Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * native hashtable management. |
| 3 | * |
| 4 | * SMP scalability work: |
| 5 | * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 12 | |
| 13 | #undef DEBUG_LOW |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/spinlock.h> |
| 16 | #include <linux/bitops.h> |
Michael Ellerman | beacc6d | 2012-07-25 21:20:03 +0000 | [diff] [blame] | 17 | #include <linux/of.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/threads.h> |
| 19 | #include <linux/smp.h> |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <asm/machdep.h> |
| 22 | #include <asm/mmu.h> |
| 23 | #include <asm/mmu_context.h> |
| 24 | #include <asm/pgtable.h> |
| 25 | #include <asm/tlbflush.h> |
| 26 | #include <asm/tlb.h> |
| 27 | #include <asm/cputable.h> |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 28 | #include <asm/udbg.h> |
Luke Browning | 71bf08b | 2007-05-03 00:19:11 +1000 | [diff] [blame] | 29 | #include <asm/kexec.h> |
Milton Miller | 60dbf43 | 2009-04-29 20:58:01 +0000 | [diff] [blame] | 30 | #include <asm/ppc-opcode.h> |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 31 | |
Michael Neuling | ec249dd | 2015-05-27 16:07:16 +1000 | [diff] [blame] | 32 | #include <misc/cxl-base.h> |
Ian Munsie | 4c6d9ac | 2014-10-08 19:55:00 +1100 | [diff] [blame] | 33 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 34 | #ifdef DEBUG_LOW |
| 35 | #define DBG_LOW(fmt...) udbg_printf(fmt) |
| 36 | #else |
| 37 | #define DBG_LOW(fmt...) |
| 38 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 40 | #ifdef __BIG_ENDIAN__ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #define HPTE_LOCK_BIT 3 |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 42 | #else |
| 43 | #define HPTE_LOCK_BIT (56+3) |
| 44 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Paul Mackerras | 9e368f2 | 2011-06-29 00:40:08 +0000 | [diff] [blame] | 46 | DEFINE_RAW_SPINLOCK(native_tlbie_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 48 | static inline void __tlbie(unsigned long vpn, int psize, int apsize, int ssize) |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 49 | { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 50 | unsigned long va; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 51 | unsigned int penc; |
Aneesh Kumar K.V | de64095 | 2013-07-04 10:34:45 +0530 | [diff] [blame] | 52 | unsigned long sllp; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 53 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 54 | /* |
| 55 | * We need 14 to 65 bits of va for a tlibe of 4K page |
| 56 | * With vpn we ignore the lower VPN_SHIFT bits already. |
| 57 | * And top two bits are already ignored because we can |
| 58 | * only accomadate 76 bits in a 64 bit vpn with a VPN_SHIFT |
| 59 | * of 12. |
| 60 | */ |
| 61 | va = vpn << VPN_SHIFT; |
| 62 | /* |
| 63 | * clear top 16 bits of 64bit va, non SLS segment |
| 64 | * Older versions of the architecture (2.02 and earler) require the |
| 65 | * masking of the top 16 bits. |
| 66 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 67 | va &= ~(0xffffULL << 48); |
| 68 | |
| 69 | switch (psize) { |
| 70 | case MMU_PAGE_4K: |
Aneesh Kumar K.V | 1f6aaac | 2013-04-28 09:37:39 +0000 | [diff] [blame] | 71 | /* clear out bits after (52) [0....52.....63] */ |
| 72 | va &= ~((1ul << (64 - 52)) - 1); |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 73 | va |= ssize << 8; |
Aneesh Kumar K.V | de64095 | 2013-07-04 10:34:45 +0530 | [diff] [blame] | 74 | sllp = ((mmu_psize_defs[apsize].sllp & SLB_VSID_L) >> 6) | |
| 75 | ((mmu_psize_defs[apsize].sllp & SLB_VSID_LP) >> 4); |
| 76 | va |= sllp << 5; |
Michael Neuling | a32e252 | 2011-04-06 18:23:29 +0000 | [diff] [blame] | 77 | asm volatile(ASM_FTR_IFCLR("tlbie %0,0", PPC_TLBIE(%1,%0), %2) |
Paul Mackerras | 969391c | 2011-06-29 00:26:11 +0000 | [diff] [blame] | 78 | : : "r" (va), "r"(0), "i" (CPU_FTR_ARCH_206) |
Milton Miller | 60dbf43 | 2009-04-29 20:58:01 +0000 | [diff] [blame] | 79 | : "memory"); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 80 | break; |
| 81 | default: |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 82 | /* We need 14 to 14 + i bits of va */ |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 83 | penc = mmu_psize_defs[psize].penc[apsize]; |
Aneesh Kumar K.V | 1f6aaac | 2013-04-28 09:37:39 +0000 | [diff] [blame] | 84 | va &= ~((1ul << mmu_psize_defs[apsize].shift) - 1); |
Arnd Bergmann | 19242b2 | 2006-06-15 21:15:44 +1000 | [diff] [blame] | 85 | va |= penc << 12; |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 86 | va |= ssize << 8; |
Aneesh Kumar K.V | 29ef7a3 | 2014-04-21 10:37:36 +0530 | [diff] [blame] | 87 | /* |
| 88 | * AVAL bits: |
| 89 | * We don't need all the bits, but rest of the bits |
| 90 | * must be ignored by the processor. |
| 91 | * vpn cover upto 65 bits of va. (0...65) and we need |
| 92 | * 58..64 bits of va. |
| 93 | */ |
| 94 | va |= (vpn & 0xfe); /* AVAL */ |
Milton Miller | 60dbf43 | 2009-04-29 20:58:01 +0000 | [diff] [blame] | 95 | va |= 1; /* L */ |
Michael Neuling | a32e252 | 2011-04-06 18:23:29 +0000 | [diff] [blame] | 96 | asm volatile(ASM_FTR_IFCLR("tlbie %0,1", PPC_TLBIE(%1,%0), %2) |
Paul Mackerras | 969391c | 2011-06-29 00:26:11 +0000 | [diff] [blame] | 97 | : : "r" (va), "r"(0), "i" (CPU_FTR_ARCH_206) |
Milton Miller | 60dbf43 | 2009-04-29 20:58:01 +0000 | [diff] [blame] | 98 | : "memory"); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 99 | break; |
| 100 | } |
| 101 | } |
| 102 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 103 | static inline void __tlbiel(unsigned long vpn, int psize, int apsize, int ssize) |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 104 | { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 105 | unsigned long va; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 106 | unsigned int penc; |
Aneesh Kumar K.V | de64095 | 2013-07-04 10:34:45 +0530 | [diff] [blame] | 107 | unsigned long sllp; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 108 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 109 | /* VPN_SHIFT can be atmost 12 */ |
| 110 | va = vpn << VPN_SHIFT; |
| 111 | /* |
| 112 | * clear top 16 bits of 64 bit va, non SLS segment |
| 113 | * Older versions of the architecture (2.02 and earler) require the |
| 114 | * masking of the top 16 bits. |
| 115 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 116 | va &= ~(0xffffULL << 48); |
| 117 | |
| 118 | switch (psize) { |
| 119 | case MMU_PAGE_4K: |
Aneesh Kumar K.V | 1f6aaac | 2013-04-28 09:37:39 +0000 | [diff] [blame] | 120 | /* clear out bits after(52) [0....52.....63] */ |
| 121 | va &= ~((1ul << (64 - 52)) - 1); |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 122 | va |= ssize << 8; |
Aneesh Kumar K.V | de64095 | 2013-07-04 10:34:45 +0530 | [diff] [blame] | 123 | sllp = ((mmu_psize_defs[apsize].sllp & SLB_VSID_L) >> 6) | |
| 124 | ((mmu_psize_defs[apsize].sllp & SLB_VSID_LP) >> 4); |
| 125 | va |= sllp << 5; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 126 | asm volatile(".long 0x7c000224 | (%0 << 11) | (0 << 21)" |
| 127 | : : "r"(va) : "memory"); |
| 128 | break; |
| 129 | default: |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 130 | /* We need 14 to 14 + i bits of va */ |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 131 | penc = mmu_psize_defs[psize].penc[apsize]; |
Aneesh Kumar K.V | 1f6aaac | 2013-04-28 09:37:39 +0000 | [diff] [blame] | 132 | va &= ~((1ul << mmu_psize_defs[apsize].shift) - 1); |
Arnd Bergmann | 19242b2 | 2006-06-15 21:15:44 +1000 | [diff] [blame] | 133 | va |= penc << 12; |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 134 | va |= ssize << 8; |
Aneesh Kumar K.V | 29ef7a3 | 2014-04-21 10:37:36 +0530 | [diff] [blame] | 135 | /* |
| 136 | * AVAL bits: |
| 137 | * We don't need all the bits, but rest of the bits |
| 138 | * must be ignored by the processor. |
| 139 | * vpn cover upto 65 bits of va. (0...65) and we need |
| 140 | * 58..64 bits of va. |
| 141 | */ |
| 142 | va |= (vpn & 0xfe); |
Milton Miller | 60dbf43 | 2009-04-29 20:58:01 +0000 | [diff] [blame] | 143 | va |= 1; /* L */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 144 | asm volatile(".long 0x7c000224 | (%0 << 11) | (1 << 21)" |
| 145 | : : "r"(va) : "memory"); |
| 146 | break; |
| 147 | } |
| 148 | |
| 149 | } |
| 150 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 151 | static inline void tlbie(unsigned long vpn, int psize, int apsize, |
| 152 | int ssize, int local) |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 153 | { |
Ian Munsie | 4c6d9ac | 2014-10-08 19:55:00 +1100 | [diff] [blame] | 154 | unsigned int use_local; |
Matt Evans | 44ae3ab | 2011-04-06 19:48:50 +0000 | [diff] [blame] | 155 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 156 | |
Ian Munsie | 4c6d9ac | 2014-10-08 19:55:00 +1100 | [diff] [blame] | 157 | use_local = local && mmu_has_feature(MMU_FTR_TLBIEL) && !cxl_ctx_in_use(); |
| 158 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 159 | if (use_local) |
| 160 | use_local = mmu_psize_defs[psize].tlbiel; |
| 161 | if (lock_tlbie && !use_local) |
Thomas Gleixner | 6b9c9b8 | 2010-02-18 02:22:35 +0000 | [diff] [blame] | 162 | raw_spin_lock(&native_tlbie_lock); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 163 | asm volatile("ptesync": : :"memory"); |
| 164 | if (use_local) { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 165 | __tlbiel(vpn, psize, apsize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 166 | asm volatile("ptesync": : :"memory"); |
| 167 | } else { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 168 | __tlbie(vpn, psize, apsize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 169 | asm volatile("eieio; tlbsync; ptesync": : :"memory"); |
| 170 | } |
| 171 | if (lock_tlbie && !use_local) |
Thomas Gleixner | 6b9c9b8 | 2010-02-18 02:22:35 +0000 | [diff] [blame] | 172 | raw_spin_unlock(&native_tlbie_lock); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 173 | } |
| 174 | |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 175 | static inline void native_lock_hpte(struct hash_pte *hptep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | { |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 177 | unsigned long *word = (unsigned long *)&hptep->v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
| 179 | while (1) { |
Anton Blanchard | 66d99b8 | 2010-02-10 01:03:06 +0000 | [diff] [blame] | 180 | if (!test_and_set_bit_lock(HPTE_LOCK_BIT, word)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | break; |
| 182 | while(test_bit(HPTE_LOCK_BIT, word)) |
| 183 | cpu_relax(); |
| 184 | } |
| 185 | } |
| 186 | |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 187 | static inline void native_unlock_hpte(struct hash_pte *hptep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | { |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 189 | unsigned long *word = (unsigned long *)&hptep->v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Anton Blanchard | 66d99b8 | 2010-02-10 01:03:06 +0000 | [diff] [blame] | 191 | clear_bit_unlock(HPTE_LOCK_BIT, word); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 194 | static long native_hpte_insert(unsigned long hpte_group, unsigned long vpn, |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 195 | unsigned long pa, unsigned long rflags, |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 196 | unsigned long vflags, int psize, int apsize, int ssize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | { |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 198 | struct hash_pte *hptep = htab_address + hpte_group; |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 199 | unsigned long hpte_v, hpte_r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | int i; |
| 201 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 202 | if (!(vflags & HPTE_V_BOLTED)) { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 203 | DBG_LOW(" insert(group=%lx, vpn=%016lx, pa=%016lx," |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 204 | " rflags=%lx, vflags=%lx, psize=%d)\n", |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 205 | hpte_group, vpn, pa, rflags, vflags, psize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 206 | } |
| 207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | for (i = 0; i < HPTES_PER_GROUP; i++) { |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 209 | if (! (be64_to_cpu(hptep->v) & HPTE_V_VALID)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | /* retry with lock held */ |
| 211 | native_lock_hpte(hptep); |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 212 | if (! (be64_to_cpu(hptep->v) & HPTE_V_VALID)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | break; |
| 214 | native_unlock_hpte(hptep); |
| 215 | } |
| 216 | |
| 217 | hptep++; |
| 218 | } |
| 219 | |
| 220 | if (i == HPTES_PER_GROUP) |
| 221 | return -1; |
| 222 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 223 | hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID; |
| 224 | hpte_r = hpte_encode_r(pa, psize, apsize) | rflags; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 225 | |
| 226 | if (!(vflags & HPTE_V_BOLTED)) { |
| 227 | DBG_LOW(" i=%x hpte_v=%016lx, hpte_r=%016lx\n", |
| 228 | i, hpte_v, hpte_r); |
| 229 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 231 | hptep->r = cpu_to_be64(hpte_r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | /* Guarantee the second dword is visible before the valid bit */ |
Kumar Gala | 74a0ba6 | 2007-07-09 23:49:09 -0500 | [diff] [blame] | 233 | eieio(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | /* |
| 235 | * Now set the first dword including the valid bit |
| 236 | * NOTE: this also unlocks the hpte |
| 237 | */ |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 238 | hptep->v = cpu_to_be64(hpte_v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
| 240 | __asm__ __volatile__ ("ptesync" : : : "memory"); |
| 241 | |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 242 | return i | (!!(vflags & HPTE_V_SECONDARY) << 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | static long native_hpte_remove(unsigned long hpte_group) |
| 246 | { |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 247 | struct hash_pte *hptep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | int i; |
| 249 | int slot_offset; |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 250 | unsigned long hpte_v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 252 | DBG_LOW(" remove(group=%lx)\n", hpte_group); |
| 253 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | /* pick a random entry to start at */ |
| 255 | slot_offset = mftb() & 0x7; |
| 256 | |
| 257 | for (i = 0; i < HPTES_PER_GROUP; i++) { |
| 258 | hptep = htab_address + hpte_group + slot_offset; |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 259 | hpte_v = be64_to_cpu(hptep->v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 261 | if ((hpte_v & HPTE_V_VALID) && !(hpte_v & HPTE_V_BOLTED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | /* retry with lock held */ |
| 263 | native_lock_hpte(hptep); |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 264 | hpte_v = be64_to_cpu(hptep->v); |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 265 | if ((hpte_v & HPTE_V_VALID) |
| 266 | && !(hpte_v & HPTE_V_BOLTED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | break; |
| 268 | native_unlock_hpte(hptep); |
| 269 | } |
| 270 | |
| 271 | slot_offset++; |
| 272 | slot_offset &= 0x7; |
| 273 | } |
| 274 | |
| 275 | if (i == HPTES_PER_GROUP) |
| 276 | return -1; |
| 277 | |
| 278 | /* Invalidate the hpte. NOTE: this also unlocks it */ |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 279 | hptep->v = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
| 281 | return i; |
| 282 | } |
| 283 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 284 | static long native_hpte_updatepp(unsigned long slot, unsigned long newpp, |
Aneesh Kumar K.V | db3d853 | 2013-06-20 14:30:13 +0530 | [diff] [blame] | 285 | unsigned long vpn, int bpsize, |
Aneesh Kumar K.V | aefa568 | 2014-12-04 11:00:14 +0530 | [diff] [blame] | 286 | int apsize, int ssize, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | { |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 288 | struct hash_pte *hptep = htab_address + slot; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 289 | unsigned long hpte_v, want_v; |
Aneesh Kumar K.V | aefa568 | 2014-12-04 11:00:14 +0530 | [diff] [blame] | 290 | int ret = 0, local = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Aneesh Kumar K.V | db3d853 | 2013-06-20 14:30:13 +0530 | [diff] [blame] | 292 | want_v = hpte_encode_avpn(vpn, bpsize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 293 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 294 | DBG_LOW(" update(vpn=%016lx, avpnv=%016lx, group=%lx, newpp=%lx)", |
| 295 | vpn, want_v & HPTE_V_AVPN, slot, newpp); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 296 | |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 297 | hpte_v = be64_to_cpu(hptep->v); |
Aneesh Kumar K.V | 0608d69 | 2013-05-31 01:03:24 +0000 | [diff] [blame] | 298 | /* |
| 299 | * We need to invalidate the TLB always because hpte_remove doesn't do |
| 300 | * a tlb invalidate. If a hash bucket gets full, we "evict" a more/less |
| 301 | * random entry from it. When we do that we don't invalidate the TLB |
| 302 | * (hpte_remove) because we assume the old translation is still |
| 303 | * technically "valid". |
| 304 | */ |
Aneesh Kumar K.V | db3d853 | 2013-06-20 14:30:13 +0530 | [diff] [blame] | 305 | if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 306 | DBG_LOW(" -> miss\n"); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 307 | ret = -1; |
| 308 | } else { |
Aneesh Kumar K.V | 0ec2698 | 2014-11-03 20:21:34 +0530 | [diff] [blame] | 309 | native_lock_hpte(hptep); |
| 310 | /* recheck with locks held */ |
| 311 | hpte_v = be64_to_cpu(hptep->v); |
| 312 | if (unlikely(!HPTE_V_COMPARE(hpte_v, want_v) || |
| 313 | !(hpte_v & HPTE_V_VALID))) { |
| 314 | ret = -1; |
| 315 | } else { |
| 316 | DBG_LOW(" -> hit\n"); |
| 317 | /* Update the HPTE */ |
| 318 | hptep->r = cpu_to_be64((be64_to_cpu(hptep->r) & |
| 319 | ~(HPTE_R_PP | HPTE_R_N)) | |
| 320 | (newpp & (HPTE_R_PP | HPTE_R_N | |
| 321 | HPTE_R_C))); |
| 322 | } |
| 323 | native_unlock_hpte(hptep); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 324 | } |
Aneesh Kumar K.V | aefa568 | 2014-12-04 11:00:14 +0530 | [diff] [blame] | 325 | |
| 326 | if (flags & HPTE_LOCAL_UPDATE) |
| 327 | local = 1; |
| 328 | /* |
| 329 | * Ensure it is out of the tlb too if it is not a nohpte fault |
| 330 | */ |
| 331 | if (!(flags & HPTE_NOHPTE_UPDATE)) |
| 332 | tlbie(vpn, bpsize, apsize, ssize, local); |
| 333 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 334 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | } |
| 336 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 337 | static long native_hpte_find(unsigned long vpn, int psize, int ssize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | { |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 339 | struct hash_pte *hptep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | unsigned long hash; |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 341 | unsigned long i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | long slot; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 343 | unsigned long want_v, hpte_v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 345 | hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); |
Aneesh Kumar K.V | 74f227b | 2013-04-28 09:37:34 +0000 | [diff] [blame] | 346 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 348 | /* Bolted mappings are only ever in the primary group */ |
| 349 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; |
| 350 | for (i = 0; i < HPTES_PER_GROUP; i++) { |
| 351 | hptep = htab_address + slot; |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 352 | hpte_v = be64_to_cpu(hptep->v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 354 | if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) |
| 355 | /* HPTE matches */ |
| 356 | return slot; |
| 357 | ++slot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | return -1; |
| 361 | } |
| 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | /* |
| 364 | * Update the page protection bits. Intended to be used to create |
| 365 | * guard pages for kernel data structures on pages which are bolted |
| 366 | * in the HPT. Assumes pages being operated on will not be stolen. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | * |
| 368 | * No need to lock here because we should be the only user. |
| 369 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 370 | static void native_hpte_updateboltedpp(unsigned long newpp, unsigned long ea, |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 371 | int psize, int ssize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 373 | unsigned long vpn; |
| 374 | unsigned long vsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | long slot; |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 376 | struct hash_pte *hptep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 378 | vsid = get_kernel_vsid(ea, ssize); |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 379 | vpn = hpt_vpn(ea, vsid, ssize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 381 | slot = native_hpte_find(vpn, psize, ssize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | if (slot == -1) |
| 383 | panic("could not find page to bolt\n"); |
| 384 | hptep = htab_address + slot; |
| 385 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 386 | /* Update the HPTE */ |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 387 | hptep->r = cpu_to_be64((be64_to_cpu(hptep->r) & |
| 388 | ~(HPTE_R_PP | HPTE_R_N)) | |
| 389 | (newpp & (HPTE_R_PP | HPTE_R_N))); |
Aneesh Kumar K.V | db3d853 | 2013-06-20 14:30:13 +0530 | [diff] [blame] | 390 | /* |
| 391 | * Ensure it is out of the tlb too. Bolted entries base and |
| 392 | * actual page size will be same. |
| 393 | */ |
| 394 | tlbie(vpn, psize, psize, ssize, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
| 396 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 397 | static void native_hpte_invalidate(unsigned long slot, unsigned long vpn, |
Aneesh Kumar K.V | db3d853 | 2013-06-20 14:30:13 +0530 | [diff] [blame] | 398 | int bpsize, int apsize, int ssize, int local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 400 | struct hash_pte *hptep = htab_address + slot; |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 401 | unsigned long hpte_v; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 402 | unsigned long want_v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
| 405 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 407 | DBG_LOW(" invalidate(vpn=%016lx, hash: %lx)\n", vpn, slot); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 408 | |
Aneesh Kumar K.V | db3d853 | 2013-06-20 14:30:13 +0530 | [diff] [blame] | 409 | want_v = hpte_encode_avpn(vpn, bpsize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 410 | native_lock_hpte(hptep); |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 411 | hpte_v = be64_to_cpu(hptep->v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Aneesh Kumar K.V | 0608d69 | 2013-05-31 01:03:24 +0000 | [diff] [blame] | 413 | /* |
| 414 | * We need to invalidate the TLB always because hpte_remove doesn't do |
| 415 | * a tlb invalidate. If a hash bucket gets full, we "evict" a more/less |
| 416 | * random entry from it. When we do that we don't invalidate the TLB |
| 417 | * (hpte_remove) because we assume the old translation is still |
| 418 | * technically "valid". |
| 419 | */ |
Aneesh Kumar K.V | db3d853 | 2013-06-20 14:30:13 +0530 | [diff] [blame] | 420 | if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | native_unlock_hpte(hptep); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 422 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | /* Invalidate the hpte. NOTE: this also unlocks it */ |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 424 | hptep->v = 0; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 425 | |
| 426 | /* Invalidate the TLB */ |
Aneesh Kumar K.V | db3d853 | 2013-06-20 14:30:13 +0530 | [diff] [blame] | 427 | tlbie(vpn, bpsize, apsize, ssize, local); |
| 428 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 429 | local_irq_restore(flags); |
| 430 | } |
| 431 | |
Aneesh Kumar K.V | e34aa03 | 2015-12-01 09:06:53 +0530 | [diff] [blame] | 432 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
Aneesh Kumar K.V | fa1f8ae | 2014-08-13 12:31:58 +0530 | [diff] [blame] | 433 | static void native_hugepage_invalidate(unsigned long vsid, |
| 434 | unsigned long addr, |
Aneesh Kumar K.V | 1a52728 | 2013-06-20 14:30:27 +0530 | [diff] [blame] | 435 | unsigned char *hpte_slot_array, |
Aneesh Kumar K.V | d557b09 | 2014-11-02 21:15:28 +0530 | [diff] [blame] | 436 | int psize, int ssize, int local) |
Aneesh Kumar K.V | 1a52728 | 2013-06-20 14:30:27 +0530 | [diff] [blame] | 437 | { |
Aneesh Kumar K.V | 969b7b2 | 2014-08-13 12:32:01 +0530 | [diff] [blame] | 438 | int i; |
Aneesh Kumar K.V | 1a52728 | 2013-06-20 14:30:27 +0530 | [diff] [blame] | 439 | struct hash_pte *hptep; |
| 440 | int actual_psize = MMU_PAGE_16M; |
| 441 | unsigned int max_hpte_count, valid; |
| 442 | unsigned long flags, s_addr = addr; |
| 443 | unsigned long hpte_v, want_v, shift; |
Aneesh Kumar K.V | fa1f8ae | 2014-08-13 12:31:58 +0530 | [diff] [blame] | 444 | unsigned long hidx, vpn = 0, hash, slot; |
Aneesh Kumar K.V | 1a52728 | 2013-06-20 14:30:27 +0530 | [diff] [blame] | 445 | |
| 446 | shift = mmu_psize_defs[psize].shift; |
| 447 | max_hpte_count = 1U << (PMD_SHIFT - shift); |
| 448 | |
| 449 | local_irq_save(flags); |
| 450 | for (i = 0; i < max_hpte_count; i++) { |
| 451 | valid = hpte_valid(hpte_slot_array, i); |
| 452 | if (!valid) |
| 453 | continue; |
| 454 | hidx = hpte_hash_index(hpte_slot_array, i); |
| 455 | |
| 456 | /* get the vpn */ |
| 457 | addr = s_addr + (i * (1ul << shift)); |
Aneesh Kumar K.V | 1a52728 | 2013-06-20 14:30:27 +0530 | [diff] [blame] | 458 | vpn = hpt_vpn(addr, vsid, ssize); |
| 459 | hash = hpt_hash(vpn, shift, ssize); |
| 460 | if (hidx & _PTEIDX_SECONDARY) |
| 461 | hash = ~hash; |
| 462 | |
| 463 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; |
| 464 | slot += hidx & _PTEIDX_GROUP_IX; |
| 465 | |
| 466 | hptep = htab_address + slot; |
| 467 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
| 468 | native_lock_hpte(hptep); |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 469 | hpte_v = be64_to_cpu(hptep->v); |
Aneesh Kumar K.V | 1a52728 | 2013-06-20 14:30:27 +0530 | [diff] [blame] | 470 | |
| 471 | /* Even if we miss, we need to invalidate the TLB */ |
| 472 | if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) |
| 473 | native_unlock_hpte(hptep); |
| 474 | else |
| 475 | /* Invalidate the hpte. NOTE: this also unlocks it */ |
| 476 | hptep->v = 0; |
Aneesh Kumar K.V | 969b7b2 | 2014-08-13 12:32:01 +0530 | [diff] [blame] | 477 | /* |
| 478 | * We need to do tlb invalidate for all the address, tlbie |
| 479 | * instruction compares entry_VA in tlb with the VA specified |
| 480 | * here |
| 481 | */ |
Aneesh Kumar K.V | d557b09 | 2014-11-02 21:15:28 +0530 | [diff] [blame] | 482 | tlbie(vpn, psize, actual_psize, ssize, local); |
Aneesh Kumar K.V | 1a52728 | 2013-06-20 14:30:27 +0530 | [diff] [blame] | 483 | } |
Aneesh Kumar K.V | 1a52728 | 2013-06-20 14:30:27 +0530 | [diff] [blame] | 484 | local_irq_restore(flags); |
| 485 | } |
Aneesh Kumar K.V | e34aa03 | 2015-12-01 09:06:53 +0530 | [diff] [blame] | 486 | #else |
| 487 | static void native_hugepage_invalidate(unsigned long vsid, |
| 488 | unsigned long addr, |
| 489 | unsigned char *hpte_slot_array, |
| 490 | int psize, int ssize, int local) |
| 491 | { |
| 492 | WARN(1, "%s called without THP support\n", __func__); |
| 493 | } |
| 494 | #endif |
Aneesh Kumar K.V | 1a52728 | 2013-06-20 14:30:27 +0530 | [diff] [blame] | 495 | |
Aneesh Kumar K.V | db3d853 | 2013-06-20 14:30:13 +0530 | [diff] [blame] | 496 | static inline int __hpte_actual_psize(unsigned int lp, int psize) |
| 497 | { |
| 498 | int i, shift; |
| 499 | unsigned int mask; |
| 500 | |
| 501 | /* start from 1 ignoring MMU_PAGE_4K */ |
| 502 | for (i = 1; i < MMU_PAGE_COUNT; i++) { |
| 503 | |
| 504 | /* invalid penc */ |
| 505 | if (mmu_psize_defs[psize].penc[i] == -1) |
| 506 | continue; |
| 507 | /* |
| 508 | * encoding bits per actual page size |
| 509 | * PTE LP actual page size |
| 510 | * rrrr rrrz >=8KB |
| 511 | * rrrr rrzz >=16KB |
| 512 | * rrrr rzzz >=32KB |
| 513 | * rrrr zzzz >=64KB |
| 514 | * ....... |
| 515 | */ |
| 516 | shift = mmu_psize_defs[i].shift - LP_SHIFT; |
| 517 | if (shift > LP_BITS) |
| 518 | shift = LP_BITS; |
| 519 | mask = (1 << shift) - 1; |
| 520 | if ((lp & mask) == mmu_psize_defs[psize].penc[i]) |
| 521 | return i; |
| 522 | } |
| 523 | return -1; |
| 524 | } |
| 525 | |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 526 | static void hpte_decode(struct hash_pte *hpte, unsigned long slot, |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 527 | int *psize, int *apsize, int *ssize, unsigned long *vpn) |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 528 | { |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 529 | unsigned long avpn, pteg, vpi; |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 530 | unsigned long hpte_v = be64_to_cpu(hpte->v); |
| 531 | unsigned long hpte_r = be64_to_cpu(hpte->r); |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 532 | unsigned long vsid, seg_off; |
Aneesh Kumar K.V | 7e74c39 | 2013-04-28 09:37:36 +0000 | [diff] [blame] | 533 | int size, a_size, shift; |
| 534 | /* Look at the 8 bit LP value */ |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 535 | unsigned int lp = (hpte_r >> LP_SHIFT) & ((1 << LP_BITS) - 1); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 536 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 537 | if (!(hpte_v & HPTE_V_LARGE)) { |
| 538 | size = MMU_PAGE_4K; |
| 539 | a_size = MMU_PAGE_4K; |
| 540 | } else { |
Luke Browning | 71bf08b | 2007-05-03 00:19:11 +1000 | [diff] [blame] | 541 | for (size = 0; size < MMU_PAGE_COUNT; size++) { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 542 | |
Luke Browning | 71bf08b | 2007-05-03 00:19:11 +1000 | [diff] [blame] | 543 | /* valid entries have a shift value */ |
| 544 | if (!mmu_psize_defs[size].shift) |
| 545 | continue; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 546 | |
Aneesh Kumar K.V | 7e74c39 | 2013-04-28 09:37:36 +0000 | [diff] [blame] | 547 | a_size = __hpte_actual_psize(lp, size); |
| 548 | if (a_size != -1) |
| 549 | break; |
Luke Browning | 71bf08b | 2007-05-03 00:19:11 +1000 | [diff] [blame] | 550 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
Paul Mackerras | 2454c7e | 2007-05-10 15:28:44 +1000 | [diff] [blame] | 552 | /* This works for all page sizes, and for 256M and 1T segments */ |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 553 | *ssize = hpte_v >> HPTE_V_SSIZE_SHIFT; |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 554 | shift = mmu_psize_defs[size].shift; |
| 555 | |
| 556 | avpn = (HPTE_V_AVPN_VAL(hpte_v) & ~mmu_psize_defs[size].avpnm); |
| 557 | pteg = slot / HPTES_PER_GROUP; |
| 558 | if (hpte_v & HPTE_V_SECONDARY) |
| 559 | pteg = ~pteg; |
| 560 | |
| 561 | switch (*ssize) { |
| 562 | case MMU_SEGSIZE_256M: |
| 563 | /* We only have 28 - 23 bits of seg_off in avpn */ |
| 564 | seg_off = (avpn & 0x1f) << 23; |
| 565 | vsid = avpn >> 5; |
| 566 | /* We can find more bits from the pteg value */ |
| 567 | if (shift < 23) { |
| 568 | vpi = (vsid ^ pteg) & htab_hash_mask; |
| 569 | seg_off |= vpi << shift; |
| 570 | } |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 571 | *vpn = vsid << (SID_SHIFT - VPN_SHIFT) | seg_off >> VPN_SHIFT; |
Aneesh Kumar K.V | 83383b7 | 2013-07-03 13:50:03 +0530 | [diff] [blame] | 572 | break; |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 573 | case MMU_SEGSIZE_1T: |
| 574 | /* We only have 40 - 23 bits of seg_off in avpn */ |
| 575 | seg_off = (avpn & 0x1ffff) << 23; |
| 576 | vsid = avpn >> 17; |
| 577 | if (shift < 23) { |
| 578 | vpi = (vsid ^ (vsid << 25) ^ pteg) & htab_hash_mask; |
| 579 | seg_off |= vpi << shift; |
| 580 | } |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 581 | *vpn = vsid << (SID_SHIFT_1T - VPN_SHIFT) | seg_off >> VPN_SHIFT; |
Aneesh Kumar K.V | 83383b7 | 2013-07-03 13:50:03 +0530 | [diff] [blame] | 582 | break; |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 583 | default: |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 584 | *vpn = size = 0; |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 585 | } |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 586 | *psize = size; |
| 587 | *apsize = a_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
| 589 | |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 590 | /* |
| 591 | * clear all mappings on kexec. All cpus are in real mode (or they will |
| 592 | * be when they isi), and we are the only one left. We rely on our kernel |
| 593 | * mapping being 0xC0's and the hardware ignoring those two real bits. |
| 594 | * |
Cyril Bur | fdf880a | 2015-10-08 11:04:26 +1100 | [diff] [blame] | 595 | * This must be called with interrupts disabled. |
| 596 | * |
| 597 | * Taking the native_tlbie_lock is unsafe here due to the possibility of |
| 598 | * lockdep being on. On pre POWER5 hardware, not taking the lock could |
| 599 | * cause deadlock. POWER5 and newer not taking the lock is fine. This only |
| 600 | * gets called during boot before secondary CPUs have come up and during |
| 601 | * crashdump and all bets are off anyway. |
| 602 | * |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 603 | * TODO: add batching support when enabled. remember, no dynamic memory here, |
| 604 | * athough there is the control page available... |
| 605 | */ |
| 606 | static void native_hpte_clear(void) |
| 607 | { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 608 | unsigned long vpn = 0; |
Cyril Bur | fdf880a | 2015-10-08 11:04:26 +1100 | [diff] [blame] | 609 | unsigned long slot, slots; |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 610 | struct hash_pte *hptep = htab_address; |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 611 | unsigned long hpte_v; |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 612 | unsigned long pteg_count; |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 613 | int psize, apsize, ssize; |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 614 | |
| 615 | pteg_count = htab_hash_mask + 1; |
| 616 | |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 617 | slots = pteg_count * HPTES_PER_GROUP; |
| 618 | |
| 619 | for (slot = 0; slot < slots; slot++, hptep++) { |
| 620 | /* |
| 621 | * we could lock the pte here, but we are the only cpu |
| 622 | * running, right? and for crash dump, we probably |
| 623 | * don't want to wait for a maybe bad cpu. |
| 624 | */ |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 625 | hpte_v = be64_to_cpu(hptep->v); |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 626 | |
R Sharada | 47f78a4 | 2006-02-22 21:43:08 +0530 | [diff] [blame] | 627 | /* |
Cyril Bur | fdf880a | 2015-10-08 11:04:26 +1100 | [diff] [blame] | 628 | * Call __tlbie() here rather than tlbie() since we can't take the |
| 629 | * native_tlbie_lock. |
R Sharada | 47f78a4 | 2006-02-22 21:43:08 +0530 | [diff] [blame] | 630 | */ |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 631 | if (hpte_v & HPTE_V_VALID) { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 632 | hpte_decode(hptep, slot, &psize, &apsize, &ssize, &vpn); |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 633 | hptep->v = 0; |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 634 | __tlbie(vpn, psize, apsize, ssize); |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 635 | } |
| 636 | } |
| 637 | |
R Sharada | 47f78a4 | 2006-02-22 21:43:08 +0530 | [diff] [blame] | 638 | asm volatile("eieio; tlbsync; ptesync":::"memory"); |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 639 | } |
| 640 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 641 | /* |
| 642 | * Batched hash table flush, we batch the tlbie's to avoid taking/releasing |
| 643 | * the lock all the time |
| 644 | */ |
Benjamin Herrenschmidt | 61b1a94 | 2005-09-20 13:52:50 +1000 | [diff] [blame] | 645 | static void native_flush_hash_range(unsigned long number, int local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 647 | unsigned long vpn; |
| 648 | unsigned long hash, index, hidx, shift, slot; |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 649 | struct hash_pte *hptep; |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 650 | unsigned long hpte_v; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 651 | unsigned long want_v; |
| 652 | unsigned long flags; |
| 653 | real_pte_t pte; |
Christoph Lameter | 69111ba | 2014-10-21 15:23:25 -0500 | [diff] [blame] | 654 | struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 655 | unsigned long psize = batch->psize; |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 656 | int ssize = batch->ssize; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 657 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
| 659 | local_irq_save(flags); |
| 660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | for (i = 0; i < number; i++) { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 662 | vpn = batch->vpn[i]; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 663 | pte = batch->pte[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 665 | pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { |
| 666 | hash = hpt_hash(vpn, shift, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 667 | hidx = __rpte_to_hidx(pte, index); |
| 668 | if (hidx & _PTEIDX_SECONDARY) |
| 669 | hash = ~hash; |
| 670 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; |
| 671 | slot += hidx & _PTEIDX_GROUP_IX; |
| 672 | hptep = htab_address + slot; |
Aneesh Kumar K.V | 74f227b | 2013-04-28 09:37:34 +0000 | [diff] [blame] | 673 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 674 | native_lock_hpte(hptep); |
Anton Blanchard | 12f04f2 | 2013-09-23 12:04:36 +1000 | [diff] [blame] | 675 | hpte_v = be64_to_cpu(hptep->v); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 676 | if (!HPTE_V_COMPARE(hpte_v, want_v) || |
| 677 | !(hpte_v & HPTE_V_VALID)) |
| 678 | native_unlock_hpte(hptep); |
| 679 | else |
| 680 | hptep->v = 0; |
| 681 | } pte_iterate_hashed_end(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | } |
| 683 | |
Matt Evans | 44ae3ab | 2011-04-06 19:48:50 +0000 | [diff] [blame] | 684 | if (mmu_has_feature(MMU_FTR_TLBIEL) && |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 685 | mmu_psize_defs[psize].tlbiel && local) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | asm volatile("ptesync":::"memory"); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 687 | for (i = 0; i < number; i++) { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 688 | vpn = batch->vpn[i]; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 689 | pte = batch->pte[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 691 | pte_iterate_hashed_subpages(pte, psize, |
| 692 | vpn, index, shift) { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 693 | __tlbiel(vpn, psize, psize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 694 | } pte_iterate_hashed_end(); |
| 695 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | asm volatile("ptesync":::"memory"); |
| 697 | } else { |
Matt Evans | 44ae3ab | 2011-04-06 19:48:50 +0000 | [diff] [blame] | 698 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
| 700 | if (lock_tlbie) |
Thomas Gleixner | 6b9c9b8 | 2010-02-18 02:22:35 +0000 | [diff] [blame] | 701 | raw_spin_lock(&native_tlbie_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
| 703 | asm volatile("ptesync":::"memory"); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 704 | for (i = 0; i < number; i++) { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 705 | vpn = batch->vpn[i]; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 706 | pte = batch->pte[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 708 | pte_iterate_hashed_subpages(pte, psize, |
| 709 | vpn, index, shift) { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 710 | __tlbie(vpn, psize, psize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 711 | } pte_iterate_hashed_end(); |
| 712 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | asm volatile("eieio; tlbsync; ptesync":::"memory"); |
| 714 | |
| 715 | if (lock_tlbie) |
Thomas Gleixner | 6b9c9b8 | 2010-02-18 02:22:35 +0000 | [diff] [blame] | 716 | raw_spin_unlock(&native_tlbie_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | } |
| 718 | |
| 719 | local_irq_restore(flags); |
| 720 | } |
| 721 | |
Michael Ellerman | 7d0daae | 2006-06-23 18:16:38 +1000 | [diff] [blame] | 722 | void __init hpte_init_native(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | { |
| 724 | ppc_md.hpte_invalidate = native_hpte_invalidate; |
| 725 | ppc_md.hpte_updatepp = native_hpte_updatepp; |
| 726 | ppc_md.hpte_updateboltedpp = native_hpte_updateboltedpp; |
| 727 | ppc_md.hpte_insert = native_hpte_insert; |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 728 | ppc_md.hpte_remove = native_hpte_remove; |
| 729 | ppc_md.hpte_clear_all = native_hpte_clear; |
Michael Ellerman | 8e16699 | 2012-09-20 22:08:28 +0000 | [diff] [blame] | 730 | ppc_md.flush_hash_range = native_flush_hash_range; |
Aneesh Kumar K.V | 1a52728 | 2013-06-20 14:30:27 +0530 | [diff] [blame] | 731 | ppc_md.hugepage_invalidate = native_hugepage_invalidate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | } |