linux-kernel - Re: [PATCH 6/9] dmaengine:pl330: set segment_boundary

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Date:	Fri, 4 Dec 2015 14:59:11 +0000
From:	Robin Murphy <robin.murphy@....com>
To:	Wang Hongcheng <annie.wang@....com>,
	Vinod Koul <vinod.koul@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Joerg Roedel <joro@...tes.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Tony Li <tony.li@....com>, Wan Zongshun <Vincent.Wan@....com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	iommu@...ts.linux-foundation.org, Huang Rui <ray.huang@....com>,
	Borislav Petkov <bp@...en8.de>, linux-serial@...r.kernel.org,
	dmaengine@...r.kernel.org, Ken Xue <ken.xue@....com>
Subject: Re: [PATCH 6/9] dmaengine:pl330: set segment_boundary_mask =
 0cffffffff

On 04/12/15 03:24, Wang Hongcheng wrote:
> Because amd iommu and software iommu need this mask.For example,
> if we use software iommu without this mask, we will
> get 'Out of SW-IOMMU space' error, when calling swiotlb_map_page
> function.

The commit title doesn't match the code, but either way this patch 
should now be unnecessary: 002edb6f6f2a ("dma-mapping: tidy up dma_parms 
default handling") resolves the problem at its source, and is already in 
4.4-rc1.

(Incidentally, it was specifically the same PL330/SWIOTLB combination 
that led to that patch in the first place)

Robin.

> Signed-off-by: Wan Zongshun <Vincent.Wan@....com>
> Signed-off-by: Wang Hongcheng <annie.wang@....com>
> ---
>   drivers/dma/pl330.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> index 9d7af0d..fb46fdf 100644
> --- a/drivers/dma/pl330.c
> +++ b/drivers/dma/pl330.c
> @@ -2966,6 +2966,10 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
>   	if (ret)
>   		dev_err(&adev->dev, "unable to set the seg size\n");
>
> +	dev_info(&adev->dev, "set the seg boundary\n");
> +	ret = dma_set_seg_boundary(&adev->dev, 0xffffffff);
> +	if (ret)
> +		dev_err(&adev->dev, "unable to set the seg boundary\n");
>
>   	dev_info(&adev->dev,
>   		 "Loaded driver for PL330 DMAC-%x\n", adev->periphid);
>

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