linux-kernel - Re: ioatdma: add ioat_raid

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Date:	Fri, 02 Aug 2013 19:26:03 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	Dan Williams <djbw@...com>
CC:	"Jiang, Dave" <dave.jiang@...el.com>,
	"Mason, Jon" <jon.mason@...el.com>,
	"Koul, Vinod" <vinod.koul@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: ioatdma: add ioat_raid_enabled module parameter

Le 02/08/2013 18:57, Dan Williams a écrit :
> I like Jon¹s suggestion.  Just make raid disabled by default on non-atom
> platforms.  When if a non-atom platform comes along without the previous
> restrictions it can add itself to this list.
>
> So let¹s drop the module parameter and just cleanup the 3.2 support to
> reflect the current reality of raid being disabled.

So you want this instead ?

Brice


ioatdma: disable RAID on non-Atom platforms and reenable unaligned copies

Disable RAID on non-Atom platform and remove the 64-byte alignement
restriction on legacy DMA operations (introduced in commit f26df1a1
as a workaround for silicon errata).

Signed-off-by: Brice Goglin <Brice.Goglin@...ia.fr>
---
 drivers/dma/ioat/dma_v3.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

Index: b/drivers/dma/ioat/dma_v3.c
===================================================================
--- a/drivers/dma/ioat/dma_v3.c	2013-07-31 23:06:24.163810000 +0200
+++ b/drivers/dma/ioat/dma_v3.c	2013-08-02 19:17:26.075745688 +0200
@@ -1775,15 +1775,12 @@ int ioat3_dma_probe(struct ioatdma_devic
 	dma->device_alloc_chan_resources = ioat2_alloc_chan_resources;
 	dma->device_free_chan_resources = ioat2_free_chan_resources;
 
-	if (is_xeon_cb32(pdev))
-		dma->copy_align = 6;
-
 	dma_cap_set(DMA_INTERRUPT, dma->cap_mask);
 	dma->device_prep_dma_interrupt = ioat3_prep_interrupt_lock;
 
 	device->cap = readl(device->reg_base + IOAT_DMA_CAP_OFFSET);
 
-	if (is_bwd_noraid(pdev))
+	if (is_xeon_cb32(pdev) || is_bwd_noraid(pdev))
 		device->cap &= ~(IOAT_CAP_XOR | IOAT_CAP_PQ | IOAT_CAP_RAID16SS);
 
 	/* dca is incompatible with raid operations */

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