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From: Rob Herring <robh@kernel.org>
To: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Jingoo Han <jingoohan1@gmail.com>,
	Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
	linux-omap@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 2/2] PCI: dwc: Fix MSI page leakage in suspend/resume
Date: Wed, 7 Oct 2020 12:41:19 -0500	[thread overview]
Message-ID: <20201007174119.GA376477@bogus> (raw)
In-Reply-To: <20200930091449.50ae0caf@xhacker.debian>

On Wed, Sep 30, 2020 at 09:15:25AM +0800, Jisheng Zhang wrote:
> Currently, dw_pcie_msi_init() allocates and maps page for msi, then
> program the PCIE_MSI_ADDR_LO and PCIE_MSI_ADDR_HI. The Root Complex
> may lose power during suspend-to-RAM, so when we resume, we want to
> redo the latter but not the former. If designware based driver (for
> example, pcie-tegra194.c) calls dw_pcie_msi_init() in resume path, the
> msi page will be leaked.
> 
> As pointed out by Rob and Ard, there's no need to allocate a page for
> the MSI address, we could use an address in the driver data.
> 
> To avoid map the MSI msg again during resume, we move the map MSI msg
> from dw_pcie_msi_init() to dw_pcie_host_init().
> 
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> ---
>  drivers/pci/controller/dwc/pci-dra7xx.c       | 18 ++++++++++-
>  .../pci/controller/dwc/pcie-designware-host.c | 32 +++++++++----------
>  drivers/pci/controller/dwc/pcie-designware.h  |  2 +-
>  3 files changed, 34 insertions(+), 18 deletions(-)

I'm working on some larger MSI clean-ups which should eliminate the 
dra7xx addition, but this is good enough for now.

Reviewed-by: Rob Herring <robh@kernel.org>

  reply	other threads:[~2020-10-07 17:41 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-30  1:12 [PATCH v5 0/2] PCI: dwc: fix two MSI issues Jisheng Zhang
2020-09-30  1:12 ` [PATCH v5 1/2] PCI: dwc: Skip PCIE_MSI_INTR0* programming if MSI is disabled Jisheng Zhang
2020-09-30  1:15 ` [PATCH v5 2/2] PCI: dwc: Fix MSI page leakage in suspend/resume Jisheng Zhang
2020-10-07 17:41   ` Rob Herring [this message]
2020-10-08 11:36 ` [PATCH v5 0/2] PCI: dwc: fix two MSI issues Lorenzo Pieralisi
2020-10-09  7:10   ` Jisheng Zhang

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