1 /*
2 * "Cell Reference Set" HTAB support.
3 *
4 * (C) Copyright 2006-2007 TOSHIBA CORPORATION
5 *
6 * This code is based on arch/powerpc/platforms/pseries/lpar.c:
7 * Copyright (C) 2001 Todd Inglett, IBM Corporation
8 *
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.
13 *
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.
18 *
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.
22 */
23
24 #undef DEBUG_LOW
25
26 #include <linux/kernel.h>
27 #include <linux/spinlock.h>
28
29 #include <asm/mmu.h>
30 #include <asm/page.h>
31 #include <asm/pgtable.h>
32 #include <asm/machdep.h>
33 #include <asm/udbg.h>
34
35 #include "beat_wrapper.h"
36
37 #ifdef DEBUG_LOW
38 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while (0)
39 #else
40 #define DBG_LOW(fmt...) do { } while (0)
41 #endif
42
43 static DEFINE_RAW_SPINLOCK(beat_htab_lock);
44
beat_read_mask(unsigned hpte_group)45 static inline unsigned int beat_read_mask(unsigned hpte_group)
46 {
47 unsigned long rmask = 0;
48 u64 hpte_v[5];
49
50 beat_read_htab_entries(0, hpte_group + 0, hpte_v);
51 if (!(hpte_v[0] & HPTE_V_BOLTED))
52 rmask |= 0x8000;
53 if (!(hpte_v[1] & HPTE_V_BOLTED))
54 rmask |= 0x4000;
55 if (!(hpte_v[2] & HPTE_V_BOLTED))
56 rmask |= 0x2000;
57 if (!(hpte_v[3] & HPTE_V_BOLTED))
58 rmask |= 0x1000;
59 beat_read_htab_entries(0, hpte_group + 4, hpte_v);
60 if (!(hpte_v[0] & HPTE_V_BOLTED))
61 rmask |= 0x0800;
62 if (!(hpte_v[1] & HPTE_V_BOLTED))
63 rmask |= 0x0400;
64 if (!(hpte_v[2] & HPTE_V_BOLTED))
65 rmask |= 0x0200;
66 if (!(hpte_v[3] & HPTE_V_BOLTED))
67 rmask |= 0x0100;
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))
71 rmask |= 0x80;
72 if (!(hpte_v[1] & HPTE_V_BOLTED))
73 rmask |= 0x40;
74 if (!(hpte_v[2] & HPTE_V_BOLTED))
75 rmask |= 0x20;
76 if (!(hpte_v[3] & HPTE_V_BOLTED))
77 rmask |= 0x10;
78 beat_read_htab_entries(0, hpte_group + 4, hpte_v);
79 if (!(hpte_v[0] & HPTE_V_BOLTED))
80 rmask |= 0x08;
81 if (!(hpte_v[1] & HPTE_V_BOLTED))
82 rmask |= 0x04;
83 if (!(hpte_v[2] & HPTE_V_BOLTED))
84 rmask |= 0x02;
85 if (!(hpte_v[3] & HPTE_V_BOLTED))
86 rmask |= 0x01;
87 return rmask;
88 }
89
beat_lpar_hpte_insert(unsigned long hpte_group,unsigned long va,unsigned long pa,unsigned long rflags,unsigned long vflags,int psize,int ssize)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,
93 int psize, int ssize)
94 {
95 unsigned long lpar_rc;
96 u64 hpte_v, hpte_r, slot;
97
98 /* same as iseries */
99 if (vflags & HPTE_V_SECONDARY)
100 return -1;
101
102 if (!(vflags & HPTE_V_BOLTED))
103 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
104 "rflags=%lx, vflags=%lx, psize=%d)\n",
105 hpte_group, va, pa, rflags, vflags, psize);
106
107 hpte_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M) |
108 vflags | HPTE_V_VALID;
109 hpte_r = hpte_encode_r(pa, psize) | rflags;
110
111 if (!(vflags & HPTE_V_BOLTED))
112 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
113
114 if (rflags & _PAGE_NO_CACHE)
115 hpte_r &= ~_PAGE_COHERENT;
116
117 raw_spin_lock(&beat_htab_lock);
118 lpar_rc = beat_read_mask(hpte_group);
119 if (lpar_rc == 0) {
120 if (!(vflags & HPTE_V_BOLTED))
121 DBG_LOW(" full\n");
122 raw_spin_unlock(&beat_htab_lock);
123 return -1;
124 }
125
126 lpar_rc = beat_insert_htab_entry(0, hpte_group, lpar_rc << 48,
127 hpte_v, hpte_r, &slot);
128 raw_spin_unlock(&beat_htab_lock);
129
130 /*
131 * Since we try and ioremap PHBs we don't own, the pte insert
132 * will fail. However we must catch the failure in hash_page
133 * or we will loop forever, so return -2 in this case.
134 */
135 if (unlikely(lpar_rc != 0)) {
136 if (!(vflags & HPTE_V_BOLTED))
137 DBG_LOW(" lpar err %lx\n", lpar_rc);
138 return -2;
139 }
140 if (!(vflags & HPTE_V_BOLTED))
141 DBG_LOW(" -> slot: %lx\n", slot);
142
143 /* We have to pass down the secondary bucket bit here as well */
144 return (slot ^ hpte_group) & 15;
145 }
146
beat_lpar_hpte_remove(unsigned long hpte_group)147 static long beat_lpar_hpte_remove(unsigned long hpte_group)
148 {
149 DBG_LOW("hpte_remove(group=%lx)\n", hpte_group);
150 return -1;
151 }
152
beat_lpar_hpte_getword0(unsigned long slot)153 static unsigned long beat_lpar_hpte_getword0(unsigned long slot)
154 {
155 unsigned long dword0;
156 unsigned long lpar_rc;
157 u64 dword[5];
158
159 lpar_rc = beat_read_htab_entries(0, slot & ~3UL, dword);
160
161 dword0 = dword[slot&3];
162
163 BUG_ON(lpar_rc != 0);
164
165 return dword0;
166 }
167
beat_lpar_hptab_clear(void)168 static void beat_lpar_hptab_clear(void)
169 {
170 unsigned long size_bytes = 1UL << ppc64_pft_size;
171 unsigned long hpte_count = size_bytes >> 4;
172 int i;
173 u64 dummy0, dummy1;
174
175 /* TODO: Use bulk call */
176 for (i = 0; i < hpte_count; i++)
177 beat_write_htab_entry(0, i, 0, 0, -1UL, -1UL, &dummy0, &dummy1);
178 }
179
180 /*
181 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
182 * the low 3 bits of flags happen to line up. So no transform is needed.
183 * We can probably optimize here and assume the high bits of newpp are
184 * already zero. For now I am paranoid.
185 */
beat_lpar_hpte_updatepp(unsigned long slot,unsigned long newpp,unsigned long va,int psize,int ssize,int local)186 static long beat_lpar_hpte_updatepp(unsigned long slot,
187 unsigned long newpp,
188 unsigned long va,
189 int psize, int ssize, int local)
190 {
191 unsigned long lpar_rc;
192 u64 dummy0, dummy1;
193 unsigned long want_v;
194
195 want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
196
197 DBG_LOW(" update: "
198 "avpnv=%016lx, slot=%016lx, psize: %d, newpp %016lx ... ",
199 want_v & HPTE_V_AVPN, slot, psize, newpp);
200
201 raw_spin_lock(&beat_htab_lock);
202 dummy0 = beat_lpar_hpte_getword0(slot);
203 if ((dummy0 & ~0x7FUL) != (want_v & ~0x7FUL)) {
204 DBG_LOW("not found !\n");
205 raw_spin_unlock(&beat_htab_lock);
206 return -1;
207 }
208
209 lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7, &dummy0,
210 &dummy1);
211 raw_spin_unlock(&beat_htab_lock);
212 if (lpar_rc != 0 || dummy0 == 0) {
213 DBG_LOW("not found !\n");
214 return -1;
215 }
216
217 DBG_LOW("ok %lx %lx\n", dummy0, dummy1);
218
219 BUG_ON(lpar_rc != 0);
220
221 return 0;
222 }
223
beat_lpar_hpte_find(unsigned long va,int psize)224 static long beat_lpar_hpte_find(unsigned long va, int psize)
225 {
226 unsigned long hash;
227 unsigned long i, j;
228 long slot;
229 unsigned long want_v, hpte_v;
230
231 hash = hpt_hash(va, mmu_psize_defs[psize].shift, MMU_SEGSIZE_256M);
232 want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
233
234 for (j = 0; j < 2; j++) {
235 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
236 for (i = 0; i < HPTES_PER_GROUP; i++) {
237 hpte_v = beat_lpar_hpte_getword0(slot);
238
239 if (HPTE_V_COMPARE(hpte_v, want_v)
240 && (hpte_v & HPTE_V_VALID)
241 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
242 /* HPTE matches */
243 if (j)
244 slot = -slot;
245 return slot;
246 }
247 ++slot;
248 }
249 hash = ~hash;
250 }
251
252 return -1;
253 }
254
beat_lpar_hpte_updateboltedpp(unsigned long newpp,unsigned long ea,int psize,int ssize)255 static void beat_lpar_hpte_updateboltedpp(unsigned long newpp,
256 unsigned long ea,
257 int psize, int ssize)
258 {
259 unsigned long lpar_rc, slot, vsid, va;
260 u64 dummy0, dummy1;
261
262 vsid = get_kernel_vsid(ea, MMU_SEGSIZE_256M);
263 va = (vsid << 28) | (ea & 0x0fffffff);
264
265 raw_spin_lock(&beat_htab_lock);
266 slot = beat_lpar_hpte_find(va, psize);
267 BUG_ON(slot == -1);
268
269 lpar_rc = beat_write_htab_entry(0, slot, 0, newpp, 0, 7,
270 &dummy0, &dummy1);
271 raw_spin_unlock(&beat_htab_lock);
272
273 BUG_ON(lpar_rc != 0);
274 }
275
beat_lpar_hpte_invalidate(unsigned long slot,unsigned long va,int psize,int ssize,int local)276 static void beat_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
277 int psize, int ssize, int local)
278 {
279 unsigned long want_v;
280 unsigned long lpar_rc;
281 u64 dummy1, dummy2;
282 unsigned long flags;
283
284 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d\n",
285 slot, va, psize, local);
286 want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
287
288 raw_spin_lock_irqsave(&beat_htab_lock, flags);
289 dummy1 = beat_lpar_hpte_getword0(slot);
290
291 if ((dummy1 & ~0x7FUL) != (want_v & ~0x7FUL)) {
292 DBG_LOW("not found !\n");
293 raw_spin_unlock_irqrestore(&beat_htab_lock, flags);
294 return;
295 }
296
297 lpar_rc = beat_write_htab_entry(0, slot, 0, 0, HPTE_V_VALID, 0,
298 &dummy1, &dummy2);
299 raw_spin_unlock_irqrestore(&beat_htab_lock, flags);
300
301 BUG_ON(lpar_rc != 0);
302 }
303
hpte_init_beat(void)304 void __init hpte_init_beat(void)
305 {
306 ppc_md.hpte_invalidate = beat_lpar_hpte_invalidate;
307 ppc_md.hpte_updatepp = beat_lpar_hpte_updatepp;
308 ppc_md.hpte_updateboltedpp = beat_lpar_hpte_updateboltedpp;
309 ppc_md.hpte_insert = beat_lpar_hpte_insert;
310 ppc_md.hpte_remove = beat_lpar_hpte_remove;
311 ppc_md.hpte_clear_all = beat_lpar_hptab_clear;
312 }
313
beat_lpar_hpte_insert_v3(unsigned long hpte_group,unsigned long va,unsigned long pa,unsigned long rflags,unsigned long vflags,int psize,int ssize)314 static long beat_lpar_hpte_insert_v3(unsigned long hpte_group,
315 unsigned long va, unsigned long pa,
316 unsigned long rflags, unsigned long vflags,
317 int psize, int ssize)
318 {
319 unsigned long lpar_rc;
320 u64 hpte_v, hpte_r, slot;
321
322 /* same as iseries */
323 if (vflags & HPTE_V_SECONDARY)
324 return -1;
325
326 if (!(vflags & HPTE_V_BOLTED))
327 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
328 "rflags=%lx, vflags=%lx, psize=%d)\n",
329 hpte_group, va, pa, rflags, vflags, psize);
330
331 hpte_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M) |
332 vflags | HPTE_V_VALID;
333 hpte_r = hpte_encode_r(pa, psize) | rflags;
334
335 if (!(vflags & HPTE_V_BOLTED))
336 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
337
338 if (rflags & _PAGE_NO_CACHE)
339 hpte_r &= ~_PAGE_COHERENT;
340
341 /* insert into not-volted entry */
342 lpar_rc = beat_insert_htab_entry3(0, hpte_group, hpte_v, hpte_r,
343 HPTE_V_BOLTED, 0, &slot);
344 /*
345 * Since we try and ioremap PHBs we don't own, the pte insert
346 * will fail. However we must catch the failure in hash_page
347 * or we will loop forever, so return -2 in this case.
348 */
349 if (unlikely(lpar_rc != 0)) {
350 if (!(vflags & HPTE_V_BOLTED))
351 DBG_LOW(" lpar err %lx\n", lpar_rc);
352 return -2;
353 }
354 if (!(vflags & HPTE_V_BOLTED))
355 DBG_LOW(" -> slot: %lx\n", slot);
356
357 /* We have to pass down the secondary bucket bit here as well */
358 return (slot ^ hpte_group) & 15;
359 }
360
361 /*
362 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
363 * the low 3 bits of flags happen to line up. So no transform is needed.
364 * We can probably optimize here and assume the high bits of newpp are
365 * already zero. For now I am paranoid.
366 */
beat_lpar_hpte_updatepp_v3(unsigned long slot,unsigned long newpp,unsigned long va,int psize,int ssize,int local)367 static long beat_lpar_hpte_updatepp_v3(unsigned long slot,
368 unsigned long newpp,
369 unsigned long va,
370 int psize, int ssize, int local)
371 {
372 unsigned long lpar_rc;
373 unsigned long want_v;
374 unsigned long pss;
375
376 want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
377 pss = (psize == MMU_PAGE_4K) ? -1UL : mmu_psize_defs[psize].penc;
378
379 DBG_LOW(" update: "
380 "avpnv=%016lx, slot=%016lx, psize: %d, newpp %016lx ... ",
381 want_v & HPTE_V_AVPN, slot, psize, newpp);
382
383 lpar_rc = beat_update_htab_permission3(0, slot, want_v, pss, 7, newpp);
384
385 if (lpar_rc == 0xfffffff7) {
386 DBG_LOW("not found !\n");
387 return -1;
388 }
389
390 DBG_LOW("ok\n");
391
392 BUG_ON(lpar_rc != 0);
393
394 return 0;
395 }
396
beat_lpar_hpte_invalidate_v3(unsigned long slot,unsigned long va,int psize,int ssize,int local)397 static void beat_lpar_hpte_invalidate_v3(unsigned long slot, unsigned long va,
398 int psize, int ssize, int local)
399 {
400 unsigned long want_v;
401 unsigned long lpar_rc;
402 unsigned long pss;
403
404 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d\n",
405 slot, va, psize, local);
406 want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
407 pss = (psize == MMU_PAGE_4K) ? -1UL : mmu_psize_defs[psize].penc;
408
409 lpar_rc = beat_invalidate_htab_entry3(0, slot, want_v, pss);
410
411 /* E_busy can be valid output: page may be already replaced */
412 BUG_ON(lpar_rc != 0 && lpar_rc != 0xfffffff7);
413 }
414
_beat_lpar_hptab_clear_v3(void)415 static int64_t _beat_lpar_hptab_clear_v3(void)
416 {
417 return beat_clear_htab3(0);
418 }
419
beat_lpar_hptab_clear_v3(void)420 static void beat_lpar_hptab_clear_v3(void)
421 {
422 _beat_lpar_hptab_clear_v3();
423 }
424
hpte_init_beat_v3(void)425 void __init hpte_init_beat_v3(void)
426 {
427 if (_beat_lpar_hptab_clear_v3() == 0) {
428 ppc_md.hpte_invalidate = beat_lpar_hpte_invalidate_v3;
429 ppc_md.hpte_updatepp = beat_lpar_hpte_updatepp_v3;
430 ppc_md.hpte_updateboltedpp = beat_lpar_hpte_updateboltedpp;
431 ppc_md.hpte_insert = beat_lpar_hpte_insert_v3;
432 ppc_md.hpte_remove = beat_lpar_hpte_remove;
433 ppc_md.hpte_clear_all = beat_lpar_hptab_clear_v3;
434 } else {
435 ppc_md.hpte_invalidate = beat_lpar_hpte_invalidate;
436 ppc_md.hpte_updatepp = beat_lpar_hpte_updatepp;
437 ppc_md.hpte_updateboltedpp = beat_lpar_hpte_updateboltedpp;
438 ppc_md.hpte_insert = beat_lpar_hpte_insert;
439 ppc_md.hpte_remove = beat_lpar_hpte_remove;
440 ppc_md.hpte_clear_all = beat_lpar_hptab_clear;
441 }
442 }
443