linux-kernel - Re: [PATCH] crypto: qat - stop using iommu

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Date:   Sun, 10 Apr 2022 20:52:14 +0100
From:   Giovanni Cabiddu <giovanni.cabiddu@...el.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     herbert@...dor.apana.org.au, davem@...emloft.net,
        qat-linux@...el.com, linux-crypto@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: qat - stop using iommu_present()

On Tue, Apr 05, 2022 at 01:25:11PM +0100, Robin Murphy wrote:
> Even if an IOMMU might be present for some PCI segment in the system,
> that doesn't necessarily mean it provides translation for the device
> we care about. Replace iommu_present() with a more appropriate check.
> 
> Signed-off-by: Robin Murphy <robin.murphy@....com>
> ---
>  drivers/crypto/qat/qat_common/adf_sriov.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/crypto/qat/qat_common/adf_sriov.c b/drivers/crypto/qat/qat_common/adf_sriov.c
> index b960bca1f9d2..7f9c18dc4540 100644
> --- a/drivers/crypto/qat/qat_common/adf_sriov.c
> +++ b/drivers/crypto/qat/qat_common/adf_sriov.c
> @@ -3,7 +3,6 @@
>  #include <linux/workqueue.h>
>  #include <linux/pci.h>
>  #include <linux/device.h>
> -#include <linux/iommu.h>
>  #include "adf_common_drv.h"
>  #include "adf_cfg.h"
>  #include "adf_pfvf_pf_msg.h"
> @@ -176,7 +175,7 @@ int adf_sriov_configure(struct pci_dev *pdev, int numvfs)
>  		return -EFAULT;
>  	}
>  
> -	if (!iommu_present(&pci_bus_type))
> +	if (!device_iommu_mapped(&pdev->dev))
>  		dev_warn(&pdev->dev, "IOMMU should be enabled for SR-IOV to work correctly\n");
>  
>  	if (accel_dev->pf.vf_info) {
> -- 
> 2.28.0.dirty
> 
I tried this patch and it appears to work as expected.

Acked-by: Giovanni Cabiddu <giovanni.cabiddu@...el.com>

Regards,

-- 
Giovanni