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Linux/arch/powerpc/platforms/pseries/lpar.c

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 <linux/delay.h>
 31 #include <linux/stop_machine.h>
 32 #include <asm/processor.h>
 33 #include <asm/mmu.h>
 34 #include <asm/page.h>
 35 #include <asm/pgtable.h>
 36 #include <asm/machdep.h>
 37 #include <asm/mmu_context.h>
 38 #include <asm/iommu.h>
 39 #include <asm/tlbflush.h>
 40 #include <asm/tlb.h>
 41 #include <asm/prom.h>
 42 #include <asm/cputable.h>
 43 #include <asm/udbg.h>
 44 #include <asm/smp.h>
 45 #include <asm/trace.h>
 46 #include <asm/firmware.h>
 47 #include <asm/plpar_wrappers.h>
 48 #include <asm/kexec.h>
 49 #include <asm/fadump.h>
 50 #include <asm/asm-prototypes.h>
 51 
 52 #include "pseries.h"
 53 
 54 /* Flag bits for H_BULK_REMOVE */
 55 #define HBR_REQUEST     0x4000000000000000UL
 56 #define HBR_RESPONSE    0x8000000000000000UL
 57 #define HBR_END         0xc000000000000000UL
 58 #define HBR_AVPN        0x0200000000000000UL
 59 #define HBR_ANDCOND     0x0100000000000000UL
 60 
 61 
 62 /* in hvCall.S */
 63 EXPORT_SYMBOL(plpar_hcall);
 64 EXPORT_SYMBOL(plpar_hcall9);
 65 EXPORT_SYMBOL(plpar_hcall_norets);
 66 
 67 void vpa_init(int cpu)
 68 {
 69         int hwcpu = get_hard_smp_processor_id(cpu);
 70         unsigned long addr;
 71         long ret;
 72         struct paca_struct *pp;
 73         struct dtl_entry *dtl;
 74 
 75         /*
 76          * The spec says it "may be problematic" if CPU x registers the VPA of
 77          * CPU y. We should never do that, but wail if we ever do.
 78          */
 79         WARN_ON(cpu != smp_processor_id());
 80 
 81         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 82                 lppaca_of(cpu).vmxregs_in_use = 1;
 83 
 84         if (cpu_has_feature(CPU_FTR_ARCH_207S))
 85                 lppaca_of(cpu).ebb_regs_in_use = 1;
 86 
 87         addr = __pa(&lppaca_of(cpu));
 88         ret = register_vpa(hwcpu, addr);
 89 
 90         if (ret) {
 91                 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
 92                        "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
 93                 return;
 94         }
 95 
 96 #ifdef CONFIG_PPC_STD_MMU_64
 97         /*
 98          * PAPR says this feature is SLB-Buffer but firmware never
 99          * reports that.  All SPLPAR support SLB shadow buffer.
100          */
101         if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) {
102                 addr = __pa(paca[cpu].slb_shadow_ptr);
103                 ret = register_slb_shadow(hwcpu, addr);
104                 if (ret)
105                         pr_err("WARNING: SLB shadow buffer registration for "
106                                "cpu %d (hw %d) of area %lx failed with %ld\n",
107                                cpu, hwcpu, addr, ret);
108         }
109 #endif /* CONFIG_PPC_STD_MMU_64 */
110 
111         /*
112          * Register dispatch trace log, if one has been allocated.
113          */
114         pp = &paca[cpu];
115         dtl = pp->dispatch_log;
116         if (dtl) {
117                 pp->dtl_ridx = 0;
118                 pp->dtl_curr = dtl;
119                 lppaca_of(cpu).dtl_idx = 0;
120 
121                 /* hypervisor reads buffer length from this field */
122                 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
123                 ret = register_dtl(hwcpu, __pa(dtl));
124                 if (ret)
125                         pr_err("WARNING: DTL registration of cpu %d (hw %d) "
126                                "failed with %ld\n", smp_processor_id(),
127                                hwcpu, ret);
128                 lppaca_of(cpu).dtl_enable_mask = 2;
129         }
130 }
131 
132 #ifdef CONFIG_PPC_STD_MMU_64
133 
134 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
135                                      unsigned long vpn, unsigned long pa,
136                                      unsigned long rflags, unsigned long vflags,
137                                      int psize, int apsize, int ssize)
138 {
139         unsigned long lpar_rc;
140         unsigned long flags;
141         unsigned long slot;
142         unsigned long hpte_v, hpte_r;
143 
144         if (!(vflags & HPTE_V_BOLTED))
145                 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
146                          "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
147                          hpte_group, vpn,  pa, rflags, vflags, psize);
148 
149         hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
150         hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
151 
152         if (!(vflags & HPTE_V_BOLTED))
153                 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
154 
155         /* Now fill in the actual HPTE */
156         /* Set CEC cookie to 0         */
157         /* Zero page = 0               */
158         /* I-cache Invalidate = 0      */
159         /* I-cache synchronize = 0     */
160         /* Exact = 0                   */
161         flags = 0;
162 
163         if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
164                 flags |= H_COALESCE_CAND;
165 
166         lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
167         if (unlikely(lpar_rc == H_PTEG_FULL)) {
168                 if (!(vflags & HPTE_V_BOLTED))
169                         pr_devel(" full\n");
170                 return -1;
171         }
172 
173         /*
174          * Since we try and ioremap PHBs we don't own, the pte insert
175          * will fail. However we must catch the failure in hash_page
176          * or we will loop forever, so return -2 in this case.
177          */
178         if (unlikely(lpar_rc != H_SUCCESS)) {
179                 if (!(vflags & HPTE_V_BOLTED))
180                         pr_devel(" lpar err %ld\n", lpar_rc);
181                 return -2;
182         }
183         if (!(vflags & HPTE_V_BOLTED))
184                 pr_devel(" -> slot: %lu\n", slot & 7);
185 
186         /* Because of iSeries, we have to pass down the secondary
187          * bucket bit here as well
188          */
189         return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
190 }
191 
192 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
193 
194 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
195 {
196         unsigned long slot_offset;
197         unsigned long lpar_rc;
198         int i;
199         unsigned long dummy1, dummy2;
200 
201         /* pick a random slot to start at */
202         slot_offset = mftb() & 0x7;
203 
204         for (i = 0; i < HPTES_PER_GROUP; i++) {
205 
206                 /* don't remove a bolted entry */
207                 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
208                                            (0x1UL << 4), &dummy1, &dummy2);
209                 if (lpar_rc == H_SUCCESS)
210                         return i;
211 
212                 /*
213                  * The test for adjunct partition is performed before the
214                  * ANDCOND test.  H_RESOURCE may be returned, so we need to
215                  * check for that as well.
216                  */
217                 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
218 
219                 slot_offset++;
220                 slot_offset &= 0x7;
221         }
222 
223         return -1;
224 }
225 
226 static void manual_hpte_clear_all(void)
227 {
228         unsigned long size_bytes = 1UL << ppc64_pft_size;
229         unsigned long hpte_count = size_bytes >> 4;
230         struct {
231                 unsigned long pteh;
232                 unsigned long ptel;
233         } ptes[4];
234         long lpar_rc;
235         unsigned long i, j;
236 
237         /* Read in batches of 4,
238          * invalidate only valid entries not in the VRMA
239          * hpte_count will be a multiple of 4
240          */
241         for (i = 0; i < hpte_count; i += 4) {
242                 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
243                 if (lpar_rc != H_SUCCESS)
244                         continue;
245                 for (j = 0; j < 4; j++){
246                         if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
247                                 HPTE_V_VRMA_MASK)
248                                 continue;
249                         if (ptes[j].pteh & HPTE_V_VALID)
250                                 plpar_pte_remove_raw(0, i + j, 0,
251                                         &(ptes[j].pteh), &(ptes[j].ptel));
252                 }
253         }
254 }
255 
256 static int hcall_hpte_clear_all(void)
257 {
258         int rc;
259 
260         do {
261                 rc = plpar_hcall_norets(H_CLEAR_HPT);
262         } while (rc == H_CONTINUE);
263 
264         return rc;
265 }
266 
267 static void pseries_hpte_clear_all(void)
268 {
269         int rc;
270 
271         rc = hcall_hpte_clear_all();
272         if (rc != H_SUCCESS)
273                 manual_hpte_clear_all();
274 
275 #ifdef __LITTLE_ENDIAN__
276         /*
277          * Reset exceptions to big endian.
278          *
279          * FIXME this is a hack for kexec, we need to reset the exception
280          * endian before starting the new kernel and this is a convenient place
281          * to do it.
282          *
283          * This is also called on boot when a fadump happens. In that case we
284          * must not change the exception endian mode.
285          */
286         if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active())
287                 pseries_big_endian_exceptions();
288 #endif
289 }
290 
291 /*
292  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
293  * the low 3 bits of flags happen to line up.  So no transform is needed.
294  * We can probably optimize here and assume the high bits of newpp are
295  * already zero.  For now I am paranoid.
296  */
297 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
298                                        unsigned long newpp,
299                                        unsigned long vpn,
300                                        int psize, int apsize,
301                                        int ssize, unsigned long inv_flags)
302 {
303         unsigned long lpar_rc;
304         unsigned long flags;
305         unsigned long want_v;
306 
307         want_v = hpte_encode_avpn(vpn, psize, ssize);
308 
309         pr_devel("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
310                  want_v, slot, flags, psize);
311 
312         flags = (newpp & 7) | H_AVPN;
313         if (mmu_has_feature(MMU_FTR_KERNEL_RO))
314                 /* Move pp0 into bit 8 (IBM 55) */
315                 flags |= (newpp & HPTE_R_PP0) >> 55;
316 
317         lpar_rc = plpar_pte_protect(flags, slot, want_v);
318 
319         if (lpar_rc == H_NOT_FOUND) {
320                 pr_devel("not found !\n");
321                 return -1;
322         }
323 
324         pr_devel("ok\n");
325 
326         BUG_ON(lpar_rc != H_SUCCESS);
327 
328         return 0;
329 }
330 
331 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group)
332 {
333         long lpar_rc;
334         unsigned long i, j;
335         struct {
336                 unsigned long pteh;
337                 unsigned long ptel;
338         } ptes[4];
339 
340         for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
341 
342                 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
343                 if (lpar_rc != H_SUCCESS)
344                         continue;
345 
346                 for (j = 0; j < 4; j++) {
347                         if (HPTE_V_COMPARE(ptes[j].pteh, want_v) &&
348                             (ptes[j].pteh & HPTE_V_VALID))
349                                 return i + j;
350                 }
351         }
352 
353         return -1;
354 }
355 
356 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
357 {
358         long slot;
359         unsigned long hash;
360         unsigned long want_v;
361         unsigned long hpte_group;
362 
363         hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
364         want_v = hpte_encode_avpn(vpn, psize, ssize);
365 
366         /* Bolted entries are always in the primary group */
367         hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
368         slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
369         if (slot < 0)
370                 return -1;
371         return hpte_group + slot;
372 }
373 
374 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
375                                              unsigned long ea,
376                                              int psize, int ssize)
377 {
378         unsigned long vpn;
379         unsigned long lpar_rc, slot, vsid, flags;
380 
381         vsid = get_kernel_vsid(ea, ssize);
382         vpn = hpt_vpn(ea, vsid, ssize);
383 
384         slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
385         BUG_ON(slot == -1);
386 
387         flags = newpp & 7;
388         if (mmu_has_feature(MMU_FTR_KERNEL_RO))
389                 /* Move pp0 into bit 8 (IBM 55) */
390                 flags |= (newpp & HPTE_R_PP0) >> 55;
391 
392         lpar_rc = plpar_pte_protect(flags, slot, 0);
393 
394         BUG_ON(lpar_rc != H_SUCCESS);
395 }
396 
397 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
398                                          int psize, int apsize,
399                                          int ssize, int local)
400 {
401         unsigned long want_v;
402         unsigned long lpar_rc;
403         unsigned long dummy1, dummy2;
404 
405         pr_devel("    inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
406                  slot, vpn, psize, local);
407 
408         want_v = hpte_encode_avpn(vpn, psize, ssize);
409         lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
410         if (lpar_rc == H_NOT_FOUND)
411                 return;
412 
413         BUG_ON(lpar_rc != H_SUCCESS);
414 }
415 
416 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
417 /*
418  * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
419  * to make sure that we avoid bouncing the hypervisor tlbie lock.
420  */
421 #define PPC64_HUGE_HPTE_BATCH 12
422 
423 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
424                                              unsigned long *vpn, int count,
425                                              int psize, int ssize)
426 {
427         unsigned long param[PLPAR_HCALL9_BUFSIZE];
428         int i = 0, pix = 0, rc;
429         unsigned long flags = 0;
430         int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
431 
432         if (lock_tlbie)
433                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
434 
435         for (i = 0; i < count; i++) {
436 
437                 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
438                         pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
439                                                      ssize, 0);
440                 } else {
441                         param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
442                         param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
443                         pix += 2;
444                         if (pix == 8) {
445                                 rc = plpar_hcall9(H_BULK_REMOVE, param,
446                                                   param[0], param[1], param[2],
447                                                   param[3], param[4], param[5],
448                                                   param[6], param[7]);
449                                 BUG_ON(rc != H_SUCCESS);
450                                 pix = 0;
451                         }
452                 }
453         }
454         if (pix) {
455                 param[pix] = HBR_END;
456                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
457                                   param[2], param[3], param[4], param[5],
458                                   param[6], param[7]);
459                 BUG_ON(rc != H_SUCCESS);
460         }
461 
462         if (lock_tlbie)
463                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
464 }
465 
466 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
467                                              unsigned long addr,
468                                              unsigned char *hpte_slot_array,
469                                              int psize, int ssize, int local)
470 {
471         int i, index = 0;
472         unsigned long s_addr = addr;
473         unsigned int max_hpte_count, valid;
474         unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
475         unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
476         unsigned long shift, hidx, vpn = 0, hash, slot;
477 
478         shift = mmu_psize_defs[psize].shift;
479         max_hpte_count = 1U << (PMD_SHIFT - shift);
480 
481         for (i = 0; i < max_hpte_count; i++) {
482                 valid = hpte_valid(hpte_slot_array, i);
483                 if (!valid)
484                         continue;
485                 hidx =  hpte_hash_index(hpte_slot_array, i);
486 
487                 /* get the vpn */
488                 addr = s_addr + (i * (1ul << shift));
489                 vpn = hpt_vpn(addr, vsid, ssize);
490                 hash = hpt_hash(vpn, shift, ssize);
491                 if (hidx & _PTEIDX_SECONDARY)
492                         hash = ~hash;
493 
494                 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
495                 slot += hidx & _PTEIDX_GROUP_IX;
496 
497                 slot_array[index] = slot;
498                 vpn_array[index] = vpn;
499                 if (index == PPC64_HUGE_HPTE_BATCH - 1) {
500                         /*
501                          * Now do a bluk invalidate
502                          */
503                         __pSeries_lpar_hugepage_invalidate(slot_array,
504                                                            vpn_array,
505                                                            PPC64_HUGE_HPTE_BATCH,
506                                                            psize, ssize);
507                         index = 0;
508                 } else
509                         index++;
510         }
511         if (index)
512                 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
513                                                    index, psize, ssize);
514 }
515 #else
516 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
517                                              unsigned long addr,
518                                              unsigned char *hpte_slot_array,
519                                              int psize, int ssize, int local)
520 {
521         WARN(1, "%s called without THP support\n", __func__);
522 }
523 #endif
524 
525 static int pSeries_lpar_hpte_removebolted(unsigned long ea,
526                                           int psize, int ssize)
527 {
528         unsigned long vpn;
529         unsigned long slot, vsid;
530 
531         vsid = get_kernel_vsid(ea, ssize);
532         vpn = hpt_vpn(ea, vsid, ssize);
533 
534         slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
535         if (slot == -1)
536                 return -ENOENT;
537 
538         /*
539          * lpar doesn't use the passed actual page size
540          */
541         pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
542         return 0;
543 }
544 
545 /*
546  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
547  * lock.
548  */
549 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
550 {
551         unsigned long vpn;
552         unsigned long i, pix, rc;
553         unsigned long flags = 0;
554         struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
555         int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
556         unsigned long param[PLPAR_HCALL9_BUFSIZE];
557         unsigned long hash, index, shift, hidx, slot;
558         real_pte_t pte;
559         int psize, ssize;
560 
561         if (lock_tlbie)
562                 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
563 
564         psize = batch->psize;
565         ssize = batch->ssize;
566         pix = 0;
567         for (i = 0; i < number; i++) {
568                 vpn = batch->vpn[i];
569                 pte = batch->pte[i];
570                 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
571                         hash = hpt_hash(vpn, shift, ssize);
572                         hidx = __rpte_to_hidx(pte, index);
573                         if (hidx & _PTEIDX_SECONDARY)
574                                 hash = ~hash;
575                         slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
576                         slot += hidx & _PTEIDX_GROUP_IX;
577                         if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
578                                 /*
579                                  * lpar doesn't use the passed actual page size
580                                  */
581                                 pSeries_lpar_hpte_invalidate(slot, vpn, psize,
582                                                              0, ssize, local);
583                         } else {
584                                 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
585                                 param[pix+1] = hpte_encode_avpn(vpn, psize,
586                                                                 ssize);
587                                 pix += 2;
588                                 if (pix == 8) {
589                                         rc = plpar_hcall9(H_BULK_REMOVE, param,
590                                                 param[0], param[1], param[2],
591                                                 param[3], param[4], param[5],
592                                                 param[6], param[7]);
593                                         BUG_ON(rc != H_SUCCESS);
594                                         pix = 0;
595                                 }
596                         }
597                 } pte_iterate_hashed_end();
598         }
599         if (pix) {
600                 param[pix] = HBR_END;
601                 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
602                                   param[2], param[3], param[4], param[5],
603                                   param[6], param[7]);
604                 BUG_ON(rc != H_SUCCESS);
605         }
606 
607         if (lock_tlbie)
608                 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
609 }
610 
611 static int __init disable_bulk_remove(char *str)
612 {
613         if (strcmp(str, "off") == 0 &&
614             firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
615                         printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
616                         powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
617         }
618         return 1;
619 }
620 
621 __setup("bulk_remove=", disable_bulk_remove);
622 
623 #define HPT_RESIZE_TIMEOUT      10000 /* ms */
624 
625 struct hpt_resize_state {
626         unsigned long shift;
627         int commit_rc;
628 };
629 
630 static int pseries_lpar_resize_hpt_commit(void *data)
631 {
632         struct hpt_resize_state *state = data;
633 
634         state->commit_rc = plpar_resize_hpt_commit(0, state->shift);
635         if (state->commit_rc != H_SUCCESS)
636                 return -EIO;
637 
638         /* Hypervisor has transitioned the HTAB, update our globals */
639         ppc64_pft_size = state->shift;
640         htab_size_bytes = 1UL << ppc64_pft_size;
641         htab_hash_mask = (htab_size_bytes >> 7) - 1;
642 
643         return 0;
644 }
645 
646 /* Must be called in user context */
647 static int pseries_lpar_resize_hpt(unsigned long shift)
648 {
649         struct hpt_resize_state state = {
650                 .shift = shift,
651                 .commit_rc = H_FUNCTION,
652         };
653         unsigned int delay, total_delay = 0;
654         int rc;
655         ktime_t t0, t1, t2;
656 
657         might_sleep();
658 
659         if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE))
660                 return -ENODEV;
661 
662         printk(KERN_INFO "lpar: Attempting to resize HPT to shift %lu\n",
663                shift);
664 
665         t0 = ktime_get();
666 
667         rc = plpar_resize_hpt_prepare(0, shift);
668         while (H_IS_LONG_BUSY(rc)) {
669                 delay = get_longbusy_msecs(rc);
670                 total_delay += delay;
671                 if (total_delay > HPT_RESIZE_TIMEOUT) {
672                         /* prepare with shift==0 cancels an in-progress resize */
673                         rc = plpar_resize_hpt_prepare(0, 0);
674                         if (rc != H_SUCCESS)
675                                 printk(KERN_WARNING
676                                        "lpar: Unexpected error %d cancelling timed out HPT resize\n",
677                                        rc);
678                         return -ETIMEDOUT;
679                 }
680                 msleep(delay);
681                 rc = plpar_resize_hpt_prepare(0, shift);
682         };
683 
684         switch (rc) {
685         case H_SUCCESS:
686                 /* Continue on */
687                 break;
688 
689         case H_PARAMETER:
690                 return -EINVAL;
691         case H_RESOURCE:
692                 return -EPERM;
693         default:
694                 printk(KERN_WARNING
695                        "lpar: Unexpected error %d from H_RESIZE_HPT_PREPARE\n",
696                        rc);
697                 return -EIO;
698         }
699 
700         t1 = ktime_get();
701 
702         rc = stop_machine(pseries_lpar_resize_hpt_commit, &state, NULL);
703 
704         t2 = ktime_get();
705 
706         if (rc != 0) {
707                 switch (state.commit_rc) {
708                 case H_PTEG_FULL:
709                         printk(KERN_WARNING
710                                "lpar: Hash collision while resizing HPT\n");
711                         return -ENOSPC;
712 
713                 default:
714                         printk(KERN_WARNING
715                                "lpar: Unexpected error %d from H_RESIZE_HPT_COMMIT\n",
716                                state.commit_rc);
717                         return -EIO;
718                 };
719         }
720 
721         printk(KERN_INFO
722                "lpar: HPT resize to shift %lu complete (%lld ms / %lld ms)\n",
723                shift, (long long) ktime_ms_delta(t1, t0),
724                (long long) ktime_ms_delta(t2, t1));
725 
726         return 0;
727 }
728 
729 /* Actually only used for radix, so far */
730 static int pseries_lpar_register_process_table(unsigned long base,
731                         unsigned long page_size, unsigned long table_size)
732 {
733         long rc;
734         unsigned long flags = PROC_TABLE_NEW;
735 
736         if (radix_enabled())
737                 flags |= PROC_TABLE_RADIX | PROC_TABLE_GTSE;
738         for (;;) {
739                 rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base,
740                                         page_size, table_size);
741                 if (!H_IS_LONG_BUSY(rc))
742                         break;
743                 mdelay(get_longbusy_msecs(rc));
744         }
745         if (rc != H_SUCCESS) {
746                 pr_err("Failed to register process table (rc=%ld)\n", rc);
747                 BUG();
748         }
749         return rc;
750 }
751 
752 void __init hpte_init_pseries(void)
753 {
754         mmu_hash_ops.hpte_invalidate     = pSeries_lpar_hpte_invalidate;
755         mmu_hash_ops.hpte_updatepp       = pSeries_lpar_hpte_updatepp;
756         mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
757         mmu_hash_ops.hpte_insert         = pSeries_lpar_hpte_insert;
758         mmu_hash_ops.hpte_remove         = pSeries_lpar_hpte_remove;
759         mmu_hash_ops.hpte_removebolted   = pSeries_lpar_hpte_removebolted;
760         mmu_hash_ops.flush_hash_range    = pSeries_lpar_flush_hash_range;
761         mmu_hash_ops.hpte_clear_all      = pseries_hpte_clear_all;
762         mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
763 
764         if (firmware_has_feature(FW_FEATURE_HPT_RESIZE))
765                 mmu_hash_ops.resize_hpt = pseries_lpar_resize_hpt;
766 }
767 
768 void radix_init_pseries(void)
769 {
770         pr_info("Using radix MMU under hypervisor\n");
771         register_process_table = pseries_lpar_register_process_table;
772 }
773 
774 #ifdef CONFIG_PPC_SMLPAR
775 #define CMO_FREE_HINT_DEFAULT 1
776 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
777 
778 static int __init cmo_free_hint(char *str)
779 {
780         char *parm;
781         parm = strstrip(str);
782 
783         if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
784                 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
785                 cmo_free_hint_flag = 0;
786                 return 1;
787         }
788 
789         cmo_free_hint_flag = 1;
790         printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
791 
792         if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
793                 return 1;
794 
795         return 0;
796 }
797 
798 __setup("cmo_free_hint=", cmo_free_hint);
799 
800 static void pSeries_set_page_state(struct page *page, int order,
801                                    unsigned long state)
802 {
803         int i, j;
804         unsigned long cmo_page_sz, addr;
805 
806         cmo_page_sz = cmo_get_page_size();
807         addr = __pa((unsigned long)page_address(page));
808 
809         for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
810                 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
811                         plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
812         }
813 }
814 
815 void arch_free_page(struct page *page, int order)
816 {
817         if (radix_enabled())
818                 return;
819         if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
820                 return;
821 
822         pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
823 }
824 EXPORT_SYMBOL(arch_free_page);
825 
826 #endif /* CONFIG_PPC_SMLPAR */
827 #endif /* CONFIG_PPC_STD_MMU_64 */
828 
829 #ifdef CONFIG_TRACEPOINTS
830 #ifdef HAVE_JUMP_LABEL
831 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;
832 
833 int hcall_tracepoint_regfunc(void)
834 {
835         static_key_slow_inc(&hcall_tracepoint_key);
836         return 0;
837 }
838 
839 void hcall_tracepoint_unregfunc(void)
840 {
841         static_key_slow_dec(&hcall_tracepoint_key);
842 }
843 #else
844 /*
845  * We optimise our hcall path by placing hcall_tracepoint_refcount
846  * directly in the TOC so we can check if the hcall tracepoints are
847  * enabled via a single load.
848  */
849 
850 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
851 extern long hcall_tracepoint_refcount;
852 
853 int hcall_tracepoint_regfunc(void)
854 {
855         hcall_tracepoint_refcount++;
856         return 0;
857 }
858 
859 void hcall_tracepoint_unregfunc(void)
860 {
861         hcall_tracepoint_refcount--;
862 }
863 #endif
864 
865 /*
866  * Since the tracing code might execute hcalls we need to guard against
867  * recursion. One example of this are spinlocks calling H_YIELD on
868  * shared processor partitions.
869  */
870 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
871 
872 
873 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
874 {
875         unsigned long flags;
876         unsigned int *depth;
877 
878         /*
879          * We cannot call tracepoints inside RCU idle regions which
880          * means we must not trace H_CEDE.
881          */
882         if (opcode == H_CEDE)
883                 return;
884 
885         local_irq_save(flags);
886 
887         depth = this_cpu_ptr(&hcall_trace_depth);
888 
889         if (*depth)
890                 goto out;
891 
892         (*depth)++;
893         preempt_disable();
894         trace_hcall_entry(opcode, args);
895         (*depth)--;
896 
897 out:
898         local_irq_restore(flags);
899 }
900 
901 void __trace_hcall_exit(long opcode, unsigned long retval,
902                         unsigned long *retbuf)
903 {
904         unsigned long flags;
905         unsigned int *depth;
906 
907         if (opcode == H_CEDE)
908                 return;
909 
910         local_irq_save(flags);
911 
912         depth = this_cpu_ptr(&hcall_trace_depth);
913 
914         if (*depth)
915                 goto out;
916 
917         (*depth)++;
918         trace_hcall_exit(opcode, retval, retbuf);
919         preempt_enable();
920         (*depth)--;
921 
922 out:
923         local_irq_restore(flags);
924 }
925 #endif
926 
927 /**
928  * h_get_mpp
929  * H_GET_MPP hcall returns info in 7 parms
930  */
931 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
932 {
933         int rc;
934         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
935 
936         rc = plpar_hcall9(H_GET_MPP, retbuf);
937 
938         mpp_data->entitled_mem = retbuf[0];
939         mpp_data->mapped_mem = retbuf[1];
940 
941         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
942         mpp_data->pool_num = retbuf[2] & 0xffff;
943 
944         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
945         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
946         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;
947 
948         mpp_data->pool_size = retbuf[4];
949         mpp_data->loan_request = retbuf[5];
950         mpp_data->backing_mem = retbuf[6];
951 
952         return rc;
953 }
954 EXPORT_SYMBOL(h_get_mpp);
955 
956 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
957 {
958         int rc;
959         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
960 
961         rc = plpar_hcall9(H_GET_MPP_X, retbuf);
962 
963         mpp_x_data->coalesced_bytes = retbuf[0];
964         mpp_x_data->pool_coalesced_bytes = retbuf[1];
965         mpp_x_data->pool_purr_cycles = retbuf[2];
966         mpp_x_data->pool_spurr_cycles = retbuf[3];
967 
968         return rc;
969 }
970 
971 static unsigned long vsid_unscramble(unsigned long vsid, int ssize)
972 {
973         unsigned long protovsid;
974         unsigned long va_bits = VA_BITS;
975         unsigned long modinv, vsid_modulus;
976         unsigned long max_mod_inv, tmp_modinv;
977 
978         if (!mmu_has_feature(MMU_FTR_68_BIT_VA))
979                 va_bits = 65;
980 
981         if (ssize == MMU_SEGSIZE_256M) {
982                 modinv = VSID_MULINV_256M;
983                 vsid_modulus = ((1UL << (va_bits - SID_SHIFT)) - 1);
984         } else {
985                 modinv = VSID_MULINV_1T;
986                 vsid_modulus = ((1UL << (va_bits - SID_SHIFT_1T)) - 1);
987         }
988 
989         /*
990          * vsid outside our range.
991          */
992         if (vsid >= vsid_modulus)
993                 return 0;
994 
995         /*
996          * If modinv is the modular multiplicate inverse of (x % vsid_modulus)
997          * and vsid = (protovsid * x) % vsid_modulus, then we say:
998          *   protovsid = (vsid * modinv) % vsid_modulus
999          */
1000 
1001         /* Check if (vsid * modinv) overflow (63 bits) */
1002         max_mod_inv = 0x7fffffffffffffffull / vsid;
1003         if (modinv < max_mod_inv)
1004                 return (vsid * modinv) % vsid_modulus;
1005 
1006         tmp_modinv = modinv/max_mod_inv;
1007         modinv %= max_mod_inv;
1008 
1009         protovsid = (((vsid * max_mod_inv) % vsid_modulus) * tmp_modinv) % vsid_modulus;
1010         protovsid = (protovsid + vsid * modinv) % vsid_modulus;
1011 
1012         return protovsid;
1013 }
1014 
1015 static int __init reserve_vrma_context_id(void)
1016 {
1017         unsigned long protovsid;
1018 
1019         /*
1020          * Reserve context ids which map to reserved virtual addresses. For now
1021          * we only reserve the context id which maps to the VRMA VSID. We ignore
1022          * the addresses in "ibm,adjunct-virtual-addresses" because we don't
1023          * enable adjunct support via the "ibm,client-architecture-support"
1024          * interface.
1025          */
1026         protovsid = vsid_unscramble(VRMA_VSID, MMU_SEGSIZE_1T);
1027         hash__reserve_context_id(protovsid >> ESID_BITS_1T);
1028         return 0;
1029 }
1030 machine_device_initcall(pseries, reserve_vrma_context_id);
1031 

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