linux-kernel - Re: [PATCH v2 0/5] PCI: dwc: improve msi handling

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Message-ID: <435c8cf8-8f4a-c491-4aca-3ec5b7abe49a@nvidia.com>
Date:   Thu, 8 Oct 2020 11:02:54 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>
CC:     Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Richard Zhu <hongxing.zhu@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "Pengutronix Kernel Team" <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        "NXP Linux Team" <linux-imx@....com>,
        Yue Wang <yue.wang@...ogic.com>,
        "Kevin Hilman" <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
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        Jesper Nilsson <jesper.nilsson@...s.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Xiaowei Song <songxiaowei@...ilicon.com>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Andy Gross <agross@...nel.org>,
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        Stanimir Varbanov <svarbanov@...sol.com>,
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        Jonathan Hunter <jonathanh@...dia.com>,
        "Kunihiko Hayashi" <hayashi.kunihiko@...ionext.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
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        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v2 0/5] PCI: dwc: improve msi handling



On 10/6/2020 12:06 PM, Jisheng Zhang wrote:
> External email: Use caution opening links or attachments
> 
> 
> On Tue, 6 Oct 2020 11:56:34 +0530 Vidya Sagar wrote:
> 
>>
>>
>> Hi,
> 
> Hi,
> 
>> I would like to verify this series along with the other series "PCI:
>> dwc: fix two MSI issues" on Tegra194. I tried to apply these series on
>> both linux-next and Lorenzo's pci/dwc branches but there seem to be non
>> trivial conflicts. Could you please tell me which branch I can use and
>> apply these series cleanly?
> 
> This is a fix, so I thought the series would be picked up in v5.9, so the
> series is patched against v5.9-rcN
> 
> could you please try v5 https://lkml.org/lkml/2020/9/29/2511 on v5.9-rc7?
I tried this series on top of v5.9-rc7 and it worked as expected on 
Tegra194 platform. Also, I couldn't cleanly apply the other series 'PCI: 
dwc: fix two MSI issues' on top. Could you please rebase them?

Thanks,
Vidya Sagar
> 
> 
> Thanks
> 
>> FWIW, I acknowledge that the existing code does leak MSI target page
>> every time system goes through suspend-resume sequence on Tegra194.
>>
>> Thanks,
>> Vidya Sagar
>>
>> On 9/24/2020 4:35 PM, Jisheng Zhang wrote:
>>> External email: Use caution opening links or attachments
>>>
>>>
>>> Improve the msi code:
>>> 1. Add proper error handling.
>>> 2. Move dw_pcie_msi_init() from each users to designware host to solve
>>> msi page leakage in resume path.
>>>
>>> Since v1:
>>>     - add proper error handling patches.
>>>     - solve the msi page leakage by moving dw_pcie_msi_init() from each
>>>       users to designware host
>>>
>>>
>>> Jisheng Zhang (5):
>>>     PCI: dwc: Call dma_unmap_page() before freeing the msi page
>>>     PCI: dwc: Check alloc_page() return value
>>>     PCI: dwc: Rename dw_pcie_free_msi to dw_pcie_msi_deinit
>>>     PCI: dwc: Skip PCIE_MSI_INTR0* programming if MSI is disabled
>>>     PCI: dwc: Move dw_pcie_msi_init() from each users to designware host
>>>
>>>    drivers/pci/controller/dwc/pci-dra7xx.c       |  1 +
>>>    drivers/pci/controller/dwc/pci-exynos.c       |  2 -
>>>    drivers/pci/controller/dwc/pci-imx6.c         |  3 --
>>>    drivers/pci/controller/dwc/pci-meson.c        |  8 ----
>>>    drivers/pci/controller/dwc/pcie-artpec6.c     | 10 -----
>>>    .../pci/controller/dwc/pcie-designware-host.c | 43 +++++++++++++------
>>>    .../pci/controller/dwc/pcie-designware-plat.c |  3 --
>>>    drivers/pci/controller/dwc/pcie-designware.h  |  9 +++-
>>>    drivers/pci/controller/dwc/pcie-histb.c       |  3 --
>>>    drivers/pci/controller/dwc/pcie-kirin.c       |  3 --
>>>    drivers/pci/controller/dwc/pcie-qcom.c        |  3 --
>>>    drivers/pci/controller/dwc/pcie-spear13xx.c   |  1 -
>>>    drivers/pci/controller/dwc/pcie-tegra194.c    |  2 -
>>>    drivers/pci/controller/dwc/pcie-uniphier.c    |  9 +---
>>>    14 files changed, 38 insertions(+), 62 deletions(-)
>>>
>>> --
>>> 2.28.0
>>>
>