From: Jon Hunter <jonathanh@nvidia.com>
To: Robin Murphy <robin.murphy@arm.com>, Krishna Reddy <vdumpa@nvidia.com>
Cc: talho@nvidia.com, treding@nvidia.com, bhuntsman@nvidia.com,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
mperttunen@nvidia.com, nicoleotsuka@gmail.com, snikam@nvidia.com,
nicolinc@nvidia.com, linux-tegra@vger.kernel.org,
yhsu@nvidia.com, praithatha@nvidia.com, will@kernel.org,
linux-arm-kernel@lists.infradead.org, bbiswas@nvidia.com
Subject: Re: [PATCH v8 3/3] iommu/arm-smmu: Add global/context fault implementation hooks
Date: Tue, 30 Jun 2020 13:42:52 +0100 [thread overview]
Message-ID: <fd1f1102-ab05-002a-a86a-d3c6cef21e01@nvidia.com> (raw)
In-Reply-To: <6c2ce909-c71b-351f-79f5-b1a4b4c0e4ac@arm.com>
On 30/06/2020 13:13, Robin Murphy wrote:
> On 2020-06-30 09:37, Jon Hunter wrote:
>>
>> On 30/06/2020 01:10, Krishna Reddy wrote:
>>> Add global/context fault hooks to allow NVIDIA SMMU implementation
>>> handle faults across multiple SMMUs.
>>
>> Nit ... this is not just for NVIDIA, but this allows anyone to add
>> custom global/context and fault hooks. So I think that the changelog
>> should be clear that this change permits custom fault hooks and that
>> custom fault hooks are needed for the Tegra194 SMMU. You may also want
>> to say why.
>>
>>>
>>> Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
>>> ---
>>> drivers/iommu/arm-smmu-nvidia.c | 98 +++++++++++++++++++++++++++++++++
>>> drivers/iommu/arm-smmu.c | 17 +++++-
>>> drivers/iommu/arm-smmu.h | 3 +
>>> 3 files changed, 116 insertions(+), 2 deletions(-)
...
>>> @@ -835,7 +836,13 @@ static int arm_smmu_init_domain_context(struct
>>> iommu_domain *domain,
>>> * handler seeing a half-initialised domain state.
>>> */
>>> irq = smmu->irqs[smmu->num_global_irqs + cfg->irptndx];
>>> - ret = devm_request_irq(smmu->dev, irq, arm_smmu_context_fault,
>>> +
>>> + if (smmu->impl && smmu->impl->context_fault)
>>> + context_fault = smmu->impl->context_fault;
>>> + else
>>> + context_fault = arm_smmu_context_fault;
>>
>> Why not see the default smmu->impl->context_fault to
>> arm_smmu_context_fault in arm_smmu_impl_init() and then allow the
>> various implementations to override as necessary? Then you can get rid
>> of this context_fault variable here and just use
>> smmu->impl->context_fault below.
>
> Because the default smmu->impl is NULL. And as I've said before, NAK to
> forcing the common case to allocate a set of "quirks" purely to override
> the default IRQ handler with the default IRQ handler ;)
Ah OK, makes sense. Sorry I am a bit late to the review :-)
Jon
--
nvpublic
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next prev parent reply other threads:[~2020-06-30 12:44 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-30 0:10 [PATCH v8 0/3] Nvidia Arm SMMUv2 Implementation Krishna Reddy
2020-06-30 0:10 ` [PATCH v8 1/3] iommu/arm-smmu: add NVIDIA implementation for dual ARM MMU-500 usage Krishna Reddy
2020-06-30 0:16 ` Nicolin Chen
2020-06-30 5:54 ` Pritesh Raithatha
2020-06-30 8:19 ` Jon Hunter
2020-06-30 14:53 ` Robin Murphy
2020-06-30 15:17 ` Jon Hunter
2020-07-01 18:18 ` Krishna Reddy
2020-07-01 18:56 ` Robin Murphy
2020-07-01 19:12 ` Krishna Reddy
2020-06-30 17:04 ` Krishna Reddy
2020-06-30 10:17 ` Jon Hunter
2020-06-30 16:23 ` Krishna Reddy
2020-06-30 16:32 ` Jon Hunter
2020-06-30 16:44 ` Jon Hunter
2020-06-30 17:16 ` Krishna Reddy
2020-06-30 19:03 ` Jon Hunter
2020-06-30 20:21 ` Krishna Reddy
2020-06-30 0:10 ` [PATCH v8 2/3] dt-bindings: arm-smmu: Add binding for Tegra194 SMMU Krishna Reddy
2020-06-30 6:01 ` Pritesh Raithatha
2020-06-30 8:21 ` Jon Hunter
2020-06-30 12:27 ` Robin Murphy
2020-07-01 18:28 ` Krishna Reddy
2020-07-01 18:47 ` Jon Hunter
2020-07-01 19:00 ` Krishna Reddy
2020-07-01 19:31 ` Jon Hunter
2020-07-01 19:39 ` Krishna Reddy
2020-07-02 16:05 ` Robin Murphy
2020-07-01 19:03 ` Robin Murphy
2020-06-30 0:10 ` [PATCH v8 3/3] iommu/arm-smmu: Add global/context fault implementation hooks Krishna Reddy
2020-06-30 0:19 ` Nicolin Chen
2020-06-30 5:58 ` Pritesh Raithatha
2020-06-30 8:37 ` Jon Hunter
2020-06-30 12:13 ` Robin Murphy
2020-06-30 12:42 ` Jon Hunter [this message]
2020-07-01 18:48 ` Krishna Reddy
2020-07-01 19:14 ` Robin Murphy
2020-07-01 19:22 ` Krishna Reddy
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