lpar.c revision b9377ffc3a03cde558d76349a262a1adbb6d3112 
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#undef DEBUG_LOW
23
24#include <linux/kernel.h>
25#include <linux/dma-mapping.h>
26#include <linux/console.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/iommu.h>
35#include <asm/tlbflush.h>
36#include <asm/tlb.h>
37#include <asm/prom.h>
38#include <asm/abs_addr.h>
39#include <asm/cputable.h>
40#include <asm/udbg.h>
41#include <asm/smp.h>
42
43#include "plpar_wrappers.h"
44
45#ifdef DEBUG_LOW
46#define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
47#else
48#define DBG_LOW(fmt...) do { } while(0)
49#endif
50
51/* in hvCall.S */
52EXPORT_SYMBOL(plpar_hcall);
53EXPORT_SYMBOL(plpar_hcall9);
54EXPORT_SYMBOL(plpar_hcall_norets);
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(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 int 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(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 int 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 __init 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 */
202void __init find_udbg_vterm(void)
203{
204	struct device_node *stdout_node;
205	const u32 *termno;
206	const char *name;
207	int add_console;
208
209	/* find the boot console from /chosen/stdout */
210	if (!of_chosen)
211		return;
212	name = get_property(of_chosen, "linux,stdout-path", NULL);
213	if (name == NULL)
214		return;
215	stdout_node = of_find_node_by_path(name);
216	if (!stdout_node)
217		return;
218	name = get_property(stdout_node, "name", NULL);
219	if (!name) {
220		printk(KERN_WARNING "stdout node missing 'name' property!\n");
221		goto out;
222	}
223	/* The user has requested a console so this is already set up. */
224	add_console = !strstr(cmd_line, "console=");
225
226	/* Check if it's a virtual terminal */
227	if (strncmp(name, "vty", 3) != 0)
228		goto out;
229	termno = get_property(stdout_node, "reg", NULL);
230	if (termno == NULL)
231		goto out;
232	vtermno = termno[0];
233
234	if (device_is_compatible(stdout_node, "hvterm1")) {
235		udbg_putc = udbg_putcLP;
236		udbg_getc = udbg_getcLP;
237		udbg_getc_poll = udbg_getc_pollLP;
238		if (add_console)
239			add_preferred_console("hvc", termno[0] & 0xff, NULL);
240	} else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
241		vtermno = termno[0];
242		udbg_putc = udbg_hvsi_putc;
243		udbg_getc = udbg_hvsi_getc;
244		udbg_getc_poll = udbg_hvsi_getc_poll;
245		if (add_console)
246			add_preferred_console("hvsi", termno[0] & 0xff, NULL);
247	}
248out:
249	of_node_put(stdout_node);
250}
251
252void vpa_init(int cpu)
253{
254	int hwcpu = get_hard_smp_processor_id(cpu);
255	unsigned long vpa = __pa(&lppaca[cpu]);
256	long ret;
257
258	if (cpu_has_feature(CPU_FTR_ALTIVEC))
259		lppaca[cpu].vmxregs_in_use = 1;
260
261	ret = register_vpa(hwcpu, vpa);
262
263	if (ret)
264		printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
265				"cpu %d (hw %d) of area %lx returns %ld\n",
266				cpu, hwcpu, vpa, ret);
267}
268
269long pSeries_lpar_hpte_insert(unsigned long hpte_group,
270 			      unsigned long va, unsigned long pa,
271 			      unsigned long rflags, unsigned long vflags,
272 			      int psize)
273{
274	unsigned long lpar_rc;
275	unsigned long flags;
276	unsigned long slot;
277	unsigned long hpte_v, hpte_r;
278
279	if (!(vflags & HPTE_V_BOLTED))
280		DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
281			"rflags=%lx, vflags=%lx, psize=%d)\n",
282		hpte_group, va, pa, rflags, vflags, psize);
283
284 	hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
285	hpte_r = hpte_encode_r(pa, psize) | rflags;
286
287	if (!(vflags & HPTE_V_BOLTED))
288		DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
289
290	/* Now fill in the actual HPTE */
291	/* Set CEC cookie to 0         */
292	/* Zero page = 0               */
293	/* I-cache Invalidate = 0      */
294	/* I-cache synchronize = 0     */
295	/* Exact = 0                   */
296	flags = 0;
297
298	/* Make pHyp happy */
299	if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
300		hpte_r &= ~_PAGE_COHERENT;
301
302	lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
303	if (unlikely(lpar_rc == H_PTEG_FULL)) {
304		if (!(vflags & HPTE_V_BOLTED))
305			DBG_LOW(" full\n");
306		return -1;
307	}
308
309	/*
310	 * Since we try and ioremap PHBs we don't own, the pte insert
311	 * will fail. However we must catch the failure in hash_page
312	 * or we will loop forever, so return -2 in this case.
313	 */
314	if (unlikely(lpar_rc != H_SUCCESS)) {
315		if (!(vflags & HPTE_V_BOLTED))
316			DBG_LOW(" lpar err %d\n", lpar_rc);
317		return -2;
318	}
319	if (!(vflags & HPTE_V_BOLTED))
320		DBG_LOW(" -> slot: %d\n", slot & 7);
321
322	/* Because of iSeries, we have to pass down the secondary
323	 * bucket bit here as well
324	 */
325	return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
326}
327
328static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
329
330static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
331{
332	unsigned long slot_offset;
333	unsigned long lpar_rc;
334	int i;
335	unsigned long dummy1, dummy2;
336
337	/* pick a random slot to start at */
338	slot_offset = mftb() & 0x7;
339
340	for (i = 0; i < HPTES_PER_GROUP; i++) {
341
342		/* don't remove a bolted entry */
343		lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
344					   (0x1UL << 4), &dummy1, &dummy2);
345		if (lpar_rc == H_SUCCESS)
346			return i;
347		BUG_ON(lpar_rc != H_NOT_FOUND);
348
349		slot_offset++;
350		slot_offset &= 0x7;
351	}
352
353	return -1;
354}
355
356static void pSeries_lpar_hptab_clear(void)
357{
358	unsigned long size_bytes = 1UL << ppc64_pft_size;
359	unsigned long hpte_count = size_bytes >> 4;
360	unsigned long dummy1, dummy2;
361	int i;
362
363	/* TODO: Use bulk call */
364	for (i = 0; i < hpte_count; i++)
365		plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
366}
367
368/*
369 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
370 * the low 3 bits of flags happen to line up.  So no transform is needed.
371 * We can probably optimize here and assume the high bits of newpp are
372 * already zero.  For now I am paranoid.
373 */
374static long pSeries_lpar_hpte_updatepp(unsigned long slot,
375				       unsigned long newpp,
376				       unsigned long va,
377				       int psize, int local)
378{
379	unsigned long lpar_rc;
380	unsigned long flags = (newpp & 7) | H_AVPN;
381	unsigned long want_v;
382
383	want_v = hpte_encode_v(va, psize);
384
385	DBG_LOW("    update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
386		want_v & HPTE_V_AVPN, slot, flags, psize);
387
388	lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN);
389
390	if (lpar_rc == H_NOT_FOUND) {
391		DBG_LOW("not found !\n");
392		return -1;
393	}
394
395	DBG_LOW("ok\n");
396
397	BUG_ON(lpar_rc != H_SUCCESS);
398
399	return 0;
400}
401
402static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
403{
404	unsigned long dword0;
405	unsigned long lpar_rc;
406	unsigned long dummy_word1;
407	unsigned long flags;
408
409	/* Read 1 pte at a time                        */
410	/* Do not need RPN to logical page translation */
411	/* No cross CEC PFT access                     */
412	flags = 0;
413
414	lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
415
416	BUG_ON(lpar_rc != H_SUCCESS);
417
418	return dword0;
419}
420
421static long pSeries_lpar_hpte_find(unsigned long va, int psize)
422{
423	unsigned long hash;
424	unsigned long i, j;
425	long slot;
426	unsigned long want_v, hpte_v;
427
428	hash = hpt_hash(va, mmu_psize_defs[psize].shift);
429	want_v = hpte_encode_v(va, psize);
430
431	for (j = 0; j < 2; j++) {
432		slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
433		for (i = 0; i < HPTES_PER_GROUP; i++) {
434			hpte_v = pSeries_lpar_hpte_getword0(slot);
435
436			if (HPTE_V_COMPARE(hpte_v, want_v)
437			    && (hpte_v & HPTE_V_VALID)
438			    && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
439				/* HPTE matches */
440				if (j)
441					slot = -slot;
442				return slot;
443			}
444			++slot;
445		}
446		hash = ~hash;
447	}
448
449	return -1;
450}
451
452static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
453					     unsigned long ea,
454					     int psize)
455{
456	unsigned long lpar_rc, slot, vsid, va, flags;
457
458	vsid = get_kernel_vsid(ea);
459	va = (vsid << 28) | (ea & 0x0fffffff);
460
461	slot = pSeries_lpar_hpte_find(va, psize);
462	BUG_ON(slot == -1);
463
464	flags = newpp & 7;
465	lpar_rc = plpar_pte_protect(flags, slot, 0);
466
467	BUG_ON(lpar_rc != H_SUCCESS);
468}
469
470static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
471					 int psize, int local)
472{
473	unsigned long want_v;
474	unsigned long lpar_rc;
475	unsigned long dummy1, dummy2;
476
477	DBG_LOW("    inval : slot=%lx, va=%016lx, psize: %d, local: %d",
478		slot, va, psize, local);
479
480	want_v = hpte_encode_v(va, psize);
481	lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN,
482				   &dummy1, &dummy2);
483	if (lpar_rc == H_NOT_FOUND)
484		return;
485
486	BUG_ON(lpar_rc != H_SUCCESS);
487}
488
489/*
490 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
491 * lock.
492 */
493void pSeries_lpar_flush_hash_range(unsigned long number, int local)
494{
495	int i;
496	unsigned long flags = 0;
497	struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
498	int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
499
500	if (lock_tlbie)
501		spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
502
503	for (i = 0; i < number; i++)
504		flush_hash_page(batch->vaddr[i], batch->pte[i],
505				batch->psize, local);
506
507	if (lock_tlbie)
508		spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
509}
510
511void __init hpte_init_lpar(void)
512{
513	ppc_md.hpte_invalidate	= pSeries_lpar_hpte_invalidate;
514	ppc_md.hpte_updatepp	= pSeries_lpar_hpte_updatepp;
515	ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
516	ppc_md.hpte_insert	= pSeries_lpar_hpte_insert;
517	ppc_md.hpte_remove	= pSeries_lpar_hpte_remove;
518	ppc_md.flush_hash_range	= pSeries_lpar_flush_hash_range;
519	ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
520}
521