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powerpc/powernv: Report size of OPAL memcons log
[linux/fpc-iii.git] / arch / powerpc / platforms / pseries / lpar.c
blob5dc1c3c6e7165bad3a404aa4b4a9940ab873f959
1 /*
2 * pSeries_lpar.c
3 * Copyright (C) 2001 Todd Inglett, IBM Corporation
4 *
5 * pSeries LPAR support.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 /* Enables debugging of low-level hash table routines - careful! */
23 #undef DEBUG
24
25 #include <linux/kernel.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/console.h>
28 #include <linux/export.h>
29 #include <linux/jump_label.h>
30 #include <asm/processor.h>
31 #include <asm/mmu.h>
32 #include <asm/page.h>
33 #include <asm/pgtable.h>
34 #include <asm/machdep.h>
35 #include <asm/mmu_context.h>
36 #include <asm/iommu.h>
37 #include <asm/tlbflush.h>
38 #include <asm/tlb.h>
39 #include <asm/prom.h>
40 #include <asm/cputable.h>
41 #include <asm/udbg.h>
42 #include <asm/smp.h>
43 #include <asm/trace.h>
44 #include <asm/firmware.h>
45 #include <asm/plpar_wrappers.h>
46 #include <asm/kexec.h>
47 #include <asm/fadump.h>
48 #include <asm/asm-prototypes.h>
49
50 #include "pseries.h"
51
52 /* Flag bits for H_BULK_REMOVE */
53 #define HBR_REQUEST 0x4000000000000000UL
54 #define HBR_RESPONSE 0x8000000000000000UL
55 #define HBR_END 0xc000000000000000UL
56 #define HBR_AVPN 0x0200000000000000UL
57 #define HBR_ANDCOND 0x0100000000000000UL
58
59
60 /* in hvCall.S */
61 EXPORT_SYMBOL(plpar_hcall);
62 EXPORT_SYMBOL(plpar_hcall9);
63 EXPORT_SYMBOL(plpar_hcall_norets);
64
65 void vpa_init(int cpu)
66 {
67 int hwcpu = get_hard_smp_processor_id(cpu);
68 unsigned long addr;
69 long ret;
70 struct paca_struct *pp;
71 struct dtl_entry *dtl;
72
73 /*
74 * The spec says it "may be problematic" if CPU x registers the VPA of
75 * CPU y. We should never do that, but wail if we ever do.
76 */
77 WARN_ON(cpu != smp_processor_id());
78
79 if (cpu_has_feature(CPU_FTR_ALTIVEC))
80 lppaca_of(cpu).vmxregs_in_use = 1;
81
82 if (cpu_has_feature(CPU_FTR_ARCH_207S))
83 lppaca_of(cpu).ebb_regs_in_use = 1;
84
85 addr = __pa(&lppaca_of(cpu));
86 ret = register_vpa(hwcpu, addr);
87
88 if (ret) {
89 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
90 "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
91 return;
92 }
93
94 #ifdef CONFIG_PPC_STD_MMU_64
95 /*
96 * PAPR says this feature is SLB-Buffer but firmware never
97 * reports that. All SPLPAR support SLB shadow buffer.
98 */
99 if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) {
100 addr = __pa(paca[cpu].slb_shadow_ptr);
101 ret = register_slb_shadow(hwcpu, addr);
102 if (ret)
103 pr_err("WARNING: SLB shadow buffer registration for "
104 "cpu %d (hw %d) of area %lx failed with %ld\n",
105 cpu, hwcpu, addr, ret);
106 }
107 #endif /* CONFIG_PPC_STD_MMU_64 */
108
109 /*
110 * Register dispatch trace log, if one has been allocated.
111 */
112 pp = &paca[cpu];
113 dtl = pp->dispatch_log;
114 if (dtl) {
115 pp->dtl_ridx = 0;
116 pp->dtl_curr = dtl;
117 lppaca_of(cpu).dtl_idx = 0;
118
119 /* hypervisor reads buffer length from this field */
120 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
121 ret = register_dtl(hwcpu, __pa(dtl));
122 if (ret)
123 pr_err("WARNING: DTL registration of cpu %d (hw %d) "
124 "failed with %ld\n", smp_processor_id(),
125 hwcpu, ret);
126 lppaca_of(cpu).dtl_enable_mask = 2;
127 }
128 }
129
130 #ifdef CONFIG_PPC_STD_MMU_64
131
132 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
133 unsigned long vpn, unsigned long pa,
134 unsigned long rflags, unsigned long vflags,
135 int psize, int apsize, int ssize)
136 {
137 unsigned long lpar_rc;
138 unsigned long flags;
139 unsigned long slot;
140 unsigned long hpte_v, hpte_r;
141
142 if (!(vflags & HPTE_V_BOLTED))
143 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
144 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
145 hpte_group, vpn, pa, rflags, vflags, psize);
146
147 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
148 hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
149
150 if (!(vflags & HPTE_V_BOLTED))
151 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
152
153 /* Now fill in the actual HPTE */
154 /* Set CEC cookie to 0 */
155 /* Zero page = 0 */
156 /* I-cache Invalidate = 0 */
157 /* I-cache synchronize = 0 */
158 /* Exact = 0 */
159 flags = 0;
160
161 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
162 flags |= H_COALESCE_CAND;
163
164 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
165 if (unlikely(lpar_rc == H_PTEG_FULL)) {
166 if (!(vflags & HPTE_V_BOLTED))
167 pr_devel(" full\n");
168 return -1;
169 }
170
171 /*
172 * Since we try and ioremap PHBs we don't own, the pte insert
173 * will fail. However we must catch the failure in hash_page
174 * or we will loop forever, so return -2 in this case.
175 */
176 if (unlikely(lpar_rc != H_SUCCESS)) {
177 if (!(vflags & HPTE_V_BOLTED))
178 pr_devel(" lpar err %ld\n", lpar_rc);
179 return -2;
180 }
181 if (!(vflags & HPTE_V_BOLTED))
182 pr_devel(" -> slot: %lu\n", slot & 7);
183
184 /* Because of iSeries, we have to pass down the secondary
185 * bucket bit here as well
186 */
187 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
188 }
189
190 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
191
192 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
193 {
194 unsigned long slot_offset;
195 unsigned long lpar_rc;
196 int i;
197 unsigned long dummy1, dummy2;
198
199 /* pick a random slot to start at */
200 slot_offset = mftb() & 0x7;
201
202 for (i = 0; i < HPTES_PER_GROUP; i++) {
203
204 /* don't remove a bolted entry */
205 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
206 (0x1UL << 4), &dummy1, &dummy2);
207 if (lpar_rc == H_SUCCESS)
208 return i;
209
210 /*
211 * The test for adjunct partition is performed before the
212 * ANDCOND test. H_RESOURCE may be returned, so we need to
213 * check for that as well.
214 */
215 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
216
217 slot_offset++;
218 slot_offset &= 0x7;
219 }
220
221 return -1;
222 }
223
224 static void manual_hpte_clear_all(void)
225 {
226 unsigned long size_bytes = 1UL << ppc64_pft_size;
227 unsigned long hpte_count = size_bytes >> 4;
228 struct {
229 unsigned long pteh;
230 unsigned long ptel;
231 } ptes[4];
232 long lpar_rc;
233 unsigned long i, j;
234
235 /* Read in batches of 4,
236 * invalidate only valid entries not in the VRMA
237 * hpte_count will be a multiple of 4
238 */
239 for (i = 0; i < hpte_count; i += 4) {
240 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
241 if (lpar_rc != H_SUCCESS)
242 continue;
243 for (j = 0; j < 4; j++){
244 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
245 HPTE_V_VRMA_MASK)
246 continue;
247 if (ptes[j].pteh & HPTE_V_VALID)
248 plpar_pte_remove_raw(0, i + j, 0,
249 &(ptes[j].pteh), &(ptes[j].ptel));
250 }
251 }
252 }
253
254 static int hcall_hpte_clear_all(void)
255 {
256 int rc;
257
258 do {
259 rc = plpar_hcall_norets(H_CLEAR_HPT);
260 } while (rc == H_CONTINUE);
261
262 return rc;
263 }
264
265 static void pseries_hpte_clear_all(void)
266 {
267 int rc;
268
269 rc = hcall_hpte_clear_all();
270 if (rc != H_SUCCESS)
271 manual_hpte_clear_all();
272
273 #ifdef __LITTLE_ENDIAN__
274 /*
275 * Reset exceptions to big endian.
276 *
277 * FIXME this is a hack for kexec, we need to reset the exception
278 * endian before starting the new kernel and this is a convenient place
279 * to do it.
280 *
281 * This is also called on boot when a fadump happens. In that case we
282 * must not change the exception endian mode.
283 */
284 if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active())
285 pseries_big_endian_exceptions();
286 #endif
287 }
288
289 /*
290 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
291 * the low 3 bits of flags happen to line up. So no transform is needed.
292 * We can probably optimize here and assume the high bits of newpp are
293 * already zero. For now I am paranoid.
294 */
295 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
296 unsigned long newpp,
297 unsigned long vpn,
298 int psize, int apsize,
299 int ssize, unsigned long inv_flags)
300 {
301 unsigned long lpar_rc;
302 unsigned long flags = (newpp & 7) | H_AVPN;
303 unsigned long want_v;
304
305 want_v = hpte_encode_avpn(vpn, psize, ssize);
306
307 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
308 want_v, slot, flags, psize);
309
310 lpar_rc = plpar_pte_protect(flags, slot, want_v);
311
312 if (lpar_rc == H_NOT_FOUND) {
313 pr_devel("not found !\n");
314 return -1;
315 }
316
317 pr_devel("ok\n");
318
319 BUG_ON(lpar_rc != H_SUCCESS);
320
321 return 0;
322 }
323
324 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group)
325 {
326 long lpar_rc;
327 unsigned long i, j;
328 struct {
329 unsigned long pteh;
330 unsigned long ptel;
331 } ptes[4];
332
333 for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
334
335 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
336 if (lpar_rc != H_SUCCESS)
337 continue;
338
339 for (j = 0; j < 4; j++) {
340 if (HPTE_V_COMPARE(ptes[j].pteh, want_v) &&
341 (ptes[j].pteh & HPTE_V_VALID))
342 return i + j;
343 }
344 }
345
346 return -1;
347 }
348
349 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
350 {
351 long slot;
352 unsigned long hash;
353 unsigned long want_v;
354 unsigned long hpte_group;
355
356 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
357 want_v = hpte_encode_avpn(vpn, psize, ssize);
358
359 /* Bolted entries are always in the primary group */
360 hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
361 slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
362 if (slot < 0)
363 return -1;
364 return hpte_group + slot;
365 }
366
367 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
368 unsigned long ea,
369 int psize, int ssize)
370 {
371 unsigned long vpn;
372 unsigned long lpar_rc, slot, vsid, flags;
373
374 vsid = get_kernel_vsid(ea, ssize);
375 vpn = hpt_vpn(ea, vsid, ssize);
376
377 slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
378 BUG_ON(slot == -1);
379
380 flags = newpp & 7;
381 lpar_rc = plpar_pte_protect(flags, slot, 0);
382
383 BUG_ON(lpar_rc != H_SUCCESS);
384 }
385
386 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
387 int psize, int apsize,
388 int ssize, int local)
389 {
390 unsigned long want_v;
391 unsigned long lpar_rc;
392 unsigned long dummy1, dummy2;
393
394 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
395 slot, vpn, psize, local);
396
397 want_v = hpte_encode_avpn(vpn, psize, ssize);
398 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
399 if (lpar_rc == H_NOT_FOUND)
400 return;
401
402 BUG_ON(lpar_rc != H_SUCCESS);
403 }
404
405 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
406 /*
407 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
408 * to make sure that we avoid bouncing the hypervisor tlbie lock.
409 */
410 #define PPC64_HUGE_HPTE_BATCH 12
411
412 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
413 unsigned long *vpn, int count,
414 int psize, int ssize)
415 {
416 unsigned long param[PLPAR_HCALL9_BUFSIZE];
417 int i = 0, pix = 0, rc;
418 unsigned long flags = 0;
419 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
420
421 if (lock_tlbie)
422 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
423
424 for (i = 0; i < count; i++) {
425
426 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
427 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
428 ssize, 0);
429 } else {
430 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
431 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
432 pix += 2;
433 if (pix == 8) {
434 rc = plpar_hcall9(H_BULK_REMOVE, param,
435 param[0], param[1], param[2],
436 param[3], param[4], param[5],
437 param[6], param[7]);
438 BUG_ON(rc != H_SUCCESS);
439 pix = 0;
440 }
441 }
442 }
443 if (pix) {
444 param[pix] = HBR_END;
445 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
446 param[2], param[3], param[4], param[5],
447 param[6], param[7]);
448 BUG_ON(rc != H_SUCCESS);
449 }
450
451 if (lock_tlbie)
452 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
453 }
454
455 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
456 unsigned long addr,
457 unsigned char *hpte_slot_array,
458 int psize, int ssize, int local)
459 {
460 int i, index = 0;
461 unsigned long s_addr = addr;
462 unsigned int max_hpte_count, valid;
463 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
464 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
465 unsigned long shift, hidx, vpn = 0, hash, slot;
466
467 shift = mmu_psize_defs[psize].shift;
468 max_hpte_count = 1U << (PMD_SHIFT - shift);
469
470 for (i = 0; i < max_hpte_count; i++) {
471 valid = hpte_valid(hpte_slot_array, i);
472 if (!valid)
473 continue;
474 hidx = hpte_hash_index(hpte_slot_array, i);
475
476 /* get the vpn */
477 addr = s_addr + (i * (1ul << shift));
478 vpn = hpt_vpn(addr, vsid, ssize);
479 hash = hpt_hash(vpn, shift, ssize);
480 if (hidx & _PTEIDX_SECONDARY)
481 hash = ~hash;
482
483 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
484 slot += hidx & _PTEIDX_GROUP_IX;
485
486 slot_array[index] = slot;
487 vpn_array[index] = vpn;
488 if (index == PPC64_HUGE_HPTE_BATCH - 1) {
489 /*
490 * Now do a bluk invalidate
491 */
492 __pSeries_lpar_hugepage_invalidate(slot_array,
493 vpn_array,
494 PPC64_HUGE_HPTE_BATCH,
495 psize, ssize);
496 index = 0;
497 } else
498 index++;
499 }
500 if (index)
501 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
502 index, psize, ssize);
503 }
504 #else
505 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
506 unsigned long addr,
507 unsigned char *hpte_slot_array,
508 int psize, int ssize, int local)
509 {
510 WARN(1, "%s called without THP support\n", __func__);
511 }
512 #endif
513
514 static int pSeries_lpar_hpte_removebolted(unsigned long ea,
515 int psize, int ssize)
516 {
517 unsigned long vpn;
518 unsigned long slot, vsid;
519
520 vsid = get_kernel_vsid(ea, ssize);
521 vpn = hpt_vpn(ea, vsid, ssize);
522
523 slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
524 if (slot == -1)
525 return -ENOENT;
526
527 /*
528 * lpar doesn't use the passed actual page size
529 */
530 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
531 return 0;
532 }
533
534 /*
535 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
536 * lock.
537 */
538 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
539 {
540 unsigned long vpn;
541 unsigned long i, pix, rc;
542 unsigned long flags = 0;
543 struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
544 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
545 unsigned long param[PLPAR_HCALL9_BUFSIZE];
546 unsigned long hash, index, shift, hidx, slot;
547 real_pte_t pte;
548 int psize, ssize;
549
550 if (lock_tlbie)
551 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
552
553 psize = batch->psize;
554 ssize = batch->ssize;
555 pix = 0;
556 for (i = 0; i < number; i++) {
557 vpn = batch->vpn[i];
558 pte = batch->pte[i];
559 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
560 hash = hpt_hash(vpn, shift, ssize);
561 hidx = __rpte_to_hidx(pte, index);
562 if (hidx & _PTEIDX_SECONDARY)
563 hash = ~hash;
564 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
565 slot += hidx & _PTEIDX_GROUP_IX;
566 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
567 /*
568 * lpar doesn't use the passed actual page size
569 */
570 pSeries_lpar_hpte_invalidate(slot, vpn, psize,
571 0, ssize, local);
572 } else {
573 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
574 param[pix+1] = hpte_encode_avpn(vpn, psize,
575 ssize);
576 pix += 2;
577 if (pix == 8) {
578 rc = plpar_hcall9(H_BULK_REMOVE, param,
579 param[0], param[1], param[2],
580 param[3], param[4], param[5],
581 param[6], param[7]);
582 BUG_ON(rc != H_SUCCESS);
583 pix = 0;
584 }
585 }
586 } pte_iterate_hashed_end();
587 }
588 if (pix) {
589 param[pix] = HBR_END;
590 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
591 param[2], param[3], param[4], param[5],
592 param[6], param[7]);
593 BUG_ON(rc != H_SUCCESS);
594 }
595
596 if (lock_tlbie)
597 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
598 }
599
600 static int __init disable_bulk_remove(char *str)
601 {
602 if (strcmp(str, "off") == 0 &&
603 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
604 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
605 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
606 }
607 return 1;
608 }
609
610 __setup("bulk_remove=", disable_bulk_remove);
611
612 void __init hpte_init_pseries(void)
613 {
614 mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate;
615 mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp;
616 mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
617 mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert;
618 mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove;
619 mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted;
620 mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range;
621 mmu_hash_ops.hpte_clear_all = pseries_hpte_clear_all;
622 mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
623 }
624
625 #ifdef CONFIG_PPC_SMLPAR
626 #define CMO_FREE_HINT_DEFAULT 1
627 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
628
629 static int __init cmo_free_hint(char *str)
630 {
631 char *parm;
632 parm = strstrip(str);
633
634 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
635 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
636 cmo_free_hint_flag = 0;
637 return 1;
638 }
639
640 cmo_free_hint_flag = 1;
641 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
642
643 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
644 return 1;
645
646 return 0;
647 }
648
649 __setup("cmo_free_hint=", cmo_free_hint);
650
651 static void pSeries_set_page_state(struct page *page, int order,
652 unsigned long state)
653 {
654 int i, j;
655 unsigned long cmo_page_sz, addr;
656
657 cmo_page_sz = cmo_get_page_size();
658 addr = __pa((unsigned long)page_address(page));
659
660 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
661 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
662 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
663 }
664 }
665
666 void arch_free_page(struct page *page, int order)
667 {
668 if (radix_enabled())
669 return;
670 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
671 return;
672
673 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
674 }
675 EXPORT_SYMBOL(arch_free_page);
676
677 #endif /* CONFIG_PPC_SMLPAR */
678 #endif /* CONFIG_PPC_STD_MMU_64 */
679
680 #ifdef CONFIG_TRACEPOINTS
681 #ifdef HAVE_JUMP_LABEL
682 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;
683
684 int hcall_tracepoint_regfunc(void)
685 {
686 static_key_slow_inc(&hcall_tracepoint_key);
687 return 0;
688 }
689
690 void hcall_tracepoint_unregfunc(void)
691 {
692 static_key_slow_dec(&hcall_tracepoint_key);
693 }
694 #else
695 /*
696 * We optimise our hcall path by placing hcall_tracepoint_refcount
697 * directly in the TOC so we can check if the hcall tracepoints are
698 * enabled via a single load.
699 */
700
701 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
702 extern long hcall_tracepoint_refcount;
703
704 int hcall_tracepoint_regfunc(void)
705 {
706 hcall_tracepoint_refcount++;
707 return 0;
708 }
709
710 void hcall_tracepoint_unregfunc(void)
711 {
712 hcall_tracepoint_refcount--;
713 }
714 #endif
715
716 /*
717 * Since the tracing code might execute hcalls we need to guard against
718 * recursion. One example of this are spinlocks calling H_YIELD on
719 * shared processor partitions.
720 */
721 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
722
723
724 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
725 {
726 unsigned long flags;
727 unsigned int *depth;
728
729 /*
730 * We cannot call tracepoints inside RCU idle regions which
731 * means we must not trace H_CEDE.
732 */
733 if (opcode == H_CEDE)
734 return;
735
736 local_irq_save(flags);
737
738 depth = this_cpu_ptr(&hcall_trace_depth);
739
740 if (*depth)
741 goto out;
742
743 (*depth)++;
744 preempt_disable();
745 trace_hcall_entry(opcode, args);
746 (*depth)--;
747
748 out:
749 local_irq_restore(flags);
750 }
751
752 void __trace_hcall_exit(long opcode, unsigned long retval,
753 unsigned long *retbuf)
754 {
755 unsigned long flags;
756 unsigned int *depth;
757
758 if (opcode == H_CEDE)
759 return;
760
761 local_irq_save(flags);
762
763 depth = this_cpu_ptr(&hcall_trace_depth);
764
765 if (*depth)
766 goto out;
767
768 (*depth)++;
769 trace_hcall_exit(opcode, retval, retbuf);
770 preempt_enable();
771 (*depth)--;
772
773 out:
774 local_irq_restore(flags);
775 }
776 #endif
777
778 /**
779 * h_get_mpp
780 * H_GET_MPP hcall returns info in 7 parms
781 */
782 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
783 {
784 int rc;
785 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
786
787 rc = plpar_hcall9(H_GET_MPP, retbuf);
788
789 mpp_data->entitled_mem = retbuf[0];
790 mpp_data->mapped_mem = retbuf[1];
791
792 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
793 mpp_data->pool_num = retbuf[2] & 0xffff;
794
795 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
796 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
797 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;
798
799 mpp_data->pool_size = retbuf[4];
800 mpp_data->loan_request = retbuf[5];
801 mpp_data->backing_mem = retbuf[6];
802
803 return rc;
804 }
805 EXPORT_SYMBOL(h_get_mpp);
806
807 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
808 {
809 int rc;
810 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
811
812 rc = plpar_hcall9(H_GET_MPP_X, retbuf);
813
814 mpp_x_data->coalesced_bytes = retbuf[0];
815 mpp_x_data->pool_coalesced_bytes = retbuf[1];
816 mpp_x_data->pool_purr_cycles = retbuf[2];
817 mpp_x_data->pool_spurr_cycles = retbuf[3];
818
819 return rc;
820 }
Linux with added FPC-III support