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Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * pSeries_lpar.c | |
4 | * Copyright (C) 2001 Todd Inglett, IBM Corporation | |
5 | * | |
6 | * pSeries LPAR support. | |
1da177e4 LT |
7 | */ |
8 | ||
f7ebf352 ME |
9 | /* Enables debugging of low-level hash table routines - careful! */ |
10 | #undef DEBUG | |
65471d76 | 11 | #define pr_fmt(fmt) "lpar: " fmt |
1da177e4 | 12 | |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/dma-mapping.h> | |
463ce0e1 | 15 | #include <linux/console.h> |
66b15db6 | 16 | #include <linux/export.h> |
58995a9a | 17 | #include <linux/jump_label.h> |
dbcf929c DG |
18 | #include <linux/delay.h> |
19 | #include <linux/stop_machine.h> | |
d62c8dee NR |
20 | #include <linux/spinlock.h> |
21 | #include <linux/cpuhotplug.h> | |
22 | #include <linux/workqueue.h> | |
23 | #include <linux/proc_fs.h> | |
65fddcfc | 24 | #include <linux/pgtable.h> |
dbf77fed AK |
25 | #include <linux/debugfs.h> |
26 | ||
1da177e4 LT |
27 | #include <asm/processor.h> |
28 | #include <asm/mmu.h> | |
29 | #include <asm/page.h> | |
1da177e4 | 30 | #include <asm/machdep.h> |
1da177e4 | 31 | #include <asm/mmu_context.h> |
1da177e4 | 32 | #include <asm/iommu.h> |
1da177e4 LT |
33 | #include <asm/tlb.h> |
34 | #include <asm/prom.h> | |
1da177e4 | 35 | #include <asm/cputable.h> |
dcad47fc | 36 | #include <asm/udbg.h> |
2249ca9d | 37 | #include <asm/smp.h> |
c8cd093a | 38 | #include <asm/trace.h> |
f5339277 | 39 | #include <asm/firmware.h> |
212bebb4 | 40 | #include <asm/plpar_wrappers.h> |
c1caae3d | 41 | #include <asm/kexec.h> |
408cddd9 | 42 | #include <asm/fadump.h> |
42f5b4ca | 43 | #include <asm/asm-prototypes.h> |
d6bdceb6 | 44 | #include <asm/dtl.h> |
a1218720 | 45 | |
21cf9133 | 46 | #include "pseries.h" |
1da177e4 | 47 | |
1a527286 AK |
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 | ||
1da177e4 | 55 | |
b9377ffc | 56 | /* in hvCall.S */ |
1da177e4 | 57 | EXPORT_SYMBOL(plpar_hcall); |
b9377ffc | 58 | EXPORT_SYMBOL(plpar_hcall9); |
1da177e4 | 59 | EXPORT_SYMBOL(plpar_hcall_norets); |
b9377ffc | 60 | |
1211ee61 LD |
61 | /* |
62 | * H_BLOCK_REMOVE supported block size for this page size in segment who's base | |
63 | * page size is that page size. | |
64 | * | |
65 | * The first index is the segment base page size, the second one is the actual | |
66 | * page size. | |
67 | */ | |
68 | static int hblkrm_size[MMU_PAGE_COUNT][MMU_PAGE_COUNT] __ro_after_init; | |
69 | ||
59545ebe LD |
70 | /* |
71 | * Due to the involved complexity, and that the current hypervisor is only | |
72 | * returning this value or 0, we are limiting the support of the H_BLOCK_REMOVE | |
73 | * buffer size to 8 size block. | |
74 | */ | |
75 | #define HBLKRM_SUPPORTED_BLOCK_SIZE 8 | |
76 | ||
d62c8dee NR |
77 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
78 | static u8 dtl_mask = DTL_LOG_PREEMPT; | |
79 | #else | |
80 | static u8 dtl_mask; | |
81 | #endif | |
82 | ||
18a593c8 | 83 | void alloc_dtl_buffers(unsigned long *time_limit) |
1c85a2a1 NR |
84 | { |
85 | int cpu; | |
86 | struct paca_struct *pp; | |
87 | struct dtl_entry *dtl; | |
88 | ||
89 | for_each_possible_cpu(cpu) { | |
90 | pp = paca_ptrs[cpu]; | |
d62c8dee NR |
91 | if (pp->dispatch_log) |
92 | continue; | |
1c85a2a1 NR |
93 | dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL); |
94 | if (!dtl) { | |
95 | pr_warn("Failed to allocate dispatch trace log for cpu %d\n", | |
96 | cpu); | |
d62c8dee | 97 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
1c85a2a1 | 98 | pr_warn("Stolen time statistics will be unreliable\n"); |
d62c8dee | 99 | #endif |
1c85a2a1 NR |
100 | break; |
101 | } | |
102 | ||
103 | pp->dtl_ridx = 0; | |
104 | pp->dispatch_log = dtl; | |
105 | pp->dispatch_log_end = dtl + N_DISPATCH_LOG; | |
106 | pp->dtl_curr = dtl; | |
18a593c8 NR |
107 | |
108 | if (time_limit && time_after(jiffies, *time_limit)) { | |
109 | cond_resched(); | |
110 | *time_limit = jiffies + HZ; | |
111 | } | |
1c85a2a1 NR |
112 | } |
113 | } | |
114 | ||
115 | void register_dtl_buffer(int cpu) | |
116 | { | |
117 | long ret; | |
118 | struct paca_struct *pp; | |
119 | struct dtl_entry *dtl; | |
120 | int hwcpu = get_hard_smp_processor_id(cpu); | |
121 | ||
122 | pp = paca_ptrs[cpu]; | |
123 | dtl = pp->dispatch_log; | |
d62c8dee | 124 | if (dtl && dtl_mask) { |
1c85a2a1 NR |
125 | pp->dtl_ridx = 0; |
126 | pp->dtl_curr = dtl; | |
127 | lppaca_of(cpu).dtl_idx = 0; | |
128 | ||
129 | /* hypervisor reads buffer length from this field */ | |
130 | dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); | |
131 | ret = register_dtl(hwcpu, __pa(dtl)); | |
132 | if (ret) | |
133 | pr_err("WARNING: DTL registration of cpu %d (hw %d) failed with %ld\n", | |
134 | cpu, hwcpu, ret); | |
135 | ||
d62c8dee | 136 | lppaca_of(cpu).dtl_enable_mask = dtl_mask; |
1c85a2a1 NR |
137 | } |
138 | } | |
139 | ||
06220d78 | 140 | #ifdef CONFIG_PPC_SPLPAR |
d62c8dee NR |
141 | struct dtl_worker { |
142 | struct delayed_work work; | |
143 | int cpu; | |
144 | }; | |
145 | ||
146 | struct vcpu_dispatch_data { | |
147 | int last_disp_cpu; | |
148 | ||
149 | int total_disp; | |
150 | ||
151 | int same_cpu_disp; | |
152 | int same_chip_disp; | |
153 | int diff_chip_disp; | |
154 | int far_chip_disp; | |
155 | ||
156 | int numa_home_disp; | |
157 | int numa_remote_disp; | |
158 | int numa_far_disp; | |
159 | }; | |
160 | ||
161 | /* | |
162 | * This represents the number of cpus in the hypervisor. Since there is no | |
163 | * architected way to discover the number of processors in the host, we | |
164 | * provision for dealing with NR_CPUS. This is currently 2048 by default, and | |
165 | * is sufficient for our purposes. This will need to be tweaked if | |
166 | * CONFIG_NR_CPUS is changed. | |
167 | */ | |
168 | #define NR_CPUS_H NR_CPUS | |
169 | ||
06220d78 | 170 | DEFINE_RWLOCK(dtl_access_lock); |
d62c8dee NR |
171 | static DEFINE_PER_CPU(struct vcpu_dispatch_data, vcpu_disp_data); |
172 | static DEFINE_PER_CPU(u64, dtl_entry_ridx); | |
173 | static DEFINE_PER_CPU(struct dtl_worker, dtl_workers); | |
174 | static enum cpuhp_state dtl_worker_state; | |
175 | static DEFINE_MUTEX(dtl_enable_mutex); | |
176 | static int vcpudispatch_stats_on __read_mostly; | |
177 | static int vcpudispatch_stats_freq = 50; | |
178 | static __be32 *vcpu_associativity, *pcpu_associativity; | |
179 | ||
180 | ||
18a593c8 | 181 | static void free_dtl_buffers(unsigned long *time_limit) |
d62c8dee NR |
182 | { |
183 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
184 | int cpu; | |
185 | struct paca_struct *pp; | |
186 | ||
187 | for_each_possible_cpu(cpu) { | |
188 | pp = paca_ptrs[cpu]; | |
189 | if (!pp->dispatch_log) | |
190 | continue; | |
191 | kmem_cache_free(dtl_cache, pp->dispatch_log); | |
192 | pp->dtl_ridx = 0; | |
193 | pp->dispatch_log = 0; | |
194 | pp->dispatch_log_end = 0; | |
195 | pp->dtl_curr = 0; | |
18a593c8 NR |
196 | |
197 | if (time_limit && time_after(jiffies, *time_limit)) { | |
198 | cond_resched(); | |
199 | *time_limit = jiffies + HZ; | |
200 | } | |
d62c8dee NR |
201 | } |
202 | #endif | |
203 | } | |
204 | ||
205 | static int init_cpu_associativity(void) | |
206 | { | |
207 | vcpu_associativity = kcalloc(num_possible_cpus() / threads_per_core, | |
208 | VPHN_ASSOC_BUFSIZE * sizeof(__be32), GFP_KERNEL); | |
209 | pcpu_associativity = kcalloc(NR_CPUS_H / threads_per_core, | |
210 | VPHN_ASSOC_BUFSIZE * sizeof(__be32), GFP_KERNEL); | |
211 | ||
212 | if (!vcpu_associativity || !pcpu_associativity) { | |
213 | pr_err("error allocating memory for associativity information\n"); | |
214 | return -ENOMEM; | |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static void destroy_cpu_associativity(void) | |
221 | { | |
222 | kfree(vcpu_associativity); | |
223 | kfree(pcpu_associativity); | |
224 | vcpu_associativity = pcpu_associativity = 0; | |
225 | } | |
226 | ||
227 | static __be32 *__get_cpu_associativity(int cpu, __be32 *cpu_assoc, int flag) | |
228 | { | |
229 | __be32 *assoc; | |
230 | int rc = 0; | |
231 | ||
232 | assoc = &cpu_assoc[(int)(cpu / threads_per_core) * VPHN_ASSOC_BUFSIZE]; | |
233 | if (!assoc[0]) { | |
234 | rc = hcall_vphn(cpu, flag, &assoc[0]); | |
235 | if (rc) | |
236 | return NULL; | |
237 | } | |
238 | ||
239 | return assoc; | |
240 | } | |
241 | ||
242 | static __be32 *get_pcpu_associativity(int cpu) | |
243 | { | |
244 | return __get_cpu_associativity(cpu, pcpu_associativity, VPHN_FLAG_PCPU); | |
245 | } | |
246 | ||
247 | static __be32 *get_vcpu_associativity(int cpu) | |
248 | { | |
249 | return __get_cpu_associativity(cpu, vcpu_associativity, VPHN_FLAG_VCPU); | |
250 | } | |
251 | ||
252 | static int cpu_relative_dispatch_distance(int last_disp_cpu, int cur_disp_cpu) | |
253 | { | |
254 | __be32 *last_disp_cpu_assoc, *cur_disp_cpu_assoc; | |
255 | ||
256 | if (last_disp_cpu >= NR_CPUS_H || cur_disp_cpu >= NR_CPUS_H) | |
257 | return -EINVAL; | |
258 | ||
259 | last_disp_cpu_assoc = get_pcpu_associativity(last_disp_cpu); | |
260 | cur_disp_cpu_assoc = get_pcpu_associativity(cur_disp_cpu); | |
261 | ||
262 | if (!last_disp_cpu_assoc || !cur_disp_cpu_assoc) | |
263 | return -EIO; | |
264 | ||
ef31cb83 | 265 | return cpu_relative_distance(last_disp_cpu_assoc, cur_disp_cpu_assoc); |
d62c8dee NR |
266 | } |
267 | ||
268 | static int cpu_home_node_dispatch_distance(int disp_cpu) | |
269 | { | |
270 | __be32 *disp_cpu_assoc, *vcpu_assoc; | |
271 | int vcpu_id = smp_processor_id(); | |
272 | ||
273 | if (disp_cpu >= NR_CPUS_H) { | |
274 | pr_debug_ratelimited("vcpu dispatch cpu %d > %d\n", | |
275 | disp_cpu, NR_CPUS_H); | |
276 | return -EINVAL; | |
277 | } | |
278 | ||
279 | disp_cpu_assoc = get_pcpu_associativity(disp_cpu); | |
280 | vcpu_assoc = get_vcpu_associativity(vcpu_id); | |
281 | ||
282 | if (!disp_cpu_assoc || !vcpu_assoc) | |
283 | return -EIO; | |
284 | ||
ef31cb83 | 285 | return cpu_relative_distance(disp_cpu_assoc, vcpu_assoc); |
d62c8dee NR |
286 | } |
287 | ||
288 | static void update_vcpu_disp_stat(int disp_cpu) | |
289 | { | |
290 | struct vcpu_dispatch_data *disp; | |
291 | int distance; | |
292 | ||
293 | disp = this_cpu_ptr(&vcpu_disp_data); | |
294 | if (disp->last_disp_cpu == -1) { | |
295 | disp->last_disp_cpu = disp_cpu; | |
296 | return; | |
297 | } | |
298 | ||
299 | disp->total_disp++; | |
300 | ||
301 | if (disp->last_disp_cpu == disp_cpu || | |
302 | (cpu_first_thread_sibling(disp->last_disp_cpu) == | |
303 | cpu_first_thread_sibling(disp_cpu))) | |
304 | disp->same_cpu_disp++; | |
305 | else { | |
306 | distance = cpu_relative_dispatch_distance(disp->last_disp_cpu, | |
307 | disp_cpu); | |
308 | if (distance < 0) | |
309 | pr_debug_ratelimited("vcpudispatch_stats: cpu %d: error determining associativity\n", | |
310 | smp_processor_id()); | |
311 | else { | |
312 | switch (distance) { | |
313 | case 0: | |
314 | disp->same_chip_disp++; | |
315 | break; | |
316 | case 1: | |
317 | disp->diff_chip_disp++; | |
318 | break; | |
319 | case 2: | |
320 | disp->far_chip_disp++; | |
321 | break; | |
322 | default: | |
323 | pr_debug_ratelimited("vcpudispatch_stats: cpu %d (%d -> %d): unexpected relative dispatch distance %d\n", | |
324 | smp_processor_id(), | |
325 | disp->last_disp_cpu, | |
326 | disp_cpu, | |
327 | distance); | |
328 | } | |
329 | } | |
330 | } | |
331 | ||
332 | distance = cpu_home_node_dispatch_distance(disp_cpu); | |
333 | if (distance < 0) | |
334 | pr_debug_ratelimited("vcpudispatch_stats: cpu %d: error determining associativity\n", | |
335 | smp_processor_id()); | |
336 | else { | |
337 | switch (distance) { | |
338 | case 0: | |
339 | disp->numa_home_disp++; | |
340 | break; | |
341 | case 1: | |
342 | disp->numa_remote_disp++; | |
343 | break; | |
344 | case 2: | |
345 | disp->numa_far_disp++; | |
346 | break; | |
347 | default: | |
348 | pr_debug_ratelimited("vcpudispatch_stats: cpu %d on %d: unexpected numa dispatch distance %d\n", | |
349 | smp_processor_id(), | |
350 | disp_cpu, | |
351 | distance); | |
352 | } | |
353 | } | |
354 | ||
355 | disp->last_disp_cpu = disp_cpu; | |
356 | } | |
357 | ||
358 | static void process_dtl_buffer(struct work_struct *work) | |
359 | { | |
360 | struct dtl_entry dtle; | |
361 | u64 i = __this_cpu_read(dtl_entry_ridx); | |
362 | struct dtl_entry *dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG); | |
363 | struct dtl_entry *dtl_end = local_paca->dispatch_log_end; | |
364 | struct lppaca *vpa = local_paca->lppaca_ptr; | |
365 | struct dtl_worker *d = container_of(work, struct dtl_worker, work.work); | |
366 | ||
367 | if (!local_paca->dispatch_log) | |
368 | return; | |
369 | ||
370 | /* if we have been migrated away, we cancel ourself */ | |
371 | if (d->cpu != smp_processor_id()) { | |
372 | pr_debug("vcpudispatch_stats: cpu %d worker migrated -- canceling worker\n", | |
373 | smp_processor_id()); | |
374 | return; | |
375 | } | |
376 | ||
377 | if (i == be64_to_cpu(vpa->dtl_idx)) | |
378 | goto out; | |
379 | ||
380 | while (i < be64_to_cpu(vpa->dtl_idx)) { | |
381 | dtle = *dtl; | |
382 | barrier(); | |
383 | if (i + N_DISPATCH_LOG < be64_to_cpu(vpa->dtl_idx)) { | |
384 | /* buffer has overflowed */ | |
385 | pr_debug_ratelimited("vcpudispatch_stats: cpu %d lost %lld DTL samples\n", | |
386 | d->cpu, | |
387 | be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG - i); | |
388 | i = be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG; | |
389 | dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG); | |
390 | continue; | |
391 | } | |
392 | update_vcpu_disp_stat(be16_to_cpu(dtle.processor_id)); | |
393 | ++i; | |
394 | ++dtl; | |
395 | if (dtl == dtl_end) | |
396 | dtl = local_paca->dispatch_log; | |
397 | } | |
398 | ||
399 | __this_cpu_write(dtl_entry_ridx, i); | |
400 | ||
401 | out: | |
402 | schedule_delayed_work_on(d->cpu, to_delayed_work(work), | |
403 | HZ / vcpudispatch_stats_freq); | |
404 | } | |
405 | ||
406 | static int dtl_worker_online(unsigned int cpu) | |
407 | { | |
408 | struct dtl_worker *d = &per_cpu(dtl_workers, cpu); | |
409 | ||
410 | memset(d, 0, sizeof(*d)); | |
411 | INIT_DELAYED_WORK(&d->work, process_dtl_buffer); | |
412 | d->cpu = cpu; | |
413 | ||
414 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
415 | per_cpu(dtl_entry_ridx, cpu) = 0; | |
416 | register_dtl_buffer(cpu); | |
417 | #else | |
418 | per_cpu(dtl_entry_ridx, cpu) = be64_to_cpu(lppaca_of(cpu).dtl_idx); | |
419 | #endif | |
420 | ||
421 | schedule_delayed_work_on(cpu, &d->work, HZ / vcpudispatch_stats_freq); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | static int dtl_worker_offline(unsigned int cpu) | |
426 | { | |
427 | struct dtl_worker *d = &per_cpu(dtl_workers, cpu); | |
428 | ||
429 | cancel_delayed_work_sync(&d->work); | |
430 | ||
431 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
432 | unregister_dtl(get_hard_smp_processor_id(cpu)); | |
433 | #endif | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | static void set_global_dtl_mask(u8 mask) | |
439 | { | |
440 | int cpu; | |
441 | ||
442 | dtl_mask = mask; | |
443 | for_each_present_cpu(cpu) | |
444 | lppaca_of(cpu).dtl_enable_mask = dtl_mask; | |
445 | } | |
446 | ||
447 | static void reset_global_dtl_mask(void) | |
448 | { | |
449 | int cpu; | |
450 | ||
451 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
452 | dtl_mask = DTL_LOG_PREEMPT; | |
453 | #else | |
454 | dtl_mask = 0; | |
455 | #endif | |
456 | for_each_present_cpu(cpu) | |
457 | lppaca_of(cpu).dtl_enable_mask = dtl_mask; | |
458 | } | |
459 | ||
18a593c8 | 460 | static int dtl_worker_enable(unsigned long *time_limit) |
d62c8dee NR |
461 | { |
462 | int rc = 0, state; | |
463 | ||
464 | if (!write_trylock(&dtl_access_lock)) { | |
465 | rc = -EBUSY; | |
466 | goto out; | |
467 | } | |
468 | ||
469 | set_global_dtl_mask(DTL_LOG_ALL); | |
470 | ||
471 | /* Setup dtl buffers and register those */ | |
18a593c8 | 472 | alloc_dtl_buffers(time_limit); |
d62c8dee NR |
473 | |
474 | state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powerpc/dtl:online", | |
475 | dtl_worker_online, dtl_worker_offline); | |
476 | if (state < 0) { | |
477 | pr_err("vcpudispatch_stats: unable to setup workqueue for DTL processing\n"); | |
18a593c8 | 478 | free_dtl_buffers(time_limit); |
d62c8dee NR |
479 | reset_global_dtl_mask(); |
480 | write_unlock(&dtl_access_lock); | |
481 | rc = -EINVAL; | |
482 | goto out; | |
483 | } | |
484 | dtl_worker_state = state; | |
485 | ||
486 | out: | |
487 | return rc; | |
488 | } | |
489 | ||
18a593c8 | 490 | static void dtl_worker_disable(unsigned long *time_limit) |
d62c8dee NR |
491 | { |
492 | cpuhp_remove_state(dtl_worker_state); | |
18a593c8 | 493 | free_dtl_buffers(time_limit); |
d62c8dee NR |
494 | reset_global_dtl_mask(); |
495 | write_unlock(&dtl_access_lock); | |
496 | } | |
497 | ||
498 | static ssize_t vcpudispatch_stats_write(struct file *file, const char __user *p, | |
499 | size_t count, loff_t *ppos) | |
500 | { | |
18a593c8 | 501 | unsigned long time_limit = jiffies + HZ; |
d62c8dee NR |
502 | struct vcpu_dispatch_data *disp; |
503 | int rc, cmd, cpu; | |
504 | char buf[16]; | |
505 | ||
506 | if (count > 15) | |
507 | return -EINVAL; | |
508 | ||
509 | if (copy_from_user(buf, p, count)) | |
510 | return -EFAULT; | |
511 | ||
512 | buf[count] = 0; | |
513 | rc = kstrtoint(buf, 0, &cmd); | |
514 | if (rc || cmd < 0 || cmd > 1) { | |
515 | pr_err("vcpudispatch_stats: please use 0 to disable or 1 to enable dispatch statistics\n"); | |
516 | return rc ? rc : -EINVAL; | |
517 | } | |
518 | ||
519 | mutex_lock(&dtl_enable_mutex); | |
520 | ||
521 | if ((cmd == 0 && !vcpudispatch_stats_on) || | |
522 | (cmd == 1 && vcpudispatch_stats_on)) | |
523 | goto out; | |
524 | ||
525 | if (cmd) { | |
526 | rc = init_cpu_associativity(); | |
527 | if (rc) | |
528 | goto out; | |
529 | ||
530 | for_each_possible_cpu(cpu) { | |
531 | disp = per_cpu_ptr(&vcpu_disp_data, cpu); | |
532 | memset(disp, 0, sizeof(*disp)); | |
533 | disp->last_disp_cpu = -1; | |
534 | } | |
535 | ||
18a593c8 | 536 | rc = dtl_worker_enable(&time_limit); |
d62c8dee NR |
537 | if (rc) { |
538 | destroy_cpu_associativity(); | |
539 | goto out; | |
540 | } | |
541 | } else { | |
18a593c8 | 542 | dtl_worker_disable(&time_limit); |
d62c8dee NR |
543 | destroy_cpu_associativity(); |
544 | } | |
545 | ||
546 | vcpudispatch_stats_on = cmd; | |
547 | ||
548 | out: | |
549 | mutex_unlock(&dtl_enable_mutex); | |
550 | if (rc) | |
551 | return rc; | |
552 | return count; | |
553 | } | |
554 | ||
555 | static int vcpudispatch_stats_display(struct seq_file *p, void *v) | |
556 | { | |
557 | int cpu; | |
558 | struct vcpu_dispatch_data *disp; | |
559 | ||
560 | if (!vcpudispatch_stats_on) { | |
561 | seq_puts(p, "off\n"); | |
562 | return 0; | |
563 | } | |
564 | ||
565 | for_each_online_cpu(cpu) { | |
566 | disp = per_cpu_ptr(&vcpu_disp_data, cpu); | |
567 | seq_printf(p, "cpu%d", cpu); | |
568 | seq_put_decimal_ull(p, " ", disp->total_disp); | |
569 | seq_put_decimal_ull(p, " ", disp->same_cpu_disp); | |
570 | seq_put_decimal_ull(p, " ", disp->same_chip_disp); | |
571 | seq_put_decimal_ull(p, " ", disp->diff_chip_disp); | |
572 | seq_put_decimal_ull(p, " ", disp->far_chip_disp); | |
573 | seq_put_decimal_ull(p, " ", disp->numa_home_disp); | |
574 | seq_put_decimal_ull(p, " ", disp->numa_remote_disp); | |
575 | seq_put_decimal_ull(p, " ", disp->numa_far_disp); | |
576 | seq_puts(p, "\n"); | |
577 | } | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | static int vcpudispatch_stats_open(struct inode *inode, struct file *file) | |
583 | { | |
584 | return single_open(file, vcpudispatch_stats_display, NULL); | |
585 | } | |
586 | ||
97a32539 AD |
587 | static const struct proc_ops vcpudispatch_stats_proc_ops = { |
588 | .proc_open = vcpudispatch_stats_open, | |
589 | .proc_read = seq_read, | |
590 | .proc_write = vcpudispatch_stats_write, | |
591 | .proc_lseek = seq_lseek, | |
592 | .proc_release = single_release, | |
d62c8dee NR |
593 | }; |
594 | ||
595 | static ssize_t vcpudispatch_stats_freq_write(struct file *file, | |
596 | const char __user *p, size_t count, loff_t *ppos) | |
597 | { | |
598 | int rc, freq; | |
599 | char buf[16]; | |
600 | ||
601 | if (count > 15) | |
602 | return -EINVAL; | |
603 | ||
604 | if (copy_from_user(buf, p, count)) | |
605 | return -EFAULT; | |
606 | ||
607 | buf[count] = 0; | |
608 | rc = kstrtoint(buf, 0, &freq); | |
609 | if (rc || freq < 1 || freq > HZ) { | |
610 | pr_err("vcpudispatch_stats_freq: please specify a frequency between 1 and %d\n", | |
611 | HZ); | |
612 | return rc ? rc : -EINVAL; | |
613 | } | |
614 | ||
615 | vcpudispatch_stats_freq = freq; | |
616 | ||
617 | return count; | |
618 | } | |
619 | ||
620 | static int vcpudispatch_stats_freq_display(struct seq_file *p, void *v) | |
621 | { | |
622 | seq_printf(p, "%d\n", vcpudispatch_stats_freq); | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static int vcpudispatch_stats_freq_open(struct inode *inode, struct file *file) | |
627 | { | |
628 | return single_open(file, vcpudispatch_stats_freq_display, NULL); | |
629 | } | |
630 | ||
97a32539 AD |
631 | static const struct proc_ops vcpudispatch_stats_freq_proc_ops = { |
632 | .proc_open = vcpudispatch_stats_freq_open, | |
633 | .proc_read = seq_read, | |
634 | .proc_write = vcpudispatch_stats_freq_write, | |
635 | .proc_lseek = seq_lseek, | |
636 | .proc_release = single_release, | |
d62c8dee NR |
637 | }; |
638 | ||
639 | static int __init vcpudispatch_stats_procfs_init(void) | |
640 | { | |
adde8715 NP |
641 | /* |
642 | * Avoid smp_processor_id while preemptible. All CPUs should have | |
643 | * the same value for lppaca_shared_proc. | |
644 | */ | |
645 | preempt_disable(); | |
646 | if (!lppaca_shared_proc(get_lppaca())) { | |
647 | preempt_enable(); | |
d62c8dee | 648 | return 0; |
adde8715 NP |
649 | } |
650 | preempt_enable(); | |
d62c8dee NR |
651 | |
652 | if (!proc_create("powerpc/vcpudispatch_stats", 0600, NULL, | |
653 | &vcpudispatch_stats_proc_ops)) | |
654 | pr_err("vcpudispatch_stats: error creating procfs file\n"); | |
655 | else if (!proc_create("powerpc/vcpudispatch_stats_freq", 0600, NULL, | |
656 | &vcpudispatch_stats_freq_proc_ops)) | |
657 | pr_err("vcpudispatch_stats_freq: error creating procfs file\n"); | |
658 | ||
659 | return 0; | |
660 | } | |
661 | ||
662 | machine_device_initcall(pseries, vcpudispatch_stats_procfs_init); | |
06220d78 NR |
663 | #endif /* CONFIG_PPC_SPLPAR */ |
664 | ||
1da177e4 LT |
665 | void vpa_init(int cpu) |
666 | { | |
667 | int hwcpu = get_hard_smp_processor_id(cpu); | |
2f6093c8 | 668 | unsigned long addr; |
1da177e4 | 669 | long ret; |
233ccd0d | 670 | |
b89bdfb8 ME |
671 | /* |
672 | * The spec says it "may be problematic" if CPU x registers the VPA of | |
673 | * CPU y. We should never do that, but wail if we ever do. | |
674 | */ | |
675 | WARN_ON(cpu != smp_processor_id()); | |
676 | ||
233ccd0d | 677 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
8154c5d2 | 678 | lppaca_of(cpu).vmxregs_in_use = 1; |
233ccd0d | 679 | |
6e0b8bc9 ME |
680 | if (cpu_has_feature(CPU_FTR_ARCH_207S)) |
681 | lppaca_of(cpu).ebb_regs_in_use = 1; | |
682 | ||
8154c5d2 | 683 | addr = __pa(&lppaca_of(cpu)); |
2f6093c8 | 684 | ret = register_vpa(hwcpu, addr); |
1da177e4 | 685 | |
2f6093c8 | 686 | if (ret) { |
711ef84e AB |
687 | pr_err("WARNING: VPA registration for cpu %d (hw %d) of area " |
688 | "%lx failed with %ld\n", cpu, hwcpu, addr, ret); | |
2f6093c8 MN |
689 | return; |
690 | } | |
d8c476ee | 691 | |
4e003747 | 692 | #ifdef CONFIG_PPC_BOOK3S_64 |
2f6093c8 MN |
693 | /* |
694 | * PAPR says this feature is SLB-Buffer but firmware never | |
695 | * reports that. All SPLPAR support SLB shadow buffer. | |
696 | */ | |
d8c476ee | 697 | if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) { |
d2e60075 | 698 | addr = __pa(paca_ptrs[cpu]->slb_shadow_ptr); |
2f6093c8 MN |
699 | ret = register_slb_shadow(hwcpu, addr); |
700 | if (ret) | |
711ef84e AB |
701 | pr_err("WARNING: SLB shadow buffer registration for " |
702 | "cpu %d (hw %d) of area %lx failed with %ld\n", | |
703 | cpu, hwcpu, addr, ret); | |
2f6093c8 | 704 | } |
4e003747 | 705 | #endif /* CONFIG_PPC_BOOK3S_64 */ |
cf9efce0 PM |
706 | |
707 | /* | |
708 | * Register dispatch trace log, if one has been allocated. | |
709 | */ | |
1c85a2a1 | 710 | register_dtl_buffer(cpu); |
1da177e4 LT |
711 | } |
712 | ||
4e003747 | 713 | #ifdef CONFIG_PPC_BOOK3S_64 |
d8c476ee | 714 | |
035223fb | 715 | static long pSeries_lpar_hpte_insert(unsigned long hpte_group, |
5524a27d AK |
716 | unsigned long vpn, unsigned long pa, |
717 | unsigned long rflags, unsigned long vflags, | |
b1022fbd | 718 | int psize, int apsize, int ssize) |
1da177e4 | 719 | { |
1da177e4 LT |
720 | unsigned long lpar_rc; |
721 | unsigned long flags; | |
722 | unsigned long slot; | |
96e28449 | 723 | unsigned long hpte_v, hpte_r; |
1da177e4 | 724 | |
3c726f8d | 725 | if (!(vflags & HPTE_V_BOLTED)) |
5524a27d AK |
726 | pr_devel("hpte_insert(group=%lx, vpn=%016lx, " |
727 | "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n", | |
728 | hpte_group, vpn, pa, rflags, vflags, psize); | |
3c726f8d | 729 | |
b1022fbd | 730 | hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID; |
6b243fcf | 731 | hpte_r = hpte_encode_r(pa, psize, apsize) | rflags; |
3c726f8d BH |
732 | |
733 | if (!(vflags & HPTE_V_BOLTED)) | |
551a232c | 734 | pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); |
3c726f8d | 735 | |
1da177e4 LT |
736 | /* Now fill in the actual HPTE */ |
737 | /* Set CEC cookie to 0 */ | |
738 | /* Zero page = 0 */ | |
739 | /* I-cache Invalidate = 0 */ | |
740 | /* I-cache synchronize = 0 */ | |
741 | /* Exact = 0 */ | |
742 | flags = 0; | |
743 | ||
9ee820fa BK |
744 | if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N)) |
745 | flags |= H_COALESCE_CAND; | |
1da177e4 | 746 | |
b9377ffc | 747 | lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); |
706c8c93 | 748 | if (unlikely(lpar_rc == H_PTEG_FULL)) { |
ca42d8d2 | 749 | pr_devel("Hash table group is full\n"); |
1da177e4 | 750 | return -1; |
3c726f8d | 751 | } |
1da177e4 LT |
752 | |
753 | /* | |
754 | * Since we try and ioremap PHBs we don't own, the pte insert | |
755 | * will fail. However we must catch the failure in hash_page | |
756 | * or we will loop forever, so return -2 in this case. | |
757 | */ | |
706c8c93 | 758 | if (unlikely(lpar_rc != H_SUCCESS)) { |
ca42d8d2 | 759 | pr_err("Failed hash pte insert with error %ld\n", lpar_rc); |
1da177e4 | 760 | return -2; |
3c726f8d BH |
761 | } |
762 | if (!(vflags & HPTE_V_BOLTED)) | |
551a232c | 763 | pr_devel(" -> slot: %lu\n", slot & 7); |
1da177e4 LT |
764 | |
765 | /* Because of iSeries, we have to pass down the secondary | |
766 | * bucket bit here as well | |
767 | */ | |
96e28449 | 768 | return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); |
1da177e4 LT |
769 | } |
770 | ||
771 | static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); | |
772 | ||
773 | static long pSeries_lpar_hpte_remove(unsigned long hpte_group) | |
774 | { | |
775 | unsigned long slot_offset; | |
776 | unsigned long lpar_rc; | |
777 | int i; | |
778 | unsigned long dummy1, dummy2; | |
779 | ||
780 | /* pick a random slot to start at */ | |
781 | slot_offset = mftb() & 0x7; | |
782 | ||
783 | for (i = 0; i < HPTES_PER_GROUP; i++) { | |
784 | ||
785 | /* don't remove a bolted entry */ | |
786 | lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, | |
82ce028a | 787 | HPTE_V_BOLTED, &dummy1, &dummy2); |
706c8c93 | 788 | if (lpar_rc == H_SUCCESS) |
1da177e4 | 789 | return i; |
9fb26401 MW |
790 | |
791 | /* | |
792 | * The test for adjunct partition is performed before the | |
793 | * ANDCOND test. H_RESOURCE may be returned, so we need to | |
794 | * check for that as well. | |
795 | */ | |
796 | BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE); | |
1da177e4 LT |
797 | |
798 | slot_offset++; | |
799 | slot_offset &= 0x7; | |
800 | } | |
801 | ||
802 | return -1; | |
803 | } | |
804 | ||
8119cefd HB |
805 | /* Called during kexec sequence with MMU off */ |
806 | static notrace void manual_hpte_clear_all(void) | |
1da177e4 LT |
807 | { |
808 | unsigned long size_bytes = 1UL << ppc64_pft_size; | |
809 | unsigned long hpte_count = size_bytes >> 4; | |
d504bed6 MN |
810 | struct { |
811 | unsigned long pteh; | |
812 | unsigned long ptel; | |
813 | } ptes[4]; | |
b7abc5c5 | 814 | long lpar_rc; |
bed9a315 | 815 | unsigned long i, j; |
d504bed6 MN |
816 | |
817 | /* Read in batches of 4, | |
818 | * invalidate only valid entries not in the VRMA | |
819 | * hpte_count will be a multiple of 4 | |
820 | */ | |
821 | for (i = 0; i < hpte_count; i += 4) { | |
822 | lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); | |
ca42d8d2 AK |
823 | if (lpar_rc != H_SUCCESS) { |
824 | pr_info("Failed to read hash page table at %ld err %ld\n", | |
825 | i, lpar_rc); | |
d504bed6 | 826 | continue; |
ca42d8d2 | 827 | } |
d504bed6 MN |
828 | for (j = 0; j < 4; j++){ |
829 | if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == | |
830 | HPTE_V_VRMA_MASK) | |
831 | continue; | |
832 | if (ptes[j].pteh & HPTE_V_VALID) | |
833 | plpar_pte_remove_raw(0, i + j, 0, | |
834 | &(ptes[j].pteh), &(ptes[j].ptel)); | |
b7abc5c5 SS |
835 | } |
836 | } | |
5246adec AB |
837 | } |
838 | ||
8119cefd HB |
839 | /* Called during kexec sequence with MMU off */ |
840 | static notrace int hcall_hpte_clear_all(void) | |
5246adec AB |
841 | { |
842 | int rc; | |
843 | ||
844 | do { | |
845 | rc = plpar_hcall_norets(H_CLEAR_HPT); | |
846 | } while (rc == H_CONTINUE); | |
847 | ||
848 | return rc; | |
849 | } | |
850 | ||
8119cefd HB |
851 | /* Called during kexec sequence with MMU off */ |
852 | static notrace void pseries_hpte_clear_all(void) | |
5246adec AB |
853 | { |
854 | int rc; | |
855 | ||
856 | rc = hcall_hpte_clear_all(); | |
857 | if (rc != H_SUCCESS) | |
858 | manual_hpte_clear_all(); | |
e844b1ee AB |
859 | |
860 | #ifdef __LITTLE_ENDIAN__ | |
408cddd9 HB |
861 | /* |
862 | * Reset exceptions to big endian. | |
863 | * | |
864 | * FIXME this is a hack for kexec, we need to reset the exception | |
865 | * endian before starting the new kernel and this is a convenient place | |
866 | * to do it. | |
867 | * | |
868 | * This is also called on boot when a fadump happens. In that case we | |
869 | * must not change the exception endian mode. | |
870 | */ | |
d3cbff1b BH |
871 | if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) |
872 | pseries_big_endian_exceptions(); | |
e844b1ee | 873 | #endif |
1da177e4 LT |
874 | } |
875 | ||
876 | /* | |
877 | * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and | |
878 | * the low 3 bits of flags happen to line up. So no transform is needed. | |
879 | * We can probably optimize here and assume the high bits of newpp are | |
880 | * already zero. For now I am paranoid. | |
881 | */ | |
3c726f8d BH |
882 | static long pSeries_lpar_hpte_updatepp(unsigned long slot, |
883 | unsigned long newpp, | |
5524a27d | 884 | unsigned long vpn, |
db3d8534 | 885 | int psize, int apsize, |
aefa5688 | 886 | int ssize, unsigned long inv_flags) |
1da177e4 LT |
887 | { |
888 | unsigned long lpar_rc; | |
e71ff982 | 889 | unsigned long flags; |
3c726f8d | 890 | unsigned long want_v; |
1da177e4 | 891 | |
5524a27d | 892 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
1da177e4 | 893 | |
53f1d317 AK |
894 | flags = (newpp & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO)) | H_AVPN; |
895 | flags |= (newpp & HPTE_R_KEY_HI) >> 48; | |
e71ff982 BS |
896 | if (mmu_has_feature(MMU_FTR_KERNEL_RO)) |
897 | /* Move pp0 into bit 8 (IBM 55) */ | |
898 | flags |= (newpp & HPTE_R_PP0) >> 55; | |
899 | ||
a8c0bf3c AK |
900 | pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", |
901 | want_v, slot, flags, psize); | |
902 | ||
1189be65 | 903 | lpar_rc = plpar_pte_protect(flags, slot, want_v); |
3c726f8d | 904 | |
706c8c93 | 905 | if (lpar_rc == H_NOT_FOUND) { |
551a232c | 906 | pr_devel("not found !\n"); |
1da177e4 | 907 | return -1; |
3c726f8d BH |
908 | } |
909 | ||
551a232c | 910 | pr_devel("ok\n"); |
1da177e4 | 911 | |
706c8c93 | 912 | BUG_ON(lpar_rc != H_SUCCESS); |
1da177e4 LT |
913 | |
914 | return 0; | |
915 | } | |
916 | ||
4ad90c86 | 917 | static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group) |
1da177e4 | 918 | { |
4ad90c86 AK |
919 | long lpar_rc; |
920 | unsigned long i, j; | |
921 | struct { | |
922 | unsigned long pteh; | |
923 | unsigned long ptel; | |
924 | } ptes[4]; | |
1da177e4 | 925 | |
4ad90c86 | 926 | for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) { |
1da177e4 | 927 | |
4ad90c86 | 928 | lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes); |
ca42d8d2 AK |
929 | if (lpar_rc != H_SUCCESS) { |
930 | pr_info("Failed to read hash page table at %ld err %ld\n", | |
931 | hpte_group, lpar_rc); | |
4ad90c86 | 932 | continue; |
ca42d8d2 | 933 | } |
1da177e4 | 934 | |
4ad90c86 AK |
935 | for (j = 0; j < 4; j++) { |
936 | if (HPTE_V_COMPARE(ptes[j].pteh, want_v) && | |
937 | (ptes[j].pteh & HPTE_V_VALID)) | |
938 | return i + j; | |
939 | } | |
940 | } | |
1da177e4 | 941 | |
4ad90c86 | 942 | return -1; |
1da177e4 LT |
943 | } |
944 | ||
5524a27d | 945 | static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) |
1da177e4 | 946 | { |
1da177e4 | 947 | long slot; |
4ad90c86 AK |
948 | unsigned long hash; |
949 | unsigned long want_v; | |
950 | unsigned long hpte_group; | |
1da177e4 | 951 | |
5524a27d AK |
952 | hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); |
953 | want_v = hpte_encode_avpn(vpn, psize, ssize); | |
1189be65 | 954 | |
d78d5dac AK |
955 | /* |
956 | * We try to keep bolted entries always in primary hash | |
957 | * But in some case we can find them in secondary too. | |
958 | */ | |
4ad90c86 AK |
959 | hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP; |
960 | slot = __pSeries_lpar_hpte_find(want_v, hpte_group); | |
d78d5dac AK |
961 | if (slot < 0) { |
962 | /* Try in secondary */ | |
963 | hpte_group = (~hash & htab_hash_mask) * HPTES_PER_GROUP; | |
964 | slot = __pSeries_lpar_hpte_find(want_v, hpte_group); | |
965 | if (slot < 0) | |
966 | return -1; | |
967 | } | |
4ad90c86 AK |
968 | return hpte_group + slot; |
969 | } | |
1da177e4 LT |
970 | |
971 | static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, | |
3c726f8d | 972 | unsigned long ea, |
1189be65 | 973 | int psize, int ssize) |
1da177e4 | 974 | { |
5524a27d AK |
975 | unsigned long vpn; |
976 | unsigned long lpar_rc, slot, vsid, flags; | |
1da177e4 | 977 | |
1189be65 | 978 | vsid = get_kernel_vsid(ea, ssize); |
5524a27d | 979 | vpn = hpt_vpn(ea, vsid, ssize); |
1da177e4 | 980 | |
5524a27d | 981 | slot = pSeries_lpar_hpte_find(vpn, psize, ssize); |
1da177e4 LT |
982 | BUG_ON(slot == -1); |
983 | ||
b56d55a5 | 984 | flags = newpp & (HPTE_R_PP | HPTE_R_N); |
e71ff982 BS |
985 | if (mmu_has_feature(MMU_FTR_KERNEL_RO)) |
986 | /* Move pp0 into bit 8 (IBM 55) */ | |
987 | flags |= (newpp & HPTE_R_PP0) >> 55; | |
988 | ||
b56d55a5 ME |
989 | flags |= ((newpp & HPTE_R_KEY_HI) >> 48) | (newpp & HPTE_R_KEY_LO); |
990 | ||
1da177e4 LT |
991 | lpar_rc = plpar_pte_protect(flags, slot, 0); |
992 | ||
706c8c93 | 993 | BUG_ON(lpar_rc != H_SUCCESS); |
1da177e4 LT |
994 | } |
995 | ||
5524a27d | 996 | static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn, |
db3d8534 AK |
997 | int psize, int apsize, |
998 | int ssize, int local) | |
1da177e4 | 999 | { |
3c726f8d | 1000 | unsigned long want_v; |
1da177e4 LT |
1001 | unsigned long lpar_rc; |
1002 | unsigned long dummy1, dummy2; | |
1003 | ||
5524a27d AK |
1004 | pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n", |
1005 | slot, vpn, psize, local); | |
1da177e4 | 1006 | |
5524a27d | 1007 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
1189be65 | 1008 | lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); |
706c8c93 | 1009 | if (lpar_rc == H_NOT_FOUND) |
1da177e4 LT |
1010 | return; |
1011 | ||
706c8c93 | 1012 | BUG_ON(lpar_rc != H_SUCCESS); |
1da177e4 LT |
1013 | } |
1014 | ||
ba2dd8a2 LD |
1015 | |
1016 | /* | |
1017 | * As defined in the PAPR's section 14.5.4.1.8 | |
1018 | * The control mask doesn't include the returned reference and change bit from | |
1019 | * the processed PTE. | |
1020 | */ | |
1021 | #define HBLKR_AVPN 0x0100000000000000UL | |
1022 | #define HBLKR_CTRL_MASK 0xf800000000000000UL | |
1023 | #define HBLKR_CTRL_SUCCESS 0x8000000000000000UL | |
1024 | #define HBLKR_CTRL_ERRNOTFOUND 0x8800000000000000UL | |
1025 | #define HBLKR_CTRL_ERRBUSY 0xa000000000000000UL | |
1026 | ||
59545ebe LD |
1027 | /* |
1028 | * Returned true if we are supporting this block size for the specified segment | |
1029 | * base page size and actual page size. | |
1030 | * | |
1031 | * Currently, we only support 8 size block. | |
1032 | */ | |
1033 | static inline bool is_supported_hlbkrm(int bpsize, int psize) | |
1034 | { | |
1035 | return (hblkrm_size[bpsize][psize] == HBLKRM_SUPPORTED_BLOCK_SIZE); | |
1036 | } | |
1037 | ||
ba2dd8a2 LD |
1038 | /** |
1039 | * H_BLOCK_REMOVE caller. | |
1040 | * @idx should point to the latest @param entry set with a PTEX. | |
1041 | * If PTE cannot be processed because another CPUs has already locked that | |
1042 | * group, those entries are put back in @param starting at index 1. | |
1043 | * If entries has to be retried and @retry_busy is set to true, these entries | |
1044 | * are retried until success. If @retry_busy is set to false, the returned | |
1045 | * is the number of entries yet to process. | |
1046 | */ | |
1047 | static unsigned long call_block_remove(unsigned long idx, unsigned long *param, | |
1048 | bool retry_busy) | |
1049 | { | |
1050 | unsigned long i, rc, new_idx; | |
1051 | unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; | |
1052 | ||
1053 | if (idx < 2) { | |
1054 | pr_warn("Unexpected empty call to H_BLOCK_REMOVE"); | |
1055 | return 0; | |
1056 | } | |
1057 | again: | |
1058 | new_idx = 0; | |
1059 | if (idx > PLPAR_HCALL9_BUFSIZE) { | |
1060 | pr_err("Too many PTEs (%lu) for H_BLOCK_REMOVE", idx); | |
1061 | idx = PLPAR_HCALL9_BUFSIZE; | |
1062 | } else if (idx < PLPAR_HCALL9_BUFSIZE) | |
1063 | param[idx] = HBR_END; | |
1064 | ||
1065 | rc = plpar_hcall9(H_BLOCK_REMOVE, retbuf, | |
1066 | param[0], /* AVA */ | |
1067 | param[1], param[2], param[3], param[4], /* TS0-7 */ | |
1068 | param[5], param[6], param[7], param[8]); | |
1069 | if (rc == H_SUCCESS) | |
1070 | return 0; | |
1071 | ||
1072 | BUG_ON(rc != H_PARTIAL); | |
1073 | ||
1074 | /* Check that the unprocessed entries were 'not found' or 'busy' */ | |
1075 | for (i = 0; i < idx-1; i++) { | |
1076 | unsigned long ctrl = retbuf[i] & HBLKR_CTRL_MASK; | |
1077 | ||
1078 | if (ctrl == HBLKR_CTRL_ERRBUSY) { | |
1079 | param[++new_idx] = param[i+1]; | |
1080 | continue; | |
1081 | } | |
1082 | ||
1083 | BUG_ON(ctrl != HBLKR_CTRL_SUCCESS | |
1084 | && ctrl != HBLKR_CTRL_ERRNOTFOUND); | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * If there were entries found busy, retry these entries if requested, | |
1089 | * of if all the entries have to be retried. | |
1090 | */ | |
1091 | if (new_idx && (retry_busy || new_idx == (PLPAR_HCALL9_BUFSIZE-1))) { | |
1092 | idx = new_idx + 1; | |
1093 | goto again; | |
1094 | } | |
1095 | ||
1096 | return new_idx; | |
1097 | } | |
1098 | ||
e34aa03c | 1099 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1a527286 AK |
1100 | /* |
1101 | * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need | |
1102 | * to make sure that we avoid bouncing the hypervisor tlbie lock. | |
1103 | */ | |
1104 | #define PPC64_HUGE_HPTE_BATCH 12 | |
1105 | ||
ba2dd8a2 LD |
1106 | static void hugepage_block_invalidate(unsigned long *slot, unsigned long *vpn, |
1107 | int count, int psize, int ssize) | |
1a527286 | 1108 | { |
05af40e8 | 1109 | unsigned long param[PLPAR_HCALL9_BUFSIZE]; |
ba2dd8a2 LD |
1110 | unsigned long shift, current_vpgb, vpgb; |
1111 | int i, pix = 0; | |
1a527286 | 1112 | |
ba2dd8a2 LD |
1113 | shift = mmu_psize_defs[psize].shift; |
1114 | ||
1115 | for (i = 0; i < count; i++) { | |
1116 | /* | |
1117 | * Shifting 3 bits more on the right to get a | |
1118 | * 8 pages aligned virtual addresse. | |
1119 | */ | |
1120 | vpgb = (vpn[i] >> (shift - VPN_SHIFT + 3)); | |
1121 | if (!pix || vpgb != current_vpgb) { | |
1122 | /* | |
1123 | * Need to start a new 8 pages block, flush | |
1124 | * the current one if needed. | |
1125 | */ | |
1126 | if (pix) | |
1127 | (void)call_block_remove(pix, param, true); | |
1128 | current_vpgb = vpgb; | |
1129 | param[0] = hpte_encode_avpn(vpn[i], psize, ssize); | |
1130 | pix = 1; | |
1131 | } | |
1132 | ||
1133 | param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot[i]; | |
1134 | if (pix == PLPAR_HCALL9_BUFSIZE) { | |
1135 | pix = call_block_remove(pix, param, false); | |
1136 | /* | |
1137 | * pix = 0 means that all the entries were | |
1138 | * removed, we can start a new block. | |
1139 | * Otherwise, this means that there are entries | |
1140 | * to retry, and pix points to latest one, so | |
1141 | * we should increment it and try to continue | |
1142 | * the same block. | |
1143 | */ | |
1144 | if (pix) | |
1145 | pix++; | |
1146 | } | |
1147 | } | |
1148 | if (pix) | |
1149 | (void)call_block_remove(pix, param, true); | |
1150 | } | |
1151 | ||
1152 | static void hugepage_bulk_invalidate(unsigned long *slot, unsigned long *vpn, | |
1153 | int count, int psize, int ssize) | |
1154 | { | |
1155 | unsigned long param[PLPAR_HCALL9_BUFSIZE]; | |
1156 | int i = 0, pix = 0, rc; | |
1a527286 AK |
1157 | |
1158 | for (i = 0; i < count; i++) { | |
1159 | ||
1160 | if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { | |
1161 | pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0, | |
1162 | ssize, 0); | |
1163 | } else { | |
1164 | param[pix] = HBR_REQUEST | HBR_AVPN | slot[i]; | |
1165 | param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize); | |
1166 | pix += 2; | |
1167 | if (pix == 8) { | |
1168 | rc = plpar_hcall9(H_BULK_REMOVE, param, | |
1169 | param[0], param[1], param[2], | |
1170 | param[3], param[4], param[5], | |
1171 | param[6], param[7]); | |
1172 | BUG_ON(rc != H_SUCCESS); | |
1173 | pix = 0; | |
1174 | } | |
1175 | } | |
1176 | } | |
1177 | if (pix) { | |
1178 | param[pix] = HBR_END; | |
1179 | rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], | |
1180 | param[2], param[3], param[4], param[5], | |
1181 | param[6], param[7]); | |
1182 | BUG_ON(rc != H_SUCCESS); | |
1183 | } | |
ba2dd8a2 LD |
1184 | } |
1185 | ||
1186 | static inline void __pSeries_lpar_hugepage_invalidate(unsigned long *slot, | |
1187 | unsigned long *vpn, | |
1188 | int count, int psize, | |
1189 | int ssize) | |
1190 | { | |
1191 | unsigned long flags = 0; | |
1192 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); | |
1193 | ||
1194 | if (lock_tlbie) | |
1195 | spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); | |
1196 | ||
59545ebe LD |
1197 | /* Assuming THP size is 16M */ |
1198 | if (is_supported_hlbkrm(psize, MMU_PAGE_16M)) | |
ba2dd8a2 LD |
1199 | hugepage_block_invalidate(slot, vpn, count, psize, ssize); |
1200 | else | |
1201 | hugepage_bulk_invalidate(slot, vpn, count, psize, ssize); | |
1a527286 AK |
1202 | |
1203 | if (lock_tlbie) | |
1204 | spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); | |
1205 | } | |
1206 | ||
fa1f8ae8 AK |
1207 | static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, |
1208 | unsigned long addr, | |
1209 | unsigned char *hpte_slot_array, | |
d557b098 | 1210 | int psize, int ssize, int local) |
1a527286 | 1211 | { |
fa1f8ae8 | 1212 | int i, index = 0; |
1a527286 AK |
1213 | unsigned long s_addr = addr; |
1214 | unsigned int max_hpte_count, valid; | |
1215 | unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH]; | |
1216 | unsigned long slot_array[PPC64_HUGE_HPTE_BATCH]; | |
fa1f8ae8 | 1217 | unsigned long shift, hidx, vpn = 0, hash, slot; |
1a527286 AK |
1218 | |
1219 | shift = mmu_psize_defs[psize].shift; | |
1220 | max_hpte_count = 1U << (PMD_SHIFT - shift); | |
1221 | ||
1222 | for (i = 0; i < max_hpte_count; i++) { | |
1223 | valid = hpte_valid(hpte_slot_array, i); | |
1224 | if (!valid) | |
1225 | continue; | |
1226 | hidx = hpte_hash_index(hpte_slot_array, i); | |
1227 | ||
1228 | /* get the vpn */ | |
1229 | addr = s_addr + (i * (1ul << shift)); | |
1a527286 AK |
1230 | vpn = hpt_vpn(addr, vsid, ssize); |
1231 | hash = hpt_hash(vpn, shift, ssize); | |
1232 | if (hidx & _PTEIDX_SECONDARY) | |
1233 | hash = ~hash; | |
1234 | ||
1235 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; | |
1236 | slot += hidx & _PTEIDX_GROUP_IX; | |
1237 | ||
1238 | slot_array[index] = slot; | |
1239 | vpn_array[index] = vpn; | |
1240 | if (index == PPC64_HUGE_HPTE_BATCH - 1) { | |
1241 | /* | |
1242 | * Now do a bluk invalidate | |
1243 | */ | |
1244 | __pSeries_lpar_hugepage_invalidate(slot_array, | |
1245 | vpn_array, | |
1246 | PPC64_HUGE_HPTE_BATCH, | |
1247 | psize, ssize); | |
1248 | index = 0; | |
1249 | } else | |
1250 | index++; | |
1251 | } | |
1252 | if (index) | |
1253 | __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array, | |
1254 | index, psize, ssize); | |
1255 | } | |
e34aa03c AK |
1256 | #else |
1257 | static void pSeries_lpar_hugepage_invalidate(unsigned long vsid, | |
1258 | unsigned long addr, | |
1259 | unsigned char *hpte_slot_array, | |
1260 | int psize, int ssize, int local) | |
1261 | { | |
1262 | WARN(1, "%s called without THP support\n", __func__); | |
1263 | } | |
1264 | #endif | |
1a527286 | 1265 | |
27828f98 DG |
1266 | static int pSeries_lpar_hpte_removebolted(unsigned long ea, |
1267 | int psize, int ssize) | |
f8c8803b | 1268 | { |
5524a27d AK |
1269 | unsigned long vpn; |
1270 | unsigned long slot, vsid; | |
f8c8803b BP |
1271 | |
1272 | vsid = get_kernel_vsid(ea, ssize); | |
5524a27d | 1273 | vpn = hpt_vpn(ea, vsid, ssize); |
f8c8803b | 1274 | |
5524a27d | 1275 | slot = pSeries_lpar_hpte_find(vpn, psize, ssize); |
27828f98 DG |
1276 | if (slot == -1) |
1277 | return -ENOENT; | |
1278 | ||
db3d8534 AK |
1279 | /* |
1280 | * lpar doesn't use the passed actual page size | |
1281 | */ | |
1282 | pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0); | |
27828f98 | 1283 | return 0; |
f8c8803b BP |
1284 | } |
1285 | ||
0effa488 LD |
1286 | |
1287 | static inline unsigned long compute_slot(real_pte_t pte, | |
1288 | unsigned long vpn, | |
1289 | unsigned long index, | |
1290 | unsigned long shift, | |
1291 | int ssize) | |
1292 | { | |
1293 | unsigned long slot, hash, hidx; | |
1294 | ||
1295 | hash = hpt_hash(vpn, shift, ssize); | |
1296 | hidx = __rpte_to_hidx(pte, index); | |
1297 | if (hidx & _PTEIDX_SECONDARY) | |
1298 | hash = ~hash; | |
1299 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; | |
1300 | slot += hidx & _PTEIDX_GROUP_IX; | |
1301 | return slot; | |
1302 | } | |
1303 | ||
ba2dd8a2 LD |
1304 | /** |
1305 | * The hcall H_BLOCK_REMOVE implies that the virtual pages to processed are | |
1306 | * "all within the same naturally aligned 8 page virtual address block". | |
1307 | */ | |
1308 | static void do_block_remove(unsigned long number, struct ppc64_tlb_batch *batch, | |
1309 | unsigned long *param) | |
1310 | { | |
1311 | unsigned long vpn; | |
1312 | unsigned long i, pix = 0; | |
1313 | unsigned long index, shift, slot, current_vpgb, vpgb; | |
1314 | real_pte_t pte; | |
1315 | int psize, ssize; | |
1316 | ||
1317 | psize = batch->psize; | |
1318 | ssize = batch->ssize; | |
1319 | ||
1320 | for (i = 0; i < number; i++) { | |
1321 | vpn = batch->vpn[i]; | |
1322 | pte = batch->pte[i]; | |
1323 | pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { | |
1324 | /* | |
1325 | * Shifting 3 bits more on the right to get a | |
1326 | * 8 pages aligned virtual addresse. | |
1327 | */ | |
1328 | vpgb = (vpn >> (shift - VPN_SHIFT + 3)); | |
1329 | if (!pix || vpgb != current_vpgb) { | |
1330 | /* | |
1331 | * Need to start a new 8 pages block, flush | |
1332 | * the current one if needed. | |
1333 | */ | |
1334 | if (pix) | |
1335 | (void)call_block_remove(pix, param, | |
1336 | true); | |
1337 | current_vpgb = vpgb; | |
1338 | param[0] = hpte_encode_avpn(vpn, psize, | |
1339 | ssize); | |
1340 | pix = 1; | |
1341 | } | |
1342 | ||
1343 | slot = compute_slot(pte, vpn, index, shift, ssize); | |
1344 | param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot; | |
1345 | ||
1346 | if (pix == PLPAR_HCALL9_BUFSIZE) { | |
1347 | pix = call_block_remove(pix, param, false); | |
1348 | /* | |
1349 | * pix = 0 means that all the entries were | |
1350 | * removed, we can start a new block. | |
1351 | * Otherwise, this means that there are entries | |
1352 | * to retry, and pix points to latest one, so | |
1353 | * we should increment it and try to continue | |
1354 | * the same block. | |
1355 | */ | |
1356 | if (pix) | |
1357 | pix++; | |
1358 | } | |
1359 | } pte_iterate_hashed_end(); | |
1360 | } | |
1361 | ||
1362 | if (pix) | |
1363 | (void)call_block_remove(pix, param, true); | |
1364 | } | |
1365 | ||
1211ee61 LD |
1366 | /* |
1367 | * TLB Block Invalidate Characteristics | |
1368 | * | |
1369 | * These characteristics define the size of the block the hcall H_BLOCK_REMOVE | |
1370 | * is able to process for each couple segment base page size, actual page size. | |
1371 | * | |
1372 | * The ibm,get-system-parameter properties is returning a buffer with the | |
1373 | * following layout: | |
1374 | * | |
1375 | * [ 2 bytes size of the RTAS buffer (excluding these 2 bytes) ] | |
1376 | * ----------------- | |
1377 | * TLB Block Invalidate Specifiers: | |
1378 | * [ 1 byte LOG base 2 of the TLB invalidate block size being specified ] | |
1379 | * [ 1 byte Number of page sizes (N) that are supported for the specified | |
1380 | * TLB invalidate block size ] | |
1381 | * [ 1 byte Encoded segment base page size and actual page size | |
1382 | * MSB=0 means 4k segment base page size and actual page size | |
1383 | * MSB=1 the penc value in mmu_psize_def ] | |
1384 | * ... | |
1385 | * ----------------- | |
1386 | * Next TLB Block Invalidate Specifiers... | |
1387 | * ----------------- | |
1388 | * [ 0 ] | |
1389 | */ | |
1390 | static inline void set_hblkrm_bloc_size(int bpsize, int psize, | |
1391 | unsigned int block_size) | |
1392 | { | |
1393 | if (block_size > hblkrm_size[bpsize][psize]) | |
1394 | hblkrm_size[bpsize][psize] = block_size; | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * Decode the Encoded segment base page size and actual page size. | |
1399 | * PAPR specifies: | |
1400 | * - bit 7 is the L bit | |
1401 | * - bits 0-5 are the penc value | |
1402 | * If the L bit is 0, this means 4K segment base page size and actual page size | |
1403 | * otherwise the penc value should be read. | |
1404 | */ | |
1405 | #define HBLKRM_L_MASK 0x80 | |
1406 | #define HBLKRM_PENC_MASK 0x3f | |
1407 | static inline void __init check_lp_set_hblkrm(unsigned int lp, | |
1408 | unsigned int block_size) | |
1409 | { | |
1410 | unsigned int bpsize, psize; | |
1411 | ||
1412 | /* First, check the L bit, if not set, this means 4K */ | |
1413 | if ((lp & HBLKRM_L_MASK) == 0) { | |
1414 | set_hblkrm_bloc_size(MMU_PAGE_4K, MMU_PAGE_4K, block_size); | |
1415 | return; | |
1416 | } | |
1417 | ||
1418 | lp &= HBLKRM_PENC_MASK; | |
1419 | for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++) { | |
1420 | struct mmu_psize_def *def = &mmu_psize_defs[bpsize]; | |
1421 | ||
1422 | for (psize = 0; psize < MMU_PAGE_COUNT; psize++) { | |
1423 | if (def->penc[psize] == lp) { | |
1424 | set_hblkrm_bloc_size(bpsize, psize, block_size); | |
1425 | return; | |
1426 | } | |
1427 | } | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | #define SPLPAR_TLB_BIC_TOKEN 50 | |
1432 | ||
1433 | /* | |
1434 | * The size of the TLB Block Invalidate Characteristics is variable. But at the | |
1435 | * maximum it will be the number of possible page sizes *2 + 10 bytes. | |
1436 | * Currently MMU_PAGE_COUNT is 16, which means 42 bytes. Use a cache line size | |
1437 | * (128 bytes) for the buffer to get plenty of space. | |
1438 | */ | |
1439 | #define SPLPAR_TLB_BIC_MAXLENGTH 128 | |
1440 | ||
1441 | void __init pseries_lpar_read_hblkrm_characteristics(void) | |
1442 | { | |
1443 | unsigned char local_buffer[SPLPAR_TLB_BIC_MAXLENGTH]; | |
1444 | int call_status, len, idx, bpsize; | |
1445 | ||
4ab8a485 LD |
1446 | if (!firmware_has_feature(FW_FEATURE_BLOCK_REMOVE)) |
1447 | return; | |
1448 | ||
1211ee61 LD |
1449 | spin_lock(&rtas_data_buf_lock); |
1450 | memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); | |
1451 | call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, | |
1452 | NULL, | |
1453 | SPLPAR_TLB_BIC_TOKEN, | |
1454 | __pa(rtas_data_buf), | |
1455 | RTAS_DATA_BUF_SIZE); | |
1456 | memcpy(local_buffer, rtas_data_buf, SPLPAR_TLB_BIC_MAXLENGTH); | |
1457 | local_buffer[SPLPAR_TLB_BIC_MAXLENGTH - 1] = '\0'; | |
1458 | spin_unlock(&rtas_data_buf_lock); | |
1459 | ||
1460 | if (call_status != 0) { | |
1461 | pr_warn("%s %s Error calling get-system-parameter (0x%x)\n", | |
1462 | __FILE__, __func__, call_status); | |
1463 | return; | |
1464 | } | |
1465 | ||
1466 | /* | |
1467 | * The first two (2) bytes of the data in the buffer are the length of | |
1468 | * the returned data, not counting these first two (2) bytes. | |
1469 | */ | |
1470 | len = be16_to_cpu(*((u16 *)local_buffer)) + 2; | |
1471 | if (len > SPLPAR_TLB_BIC_MAXLENGTH) { | |
1472 | pr_warn("%s too large returned buffer %d", __func__, len); | |
1473 | return; | |
1474 | } | |
1475 | ||
1476 | idx = 2; | |
1477 | while (idx < len) { | |
1478 | u8 block_shift = local_buffer[idx++]; | |
1479 | u32 block_size; | |
1480 | unsigned int npsize; | |
1481 | ||
1482 | if (!block_shift) | |
1483 | break; | |
1484 | ||
1485 | block_size = 1 << block_shift; | |
1486 | ||
1487 | for (npsize = local_buffer[idx++]; | |
1488 | npsize > 0 && idx < len; npsize--) | |
1489 | check_lp_set_hblkrm((unsigned int) local_buffer[idx++], | |
1490 | block_size); | |
1491 | } | |
1492 | ||
1493 | for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++) | |
1494 | for (idx = 0; idx < MMU_PAGE_COUNT; idx++) | |
1495 | if (hblkrm_size[bpsize][idx]) | |
1496 | pr_info("H_BLOCK_REMOVE supports base psize:%d psize:%d block size:%d", | |
1497 | bpsize, idx, hblkrm_size[bpsize][idx]); | |
1498 | } | |
1499 | ||
1da177e4 LT |
1500 | /* |
1501 | * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie | |
1502 | * lock. | |
1503 | */ | |
035223fb | 1504 | static void pSeries_lpar_flush_hash_range(unsigned long number, int local) |
1da177e4 | 1505 | { |
5524a27d | 1506 | unsigned long vpn; |
f03e64f2 | 1507 | unsigned long i, pix, rc; |
12e86f92 | 1508 | unsigned long flags = 0; |
69111bac | 1509 | struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch); |
44ae3ab3 | 1510 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); |
05af40e8 | 1511 | unsigned long param[PLPAR_HCALL9_BUFSIZE]; |
0effa488 | 1512 | unsigned long index, shift, slot; |
f03e64f2 | 1513 | real_pte_t pte; |
1189be65 | 1514 | int psize, ssize; |
1da177e4 LT |
1515 | |
1516 | if (lock_tlbie) | |
1517 | spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); | |
1518 | ||
59545ebe | 1519 | if (is_supported_hlbkrm(batch->psize, batch->psize)) { |
ba2dd8a2 LD |
1520 | do_block_remove(number, batch, param); |
1521 | goto out; | |
1522 | } | |
1523 | ||
f03e64f2 | 1524 | psize = batch->psize; |
1189be65 | 1525 | ssize = batch->ssize; |
f03e64f2 PM |
1526 | pix = 0; |
1527 | for (i = 0; i < number; i++) { | |
5524a27d | 1528 | vpn = batch->vpn[i]; |
f03e64f2 | 1529 | pte = batch->pte[i]; |
5524a27d | 1530 | pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { |
0effa488 | 1531 | slot = compute_slot(pte, vpn, index, shift, ssize); |
12e86f92 | 1532 | if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { |
db3d8534 AK |
1533 | /* |
1534 | * lpar doesn't use the passed actual page size | |
1535 | */ | |
5524a27d | 1536 | pSeries_lpar_hpte_invalidate(slot, vpn, psize, |
db3d8534 | 1537 | 0, ssize, local); |
12e86f92 PM |
1538 | } else { |
1539 | param[pix] = HBR_REQUEST | HBR_AVPN | slot; | |
5524a27d | 1540 | param[pix+1] = hpte_encode_avpn(vpn, psize, |
1189be65 | 1541 | ssize); |
12e86f92 PM |
1542 | pix += 2; |
1543 | if (pix == 8) { | |
1544 | rc = plpar_hcall9(H_BULK_REMOVE, param, | |
f03e64f2 PM |
1545 | param[0], param[1], param[2], |
1546 | param[3], param[4], param[5], | |
1547 | param[6], param[7]); | |
12e86f92 PM |
1548 | BUG_ON(rc != H_SUCCESS); |
1549 | pix = 0; | |
1550 | } | |
f03e64f2 PM |
1551 | } |
1552 | } pte_iterate_hashed_end(); | |
1553 | } | |
1554 | if (pix) { | |
1555 | param[pix] = HBR_END; | |
1556 | rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], | |
1557 | param[2], param[3], param[4], param[5], | |
1558 | param[6], param[7]); | |
1559 | BUG_ON(rc != H_SUCCESS); | |
1560 | } | |
1da177e4 | 1561 | |
ba2dd8a2 | 1562 | out: |
1da177e4 LT |
1563 | if (lock_tlbie) |
1564 | spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); | |
1565 | } | |
1566 | ||
4e89a2d8 WS |
1567 | static int __init disable_bulk_remove(char *str) |
1568 | { | |
1569 | if (strcmp(str, "off") == 0 && | |
1570 | firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { | |
65471d76 AK |
1571 | pr_info("Disabling BULK_REMOVE firmware feature"); |
1572 | powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE; | |
4e89a2d8 WS |
1573 | } |
1574 | return 1; | |
1575 | } | |
1576 | ||
1577 | __setup("bulk_remove=", disable_bulk_remove); | |
1578 | ||
dbcf929c DG |
1579 | #define HPT_RESIZE_TIMEOUT 10000 /* ms */ |
1580 | ||
1581 | struct hpt_resize_state { | |
1582 | unsigned long shift; | |
1583 | int commit_rc; | |
1584 | }; | |
1585 | ||
1586 | static int pseries_lpar_resize_hpt_commit(void *data) | |
1587 | { | |
1588 | struct hpt_resize_state *state = data; | |
1589 | ||
1590 | state->commit_rc = plpar_resize_hpt_commit(0, state->shift); | |
1591 | if (state->commit_rc != H_SUCCESS) | |
1592 | return -EIO; | |
1593 | ||
1594 | /* Hypervisor has transitioned the HTAB, update our globals */ | |
1595 | ppc64_pft_size = state->shift; | |
1596 | htab_size_bytes = 1UL << ppc64_pft_size; | |
1597 | htab_hash_mask = (htab_size_bytes >> 7) - 1; | |
1598 | ||
1599 | return 0; | |
1600 | } | |
1601 | ||
c784be43 GS |
1602 | /* |
1603 | * Must be called in process context. The caller must hold the | |
1604 | * cpus_lock. | |
1605 | */ | |
dbcf929c DG |
1606 | static int pseries_lpar_resize_hpt(unsigned long shift) |
1607 | { | |
1608 | struct hpt_resize_state state = { | |
1609 | .shift = shift, | |
1610 | .commit_rc = H_FUNCTION, | |
1611 | }; | |
1612 | unsigned int delay, total_delay = 0; | |
1613 | int rc; | |
1614 | ktime_t t0, t1, t2; | |
1615 | ||
1616 | might_sleep(); | |
1617 | ||
1618 | if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE)) | |
1619 | return -ENODEV; | |
1620 | ||
65471d76 | 1621 | pr_info("Attempting to resize HPT to shift %lu\n", shift); |
dbcf929c DG |
1622 | |
1623 | t0 = ktime_get(); | |
1624 | ||
1625 | rc = plpar_resize_hpt_prepare(0, shift); | |
1626 | while (H_IS_LONG_BUSY(rc)) { | |
1627 | delay = get_longbusy_msecs(rc); | |
1628 | total_delay += delay; | |
1629 | if (total_delay > HPT_RESIZE_TIMEOUT) { | |
1630 | /* prepare with shift==0 cancels an in-progress resize */ | |
1631 | rc = plpar_resize_hpt_prepare(0, 0); | |
1632 | if (rc != H_SUCCESS) | |
65471d76 | 1633 | pr_warn("Unexpected error %d cancelling timed out HPT resize\n", |
dbcf929c DG |
1634 | rc); |
1635 | return -ETIMEDOUT; | |
1636 | } | |
1637 | msleep(delay); | |
1638 | rc = plpar_resize_hpt_prepare(0, shift); | |
01ed0510 | 1639 | } |
dbcf929c DG |
1640 | |
1641 | switch (rc) { | |
1642 | case H_SUCCESS: | |
1643 | /* Continue on */ | |
1644 | break; | |
1645 | ||
1646 | case H_PARAMETER: | |
f172acbf | 1647 | pr_warn("Invalid argument from H_RESIZE_HPT_PREPARE\n"); |
dbcf929c DG |
1648 | return -EINVAL; |
1649 | case H_RESOURCE: | |
f172acbf | 1650 | pr_warn("Operation not permitted from H_RESIZE_HPT_PREPARE\n"); |
dbcf929c DG |
1651 | return -EPERM; |
1652 | default: | |
65471d76 | 1653 | pr_warn("Unexpected error %d from H_RESIZE_HPT_PREPARE\n", rc); |
dbcf929c DG |
1654 | return -EIO; |
1655 | } | |
1656 | ||
1657 | t1 = ktime_get(); | |
1658 | ||
c784be43 GS |
1659 | rc = stop_machine_cpuslocked(pseries_lpar_resize_hpt_commit, |
1660 | &state, NULL); | |
dbcf929c DG |
1661 | |
1662 | t2 = ktime_get(); | |
1663 | ||
1664 | if (rc != 0) { | |
1665 | switch (state.commit_rc) { | |
1666 | case H_PTEG_FULL: | |
dbcf929c DG |
1667 | return -ENOSPC; |
1668 | ||
1669 | default: | |
65471d76 AK |
1670 | pr_warn("Unexpected error %d from H_RESIZE_HPT_COMMIT\n", |
1671 | state.commit_rc); | |
dbcf929c DG |
1672 | return -EIO; |
1673 | }; | |
1674 | } | |
1675 | ||
65471d76 AK |
1676 | pr_info("HPT resize to shift %lu complete (%lld ms / %lld ms)\n", |
1677 | shift, (long long) ktime_ms_delta(t1, t0), | |
1678 | (long long) ktime_ms_delta(t2, t1)); | |
dbcf929c DG |
1679 | |
1680 | return 0; | |
1681 | } | |
1682 | ||
cc3d2940 PM |
1683 | static int pseries_lpar_register_process_table(unsigned long base, |
1684 | unsigned long page_size, unsigned long table_size) | |
1685 | { | |
1686 | long rc; | |
dbfcf3cb | 1687 | unsigned long flags = 0; |
cc3d2940 | 1688 | |
dbfcf3cb PM |
1689 | if (table_size) |
1690 | flags |= PROC_TABLE_NEW; | |
b6c84175 BR |
1691 | if (radix_enabled()) { |
1692 | flags |= PROC_TABLE_RADIX; | |
1693 | if (mmu_has_feature(MMU_FTR_GTSE)) | |
1694 | flags |= PROC_TABLE_GTSE; | |
1695 | } else | |
dbfcf3cb | 1696 | flags |= PROC_TABLE_HPT_SLB; |
cc3d2940 PM |
1697 | for (;;) { |
1698 | rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base, | |
1699 | page_size, table_size); | |
1700 | if (!H_IS_LONG_BUSY(rc)) | |
1701 | break; | |
1702 | mdelay(get_longbusy_msecs(rc)); | |
1703 | } | |
1704 | if (rc != H_SUCCESS) { | |
1705 | pr_err("Failed to register process table (rc=%ld)\n", rc); | |
1706 | BUG(); | |
1707 | } | |
1708 | return rc; | |
1709 | } | |
1710 | ||
6364e84e | 1711 | void __init hpte_init_pseries(void) |
1da177e4 | 1712 | { |
7025776e BH |
1713 | mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate; |
1714 | mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp; | |
1715 | mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; | |
1716 | mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert; | |
1717 | mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove; | |
1718 | mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted; | |
1719 | mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range; | |
5246adec | 1720 | mmu_hash_ops.hpte_clear_all = pseries_hpte_clear_all; |
7025776e | 1721 | mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate; |
8971e1c7 ME |
1722 | |
1723 | if (firmware_has_feature(FW_FEATURE_HPT_RESIZE)) | |
1724 | mmu_hash_ops.resize_hpt = pseries_lpar_resize_hpt; | |
ed6546bd NP |
1725 | |
1726 | /* | |
1727 | * On POWER9, we need to do a H_REGISTER_PROC_TBL hcall | |
1728 | * to inform the hypervisor that we wish to use the HPT. | |
1729 | */ | |
1730 | if (cpu_has_feature(CPU_FTR_ARCH_300)) | |
1731 | pseries_lpar_register_process_table(0, 0, 0); | |
1da177e4 | 1732 | } |
14f966e7 | 1733 | |
bda7673d | 1734 | #ifdef CONFIG_PPC_RADIX_MMU |
cc3d2940 PM |
1735 | void radix_init_pseries(void) |
1736 | { | |
1737 | pr_info("Using radix MMU under hypervisor\n"); | |
ed6546bd NP |
1738 | |
1739 | pseries_lpar_register_process_table(__pa(process_tb), | |
1740 | 0, PRTB_SIZE_SHIFT - 12); | |
cc3d2940 | 1741 | } |
bda7673d | 1742 | #endif |
cc3d2940 | 1743 | |
14f966e7 RJ |
1744 | #ifdef CONFIG_PPC_SMLPAR |
1745 | #define CMO_FREE_HINT_DEFAULT 1 | |
1746 | static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; | |
1747 | ||
1748 | static int __init cmo_free_hint(char *str) | |
1749 | { | |
1750 | char *parm; | |
1751 | parm = strstrip(str); | |
1752 | ||
1753 | if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { | |
65471d76 | 1754 | pr_info("%s: CMO free page hinting is not active.\n", __func__); |
14f966e7 RJ |
1755 | cmo_free_hint_flag = 0; |
1756 | return 1; | |
1757 | } | |
1758 | ||
1759 | cmo_free_hint_flag = 1; | |
65471d76 | 1760 | pr_info("%s: CMO free page hinting is active.\n", __func__); |
14f966e7 RJ |
1761 | |
1762 | if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) | |
1763 | return 1; | |
1764 | ||
1765 | return 0; | |
1766 | } | |
1767 | ||
1768 | __setup("cmo_free_hint=", cmo_free_hint); | |
1769 | ||
1770 | static void pSeries_set_page_state(struct page *page, int order, | |
1771 | unsigned long state) | |
1772 | { | |
1773 | int i, j; | |
1774 | unsigned long cmo_page_sz, addr; | |
1775 | ||
1776 | cmo_page_sz = cmo_get_page_size(); | |
1777 | addr = __pa((unsigned long)page_address(page)); | |
1778 | ||
1779 | for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { | |
1780 | for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) | |
1781 | plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); | |
1782 | } | |
1783 | } | |
1784 | ||
1785 | void arch_free_page(struct page *page, int order) | |
1786 | { | |
d8c476ee AK |
1787 | if (radix_enabled()) |
1788 | return; | |
14f966e7 RJ |
1789 | if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) |
1790 | return; | |
1791 | ||
1792 | pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); | |
1793 | } | |
1794 | EXPORT_SYMBOL(arch_free_page); | |
1795 | ||
d8c476ee | 1796 | #endif /* CONFIG_PPC_SMLPAR */ |
4e003747 | 1797 | #endif /* CONFIG_PPC_BOOK3S_64 */ |
c8cd093a AB |
1798 | |
1799 | #ifdef CONFIG_TRACEPOINTS | |
e9666d10 | 1800 | #ifdef CONFIG_JUMP_LABEL |
cc1adb5f AB |
1801 | struct static_key hcall_tracepoint_key = STATIC_KEY_INIT; |
1802 | ||
8cf868af | 1803 | int hcall_tracepoint_regfunc(void) |
cc1adb5f AB |
1804 | { |
1805 | static_key_slow_inc(&hcall_tracepoint_key); | |
8cf868af | 1806 | return 0; |
cc1adb5f AB |
1807 | } |
1808 | ||
1809 | void hcall_tracepoint_unregfunc(void) | |
1810 | { | |
1811 | static_key_slow_dec(&hcall_tracepoint_key); | |
1812 | } | |
1813 | #else | |
c8cd093a AB |
1814 | /* |
1815 | * We optimise our hcall path by placing hcall_tracepoint_refcount | |
1816 | * directly in the TOC so we can check if the hcall tracepoints are | |
1817 | * enabled via a single load. | |
1818 | */ | |
1819 | ||
1820 | /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ | |
1821 | extern long hcall_tracepoint_refcount; | |
1822 | ||
8cf868af | 1823 | int hcall_tracepoint_regfunc(void) |
c8cd093a AB |
1824 | { |
1825 | hcall_tracepoint_refcount++; | |
8cf868af | 1826 | return 0; |
c8cd093a AB |
1827 | } |
1828 | ||
1829 | void hcall_tracepoint_unregfunc(void) | |
1830 | { | |
1831 | hcall_tracepoint_refcount--; | |
1832 | } | |
cc1adb5f AB |
1833 | #endif |
1834 | ||
1835 | /* | |
4f242fc5 NP |
1836 | * Keep track of hcall tracing depth and prevent recursion. Warn if any is |
1837 | * detected because it may indicate a problem. This will not catch all | |
1838 | * problems with tracing code making hcalls, because the tracing might have | |
1839 | * been invoked from a non-hcall, so the first hcall could recurse into it | |
1840 | * without warning here, but this better than nothing. | |
1841 | * | |
1842 | * Hcalls with specific problems being traced should use the _notrace | |
1843 | * plpar_hcall variants. | |
cc1adb5f AB |
1844 | */ |
1845 | static DEFINE_PER_CPU(unsigned int, hcall_trace_depth); | |
1846 | ||
c8cd093a | 1847 | |
a3f1a39a | 1848 | notrace void __trace_hcall_entry(unsigned long opcode, unsigned long *args) |
c8cd093a | 1849 | { |
57cdfdf8 AB |
1850 | unsigned long flags; |
1851 | unsigned int *depth; | |
1852 | ||
1853 | local_irq_save(flags); | |
1854 | ||
69111bac | 1855 | depth = this_cpu_ptr(&hcall_trace_depth); |
57cdfdf8 | 1856 | |
4f242fc5 | 1857 | if (WARN_ON_ONCE(*depth)) |
57cdfdf8 AB |
1858 | goto out; |
1859 | ||
1860 | (*depth)++; | |
e4f387d8 | 1861 | preempt_disable(); |
6f26353c | 1862 | trace_hcall_entry(opcode, args); |
57cdfdf8 AB |
1863 | (*depth)--; |
1864 | ||
1865 | out: | |
1866 | local_irq_restore(flags); | |
c8cd093a AB |
1867 | } |
1868 | ||
a3f1a39a | 1869 | notrace void __trace_hcall_exit(long opcode, long retval, unsigned long *retbuf) |
c8cd093a | 1870 | { |
57cdfdf8 AB |
1871 | unsigned long flags; |
1872 | unsigned int *depth; | |
1873 | ||
1874 | local_irq_save(flags); | |
1875 | ||
69111bac | 1876 | depth = this_cpu_ptr(&hcall_trace_depth); |
57cdfdf8 | 1877 | |
4f242fc5 | 1878 | if (*depth) /* Don't warn again on the way out */ |
57cdfdf8 AB |
1879 | goto out; |
1880 | ||
1881 | (*depth)++; | |
6f26353c | 1882 | trace_hcall_exit(opcode, retval, retbuf); |
e4f387d8 | 1883 | preempt_enable(); |
57cdfdf8 AB |
1884 | (*depth)--; |
1885 | ||
1886 | out: | |
1887 | local_irq_restore(flags); | |
c8cd093a AB |
1888 | } |
1889 | #endif | |
9ee820fa BK |
1890 | |
1891 | /** | |
1892 | * h_get_mpp | |
1893 | * H_GET_MPP hcall returns info in 7 parms | |
1894 | */ | |
1895 | int h_get_mpp(struct hvcall_mpp_data *mpp_data) | |
1896 | { | |
1897 | int rc; | |
1898 | unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; | |
1899 | ||
1900 | rc = plpar_hcall9(H_GET_MPP, retbuf); | |
1901 | ||
1902 | mpp_data->entitled_mem = retbuf[0]; | |
1903 | mpp_data->mapped_mem = retbuf[1]; | |
1904 | ||
1905 | mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff; | |
1906 | mpp_data->pool_num = retbuf[2] & 0xffff; | |
1907 | ||
1908 | mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff; | |
1909 | mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff; | |
b0d436c7 | 1910 | mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL; |
9ee820fa BK |
1911 | |
1912 | mpp_data->pool_size = retbuf[4]; | |
1913 | mpp_data->loan_request = retbuf[5]; | |
1914 | mpp_data->backing_mem = retbuf[6]; | |
1915 | ||
1916 | return rc; | |
1917 | } | |
1918 | EXPORT_SYMBOL(h_get_mpp); | |
1919 | ||
1920 | int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data) | |
1921 | { | |
1922 | int rc; | |
1923 | unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 }; | |
1924 | ||
1925 | rc = plpar_hcall9(H_GET_MPP_X, retbuf); | |
1926 | ||
1927 | mpp_x_data->coalesced_bytes = retbuf[0]; | |
1928 | mpp_x_data->pool_coalesced_bytes = retbuf[1]; | |
1929 | mpp_x_data->pool_purr_cycles = retbuf[2]; | |
1930 | mpp_x_data->pool_spurr_cycles = retbuf[3]; | |
1931 | ||
1932 | return rc; | |
1933 | } | |
82228e36 AK |
1934 | |
1935 | static unsigned long vsid_unscramble(unsigned long vsid, int ssize) | |
1936 | { | |
1937 | unsigned long protovsid; | |
1938 | unsigned long va_bits = VA_BITS; | |
1939 | unsigned long modinv, vsid_modulus; | |
1940 | unsigned long max_mod_inv, tmp_modinv; | |
1941 | ||
1942 | if (!mmu_has_feature(MMU_FTR_68_BIT_VA)) | |
1943 | va_bits = 65; | |
1944 | ||
1945 | if (ssize == MMU_SEGSIZE_256M) { | |
1946 | modinv = VSID_MULINV_256M; | |
1947 | vsid_modulus = ((1UL << (va_bits - SID_SHIFT)) - 1); | |
1948 | } else { | |
1949 | modinv = VSID_MULINV_1T; | |
1950 | vsid_modulus = ((1UL << (va_bits - SID_SHIFT_1T)) - 1); | |
1951 | } | |
1952 | ||
1953 | /* | |
1954 | * vsid outside our range. | |
1955 | */ | |
1956 | if (vsid >= vsid_modulus) | |
1957 | return 0; | |
1958 | ||
1959 | /* | |
1960 | * If modinv is the modular multiplicate inverse of (x % vsid_modulus) | |
1961 | * and vsid = (protovsid * x) % vsid_modulus, then we say: | |
1962 | * protovsid = (vsid * modinv) % vsid_modulus | |
1963 | */ | |
1964 | ||
1965 | /* Check if (vsid * modinv) overflow (63 bits) */ | |
1966 | max_mod_inv = 0x7fffffffffffffffull / vsid; | |
1967 | if (modinv < max_mod_inv) | |
1968 | return (vsid * modinv) % vsid_modulus; | |
1969 | ||
1970 | tmp_modinv = modinv/max_mod_inv; | |
1971 | modinv %= max_mod_inv; | |
1972 | ||
1973 | protovsid = (((vsid * max_mod_inv) % vsid_modulus) * tmp_modinv) % vsid_modulus; | |
1974 | protovsid = (protovsid + vsid * modinv) % vsid_modulus; | |
1975 | ||
1976 | return protovsid; | |
1977 | } | |
1978 | ||
1979 | static int __init reserve_vrma_context_id(void) | |
1980 | { | |
1981 | unsigned long protovsid; | |
1982 | ||
1983 | /* | |
1984 | * Reserve context ids which map to reserved virtual addresses. For now | |
1985 | * we only reserve the context id which maps to the VRMA VSID. We ignore | |
1986 | * the addresses in "ibm,adjunct-virtual-addresses" because we don't | |
1987 | * enable adjunct support via the "ibm,client-architecture-support" | |
1988 | * interface. | |
1989 | */ | |
1990 | protovsid = vsid_unscramble(VRMA_VSID, MMU_SEGSIZE_1T); | |
1991 | hash__reserve_context_id(protovsid >> ESID_BITS_1T); | |
1992 | return 0; | |
1993 | } | |
1994 | machine_device_initcall(pseries, reserve_vrma_context_id); | |
c6c26fb5 AP |
1995 | |
1996 | #ifdef CONFIG_DEBUG_FS | |
1997 | /* debugfs file interface for vpa data */ | |
1998 | static ssize_t vpa_file_read(struct file *filp, char __user *buf, size_t len, | |
1999 | loff_t *pos) | |
2000 | { | |
2001 | int cpu = (long)filp->private_data; | |
2002 | struct lppaca *lppaca = &lppaca_of(cpu); | |
2003 | ||
2004 | return simple_read_from_buffer(buf, len, pos, lppaca, | |
2005 | sizeof(struct lppaca)); | |
2006 | } | |
2007 | ||
2008 | static const struct file_operations vpa_fops = { | |
2009 | .open = simple_open, | |
2010 | .read = vpa_file_read, | |
2011 | .llseek = default_llseek, | |
2012 | }; | |
2013 | ||
2014 | static int __init vpa_debugfs_init(void) | |
2015 | { | |
2016 | char name[16]; | |
2017 | long i; | |
11dd34f3 | 2018 | struct dentry *vpa_dir; |
c6c26fb5 AP |
2019 | |
2020 | if (!firmware_has_feature(FW_FEATURE_SPLPAR)) | |
2021 | return 0; | |
2022 | ||
dbf77fed | 2023 | vpa_dir = debugfs_create_dir("vpa", arch_debugfs_dir); |
c6c26fb5 AP |
2024 | |
2025 | /* set up the per-cpu vpa file*/ | |
2026 | for_each_possible_cpu(i) { | |
c6c26fb5 | 2027 | sprintf(name, "cpu-%ld", i); |
ff229319 | 2028 | debugfs_create_file(name, 0400, vpa_dir, (void *)i, &vpa_fops); |
c6c26fb5 AP |
2029 | } |
2030 | ||
2031 | return 0; | |
2032 | } | |
2033 | machine_arch_initcall(pseries, vpa_debugfs_init); | |
2034 | #endif /* CONFIG_DEBUG_FS */ |