linux-kernel - Re: "Convert the AMD iommu driver to the dma-iommu api" is buggy

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Date:   Thu, 17 Oct 2019 10:39:13 -0400
From:   Qian Cai <cai@....pw>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Tom Murphy <murphyt7@....ie>, Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: "Convert the AMD iommu driver to the dma-iommu api" is buggy

On Wed, 2019-10-16 at 17:44 +0200, Joerg Roedel wrote:
> On Wed, Oct 16, 2019 at 10:59:42AM -0400, Qian Cai wrote:
> > BTW, the previous x86 warning was from only reverted one patch "iommu: Add gfp
> > parameter to iommu_ops::map" where proved to be insufficient. Now, pasting the
> > correct warning.
> 
> Can you please test this small fix:

This works fine so far.

> 
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index 78a2cca3ac5c..e7a4464e8594 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -2562,7 +2562,7 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
>  	if (iommu_prot & IOMMU_WRITE)
>  		prot |= IOMMU_PROT_IW;
>  
> -	ret = iommu_map_page(domain, iova, paddr, page_size, prot, GFP_KERNEL);
> +	ret = iommu_map_page(domain, iova, paddr, page_size, prot, gfp);
>  
>  	domain_flush_np_cache(domain, iova, page_size);
>  
>