lpar.c revision a1218720321d778134914cf90ef54cf0d1d8477c 
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
42#include "plpar_wrappers.h"
43
44#ifdef DEBUG
45#define DBG(fmt...) udbg_printf(fmt)
46#else
47#define DBG(fmt...)
48#endif
49
50/* in pSeries_hvCall.S */
51EXPORT_SYMBOL(plpar_hcall);
52EXPORT_SYMBOL(plpar_hcall_4out);
53EXPORT_SYMBOL(plpar_hcall_norets);
54EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
55
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	udbg_putc = udbg_putcLP;
197	udbg_getc = udbg_getcLP;
198	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				udbg_putc = udbg_putcLP;
232				udbg_getc = udbg_getcLP;
233				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				udbg_putc = udbg_hvsi_putc;
241				udbg_getc = udbg_hvsi_getc;
242				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
271	if (cpu_has_feature(CPU_FTR_ALTIVEC))
272		paca[cpu].lppaca.vmxregs_in_use = 1;
273
274	ret = register_vpa(flags, hwcpu, __pa(vpa));
275
276	if (ret)
277		printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
278				"cpu %d (hw %d) of area %lx returns %ld\n",
279				cpu, hwcpu, __pa(vpa), ret);
280}
281
282long pSeries_lpar_hpte_insert(unsigned long hpte_group,
283			      unsigned long va, unsigned long prpn,
284			      unsigned long vflags, unsigned long rflags)
285{
286	unsigned long lpar_rc;
287	unsigned long flags;
288	unsigned long slot;
289	unsigned long hpte_v, hpte_r;
290	unsigned long dummy0, dummy1;
291
292	hpte_v = ((va >> 23) << HPTE_V_AVPN_SHIFT) | vflags | HPTE_V_VALID;
293	if (vflags & HPTE_V_LARGE)
294		hpte_v &= ~(1UL << HPTE_V_AVPN_SHIFT);
295
296	hpte_r = (prpn << HPTE_R_RPN_SHIFT) | rflags;
297
298	/* Now fill in the actual HPTE */
299	/* Set CEC cookie to 0         */
300	/* Zero page = 0               */
301	/* I-cache Invalidate = 0      */
302	/* I-cache synchronize = 0     */
303	/* Exact = 0                   */
304	flags = 0;
305
306	/* XXX why is this here? - Anton */
307	if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
308		hpte_r &= ~_PAGE_COHERENT;
309
310	lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v,
311			      hpte_r, &slot, &dummy0, &dummy1);
312
313	if (unlikely(lpar_rc == H_PTEG_Full))
314		return -1;
315
316	/*
317	 * Since we try and ioremap PHBs we don't own, the pte insert
318	 * will fail. However we must catch the failure in hash_page
319	 * or we will loop forever, so return -2 in this case.
320	 */
321	if (unlikely(lpar_rc != H_Success))
322		return -2;
323
324	/* Because of iSeries, we have to pass down the secondary
325	 * bucket bit here as well
326	 */
327	return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
328}
329
330static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
331
332static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
333{
334	unsigned long slot_offset;
335	unsigned long lpar_rc;
336	int i;
337	unsigned long dummy1, dummy2;
338
339	/* pick a random slot to start at */
340	slot_offset = mftb() & 0x7;
341
342	for (i = 0; i < HPTES_PER_GROUP; i++) {
343
344		/* don't remove a bolted entry */
345		lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
346					   (0x1UL << 4), &dummy1, &dummy2);
347
348		if (lpar_rc == H_Success)
349			return i;
350
351		BUG_ON(lpar_rc != H_Not_Found);
352
353		slot_offset++;
354		slot_offset &= 0x7;
355	}
356
357	return -1;
358}
359
360static void pSeries_lpar_hptab_clear(void)
361{
362	unsigned long size_bytes = 1UL << ppc64_pft_size;
363	unsigned long hpte_count = size_bytes >> 4;
364	unsigned long dummy1, dummy2;
365	int i;
366
367	/* TODO: Use bulk call */
368	for (i = 0; i < hpte_count; i++)
369		plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
370}
371
372/*
373 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
374 * the low 3 bits of flags happen to line up.  So no transform is needed.
375 * We can probably optimize here and assume the high bits of newpp are
376 * already zero.  For now I am paranoid.
377 */
378static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
379				       unsigned long va, int large, int local)
380{
381	unsigned long lpar_rc;
382	unsigned long flags = (newpp & 7) | H_AVPN;
383	unsigned long avpn = va >> 23;
384
385	if (large)
386		avpn &= ~0x1UL;
387
388	lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
389
390	if (lpar_rc == H_Not_Found)
391		return -1;
392
393	BUG_ON(lpar_rc != H_Success);
394
395	return 0;
396}
397
398static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
399{
400	unsigned long dword0;
401	unsigned long lpar_rc;
402	unsigned long dummy_word1;
403	unsigned long flags;
404
405	/* Read 1 pte at a time                        */
406	/* Do not need RPN to logical page translation */
407	/* No cross CEC PFT access                     */
408	flags = 0;
409
410	lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
411
412	BUG_ON(lpar_rc != H_Success);
413
414	return dword0;
415}
416
417static long pSeries_lpar_hpte_find(unsigned long vpn)
418{
419	unsigned long hash;
420	unsigned long i, j;
421	long slot;
422	unsigned long hpte_v;
423
424	hash = hpt_hash(vpn, 0);
425
426	for (j = 0; j < 2; j++) {
427		slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
428		for (i = 0; i < HPTES_PER_GROUP; i++) {
429			hpte_v = pSeries_lpar_hpte_getword0(slot);
430
431			if ((HPTE_V_AVPN_VAL(hpte_v) == (vpn >> 11))
432			    && (hpte_v & HPTE_V_VALID)
433			    && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
434				/* HPTE matches */
435				if (j)
436					slot = -slot;
437				return slot;
438			}
439			++slot;
440		}
441		hash = ~hash;
442	}
443
444	return -1;
445}
446
447static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
448					     unsigned long ea)
449{
450	unsigned long lpar_rc;
451	unsigned long vsid, va, vpn, flags;
452	long slot;
453
454	vsid = get_kernel_vsid(ea);
455	va = (vsid << 28) | (ea & 0x0fffffff);
456	vpn = va >> PAGE_SHIFT;
457
458	slot = pSeries_lpar_hpte_find(vpn);
459	BUG_ON(slot == -1);
460
461	flags = newpp & 7;
462	lpar_rc = plpar_pte_protect(flags, slot, 0);
463
464	BUG_ON(lpar_rc != H_Success);
465}
466
467static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
468					 int large, int local)
469{
470	unsigned long avpn = va >> 23;
471	unsigned long lpar_rc;
472	unsigned long dummy1, dummy2;
473
474	if (large)
475		avpn &= ~0x1UL;
476
477	lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
478				   &dummy2);
479
480	if (lpar_rc == H_Not_Found)
481		return;
482
483	BUG_ON(lpar_rc != H_Success);
484}
485
486/*
487 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
488 * lock.
489 */
490void pSeries_lpar_flush_hash_range(unsigned long number, int local)
491{
492	int i;
493	unsigned long flags = 0;
494	struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
495	int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
496
497	if (lock_tlbie)
498		spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
499
500	for (i = 0; i < number; i++)
501		flush_hash_page(batch->vaddr[i], batch->pte[i], local);
502
503	if (lock_tlbie)
504		spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
505}
506
507void hpte_init_lpar(void)
508{
509	ppc_md.hpte_invalidate	= pSeries_lpar_hpte_invalidate;
510	ppc_md.hpte_updatepp	= pSeries_lpar_hpte_updatepp;
511	ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
512	ppc_md.hpte_insert	= pSeries_lpar_hpte_insert;
513	ppc_md.hpte_remove	= pSeries_lpar_hpte_remove;
514	ppc_md.flush_hash_range	= pSeries_lpar_flush_hash_range;
515	ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
516
517	htab_finish_init();
518}
519