[Mesa-dev] [PATCH v2 1/2] i965: Cleanup MapRangeBuffer
Ben Widawsky
ben at bwidawsk.net
Fri Sep 30 20:59:39 PDT 2011
Clean the code up, and always use a BO when creating a new buffer. I've
not seen any regressions but haven't yet tried this on < Gen6.
Cc: Chad Versace <chad at chad-versace.us>
Cc: Eric Anholt <eric at anholt.net>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
src/mesa/drivers/dri/intel/intel_buffer_objects.c | 104 +++++++++------------
src/mesa/drivers/dri/intel/intel_buffer_objects.h | 4 +-
2 files changed, 44 insertions(+), 64 deletions(-)
diff --git a/src/mesa/drivers/dri/intel/intel_buffer_objects.c b/src/mesa/drivers/dri/intel/intel_buffer_objects.c
index c52afbd..fdbffe3 100644
--- a/src/mesa/drivers/dri/intel/intel_buffer_objects.c
+++ b/src/mesa/drivers/dri/intel/intel_buffer_objects.c
@@ -314,6 +314,9 @@ intel_bufferobj_map_range(struct gl_context * ctx,
intel_obj->sys_buffer = NULL;
}
+ if (intel_obj->buffer == NULL)
+ goto error_out;
+
/* If the mapping is synchronized with other GL operations, flush
* the batchbuffer so that GEM knows about the buffer access for later
* syncing.
@@ -322,11 +325,6 @@ intel_bufferobj_map_range(struct gl_context * ctx,
drm_intel_bo_references(intel->batch.bo, intel_obj->buffer))
intel_flush(ctx);
- if (intel_obj->buffer == NULL) {
- obj->Pointer = NULL;
- return NULL;
- }
-
/* If the user doesn't care about existing buffer contents and mapping
* would cause us to block, then throw out the old buffer.
*/
@@ -344,36 +342,30 @@ intel_bufferobj_map_range(struct gl_context * ctx,
*/
if ((access & GL_MAP_INVALIDATE_RANGE_BIT) &&
drm_intel_bo_busy(intel_obj->buffer)) {
- if (access & GL_MAP_FLUSH_EXPLICIT_BIT) {
- intel_obj->range_map_buffer = malloc(length);
- obj->Pointer = intel_obj->range_map_buffer;
- } else {
- intel_obj->range_map_bo = drm_intel_bo_alloc(intel->bufmgr,
- "range map",
- length, 64);
- if (!(access & GL_MAP_READ_BIT)) {
- drm_intel_gem_bo_map_gtt(intel_obj->range_map_bo);
- intel_obj->mapped_gtt = GL_TRUE;
- } else {
- drm_intel_bo_map(intel_obj->range_map_bo,
- (access & GL_MAP_WRITE_BIT) != 0);
- intel_obj->mapped_gtt = GL_FALSE;
- }
- obj->Pointer = intel_obj->range_map_bo->virtual;
- }
- return obj->Pointer;
- }
-
- if (!(access & GL_MAP_READ_BIT)) {
+ intel_obj->range_map_bo = drm_intel_bo_alloc(intel->bufmgr,
+ "range map",
+ length, 64);
+ drm_intel_gem_bo_map_gtt(intel_obj->range_map_bo);
+ intel_obj->mapped_gtt = true;
+ obj->Pointer = intel_obj->range_map_bo->virtual;
+ } else if (!(access & GL_MAP_READ_BIT)) { /* Write only */
drm_intel_gem_bo_map_gtt(intel_obj->buffer);
- intel_obj->mapped_gtt = GL_TRUE;
- } else {
+ intel_obj->mapped_gtt = true;
+ obj->Pointer = intel_obj->buffer->virtual + offset;
+ } else { /* R/W or RO */
drm_intel_bo_map(intel_obj->buffer, (access & GL_MAP_WRITE_BIT) != 0);
- intel_obj->mapped_gtt = GL_FALSE;
+ intel_obj->mapped_gtt = false;
+ obj->Pointer = intel_obj->buffer->virtual + offset;
}
- obj->Pointer = intel_obj->buffer->virtual + offset;
+ if (!(access & GL_MAP_FLUSH_EXPLICIT_BIT))
+ intel_obj->needs_flush_at_unmap = true;
+
return obj->Pointer;
+
+error_out:
+ obj->Pointer = NULL;
+ return NULL;
}
/* Ideally we'd use a BO to avoid taking up cache space for the temporary
@@ -388,27 +380,23 @@ intel_bufferobj_flush_mapped_range(struct gl_context *ctx,
{
struct intel_context *intel = intel_context(ctx);
struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
- drm_intel_bo *temp_bo;
- /* Unless we're in the range map using a temporary system buffer,
- * there's no work to do.
- */
- if (intel_obj->range_map_buffer == NULL)
- return;
+ if (intel_obj->needs_flush_at_unmap)
+ return 0;
if (length == 0)
return;
- temp_bo = drm_intel_bo_alloc(intel->bufmgr, "range map flush", length, 64);
-
- drm_intel_bo_subdata(temp_bo, 0, length, intel_obj->range_map_buffer);
-
- intel_emit_linear_blit(intel,
- intel_obj->buffer, obj->Offset + offset,
- temp_bo, 0,
- length);
+ if (!intel_obj->range_map_bo) {
+ intel_batchbuffer_emit_mi_flush(intel);
+ } else {
+ intel_emit_linear_blit(intel,
+ intel_obj->buffer, obj->Offset + offset,
+ intel_obj->range_map_bo, 0,
+ length);
- drm_intel_bo_unreference(temp_bo);
+ drm_intel_bo_unreference(intel_obj->range_map_bo);
+ }
}
@@ -425,15 +413,6 @@ intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj)
assert(obj->Pointer);
if (intel_obj->sys_buffer != NULL) {
/* always keep the mapping around. */
- } else if (intel_obj->range_map_buffer != NULL) {
- /* Since we've emitted some blits to buffers that will (likely) be used
- * in rendering operations in other cache domains in this batch, emit a
- * flush. Once again, we wish for a domain tracker in libdrm to cover
- * usage inside of a batchbuffer.
- */
- intel_batchbuffer_emit_mi_flush(intel);
- free(intel_obj->range_map_buffer);
- intel_obj->range_map_buffer = NULL;
} else if (intel_obj->range_map_bo != NULL) {
if (intel_obj->mapped_gtt) {
drm_intel_gem_bo_unmap_gtt(intel_obj->range_map_bo);
@@ -441,19 +420,20 @@ intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj)
drm_intel_bo_unmap(intel_obj->range_map_bo);
}
- intel_emit_linear_blit(intel,
- intel_obj->buffer, obj->Offset,
- intel_obj->range_map_bo, 0,
- obj->Length);
+ if (intel_obj->needs_flush_at_unmap) {
+ intel_emit_linear_blit(intel,
+ intel_obj->buffer, obj->Offset,
+ intel_obj->range_map_bo, 0,
+ obj->Length);
+ drm_intel_bo_unreference(intel_obj->range_map_bo);
+ intel_batchbuffer_emit_mi_flush(intel);
+ }
/* Since we've emitted some blits to buffers that will (likely) be used
* in rendering operations in other cache domains in this batch, emit a
* flush. Once again, we wish for a domain tracker in libdrm to cover
* usage inside of a batchbuffer.
*/
- intel_batchbuffer_emit_mi_flush(intel);
-
- drm_intel_bo_unreference(intel_obj->range_map_bo);
intel_obj->range_map_bo = NULL;
} else if (intel_obj->buffer != NULL) {
if (intel_obj->mapped_gtt) {
@@ -462,6 +442,8 @@ intel_bufferobj_unmap(struct gl_context * ctx, struct gl_buffer_object *obj)
drm_intel_bo_unmap(intel_obj->buffer);
}
}
+
+ intel_obj->needs_flush_at_unmap = false;
obj->Pointer = NULL;
obj->Offset = 0;
obj->Length = 0;
diff --git a/src/mesa/drivers/dri/intel/intel_buffer_objects.h b/src/mesa/drivers/dri/intel/intel_buffer_objects.h
index e74d061..24a1636 100644
--- a/src/mesa/drivers/dri/intel/intel_buffer_objects.h
+++ b/src/mesa/drivers/dri/intel/intel_buffer_objects.h
@@ -47,9 +47,7 @@ struct intel_buffer_object
void *sys_buffer;
drm_intel_bo *range_map_bo;
- void *range_map_buffer;
- unsigned int range_map_offset;
- GLsizei range_map_size;
+ bool needs_flush_at_unmap;
GLboolean mapped_gtt;
GLboolean source;
--
1.7.6.4
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