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);
262 void vpa_init(int cpu)
264 int hwcpu = get_hard_smp_processor_id(cpu);
265 unsigned long vpa = (unsigned long)&(paca[cpu].lppaca);
269 /* Register the Virtual Processor Area (VPA) */
270 flags = 1UL << (63 - 18);
271 ret = register_vpa(flags, hwcpu, __pa(vpa));
274 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
275 "cpu %d (hw %d) of area %lx returns %ld\n",
276 cpu, hwcpu, __pa(vpa), ret);
279 long pSeries_lpar_hpte_insert(unsigned long hpte_group,
280 unsigned long va, unsigned long prpn,
281 int secondary, unsigned long hpteflags,
282 int bolted, int large)
284 unsigned long arpn = physRpn_to_absRpn(prpn);
285 unsigned long lpar_rc;
289 unsigned long dummy0, dummy1;
291 /* Fill in the local HPTE with absolute rpn, avpn and flags */
292 lhpte.dw1.dword1 = 0;
293 lhpte.dw1.dw1.rpn = arpn;
294 lhpte.dw1.flags.flags = hpteflags;
296 lhpte.dw0.dword0 = 0;
297 lhpte.dw0.dw0.avpn = va >> 23;
298 lhpte.dw0.dw0.h = secondary;
299 lhpte.dw0.dw0.bolted = bolted;
304 lhpte.dw0.dw0.avpn &= ~0x1UL;
307 /* Now fill in the actual HPTE */
308 /* Set CEC cookie to 0 */
310 /* I-cache Invalidate = 0 */
311 /* I-cache synchronize = 0 */
315 /* XXX why is this here? - Anton */
316 if (hpteflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
317 lhpte.dw1.flags.flags &= ~_PAGE_COHERENT;
319 lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, lhpte.dw0.dword0,
320 lhpte.dw1.dword1, &slot, &dummy0, &dummy1);
322 if (unlikely(lpar_rc == H_PTEG_Full))
326 * Since we try and ioremap PHBs we don't own, the pte insert
327 * will fail. However we must catch the failure in hash_page
328 * or we will loop forever, so return -2 in this case.
330 if (unlikely(lpar_rc != H_Success))
333 /* Because of iSeries, we have to pass down the secondary
334 * bucket bit here as well
336 return (slot & 7) | (secondary << 3);
339 static spinlock_t pSeries_lpar_tlbie_lock = SPIN_LOCK_UNLOCKED;
341 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
343 unsigned long slot_offset;
344 unsigned long lpar_rc;
346 unsigned long dummy1, dummy2;
348 /* pick a random slot to start at */
349 slot_offset = mftb() & 0x7;
351 for (i = 0; i < HPTES_PER_GROUP; i++) {
353 /* don't remove a bolted entry */
354 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
355 (0x1UL << 4), &dummy1, &dummy2);
357 if (lpar_rc == H_Success)
360 BUG_ON(lpar_rc != H_Not_Found);
369 static void pSeries_lpar_hptab_clear(void)
371 unsigned long size_bytes = 1UL << naca->pftSize;
372 unsigned long hpte_count = size_bytes >> 4;
373 unsigned long dummy1, dummy2;
376 /* TODO: Use bulk call */
377 for (i = 0; i < hpte_count; i++)
378 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
382 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
383 * the low 3 bits of flags happen to line up. So no transform is needed.
384 * We can probably optimize here and assume the high bits of newpp are
385 * already zero. For now I am paranoid.
387 static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
388 unsigned long va, int large, int local)
390 unsigned long lpar_rc;
391 unsigned long flags = (newpp & 7) | H_AVPN;
392 unsigned long avpn = va >> 23;
397 lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
399 if (lpar_rc == H_Not_Found)
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 vpn)
432 unsigned long dword0;
437 hash = hpt_hash(vpn, 0);
439 for (j = 0; j < 2; j++) {
440 slot = (hash & htab_data.htab_hash_mask) * HPTES_PER_GROUP;
441 for (i = 0; i < HPTES_PER_GROUP; i++) {
442 hpte_dw0.dword0 = pSeries_lpar_hpte_getword0(slot);
445 if ((dw0.avpn == (vpn >> 11)) && dw0.v &&
460 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
463 unsigned long lpar_rc;
464 unsigned long vsid, va, vpn, flags;
467 vsid = get_kernel_vsid(ea);
468 va = (vsid << 28) | (ea & 0x0fffffff);
469 vpn = va >> PAGE_SHIFT;
471 slot = pSeries_lpar_hpte_find(vpn);
475 lpar_rc = plpar_pte_protect(flags, slot, 0);
477 BUG_ON(lpar_rc != H_Success);
480 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
481 int large, int local)
483 unsigned long avpn = va >> 23;
484 unsigned long lpar_rc;
485 unsigned long dummy1, dummy2;
490 lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
493 if (lpar_rc == H_Not_Found)
496 BUG_ON(lpar_rc != H_Success);
500 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
503 void pSeries_lpar_flush_hash_range(unsigned long context, unsigned long number,
508 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
509 int lock_tlbie = !(cur_cpu_spec->cpu_features & CPU_FTR_LOCKLESS_TLBIE);
512 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
514 for (i = 0; i < number; i++)
515 flush_hash_page(context, batch->addr[i], batch->pte[i], local);
518 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
521 void hpte_init_lpar(void)
523 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
524 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
525 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
526 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
527 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
528 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
529 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;