2 * "Cell Reference Set" HTAB support.
4 * (C) Copyright 2006-2007 TOSHIBA CORPORATION
6 * This code is based on arch/powerpc/platforms/pseries/lpar.c:
7 * Copyright (C) 2001 Todd Inglett, IBM Corporation
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include <linux/kernel.h>
27 #include <linux/spinlock.h>
31 #include <asm/pgtable.h>
32 #include <asm/machdep.h>
35 #include "beat_wrapper.h"
38 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
40 #define DBG_LOW(fmt...) do { } while(0)
43 static DEFINE_SPINLOCK(beat_htab_lock);
45 static inline unsigned int beat_read_mask(unsigned hpte_group)
47 unsigned long hpte_v[5];
48 unsigned long rmask = 0;
50 beat_read_htab_entries(0, hpte_group + 0, hpte_v);
51 if (!(hpte_v[0] & HPTE_V_BOLTED))
53 if (!(hpte_v[1] & HPTE_V_BOLTED))
55 if (!(hpte_v[2] & HPTE_V_BOLTED))
57 if (!(hpte_v[3] & HPTE_V_BOLTED))
59 beat_read_htab_entries(0, hpte_group + 4, hpte_v);
60 if (!(hpte_v[0] & HPTE_V_BOLTED))
62 if (!(hpte_v[1] & HPTE_V_BOLTED))
64 if (!(hpte_v[2] & HPTE_V_BOLTED))
66 if (!(hpte_v[3] & HPTE_V_BOLTED))
68 hpte_group = ~hpte_group & (htab_hash_mask * HPTES_PER_GROUP);
69 beat_read_htab_entries(0, hpte_group + 0, hpte_v);
70 if (!(hpte_v[0] & HPTE_V_BOLTED))
72 if (!(hpte_v[1] & HPTE_V_BOLTED))
74 if (!(hpte_v[2] & HPTE_V_BOLTED))
76 if (!(hpte_v[3] & HPTE_V_BOLTED))
78 beat_read_htab_entries(0, hpte_group + 4, hpte_v);
79 if (!(hpte_v[0] & HPTE_V_BOLTED))
81 if (!(hpte_v[1] & HPTE_V_BOLTED))
83 if (!(hpte_v[2] & HPTE_V_BOLTED))
85 if (!(hpte_v[3] & HPTE_V_BOLTED))
90 static long beat_lpar_hpte_insert(unsigned long hpte_group,
91 unsigned long va, unsigned long pa,
92 unsigned long rflags, unsigned long vflags,
95 unsigned long lpar_rc;
97 unsigned long hpte_v, hpte_r;
100 if (vflags & HPTE_V_SECONDARY)
103 if (!(vflags & HPTE_V_BOLTED))
104 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
105 "rflags=%lx, vflags=%lx, psize=%d)\n",
106 hpte_group, va, pa, rflags, vflags, psize);
108 hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
109 hpte_r = hpte_encode_r(pa, psize) | rflags;
111 if (!(vflags & HPTE_V_BOLTED))
112 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
114 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
115 hpte_r &= ~_PAGE_COHERENT;
117 spin_lock(&beat_htab_lock);
118 if ((lpar_rc = beat_read_mask(hpte_group)) == 0) {
119 if (!(vflags & HPTE_V_BOLTED))
121 spin_unlock(&beat_htab_lock);
125 lpar_rc = beat_insert_htab_entry(0, hpte_group, lpar_rc << 48,
126 hpte_v, hpte_r, &slot);
127 spin_unlock(&beat_htab_lock);
130 * Since we try and ioremap PHBs we don't own, the pte insert
131 * will fail. However we must catch the failure in hash_page
132 * or we will loop forever, so return -2 in this case.
134 if (unlikely(lpar_rc != 0)) {
135 if (!(vflags & HPTE_V_BOLTED))
136 DBG_LOW(" lpar err %lx\n", lpar_rc);
139 if (!(vflags & HPTE_V_BOLTED))
140 DBG_LOW(" -> slot: %lx\n", slot);
142 /* We have to pass down the secondary bucket bit here as well */
143 return (slot ^ hpte_group) & 15;
146 static long beat_lpar_hpte_remove(unsigned long hpte_group)
148 DBG_LOW("hpte_remove(group=%lx)\n", hpte_group);
152 static unsigned long beat_lpar_hpte_getword0(unsigned long slot)
154 unsigned long dword0, dword[5];
155 unsigned long lpar_rc;
157 lpar_rc = beat_read_htab_entries(0, slot & ~3UL, dword);
159 dword0 = dword[slot&3];
161 BUG_ON(lpar_rc != 0);
166 static void beat_lpar_hptab_clear(void)
168 unsigned long size_bytes = 1UL << ppc64_pft_size;
169 unsigned long hpte_count = size_bytes >> 4;
171 unsigned long dummy0, dummy1;
173 /* TODO: Use bulk call */
174 for (i = 0; i < hpte_count; i++)
175 beat_write_htab_entry(0, i, 0, 0, -1UL, -1UL, &dummy0, &dummy1);
179 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
180 * the low 3 bits of flags happen to line up. So no transform is needed.
181 * We can probably optimize here and assume the high bits of newpp are
182 * already zero. For now I am paranoid.
184 static long beat_lpar_hpte_updatepp(unsigned long slot,
187 int psize, int local)
189 unsigned long lpar_rc;
190 unsigned long dummy0, dummy1, want_v;
192 want_v = hpte_encode_v(va, psize);
195 "avpnv=%016lx, slot=%016lx, psize: %d, newpp %016lx ... ",
196 want_v & HPTE_V_AVPN, slot, psize, newpp);
198 spin_lock(&beat_htab_lock);
199 dummy0 = beat_lpar_hpte_getword0(slot);
200 if ((dummy0 & ~0x7FUL) != (want_v & ~0x7FUL)) {
201 DBG_LOW("not found !\n");
202 spin_unlock(&beat_htab_lock);
206 lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7, &dummy0,
208 spin_unlock(&beat_htab_lock);
209 if (lpar_rc != 0 || dummy0 == 0) {
210 DBG_LOW("not found !\n");
214 DBG_LOW("ok %lx %lx\n", dummy0, dummy1);
216 BUG_ON(lpar_rc != 0);
221 static long beat_lpar_hpte_find(unsigned long va, int psize)
226 unsigned long want_v, hpte_v;
228 hash = hpt_hash(va, mmu_psize_defs[psize].shift);
229 want_v = hpte_encode_v(va, psize);
231 for (j = 0; j < 2; j++) {
232 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
233 for (i = 0; i < HPTES_PER_GROUP; i++) {
234 hpte_v = beat_lpar_hpte_getword0(slot);
236 if (HPTE_V_COMPARE(hpte_v, want_v)
237 && (hpte_v & HPTE_V_VALID)
238 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
252 static void beat_lpar_hpte_updateboltedpp(unsigned long newpp,
256 unsigned long lpar_rc, slot, vsid, va, dummy0, dummy1;
258 vsid = get_kernel_vsid(ea);
259 va = (vsid << 28) | (ea & 0x0fffffff);
261 spin_lock(&beat_htab_lock);
262 slot = beat_lpar_hpte_find(va, psize);
265 lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7,
267 spin_unlock(&beat_htab_lock);
269 BUG_ON(lpar_rc != 0);
272 static void beat_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
273 int psize, int local)
275 unsigned long want_v;
276 unsigned long lpar_rc;
277 unsigned long dummy1, dummy2;
280 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d\n",
281 slot, va, psize, local);
282 want_v = hpte_encode_v(va, psize);
284 spin_lock_irqsave(&beat_htab_lock, flags);
285 dummy1 = beat_lpar_hpte_getword0(slot);
287 if ((dummy1 & ~0x7FUL) != (want_v & ~0x7FUL)) {
288 DBG_LOW("not found !\n");
289 spin_unlock_irqrestore(&beat_htab_lock, flags);
293 lpar_rc = beat_write_htab_entry(0, slot, 0, 0, HPTE_V_VALID, 0,
295 spin_unlock_irqrestore(&beat_htab_lock, flags);
297 BUG_ON(lpar_rc != 0);
300 void __init hpte_init_beat(void)
302 ppc_md.hpte_invalidate = beat_lpar_hpte_invalidate;
303 ppc_md.hpte_updatepp = beat_lpar_hpte_updatepp;
304 ppc_md.hpte_updateboltedpp = beat_lpar_hpte_updateboltedpp;
305 ppc_md.hpte_insert = beat_lpar_hpte_insert;
306 ppc_md.hpte_remove = beat_lpar_hpte_remove;
307 ppc_md.hpte_clear_all = beat_lpar_hptab_clear;