arch/powerpc/platforms/ps3/htab.c

   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, int psize)
  64 {
  65         unsigned long slot;
  66         struct hash_pte lhpte;
  67         int secondary = 0;
  68         unsigned long result;
  69         unsigned long bitmap;
  70         unsigned long flags;
  71         unsigned long p_pteg, s_pteg, b_index, b_mask, cb, ci;
  72
  73         vflags &= ~HPTE_V_SECONDARY; /* this bit is ignored */
  74
  75         lhpte.v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
  76         lhpte.r = hpte_encode_r(ps3_mm_phys_to_lpar(pa), psize) | rflags;
  77
  78         p_pteg = hpte_group / HPTES_PER_GROUP;
  79         s_pteg = ~p_pteg & htab_hash_mask;
  80
  81         spin_lock_irqsave(&ps3_bolttab_lock, flags);
  82
  83         BUG_ON(bolttab[p_pteg] == 0xff && bolttab[s_pteg] == 0xff);
  84
  85         bitmap = (inusetab[p_pteg] << 8) | inusetab[s_pteg];
  86
  87         if (bitmap == 0xffff) {
  88                 /*
  89                  * PTEG is full. Search for victim.
  90                  */
  91                 bitmap &= ~((bolttab[p_pteg] << 8) | bolttab[s_pteg]);
  92                 do {
  93                         ci = mftb() & 15;
  94                         cb = 0x8000UL >> ci;
  95                 } while ((cb & bitmap) == 0);
  96         } else {
  97                 /*
  98                  * search free slot in hardware order
  99                  *      [primary]       0, 2, 4, 6, 1, 3, 5, 7
 100                  *      [secondary]     0, 2, 4, 6, 1, 3, 5, 7
 101                  */
 102                 for (ci = 0; ci < HPTES_PER_GROUP; ci += 2) {
 103                         cb = 0x8000UL >> ci;
 104                         if ((cb & bitmap) == 0)
 105                                 goto found;
 106                 }
 107                 for (ci = 1; ci < HPTES_PER_GROUP; ci += 2) {
 108                         cb = 0x8000UL >> ci;
 109                         if ((cb & bitmap) == 0)
 110                                 goto found;
 111                 }
 112                 for (ci = HPTES_PER_GROUP; ci < HPTES_PER_GROUP*2; ci += 2) {
 113                         cb = 0x8000UL >> ci;
 114                         if ((cb & bitmap) == 0)
 115                                 goto found;
 116                 }
 117                 for (ci = HPTES_PER_GROUP+1; ci < HPTES_PER_GROUP*2; ci += 2) {
 118                         cb = 0x8000UL >> ci;
 119                         if ((cb & bitmap) == 0)
 120                                 goto found;
 121                 }
 122         }
 123
 124 found:
 125         if (ci < HPTES_PER_GROUP) {
 126                 slot = p_pteg * HPTES_PER_GROUP + ci;
 127         } else {
 128                 slot = s_pteg * HPTES_PER_GROUP + (ci & 7);
 129                 /* lhpte.dw0.dw0.h = 1; */
 130                 vflags |= HPTE_V_SECONDARY;
 131                 lhpte.v |= HPTE_V_SECONDARY;
 132         }
 133
 134         result = lv1_write_htab_entry(0, slot, lhpte.v, lhpte.r);
 135
 136         if (result) {
 137                 debug_dump_hpte(pa, va, hpte_group, bitmap, lhpte, psize, slot);
 138                 BUG();
 139         }
 140
 141         /*
 142          * If used slot is not in primary HPTE group,
 143          * the slot should be in secondary HPTE group.
 144          */
 145
 146         if ((hpte_group ^ slot) & ~(HPTES_PER_GROUP - 1)) {
 147                 secondary = 1;
 148                 b_index = s_pteg;
 149         } else {
 150                 secondary = 0;
 151                 b_index = p_pteg;
 152         }
 153
 154         b_mask = (lhpte.v & HPTE_V_BOLTED) ? 1 << 7 : 0 << 7;
 155         bolttab[b_index] |= b_mask >> (slot & 7);
 156         b_mask = 1 << 7;
 157         inusetab[b_index] |= b_mask >> (slot & 7);
 158         spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
 159
 160         return (slot & 7) | (secondary << 3);
 161 }
 162
 163 static long ps3_hpte_remove(unsigned long hpte_group)
 164 {
 165         panic("ps3_hpte_remove() not implemented");
 166         return 0;
 167 }
 168
 169 static long ps3_hpte_updatepp(unsigned long slot, unsigned long newpp,
 170         unsigned long va, int psize, int local)
 171 {
 172         unsigned long flags;
 173         unsigned long result;
 174         unsigned long pteg, bit;
 175         unsigned long hpte_v, want_v;
 176
 177         want_v = hpte_encode_v(va, psize);
 178
 179         spin_lock_irqsave(&ps3_bolttab_lock, flags);
 180
 181         hpte_v = htab[slot].v;
 182         if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) {
 183                 spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
 184
 185                 /* ps3_hpte_insert() will be used to update PTE */
 186                 return -1;
 187         }
 188
 189         result = lv1_write_htab_entry(0, slot, 0, 0);
 190
 191         if (result) {
 192                 DBG("%s: va=%lx slot=%lx psize=%d result = %ld (0x%lx)\n",
 193                        __func__, va, slot, psize, result, result);
 194                 BUG();
 195         }
 196
 197         pteg = slot / HPTES_PER_GROUP;
 198         bit = slot % HPTES_PER_GROUP;
 199         inusetab[pteg] &= ~(0x80 >> bit);
 200
 201         spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
 202
 203         /* ps3_hpte_insert() will be used to update PTE */
 204         return -1;
 205 }
 206
 207 static void ps3_hpte_updateboltedpp(unsigned long newpp, unsigned long ea,
 208         int psize)
 209 {
 210         panic("ps3_hpte_updateboltedpp() not implemented");
 211 }
 212
 213 static void ps3_hpte_invalidate(unsigned long slot, unsigned long va,
 214         int psize, int local)
 215 {
 216         unsigned long flags;
 217         unsigned long result;
 218         unsigned long pteg, bit;
 219
 220         spin_lock_irqsave(&ps3_bolttab_lock, flags);
 221         result = lv1_write_htab_entry(0, slot, 0, 0);
 222
 223         if (result) {
 224                 DBG("%s: va=%lx slot=%lx psize=%d result = %ld (0x%lx)\n",
 225                        __func__, va, slot, psize, result, result);
 226                 BUG();
 227         }
 228
 229         pteg = slot / HPTES_PER_GROUP;
 230         bit = slot % HPTES_PER_GROUP;
 231         inusetab[pteg] &= ~(0x80 >> bit);
 232         spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
 233 }
 234
 235 static void ps3_hpte_clear(void)
 236 {
 237         int result;
 238
 239         DBG(" -> %s:%d\n", __func__, __LINE__);
 240
 241         result = lv1_unmap_htab(htab_addr);
 242         BUG_ON(result);
 243
 244         ps3_mm_shutdown();
 245         ps3_mm_vas_destroy();
 246
 247         DBG(" <- %s:%d\n", __func__, __LINE__);
 248 }
 249
 250 void __init ps3_hpte_init(unsigned long htab_size)
 251 {
 252         long bitmap_size;
 253
 254         DBG(" -> %s:%d\n", __func__, __LINE__);
 255
 256         ppc_md.hpte_invalidate = ps3_hpte_invalidate;
 257         ppc_md.hpte_updatepp = ps3_hpte_updatepp;
 258         ppc_md.hpte_updateboltedpp = ps3_hpte_updateboltedpp;
 259         ppc_md.hpte_insert = ps3_hpte_insert;
 260         ppc_md.hpte_remove = ps3_hpte_remove;
 261         ppc_md.hpte_clear_all = ps3_hpte_clear;
 262
 263         ppc64_pft_size = __ilog2(htab_size);
 264
 265         bitmap_size = htab_size / sizeof(struct hash_pte) / 8;
 266
 267         bolttab = __va(lmb_alloc(bitmap_size, 1));
 268         inusetab = __va(lmb_alloc(bitmap_size, 1));
 269
 270         memset(bolttab, 0, bitmap_size);
 271         memset(inusetab, 0, bitmap_size);
 272
 273         DBG(" <- %s:%d\n", __func__, __LINE__);
 274 }
 275
 276 void __init ps3_map_htab(void)
 277 {
 278         long result;
 279         unsigned long htab_size = (1UL << ppc64_pft_size);
 280
 281         result = lv1_map_htab(0, &htab_addr);
 282
 283         htab = (__force struct hash_pte *)ioremap_flags(htab_addr, htab_size,
 284                                             pgprot_val(PAGE_READONLY_X));
 285
 286         DBG("%s:%d: lpar %016lxh, virt %016lxh\n", __func__, __LINE__,
 287                 htab_addr, (unsigned long)htab);
 288 }