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Date: Tue, 17 Oct 2006 16:13:03 -0500
From: "Mike Miller (OS Dev)" <mikem@...rdog.cca.cpqcorp.net>
To: akpm@...l.org, jens.axboe@...e.de
Cc: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: [PATCH 2/2] cciss: disable dma prefetch for P600
PATCH 2/2
Turned off DMA prefetch for the P600 on systems which may present
discontiguous memory.
---
commit 68e76156e7a203a86996ac99c1326f098d3191f6
tree b191a99ae1bfa6588860136265f11f9ef789683a
parent 499cc64fc708f3a25985bea3b77b40c3448ccbf8
author Mike Miller <mikem@...rdog.cca.cpqcorp.net> Tue, 17 Oct 2006 16:02:22 -0500
committer Mike Miller <mikem@...rdog.cca.cpqcorp.net> Tue, 17 Oct 2006 16:02:22 -0500
Signed-off-by: Mike Miller <mikem@...rdog.cca.cpqcorp.net>
drivers/block/cciss.c | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index a0a1dd9..b445528 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -2982,6 +2982,21 @@ #ifdef CONFIG_X86
}
#endif
+#if defined CONFIG_IA64 || if defined CONFIG_X86_64
+ {
+ /* DMA prefetch must be disabled on P600 on platforms that may
+ * present noncontiguous memory.
+ */
+
+ __u32 dma_prefetch;
+ if(board_id == 0x3225103C) {
+ dma_prefetch = readl(c->vaddr + I2O0_DMA1_CFG);
+ dma_prefetch |= 0x8000;
+ writel(c->vaddr + I2O0_DMA1_CFG, dma_prefetch);
+ }
+ }
+#endif /* CONFIG_IA64 || CONFIG_X86_64 */
+
#ifdef CCISS_DEBUG
printk("Trying to put board into Simple mode\n");
#endif /* CCISS_DEBUG */
-
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