| 1 | // Buffering handling |
| 2 | // (c) Copyright 2007, Grazvydas "notaz" Ignotas |
| 3 | |
| 4 | #include "../PicoInt.h" |
| 5 | |
| 6 | int PicoCDBuffers = 0; |
| 7 | static unsigned char *cd_buffer = NULL; |
| 8 | static int prev_lba = 0x80000000; |
| 9 | |
| 10 | static int hits, reads; |
| 11 | |
| 12 | //#define THREADED_CD_IO |
| 13 | |
| 14 | /* threaded reader */ |
| 15 | #ifdef THREADED_CD_IO |
| 16 | #include <pthread.h> |
| 17 | #define tioprintf printf |
| 18 | |
| 19 | static pthread_t thr_thread = 0; |
| 20 | static pthread_cond_t thr_cond = PTHREAD_COND_INITIALIZER; |
| 21 | static pthread_mutex_t thr_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 22 | static unsigned char *thr_buffer[2][2048 + 304] __attribute__((aligned(4))); |
| 23 | static int thr_lba_need; |
| 24 | static int thr_lba_have[2]; |
| 25 | |
| 26 | static void thr_read_lba(int slot, int lba) |
| 27 | { |
| 28 | int is_bin = Pico_mcd->TOC.Tracks[0].ftype == TYPE_BIN; |
| 29 | int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11); |
| 30 | |
| 31 | pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET); |
| 32 | pm_read(thr_buffer[slot], 2048, Pico_mcd->TOC.Tracks[0].F); |
| 33 | thr_lba_have[slot] = lba; |
| 34 | } |
| 35 | |
| 36 | static void *buffering_thread(void *arg) |
| 37 | { |
| 38 | int free_slot, lba; |
| 39 | |
| 40 | elprintf(EL_STATUS, "CD I/O thread started."); |
| 41 | |
| 42 | pthread_mutex_lock(&thr_mutex); |
| 43 | |
| 44 | while (1) |
| 45 | { |
| 46 | if (thr_lba_need < 0) goto wait; |
| 47 | |
| 48 | free_slot = -1; |
| 49 | if (thr_lba_have[0] == -1) free_slot = 0; |
| 50 | if (thr_lba_have[1] == -1) free_slot = 1; |
| 51 | if (free_slot == -1) goto wait; |
| 52 | |
| 53 | lba = thr_lba_need; |
| 54 | if (lba != thr_lba_have[free_slot^1]) { |
| 55 | thr_read_lba(free_slot, lba); |
| 56 | tioprintf("t done %i %i\n", lba, free_slot); |
| 57 | continue; |
| 58 | } |
| 59 | lba++; |
| 60 | if (lba != thr_lba_have[free_slot^1]) { |
| 61 | thr_read_lba(free_slot, lba); |
| 62 | tioprintf("t done %i %i\n", lba, free_slot); |
| 63 | continue; |
| 64 | } |
| 65 | |
| 66 | wait: |
| 67 | pthread_cond_wait(&thr_cond, &thr_mutex); |
| 68 | tioprintf("t wake\n"); |
| 69 | } |
| 70 | |
| 71 | pthread_mutex_unlock(&thr_mutex); |
| 72 | |
| 73 | return NULL; |
| 74 | } |
| 75 | |
| 76 | static void threaded_read(void *dest, int lba) |
| 77 | { |
| 78 | int i, have = -1; |
| 79 | tioprintf("\n"); |
| 80 | |
| 81 | if (lba == thr_lba_have[0]) have = 0; |
| 82 | if (lba == thr_lba_have[1]) have = 1; |
| 83 | if (have != -1) |
| 84 | { |
| 85 | tioprintf("r hit %i %i\n", lba, have); |
| 86 | memcpy32(dest, (int *)thr_buffer[have], 2048/4); |
| 87 | if (lba != prev_lba) { |
| 88 | thr_lba_have[have] = -1; // make free slot |
| 89 | thr_lba_need = lba + 1; // guess a sequential read.. |
| 90 | pthread_cond_signal(&thr_cond); |
| 91 | sched_yield(); |
| 92 | prev_lba = lba; |
| 93 | } |
| 94 | return; |
| 95 | } |
| 96 | |
| 97 | tioprintf("r miss %i\n", lba); |
| 98 | thr_lba_need = lba; |
| 99 | pthread_mutex_lock(&thr_mutex); |
| 100 | pthread_mutex_unlock(&thr_mutex); |
| 101 | if (lba == thr_lba_have[0]) have = 0; |
| 102 | if (lba == thr_lba_have[1]) have = 1; |
| 103 | if (have == -1) |
| 104 | { |
| 105 | // try again.. |
| 106 | thr_lba_have[0] = thr_lba_have[1] = -1; |
| 107 | for (i = 0; have == -1 && i < 10; i++) |
| 108 | { |
| 109 | tioprintf("r hard %i\n", lba); |
| 110 | pthread_cond_signal(&thr_cond); |
| 111 | sched_yield(); |
| 112 | pthread_mutex_lock(&thr_mutex); |
| 113 | pthread_mutex_unlock(&thr_mutex); |
| 114 | if (lba == thr_lba_have[0]) have = 0; |
| 115 | if (lba == thr_lba_have[1]) have = 1; |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | // we MUST have the data at this point.. |
| 120 | if (have == -1) { tioprintf("BUG!\n"); exit(1); } |
| 121 | tioprintf("r reco %i %i\n", lba, have); |
| 122 | memcpy32(dest, (int *)thr_buffer[have], 2048/4); |
| 123 | thr_lba_have[have] = -1; |
| 124 | pthread_cond_signal(&thr_cond); |
| 125 | |
| 126 | prev_lba = lba; |
| 127 | return; |
| 128 | } |
| 129 | #endif |
| 130 | |
| 131 | |
| 132 | void PicoCDBufferInit(void) |
| 133 | { |
| 134 | void *tmp; |
| 135 | |
| 136 | prev_lba = 0x80000000; |
| 137 | hits = reads = 0; |
| 138 | cd_buffer = NULL; |
| 139 | |
| 140 | if (PicoCDBuffers <= 1) { |
| 141 | PicoCDBuffers = 0; |
| 142 | goto no_buffering; /* buffering off */ |
| 143 | } |
| 144 | |
| 145 | /* try alloc'ing until we succeed */ |
| 146 | while (PicoCDBuffers > 0) |
| 147 | { |
| 148 | tmp = realloc(cd_buffer, PicoCDBuffers * 2048 + 304); |
| 149 | if (tmp != NULL) break; |
| 150 | PicoCDBuffers >>= 1; |
| 151 | } |
| 152 | |
| 153 | if (PicoCDBuffers > 0) { |
| 154 | cd_buffer = tmp; |
| 155 | return; |
| 156 | } |
| 157 | |
| 158 | no_buffering:; |
| 159 | #ifdef THREADED_CD_IO |
| 160 | thr_lba_need = thr_lba_have[0] = thr_lba_have[1] = -1; |
| 161 | if (thr_thread == 0) |
| 162 | { |
| 163 | pthread_create(&thr_thread, NULL, buffering_thread, NULL); |
| 164 | } |
| 165 | #endif |
| 166 | } |
| 167 | |
| 168 | |
| 169 | void PicoCDBufferFree(void) |
| 170 | { |
| 171 | #ifdef THREADED_CD_IO |
| 172 | pthread_mutex_lock(&thr_mutex); |
| 173 | pthread_mutex_unlock(&thr_mutex); |
| 174 | #endif |
| 175 | if (cd_buffer) { |
| 176 | free(cd_buffer); |
| 177 | cd_buffer = NULL; |
| 178 | } |
| 179 | if (reads) |
| 180 | elprintf(EL_STATUS, "CD buffer hits: %i/%i (%i%%)\n", hits, reads, hits * 100 / reads); |
| 181 | } |
| 182 | |
| 183 | |
| 184 | /* this is a try to fight slow SD access of GP2X */ |
| 185 | PICO_INTERNAL void PicoCDBufferRead(void *dest, int lba) |
| 186 | { |
| 187 | int is_bin, offs, read_len, moved = 0; |
| 188 | reads++; |
| 189 | |
| 190 | is_bin = Pico_mcd->TOC.Tracks[0].ftype == TYPE_BIN; |
| 191 | |
| 192 | if (PicoCDBuffers <= 0) |
| 193 | { |
| 194 | #ifdef THREADED_CD_IO |
| 195 | threaded_read(dest, lba); |
| 196 | return; |
| 197 | #else |
| 198 | /* no buffering */ |
| 199 | int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11); |
| 200 | pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET); |
| 201 | pm_read(dest, 2048, Pico_mcd->TOC.Tracks[0].F); |
| 202 | return; |
| 203 | #endif |
| 204 | } |
| 205 | |
| 206 | /* hit? */ |
| 207 | offs = lba - prev_lba; |
| 208 | if (offs >= 0 && offs < PicoCDBuffers) |
| 209 | { |
| 210 | hits++; |
| 211 | if (offs == 0) dprintf("CD buffer seek to old %i -> %i\n", prev_lba, lba); |
| 212 | memcpy32(dest, (int *)(cd_buffer + offs*2048), 2048/4); |
| 213 | return; |
| 214 | } |
| 215 | |
| 216 | if (prev_lba + PicoCDBuffers != lba) |
| 217 | { |
| 218 | int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11); |
| 219 | dprintf("CD buffer seek %i -> %i\n", prev_lba, lba); |
| 220 | pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET); |
| 221 | } |
| 222 | |
| 223 | dprintf("CD buffer miss %i -> %i\n", prev_lba, lba); |
| 224 | |
| 225 | if (lba < prev_lba && prev_lba - lba < PicoCDBuffers) |
| 226 | { |
| 227 | read_len = prev_lba - lba; |
| 228 | dprintf("CD buffer move=%i, read_len=%i", PicoCDBuffers - read_len, read_len); |
| 229 | memmove(cd_buffer + read_len*2048, cd_buffer, (PicoCDBuffers - read_len)*2048); |
| 230 | moved = 1; |
| 231 | } |
| 232 | else |
| 233 | { |
| 234 | read_len = PicoCDBuffers; |
| 235 | } |
| 236 | |
| 237 | if (PicoMessage != NULL && read_len >= 512) |
| 238 | { |
| 239 | PicoMessage("Buffering data..."); |
| 240 | } |
| 241 | |
| 242 | if (is_bin) |
| 243 | { |
| 244 | int i = 0; |
| 245 | #if REDUCE_IO_CALLS |
| 246 | int bufs = (read_len*2048) / (2048+304); |
| 247 | pm_read(cd_buffer, bufs*(2048+304), Pico_mcd->TOC.Tracks[0].F); |
| 248 | for (i = 1; i < bufs; i++) |
| 249 | // should really use memmove here, but my memcpy32 implementation is also suitable here |
| 250 | memcpy32((int *)(cd_buffer + i*2048), (int *)(cd_buffer + i*(2048+304)), 2048/4); |
| 251 | #endif |
| 252 | for (; i < read_len - 1; i++) |
| 253 | { |
| 254 | pm_read(cd_buffer + i*2048, 2048 + 304, Pico_mcd->TOC.Tracks[0].F); |
| 255 | // pm_seek(Pico_mcd->TOC.Tracks[0].F, 304, SEEK_CUR); // seeking is slower, in PSP case even more |
| 256 | } |
| 257 | // further data might be moved, do not overwrite |
| 258 | pm_read(cd_buffer + i*2048, 2048, Pico_mcd->TOC.Tracks[0].F); |
| 259 | pm_seek(Pico_mcd->TOC.Tracks[0].F, 304, SEEK_CUR); |
| 260 | } |
| 261 | else |
| 262 | { |
| 263 | pm_read(cd_buffer, read_len*2048, Pico_mcd->TOC.Tracks[0].F); |
| 264 | } |
| 265 | memcpy32(dest, (int *) cd_buffer, 2048/4); |
| 266 | prev_lba = lba; |
| 267 | |
| 268 | if (moved) |
| 269 | { |
| 270 | /* file pointer must point to the same data in file, as would-be data after our buffer */ |
| 271 | int where_seek; |
| 272 | lba += PicoCDBuffers; |
| 273 | where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11); |
| 274 | pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET); |
| 275 | } |
| 276 | } |
| 277 | |