From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Marc Zyngier <maz@kernel.org>,
Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Frank Wunderlich <frank-w@public-files.de>,
Thierry Reding <treding@nvidia.com>,
Thomas Gleixner <tglx@linutronix.de>,
Rob Herring <robh@kernel.org>, Will Deacon <will@kernel.org>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Michael Kelley <mikelley@microsoft.com>,
Wei Liu <wei.liu@kernel.org>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Ryder Lee <ryder.lee@mediatek.com>,
Marek Vasut <marek.vasut+renesas@gmail.com>,
Michal Simek <michal.simek@xilinx.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Bharat Kumar Gogada <bharatku@xilinx.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"linux-mediatek@lists.infradead.org"
<linux-mediatek@lists.infradead.org>,
"linux-renesas-soc@vger.kernel.org"
<linux-renesas-soc@vger.kernel.org>,
"kernel-team@android.com" <kernel-team@android.com>
Subject: RE: [PATCH v3 02/14] PCI: rcar: Don't allocate extra memory for the MSI capture address
Date: Thu, 1 Apr 2021 10:59:16 +0000 [thread overview]
Message-ID: <TY2PR01MB36924566960FE203EF3B2FC9D87B9@TY2PR01MB3692.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <20210330152857.GA27749@lpieralisi>
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@kernel.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@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Best regards,
Yoshihiro Shimoda
next prev parent reply other threads:[~2021-04-01 11:00 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-30 15:11 [PATCH v3 00/14] PCI/MSI: Getting rid of msi_controller, and other cleanups Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 01/14] PCI: tegra: Convert to MSI domains Marc Zyngier
2021-04-19 19:19 ` Jon Hunter
2021-04-19 20:02 ` Jon Hunter
[not found] ` <87fszlqria.wl-maz@kernel.org>
2021-04-20 12:45 ` Jon Hunter
2021-03-30 15:11 ` [PATCH v3 02/14] PCI: rcar: Don't allocate extra memory for the MSI capture address Marc Zyngier
2021-03-30 15:28 ` Lorenzo Pieralisi
2021-04-01 10:59 ` Yoshihiro Shimoda [this message]
2021-03-30 15:11 ` [PATCH v3 03/14] PCI: rcar: Convert to MSI domains Marc Zyngier
2021-04-01 10:19 ` Lorenzo Pieralisi
2021-04-01 10:38 ` Marc Zyngier
2021-04-01 11:03 ` Lorenzo Pieralisi
2021-03-30 15:11 ` [PATCH v3 04/14] PCI: xilinx: Don't allocate extra memory for the MSI capture address Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 05/14] PCI: xilinx: Convert to MSI domains Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 06/14] PCI: hv: Drop msi_controller structure Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 07/14] PCI/MSI: Drop use of msi_controller from core code Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 08/14] PCI/MSI: Kill msi_controller structure Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 09/14] PCI/MSI: Kill default_teardown_msi_irqs() Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 10/14] PCI/MSI: Let PCI host bridges declare their reliance on MSI domains Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 11/14] PCI/MSI: Make pci_host_common_probe() declare its " Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 12/14] PCI: mediatek: Advertise lack of built-in MSI handling Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 13/14] PCI/MSI: Document the various ways of ending up with NO_MSI Marc Zyngier
2021-05-18 4:28 ` Jeremy Linton
2021-05-18 8:59 ` Marc Zyngier
2021-03-30 15:11 ` [PATCH v3 14/14] PCI: Refactor HT advertising of NO_MSI flag Marc Zyngier
2021-04-01 11:27 ` [PATCH v3 00/14] PCI/MSI: Getting rid of msi_controller, and other cleanups Lorenzo Pieralisi
2021-04-01 12:07 ` Marc Zyngier
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