linux-kernel - Re: [PATCH] iommu: PGTABLE

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Message-ID: <2529dd93-2cb2-6ed8-20c0-c424e6613717@arm.com>
Date:   Thu, 30 Mar 2023 17:34:21 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        iommu@...ts.linux.dev, Conor Dooley <conor@...nel.org>,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] iommu: PGTABLE_LPAE is also for RISCV

On 2023-03-30 07:01, Randy Dunlap wrote:
> On riscv64, linux-next-20233030 (and for several days earlier),
> there is a kconfig warning:
> 
> WARNING: unmet direct dependencies detected for IOMMU_IO_PGTABLE_LPAE
>    Depends on [n]: IOMMU_SUPPORT [=y] && (ARM || ARM64 || COMPILE_TEST [=n]) && !GENERIC_ATOMIC64 [=n]
>    Selected by [y]:
>    - IPMMU_VMSA [=y] && IOMMU_SUPPORT [=y] && (ARCH_RENESAS [=y] || COMPILE_TEST [=n]) && !GENERIC_ATOMIC64 [=n]
> 
> and build errors:
> 
> riscv64-linux-ld: drivers/iommu/io-pgtable-arm.o: in function `.L140':
> io-pgtable-arm.c:(.init.text+0x1e8): undefined reference to `alloc_io_pgtable_ops'
> riscv64-linux-ld: drivers/iommu/io-pgtable-arm.o: in function `.L168':
> io-pgtable-arm.c:(.init.text+0xab0): undefined reference to `free_io_pgtable_ops'
> riscv64-linux-ld: drivers/iommu/ipmmu-vmsa.o: in function `.L140':
> ipmmu-vmsa.c:(.text+0xbc4): undefined reference to `free_io_pgtable_ops'
> riscv64-linux-ld: drivers/iommu/ipmmu-vmsa.o: in function `.L0 ':
> ipmmu-vmsa.c:(.text+0x145e): undefined reference to `alloc_io_pgtable_ops'
> 
> Add RISCV as an allowed ARCH dependency to fix these problems.
> 
> Fixes: d286a58bc8f4 ("iommu: Tidy up io-pgtable dependencies")

BTW that doesn't look like the right fix target - this presumably dates 
back as far as when ARCH_RENESAS was added to RISCV, such that it was 
possible to start selecting IPMMU_VMSA without COMPILE_TEST?

Thanks,
Robin.

> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Will Deacon <will@...nel.org>
> Cc: Robin Murphy <robin.murphy@....com>
> Cc: iommu@...ts.linux.dev
> Cc: Conor Dooley <conor@...nel.org>
> Cc: linux-riscv@...ts.infradead.org
> ---
>   drivers/iommu/Kconfig |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff -- a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -32,7 +32,7 @@ config IOMMU_IO_PGTABLE
>   config IOMMU_IO_PGTABLE_LPAE
>   	bool "ARMv7/v8 Long Descriptor Format"
>   	select IOMMU_IO_PGTABLE
> -	depends on ARM || ARM64 || COMPILE_TEST
> +	depends on ARM || ARM64 || RISCV || COMPILE_TEST
>   	depends on !GENERIC_ATOMIC64	# for cmpxchg64()
>   	help
>   	  Enable support for the ARM long descriptor pagetable format.