linux-kernel - RE: [PATCH 0/4] Redesign MSI-X support in PCIe Endpoint Core

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Date:   Thu, 9 Jan 2020 10:20:59 +0000
From:   Xiaowei Bao <xiaowei.bao@....com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>
CC:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <andrew.murray@....com>,
        Murali Karicheri <m-karicheri2@...com>,
        Jingoo Han <jingoohan1@...il.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>
Subject: RE: [PATCH 0/4] Redesign MSI-X support in PCIe Endpoint Core



> -----Original Message-----
> From: Kishon Vijay Abraham I <kishon@...com>
> Sent: 2020年1月9日 18:19
> To: Bjorn Helgaas <helgaas@...nel.org>; Gustavo Pimentel
> <gustavo.pimentel@...opsys.com>; Xiaowei Bao <xiaowei.bao@....com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>; Andrew Murray
> <andrew.murray@....com>; Murali Karicheri <m-karicheri2@...com>; Jingoo
> Han <jingoohan1@...il.com>; linux-pci@...r.kernel.org;
> linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> Subject: Re: [PATCH 0/4] Redesign MSI-X support in PCIe Endpoint Core
> 
> Hi,
> 
> On 12/12/19 4:16 AM, Bjorn Helgaas wrote:
> > On Wed, Dec 11, 2019 at 06:16:04PM +0530, Kishon Vijay Abraham I wrote:
> >> Existing MSI-X support in Endpoint core has limitations:
> >>  1) MSIX table (which is mapped to a BAR) is not allocated by
> >>     anyone. Ideally this should be allocated by endpoint
> >>     function driver.
> >>  2) Endpoint controller can choose any random BARs for MSIX
> >>     table (irrespective of whether the endpoint function driver
> >>     has allocated memory for it or not)
> >>
> >> In order to avoid these limitations, pci_epc_set_msix() is modified
> >> to include BAR Indicator register (BIR) configuration and MSIX table
> >> offset as arguments. This series also fixed MSIX support in dwc
> >> driver and add MSI-X support in Cadence PCIe driver.
> >>
> >> The previous version of Cadence EP MSI-X support is @ [1].
> >> This series is created on top of [2]
> >>
> >> [1] ->
> >> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpat
> >>
> chwork.ozlabs.org%2Fpatch%2F971160%2F&amp;data=02%7C01%7Cxiaowei
> .bao%
> >>
> 40nxp.com%7Ca1c78017032c4f4882b708d794ed1e9c%7C686ea1d3bc2b4c6
> fa92cd9
> >>
> 9c5c301635%7C0%7C0%7C637141618459605704&amp;sdata=o1gFrMe%2B
> DERcNIVjK
> >> 5ZRJnDmO1QfAKQostQci05%2BrJA%3D&amp;reserved=0
> >> [2] ->
> >> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flore
> >> .kernel.org%2Fr%2F20191209092147.22901-1-kishon%40ti.com&amp;dat
> a=02%
> >>
> 7C01%7Cxiaowei.bao%40nxp.com%7Ca1c78017032c4f4882b708d794ed1e9
> c%7C686
> >>
> ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637141618459605704&a
> mp;sdata=
> >>
> fdZEFSCBc89vBEZlCUpuoIjZqrsqWPdNaNt3nMFdO0I%3D&amp;reserved=0
> >>
> >> Alan Douglas (1):
> >>   PCI: cadence: Add MSI-X support to Endpoint driver
> >>
> >> Kishon Vijay Abraham I (3):
> >>   PCI: endpoint: Fix ->set_msix() to take BIR and offset as arguments
> >>   PCI: dwc: Fix dw_pcie_ep_raise_msix_irq() to get correct MSIX table
> >>     address
> >>   PCI: keystone: Add AM654 PCIe Endpoint to raise MSIX interrupt
> >
> > Trivial nits:
> >
> >   - There's a mix of "MSI-X" and "MSIX" in the subjects, commit logs,
> >     and comments.  I prefer "MSI-X" to match usage in the spec.
> >
> >   - "Fixes:" tags need not include "commit".  It doesn't *hurt*
> >     anything, but it takes up space that could be used for the
> >     subject.
> >
> >   - Commit references typically use a 12-char SHA1.  Again, doesn't
> >     hurt anything.
> 
> I'll fix all this in my next revision.
> 
> Xiaowei, Gustavo,
> 
> The issues we discussed in  [1] should be fixed with this series. Can you help
> test this in your platforms?

OK, I will test it when I am free, and give the feedback to you.

Thanks
Xiaowei

> 
> [1] ->
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.or
> g%2Flkml%2F2019%2F11%2F6%2F678&amp;data=02%7C01%7Cxiaowei.bao
> %40nxp.com%7Ca1c78017032c4f4882b708d794ed1e9c%7C686ea1d3bc2b4c
> 6fa92cd99c5c301635%7C0%7C0%7C637141618459605704&amp;sdata=nmJ
> GiBLcEUnBFTaaoJUOhL290cmA7F%2F2uBnTpvw9ugo%3D&amp;reserved=0
> 
> Thanks
> Kishon
> >