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
22 /* Enables debugging of low-level hash table routines - careful! */
25 #include <linux/kernel.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/console.h>
28 #include <linux/export.h>
29 #include <linux/jump_label.h>
30 #include <linux/delay.h>
31 #include <linux/stop_machine.h>
32 #include <asm/processor.h>
35 #include <asm/pgtable.h>
36 #include <asm/machdep.h>
37 #include <asm/mmu_context.h>
38 #include <asm/iommu.h>
39 #include <asm/tlbflush.h>
42 #include <asm/cputable.h>
45 #include <asm/trace.h>
46 #include <asm/firmware.h>
47 #include <asm/plpar_wrappers.h>
48 #include <asm/kexec.h>
49 #include <asm/fadump.h>
50 #include <asm/asm-prototypes.h>
51 #include <asm/debugfs.h>
55 /* Flag bits for H_BULK_REMOVE */
56 #define HBR_REQUEST 0x4000000000000000UL
57 #define HBR_RESPONSE 0x8000000000000000UL
58 #define HBR_END 0xc000000000000000UL
59 #define HBR_AVPN 0x0200000000000000UL
60 #define HBR_ANDCOND 0x0100000000000000UL
64 EXPORT_SYMBOL(plpar_hcall);
65 EXPORT_SYMBOL(plpar_hcall9);
66 EXPORT_SYMBOL(plpar_hcall_norets);
68 void vpa_init(int cpu)
70 int hwcpu = get_hard_smp_processor_id(cpu);
73 struct paca_struct *pp;
74 struct dtl_entry *dtl;
77 * The spec says it "may be problematic" if CPU x registers the VPA of
78 * CPU y. We should never do that, but wail if we ever do.
80 WARN_ON(cpu != smp_processor_id());
82 if (cpu_has_feature(CPU_FTR_ALTIVEC))
83 lppaca_of(cpu).vmxregs_in_use = 1;
85 if (cpu_has_feature(CPU_FTR_ARCH_207S))
86 lppaca_of(cpu).ebb_regs_in_use = 1;
88 addr = __pa(&lppaca_of(cpu));
89 ret = register_vpa(hwcpu, addr);
92 pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
93 "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
97 #ifdef CONFIG_PPC_STD_MMU_64
99 * PAPR says this feature is SLB-Buffer but firmware never
100 * reports that. All SPLPAR support SLB shadow buffer.
102 if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) {
103 addr = __pa(paca[cpu].slb_shadow_ptr);
104 ret = register_slb_shadow(hwcpu, addr);
106 pr_err("WARNING: SLB shadow buffer registration for "
107 "cpu %d (hw %d) of area %lx failed with %ld\n",
108 cpu, hwcpu, addr, ret);
110 #endif /* CONFIG_PPC_STD_MMU_64 */
113 * Register dispatch trace log, if one has been allocated.
116 dtl = pp->dispatch_log;
120 lppaca_of(cpu).dtl_idx = 0;
122 /* hypervisor reads buffer length from this field */
123 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
124 ret = register_dtl(hwcpu, __pa(dtl));
126 pr_err("WARNING: DTL registration of cpu %d (hw %d) "
127 "failed with %ld\n", smp_processor_id(),
129 lppaca_of(cpu).dtl_enable_mask = 2;
133 #ifdef CONFIG_PPC_STD_MMU_64
135 static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
136 unsigned long vpn, unsigned long pa,
137 unsigned long rflags, unsigned long vflags,
138 int psize, int apsize, int ssize)
140 unsigned long lpar_rc;
143 unsigned long hpte_v, hpte_r;
145 if (!(vflags & HPTE_V_BOLTED))
146 pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
147 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
148 hpte_group, vpn, pa, rflags, vflags, psize);
150 hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
151 hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;
153 if (!(vflags & HPTE_V_BOLTED))
154 pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
156 /* Now fill in the actual HPTE */
157 /* Set CEC cookie to 0 */
159 /* I-cache Invalidate = 0 */
160 /* I-cache synchronize = 0 */
164 if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
165 flags |= H_COALESCE_CAND;
167 lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
168 if (unlikely(lpar_rc == H_PTEG_FULL)) {
169 if (!(vflags & HPTE_V_BOLTED))
175 * Since we try and ioremap PHBs we don't own, the pte insert
176 * will fail. However we must catch the failure in hash_page
177 * or we will loop forever, so return -2 in this case.
179 if (unlikely(lpar_rc != H_SUCCESS)) {
180 if (!(vflags & HPTE_V_BOLTED))
181 pr_devel(" lpar err %ld\n", lpar_rc);
184 if (!(vflags & HPTE_V_BOLTED))
185 pr_devel(" -> slot: %lu\n", slot & 7);
187 /* Because of iSeries, we have to pass down the secondary
188 * bucket bit here as well
190 return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
193 static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
195 static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
197 unsigned long slot_offset;
198 unsigned long lpar_rc;
200 unsigned long dummy1, dummy2;
202 /* pick a random slot to start at */
203 slot_offset = mftb() & 0x7;
205 for (i = 0; i < HPTES_PER_GROUP; i++) {
207 /* don't remove a bolted entry */
208 lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
209 (0x1UL << 4), &dummy1, &dummy2);
210 if (lpar_rc == H_SUCCESS)
214 * The test for adjunct partition is performed before the
215 * ANDCOND test. H_RESOURCE may be returned, so we need to
216 * check for that as well.
218 BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
227 static void manual_hpte_clear_all(void)
229 unsigned long size_bytes = 1UL << ppc64_pft_size;
230 unsigned long hpte_count = size_bytes >> 4;
238 /* Read in batches of 4,
239 * invalidate only valid entries not in the VRMA
240 * hpte_count will be a multiple of 4
242 for (i = 0; i < hpte_count; i += 4) {
243 lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
244 if (lpar_rc != H_SUCCESS)
246 for (j = 0; j < 4; j++){
247 if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
250 if (ptes[j].pteh & HPTE_V_VALID)
251 plpar_pte_remove_raw(0, i + j, 0,
252 &(ptes[j].pteh), &(ptes[j].ptel));
257 static int hcall_hpte_clear_all(void)
262 rc = plpar_hcall_norets(H_CLEAR_HPT);
263 } while (rc == H_CONTINUE);
268 static void pseries_hpte_clear_all(void)
272 rc = hcall_hpte_clear_all();
274 manual_hpte_clear_all();
276 #ifdef __LITTLE_ENDIAN__
278 * Reset exceptions to big endian.
280 * FIXME this is a hack for kexec, we need to reset the exception
281 * endian before starting the new kernel and this is a convenient place
284 * This is also called on boot when a fadump happens. In that case we
285 * must not change the exception endian mode.
287 if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active())
288 pseries_big_endian_exceptions();
293 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
294 * the low 3 bits of flags happen to line up. So no transform is needed.
295 * We can probably optimize here and assume the high bits of newpp are
296 * already zero. For now I am paranoid.
298 static long pSeries_lpar_hpte_updatepp(unsigned long slot,
301 int psize, int apsize,
302 int ssize, unsigned long inv_flags)
304 unsigned long lpar_rc;
306 unsigned long want_v;
308 want_v = hpte_encode_avpn(vpn, psize, ssize);
310 pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
311 want_v, slot, flags, psize);
313 flags = (newpp & 7) | H_AVPN;
314 if (mmu_has_feature(MMU_FTR_KERNEL_RO))
315 /* Move pp0 into bit 8 (IBM 55) */
316 flags |= (newpp & HPTE_R_PP0) >> 55;
318 lpar_rc = plpar_pte_protect(flags, slot, want_v);
320 if (lpar_rc == H_NOT_FOUND) {
321 pr_devel("not found !\n");
327 BUG_ON(lpar_rc != H_SUCCESS);
332 static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group)
341 for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
343 lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
344 if (lpar_rc != H_SUCCESS)
347 for (j = 0; j < 4; j++) {
348 if (HPTE_V_COMPARE(ptes[j].pteh, want_v) &&
349 (ptes[j].pteh & HPTE_V_VALID))
357 static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
361 unsigned long want_v;
362 unsigned long hpte_group;
364 hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
365 want_v = hpte_encode_avpn(vpn, psize, ssize);
367 /* Bolted entries are always in the primary group */
368 hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
369 slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
372 return hpte_group + slot;
375 static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
377 int psize, int ssize)
380 unsigned long lpar_rc, slot, vsid, flags;
382 vsid = get_kernel_vsid(ea, ssize);
383 vpn = hpt_vpn(ea, vsid, ssize);
385 slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
389 if (mmu_has_feature(MMU_FTR_KERNEL_RO))
390 /* Move pp0 into bit 8 (IBM 55) */
391 flags |= (newpp & HPTE_R_PP0) >> 55;
393 lpar_rc = plpar_pte_protect(flags, slot, 0);
395 BUG_ON(lpar_rc != H_SUCCESS);
398 static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
399 int psize, int apsize,
400 int ssize, int local)
402 unsigned long want_v;
403 unsigned long lpar_rc;
404 unsigned long dummy1, dummy2;
406 pr_devel(" inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
407 slot, vpn, psize, local);
409 want_v = hpte_encode_avpn(vpn, psize, ssize);
410 lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
411 if (lpar_rc == H_NOT_FOUND)
414 BUG_ON(lpar_rc != H_SUCCESS);
417 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
419 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
420 * to make sure that we avoid bouncing the hypervisor tlbie lock.
422 #define PPC64_HUGE_HPTE_BATCH 12
424 static void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
425 unsigned long *vpn, int count,
426 int psize, int ssize)
428 unsigned long param[PLPAR_HCALL9_BUFSIZE];
429 int i = 0, pix = 0, rc;
430 unsigned long flags = 0;
431 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
434 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
436 for (i = 0; i < count; i++) {
438 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
439 pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
442 param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
443 param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
446 rc = plpar_hcall9(H_BULK_REMOVE, param,
447 param[0], param[1], param[2],
448 param[3], param[4], param[5],
450 BUG_ON(rc != H_SUCCESS);
456 param[pix] = HBR_END;
457 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
458 param[2], param[3], param[4], param[5],
460 BUG_ON(rc != H_SUCCESS);
464 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
467 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
469 unsigned char *hpte_slot_array,
470 int psize, int ssize, int local)
473 unsigned long s_addr = addr;
474 unsigned int max_hpte_count, valid;
475 unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
476 unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
477 unsigned long shift, hidx, vpn = 0, hash, slot;
479 shift = mmu_psize_defs[psize].shift;
480 max_hpte_count = 1U << (PMD_SHIFT - shift);
482 for (i = 0; i < max_hpte_count; i++) {
483 valid = hpte_valid(hpte_slot_array, i);
486 hidx = hpte_hash_index(hpte_slot_array, i);
489 addr = s_addr + (i * (1ul << shift));
490 vpn = hpt_vpn(addr, vsid, ssize);
491 hash = hpt_hash(vpn, shift, ssize);
492 if (hidx & _PTEIDX_SECONDARY)
495 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
496 slot += hidx & _PTEIDX_GROUP_IX;
498 slot_array[index] = slot;
499 vpn_array[index] = vpn;
500 if (index == PPC64_HUGE_HPTE_BATCH - 1) {
502 * Now do a bluk invalidate
504 __pSeries_lpar_hugepage_invalidate(slot_array,
506 PPC64_HUGE_HPTE_BATCH,
513 __pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
514 index, psize, ssize);
517 static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
519 unsigned char *hpte_slot_array,
520 int psize, int ssize, int local)
522 WARN(1, "%s called without THP support\n", __func__);
526 static int pSeries_lpar_hpte_removebolted(unsigned long ea,
527 int psize, int ssize)
530 unsigned long slot, vsid;
532 vsid = get_kernel_vsid(ea, ssize);
533 vpn = hpt_vpn(ea, vsid, ssize);
535 slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
540 * lpar doesn't use the passed actual page size
542 pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
547 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
550 static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
553 unsigned long i, pix, rc;
554 unsigned long flags = 0;
555 struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
556 int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
557 unsigned long param[PLPAR_HCALL9_BUFSIZE];
558 unsigned long hash, index, shift, hidx, slot;
563 spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
565 psize = batch->psize;
566 ssize = batch->ssize;
568 for (i = 0; i < number; i++) {
571 pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
572 hash = hpt_hash(vpn, shift, ssize);
573 hidx = __rpte_to_hidx(pte, index);
574 if (hidx & _PTEIDX_SECONDARY)
576 slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
577 slot += hidx & _PTEIDX_GROUP_IX;
578 if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
580 * lpar doesn't use the passed actual page size
582 pSeries_lpar_hpte_invalidate(slot, vpn, psize,
585 param[pix] = HBR_REQUEST | HBR_AVPN | slot;
586 param[pix+1] = hpte_encode_avpn(vpn, psize,
590 rc = plpar_hcall9(H_BULK_REMOVE, param,
591 param[0], param[1], param[2],
592 param[3], param[4], param[5],
594 BUG_ON(rc != H_SUCCESS);
598 } pte_iterate_hashed_end();
601 param[pix] = HBR_END;
602 rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
603 param[2], param[3], param[4], param[5],
605 BUG_ON(rc != H_SUCCESS);
609 spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
612 static int __init disable_bulk_remove(char *str)
614 if (strcmp(str, "off") == 0 &&
615 firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
616 printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
617 powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
622 __setup("bulk_remove=", disable_bulk_remove);
624 #define HPT_RESIZE_TIMEOUT 10000 /* ms */
626 struct hpt_resize_state {
631 static int pseries_lpar_resize_hpt_commit(void *data)
633 struct hpt_resize_state *state = data;
635 state->commit_rc = plpar_resize_hpt_commit(0, state->shift);
636 if (state->commit_rc != H_SUCCESS)
639 /* Hypervisor has transitioned the HTAB, update our globals */
640 ppc64_pft_size = state->shift;
641 htab_size_bytes = 1UL << ppc64_pft_size;
642 htab_hash_mask = (htab_size_bytes >> 7) - 1;
648 * Must be called in process context. The caller must hold the
651 static int pseries_lpar_resize_hpt(unsigned long shift)
653 struct hpt_resize_state state = {
655 .commit_rc = H_FUNCTION,
657 unsigned int delay, total_delay = 0;
663 if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE))
666 printk(KERN_INFO "lpar: Attempting to resize HPT to shift %lu\n",
671 rc = plpar_resize_hpt_prepare(0, shift);
672 while (H_IS_LONG_BUSY(rc)) {
673 delay = get_longbusy_msecs(rc);
674 total_delay += delay;
675 if (total_delay > HPT_RESIZE_TIMEOUT) {
676 /* prepare with shift==0 cancels an in-progress resize */
677 rc = plpar_resize_hpt_prepare(0, 0);
680 "lpar: Unexpected error %d cancelling timed out HPT resize\n",
685 rc = plpar_resize_hpt_prepare(0, shift);
699 "lpar: Unexpected error %d from H_RESIZE_HPT_PREPARE\n",
706 rc = stop_machine_cpuslocked(pseries_lpar_resize_hpt_commit,
712 switch (state.commit_rc) {
715 "lpar: Hash collision while resizing HPT\n");
720 "lpar: Unexpected error %d from H_RESIZE_HPT_COMMIT\n",
727 "lpar: HPT resize to shift %lu complete (%lld ms / %lld ms)\n",
728 shift, (long long) ktime_ms_delta(t1, t0),
729 (long long) ktime_ms_delta(t2, t1));
734 static int pseries_lpar_register_process_table(unsigned long base,
735 unsigned long page_size, unsigned long table_size)
738 unsigned long flags = 0;
741 flags |= PROC_TABLE_NEW;
743 flags |= PROC_TABLE_RADIX | PROC_TABLE_GTSE;
745 flags |= PROC_TABLE_HPT_SLB;
747 rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base,
748 page_size, table_size);
749 if (!H_IS_LONG_BUSY(rc))
751 mdelay(get_longbusy_msecs(rc));
753 if (rc != H_SUCCESS) {
754 pr_err("Failed to register process table (rc=%ld)\n", rc);
760 void __init hpte_init_pseries(void)
762 mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate;
763 mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp;
764 mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
765 mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert;
766 mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove;
767 mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted;
768 mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range;
769 mmu_hash_ops.hpte_clear_all = pseries_hpte_clear_all;
770 mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
771 register_process_table = pseries_lpar_register_process_table;
773 if (firmware_has_feature(FW_FEATURE_HPT_RESIZE))
774 mmu_hash_ops.resize_hpt = pseries_lpar_resize_hpt;
777 void radix_init_pseries(void)
779 pr_info("Using radix MMU under hypervisor\n");
780 register_process_table = pseries_lpar_register_process_table;
783 #ifdef CONFIG_PPC_SMLPAR
784 #define CMO_FREE_HINT_DEFAULT 1
785 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
787 static int __init cmo_free_hint(char *str)
790 parm = strstrip(str);
792 if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
793 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
794 cmo_free_hint_flag = 0;
798 cmo_free_hint_flag = 1;
799 printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
801 if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
807 __setup("cmo_free_hint=", cmo_free_hint);
809 static void pSeries_set_page_state(struct page *page, int order,
813 unsigned long cmo_page_sz, addr;
815 cmo_page_sz = cmo_get_page_size();
816 addr = __pa((unsigned long)page_address(page));
818 for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
819 for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
820 plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
824 void arch_free_page(struct page *page, int order)
828 if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
831 pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
833 EXPORT_SYMBOL(arch_free_page);
835 #endif /* CONFIG_PPC_SMLPAR */
836 #endif /* CONFIG_PPC_STD_MMU_64 */
838 #ifdef CONFIG_TRACEPOINTS
839 #ifdef HAVE_JUMP_LABEL
840 struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;
842 int hcall_tracepoint_regfunc(void)
844 static_key_slow_inc(&hcall_tracepoint_key);
848 void hcall_tracepoint_unregfunc(void)
850 static_key_slow_dec(&hcall_tracepoint_key);
854 * We optimise our hcall path by placing hcall_tracepoint_refcount
855 * directly in the TOC so we can check if the hcall tracepoints are
856 * enabled via a single load.
859 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
860 extern long hcall_tracepoint_refcount;
862 int hcall_tracepoint_regfunc(void)
864 hcall_tracepoint_refcount++;
868 void hcall_tracepoint_unregfunc(void)
870 hcall_tracepoint_refcount--;
875 * Since the tracing code might execute hcalls we need to guard against
876 * recursion. One example of this are spinlocks calling H_YIELD on
877 * shared processor partitions.
879 static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);
882 void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
888 * We cannot call tracepoints inside RCU idle regions which
889 * means we must not trace H_CEDE.
891 if (opcode == H_CEDE)
894 local_irq_save(flags);
896 depth = this_cpu_ptr(&hcall_trace_depth);
903 trace_hcall_entry(opcode, args);
907 local_irq_restore(flags);
910 void __trace_hcall_exit(long opcode, unsigned long retval,
911 unsigned long *retbuf)
916 if (opcode == H_CEDE)
919 local_irq_save(flags);
921 depth = this_cpu_ptr(&hcall_trace_depth);
927 trace_hcall_exit(opcode, retval, retbuf);
932 local_irq_restore(flags);
938 * H_GET_MPP hcall returns info in 7 parms
940 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
943 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
945 rc = plpar_hcall9(H_GET_MPP, retbuf);
947 mpp_data->entitled_mem = retbuf[0];
948 mpp_data->mapped_mem = retbuf[1];
950 mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
951 mpp_data->pool_num = retbuf[2] & 0xffff;
953 mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
954 mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
955 mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;
957 mpp_data->pool_size = retbuf[4];
958 mpp_data->loan_request = retbuf[5];
959 mpp_data->backing_mem = retbuf[6];
963 EXPORT_SYMBOL(h_get_mpp);
965 int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
968 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
970 rc = plpar_hcall9(H_GET_MPP_X, retbuf);
972 mpp_x_data->coalesced_bytes = retbuf[0];
973 mpp_x_data->pool_coalesced_bytes = retbuf[1];
974 mpp_x_data->pool_purr_cycles = retbuf[2];
975 mpp_x_data->pool_spurr_cycles = retbuf[3];
980 static unsigned long vsid_unscramble(unsigned long vsid, int ssize)
982 unsigned long protovsid;
983 unsigned long va_bits = VA_BITS;
984 unsigned long modinv, vsid_modulus;
985 unsigned long max_mod_inv, tmp_modinv;
987 if (!mmu_has_feature(MMU_FTR_68_BIT_VA))
990 if (ssize == MMU_SEGSIZE_256M) {
991 modinv = VSID_MULINV_256M;
992 vsid_modulus = ((1UL << (va_bits - SID_SHIFT)) - 1);
994 modinv = VSID_MULINV_1T;
995 vsid_modulus = ((1UL << (va_bits - SID_SHIFT_1T)) - 1);
999 * vsid outside our range.
1001 if (vsid >= vsid_modulus)
1005 * If modinv is the modular multiplicate inverse of (x % vsid_modulus)
1006 * and vsid = (protovsid * x) % vsid_modulus, then we say:
1007 * protovsid = (vsid * modinv) % vsid_modulus
1010 /* Check if (vsid * modinv) overflow (63 bits) */
1011 max_mod_inv = 0x7fffffffffffffffull / vsid;
1012 if (modinv < max_mod_inv)
1013 return (vsid * modinv) % vsid_modulus;
1015 tmp_modinv = modinv/max_mod_inv;
1016 modinv %= max_mod_inv;
1018 protovsid = (((vsid * max_mod_inv) % vsid_modulus) * tmp_modinv) % vsid_modulus;
1019 protovsid = (protovsid + vsid * modinv) % vsid_modulus;
1024 static int __init reserve_vrma_context_id(void)
1026 unsigned long protovsid;
1029 * Reserve context ids which map to reserved virtual addresses. For now
1030 * we only reserve the context id which maps to the VRMA VSID. We ignore
1031 * the addresses in "ibm,adjunct-virtual-addresses" because we don't
1032 * enable adjunct support via the "ibm,client-architecture-support"
1035 protovsid = vsid_unscramble(VRMA_VSID, MMU_SEGSIZE_1T);
1036 hash__reserve_context_id(protovsid >> ESID_BITS_1T);
1039 machine_device_initcall(pseries, reserve_vrma_context_id);
1041 #ifdef CONFIG_DEBUG_FS
1042 /* debugfs file interface for vpa data */
1043 static ssize_t vpa_file_read(struct file *filp, char __user *buf, size_t len,
1046 int cpu = (long)filp->private_data;
1047 struct lppaca *lppaca = &lppaca_of(cpu);
1049 return simple_read_from_buffer(buf, len, pos, lppaca,
1050 sizeof(struct lppaca));
1053 static const struct file_operations vpa_fops = {
1054 .open = simple_open,
1055 .read = vpa_file_read,
1056 .llseek = default_llseek,
1059 static int __init vpa_debugfs_init(void)
1063 struct dentry *vpa_dir;
1065 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
1068 vpa_dir = debugfs_create_dir("vpa", powerpc_debugfs_root);
1070 pr_warn("%s: can't create vpa root dir\n", __func__);
1074 /* set up the per-cpu vpa file*/
1075 for_each_possible_cpu(i) {
1078 sprintf(name, "cpu-%ld", i);
1080 d = debugfs_create_file(name, 0400, vpa_dir, (void *)i,
1083 pr_warn("%s: can't create per-cpu vpa file\n",
1091 machine_arch_initcall(pseries, vpa_debugfs_init);
1092 #endif /* CONFIG_DEBUG_FS */