linux-kernel - RE: [PATCH v3 02/14] PCI: rcar: Don't allocate extra memory for the MSI capture address

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Date:   Thu, 1 Apr 2021 10:59:16 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        Marek Vasut <marek.vasut+renesas@...il.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>,
        Michael Kelley <mikelley@...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>,
        Michal Simek <michal.simek@...inx.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Bharat Kumar Gogada <bharatku@...inx.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>
Subject: RE: [PATCH v3 02/14] PCI: rcar: Don't allocate extra memory for the
 MSI capture address

Hi Lorenzo, Marc,

> From: Lorenzo Pieralisi, Sent: Wednesday, March 31, 2021 12:29 AM
> 
> On Tue, Mar 30, 2021 at 04:11:33PM +0100, Marc Zyngier wrote:
> > A long cargo-culted behaviour of PCI drivers is to allocate memory
> > to obtain an address that is fed to the controller as the MSI
> > capture address (i.e. the MSI doorbell).
> >
> > But there is no actual requirement for this address to be RAM.
> > All it needs to be is a suitable aligned address that will
> > *not* be DMA'd to.
> >
> > Since the rcar platform already has a requirement that this
> > address should be in the first 4GB of the physical address space,
> > use the controller's own base address as the capture address.
> >
> > Signed-off-by: Marc Zyngier <maz@...nel.org>
> > ---
> >  drivers/pci/controller/pcie-rcar-host.c | 18 +++++++-----------
> >  1 file changed, 7 insertions(+), 11 deletions(-)
> 
> Marek, Yoshihiro,
> 
> can you test this patch please and report back ? It is not fundamental
> for the rest of the series (ie the rest of the series does not depend on
> it) and we can still merge the series without it but it would be good if
> you can review and test anyway.

I reviewed and tested this patch and it worked correctly.
So,

Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

Best regards,
Yoshihiro Shimoda