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)
52 EXPORT_SYMBOL(plpar_hcall);
53 EXPORT_SYMBOL(plpar_hcall9);
54 EXPORT_SYMBOL(plpar_hcall_norets);
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(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 int 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(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 int 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 __init 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 void __init find_udbg_vterm(void)
204 struct device_node *stdout_node;
209 /* find the boot console from /chosen/stdout */
212 name = get_property(of_chosen, "linux,stdout-path", NULL);
215 stdout_node = of_find_node_by_path(name);
218 name = get_property(stdout_node, "name", NULL);
220 printk(KERN_WARNING "stdout node missing 'name' property!\n");
223 /* The user has requested a console so this is already set up. */
224 add_console = !strstr(cmd_line, "console=");
226 /* Check if it's a virtual terminal */
227 if (strncmp(name, "vty", 3) != 0)
229 termno = get_property(stdout_node, "reg", NULL);
234 if (device_is_compatible(stdout_node, "hvterm1")) {
235 udbg_putc = udbg_putcLP;
236 udbg_getc = udbg_getcLP;
237 udbg_getc_poll = udbg_getc_pollLP;
239 add_preferred_console("hvc", termno[0] & 0xff, NULL);
240 } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
242 udbg_putc = udbg_hvsi_putc;
243 udbg_getc = udbg_hvsi_getc;
244 udbg_getc_poll = udbg_hvsi_getc_poll;
246 add_preferred_console("hvsi", termno[0] & 0xff, NULL);
249 of_node_put(stdout_node);
252 void vpa_init(int cpu)
254 int hwcpu = get_hard_smp_processor_id(cpu);
258 if (cpu_has_feature(CPU_FTR_ALTIVEC))
259 lppaca[cpu].vmxregs_in_use = 1;
261 addr = __pa(&lppaca[cpu]);
262 ret = register_vpa(hwcpu, addr);
265 printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
266 "cpu %d (hw %d) of area %lx returns %ld\n",
267 cpu, hwcpu, addr, ret);
271 * PAPR says this feature is SLB-Buffer but firmware never
272 * reports that. All SPLPAR support SLB shadow buffer.
274 addr = __pa(&slb_shadow[cpu]);
275 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
276 ret = register_slb_shadow(hwcpu, addr);
279 "WARNING: vpa_init: SLB shadow buffer "
280 "registration for cpu %d (hw %d) of area %lx "
281 "returns %ld\n", cpu, hwcpu, addr, ret);
285 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
286 unsigned long va, unsigned long pa,
287 unsigned long rflags, unsigned long vflags,
290 unsigned long lpar_rc;
293 unsigned long hpte_v, hpte_r;
295 if (!(vflags & HPTE_V_BOLTED))
296 DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
297 "rflags=%lx, vflags=%lx, psize=%d)\n",
298 hpte_group, va, pa, rflags, vflags, psize);
300 hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
301 hpte_r = hpte_encode_r(pa, psize) | rflags;
303 if (!(vflags & HPTE_V_BOLTED))
304 DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
306 /* Now fill in the actual HPTE */
307 /* Set CEC cookie to 0 */
309 /* I-cache Invalidate = 0 */
310 /* I-cache synchronize = 0 */
314 /* Make pHyp happy */
315 if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
316 hpte_r &= ~_PAGE_COHERENT;
318 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
319 if (unlikely(lpar_rc == H_PTEG_FULL)) {
320 if (!(vflags & HPTE_V_BOLTED))
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)) {
331 if (!(vflags & HPTE_V_BOLTED))
332 DBG_LOW(" lpar err %d\n", lpar_rc);
335 if (!(vflags & HPTE_V_BOLTED))
336 DBG_LOW(" -> slot: %d\n", slot & 7);
338 /* Because of iSeries, we have to pass down the secondary
339 * bucket bit here as well
341 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
344 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
346 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
348 unsigned long slot_offset;
349 unsigned long lpar_rc;
351 unsigned long dummy1, dummy2;
353 /* pick a random slot to start at */
354 slot_offset = mftb() & 0x7;
356 for (i = 0; i < HPTES_PER_GROUP; i++) {
358 /* don't remove a bolted entry */
359 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
360 (0x1UL << 4), &dummy1, &dummy2);
361 if (lpar_rc == H_SUCCESS)
363 BUG_ON(lpar_rc != H_NOT_FOUND);
372 static void pSeries_lpar_hptab_clear(void)
374 unsigned long size_bytes = 1UL << ppc64_pft_size;
375 unsigned long hpte_count = size_bytes >> 4;
376 unsigned long dummy1, dummy2;
379 /* TODO: Use bulk call */
380 for (i = 0; i < hpte_count; i++)
381 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
385 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
386 * the low 3 bits of flags happen to line up. So no transform is needed.
387 * We can probably optimize here and assume the high bits of newpp are
388 * already zero. For now I am paranoid.
390 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
393 int psize, int local)
395 unsigned long lpar_rc;
396 unsigned long flags = (newpp & 7) | H_AVPN;
397 unsigned long want_v;
399 want_v = hpte_encode_v(va, psize);
401 DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
402 want_v & HPTE_V_AVPN, slot, flags, psize);
404 lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN);
406 if (lpar_rc == H_NOT_FOUND) {
407 DBG_LOW("not found !\n");
413 BUG_ON(lpar_rc != H_SUCCESS);
418 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
420 unsigned long dword0;
421 unsigned long lpar_rc;
422 unsigned long dummy_word1;
425 /* Read 1 pte at a time */
426 /* Do not need RPN to logical page translation */
427 /* No cross CEC PFT access */
430 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
432 BUG_ON(lpar_rc != H_SUCCESS);
437 static long pSeries_lpar_hpte_find(unsigned long va, int psize)
442 unsigned long want_v, hpte_v;
444 hash = hpt_hash(va, mmu_psize_defs[psize].shift);
445 want_v = hpte_encode_v(va, psize);
447 for (j = 0; j < 2; j++) {
448 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
449 for (i = 0; i < HPTES_PER_GROUP; i++) {
450 hpte_v = pSeries_lpar_hpte_getword0(slot);
452 if (HPTE_V_COMPARE(hpte_v, want_v)
453 && (hpte_v & HPTE_V_VALID)
454 && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
468 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
472 unsigned long lpar_rc, slot, vsid, va, flags;
474 vsid = get_kernel_vsid(ea);
475 va = (vsid << 28) | (ea & 0x0fffffff);
477 slot = pSeries_lpar_hpte_find(va, psize);
481 lpar_rc = plpar_pte_protect(flags, slot, 0);
483 BUG_ON(lpar_rc != H_SUCCESS);
486 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
487 int psize, int local)
489 unsigned long want_v;
490 unsigned long lpar_rc;
491 unsigned long dummy1, dummy2;
493 DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d",
494 slot, va, psize, local);
496 want_v = hpte_encode_v(va, psize);
497 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN,
499 if (lpar_rc == H_NOT_FOUND)
502 BUG_ON(lpar_rc != H_SUCCESS);
506 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
509 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
512 unsigned long flags = 0;
513 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
514 int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
517 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
519 for (i = 0; i < number; i++)
520 flush_hash_page(batch->vaddr[i], batch->pte[i],
521 batch->psize, local);
524 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
527 void __init hpte_init_lpar(void)
529 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
530 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
531 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
532 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
533 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
534 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
535 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;