linux-kernel - [PATCH 07/10] ioatdma: skip silicon bug workaround for pq

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Date:	Tue, 26 Mar 2013 15:43:15 -0700
From:	Dave Jiang <dave.jiang@...el.com>
To:	djbw@...com
Cc:	vinod.koul@...el.com, linux-kernel@...r.kernel.org
Subject: [PATCH 07/10] ioatdma: skip silicon bug workaround for pq_align for
 cb3.3

The alignment workaround is only necessary for cb3.2 or earlier platforms.

Signed-off-by: Dave Jiang <dave.jiang@...el.com>
---
 drivers/dma/ioat/dma_v3.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index a6d4175..a55c346 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -1549,10 +1549,14 @@ int ioat3_dma_probe(struct ioatdma_device *device, int dca)
 		dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
 		dma->device_prep_dma_xor_val = ioat3_prep_xor_val;
 	}
+
 	if (cap & IOAT_CAP_PQ) {
 		is_raid_device = true;
 		dma_set_maxpq(dma, 8, 0);
-		dma->pq_align = 6;
+		if (is_xeon_cb32(pdev))
+			dma->pq_align = 6;
+		else
+			dma->pq_align = 0;
 
 		dma_cap_set(DMA_PQ, dma->cap_mask);
 		dma->device_prep_dma_pq = ioat3_prep_pq;
@@ -1562,7 +1566,10 @@ int ioat3_dma_probe(struct ioatdma_device *device, int dca)
 
 		if (!(cap & IOAT_CAP_XOR)) {
 			dma->max_xor = 8;
-			dma->xor_align = 6;
+			if (is_xeon_cb32(pdev))
+				dma->xor_align = 6;
+			else
+				dma->xor_align = 0;
 
 			dma_cap_set(DMA_XOR, dma->cap_mask);
 			dma->device_prep_dma_xor = ioat3_prep_pqxor;
@@ -1571,6 +1578,7 @@ int ioat3_dma_probe(struct ioatdma_device *device, int dca)
 			dma->device_prep_dma_xor_val = ioat3_prep_pqxor_val;
 		}
 	}
+
 	if (is_raid_device && (cap & IOAT_CAP_FILL_BLOCK)) {
 		dma_cap_set(DMA_MEMSET, dma->cap_mask);
 		dma->device_prep_dma_memset = ioat3_prep_memset_lock;

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