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[deliverable/linux.git] / arch / powerpc / platforms / pseries / lpar.c
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 <asm/processor.h>
30 #include <asm/mmu.h>
31 #include <asm/page.h>
32 #include <asm/pgtable.h>
33 #include <asm/machdep.h>
34 #include <asm/mmu_context.h>
35 #include <asm/iommu.h>
36 #include <asm/tlbflush.h>
37 #include <asm/tlb.h>
38 #include <asm/prom.h>
39 #include <asm/cputable.h>
40 #include <asm/udbg.h>
41 #include <asm/smp.h>
42 #include <asm/trace.h>
43 #include <asm/firmware.h>
44
45 #include "plpar_wrappers.h"
46 #include "pseries.h"
47
48 /* Flag bits for H_BULK_REMOVE */
49 #define HBR_REQUEST 0x4000000000000000UL
50 #define HBR_RESPONSE 0x8000000000000000UL
51 #define HBR_END 0xc000000000000000UL
52 #define HBR_AVPN 0x0200000000000000UL
53 #define HBR_ANDCOND 0x0100000000000000UL
54
55
56 /* in hvCall.S */
57 EXPORT_SYMBOL(plpar_hcall);
58 EXPORT_SYMBOL(plpar_hcall9);
59 EXPORT_SYMBOL(plpar_hcall_norets);
60
61 extern void pSeries_find_serial_port(void);
62
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 if (cpu_has_feature(CPU_FTR_ALTIVEC))
72 lppaca_of(cpu).vmxregs_in_use = 1;
73
74 if (cpu_has_feature(CPU_FTR_ARCH_207S))
75 lppaca_of(cpu).ebb_regs_in_use = 1;
76
77 addr = __pa(&lppaca_of(cpu));
78 ret = register_vpa(hwcpu, addr);
79
80 if (ret) {
81 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
82 "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
83 return;
84 }
85 /*
86 * PAPR says this feature is SLB-Buffer but firmware never
87 * reports that. All SPLPAR support SLB shadow buffer.
88 */
89 addr = __pa(&slb_shadow[cpu]);
90 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
91 ret = register_slb_shadow(hwcpu, addr);
92 if (ret)
93 pr_err("WARNING: SLB shadow buffer registration for "
94 "cpu %d (hw %d) of area %lx failed with %ld\n",
95 cpu, hwcpu, addr, ret);
96 }
97
98 /*
99 * Register dispatch trace log, if one has been allocated.
100 */
101 pp = &paca[cpu];
102 dtl = pp->dispatch_log;
103 if (dtl) {
104 pp->dtl_ridx = 0;
105 pp->dtl_curr = dtl;
106 lppaca_of(cpu).dtl_idx = 0;
107
108 /* hypervisor reads buffer length from this field */
109 dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
110 ret = register_dtl(hwcpu, __pa(dtl));
111 if (ret)
112 pr_err("WARNING: DTL registration of cpu %d (hw %d) "
113 "failed with %ld\n", smp_processor_id(),
114 hwcpu, ret);
115 lppaca_of(cpu).dtl_enable_mask = 2;
116 }
117 }
118
119 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
120 unsigned long vpn, unsigned long pa,
121 unsigned long rflags, unsigned long vflags,
122 int psize, int apsize, int ssize)
123 {
124 unsigned long lpar_rc;
125 unsigned long flags;
126 unsigned long slot;
127 unsigned long hpte_v, hpte_r;
128
129 if (!(vflags & HPTE_V_BOLTED))
130 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
131 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
132 hpte_group, vpn, pa, rflags, vflags, psize);
133
134 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
135 hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
136
137 if (!(vflags & HPTE_V_BOLTED))
138 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
139
140 /* Now fill in the actual HPTE */
141 /* Set CEC cookie to 0 */
142 /* Zero page = 0 */
143 /* I-cache Invalidate = 0 */
144 /* I-cache synchronize = 0 */
145 /* Exact = 0 */
146 flags = 0;
147
148 /* Make pHyp happy */
149 if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU))
150 hpte_r &= ~_PAGE_COHERENT;
151 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
152 flags |= H_COALESCE_CAND;
153
154 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
155 if (unlikely(lpar_rc == H_PTEG_FULL)) {
156 if (!(vflags & HPTE_V_BOLTED))
157 pr_devel(" full\n");
158 return -1;
159 }
160
161 /*
162 * Since we try and ioremap PHBs we don't own, the pte insert
163 * will fail. However we must catch the failure in hash_page
164 * or we will loop forever, so return -2 in this case.
165 */
166 if (unlikely(lpar_rc != H_SUCCESS)) {
167 if (!(vflags & HPTE_V_BOLTED))
168 pr_devel(" lpar err %ld\n", lpar_rc);
169 return -2;
170 }
171 if (!(vflags & HPTE_V_BOLTED))
172 pr_devel(" -> slot: %lu\n", slot & 7);
173
174 /* Because of iSeries, we have to pass down the secondary
175 * bucket bit here as well
176 */
177 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
178 }
179
180 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
181
182 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
183 {
184 unsigned long slot_offset;
185 unsigned long lpar_rc;
186 int i;
187 unsigned long dummy1, dummy2;
188
189 /* pick a random slot to start at */
190 slot_offset = mftb() & 0x7;
191
192 for (i = 0; i < HPTES_PER_GROUP; i++) {
193
194 /* don't remove a bolted entry */
195 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
196 (0x1UL << 4), &dummy1, &dummy2);
197 if (lpar_rc == H_SUCCESS)
198 return i;
199
200 /*
201 * The test for adjunct partition is performed before the
202 * ANDCOND test. H_RESOURCE may be returned, so we need to
203 * check for that as well.
204 */
205 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
206
207 slot_offset++;
208 slot_offset &= 0x7;
209 }
210
211 return -1;
212 }
213
214 static void pSeries_lpar_hptab_clear(void)
215 {
216 unsigned long size_bytes = 1UL << ppc64_pft_size;
217 unsigned long hpte_count = size_bytes >> 4;
218 struct {
219 unsigned long pteh;
220 unsigned long ptel;
221 } ptes[4];
222 long lpar_rc;
223 unsigned long i, j;
224
225 /* Read in batches of 4,
226 * invalidate only valid entries not in the VRMA
227 * hpte_count will be a multiple of 4
228 */
229 for (i = 0; i < hpte_count; i += 4) {
230 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
231 if (lpar_rc != H_SUCCESS)
232 continue;
233 for (j = 0; j < 4; j++){
234 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
235 HPTE_V_VRMA_MASK)
236 continue;
237 if (ptes[j].pteh & HPTE_V_VALID)
238 plpar_pte_remove_raw(0, i + j, 0,
239 &(ptes[j].pteh), &(ptes[j].ptel));
240 }
241 }
242 }
243
244 /*
245 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
246 * the low 3 bits of flags happen to line up. So no transform is needed.
247 * We can probably optimize here and assume the high bits of newpp are
248 * already zero. For now I am paranoid.
249 */
250 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
251 unsigned long newpp,
252 unsigned long vpn,
253 int psize, int apsize,
254 int ssize, int local)
255 {
256 unsigned long lpar_rc;
257 unsigned long flags = (newpp & 7) | H_AVPN;
258 unsigned long want_v;
259
260 want_v = hpte_encode_avpn(vpn, psize, ssize);
261
262 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
263 want_v, slot, flags, psize);
264
265 lpar_rc = plpar_pte_protect(flags, slot, want_v);
266
267 if (lpar_rc == H_NOT_FOUND) {
268 pr_devel("not found !\n");
269 return -1;
270 }
271
272 pr_devel("ok\n");
273
274 BUG_ON(lpar_rc != H_SUCCESS);
275
276 return 0;
277 }
278
279 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
280 {
281 unsigned long dword0;
282 unsigned long lpar_rc;
283 unsigned long dummy_word1;
284 unsigned long flags;
285
286 /* Read 1 pte at a time */
287 /* Do not need RPN to logical page translation */
288 /* No cross CEC PFT access */
289 flags = 0;
290
291 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
292
293 BUG_ON(lpar_rc != H_SUCCESS);
294
295 return dword0;
296 }
297
298 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
299 {
300 unsigned long hash;
301 unsigned long i;
302 long slot;
303 unsigned long want_v, hpte_v;
304
305 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
306 want_v = hpte_encode_avpn(vpn, psize, ssize);
307
308 /* Bolted entries are always in the primary group */
309 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
310 for (i = 0; i < HPTES_PER_GROUP; i++) {
311 hpte_v = pSeries_lpar_hpte_getword0(slot);
312
313 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
314 /* HPTE matches */
315 return slot;
316 ++slot;
317 }
318
319 return -1;
320 }
321
322 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
323 unsigned long ea,
324 int psize, int ssize)
325 {
326 unsigned long vpn;
327 unsigned long lpar_rc, slot, vsid, flags;
328
329 vsid = get_kernel_vsid(ea, ssize);
330 vpn = hpt_vpn(ea, vsid, ssize);
331
332 slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
333 BUG_ON(slot == -1);
334
335 flags = newpp & 7;
336 lpar_rc = plpar_pte_protect(flags, slot, 0);
337
338 BUG_ON(lpar_rc != H_SUCCESS);
339 }
340
341 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
342 int psize, int apsize,
343 int ssize, int local)
344 {
345 unsigned long want_v;
346 unsigned long lpar_rc;
347 unsigned long dummy1, dummy2;
348
349 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
350 slot, vpn, psize, local);
351
352 want_v = hpte_encode_avpn(vpn, psize, ssize);
353 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
354 if (lpar_rc == H_NOT_FOUND)
355 return;
356
357 BUG_ON(lpar_rc != H_SUCCESS);
358 }
359
360 /*
361 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
362 * to make sure that we avoid bouncing the hypervisor tlbie lock.
363 */
364 #define PPC64_HUGE_HPTE_BATCH 12
365
366 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
367 unsigned long *vpn, int count,
368 int psize, int ssize)
369 {
370 unsigned long param[8];
371 int i = 0, pix = 0, rc;
372 unsigned long flags = 0;
373 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
374
375 if (lock_tlbie)
376 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
377
378 for (i = 0; i < count; i++) {
379
380 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
381 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
382 ssize, 0);
383 } else {
384 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
385 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
386 pix += 2;
387 if (pix == 8) {
388 rc = plpar_hcall9(H_BULK_REMOVE, param,
389 param[0], param[1], param[2],
390 param[3], param[4], param[5],
391 param[6], param[7]);
392 BUG_ON(rc != H_SUCCESS);
393 pix = 0;
394 }
395 }
396 }
397 if (pix) {
398 param[pix] = HBR_END;
399 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
400 param[2], param[3], param[4], param[5],
401 param[6], param[7]);
402 BUG_ON(rc != H_SUCCESS);
403 }
404
405 if (lock_tlbie)
406 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
407 }
408
409 static void pSeries_lpar_hugepage_invalidate(struct mm_struct *mm,
410 unsigned char *hpte_slot_array,
411 unsigned long addr, int psize)
412 {
413 int ssize = 0, i, index = 0;
414 unsigned long s_addr = addr;
415 unsigned int max_hpte_count, valid;
416 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
417 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
418 unsigned long shift, hidx, vpn = 0, vsid, hash, slot;
419
420 shift = mmu_psize_defs[psize].shift;
421 max_hpte_count = 1U << (PMD_SHIFT - shift);
422
423 for (i = 0; i < max_hpte_count; i++) {
424 valid = hpte_valid(hpte_slot_array, i);
425 if (!valid)
426 continue;
427 hidx = hpte_hash_index(hpte_slot_array, i);
428
429 /* get the vpn */
430 addr = s_addr + (i * (1ul << shift));
431 if (!is_kernel_addr(addr)) {
432 ssize = user_segment_size(addr);
433 vsid = get_vsid(mm->context.id, addr, ssize);
434 WARN_ON(vsid == 0);
435 } else {
436 vsid = get_kernel_vsid(addr, mmu_kernel_ssize);
437 ssize = mmu_kernel_ssize;
438 }
439
440 vpn = hpt_vpn(addr, vsid, ssize);
441 hash = hpt_hash(vpn, shift, ssize);
442 if (hidx & _PTEIDX_SECONDARY)
443 hash = ~hash;
444
445 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
446 slot += hidx & _PTEIDX_GROUP_IX;
447
448 slot_array[index] = slot;
449 vpn_array[index] = vpn;
450 if (index == PPC64_HUGE_HPTE_BATCH - 1) {
451 /*
452 * Now do a bluk invalidate
453 */
454 __pSeries_lpar_hugepage_invalidate(slot_array,
455 vpn_array,
456 PPC64_HUGE_HPTE_BATCH,
457 psize, ssize);
458 index = 0;
459 } else
460 index++;
461 }
462 if (index)
463 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
464 index, psize, ssize);
465 }
466
467 static void pSeries_lpar_hpte_removebolted(unsigned long ea,
468 int psize, int ssize)
469 {
470 unsigned long vpn;
471 unsigned long slot, vsid;
472
473 vsid = get_kernel_vsid(ea, ssize);
474 vpn = hpt_vpn(ea, vsid, ssize);
475
476 slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
477 BUG_ON(slot == -1);
478 /*
479 * lpar doesn't use the passed actual page size
480 */
481 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
482 }
483
484 /*
485 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
486 * lock.
487 */
488 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
489 {
490 unsigned long vpn;
491 unsigned long i, pix, rc;
492 unsigned long flags = 0;
493 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
494 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
495 unsigned long param[9];
496 unsigned long hash, index, shift, hidx, slot;
497 real_pte_t pte;
498 int psize, ssize;
499
500 if (lock_tlbie)
501 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
502
503 psize = batch->psize;
504 ssize = batch->ssize;
505 pix = 0;
506 for (i = 0; i < number; i++) {
507 vpn = batch->vpn[i];
508 pte = batch->pte[i];
509 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
510 hash = hpt_hash(vpn, shift, ssize);
511 hidx = __rpte_to_hidx(pte, index);
512 if (hidx & _PTEIDX_SECONDARY)
513 hash = ~hash;
514 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
515 slot += hidx & _PTEIDX_GROUP_IX;
516 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
517 /*
518 * lpar doesn't use the passed actual page size
519 */
520 pSeries_lpar_hpte_invalidate(slot, vpn, psize,
521 0, ssize, local);
522 } else {
523 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
524 param[pix+1] = hpte_encode_avpn(vpn, psize,
525 ssize);
526 pix += 2;
527 if (pix == 8) {
528 rc = plpar_hcall9(H_BULK_REMOVE, param,
529 param[0], param[1], param[2],
530 param[3], param[4], param[5],
531 param[6], param[7]);
532 BUG_ON(rc != H_SUCCESS);
533 pix = 0;
534 }
535 }
536 } pte_iterate_hashed_end();
537 }
538 if (pix) {
539 param[pix] = HBR_END;
540 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
541 param[2], param[3], param[4], param[5],
542 param[6], param[7]);
543 BUG_ON(rc != H_SUCCESS);
544 }
545
546 if (lock_tlbie)
547 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
548 }
549
550 static int __init disable_bulk_remove(char *str)
551 {
552 if (strcmp(str, "off") == 0 &&
553 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
554 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
555 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
556 }
557 return 1;
558 }
559
560 __setup("bulk_remove=", disable_bulk_remove);
561
562 void __init hpte_init_lpar(void)
563 {
564 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
565 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
566 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
567 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
568 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
569 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
570 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
571 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;
572 ppc_md.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
573 }
574
575 #ifdef CONFIG_PPC_SMLPAR
576 #define CMO_FREE_HINT_DEFAULT 1
577 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
578
579 static int __init cmo_free_hint(char *str)
580 {
581 char *parm;
582 parm = strstrip(str);
583
584 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
585 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
586 cmo_free_hint_flag = 0;
587 return 1;
588 }
589
590 cmo_free_hint_flag = 1;
591 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
592
593 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
594 return 1;
595
596 return 0;
597 }
598
599 __setup("cmo_free_hint=", cmo_free_hint);
600
601 static void pSeries_set_page_state(struct page *page, int order,
602 unsigned long state)
603 {
604 int i, j;
605 unsigned long cmo_page_sz, addr;
606
607 cmo_page_sz = cmo_get_page_size();
608 addr = __pa((unsigned long)page_address(page));
609
610 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
611 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
612 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
613 }
614 }
615
616 void arch_free_page(struct page *page, int order)
617 {
618 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
619 return;
620
621 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
622 }
623 EXPORT_SYMBOL(arch_free_page);
624
625 #endif
626
627 #ifdef CONFIG_TRACEPOINTS
628 /*
629 * We optimise our hcall path by placing hcall_tracepoint_refcount
630 * directly in the TOC so we can check if the hcall tracepoints are
631 * enabled via a single load.
632 */
633
634 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
635 extern long hcall_tracepoint_refcount;
636
637 /*
638 * Since the tracing code might execute hcalls we need to guard against
639 * recursion. One example of this are spinlocks calling H_YIELD on
640 * shared processor partitions.
641 */
642 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
643
644 void hcall_tracepoint_regfunc(void)
645 {
646 hcall_tracepoint_refcount++;
647 }
648
649 void hcall_tracepoint_unregfunc(void)
650 {
651 hcall_tracepoint_refcount--;
652 }
653
654 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
655 {
656 unsigned long flags;
657 unsigned int *depth;
658
659 /*
660 * We cannot call tracepoints inside RCU idle regions which
661 * means we must not trace H_CEDE.
662 */
663 if (opcode == H_CEDE)
664 return;
665
666 local_irq_save(flags);
667
668 depth = &__get_cpu_var(hcall_trace_depth);
669
670 if (*depth)
671 goto out;
672
673 (*depth)++;
674 preempt_disable();
675 trace_hcall_entry(opcode, args);
676 (*depth)--;
677
678 out:
679 local_irq_restore(flags);
680 }
681
682 void __trace_hcall_exit(long opcode, unsigned long retval,
683 unsigned long *retbuf)
684 {
685 unsigned long flags;
686 unsigned int *depth;
687
688 if (opcode == H_CEDE)
689 return;
690
691 local_irq_save(flags);
692
693 depth = &__get_cpu_var(hcall_trace_depth);
694
695 if (*depth)
696 goto out;
697
698 (*depth)++;
699 trace_hcall_exit(opcode, retval, retbuf);
700 preempt_enable();
701 (*depth)--;
702
703 out:
704 local_irq_restore(flags);
705 }
706 #endif
707
708 /**
709 * h_get_mpp
710 * H_GET_MPP hcall returns info in 7 parms
711 */
712 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
713 {
714 int rc;
715 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
716
717 rc = plpar_hcall9(H_GET_MPP, retbuf);
718
719 mpp_data->entitled_mem = retbuf[0];
720 mpp_data->mapped_mem = retbuf[1];
721
722 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
723 mpp_data->pool_num = retbuf[2] & 0xffff;
724
725 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
726 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
727 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffff;
728
729 mpp_data->pool_size = retbuf[4];
730 mpp_data->loan_request = retbuf[5];
731 mpp_data->backing_mem = retbuf[6];
732
733 return rc;
734 }
735 EXPORT_SYMBOL(h_get_mpp);
736
737 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
738 {
739 int rc;
740 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
741
742 rc = plpar_hcall9(H_GET_MPP_X, retbuf);
743
744 mpp_x_data->coalesced_bytes = retbuf[0];
745 mpp_x_data->pool_coalesced_bytes = retbuf[1];
746 mpp_x_data->pool_purr_cycles = retbuf[2];
747 mpp_x_data->pool_spurr_cycles = retbuf[3];
748
749 return rc;
750 }
Linux kernel - Deliverables
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