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

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Message-ID: <280c0994-f7cd-bb0e-8c68-62f72a4a38ca@ghiti.fr>
Date:   Tue, 16 May 2023 09:02:50 +0200
From:   Alexandre Ghiti <alex@...ti.fr>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Robin Murphy <robin.murphy@....com>,
        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

Hi Randy,


On 3/30/23 18:49, Randy Dunlap wrote:
>
> On 3/30/23 09:34, Robin Murphy wrote:
>> 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?
> OK, I can go with that. Thanks for your help.
>

Any updates on this fix?


Thanks,


Alex