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From: Robin Murphy <robin.murphy@arm.com>
To: "Heiko Stübner" <heiko@sntech.de>, joro@8bytes.org, will@kernel.org
Cc: iommu@lists.linux-foundation.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, suravee.suthikulpanit@amd.com,
	baolu.lu@linux.intel.com, john.garry@huawei.com,
	dianders@chromium.org,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Yong Wu <yong.wu@mediatek.com>,
	Chunyan Zhang <chunyan.zhang@unisoc.com>,
	Maxime Ripard <mripard@kernel.org>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>
Subject: Re: [PATCH v2 00/24] iommu: Refactor DMA domain strictness
Date: Thu, 29 Jul 2021 17:29:24 +0100	[thread overview]
Message-ID: <ca9c5667-8f60-0d1c-6bca-323382e7a391@arm.com> (raw)
In-Reply-To: <2152676.3VsfAaAtOV@diego>

On 2021-07-29 16:53, Heiko Stübner wrote:
> Am Donnerstag, 29. Juli 2021, 17:43:07 CEST schrieb Robin Murphy:
>> On 2021-07-29 16:04, Heiko Stübner wrote:
>>> Hi Robin,
>>>
>>> Am Mittwoch, 28. Juli 2021, 17:58:21 CEST schrieb Robin Murphy:
>>>> Hi all,
>>>>
>>>> Here's v2 where things start to look more realistic, hence the expanded
>>>> CC list. The patches are now based on the current iommu/core branch to
>>>> take John's iommu_set_dma_strict() cleanup into account.
>>>>
>>>> The series remiains in two (or possibly 3) logical parts - for people
>>>> CC'd on cookie cleanup patches, the later parts should not affect you
>>>> since your drivers don't implement non-strict mode anyway; the cleanup
>>>> is all pretty straightforward, but please do yell at me if I've managed
>>>> to let a silly mistake slip through and broken your driver.
>>>>
>>>> This time I have also build-tested x86 as well as arm64 :)
>>>
>>> TL;DR: arm64 yay, arm32 nay ;-)
>>
>> Cheers Heiko!
>>
>>> testcase:
>>> 5.14-rc3
>>> + iommu/next
>>> + patches 1+8 (the ones you cc'd me on)
>>>     iommu: Pull IOVA cookie management into the core
>>>     iommu/rockchip: Drop IOVA cookie management
>>>
>>> rk3399+hdmi (puma): boots with graphics
>>> rk3399+edp (kevin): boots with graphics
>>> px30+dsi (minievb): boots with graphics
>>>
>>> rk3288 (arm32, veyron-pinky): hangs when trying to start the rockchip-drm
>>> at some points the rest of the system recovers and fills the log with
>>>
>>> [   47.193776] [drm:drm_crtc_commit_wait] *ERROR* flip_done timed out
>>> [   47.193867] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:31:plane-0] commit wait timed out
>>> [   57.433743] [drm:drm_crtc_commit_wait] *ERROR* flip_done timed out
>>> [   57.433828] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:40:plane-4] commit wait timed out
>>>
>>> spews
>>>
>>> testcase 2:
>>> 5.14-rc3
>>> + iommu/next
>>>
>>> all works fine on both arm32+arm64
>>>
>>>
>>> That whole iommu voodoo is a bit over my head right now, so I'm not sure
>>> what to poke to diagnose this.
>>
>> Dang, this wasn't supposed to affect 32-bit Arm at all, since that
>> doesn't touch any of the default domain stuff either way. I have both my
>> RK3288 box (which IIRC doesn't currently boot) and an Odroid-U3 in the
>> "desk pile" right in front of me, so at worst I'll try bringing one of
>> those to life to see what silly thing I have indeed done to break 32-bit.
>>
>> I have a vague idea forming already, which suggests that it might get
>> better again once patch #12 is applied, but even if so there's no excuse
>> not to be bisectable, so I need to dig in and fix it - many thanks for
>> yelling as requested :D
> 
> That vague idea was actually quite correct, applying
> 	iommu/dma: Unexport IOVA cookie management
> on top of the the two patches makes my rk3288 boot correctly again
> and the display also works again.

Yup, since the !CONFIG_IOMMU_DMA stub for iommu_get_dma_cookie() returns 
-ENODEV, rather than the -ENOMEM that the temporary special case is 
expecting from the real function, it will inadvertently allow the 
default domain to be created (when it wasn't before). I still have no 
idea why that causes a problem though, since arm_iommu_attach_device() 
should end up kicking a default domain out of the way even if one does 
exist... :/

Either way I'll fix my bug - indeed it was an oversight that I hadn't 
considered which exact error code the stub "fails" with - to avoid the 
temporary change in behaviour, but I'll have to keep digging into the 
arch/arm code and rockchip-iommu to see if something's also off there.

Cheers,
Robin.

  reply	other threads:[~2021-07-29 16:29 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-28 15:58 Robin Murphy
2021-07-28 15:58 ` [PATCH v2 01/24] iommu: Pull IOVA cookie management into the core Robin Murphy
2021-07-30  6:06   ` Lu Baolu
2021-07-30  9:32   ` Jean-Philippe Brucker
2021-07-28 15:58 ` [PATCH v2 02/24] iommu/amd: Drop IOVA cookie management Robin Murphy
2021-07-28 15:58 ` [PATCH v2 03/24] iommu/arm-smmu: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 04/24] iommu/vt-d: " Robin Murphy
2021-07-30  6:07   ` Lu Baolu
2021-07-28 15:58 ` [PATCH v2 05/24] iommu/exynos: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 06/24] iommu/ipmmu-vmsa: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 07/24] iommu/mtk: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 08/24] iommu/rockchip: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 09/24] iommu/sprd: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 10/24] iommu/sun50i: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 11/24] iommu/virtio: " Robin Murphy
2021-07-30  9:20   ` Jean-Philippe Brucker
2021-07-28 15:58 ` [PATCH v2 12/24] iommu/dma: Unexport " Robin Murphy
2021-07-30  6:07   ` Lu Baolu
2021-07-30  9:21   ` Jean-Philippe Brucker
2021-07-28 15:58 ` [PATCH v2 13/24] iommu/dma: Remove redundant "!dev" checks Robin Murphy
2021-07-30  6:08   ` Lu Baolu
2021-07-28 15:58 ` [PATCH v2 14/24] iommu: Introduce explicit type for non-strict DMA domains Robin Murphy
2021-07-30  6:08   ` Lu Baolu
2021-07-30  9:23   ` Jean-Philippe Brucker
2021-07-28 15:58 ` [PATCH v2 15/24] iommu/amd: Prepare for multiple DMA domain types Robin Murphy
2021-07-28 15:58 ` [PATCH v2 16/24] iommu/arm-smmu: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 17/24] iommu/vt-d: " Robin Murphy
2021-07-30  6:09   ` Lu Baolu
2021-07-28 15:58 ` [PATCH v2 18/24] iommu: Express DMA strictness via the domain type Robin Murphy
2021-07-29  7:13   ` Lu Baolu
2021-07-29  9:36     ` Robin Murphy
2021-07-29 12:42       ` Lu Baolu
2021-07-30  6:09       ` Lu Baolu
2021-07-28 15:58 ` [PATCH v2 19/24] iommu: Expose DMA domain strictness via sysfs Robin Murphy
2021-07-30  6:10   ` Lu Baolu
2021-07-30  9:28   ` Jean-Philippe Brucker
2021-07-30 10:20   ` John Garry
2021-07-28 15:58 ` [PATCH v2 20/24] iommu: Merge strictness and domain type configs Robin Murphy
2021-07-30  6:10   ` Lu Baolu
2021-07-30  9:29   ` Jean-Philippe Brucker
2021-07-30  9:33   ` John Garry
2021-07-28 15:58 ` [PATCH v2 21/24] iommu/dma: Factor out flush queue init Robin Murphy
2021-07-30  6:11   ` Lu Baolu
2021-07-30  9:20   ` John Garry
2021-07-28 15:58 ` [PATCH v2 22/24] iommu: Allow enabling non-strict mode dynamically Robin Murphy
2021-07-30  6:11   ` Lu Baolu
2021-07-30  9:24   ` John Garry
2021-07-28 15:58 ` [PATCH v2 23/24] iommu/arm-smmu: Allow non-strict in pgtable_quirks interface Robin Murphy
2021-08-02 13:04   ` Will Deacon
2021-08-02 14:15     ` Robin Murphy
2021-08-03 10:36       ` Will Deacon
2021-08-03 12:13         ` Robin Murphy
2021-08-03 12:35           ` Will Deacon
2021-07-28 15:58 ` [PATCH v2 24/24] iommu: Only log strictness for DMA domains Robin Murphy
2021-07-29  9:04   ` John Garry
2021-07-30  6:12   ` Lu Baolu
2021-07-29  2:55 ` [PATCH v2 00/24] iommu: Refactor DMA domain strictness chenxiang (M)
2021-07-29 10:59   ` Robin Murphy
2021-07-30  1:21     ` chenxiang (M)
2021-07-29 15:04 ` Heiko Stübner
2021-07-29 15:43   ` Robin Murphy
2021-07-29 15:53     ` Heiko Stübner
2021-07-29 16:29       ` Robin Murphy [this message]
2021-07-29 22:33 ` Doug Anderson
2021-07-30  0:06   ` Doug Anderson

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