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From: David Woodhouse <dwmw2@infradead.org>
To: Joerg Roedel <joro@8bytes.org>
Cc: Joerg Roedel <jroedel@suse.de>, Xiaojian Du <xiaojian.du@amd.com>,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	iommu@lists.linux-foundation.org, Huang Rui <ray.huang@amd.com>,
	Alex Deucher <alexander.deucher@amd.com>
Subject: Re: [PATCH 2/3] iommu/amd: Don't call early_amd_iommu_init() when AMD IOMMU is disabled
Date: Wed, 17 Mar 2021 13:37:16 +0000	[thread overview]
Message-ID: <3014DA56-84D8-474B-94FE-6FDBB6241F9F@infradead.org> (raw)
In-Reply-To: <YFIE8xnr/HWqxm4p@8bytes.org>



On 17 March 2021 13:32:35 GMT, Joerg Roedel <joro@8bytes.org> wrote:
>On Wed, Mar 17, 2021 at 11:47:11AM +0000, David Woodhouse wrote:
>> If you've already moved the Stoney Ridge check out of the way,
>there's
>> no real reason why you can't just set
>init_state=IOMMU_CMDLINE_DISABLED
>> directly from parse_amd_iommu_options(), is there? Then you don't
>need
>> the condition here at all?
>
>True, there is even more room for optimization. The amd_iommu_disabled
>variable can go away entirely, including its checks in
>early_amd_iommu_init(). I will do a patch-set on-top of this for v5.13
>which does more cleanups.

If we can get to the point where we don't even need to check amd_iommu_irq_remap in the ...select() function because the IRQ domain is never even registered in the case where the flag ends up false, all the better :)

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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  reply	other threads:[~2021-03-17 14:15 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-17  9:10 [PATCH 0/3] iommu/amd: Fix booting with amd_iommu=off Joerg Roedel
2021-03-17  9:10 ` [PATCH 1/3] iommu/amd: Move Stoney Ridge check to detect_ivrs() Joerg Roedel
2021-03-17  9:10 ` [PATCH 2/3] iommu/amd: Don't call early_amd_iommu_init() when AMD IOMMU is disabled Joerg Roedel
2021-03-17 11:47   ` David Woodhouse
2021-03-17 13:32     ` Joerg Roedel
2021-03-17 13:37       ` David Woodhouse [this message]
2021-03-17 14:24         ` Joerg Roedel
2021-03-17  9:10 ` [PATCH 3/3] iommu/amd: Keep track of amd_iommu_irq_remap state Joerg Roedel
2021-03-17 10:48 ` [PATCH 0/3] iommu/amd: Fix booting with amd_iommu=off Huang Rui
2021-03-18  9:47   ` Joerg Roedel

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