linux-kernel - Re: [PATCH] iommu/io-pgtable: Make IOMMU_IO_PGTABLE

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Date:   Tue, 27 Sep 2022 15:15:06 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Sven Peter <sven@...npeter.dev>, Janne Grunau <j@...nau.net>,
        Hector Martin <marcan@...can.st>
Cc:     iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/io-pgtable: Make IOMMU_IO_PGTABLE_DART invisible

On 2022-09-27 14:36, Geert Uytterhoeven wrote:
> There is no point in asking the user about both "Apple DART Formats" and
> "Apple DART IOMMU Support", as the former is useless without the latter,
> and the latter auto-selects the former.
> 
> Fixes: 745ef1092bcfcf3b ("iommu/io-pgtable: Move Apple DART support to its own file")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> Should IOMMU_IO_PGTABLE_LPAE and IOMMU_IO_PGTABLE_ARMV7S be made
> invisible, too?
> Are there users that do not select them?

The aim was for formats to be independently selectable for COMPILE_TEST 
coverage. The Arm formats are manually selectable for the sake of their 
runtime self-tests, which are self-contained, but since DART format 
doesn't do anything by itself I'd agree there's no need to prompt when 
!COMPILE_TEST here.

Thanks,
Robin.

> ---
>   drivers/iommu/Kconfig | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> index dc5f7a156ff5ec73..f1affca6022e0a54 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -68,16 +68,13 @@ config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
>   	  If unsure, say N here.
>   
>   config IOMMU_IO_PGTABLE_DART
> -	bool "Apple DART Formats"
> +	bool
>   	select IOMMU_IO_PGTABLE
> -	depends on ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
>   	help
>   	  Enable support for the Apple DART pagetable formats. These include
>   	  the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family
>   	  SoCs.
>   
> -	  If unsure, say N here.
> -
>   endmenu
>   
>   config IOMMU_DEBUGFS