linux-kernel - Re: [PATCH] PCI/P2PDMA: Save a few cycles in 'pci_alloc

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Date:   Wed, 15 Dec 2021 16:04:33 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH] PCI/P2PDMA: Save a few cycles in 'pci_alloc_p2pmem()'

On Wed, Dec 15, 2021 at 02:51:51PM -0700, Logan Gunthorpe wrote:
> 
> 
> On 2021-12-15 2:47 p.m., Bjorn Helgaas wrote:
> > On Wed, Dec 15, 2021 at 02:37:51PM -0700, Logan Gunthorpe wrote:
> >> On 2021-12-15 10:35 a.m., Bjorn Helgaas wrote:
> >>> Maybe we need a MAINTAINERS entry for P2PDMA?
> >>
> >> I'm not opposed to this. Would it be a duplicate of the PCI SUBSYSTEM
> >> just with my name added as maintainer? I could send a patch if so.
> > 
> > Maybe something like this?  Are there other relevant files?  I just
> > want to make sure that you see updates to p2pdma stuff.
> 
> Largely looks good to me.
> 
> The one missing file is:
> 
> Documentation/driver-api/pci/p2pdma.rst
> 
> Do you want me to put that in a patch or will you handle it?

I put the patch below on pci/p2pdma for v5.17, let me know if you want
any other tweaks.

I had mistakenly included these, which don't include any P2PDMA
content, so I dropped them so you don't get inundated with other
random changes:

  +F:     Documentation/PCI/
  +F:     Documentation/devicetree/bindings/pci/

commit bdebed96bd4d ("MAINTAINERS: Add Logan Gunthorpe as P2PDMA maintainer")
Author: Bjorn Helgaas <bhelgaas@...gle.com>
Date:   Wed Dec 15 15:43:04 2021 -0600

    MAINTAINERS: Add Logan Gunthorpe as P2PDMA maintainer
    
    Add a P2PDMA entry to make sure Logan is aware of changes to that area.
    
    Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index 7a2345ce8521..ea59e32e1e81 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14717,6 +14717,19 @@ L:	linux-pci@...r.kernel.org
 S:	Supported
 F:	Documentation/PCI/pci-error-recovery.rst
 
+PCI PEER-TO-PEER DMA (P2PDMA)
+M:	Bjorn Helgaas <bhelgaas@...gle.com>
+M:	Logan Gunthorpe <logang@...tatee.com>
+L:	linux-pci@...r.kernel.org
+S:	Supported
+Q:	https://patchwork.kernel.org/project/linux-pci/list/
+B:	https://bugzilla.kernel.org
+C:	irc://irc.oftc.net/linux-pci
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
+F:	Documentation/driver-api/pci/p2pdma.rst
+F:	drivers/pci/p2pdma.c
+F:	include/linux/pci-p2pdma.h
+
 PCI MSI DRIVER FOR ALTERA MSI IP
 M:	Joyce Ooi <joyce.ooi@...el.com>
 L:	linux-pci@...r.kernel.org