linux-kernel - Re: [PATCH 03/13] PCI: xilinx: Convert to MSI domains

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Date:   Mon, 22 Mar 2021 13:33:10 +0100
From:   Michal Simek <monstr@...str.eu>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>, michal.simek@...inx.com
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Thierry Reding <treding@...dia.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh@...nel.org>, Will Deacon <will@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-hyperv@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH 03/13] PCI: xilinx: Convert to MSI domains

Hi,

On 3/22/21 1:21 PM, Lorenzo Pieralisi wrote:
> On Thu, Feb 25, 2021 at 03:10:13PM +0000, Marc Zyngier wrote:
>> In anticipation of the removal of the msi_controller structure, convert
>> the ancient xilinx host controller driver to MSI domains.
>>
>> We end-up with the usual two domain structure, the top one being a
>> generic PCI/MSI domain, the bottom one being xilinx-specific and handling
>> the actual HW interrupt allocation.
>>
>> This allows us to fix some of the most appaling MSI programming, where
>> the message programmed in the device is the virtual IRQ number instead
>> of the allocated vector number. The allocator is also made safe with
>> a mutex. This should allow support for MultiMSI, but I decided not to
>> even try, since I cannot test it.
>>
>> Also take the opportunity to get rid of the cargo-culted memory allocation
>> for the MSI capture address. *ANY* sufficiently aligned address should
>> be good enough, so use the physical address of the xilinx_pcie_host
>> structure instead.
>>
>> Signed-off-by: Marc Zyngier <maz@...nel.org>
>> ---
>>  drivers/pci/controller/Kconfig       |   2 +-
>>  drivers/pci/controller/pcie-xilinx.c | 238 +++++++++++----------------
>>  2 files changed, 96 insertions(+), 144 deletions(-)
> 
> Michal,
> 
> can you please test these changes or make sure someone does and report
> back on the mailing list please ?
> 
> I would like to merge this series for v5.13.

I got just private response (not sure why) from Bharat March 5 that
changes are fine.
It means go ahead with it.

Thanks,
Michal