src/gallium/drivers/cell/ppu/cell_spu.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 /**
  30  * Utility/wrappers for communicating with the SPUs.
  31  */
  32
  33
  34 #include <pthread.h>
  35
  36 #include "cell_spu.h"
  37 #include "pipe/p_format.h"
  38 #include "pipe/p_state.h"
  39 #include "util/u_memory.h"
  40 #include "cell/common.h"
  41
  42
  43 /*
  44 helpful headers:
  45 /opt/ibm/cell-sdk/prototype/src/include/ppu/cbe_mfc.h
  46 */
  47
  48
  49 /**
  50  * Cell/SPU info that's not per-context.
  51  */
  52 struct cell_global_info cell_global;
  53
  54
  55 /**
  56  * Scan /proc/cpuinfo to determine the timebase for the system.
  57  * This is used by the SPUs to convert 'decrementer' ticks to seconds.
  58  * There may be a better way to get this value...
  59  */
  60 static unsigned
  61 get_timebase(void)
  62 {
  63    FILE *f = fopen("/proc/cpuinfo", "r");
  64    unsigned timebase;
  65
  66    assert(f);
  67    while (!feof(f)) {
  68       char line[80];
  69       fgets(line, sizeof(line), f);
  70       if (strncmp(line, "timebase", 8) == 0) {
  71          char *colon = strchr(line, ':');
  72          if (colon) {
  73             timebase = atoi(colon + 2);
  74             break;
  75          }
  76       }
  77    }
  78    fclose(f);
  79
  80    return timebase;
  81 }
  82
  83
  84 /**
  85  * Write a 1-word message to the given SPE mailbox.
  86  */
  87 void
  88 send_mbox_message(spe_context_ptr_t ctx, unsigned int msg)
  89 {
  90    spe_in_mbox_write(ctx, &msg, 1, SPE_MBOX_ALL_BLOCKING);
  91 }
  92
  93
  94 /**
  95  * Wait for a 1-word message to arrive in given mailbox.
  96  */
  97 uint
  98 wait_mbox_message(spe_context_ptr_t ctx)
  99 {
 100    do {
 101       unsigned data;
 102       int count = spe_out_mbox_read(ctx, &data, 1);
 103
 104       if (count == 1) {
 105          return data;
 106       }
 107
 108       if (count < 0) {
 109          /* error */ ;
 110       }
 111    } while (1);
 112 }
 113
 114
 115 /**
 116  * Called by pthread_create() to spawn an SPU thread.
 117  */
 118 static void *
 119 cell_thread_function(void *arg)
 120 {
 121    struct cell_init_info *init = (struct cell_init_info *) arg;
 122    unsigned entry = SPE_DEFAULT_ENTRY;
 123
 124    ASSERT_ALIGN16(init);
 125
 126    if (spe_context_run(cell_global.spe_contexts[init->id], &entry, 0,
 127                        init, NULL, NULL) < 0) {
 128       fprintf(stderr, "spe_context_run() failed\n");
 129       exit(1);
 130    }
 131
 132    pthread_exit(NULL);
 133 }
 134
 135
 136 /**
 137  * Create the SPU threads.  This is done once during driver initialization.
 138  * This involves setting the "init" message which is sent to each SPU.
 139  * The init message specifies an SPU id, total number of SPUs, location
 140  * and number of batch buffers, etc.
 141  */
 142 void
 143 cell_start_spus(struct cell_context *cell)
 144 {
 145    static boolean one_time_init = FALSE;
 146    uint i, j;
 147    uint timebase = get_timebase();
 148
 149    if (one_time_init) {
 150       fprintf(stderr, "PPU: Multiple rendering contexts not yet supported "
 151               "on Cell.\n");
 152       abort();
 153    }
 154
 155    one_time_init = TRUE;
 156
 157    assert(cell->num_spus <= CELL_MAX_SPUS);
 158
 159    ASSERT_ALIGN16(&cell_global.inits[0]);
 160    ASSERT_ALIGN16(&cell_global.inits[1]);
 161
 162    /*
 163     * Initialize the global 'inits' structure for each SPU.
 164     * A pointer to the init struct will be passed to each SPU.
 165     * The SPUs will then each grab their init info with mfc_get().
 166     */
 167    for (i = 0; i < cell->num_spus; i++) {
 168       cell_global.inits[i].id = i;
 169       cell_global.inits[i].num_spus = cell->num_spus;
 170       cell_global.inits[i].debug_flags = cell->debug_flags;
 171       cell_global.inits[i].inv_timebase = 1000.0f / timebase;
 172
 173       for (j = 0; j < CELL_NUM_BUFFERS; j++) {
 174          cell_global.inits[i].buffers[j] = cell->buffer[j];
 175       }
 176       cell_global.inits[i].buffer_status = &cell->buffer_status[0][0][0];
 177
 178       cell_global.inits[i].spu_functions = &cell->spu_functions;
 179
 180       cell_global.spe_contexts[i] = spe_context_create(0, NULL);
 181       if (!cell_global.spe_contexts[i]) {
 182          fprintf(stderr, "spe_context_create() failed\n");
 183          exit(1);
 184       }
 185
 186       if (spe_program_load(cell_global.spe_contexts[i], &g3d_spu)) {
 187          fprintf(stderr, "spe_program_load() failed\n");
 188          exit(1);
 189       }
 190
 191       pthread_create(&cell_global.spe_threads[i], /* returned thread handle */
 192                      NULL,                        /* pthread attribs */
 193                      &cell_thread_function,       /* start routine */
 194                      &cell_global.inits[i]);      /* thread argument */
 195    }
 196 }
 197
 198
 199 /**
 200  * Tell all the SPUs to stop/exit.
 201  * This is done when the driver's exiting / cleaning up.
 202  */
 203 void
 204 cell_spu_exit(struct cell_context *cell)
 205 {
 206    uint i;
 207
 208    for (i = 0; i < cell->num_spus; i++) {
 209       send_mbox_message(cell_global.spe_contexts[i], CELL_CMD_EXIT);
 210    }
 211
 212    /* wait for threads to exit */
 213    for (i = 0; i < cell->num_spus; i++) {
 214       void *value;
 215       pthread_join(cell_global.spe_threads[i], &value);
 216       cell_global.spe_threads[i] = 0;
 217       cell_global.spe_contexts[i] = 0;
 218    }
 219 }