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 <linux/console.h>
28 #include <asm/processor.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>
39 #include <asm/abs_addr.h>
40 #include <asm/cputable.h>
44 #include "plpar_wrappers.h"
47 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
49 #define DBG_LOW(fmt...) do { } while(0)
52 /* in pSeries_hvCall.S */
53 EXPORT_SYMBOL(plpar_hcall);
54 EXPORT_SYMBOL(plpar_hcall_4out);
55 EXPORT_SYMBOL(plpar_hcall_norets);
56 EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
57 EXPORT_SYMBOL(plpar_hcall_7arg_7ret);
58 EXPORT_SYMBOL(plpar_hcall_9arg_9ret);
59 extern void pSeries_find_serial_port(void);
62 int vtermno; /* virtual terminal# for udbg */
64 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
65 static void udbg_hvsi_putc(char c)
67 /* packet's seqno isn't used anyways */
68 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
75 rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
76 } while (rc == H_BUSY);
79 static long hvsi_udbg_buf_len;
80 static uint8_t hvsi_udbg_buf[256];
82 static int udbg_hvsi_getc_poll(void)
87 if (hvsi_udbg_buf_len == 0) {
88 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
89 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) {
90 /* bad read or non-data packet */
91 hvsi_udbg_buf_len = 0;
93 /* remove the packet header */
94 for (i = 4; i < hvsi_udbg_buf_len; i++)
95 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
96 hvsi_udbg_buf_len -= 4;
100 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
102 hvsi_udbg_buf_len = 0;
106 ch = hvsi_udbg_buf[0];
107 /* shift remaining data down */
108 for (i = 1; i < hvsi_udbg_buf_len; i++) {
109 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
116 static int udbg_hvsi_getc(void)
120 ch = udbg_hvsi_getc_poll();
122 /* This shouldn't be needed...but... */
123 volatile unsigned long delay;
124 for (delay=0; delay < 2000000; delay++)
132 static void udbg_putcLP(char c)
142 rc = plpar_put_term_char(vtermno, 1, buf);
143 } while(rc == H_BUSY);
146 /* Buffered chars getc */
147 static long inbuflen;
148 static long inbuf[2]; /* must be 2 longs */
150 static int udbg_getc_pollLP(void)
152 /* The interface is tricky because it may return up to 16 chars.
153 * We save them statically for future calls to udbg_getc().
155 char ch, *buf = (char *)inbuf;
159 /* get some more chars. */
161 rc = plpar_get_term_char(vtermno, &inbuflen, buf);
163 inbuflen = 0; /* otherwise inbuflen is garbage */
165 if (inbuflen <= 0 || inbuflen > 16) {
166 /* Catch error case as well as other oddities (corruption) */
171 for (i = 1; i < inbuflen; i++) /* shuffle them down. */
177 static int udbg_getcLP(void)
181 ch = udbg_getc_pollLP();
183 /* This shouldn't be needed...but... */
184 volatile unsigned long delay;
185 for (delay=0; delay < 2000000; delay++)
193 /* call this from early_init() for a working debug console on
194 * vterm capable LPAR machines
196 void __init udbg_init_debug_lpar(void)
199 udbg_putc = udbg_putcLP;
200 udbg_getc = udbg_getcLP;
201 udbg_getc_poll = udbg_getc_pollLP;
204 /* returns 0 if couldn't find or use /chosen/stdout as console */
205 void __init find_udbg_vterm(void)
207 struct device_node *stdout_node;
212 /* find the boot console from /chosen/stdout */
215 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
218 stdout_node = of_find_node_by_path(name);
221 name = (char *)get_property(stdout_node, "name", NULL);
223 printk(KERN_WARNING "stdout node missing 'name' property!\n");
226 /* The user has requested a console so this is already set up. */
227 add_console = !strstr(cmd_line, "console=");
229 /* Check if it's a virtual terminal */
230 if (strncmp(name, "vty", 3) != 0)
232 termno = (u32 *)get_property(stdout_node, "reg", NULL);
237 if (device_is_compatible(stdout_node, "hvterm1")) {
238 udbg_putc = udbg_putcLP;
239 udbg_getc = udbg_getcLP;
240 udbg_getc_poll = udbg_getc_pollLP;
242 add_preferred_console("hvc", termno[0] & 0xff, NULL);
243 } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
245 udbg_putc = udbg_hvsi_putc;
246 udbg_getc = udbg_hvsi_getc;
247 udbg_getc_poll = udbg_hvsi_getc_poll;
249 add_preferred_console("hvsi", termno[0] & 0xff, NULL);
252 of_node_put(stdout_node);
255 void vpa_init(int cpu)
257 int hwcpu = get_hard_smp_processor_id(cpu);
258 unsigned long vpa = __pa(&lppaca[cpu]);
261 if (cpu_has_feature(CPU_FTR_ALTIVEC))
262 lppaca[cpu].vmxregs_in_use = 1;
264 ret = register_vpa(hwcpu, vpa);
267 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
268 "cpu %d (hw %d) of area %lx returns %ld\n",
269 cpu, hwcpu, vpa, ret);
272 long pSeries_lpar_hpte_insert(unsigned long hpte_group,
273 unsigned long va, unsigned long pa,
274 unsigned long rflags, unsigned long vflags,
277 unsigned long lpar_rc;
280 unsigned long hpte_v, hpte_r;
281 unsigned long dummy0, dummy1;
283 if (!(vflags & HPTE_V_BOLTED))
284 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
285 "rflags=%lx, vflags=%lx, psize=%d)\n",
286 hpte_group, va, pa, rflags, vflags, psize);
288 hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
289 hpte_r = hpte_encode_r(pa, psize) | rflags;
291 if (!(vflags & HPTE_V_BOLTED))
292 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
294 /* Now fill in the actual HPTE */
295 /* Set CEC cookie to 0 */
297 /* I-cache Invalidate = 0 */
298 /* I-cache synchronize = 0 */
302 /* Make pHyp happy */
303 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
304 hpte_r &= ~_PAGE_COHERENT;
306 lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v,
307 hpte_r, &slot, &dummy0, &dummy1);
308 if (unlikely(lpar_rc == H_PTEG_FULL)) {
309 if (!(vflags & HPTE_V_BOLTED))
315 * Since we try and ioremap PHBs we don't own, the pte insert
316 * will fail. However we must catch the failure in hash_page
317 * or we will loop forever, so return -2 in this case.
319 if (unlikely(lpar_rc != H_SUCCESS)) {
320 if (!(vflags & HPTE_V_BOLTED))
321 DBG_LOW(" lpar err %d\n", lpar_rc);
324 if (!(vflags & HPTE_V_BOLTED))
325 DBG_LOW(" -> slot: %d\n", slot & 7);
327 /* Because of iSeries, we have to pass down the secondary
328 * bucket bit here as well
330 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
333 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
335 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
337 unsigned long slot_offset;
338 unsigned long lpar_rc;
340 unsigned long dummy1, dummy2;
342 /* pick a random slot to start at */
343 slot_offset = mftb() & 0x7;
345 for (i = 0; i < HPTES_PER_GROUP; i++) {
347 /* don't remove a bolted entry */
348 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
349 (0x1UL << 4), &dummy1, &dummy2);
350 if (lpar_rc == H_SUCCESS)
352 BUG_ON(lpar_rc != H_NOT_FOUND);
361 static void pSeries_lpar_hptab_clear(void)
363 unsigned long size_bytes = 1UL << ppc64_pft_size;
364 unsigned long hpte_count = size_bytes >> 4;
365 unsigned long dummy1, dummy2;
368 /* TODO: Use bulk call */
369 for (i = 0; i < hpte_count; i++)
370 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
374 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
375 * the low 3 bits of flags happen to line up. So no transform is needed.
376 * We can probably optimize here and assume the high bits of newpp are
377 * already zero. For now I am paranoid.
379 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
382 int psize, int local)
384 unsigned long lpar_rc;
385 unsigned long flags = (newpp & 7) | H_AVPN;
386 unsigned long want_v;
388 want_v = hpte_encode_v(va, psize);
390 DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
391 want_v & HPTE_V_AVPN, slot, flags, psize);
393 lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN);
395 if (lpar_rc == H_NOT_FOUND) {
396 DBG_LOW("not found !\n");
402 BUG_ON(lpar_rc != H_SUCCESS);
407 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
409 unsigned long dword0;
410 unsigned long lpar_rc;
411 unsigned long dummy_word1;
414 /* Read 1 pte at a time */
415 /* Do not need RPN to logical page translation */
416 /* No cross CEC PFT access */
419 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
421 BUG_ON(lpar_rc != H_SUCCESS);
426 static long pSeries_lpar_hpte_find(unsigned long va, int psize)
431 unsigned long want_v, hpte_v;
433 hash = hpt_hash(va, mmu_psize_defs[psize].shift);
434 want_v = hpte_encode_v(va, psize);
436 for (j = 0; j < 2; j++) {
437 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
438 for (i = 0; i < HPTES_PER_GROUP; i++) {
439 hpte_v = pSeries_lpar_hpte_getword0(slot);
441 if (HPTE_V_COMPARE(hpte_v, want_v)
442 && (hpte_v & HPTE_V_VALID)
443 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
457 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
461 unsigned long lpar_rc, slot, vsid, va, flags;
463 vsid = get_kernel_vsid(ea);
464 va = (vsid << 28) | (ea & 0x0fffffff);
466 slot = pSeries_lpar_hpte_find(va, psize);
470 lpar_rc = plpar_pte_protect(flags, slot, 0);
472 BUG_ON(lpar_rc != H_SUCCESS);
475 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
476 int psize, int local)
478 unsigned long want_v;
479 unsigned long lpar_rc;
480 unsigned long dummy1, dummy2;
482 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d",
483 slot, va, psize, local);
485 want_v = hpte_encode_v(va, psize);
486 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN,
488 if (lpar_rc == H_NOT_FOUND)
491 BUG_ON(lpar_rc != H_SUCCESS);
495 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
498 void pSeries_lpar_flush_hash_range(unsigned long number, int local)
501 unsigned long flags = 0;
502 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
503 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
506 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
508 for (i = 0; i < number; i++)
509 flush_hash_page(batch->vaddr[i], batch->pte[i],
510 batch->psize, local);
513 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
516 void hpte_init_lpar(void)
518 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
519 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
520 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
521 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
522 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
523 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
524 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;