From: Yong Wu <yong.wu@mediatek.com>
To: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>,
Joerg Roedel <joro@8bytes.org>, Rob Herring <robh+dt@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
Evan Green <evgreen@chromium.org>, Tomasz Figa <tfiga@google.com>,
Tomasz Figa <tfiga@chromium.org>,
<linux-mediatek@lists.infradead.org>,
<srv_heupstream@mediatek.com>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<iommu@lists.linux-foundation.org>, <youlin.pei@mediatek.com>,
"Nicolas Boichat" <drinkcat@chromium.org>,
<anan.sun@mediatek.com>, <chao.hao@mediatek.com>
Subject: Re: [PATCH v2 11/29] iommu/mediatek: Always pm_runtime_get while tlb flush
Date: Thu, 7 Oct 2021 11:00:19 +0800 [thread overview]
Message-ID: <111c6f3905f4349e6e30cde60bdc70672ee036b3.camel@mediatek.com> (raw)
In-Reply-To: <11fe281d-4873-245b-f506-452900f33d3b@collabora.com>
On Thu, 2021-09-30 at 13:26 +0200, Dafna Hirschfeld wrote:
>
> On 13.08.21 08:53, Yong Wu wrote:
> > Prepare for 2 HWs that sharing pgtable in different power-domains.
> >
> > The previous SoC don't have PM. Only mt8192 has power-domain,
> > and it is display's power-domain which nearly always is enabled.
>
> hi, I see that in mt1873.dtsi, many devices that uses the iommu have
> the
> 'power-domains' property.
Sorry, I didn't clarify this clear. I mean the iommu device don't have
this property rather than the other device.
>
> >
> > When there are 2 M4U HWs, it may has problem.
> > In this function, we get the pm_status via the m4u dev, but it
> > don't
> > reflect the real power-domain status of the HW since there may be
> > other
> > HW also use that power-domain.
> >
> > Currently we could not get the real power-domain status, thus
> > always
> > pm_runtime_get here.
> >
> > Prepare for mt8195, thus, no need fix tags here.
> >
> > This patch may drop the performance, we expect the user could
> > pm_runtime_get_sync before dma_alloc_attrs which need tlb ops.
> >
>
> Could you explain this sentence a bit? should the user call
> pm_runtime_get_sync
> before calling dma_alloc_attrs?
In v3, I have removed this patch. Use [1] instead.
[1]
https://lore.kernel.org/linux-mediatek/20210923115840.17813-13-yong.wu@mediatek.com/
Thanks.
>
> Thanks,
> Dafna
>
> > Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> > ---
> > drivers/iommu/mtk_iommu.c | 5 ++++-
> > 1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> > index add23a36a5e2..abc721a1da21 100644
> > --- a/drivers/iommu/mtk_iommu.c
> > +++ b/drivers/iommu/mtk_iommu.c
> > @@ -238,8 +238,11 @@ static void
> > mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,
> >
> > for_each_m4u(data, head) {
> > if (has_pm) {
> > - if (pm_runtime_get_if_in_use(data->dev) <= 0)
> > + ret = pm_runtime_resume_and_get(data->dev);
> > + if (ret < 0) {
> > + dev_err(data->dev, "tlb flush: pm get
> > fail %d.\n", ret);
> > continue;
> > + }
> > }
> >
> > spin_lock_irqsave(&data->tlb_lock, flags);
> >
next prev parent reply other threads:[~2021-10-07 3:00 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-13 6:52 [PATCH v2 00/29] MT8195 IOMMU SUPPORT Yong Wu
2021-08-13 6:52 ` [PATCH v2 01/29] dt-bindings: mediatek: mt8195: Add binding for MM IOMMU Yong Wu
2021-08-13 6:52 ` [PATCH v2 02/29] dt-bindings: mediatek: mt8195: Add binding for infra IOMMU Yong Wu
2021-08-17 21:44 ` Rob Herring
2021-08-13 6:52 ` [PATCH v2 03/29] iommu/mediatek: Fix 2 HW sharing pgtable issue Yong Wu
2021-08-13 6:52 ` [PATCH v2 04/29] iommu/mediatek: Adapt sharing and non-sharing pgtable case Yong Wu
2021-08-13 6:53 ` [PATCH v2 05/29] iommu/mediatek: Add 12G~16G support for multi domains Yong Wu
2021-08-13 6:53 ` [PATCH v2 06/29] iommu/mediatek: Add a flag DCM_DISABLE Yong Wu
2021-08-13 6:53 ` [PATCH v2 07/29] iommu/mediatek: Add a flag NON_STD_AXI Yong Wu
2021-08-13 6:53 ` [PATCH v2 08/29] iommu/mediatek: Remove for_each_m4u in tlb_sync_all Yong Wu
2021-08-13 6:53 ` [PATCH v2 09/29] iommu/mediatek: Add tlb_lock in tlb_flush_all Yong Wu
2021-08-13 6:53 ` [PATCH v2 10/29] iommu/mediatek: Remove the granule in the tlb flush Yong Wu
2021-08-13 6:53 ` [PATCH v2 11/29] iommu/mediatek: Always pm_runtime_get while " Yong Wu
2021-08-24 7:10 ` Hsin-Yi Wang
2021-09-01 12:10 ` Yong Wu (吴勇)
2021-09-30 11:26 ` Dafna Hirschfeld
2021-10-07 3:00 ` Yong Wu [this message]
2021-08-13 6:53 ` [PATCH v2 12/29] iommu/mediatek: Always enable output PA over 32bits in isr Yong Wu
2021-08-13 6:53 ` [PATCH v2 13/29] iommu/mediatek: Add SUB_COMMON_3BITS flag Yong Wu
2021-08-13 6:53 ` [PATCH v2 14/29] iommu/mediatek: Add IOMMU_TYPE flag Yong Wu
2021-08-13 6:53 ` [PATCH v2 15/29] iommu/mediatek: Contain MM IOMMU flow with the MM TYPE Yong Wu
2021-08-13 6:53 ` [PATCH v2 16/29] iommu/mediatek: Adjust device link when it is sub-common Yong Wu
2021-08-24 7:35 ` Hsin-Yi Wang
2021-09-01 12:01 ` Yong Wu (吴勇)
2021-08-13 6:53 ` [PATCH v2 17/29] iommu/mediatek: Add infra iommu support Yong Wu
2021-08-13 6:53 ` [PATCH v2 18/29] iommu/mediatek: Add PCIe support Yong Wu
2021-08-13 6:53 ` [PATCH v2 19/29] iommu/mediatek: Add mt8195 support Yong Wu
2021-08-13 6:53 ` [PATCH v2 20/29] iommu/mediatek: Only adjust code about register base Yong Wu
2021-08-13 6:53 ` [PATCH v2 21/29] iommu/mediatek: Just move code position in hw_init Yong Wu
2021-08-13 6:53 ` [PATCH v2 22/29] iommu/mediatek: Add mtk_iommu_bank_data structure Yong Wu
2021-08-13 6:53 ` [PATCH v2 23/29] iommu/mediatek: Initialise bank HW for each a bank Yong Wu
2021-08-13 6:53 ` [PATCH v2 24/29] iommu/mediatek: Add bank_nr and bank_enable Yong Wu
2021-08-13 6:53 ` [PATCH v2 25/29] iommu/mediatek: Change the domid to iova_region_id Yong Wu
2021-08-13 6:53 ` [PATCH v2 26/29] iommu/mediatek: Get the proper bankid for multi banks Yong Wu
2021-08-13 6:53 ` [PATCH v2 27/29] iommu/mediatek: Initialise/Remove for multi bank dev Yong Wu
2021-08-13 6:53 ` [PATCH v2 28/29] iommu/mediatek: Backup/restore regsiters for multi banks Yong Wu
2021-08-13 6:53 ` [PATCH v2 29/29] iommu/mediatek: mt8195: Enable multi banks for infra iommu Yong Wu
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