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: <20250418163401.GA159541@bhelgaas>
Date: Fri, 18 Apr 2025 11:34:01 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Nishanth Menon <nm@...com>
Cc: huaqian.li@...mens.com, m.szyprowski@...sung.com, robin.murphy@....com,
	baocheng.su@...mens.com, bhelgaas@...gle.com, conor+dt@...nel.org,
	devicetree@...r.kernel.org, diogo.ivo@...mens.com,
	jan.kiszka@...mens.com, kristo@...nel.org, krzk+dt@...nel.org,
	kw@...ux.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	lpieralisi@...nel.org, robh@...nel.org, s-vadapalli@...com,
	ssantosh@...nel.org, vigneshr@...com, iommu@...ts.linux.dev
Subject: Re: [PATCH v7 0/8] soc: ti: Add and use PVU on K3-AM65 for DMA
 isolation

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.

Bjorn