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 <linux/debugfs.h>
26
27 #include <asm/processor.h>
28 #include <asm/mmu.h>
29 #include <asm/page.h>
30 #include <asm/setup.h>
31 #include <asm/mmu_context.h>
32 #include <asm/iommu.h>
33 #include <asm/tlb.h>
34 #include <asm/cputable.h>
35 #include <asm/papr-sysparm.h>
36 #include <asm/udbg.h>
37 #include <asm/smp.h>
38 #include <asm/trace.h>
39 #include <asm/firmware.h>
40 #include <asm/plpar_wrappers.h>
41 #include <asm/kexec.h>
42 #include <asm/fadump.h>
43 #include <asm/dtl.h>
44 #include <asm/vphn.h>
45
46 #include "pseries.h"
47
48 /* Flag bits for H_BULK_REMOVE */
49 #define HBR_REQUEST 0x4000000000000000UL
50 #define HBR_RESPONSE 0x8000000000000000UL
51 #define HBR_END 0xc000000000000000UL
52 #define HBR_AVPN 0x0200000000000000UL
53 #define HBR_ANDCOND 0x0100000000000000UL
54
55
56 /* in hvCall.S */
57 EXPORT_SYMBOL(plpar_hcall);
58 EXPORT_SYMBOL(plpar_hcall9);
59 EXPORT_SYMBOL(plpar_hcall_norets);
60
61 #ifdef CONFIG_PPC_64S_HASH_MMU
62 /*
63 * H_BLOCK_REMOVE supported block size for this page size in segment who's base
64 * page size is that page size.
65 *
66 * The first index is the segment base page size, the second one is the actual
67 * page size.
68 */
69 static int hblkrm_size[MMU_PAGE_COUNT][MMU_PAGE_COUNT] __ro_after_init;
70 #endif
71
72 /*
73 * Due to the involved complexity, and that the current hypervisor is only
74 * returning this value or 0, we are limiting the support of the H_BLOCK_REMOVE
75 * buffer size to 8 size block.
76 */
77 #define HBLKRM_SUPPORTED_BLOCK_SIZE 8
78
79 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
80 static u8 dtl_mask = DTL_LOG_PREEMPT;
81 #else
82 static u8 dtl_mask;
83 #endif
84
85 void alloc_dtl_buffers(unsigned long *time_limit)
86 {
87 int cpu;
88 struct paca_struct *pp;
89 struct dtl_entry *dtl;
90
91 for_each_possible_cpu(cpu) {
92 pp = paca_ptrs[cpu];
93 if (pp->dispatch_log)
94 continue;
95 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
96 if (!dtl) {
97 pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
98 cpu);
99 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
100 pr_warn("Stolen time statistics will be unreliable\n");
101 #endif
102 break;
103 }
104
105 pp->dtl_ridx = 0;
106 pp->dispatch_log = dtl;
107 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
108 pp->dtl_curr = dtl;
109
110 if (time_limit && time_after(jiffies, *time_limit)) {
111 cond_resched();
112 *time_limit = jiffies + HZ;
113 }
114 }
115 }
116
117 void register_dtl_buffer(int cpu)
118 {
119 long ret;
120 struct paca_struct *pp;
121 struct dtl_entry *dtl;
122 int hwcpu = get_hard_smp_processor_id(cpu);
123
124 pp = paca_ptrs[cpu];
125 dtl = pp->dispatch_log;
126 if (dtl && dtl_mask) {
127 pp->dtl_ridx = 0;
128 pp->dtl_curr = dtl;
129 lppaca_of(cpu).dtl_idx = 0;
130
131 /* hypervisor reads buffer length from this field */
132 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
133 ret = register_dtl(hwcpu, __pa(dtl));
134 if (ret)
135 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed with %ld\n",
136 cpu, hwcpu, ret);
137
138 lppaca_of(cpu).dtl_enable_mask = dtl_mask;
139 }
140 }
141
142 #ifdef CONFIG_PPC_SPLPAR
143 struct dtl_worker {
144 struct delayed_work work;
145 int cpu;
146 };
147
148 struct vcpu_dispatch_data {
149 int last_disp_cpu;
150
151 int total_disp;
152
153 int same_cpu_disp;
154 int same_chip_disp;
155 int diff_chip_disp;
156 int far_chip_disp;
157
158 int numa_home_disp;
159 int numa_remote_disp;
160 int numa_far_disp;
161 };
162
163 /*
164 * This represents the number of cpus in the hypervisor. Since there is no
165 * architected way to discover the number of processors in the host, we
166 * provision for dealing with NR_CPUS. This is currently 2048 by default, and
167 * is sufficient for our purposes. This will need to be tweaked if
168 * CONFIG_NR_CPUS is changed.
169 */
170 #define NR_CPUS_H NR_CPUS
171
172 DEFINE_RWLOCK(dtl_access_lock);
173 static DEFINE_PER_CPU(struct vcpu_dispatch_data, vcpu_disp_data);
174 static DEFINE_PER_CPU(u64, dtl_entry_ridx);
175 static DEFINE_PER_CPU(struct dtl_worker, dtl_workers);
176 static enum cpuhp_state dtl_worker_state;
177 static DEFINE_MUTEX(dtl_enable_mutex);
178 static int vcpudispatch_stats_on __read_mostly;
179 static int vcpudispatch_stats_freq = 50;
180 static __be32 *vcpu_associativity, *pcpu_associativity;
181
182
183 static void free_dtl_buffers(unsigned long *time_limit)
184 {
185 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
186 int cpu;
187 struct paca_struct *pp;
188
189 for_each_possible_cpu(cpu) {
190 pp = paca_ptrs[cpu];
191 if (!pp->dispatch_log)
192 continue;
193 kmem_cache_free(dtl_cache, pp->dispatch_log);
194 pp->dtl_ridx = 0;
195 pp->dispatch_log = NULL;
196 pp->dispatch_log_end = NULL;
197 pp->dtl_curr = NULL;
198
199 if (time_limit && time_after(jiffies, *time_limit)) {
200 cond_resched();
201 *time_limit = jiffies + HZ;
202 }
203 }
204 #endif
205 }
206
207 static int init_cpu_associativity(void)
208 {
209 vcpu_associativity = kcalloc(num_possible_cpus() / threads_per_core,
210 VPHN_ASSOC_BUFSIZE * sizeof(__be32), GFP_KERNEL);
211 pcpu_associativity = kcalloc(NR_CPUS_H / threads_per_core,
212 VPHN_ASSOC_BUFSIZE * sizeof(__be32), GFP_KERNEL);
213
214 if (!vcpu_associativity || !pcpu_associativity) {
215 pr_err("error allocating memory for associativity information\n");
216 return -ENOMEM;
217 }
218
219 return 0;
220 }
221
222 static void destroy_cpu_associativity(void)
223 {
224 kfree(vcpu_associativity);
225 kfree(pcpu_associativity);
226 vcpu_associativity = pcpu_associativity = NULL;
227 }
228
229 static __be32 *__get_cpu_associativity(int cpu, __be32 *cpu_assoc, int flag)
230 {
231 __be32 *assoc;
232 int rc = 0;
233
234 assoc = &cpu_assoc[(int)(cpu / threads_per_core) * VPHN_ASSOC_BUFSIZE];
235 if (!assoc[0]) {
236 rc = hcall_vphn(cpu, flag, &assoc[0]);
237 if (rc)
238 return NULL;
239 }
240
241 return assoc;
242 }
243
244 static __be32 *get_pcpu_associativity(int cpu)
245 {
246 return __get_cpu_associativity(cpu, pcpu_associativity, VPHN_FLAG_PCPU);
247 }
248
249 static __be32 *get_vcpu_associativity(int cpu)
250 {
251 return __get_cpu_associativity(cpu, vcpu_associativity, VPHN_FLAG_VCPU);
252 }
253
254 static int cpu_relative_dispatch_distance(int last_disp_cpu, int cur_disp_cpu)
255 {
256 __be32 *last_disp_cpu_assoc, *cur_disp_cpu_assoc;
257
258 if (last_disp_cpu >= NR_CPUS_H || cur_disp_cpu >= NR_CPUS_H)
259 return -EINVAL;
260
261 last_disp_cpu_assoc = get_pcpu_associativity(last_disp_cpu);
262 cur_disp_cpu_assoc = get_pcpu_associativity(cur_disp_cpu);
263
264 if (!last_disp_cpu_assoc || !cur_disp_cpu_assoc)
265 return -EIO;
266
267 return cpu_relative_distance(last_disp_cpu_assoc, cur_disp_cpu_assoc);
268 }
269
270 static int cpu_home_node_dispatch_distance(int disp_cpu)
271 {
272 __be32 *disp_cpu_assoc, *vcpu_assoc;
273 int vcpu_id = smp_processor_id();
274
275 if (disp_cpu >= NR_CPUS_H) {
276 pr_debug_ratelimited("vcpu dispatch cpu %d > %d\n",
277 disp_cpu, NR_CPUS_H);
278 return -EINVAL;
279 }
280
281 disp_cpu_assoc = get_pcpu_associativity(disp_cpu);
282 vcpu_assoc = get_vcpu_associativity(vcpu_id);
283
284 if (!disp_cpu_assoc || !vcpu_assoc)
285 return -EIO;
286
287 return cpu_relative_distance(disp_cpu_assoc, vcpu_assoc);
288 }
289
290 static void update_vcpu_disp_stat(int disp_cpu)
291 {
292 struct vcpu_dispatch_data *disp;
293 int distance;
294
295 disp = this_cpu_ptr(&vcpu_disp_data);
296 if (disp->last_disp_cpu == -1) {
297 disp->last_disp_cpu = disp_cpu;
298 return;
299 }
300
301 disp->total_disp++;
302
303 if (disp->last_disp_cpu == disp_cpu ||
304 (cpu_first_thread_sibling(disp->last_disp_cpu) ==
305 cpu_first_thread_sibling(disp_cpu)))
306 disp->same_cpu_disp++;
307 else {
308 distance = cpu_relative_dispatch_distance(disp->last_disp_cpu,
309 disp_cpu);
310 if (distance < 0)
311 pr_debug_ratelimited("vcpudispatch_stats: cpu %d: error determining associativity\n",
312 smp_processor_id());
313 else {
314 switch (distance) {
315 case 0:
316 disp->same_chip_disp++;
317 break;
318 case 1:
319 disp->diff_chip_disp++;
320 break;
321 case 2:
322 disp->far_chip_disp++;
323 break;
324 default:
325 pr_debug_ratelimited("vcpudispatch_stats: cpu %d (%d -> %d): unexpected relative dispatch distance %d\n",
326 smp_processor_id(),
327 disp->last_disp_cpu,
328 disp_cpu,
329 distance);
330 }
331 }
332 }
333
334 distance = cpu_home_node_dispatch_distance(disp_cpu);
335 if (distance < 0)
336 pr_debug_ratelimited("vcpudispatch_stats: cpu %d: error determining associativity\n",
337 smp_processor_id());
338 else {
339 switch (distance) {
340 case 0:
341 disp->numa_home_disp++;
342 break;
343 case 1:
344 disp->numa_remote_disp++;
345 break;
346 case 2:
347 disp->numa_far_disp++;
348 break;
349 default:
350 pr_debug_ratelimited("vcpudispatch_stats: cpu %d on %d: unexpected numa dispatch distance %d\n",
351 smp_processor_id(),
352 disp_cpu,
353 distance);
354 }
355 }
356
357 disp->last_disp_cpu = disp_cpu;
358 }
359
360 static void process_dtl_buffer(struct work_struct *work)
361 {
362 struct dtl_entry dtle;
363 u64 i = __this_cpu_read(dtl_entry_ridx);
364 struct dtl_entry *dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG);
365 struct dtl_entry *dtl_end = local_paca->dispatch_log_end;
366 struct lppaca *vpa = local_paca->lppaca_ptr;
367 struct dtl_worker *d = container_of(work, struct dtl_worker, work.work);
368
369 if (!local_paca->dispatch_log)
370 return;
371
372 /* if we have been migrated away, we cancel ourself */
373 if (d->cpu != smp_processor_id()) {
374 pr_debug("vcpudispatch_stats: cpu %d worker migrated -- canceling worker\n",
375 smp_processor_id());
376 return;
377 }
378
379 if (i == be64_to_cpu(vpa->dtl_idx))
380 goto out;
381
382 while (i < be64_to_cpu(vpa->dtl_idx)) {
383 dtle = *dtl;
384 barrier();
385 if (i + N_DISPATCH_LOG < be64_to_cpu(vpa->dtl_idx)) {
386 /* buffer has overflowed */
387 pr_debug_ratelimited("vcpudispatch_stats: cpu %d lost %lld DTL samples\n",
388 d->cpu,
389 be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG - i);
390 i = be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG;
391 dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG);
392 continue;
393 }
394 update_vcpu_disp_stat(be16_to_cpu(dtle.processor_id));
395 ++i;
396 ++dtl;
397 if (dtl == dtl_end)
398 dtl = local_paca->dispatch_log;
399 }
400
401 __this_cpu_write(dtl_entry_ridx, i);
402
403 out:
404 schedule_delayed_work_on(d->cpu, to_delayed_work(work),
405 HZ / vcpudispatch_stats_freq);
406 }
407
408 static int dtl_worker_online(unsigned int cpu)
409 {
410 struct dtl_worker *d = &per_cpu(dtl_workers, cpu);
411
412 memset(d, 0, sizeof(*d));
413 INIT_DELAYED_WORK(&d->work, process_dtl_buffer);
414 d->cpu = cpu;
415
416 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
417 per_cpu(dtl_entry_ridx, cpu) = 0;
418 register_dtl_buffer(cpu);
419 #else
420 per_cpu(dtl_entry_ridx, cpu) = be64_to_cpu(lppaca_of(cpu).dtl_idx);
421 #endif
422
423 schedule_delayed_work_on(cpu, &d->work, HZ / vcpudispatch_stats_freq);
424 return 0;
425 }
426
427 static int dtl_worker_offline(unsigned int cpu)
428 {
429 struct dtl_worker *d = &per_cpu(dtl_workers, cpu);
430
431 cancel_delayed_work_sync(&d->work);
432
433 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
434 unregister_dtl(get_hard_smp_processor_id(cpu));
435 #endif
436
437 return 0;
438 }
439
440 static void set_global_dtl_mask(u8 mask)
441 {
442 int cpu;
443
444 dtl_mask = mask;
445 for_each_present_cpu(cpu)
446 lppaca_of(cpu).dtl_enable_mask = dtl_mask;
447 }
448
449 static void reset_global_dtl_mask(void)
450 {
451 int cpu;
452
453 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
454 dtl_mask = DTL_LOG_PREEMPT;
455 #else
456 dtl_mask = 0;
457 #endif
458 for_each_present_cpu(cpu)
459 lppaca_of(cpu).dtl_enable_mask = dtl_mask;
460 }
461
462 static int dtl_worker_enable(unsigned long *time_limit)
463 {
464 int rc = 0, state;
465
466 if (!write_trylock(&dtl_access_lock)) {
467 rc = -EBUSY;
468 goto out;
469 }
470
471 set_global_dtl_mask(DTL_LOG_ALL);
472
473 /* Setup dtl buffers and register those */
474 alloc_dtl_buffers(time_limit);
475
476 state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powerpc/dtl:online",
477 dtl_worker_online, dtl_worker_offline);
478 if (state < 0) {
479 pr_err("vcpudispatch_stats: unable to setup workqueue for DTL processing\n");
480 free_dtl_buffers(time_limit);
481 reset_global_dtl_mask();
482 write_unlock(&dtl_access_lock);
483 rc = -EINVAL;
484 goto out;
485 }
486 dtl_worker_state = state;
487
488 out:
489 return rc;
490 }
491
492 static void dtl_worker_disable(unsigned long *time_limit)
493 {
494 cpuhp_remove_state(dtl_worker_state);
495 free_dtl_buffers(time_limit);
496 reset_global_dtl_mask();
497 write_unlock(&dtl_access_lock);
498 }
499
500 static ssize_t vcpudispatch_stats_write(struct file *file, const char __user *p,
501 size_t count, loff_t *ppos)
502 {
503 unsigned long time_limit = jiffies + HZ;
504 struct vcpu_dispatch_data *disp;
505 int rc, cmd, cpu;
506 char buf[16];
507
508 if (count > 15)
509 return -EINVAL;
510
511 if (copy_from_user(buf, p, count))
512 return -EFAULT;
513
514 buf[count] = 0;
515 rc = kstrtoint(buf, 0, &cmd);
516 if (rc || cmd < 0 || cmd > 1) {
517 pr_err("vcpudispatch_stats: please use 0 to disable or 1 to enable dispatch statistics\n");
518 return rc ? rc : -EINVAL;
519 }
520
521 mutex_lock(&dtl_enable_mutex);
522
523 if ((cmd == 0 && !vcpudispatch_stats_on) ||
524 (cmd == 1 && vcpudispatch_stats_on))
525 goto out;
526
527 if (cmd) {
528 rc = init_cpu_associativity();
529 if (rc) {
530 destroy_cpu_associativity();
531 goto out;
532 }
533
534 for_each_possible_cpu(cpu) {
535 disp = per_cpu_ptr(&vcpu_disp_data, cpu);
536 memset(disp, 0, sizeof(*disp));
537 disp->last_disp_cpu = -1;
538 }
539
540 rc = dtl_worker_enable(&time_limit);
541 if (rc) {
542 destroy_cpu_associativity();
543 goto out;
544 }
545 } else {
546 dtl_worker_disable(&time_limit);
547 destroy_cpu_associativity();
548 }
549
550 vcpudispatch_stats_on = cmd;
551
552 out:
553 mutex_unlock(&dtl_enable_mutex);
554 if (rc)
555 return rc;
556 return count;
557 }
558
559 static int vcpudispatch_stats_display(struct seq_file *p, void *v)
560 {
561 int cpu;
562 struct vcpu_dispatch_data *disp;
563
564 if (!vcpudispatch_stats_on) {
565 seq_puts(p, "off\n");
566 return 0;
567 }
568
569 for_each_online_cpu(cpu) {
570 disp = per_cpu_ptr(&vcpu_disp_data, cpu);
571 seq_printf(p, "cpu%d", cpu);
572 seq_put_decimal_ull(p, " ", disp->total_disp);
573 seq_put_decimal_ull(p, " ", disp->same_cpu_disp);
574 seq_put_decimal_ull(p, " ", disp->same_chip_disp);
575 seq_put_decimal_ull(p, " ", disp->diff_chip_disp);
576 seq_put_decimal_ull(p, " ", disp->far_chip_disp);
577 seq_put_decimal_ull(p, " ", disp->numa_home_disp);
578 seq_put_decimal_ull(p, " ", disp->numa_remote_disp);
579 seq_put_decimal_ull(p, " ", disp->numa_far_disp);
580 seq_puts(p, "\n");
581 }
582
583 return 0;
584 }
585
586 static int vcpudispatch_stats_open(struct inode *inode, struct file *file)
587 {
588 return single_open(file, vcpudispatch_stats_display, NULL);
589 }
590
591 static const struct proc_ops vcpudispatch_stats_proc_ops = {
592 .proc_open = vcpudispatch_stats_open,
593 .proc_read = seq_read,
594 .proc_write = vcpudispatch_stats_write,
595 .proc_lseek = seq_lseek,
596 .proc_release = single_release,
597 };
598
599 static ssize_t vcpudispatch_stats_freq_write(struct file *file,
600 const char __user *p, size_t count, loff_t *ppos)
601 {
602 int rc, freq;
603 char buf[16];
604
605 if (count > 15)
606 return -EINVAL;
607
608 if (copy_from_user(buf, p, count))
609 return -EFAULT;
610
611 buf[count] = 0;
612 rc = kstrtoint(buf, 0, &freq);
613 if (rc || freq < 1 || freq > HZ) {
614 pr_err("vcpudispatch_stats_freq: please specify a frequency between 1 and %d\n",
615 HZ);
616 return rc ? rc : -EINVAL;
617 }
618
619 vcpudispatch_stats_freq = freq;
620
621 return count;
622 }
623
624 static int vcpudispatch_stats_freq_display(struct seq_file *p, void *v)
625 {
626 seq_printf(p, "%d\n", vcpudispatch_stats_freq);
627 return 0;
628 }
629
630 static int vcpudispatch_stats_freq_open(struct inode *inode, struct file *file)
631 {
632 return single_open(file, vcpudispatch_stats_freq_display, NULL);
633 }
634
635 static const struct proc_ops vcpudispatch_stats_freq_proc_ops = {
636 .proc_open = vcpudispatch_stats_freq_open,
637 .proc_read = seq_read,
638 .proc_write = vcpudispatch_stats_freq_write,
639 .proc_lseek = seq_lseek,
640 .proc_release = single_release,
641 };
642
643 static int __init vcpudispatch_stats_procfs_init(void)
644 {
645 if (!lppaca_shared_proc())
646 return 0;
647
648 if (!proc_create("powerpc/vcpudispatch_stats", 0600, NULL,
649 &vcpudispatch_stats_proc_ops))
650 pr_err("vcpudispatch_stats: error creating procfs file\n");
651 else if (!proc_create("powerpc/vcpudispatch_stats_freq", 0600, NULL,
652 &vcpudispatch_stats_freq_proc_ops))
653 pr_err("vcpudispatch_stats_freq: error creating procfs file\n");
654
655 return 0;
656 }
657
658 machine_device_initcall(pseries, vcpudispatch_stats_procfs_init);
659
660 #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
661 u64 pseries_paravirt_steal_clock(int cpu)
662 {
663 struct lppaca *lppaca = &lppaca_of(cpu);
664
665 /*
666 * VPA steal time counters are reported at TB frequency. Hence do a
667 * conversion to ns before returning
668 */
669 return tb_to_ns(be64_to_cpu(READ_ONCE(lppaca->enqueue_dispatch_tb)) +
670 be64_to_cpu(READ_ONCE(lppaca->ready_enqueue_tb)));
671 }
672 #endif
673
674 #endif /* CONFIG_PPC_SPLPAR */
675
676 void vpa_init(int cpu)
677 {
678 int hwcpu = get_hard_smp_processor_id(cpu);
679 unsigned long addr;
680 long ret;
681
682 /*
683 * The spec says it "may be problematic" if CPU x registers the VPA of
684 * CPU y. We should never do that, but wail if we ever do.
685 */
686 WARN_ON(cpu != smp_processor_id());
687
688 if (cpu_has_feature(CPU_FTR_ALTIVEC))
689 lppaca_of(cpu).vmxregs_in_use = 1;
690
691 if (cpu_has_feature(CPU_FTR_ARCH_207S))
692 lppaca_of(cpu).ebb_regs_in_use = 1;
693
694 addr = __pa(&lppaca_of(cpu));
695 ret = register_vpa(hwcpu, addr);
696
697 if (ret) {
698 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
699 "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
700 return;
701 }
702
703 #ifdef CONFIG_PPC_64S_HASH_MMU
704 /*
705 * PAPR says this feature is SLB-Buffer but firmware never
706 * reports that. All SPLPAR support SLB shadow buffer.
707 */
708 if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) {
709 addr = __pa(paca_ptrs[cpu]->slb_shadow_ptr);
710 ret = register_slb_shadow(hwcpu, addr);
711 if (ret)
712 pr_err("WARNING: SLB shadow buffer registration for "
713 "cpu %d (hw %d) of area %lx failed with %ld\n",
714 cpu, hwcpu, addr, ret);
715 }
716 #endif /* CONFIG_PPC_64S_HASH_MMU */
717
718 /*
719 * Register dispatch trace log, if one has been allocated.
720 */
721 register_dtl_buffer(cpu);
722 }
723
724 #ifdef CONFIG_PPC_BOOK3S_64
725
726 static int __init pseries_lpar_register_process_table(unsigned long base,
727 unsigned long page_size, unsigned long table_size)
728 {
729 long rc;
730 unsigned long flags = 0;
731
732 if (table_size)
733 flags |= PROC_TABLE_NEW;
734 if (radix_enabled()) {
735 flags |= PROC_TABLE_RADIX;
736 if (mmu_has_feature(MMU_FTR_GTSE))
737 flags |= PROC_TABLE_GTSE;
738 } else
739 flags |= PROC_TABLE_HPT_SLB;
740 for (;;) {
741 rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base,
742 page_size, table_size);
743 if (!H_IS_LONG_BUSY(rc))
744 break;
745 mdelay(get_longbusy_msecs(rc));
746 }
747 if (rc != H_SUCCESS) {
748 pr_err("Failed to register process table (rc=%ld)\n", rc);
749 BUG();
750 }
751 return rc;
752 }
753
754 #ifdef CONFIG_PPC_64S_HASH_MMU
755
756 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
757 unsigned long vpn, unsigned long pa,
758 unsigned long rflags, unsigned long vflags,
759 int psize, int apsize, int ssize)
760 {
761 unsigned long lpar_rc;
762 unsigned long flags;
763 unsigned long slot;
764 unsigned long hpte_v, hpte_r;
765
766 if (!(vflags & HPTE_V_BOLTED))
767 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
768 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
769 hpte_group, vpn, pa, rflags, vflags, psize);
770
771 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
772 hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
773
774 if (!(vflags & HPTE_V_BOLTED))
775 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
776
777 /* Now fill in the actual HPTE */
778 /* Set CEC cookie to 0 */
779 /* Zero page = 0 */
780 /* I-cache Invalidate = 0 */
781 /* I-cache synchronize = 0 */
782 /* Exact = 0 */
783 flags = 0;
784
785 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
786 flags |= H_COALESCE_CAND;
787
788 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
789 if (unlikely(lpar_rc == H_PTEG_FULL)) {
790 pr_devel("Hash table group is full\n");
791 return -1;
792 }
793
794 /*
795 * Since we try and ioremap PHBs we don't own, the pte insert
796 * will fail. However we must catch the failure in hash_page
797 * or we will loop forever, so return -2 in this case.
798 */
799 if (unlikely(lpar_rc != H_SUCCESS)) {
800 pr_err("Failed hash pte insert with error %ld\n", lpar_rc);
801 return -2;
802 }
803 if (!(vflags & HPTE_V_BOLTED))
804 pr_devel(" -> slot: %lu\n", slot & 7);
805
806 /* Because of iSeries, we have to pass down the secondary
807 * bucket bit here as well
808 */
809 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
810 }
811
812 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
813
814 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
815 {
816 unsigned long slot_offset;
817 unsigned long lpar_rc;
818 int i;
819 unsigned long dummy1, dummy2;
820
821 /* pick a random slot to start at */
822 slot_offset = mftb() & 0x7;
823
824 for (i = 0; i < HPTES_PER_GROUP; i++) {
825
826 /* don't remove a bolted entry */
827 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
828 HPTE_V_BOLTED, &dummy1, &dummy2);
829 if (lpar_rc == H_SUCCESS)
830 return i;
831
832 /*
833 * The test for adjunct partition is performed before the
834 * ANDCOND test. H_RESOURCE may be returned, so we need to
835 * check for that as well.
836 */
837 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
838
839 slot_offset++;
840 slot_offset &= 0x7;
841 }
842
843 return -1;
844 }
845
846 /* Called during kexec sequence with MMU off */
847 static notrace void manual_hpte_clear_all(void)
848 {
849 unsigned long size_bytes = 1UL << ppc64_pft_size;
850 unsigned long hpte_count = size_bytes >> 4;
851 struct {
852 unsigned long pteh;
853 unsigned long ptel;
854 } ptes[4];
855 long lpar_rc;
856 unsigned long i, j;
857
858 /* Read in batches of 4,
859 * invalidate only valid entries not in the VRMA
860 * hpte_count will be a multiple of 4
861 */
862 for (i = 0; i < hpte_count; i += 4) {
863 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
864 if (lpar_rc != H_SUCCESS) {
865 pr_info("Failed to read hash page table at %ld err %ld\n",
866 i, lpar_rc);
867 continue;
868 }
869 for (j = 0; j < 4; j++){
870 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
871 HPTE_V_VRMA_MASK)
872 continue;
873 if (ptes[j].pteh & HPTE_V_VALID)
874 plpar_pte_remove_raw(0, i + j, 0,
875 &(ptes[j].pteh), &(ptes[j].ptel));
876 }
877 }
878 }
879
880 /* Called during kexec sequence with MMU off */
881 static notrace int hcall_hpte_clear_all(void)
882 {
883 int rc;
884
885 do {
886 rc = plpar_hcall_norets(H_CLEAR_HPT);
887 } while (rc == H_CONTINUE);
888
889 return rc;
890 }
891
892 /* Called during kexec sequence with MMU off */
893 static notrace void pseries_hpte_clear_all(void)
894 {
895 int rc;
896
897 rc = hcall_hpte_clear_all();
898 if (rc != H_SUCCESS)
899 manual_hpte_clear_all();
900
901 #ifdef __LITTLE_ENDIAN__
902 /*
903 * Reset exceptions to big endian.
904 *
905 * FIXME this is a hack for kexec, we need to reset the exception
906 * endian before starting the new kernel and this is a convenient place
907 * to do it.
908 *
909 * This is also called on boot when a fadump happens. In that case we
910 * must not change the exception endian mode.
911 */
912 if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active())
913 pseries_big_endian_exceptions();
914 #endif
915 }
916
917 /*
918 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
919 * the low 3 bits of flags happen to line up. So no transform is needed.
920 * We can probably optimize here and assume the high bits of newpp are
921 * already zero. For now I am paranoid.
922 */
923 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
924 unsigned long newpp,
925 unsigned long vpn,
926 int psize, int apsize,
927 int ssize, unsigned long inv_flags)
928 {
929 unsigned long lpar_rc;
930 unsigned long flags;
931 unsigned long want_v;
932
933 want_v = hpte_encode_avpn(vpn, psize, ssize);
934
935 flags = (newpp & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO)) | H_AVPN;
936 flags |= (newpp & HPTE_R_KEY_HI) >> 48;
937 if (mmu_has_feature(MMU_FTR_KERNEL_RO))
938 /* Move pp0 into bit 8 (IBM 55) */
939 flags |= (newpp & HPTE_R_PP0) >> 55;
940
941 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
942 want_v, slot, flags, psize);
943
944 lpar_rc = plpar_pte_protect(flags, slot, want_v);
945
946 if (lpar_rc == H_NOT_FOUND) {
947 pr_devel("not found !\n");
948 return -1;
949 }
950
951 pr_devel("ok\n");
952
953 BUG_ON(lpar_rc != H_SUCCESS);
954
955 return 0;
956 }
957
958 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group)
959 {
960 long lpar_rc;
961 unsigned long i, j;
962 struct {
963 unsigned long pteh;
964 unsigned long ptel;
965 } ptes[4];
966
967 for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
968
969 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
970 if (lpar_rc != H_SUCCESS) {
971 pr_info("Failed to read hash page table at %ld err %ld\n",
972 hpte_group, lpar_rc);
973 continue;
974 }
975
976 for (j = 0; j < 4; j++) {
977 if (HPTE_V_COMPARE(ptes[j].pteh, want_v) &&
978 (ptes[j].pteh & HPTE_V_VALID))
979 return i + j;
980 }
981 }
982
983 return -1;
984 }
985
986 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
987 {
988 long slot;
989 unsigned long hash;
990 unsigned long want_v;
991 unsigned long hpte_group;
992
993 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
994 want_v = hpte_encode_avpn(vpn, psize, ssize);
995
996 /*
997 * We try to keep bolted entries always in primary hash
998 * But in some case we can find them in secondary too.
999 */
1000 hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
1001 slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
1002 if (slot < 0) {
1003 /* Try in secondary */
1004 hpte_group = (~hash & htab_hash_mask) * HPTES_PER_GROUP;
1005 slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
1006 if (slot < 0)
1007 return -1;
1008 }
1009 return hpte_group + slot;
1010 }
1011
1012 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
1013 unsigned long ea,
1014 int psize, int ssize)
1015 {
1016 unsigned long vpn;
1017 unsigned long lpar_rc, slot, vsid, flags;
1018
1019 vsid = get_kernel_vsid(ea, ssize);
1020 vpn = hpt_vpn(ea, vsid, ssize);
1021
1022 slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
1023 BUG_ON(slot == -1);
1024
1025 flags = newpp & (HPTE_R_PP | HPTE_R_N);
1026 if (mmu_has_feature(MMU_FTR_KERNEL_RO))
1027 /* Move pp0 into bit 8 (IBM 55) */
1028 flags |= (newpp & HPTE_R_PP0) >> 55;
1029
1030 flags |= ((newpp & HPTE_R_KEY_HI) >> 48) | (newpp & HPTE_R_KEY_LO);
1031
1032 lpar_rc = plpar_pte_protect(flags, slot, 0);
1033
1034 BUG_ON(lpar_rc != H_SUCCESS);
1035 }
1036
1037 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
1038 int psize, int apsize,
1039 int ssize, int local)
1040 {
1041 unsigned long want_v;
1042 unsigned long lpar_rc;
1043 unsigned long dummy1, dummy2;
1044
1045 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
1046 slot, vpn, psize, local);
1047
1048 want_v = hpte_encode_avpn(vpn, psize, ssize);
1049 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
1050 if (lpar_rc == H_NOT_FOUND)
1051 return;
1052
1053 BUG_ON(lpar_rc != H_SUCCESS);
1054 }
1055
1056
1057 /*
1058 * As defined in the PAPR's section 14.5.4.1.8
1059 * The control mask doesn't include the returned reference and change bit from
1060 * the processed PTE.
1061 */
1062 #define HBLKR_AVPN 0x0100000000000000UL
1063 #define HBLKR_CTRL_MASK 0xf800000000000000UL
1064 #define HBLKR_CTRL_SUCCESS 0x8000000000000000UL
1065 #define HBLKR_CTRL_ERRNOTFOUND 0x8800000000000000UL
1066 #define HBLKR_CTRL_ERRBUSY 0xa000000000000000UL
1067
1068 /*
1069 * Returned true if we are supporting this block size for the specified segment
1070 * base page size and actual page size.
1071 *
1072 * Currently, we only support 8 size block.
1073 */
1074 static inline bool is_supported_hlbkrm(int bpsize, int psize)
1075 {
1076 return (hblkrm_size[bpsize][psize] == HBLKRM_SUPPORTED_BLOCK_SIZE);
1077 }
1078
1079 /**
1080 * H_BLOCK_REMOVE caller.
1081 * @idx should point to the latest @param entry set with a PTEX.
1082 * If PTE cannot be processed because another CPUs has already locked that
1083 * group, those entries are put back in @param starting at index 1.
1084 * If entries has to be retried and @retry_busy is set to true, these entries
1085 * are retried until success. If @retry_busy is set to false, the returned
1086 * is the number of entries yet to process.
1087 */
1088 static unsigned long call_block_remove(unsigned long idx, unsigned long *param,
1089 bool retry_busy)
1090 {
1091 unsigned long i, rc, new_idx;
1092 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
1093
1094 if (idx < 2) {
1095 pr_warn("Unexpected empty call to H_BLOCK_REMOVE");
1096 return 0;
1097 }
1098 again:
1099 new_idx = 0;
1100 if (idx > PLPAR_HCALL9_BUFSIZE) {
1101 pr_err("Too many PTEs (%lu) for H_BLOCK_REMOVE", idx);
1102 idx = PLPAR_HCALL9_BUFSIZE;
1103 } else if (idx < PLPAR_HCALL9_BUFSIZE)
1104 param[idx] = HBR_END;
1105
1106 rc = plpar_hcall9(H_BLOCK_REMOVE, retbuf,
1107 param[0], /* AVA */
1108 param[1], param[2], param[3], param[4], /* TS0-7 */
1109 param[5], param[6], param[7], param[8]);
1110 if (rc == H_SUCCESS)
1111 return 0;
1112
1113 BUG_ON(rc != H_PARTIAL);
1114
1115 /* Check that the unprocessed entries were 'not found' or 'busy' */
1116 for (i = 0; i < idx-1; i++) {
1117 unsigned long ctrl = retbuf[i] & HBLKR_CTRL_MASK;
1118
1119 if (ctrl == HBLKR_CTRL_ERRBUSY) {
1120 param[++new_idx] = param[i+1];
1121 continue;
1122 }
1123
1124 BUG_ON(ctrl != HBLKR_CTRL_SUCCESS
1125 && ctrl != HBLKR_CTRL_ERRNOTFOUND);
1126 }
1127
1128 /*
1129 * If there were entries found busy, retry these entries if requested,
1130 * of if all the entries have to be retried.
1131 */
1132 if (new_idx && (retry_busy || new_idx == (PLPAR_HCALL9_BUFSIZE-1))) {
1133 idx = new_idx + 1;
1134 goto again;
1135 }
1136
1137 return new_idx;
1138 }
1139
1140 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1141 /*
1142 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
1143 * to make sure that we avoid bouncing the hypervisor tlbie lock.
1144 */
1145 #define PPC64_HUGE_HPTE_BATCH 12
1146
1147 static void hugepage_block_invalidate(unsigned long *slot, unsigned long *vpn,
1148 int count, int psize, int ssize)
1149 {
1150 unsigned long param[PLPAR_HCALL9_BUFSIZE];
1151 unsigned long shift, current_vpgb, vpgb;
1152 int i, pix = 0;
1153
1154 shift = mmu_psize_defs[psize].shift;
1155
1156 for (i = 0; i < count; i++) {
1157 /*
1158 * Shifting 3 bits more on the right to get a
1159 * 8 pages aligned virtual addresse.
1160 */
1161 vpgb = (vpn[i] >> (shift - VPN_SHIFT + 3));
1162 if (!pix || vpgb != current_vpgb) {
1163 /*
1164 * Need to start a new 8 pages block, flush
1165 * the current one if needed.
1166 */
1167 if (pix)
1168 (void)call_block_remove(pix, param, true);
1169 current_vpgb = vpgb;
1170 param[0] = hpte_encode_avpn(vpn[i], psize, ssize);
1171 pix = 1;
1172 }
1173
1174 param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot[i];
1175 if (pix == PLPAR_HCALL9_BUFSIZE) {
1176 pix = call_block_remove(pix, param, false);
1177 /*
1178 * pix = 0 means that all the entries were
1179 * removed, we can start a new block.
1180 * Otherwise, this means that there are entries
1181 * to retry, and pix points to latest one, so
1182 * we should increment it and try to continue
1183 * the same block.
1184 */
1185 if (pix)
1186 pix++;
1187 }
1188 }
1189 if (pix)
1190 (void)call_block_remove(pix, param, true);
1191 }
1192
1193 static void hugepage_bulk_invalidate(unsigned long *slot, unsigned long *vpn,
1194 int count, int psize, int ssize)
1195 {
1196 unsigned long param[PLPAR_HCALL9_BUFSIZE];
1197 int i = 0, pix = 0, rc;
1198
1199 for (i = 0; i < count; i++) {
1200
1201 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
1202 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
1203 ssize, 0);
1204 } else {
1205 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
1206 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
1207 pix += 2;
1208 if (pix == 8) {
1209 rc = plpar_hcall9(H_BULK_REMOVE, param,
1210 param[0], param[1], param[2],
1211 param[3], param[4], param[5],
1212 param[6], param[7]);
1213 BUG_ON(rc != H_SUCCESS);
1214 pix = 0;
1215 }
1216 }
1217 }
1218 if (pix) {
1219 param[pix] = HBR_END;
1220 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
1221 param[2], param[3], param[4], param[5],
1222 param[6], param[7]);
1223 BUG_ON(rc != H_SUCCESS);
1224 }
1225 }
1226
1227 static inline void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
1228 unsigned long *vpn,
1229 int count, int psize,
1230 int ssize)
1231 {
1232 unsigned long flags = 0;
1233 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
1234
1235 if (lock_tlbie)
1236 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
1237
1238 /* Assuming THP size is 16M */
1239 if (is_supported_hlbkrm(psize, MMU_PAGE_16M))
1240 hugepage_block_invalidate(slot, vpn, count, psize, ssize);
1241 else
1242 hugepage_bulk_invalidate(slot, vpn, count, psize, ssize);
1243
1244 if (lock_tlbie)
1245 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
1246 }
1247
1248 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
1249 unsigned long addr,
1250 unsigned char *hpte_slot_array,
1251 int psize, int ssize, int local)
1252 {
1253 int i, index = 0;
1254 unsigned long s_addr = addr;
1255 unsigned int max_hpte_count, valid;
1256 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
1257 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
1258 unsigned long shift, hidx, vpn = 0, hash, slot;
1259
1260 shift = mmu_psize_defs[psize].shift;
1261 max_hpte_count = 1U << (PMD_SHIFT - shift);
1262
1263 for (i = 0; i < max_hpte_count; i++) {
1264 valid = hpte_valid(hpte_slot_array, i);
1265 if (!valid)
1266 continue;
1267 hidx = hpte_hash_index(hpte_slot_array, i);
1268
1269 /* get the vpn */
1270 addr = s_addr + (i * (1ul << shift));
1271 vpn = hpt_vpn(addr, vsid, ssize);
1272 hash = hpt_hash(vpn, shift, ssize);
1273 if (hidx & _PTEIDX_SECONDARY)
1274 hash = ~hash;
1275
1276 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
1277 slot += hidx & _PTEIDX_GROUP_IX;
1278
1279 slot_array[index] = slot;
1280 vpn_array[index] = vpn;
1281 if (index == PPC64_HUGE_HPTE_BATCH - 1) {
1282 /*
1283 * Now do a bluk invalidate
1284 */
1285 __pSeries_lpar_hugepage_invalidate(slot_array,
1286 vpn_array,
1287 PPC64_HUGE_HPTE_BATCH,
1288 psize, ssize);
1289 index = 0;
1290 } else
1291 index++;
1292 }
1293 if (index)
1294 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
1295 index, psize, ssize);
1296 }
1297 #else
1298 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
1299 unsigned long addr,
1300 unsigned char *hpte_slot_array,
1301 int psize, int ssize, int local)
1302 {
1303 WARN(1, "%s called without THP support\n", __func__);
1304 }
1305 #endif
1306
1307 static int pSeries_lpar_hpte_removebolted(unsigned long ea,
1308 int psize, int ssize)
1309 {
1310 unsigned long vpn;
1311 unsigned long slot, vsid;
1312
1313 vsid = get_kernel_vsid(ea, ssize);
1314 vpn = hpt_vpn(ea, vsid, ssize);
1315
1316 slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
1317 if (slot == -1)
1318 return -ENOENT;
1319
1320 /*
1321 * lpar doesn't use the passed actual page size
1322 */
1323 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
1324 return 0;
1325 }
1326
1327
1328 static inline unsigned long compute_slot(real_pte_t pte,
1329 unsigned long vpn,
1330 unsigned long index,
1331 unsigned long shift,
1332 int ssize)
1333 {
1334 unsigned long slot, hash, hidx;
1335
1336 hash = hpt_hash(vpn, shift, ssize);
1337 hidx = __rpte_to_hidx(pte, index);
1338 if (hidx & _PTEIDX_SECONDARY)
1339 hash = ~hash;
1340 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
1341 slot += hidx & _PTEIDX_GROUP_IX;
1342 return slot;
1343 }
1344
1345 /**
1346 * The hcall H_BLOCK_REMOVE implies that the virtual pages to processed are
1347 * "all within the same naturally aligned 8 page virtual address block".
1348 */
1349 static void do_block_remove(unsigned long number, struct ppc64_tlb_batch *batch,
1350 unsigned long *param)
1351 {
1352 unsigned long vpn;
1353 unsigned long i, pix = 0;
1354 unsigned long index, shift, slot, current_vpgb, vpgb;
1355 real_pte_t pte;
1356 int psize, ssize;
1357
1358 psize = batch->psize;
1359 ssize = batch->ssize;
1360
1361 for (i = 0; i < number; i++) {
1362 vpn = batch->vpn[i];
1363 pte = batch->pte[i];
1364 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
1365 /*
1366 * Shifting 3 bits more on the right to get a
1367 * 8 pages aligned virtual addresse.
1368 */
1369 vpgb = (vpn >> (shift - VPN_SHIFT + 3));
1370 if (!pix || vpgb != current_vpgb) {
1371 /*
1372 * Need to start a new 8 pages block, flush
1373 * the current one if needed.
1374 */
1375 if (pix)
1376 (void)call_block_remove(pix, param,
1377 true);
1378 current_vpgb = vpgb;
1379 param[0] = hpte_encode_avpn(vpn, psize,
1380 ssize);
1381 pix = 1;
1382 }
1383
1384 slot = compute_slot(pte, vpn, index, shift, ssize);
1385 param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot;
1386
1387 if (pix == PLPAR_HCALL9_BUFSIZE) {
1388 pix = call_block_remove(pix, param, false);
1389 /*
1390 * pix = 0 means that all the entries were
1391 * removed, we can start a new block.
1392 * Otherwise, this means that there are entries
1393 * to retry, and pix points to latest one, so
1394 * we should increment it and try to continue
1395 * the same block.
1396 */
1397 if (pix)
1398 pix++;
1399 }
1400 } pte_iterate_hashed_end();
1401 }
1402
1403 if (pix)
1404 (void)call_block_remove(pix, param, true);
1405 }
1406
1407 /*
1408 * TLB Block Invalidate Characteristics
1409 *
1410 * These characteristics define the size of the block the hcall H_BLOCK_REMOVE
1411 * is able to process for each couple segment base page size, actual page size.
1412 *
1413 * The ibm,get-system-parameter properties is returning a buffer with the
1414 * following layout:
1415 *
1416 * [ 2 bytes size of the RTAS buffer (excluding these 2 bytes) ]
1417 * -----------------
1418 * TLB Block Invalidate Specifiers:
1419 * [ 1 byte LOG base 2 of the TLB invalidate block size being specified ]
1420 * [ 1 byte Number of page sizes (N) that are supported for the specified
1421 * TLB invalidate block size ]
1422 * [ 1 byte Encoded segment base page size and actual page size
1423 * MSB=0 means 4k segment base page size and actual page size
1424 * MSB=1 the penc value in mmu_psize_def ]
1425 * ...
1426 * -----------------
1427 * Next TLB Block Invalidate Specifiers...
1428 * -----------------
1429 * [ 0 ]
1430 */
1431 static inline void set_hblkrm_bloc_size(int bpsize, int psize,
1432 unsigned int block_size)
1433 {
1434 if (block_size > hblkrm_size[bpsize][psize])
1435 hblkrm_size[bpsize][psize] = block_size;
1436 }
1437
1438 /*
1439 * Decode the Encoded segment base page size and actual page size.
1440 * PAPR specifies:
1441 * - bit 7 is the L bit
1442 * - bits 0-5 are the penc value
1443 * If the L bit is 0, this means 4K segment base page size and actual page size
1444 * otherwise the penc value should be read.
1445 */
1446 #define HBLKRM_L_MASK 0x80
1447 #define HBLKRM_PENC_MASK 0x3f
1448 static inline void __init check_lp_set_hblkrm(unsigned int lp,
1449 unsigned int block_size)
1450 {
1451 unsigned int bpsize, psize;
1452
1453 /* First, check the L bit, if not set, this means 4K */
1454 if ((lp & HBLKRM_L_MASK) == 0) {
1455 set_hblkrm_bloc_size(MMU_PAGE_4K, MMU_PAGE_4K, block_size);
1456 return;
1457 }
1458
1459 lp &= HBLKRM_PENC_MASK;
1460 for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++) {
1461 struct mmu_psize_def *def = &mmu_psize_defs[bpsize];
1462
1463 for (psize = 0; psize < MMU_PAGE_COUNT; psize++) {
1464 if (def->penc[psize] == lp) {
1465 set_hblkrm_bloc_size(bpsize, psize, block_size);
1466 return;
1467 }
1468 }
1469 }
1470 }
1471
1472 /*
1473 * The size of the TLB Block Invalidate Characteristics is variable. But at the
1474 * maximum it will be the number of possible page sizes *2 + 10 bytes.
1475 * Currently MMU_PAGE_COUNT is 16, which means 42 bytes. Use a cache line size
1476 * (128 bytes) for the buffer to get plenty of space.
1477 */
1478 #define SPLPAR_TLB_BIC_MAXLENGTH 128
1479
1480 void __init pseries_lpar_read_hblkrm_characteristics(void)
1481 {
1482 static struct papr_sysparm_buf buf __initdata;
1483 int len, idx, bpsize;
1484
1485 if (!firmware_has_feature(FW_FEATURE_BLOCK_REMOVE))
1486 return;
1487
1488 if (papr_sysparm_get(PAPR_SYSPARM_TLB_BLOCK_INVALIDATE_ATTRS, &buf))
1489 return;
1490
1491 len = be16_to_cpu(buf.len);
1492 if (len > SPLPAR_TLB_BIC_MAXLENGTH) {
1493 pr_warn("%s too large returned buffer %d", __func__, len);
1494 return;
1495 }
1496
1497 idx = 0;
1498 while (idx < len) {
1499 u8 block_shift = buf.val[idx++];
1500 u32 block_size;
1501 unsigned int npsize;
1502
1503 if (!block_shift)
1504 break;
1505
1506 block_size = 1 << block_shift;
1507
1508 for (npsize = buf.val[idx++];
1509 npsize > 0 && idx < len; npsize--)
1510 check_lp_set_hblkrm((unsigned int)buf.val[idx++],
1511 block_size);
1512 }
1513
1514 for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++)
1515 for (idx = 0; idx < MMU_PAGE_COUNT; idx++)
1516 if (hblkrm_size[bpsize][idx])
1517 pr_info("H_BLOCK_REMOVE supports base psize:%d psize:%d block size:%d",
1518 bpsize, idx, hblkrm_size[bpsize][idx]);
1519 }
1520
1521 /*
1522 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
1523 * lock.
1524 */
1525 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
1526 {
1527 unsigned long vpn;
1528 unsigned long i, pix, rc;
1529 unsigned long flags = 0;
1530 struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
1531 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
1532 unsigned long param[PLPAR_HCALL9_BUFSIZE];
1533 unsigned long index, shift, slot;
1534 real_pte_t pte;
1535 int psize, ssize;
1536
1537 if (lock_tlbie)
1538 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
1539
1540 if (is_supported_hlbkrm(batch->psize, batch->psize)) {
1541 do_block_remove(number, batch, param);
1542 goto out;
1543 }
1544
1545 psize = batch->psize;
1546 ssize = batch->ssize;
1547 pix = 0;
1548 for (i = 0; i < number; i++) {
1549 vpn = batch->vpn[i];
1550 pte = batch->pte[i];
1551 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
1552 slot = compute_slot(pte, vpn, index, shift, ssize);
1553 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
1554 /*
1555 * lpar doesn't use the passed actual page size
1556 */
1557 pSeries_lpar_hpte_invalidate(slot, vpn, psize,
1558 0, ssize, local);
1559 } else {
1560 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
1561 param[pix+1] = hpte_encode_avpn(vpn, psize,
1562 ssize);
1563 pix += 2;
1564 if (pix == 8) {
1565 rc = plpar_hcall9(H_BULK_REMOVE, param,
1566 param[0], param[1], param[2],
1567 param[3], param[4], param[5],
1568 param[6], param[7]);
1569 BUG_ON(rc != H_SUCCESS);
1570 pix = 0;
1571 }
1572 }
1573 } pte_iterate_hashed_end();
1574 }
1575 if (pix) {
1576 param[pix] = HBR_END;
1577 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
1578 param[2], param[3], param[4], param[5],
1579 param[6], param[7]);
1580 BUG_ON(rc != H_SUCCESS);
1581 }
1582
1583 out:
1584 if (lock_tlbie)
1585 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
1586 }
1587
1588 static int __init disable_bulk_remove(char *str)
1589 {
1590 if (strcmp(str, "off") == 0 &&
1591 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
1592 pr_info("Disabling BULK_REMOVE firmware feature");
1593 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
1594 }
1595 return 1;
1596 }
1597
1598 __setup("bulk_remove=", disable_bulk_remove);
1599
1600 #define HPT_RESIZE_TIMEOUT 10000 /* ms */
1601
1602 struct hpt_resize_state {
1603 unsigned long shift;
1604 int commit_rc;
1605 };
1606
1607 static int pseries_lpar_resize_hpt_commit(void *data)
1608 {
1609 struct hpt_resize_state *state = data;
1610
1611 state->commit_rc = plpar_resize_hpt_commit(0, state->shift);
1612 if (state->commit_rc != H_SUCCESS)
1613 return -EIO;
1614
1615 /* Hypervisor has transitioned the HTAB, update our globals */
1616 ppc64_pft_size = state->shift;
1617 htab_size_bytes = 1UL << ppc64_pft_size;
1618 htab_hash_mask = (htab_size_bytes >> 7) - 1;
1619
1620 return 0;
1621 }
1622
1623 /*
1624 * Must be called in process context. The caller must hold the
1625 * cpus_lock.
1626 */
1627 static int pseries_lpar_resize_hpt(unsigned long shift)
1628 {
1629 struct hpt_resize_state state = {
1630 .shift = shift,
1631 .commit_rc = H_FUNCTION,
1632 };
1633 unsigned int delay, total_delay = 0;
1634 int rc;
1635 ktime_t t0, t1, t2;
1636
1637 might_sleep();
1638
1639 if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE))
1640 return -ENODEV;
1641
1642 pr_info("Attempting to resize HPT to shift %lu\n", shift);
1643
1644 t0 = ktime_get();
1645
1646 rc = plpar_resize_hpt_prepare(0, shift);
1647 while (H_IS_LONG_BUSY(rc)) {
1648 delay = get_longbusy_msecs(rc);
1649 total_delay += delay;
1650 if (total_delay > HPT_RESIZE_TIMEOUT) {
1651 /* prepare with shift==0 cancels an in-progress resize */
1652 rc = plpar_resize_hpt_prepare(0, 0);
1653 if (rc != H_SUCCESS)
1654 pr_warn("Unexpected error %d cancelling timed out HPT resize\n",
1655 rc);
1656 return -ETIMEDOUT;
1657 }
1658 msleep(delay);
1659 rc = plpar_resize_hpt_prepare(0, shift);
1660 }
1661
1662 switch (rc) {
1663 case H_SUCCESS:
1664 /* Continue on */
1665 break;
1666
1667 case H_PARAMETER:
1668 pr_warn("Invalid argument from H_RESIZE_HPT_PREPARE\n");
1669 return -EINVAL;
1670 case H_RESOURCE:
1671 pr_warn("Operation not permitted from H_RESIZE_HPT_PREPARE\n");
1672 return -EPERM;
1673 default:
1674 pr_warn("Unexpected error %d from H_RESIZE_HPT_PREPARE\n", rc);
1675 return -EIO;
1676 }
1677
1678 t1 = ktime_get();
1679
1680 rc = stop_machine_cpuslocked(pseries_lpar_resize_hpt_commit,
1681 &state, NULL);
1682
1683 t2 = ktime_get();
1684
1685 if (rc != 0) {
1686 switch (state.commit_rc) {
1687 case H_PTEG_FULL:
1688 return -ENOSPC;
1689
1690 default:
1691 pr_warn("Unexpected error %d from H_RESIZE_HPT_COMMIT\n",
1692 state.commit_rc);
1693 return -EIO;
1694 };
1695 }
1696
1697 pr_info("HPT resize to shift %lu complete (%lld ms / %lld ms)\n",
1698 shift, (long long) ktime_ms_delta(t1, t0),
1699 (long long) ktime_ms_delta(t2, t1));
1700
1701 return 0;
1702 }
1703
1704 void __init hpte_init_pseries(void)
1705 {
1706 mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate;
1707 mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp;
1708 mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
1709 mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert;
1710 mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove;
1711 mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted;
1712 mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range;
1713 mmu_hash_ops.hpte_clear_all = pseries_hpte_clear_all;
1714 mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
1715
1716 if (firmware_has_feature(FW_FEATURE_HPT_RESIZE))
1717 mmu_hash_ops.resize_hpt = pseries_lpar_resize_hpt;
1718
1719 /*
1720 * On POWER9, we need to do a H_REGISTER_PROC_TBL hcall
1721 * to inform the hypervisor that we wish to use the HPT.
1722 */
1723 if (cpu_has_feature(CPU_FTR_ARCH_300))
1724 pseries_lpar_register_process_table(0, 0, 0);
1725 }
1726 #endif /* CONFIG_PPC_64S_HASH_MMU */
1727
1728 #ifdef CONFIG_PPC_RADIX_MMU
1729 void __init 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 * Keep track of hcall tracing depth and prevent recursion. Warn if any is
1831 * detected because it may indicate a problem. This will not catch all
1832 * problems with tracing code making hcalls, because the tracing might have
1833 * been invoked from a non-hcall, so the first hcall could recurse into it
1834 * without warning here, but this better than nothing.
1835 *
1836 * Hcalls with specific problems being traced should use the _notrace
1837 * plpar_hcall variants.
1838 */
1839 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
1840
1841
1842 notrace void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
1843 {
1844 unsigned long flags;
1845 unsigned int *depth;
1846
1847 local_irq_save(flags);
1848
1849 depth = this_cpu_ptr(&hcall_trace_depth);
1850
1851 if (WARN_ON_ONCE(*depth))
1852 goto out;
1853
1854 (*depth)++;
1855 preempt_disable();
1856 trace_hcall_entry(opcode, args);
1857 (*depth)--;
1858
1859 out:
1860 local_irq_restore(flags);
1861 }
1862
1863 notrace void __trace_hcall_exit(long opcode, long retval, unsigned long *retbuf)
1864 {
1865 unsigned long flags;
1866 unsigned int *depth;
1867
1868 local_irq_save(flags);
1869
1870 depth = this_cpu_ptr(&hcall_trace_depth);
1871
1872 if (*depth) /* Don't warn again on the way out */
1873 goto out;
1874
1875 (*depth)++;
1876 trace_hcall_exit(opcode, retval, retbuf);
1877 preempt_enable();
1878 (*depth)--;
1879
1880 out:
1881 local_irq_restore(flags);
1882 }
1883 #endif
1884
1885 /**
1886 * h_get_mpp
1887 * H_GET_MPP hcall returns info in 7 parms
1888 */
1889 long h_get_mpp(struct hvcall_mpp_data *mpp_data)
1890 {
1891 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
1892 long rc;
1893
1894 rc = plpar_hcall9(H_GET_MPP, retbuf);
1895
1896 mpp_data->entitled_mem = retbuf[0];
1897 mpp_data->mapped_mem = retbuf[1];
1898
1899 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
1900 mpp_data->pool_num = retbuf[2] & 0xffff;
1901
1902 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
1903 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
1904 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;
1905
1906 mpp_data->pool_size = retbuf[4];
1907 mpp_data->loan_request = retbuf[5];
1908 mpp_data->backing_mem = retbuf[6];
1909
1910 return rc;
1911 }
1912 EXPORT_SYMBOL(h_get_mpp);
1913
1914 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
1915 {
1916 int rc;
1917 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
1918
1919 rc = plpar_hcall9(H_GET_MPP_X, retbuf);
1920
1921 mpp_x_data->coalesced_bytes = retbuf[0];
1922 mpp_x_data->pool_coalesced_bytes = retbuf[1];
1923 mpp_x_data->pool_purr_cycles = retbuf[2];
1924 mpp_x_data->pool_spurr_cycles = retbuf[3];
1925
1926 return rc;
1927 }
1928
1929 #ifdef CONFIG_PPC_64S_HASH_MMU
1930 static unsigned long __init vsid_unscramble(unsigned long vsid, int ssize)
1931 {
1932 unsigned long protovsid;
1933 unsigned long va_bits = VA_BITS;
1934 unsigned long modinv, vsid_modulus;
1935 unsigned long max_mod_inv, tmp_modinv;
1936
1937 if (!mmu_has_feature(MMU_FTR_68_BIT_VA))
1938 va_bits = 65;
1939
1940 if (ssize == MMU_SEGSIZE_256M) {
1941 modinv = VSID_MULINV_256M;
1942 vsid_modulus = ((1UL << (va_bits - SID_SHIFT)) - 1);
1943 } else {
1944 modinv = VSID_MULINV_1T;
1945 vsid_modulus = ((1UL << (va_bits - SID_SHIFT_1T)) - 1);
1946 }
1947
1948 /*
1949 * vsid outside our range.
1950 */
1951 if (vsid >= vsid_modulus)
1952 return 0;
1953
1954 /*
1955 * If modinv is the modular multiplicate inverse of (x % vsid_modulus)
1956 * and vsid = (protovsid * x) % vsid_modulus, then we say:
1957 * protovsid = (vsid * modinv) % vsid_modulus
1958 */
1959
1960 /* Check if (vsid * modinv) overflow (63 bits) */
1961 max_mod_inv = 0x7fffffffffffffffull / vsid;
1962 if (modinv < max_mod_inv)
1963 return (vsid * modinv) % vsid_modulus;
1964
1965 tmp_modinv = modinv/max_mod_inv;
1966 modinv %= max_mod_inv;
1967
1968 protovsid = (((vsid * max_mod_inv) % vsid_modulus) * tmp_modinv) % vsid_modulus;
1969 protovsid = (protovsid + vsid * modinv) % vsid_modulus;
1970
1971 return protovsid;
1972 }
1973
1974 static int __init reserve_vrma_context_id(void)
1975 {
1976 unsigned long protovsid;
1977
1978 /*
1979 * Reserve context ids which map to reserved virtual addresses. For now
1980 * we only reserve the context id which maps to the VRMA VSID. We ignore
1981 * the addresses in "ibm,adjunct-virtual-addresses" because we don't
1982 * enable adjunct support via the "ibm,client-architecture-support"
1983 * interface.
1984 */
1985 protovsid = vsid_unscramble(VRMA_VSID, MMU_SEGSIZE_1T);
1986 hash__reserve_context_id(protovsid >> ESID_BITS_1T);
1987 return 0;
1988 }
1989 machine_device_initcall(pseries, reserve_vrma_context_id);
1990 #endif
1991
1992 #ifdef CONFIG_DEBUG_FS
1993 /* debugfs file interface for vpa data */
1994 static ssize_t vpa_file_read(struct file *filp, char __user *buf, size_t len,
1995 loff_t *pos)
1996 {
1997 int cpu = (long)filp->private_data;
1998 struct lppaca *lppaca = &lppaca_of(cpu);
1999
2000 return simple_read_from_buffer(buf, len, pos, lppaca,
2001 sizeof(struct lppaca));
2002 }
2003
2004 static const struct file_operations vpa_fops = {
2005 .open = simple_open,
2006 .read = vpa_file_read,
2007 .llseek = default_llseek,
2008 };
2009
2010 static int __init vpa_debugfs_init(void)
2011 {
2012 char name[16];
2013 long i;
2014 struct dentry *vpa_dir;
2015
2016 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
2017 return 0;
2018
2019 vpa_dir = debugfs_create_dir("vpa", arch_debugfs_dir);
2020
2021 /* set up the per-cpu vpa file*/
2022 for_each_possible_cpu(i) {
2023 sprintf(name, "cpu-%ld", i);
2024 debugfs_create_file(name, 0400, vpa_dir, (void *)i, &vpa_fops);
2025 }
2026
2027 return 0;
2028 }
2029 machine_arch_initcall(pseries, vpa_debugfs_init);
2030 #endif /* CONFIG_DEBUG_FS */
2031
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