linux-kernel - Re: [PATCH 12/13] iommu/virtio: Clean up bus_set

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Date:   Thu, 21 Apr 2022 18:12:45 +0100
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     joro@...tes.org, will@...nel.org, iommu@...ts.linux-foundation.org,
        sven@...npeter.dev, robdclark@...il.com, m.szyprowski@...sung.com,
        baolu.lu@...ux.intel.com, yong.wu@...iatek.com,
        mjrosato@...ux.ibm.com, gerald.schaefer@...ux.ibm.com,
        zhang.lyra@...il.com, thierry.reding@...il.com, vdumpa@...dia.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/13] iommu/virtio: Clean up bus_set_iommu()

On Thu, Apr 14, 2022 at 01:42:41PM +0100, Robin Murphy wrote:
> Stop calling bus_set_iommu() since it's now unnecessary, and simplify
> the probe failure path accordingly.
> 
> Signed-off-by: Robin Murphy <robin.murphy@....com>
> ---
>  drivers/iommu/virtio-iommu.c | 24 ------------------------
>  1 file changed, 24 deletions(-)
> 
> diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
> index 25be4b822aa0..371f8657c0ce 100644
> --- a/drivers/iommu/virtio-iommu.c
> +++ b/drivers/iommu/virtio-iommu.c
> @@ -7,7 +7,6 @@
>  
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>  
> -#include <linux/amba/bus.h>
>  #include <linux/delay.h>
>  #include <linux/dma-iommu.h>
>  #include <linux/dma-map-ops.h>

<linux/platform_device.h> isn't needed anymore either. In any case it
looks great, thanks

Reviewed-by: Jean-Philippe Brucker <jean-philippe@...aro.org>

and tested on QEMU (so only PCI for now)


> @@ -1146,26 +1145,6 @@ static int viommu_probe(struct virtio_device *vdev)
>  
>  	iommu_device_register(&viommu->iommu, &viommu_ops, parent_dev);
>  
> -#ifdef CONFIG_PCI
> -	if (pci_bus_type.iommu_ops != &viommu_ops) {
> -		ret = bus_set_iommu(&pci_bus_type, &viommu_ops);
> -		if (ret)
> -			goto err_unregister;
> -	}
> -#endif
> -#ifdef CONFIG_ARM_AMBA
> -	if (amba_bustype.iommu_ops != &viommu_ops) {
> -		ret = bus_set_iommu(&amba_bustype, &viommu_ops);
> -		if (ret)
> -			goto err_unregister;
> -	}
> -#endif
> -	if (platform_bus_type.iommu_ops != &viommu_ops) {
> -		ret = bus_set_iommu(&platform_bus_type, &viommu_ops);
> -		if (ret)
> -			goto err_unregister;
> -	}
> -
>  	vdev->priv = viommu;
>  
>  	dev_info(dev, "input address: %u bits\n",
> @@ -1174,9 +1153,6 @@ static int viommu_probe(struct virtio_device *vdev)
>  
>  	return 0;
>  
> -err_unregister:
> -	iommu_device_sysfs_remove(&viommu->iommu);
> -	iommu_device_unregister(&viommu->iommu);
>  err_free_vqs:
>  	vdev->config->del_vqs(vdev);
>  
> -- 
> 2.28.0.dirty
>