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/kernel.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/console.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/iommu.h>
35 #include <asm/tlbflush.h>
38 #include <asm/cputable.h>
42 #include "plpar_wrappers.h"
45 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
47 #define DBG_LOW(fmt...) do { } while(0)
51 EXPORT_SYMBOL(plpar_hcall);
52 EXPORT_SYMBOL(plpar_hcall9);
53 EXPORT_SYMBOL(plpar_hcall_norets);
55 extern void pSeries_find_serial_port(void);
58 int vtermno; /* virtual terminal# for udbg */
60 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
61 static void udbg_hvsi_putc(char c)
63 /* packet's seqno isn't used anyways */
64 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
71 rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
72 } while (rc == H_BUSY);
75 static long hvsi_udbg_buf_len;
76 static uint8_t hvsi_udbg_buf[256];
78 static int udbg_hvsi_getc_poll(void)
83 if (hvsi_udbg_buf_len == 0) {
84 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
85 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) {
86 /* bad read or non-data packet */
87 hvsi_udbg_buf_len = 0;
89 /* remove the packet header */
90 for (i = 4; i < hvsi_udbg_buf_len; i++)
91 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
92 hvsi_udbg_buf_len -= 4;
96 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
98 hvsi_udbg_buf_len = 0;
102 ch = hvsi_udbg_buf[0];
103 /* shift remaining data down */
104 for (i = 1; i < hvsi_udbg_buf_len; i++) {
105 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
112 static int udbg_hvsi_getc(void)
116 ch = udbg_hvsi_getc_poll();
118 /* This shouldn't be needed...but... */
119 volatile unsigned long delay;
120 for (delay=0; delay < 2000000; delay++)
128 static void udbg_putcLP(char c)
138 rc = plpar_put_term_char(vtermno, 1, buf);
139 } while(rc == H_BUSY);
142 /* Buffered chars getc */
143 static long inbuflen;
144 static long inbuf[2]; /* must be 2 longs */
146 static int udbg_getc_pollLP(void)
148 /* The interface is tricky because it may return up to 16 chars.
149 * We save them statically for future calls to udbg_getc().
151 char ch, *buf = (char *)inbuf;
155 /* get some more chars. */
157 rc = plpar_get_term_char(vtermno, &inbuflen, buf);
159 inbuflen = 0; /* otherwise inbuflen is garbage */
161 if (inbuflen <= 0 || inbuflen > 16) {
162 /* Catch error case as well as other oddities (corruption) */
167 for (i = 1; i < inbuflen; i++) /* shuffle them down. */
173 static int udbg_getcLP(void)
177 ch = udbg_getc_pollLP();
179 /* This shouldn't be needed...but... */
180 volatile unsigned long delay;
181 for (delay=0; delay < 2000000; delay++)
189 /* call this from early_init() for a working debug console on
190 * vterm capable LPAR machines
192 void __init udbg_init_debug_lpar(void)
195 udbg_putc = udbg_putcLP;
196 udbg_getc = udbg_getcLP;
197 udbg_getc_poll = udbg_getc_pollLP;
200 /* returns 0 if couldn't find or use /chosen/stdout as console */
201 void __init find_udbg_vterm(void)
203 struct device_node *stdout_node;
208 /* find the boot console from /chosen/stdout */
211 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
214 stdout_node = of_find_node_by_path(name);
217 name = of_get_property(stdout_node, "name", NULL);
219 printk(KERN_WARNING "stdout node missing 'name' property!\n");
222 /* The user has requested a console so this is already set up. */
223 add_console = !strstr(cmd_line, "console=");
225 /* Check if it's a virtual terminal */
226 if (strncmp(name, "vty", 3) != 0)
228 termno = of_get_property(stdout_node, "reg", NULL);
233 if (of_device_is_compatible(stdout_node, "hvterm1")) {
234 udbg_putc = udbg_putcLP;
235 udbg_getc = udbg_getcLP;
236 udbg_getc_poll = udbg_getc_pollLP;
238 add_preferred_console("hvc", termno[0] & 0xff, NULL);
239 } else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
241 udbg_putc = udbg_hvsi_putc;
242 udbg_getc = udbg_hvsi_getc;
243 udbg_getc_poll = udbg_hvsi_getc_poll;
245 add_preferred_console("hvsi", termno[0] & 0xff, NULL);
248 of_node_put(stdout_node);
251 void vpa_init(int cpu)
253 int hwcpu = get_hard_smp_processor_id(cpu);
257 if (cpu_has_feature(CPU_FTR_ALTIVEC))
258 lppaca[cpu].vmxregs_in_use = 1;
260 addr = __pa(&lppaca[cpu]);
261 ret = register_vpa(hwcpu, addr);
264 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
265 "cpu %d (hw %d) of area %lx returns %ld\n",
266 cpu, hwcpu, addr, ret);
270 * PAPR says this feature is SLB-Buffer but firmware never
271 * reports that. All SPLPAR support SLB shadow buffer.
273 addr = __pa(&slb_shadow[cpu]);
274 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
275 ret = register_slb_shadow(hwcpu, addr);
278 "WARNING: vpa_init: SLB shadow buffer "
279 "registration for cpu %d (hw %d) of area %lx "
280 "returns %ld\n", cpu, hwcpu, addr, ret);
284 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
285 unsigned long va, unsigned long pa,
286 unsigned long rflags, unsigned long vflags,
287 int psize, int ssize)
289 unsigned long lpar_rc;
292 unsigned long hpte_v, hpte_r;
294 if (!(vflags & HPTE_V_BOLTED))
295 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
296 "rflags=%lx, vflags=%lx, psize=%d)\n",
297 hpte_group, va, pa, rflags, vflags, psize);
299 hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID;
300 hpte_r = hpte_encode_r(pa, psize) | rflags;
302 if (!(vflags & HPTE_V_BOLTED))
303 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
305 /* Now fill in the actual HPTE */
306 /* Set CEC cookie to 0 */
308 /* I-cache Invalidate = 0 */
309 /* I-cache synchronize = 0 */
313 /* Make pHyp happy */
314 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
315 hpte_r &= ~_PAGE_COHERENT;
317 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
318 if (unlikely(lpar_rc == H_PTEG_FULL)) {
319 if (!(vflags & HPTE_V_BOLTED))
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.
329 if (unlikely(lpar_rc != H_SUCCESS)) {
330 if (!(vflags & HPTE_V_BOLTED))
331 DBG_LOW(" lpar err %d\n", lpar_rc);
334 if (!(vflags & HPTE_V_BOLTED))
335 DBG_LOW(" -> slot: %d\n", slot & 7);
337 /* Because of iSeries, we have to pass down the secondary
338 * bucket bit here as well
340 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
343 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
345 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
347 unsigned long slot_offset;
348 unsigned long lpar_rc;
350 unsigned long dummy1, dummy2;
352 /* pick a random slot to start at */
353 slot_offset = mftb() & 0x7;
355 for (i = 0; i < HPTES_PER_GROUP; i++) {
357 /* don't remove a bolted entry */
358 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
359 (0x1UL << 4), &dummy1, &dummy2);
360 if (lpar_rc == H_SUCCESS)
362 BUG_ON(lpar_rc != H_NOT_FOUND);
371 static void pSeries_lpar_hptab_clear(void)
373 unsigned long size_bytes = 1UL << ppc64_pft_size;
374 unsigned long hpte_count = size_bytes >> 4;
375 unsigned long dummy1, dummy2, dword0;
379 /* TODO: Use bulk call */
380 for (i = 0; i < hpte_count; i++) {
381 /* dont remove HPTEs with VRMA mappings */
382 lpar_rc = plpar_pte_remove_raw(H_ANDCOND, i, HPTE_V_1TB_SEG,
384 if (lpar_rc == H_NOT_FOUND) {
385 lpar_rc = plpar_pte_read_raw(0, i, &dword0, &dummy1);
386 if (!lpar_rc && ((dword0 & HPTE_V_VRMA_MASK)
387 != HPTE_V_VRMA_MASK))
388 /* Can be hpte for 1TB Seg. So remove it */
389 plpar_pte_remove_raw(0, i, 0, &dummy1, &dummy2);
395 * This computes the AVPN and B fields of the first dword of a HPTE,
396 * for use when we want to match an existing PTE. The bottom 7 bits
397 * of the returned value are zero.
399 static inline unsigned long hpte_encode_avpn(unsigned long va, int psize,
404 v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm);
405 v <<= HPTE_V_AVPN_SHIFT;
406 v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT;
411 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
412 * the low 3 bits of flags happen to line up. So no transform is needed.
413 * We can probably optimize here and assume the high bits of newpp are
414 * already zero. For now I am paranoid.
416 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
419 int psize, int ssize, int local)
421 unsigned long lpar_rc;
422 unsigned long flags = (newpp & 7) | H_AVPN;
423 unsigned long want_v;
425 want_v = hpte_encode_avpn(va, psize, ssize);
427 DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
428 want_v, slot, flags, psize);
430 lpar_rc = plpar_pte_protect(flags, slot, want_v);
432 if (lpar_rc == H_NOT_FOUND) {
433 DBG_LOW("not found !\n");
439 BUG_ON(lpar_rc != H_SUCCESS);
444 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
446 unsigned long dword0;
447 unsigned long lpar_rc;
448 unsigned long dummy_word1;
451 /* Read 1 pte at a time */
452 /* Do not need RPN to logical page translation */
453 /* No cross CEC PFT access */
456 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
458 BUG_ON(lpar_rc != H_SUCCESS);
463 static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize)
468 unsigned long want_v, hpte_v;
470 hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize);
471 want_v = hpte_encode_avpn(va, psize, ssize);
473 /* Bolted entries are always in the primary group */
474 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
475 for (i = 0; i < HPTES_PER_GROUP; i++) {
476 hpte_v = pSeries_lpar_hpte_getword0(slot);
478 if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
487 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
489 int psize, int ssize)
491 unsigned long lpar_rc, slot, vsid, va, flags;
493 vsid = get_kernel_vsid(ea, ssize);
494 va = hpt_va(ea, vsid, ssize);
496 slot = pSeries_lpar_hpte_find(va, psize, ssize);
500 lpar_rc = plpar_pte_protect(flags, slot, 0);
502 BUG_ON(lpar_rc != H_SUCCESS);
505 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
506 int psize, int ssize, int local)
508 unsigned long want_v;
509 unsigned long lpar_rc;
510 unsigned long dummy1, dummy2;
512 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d",
513 slot, va, psize, local);
515 want_v = hpte_encode_avpn(va, psize, ssize);
516 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
517 if (lpar_rc == H_NOT_FOUND)
520 BUG_ON(lpar_rc != H_SUCCESS);
523 /* Flag bits for H_BULK_REMOVE */
524 #define HBR_REQUEST 0x4000000000000000UL
525 #define HBR_RESPONSE 0x8000000000000000UL
526 #define HBR_END 0xc000000000000000UL
527 #define HBR_AVPN 0x0200000000000000UL
528 #define HBR_ANDCOND 0x0100000000000000UL
531 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
534 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
536 unsigned long i, pix, rc;
537 unsigned long flags = 0;
538 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
539 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
540 unsigned long param[9];
542 unsigned long hash, index, shift, hidx, slot;
547 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
549 psize = batch->psize;
550 ssize = batch->ssize;
552 for (i = 0; i < number; i++) {
553 va = batch->vaddr[i];
555 pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
556 hash = hpt_hash(va, shift, ssize);
557 hidx = __rpte_to_hidx(pte, index);
558 if (hidx & _PTEIDX_SECONDARY)
560 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
561 slot += hidx & _PTEIDX_GROUP_IX;
562 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
563 pSeries_lpar_hpte_invalidate(slot, va, psize,
566 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
567 param[pix+1] = hpte_encode_avpn(va, psize,
571 rc = plpar_hcall9(H_BULK_REMOVE, param,
572 param[0], param[1], param[2],
573 param[3], param[4], param[5],
575 BUG_ON(rc != H_SUCCESS);
579 } pte_iterate_hashed_end();
582 param[pix] = HBR_END;
583 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
584 param[2], param[3], param[4], param[5],
586 BUG_ON(rc != H_SUCCESS);
590 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
593 void __init hpte_init_lpar(void)
595 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
596 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
597 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
598 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
599 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
600 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
601 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;