linux-kernel - [PATCH 20/30] amd64_edac: Correct node interleaving removal

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Date:	Thu, 10 Feb 2011 18:15:23 +0100
From:	Borislav Petkov <bp@...64.org>
To:	<linux-edac@...r.kernel.org>
Cc:	<linux-kernel@...r.kernel.org>,
	Borislav Petkov <borislav.petkov@....com>
Subject: [PATCH 20/30] amd64_edac: Correct node interleaving removal

From: Borislav Petkov <borislav.petkov@....com>

When node interleaving is enabled, a subset of the addr[14:12] bits has
to be removed in order to get the normalized DCT address of the DRAM
channel. The actual number of bits to remove is determined by F1x[1,
0][7C:40][IntlvEn]. Do this correctly.

Signed-off-by: Borislav Petkov <borislav.petkov@....com>
---
 drivers/edac/amd64_edac.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 9ea1bb4..f3f4ee9 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1406,10 +1406,10 @@ static int f10_match_to_this_node(struct amd64_pvt *pvt, int range,
 	chan_addr = f10_get_norm_dct_addr(pvt, range, sys_addr,
 					  high_range, dct_sel_base);
 
-	/* remove Node ID (in case of node interleaving) */
-	tmp = chan_addr & 0xFC0;
-
-	chan_addr = ((chan_addr >> hweight8(intlv_en)) & GENMASK(12, 47)) | tmp;
+	/* Remove node interleaving, see F1x120 */
+	if (intlv_en)
+		chan_addr = ((chan_addr >> (12 + hweight8(intlv_en))) << 12) |
+			    (chan_addr & 0xfff);
 
 	/* remove channel interleave and hash */
 	if (dct_interleave_enabled(pvt) &&
-- 
1.7.4.rc2

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