From: John Garry <john.garry@huawei.com>
To: Robin Murphy <robin.murphy@arm.com>, <joro@8bytes.org>,
<will@kernel.org>, <dwmw2@infradead.org>,
<baolu.lu@linux.intel.com>, <corbet@lwn.net>
Cc: <linux-kernel@vger.kernel.org>,
<iommu@lists.linux-foundation.org>, <linuxarm@huawei.com>,
<thunder.leizhen@huawei.com>, <chenxiang66@hisilicon.com>,
<linux-doc@vger.kernel.org>
Subject: Re: [PATCH v13 1/6] iommu: Deprecate Intel and AMD cmdline methods to enable strict mode
Date: Fri, 18 Jun 2021 08:43:32 +0100 [thread overview]
Message-ID: <c8ca952e-4070-0a48-0a77-1cdf6985bb19@huawei.com> (raw)
In-Reply-To: <f95252ce-f834-103b-f96d-7e35fa59d5ec@arm.com>
On 17/06/2021 20:01, Robin Murphy wrote:
>> DMA.
>> - strict [Default Off]
>> + strict [Default Off] [Deprecated, use iommu.strict instead]
>> With this option on every unmap_single operation will
>> result in a hardware IOTLB flush operation as opposed
>> to batching them for performance.
>
> FWIW I'd be inclined to replace both whole descriptions with just
> something like "Deprecated, equivalent to iommu.strict=1".
>
>> diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
>> index 46280e6e1535..9f3096d650aa 100644
>> --- a/drivers/iommu/amd/init.c
>> +++ b/drivers/iommu/amd/init.c
>> @@ -3098,8 +3098,10 @@ static int __init parse_amd_iommu_intr(char *str)
>> static int __init parse_amd_iommu_options(char *str)
>> {
>> for (; *str; ++str) {
>> - if (strncmp(str, "fullflush", 9) == 0)
>> + if (strncmp(str, "fullflush", 9) == 0) {
>> + pr_warn("amd_iommu=fullflush deprecated; use iommu.strict
>> instead\n");
>
> Nit: maybe we should spell out "...use <option>=1 instead" in all of
> these messages just in case anyone takes them literally?
> (I'm not sure
> the options parse correctly with no argument)
I don't think they do.
But I'll take both suggestions on board.
>
> Either way,
>
> Acked-by: Robin Murphy <robin.murphy@arm.com>
Cheers!
next prev parent reply other threads:[~2021-06-18 7:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-16 11:03 [PATCH v13 0/6] iommu: Enhance IOMMU default DMA mode build options John Garry
2021-06-16 11:03 ` [PATCH v13 1/6] iommu: Deprecate Intel and AMD cmdline methods to enable strict mode John Garry
2021-06-17 19:01 ` Robin Murphy
2021-06-18 7:43 ` John Garry [this message]
2021-06-16 11:03 ` [PATCH v13 2/6] iommu: Print strict or lazy mode at init time John Garry
2021-06-16 11:03 ` [PATCH v13 3/6] iommu: Enhance IOMMU default DMA mode build options John Garry
2021-06-16 11:03 ` [PATCH v13 4/6] iommu/vt-d: Add support for " John Garry
2021-06-17 7:32 ` Lu Baolu
2021-06-17 8:00 ` John Garry
2021-06-17 19:03 ` Robin Murphy
2021-06-18 1:46 ` Lu Baolu
2021-06-18 7:31 ` John Garry
2021-06-16 11:03 ` [PATCH v13 5/6] iommu/amd: " John Garry
2021-06-16 11:03 ` [PATCH v13 6/6] iommu: Remove mode argument from iommu_set_dma_strict() John Garry
2021-06-17 7:36 ` Lu Baolu
2021-06-17 7:41 ` John Garry
2021-06-18 1:52 ` Lu Baolu
2021-06-17 18:56 ` Robin Murphy
2021-06-18 1:51 ` Lu Baolu
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