linux-kernel - Re: [PATCH v7 0/8] soc: ti: Add and use PVU on K3-AM65 for DMA isolation

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Message-ID: <aa3c8d033480801250b3fb0be29adda4a2c31f9e.camel@siemens.com>
Date: Tue, 22 Apr 2025 05:16:55 +0000
From: "Li, Hua Qian" <HuaQian.Li@...mens.com>
To: "nm@...com" <nm@...com>, "helgaas@...nel.org" <helgaas@...nel.org>
CC: "ssantosh@...nel.org" <ssantosh@...nel.org>, "kw@...ux.com"
	<kw@...ux.com>, "robh@...nel.org" <robh@...nel.org>, "iommu@...ts.linux.dev"
	<iommu@...ts.linux.dev>, "kristo@...nel.org" <kristo@...nel.org>,
	"robin.murphy@....com" <robin.murphy@....com>, "Kiszka, Jan"
	<jan.kiszka@...mens.com>, "linux-kernel@...r.kernel.org"
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 Bao Cheng" <baocheng.su@...mens.com>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-pci@...r.kernel.org"
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	"vigneshr@...com" <vigneshr@...com>, "Lopes Ivo, Diogo Miguel"
	<diogo.ivo@...mens.com>
Subject: Re: [PATCH v7 0/8] soc: ti: Add and use PVU on K3-AM65 for DMA
 isolation

On Fri, 2025-04-18 at 14:04 -0500, Nishanth Menon wrote:
> On 11:34-20250418, Bjorn Helgaas wrote:
> > On Fri, Apr 18, 2025 at 08:43:24AM -0500, Nishanth Menon wrote:
> > > On 15:30-20250418, huaqian.li@...mens.com wrote:
> > > > 
> > > > Jan Kiszka (7):
> > > >   dt-bindings: soc: ti: Add AM65 peripheral virtualization unit
> > > >   dt-bindings: PCI: ti,am65: Extend for use with PVU
> > > >   soc: ti: Add IOMMU-like PVU driver
> > > >   PCI: keystone: Add support for PVU-based DMA isolation on
> > > > AM654
> > > >   arm64: dts: ti: k3-am65-main: Add PVU nodes
> > > >   arm64: dts: ti: k3-am65-main: Add VMAP registers to PCI root
> > > > complexes
> > > >   arm64: dts: ti: iot2050: Add overlay for DMA isolation for
> > > > devices
> > > >     behind PCI RC
> > > > 
> > > > Li Hua Qian (1):
> > > >   swiotlb: Make IO_TLB_SEGSIZE configurable
> > > 
> > > I see at least 3 or 4 maintainers needing to co-ordinate, gets
> > > complicated as I am not sure which maintainer needs to pick up
> > > what
> > > patches in what dependency order. This looks like a mixed bag.
> > > Can
> > > we split this patch into independent series for each maintainer
> > > with
> > > clear indication of dependencies that is spread around a couple
> > > of
> > > kernel windows (maybe dts comes in last?)
> > 
> > The keystone patch ("[4/8] PCI: keystone: Add support for PVU-based
> > DMA isolation on AM654") depends on interfaces added by "[3/8] soc:
> > ti: Add IOMMU-like PVU driver", so I can't really take 4/8 by
> > itself.
> > 
> > But I've acked 4/8, so it can be merged along with the rest of the
> > series.  I assumed the easiest would be via the drivers/soc/ti/
> > maintainer, i.e., you, Nisanth :)
> > 
> > Let me know if I can do anything.
> 
> Thanks Bjorn, the swiotlb probably is one of the first to go in, I
> guess.. I will let Li Hua/Jan suggest how they'd like to queue this.
> 
Hi Nisanth, 

Apologies for making this series more complicated, and thank you,
Bjorn, for the explanation. I will take patch 8 and submit it as a new
upstreaming series separately.


-- 
Hua Qian Li
Siemens AG
www.siemens.com