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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