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 | |
| 32 | #ifdef DEBUG_LOW |
| 33 | #define DBG_LOW(fmt...) udbg_printf(fmt) |
| 34 | #else |
| 35 | #define DBG_LOW(fmt...) |
| 36 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #define HPTE_LOCK_BIT 3 |
| 39 | |
Paul Mackerras | 9e368f2 | 2011-06-29 00:40:08 +0000 | [diff] [blame] | 40 | DEFINE_RAW_SPINLOCK(native_tlbie_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 42 | 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] | 43 | { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 44 | unsigned long va; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 45 | unsigned int penc; |
| 46 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 47 | /* |
| 48 | * We need 14 to 65 bits of va for a tlibe of 4K page |
| 49 | * With vpn we ignore the lower VPN_SHIFT bits already. |
| 50 | * And top two bits are already ignored because we can |
| 51 | * only accomadate 76 bits in a 64 bit vpn with a VPN_SHIFT |
| 52 | * of 12. |
| 53 | */ |
| 54 | va = vpn << VPN_SHIFT; |
| 55 | /* |
| 56 | * clear top 16 bits of 64bit va, non SLS segment |
| 57 | * Older versions of the architecture (2.02 and earler) require the |
| 58 | * masking of the top 16 bits. |
| 59 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 60 | va &= ~(0xffffULL << 48); |
| 61 | |
| 62 | switch (psize) { |
| 63 | case MMU_PAGE_4K: |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 64 | va |= ssize << 8; |
Michael Neuling | a32e252 | 2011-04-06 18:23:29 +0000 | [diff] [blame] | 65 | 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] | 66 | : : "r" (va), "r"(0), "i" (CPU_FTR_ARCH_206) |
Milton Miller | 60dbf43 | 2009-04-29 20:58:01 +0000 | [diff] [blame] | 67 | : "memory"); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 68 | break; |
| 69 | default: |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 70 | /* We need 14 to 14 + i bits of va */ |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 71 | penc = mmu_psize_defs[psize].penc[apsize]; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 72 | va &= ~((1ul << mmu_psize_defs[psize].shift) - 1); |
Arnd Bergmann | 19242b2 | 2006-06-15 21:15:44 +1000 | [diff] [blame] | 73 | va |= penc << 12; |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 74 | va |= ssize << 8; |
Milton Miller | 60dbf43 | 2009-04-29 20:58:01 +0000 | [diff] [blame] | 75 | va |= 1; /* L */ |
Michael Neuling | a32e252 | 2011-04-06 18:23:29 +0000 | [diff] [blame] | 76 | 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] | 77 | : : "r" (va), "r"(0), "i" (CPU_FTR_ARCH_206) |
Milton Miller | 60dbf43 | 2009-04-29 20:58:01 +0000 | [diff] [blame] | 78 | : "memory"); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 79 | break; |
| 80 | } |
| 81 | } |
| 82 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 83 | 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] | 84 | { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 85 | unsigned long va; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 86 | unsigned int penc; |
| 87 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 88 | /* VPN_SHIFT can be atmost 12 */ |
| 89 | va = vpn << VPN_SHIFT; |
| 90 | /* |
| 91 | * clear top 16 bits of 64 bit va, non SLS segment |
| 92 | * Older versions of the architecture (2.02 and earler) require the |
| 93 | * masking of the top 16 bits. |
| 94 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 95 | va &= ~(0xffffULL << 48); |
| 96 | |
| 97 | switch (psize) { |
| 98 | case MMU_PAGE_4K: |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 99 | va |= ssize << 8; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 100 | asm volatile(".long 0x7c000224 | (%0 << 11) | (0 << 21)" |
| 101 | : : "r"(va) : "memory"); |
| 102 | break; |
| 103 | default: |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 104 | /* We need 14 to 14 + i bits of va */ |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 105 | penc = mmu_psize_defs[psize].penc[apsize]; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 106 | va &= ~((1ul << mmu_psize_defs[psize].shift) - 1); |
Arnd Bergmann | 19242b2 | 2006-06-15 21:15:44 +1000 | [diff] [blame] | 107 | va |= penc << 12; |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 108 | va |= ssize << 8; |
Milton Miller | 60dbf43 | 2009-04-29 20:58:01 +0000 | [diff] [blame] | 109 | va |= 1; /* L */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 110 | asm volatile(".long 0x7c000224 | (%0 << 11) | (1 << 21)" |
| 111 | : : "r"(va) : "memory"); |
| 112 | break; |
| 113 | } |
| 114 | |
| 115 | } |
| 116 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 117 | static inline void tlbie(unsigned long vpn, int psize, int apsize, |
| 118 | int ssize, int local) |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 119 | { |
Matt Evans | 44ae3ab | 2011-04-06 19:48:50 +0000 | [diff] [blame] | 120 | unsigned int use_local = local && mmu_has_feature(MMU_FTR_TLBIEL); |
| 121 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 122 | |
| 123 | if (use_local) |
| 124 | use_local = mmu_psize_defs[psize].tlbiel; |
| 125 | if (lock_tlbie && !use_local) |
Thomas Gleixner | 6b9c9b8 | 2010-02-18 02:22:35 +0000 | [diff] [blame] | 126 | raw_spin_lock(&native_tlbie_lock); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 127 | asm volatile("ptesync": : :"memory"); |
| 128 | if (use_local) { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 129 | __tlbiel(vpn, psize, apsize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 130 | asm volatile("ptesync": : :"memory"); |
| 131 | } else { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 132 | __tlbie(vpn, psize, apsize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 133 | asm volatile("eieio; tlbsync; ptesync": : :"memory"); |
| 134 | } |
| 135 | if (lock_tlbie && !use_local) |
Thomas Gleixner | 6b9c9b8 | 2010-02-18 02:22:35 +0000 | [diff] [blame] | 136 | raw_spin_unlock(&native_tlbie_lock); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 137 | } |
| 138 | |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 139 | static inline void native_lock_hpte(struct hash_pte *hptep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 141 | unsigned long *word = &hptep->v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | while (1) { |
Anton Blanchard | 66d99b8 | 2010-02-10 01:03:06 +0000 | [diff] [blame] | 144 | if (!test_and_set_bit_lock(HPTE_LOCK_BIT, word)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | break; |
| 146 | while(test_bit(HPTE_LOCK_BIT, word)) |
| 147 | cpu_relax(); |
| 148 | } |
| 149 | } |
| 150 | |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 151 | static inline void native_unlock_hpte(struct hash_pte *hptep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | { |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 153 | unsigned long *word = &hptep->v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Anton Blanchard | 66d99b8 | 2010-02-10 01:03:06 +0000 | [diff] [blame] | 155 | clear_bit_unlock(HPTE_LOCK_BIT, word); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 158 | static long native_hpte_insert(unsigned long hpte_group, unsigned long vpn, |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 159 | unsigned long pa, unsigned long rflags, |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 160 | unsigned long vflags, int psize, int apsize, int ssize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | { |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 162 | struct hash_pte *hptep = htab_address + hpte_group; |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 163 | unsigned long hpte_v, hpte_r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | int i; |
| 165 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 166 | if (!(vflags & HPTE_V_BOLTED)) { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 167 | DBG_LOW(" insert(group=%lx, vpn=%016lx, pa=%016lx," |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 168 | " rflags=%lx, vflags=%lx, psize=%d)\n", |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 169 | hpte_group, vpn, pa, rflags, vflags, psize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 170 | } |
| 171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | for (i = 0; i < HPTES_PER_GROUP; i++) { |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 173 | if (! (hptep->v & HPTE_V_VALID)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | /* retry with lock held */ |
| 175 | native_lock_hpte(hptep); |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 176 | if (! (hptep->v & HPTE_V_VALID)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | break; |
| 178 | native_unlock_hpte(hptep); |
| 179 | } |
| 180 | |
| 181 | hptep++; |
| 182 | } |
| 183 | |
| 184 | if (i == HPTES_PER_GROUP) |
| 185 | return -1; |
| 186 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 187 | hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID; |
| 188 | hpte_r = hpte_encode_r(pa, psize, apsize) | rflags; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 189 | |
| 190 | if (!(vflags & HPTE_V_BOLTED)) { |
| 191 | DBG_LOW(" i=%x hpte_v=%016lx, hpte_r=%016lx\n", |
| 192 | i, hpte_v, hpte_r); |
| 193 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 195 | hptep->r = hpte_r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | /* Guarantee the second dword is visible before the valid bit */ |
Kumar Gala | 74a0ba6 | 2007-07-09 23:49:09 -0500 | [diff] [blame] | 197 | eieio(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | /* |
| 199 | * Now set the first dword including the valid bit |
| 200 | * NOTE: this also unlocks the hpte |
| 201 | */ |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 202 | hptep->v = hpte_v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
| 204 | __asm__ __volatile__ ("ptesync" : : : "memory"); |
| 205 | |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 206 | return i | (!!(vflags & HPTE_V_SECONDARY) << 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | static long native_hpte_remove(unsigned long hpte_group) |
| 210 | { |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 211 | struct hash_pte *hptep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | int i; |
| 213 | int slot_offset; |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 214 | unsigned long hpte_v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 216 | DBG_LOW(" remove(group=%lx)\n", hpte_group); |
| 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | /* pick a random entry to start at */ |
| 219 | slot_offset = mftb() & 0x7; |
| 220 | |
| 221 | for (i = 0; i < HPTES_PER_GROUP; i++) { |
| 222 | hptep = htab_address + hpte_group + slot_offset; |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 223 | hpte_v = hptep->v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 225 | if ((hpte_v & HPTE_V_VALID) && !(hpte_v & HPTE_V_BOLTED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | /* retry with lock held */ |
| 227 | native_lock_hpte(hptep); |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 228 | hpte_v = hptep->v; |
| 229 | if ((hpte_v & HPTE_V_VALID) |
| 230 | && !(hpte_v & HPTE_V_BOLTED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | break; |
| 232 | native_unlock_hpte(hptep); |
| 233 | } |
| 234 | |
| 235 | slot_offset++; |
| 236 | slot_offset &= 0x7; |
| 237 | } |
| 238 | |
| 239 | if (i == HPTES_PER_GROUP) |
| 240 | return -1; |
| 241 | |
| 242 | /* Invalidate the hpte. NOTE: this also unlocks it */ |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 243 | hptep->v = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | return i; |
| 246 | } |
| 247 | |
Aneesh Kumar K.V | 7e74c39 | 2013-04-28 09:37:36 +0000 | [diff] [blame^] | 248 | static inline int __hpte_actual_psize(unsigned int lp, int psize) |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 249 | { |
| 250 | int i, shift; |
| 251 | unsigned int mask; |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 252 | |
| 253 | /* start from 1 ignoring MMU_PAGE_4K */ |
| 254 | for (i = 1; i < MMU_PAGE_COUNT; i++) { |
| 255 | |
| 256 | /* invalid penc */ |
| 257 | if (mmu_psize_defs[psize].penc[i] == -1) |
| 258 | continue; |
| 259 | /* |
| 260 | * encoding bits per actual page size |
| 261 | * PTE LP actual page size |
| 262 | * rrrr rrrz >=8KB |
| 263 | * rrrr rrzz >=16KB |
| 264 | * rrrr rzzz >=32KB |
| 265 | * rrrr zzzz >=64KB |
| 266 | * ....... |
| 267 | */ |
| 268 | shift = mmu_psize_defs[i].shift - LP_SHIFT; |
| 269 | if (shift > LP_BITS) |
| 270 | shift = LP_BITS; |
| 271 | mask = (1 << shift) - 1; |
| 272 | if ((lp & mask) == mmu_psize_defs[psize].penc[i]) |
| 273 | return i; |
| 274 | } |
| 275 | return -1; |
| 276 | } |
| 277 | |
Aneesh Kumar K.V | 7e74c39 | 2013-04-28 09:37:36 +0000 | [diff] [blame^] | 278 | static inline int hpte_actual_psize(struct hash_pte *hptep, int psize) |
| 279 | { |
| 280 | /* Look at the 8 bit LP value */ |
| 281 | unsigned int lp = (hptep->r >> LP_SHIFT) & ((1 << LP_BITS) - 1); |
| 282 | |
| 283 | if (!(hptep->v & HPTE_V_VALID)) |
| 284 | return -1; |
| 285 | |
| 286 | /* First check if it is large page */ |
| 287 | if (!(hptep->v & HPTE_V_LARGE)) |
| 288 | return MMU_PAGE_4K; |
| 289 | |
| 290 | return __hpte_actual_psize(lp, psize); |
| 291 | } |
| 292 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 293 | static long native_hpte_updatepp(unsigned long slot, unsigned long newpp, |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 294 | unsigned long vpn, int psize, int ssize, |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 295 | int local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | { |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 297 | struct hash_pte *hptep = htab_address + slot; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 298 | unsigned long hpte_v, want_v; |
| 299 | int ret = 0; |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 300 | int actual_psize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Aneesh Kumar K.V | 74f227b | 2013-04-28 09:37:34 +0000 | [diff] [blame] | 302 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 303 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 304 | DBG_LOW(" update(vpn=%016lx, avpnv=%016lx, group=%lx, newpp=%lx)", |
| 305 | vpn, want_v & HPTE_V_AVPN, slot, newpp); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 306 | |
| 307 | native_lock_hpte(hptep); |
| 308 | |
| 309 | hpte_v = hptep->v; |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 310 | actual_psize = hpte_actual_psize(hptep, psize); |
| 311 | if (actual_psize < 0) { |
| 312 | native_unlock_hpte(hptep); |
| 313 | return -1; |
| 314 | } |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 315 | /* Even if we miss, we need to invalidate the TLB */ |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 316 | if (!HPTE_V_COMPARE(hpte_v, want_v)) { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 317 | DBG_LOW(" -> miss\n"); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 318 | ret = -1; |
| 319 | } else { |
| 320 | DBG_LOW(" -> hit\n"); |
| 321 | /* Update the HPTE */ |
| 322 | hptep->r = (hptep->r & ~(HPTE_R_PP | HPTE_R_N)) | |
Benjamin Herrenschmidt | c5cf0e3 | 2006-05-30 14:14:19 +1000 | [diff] [blame] | 323 | (newpp & (HPTE_R_PP | HPTE_R_N | HPTE_R_C)); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 324 | } |
Jon Tollefson | 3f1df7a | 2007-05-18 04:49:22 +1000 | [diff] [blame] | 325 | native_unlock_hpte(hptep); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 326 | |
| 327 | /* Ensure it is out of the tlb too. */ |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 328 | tlbie(vpn, psize, actual_psize, ssize, local); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 329 | |
| 330 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | } |
| 332 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 333 | static long native_hpte_find(unsigned long vpn, int psize, int ssize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | { |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 335 | struct hash_pte *hptep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | unsigned long hash; |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 337 | unsigned long i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | long slot; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 339 | unsigned long want_v, hpte_v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 341 | hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); |
Aneesh Kumar K.V | 74f227b | 2013-04-28 09:37:34 +0000 | [diff] [blame] | 342 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 344 | /* Bolted mappings are only ever in the primary group */ |
| 345 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; |
| 346 | for (i = 0; i < HPTES_PER_GROUP; i++) { |
| 347 | hptep = htab_address + slot; |
| 348 | hpte_v = hptep->v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 350 | if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) |
| 351 | /* HPTE matches */ |
| 352 | return slot; |
| 353 | ++slot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | return -1; |
| 357 | } |
| 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | /* |
| 360 | * Update the page protection bits. Intended to be used to create |
| 361 | * guard pages for kernel data structures on pages which are bolted |
| 362 | * in the HPT. Assumes pages being operated on will not be stolen. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | * |
| 364 | * No need to lock here because we should be the only user. |
| 365 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 366 | static void native_hpte_updateboltedpp(unsigned long newpp, unsigned long ea, |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 367 | int psize, int ssize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 369 | int actual_psize; |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 370 | unsigned long vpn; |
| 371 | unsigned long vsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | long slot; |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 373 | struct hash_pte *hptep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 375 | vsid = get_kernel_vsid(ea, ssize); |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 376 | vpn = hpt_vpn(ea, vsid, ssize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 378 | slot = native_hpte_find(vpn, psize, ssize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | if (slot == -1) |
| 380 | panic("could not find page to bolt\n"); |
| 381 | hptep = htab_address + slot; |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 382 | actual_psize = hpte_actual_psize(hptep, psize); |
| 383 | if (actual_psize < 0) |
| 384 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 386 | /* Update the HPTE */ |
| 387 | hptep->r = (hptep->r & ~(HPTE_R_PP | HPTE_R_N)) | |
| 388 | (newpp & (HPTE_R_PP | HPTE_R_N)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 390 | /* Ensure it is out of the tlb too. */ |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 391 | tlbie(vpn, psize, actual_psize, ssize, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | } |
| 393 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 394 | static void native_hpte_invalidate(unsigned long slot, unsigned long vpn, |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 395 | int psize, int ssize, int local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | { |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 397 | struct hash_pte *hptep = htab_address + slot; |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 398 | unsigned long hpte_v; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 399 | unsigned long want_v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | unsigned long flags; |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 401 | int actual_psize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
| 403 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 405 | DBG_LOW(" invalidate(vpn=%016lx, hash: %lx)\n", vpn, slot); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 406 | |
Aneesh Kumar K.V | 74f227b | 2013-04-28 09:37:34 +0000 | [diff] [blame] | 407 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 408 | native_lock_hpte(hptep); |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 409 | hpte_v = hptep->v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 411 | actual_psize = hpte_actual_psize(hptep, psize); |
| 412 | if (actual_psize < 0) { |
| 413 | native_unlock_hpte(hptep); |
| 414 | local_irq_restore(flags); |
| 415 | return; |
| 416 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | /* Even if we miss, we need to invalidate the TLB */ |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 418 | if (!HPTE_V_COMPARE(hpte_v, want_v)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | native_unlock_hpte(hptep); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 420 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | /* Invalidate the hpte. NOTE: this also unlocks it */ |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 422 | hptep->v = 0; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 423 | |
| 424 | /* Invalidate the TLB */ |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 425 | tlbie(vpn, psize, actual_psize, ssize, local); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 426 | |
| 427 | local_irq_restore(flags); |
| 428 | } |
| 429 | |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 430 | 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] | 431 | int *psize, int *apsize, int *ssize, unsigned long *vpn) |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 432 | { |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 433 | unsigned long avpn, pteg, vpi; |
Luke Browning | 71bf08b | 2007-05-03 00:19:11 +1000 | [diff] [blame] | 434 | unsigned long hpte_v = hpte->v; |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 435 | unsigned long vsid, seg_off; |
Aneesh Kumar K.V | 7e74c39 | 2013-04-28 09:37:36 +0000 | [diff] [blame^] | 436 | int size, a_size, shift; |
| 437 | /* Look at the 8 bit LP value */ |
| 438 | unsigned int lp = (hpte->r >> LP_SHIFT) & ((1 << LP_BITS) - 1); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 439 | |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 440 | if (!(hpte_v & HPTE_V_LARGE)) { |
| 441 | size = MMU_PAGE_4K; |
| 442 | a_size = MMU_PAGE_4K; |
| 443 | } else { |
Luke Browning | 71bf08b | 2007-05-03 00:19:11 +1000 | [diff] [blame] | 444 | for (size = 0; size < MMU_PAGE_COUNT; size++) { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 445 | |
Luke Browning | 71bf08b | 2007-05-03 00:19:11 +1000 | [diff] [blame] | 446 | /* valid entries have a shift value */ |
| 447 | if (!mmu_psize_defs[size].shift) |
| 448 | continue; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 449 | |
Aneesh Kumar K.V | 7e74c39 | 2013-04-28 09:37:36 +0000 | [diff] [blame^] | 450 | a_size = __hpte_actual_psize(lp, size); |
| 451 | if (a_size != -1) |
| 452 | break; |
Luke Browning | 71bf08b | 2007-05-03 00:19:11 +1000 | [diff] [blame] | 453 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | } |
Paul Mackerras | 2454c7e | 2007-05-10 15:28:44 +1000 | [diff] [blame] | 455 | /* This works for all page sizes, and for 256M and 1T segments */ |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 456 | *ssize = hpte_v >> HPTE_V_SSIZE_SHIFT; |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 457 | shift = mmu_psize_defs[size].shift; |
| 458 | |
| 459 | avpn = (HPTE_V_AVPN_VAL(hpte_v) & ~mmu_psize_defs[size].avpnm); |
| 460 | pteg = slot / HPTES_PER_GROUP; |
| 461 | if (hpte_v & HPTE_V_SECONDARY) |
| 462 | pteg = ~pteg; |
| 463 | |
| 464 | switch (*ssize) { |
| 465 | case MMU_SEGSIZE_256M: |
| 466 | /* We only have 28 - 23 bits of seg_off in avpn */ |
| 467 | seg_off = (avpn & 0x1f) << 23; |
| 468 | vsid = avpn >> 5; |
| 469 | /* We can find more bits from the pteg value */ |
| 470 | if (shift < 23) { |
| 471 | vpi = (vsid ^ pteg) & htab_hash_mask; |
| 472 | seg_off |= vpi << shift; |
| 473 | } |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 474 | *vpn = vsid << (SID_SHIFT - VPN_SHIFT) | seg_off >> VPN_SHIFT; |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 475 | case MMU_SEGSIZE_1T: |
| 476 | /* We only have 40 - 23 bits of seg_off in avpn */ |
| 477 | seg_off = (avpn & 0x1ffff) << 23; |
| 478 | vsid = avpn >> 17; |
| 479 | if (shift < 23) { |
| 480 | vpi = (vsid ^ (vsid << 25) ^ pteg) & htab_hash_mask; |
| 481 | seg_off |= vpi << shift; |
| 482 | } |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 483 | *vpn = vsid << (SID_SHIFT_1T - VPN_SHIFT) | seg_off >> VPN_SHIFT; |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 484 | default: |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 485 | *vpn = size = 0; |
Aneesh Kumar K.V | dcda287 | 2012-09-10 02:52:49 +0000 | [diff] [blame] | 486 | } |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 487 | *psize = size; |
| 488 | *apsize = a_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | } |
| 490 | |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 491 | /* |
| 492 | * clear all mappings on kexec. All cpus are in real mode (or they will |
| 493 | * be when they isi), and we are the only one left. We rely on our kernel |
| 494 | * mapping being 0xC0's and the hardware ignoring those two real bits. |
| 495 | * |
| 496 | * TODO: add batching support when enabled. remember, no dynamic memory here, |
| 497 | * athough there is the control page available... |
| 498 | */ |
| 499 | static void native_hpte_clear(void) |
| 500 | { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 501 | unsigned long vpn = 0; |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 502 | unsigned long slot, slots, flags; |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 503 | struct hash_pte *hptep = htab_address; |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 504 | unsigned long hpte_v; |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 505 | unsigned long pteg_count; |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 506 | int psize, apsize, ssize; |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 507 | |
| 508 | pteg_count = htab_hash_mask + 1; |
| 509 | |
| 510 | local_irq_save(flags); |
| 511 | |
| 512 | /* we take the tlbie lock and hold it. Some hardware will |
| 513 | * deadlock if we try to tlbie from two processors at once. |
| 514 | */ |
Thomas Gleixner | 6b9c9b8 | 2010-02-18 02:22:35 +0000 | [diff] [blame] | 515 | raw_spin_lock(&native_tlbie_lock); |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 516 | |
| 517 | slots = pteg_count * HPTES_PER_GROUP; |
| 518 | |
| 519 | for (slot = 0; slot < slots; slot++, hptep++) { |
| 520 | /* |
| 521 | * we could lock the pte here, but we are the only cpu |
| 522 | * running, right? and for crash dump, we probably |
| 523 | * don't want to wait for a maybe bad cpu. |
| 524 | */ |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 525 | hpte_v = hptep->v; |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 526 | |
R Sharada | 47f78a4 | 2006-02-22 21:43:08 +0530 | [diff] [blame] | 527 | /* |
| 528 | * Call __tlbie() here rather than tlbie() since we |
| 529 | * already hold the native_tlbie_lock. |
| 530 | */ |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 531 | if (hpte_v & HPTE_V_VALID) { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 532 | hpte_decode(hptep, slot, &psize, &apsize, &ssize, &vpn); |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 533 | hptep->v = 0; |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 534 | __tlbie(vpn, psize, apsize, ssize); |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 535 | } |
| 536 | } |
| 537 | |
R Sharada | 47f78a4 | 2006-02-22 21:43:08 +0530 | [diff] [blame] | 538 | asm volatile("eieio; tlbsync; ptesync":::"memory"); |
Thomas Gleixner | 6b9c9b8 | 2010-02-18 02:22:35 +0000 | [diff] [blame] | 539 | raw_spin_unlock(&native_tlbie_lock); |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 540 | local_irq_restore(flags); |
| 541 | } |
| 542 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 543 | /* |
| 544 | * Batched hash table flush, we batch the tlbie's to avoid taking/releasing |
| 545 | * the lock all the time |
| 546 | */ |
Benjamin Herrenschmidt | 61b1a94 | 2005-09-20 13:52:50 +1000 | [diff] [blame] | 547 | static void native_flush_hash_range(unsigned long number, int local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 549 | unsigned long vpn; |
| 550 | unsigned long hash, index, hidx, shift, slot; |
David Gibson | 8e561e7 | 2007-06-13 14:52:56 +1000 | [diff] [blame] | 551 | struct hash_pte *hptep; |
David Gibson | 96e2844 | 2005-07-13 01:11:42 -0700 | [diff] [blame] | 552 | unsigned long hpte_v; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 553 | unsigned long want_v; |
| 554 | unsigned long flags; |
| 555 | real_pte_t pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 557 | unsigned long psize = batch->psize; |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 558 | int ssize = batch->ssize; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 559 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | |
| 561 | local_irq_save(flags); |
| 562 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | for (i = 0; i < number; i++) { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 564 | vpn = batch->vpn[i]; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 565 | pte = batch->pte[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 567 | pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) { |
| 568 | hash = hpt_hash(vpn, shift, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 569 | hidx = __rpte_to_hidx(pte, index); |
| 570 | if (hidx & _PTEIDX_SECONDARY) |
| 571 | hash = ~hash; |
| 572 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; |
| 573 | slot += hidx & _PTEIDX_GROUP_IX; |
| 574 | hptep = htab_address + slot; |
Aneesh Kumar K.V | 74f227b | 2013-04-28 09:37:34 +0000 | [diff] [blame] | 575 | want_v = hpte_encode_avpn(vpn, psize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 576 | native_lock_hpte(hptep); |
| 577 | hpte_v = hptep->v; |
| 578 | if (!HPTE_V_COMPARE(hpte_v, want_v) || |
| 579 | !(hpte_v & HPTE_V_VALID)) |
| 580 | native_unlock_hpte(hptep); |
| 581 | else |
| 582 | hptep->v = 0; |
| 583 | } pte_iterate_hashed_end(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | } |
| 585 | |
Matt Evans | 44ae3ab | 2011-04-06 19:48:50 +0000 | [diff] [blame] | 586 | if (mmu_has_feature(MMU_FTR_TLBIEL) && |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 587 | mmu_psize_defs[psize].tlbiel && local) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | asm volatile("ptesync":::"memory"); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 589 | for (i = 0; i < number; i++) { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 590 | vpn = batch->vpn[i]; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 591 | pte = batch->pte[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 593 | pte_iterate_hashed_subpages(pte, psize, |
| 594 | vpn, index, shift) { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 595 | __tlbiel(vpn, psize, psize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 596 | } pte_iterate_hashed_end(); |
| 597 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | asm volatile("ptesync":::"memory"); |
| 599 | } else { |
Matt Evans | 44ae3ab | 2011-04-06 19:48:50 +0000 | [diff] [blame] | 600 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | |
| 602 | if (lock_tlbie) |
Thomas Gleixner | 6b9c9b8 | 2010-02-18 02:22:35 +0000 | [diff] [blame] | 603 | raw_spin_lock(&native_tlbie_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
| 605 | asm volatile("ptesync":::"memory"); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 606 | for (i = 0; i < number; i++) { |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 607 | vpn = batch->vpn[i]; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 608 | pte = batch->pte[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Aneesh Kumar K.V | 5524a27 | 2012-09-10 02:52:50 +0000 | [diff] [blame] | 610 | pte_iterate_hashed_subpages(pte, psize, |
| 611 | vpn, index, shift) { |
Aneesh Kumar K.V | b1022fb | 2013-04-28 09:37:35 +0000 | [diff] [blame] | 612 | __tlbie(vpn, psize, psize, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 613 | } pte_iterate_hashed_end(); |
| 614 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | asm volatile("eieio; tlbsync; ptesync":::"memory"); |
| 616 | |
| 617 | if (lock_tlbie) |
Thomas Gleixner | 6b9c9b8 | 2010-02-18 02:22:35 +0000 | [diff] [blame] | 618 | raw_spin_unlock(&native_tlbie_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | local_irq_restore(flags); |
| 622 | } |
| 623 | |
Michael Ellerman | 7d0daae | 2006-06-23 18:16:38 +1000 | [diff] [blame] | 624 | void __init hpte_init_native(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | { |
| 626 | ppc_md.hpte_invalidate = native_hpte_invalidate; |
| 627 | ppc_md.hpte_updatepp = native_hpte_updatepp; |
| 628 | ppc_md.hpte_updateboltedpp = native_hpte_updateboltedpp; |
| 629 | ppc_md.hpte_insert = native_hpte_insert; |
R Sharada | f4c82d5 | 2005-06-25 14:58:08 -0700 | [diff] [blame] | 630 | ppc_md.hpte_remove = native_hpte_remove; |
| 631 | ppc_md.hpte_clear_all = native_hpte_clear; |
Michael Ellerman | 8e16699 | 2012-09-20 22:08:28 +0000 | [diff] [blame] | 632 | ppc_md.flush_hash_range = native_flush_hash_range; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |