3 * Copyright (C) 2001 Todd Inglett, IBM Corporation
5 * pSeries LPAR support.
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.
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.
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
24 #include <linux/config.h>
25 #include <linux/kernel.h>
26 #include <linux/dma-mapping.h>
27 #include <asm/processor.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>
37 #include <asm/tlbflush.h>
40 #include <asm/abs_addr.h>
41 #include <asm/cputable.h>
42 #include <asm/plpar_wrappers.h>
45 #define DBG(fmt...) udbg_printf(fmt)
50 /* in pSeries_hvCall.S */
51 EXPORT_SYMBOL(plpar_hcall);
52 EXPORT_SYMBOL(plpar_hcall_4out);
53 EXPORT_SYMBOL(plpar_hcall_norets);
54 EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
56 extern void fw_feature_init(void);
57 extern void pSeries_find_serial_port(void);
60 int vtermno; /* virtual terminal# for udbg */
62 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
63 static void udbg_hvsi_putc(unsigned char c)
65 /* packet's seqno isn't used anyways */
66 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
73 rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
74 } while (rc == H_Busy);
77 static long hvsi_udbg_buf_len;
78 static uint8_t hvsi_udbg_buf[256];
80 static int udbg_hvsi_getc_poll(void)
85 if (hvsi_udbg_buf_len == 0) {
86 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
87 if (rc != H_Success || hvsi_udbg_buf[0] != 0xff) {
88 /* bad read or non-data packet */
89 hvsi_udbg_buf_len = 0;
91 /* remove the packet header */
92 for (i = 4; i < hvsi_udbg_buf_len; i++)
93 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
94 hvsi_udbg_buf_len -= 4;
98 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
100 hvsi_udbg_buf_len = 0;
104 ch = hvsi_udbg_buf[0];
105 /* shift remaining data down */
106 for (i = 1; i < hvsi_udbg_buf_len; i++) {
107 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
114 static unsigned char udbg_hvsi_getc(void)
118 ch = udbg_hvsi_getc_poll();
120 /* This shouldn't be needed...but... */
121 volatile unsigned long delay;
122 for (delay=0; delay < 2000000; delay++)
130 static void udbg_putcLP(unsigned char c)
140 rc = plpar_put_term_char(vtermno, 1, buf);
141 } while(rc == H_Busy);
144 /* Buffered chars getc */
145 static long inbuflen;
146 static long inbuf[2]; /* must be 2 longs */
148 static int udbg_getc_pollLP(void)
150 /* The interface is tricky because it may return up to 16 chars.
151 * We save them statically for future calls to udbg_getc().
153 char ch, *buf = (char *)inbuf;
157 /* get some more chars. */
159 rc = plpar_get_term_char(vtermno, &inbuflen, buf);
161 inbuflen = 0; /* otherwise inbuflen is garbage */
163 if (inbuflen <= 0 || inbuflen > 16) {
164 /* Catch error case as well as other oddities (corruption) */
169 for (i = 1; i < inbuflen; i++) /* shuffle them down. */
175 static unsigned char udbg_getcLP(void)
179 ch = udbg_getc_pollLP();
181 /* This shouldn't be needed...but... */
182 volatile unsigned long delay;
183 for (delay=0; delay < 2000000; delay++)
191 /* call this from early_init() for a working debug console on
192 * vterm capable LPAR machines
194 void udbg_init_debug_lpar(void)
197 ppc_md.udbg_putc = udbg_putcLP;
198 ppc_md.udbg_getc = udbg_getcLP;
199 ppc_md.udbg_getc_poll = udbg_getc_pollLP;
202 /* returns 0 if couldn't find or use /chosen/stdout as console */
203 int find_udbg_vterm(void)
205 struct device_node *stdout_node;
210 /* find the boot console from /chosen/stdout */
213 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
216 stdout_node = of_find_node_by_path(name);
220 /* now we have the stdout node; figure out what type of device it is. */
221 name = (char *)get_property(stdout_node, "name", NULL);
223 printk(KERN_WARNING "stdout node missing 'name' property!\n");
227 if (strncmp(name, "vty", 3) == 0) {
228 if (device_is_compatible(stdout_node, "hvterm1")) {
229 termno = (u32 *)get_property(stdout_node, "reg", NULL);
232 ppc_md.udbg_putc = udbg_putcLP;
233 ppc_md.udbg_getc = udbg_getcLP;
234 ppc_md.udbg_getc_poll = udbg_getc_pollLP;
237 } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
238 termno = (u32 *)get_property(stdout_node, "reg", NULL);
241 ppc_md.udbg_putc = udbg_hvsi_putc;
242 ppc_md.udbg_getc = udbg_hvsi_getc;
243 ppc_md.udbg_getc_poll = udbg_hvsi_getc_poll;
247 } else if (strncmp(name, "serial", 6)) {
248 /* XXX fix ISA serial console */
249 printk(KERN_WARNING "serial stdout on LPAR ('%s')! "
250 "can't print udbg messages\n",
251 stdout_node->full_name);
253 printk(KERN_WARNING "don't know how to print to stdout '%s'\n",
254 stdout_node->full_name);
258 of_node_put(stdout_node);
263 long pSeries_lpar_hpte_insert(unsigned long hpte_group,
264 unsigned long va, unsigned long prpn,
265 int secondary, unsigned long hpteflags,
266 int bolted, int large)
268 unsigned long arpn = physRpn_to_absRpn(prpn);
269 unsigned long lpar_rc;
273 unsigned long dummy0, dummy1;
275 /* Fill in the local HPTE with absolute rpn, avpn and flags */
276 lhpte.dw1.dword1 = 0;
277 lhpte.dw1.dw1.rpn = arpn;
278 lhpte.dw1.flags.flags = hpteflags;
280 lhpte.dw0.dword0 = 0;
281 lhpte.dw0.dw0.avpn = va >> 23;
282 lhpte.dw0.dw0.h = secondary;
283 lhpte.dw0.dw0.bolted = bolted;
288 lhpte.dw0.dw0.avpn &= ~0x1UL;
291 /* Now fill in the actual HPTE */
292 /* Set CEC cookie to 0 */
294 /* I-cache Invalidate = 0 */
295 /* I-cache synchronize = 0 */
299 /* XXX why is this here? - Anton */
300 if (hpteflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
301 lhpte.dw1.flags.flags &= ~_PAGE_COHERENT;
303 lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, lhpte.dw0.dword0,
304 lhpte.dw1.dword1, &slot, &dummy0, &dummy1);
306 if (unlikely(lpar_rc == H_PTEG_Full))
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.
314 if (unlikely(lpar_rc != H_Success))
317 /* Because of iSeries, we have to pass down the secondary
318 * bucket bit here as well
320 return (slot & 7) | (secondary << 3);
323 static spinlock_t pSeries_lpar_tlbie_lock = SPIN_LOCK_UNLOCKED;
325 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
327 unsigned long slot_offset;
328 unsigned long lpar_rc;
330 unsigned long dummy1, dummy2;
332 /* pick a random slot to start at */
333 slot_offset = mftb() & 0x7;
335 for (i = 0; i < HPTES_PER_GROUP; i++) {
337 /* don't remove a bolted entry */
338 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
339 (0x1UL << 4), &dummy1, &dummy2);
341 if (lpar_rc == H_Success)
344 BUG_ON(lpar_rc != H_Not_Found);
353 static void pSeries_lpar_hptab_clear(void)
355 unsigned long size_bytes = 1UL << naca->pftSize;
356 unsigned long hpte_count = size_bytes >> 4;
357 unsigned long dummy1, dummy2;
360 /* TODO: Use bulk call */
361 for (i = 0; i < hpte_count; i++)
362 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
366 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
367 * the low 3 bits of flags happen to line up. So no transform is needed.
368 * We can probably optimize here and assume the high bits of newpp are
369 * already zero. For now I am paranoid.
371 static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
372 unsigned long va, int large, int local)
374 unsigned long lpar_rc;
375 unsigned long flags = (newpp & 7) | H_AVPN;
376 unsigned long avpn = va >> 23;
381 lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
383 if (lpar_rc == H_Not_Found)
386 BUG_ON(lpar_rc != H_Success);
391 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
393 unsigned long dword0;
394 unsigned long lpar_rc;
395 unsigned long dummy_word1;
398 /* Read 1 pte at a time */
399 /* Do not need RPN to logical page translation */
400 /* No cross CEC PFT access */
403 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
405 BUG_ON(lpar_rc != H_Success);
410 static long pSeries_lpar_hpte_find(unsigned long vpn)
416 unsigned long dword0;
421 hash = hpt_hash(vpn, 0);
423 for (j = 0; j < 2; j++) {
424 slot = (hash & htab_data.htab_hash_mask) * HPTES_PER_GROUP;
425 for (i = 0; i < HPTES_PER_GROUP; i++) {
426 hpte_dw0.dword0 = pSeries_lpar_hpte_getword0(slot);
429 if ((dw0.avpn == (vpn >> 11)) && dw0.v &&
444 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
447 unsigned long lpar_rc;
448 unsigned long vsid, va, vpn, flags;
451 vsid = get_kernel_vsid(ea);
452 va = (vsid << 28) | (ea & 0x0fffffff);
453 vpn = va >> PAGE_SHIFT;
455 slot = pSeries_lpar_hpte_find(vpn);
459 lpar_rc = plpar_pte_protect(flags, slot, 0);
461 BUG_ON(lpar_rc != H_Success);
464 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
465 int large, int local)
467 unsigned long avpn = va >> 23;
468 unsigned long lpar_rc;
469 unsigned long dummy1, dummy2;
474 lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
477 if (lpar_rc == H_Not_Found)
480 BUG_ON(lpar_rc != H_Success);
484 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
487 void pSeries_lpar_flush_hash_range(unsigned long context, unsigned long number,
492 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
493 int lock_tlbie = !(cur_cpu_spec->cpu_features & CPU_FTR_LOCKLESS_TLBIE);
496 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
498 for (i = 0; i < number; i++)
499 flush_hash_page(context, batch->addr[i], batch->pte[i], local);
502 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
505 void hpte_init_lpar(void)
507 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
508 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
509 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
510 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
511 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
512 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
513 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;