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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/jump_label.h>
30 #include <asm/processor.h>
31 #include <asm/mmu.h>
32 #include <asm/page.h>
33 #include <asm/pgtable.h>
34 #include <asm/machdep.h>
35 #include <asm/mmu_context.h>
36 #include <asm/iommu.h>
37 #include <asm/tlbflush.h>
38 #include <asm/tlb.h>
39 #include <asm/prom.h>
40 #include <asm/cputable.h>
41 #include <asm/udbg.h>
42 #include <asm/smp.h>
43 #include <asm/trace.h>
44 #include <asm/firmware.h>
45 #include <asm/plpar_wrappers.h>
46 #include <asm/kexec.h>
47 #include <asm/fadump.h>
48 #include <asm/asm-prototypes.h>
49 
50 #include "pseries.h"
51 
52 /* Flag bits for H_BULK_REMOVE */
53 #define HBR_REQUEST	0x4000000000000000UL
54 #define HBR_RESPONSE	0x8000000000000000UL
55 #define HBR_END		0xc000000000000000UL
56 #define HBR_AVPN	0x0200000000000000UL
57 #define HBR_ANDCOND	0x0100000000000000UL
58 
59 
60 /* in hvCall.S */
61 EXPORT_SYMBOL(plpar_hcall);
62 EXPORT_SYMBOL(plpar_hcall9);
63 EXPORT_SYMBOL(plpar_hcall_norets);
64 
vpa_init(int cpu)65 void vpa_init(int cpu)
66 {
67 	int hwcpu = get_hard_smp_processor_id(cpu);
68 	unsigned long addr;
69 	long ret;
70 	struct paca_struct *pp;
71 	struct dtl_entry *dtl;
72 
73 	/*
74 	 * The spec says it "may be problematic" if CPU x registers the VPA of
75 	 * CPU y. We should never do that, but wail if we ever do.
76 	 */
77 	WARN_ON(cpu != smp_processor_id());
78 
79 	if (cpu_has_feature(CPU_FTR_ALTIVEC))
80 		lppaca_of(cpu).vmxregs_in_use = 1;
81 
82 	if (cpu_has_feature(CPU_FTR_ARCH_207S))
83 		lppaca_of(cpu).ebb_regs_in_use = 1;
84 
85 	addr = __pa(&lppaca_of(cpu));
86 	ret = register_vpa(hwcpu, addr);
87 
88 	if (ret) {
89 		pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
90 		       "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
91 		return;
92 	}
93 
94 #ifdef CONFIG_PPC_STD_MMU_64
95 	/*
96 	 * PAPR says this feature is SLB-Buffer but firmware never
97 	 * reports that.  All SPLPAR support SLB shadow buffer.
98 	 */
99 	if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) {
100 		addr = __pa(paca[cpu].slb_shadow_ptr);
101 		ret = register_slb_shadow(hwcpu, addr);
102 		if (ret)
103 			pr_err("WARNING: SLB shadow buffer registration for "
104 			       "cpu %d (hw %d) of area %lx failed with %ld\n",
105 			       cpu, hwcpu, addr, ret);
106 	}
107 #endif /* CONFIG_PPC_STD_MMU_64 */
108 
109 	/*
110 	 * Register dispatch trace log, if one has been allocated.
111 	 */
112 	pp = &paca[cpu];
113 	dtl = pp->dispatch_log;
114 	if (dtl) {
115 		pp->dtl_ridx = 0;
116 		pp->dtl_curr = dtl;
117 		lppaca_of(cpu).dtl_idx = 0;
118 
119 		/* hypervisor reads buffer length from this field */
120 		dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
121 		ret = register_dtl(hwcpu, __pa(dtl));
122 		if (ret)
123 			pr_err("WARNING: DTL registration of cpu %d (hw %d) "
124 			       "failed with %ld\n", smp_processor_id(),
125 			       hwcpu, ret);
126 		lppaca_of(cpu).dtl_enable_mask = 2;
127 	}
128 }
129 
130 #ifdef CONFIG_PPC_STD_MMU_64
131 
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)132 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
133 				     unsigned long vpn, unsigned long pa,
134 				     unsigned long rflags, unsigned long vflags,
135 				     int psize, int apsize, int ssize)
136 {
137 	unsigned long lpar_rc;
138 	unsigned long flags;
139 	unsigned long slot;
140 	unsigned long hpte_v, hpte_r;
141 
142 	if (!(vflags & HPTE_V_BOLTED))
143 		pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
144 			 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
145 			 hpte_group, vpn,  pa, rflags, vflags, psize);
146 
147 	hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
148 	hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
149 
150 	if (!(vflags & HPTE_V_BOLTED))
151 		pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
152 
153 	/* Now fill in the actual HPTE */
154 	/* Set CEC cookie to 0         */
155 	/* Zero page = 0               */
156 	/* I-cache Invalidate = 0      */
157 	/* I-cache synchronize = 0     */
158 	/* Exact = 0                   */
159 	flags = 0;
160 
161 	if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
162 		flags |= H_COALESCE_CAND;
163 
164 	lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
165 	if (unlikely(lpar_rc == H_PTEG_FULL)) {
166 		if (!(vflags & HPTE_V_BOLTED))
167 			pr_devel(" full\n");
168 		return -1;
169 	}
170 
171 	/*
172 	 * Since we try and ioremap PHBs we don't own, the pte insert
173 	 * will fail. However we must catch the failure in hash_page
174 	 * or we will loop forever, so return -2 in this case.
175 	 */
176 	if (unlikely(lpar_rc != H_SUCCESS)) {
177 		if (!(vflags & HPTE_V_BOLTED))
178 			pr_devel(" lpar err %ld\n", lpar_rc);
179 		return -2;
180 	}
181 	if (!(vflags & HPTE_V_BOLTED))
182 		pr_devel(" -> slot: %lu\n", slot & 7);
183 
184 	/* Because of iSeries, we have to pass down the secondary
185 	 * bucket bit here as well
186 	 */
187 	return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
188 }
189 
190 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
191 
pSeries_lpar_hpte_remove(unsigned long hpte_group)192 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
193 {
194 	unsigned long slot_offset;
195 	unsigned long lpar_rc;
196 	int i;
197 	unsigned long dummy1, dummy2;
198 
199 	/* pick a random slot to start at */
200 	slot_offset = mftb() & 0x7;
201 
202 	for (i = 0; i < HPTES_PER_GROUP; i++) {
203 
204 		/* don't remove a bolted entry */
205 		lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
206 					   (0x1UL << 4), &dummy1, &dummy2);
207 		if (lpar_rc == H_SUCCESS)
208 			return i;
209 
210 		/*
211 		 * The test for adjunct partition is performed before the
212 		 * ANDCOND test.  H_RESOURCE may be returned, so we need to
213 		 * check for that as well.
214 		 */
215 		BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
216 
217 		slot_offset++;
218 		slot_offset &= 0x7;
219 	}
220 
221 	return -1;
222 }
223 
pSeries_lpar_hptab_clear(void)224 static void pSeries_lpar_hptab_clear(void)
225 {
226 	unsigned long size_bytes = 1UL << ppc64_pft_size;
227 	unsigned long hpte_count = size_bytes >> 4;
228 	struct {
229 		unsigned long pteh;
230 		unsigned long ptel;
231 	} ptes[4];
232 	long lpar_rc;
233 	unsigned long i, j;
234 
235 	/* Read in batches of 4,
236 	 * invalidate only valid entries not in the VRMA
237 	 * hpte_count will be a multiple of 4
238          */
239 	for (i = 0; i < hpte_count; i += 4) {
240 		lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
241 		if (lpar_rc != H_SUCCESS)
242 			continue;
243 		for (j = 0; j < 4; j++){
244 			if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
245 				HPTE_V_VRMA_MASK)
246 				continue;
247 			if (ptes[j].pteh & HPTE_V_VALID)
248 				plpar_pte_remove_raw(0, i + j, 0,
249 					&(ptes[j].pteh), &(ptes[j].ptel));
250 		}
251 	}
252 
253 #ifdef __LITTLE_ENDIAN__
254 	/*
255 	 * Reset exceptions to big endian.
256 	 *
257 	 * FIXME this is a hack for kexec, we need to reset the exception
258 	 * endian before starting the new kernel and this is a convenient place
259 	 * to do it.
260 	 *
261 	 * This is also called on boot when a fadump happens. In that case we
262 	 * must not change the exception endian mode.
263 	 */
264 	if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active())
265 		pseries_big_endian_exceptions();
266 #endif
267 }
268 
269 /*
270  * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
271  * the low 3 bits of flags happen to line up.  So no transform is needed.
272  * We can probably optimize here and assume the high bits of newpp are
273  * already zero.  For now I am paranoid.
274  */
pSeries_lpar_hpte_updatepp(unsigned long slot,unsigned long newpp,unsigned long vpn,int psize,int apsize,int ssize,unsigned long inv_flags)275 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
276 				       unsigned long newpp,
277 				       unsigned long vpn,
278 				       int psize, int apsize,
279 				       int ssize, unsigned long inv_flags)
280 {
281 	unsigned long lpar_rc;
282 	unsigned long flags;
283 	unsigned long want_v;
284 
285 	want_v = hpte_encode_avpn(vpn, psize, ssize);
286 
287 	pr_devel("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
288 		 want_v, slot, flags, psize);
289 
290 	flags = (newpp & 7) | H_AVPN;
291 	if (mmu_has_feature(MMU_FTR_KERNEL_RO))
292 		/* Move pp0 into bit 8 (IBM 55) */
293 		flags |= (newpp & HPTE_R_PP0) >> 55;
294 
295 	lpar_rc = plpar_pte_protect(flags, slot, want_v);
296 
297 	if (lpar_rc == H_NOT_FOUND) {
298 		pr_devel("not found !\n");
299 		return -1;
300 	}
301 
302 	pr_devel("ok\n");
303 
304 	BUG_ON(lpar_rc != H_SUCCESS);
305 
306 	return 0;
307 }
308 
__pSeries_lpar_hpte_find(unsigned long want_v,unsigned long hpte_group)309 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group)
310 {
311 	long lpar_rc;
312 	unsigned long i, j;
313 	struct {
314 		unsigned long pteh;
315 		unsigned long ptel;
316 	} ptes[4];
317 
318 	for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
319 
320 		lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
321 		if (lpar_rc != H_SUCCESS)
322 			continue;
323 
324 		for (j = 0; j < 4; j++) {
325 			if (HPTE_V_COMPARE(ptes[j].pteh, want_v) &&
326 			    (ptes[j].pteh & HPTE_V_VALID))
327 				return i + j;
328 		}
329 	}
330 
331 	return -1;
332 }
333 
pSeries_lpar_hpte_find(unsigned long vpn,int psize,int ssize)334 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
335 {
336 	long slot;
337 	unsigned long hash;
338 	unsigned long want_v;
339 	unsigned long hpte_group;
340 
341 	hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
342 	want_v = hpte_encode_avpn(vpn, psize, ssize);
343 
344 	/* Bolted entries are always in the primary group */
345 	hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
346 	slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
347 	if (slot < 0)
348 		return -1;
349 	return hpte_group + slot;
350 }
351 
pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,unsigned long ea,int psize,int ssize)352 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
353 					     unsigned long ea,
354 					     int psize, int ssize)
355 {
356 	unsigned long vpn;
357 	unsigned long lpar_rc, slot, vsid, flags;
358 
359 	vsid = get_kernel_vsid(ea, ssize);
360 	vpn = hpt_vpn(ea, vsid, ssize);
361 
362 	slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
363 	BUG_ON(slot == -1);
364 
365 	flags = newpp & 7;
366 	if (mmu_has_feature(MMU_FTR_KERNEL_RO))
367 		/* Move pp0 into bit 8 (IBM 55) */
368 		flags |= (newpp & HPTE_R_PP0) >> 55;
369 
370 	lpar_rc = plpar_pte_protect(flags, slot, 0);
371 
372 	BUG_ON(lpar_rc != H_SUCCESS);
373 }
374 
pSeries_lpar_hpte_invalidate(unsigned long slot,unsigned long vpn,int psize,int apsize,int ssize,int local)375 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
376 					 int psize, int apsize,
377 					 int ssize, int local)
378 {
379 	unsigned long want_v;
380 	unsigned long lpar_rc;
381 	unsigned long dummy1, dummy2;
382 
383 	pr_devel("    inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
384 		 slot, vpn, psize, local);
385 
386 	want_v = hpte_encode_avpn(vpn, psize, ssize);
387 	lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
388 	if (lpar_rc == H_NOT_FOUND)
389 		return;
390 
391 	BUG_ON(lpar_rc != H_SUCCESS);
392 }
393 
394 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
395 /*
396  * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
397  * to make sure that we avoid bouncing the hypervisor tlbie lock.
398  */
399 #define PPC64_HUGE_HPTE_BATCH 12
400 
__pSeries_lpar_hugepage_invalidate(unsigned long * slot,unsigned long * vpn,int count,int psize,int ssize)401 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
402 					     unsigned long *vpn, int count,
403 					     int psize, int ssize)
404 {
405 	unsigned long param[PLPAR_HCALL9_BUFSIZE];
406 	int i = 0, pix = 0, rc;
407 	unsigned long flags = 0;
408 	int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
409 
410 	if (lock_tlbie)
411 		spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
412 
413 	for (i = 0; i < count; i++) {
414 
415 		if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
416 			pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
417 						     ssize, 0);
418 		} else {
419 			param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
420 			param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
421 			pix += 2;
422 			if (pix == 8) {
423 				rc = plpar_hcall9(H_BULK_REMOVE, param,
424 						  param[0], param[1], param[2],
425 						  param[3], param[4], param[5],
426 						  param[6], param[7]);
427 				BUG_ON(rc != H_SUCCESS);
428 				pix = 0;
429 			}
430 		}
431 	}
432 	if (pix) {
433 		param[pix] = HBR_END;
434 		rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
435 				  param[2], param[3], param[4], param[5],
436 				  param[6], param[7]);
437 		BUG_ON(rc != H_SUCCESS);
438 	}
439 
440 	if (lock_tlbie)
441 		spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
442 }
443 
pSeries_lpar_hugepage_invalidate(unsigned long vsid,unsigned long addr,unsigned char * hpte_slot_array,int psize,int ssize,int local)444 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
445 					     unsigned long addr,
446 					     unsigned char *hpte_slot_array,
447 					     int psize, int ssize, int local)
448 {
449 	int i, index = 0;
450 	unsigned long s_addr = addr;
451 	unsigned int max_hpte_count, valid;
452 	unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
453 	unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
454 	unsigned long shift, hidx, vpn = 0, hash, slot;
455 
456 	shift = mmu_psize_defs[psize].shift;
457 	max_hpte_count = 1U << (PMD_SHIFT - shift);
458 
459 	for (i = 0; i < max_hpte_count; i++) {
460 		valid = hpte_valid(hpte_slot_array, i);
461 		if (!valid)
462 			continue;
463 		hidx =  hpte_hash_index(hpte_slot_array, i);
464 
465 		/* get the vpn */
466 		addr = s_addr + (i * (1ul << shift));
467 		vpn = hpt_vpn(addr, vsid, ssize);
468 		hash = hpt_hash(vpn, shift, ssize);
469 		if (hidx & _PTEIDX_SECONDARY)
470 			hash = ~hash;
471 
472 		slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
473 		slot += hidx & _PTEIDX_GROUP_IX;
474 
475 		slot_array[index] = slot;
476 		vpn_array[index] = vpn;
477 		if (index == PPC64_HUGE_HPTE_BATCH - 1) {
478 			/*
479 			 * Now do a bluk invalidate
480 			 */
481 			__pSeries_lpar_hugepage_invalidate(slot_array,
482 							   vpn_array,
483 							   PPC64_HUGE_HPTE_BATCH,
484 							   psize, ssize);
485 			index = 0;
486 		} else
487 			index++;
488 	}
489 	if (index)
490 		__pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
491 						   index, psize, ssize);
492 }
493 #else
pSeries_lpar_hugepage_invalidate(unsigned long vsid,unsigned long addr,unsigned char * hpte_slot_array,int psize,int ssize,int local)494 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
495 					     unsigned long addr,
496 					     unsigned char *hpte_slot_array,
497 					     int psize, int ssize, int local)
498 {
499 	WARN(1, "%s called without THP support\n", __func__);
500 }
501 #endif
502 
pSeries_lpar_hpte_removebolted(unsigned long ea,int psize,int ssize)503 static int pSeries_lpar_hpte_removebolted(unsigned long ea,
504 					  int psize, int ssize)
505 {
506 	unsigned long vpn;
507 	unsigned long slot, vsid;
508 
509 	vsid = get_kernel_vsid(ea, ssize);
510 	vpn = hpt_vpn(ea, vsid, ssize);
511 
512 	slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
513 	if (slot == -1)
514 		return -ENOENT;
515 
516 	/*
517 	 * lpar doesn't use the passed actual page size
518 	 */
519 	pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
520 	return 0;
521 }
522 
523 /*
524  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
525  * lock.
526  */
pSeries_lpar_flush_hash_range(unsigned long number,int local)527 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
528 {
529 	unsigned long vpn;
530 	unsigned long i, pix, rc;
531 	unsigned long flags = 0;
532 	struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
533 	int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
534 	unsigned long param[PLPAR_HCALL9_BUFSIZE];
535 	unsigned long hash, index, shift, hidx, slot;
536 	real_pte_t pte;
537 	int psize, ssize;
538 
539 	if (lock_tlbie)
540 		spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
541 
542 	psize = batch->psize;
543 	ssize = batch->ssize;
544 	pix = 0;
545 	for (i = 0; i < number; i++) {
546 		vpn = batch->vpn[i];
547 		pte = batch->pte[i];
548 		pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
549 			hash = hpt_hash(vpn, shift, ssize);
550 			hidx = __rpte_to_hidx(pte, index);
551 			if (hidx & _PTEIDX_SECONDARY)
552 				hash = ~hash;
553 			slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
554 			slot += hidx & _PTEIDX_GROUP_IX;
555 			if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
556 				/*
557 				 * lpar doesn't use the passed actual page size
558 				 */
559 				pSeries_lpar_hpte_invalidate(slot, vpn, psize,
560 							     0, ssize, local);
561 			} else {
562 				param[pix] = HBR_REQUEST | HBR_AVPN | slot;
563 				param[pix+1] = hpte_encode_avpn(vpn, psize,
564 								ssize);
565 				pix += 2;
566 				if (pix == 8) {
567 					rc = plpar_hcall9(H_BULK_REMOVE, param,
568 						param[0], param[1], param[2],
569 						param[3], param[4], param[5],
570 						param[6], param[7]);
571 					BUG_ON(rc != H_SUCCESS);
572 					pix = 0;
573 				}
574 			}
575 		} pte_iterate_hashed_end();
576 	}
577 	if (pix) {
578 		param[pix] = HBR_END;
579 		rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
580 				  param[2], param[3], param[4], param[5],
581 				  param[6], param[7]);
582 		BUG_ON(rc != H_SUCCESS);
583 	}
584 
585 	if (lock_tlbie)
586 		spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
587 }
588 
disable_bulk_remove(char * str)589 static int __init disable_bulk_remove(char *str)
590 {
591 	if (strcmp(str, "off") == 0 &&
592 	    firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
593 			printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
594 			powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
595 	}
596 	return 1;
597 }
598 
599 __setup("bulk_remove=", disable_bulk_remove);
600 
hpte_init_pseries(void)601 void __init hpte_init_pseries(void)
602 {
603 	mmu_hash_ops.hpte_invalidate	 = pSeries_lpar_hpte_invalidate;
604 	mmu_hash_ops.hpte_updatepp	 = pSeries_lpar_hpte_updatepp;
605 	mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
606 	mmu_hash_ops.hpte_insert	 = pSeries_lpar_hpte_insert;
607 	mmu_hash_ops.hpte_remove	 = pSeries_lpar_hpte_remove;
608 	mmu_hash_ops.hpte_removebolted   = pSeries_lpar_hpte_removebolted;
609 	mmu_hash_ops.flush_hash_range	 = pSeries_lpar_flush_hash_range;
610 	mmu_hash_ops.hpte_clear_all      = pSeries_lpar_hptab_clear;
611 	mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
612 }
613 
614 #ifdef CONFIG_PPC_SMLPAR
615 #define CMO_FREE_HINT_DEFAULT 1
616 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
617 
cmo_free_hint(char * str)618 static int __init cmo_free_hint(char *str)
619 {
620 	char *parm;
621 	parm = strstrip(str);
622 
623 	if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
624 		printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
625 		cmo_free_hint_flag = 0;
626 		return 1;
627 	}
628 
629 	cmo_free_hint_flag = 1;
630 	printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
631 
632 	if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
633 		return 1;
634 
635 	return 0;
636 }
637 
638 __setup("cmo_free_hint=", cmo_free_hint);
639 
pSeries_set_page_state(struct page * page,int order,unsigned long state)640 static void pSeries_set_page_state(struct page *page, int order,
641 				   unsigned long state)
642 {
643 	int i, j;
644 	unsigned long cmo_page_sz, addr;
645 
646 	cmo_page_sz = cmo_get_page_size();
647 	addr = __pa((unsigned long)page_address(page));
648 
649 	for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
650 		for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
651 			plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
652 	}
653 }
654 
arch_free_page(struct page * page,int order)655 void arch_free_page(struct page *page, int order)
656 {
657 	if (radix_enabled())
658 		return;
659 	if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
660 		return;
661 
662 	pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
663 }
664 EXPORT_SYMBOL(arch_free_page);
665 
666 #endif /* CONFIG_PPC_SMLPAR */
667 #endif /* CONFIG_PPC_STD_MMU_64 */
668 
669 #ifdef CONFIG_TRACEPOINTS
670 #ifdef HAVE_JUMP_LABEL
671 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;
672 
hcall_tracepoint_regfunc(void)673 void hcall_tracepoint_regfunc(void)
674 {
675 	static_key_slow_inc(&hcall_tracepoint_key);
676 }
677 
hcall_tracepoint_unregfunc(void)678 void hcall_tracepoint_unregfunc(void)
679 {
680 	static_key_slow_dec(&hcall_tracepoint_key);
681 }
682 #else
683 /*
684  * We optimise our hcall path by placing hcall_tracepoint_refcount
685  * directly in the TOC so we can check if the hcall tracepoints are
686  * enabled via a single load.
687  */
688 
689 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
690 extern long hcall_tracepoint_refcount;
691 
hcall_tracepoint_regfunc(void)692 void hcall_tracepoint_regfunc(void)
693 {
694 	hcall_tracepoint_refcount++;
695 }
696 
hcall_tracepoint_unregfunc(void)697 void hcall_tracepoint_unregfunc(void)
698 {
699 	hcall_tracepoint_refcount--;
700 }
701 #endif
702 
703 /*
704  * Since the tracing code might execute hcalls we need to guard against
705  * recursion. One example of this are spinlocks calling H_YIELD on
706  * shared processor partitions.
707  */
708 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
709 
710 
__trace_hcall_entry(unsigned long opcode,unsigned long * args)711 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
712 {
713 	unsigned long flags;
714 	unsigned int *depth;
715 
716 	/*
717 	 * We cannot call tracepoints inside RCU idle regions which
718 	 * means we must not trace H_CEDE.
719 	 */
720 	if (opcode == H_CEDE)
721 		return;
722 
723 	local_irq_save(flags);
724 
725 	depth = this_cpu_ptr(&hcall_trace_depth);
726 
727 	if (*depth)
728 		goto out;
729 
730 	(*depth)++;
731 	preempt_disable();
732 	trace_hcall_entry(opcode, args);
733 	(*depth)--;
734 
735 out:
736 	local_irq_restore(flags);
737 }
738 
__trace_hcall_exit(long opcode,unsigned long retval,unsigned long * retbuf)739 void __trace_hcall_exit(long opcode, unsigned long retval,
740 			unsigned long *retbuf)
741 {
742 	unsigned long flags;
743 	unsigned int *depth;
744 
745 	if (opcode == H_CEDE)
746 		return;
747 
748 	local_irq_save(flags);
749 
750 	depth = this_cpu_ptr(&hcall_trace_depth);
751 
752 	if (*depth)
753 		goto out;
754 
755 	(*depth)++;
756 	trace_hcall_exit(opcode, retval, retbuf);
757 	preempt_enable();
758 	(*depth)--;
759 
760 out:
761 	local_irq_restore(flags);
762 }
763 #endif
764 
765 /**
766  * h_get_mpp
767  * H_GET_MPP hcall returns info in 7 parms
768  */
h_get_mpp(struct hvcall_mpp_data * mpp_data)769 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
770 {
771 	int rc;
772 	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
773 
774 	rc = plpar_hcall9(H_GET_MPP, retbuf);
775 
776 	mpp_data->entitled_mem = retbuf[0];
777 	mpp_data->mapped_mem = retbuf[1];
778 
779 	mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
780 	mpp_data->pool_num = retbuf[2] & 0xffff;
781 
782 	mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
783 	mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
784 	mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;
785 
786 	mpp_data->pool_size = retbuf[4];
787 	mpp_data->loan_request = retbuf[5];
788 	mpp_data->backing_mem = retbuf[6];
789 
790 	return rc;
791 }
792 EXPORT_SYMBOL(h_get_mpp);
793 
h_get_mpp_x(struct hvcall_mpp_x_data * mpp_x_data)794 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
795 {
796 	int rc;
797 	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
798 
799 	rc = plpar_hcall9(H_GET_MPP_X, retbuf);
800 
801 	mpp_x_data->coalesced_bytes = retbuf[0];
802 	mpp_x_data->pool_coalesced_bytes = retbuf[1];
803 	mpp_x_data->pool_purr_cycles = retbuf[2];
804 	mpp_x_data->pool_spurr_cycles = retbuf[3];
805 
806 	return rc;
807 }
808