree(vcpu_associativity); 222 kfree(pcpu_associativity); 223 vcpu_associativity = pcpu_associativity = 0; 224 } 225 226 static __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 } 240 241 static __be32 *get_pcpu_associativity(int cpu) 242 { 243 return __get_cpu_associativity(cpu, pcpu_associativity, VPHN_FLAG_PCPU); 244 } 245 246 static __be32 *get_vcpu_associativity(int cpu) 247 { 248 return __get_cpu_associativity(cpu, vcpu_associativity, VPHN_FLAG_VCPU); 249 } 250 251 static 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_distance(last_disp_cpu_assoc, cur_disp_cpu_assoc); 265 } 266 267 static 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_distance(disp_cpu_assoc, vcpu_assoc); 285 } 286 287 static 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 } 356 357 static 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); 399 400 out: 401 schedule_delayed_work_on(d->cpu, to_delayed_work(work), 402 HZ / vcpudispatch_stats_freq); 403 } 404 405 static 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 } 423 424 static 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 } 436 437 static 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 } 445 446 static 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 } 458 459 static 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; 484 485 out: 486 return rc; 487 } 488 489 static 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 } 496 497 static 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 goto out; 528 529 for_each_possible_cpu(cpu) { 530 disp = per_cpu_ptr(&vcpu_disp_data, cpu); 531 memset(disp, 0, sizeof(*disp)); 532 disp->last_disp_cpu = -1; 533 } 534 535 rc = dtl_worker_enable(&time_limit); 536 if (rc) { 537 destroy_cpu_associativity(); 538 goto out; 539 } 540 } else { 541 dtl_worker_disable(&time_limit); 542 destroy_cpu_associativity(); 543 } 544 545 vcpudispatch_stats_on = cmd; 546 547 out: 548 mutex_unlock(&dtl_enable_mutex); 549 if (rc) 550 return rc; 551 return count; 552 } 553 554 static int vcpudispatch_stats_display(struct seq_file *p, void *v) 555 { 556 int cpu; 557 struct vcpu_dispatch_data *disp; 558 559 if (!vcpudispatch_stats_on) { 560 seq_puts(p, "off\n"); 561 return 0; 562 } 563 564 for_each_online_cpu(cpu) { 565 disp = per_cpu_ptr(&vcpu_disp_data, cpu); 566 seq_printf(p, "cpu%d", cpu); 567 seq_put_decimal_ull(p, " ", disp->total_disp); 568 seq_put_decimal_ull(p, " ", disp->same_cpu_disp); 569 seq_put_decimal_ull(p, " ", disp->same_chip_disp); 570 seq_put_decimal_ull(p, " ", disp->diff_chip_disp); 571 seq_put_decimal_ull(p, " ", disp->far_chip_disp); 572 seq_put_decimal_ull(p, " ", disp->numa_home_disp); 573 seq_put_decimal_ull(p, " ", disp->numa_remote_disp); 574 seq_put_decimal_ull(p, " ", disp->numa_far_disp); 575 seq_puts(p, "\n"); 576 } 577 578 return 0; 579 } 580 581 static int vcpudispatch_stats_open(struct inode *inode, struct file *file) 582 { 583 return single_open(file, vcpudispatch_stats_display, NULL); 584 } 585 586 static const struct proc_ops vcpudispatch_stats_proc_ops = { 587 .proc_open = vcpudispatch_stats_open, 588 .proc_read = seq_read, 589 .proc_write = vcpudispatch_stats_write, 590 .proc_lseek = seq_lseek, 591 .proc_release = single_release, 592 }; 593 594 static ssize_t vcpudispatch_stats_freq_write(struct file *file, 595 const char __user *p, size_t count, loff_t *ppos) 596 { 597 int rc, freq; 598 char buf[16]; 599 600 if (count > 15) 601 return -EINVAL; 602 603 if (copy_from_user(buf, p, count)) 604 return -EFAULT; 605 606 buf[count] = 0; 607 rc = kstrtoint(buf, 0, &freq); 608 if (rc || freq < 1 || freq > HZ) { 609 pr_err("vcpudispatch_stats_freq: please specify a frequency between 1 and %d\n", 610 HZ); 611 return rc ? rc : -EINVAL; 612 } 613 614 vcpudispatch_stats_freq = freq; 615 616 return count; 617 } 618 619 static int vcpudispatch_stats_freq_display(struct seq_file *p, void *v) 620 { 621 seq_printf(p, "%d\n", vcpudispatch_stats_freq); 622 return 0; 623 } 624 625 static int vcpudispatch_stats_freq_open(struct inode *inode, struct file *file) 626 { 627 return single_open(file, vcpudispatch_stats_freq_display, NULL); 628 } 629 630 static const struct proc_ops vcpudispatch_stats_freq_proc_ops = { 631 .proc_open = vcpudispatch_stats_freq_open, 632 .proc_read = seq_read, 633 .proc_write = vcpudispatch_stats_freq_write, 634 .proc_lseek = seq_lseek, 635 .proc_release = single_release, 636 }; 637 638 static int __init vcpudispatch_stats_procfs_init(void) 639 { 640 /* 641 * Avoid smp_processor_id while preemptible. All CPUs should have 642 * the same value for lppaca_shared_proc. 643 */ 644 preempt_disable(); 645 if (!lppaca_shared_proc(get_lppaca())) { 646 preempt_enable(); 647 return 0; 648 } 649 preempt_enable(); 650 651 if (!proc_create("powerpc/vcpudispatch_stats", 0600, NULL, 652 &vcpudispatch_stats_proc_ops)) 653 pr_err("vcpudispatch_stats: error creating procfs file\n"); 654 else if (!proc_create("powerpc/vcpudispatch_stats_freq", 0600, NULL, 655 &vcpudispatch_stats_freq_proc_ops)) 656 pr_err("vcpudispatch_stats_freq: error creating procfs file\n"); 657 658 return 0; 659 } 660 661 machine_device_initcall(pseries, vcpudispatch_stats_procfs_init); 662 #endif /* CONFIG_PPC_SPLPAR */ 663 664 void vpa_init(int cpu) 665 { 666 int hwcpu = get_hard_smp_processor_id(cpu); 667 unsigned long addr; 668 long ret; 669 670 /* 671 * The spec says it "may be problematic" if CPU x registers the VPA of 672 * CPU y. We should never do that, but wail if we ever do. 673 */ 674 WARN_ON(cpu != smp_processor_id()); 675 676 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 677 lppaca_of(cpu).vmxregs_in_use = 1; 678 679 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 680 lppaca_of(cpu).ebb_regs_in_use = 1; 681 682 addr = __pa(&lppaca_of(cpu)); 683 ret = register_vpa(hwcpu, addr); 684 685 if (ret) { 686 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area " 687 "%lx failed with %ld\n", cpu, hwcpu, addr, ret); 688 return; 689 } 690 691 #ifdef CONFIG_PPC_BOOK3S_64 692 /* 693 * PAPR says this feature is SLB-Buffer but firmware never 694 * reports that. All SPLPAR support SLB shadow buffer. 695 */ 696 if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) { 697 addr = __pa(paca_ptrs[cpu]->slb_shadow_ptr); 698 ret = register_slb_shadow(hwcpu, addr); 699 if (ret) 700 pr_err("WARNING: SLB shadow buffer registration for " 701 "cpu %d (hw %d) of area %lx failed with %ld\n", 702 cpu, hwcpu, addr, ret); 703 } 704 #endif /* CONFIG_PPC_BOOK3S_64 */ 705 706 /* 707 * Register dispatch trace log, if one has been allocated. 708 */ 709 register_dtl_buffer(cpu); 710 } 711 712 #ifdef CONFIG_PPC_BOOK3S_64 713 714 static long pSeries_lpar_hpte_insert(unsigned long hpte_group, 715 unsigned long vpn, unsigned long pa, 716 unsigned long rflags, unsigned long vflags, 717 int psize, int apsize, int ssize) 718 { 719 unsigned long lpar_rc; 720 unsigned long flags; 721 unsigned long slot; 722 unsigned long hpte_v, hpte_r; 723 724 if (!(vflags & HPTE_V_BOLTED)) 725 pr_devel("hpte_insert(group=%lx, vpn=%016lx, " 726 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n", 727 hpte_group, vpn, pa, rflags, vflags, psize); 728 729 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID; 730 hpte_r = hpte_encode_r(pa, psize, apsize) | rflags; 731 732 if (!(vflags & HPTE_V_BOLTED)) 733 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); 734 735 /* Now fill in the actual HPTE */ 736 /* Set CEC cookie to 0 */ 737 /* Zero page = 0 */ 738 /* I-cache Invalidate = 0 */ 739 /* I-cache synchronize = 0 */ 740 /* Exact = 0 */ 741 flags = 0; 742 743 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N)) 744 flags |= H_COALESCE_CAND; 745 746 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); 747 if (unlikely(lpar_rc == H_PTEG_FULL)) { 748 pr_devel("Hash table group is full\n"); 749 return -1; 750 } 751 752 /* 753 * Since we try and ioremap PHBs we don't own, the pte insert 754 * will fail. However we must catch the failure in hash_page 755 * or we will loop forever, so return -2 in this case. 756 */ 757 if (unlikely(lpar_rc != H_SUCCESS)) { 758 pr_err("Failed hash pte insert with error %ld\n", lpar_rc); 759 return -2; 760 } 761 if (!(vflags & HPTE_V_BOLTED)) 762 pr_devel(" -> slot: %lu\n", slot & 7); 763 764 /* Because of iSeries, we have to pass down the secondary 765 * bucket bit here as well 766 */ 767 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); 768 } 769 770 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); 771 772 static long pSeries_lpar_hpte_remove(unsigned long hpte_group) 773 { 774 unsigned long slot_offset; 775 unsigned long lpar_rc; 776 int i; 777 unsigned long dummy1, dummy2; 778 779 /* pick a random slot to start at */ 780 slot_offset = mftb() & 0x7; 781 782 for (i = 0; i < HPTES_PER_GROUP; i++) { 783 784 /* don't remove a bolted entry */ 785 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, 786 HPTE_V_BOLTED, &dummy1, &dummy2); 787 if (lpar_rc == H_SUCCESS) 788 return i; 789 790 /* 791 * The test for adjunct partition is performed before the 792 * ANDCOND test. H_RESOURCE may be returned, so we need to 793 * check for that as well. 794 */ 795 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE); 796 797 slot_offset++; 798 slot_offset &= 0x7; 799 } 800 801 return -1; 802 } 803 804 static void manual_hpte_clear_all(void) 805 { 806 unsigned long size_bytes = 1UL << ppc64_pft_size; 807 unsigned long hpte_count = size_bytes >> 4; 808 struct { 809 unsigned long pteh; 810 unsigned long ptel; 811 } ptes[4]; 812 long lpar_rc; 813 unsigned long i, j; 814 815 /* Read in batches of 4, 816 * invalidate only valid entries not in the VRMA 817 * hpte_count will be a multiple of 4 818 */ 819 for (i = 0; i < hpte_count; i += 4) { 820 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); 821 if (lpar_rc != H_SUCCESS) { 822 pr_info("Failed to read hash page table at %ld err %ld\n", 823 i, lpar_rc); 824 continue; 825 } 826 for (j = 0; j < 4; j++){ 827 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == 828 HPTE_V_VRMA_MASK) 829 continue; 830 if (ptes[j].pteh & HPTE_V_VALID) 831 plpar_pte_remove_raw(0, i + j, 0, 832 &(ptes[j].pteh), &(ptes[j].ptel)); 833 } 834 } 835 } 836 837 static int hcall_hpte_clear_all(void) 838 { 839 int rc; 840 841 do { 842 rc = plpar_hcall_norets(H_CLEAR_HPT); 843 } while (rc == H_CONTINUE); 844 845 return rc; 846 } 847 848 static void pseries_hpte_clear_all(void) 849 { 850 int rc; 851 852 rc = hcall_hpte_clear_all(); 853 if (rc != H_SUCCESS) 854 manual_hpte_clear_all(); 855 856 #ifdef __LITTLE_ENDIAN__ 857 /* 858 * Reset exceptions to big endian. 859 * 860 * FIXME this is a hack for kexec, we need to reset the exception 861 * endian before starting the new kernel and this is a convenient place 862 * to do it. 863 * 864 * This is also called on boot when a fadump happens. In that case we 865 * must not change the exception endian mode. 866 */ 867 if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) 868 pseries_big_endian_exceptions(); 869 #endif 870 } 871 872 /* 873 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and 874 * the low 3 bits of flags happen to line up. So no transform is needed. 875 * We can probably optimize here and assume the high bits of newpp are 876 * already zero. For now I am paranoid. 877 */ 878 static long pSeries_lpar_hpte_updatepp(unsigned long slot, 879 unsigned long newpp, 880 unsigned long vpn, 881 int psize, int apsize, 882 int ssize, unsigned long inv_flags) 883 { 884 unsigned long lpar_rc; 885 unsigned long flags; 886 unsigned long want_v; 887 888 want_v = hpte_encode_avpn(vpn, psize, ssize); 889 890 flags = (newpp & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO)) | H_AVPN; 891 flags |= (newpp & HPTE_R_KEY_HI) >> 48; 892 if (mmu_has_feature(MMU_FTR_KERNEL_RO)) 893 /* Move pp0 into bit 8 (IBM 55) */ 894 flags |= (newpp & HPTE_R_PP0) >> 55; 895 896 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", 897 want_v, slot, flags, psize); 898 899 lpar_rc = plpar_pte_protect(flags, slot, want_v); 900 901 if (lpar_rc == H_NOT_FOUND) { 902 pr_devel("not found !\n"); 903 return -1; 904 } 905 906 pr_devel("ok\n"); 907 908 BUG_ON(lpar_rc != H_SUCCESS); 909 910 return 0; 911 } 912 913 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group) 914 { 915 long lpar_rc; 916 unsigned long i, j; 917 struct { 918 unsigned long pteh; 919 unsigned long ptel; 920 } ptes[4]; 921 922 for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) { 923 924 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes); 925 if (lpar_rc != H_SUCCESS) { 926 pr_info("Failed to read hash page table at %ld err %ld\n", 927 hpte_group, lpar_rc); 928 continue; 929 } 930 931 for (j = 0; j < 4; j++) { 932 if (HPTE_V_COMPARE(ptes[j].pteh, want_v) && 933 (ptes[j].pteh & HPTE_V_VALID)) 934 return i + j; 935 } 936 } 937 938 return -1; 939 } 940 941 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) 942 { 943 long slot; 944 unsigned long hash; 945 unsigned long want_v; 946 unsigned long hpte_group; 947 948 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); 949 want_v = hpte_encode_avpn(vpn, psize, ssize); 950 951 /* 952 * We try to keep bolted entries always in primary hash 953 * But in some case we can find them in secondary too. 954 */ 955 hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP; 956 slot = __pSeries_lpar_hpte_find(want_v, hpte_group); 957 if (slot < 0) { 958 /* Try in secondary */ 959 hpte_group = (~hash & htab_hash_mask) * HPTES_PER_GROUP; 960 slot = __pSeries_lpar_hpte_find(want_v, hpte_group); 961 if (slot < 0) 962 return -1; 963 } 964 return hpte_group + slot; 965 } 966 967 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, 968 unsigned long ea, 969 int psize, int ssize) 970 { 971 unsigned long vpn; 972 unsigned long lpar_rc, slot, vsid, flags; 973 974 vsid = get_kernel_vsid(ea, ssize); 975 vpn = hpt_vpn(ea, vsid, ssize); 976 977 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 978 BUG_ON(slot == -1); 979 980 flags = newpp & 7; 981 if (mmu_has_feature(MMU_FTR_KERNEL_RO)) 982 /* Move pp0 into bit 8 (IBM 55) */ 983 flags |= (newpp & HPTE_R_PP0) >> 55; 984 985 lpar_rc = plpar_pte_protect(flags, slot, 0); 986 987 BUG_ON(lpar_rc != H_SUCCESS); 988 } 989 990 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, 991 int psize, int apsize, 992 int ssize, int local) 993 { 994 unsigned long want_v; 995 unsigned long lpar_rc; 996 unsigned long dummy1, dummy2; 997 998 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n", 999 slot, vpn, psize, local); 1000 1001 want_v = hpte_encode_avpn(vpn, psize, ssize); 1002 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); 1003 if (lpar_rc == H_NOT_FOUND) 1004 return; 1005 1006 BUG_ON(lpar_rc != H_SUCCESS); 1007 } 1008 1009 1010 /* 1011 * As defined in the PAPR's section 14.5.4.1.8 1012 * The control mask doesn't include the returned reference and change bit from 1013 * the processed PTE. 1014 */ 1015 #define HBLKR_AVPN 0x0100000000000000UL 1016 #define HBLKR_CTRL_MASK 0xf800000000000000UL 1017 #define HBLKR_CTRL_SUCCESS 0x8000000000000000UL 1018 #define HBLKR_CTRL_ERRNOTFOUND 0x8800000000000000UL 1019 #define HBLKR_CTRL_ERRBUSY 0xa000000000000000UL 1020 1021 /* 1022 * Returned true if we are supporting this block size for the specified segment 1023 * base page size and actual page size. 1024 * 1025 * Currently, we only support 8 size block. 1026 */ 1027 static inline bool is_supported_hlbkrm(int bpsize, int psize) 1028 { 1029 return (hblkrm_size[bpsize][psize] == HBLKRM_SUPPORTED_BLOCK_SIZE); 1030 } 1031 1032 /** 1033 * H_BLOCK_REMOVE caller. 1034 * @idx should point to the latest @param entry set with a PTEX. 1035 * If PTE cannot be processed because another CPUs has already locked that 1036 * group, those entries are put back in @param starting at index 1. 1037 * If entries has to be retried and @retry_busy is set to true, these entries 1038 * are retried until success. If @retry_busy is set to false, the returned 1039 * is the number of entries yet to process. 1040 */ 1041 static unsigned long call_block_remove(unsigned long idx, unsigned long *param, 1042 bool retry_busy) 1043 { 1044 unsigned long i, rc, new_idx; 1045 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 1046 1047 if (idx < 2) { 1048 pr_warn("Unexpected empty call to H_BLOCK_REMOVE"); 1049 return 0; 1050 } 1051 again: 1052 new_idx = 0; 1053 if (idx > PLPAR_HCALL9_BUFSIZE) { 1054 pr_err("Too many PTEs (%lu) for H_BLOCK_REMOVE", idx); 1055 idx = PLPAR_HCALL9_BUFSIZE; 1056 } else if (idx < PLPAR_HCALL9_BUFSIZE) 1057 param[idx] = HBR_END; 1058 1059 rc = plpar_hcall9(H_BLOCK_REMOVE, retbuf, 1060 param[0], /* AVA */ 1061 param[1], param[2], param[3], param[4], /* TS0-7 */ 1062 param[5], param[6], param[7], param[8]); 1063 if (rc == H_SUCCESS) 1064 return 0; 1065 1066 BUG_ON(rc != H_PARTIAL); 1067 1068 /* Check that the unprocessed entries were 'not found' or 'busy' */ 1069 for (i = 0; i < idx-1; i++) { 1070 unsigned long ctrl = retbuf[i] & HBLKR_CTRL_MASK; 1071 1072 if (ctrl == HBLKR_CTRL_ERRBUSY) { 1073 param[++new_idx] = param[i+1]; 1074 continue; 1075 } 1076 1077 BUG_ON(ctrl != HBLKR_CTRL_SUCCESS 1078 && ctrl != HBLKR_CTRL_ERRNOTFOUND); 1079 } 1080 1081 /* 1082 * If there were entries found busy, retry these entries if requested, 1083 * of if all the entries have to be retried. 1084 */ 1085 if (new_idx && (retry_busy || new_idx == (PLPAR_HCALL9_BUFSIZE-1))) { 1086 idx = new_idx + 1; 1087 goto again; 1088 } 1089 1090 return new_idx; 1091 } 1092 1093 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 1094 /* 1095 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need 1096 * to make sure that we avoid bouncing the hypervisor tlbie lock. 1097 */ 1098 #define PPC64_HUGE_HPTE_BATCH 12 1099 1100 static void hugepage_block_invalidate(unsigned long *slot, unsigned long *vpn, 1101 int count, int psize, int ssize) 1102 { 1103 unsigned long param[PLPAR_HCALL9_BUFSIZE]; 1104 unsigned long shift, current_vpgb, vpgb; 1105 int i, pix = 0; 1106 1107 shift = mmu_psize_defs[psize].shift; 1108 1109 for (i = 0; i < count; i++) { 1110 /* 1111 * Shifting 3 bits more on the right to get a 1112 * 8 pages aligned virtual addresse. 1113 */ 1114 vpgb = (vpn[i] >> (shift - VPN_SHIFT + 3)); 1115 if (!pix || vpgb != current_vpgb) { 1116 /* 1117 * Need to start a new 8 pages block, flush 1118 * the current one if needed. 1119 */ 1120 if (pix) 1121 (void)call_block_remove(pix, param, true); 1122 current_vpgb = vpgb; 1123 param[0] = hpte_encode_avpn(vpn[i], psize, ssize); 1124 pix = 1; 1125 } 1126 1127 param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot[i]; 1128 if (pix == PLPAR_HCALL9_BUFSIZE) { 1129 pix = call_block_remove(pix, param, false); 1130 /* 1131 * pix = 0 means that all the entries were 1132 * removed, we can start a new block. 1133 * Otherwise, this means that there are entries 1134 * to retry, and pix points to latest one, so 1135 * we should increment it and try to continue 1136 * the same block. 1137 */ 1138 if (pix) 1139 pix++; 1140 } 1141 } 1142 if (pix) 1143 (void)call_block_remove(pix, param, true); 1144 } 1145 1146 static void hugepage_bulk_invalidate(unsigned long *slot, unsigned long *vpn, 1147 int count, int psize, int ssize) 1148 { 1149 unsigned long param[PLPAR_HCALL9_BUFSIZE]; 1150 int i = 0, pix = 0, rc; 1151 1152 for (i = 0; i < count; i++) { 1153 1154 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 1155 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, 1156 ssize, 0); 1157 } else { 1158 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; 1159 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); 1160 pix += 2; 1161 if (pix == 8) { 1162 rc = plpar_hcall9(H_BULK_REMOVE, param, 1163 param[0], param[1], param[2], 1164 param[3], param[4], param[5], 1165 param[6], param[7]); 1166 BUG_ON(rc != H_SUCCESS); 1167 pix = 0; 1168 } 1169 } 1170 } 1171 if (pix) { 1172 param[pix] = HBR_END; 1173 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 1174 param[2], param[3], param[4], param[5], 1175 param[6], param[7]); 1176 BUG_ON(rc != H_SUCCESS); 1177 } 1178 } 1179 1180 static inline void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, 1181 unsigned long *vpn, 1182 int count, int psize, 1183 int ssize) 1184 { 1185 unsigned long flags = 0; 1186 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 1187 1188 if (lock_tlbie) 1189 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 1190 1191 /* Assuming THP size is 16M */ 1192 if (is_supported_hlbkrm(psize, MMU_PAGE_16M)) 1193 hugepage_block_invalidate(slot, vpn, count, psize, ssize); 1194 else 1195 hugepage_bulk_invalidate(slot, vpn, count, psize, ssize); 1196 1197 if (lock_tlbie) 1198 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 1199 } 1200 1201 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 1202 unsigned long addr, 1203 unsigned char *hpte_slot_array, 1204 int psize, int ssize, int local) 1205 { 1206 int i, index = 0; 1207 unsigned long s_addr = addr; 1208 unsigned int max_hpte_count, valid; 1209 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH]; 1210 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH]; 1211 unsigned long shift, hidx, vpn = 0, hash, slot; 1212 1213 shift = mmu_psize_defs[psize].shift; 1214 max_hpte_count = 1U << (PMD_SHIFT - shift); 1215 1216 for (i = 0; i < max_hpte_count; i++) { 1217 valid = hpte_valid(hpte_slot_array, i); 1218 if (!valid) 1219 continue; 1220 hidx = hpte_hash_index(hpte_slot_array, i); 1221 1222 /* get the vpn */ 1223 addr = s_addr + (i * (1ul << shift)); 1224 vpn = hpt_vpn(addr, vsid, ssize); 1225 hash = hpt_hash(vpn, shift, ssize); 1226 if (hidx & _PTEIDX_SECONDARY) 1227 hash = ~hash; 1228 1229 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 1230 slot += hidx & _PTEIDX_GROUP_IX; 1231 1232 slot_array[index] = slot; 1233 vpn_array[index] = vpn; 1234 if (index == PPC64_HUGE_HPTE_BATCH - 1) { 1235 /* 1236 * Now do a bluk invalidate 1237 */ 1238 __pSeries_lpar_hugepage_invalidate(slot_array, 1239 vpn_array, 1240 PPC64_HUGE_HPTE_BATCH, 1241 psize, ssize); 1242 index = 0; 1243 } else 1244 index++; 1245 } 1246 if (index) 1247 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, 1248 index, psize, ssize); 1249 } 1250 #else 1251 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, 1252 unsigned long addr, 1253 unsigned char *hpte_slot_array, 1254 int psize, int ssize, int local) 1255 { 1256 WARN(1, "%s called without THP support\n", __func__); 1257 } 1258 #endif 1259 1260 static int pSeries_lpar_hpte_removebolted(unsigned long ea, 1261 int psize, int ssize) 1262 { 1263 unsigned long vpn; 1264 unsigned long slot, vsid; 1265 1266 vsid = get_kernel_vsid(ea, ssize); 1267 vpn = hpt_vpn(ea, vsid, ssize); 1268 1269 slot = pSeries_lpar_hpte_find(vpn, psize, ssize); 1270 if (slot == -1) 1271 return -ENOENT; 1272 1273 /* 1274 * lpar doesn't use the passed actual page size 1275 */ 1276 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); 1277 return 0; 1278 } 1279 1280 1281 static inline unsigned long compute_slot(real_pte_t pte, 1282 unsigned long vpn, 1283 unsigned long index, 1284 unsigned long shift, 1285 int ssize) 1286 { 1287 unsigned long slot, hash, hidx; 1288 1289 hash = hpt_hash(vpn, shift, ssize); 1290 hidx = __rpte_to_hidx(pte, index); 1291 if (hidx & _PTEIDX_SECONDARY) 1292 hash = ~hash; 1293 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; 1294 slot += hidx & _PTEIDX_GROUP_IX; 1295 return slot; 1296 } 1297 1298 /** 1299 * The hcall H_BLOCK_REMOVE implies that the virtual pages to processed are 1300 * "all within the same naturally aligned 8 page virtual address block". 1301 */ 1302 static void do_block_remove(unsigned long number, struct ppc64_tlb_batch *batch, 1303 unsigned long *param) 1304 { 1305 unsigned long vpn; 1306 unsigned long i, pix = 0; 1307 unsigned long index, shift, slot, current_vpgb, vpgb; 1308 real_pte_t pte; 1309 int psize, ssize; 1310 1311 psize = batch->psize; 1312 ssize = batch->ssize; 1313 1314 for (i = 0; i < number; i++) { 1315 vpn = batch->vpn[i]; 1316 pte = batch->pte[i]; 1317 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 1318 /* 1319 * Shifting 3 bits more on the right to get a 1320 * 8 pages aligned virtual addresse. 1321 */ 1322 vpgb = (vpn >> (shift - VPN_SHIFT + 3)); 1323 if (!pix || vpgb != current_vpgb) { 1324 /* 1325 * Need to start a new 8 pages block, flush 1326 * the current one if needed. 1327 */ 1328 if (pix) 1329 (void)call_block_remove(pix, param, 1330 true); 1331 current_vpgb = vpgb; 1332 param[0] = hpte_encode_avpn(vpn, psize, 1333 ssize); 1334 pix = 1; 1335 } 1336 1337 slot = compute_slot(pte, vpn, index, shift, ssize); 1338 param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot; 1339 1340 if (pix == PLPAR_HCALL9_BUFSIZE) { 1341 pix = call_block_remove(pix, param, false); 1342 /* 1343 * pix = 0 means that all the entries were 1344 * removed, we can start a new block. 1345 * Otherwise, this means that there are entries 1346 * to retry, and pix points to latest one, so 1347 * we should increment it and try to continue 1348 * the same block. 1349 */ 1350 if (pix) 1351 pix++; 1352 } 1353 } pte_iterate_hashed_end(); 1354 } 1355 1356 if (pix) 1357 (void)call_block_remove(pix, param, true); 1358 } 1359 1360 /* 1361 * TLB Block Invalidate Characteristics 1362 * 1363 * These characteristics define the size of the block the hcall H_BLOCK_REMOVE 1364 * is able to process for each couple segment base page size, actual page size. 1365 * 1366 * The ibm,get-system-parameter properties is returning a buffer with the 1367 * following layout: 1368 * 1369 * [ 2 bytes size of the RTAS buffer (excluding these 2 bytes) ] 1370 * ----------------- 1371 * TLB Block Invalidate Specifiers: 1372 * [ 1 byte LOG base 2 of the TLB invalidate block size being specified ] 1373 * [ 1 byte Number of page sizes (N) that are supported for the specified 1374 * TLB invalidate block size ] 1375 * [ 1 byte Encoded segment base page size and actual page size 1376 * MSB=0 means 4k segment base page size and actual page size 1377 * MSB=1 the penc value in mmu_psize_def ] 1378 * ... 1379 * ----------------- 1380 * Next TLB Block Invalidate Specifiers... 1381 * ----------------- 1382 * [ 0 ] 1383 */ 1384 static inline void set_hblkrm_bloc_size(int bpsize, int psize, 1385 unsigned int block_size) 1386 { 1387 if (block_size > hblkrm_size[bpsize][psize]) 1388 hblkrm_size[bpsize][psize] = block_size; 1389 } 1390 1391 /* 1392 * Decode the Encoded segment base page size and actual page size. 1393 * PAPR specifies: 1394 * - bit 7 is the L bit 1395 * - bits 0-5 are the penc value 1396 * If the L bit is 0, this means 4K segment base page size and actual page size 1397 * otherwise the penc value should be read. 1398 */ 1399 #define HBLKRM_L_MASK 0x80 1400 #define HBLKRM_PENC_MASK 0x3f 1401 static inline void __init check_lp_set_hblkrm(unsigned int lp, 1402 unsigned int block_size) 1403 { 1404 unsigned int bpsize, psize; 1405 1406 /* First, check the L bit, if not set, this means 4K */ 1407 if ((lp & HBLKRM_L_MASK) == 0) { 1408 set_hblkrm_bloc_size(MMU_PAGE_4K, MMU_PAGE_4K, block_size); 1409 return; 1410 } 1411 1412 lp &= HBLKRM_PENC_MASK; 1413 for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++) { 1414 struct mmu_psize_def *def = &mmu_psize_defs[bpsize]; 1415 1416 for (psize = 0; psize < MMU_PAGE_COUNT; psize++) { 1417 if (def->penc[psize] == lp) { 1418 set_hblkrm_bloc_size(bpsize, psize, block_size); 1419 return; 1420 } 1421 } 1422 } 1423 } 1424 1425 #define SPLPAR_TLB_BIC_TOKEN 50 1426 1427 /* 1428 * The size of the TLB Block Invalidate Characteristics is variable. But at the 1429 * maximum it will be the number of possible page sizes *2 + 10 bytes. 1430 * Currently MMU_PAGE_COUNT is 16, which means 42 bytes. Use a cache line size 1431 * (128 bytes) for the buffer to get plenty of space. 1432 */ 1433 #define SPLPAR_TLB_BIC_MAXLENGTH 128 1434 1435 void __init pseries_lpar_read_hblkrm_characteristics(void) 1436 { 1437 unsigned char local_buffer[SPLPAR_TLB_BIC_MAXLENGTH]; 1438 int call_status, len, idx, bpsize; 1439 1440 if (!firmware_has_feature(FW_FEATURE_BLOCK_REMOVE)) 1441 return; 1442 1443 spin_lock(&rtas_data_buf_lock); 1444 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); 1445 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, 1446 NULL, 1447 SPLPAR_TLB_BIC_TOKEN, 1448 __pa(rtas_data_buf), 1449 RTAS_DATA_BUF_SIZE); 1450 memcpy(local_buffer, rtas_data_buf, SPLPAR_TLB_BIC_MAXLENGTH); 1451 local_buffer[SPLPAR_TLB_BIC_MAXLENGTH - 1] = '\0'; 1452 spin_unlock(&rtas_data_buf_lock); 1453 1454 if (call_status != 0) { 1455 pr_warn("%s %s Error calling get-system-parameter (0x%x)\n", 1456 __FILE__, __func__, call_status); 1457 return; 1458 } 1459 1460 /* 1461 * The first two (2) bytes of the data in the buffer are the length of 1462 * the returned data, not counting these first two (2) bytes. 1463 */ 1464 len = be16_to_cpu(*((u16 *)local_buffer)) + 2; 1465 if (len > SPLPAR_TLB_BIC_MAXLENGTH) { 1466 pr_warn("%s too large returned buffer %d", __func__, len); 1467 return; 1468 } 1469 1470 idx = 2; 1471 while (idx < len) { 1472 u8 block_shift = local_buffer[idx++]; 1473 u32 block_size; 1474 unsigned int npsize; 1475 1476 if (!block_shift) 1477 break; 1478 1479 block_size = 1 << block_shift; 1480 1481 for (npsize = local_buffer[idx++]; 1482 npsize > 0 && idx < len; npsize--) 1483 check_lp_set_hblkrm((unsigned int) local_buffer[idx++], 1484 block_size); 1485 } 1486 1487 for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++) 1488 for (idx = 0; idx < MMU_PAGE_COUNT; idx++) 1489 if (hblkrm_size[bpsize][idx]) 1490 pr_info("H_BLOCK_REMOVE supports base psize:%d psize:%d block size:%d", 1491 bpsize, idx, hblkrm_size[bpsize][idx]); 1492 } 1493 1494 /* 1495 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie 1496 * lock. 1497 */ 1498 static void pSeries_lpar_flush_hash_range(unsigned long number, int local) 1499 { 1500 unsigned long vpn; 1501 unsigned long i, pix, rc; 1502 unsigned long flags = 0; 1503 struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch); 1504 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); 1505 unsigned long param[PLPAR_HCALL9_BUFSIZE]; 1506 unsigned long index, shift, slot; 1507 real_pte_t pte; 1508 int psize, ssize; 1509 1510 if (lock_tlbie) 1511 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); 1512 1513 if (is_supported_hlbkrm(batch->psize, batch->psize)) { 1514 do_block_remove(number, batch, param); 1515 goto out; 1516 } 1517 1518 psize = batch->psize; 1519 ssize = batch->ssize; 1520 pix = 0; 1521 for (i = 0; i < number; i++) { 1522 vpn = batch->vpn[i]; 1523 pte = batch->pte[i]; 1524 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { 1525 slot = compute_slot(pte, vpn, index, shift, ssize); 1526 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 1527 /* 1528 * lpar doesn't use the passed actual page size 1529 */ 1530 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 1531 0, ssize, local); 1532 } else { 1533 param[pix] = HBR_REQUEST | HBR_AVPN | slot; 1534 param[pix+1] = hpte_encode_avpn(vpn, psize, 1535 ssize); 1536 pix += 2; 1537 if (pix == 8) { 1538 rc = plpar_hcall9(H_BULK_REMOVE, param, 1539 param[0], param[1], param[2], 1540 param[3], param[4], param[5], 1541 param[6], param[7]); 1542 BUG_ON(rc != H_SUCCESS); 1543 pix = 0; 1544 } 1545 } 1546 } pte_iterate_hashed_end(); 1547 } 1548 if (pix) { 1549 param[pix] = HBR_END; 1550 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], 1551 param[2], param[3], param[4], param[5], 1552 param[6], param[7]); 1553 BUG_ON(rc != H_SUCCESS); 1554 } 1555 1556 out: 1557 if (lock_tlbie) 1558 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); 1559 } 1560 1561 static int __init disable_bulk_remove(char *str) 1562 { 1563 if (strcmp(str, "off") == 0 && 1564 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { 1565 pr_info("Disabling BULK_REMOVE firmware feature"); 1566 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; 1567 } 1568 return 1; 1569 } 1570 1571 __setup("bulk_remove=", disable_bulk_remove); 1572 1573 #define HPT_RESIZE_TIMEOUT 10000 /* ms */ 1574 1575 struct hpt_resize_state { 1576 unsigned long shift; 1577 int commit_rc; 1578 }; 1579 1580 static int pseries_lpar_resize_hpt_commit(void *data) 1581 { 1582 struct hpt_resize_state *state = data; 1583 1584 state->commit_rc = plpar_resize_hpt_commit(0, state->shift); 1585 if (state->commit_rc != H_SUCCESS) 1586 return -EIO; 1587 1588 /* Hypervisor has transitioned the HTAB, update our globals */ 1589 ppc64_pft_size = state->shift; 1590 htab_size_bytes = 1UL << ppc64_pft_size; 1591 htab_hash_mask = (htab_size_bytes >> 7) - 1; 1592 1593 return 0; 1594 } 1595 1596 /* 1597 * Must be called in process context. The caller must hold the 1598 * cpus_lock. 1599 */ 1600 static int pseries_lpar_resize_hpt(unsigned long shift) 1601 { 1602 struct hpt_resize_state state = { 1603 .shift = shift, 1604 .commit_rc = H_FUNCTION, 1605 }; 1606 unsigned int delay, total_delay = 0; 1607 int rc; 1608 ktime_t t0, t1, t2; 1609 1610 might_sleep(); 1611 1612 if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE)) 1613 return -ENODEV; 1614 1615 pr_info("Attempting to resize HPT to shift %lu\n", shift); 1616 1617 t0 = ktime_get(); 1618 1619 rc = plpar_resize_hpt_prepare(0, shift); 1620 while (H_IS_LONG_BUSY(rc)) { 1621 delay = get_longbusy_msecs(rc); 1622 total_delay += delay; 1623 if (total_delay > HPT_RESIZE_TIMEOUT) { 1624 /* prepare with shift==0 cancels an in-progress resize */ 1625 rc = plpar_resize_hpt_prepare(0, 0); 1626 if (rc != H_SUCCESS) 1627 pr_warn("Unexpected error %d cancelling timed out HPT resize\n", 1628 rc); 1629 return -ETIMEDOUT; 1630 } 1631 msleep(delay); 1632 rc = plpar_resize_hpt_prepare(0, shift); 1633 }; 1634 1635 switch (rc) { 1636 case H_SUCCESS: 1637 /* Continue on */ 1638 break; 1639 1640 case H_PARAMETER: 1641 pr_warn("Invalid argument from H_RESIZE_HPT_PREPARE\n"); 1642 return -EINVAL; 1643 case H_RESOURCE: 1644 pr_warn("Operation not permitted from H_RESIZE_HPT_PREPARE\n"); 1645 return -EPERM; 1646 default: 1647 pr_warn("Unexpected error %d from H_RESIZE_HPT_PREPARE\n", rc); 1648 return -EIO; 1649 } 1650 1651 t1 = ktime_get(); 1652 1653 rc = stop_machine_cpuslocked(pseries_lpar_resize_hpt_commit, 1654 &state, NULL); 1655 1656 t2 = ktime_get(); 1657 1658 if (rc != 0) { 1659 switch (state.commit_rc) { 1660 case H_PTEG_FULL: 1661 return -ENOSPC; 1662 1663 default: 1664 pr_warn("Unexpected error %d from H_RESIZE_HPT_COMMIT\n", 1665 state.commit_rc); 1666 return -EIO; 1667 }; 1668 } 1669 1670 pr_info("HPT resize to shift %lu complete (%lld ms / %lld ms)\n", 1671 shift, (long long) ktime_ms_delta(t1, t0), 1672 (long long) ktime_ms_delta(t2, t1)); 1673 1674 return 0; 1675 } 1676 1677 static int pseries_lpar_register_process_table(unsigned long base, 1678 unsigned long page_size, unsigned long table_size) 1679 { 1680 long rc; 1681 unsigned long flags = 0; 1682 1683 if (table_size) 1684 flags |= PROC_TABLE_NEW; 1685 if (radix_enabled()) { 1686 flags |= PROC_TABLE_RADIX; 1687 if (mmu_has_feature(MMU_FTR_GTSE)) 1688 flags |= PROC_TABLE_GTSE; 1689 } else 1690 flags |= PROC_TABLE_HPT_SLB; 1691 for (;;) { 1692 rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base, 1693 page_size, table_size); 1694 if (!H_IS_LONG_BUSY(rc)) 1695 break; 1696 mdelay(get_longbusy_msecs(rc)); 1697 } 1698 if (rc != H_SUCCESS) { 1699 pr_err("Failed to register process table (rc=%ld)\n", rc); 1700 BUG(); 1701 } 1702 return rc; 1703 } 1704 1705 void __init hpte_init_pseries(void) 1706 { 1707 mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate; 1708 mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp; 1709 mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; 1710 mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert; 1711 mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove; 1712 mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted; 1713 mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range; 1714 mmu_hash_ops.hpte_clear_all = pseries_hpte_clear_all; 1715 mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; 1716 1717 if (firmware_has_feature(FW_FEATURE_HPT_RESIZE)) 1718 mmu_hash_ops.resize_hpt = pseries_lpar_resize_hpt; 1719 1720 /* 1721 * On POWER9, we need to do a H_REGISTER_PROC_TBL hcall 1722 * to inform the hypervisor that we wish to use the HPT. 1723 */ 1724 if (cpu_has_feature(CPU_FTR_ARCH_300)) 1725 pseries_lpar_register_process_table(0, 0, 0); 1726 } 1727 1728 #ifdef CONFIG_PPC_RADIX_MMU 1729 void radix_init_pseries(void) 1730 { 1731 pr_info("Using radix MMU under hypervisor\n"); 1732 1733 pseries_lpar_register_process_table(__pa(process_tb), 1734 0, PRTB_SIZE_SHIFT - 12); 1735 } 1736 #endif 1737 1738 #ifdef CONFIG_PPC_SMLPAR 1739 #define CMO_FREE_HINT_DEFAULT 1 1740 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; 1741 1742 static int __init cmo_free_hint(char *str) 1743 { 1744 char *parm; 1745 parm = strstrip(str); 1746 1747 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { 1748 pr_info("%s: CMO free page hinting is not active.\n", __func__); 1749 cmo_free_hint_flag = 0; 1750 return 1; 1751 } 1752 1753 cmo_free_hint_flag = 1; 1754 pr_info("%s: CMO free page hinting is active.\n", __func__); 1755 1756 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) 1757 return 1; 1758 1759 return 0; 1760 } 1761 1762 __setup("cmo_free_hint=", cmo_free_hint); 1763 1764 static void pSeries_set_page_state(struct page *page, int order, 1765 unsigned long state) 1766 { 1767 int i, j; 1768 unsigned long cmo_page_sz, addr; 1769 1770 cmo_page_sz = cmo_get_page_size(); 1771 addr = __pa((unsigned long)page_address(page)); 1772 1773 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { 1774 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) 1775 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); 1776 } 1777 } 1778 1779 void arch_free_page(struct page *page, int order) 1780 { 1781 if (radix_enabled()) 1782 return; 1783 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) 1784 return; 1785 1786 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); 1787 } 1788 EXPORT_SYMBOL(arch_free_page); 1789 1790 #endif /* CONFIG_PPC_SMLPAR */ 1791 #endif /* CONFIG_PPC_BOOK3S_64 */ 1792 1793 #ifdef CONFIG_TRACEPOINTS 1794 #ifdef CONFIG_JUMP_LABEL 1795 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT; 1796 1797 int hcall_tracepoint_regfunc(void) 1798 { 1799 static_key_slow_inc(&hcall_tracepoint_key); 1800 return 0; 1801 } 1802 1803 void hcall_tracepoint_unregfunc(void) 1804 { 1805 static_key_slow_dec(&hcall_tracepoint_key); 1806 } 1807 #else 1808 /* 1809 * We optimise our hcall path by placing hcall_tracepoint_refcount 1810 * directly in the TOC so we can check if the hcall tracepoints are 1811 * enabled via a single load. 1812 */ 1813 1814 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ 1815 extern long hcall_tracepoint_refcount; 1816 1817 int hcall_tracepoint_regfunc(void) 1818 { 1819 hcall_tracepoint_refcount++; 1820 return 0; 1821 } 1822 1823 void hcall_tracepoint_unregfunc(void) 1824 { 1825 hcall_tracepoint_refcount--; 1826 } 1827 #endif 1828 1829 /* 1830 * Since the tracing code might execute hcalls we need to guard against 1831 * recursion. One example of this are spinlocks calling H_YIELD on 1832 * shared processor partitions. 1833 */ 1834 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); 1835 1836 1837 void __trace_hcall_entry(unsigned long opcode, unsigned long *args) 1838 { 1839 unsigned long flags; 1840 unsigned int *depth; 1841 1842 /* 1843 * We cannot call tracepoints inside RCU idle regions which 1844 * means we must not trace H_CEDE. 1845 */ 1846 if (opcode == H_CEDE) 1847 return; 1848 1849 local_irq_save(flags); 1850 1851 depth = this_cpu_ptr(&hcall_trace_depth); 1852 1853 if (*depth) 1854 goto out; 1855 1856 (*depth)++; 1857 preempt_disable(); 1858 trace_hcall_entry(opcode, args); 1859 (*depth)--; 1860 1861 out: 1862 local_irq_restore(flags); 1863 } 1864 1865 void __trace_hcall_exit(long opcode, long retval, unsigned long *retbuf) 1866 { 1867 unsigned long flags; 1868 unsigned int *depth; 1869 1870 if (opcode == H_CEDE) 1871 return; 1872 1873 local_irq_save(flags); 1874 1875 depth = this_cpu_ptr(&hcall_trace_depth); 1876 1877 if (*depth) 1878 goto out; 1879 1880 (*depth)++; 1881 trace_hcall_exit(opcode, retval, retbuf); 1882 preempt_enable(); 1883 (*depth)--; 1884 1885 out: 1886 local_irq_restore(flags); 1887 } 1888 #endif 1889 1890 /** 1891 * h_get_mpp 1892 * H_GET_MPP hcall returns info in 7 parms 1893 */ 1894 int h_get_mpp(struct hvcall_mpp_data *mpp_data) 1895 { 1896 int rc; 1897 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; 1898 1899 rc = plpar_hcall9(H_GET_MPP, retbuf); 1900 1901 mpp_data->entitled_mem = retbuf[0]; 1902 mpp_data->mapped_mem = retbuf[1]; 1903 1904 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; 1905 mpp_data->pool_num = retbuf[2] & 0xffff; 1906 1907 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; 1908 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; 1909 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; 1910 1911 mpp_data->pool_size = retbuf[4]; 1912 mpp_data->loan_request = retbuf[5]; 1913 mpp_data->backing_mem = retbuf[6]; 1914 1915 return rc; 1916 } 1917 EXPORT_SYMBOL(h_get_mpp); 1918 1919 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) 1920 { 1921 int rc; 1922 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; 1923 1924 rc = plpar_hcall9(H_GET_MPP_X, retbuf); 1925 1926 mpp_x_data->coalesced_bytes = retbuf[0]; 1927 mpp_x_data->pool_coalesced_bytes = retbuf[1]; 1928 mpp_x_data->pool_purr_cycles = retbuf[2]; 1929 mpp_x_data->pool_spurr_cycles = retbuf[3]; 1930 1931 return rc; 1932 } 1933 1934 static unsigned long vsid_unscramble(unsigned long vsid, int ssize) 1935 { 1936 unsigned long protovsid; 1937 unsigned long va_bits = VA_BITS; 1938 unsigned long modinv, vsid_modulus; 1939 unsigned long max_mod_inv, tmp_modinv; 1940 1941 if (!mmu_has_feature(MMU_FTR_68_BIT_VA)) 1942 va_bits = 65; 1943 1944 if (ssize == MMU_SEGSIZE_256M) { 1945 modinv = VSID_MULINV_256M; 1946 vsid_modulus = ((1UL << (va_bits - SID_SHIFT)) - 1); 1947 } else { 1948 modinv = VSID_MULINV_1T; 1949 vsid_modulus = ((1UL << (va_bits - SID_SHIFT_1T)) - 1); 1950 } 1951 1952 /* 1953 * vsid outside our range. 1954 */ 1955 if (vsid >= vsid_modulus) 1956 return 0; 1957 1958 /* 1959 * If modinv is the modular multiplicate inverse of (x % vsid_modulus) 1960 * and vsid = (protovsid * x) % vsid_modulus, then we say: 1961 * protovsid = (vsid * modinv) % vsid_modulus 1962 */ 1963 1964 /* Check if (vsid * modinv) overflow (63 bits) */ 1965 max_mod_inv = 0x7fffffffffffffffull / vsid; 1966 if (modinv < max_mod_inv) 1967 return (vsid * modinv) % vsid_modulus; 1968 1969 tmp_modinv = modinv/max_mod_inv; 1970 modinv %= max_mod_inv; 1971 1972 protovsid = (((vsid * max_mod_inv) % vsid_modulus) * tmp_modinv) % vsid_modulus; 1973 protovsid = (protovsid + vsid * modinv) % vsid_modulus; 1974 1975 return protovsid; 1976 } 1977 1978 static int __init reserve_vrma_context_id(void) 1979 { 1980 unsigned long protovsid; 1981 1982 /* 1983 * Reserve context ids which map to reserved virtual addresses. For now 1984 * we only reserve the context id which maps to the VRMA VSID. We ignore 1985 * the addresses in "ibm,adjunct-virtual-addresses" because we don't 1986 * enable adjunct support via the "ibm,client-architecture-support" 1987 * interface. 1988 */ 1989 protovsid = vsid_unscramble(VRMA_VSID, MMU_SEGSIZE_1T); 1990 hash__reserve_context_id(protovsid >> ESID_BITS_1T); 1991 return 0; 1992 } 1993 machine_device_initcall(pseries, reserve_vrma_context_id); 1994 1995 #ifdef CONFIG_DEBUG_FS 1996 /* debugfs file interface for vpa data */ 1997 static ssize_t vpa_file_read(struct file *filp, char __user *buf, size_t len, 1998 loff_t *pos) 1999 { 2000 int cpu = (long)filp->private_data; 2001 struct lppaca *lppaca = &lppaca_of(cpu); 2002 2003 return simple_read_from_buffer(buf, len, pos, lppaca, 2004 sizeof(struct lppaca)); 2005 } 2006 2007 static const struct file_operations vpa_fops = { 2008 .open = simple_open, 2009 .read = vpa_file_read, 2010 .llseek = default_llseek, 2011 }; 2012 2013 static int __init vpa_debugfs_init(void) 2014 { 2015 char name[16]; 2016 long i; 2017 struct dentry *vpa_dir; 2018 2019 if (!firmware_has_feature(FW_FEATURE_SPLPAR)) 2020 return 0; 2021 2022 vpa_dir = debugfs_create_dir("vpa", powerpc_debugfs_root); 2023 2024 /* set up the per-cpu vpa file*/ 2025 for_each_possible_cpu(i) { 2026 sprintf(name, "cpu-%ld", i); 2027 debugfs_create_file(name, 0400, vpa_dir, (void *)i, &vpa_fops); 2028 } 2029 2030 return 0; 2031 } 2032 machine_arch_initcall(pseries, vpa_debugfs_init); 2033 #endif /* CONFIG_DEBUG_FS */ 2034