linux-kernel - Re: [PATCH] Handle init_iova_flush

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Date:   Fri, 18 Sep 2020 10:55:01 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Tom Murphy <murphyt7@....ie>, Robin Murphy <robin.murphy@....com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Handle init_iova_flush_queue failure in dma-iommu path

On Thu, Sep 10, 2020 at 01:25:38PM +0100, Tom Murphy wrote:
> init_iova_flush_queue can fail if we run out of memory. Fall back to noflush
>  queue if it fails.
> 
> Signed-off-by: Tom Murphy <murphyt7@....ie>
> ---
>  drivers/iommu/dma-iommu.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index 4959f5df21bd..5f69126f3e91 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -343,8 +343,11 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
>  
>  	if (!cookie->fq_domain && !iommu_domain_get_attr(domain,
>  			DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, &attr) && attr) {
> -		cookie->fq_domain = domain;
> -		init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all, NULL);
> +		if (init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all,
> +					NULL))
> +			pr_warn("iova flush queue initialization failed\n");
> +		else
> +			cookie->fq_domain = domain;
>  	}
>  
>  	if (!dev)

Looks good to me, but Robin should also have a look.