Mesa (master): r200: make use of DMA buffers for Elts a lot better.

[Dave Airlie]

Module: Mesa
Branch: master
Commit: 0952645fe04a27968565ea4d913500c23b1b11e3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0952645fe04a27968565ea4d913500c23b1b11e3

Author: Dave Airlie <airlied at redhat.com>
Date:   Fri Jun 26 15:05:02 2009 +1000

r200: make use of DMA buffers for Elts a lot better.

This allows us to return the unused portion of the dma buffer
to the allocator instead of wasting nearly 16k a pop.

---

 src/mesa/drivers/dri/r200/r200_cmdbuf.c  |   15 +++++----------
 src/mesa/drivers/dri/radeon/radeon_dma.c |   19 +++++++++++++------
 src/mesa/drivers/dri/radeon/radeon_dma.h |    1 +
 3 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/src/mesa/drivers/dri/r200/r200_cmdbuf.c b/src/mesa/drivers/dri/r200/r200_cmdbuf.c
index df9dd83..fe173b6 100644
--- a/src/mesa/drivers/dri/r200/r200_cmdbuf.c
+++ b/src/mesa/drivers/dri/r200/r200_cmdbuf.c
@@ -213,6 +213,9 @@ void r200FlushElts(GLcontext *ctx)
    radeon_bo_unref(rmesa->radeon.tcl.elt_dma_bo);
    rmesa->radeon.tcl.elt_dma_bo = NULL;
 
+   if (R200_ELT_BUF_SZ > elt_used)
+     radeonReturnDmaRegion(rmesa, R200_ELT_BUF_SZ - elt_used);
+
    if (R200_DEBUG & DEBUG_SYNC) {
       fprintf(stderr, "%s: Syncing\n", __FUNCTION__);
       radeonFinish( rmesa->radeon.glCtx );
@@ -233,21 +236,13 @@ GLushort *r200AllocEltsOpenEnded( r200ContextPtr rmesa,
    
    radeonEmitState(&rmesa->radeon);
 
-   rmesa->radeon.tcl.elt_dma_bo = radeon_bo_open(rmesa->radeon.radeonScreen->bom,
-					  0, R200_ELT_BUF_SZ, 4,
-					  RADEON_GEM_DOMAIN_GTT, 0);
-   rmesa->radeon.tcl.elt_dma_offset = 0;
+   radeonAllocDmaRegion(&rmesa->radeon, &rmesa->radeon.tcl.elt_dma_bo,
+			&rmesa->radeon.tcl.elt_dma_offset, R200_ELT_BUF_SZ, 4);
    rmesa->tcl.elt_used = min_nr * 2;
 
-   radeon_validate_bo(&rmesa->radeon, rmesa->radeon.tcl.elt_dma_bo,
-                      RADEON_GEM_DOMAIN_GTT, 0);
-   if (radeon_revalidate_bos(rmesa->radeon.glCtx) == GL_FALSE)
-      fprintf(stderr,"failure to revalidate BOs - badness\n");
-
    radeon_bo_map(rmesa->radeon.tcl.elt_dma_bo, 1);
    retval = rmesa->radeon.tcl.elt_dma_bo->ptr + rmesa->radeon.tcl.elt_dma_offset;
    
-
    if (R200_DEBUG & DEBUG_PRIMS)
       fprintf(stderr, "%s: header prim %x \n",
 	      __FUNCTION__, primitive);
diff --git a/src/mesa/drivers/dri/radeon/radeon_dma.c b/src/mesa/drivers/dri/radeon/radeon_dma.c
index 48b0d63..0b91434 100644
--- a/src/mesa/drivers/dri/radeon/radeon_dma.c
+++ b/src/mesa/drivers/dri/radeon/radeon_dma.c
@@ -167,7 +167,7 @@ void radeonRefillCurrentDmaRegion(radeonContextPtr rmesa, int size)
 	size = MAX2(size, MAX_DMA_BUF_SZ);
 
 	if (RADEON_DEBUG & (DEBUG_IOCTL | DEBUG_DMA))
-		fprintf(stderr, "%s\n", __FUNCTION__);
+		fprintf(stderr, "%s %d\n", __FUNCTION__, rmesa->dma.nr_released_bufs);
 
 	if (rmesa->dma.flush) {
 		rmesa->dma.flush(rmesa->glCtx);
@@ -178,11 +178,7 @@ void radeonRefillCurrentDmaRegion(radeonContextPtr rmesa, int size)
 		rmesa->dma.nr_released_bufs = 0;
 	}
 
-	if (rmesa->dma.current) {
-		radeon_bo_unmap(rmesa->dma.current);
-		radeon_bo_unref(rmesa->dma.current);
-		rmesa->dma.current = 0;
-	}
+	radeonReleaseDmaRegion(rmesa);
 
 again_alloc:	
 	rmesa->dma.current = radeon_bo_open(rmesa->radeonScreen->bom,
@@ -244,6 +240,17 @@ void radeonAllocDmaRegion(radeonContextPtr rmesa,
 	assert(rmesa->dma.current_used <= rmesa->dma.current->size);
 }
 
+void radeonReturnDmaRegion(radeonContextPtr rmesa, int return_bytes)
+{
+	if (!rmesa->dma.current)
+		return;
+
+	if (RADEON_DEBUG & DEBUG_IOCTL)
+		fprintf(stderr, "%s %d\n", __FUNCTION__, return_bytes);
+	rmesa->dma.current_used -= return_bytes;
+	rmesa->dma.current_vertexptr = rmesa->dma.current_used;
+}
+
 void radeonReleaseDmaRegion(radeonContextPtr rmesa)
 {
 	if (RADEON_DEBUG & DEBUG_IOCTL)
diff --git a/src/mesa/drivers/dri/radeon/radeon_dma.h b/src/mesa/drivers/dri/radeon/radeon_dma.h
index 06e388f..c6eabd3 100644
--- a/src/mesa/drivers/dri/radeon/radeon_dma.h
+++ b/src/mesa/drivers/dri/radeon/radeon_dma.h
@@ -39,6 +39,7 @@ void radeonEmitVec12(uint32_t *out, GLvoid * data, int stride, int count);
 void rcommon_emit_vector(GLcontext * ctx, struct radeon_aos *aos,
 			 GLvoid * data, int size, int stride, int count);
 
+void radeonReturnDmaRegion(radeonContextPtr rmesa, int return_bytes);
 void radeonRefillCurrentDmaRegion(radeonContextPtr rmesa, int size);
 void radeonAllocDmaRegion(radeonContextPtr rmesa,
 			  struct radeon_bo **pbo, int *poffset,