linux-kernel - Re: [PATCH v6 3/7] of: fix size when dma-range is not used

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Date:	Fri, 6 Feb 2015 14:38:12 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Murali Karicheri <m-karicheri2@...com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <Will.Deacon@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>
Subject: Re: [PATCH v6 3/7] of: fix size when dma-range is not used

On Thu, Feb 05, 2015 at 09:52:55PM +0000, Murali Karicheri wrote:
> Fix the dma-range size when the DT attribute is missing. i.e  set size to
> dev->coherent_dma_mask + 1 instead of dev->coherent_dma_mask. Also add
> code to check invalid values of size configured in DT and log error.
> 
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Grant Likely <grant.likely@...aro.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> 
> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
> ---
>  drivers/of/device.c |   17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/of/device.c b/drivers/of/device.c
> index 2de320d..314c8a9 100644
> --- a/drivers/of/device.c
> +++ b/drivers/of/device.c
> @@ -105,9 +105,24 @@ void of_dma_configure(struct device *dev, struct device_node *np)
>  	ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
>  	if (ret < 0) {
>  		dma_addr = offset = 0;
> -		size = dev->coherent_dma_mask;
> +		size = dev->coherent_dma_mask + 1;
>  	} else {
>  		offset = PFN_DOWN(paddr - dma_addr);
> +
> +		/*
> +		 * Add a work around to treat the size as mask + 1 in case
> +		 * it is defined in DT as a mask.
> +		 */
> +		if (size & 1) {
> +			dev_warn(dev, "Invalid size 0x%llx for dma-range\n",
> +				 size);
> +			size = size + 1;
> +		}
> +
> +		if (!size) {
> +			dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
> +			return;
> +		}

Would it make sense to set coherent_dma_mask to 0 here to make this more
noticeable? It can be done together with the mask calculation from size.

-- 
Catalin
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