From: isaacm@codeaurora.org
To: Robin Murphy <robin.murphy@arm.com>
Cc: iommu@lists.linux-foundation.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, freedreno@lists.freedesktop.org,
dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
pratikp@codeaurora.org, joro@8bytes.org, kernel-team@android.com,
will@kernel.org, pdaly@codeaurora.org
Subject: Re: [PATCH v2 3/7] iommu/arm-smmu: Add dependency on io-pgtable format modules
Date: Tue, 22 Dec 2020 11:49:32 -0800 [thread overview]
Message-ID: <e47f14b81d90772346ef28c9a7fd3365@codeaurora.org> (raw)
In-Reply-To: <3b0c191d-3fd0-73db-c1e3-4a80aa7953d7@arm.com>
On 2020-12-22 11:27, Robin Murphy wrote:
> On 2020-12-22 00:44, Isaac J. Manjarres wrote:
>> The SMMU driver depends on the availability of the ARM LPAE and
>> ARM V7S io-pgtable format code to work properly. In preparation
>
> Nit: we don't really depend on v7s - we *can* use it if it's
> available, address constraints are suitable, and the SMMU
> implementation actually supports it (many don't), but we can still
> quite happily not use it even so. LPAE is mandatory in the
> architecture so that's our only hard requirement, embodied in the
> kconfig select.
>
> This does mean there may technically still be a corner case involving
> ARM_SMMU=y and IO_PGTABLE_ARM_V7S=m, but at worst it's now a runtime
> failure rather than a build error, so unless and until anyone
> demonstrates that it actually matters I don't feel particularly
> inclined to give it much thought.
>
> Robin.
>
Okay, I'll fix up the commit message, as well as the code, so that it
only depends on io-pgtable-arm.
Thanks,
Isaac
>> for having the io-pgtable formats as modules, add a "pre"
>> dependency with MODULE_SOFTDEP() to ensure that the io-pgtable
>> format modules are loaded before loading the ARM SMMU driver module.
>>
>> Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
>> ---
>> drivers/iommu/arm/arm-smmu/arm-smmu.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c
>> b/drivers/iommu/arm/arm-smmu/arm-smmu.c
>> index d8c6bfd..a72649f 100644
>> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
>> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
>> @@ -2351,3 +2351,4 @@ MODULE_DESCRIPTION("IOMMU API for ARM
>> architected SMMU implementations");
>> MODULE_AUTHOR("Will Deacon <will@kernel.org>");
>> MODULE_ALIAS("platform:arm-smmu");
>> MODULE_LICENSE("GPL v2");
>> +MODULE_SOFTDEP("pre: io-pgtable-arm io-pgtable-arm-v7s");
>>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-12-22 19:50 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-22 0:44 [RFC PATCH v2 0/7] iommu: Permit modular builds of io-pgtable drivers Isaac J. Manjarres
2020-12-22 0:44 ` [PATCH v2 1/7] iommu/io-pgtable: Introduce dynamic io-pgtable fmt registration Isaac J. Manjarres
2020-12-22 19:27 ` Robin Murphy
2020-12-22 19:54 ` isaacm
2020-12-23 13:44 ` Robin Murphy
2020-12-23 15:14 ` isaacm
2020-12-23 15:38 ` Georgi Djakov
2020-12-23 19:17 ` kernel test robot
2020-12-22 0:44 ` [PATCH v2 2/7] iommu/io-pgtable: Add refcounting for io-pgtable format modules Isaac J. Manjarres
2020-12-22 0:44 ` [PATCH v2 3/7] iommu/arm-smmu: Add dependency on " Isaac J. Manjarres
2020-12-22 19:27 ` Robin Murphy
2020-12-22 19:49 ` isaacm [this message]
2020-12-23 13:05 ` Robin Murphy
2020-12-23 15:10 ` isaacm
2020-12-22 0:44 ` [PATCH v2 4/7] iommu/arm-smmu-v3: Add dependency on io-pgtable-arm format module Isaac J. Manjarres
2020-12-22 0:44 ` [PATCH v2 5/7] drm/msm: " Isaac J. Manjarres
2021-01-18 21:16 ` Rob Clark
2021-01-18 21:39 ` Will Deacon
2021-01-19 17:19 ` Rob Clark
2020-12-22 0:44 ` [PATCH v2 6/7] drm/panfrost: " Isaac J. Manjarres
2020-12-22 0:44 ` [PATCH v2 7/7] iommu/io-pgtable-arm: Allow building modular io-pgtable fmts Isaac J. Manjarres
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