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1 | // Buffering handling |
2 | // (c) Copyright 2007, Grazvydas "notaz" Ignotas |
3 | |
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4 | #include "../PicoInt.h" |
5 | |
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6 | int PicoCDBuffers = 0; |
7 | static unsigned char *cd_buffer = NULL; |
8 | static int prev_lba = 0x80000000; |
9 | |
10 | static int hits, reads; |
11 | |
da310283 |
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 | |
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131 | |
132 | void PicoCDBufferInit(void) |
133 | { |
134 | void *tmp; |
135 | |
136 | prev_lba = 0x80000000; |
137 | hits = reads = 0; |
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138 | cd_buffer = NULL; |
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139 | |
140 | if (PicoCDBuffers <= 1) { |
141 | PicoCDBuffers = 0; |
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142 | goto no_buffering; /* buffering off */ |
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143 | } |
144 | |
145 | /* try alloc'ing until we succeed */ |
146 | while (PicoCDBuffers > 0) |
147 | { |
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148 | tmp = realloc(cd_buffer, PicoCDBuffers * 2048 + 304); |
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149 | if (tmp != NULL) break; |
150 | PicoCDBuffers >>= 1; |
151 | } |
152 | |
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153 | if (PicoCDBuffers > 0) { |
154 | cd_buffer = tmp; |
155 | return; |
156 | } |
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157 | |
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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 |
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166 | } |
167 | |
168 | |
169 | void PicoCDBufferFree(void) |
170 | { |
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171 | #ifdef THREADED_CD_IO |
172 | pthread_mutex_lock(&thr_mutex); |
173 | pthread_mutex_unlock(&thr_mutex); |
174 | #endif |
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175 | if (cd_buffer) { |
176 | free(cd_buffer); |
177 | cd_buffer = NULL; |
178 | } |
179 | if (reads) |
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180 | elprintf(EL_STATUS, "CD buffer hits: %i/%i (%i%%)\n", hits, reads, hits * 100 / reads); |
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181 | } |
182 | |
183 | |
184 | /* this is a try to fight slow SD access of GP2X */ |
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185 | PICO_INTERNAL void PicoCDBufferRead(void *dest, int lba) |
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186 | { |
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187 | int is_bin, offs, read_len, moved = 0; |
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188 | reads++; |
189 | |
190 | is_bin = Pico_mcd->TOC.Tracks[0].ftype == TYPE_BIN; |
191 | |
192 | if (PicoCDBuffers <= 0) |
193 | { |
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194 | #ifdef THREADED_CD_IO |
195 | threaded_read(dest, lba); |
196 | return; |
197 | #else |
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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; |
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203 | #endif |
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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 | { |
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227 | read_len = prev_lba - lba; |
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228 | dprintf("CD buffer move=%i, read_len=%i", PicoCDBuffers - read_len, read_len); |
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229 | memmove(cd_buffer + read_len*2048, cd_buffer, (PicoCDBuffers - read_len)*2048); |
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230 | moved = 1; |
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231 | } |
232 | else |
233 | { |
234 | read_len = PicoCDBuffers; |
235 | } |
236 | |
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237 | if (PicoMessage != NULL && read_len >= 512) |
238 | { |
239 | PicoMessage("Buffering data..."); |
240 | } |
241 | |
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242 | if (is_bin) |
243 | { |
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244 | int i = 0; |
245 | #if REDUCE_IO_CALLS |
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246 | int bufs = (read_len*2048) / (2048+304); |
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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 |
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252 | for (; i < read_len - 1; i++) |
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253 | { |
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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 |
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256 | } |
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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); |
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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; |
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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 | } |
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276 | } |
277 | |