summaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/celleb/htab.c
blob: ffa7c2c2030d27fa595ce744fa51f6925560168c (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
/*
 * "Cell Reference Set" HTAB support.
 *
 * (C) Copyright 2006-2007 TOSHIBA CORPORATION
 *
 * This code is based on arch/powerpc/platforms/pseries/lpar.c:
 *  Copyright (C) 2001 Todd Inglett, IBM Corporation
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#undef DEBUG_LOW

#include <linux/kernel.h>
#include <linux/spinlock.h>

#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/machdep.h>
#include <asm/udbg.h>

#include "beat_wrapper.h"

#ifdef DEBUG_LOW
#define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
#else
#define DBG_LOW(fmt...) do { } while(0)
#endif

static DEFINE_SPINLOCK(beat_htab_lock);

static inline unsigned int beat_read_mask(unsigned hpte_group)
{
	unsigned long hpte_v[5];
	unsigned long rmask = 0;

	beat_read_htab_entries(0, hpte_group + 0, hpte_v);
	if (!(hpte_v[0] & HPTE_V_BOLTED))
		rmask |= 0x8000;
	if (!(hpte_v[1] & HPTE_V_BOLTED))
		rmask |= 0x4000;
	if (!(hpte_v[2] & HPTE_V_BOLTED))
		rmask |= 0x2000;
	if (!(hpte_v[3] & HPTE_V_BOLTED))
		rmask |= 0x1000;
	beat_read_htab_entries(0, hpte_group + 4, hpte_v);
	if (!(hpte_v[0] & HPTE_V_BOLTED))
		rmask |= 0x0800;
	if (!(hpte_v[1] & HPTE_V_BOLTED))
		rmask |= 0x0400;
	if (!(hpte_v[2] & HPTE_V_BOLTED))
		rmask |= 0x0200;
	if (!(hpte_v[3] & HPTE_V_BOLTED))
		rmask |= 0x0100;
	hpte_group = ~hpte_group & (htab_hash_mask * HPTES_PER_GROUP);
	beat_read_htab_entries(0, hpte_group + 0, hpte_v);
	if (!(hpte_v[0] & HPTE_V_BOLTED))
		rmask |= 0x80;
	if (!(hpte_v[1] & HPTE_V_BOLTED))
		rmask |= 0x40;
	if (!(hpte_v[2] & HPTE_V_BOLTED))
		rmask |= 0x20;
	if (!(hpte_v[3] & HPTE_V_BOLTED))
		rmask |= 0x10;
	beat_read_htab_entries(0, hpte_group + 4, hpte_v);
	if (!(hpte_v[0] & HPTE_V_BOLTED))
		rmask |= 0x08;
	if (!(hpte_v[1] & HPTE_V_BOLTED))
		rmask |= 0x04;
	if (!(hpte_v[2] & HPTE_V_BOLTED))
		rmask |= 0x02;
	if (!(hpte_v[3] & HPTE_V_BOLTED))
		rmask |= 0x01;
	return rmask;
}

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

	/* same as iseries */
	if (vflags & HPTE_V_SECONDARY)
		return -1;

	if (!(vflags & HPTE_V_BOLTED))
		DBG_LOW("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) | vflags | HPTE_V_VALID;
	hpte_r = hpte_encode_r(pa, psize) | rflags;

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

	if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
		hpte_r &= ~_PAGE_COHERENT;

	spin_lock_irqsave(&beat_htab_lock, flags);
	if ((lpar_rc = beat_read_mask(hpte_group)) == 0) {
		if (!(vflags & HPTE_V_BOLTED))
			DBG_LOW(" full\n");
		spin_unlock_irqrestore(&beat_htab_lock, flags);
		return -1;
	}

	lpar_rc = beat_insert_htab_entry(0, hpte_group, lpar_rc << 48,
		hpte_v, hpte_r, &slot);
	spin_unlock_irqrestore(&beat_htab_lock, flags);

	/*
	 * 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 != 0)) {
		if (!(vflags & HPTE_V_BOLTED))
			DBG_LOW(" lpar err %lx\n", lpar_rc);
		return -2;
	}
	if (!(vflags & HPTE_V_BOLTED))
		DBG_LOW(" -> slot: %lx\n", slot);

	/* We have to pass down the secondary bucket bit here as well */
	return (slot ^ hpte_group) & 15;
}

static long beat_lpar_hpte_remove(unsigned long hpte_group)
{
	DBG_LOW("hpte_remove(group=%lx)\n", hpte_group);
	return -1;
}

static unsigned long beat_lpar_hpte_getword0(unsigned long slot)
{
	unsigned long dword0, dword[5];
	unsigned long lpar_rc;

	lpar_rc = beat_read_htab_entries(0, slot & ~3UL, dword);

	dword0 = dword[slot&3];

	BUG_ON(lpar_rc != 0);

	return dword0;
}

static void beat_lpar_hptab_clear(void)
{
	unsigned long size_bytes = 1UL << ppc64_pft_size;
	unsigned long hpte_count = size_bytes >> 4;
	int i;
	unsigned long dummy0, dummy1;

	/* TODO: Use bulk call */
	for (i = 0; i < hpte_count; i++)
		beat_write_htab_entry(0, i, 0, 0, -1UL, -1UL, &dummy0, &dummy1);
}

/*
 * 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 beat_lpar_hpte_updatepp(unsigned long slot,
				    unsigned long newpp,
				    unsigned long va,
				    int psize, int local)
{
	unsigned long lpar_rc;
	unsigned long dummy0, dummy1, want_v;
	unsigned long flags;

	want_v = hpte_encode_v(va, psize);

	DBG_LOW("    update: "
		"avpnv=%016lx, slot=%016lx, psize: %d, newpp %016lx ... ",
		want_v & HPTE_V_AVPN, slot, psize, newpp);

	spin_lock_irqsave(&beat_htab_lock, flags);
	dummy0 = beat_lpar_hpte_getword0(slot);
	if ((dummy0 & ~0x7FUL) != (want_v & ~0x7FUL)) {
		DBG_LOW("not found !\n");
		spin_unlock_irqrestore(&beat_htab_lock, flags);
		return -1;
	}

	lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7, &dummy0,
					&dummy1);
	spin_unlock_irqrestore(&beat_htab_lock, flags);
	if (lpar_rc != 0 || dummy0 == 0) {
		DBG_LOW("not found !\n");
		return -1;
	}

	DBG_LOW("ok %lx %lx\n", dummy0, dummy1);

	BUG_ON(lpar_rc != 0);

	return 0;
}

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

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

	for (j = 0; j < 2; j++) {
		slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
		for (i = 0; i < HPTES_PER_GROUP; i++) {
			hpte_v = beat_lpar_hpte_getword0(slot);

			if (HPTE_V_COMPARE(hpte_v, want_v)
			    && (hpte_v & HPTE_V_VALID)
			    && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
				/* HPTE matches */
				if (j)
					slot = -slot;
				return slot;
			}
			++slot;
		}
		hash = ~hash;
	}

	return -1;
}

static void beat_lpar_hpte_updateboltedpp(unsigned long newpp,
					  unsigned long ea,
					  int psize)
{
	unsigned long lpar_rc, slot, vsid, va, dummy0, dummy1;
	unsigned long flags;

	vsid = get_kernel_vsid(ea);
	va = (vsid << 28) | (ea & 0x0fffffff);

	spin_lock_irqsave(&beat_htab_lock, flags);
	slot = beat_lpar_hpte_find(va, psize);
	BUG_ON(slot == -1);

	lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7,
		&dummy0, &dummy1);
	spin_unlock_irqrestore(&beat_htab_lock, flags);

	BUG_ON(lpar_rc != 0);
}

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

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

	spin_lock_irqsave(&beat_htab_lock, flags);
	dummy1 = beat_lpar_hpte_getword0(slot);

	if ((dummy1 & ~0x7FUL) != (want_v & ~0x7FUL)) {
		DBG_LOW("not found !\n");
		spin_unlock_irqrestore(&beat_htab_lock, flags);
		return;
	}

	lpar_rc = beat_write_htab_entry(0, slot, 0, 0, HPTE_V_VALID, 0,
		&dummy1, &dummy2);
	spin_unlock_irqrestore(&beat_htab_lock, flags);

	BUG_ON(lpar_rc != 0);
}

void __init hpte_init_beat(void)
{
	ppc_md.hpte_invalidate	= beat_lpar_hpte_invalidate;
	ppc_md.hpte_updatepp	= beat_lpar_hpte_updatepp;
	ppc_md.hpte_updateboltedpp = beat_lpar_hpte_updateboltedpp;
	ppc_md.hpte_insert	= beat_lpar_hpte_insert;
	ppc_md.hpte_remove	= beat_lpar_hpte_remove;
	ppc_md.hpte_clear_all	= beat_lpar_hptab_clear;
}