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>
41 #include <asm/plpar_wrappers.h>
44 #define DBG(fmt...) udbg_printf(fmt)
49 /* in pSeries_hvCall.S */
50 EXPORT_SYMBOL(plpar_hcall);
51 EXPORT_SYMBOL(plpar_hcall_4out);
52 EXPORT_SYMBOL(plpar_hcall_norets);
53 EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
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(unsigned 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 unsigned char 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(unsigned 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 unsigned char 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 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 int find_udbg_vterm(void)
203 struct device_node *stdout_node;
208 /* find the boot console from /chosen/stdout */
211 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
214 stdout_node = of_find_node_by_path(name);
218 /* now we have the stdout node; figure out what type of device it is. */
219 name = (char *)get_property(stdout_node, "name", NULL);
221 printk(KERN_WARNING "stdout node missing 'name' property!\n");
225 if (strncmp(name, "vty", 3) == 0) {
226 if (device_is_compatible(stdout_node, "hvterm1")) {
227 termno = (u32 *)get_property(stdout_node, "reg", NULL);
230 udbg_putc = udbg_putcLP;
231 udbg_getc = udbg_getcLP;
232 udbg_getc_poll = udbg_getc_pollLP;
235 } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
236 termno = (u32 *)get_property(stdout_node, "reg", NULL);
239 udbg_putc = udbg_hvsi_putc;
240 udbg_getc = udbg_hvsi_getc;
241 udbg_getc_poll = udbg_hvsi_getc_poll;
245 } else if (strncmp(name, "serial", 6)) {
246 /* XXX fix ISA serial console */
247 printk(KERN_WARNING "serial stdout on LPAR ('%s')! "
248 "can't print udbg messages\n",
249 stdout_node->full_name);
251 printk(KERN_WARNING "don't know how to print to stdout '%s'\n",
252 stdout_node->full_name);
256 of_node_put(stdout_node);
260 void vpa_init(int cpu)
262 int hwcpu = get_hard_smp_processor_id(cpu);
263 unsigned long vpa = (unsigned long)&(paca[cpu].lppaca);
267 /* Register the Virtual Processor Area (VPA) */
268 flags = 1UL << (63 - 18);
270 if (cpu_has_feature(CPU_FTR_ALTIVEC))
271 paca[cpu].lppaca.vmxregs_in_use = 1;
273 ret = register_vpa(flags, hwcpu, __pa(vpa));
276 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
277 "cpu %d (hw %d) of area %lx returns %ld\n",
278 cpu, hwcpu, __pa(vpa), ret);
281 long pSeries_lpar_hpte_insert(unsigned long hpte_group,
282 unsigned long va, unsigned long prpn,
283 unsigned long vflags, unsigned long rflags)
285 unsigned long lpar_rc;
288 unsigned long hpte_v, hpte_r;
289 unsigned long dummy0, dummy1;
291 hpte_v = ((va >> 23) << HPTE_V_AVPN_SHIFT) | vflags | HPTE_V_VALID;
292 if (vflags & HPTE_V_LARGE)
293 hpte_v &= ~(1UL << HPTE_V_AVPN_SHIFT);
295 hpte_r = (prpn << HPTE_R_RPN_SHIFT) | rflags;
297 /* Now fill in the actual HPTE */
298 /* Set CEC cookie to 0 */
300 /* I-cache Invalidate = 0 */
301 /* I-cache synchronize = 0 */
305 /* XXX why is this here? - Anton */
306 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
307 hpte_r &= ~_PAGE_COHERENT;
309 lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v,
310 hpte_r, &slot, &dummy0, &dummy1);
312 if (unlikely(lpar_rc == H_PTEG_Full))
316 * Since we try and ioremap PHBs we don't own, the pte insert
317 * will fail. However we must catch the failure in hash_page
318 * or we will loop forever, so return -2 in this case.
320 if (unlikely(lpar_rc != H_Success))
323 /* Because of iSeries, we have to pass down the secondary
324 * bucket bit here as well
326 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
329 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
331 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
333 unsigned long slot_offset;
334 unsigned long lpar_rc;
336 unsigned long dummy1, dummy2;
338 /* pick a random slot to start at */
339 slot_offset = mftb() & 0x7;
341 for (i = 0; i < HPTES_PER_GROUP; i++) {
343 /* don't remove a bolted entry */
344 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
345 (0x1UL << 4), &dummy1, &dummy2);
347 if (lpar_rc == H_Success)
350 BUG_ON(lpar_rc != H_Not_Found);
359 static void pSeries_lpar_hptab_clear(void)
361 unsigned long size_bytes = 1UL << ppc64_pft_size;
362 unsigned long hpte_count = size_bytes >> 4;
363 unsigned long dummy1, dummy2;
366 /* TODO: Use bulk call */
367 for (i = 0; i < hpte_count; i++)
368 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
372 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
373 * the low 3 bits of flags happen to line up. So no transform is needed.
374 * We can probably optimize here and assume the high bits of newpp are
375 * already zero. For now I am paranoid.
377 static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
378 unsigned long va, int large, int local)
380 unsigned long lpar_rc;
381 unsigned long flags = (newpp & 7) | H_AVPN;
382 unsigned long avpn = va >> 23;
387 lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
389 if (lpar_rc == H_Not_Found)
392 BUG_ON(lpar_rc != H_Success);
397 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
399 unsigned long dword0;
400 unsigned long lpar_rc;
401 unsigned long dummy_word1;
404 /* Read 1 pte at a time */
405 /* Do not need RPN to logical page translation */
406 /* No cross CEC PFT access */
409 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
411 BUG_ON(lpar_rc != H_Success);
416 static long pSeries_lpar_hpte_find(unsigned long vpn)
421 unsigned long hpte_v;
423 hash = hpt_hash(vpn, 0);
425 for (j = 0; j < 2; j++) {
426 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
427 for (i = 0; i < HPTES_PER_GROUP; i++) {
428 hpte_v = pSeries_lpar_hpte_getword0(slot);
430 if ((HPTE_V_AVPN_VAL(hpte_v) == (vpn >> 11))
431 && (hpte_v & HPTE_V_VALID)
432 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
446 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
449 unsigned long lpar_rc;
450 unsigned long vsid, va, vpn, flags;
453 vsid = get_kernel_vsid(ea);
454 va = (vsid << 28) | (ea & 0x0fffffff);
455 vpn = va >> PAGE_SHIFT;
457 slot = pSeries_lpar_hpte_find(vpn);
461 lpar_rc = plpar_pte_protect(flags, slot, 0);
463 BUG_ON(lpar_rc != H_Success);
466 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
467 int large, int local)
469 unsigned long avpn = va >> 23;
470 unsigned long lpar_rc;
471 unsigned long dummy1, dummy2;
476 lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
479 if (lpar_rc == H_Not_Found)
482 BUG_ON(lpar_rc != H_Success);
486 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
489 void pSeries_lpar_flush_hash_range(unsigned long context, unsigned long number,
493 unsigned long flags = 0;
494 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
495 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
498 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
500 for (i = 0; i < number; i++)
501 flush_hash_page(context, batch->addr[i], batch->pte[i], local);
504 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
507 void hpte_init_lpar(void)
509 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
510 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
511 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
512 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
513 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
514 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
515 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;