From c796aed5ddad011d66e631c4cafdbf779e73f213 Mon Sep 17 00:00:00 2001 From: Keith Whitwell Date: Thu, 5 Nov 2009 13:57:05 +0000 Subject: i965g: add lots of error checks and early returns Any allocation that may fail should be checked, and propogate the error upwards. At the highest level we will flush batch and retry. This is an alternate strategy to what the original DRI driver did of attempting to flush batch from the lowest levels (eg inside BEGIN_BATCH). The trouble with that strategy was that flushes could occur at unexpected times, and additionally there was a need for a wierd notification mechanism to propogate the 'lost context' state back up to higher levels. Propogating the errors directly gives us a lot of flexibility how to deal with these states, at the expense of a lot more checking in the code. Will add some sanity checks later to make sure that out-of-memory conditions are properly escalated and not lost halfway up the stack. --- src/gallium/winsys/drm/i965/xlib/xlib_i965.c | 46 +++++++++++----------------- 1 file changed, 18 insertions(+), 28 deletions(-) (limited to 'src/gallium/winsys') diff --git a/src/gallium/winsys/drm/i965/xlib/xlib_i965.c b/src/gallium/winsys/drm/i965/xlib/xlib_i965.c index b1edca818a..fc465d7c14 100644 --- a/src/gallium/winsys/drm/i965/xlib/xlib_i965.c +++ b/src/gallium/winsys/drm/i965/xlib/xlib_i965.c @@ -134,11 +134,12 @@ const char *data_types[BRW_DATA_MAX] = }; -static struct brw_winsys_buffer * +static enum pipe_error xlib_brw_bo_alloc( struct brw_winsys_screen *sws, - enum brw_buffer_type type, - unsigned size, - unsigned alignment ) + enum brw_buffer_type type, + unsigned size, + unsigned alignment, + struct brw_winsys_buffer **bo_out ) { struct xlib_brw_winsys *xbw = xlib_brw_winsys(sws); struct xlib_brw_buffer *buf; @@ -148,12 +149,13 @@ xlib_brw_bo_alloc( struct brw_winsys_screen *sws, buf = CALLOC_STRUCT(xlib_brw_buffer); if (!buf) - return NULL; + return PIPE_ERROR_OUT_OF_MEMORY; + + pipe_reference_init(&buf->base.reference, 1); buf->offset = align(xbw->offset, alignment); buf->type = type; buf->virtual = MALLOC(size); - buf->cheesy_refcount = 1; buf->base.offset = &buf->offset; /* hmm, cheesy */ buf->base.size = size; @@ -161,36 +163,25 @@ xlib_brw_bo_alloc( struct brw_winsys_screen *sws, if (xbw->offset > MAX_VRAM) goto err; - return &buf->base; + /* XXX: possibly rentrant call to bo_destroy: + */ + bo_reference(bo_out, &buf->base); + return PIPE_OK; err: assert(0); + FREE(buf->virtual); FREE(buf); - return NULL; -} - -static void -xlib_brw_bo_reference( struct brw_winsys_buffer *buffer ) -{ - struct xlib_brw_buffer *buf = xlib_brw_buffer(buffer); - - buf->cheesy_refcount++; + return PIPE_ERROR_OUT_OF_MEMORY; } static void -xlib_brw_bo_unreference( struct brw_winsys_buffer *buffer ) +xlib_brw_bo_destroy( struct brw_winsys_buffer *buffer ) { struct xlib_brw_buffer *buf = xlib_brw_buffer(buffer); - /* As a special favor in this call only, buffer is allowed to be - * NULL: - */ - if (buffer == NULL) - return; - - if (--buf->cheesy_refcount == 0) { - FREE(buffer); - } + FREE(buf->virtual); + FREE(buf); } static int @@ -378,8 +369,7 @@ xlib_create_brw_winsys_screen( void ) ws->base.destroy = xlib_brw_winsys_destroy; ws->base.bo_alloc = xlib_brw_bo_alloc; - ws->base.bo_reference = xlib_brw_bo_reference; - ws->base.bo_unreference = xlib_brw_bo_unreference; + ws->base.bo_destroy = xlib_brw_bo_destroy; ws->base.bo_emit_reloc = xlib_brw_bo_emit_reloc; ws->base.bo_exec = xlib_brw_bo_exec; ws->base.bo_subdata = xlib_brw_bo_subdata; -- cgit v1.2.3