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>
36 #include <asm/tlbflush.h>
39 #include <asm/abs_addr.h>
40 #include <asm/cputable.h>
42 #include "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 pSeries_find_serial_port(void);
59 int vtermno; /* virtual terminal# for udbg */
61 #define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
62 static void udbg_hvsi_putc(unsigned char c)
64 /* packet's seqno isn't used anyways */
65 uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
72 rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
73 } while (rc == H_Busy);
76 static long hvsi_udbg_buf_len;
77 static uint8_t hvsi_udbg_buf[256];
79 static int udbg_hvsi_getc_poll(void)
84 if (hvsi_udbg_buf_len == 0) {
85 rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
86 if (rc != H_Success || hvsi_udbg_buf[0] != 0xff) {
87 /* bad read or non-data packet */
88 hvsi_udbg_buf_len = 0;
90 /* remove the packet header */
91 for (i = 4; i < hvsi_udbg_buf_len; i++)
92 hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
93 hvsi_udbg_buf_len -= 4;
97 if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
99 hvsi_udbg_buf_len = 0;
103 ch = hvsi_udbg_buf[0];
104 /* shift remaining data down */
105 for (i = 1; i < hvsi_udbg_buf_len; i++) {
106 hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
113 static unsigned char udbg_hvsi_getc(void)
117 ch = udbg_hvsi_getc_poll();
119 /* This shouldn't be needed...but... */
120 volatile unsigned long delay;
121 for (delay=0; delay < 2000000; delay++)
129 static void udbg_putcLP(unsigned char c)
139 rc = plpar_put_term_char(vtermno, 1, buf);
140 } while(rc == H_Busy);
143 /* Buffered chars getc */
144 static long inbuflen;
145 static long inbuf[2]; /* must be 2 longs */
147 static int udbg_getc_pollLP(void)
149 /* The interface is tricky because it may return up to 16 chars.
150 * We save them statically for future calls to udbg_getc().
152 char ch, *buf = (char *)inbuf;
156 /* get some more chars. */
158 rc = plpar_get_term_char(vtermno, &inbuflen, buf);
160 inbuflen = 0; /* otherwise inbuflen is garbage */
162 if (inbuflen <= 0 || inbuflen > 16) {
163 /* Catch error case as well as other oddities (corruption) */
168 for (i = 1; i < inbuflen; i++) /* shuffle them down. */
174 static unsigned char udbg_getcLP(void)
178 ch = udbg_getc_pollLP();
180 /* This shouldn't be needed...but... */
181 volatile unsigned long delay;
182 for (delay=0; delay < 2000000; delay++)
190 /* call this from early_init() for a working debug console on
191 * vterm capable LPAR machines
193 void udbg_init_debug_lpar(void)
196 udbg_putc = udbg_putcLP;
197 udbg_getc = udbg_getcLP;
198 udbg_getc_poll = udbg_getc_pollLP;
201 /* returns 0 if couldn't find or use /chosen/stdout as console */
202 int find_udbg_vterm(void)
204 struct device_node *stdout_node;
209 /* find the boot console from /chosen/stdout */
212 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
215 stdout_node = of_find_node_by_path(name);
219 /* now we have the stdout node; figure out what type of device it is. */
220 name = (char *)get_property(stdout_node, "name", NULL);
222 printk(KERN_WARNING "stdout node missing 'name' property!\n");
226 if (strncmp(name, "vty", 3) == 0) {
227 if (device_is_compatible(stdout_node, "hvterm1")) {
228 termno = (u32 *)get_property(stdout_node, "reg", NULL);
231 udbg_putc = udbg_putcLP;
232 udbg_getc = udbg_getcLP;
233 udbg_getc_poll = udbg_getc_pollLP;
236 } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
237 termno = (u32 *)get_property(stdout_node, "reg", NULL);
240 udbg_putc = udbg_hvsi_putc;
241 udbg_getc = udbg_hvsi_getc;
242 udbg_getc_poll = udbg_hvsi_getc_poll;
246 } else if (strncmp(name, "serial", 6)) {
247 /* XXX fix ISA serial console */
248 printk(KERN_WARNING "serial stdout on LPAR ('%s')! "
249 "can't print udbg messages\n",
250 stdout_node->full_name);
252 printk(KERN_WARNING "don't know how to print to stdout '%s'\n",
253 stdout_node->full_name);
257 of_node_put(stdout_node);
261 void vpa_init(int cpu)
263 int hwcpu = get_hard_smp_processor_id(cpu);
264 unsigned long vpa = __pa(&paca[cpu].lppaca);
267 if (cpu_has_feature(CPU_FTR_ALTIVEC))
268 paca[cpu].lppaca.vmxregs_in_use = 1;
270 ret = register_vpa(hwcpu, vpa);
273 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
274 "cpu %d (hw %d) of area %lx returns %ld\n",
275 cpu, hwcpu, vpa, ret);
278 long pSeries_lpar_hpte_insert(unsigned long hpte_group,
279 unsigned long va, unsigned long prpn,
280 unsigned long vflags, unsigned long rflags)
282 unsigned long lpar_rc;
285 unsigned long hpte_v, hpte_r;
286 unsigned long dummy0, dummy1;
288 hpte_v = ((va >> 23) << HPTE_V_AVPN_SHIFT) | vflags | HPTE_V_VALID;
289 if (vflags & HPTE_V_LARGE)
290 hpte_v &= ~(1UL << HPTE_V_AVPN_SHIFT);
292 hpte_r = (prpn << HPTE_R_RPN_SHIFT) | rflags;
294 /* Now fill in the actual HPTE */
295 /* Set CEC cookie to 0 */
297 /* I-cache Invalidate = 0 */
298 /* I-cache synchronize = 0 */
302 /* XXX why is this here? - Anton */
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);
309 if (unlikely(lpar_rc == H_PTEG_Full))
313 * Since we try and ioremap PHBs we don't own, the pte insert
314 * will fail. However we must catch the failure in hash_page
315 * or we will loop forever, so return -2 in this case.
317 if (unlikely(lpar_rc != H_Success))
320 /* Because of iSeries, we have to pass down the secondary
321 * bucket bit here as well
323 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
326 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
328 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
330 unsigned long slot_offset;
331 unsigned long lpar_rc;
333 unsigned long dummy1, dummy2;
335 /* pick a random slot to start at */
336 slot_offset = mftb() & 0x7;
338 for (i = 0; i < HPTES_PER_GROUP; i++) {
340 /* don't remove a bolted entry */
341 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
342 (0x1UL << 4), &dummy1, &dummy2);
344 if (lpar_rc == H_Success)
347 BUG_ON(lpar_rc != H_Not_Found);
356 static void pSeries_lpar_hptab_clear(void)
358 unsigned long size_bytes = 1UL << ppc64_pft_size;
359 unsigned long hpte_count = size_bytes >> 4;
360 unsigned long dummy1, dummy2;
363 /* TODO: Use bulk call */
364 for (i = 0; i < hpte_count; i++)
365 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
369 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
370 * the low 3 bits of flags happen to line up. So no transform is needed.
371 * We can probably optimize here and assume the high bits of newpp are
372 * already zero. For now I am paranoid.
374 static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
375 unsigned long va, int large, int local)
377 unsigned long lpar_rc;
378 unsigned long flags = (newpp & 7) | H_AVPN;
379 unsigned long avpn = va >> 23;
384 lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
386 if (lpar_rc == H_Not_Found)
389 BUG_ON(lpar_rc != H_Success);
394 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
396 unsigned long dword0;
397 unsigned long lpar_rc;
398 unsigned long dummy_word1;
401 /* Read 1 pte at a time */
402 /* Do not need RPN to logical page translation */
403 /* No cross CEC PFT access */
406 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
408 BUG_ON(lpar_rc != H_Success);
413 static long pSeries_lpar_hpte_find(unsigned long vpn)
418 unsigned long hpte_v;
420 hash = hpt_hash(vpn, 0);
422 for (j = 0; j < 2; j++) {
423 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
424 for (i = 0; i < HPTES_PER_GROUP; i++) {
425 hpte_v = pSeries_lpar_hpte_getword0(slot);
427 if ((HPTE_V_AVPN_VAL(hpte_v) == (vpn >> 11))
428 && (hpte_v & HPTE_V_VALID)
429 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
443 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
446 unsigned long lpar_rc;
447 unsigned long vsid, va, vpn, flags;
450 vsid = get_kernel_vsid(ea);
451 va = (vsid << 28) | (ea & 0x0fffffff);
452 vpn = va >> PAGE_SHIFT;
454 slot = pSeries_lpar_hpte_find(vpn);
458 lpar_rc = plpar_pte_protect(flags, slot, 0);
460 BUG_ON(lpar_rc != H_Success);
463 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
464 int large, int local)
466 unsigned long avpn = va >> 23;
467 unsigned long lpar_rc;
468 unsigned long dummy1, dummy2;
473 lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
476 if (lpar_rc == H_Not_Found)
479 BUG_ON(lpar_rc != H_Success);
483 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
486 void pSeries_lpar_flush_hash_range(unsigned long number, int local)
489 unsigned long flags = 0;
490 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
491 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
494 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
496 for (i = 0; i < number; i++)
497 flush_hash_page(batch->vaddr[i], batch->pte[i], local);
500 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
503 void hpte_init_lpar(void)
505 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
506 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
507 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
508 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
509 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
510 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
511 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;