PageRenderTime 64ms CodeModel.GetById 14ms app.highlight 45ms RepoModel.GetById 1ms app.codeStats 0ms

/arch/ppc64/kernel/pSeries_lpar.c

https://bitbucket.org/evzijst/gittest
C | 531 lines | 371 code | 85 blank | 75 comment | 83 complexity | d155d3f918006ff0a0926c3254143f41 MD5 | raw file
  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#define DEBUG
 23
 24#include <linux/config.h>
 25#include <linux/kernel.h>
 26#include <linux/dma-mapping.h>
 27#include <asm/processor.h>
 28#include <asm/mmu.h>
 29#include <asm/page.h>
 30#include <asm/pgtable.h>
 31#include <asm/machdep.h>
 32#include <asm/abs_addr.h>
 33#include <asm/mmu_context.h>
 34#include <asm/ppcdebug.h>
 35#include <asm/iommu.h>
 36#include <asm/tlbflush.h>
 37#include <asm/tlb.h>
 38#include <asm/prom.h>
 39#include <asm/abs_addr.h>
 40#include <asm/cputable.h>
 41#include <asm/plpar_wrappers.h>
 42
 43#ifdef DEBUG
 44#define DBG(fmt...) udbg_printf(fmt)
 45#else
 46#define DBG(fmt...)
 47#endif
 48
 49/* in pSeries_hvCall.S */
 50EXPORT_SYMBOL(plpar_hcall);
 51EXPORT_SYMBOL(plpar_hcall_4out);
 52EXPORT_SYMBOL(plpar_hcall_norets);
 53EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
 54
 55extern void fw_feature_init(void);
 56extern void pSeries_find_serial_port(void);
 57
 58
 59int vtermno;	/* virtual terminal# for udbg  */
 60
 61#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
 62static void udbg_hvsi_putc(unsigned char c)
 63{
 64	/* packet's seqno isn't used anyways */
 65	uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
 66	int rc;
 67
 68	if (c == '\n')
 69		udbg_hvsi_putc('\r');
 70
 71	do {
 72		rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
 73	} while (rc == H_Busy);
 74}
 75
 76static long hvsi_udbg_buf_len;
 77static uint8_t hvsi_udbg_buf[256];
 78
 79static int udbg_hvsi_getc_poll(void)
 80{
 81	unsigned char ch;
 82	int rc, i;
 83
 84	if (hvsi_udbg_buf_len == 0) {
 85		rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
 86		if (rc != H_Success || hvsi_udbg_buf[0] != 0xff) {
 87			/* bad read or non-data packet */
 88			hvsi_udbg_buf_len = 0;
 89		} else {
 90			/* remove the packet header */
 91			for (i = 4; i < hvsi_udbg_buf_len; i++)
 92				hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
 93			hvsi_udbg_buf_len -= 4;
 94		}
 95	}
 96
 97	if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
 98		/* no data ready */
 99		hvsi_udbg_buf_len = 0;
100		return -1;
101	}
102
103	ch = hvsi_udbg_buf[0];
104	/* shift remaining data down */
105	for (i = 1; i < hvsi_udbg_buf_len; i++) {
106		hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
107	}
108	hvsi_udbg_buf_len--;
109
110	return ch;
111}
112
113static unsigned char udbg_hvsi_getc(void)
114{
115	int ch;
116	for (;;) {
117		ch = udbg_hvsi_getc_poll();
118		if (ch == -1) {
119			/* This shouldn't be needed...but... */
120			volatile unsigned long delay;
121			for (delay=0; delay < 2000000; delay++)
122				;
123		} else {
124			return ch;
125		}
126	}
127}
128
129static void udbg_putcLP(unsigned char c)
130{
131	char buf[16];
132	unsigned long rc;
133
134	if (c == '\n')
135		udbg_putcLP('\r');
136
137	buf[0] = c;
138	do {
139		rc = plpar_put_term_char(vtermno, 1, buf);
140	} while(rc == H_Busy);
141}
142
143/* Buffered chars getc */
144static long inbuflen;
145static long inbuf[2];	/* must be 2 longs */
146
147static int udbg_getc_pollLP(void)
148{
149	/* The interface is tricky because it may return up to 16 chars.
150	 * We save them statically for future calls to udbg_getc().
151	 */
152	char ch, *buf = (char *)inbuf;
153	int i;
154	long rc;
155	if (inbuflen == 0) {
156		/* get some more chars. */
157		inbuflen = 0;
158		rc = plpar_get_term_char(vtermno, &inbuflen, buf);
159		if (rc != H_Success)
160			inbuflen = 0;	/* otherwise inbuflen is garbage */
161	}
162	if (inbuflen <= 0 || inbuflen > 16) {
163		/* Catch error case as well as other oddities (corruption) */
164		inbuflen = 0;
165		return -1;
166	}
167	ch = buf[0];
168	for (i = 1; i < inbuflen; i++)	/* shuffle them down. */
169		buf[i-1] = buf[i];
170	inbuflen--;
171	return ch;
172}
173
174static unsigned char udbg_getcLP(void)
175{
176	int ch;
177	for (;;) {
178		ch = udbg_getc_pollLP();
179		if (ch == -1) {
180			/* This shouldn't be needed...but... */
181			volatile unsigned long delay;
182			for (delay=0; delay < 2000000; delay++)
183				;
184		} else {
185			return ch;
186		}
187	}
188}
189
190/* call this from early_init() for a working debug console on
191 * vterm capable LPAR machines
192 */
193void udbg_init_debug_lpar(void)
194{
195	vtermno = 0;
196	ppc_md.udbg_putc = udbg_putcLP;
197	ppc_md.udbg_getc = udbg_getcLP;
198	ppc_md.udbg_getc_poll = udbg_getc_pollLP;
199}
200
201/* returns 0 if couldn't find or use /chosen/stdout as console */
202int find_udbg_vterm(void)
203{
204	struct device_node *stdout_node;
205	u32 *termno;
206	char *name;
207	int found = 0;
208
209	/* find the boot console from /chosen/stdout */
210	if (!of_chosen)
211		return 0;
212	name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
213	if (name == NULL)
214		return 0;
215	stdout_node = of_find_node_by_path(name);
216	if (!stdout_node)
217		return 0;
218
219	/* now we have the stdout node; figure out what type of device it is. */
220	name = (char *)get_property(stdout_node, "name", NULL);
221	if (!name) {
222		printk(KERN_WARNING "stdout node missing 'name' property!\n");
223		goto out;
224	}
225
226	if (strncmp(name, "vty", 3) == 0) {
227		if (device_is_compatible(stdout_node, "hvterm1")) {
228			termno = (u32 *)get_property(stdout_node, "reg", NULL);
229			if (termno) {
230				vtermno = termno[0];
231				ppc_md.udbg_putc = udbg_putcLP;
232				ppc_md.udbg_getc = udbg_getcLP;
233				ppc_md.udbg_getc_poll = udbg_getc_pollLP;
234				found = 1;
235			}
236		} else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
237			termno = (u32 *)get_property(stdout_node, "reg", NULL);
238			if (termno) {
239				vtermno = termno[0];
240				ppc_md.udbg_putc = udbg_hvsi_putc;
241				ppc_md.udbg_getc = udbg_hvsi_getc;
242				ppc_md.udbg_getc_poll = udbg_hvsi_getc_poll;
243				found = 1;
244			}
245		}
246	} else if (strncmp(name, "serial", 6)) {
247		/* XXX fix ISA serial console */
248		printk(KERN_WARNING "serial stdout on LPAR ('%s')! "
249				"can't print udbg messages\n",
250		       stdout_node->full_name);
251	} else {
252		printk(KERN_WARNING "don't know how to print to stdout '%s'\n",
253		       stdout_node->full_name);
254	}
255
256out:
257	of_node_put(stdout_node);
258	return found;
259}
260
261void vpa_init(int cpu)
262{
263	int hwcpu = get_hard_smp_processor_id(cpu);
264	unsigned long vpa = (unsigned long)&(paca[cpu].lppaca);
265	long ret;
266	unsigned long flags;
267
268	/* Register the Virtual Processor Area (VPA) */
269	flags = 1UL << (63 - 18);
270	ret = register_vpa(flags, hwcpu, __pa(vpa));
271
272	if (ret)
273		printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
274				"cpu %d (hw %d) of area %lx returns %ld\n",
275				cpu, hwcpu, __pa(vpa), ret);
276}
277
278long pSeries_lpar_hpte_insert(unsigned long hpte_group,
279			      unsigned long va, unsigned long prpn,
280			      int secondary, unsigned long hpteflags,
281			      int bolted, int large)
282{
283	unsigned long arpn = physRpn_to_absRpn(prpn);
284	unsigned long lpar_rc;
285	unsigned long flags;
286	unsigned long slot;
287	HPTE lhpte;
288	unsigned long dummy0, dummy1;
289
290	/* Fill in the local HPTE with absolute rpn, avpn and flags */
291	lhpte.dw1.dword1      = 0;
292	lhpte.dw1.dw1.rpn     = arpn;
293	lhpte.dw1.flags.flags = hpteflags;
294
295	lhpte.dw0.dword0      = 0;
296	lhpte.dw0.dw0.avpn    = va >> 23;
297	lhpte.dw0.dw0.h       = secondary;
298	lhpte.dw0.dw0.bolted  = bolted;
299	lhpte.dw0.dw0.v       = 1;
300
301	if (large) {
302		lhpte.dw0.dw0.l = 1;
303		lhpte.dw0.dw0.avpn &= ~0x1UL;
304	}
305
306	/* Now fill in the actual HPTE */
307	/* Set CEC cookie to 0         */
308	/* Zero page = 0               */
309	/* I-cache Invalidate = 0      */
310	/* I-cache synchronize = 0     */
311	/* Exact = 0                   */
312	flags = 0;
313
314	/* XXX why is this here? - Anton */
315	if (hpteflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
316		lhpte.dw1.flags.flags &= ~_PAGE_COHERENT;
317
318	lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, lhpte.dw0.dword0,
319			      lhpte.dw1.dword1, &slot, &dummy0, &dummy1);
320
321	if (unlikely(lpar_rc == H_PTEG_Full))
322		return -1;
323
324	/*
325	 * Since we try and ioremap PHBs we don't own, the pte insert
326	 * will fail. However we must catch the failure in hash_page
327	 * or we will loop forever, so return -2 in this case.
328	 */
329	if (unlikely(lpar_rc != H_Success))
330		return -2;
331
332	/* Because of iSeries, we have to pass down the secondary
333	 * bucket bit here as well
334	 */
335	return (slot & 7) | (secondary << 3);
336}
337
338static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
339
340static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
341{
342	unsigned long slot_offset;
343	unsigned long lpar_rc;
344	int i;
345	unsigned long dummy1, dummy2;
346
347	/* pick a random slot to start at */
348	slot_offset = mftb() & 0x7;
349
350	for (i = 0; i < HPTES_PER_GROUP; i++) {
351
352		/* don't remove a bolted entry */
353		lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
354					   (0x1UL << 4), &dummy1, &dummy2);
355
356		if (lpar_rc == H_Success)
357			return i;
358
359		BUG_ON(lpar_rc != H_Not_Found);
360
361		slot_offset++;
362		slot_offset &= 0x7;
363	}
364
365	return -1;
366}
367
368static void pSeries_lpar_hptab_clear(void)
369{
370	unsigned long size_bytes = 1UL << ppc64_pft_size;
371	unsigned long hpte_count = size_bytes >> 4;
372	unsigned long dummy1, dummy2;
373	int i;
374
375	/* TODO: Use bulk call */
376	for (i = 0; i < hpte_count; i++)
377		plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
378}
379
380/*
381 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
382 * the low 3 bits of flags happen to line up.  So no transform is needed.
383 * We can probably optimize here and assume the high bits of newpp are
384 * already zero.  For now I am paranoid.
385 */
386static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
387				       unsigned long va, int large, int local)
388{
389	unsigned long lpar_rc;
390	unsigned long flags = (newpp & 7) | H_AVPN;
391	unsigned long avpn = va >> 23;
392
393	if (large)
394		avpn &= ~0x1UL;
395
396	lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
397
398	if (lpar_rc == H_Not_Found)
399		return -1;
400
401	BUG_ON(lpar_rc != H_Success);
402
403	return 0;
404}
405
406static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
407{
408	unsigned long dword0;
409	unsigned long lpar_rc;
410	unsigned long dummy_word1;
411	unsigned long flags;
412
413	/* Read 1 pte at a time                        */
414	/* Do not need RPN to logical page translation */
415	/* No cross CEC PFT access                     */
416	flags = 0;
417
418	lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
419
420	BUG_ON(lpar_rc != H_Success);
421
422	return dword0;
423}
424
425static long pSeries_lpar_hpte_find(unsigned long vpn)
426{
427	unsigned long hash;
428	unsigned long i, j;
429	long slot;
430	union {
431		unsigned long dword0;
432		Hpte_dword0 dw0;
433	} hpte_dw0;
434	Hpte_dword0 dw0;
435
436	hash = hpt_hash(vpn, 0);
437
438	for (j = 0; j < 2; j++) {
439		slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
440		for (i = 0; i < HPTES_PER_GROUP; i++) {
441			hpte_dw0.dword0 = pSeries_lpar_hpte_getword0(slot);
442			dw0 = hpte_dw0.dw0;
443
444			if ((dw0.avpn == (vpn >> 11)) && dw0.v &&
445			    (dw0.h == j)) {
446				/* HPTE matches */
447				if (j)
448					slot = -slot;
449				return slot;
450			}
451			++slot;
452		}
453		hash = ~hash;
454	}
455
456	return -1;
457} 
458
459static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
460					     unsigned long ea)
461{
462	unsigned long lpar_rc;
463	unsigned long vsid, va, vpn, flags;
464	long slot;
465
466	vsid = get_kernel_vsid(ea);
467	va = (vsid << 28) | (ea & 0x0fffffff);
468	vpn = va >> PAGE_SHIFT;
469
470	slot = pSeries_lpar_hpte_find(vpn);
471	BUG_ON(slot == -1);
472
473	flags = newpp & 7;
474	lpar_rc = plpar_pte_protect(flags, slot, 0);
475
476	BUG_ON(lpar_rc != H_Success);
477}
478
479static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
480					 int large, int local)
481{
482	unsigned long avpn = va >> 23;
483	unsigned long lpar_rc;
484	unsigned long dummy1, dummy2;
485
486	if (large)
487		avpn &= ~0x1UL;
488
489	lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
490				   &dummy2);
491
492	if (lpar_rc == H_Not_Found)
493		return;
494
495	BUG_ON(lpar_rc != H_Success);
496}
497
498/*
499 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
500 * lock.
501 */
502void pSeries_lpar_flush_hash_range(unsigned long context, unsigned long number,
503				   int local)
504{
505	int i;
506	unsigned long flags = 0;
507	struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
508	int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
509
510	if (lock_tlbie)
511		spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
512
513	for (i = 0; i < number; i++)
514		flush_hash_page(context, batch->addr[i], batch->pte[i], local);
515
516	if (lock_tlbie)
517		spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
518}
519
520void hpte_init_lpar(void)
521{
522	ppc_md.hpte_invalidate	= pSeries_lpar_hpte_invalidate;
523	ppc_md.hpte_updatepp	= pSeries_lpar_hpte_updatepp;
524	ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
525	ppc_md.hpte_insert	= pSeries_lpar_hpte_insert;
526	ppc_md.hpte_remove	= pSeries_lpar_hpte_remove;
527	ppc_md.flush_hash_range	= pSeries_lpar_flush_hash_range;
528	ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
529
530	htab_finish_init();
531}