summaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/pseries/lpar.c
blob: e3139fa5e556e78ddcdeacc4e4850b7aeeba6ed4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
/*
 * pSeries_lpar.c
 * Copyright (C) 2001 Todd Inglett, IBM Corporation
 *
 * pSeries LPAR support.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

/* Enables debugging of low-level hash table routines - careful! */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/console.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/machdep.h>
#include <asm/abs_addr.h>
#include <asm/mmu_context.h>
#include <asm/iommu.h>
#include <asm/tlbflush.h>
#include <asm/tlb.h>
#include <asm/prom.h>
#include <asm/cputable.h>
#include <asm/udbg.h>
#include <asm/smp.h>

#include "plpar_wrappers.h"
#include "pseries.h"


/* in hvCall.S */
EXPORT_SYMBOL(plpar_hcall);
EXPORT_SYMBOL(plpar_hcall9);
EXPORT_SYMBOL(plpar_hcall_norets);

extern void pSeries_find_serial_port(void);


static int vtermno;	/* virtual terminal# for udbg  */

#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
static void udbg_hvsi_putc(char c)
{
	/* packet's seqno isn't used anyways */
	uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
	int rc;

	if (c == '\n')
		udbg_hvsi_putc('\r');

	do {
		rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
	} while (rc == H_BUSY);
}

static long hvsi_udbg_buf_len;
static uint8_t hvsi_udbg_buf[256];

static int udbg_hvsi_getc_poll(void)
{
	unsigned char ch;
	int rc, i;

	if (hvsi_udbg_buf_len == 0) {
		rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
		if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) {
			/* bad read or non-data packet */
			hvsi_udbg_buf_len = 0;
		} else {
			/* remove the packet header */
			for (i = 4; i < hvsi_udbg_buf_len; i++)
				hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
			hvsi_udbg_buf_len -= 4;
		}
	}

	if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
		/* no data ready */
		hvsi_udbg_buf_len = 0;
		return -1;
	}

	ch = hvsi_udbg_buf[0];
	/* shift remaining data down */
	for (i = 1; i < hvsi_udbg_buf_len; i++) {
		hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
	}
	hvsi_udbg_buf_len--;

	return ch;
}

static int udbg_hvsi_getc(void)
{
	int ch;
	for (;;) {
		ch = udbg_hvsi_getc_poll();
		if (ch == -1) {
			/* This shouldn't be needed...but... */
			volatile unsigned long delay;
			for (delay=0; delay < 2000000; delay++)
				;
		} else {
			return ch;
		}
	}
}

static void udbg_putcLP(char c)
{
	char buf[16];
	unsigned long rc;

	if (c == '\n')
		udbg_putcLP('\r');

	buf[0] = c;
	do {
		rc = plpar_put_term_char(vtermno, 1, buf);
	} while(rc == H_BUSY);
}

/* Buffered chars getc */
static long inbuflen;
static long inbuf[2];	/* must be 2 longs */

static int udbg_getc_pollLP(void)
{
	/* The interface is tricky because it may return up to 16 chars.
	 * We save them statically for future calls to udbg_getc().
	 */
	char ch, *buf = (char *)inbuf;
	int i;
	long rc;
	if (inbuflen == 0) {
		/* get some more chars. */
		inbuflen = 0;
		rc = plpar_get_term_char(vtermno, &inbuflen, buf);
		if (rc != H_SUCCESS)
			inbuflen = 0;	/* otherwise inbuflen is garbage */
	}
	if (inbuflen <= 0 || inbuflen > 16) {
		/* Catch error case as well as other oddities (corruption) */
		inbuflen = 0;
		return -1;
	}
	ch = buf[0];
	for (i = 1; i < inbuflen; i++)	/* shuffle them down. */
		buf[i-1] = buf[i];
	inbuflen--;
	return ch;
}

static int udbg_getcLP(void)
{
	int ch;
	for (;;) {
		ch = udbg_getc_pollLP();
		if (ch == -1) {
			/* This shouldn't be needed...but... */
			volatile unsigned long delay;
			for (delay=0; delay < 2000000; delay++)
				;
		} else {
			return ch;
		}
	}
}

/* call this from early_init() for a working debug console on
 * vterm capable LPAR machines
 */
void __init udbg_init_debug_lpar(void)
{
	vtermno = 0;
	udbg_putc = udbg_putcLP;
	udbg_getc = udbg_getcLP;
	udbg_getc_poll = udbg_getc_pollLP;

	register_early_udbg_console();
}

/* returns 0 if couldn't find or use /chosen/stdout as console */
void __init find_udbg_vterm(void)
{
	struct device_node *stdout_node;
	const u32 *termno;
	const char *name;

	/* find the boot console from /chosen/stdout */
	if (!of_chosen)
		return;
	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
	if (name == NULL)
		return;
	stdout_node = of_find_node_by_path(name);
	if (!stdout_node)
		return;
	name = of_get_property(stdout_node, "name", NULL);
	if (!name) {
		printk(KERN_WARNING "stdout node missing 'name' property!\n");
		goto out;
	}

	/* Check if it's a virtual terminal */
	if (strncmp(name, "vty", 3) != 0)
		goto out;
	termno = of_get_property(stdout_node, "reg", NULL);
	if (termno == NULL)
		goto out;
	vtermno = termno[0];

	if (of_device_is_compatible(stdout_node, "hvterm1")) {
		udbg_putc = udbg_putcLP;
		udbg_getc = udbg_getcLP;
		udbg_getc_poll = udbg_getc_pollLP;
		add_preferred_console("hvc", termno[0] & 0xff, NULL);
	} else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
		vtermno = termno[0];
		udbg_putc = udbg_hvsi_putc;
		udbg_getc = udbg_hvsi_getc;
		udbg_getc_poll = udbg_hvsi_getc_poll;
		add_preferred_console("hvsi", termno[0] & 0xff, NULL);
	}
out:
	of_node_put(stdout_node);
}

void vpa_init(int cpu)
{
	int hwcpu = get_hard_smp_processor_id(cpu);
	unsigned long addr;
	long ret;

	if (cpu_has_feature(CPU_FTR_ALTIVEC))
		lppaca[cpu].vmxregs_in_use = 1;

	addr = __pa(&lppaca[cpu]);
	ret = register_vpa(hwcpu, addr);

	if (ret) {
		printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
				"cpu %d (hw %d) of area %lx returns %ld\n",
				cpu, hwcpu, addr, ret);
		return;
	}
	/*
	 * PAPR says this feature is SLB-Buffer but firmware never
	 * reports that.  All SPLPAR support SLB shadow buffer.
	 */
	addr = __pa(&slb_shadow[cpu]);
	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
		ret = register_slb_shadow(hwcpu, addr);
		if (ret)
			printk(KERN_ERR
			       "WARNING: vpa_init: SLB shadow buffer "
			       "registration for cpu %d (hw %d) of area %lx "
			       "returns %ld\n", cpu, hwcpu, addr, ret);
	}
}

static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
 			      unsigned long va, unsigned long pa,
 			      unsigned long rflags, unsigned long vflags,
			      int psize, int ssize)
{
	unsigned long lpar_rc;
	unsigned long flags;
	unsigned long slot;
	unsigned long hpte_v, hpte_r;

	if (!(vflags & HPTE_V_BOLTED))
		pr_debug("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
			 "rflags=%lx, vflags=%lx, psize=%d)\n",
			 hpte_group, va, pa, rflags, vflags, psize);

	hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID;
	hpte_r = hpte_encode_r(pa, psize) | rflags;

	if (!(vflags & HPTE_V_BOLTED))
		pr_debug(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);

	/* Now fill in the actual HPTE */
	/* Set CEC cookie to 0         */
	/* Zero page = 0               */
	/* I-cache Invalidate = 0      */
	/* I-cache synchronize = 0     */
	/* Exact = 0                   */
	flags = 0;

	/* Make pHyp happy */
	if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU))
		hpte_r &= ~_PAGE_COHERENT;

	lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
	if (unlikely(lpar_rc == H_PTEG_FULL)) {
		if (!(vflags & HPTE_V_BOLTED))
			pr_debug(" full\n");
		return -1;
	}

	/*
	 * Since we try and ioremap PHBs we don't own, the pte insert
	 * will fail. However we must catch the failure in hash_page
	 * or we will loop forever, so return -2 in this case.
	 */
	if (unlikely(lpar_rc != H_SUCCESS)) {
		if (!(vflags & HPTE_V_BOLTED))
			pr_debug(" lpar err %lu\n", lpar_rc);
		return -2;
	}
	if (!(vflags & HPTE_V_BOLTED))
		pr_debug(" -> slot: %lu\n", slot & 7);

	/* Because of iSeries, we have to pass down the secondary
	 * bucket bit here as well
	 */
	return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
}

static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);

static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
{
	unsigned long slot_offset;
	unsigned long lpar_rc;
	int i;
	unsigned long dummy1, dummy2;

	/* pick a random slot to start at */
	slot_offset = mftb() & 0x7;

	for (i = 0; i < HPTES_PER_GROUP; i++) {

		/* don't remove a bolted entry */
		lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
					   (0x1UL << 4), &dummy1, &dummy2);
		if (lpar_rc == H_SUCCESS)
			return i;
		BUG_ON(lpar_rc != H_NOT_FOUND);

		slot_offset++;
		slot_offset &= 0x7;
	}

	return -1;
}

static void pSeries_lpar_hptab_clear(void)
{
	unsigned long size_bytes = 1UL << ppc64_pft_size;
	unsigned long hpte_count = size_bytes >> 4;
	unsigned long dummy1, dummy2, dword0;
	long lpar_rc;
	int i;

	/* TODO: Use bulk call */
	for (i = 0; i < hpte_count; i++) {
		/* dont remove HPTEs with VRMA mappings */
		lpar_rc = plpar_pte_remove_raw(H_ANDCOND, i, HPTE_V_1TB_SEG,
						&dummy1, &dummy2);
		if (lpar_rc == H_NOT_FOUND) {
			lpar_rc = plpar_pte_read_raw(0, i, &dword0, &dummy1);
			if (!lpar_rc && ((dword0 & HPTE_V_VRMA_MASK)
				!= HPTE_V_VRMA_MASK))
				/* Can be hpte for 1TB Seg. So remove it */
				plpar_pte_remove_raw(0, i, 0, &dummy1, &dummy2);
		}
	}
}

/*
 * This computes the AVPN and B fields of the first dword of a HPTE,
 * for use when we want to match an existing PTE.  The bottom 7 bits
 * of the returned value are zero.
 */
static inline unsigned long hpte_encode_avpn(unsigned long va, int psize,
					     int ssize)
{
	unsigned long v;

	v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm);
	v <<= HPTE_V_AVPN_SHIFT;
	v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT;
	return v;
}

/*
 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 * the low 3 bits of flags happen to line up.  So no transform is needed.
 * We can probably optimize here and assume the high bits of newpp are
 * already zero.  For now I am paranoid.
 */
static long pSeries_lpar_hpte_updatepp(unsigned long slot,
				       unsigned long newpp,
				       unsigned long va,
				       int psize, int ssize, int local)
{
	unsigned long lpar_rc;
	unsigned long flags = (newpp & 7) | H_AVPN;
	unsigned long want_v;

	want_v = hpte_encode_avpn(va, psize, ssize);

	pr_debug("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
		 want_v, slot, flags, psize);

	lpar_rc = plpar_pte_protect(flags, slot, want_v);

	if (lpar_rc == H_NOT_FOUND) {
		pr_debug("not found !\n");
		return -1;
	}

	pr_debug("ok\n");

	BUG_ON(lpar_rc != H_SUCCESS);

	return 0;
}

static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
{
	unsigned long dword0;
	unsigned long lpar_rc;
	unsigned long dummy_word1;
	unsigned long flags;

	/* Read 1 pte at a time                        */
	/* Do not need RPN to logical page translation */
	/* No cross CEC PFT access                     */
	flags = 0;

	lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);

	BUG_ON(lpar_rc != H_SUCCESS);

	return dword0;
}

static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize)
{
	unsigned long hash;
	unsigned long i;
	long slot;
	unsigned long want_v, hpte_v;

	hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize);
	want_v = hpte_encode_avpn(va, psize, ssize);

	/* Bolted entries are always in the primary group */
	slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
	for (i = 0; i < HPTES_PER_GROUP; i++) {
		hpte_v = pSeries_lpar_hpte_getword0(slot);

		if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
			/* HPTE matches */
			return slot;
		++slot;
	}

	return -1;
} 

static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
					     unsigned long ea,
					     int psize, int ssize)
{
	unsigned long lpar_rc, slot, vsid, va, flags;

	vsid = get_kernel_vsid(ea, ssize);
	va = hpt_va(ea, vsid, ssize);

	slot = pSeries_lpar_hpte_find(va, psize, ssize);
	BUG_ON(slot == -1);

	flags = newpp & 7;
	lpar_rc = plpar_pte_protect(flags, slot, 0);

	BUG_ON(lpar_rc != H_SUCCESS);
}

static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
					 int psize, int ssize, int local)
{
	unsigned long want_v;
	unsigned long lpar_rc;
	unsigned long dummy1, dummy2;

	pr_debug("    inval : slot=%lx, va=%016lx, psize: %d, local: %d\n",
		 slot, va, psize, local);

	want_v = hpte_encode_avpn(va, psize, ssize);
	lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
	if (lpar_rc == H_NOT_FOUND)
		return;

	BUG_ON(lpar_rc != H_SUCCESS);
}

static void pSeries_lpar_hpte_removebolted(unsigned long ea,
					   int psize, int ssize)
{
	unsigned long slot, vsid, va;

	vsid = get_kernel_vsid(ea, ssize);
	va = hpt_va(ea, vsid, ssize);

	slot = pSeries_lpar_hpte_find(va, psize, ssize);
	BUG_ON(slot == -1);

	pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, 0);
}

/* Flag bits for H_BULK_REMOVE */
#define HBR_REQUEST	0x4000000000000000UL
#define HBR_RESPONSE	0x8000000000000000UL
#define HBR_END		0xc000000000000000UL
#define HBR_AVPN	0x0200000000000000UL
#define HBR_ANDCOND	0x0100000000000000UL

/*
 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 * lock.
 */
static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
{
	unsigned long i, pix, rc;
	unsigned long flags = 0;
	struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
	int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
	unsigned long param[9];
	unsigned long va;
	unsigned long hash, index, shift, hidx, slot;
	real_pte_t pte;
	int psize, ssize;

	if (lock_tlbie)
		spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);

	psize = batch->psize;
	ssize = batch->ssize;
	pix = 0;
	for (i = 0; i < number; i++) {
		va = batch->vaddr[i];
		pte = batch->pte[i];
		pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
			hash = hpt_hash(va, shift, ssize);
			hidx = __rpte_to_hidx(pte, index);
			if (hidx & _PTEIDX_SECONDARY)
				hash = ~hash;
			slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
			slot += hidx & _PTEIDX_GROUP_IX;
			if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
				pSeries_lpar_hpte_invalidate(slot, va, psize,
							     ssize, local);
			} else {
				param[pix] = HBR_REQUEST | HBR_AVPN | slot;
				param[pix+1] = hpte_encode_avpn(va, psize,
								ssize);
				pix += 2;
				if (pix == 8) {
					rc = plpar_hcall9(H_BULK_REMOVE, param,
						param[0], param[1], param[2],
						param[3], param[4], param[5],
						param[6], param[7]);
					BUG_ON(rc != H_SUCCESS);
					pix = 0;
				}
			}
		} pte_iterate_hashed_end();
	}
	if (pix) {
		param[pix] = HBR_END;
		rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
				  param[2], param[3], param[4], param[5],
				  param[6], param[7]);
		BUG_ON(rc != H_SUCCESS);
	}

	if (lock_tlbie)
		spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
}

void __init hpte_init_lpar(void)
{
	ppc_md.hpte_invalidate	= pSeries_lpar_hpte_invalidate;
	ppc_md.hpte_updatepp	= pSeries_lpar_hpte_updatepp;
	ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
	ppc_md.hpte_insert	= pSeries_lpar_hpte_insert;
	ppc_md.hpte_remove	= pSeries_lpar_hpte_remove;
	ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
	ppc_md.flush_hash_range	= pSeries_lpar_flush_hash_range;
	ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
}

#ifdef CONFIG_PPC_SMLPAR
#define CMO_FREE_HINT_DEFAULT 1
static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;

static int __init cmo_free_hint(char *str)
{
	char *parm;
	parm = strstrip(str);

	if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
		printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
		cmo_free_hint_flag = 0;
		return 1;
	}

	cmo_free_hint_flag = 1;
	printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");

	if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
		return 1;

	return 0;
}

__setup("cmo_free_hint=", cmo_free_hint);

static void pSeries_set_page_state(struct page *page, int order,
				   unsigned long state)
{
	int i, j;
	unsigned long cmo_page_sz, addr;

	cmo_page_sz = cmo_get_page_size();
	addr = __pa((unsigned long)page_address(page));

	for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
		for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
			plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
	}
}

void arch_free_page(struct page *page, int order)
{
	if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
		return;

	pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
}
EXPORT_SYMBOL(arch_free_page);

#endif