linux-kernel - Re: [PATCH] iommu/amd: Set AMD iommu callbacks for platform bus driver

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Date:	Mon, 9 May 2016 12:20:41 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Wan Zongshun <vincent.wan@....com>
Cc:	iommu@...ts.linux-foundation.org, vw@...mu.org,
	mcuos.com@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/amd: Set AMD iommu callbacks for platform bus
 driver

On Thu, Apr 14, 2016 at 09:28:53AM -0400, Wan Zongshun wrote:
> From: Wan Zongshun <Vincent.Wan@....com>
> 
> AMD has more drivers will use ACPI to platform bus driver later,
> all those devices need iommu support, such as eMMC acpi driver.
> 
> Signed-off-by: Wan Zongshun <Vincent.Wan@....com>
> ---
>  drivers/iommu/amd_iommu.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index c430c10..547cdd4 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -21,6 +21,7 @@
>  #include <linux/pci.h>
>  #include <linux/acpi.h>
>  #include <linux/amba/bus.h>
> +#include <linux/platform_device.h>
>  #include <linux/pci-ats.h>
>  #include <linux/bitmap.h>
>  #include <linux/slab.h>
> @@ -2980,6 +2981,9 @@ int __init amd_iommu_init_api(void)
>  	if (err)
>  		return err;
>  #endif
> +	err = bus_set_iommu(&platform_bus_type, &amd_iommu_ops);
> +	if (err)
> +		return err;

Is the platform_bus_type always defined or does this code needs to be
guarded by another ifdef?



	Joerg