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 <asm/processor.h>
29 #include <asm/mmu.h>
30 #include <asm/page.h>
31 #include <asm/pgtable.h>
32 #include <asm/machdep.h>
33 #include <asm/abs_addr.h>
34 #include <asm/mmu_context.h>
35 #include <asm/iommu.h>
36 #include <asm/tlbflush.h>
37 #include <asm/tlb.h>
38 #include <asm/prom.h>
39 #include <asm/cputable.h>
40 #include <asm/udbg.h>
41 #include <asm/smp.h>
42 #include <asm/trace.h>
43
44 #include "plpar_wrappers.h"
45 #include "pseries.h"
46
47
48 /* in hvCall.S */
49 EXPORT_SYMBOL(plpar_hcall);
50 EXPORT_SYMBOL(plpar_hcall9);
51 EXPORT_SYMBOL(plpar_hcall_norets);
52
53 extern void pSeries_find_serial_port(void);
54
55
56 static int vtermno; /* virtual terminal# for udbg */
57
58 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
udbg_hvsi_putc(char c)59 static void udbg_hvsi_putc(char c)
60 {
61 /* packet's seqno isn't used anyways */
62 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
63 int rc;
64
65 if (c == '\n')
66 udbg_hvsi_putc('\r');
67
68 do {
69 rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
70 } while (rc == H_BUSY);
71 }
72
73 static long hvsi_udbg_buf_len;
74 static uint8_t hvsi_udbg_buf[256];
75
udbg_hvsi_getc_poll(void)76 static int udbg_hvsi_getc_poll(void)
77 {
78 unsigned char ch;
79 int rc, i;
80
81 if (hvsi_udbg_buf_len == 0) {
82 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
83 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) {
84 /* bad read or non-data packet */
85 hvsi_udbg_buf_len = 0;
86 } else {
87 /* remove the packet header */
88 for (i = 4; i < hvsi_udbg_buf_len; i++)
89 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
90 hvsi_udbg_buf_len -= 4;
91 }
92 }
93
94 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
95 /* no data ready */
96 hvsi_udbg_buf_len = 0;
97 return -1;
98 }
99
100 ch = hvsi_udbg_buf[0];
101 /* shift remaining data down */
102 for (i = 1; i < hvsi_udbg_buf_len; i++) {
103 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
104 }
105 hvsi_udbg_buf_len--;
106
107 return ch;
108 }
109
udbg_hvsi_getc(void)110 static int udbg_hvsi_getc(void)
111 {
112 int ch;
113 for (;;) {
114 ch = udbg_hvsi_getc_poll();
115 if (ch == -1) {
116 /* This shouldn't be needed...but... */
117 volatile unsigned long delay;
118 for (delay=0; delay < 2000000; delay++)
119 ;
120 } else {
121 return ch;
122 }
123 }
124 }
125
udbg_putcLP(char c)126 static void udbg_putcLP(char c)
127 {
128 char buf[16];
129 unsigned long rc;
130
131 if (c == '\n')
132 udbg_putcLP('\r');
133
134 buf[0] = c;
135 do {
136 rc = plpar_put_term_char(vtermno, 1, buf);
137 } while(rc == H_BUSY);
138 }
139
140 /* Buffered chars getc */
141 static long inbuflen;
142 static long inbuf[2]; /* must be 2 longs */
143
udbg_getc_pollLP(void)144 static int udbg_getc_pollLP(void)
145 {
146 /* The interface is tricky because it may return up to 16 chars.
147 * We save them statically for future calls to udbg_getc().
148 */
149 char ch, *buf = (char *)inbuf;
150 int i;
151 long rc;
152 if (inbuflen == 0) {
153 /* get some more chars. */
154 inbuflen = 0;
155 rc = plpar_get_term_char(vtermno, &inbuflen, buf);
156 if (rc != H_SUCCESS)
157 inbuflen = 0; /* otherwise inbuflen is garbage */
158 }
159 if (inbuflen <= 0 || inbuflen > 16) {
160 /* Catch error case as well as other oddities (corruption) */
161 inbuflen = 0;
162 return -1;
163 }
164 ch = buf[0];
165 for (i = 1; i < inbuflen; i++) /* shuffle them down. */
166 buf[i-1] = buf[i];
167 inbuflen--;
168 return ch;
169 }
170
udbg_getcLP(void)171 static int udbg_getcLP(void)
172 {
173 int ch;
174 for (;;) {
175 ch = udbg_getc_pollLP();
176 if (ch == -1) {
177 /* This shouldn't be needed...but... */
178 volatile unsigned long delay;
179 for (delay=0; delay < 2000000; delay++)
180 ;
181 } else {
182 return ch;
183 }
184 }
185 }
186
187 /* call this from early_init() for a working debug console on
188 * vterm capable LPAR machines
189 */
udbg_init_debug_lpar(void)190 void __init udbg_init_debug_lpar(void)
191 {
192 vtermno = 0;
193 udbg_putc = udbg_putcLP;
194 udbg_getc = udbg_getcLP;
195 udbg_getc_poll = udbg_getc_pollLP;
196
197 register_early_udbg_console();
198 }
199
200 /* returns 0 if couldn't find or use /chosen/stdout as console */
find_udbg_vterm(void)201 void __init find_udbg_vterm(void)
202 {
203 struct device_node *stdout_node;
204 const u32 *termno;
205 const char *name;
206
207 /* find the boot console from /chosen/stdout */
208 if (!of_chosen)
209 return;
210 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
211 if (name == NULL)
212 return;
213 stdout_node = of_find_node_by_path(name);
214 if (!stdout_node)
215 return;
216 name = of_get_property(stdout_node, "name", NULL);
217 if (!name) {
218 printk(KERN_WARNING "stdout node missing 'name' property!\n");
219 goto out;
220 }
221
222 /* Check if it's a virtual terminal */
223 if (strncmp(name, "vty", 3) != 0)
224 goto out;
225 termno = of_get_property(stdout_node, "reg", NULL);
226 if (termno == NULL)
227 goto out;
228 vtermno = termno[0];
229
230 if (of_device_is_compatible(stdout_node, "hvterm1")) {
231 udbg_putc = udbg_putcLP;
232 udbg_getc = udbg_getcLP;
233 udbg_getc_poll = udbg_getc_pollLP;
234 add_preferred_console("hvc", termno[0] & 0xff, NULL);
235 } else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
236 vtermno = termno[0];
237 udbg_putc = udbg_hvsi_putc;
238 udbg_getc = udbg_hvsi_getc;
239 udbg_getc_poll = udbg_hvsi_getc_poll;
240 add_preferred_console("hvsi", termno[0] & 0xff, NULL);
241 }
242 out:
243 of_node_put(stdout_node);
244 }
245
vpa_init(int cpu)246 void vpa_init(int cpu)
247 {
248 int hwcpu = get_hard_smp_processor_id(cpu);
249 unsigned long addr;
250 long ret;
251 struct paca_struct *pp;
252 struct dtl_entry *dtl;
253
254 if (cpu_has_feature(CPU_FTR_ALTIVEC))
255 lppaca_of(cpu).vmxregs_in_use = 1;
256
257 addr = __pa(&lppaca_of(cpu));
258 ret = register_vpa(hwcpu, addr);
259
260 if (ret) {
261 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
262 "cpu %d (hw %d) of area %lx returns %ld\n",
263 cpu, hwcpu, addr, ret);
264 return;
265 }
266 /*
267 * PAPR says this feature is SLB-Buffer but firmware never
268 * reports that. All SPLPAR support SLB shadow buffer.
269 */
270 addr = __pa(&slb_shadow[cpu]);
271 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
272 ret = register_slb_shadow(hwcpu, addr);
273 if (ret)
274 printk(KERN_ERR
275 "WARNING: vpa_init: SLB shadow buffer "
276 "registration for cpu %d (hw %d) of area %lx "
277 "returns %ld\n", cpu, hwcpu, addr, ret);
278 }
279
280 /*
281 * Register dispatch trace log, if one has been allocated.
282 */
283 pp = &paca[cpu];
284 dtl = pp->dispatch_log;
285 if (dtl) {
286 pp->dtl_ridx = 0;
287 pp->dtl_curr = dtl;
288 lppaca_of(cpu).dtl_idx = 0;
289
290 /* hypervisor reads buffer length from this field */
291 dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
292 ret = register_dtl(hwcpu, __pa(dtl));
293 if (ret)
294 pr_warn("DTL registration failed for cpu %d (%ld)\n",
295 cpu, ret);
296 lppaca_of(cpu).dtl_enable_mask = 2;
297 }
298 }
299
pSeries_lpar_hpte_insert(unsigned long hpte_group,unsigned long va,unsigned long pa,unsigned long rflags,unsigned long vflags,int psize,int ssize)300 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
301 unsigned long va, unsigned long pa,
302 unsigned long rflags, unsigned long vflags,
303 int psize, int ssize)
304 {
305 unsigned long lpar_rc;
306 unsigned long flags;
307 unsigned long slot;
308 unsigned long hpte_v, hpte_r;
309
310 if (!(vflags & HPTE_V_BOLTED))
311 pr_devel("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
312 "rflags=%lx, vflags=%lx, psize=%d)\n",
313 hpte_group, va, pa, rflags, vflags, psize);
314
315 hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID;
316 hpte_r = hpte_encode_r(pa, psize) | rflags;
317
318 if (!(vflags & HPTE_V_BOLTED))
319 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
320
321 /* Now fill in the actual HPTE */
322 /* Set CEC cookie to 0 */
323 /* Zero page = 0 */
324 /* I-cache Invalidate = 0 */
325 /* I-cache synchronize = 0 */
326 /* Exact = 0 */
327 flags = 0;
328
329 /* Make pHyp happy */
330 if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU))
331 hpte_r &= ~_PAGE_COHERENT;
332
333 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
334 if (unlikely(lpar_rc == H_PTEG_FULL)) {
335 if (!(vflags & HPTE_V_BOLTED))
336 pr_devel(" full\n");
337 return -1;
338 }
339
340 /*
341 * Since we try and ioremap PHBs we don't own, the pte insert
342 * will fail. However we must catch the failure in hash_page
343 * or we will loop forever, so return -2 in this case.
344 */
345 if (unlikely(lpar_rc != H_SUCCESS)) {
346 if (!(vflags & HPTE_V_BOLTED))
347 pr_devel(" lpar err %lu\n", lpar_rc);
348 return -2;
349 }
350 if (!(vflags & HPTE_V_BOLTED))
351 pr_devel(" -> slot: %lu\n", slot & 7);
352
353 /* Because of iSeries, we have to pass down the secondary
354 * bucket bit here as well
355 */
356 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
357 }
358
359 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
360
pSeries_lpar_hpte_remove(unsigned long hpte_group)361 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
362 {
363 unsigned long slot_offset;
364 unsigned long lpar_rc;
365 int i;
366 unsigned long dummy1, dummy2;
367
368 /* pick a random slot to start at */
369 slot_offset = mftb() & 0x7;
370
371 for (i = 0; i < HPTES_PER_GROUP; i++) {
372
373 /* don't remove a bolted entry */
374 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
375 (0x1UL << 4), &dummy1, &dummy2);
376 if (lpar_rc == H_SUCCESS)
377 return i;
378 BUG_ON(lpar_rc != H_NOT_FOUND);
379
380 slot_offset++;
381 slot_offset &= 0x7;
382 }
383
384 return -1;
385 }
386
pSeries_lpar_hptab_clear(void)387 static void pSeries_lpar_hptab_clear(void)
388 {
389 unsigned long size_bytes = 1UL << ppc64_pft_size;
390 unsigned long hpte_count = size_bytes >> 4;
391 struct {
392 unsigned long pteh;
393 unsigned long ptel;
394 } ptes[4];
395 long lpar_rc;
396 int i, j;
397
398 /* Read in batches of 4,
399 * invalidate only valid entries not in the VRMA
400 * hpte_count will be a multiple of 4
401 */
402 for (i = 0; i < hpte_count; i += 4) {
403 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
404 if (lpar_rc != H_SUCCESS)
405 continue;
406 for (j = 0; j < 4; j++){
407 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
408 HPTE_V_VRMA_MASK)
409 continue;
410 if (ptes[j].pteh & HPTE_V_VALID)
411 plpar_pte_remove_raw(0, i + j, 0,
412 &(ptes[j].pteh), &(ptes[j].ptel));
413 }
414 }
415 }
416
417 /*
418 * This computes the AVPN and B fields of the first dword of a HPTE,
419 * for use when we want to match an existing PTE. The bottom 7 bits
420 * of the returned value are zero.
421 */
hpte_encode_avpn(unsigned long va,int psize,int ssize)422 static inline unsigned long hpte_encode_avpn(unsigned long va, int psize,
423 int ssize)
424 {
425 unsigned long v;
426
427 v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm);
428 v <<= HPTE_V_AVPN_SHIFT;
429 v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT;
430 return v;
431 }
432
433 /*
434 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
435 * the low 3 bits of flags happen to line up. So no transform is needed.
436 * We can probably optimize here and assume the high bits of newpp are
437 * already zero. For now I am paranoid.
438 */
pSeries_lpar_hpte_updatepp(unsigned long slot,unsigned long newpp,unsigned long va,int psize,int ssize,int local)439 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
440 unsigned long newpp,
441 unsigned long va,
442 int psize, int ssize, int local)
443 {
444 unsigned long lpar_rc;
445 unsigned long flags = (newpp & 7) | H_AVPN;
446 unsigned long want_v;
447
448 want_v = hpte_encode_avpn(va, psize, ssize);
449
450 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
451 want_v, slot, flags, psize);
452
453 lpar_rc = plpar_pte_protect(flags, slot, want_v);
454
455 if (lpar_rc == H_NOT_FOUND) {
456 pr_devel("not found !\n");
457 return -1;
458 }
459
460 pr_devel("ok\n");
461
462 BUG_ON(lpar_rc != H_SUCCESS);
463
464 return 0;
465 }
466
pSeries_lpar_hpte_getword0(unsigned long slot)467 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
468 {
469 unsigned long dword0;
470 unsigned long lpar_rc;
471 unsigned long dummy_word1;
472 unsigned long flags;
473
474 /* Read 1 pte at a time */
475 /* Do not need RPN to logical page translation */
476 /* No cross CEC PFT access */
477 flags = 0;
478
479 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
480
481 BUG_ON(lpar_rc != H_SUCCESS);
482
483 return dword0;
484 }
485
pSeries_lpar_hpte_find(unsigned long va,int psize,int ssize)486 static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize)
487 {
488 unsigned long hash;
489 unsigned long i;
490 long slot;
491 unsigned long want_v, hpte_v;
492
493 hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize);
494 want_v = hpte_encode_avpn(va, psize, ssize);
495
496 /* Bolted entries are always in the primary group */
497 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
498 for (i = 0; i < HPTES_PER_GROUP; i++) {
499 hpte_v = pSeries_lpar_hpte_getword0(slot);
500
501 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
502 /* HPTE matches */
503 return slot;
504 ++slot;
505 }
506
507 return -1;
508 }
509
pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,unsigned long ea,int psize,int ssize)510 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
511 unsigned long ea,
512 int psize, int ssize)
513 {
514 unsigned long lpar_rc, slot, vsid, va, flags;
515
516 vsid = get_kernel_vsid(ea, ssize);
517 va = hpt_va(ea, vsid, ssize);
518
519 slot = pSeries_lpar_hpte_find(va, psize, ssize);
520 BUG_ON(slot == -1);
521
522 flags = newpp & 7;
523 lpar_rc = plpar_pte_protect(flags, slot, 0);
524
525 BUG_ON(lpar_rc != H_SUCCESS);
526 }
527
pSeries_lpar_hpte_invalidate(unsigned long slot,unsigned long va,int psize,int ssize,int local)528 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
529 int psize, int ssize, int local)
530 {
531 unsigned long want_v;
532 unsigned long lpar_rc;
533 unsigned long dummy1, dummy2;
534
535 pr_devel(" inval : slot=%lx, va=%016lx, psize: %d, local: %d\n",
536 slot, va, psize, local);
537
538 want_v = hpte_encode_avpn(va, psize, ssize);
539 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
540 if (lpar_rc == H_NOT_FOUND)
541 return;
542
543 BUG_ON(lpar_rc != H_SUCCESS);
544 }
545
pSeries_lpar_hpte_removebolted(unsigned long ea,int psize,int ssize)546 static void pSeries_lpar_hpte_removebolted(unsigned long ea,
547 int psize, int ssize)
548 {
549 unsigned long slot, vsid, va;
550
551 vsid = get_kernel_vsid(ea, ssize);
552 va = hpt_va(ea, vsid, ssize);
553
554 slot = pSeries_lpar_hpte_find(va, psize, ssize);
555 BUG_ON(slot == -1);
556
557 pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, 0);
558 }
559
560 /* Flag bits for H_BULK_REMOVE */
561 #define HBR_REQUEST 0x4000000000000000UL
562 #define HBR_RESPONSE 0x8000000000000000UL
563 #define HBR_END 0xc000000000000000UL
564 #define HBR_AVPN 0x0200000000000000UL
565 #define HBR_ANDCOND 0x0100000000000000UL
566
567 /*
568 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
569 * lock.
570 */
pSeries_lpar_flush_hash_range(unsigned long number,int local)571 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
572 {
573 unsigned long i, pix, rc;
574 unsigned long flags = 0;
575 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
576 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
577 unsigned long param[9];
578 unsigned long va;
579 unsigned long hash, index, shift, hidx, slot;
580 real_pte_t pte;
581 int psize, ssize;
582
583 if (lock_tlbie)
584 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
585
586 psize = batch->psize;
587 ssize = batch->ssize;
588 pix = 0;
589 for (i = 0; i < number; i++) {
590 va = batch->vaddr[i];
591 pte = batch->pte[i];
592 pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
593 hash = hpt_hash(va, shift, ssize);
594 hidx = __rpte_to_hidx(pte, index);
595 if (hidx & _PTEIDX_SECONDARY)
596 hash = ~hash;
597 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
598 slot += hidx & _PTEIDX_GROUP_IX;
599 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
600 pSeries_lpar_hpte_invalidate(slot, va, psize,
601 ssize, local);
602 } else {
603 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
604 param[pix+1] = hpte_encode_avpn(va, psize,
605 ssize);
606 pix += 2;
607 if (pix == 8) {
608 rc = plpar_hcall9(H_BULK_REMOVE, param,
609 param[0], param[1], param[2],
610 param[3], param[4], param[5],
611 param[6], param[7]);
612 BUG_ON(rc != H_SUCCESS);
613 pix = 0;
614 }
615 }
616 } pte_iterate_hashed_end();
617 }
618 if (pix) {
619 param[pix] = HBR_END;
620 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
621 param[2], param[3], param[4], param[5],
622 param[6], param[7]);
623 BUG_ON(rc != H_SUCCESS);
624 }
625
626 if (lock_tlbie)
627 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
628 }
629
disable_bulk_remove(char * str)630 static int __init disable_bulk_remove(char *str)
631 {
632 if (strcmp(str, "off") == 0 &&
633 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
634 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
635 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
636 }
637 return 1;
638 }
639
640 __setup("bulk_remove=", disable_bulk_remove);
641
hpte_init_lpar(void)642 void __init hpte_init_lpar(void)
643 {
644 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
645 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
646 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
647 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
648 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
649 ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
650 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
651 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;
652 }
653
654 #ifdef CONFIG_PPC_SMLPAR
655 #define CMO_FREE_HINT_DEFAULT 1
656 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
657
cmo_free_hint(char * str)658 static int __init cmo_free_hint(char *str)
659 {
660 char *parm;
661 parm = strstrip(str);
662
663 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
664 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
665 cmo_free_hint_flag = 0;
666 return 1;
667 }
668
669 cmo_free_hint_flag = 1;
670 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
671
672 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
673 return 1;
674
675 return 0;
676 }
677
678 __setup("cmo_free_hint=", cmo_free_hint);
679
pSeries_set_page_state(struct page * page,int order,unsigned long state)680 static void pSeries_set_page_state(struct page *page, int order,
681 unsigned long state)
682 {
683 int i, j;
684 unsigned long cmo_page_sz, addr;
685
686 cmo_page_sz = cmo_get_page_size();
687 addr = __pa((unsigned long)page_address(page));
688
689 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
690 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
691 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
692 }
693 }
694
arch_free_page(struct page * page,int order)695 void arch_free_page(struct page *page, int order)
696 {
697 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
698 return;
699
700 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
701 }
702 EXPORT_SYMBOL(arch_free_page);
703
704 #endif
705
706 #ifdef CONFIG_TRACEPOINTS
707 /*
708 * We optimise our hcall path by placing hcall_tracepoint_refcount
709 * directly in the TOC so we can check if the hcall tracepoints are
710 * enabled via a single load.
711 */
712
713 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
714 extern long hcall_tracepoint_refcount;
715
716 /*
717 * Since the tracing code might execute hcalls we need to guard against
718 * recursion. One example of this are spinlocks calling H_YIELD on
719 * shared processor partitions.
720 */
721 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
722
hcall_tracepoint_regfunc(void)723 void hcall_tracepoint_regfunc(void)
724 {
725 hcall_tracepoint_refcount++;
726 }
727
hcall_tracepoint_unregfunc(void)728 void hcall_tracepoint_unregfunc(void)
729 {
730 hcall_tracepoint_refcount--;
731 }
732
__trace_hcall_entry(unsigned long opcode,unsigned long * args)733 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
734 {
735 unsigned long flags;
736 unsigned int *depth;
737
738 local_irq_save(flags);
739
740 depth = &__get_cpu_var(hcall_trace_depth);
741
742 if (*depth)
743 goto out;
744
745 (*depth)++;
746 trace_hcall_entry(opcode, args);
747 (*depth)--;
748
749 out:
750 local_irq_restore(flags);
751 }
752
__trace_hcall_exit(long opcode,unsigned long retval,unsigned long * retbuf)753 void __trace_hcall_exit(long opcode, unsigned long retval,
754 unsigned long *retbuf)
755 {
756 unsigned long flags;
757 unsigned int *depth;
758
759 local_irq_save(flags);
760
761 depth = &__get_cpu_var(hcall_trace_depth);
762
763 if (*depth)
764 goto out;
765
766 (*depth)++;
767 trace_hcall_exit(opcode, retval, retbuf);
768 (*depth)--;
769
770 out:
771 local_irq_restore(flags);
772 }
773 #endif
774