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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!


WARNING: multiple messages have this Message-ID
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-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linuxarm@huawei.com, iommu@lists.linux-foundation.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!

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply	other threads:[~2021-06-18  7:49 UTC|newest]

Thread overview: 38+ 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 ` John Garry
2021-06-16 11:03 ` [PATCH v13 1/6] iommu: Deprecate Intel and AMD cmdline methods to enable strict mode John Garry
2021-06-16 11:03   ` John Garry
2021-06-17 19:01   ` Robin Murphy
2021-06-17 19:01     ` Robin Murphy
2021-06-18  7:43     ` John Garry [this message]
2021-06-18  7:43       ` John Garry
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   ` 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   ` John Garry
2021-06-16 11:03 ` [PATCH v13 4/6] iommu/vt-d: Add support for " John Garry
2021-06-16 11:03   ` John Garry
2021-06-17  7:32   ` Lu Baolu
2021-06-17  7:32     ` Lu Baolu
2021-06-17  8:00     ` John Garry
2021-06-17  8:00       ` John Garry
2021-06-17 19:03       ` Robin Murphy
2021-06-17 19:03         ` Robin Murphy
2021-06-18  1:46       ` Lu Baolu
2021-06-18  1:46         ` Lu Baolu
2021-06-18  7:31         ` John Garry
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   ` John Garry
2021-06-16 11:03 ` [PATCH v13 6/6] iommu: Remove mode argument from iommu_set_dma_strict() John Garry
2021-06-16 11:03   ` John Garry
2021-06-17  7:36   ` Lu Baolu
2021-06-17  7:36     ` Lu Baolu
2021-06-17  7:41     ` John Garry
2021-06-17  7:41       ` John Garry
2021-06-18  1:52       ` Lu Baolu
2021-06-18  1:52         ` Lu Baolu
2021-06-17 18:56     ` Robin Murphy
2021-06-17 18:56       ` Robin Murphy
2021-06-18  1:51       ` Lu Baolu
2021-06-18  1:51         ` Lu Baolu

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