linux-kernel - Re: [PATCH v2] of/device: Update dma_range_map only when dev has valid dma-ranges

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Message-ID: <YBFj9whLvqlV2erm@aptenodytes>
Date:   Wed, 27 Jan 2021 14:00:39 +0100
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Tomasz Figa <tfiga@...gle.com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        Nicolas Boichat <drinkcat@...omium.org>,
        Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH v2] of/device: Update dma_range_map only when dev has
 valid dma-ranges

Hi,

On Tue 19 Jan 21, 18:52, Yong Wu wrote:
> The commit e0d072782c73 ("dma-mapping: introduce DMA range map,
> supplanting dma_pfn_offset") always update dma_range_map even though it was
> already set, like in the sunxi_mbus driver. the issue is reported at [1].
> This patch avoid this(Updating it only when dev has valid dma-ranges).
> 
> Meanwhile, dma_range_map contains the devices' dma_ranges information,
> This patch moves dma_range_map before of_iommu_configure. The iommu
> driver may need to know the dma_address requirements of its iommu
> consumer devices.

Just a gentle ping on this issue, it would be nice to have this fix merged
ASAP, in the next RC :)

Cheers,

Paul

> [1] https://lore.kernel.org/linux-arm-kernel/5c7946f3-b56e-da00-a750-be097c7ceb32@arm.com/
> 
> CC: Rob Herring <robh+dt@...nel.org>
> CC: Frank Rowand <frowand.list@...il.com>
> Fixes: e0d072782c73 ("dma-mapping: introduce DMA range map, supplanting dma_pfn_offset"),
> Suggested-by: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>  drivers/of/device.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/of/device.c b/drivers/of/device.c
> index aedfaaafd3e7..1122daa8e273 100644
> --- a/drivers/of/device.c
> +++ b/drivers/of/device.c
> @@ -162,9 +162,11 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
>  	mask = DMA_BIT_MASK(ilog2(end) + 1);
>  	dev->coherent_dma_mask &= mask;
>  	*dev->dma_mask &= mask;
> -	/* ...but only set bus limit if we found valid dma-ranges earlier */
> -	if (!ret)
> +	/* ...but only set bus limit and range map if we found valid dma-ranges earlier */
> +	if (!ret) {
>  		dev->bus_dma_limit = end;
> +		dev->dma_range_map = map;
> +	}
>  
>  	coherent = of_dma_is_coherent(np);
>  	dev_dbg(dev, "device is%sdma coherent\n",
> @@ -172,6 +174,9 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
>  
>  	iommu = of_iommu_configure(dev, np, id);
>  	if (PTR_ERR(iommu) == -EPROBE_DEFER) {
> +		/* Don't touch range map if it wasn't set from a valid dma-ranges */
> +		if (!ret)
> +			dev->dma_range_map = NULL;
>  		kfree(map);
>  		return -EPROBE_DEFER;
>  	}
> @@ -181,7 +186,6 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
>  
>  	arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);
>  
> -	dev->dma_range_map = map;
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(of_dma_configure_id);
> -- 
> 2.18.0
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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