src/mesa/drivers/dri/intel/intel_batchbuffer.c

/**************************************************************************
 * 
 * Copyright 2006 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 "intel_context.h"
#include "intel_batchbuffer.h"
#include "intel_decode.h"
#include "intel_reg.h"
#include "intel_bufmgr.h"
#include "intel_buffers.h"

/* Relocations in kernel space:
 *    - pass dma buffer seperately
 *    - memory manager knows how to patch
 *    - pass list of dependent buffers
 *    - pass relocation list
 *
 * Either:
 *    - get back an offset for buffer to fire
 *    - memory manager knows how to fire buffer
 *
 * Really want the buffer to be AGP and pinned.
 *
 */

/* Cliprect fence: The highest fence protecting a dma buffer
 * containing explicit cliprect information.  Like the old drawable
 * lock but irq-driven.  X server must wait for this fence to expire
 * before changing cliprects [and then doing sw rendering?].  For
 * other dma buffers, the scheduler will grab current cliprect info
 * and mix into buffer.  X server must hold the lock while changing
 * cliprects???  Make per-drawable.  Need cliprects in shared memory
 * -- beats storing them with every cmd buffer in the queue.
 *
 * ==> X server must wait for this fence to expire before touching the
 * framebuffer with new cliprects.
 *
 * ==> Cliprect-dependent buffers associated with a
 * cliprect-timestamp.  All of the buffers associated with a timestamp
 * must go to hardware before any buffer with a newer timestamp.
 *
 * ==> Dma should be queued per-drawable for correct X/GL
 * synchronization.  Or can fences be used for this?
 *
 * Applies to: Blit operations, metaops, X server operations -- X
 * server automatically waits on its own dma to complete before
 * modifying cliprects ???
 */

void
intel_batchbuffer_reset(struct intel_batchbuffer *batch)
{
   struct intel_context *intel = batch->intel;

   if (batch->buf != NULL) {
      dri_bo_unreference(batch->buf);
      batch->buf = NULL;
   }

   if (!batch->buffer && intel->ttm == GL_TRUE)
      batch->buffer = malloc (intel->maxBatchSize);

   batch->buf = dri_bo_alloc(intel->bufmgr, "batchbuffer",
			     intel->maxBatchSize, 4096);
   if (batch->buffer)
      batch->map = batch->buffer;
   else {
      dri_bo_map(batch->buf, GL_TRUE);
      batch->map = batch->buf->virtual;
   }
   batch->size = intel->maxBatchSize;
   batch->ptr = batch->map;
   batch->dirty_state = ~0;
   batch->cliprect_mode = IGNORE_CLIPRECTS;
}

struct intel_batchbuffer *
intel_batchbuffer_alloc(struct intel_context *intel)
{
   struct intel_batchbuffer *batch = calloc(sizeof(*batch), 1);

   batch->intel = intel;
   intel_batchbuffer_reset(batch);

   return batch;
}

void
intel_batchbuffer_free(struct intel_batchbuffer *batch)
{
   if (batch->buffer)
      free (batch->buffer);
   else {
      if (batch->map) {
	 dri_bo_unmap(batch->buf);
	 batch->map = NULL;
      }
   }
   dri_bo_unreference(batch->buf);
   batch->buf = NULL;
   free(batch);
}



/* TODO: Push this whole function into bufmgr.
 */
static void
do_flush_locked(struct intel_batchbuffer *batch,
		GLuint used, GLboolean allow_unlock)
{
   struct intel_context *intel = batch->intel;
   int ret = 0;
   unsigned int num_cliprects = 0;
   struct drm_clip_rect *cliprects = NULL;
   int x_off = 0, y_off = 0;

   if (batch->buffer)
      dri_bo_subdata (batch->buf, 0, used, batch->buffer);
   else
      dri_bo_unmap(batch->buf);

   batch->map = NULL;
   batch->ptr = NULL;


   if (batch->cliprect_mode == LOOP_CLIPRECTS) {
      intel_get_cliprects(intel, &cliprects, &num_cliprects, &x_off, &y_off);
   }
   /* Dispatch the batchbuffer, if it has some effect (nonzero cliprects).
    * Can't short-circuit like this once we have hardware contexts, but we
    * should always be in DRI2 mode by then anyway.
    */
   if ((batch->cliprect_mode != LOOP_CLIPRECTS ||
	num_cliprects != 0) && !intel->no_hw) {
      dri_bo_exec(batch->buf, used, cliprects, num_cliprects,
		  (x_off & 0xffff) | (y_off << 16));
   }

   if (batch->cliprect_mode == LOOP_CLIPRECTS && num_cliprects == 0) {
      if (allow_unlock) {
	 /* If we are not doing any actual user-visible rendering,
	  * do a sched_yield to keep the app from pegging the cpu while
	  * achieving nothing.
	  */
         UNLOCK_HARDWARE(intel);
         sched_yield();
         LOCK_HARDWARE(intel);
      }
   }

   if (INTEL_DEBUG & DEBUG_BATCH) {
      dri_bo_map(batch->buf, GL_FALSE);
      intel_decode(batch->buf->virtual, used / 4, batch->buf->offset,
		   intel->intelScreen->deviceID);
      dri_bo_unmap(batch->buf);

      if (intel->vtbl.debug_batch != NULL)
	 intel->vtbl.debug_batch(intel);
   }

   if (ret != 0) {
      UNLOCK_HARDWARE(intel);
      exit(1);
   }
   intel->vtbl.new_batch(intel);
}

void
_intel_batchbuffer_flush(struct intel_batchbuffer *batch, const char *file,
			 int line)
{
   struct intel_context *intel = batch->intel;
   GLuint used = batch->ptr - batch->map;

   if (intel->first_post_swapbuffers_batch == NULL) {
      intel->first_post_swapbuffers_batch = intel->batch->buf;
      drm_intel_bo_reference(intel->first_post_swapbuffers_batch);
   }

   if (used == 0) {
      batch->cliprect_mode = IGNORE_CLIPRECTS;
      return;
   }

   if (INTEL_DEBUG & DEBUG_BATCH)
      fprintf(stderr, "%s:%d: Batchbuffer flush with %db used\n", file, line,
	      used);

   /* Emit a flush if the bufmgr doesn't do it for us. */
   if (intel->always_flush_cache || !intel->ttm) {
      *(GLuint *) (batch->ptr) = intel->vtbl.flush_cmd();
      batch->ptr += 4;
      used = batch->ptr - batch->map;
   }

   /* Round batchbuffer usage to 2 DWORDs. */

   if ((used & 4) == 0) {
      *(GLuint *) (batch->ptr) = 0; /* noop */
      batch->ptr += 4;
      used = batch->ptr - batch->map;
   }

   /* Mark the end of the buffer. */
   *(GLuint *) (batch->ptr) = MI_BATCH_BUFFER_END; /* noop */
   batch->ptr += 4;
   used = batch->ptr - batch->map;

   /* Workaround for recursive batchbuffer flushing: If the window is
    * moved, we can get into a case where we try to flush during a
    * flush.  What happens is that when we try to grab the lock for
    * the first flush, we detect that the window moved which then
    * causes another flush (from the intel_draw_buffer() call in
    * intelUpdatePageFlipping()).  To work around this we reset the
    * batchbuffer tail pointer before trying to get the lock.  This
    * prevent the nested buffer flush, but a better fix would be to
    * avoid that in the first place. */
   batch->ptr = batch->map;

   if (intel->vtbl.finish_batch)
      intel->vtbl.finish_batch(intel);

   /* TODO: Just pass the relocation list and dma buffer up to the
    * kernel.
    */
   LOCK_HARDWARE(intel);
   do_flush_locked(batch, used, GL_FALSE);
   UNLOCK_HARDWARE(intel);

   if (INTEL_DEBUG & DEBUG_SYNC) {
      fprintf(stderr, "waiting for idle\n");
      dri_bo_map(batch->buf, GL_TRUE);
      dri_bo_unmap(batch->buf);
   }

   /* Reset the buffer:
    */
   intel_batchbuffer_reset(batch);
}


/*  This is the only way buffers get added to the validate list.
 */
GLboolean
intel_batchbuffer_emit_reloc(struct intel_batchbuffer *batch,
                             dri_bo *buffer,
                             uint32_t read_domains, uint32_t write_domain,
			     uint32_t delta)
{
   int ret;

   if (batch->ptr - batch->map > batch->buf->size)
    _mesa_printf ("bad relocation ptr %p map %p offset %d size %d\n",
		  batch->ptr, batch->map, batch->ptr - batch->map, batch->buf->size);
   ret = dri_bo_emit_reloc(batch->buf, read_domains, write_domain,
			   delta, batch->ptr - batch->map, buffer);

   /*
    * Using the old buffer offset, write in what the right data would be, in case
    * the buffer doesn't move and we can short-circuit the relocation processing
    * in the kernel
    */
   intel_batchbuffer_emit_dword (batch, buffer->offset + delta);

   return GL_TRUE;
}

void
intel_batchbuffer_data(struct intel_batchbuffer *batch,
                       const void *data, GLuint bytes,
		       enum cliprect_mode cliprect_mode)
{
   assert((bytes & 3) == 0);
   intel_batchbuffer_require_space(batch, bytes, cliprect_mode);
   __memcpy(batch->ptr, data, bytes);
   batch->ptr += bytes;
}