From: tjakobi@math•uni-bielefeld.de (Tobias Jakobi)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2 00/10] Exynos IOMMU: proper runtime PM support (use device dependencies)
Date: Fri, 15 Jul 2016 15:21:22 +0200 [thread overview]
Message-ID: <5788E352.3040801@math.uni-bielefeld.de> (raw)
In-Reply-To: <5787B2B0.9020809@math.uni-bielefeld.de>
Tobias Jakobi wrote:
> Hello Marek,
>
> I've tested the patchset on 4.7-rc7 and noticed that it breaks reboot on
> my ODROID-X2.
>
> Going to check where exactly things break.
Sadly it's the last patch where everything comes together:
"iommu/exynos: Add proper runtime pm support"
I still have to check if forcing runpm status to 'on' makes a
difference. I suspect that the aggressive clock gating might be the reason?
With best wishes,
Tobias
> With best wishes,
> Tobias
>
>
> Marek Szyprowski wrote:
>> Hello,
>>
>> This patch series finally implements proper runtime PM support in Exynos
>> IOMMU driver. This has been achieved by using device links, which lets
>> SYSMMU controller's runtime PM to follow master's device runtime PM (the
>> device which actually performs DMA transaction). The main idea
>> behind this solution is an observation that any DMA activity from master
>> device can be done only when master device is active, thus when master
>> device is suspended SYSMMU controller device can also be suspended.
>>
>> This patchset solves the situation that power domains are always enabled,
>> because all SYSMMU controllers (which belongs to those domains) are
>> permanently active (because existing driver was simplified and kept
>> SYSMMU device active all the time after initialization).
>>
>> Patches 1-5 are resend of the "[RFC][PATCH 0/5] Functional dependencies
>> between devices" patchset:
>> http://thread.gmane.org/gmane.linux.power-management.general/67424/focus=2126379
>> I've included them here, because it is hard to find them all on mailing
>> list archives.
>>
>> Patches 6-8 are fixes to device dependencies/links code, which were
>> required to use this solution for Exynos IOMMU driver. I'm not PM/runtime
>> PM code expert, so please double check if my changes are really correct.
>>
>> This patchset requires my previous changes to Exynos IOMMU driver
>> submitted in the "Exynos IOMMU: improve clock management" thread:
>> http://www.spinics.net/lists/arm-kernel/msg505695.html
>>
>> Best regards
>> Marek Szyprowski
>> Samsung R&D Institute Poland
>>
>>
>> Changelog:
>> v2:
>> - replaced PM notifiers with generic device dependencies/links developped
>> by Rafael J. Wysocki
>>
>> v1: http://www.spinics.net/lists/arm-kernel/msg509600.html
>> - initial version
>>
>>
>> Patch summary:
>>
>> Marek Szyprowski (5):
>> driver core: Avoid endless recursion if device has more than one link
>> driver core: Add support for links to already probed drivers
>> PM core: Fix restoring devices with links during system PM transition
>> iommu/exynos: Remove excessive, useless debug
>> iommu/exynos: Add proper runtime pm support
>>
>> Rafael J. Wysocki (5):
>> driver core: Add a wrapper around __device_release_driver()
>> driver core: Functional dependencies tracking support
>> PM core: Make async suspend/resume of devices use device links
>> PM core: Make runtime PM of devices use device links
>> PM core: Optimize the use of device links for runtime PM
>>
>> drivers/base/base.h | 13 ++
>> drivers/base/core.c | 410 +++++++++++++++++++++++++++++++++++++++++++
>> drivers/base/dd.c | 65 +++++--
>> drivers/base/power/main.c | 68 ++++++-
>> drivers/base/power/runtime.c | 130 +++++++++++++-
>> drivers/iommu/exynos-iommu.c | 221 +++++++++++------------
>> include/linux/device.h | 41 +++++
>> include/linux/pm.h | 1 +
>> include/linux/pm_runtime.h | 6 +
>> 9 files changed, 809 insertions(+), 146 deletions(-)
>>
>
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next prev parent reply other threads:[~2016-07-15 13:21 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-17 6:26 [PATCH v2 00/10] Exynos IOMMU: proper runtime PM support (use device dependencies) Marek Szyprowski
2016-06-17 6:26 ` [PATCH v2 01/10] driver core: Add a wrapper around __device_release_driver() Marek Szyprowski
2016-06-17 6:26 ` [PATCH v2 02/10] driver core: Functional dependencies tracking support Marek Szyprowski
2016-06-17 10:36 ` Lukas Wunner
2016-06-17 12:54 ` Rafael J. Wysocki
2016-06-17 14:07 ` Lukas Wunner
2016-07-20 0:33 ` Rafael J. Wysocki
2016-07-20 6:24 ` Lukas Wunner
2016-07-20 12:52 ` Rafael J. Wysocki
2016-07-20 15:23 ` Lukas Wunner
2016-07-20 22:51 ` Rafael J. Wysocki
2016-07-20 23:25 ` Lukas Wunner
2016-07-21 0:25 ` Rafael J. Wysocki
2016-07-24 22:48 ` Lukas Wunner
2016-07-28 0:30 ` Rafael J. Wysocki
2016-07-28 15:28 ` Lukas Wunner
2016-09-06 23:57 ` Rafael J. Wysocki
2016-06-17 6:26 ` [PATCH v2 03/10] PM core: Make async suspend/resume of devices use device links Marek Szyprowski
2016-06-17 6:26 ` [PATCH v2 04/10] PM core: Make runtime PM " Marek Szyprowski
2016-06-17 6:26 ` [PATCH v2 05/10] PM core: Optimize the use of device links for runtime PM Marek Szyprowski
2016-06-17 6:26 ` [PATCH v2 06/10] driver core: Avoid endless recursion if device has more than one link Marek Szyprowski
2016-09-06 23:09 ` Rafael J. Wysocki
2016-06-17 6:26 ` [PATCH v2 07/10] driver core: Add support for links to already probed drivers Marek Szyprowski
2016-09-06 23:13 ` Rafael J. Wysocki
2016-06-17 6:26 ` [PATCH v2 08/10] PM core: Fix restoring devices with links during system PM transition Marek Szyprowski
2016-09-06 23:24 ` Rafael J. Wysocki
2016-06-17 6:26 ` [PATCH v2 09/10] iommu/exynos: Remove excessive, useless debug Marek Szyprowski
2016-06-17 6:27 ` [PATCH v2 10/10] iommu/exynos: Add proper runtime pm support Marek Szyprowski
2016-07-14 15:41 ` [PATCH v2 00/10] Exynos IOMMU: proper runtime PM support (use device dependencies) Tobias Jakobi
2016-07-15 13:21 ` Tobias Jakobi [this message]
2016-07-18 10:32 ` Marek Szyprowski
2016-07-18 11:00 ` Tobias Jakobi
2016-07-18 13:50 ` Marek Szyprowski
2016-07-18 16:43 ` Tobias Jakobi
2016-07-19 6:26 ` Marek Szyprowski
2016-07-24 18:02 ` Tobias Jakobi
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