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/abs_addr.h>
39 #include <asm/cputable.h>
43 #include "plpar_wrappers.h"
46 #define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
48 #define DBG_LOW(fmt...) do { } while(0)
51 /* in pSeries_hvCall.S */
52 EXPORT_SYMBOL(plpar_hcall);
53 EXPORT_SYMBOL(plpar_hcall_4out);
54 EXPORT_SYMBOL(plpar_hcall_norets);
55 EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
56 EXPORT_SYMBOL(plpar_hcall_7arg_7ret);
57 EXPORT_SYMBOL(plpar_hcall_9arg_9ret);
58 extern void pSeries_find_serial_port(void);
61 int vtermno; /* virtual terminal# for udbg */
63 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
64 static void udbg_hvsi_putc(char c)
66 /* packet's seqno isn't used anyways */
67 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
74 rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
75 } while (rc == H_BUSY);
78 static long hvsi_udbg_buf_len;
79 static uint8_t hvsi_udbg_buf[256];
81 static int udbg_hvsi_getc_poll(void)
86 if (hvsi_udbg_buf_len == 0) {
87 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
88 if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) {
89 /* bad read or non-data packet */
90 hvsi_udbg_buf_len = 0;
92 /* remove the packet header */
93 for (i = 4; i < hvsi_udbg_buf_len; i++)
94 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
95 hvsi_udbg_buf_len -= 4;
99 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
101 hvsi_udbg_buf_len = 0;
105 ch = hvsi_udbg_buf[0];
106 /* shift remaining data down */
107 for (i = 1; i < hvsi_udbg_buf_len; i++) {
108 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
115 static int udbg_hvsi_getc(void)
119 ch = udbg_hvsi_getc_poll();
121 /* This shouldn't be needed...but... */
122 volatile unsigned long delay;
123 for (delay=0; delay < 2000000; delay++)
131 static void udbg_putcLP(char c)
141 rc = plpar_put_term_char(vtermno, 1, buf);
142 } while(rc == H_BUSY);
145 /* Buffered chars getc */
146 static long inbuflen;
147 static long inbuf[2]; /* must be 2 longs */
149 static int udbg_getc_pollLP(void)
151 /* The interface is tricky because it may return up to 16 chars.
152 * We save them statically for future calls to udbg_getc().
154 char ch, *buf = (char *)inbuf;
158 /* get some more chars. */
160 rc = plpar_get_term_char(vtermno, &inbuflen, buf);
162 inbuflen = 0; /* otherwise inbuflen is garbage */
164 if (inbuflen <= 0 || inbuflen > 16) {
165 /* Catch error case as well as other oddities (corruption) */
170 for (i = 1; i < inbuflen; i++) /* shuffle them down. */
176 static int udbg_getcLP(void)
180 ch = udbg_getc_pollLP();
182 /* This shouldn't be needed...but... */
183 volatile unsigned long delay;
184 for (delay=0; delay < 2000000; delay++)
192 /* call this from early_init() for a working debug console on
193 * vterm capable LPAR machines
195 void __init udbg_init_debug_lpar(void)
198 udbg_putc = udbg_putcLP;
199 udbg_getc = udbg_getcLP;
200 udbg_getc_poll = udbg_getc_pollLP;
203 /* returns 0 if couldn't find or use /chosen/stdout as console */
204 void __init find_udbg_vterm(void)
206 struct device_node *stdout_node;
211 /* find the boot console from /chosen/stdout */
214 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
217 stdout_node = of_find_node_by_path(name);
220 name = (char *)get_property(stdout_node, "name", NULL);
222 printk(KERN_WARNING "stdout node missing 'name' property!\n");
225 /* The user has requested a console so this is already set up. */
226 add_console = !strstr(cmd_line, "console=");
228 /* Check if it's a virtual terminal */
229 if (strncmp(name, "vty", 3) != 0)
231 termno = (u32 *)get_property(stdout_node, "reg", NULL);
236 if (device_is_compatible(stdout_node, "hvterm1")) {
237 udbg_putc = udbg_putcLP;
238 udbg_getc = udbg_getcLP;
239 udbg_getc_poll = udbg_getc_pollLP;
241 add_preferred_console("hvc", termno[0] & 0xff, NULL);
242 } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
244 udbg_putc = udbg_hvsi_putc;
245 udbg_getc = udbg_hvsi_getc;
246 udbg_getc_poll = udbg_hvsi_getc_poll;
248 add_preferred_console("hvsi", termno[0] & 0xff, NULL);
251 of_node_put(stdout_node);
254 void vpa_init(int cpu)
256 int hwcpu = get_hard_smp_processor_id(cpu);
257 unsigned long vpa = __pa(&lppaca[cpu]);
260 if (cpu_has_feature(CPU_FTR_ALTIVEC))
261 lppaca[cpu].vmxregs_in_use = 1;
263 ret = register_vpa(hwcpu, vpa);
266 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
267 "cpu %d (hw %d) of area %lx returns %ld\n",
268 cpu, hwcpu, vpa, ret);
271 long pSeries_lpar_hpte_insert(unsigned long hpte_group,
272 unsigned long va, unsigned long pa,
273 unsigned long rflags, unsigned long vflags,
276 unsigned long lpar_rc;
279 unsigned long hpte_v, hpte_r;
280 unsigned long dummy0, dummy1;
282 if (!(vflags & HPTE_V_BOLTED))
283 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
284 "rflags=%lx, vflags=%lx, psize=%d)\n",
285 hpte_group, va, pa, rflags, vflags, psize);
287 hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
288 hpte_r = hpte_encode_r(pa, psize) | rflags;
290 if (!(vflags & HPTE_V_BOLTED))
291 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
293 /* Now fill in the actual HPTE */
294 /* Set CEC cookie to 0 */
296 /* I-cache Invalidate = 0 */
297 /* I-cache synchronize = 0 */
301 /* Make pHyp happy */
302 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
303 hpte_r &= ~_PAGE_COHERENT;
305 lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v,
306 hpte_r, &slot, &dummy0, &dummy1);
307 if (unlikely(lpar_rc == H_PTEG_FULL)) {
308 if (!(vflags & HPTE_V_BOLTED))
314 * Since we try and ioremap PHBs we don't own, the pte insert
315 * will fail. However we must catch the failure in hash_page
316 * or we will loop forever, so return -2 in this case.
318 if (unlikely(lpar_rc != H_SUCCESS)) {
319 if (!(vflags & HPTE_V_BOLTED))
320 DBG_LOW(" lpar err %d\n", lpar_rc);
323 if (!(vflags & HPTE_V_BOLTED))
324 DBG_LOW(" -> slot: %d\n", slot & 7);
326 /* Because of iSeries, we have to pass down the secondary
327 * bucket bit here as well
329 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
332 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
334 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
336 unsigned long slot_offset;
337 unsigned long lpar_rc;
339 unsigned long dummy1, dummy2;
341 /* pick a random slot to start at */
342 slot_offset = mftb() & 0x7;
344 for (i = 0; i < HPTES_PER_GROUP; i++) {
346 /* don't remove a bolted entry */
347 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
348 (0x1UL << 4), &dummy1, &dummy2);
349 if (lpar_rc == H_SUCCESS)
351 BUG_ON(lpar_rc != H_NOT_FOUND);
360 static void pSeries_lpar_hptab_clear(void)
362 unsigned long size_bytes = 1UL << ppc64_pft_size;
363 unsigned long hpte_count = size_bytes >> 4;
364 unsigned long dummy1, dummy2;
367 /* TODO: Use bulk call */
368 for (i = 0; i < hpte_count; i++)
369 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
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.
378 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
381 int psize, int local)
383 unsigned long lpar_rc;
384 unsigned long flags = (newpp & 7) | H_AVPN;
385 unsigned long want_v;
387 want_v = hpte_encode_v(va, psize);
389 DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
390 want_v & HPTE_V_AVPN, slot, flags, psize);
392 lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN);
394 if (lpar_rc == H_NOT_FOUND) {
395 DBG_LOW("not found !\n");
401 BUG_ON(lpar_rc != H_SUCCESS);
406 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
408 unsigned long dword0;
409 unsigned long lpar_rc;
410 unsigned long dummy_word1;
413 /* Read 1 pte at a time */
414 /* Do not need RPN to logical page translation */
415 /* No cross CEC PFT access */
418 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
420 BUG_ON(lpar_rc != H_SUCCESS);
425 static long pSeries_lpar_hpte_find(unsigned long va, int psize)
430 unsigned long want_v, hpte_v;
432 hash = hpt_hash(va, mmu_psize_defs[psize].shift);
433 want_v = hpte_encode_v(va, psize);
435 for (j = 0; j < 2; j++) {
436 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
437 for (i = 0; i < HPTES_PER_GROUP; i++) {
438 hpte_v = pSeries_lpar_hpte_getword0(slot);
440 if (HPTE_V_COMPARE(hpte_v, want_v)
441 && (hpte_v & HPTE_V_VALID)
442 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
456 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
460 unsigned long lpar_rc, slot, vsid, va, flags;
462 vsid = get_kernel_vsid(ea);
463 va = (vsid << 28) | (ea & 0x0fffffff);
465 slot = pSeries_lpar_hpte_find(va, psize);
469 lpar_rc = plpar_pte_protect(flags, slot, 0);
471 BUG_ON(lpar_rc != H_SUCCESS);
474 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
475 int psize, int local)
477 unsigned long want_v;
478 unsigned long lpar_rc;
479 unsigned long dummy1, dummy2;
481 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d",
482 slot, va, psize, local);
484 want_v = hpte_encode_v(va, psize);
485 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN,
487 if (lpar_rc == H_NOT_FOUND)
490 BUG_ON(lpar_rc != H_SUCCESS);
494 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
497 void pSeries_lpar_flush_hash_range(unsigned long number, int local)
500 unsigned long flags = 0;
501 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
502 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
505 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
507 for (i = 0; i < number; i++)
508 flush_hash_page(batch->vaddr[i], batch->pte[i],
509 batch->psize, local);
512 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
515 void __init hpte_init_lpar(void)
517 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
518 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
519 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
520 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
521 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
522 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
523 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;