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/static_key.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/fadump.h>
47
48 #include "pseries.h"
49
50 /* Flag bits for H_BULK_REMOVE */
51 #define HBR_REQUEST 0x4000000000000000UL
52 #define HBR_RESPONSE 0x8000000000000000UL
53 #define HBR_END 0xc000000000000000UL
54 #define HBR_AVPN 0x0200000000000000UL
55 #define HBR_ANDCOND 0x0100000000000000UL
56
57
58 /* in hvCall.S */
59 EXPORT_SYMBOL(plpar_hcall);
60 EXPORT_SYMBOL(plpar_hcall9);
61 EXPORT_SYMBOL(plpar_hcall_norets);
62
vpa_init(int cpu)63 void vpa_init(int cpu)
64 {
65 int hwcpu = get_hard_smp_processor_id(cpu);
66 unsigned long addr;
67 long ret;
68 struct paca_struct *pp;
69 struct dtl_entry *dtl;
70
71 /*
72 * The spec says it "may be problematic" if CPU x registers the VPA of
73 * CPU y. We should never do that, but wail if we ever do.
74 */
75 WARN_ON(cpu != smp_processor_id());
76
77 if (cpu_has_feature(CPU_FTR_ALTIVEC))
78 lppaca_of(cpu).vmxregs_in_use = 1;
79
80 if (cpu_has_feature(CPU_FTR_ARCH_207S))
81 lppaca_of(cpu).ebb_regs_in_use = 1;
82
83 addr = __pa(&lppaca_of(cpu));
84 ret = register_vpa(hwcpu, addr);
85
86 if (ret) {
87 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
88 "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
89 return;
90 }
91 /*
92 * PAPR says this feature is SLB-Buffer but firmware never
93 * reports that. All SPLPAR support SLB shadow buffer.
94 */
95 addr = __pa(paca[cpu].slb_shadow_ptr);
96 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
97 ret = register_slb_shadow(hwcpu, addr);
98 if (ret)
99 pr_err("WARNING: SLB shadow buffer registration for "
100 "cpu %d (hw %d) of area %lx failed with %ld\n",
101 cpu, hwcpu, addr, ret);
102 }
103
104 /*
105 * Register dispatch trace log, if one has been allocated.
106 */
107 pp = &paca[cpu];
108 dtl = pp->dispatch_log;
109 if (dtl) {
110 pp->dtl_ridx = 0;
111 pp->dtl_curr = dtl;
112 lppaca_of(cpu).dtl_idx = 0;
113
114 /* hypervisor reads buffer length from this field */
115 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
116 ret = register_dtl(hwcpu, __pa(dtl));
117 if (ret)
118 pr_err("WARNING: DTL registration of cpu %d (hw %d) "
119 "failed with %ld\n", smp_processor_id(),
120 hwcpu, ret);
121 lppaca_of(cpu).dtl_enable_mask = 2;
122 }
123 }
124
pSeries_lpar_hpte_insert(unsigned long hpte_group,unsigned long vpn,unsigned long pa,unsigned long rflags,unsigned long vflags,int psize,int apsize,int ssize)125 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
126 unsigned long vpn, unsigned long pa,
127 unsigned long rflags, unsigned long vflags,
128 int psize, int apsize, int ssize)
129 {
130 unsigned long lpar_rc;
131 unsigned long flags;
132 unsigned long slot;
133 unsigned long hpte_v, hpte_r;
134
135 if (!(vflags & HPTE_V_BOLTED))
136 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
137 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
138 hpte_group, vpn, pa, rflags, vflags, psize);
139
140 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
141 hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
142
143 if (!(vflags & HPTE_V_BOLTED))
144 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
145
146 /* Now fill in the actual HPTE */
147 /* Set CEC cookie to 0 */
148 /* Zero page = 0 */
149 /* I-cache Invalidate = 0 */
150 /* I-cache synchronize = 0 */
151 /* Exact = 0 */
152 flags = 0;
153
154 /* Make pHyp happy */
155 if ((rflags & _PAGE_NO_CACHE) && !(rflags & _PAGE_WRITETHRU))
156 hpte_r &= ~HPTE_R_M;
157
158 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
159 flags |= H_COALESCE_CAND;
160
161 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
162 if (unlikely(lpar_rc == H_PTEG_FULL)) {
163 if (!(vflags & HPTE_V_BOLTED))
164 pr_devel(" full\n");
165 return -1;
166 }
167
168 /*
169 * Since we try and ioremap PHBs we don't own, the pte insert
170 * will fail. However we must catch the failure in hash_page
171 * or we will loop forever, so return -2 in this case.
172 */
173 if (unlikely(lpar_rc != H_SUCCESS)) {
174 if (!(vflags & HPTE_V_BOLTED))
175 pr_devel(" lpar err %ld\n", lpar_rc);
176 return -2;
177 }
178 if (!(vflags & HPTE_V_BOLTED))
179 pr_devel(" -> slot: %lu\n", slot & 7);
180
181 /* Because of iSeries, we have to pass down the secondary
182 * bucket bit here as well
183 */
184 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
185 }
186
187 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
188
pSeries_lpar_hpte_remove(unsigned long hpte_group)189 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
190 {
191 unsigned long slot_offset;
192 unsigned long lpar_rc;
193 int i;
194 unsigned long dummy1, dummy2;
195
196 /* pick a random slot to start at */
197 slot_offset = mftb() & 0x7;
198
199 for (i = 0; i < HPTES_PER_GROUP; i++) {
200
201 /* don't remove a bolted entry */
202 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
203 (0x1UL << 4), &dummy1, &dummy2);
204 if (lpar_rc == H_SUCCESS)
205 return i;
206
207 /*
208 * The test for adjunct partition is performed before the
209 * ANDCOND test. H_RESOURCE may be returned, so we need to
210 * check for that as well.
211 */
212 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
213
214 slot_offset++;
215 slot_offset &= 0x7;
216 }
217
218 return -1;
219 }
220
pSeries_lpar_hptab_clear(void)221 static void pSeries_lpar_hptab_clear(void)
222 {
223 unsigned long size_bytes = 1UL << ppc64_pft_size;
224 unsigned long hpte_count = size_bytes >> 4;
225 struct {
226 unsigned long pteh;
227 unsigned long ptel;
228 } ptes[4];
229 long lpar_rc;
230 unsigned long i, j;
231
232 /* Read in batches of 4,
233 * invalidate only valid entries not in the VRMA
234 * hpte_count will be a multiple of 4
235 */
236 for (i = 0; i < hpte_count; i += 4) {
237 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
238 if (lpar_rc != H_SUCCESS)
239 continue;
240 for (j = 0; j < 4; j++){
241 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
242 HPTE_V_VRMA_MASK)
243 continue;
244 if (ptes[j].pteh & HPTE_V_VALID)
245 plpar_pte_remove_raw(0, i + j, 0,
246 &(ptes[j].pteh), &(ptes[j].ptel));
247 }
248 }
249
250 #ifdef __LITTLE_ENDIAN__
251 /*
252 * Reset exceptions to big endian.
253 *
254 * FIXME this is a hack for kexec, we need to reset the exception
255 * endian before starting the new kernel and this is a convenient place
256 * to do it.
257 *
258 * This is also called on boot when a fadump happens. In that case we
259 * must not change the exception endian mode.
260 */
261 if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active()) {
262 long rc;
263
264 rc = pseries_big_endian_exceptions();
265 /*
266 * At this point it is unlikely panic() will get anything
267 * out to the user, but at least this will stop us from
268 * continuing on further and creating an even more
269 * difficult to debug situation.
270 */
271 if (rc)
272 panic("Could not enable big endian exceptions");
273 }
274 #endif
275 }
276
277 /*
278 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
279 * the low 3 bits of flags happen to line up. So no transform is needed.
280 * We can probably optimize here and assume the high bits of newpp are
281 * already zero. For now I am paranoid.
282 */
pSeries_lpar_hpte_updatepp(unsigned long slot,unsigned long newpp,unsigned long vpn,int psize,int apsize,int ssize,int local)283 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
284 unsigned long newpp,
285 unsigned long vpn,
286 int psize, int apsize,
287 int ssize, int local)
288 {
289 unsigned long lpar_rc;
290 unsigned long flags = (newpp & 7) | H_AVPN;
291 unsigned long want_v;
292
293 want_v = hpte_encode_avpn(vpn, psize, ssize);
294
295 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
296 want_v, slot, flags, psize);
297
298 lpar_rc = plpar_pte_protect(flags, slot, want_v);
299
300 if (lpar_rc == H_NOT_FOUND) {
301 pr_devel("not found !\n");
302 return -1;
303 }
304
305 pr_devel("ok\n");
306
307 BUG_ON(lpar_rc != H_SUCCESS);
308
309 return 0;
310 }
311
pSeries_lpar_hpte_getword0(unsigned long slot)312 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
313 {
314 unsigned long dword0;
315 unsigned long lpar_rc;
316 unsigned long dummy_word1;
317 unsigned long flags;
318
319 /* Read 1 pte at a time */
320 /* Do not need RPN to logical page translation */
321 /* No cross CEC PFT access */
322 flags = 0;
323
324 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
325
326 BUG_ON(lpar_rc != H_SUCCESS);
327
328 return dword0;
329 }
330
pSeries_lpar_hpte_find(unsigned long vpn,int psize,int ssize)331 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
332 {
333 unsigned long hash;
334 unsigned long i;
335 long slot;
336 unsigned long want_v, hpte_v;
337
338 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
339 want_v = hpte_encode_avpn(vpn, psize, ssize);
340
341 /* Bolted entries are always in the primary group */
342 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
343 for (i = 0; i < HPTES_PER_GROUP; i++) {
344 hpte_v = pSeries_lpar_hpte_getword0(slot);
345
346 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
347 /* HPTE matches */
348 return slot;
349 ++slot;
350 }
351
352 return -1;
353 }
354
pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,unsigned long ea,int psize,int ssize)355 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
356 unsigned long ea,
357 int psize, int ssize)
358 {
359 unsigned long vpn;
360 unsigned long lpar_rc, slot, vsid, flags;
361
362 vsid = get_kernel_vsid(ea, ssize);
363 vpn = hpt_vpn(ea, vsid, ssize);
364
365 slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
366 BUG_ON(slot == -1);
367
368 flags = newpp & 7;
369 lpar_rc = plpar_pte_protect(flags, slot, 0);
370
371 BUG_ON(lpar_rc != H_SUCCESS);
372 }
373
pSeries_lpar_hpte_invalidate(unsigned long slot,unsigned long vpn,int psize,int apsize,int ssize,int local)374 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
375 int psize, int apsize,
376 int ssize, int local)
377 {
378 unsigned long want_v;
379 unsigned long lpar_rc;
380 unsigned long dummy1, dummy2;
381
382 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
383 slot, vpn, psize, local);
384
385 want_v = hpte_encode_avpn(vpn, psize, ssize);
386 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
387 if (lpar_rc == H_NOT_FOUND)
388 return;
389
390 BUG_ON(lpar_rc != H_SUCCESS);
391 }
392
393 /*
394 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
395 * to make sure that we avoid bouncing the hypervisor tlbie lock.
396 */
397 #define PPC64_HUGE_HPTE_BATCH 12
398
__pSeries_lpar_hugepage_invalidate(unsigned long * slot,unsigned long * vpn,int count,int psize,int ssize)399 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
400 unsigned long *vpn, int count,
401 int psize, int ssize)
402 {
403 unsigned long param[8];
404 int i = 0, pix = 0, rc;
405 unsigned long flags = 0;
406 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
407
408 if (lock_tlbie)
409 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
410
411 for (i = 0; i < count; i++) {
412
413 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
414 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
415 ssize, 0);
416 } else {
417 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
418 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
419 pix += 2;
420 if (pix == 8) {
421 rc = plpar_hcall9(H_BULK_REMOVE, param,
422 param[0], param[1], param[2],
423 param[3], param[4], param[5],
424 param[6], param[7]);
425 BUG_ON(rc != H_SUCCESS);
426 pix = 0;
427 }
428 }
429 }
430 if (pix) {
431 param[pix] = HBR_END;
432 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
433 param[2], param[3], param[4], param[5],
434 param[6], param[7]);
435 BUG_ON(rc != H_SUCCESS);
436 }
437
438 if (lock_tlbie)
439 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
440 }
441
pSeries_lpar_hugepage_invalidate(unsigned long vsid,unsigned long addr,unsigned char * hpte_slot_array,int psize,int ssize)442 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
443 unsigned long addr,
444 unsigned char *hpte_slot_array,
445 int psize, int ssize)
446 {
447 int i, index = 0;
448 unsigned long s_addr = addr;
449 unsigned int max_hpte_count, valid;
450 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
451 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
452 unsigned long shift, hidx, vpn = 0, hash, slot;
453
454 shift = mmu_psize_defs[psize].shift;
455 max_hpte_count = 1U << (PMD_SHIFT - shift);
456
457 for (i = 0; i < max_hpte_count; i++) {
458 valid = hpte_valid(hpte_slot_array, i);
459 if (!valid)
460 continue;
461 hidx = hpte_hash_index(hpte_slot_array, i);
462
463 /* get the vpn */
464 addr = s_addr + (i * (1ul << shift));
465 vpn = hpt_vpn(addr, vsid, ssize);
466 hash = hpt_hash(vpn, shift, ssize);
467 if (hidx & _PTEIDX_SECONDARY)
468 hash = ~hash;
469
470 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
471 slot += hidx & _PTEIDX_GROUP_IX;
472
473 slot_array[index] = slot;
474 vpn_array[index] = vpn;
475 if (index == PPC64_HUGE_HPTE_BATCH - 1) {
476 /*
477 * Now do a bluk invalidate
478 */
479 __pSeries_lpar_hugepage_invalidate(slot_array,
480 vpn_array,
481 PPC64_HUGE_HPTE_BATCH,
482 psize, ssize);
483 index = 0;
484 } else
485 index++;
486 }
487 if (index)
488 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
489 index, psize, ssize);
490 }
491
pSeries_lpar_hpte_removebolted(unsigned long ea,int psize,int ssize)492 static void pSeries_lpar_hpte_removebolted(unsigned long ea,
493 int psize, int ssize)
494 {
495 unsigned long vpn;
496 unsigned long slot, vsid;
497
498 vsid = get_kernel_vsid(ea, ssize);
499 vpn = hpt_vpn(ea, vsid, ssize);
500
501 slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
502 BUG_ON(slot == -1);
503 /*
504 * lpar doesn't use the passed actual page size
505 */
506 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
507 }
508
509 /*
510 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
511 * lock.
512 */
pSeries_lpar_flush_hash_range(unsigned long number,int local)513 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
514 {
515 unsigned long vpn;
516 unsigned long i, pix, rc;
517 unsigned long flags = 0;
518 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
519 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
520 unsigned long param[9];
521 unsigned long hash, index, shift, hidx, slot;
522 real_pte_t pte;
523 int psize, ssize;
524
525 if (lock_tlbie)
526 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
527
528 psize = batch->psize;
529 ssize = batch->ssize;
530 pix = 0;
531 for (i = 0; i < number; i++) {
532 vpn = batch->vpn[i];
533 pte = batch->pte[i];
534 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
535 hash = hpt_hash(vpn, shift, ssize);
536 hidx = __rpte_to_hidx(pte, index);
537 if (hidx & _PTEIDX_SECONDARY)
538 hash = ~hash;
539 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
540 slot += hidx & _PTEIDX_GROUP_IX;
541 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
542 /*
543 * lpar doesn't use the passed actual page size
544 */
545 pSeries_lpar_hpte_invalidate(slot, vpn, psize,
546 0, ssize, local);
547 } else {
548 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
549 param[pix+1] = hpte_encode_avpn(vpn, psize,
550 ssize);
551 pix += 2;
552 if (pix == 8) {
553 rc = plpar_hcall9(H_BULK_REMOVE, param,
554 param[0], param[1], param[2],
555 param[3], param[4], param[5],
556 param[6], param[7]);
557 BUG_ON(rc != H_SUCCESS);
558 pix = 0;
559 }
560 }
561 } pte_iterate_hashed_end();
562 }
563 if (pix) {
564 param[pix] = HBR_END;
565 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
566 param[2], param[3], param[4], param[5],
567 param[6], param[7]);
568 BUG_ON(rc != H_SUCCESS);
569 }
570
571 if (lock_tlbie)
572 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
573 }
574
disable_bulk_remove(char * str)575 static int __init disable_bulk_remove(char *str)
576 {
577 if (strcmp(str, "off") == 0 &&
578 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
579 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
580 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
581 }
582 return 1;
583 }
584
585 __setup("bulk_remove=", disable_bulk_remove);
586
hpte_init_lpar(void)587 void __init hpte_init_lpar(void)
588 {
589 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
590 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
591 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
592 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
593 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
594 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
595 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
596 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;
597 ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
598 }
599
600 #ifdef CONFIG_PPC_SMLPAR
601 #define CMO_FREE_HINT_DEFAULT 1
602 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
603
cmo_free_hint(char * str)604 static int __init cmo_free_hint(char *str)
605 {
606 char *parm;
607 parm = strstrip(str);
608
609 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
610 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
611 cmo_free_hint_flag = 0;
612 return 1;
613 }
614
615 cmo_free_hint_flag = 1;
616 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
617
618 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
619 return 1;
620
621 return 0;
622 }
623
624 __setup("cmo_free_hint=", cmo_free_hint);
625
pSeries_set_page_state(struct page * page,int order,unsigned long state)626 static void pSeries_set_page_state(struct page *page, int order,
627 unsigned long state)
628 {
629 int i, j;
630 unsigned long cmo_page_sz, addr;
631
632 cmo_page_sz = cmo_get_page_size();
633 addr = __pa((unsigned long)page_address(page));
634
635 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
636 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
637 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
638 }
639 }
640
arch_free_page(struct page * page,int order)641 void arch_free_page(struct page *page, int order)
642 {
643 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
644 return;
645
646 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
647 }
648 EXPORT_SYMBOL(arch_free_page);
649
650 #endif
651
652 #ifdef CONFIG_TRACEPOINTS
653 #ifdef HAVE_JUMP_LABEL
654 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;
655
hcall_tracepoint_regfunc(void)656 void hcall_tracepoint_regfunc(void)
657 {
658 static_key_slow_inc(&hcall_tracepoint_key);
659 }
660
hcall_tracepoint_unregfunc(void)661 void hcall_tracepoint_unregfunc(void)
662 {
663 static_key_slow_dec(&hcall_tracepoint_key);
664 }
665 #else
666 /*
667 * We optimise our hcall path by placing hcall_tracepoint_refcount
668 * directly in the TOC so we can check if the hcall tracepoints are
669 * enabled via a single load.
670 */
671
672 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
673 extern long hcall_tracepoint_refcount;
674
hcall_tracepoint_regfunc(void)675 void hcall_tracepoint_regfunc(void)
676 {
677 hcall_tracepoint_refcount++;
678 }
679
hcall_tracepoint_unregfunc(void)680 void hcall_tracepoint_unregfunc(void)
681 {
682 hcall_tracepoint_refcount--;
683 }
684 #endif
685
686 /*
687 * Since the tracing code might execute hcalls we need to guard against
688 * recursion. One example of this are spinlocks calling H_YIELD on
689 * shared processor partitions.
690 */
691 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
692
693
__trace_hcall_entry(unsigned long opcode,unsigned long * args)694 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
695 {
696 unsigned long flags;
697 unsigned int *depth;
698
699 /*
700 * We cannot call tracepoints inside RCU idle regions which
701 * means we must not trace H_CEDE.
702 */
703 if (opcode == H_CEDE)
704 return;
705
706 local_irq_save(flags);
707
708 depth = &__get_cpu_var(hcall_trace_depth);
709
710 if (*depth)
711 goto out;
712
713 (*depth)++;
714 preempt_disable();
715 trace_hcall_entry(opcode, args);
716 (*depth)--;
717
718 out:
719 local_irq_restore(flags);
720 }
721
__trace_hcall_exit(long opcode,unsigned long retval,unsigned long * retbuf)722 void __trace_hcall_exit(long opcode, unsigned long retval,
723 unsigned long *retbuf)
724 {
725 unsigned long flags;
726 unsigned int *depth;
727
728 if (opcode == H_CEDE)
729 return;
730
731 local_irq_save(flags);
732
733 depth = &__get_cpu_var(hcall_trace_depth);
734
735 if (*depth)
736 goto out;
737
738 (*depth)++;
739 trace_hcall_exit(opcode, retval, retbuf);
740 preempt_enable();
741 (*depth)--;
742
743 out:
744 local_irq_restore(flags);
745 }
746 #endif
747
748 /**
749 * h_get_mpp
750 * H_GET_MPP hcall returns info in 7 parms
751 */
h_get_mpp(struct hvcall_mpp_data * mpp_data)752 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
753 {
754 int rc;
755 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
756
757 rc = plpar_hcall9(H_GET_MPP, retbuf);
758
759 mpp_data->entitled_mem = retbuf[0];
760 mpp_data->mapped_mem = retbuf[1];
761
762 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
763 mpp_data->pool_num = retbuf[2] & 0xffff;
764
765 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
766 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
767 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;
768
769 mpp_data->pool_size = retbuf[4];
770 mpp_data->loan_request = retbuf[5];
771 mpp_data->backing_mem = retbuf[6];
772
773 return rc;
774 }
775 EXPORT_SYMBOL(h_get_mpp);
776
h_get_mpp_x(struct hvcall_mpp_x_data * mpp_x_data)777 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
778 {
779 int rc;
780 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
781
782 rc = plpar_hcall9(H_GET_MPP_X, retbuf);
783
784 mpp_x_data->coalesced_bytes = retbuf[0];
785 mpp_x_data->pool_coalesced_bytes = retbuf[1];
786 mpp_x_data->pool_purr_cycles = retbuf[2];
787 mpp_x_data->pool_spurr_cycles = retbuf[3];
788
789 return rc;
790 }
791