From: Bjorn Helgaas <helgaas@kernel.org>
To: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: "Rob Herring" <robh@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Jingoo Han" <jingoohan1@gmail.com>,
"Gustavo Pimentel" <gustavo.pimentel@synopsys.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Serge Semin" <fancer.lancer@gmail.com>,
"Alexey Malahov" <Alexey.Malahov@baikalelectronics.ru>,
"Pavel Parkhomenko" <Pavel.Parkhomenko@baikalelectronics.ru>,
"Frank Li" <Frank.Li@nxp.com>,
"Manivannan Sadhasivam" <manivannan.sadhasivam@linaro.org>,
"Rob Herring" <robh+dt@kernel.org>,
linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH RESEND v4 15/15] PCI: dwc: Introduce dma-ranges property support for RC-host
Date: Thu, 28 Jul 2022 17:11:20 -0500 [thread overview]
Message-ID: <20220728221120.GA330510@bhelgaas> (raw)
In-Reply-To: <20220624143947.8991-16-Sergey.Semin@baikalelectronics.ru>
On Fri, Jun 24, 2022 at 05:39:47PM +0300, Serge Semin wrote:
> In accordance with the generic PCIe Root Port DT-bindings the "dma-ranges"
> property has the same format as the "ranges" property. The only difference
> is in their semantics. The "dma-ranges" property describes the PCIe-to-CPU
> memory mapping in opposite to the CPU-to-PCIe mapping of the "ranges"
> property. Even though the DW PCIe controllers are normally equipped with
> the internal Address Translation Unit which inbound and outbound tables
> can be used to implement both properties semantics, it was surprising for
> me to discover that the host-related part of the DW PCIe driver currently
> supports the "ranges" property only while the "dma-ranges" windows are
> just ignored. Having the "dma-ranges" supported in the driver would be
> very handy for the platforms, that don't tolerate the 1:1 CPU-PCIe memory
> mapping and require a customized PCIe memory layout. So let's fix that by
> introducing the "dma-ranges" property support.
Do we have a platform that requires this yet? Or does this fix a bug?
I see that dw_pcie_host_init() calls devm_pci_alloc_host_bridge(),
which eventually parses "dma-ranges", but I don't see any DWC DT
bindings that use it yet.
I'm not clear on what value this adds today.
Bjorn
next prev parent reply other threads:[~2022-07-28 22:11 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-24 14:39 [PATCH RESEND v4 00/15] PCI: dwc: Add hw version and dma-ranges support Serge Semin
2022-06-24 14:39 ` [PATCH RESEND v4 01/15] PCI: dwc: Add more verbose link-up message Serge Semin
2022-08-01 12:59 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 02/15] PCI: dwc: Detect iATU settings after getting "addr_space" resource Serge Semin
2022-07-28 14:38 ` Bjorn Helgaas
2022-08-01 13:01 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 03/15] PCI: dwc: Convert to using native IP-core versions representation Serge Semin
2022-07-28 15:24 ` Bjorn Helgaas
2022-07-28 15:31 ` Ben Dooks
2022-07-28 16:34 ` Bjorn Helgaas
2022-07-28 18:53 ` Serge Semin
2022-08-01 13:07 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 04/15] PCI: dwc: Add IP-core version detection procedure Serge Semin
2022-08-01 13:12 ` Manivannan Sadhasivam
2022-08-01 20:06 ` Bjorn Helgaas
2022-08-02 7:31 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 05/15] PCI: dwc: Introduce Synopsys IP-core versions/types interface Serge Semin
2022-08-01 13:21 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 06/15] PCI: intel-gw: Drop manual DW PCIe controller version setup Serge Semin
2022-08-01 13:28 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 07/15] PCI: tegra194: " Serge Semin
2022-06-27 7:59 ` Vidya Sagar
2022-06-27 22:31 ` Serge Semin
2022-08-01 13:29 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 08/15] PCI: dwc: Add host de-initialization callback Serge Semin
2022-08-01 13:33 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 09/15] PCI: dwc: Drop inbound iATU types enumeration - dw_pcie_as_type Serge Semin
2022-08-01 13:36 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 10/15] PCI: dwc: Drop iATU regions enumeration - dw_pcie_region_type Serge Semin
2022-08-01 13:37 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 11/15] PCI: dwc: Simplify in/outbound iATU setup methods Serge Semin
2022-08-01 13:50 ` Manivannan Sadhasivam
2022-08-01 20:11 ` Bjorn Helgaas
2022-06-24 14:39 ` [PATCH RESEND v4 12/15] PCI: dwc: Add iATU regions size detection procedure Serge Semin
2022-08-01 13:52 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 13/15] PCI: dwc: Verify in/out regions against iATU constraints Serge Semin
2022-08-01 13:53 ` Manivannan Sadhasivam
2022-06-24 14:39 ` [PATCH RESEND v4 14/15] PCI: dwc: Check iATU in/outbound ranges setup methods status Serge Semin
2022-08-01 13:54 ` Manivannan Sadhasivam
2022-08-01 20:17 ` Bjorn Helgaas
2022-06-24 14:39 ` [PATCH RESEND v4 15/15] PCI: dwc: Introduce dma-ranges property support for RC-host Serge Semin
2022-07-28 22:11 ` Bjorn Helgaas [this message]
2022-07-29 4:52 ` Serge Semin
2022-07-29 11:33 ` Bjorn Helgaas
2022-07-29 14:38 ` Serge Semin
2022-08-01 14:00 ` Manivannan Sadhasivam
2022-08-09 20:07 ` Serge Semin
2022-07-11 18:48 ` [PATCH RESEND v4 00/15] PCI: dwc: Add hw version and dma-ranges support Serge Semin
2022-07-27 22:49 ` Bjorn Helgaas
2022-07-28 12:21 ` Serge Semin
2022-07-29 2:36 ` Bjorn Helgaas
2022-09-28 8:10 ` Lorenzo Pieralisi
2022-09-28 10:53 ` Serge Semin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220728221120.GA330510@bhelgaas \
--to=helgaas@kernel.org \
--cc=Alexey.Malahov@baikalelectronics.ru \
--cc=Frank.Li@nxp.com \
--cc=Pavel.Parkhomenko@baikalelectronics.ru \
--cc=Sergey.Semin@baikalelectronics.ru \
--cc=bhelgaas@google.com \
--cc=devicetree@vger.kernel.org \
--cc=fancer.lancer@gmail.com \
--cc=gustavo.pimentel@synopsys.com \
--cc=jingoohan1@gmail.com \
--cc=kw@linux.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=lpieralisi@kernel.org \
--cc=manivannan.sadhasivam@linaro.org \
--cc=robh+dt@kernel.org \
--cc=robh@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).