Re: "Convert the AMD iommu driver to the dma-iommu api" is buggy
From: Joerg Roedel
Date: Wed Oct 16 2019 - 12:03:19 EST
On Wed, Oct 16, 2019 at 11:53:33AM -0400, Qian Cai wrote:
> On Wed, 2019-10-16 at 17:31 +0200, Joerg Roedel wrote:
> The x86 one might just be a mistake.
>
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index ad05484d0c80..63c4b894751d 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -2542,7 +2542,7 @@ 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);
Yeah, that is a bug, I spotted that too.
> @@ -1185,7 +1185,7 @@ static struct iommu_dma_msi_page
> *iommu_dma_get_msi_page(struct device *dev,
> if (!iova)
> goto out_free_page;
>
> - if (iommu_map(domain, iova, msi_addr, size, prot))
> + if (iommu_map_atomic(domain, iova, msi_addr, size, prot))
> goto out_free_iova;
Not so sure this is a bug, this code is only about setting up MSIs on
ARM. It probably doesn't need to be atomic.
Regards,
Joerg