/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 **************************************************************************/


#include "cell_context.h"
#include "cell_batch.h"
#include "cell_spu.h"


void
cell_batch_flush(struct cell_context *cell)
{
   static boolean flushing = FALSE;
   uint batch = cell->cur_batch;
   const uint size = cell->batch_buffer_size[batch];
   uint spu, cmd_word;

   assert(!flushing);

   if (size == 0)
      return;

   flushing = TRUE;

   assert(batch < CELL_NUM_BATCH_BUFFERS);

   /*
   printf("cell_batch_dispatch: buf %u at %p, size %u\n",
          batch, &cell->batch_buffer[batch][0], size);
   */
     
   /*
    * Build "BATCH" command and sent to all SPUs.
    */
   cmd_word = CELL_CMD_BATCH | (batch << 8) | (size << 16);

   for (spu = 0; spu < cell->num_spus; spu++) {
      assert(cell->buffer_status[spu][batch][0] == CELL_BUFFER_STATUS_USED);
      send_mbox_message(cell_global.spe_contexts[spu], cmd_word);
   }

   /* When the SPUs are done copying the buffer into their locals stores
    * they'll write a BUFFER_STATUS_FREE message into the buffer_status[]
    * array indicating that the PPU can re-use the buffer.
    */


   /* Find a buffer that's marked as free by all SPUs */
   while (1) {
      uint num_free = 0;

      batch = (batch + 1) % CELL_NUM_BATCH_BUFFERS;

      for (spu = 0; spu < cell->num_spus; spu++) {
         if (cell->buffer_status[spu][batch][0] == CELL_BUFFER_STATUS_FREE)
            num_free++;
      }

      if (num_free == cell->num_spus) {
         /* found a free buffer, now mark status as used */
         for (spu = 0; spu < cell->num_spus; spu++) {
            cell->buffer_status[spu][batch][0] = CELL_BUFFER_STATUS_USED;
         }
         break;
      }
   }

   cell->batch_buffer_size[batch] = 0;  /* empty */
   cell->cur_batch = batch;

   flushing = FALSE;
}


/**
 * \param cmd  command to append
 * \param length  command size in bytes
 */
void
cell_batch_append(struct cell_context *cell, const void *cmd, uint length)
{
   uint size;

   assert(length % 4 == 0);
   assert(cell->cur_batch >= 0);

   size = cell->batch_buffer_size[cell->cur_batch];

   if (size + length > CELL_BATCH_BUFFER_SIZE) {
      cell_batch_flush(cell);
      size = 0;
   }

   assert(size + length <= CELL_BATCH_BUFFER_SIZE);

   memcpy(cell->batch_buffer[cell->cur_batch] + size, cmd, length);

   cell->batch_buffer_size[cell->cur_batch] = size + length;
}


void *
cell_batch_alloc(struct cell_context *cell, uint bytes)
{
   void *pos;
   uint size;

   assert(cell->cur_batch >= 0);

   size = cell->batch_buffer_size[cell->cur_batch];

   if (size + bytes > CELL_BATCH_BUFFER_SIZE) {
      cell_batch_flush(cell);
      size = 0;
   }

   assert(size + bytes <= CELL_BATCH_BUFFER_SIZE);

   pos = (void *) (cell->batch_buffer[cell->cur_batch] + size);

   cell->batch_buffer_size[cell->cur_batch] = size + bytes;

   return pos;
}