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 static void udbg_putcLP(unsigned char c)
72 rc = plpar_put_term_char(vtermno, 1, buf);
73 } while(rc == H_Busy);
76 /* Buffered chars getc */
78 static long inbuf[2]; /* must be 2 longs */
80 static int udbg_getc_pollLP(void)
82 /* The interface is tricky because it may return up to 16 chars.
83 * We save them statically for future calls to udbg_getc().
85 char ch, *buf = (char *)inbuf;
89 /* get some more chars. */
91 rc = plpar_get_term_char(vtermno, &inbuflen, buf);
93 inbuflen = 0; /* otherwise inbuflen is garbage */
95 if (inbuflen <= 0 || inbuflen > 16) {
96 /* Catch error case as well as other oddities (corruption) */
101 for (i = 1; i < inbuflen; i++) /* shuffle them down. */
107 static unsigned char udbg_getcLP(void)
111 ch = udbg_getc_pollLP();
113 /* This shouldn't be needed...but... */
114 volatile unsigned long delay;
115 for (delay=0; delay < 2000000; delay++)
123 /* call this from early_init() for a working debug console on
124 * vterm capable LPAR machines
126 void udbg_init_debug_lpar(void)
129 ppc_md.udbg_putc = udbg_putcLP;
130 ppc_md.udbg_getc = udbg_getcLP;
131 ppc_md.udbg_getc_poll = udbg_getc_pollLP;
134 /* returns 0 if couldn't find or use /chosen/stdout as console */
135 int find_udbg_vterm(void)
137 struct device_node *stdout_node;
142 /* find the boot console from /chosen/stdout */
145 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
148 stdout_node = of_find_node_by_path(name);
152 /* now we have the stdout node; figure out what type of device it is. */
153 name = (char *)get_property(stdout_node, "name", NULL);
155 printk(KERN_WARNING "stdout node missing 'name' property!\n");
159 if (strncmp(name, "vty", 3) == 0) {
160 if (device_is_compatible(stdout_node, "hvterm1")) {
161 termno = (u32 *)get_property(stdout_node, "reg", NULL);
164 ppc_md.udbg_putc = udbg_putcLP;
165 ppc_md.udbg_getc = udbg_getcLP;
166 ppc_md.udbg_getc_poll = udbg_getc_pollLP;
170 /* XXX implement udbg_putcLP_vtty for hvterm-protocol1 case */
171 printk(KERN_WARNING "%s doesn't speak hvterm1; "
172 "can't print udbg messages\n",
173 stdout_node->full_name);
175 } else if (strncmp(name, "serial", 6)) {
176 /* XXX fix ISA serial console */
177 printk(KERN_WARNING "serial stdout on LPAR ('%s')! "
178 "can't print udbg messages\n",
179 stdout_node->full_name);
181 printk(KERN_WARNING "don't know how to print to stdout '%s'\n",
182 stdout_node->full_name);
186 of_node_put(stdout_node);
191 long pSeries_lpar_hpte_insert(unsigned long hpte_group,
192 unsigned long va, unsigned long prpn,
193 int secondary, unsigned long hpteflags,
194 int bolted, int large)
196 unsigned long arpn = physRpn_to_absRpn(prpn);
197 unsigned long lpar_rc;
201 unsigned long dummy0, dummy1;
203 /* Fill in the local HPTE with absolute rpn, avpn and flags */
204 lhpte.dw1.dword1 = 0;
205 lhpte.dw1.dw1.rpn = arpn;
206 lhpte.dw1.flags.flags = hpteflags;
208 lhpte.dw0.dword0 = 0;
209 lhpte.dw0.dw0.avpn = va >> 23;
210 lhpte.dw0.dw0.h = secondary;
211 lhpte.dw0.dw0.bolted = bolted;
216 lhpte.dw0.dw0.avpn &= ~0x1UL;
219 /* Now fill in the actual HPTE */
220 /* Set CEC cookie to 0 */
222 /* I-cache Invalidate = 0 */
223 /* I-cache synchronize = 0 */
227 /* XXX why is this here? - Anton */
228 if (hpteflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
229 lhpte.dw1.flags.flags &= ~_PAGE_COHERENT;
231 lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, lhpte.dw0.dword0,
232 lhpte.dw1.dword1, &slot, &dummy0, &dummy1);
234 if (unlikely(lpar_rc == H_PTEG_Full))
238 * Since we try and ioremap PHBs we don't own, the pte insert
239 * will fail. However we must catch the failure in hash_page
240 * or we will loop forever, so return -2 in this case.
242 if (unlikely(lpar_rc != H_Success))
245 /* Because of iSeries, we have to pass down the secondary
246 * bucket bit here as well
248 return (slot & 7) | (secondary << 3);
251 static spinlock_t pSeries_lpar_tlbie_lock = SPIN_LOCK_UNLOCKED;
253 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
255 unsigned long slot_offset;
256 unsigned long lpar_rc;
258 unsigned long dummy1, dummy2;
260 /* pick a random slot to start at */
261 slot_offset = mftb() & 0x7;
263 for (i = 0; i < HPTES_PER_GROUP; i++) {
265 /* don't remove a bolted entry */
266 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
267 (0x1UL << 4), &dummy1, &dummy2);
269 if (lpar_rc == H_Success)
272 BUG_ON(lpar_rc != H_Not_Found);
281 static void pSeries_lpar_hptab_clear(void)
283 unsigned long size_bytes = 1UL << naca->pftSize;
284 unsigned long hpte_count = size_bytes >> 4;
285 unsigned long dummy1, dummy2;
288 /* TODO: Use bulk call */
289 for (i = 0; i < hpte_count; i++)
290 plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
294 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
295 * the low 3 bits of flags happen to line up. So no transform is needed.
296 * We can probably optimize here and assume the high bits of newpp are
297 * already zero. For now I am paranoid.
299 static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
300 unsigned long va, int large, int local)
302 unsigned long lpar_rc;
303 unsigned long flags = (newpp & 7) | H_AVPN;
304 unsigned long avpn = va >> 23;
309 lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
311 if (lpar_rc == H_Not_Found)
314 BUG_ON(lpar_rc != H_Success);
319 static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
321 unsigned long dword0;
322 unsigned long lpar_rc;
323 unsigned long dummy_word1;
326 /* Read 1 pte at a time */
327 /* Do not need RPN to logical page translation */
328 /* No cross CEC PFT access */
331 lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
333 BUG_ON(lpar_rc != H_Success);
338 static long pSeries_lpar_hpte_find(unsigned long vpn)
344 unsigned long dword0;
349 hash = hpt_hash(vpn, 0);
351 for (j = 0; j < 2; j++) {
352 slot = (hash & htab_data.htab_hash_mask) * HPTES_PER_GROUP;
353 for (i = 0; i < HPTES_PER_GROUP; i++) {
354 hpte_dw0.dword0 = pSeries_lpar_hpte_getword0(slot);
357 if ((dw0.avpn == (vpn >> 11)) && dw0.v &&
372 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
375 unsigned long lpar_rc;
376 unsigned long vsid, va, vpn, flags;
379 vsid = get_kernel_vsid(ea);
380 va = (vsid << 28) | (ea & 0x0fffffff);
381 vpn = va >> PAGE_SHIFT;
383 slot = pSeries_lpar_hpte_find(vpn);
387 lpar_rc = plpar_pte_protect(flags, slot, 0);
389 BUG_ON(lpar_rc != H_Success);
392 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
393 int large, int local)
395 unsigned long avpn = va >> 23;
396 unsigned long lpar_rc;
397 unsigned long dummy1, dummy2;
402 lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
405 if (lpar_rc == H_Not_Found)
408 BUG_ON(lpar_rc != H_Success);
412 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
415 void pSeries_lpar_flush_hash_range(unsigned long context, unsigned long number,
420 struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
421 int lock_tlbie = !(cur_cpu_spec->cpu_features & CPU_FTR_LOCKLESS_TLBIE);
424 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
426 for (i = 0; i < number; i++)
427 flush_hash_page(context, batch->addr[i], batch->pte[i], local);
430 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
433 void hpte_init_lpar(void)
435 ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
436 ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
437 ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
438 ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
439 ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
440 ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
441 ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;