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

From: Vidya Sagar <vidyas@nvidia.com>
To: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Rob Herring <robh@kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Jingoo Han <jingoohan1@gmail.com>, Kukjin Kim <kgene@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Richard Zhu <hongxing.zhu@nxp.com>,
	Lucas Stach <l.stach@pengutronix.de>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	"Pengutronix Kernel Team" <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	"NXP Linux Team" <linux-imx@nxp.com>,
	Yue Wang <yue.wang@Amlogic.com>,
	"Kevin Hilman" <khilman@baylibre.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	Jesper Nilsson <jesper.nilsson@axis.com>,
	Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
	Xiaowei Song <songxiaowei@hisilicon.com>,
	Binghui Wang <wangbinghui@hisilicon.com>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Stanimir Varbanov <svarbanov@mm-sol.com>,
	Pratyush Anand <pratyush.anand@gmail.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	"Kunihiko Hayashi" <hayashi.kunihiko@socionext.com>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-samsung-soc@vger.kernel.org" 
	<linux-samsung-soc@vger.kernel.org>,
	"linux-amlogic@lists.infradead.org" 
	<linux-amlogic@lists.infradead.org>,
	"linux-arm-kernel@axis.com" <linux-arm-kernel@axis.com>,
	"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
	"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>
Subject: Re: [PATCH v2 0/5] PCI: dwc: improve msi handling
Date: Thu, 8 Oct 2020 11:02:54 +0530	[thread overview]
Message-ID: <435c8cf8-8f4a-c491-4aca-3ec5b7abe49a@nvidia.com> (raw)
In-Reply-To: <20201006143647.3f989340@xhacker.debian>


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
>>>
>