From: John Garry <john.garry@huawei.com>
To: Lu Baolu <baolu.lu@linux.intel.com>, <joro@8bytes.org>,
<will@kernel.org>, <dwmw2@infradead.org>, <robin.murphy@arm.com>
Cc: <linux-kernel@vger.kernel.org>,
<iommu@lists.linux-foundation.org>, <linuxarm@huawei.com>,
<thunder.leizhen@huawei.com>, <chenxiang66@hisilicon.com>
Subject: Re: [PATCH v12 3/5] iommu/vt-d: Add support for IOMMU default DMA mode build options
Date: Mon, 14 Jun 2021 09:03:43 +0100 [thread overview]
Message-ID: <03675e2f-c3a6-ce33-ef96-f9ae544b2d13@huawei.com> (raw)
In-Reply-To: <f3940a3f-d1c1-148d-e4b5-51cecf924ff5@linux.intel.com>
On 12/06/2021 03:14, Lu Baolu wrote:
> On 2021/6/11 20:20, John Garry wrote:
>> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
>> index 2a71347611d4..4467353f981b 100644
>> --- a/drivers/iommu/Kconfig
>> +++ b/drivers/iommu/Kconfig
>> @@ -94,6 +94,7 @@ choice
>> prompt "IOMMU default DMA mode"
>> depends on IOMMU_DMA
>> + default IOMMU_DEFAULT_LAZY if INTEL_IOMMU
>> default IOMMU_DEFAULT_STRICT
>
> If two default values are different. Which one will be overridden?
If I understand your question correctly, I think you are asking if both
are set:
CONFIG_IOMMU_DEFAULT_LAZY=y
CONFIG_IOMMU_DEFAULT_STRICT=y
If this happens, then make defconfig complains about both being set, and
selects the 2nd, whatever that is.
If neither are set, then IOMMU_DEFAULT_LAZY is set if INTEL_IOMMU is
set, otherwise IOMMU_DEFAULT_STRICT.
Thanks,
John
next prev parent reply other threads:[~2021-06-14 8:09 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-11 12:20 [PATCH v12 0/5] Enhance " John Garry
2021-06-11 12:20 ` [PATCH v12 1/5] iommu: Print strict or lazy mode at init time John Garry
2021-06-14 15:54 ` Robin Murphy
2021-06-11 12:20 ` [PATCH v12 2/5] iommu: Enhance IOMMU default DMA mode build options John Garry
2021-06-12 1:21 ` Lu Baolu
2021-06-14 8:11 ` John Garry
2021-06-12 2:12 ` Lu Baolu
2021-06-14 16:03 ` Robin Murphy
2021-06-11 12:20 ` [PATCH v12 3/5] iommu/vt-d: Add support for " John Garry
2021-06-12 2:14 ` Lu Baolu
2021-06-14 8:03 ` John Garry [this message]
2021-06-15 7:26 ` Lu Baolu
2021-06-15 8:25 ` Robin Murphy
2021-06-16 8:42 ` Lu Baolu
2021-06-12 2:22 ` Lu Baolu
2021-06-14 7:53 ` John Garry
2021-06-14 14:11 ` Robin Murphy
2021-06-14 14:19 ` John Garry
2021-06-14 15:05 ` Robin Murphy
2021-06-11 12:20 ` [PATCH v12 4/5] iommu/amd: " John Garry
2021-06-11 12:20 ` [PATCH v12 5/5] iommu: Remove mode argument from iommu_set_dma_strict() John Garry
2021-06-12 2:23 ` Lu Baolu
2021-06-14 7:46 ` John Garry
2021-06-14 16:25 ` Robin Murphy
2021-06-14 17:03 ` John Garry
2021-06-14 17:19 ` Robin Murphy
2021-06-14 17:24 ` John Garry
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