1 /* 2 * PS3 pagetable management routines. 3 * 4 * Copyright (C) 2006 Sony Computer Entertainment Inc. 5 * Copyright 2006, 2007 Sony Corporation 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; version 2 of the License. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21 #include <linux/kernel.h> 22 23 #include <asm/machdep.h> 24 #include <asm/lmb.h> 25 #include <asm/udbg.h> 26 #include <asm/lv1call.h> 27 #include <asm/ps3fb.h> 28 29 #include "platform.h" 30 31 #if defined(DEBUG) 32 #define DBG udbg_printf 33 #else 34 #define DBG pr_debug 35 #endif 36 37 static struct hash_pte *htab; 38 static unsigned long htab_addr; 39 static unsigned char *bolttab; 40 static unsigned char *inusetab; 41 42 static DEFINE_SPINLOCK(ps3_bolttab_lock); 43 44 #define debug_dump_hpte(_a, _b, _c, _d, _e, _f, _g) \ 45 _debug_dump_hpte(_a, _b, _c, _d, _e, _f, _g, __func__, __LINE__) 46 static void _debug_dump_hpte(unsigned long pa, unsigned long va, 47 unsigned long group, unsigned long bitmap, struct hash_pte lhpte, 48 int psize, unsigned long slot, const char* func, int line) 49 { 50 DBG("%s:%d: pa = %lxh\n", func, line, pa); 51 DBG("%s:%d: lpar = %lxh\n", func, line, 52 ps3_mm_phys_to_lpar(pa)); 53 DBG("%s:%d: va = %lxh\n", func, line, va); 54 DBG("%s:%d: group = %lxh\n", func, line, group); 55 DBG("%s:%d: bitmap = %lxh\n", func, line, bitmap); 56 DBG("%s:%d: hpte.v = %lxh\n", func, line, lhpte.v); 57 DBG("%s:%d: hpte.r = %lxh\n", func, line, lhpte.r); 58 DBG("%s:%d: psize = %xh\n", func, line, psize); 59 DBG("%s:%d: slot = %lxh\n", func, line, slot); 60 } 61 62 static long ps3_hpte_insert(unsigned long hpte_group, unsigned long va, 63 unsigned long pa, unsigned long rflags, unsigned long vflags, 64 int psize, int ssize) 65 { 66 unsigned long slot; 67 struct hash_pte lhpte; 68 int secondary = 0; 69 unsigned long result; 70 unsigned long bitmap; 71 unsigned long flags; 72 unsigned long p_pteg, s_pteg, b_index, b_mask, cb, ci; 73 74 vflags &= ~HPTE_V_SECONDARY; /* this bit is ignored */ 75 76 lhpte.v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M) | 77 vflags | HPTE_V_VALID; 78 lhpte.r = hpte_encode_r(ps3_mm_phys_to_lpar(pa), psize) | rflags; 79 80 p_pteg = hpte_group / HPTES_PER_GROUP; 81 s_pteg = ~p_pteg & htab_hash_mask; 82 83 spin_lock_irqsave(&ps3_bolttab_lock, flags); 84 85 BUG_ON(bolttab[p_pteg] == 0xff && bolttab[s_pteg] == 0xff); 86 87 bitmap = (inusetab[p_pteg] << 8) | inusetab[s_pteg]; 88 89 if (bitmap == 0xffff) { 90 /* 91 * PTEG is full. Search for victim. 92 */ 93 bitmap &= ~((bolttab[p_pteg] << 8) | bolttab[s_pteg]); 94 do { 95 ci = mftb() & 15; 96 cb = 0x8000UL >> ci; 97 } while ((cb & bitmap) == 0); 98 } else { 99 /* 100 * search free slot in hardware order 101 * [primary] 0, 2, 4, 6, 1, 3, 5, 7 102 * [secondary] 0, 2, 4, 6, 1, 3, 5, 7 103 */ 104 for (ci = 0; ci < HPTES_PER_GROUP; ci += 2) { 105 cb = 0x8000UL >> ci; 106 if ((cb & bitmap) == 0) 107 goto found; 108 } 109 for (ci = 1; ci < HPTES_PER_GROUP; ci += 2) { 110 cb = 0x8000UL >> ci; 111 if ((cb & bitmap) == 0) 112 goto found; 113 } 114 for (ci = HPTES_PER_GROUP; ci < HPTES_PER_GROUP*2; ci += 2) { 115 cb = 0x8000UL >> ci; 116 if ((cb & bitmap) == 0) 117 goto found; 118 } 119 for (ci = HPTES_PER_GROUP+1; ci < HPTES_PER_GROUP*2; ci += 2) { 120 cb = 0x8000UL >> ci; 121 if ((cb & bitmap) == 0) 122 goto found; 123 } 124 } 125 126 found: 127 if (ci < HPTES_PER_GROUP) { 128 slot = p_pteg * HPTES_PER_GROUP + ci; 129 } else { 130 slot = s_pteg * HPTES_PER_GROUP + (ci & 7); 131 /* lhpte.dw0.dw0.h = 1; */ 132 vflags |= HPTE_V_SECONDARY; 133 lhpte.v |= HPTE_V_SECONDARY; 134 } 135 136 result = lv1_write_htab_entry(0, slot, lhpte.v, lhpte.r); 137 138 if (result) { 139 debug_dump_hpte(pa, va, hpte_group, bitmap, lhpte, psize, slot); 140 BUG(); 141 } 142 143 /* 144 * If used slot is not in primary HPTE group, 145 * the slot should be in secondary HPTE group. 146 */ 147 148 if ((hpte_group ^ slot) & ~(HPTES_PER_GROUP - 1)) { 149 secondary = 1; 150 b_index = s_pteg; 151 } else { 152 secondary = 0; 153 b_index = p_pteg; 154 } 155 156 b_mask = (lhpte.v & HPTE_V_BOLTED) ? 1 << 7 : 0 << 7; 157 bolttab[b_index] |= b_mask >> (slot & 7); 158 b_mask = 1 << 7; 159 inusetab[b_index] |= b_mask >> (slot & 7); 160 spin_unlock_irqrestore(&ps3_bolttab_lock, flags); 161 162 return (slot & 7) | (secondary << 3); 163 } 164 165 static long ps3_hpte_remove(unsigned long hpte_group) 166 { 167 panic("ps3_hpte_remove() not implemented"); 168 return 0; 169 } 170 171 static long ps3_hpte_updatepp(unsigned long slot, unsigned long newpp, 172 unsigned long va, int psize, int ssize, int local) 173 { 174 unsigned long flags; 175 unsigned long result; 176 unsigned long pteg, bit; 177 unsigned long hpte_v, want_v; 178 179 want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M); 180 181 spin_lock_irqsave(&ps3_bolttab_lock, flags); 182 183 hpte_v = htab[slot].v; 184 if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) { 185 spin_unlock_irqrestore(&ps3_bolttab_lock, flags); 186 187 /* ps3_hpte_insert() will be used to update PTE */ 188 return -1; 189 } 190 191 result = lv1_write_htab_entry(0, slot, 0, 0); 192 193 if (result) { 194 DBG("%s: va=%lx slot=%lx psize=%d result = %ld (0x%lx)\n", 195 __func__, va, slot, psize, result, result); 196 BUG(); 197 } 198 199 pteg = slot / HPTES_PER_GROUP; 200 bit = slot % HPTES_PER_GROUP; 201 inusetab[pteg] &= ~(0x80 >> bit); 202 203 spin_unlock_irqrestore(&ps3_bolttab_lock, flags); 204 205 /* ps3_hpte_insert() will be used to update PTE */ 206 return -1; 207 } 208 209 static void ps3_hpte_updateboltedpp(unsigned long newpp, unsigned long ea, 210 int psize, int ssize) 211 { 212 panic("ps3_hpte_updateboltedpp() not implemented"); 213 } 214 215 static void ps3_hpte_invalidate(unsigned long slot, unsigned long va, 216 int psize, int ssize, int local) 217 { 218 unsigned long flags; 219 unsigned long result; 220 unsigned long pteg, bit; 221 222 spin_lock_irqsave(&ps3_bolttab_lock, flags); 223 result = lv1_write_htab_entry(0, slot, 0, 0); 224 225 if (result) { 226 DBG("%s: va=%lx slot=%lx psize=%d result = %ld (0x%lx)\n", 227 __func__, va, slot, psize, result, result); 228 BUG(); 229 } 230 231 pteg = slot / HPTES_PER_GROUP; 232 bit = slot % HPTES_PER_GROUP; 233 inusetab[pteg] &= ~(0x80 >> bit); 234 spin_unlock_irqrestore(&ps3_bolttab_lock, flags); 235 } 236 237 static void ps3_hpte_clear(void) 238 { 239 int result; 240 241 DBG(" -> %s:%d\n", __func__, __LINE__); 242 243 result = lv1_unmap_htab(htab_addr); 244 BUG_ON(result); 245 246 ps3_mm_shutdown(); 247 ps3_mm_vas_destroy(); 248 249 DBG(" <- %s:%d\n", __func__, __LINE__); 250 } 251 252 void __init ps3_hpte_init(unsigned long htab_size) 253 { 254 long bitmap_size; 255 256 DBG(" -> %s:%d\n", __func__, __LINE__); 257 258 ppc_md.hpte_invalidate = ps3_hpte_invalidate; 259 ppc_md.hpte_updatepp = ps3_hpte_updatepp; 260 ppc_md.hpte_updateboltedpp = ps3_hpte_updateboltedpp; 261 ppc_md.hpte_insert = ps3_hpte_insert; 262 ppc_md.hpte_remove = ps3_hpte_remove; 263 ppc_md.hpte_clear_all = ps3_hpte_clear; 264 265 ppc64_pft_size = __ilog2(htab_size); 266 267 bitmap_size = htab_size / sizeof(struct hash_pte) / 8; 268 269 bolttab = __va(lmb_alloc(bitmap_size, 1)); 270 inusetab = __va(lmb_alloc(bitmap_size, 1)); 271 272 memset(bolttab, 0, bitmap_size); 273 memset(inusetab, 0, bitmap_size); 274 275 DBG(" <- %s:%d\n", __func__, __LINE__); 276 } 277 278 void __init ps3_map_htab(void) 279 { 280 long result; 281 unsigned long htab_size = (1UL << ppc64_pft_size); 282 283 result = lv1_map_htab(0, &htab_addr); 284 285 htab = (__force struct hash_pte *)ioremap_flags(htab_addr, htab_size, 286 pgprot_val(PAGE_READONLY_X)); 287 288 DBG("%s:%d: lpar %016lxh, virt %016lxh\n", __func__, __LINE__, 289 htab_addr, (unsigned long)htab); 290 } 291