From: Yong Wu <yong.wu@mediatek.com>
To: Tomasz Figa <tfiga@chromium.org>
Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org,
Nicolas Boichat <drinkcat@chromium.org>,
srv_heupstream@mediatek.com, Tomasz Figa <tfiga@google.com>,
Will Deacon <will@kernel.org>,
linux-kernel@vger.kernel.org, Evan Green <evgreen@chromium.org>,
chao.hao@mediatek.com, iommu@lists.linux-foundation.org,
Rob Herring <robh+dt@kernel.org>,
linux-mediatek@lists.infradead.org,
Krzysztof Kozlowski <krzk@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
anan.sun@mediatek.com, Robin Murphy <robin.murphy@arm.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v5 17/27] iommu/mediatek: Add pm runtime callback
Date: Tue, 29 Dec 2020 19:06:00 +0800 [thread overview]
Message-ID: <1609239960.26323.291.camel@mhfsdcap03> (raw)
In-Reply-To: <X+MAh87dFsY2p8vF@chromium.org>
On Wed, 2020-12-23 at 17:32 +0900, Tomasz Figa wrote:
> On Wed, Dec 09, 2020 at 04:00:52PM +0800, Yong Wu wrote:
> > This patch adds pm runtime callback.
> >
> > In pm runtime case, all the registers backup/restore and bclk are
> > controlled in the pm_runtime callback, then pm_suspend is not needed in
> > this case.
> >
> > runtime PM is disabled when suspend, thus we call
> > pm_runtime_status_suspended instead of pm_runtime_suspended.
> >
> > And, m4u doesn't have its special pm runtime domain in previous SoC, in
> > this case dev->power.runtime_status is RPM_SUSPENDED defaultly,
>
> This sounds wrong and could lead to hard to debug errors when the driver
> is changed in the future. Would it be possible to make the behavior
> consistent across the SoCs instead, so that runtime PM status is ACTIVE
> when needed, even on SoCs without an IOMMU PM domain?
Appreciate the reviewing so detailly.
I have tested this.
a) always call pm_runtime_enable.
b) always add device_link with smi_common.
Then, the runtime PM status meet expectation.
We don't call pm_runtime_get_sync so often, thus, we don't always touch
dev->power.lock. this is ok for us.
I will use this in the next version.
>
> > thus add
> > a "dev->pm_domain" checking for the SoC that has pm runtime domain.
> >
> > Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> > ---
> > drivers/iommu/mtk_iommu.c | 22 ++++++++++++++++++++--
> > 1 file changed, 20 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> > index 5614015e5b96..6fe3ee2b2bf5 100644
> > --- a/drivers/iommu/mtk_iommu.c
> > +++ b/drivers/iommu/mtk_iommu.c
> > @@ -808,7 +808,7 @@ static int mtk_iommu_remove(struct platform_device *pdev)
> > return 0;
> > }
> >
> > -static int __maybe_unused mtk_iommu_suspend(struct device *dev)
> > +static int __maybe_unused mtk_iommu_runtime_suspend(struct device *dev)
> > {
> > struct mtk_iommu_data *data = dev_get_drvdata(dev);
> > struct mtk_iommu_suspend_reg *reg = &data->reg;
> > @@ -826,7 +826,7 @@ static int __maybe_unused mtk_iommu_suspend(struct device *dev)
> > return 0;
> > }
> >
> > -static int __maybe_unused mtk_iommu_resume(struct device *dev)
> > +static int __maybe_unused mtk_iommu_runtime_resume(struct device *dev)
> > {
> > struct mtk_iommu_data *data = dev_get_drvdata(dev);
> > struct mtk_iommu_suspend_reg *reg = &data->reg;
> > @@ -853,7 +853,25 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
> > return 0;
> > }
> >
> > +static int __maybe_unused mtk_iommu_suspend(struct device *dev)
> > +{
> > + /* runtime PM is disabled when suspend in pm_runtime case. */
> > + if (dev->pm_domain && pm_runtime_status_suspended(dev))
> > + return 0;
> > +
> > + return mtk_iommu_runtime_suspend(dev);
> > +}
> > +
> > +static int __maybe_unused mtk_iommu_resume(struct device *dev)
> > +{
> > + if (dev->pm_domain && pm_runtime_status_suspended(dev))
> > + return 0;
> > +
> > + return mtk_iommu_runtime_resume(dev);
> > +}
>
> Wouldn't it be enough to just use pm_runtime_force_suspend() and
> pm_runtime_force_resume() as system sleep ops?
After above solution, this is ok.
Thanks.
>
> > +
> > static const struct dev_pm_ops mtk_iommu_pm_ops = {
> > + SET_RUNTIME_PM_OPS(mtk_iommu_runtime_suspend, mtk_iommu_runtime_resume, NULL)
> > SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
> > };
> >
> > --
> > 2.18.0
> >
> > _______________________________________________
> > iommu mailing list
> > iommu@lists.linux-foundation.org
> > https://lists.linuxfoundation.org/mailman/listinfo/iommu
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-12-29 11:06 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-09 8:00 [PATCH v5 00/27] MT8192 IOMMU support Yong Wu
2020-12-09 8:00 ` [PATCH v5 01/27] dt-bindings: iommu: mediatek: Convert IOMMU to DT schema Yong Wu
2020-12-09 8:00 ` [PATCH v5 02/27] dt-bindings: memory: mediatek: Add a common larb-port header file Yong Wu
2020-12-09 8:00 ` [PATCH v5 03/27] dt-bindings: memory: mediatek: Extend LARB_NR_MAX to 32 Yong Wu
2020-12-09 8:00 ` [PATCH v5 04/27] dt-bindings: memory: mediatek: Add domain definition Yong Wu
2020-12-23 8:15 ` Tomasz Figa
2020-12-24 11:26 ` Yong Wu
2021-01-13 5:22 ` Tomasz Figa
2020-12-09 8:00 ` [PATCH v5 05/27] dt-bindings: memory: mediatek: Rename header guard for SMI header file Yong Wu
2020-12-09 12:12 ` Krzysztof Kozlowski
2020-12-11 3:26 ` Rob Herring
2020-12-09 8:00 ` [PATCH v5 06/27] dt-bindings: mediatek: Add binding for mt8192 IOMMU Yong Wu
2020-12-09 12:13 ` Krzysztof Kozlowski
2020-12-23 8:18 ` Tomasz Figa
2020-12-24 11:35 ` Yong Wu
2021-01-13 5:30 ` Tomasz Figa
2021-01-13 6:45 ` Yong Wu
2021-01-20 4:15 ` Tomasz Figa
2021-01-20 7:07 ` Yong Wu
2021-01-25 4:18 ` Tomasz Figa
2021-01-25 7:33 ` Yong Wu
2021-01-29 11:45 ` Tomasz Figa
2021-02-01 5:36 ` Yong Wu
2021-02-01 10:44 ` Robin Murphy
2020-12-09 8:00 ` [PATCH v5 07/27] iommu/mediatek: Use the common mtk-smi-larb-port.h Yong Wu
2020-12-09 8:00 ` [PATCH v5 08/27] iommu/io-pgtable-arm-v7s: Use ias to check the valid iova in unmap Yong Wu
2020-12-09 8:00 ` [PATCH v5 09/27] iommu/io-pgtable-arm-v7s: Extend PA34 for MediaTek Yong Wu
2020-12-23 8:20 ` Tomasz Figa
2020-12-29 11:17 ` Yong Wu
2020-12-09 8:00 ` [PATCH v5 10/27] iommu/io-pgtable-arm-v7s: Clarify LVL_SHIFT/BITS macro Yong Wu
2020-12-09 8:00 ` [PATCH v5 11/27] iommu/io-pgtable-arm-v7s: Add cfg as a param in some macros Yong Wu
2020-12-09 8:00 ` [PATCH v5 12/27] iommu/io-pgtable-arm-v7s: Quad lvl1 pgtable for MediaTek Yong Wu
2020-12-09 8:00 ` [PATCH v5 13/27] iommu/mediatek: Add a flag for iova_34 bit case Yong Wu
2020-12-09 8:00 ` [PATCH v5 14/27] iommu/mediatek: Move hw_init into attach_device Yong Wu
2020-12-09 8:00 ` [PATCH v5 15/27] iommu/mediatek: Add fail handle for sysfs_add and device_register Yong Wu
2020-12-23 8:25 ` Tomasz Figa
2020-12-29 11:00 ` Yong Wu
2020-12-09 8:00 ` [PATCH v5 16/27] iommu/mediatek: Add device link for smi-common and m4u Yong Wu
2020-12-23 8:29 ` Tomasz Figa
2020-12-29 11:25 ` Yong Wu
2020-12-09 8:00 ` [PATCH v5 17/27] iommu/mediatek: Add pm runtime callback Yong Wu
2020-12-23 8:32 ` Tomasz Figa
2020-12-29 11:06 ` Yong Wu [this message]
2020-12-09 8:00 ` [PATCH v5 18/27] iommu/mediatek: Add power-domain operation Yong Wu
2020-12-23 8:36 ` Tomasz Figa
2020-12-29 11:06 ` Yong Wu
2021-01-08 9:54 ` Tomasz Figa
2020-12-09 8:00 ` [PATCH v5 19/27] iommu/mediatek: Add iova reserved function Yong Wu
2020-12-09 8:00 ` [PATCH v5 20/27] iommu/mediatek: Add single domain Yong Wu
2020-12-09 8:00 ` [PATCH v5 21/27] iommu/mediatek: Support master use iova over 32bit Yong Wu
2020-12-09 8:00 ` [PATCH v5 22/27] iommu/mediatek: Support up to 34bit iova in tlb flush Yong Wu
2020-12-09 8:00 ` [PATCH v5 23/27] iommu/mediatek: Support report iova 34bit translation fault in ISR Yong Wu
2020-12-09 8:00 ` [PATCH v5 24/27] iommu/mediatek: Add support for multi domain Yong Wu
2020-12-09 8:01 ` [PATCH v5 25/27] iommu/mediatek: Adjust the structure Yong Wu
2020-12-09 8:01 ` [PATCH v5 26/27] iommu/mediatek: Add mt8192 support Yong Wu
2020-12-09 8:01 ` [PATCH v5 27/27] MAINTAINERS: Add entry for MediaTek IOMMU Yong Wu
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