From: Tomasz Figa <tfiga@chromium.org>
To: Vivek Gautam <vivek.gautam@codeaurora.org>
Cc: "list@263.net:IOMMU DRIVERS <iommu@lists.linux-foundation.org>,
Joerg Roedel <joro@8bytes.org>," <joro@8bytes.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Robin Murphy <robin.murphy@arm.com>,
Will Deacon <will.deacon@arm.com>,
Rob Clark <robdclark@gmail.com>"list@263.net:IOMMU DRIVERS
<iommu@lists.linux-foundation.org>,
Joerg Roedel <joro@8bytes.org>,"
<iommu@lists.linux-foundation.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org,
dri-devel <dri-devel@lists.freedesktop.org>,
freedreno@lists.freedesktop.org, David Airlie <airlied@linux.ie>,
Greg KH <gregkh@linuxfoundation.org>,
sboyd@codeaurora.org, linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH v7 1/6] base: power: runtime: Export pm_runtime_get/put_suppliers
Date: Tue, 13 Feb 2018 16:44:37 +0900 [thread overview]
Message-ID: <CAAFQd5BmroRf-C8dQkvTKHWK1psGnNi1t7g-q=Xce6KjrGTsdw@mail.gmail.com> (raw)
In-Reply-To: <1517999482-17317-2-git-send-email-vivek.gautam@codeaurora.org>
Hi Vivek,
On Wed, Feb 7, 2018 at 7:31 PM, Vivek Gautam
<vivek.gautam@codeaurora.org> wrote:
> The device link allows the pm framework to tie the supplier and
> consumer. So, whenever the consumer is powered-on the supplier
> is powered-on first.
>
> There are however cases in which the consumer wants to power-on
> the supplier, but not itself.
> E.g., A Graphics or multimedia driver wants to power-on the SMMU
> to unmap a buffer and finish the TLB operations without powering
> on itself.
This sounds strange to me. If the SMMU is powered down, wouldn't the
TLB lose its contents as well (and so no flushing needed)?
Other than that, what kind of hardware operations would be needed
besides just updating the page tables from the CPU?
Best regards,
Tomasz
WARNING: multiple messages have this Message-ID (diff)
From: Tomasz Figa <tfiga@chromium.org>
To: Vivek Gautam <vivek.gautam@codeaurora.org>
Cc: "list@263.net:IOMMU DRIVERS <iommu@lists.linux-foundation.org>,
Joerg Roedel <joro@8bytes.org>," <joro@8bytes.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Robin Murphy <robin.murphy@arm.com>,
Will Deacon <will.deacon@arm.com>,
Rob Clark <robdclark@gmail.com>,
"list@263.net:IOMMU DRIVERS <iommu@lists.linux-foundation.org>,
Joerg Roedel <joro@8bytes.org>,"
<iommu@lists.linux-foundation.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org,
dri-devel <dri-devel@lists.freedesktop.org>,
freedreno@lists.freedesktop.org, David Airlie <airlied@linux.ie>,
Greg KH <gregkh@linuxfoundation.org>,
sboyd@codeaurora.org, linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH v7 1/6] base: power: runtime: Export pm_runtime_get/put_suppliers
Date: Tue, 13 Feb 2018 16:44:37 +0900 [thread overview]
Message-ID: <CAAFQd5BmroRf-C8dQkvTKHWK1psGnNi1t7g-q=Xce6KjrGTsdw@mail.gmail.com> (raw)
In-Reply-To: <1517999482-17317-2-git-send-email-vivek.gautam@codeaurora.org>
Hi Vivek,
On Wed, Feb 7, 2018 at 7:31 PM, Vivek Gautam
<vivek.gautam@codeaurora.org> wrote:
> The device link allows the pm framework to tie the supplier and
> consumer. So, whenever the consumer is powered-on the supplier
> is powered-on first.
>
> There are however cases in which the consumer wants to power-on
> the supplier, but not itself.
> E.g., A Graphics or multimedia driver wants to power-on the SMMU
> to unmap a buffer and finish the TLB operations without powering
> on itself.
This sounds strange to me. If the SMMU is powered down, wouldn't the
TLB lose its contents as well (and so no flushing needed)?
Other than that, what kind of hardware operations would be needed
besides just updating the page tables from the CPU?
Best regards,
Tomasz
next prev parent reply other threads:[~2018-02-13 7:45 UTC|newest]
Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-07 10:31 [PATCH v7 0/6] iommu/arm-smmu: Add runtime pm/sleep support Vivek Gautam
2018-02-07 10:31 ` Vivek Gautam
[not found] ` <1517999482-17317-1-git-send-email-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-02-07 10:31 ` [PATCH v7 1/6] base: power: runtime: Export pm_runtime_get/put_suppliers Vivek Gautam
2018-02-07 10:31 ` Vivek Gautam
2018-02-13 7:44 ` Tomasz Figa [this message]
2018-02-13 7:44 ` Tomasz Figa
[not found] ` <CAAFQd5BmroRf-C8dQkvTKHWK1psGnNi1t7g-q=Xce6KjrGTsdw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-13 12:00 ` Robin Murphy
2018-02-13 12:00 ` Robin Murphy
2018-02-13 12:54 ` Tomasz Figa
2018-02-13 12:54 ` Tomasz Figa
2018-02-13 13:37 ` Robin Murphy
2018-02-13 13:37 ` Robin Murphy
2018-02-07 10:31 ` [PATCH v7 2/6] iommu/arm-smmu: Add pm_runtime/sleep ops Vivek Gautam
2018-02-07 10:31 ` Vivek Gautam
2018-02-13 8:03 ` Tomasz Figa
2018-02-13 8:03 ` Tomasz Figa
[not found] ` <CAAFQd5B2u8RL-tdB3qgPxVUcXnsBSEhXRBZWxqO-w6rYKAiOtg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-13 10:25 ` Vivek Gautam
2018-02-13 10:25 ` Vivek Gautam
2018-02-14 3:45 ` Tomasz Figa
2018-02-14 3:45 ` Tomasz Figa
2018-02-07 10:31 ` [PATCH v7 3/6] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device Vivek Gautam
2018-02-07 10:31 ` Vivek Gautam
2018-02-13 8:24 ` Tomasz Figa
2018-02-13 8:24 ` Tomasz Figa
[not found] ` <CAAFQd5DxYhkK61VDAesby6bT+FtG2nqsbHQRvxkhrsSS0KWtog-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-13 12:57 ` Robin Murphy
2018-02-13 12:57 ` Robin Murphy
[not found] ` <906051dd-8898-ec6f-5ad4-3f37716292cf-5wv7dgnIgG8@public.gmane.org>
2018-02-13 13:52 ` Tomasz Figa
2018-02-13 13:52 ` Tomasz Figa
[not found] ` <CAAFQd5DJtQYPg5S3Ep2bK27+D5rQiKuA-uPfMDUon3FudmGF0w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-14 8:24 ` Vivek Gautam
2018-02-14 8:24 ` Vivek Gautam
2018-02-14 8:28 ` Vivek Gautam
2018-02-14 8:28 ` Vivek Gautam
[not found] ` <1517999482-17317-4-git-send-email-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-02-22 23:52 ` Jordan Crouse
2018-02-22 23:52 ` Jordan Crouse
[not found] ` <20180222235200.GA18743-9PYrDHPZ2Orvke4nUoYGnHL1okKdlPRT@public.gmane.org>
2018-02-23 10:36 ` Vivek Gautam
2018-02-23 10:36 ` Vivek Gautam
[not found] ` <CAFp+6iGQ5Vckui14Jb=V0uk_Pjes95hOxo=KBijR4yxPeDDzFg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-23 15:40 ` [Freedreno] " Jordan Crouse
2018-02-23 15:40 ` Jordan Crouse
[not found] ` <20180223154048.GB18743-9PYrDHPZ2Orvke4nUoYGnHL1okKdlPRT@public.gmane.org>
2018-02-23 17:43 ` Vivek Gautam
2018-02-23 17:43 ` [Freedreno] " Vivek Gautam
2018-02-07 10:31 ` [PATCH v7 4/6] iommu/arm-smmu: Add the device_link between masters and smmu Vivek Gautam
2018-02-07 10:31 ` Vivek Gautam
2018-02-13 8:31 ` Tomasz Figa
2018-02-13 8:31 ` Tomasz Figa
[not found] ` <CAAFQd5BQAs9=N27_Z0pJNSrndFY3vFin2KBP44UtiW+tMXy5nQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-13 10:14 ` Vivek Gautam
2018-02-13 10:14 ` Vivek Gautam
2018-02-07 10:31 ` [PATCH v7 5/6] iommu/arm-smmu: Add support for qcom, smmu-v2 variant Vivek Gautam
2018-02-07 10:31 ` [PATCH v7 5/6] iommu/arm-smmu: Add support for qcom,smmu-v2 variant Vivek Gautam
2018-02-09 10:57 ` [PATCH v8 " Vivek Gautam
2018-02-13 8:57 ` Tomasz Figa
2018-02-13 8:57 ` Tomasz Figa
2018-02-07 10:31 ` [PATCH v7 6/6] drm/msm: iommu: Replace runtime calls with runtime suppliers Vivek Gautam
2018-02-07 10:31 ` Vivek Gautam
2018-02-13 9:10 ` Tomasz Figa
2018-02-13 9:10 ` Tomasz Figa
[not found] ` <CAAFQd5AjopiX6fDgD+mO+-+d0yj-swEnVCNvccWRBSMO+XVJkA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-13 16:42 ` Jordan Crouse
2018-02-13 16:42 ` Jordan Crouse
2018-02-14 3:31 ` Tomasz Figa
[not found] ` <CAAFQd5CjQRFATfh-mRQv5J=WefYuxBVTkk=Ju09FoqA-Or5Cvg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-14 15:48 ` Jordan Crouse
2018-02-14 15:48 ` Jordan Crouse
[not found] ` <20180214154850.GA25422-9PYrDHPZ2Orvke4nUoYGnHL1okKdlPRT@public.gmane.org>
2018-02-14 16:12 ` [Freedreno] " Rob Clark
2018-02-14 16:12 ` Rob Clark
2018-02-15 4:09 ` Tomasz Figa
2018-02-15 4:09 ` Tomasz Figa
[not found] ` <CAAFQd5C-9mbd3hDSvz10a1oiO0--FT-L4EpsAYcALxxUvk6Fjg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-15 14:14 ` Rob Clark
2018-02-15 14:14 ` [Freedreno] " Rob Clark
2018-02-13 18:03 ` Rob Clark
2018-02-13 18:03 ` Rob Clark
2018-02-14 1:59 ` Tomasz Figa
2018-02-14 1:59 ` Tomasz Figa
[not found] ` <CAAFQd5BKRumpEfAKNF_RKS-ZZ8D671DfOz4vB2+w1SV3aG9NxQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-14 2:13 ` Rob Clark
2018-02-14 2:13 ` Rob Clark
[not found] ` <CAF6AEGuNZJKtwGZ5mLfqNND2jtU+HYM11UONfAtVTzoM0QVpdg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-14 3:01 ` Tomasz Figa
2018-02-14 3:01 ` Tomasz Figa
[not found] ` <CAAFQd5BZJ1G0RG32hYErNzPRvisBhhiSNCBsjbzfm0WzO=DnsQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-14 4:17 ` Vivek Gautam
2018-02-14 4:17 ` Vivek Gautam
[not found] ` <CAFp+6iHaycK=CcE1S15EeuMkaw8LnW0ebptU0hM6tUtWdeEOtA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-14 5:38 ` Tomasz Figa
2018-02-14 5:38 ` Tomasz Figa
[not found] ` <CAAFQd5Afj-Bj+3wHwmF2tT7y=46EsYEtO_mXfY6stXBgHutEUg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-14 9:13 ` Vivek Gautam
2018-02-14 9:13 ` Vivek Gautam
[not found] ` <CAFp+6iGX6pr+MdPSSHHG=qOnhHky_8OHiDqAcJ9UudEUv=JMHg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-14 9:16 ` Tomasz Figa
2018-02-14 9:16 ` Tomasz Figa
[not found] ` <CAAFQd5DiwAugGnPOTw0+XrEfef9x-n-vx59JFuXpNawjiXHwCw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-14 10:33 ` Vivek Gautam
2018-02-14 10:33 ` Vivek Gautam
[not found] ` <CAFp+6iEW0faeHDfzN_F1bRrHGcVo3sPCk4HSY=t9dnEvHkDkYw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-14 16:03 ` Robin Murphy
2018-02-14 16:03 ` Robin Murphy
2018-02-15 3:17 ` Tomasz Figa
[not found] ` <CAAFQd5AmG1zSm+CouXOCJbs8SNGFk1-RqfU1nWGjMGJMB-qfvw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-15 4:17 ` Tomasz Figa
2018-02-15 4:17 ` Tomasz Figa
[not found] ` <CAAFQd5A9B-di9svtiJbvk2hz1U1xo61rTY5vt6AD+KR5iMcG-A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-15 17:14 ` Robin Murphy
2018-02-15 17:14 ` Robin Murphy
[not found] ` <7406f1ce-c2c9-a6bd-2886-5a34de45add6-5wv7dgnIgG8@public.gmane.org>
2018-02-16 0:13 ` Tomasz Figa
2018-02-16 0:13 ` Tomasz Figa
[not found] ` <CAAFQd5DkLtq2w00=Zd4sMDB4QOWqi7R-zgydECJXLdTmaHty+g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-22 8:13 ` Tomasz Figa
2018-02-22 8:13 ` Tomasz Figa
[not found] ` <CAAFQd5CQoDqunAunwoVo7W=QXa=ET=eJ2s_j9j+3YgAR2EGgCg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-22 13:30 ` Rob Clark
2018-02-22 13:30 ` [Freedreno] " Rob Clark
2018-02-22 13:45 ` Robin Murphy
2018-02-22 13:45 ` Robin Murphy
2018-02-22 14:12 ` Tomasz Figa
2018-02-22 14:12 ` Tomasz Figa
[not found] ` <CAAFQd5CzOJ0oS8LLcKP-DgyXSXgzafg5CWPAvnR-QDPS+DZAUg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-22 17:24 ` Vivek Gautam
2018-02-22 17:24 ` Vivek Gautam
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