From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966899Ab0GSVi5 (ORCPT ); Mon, 19 Jul 2010 17:38:57 -0400 Received: from relay1.sgi.com ([192.48.179.29]:53681 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966832Ab0GSVix (ORCPT ); Mon, 19 Jul 2010 17:38:53 -0400 Message-Id: <20100719213851.940567432@sgi.com> User-Agent: quilt/0.47-1 Date: Mon, 19 Jul 2010 16:32:23 -0500 From: steiner@sgi.com To: akpm@osdl.org, linux-kernel@vger.kernel.org Subject: [Patch 05/25] GRU - cbe cache flush References: <20100719213651.362618144@sgi.com> Content-Disposition: inline; filename=uv_gru_cbe_flush Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jack Steiner In some cases, for performance reasons flushing the SGI GRU cbe needs to dirty the cacheline before doing the cacheline flush. This ensures that the dirty cacheline actually goes back to the caching home agent. Update a reserved field in the CBE instead of a field that might be used. This _should_ not be required (dirtying any field should be ok) but early silicon has an issue here. Note that flushing the CL is not a requirement - only a performance enhancement. Signed-off-by: Jack Steiner --- drivers/misc/sgi-gru/grufault.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux/drivers/misc/sgi-gru/grufault.c =================================================================== --- linux.orig/drivers/misc/sgi-gru/grufault.c 2010-06-09 08:11:40.285085853 -0500 +++ linux/drivers/misc/sgi-gru/grufault.c 2010-06-09 08:11:41.157110138 -0500 @@ -306,7 +306,7 @@ upm: static void gru_flush_cache_cbe(struct gru_control_block_extended *cbe) { if (unlikely(cbe)) { - cbe->cbrexecstatus = 0; /* make CL dirty */ + cbe->reserved6 = 0; /* make CL dirty */ gru_flush_cache(cbe); } }