From: Bjorn Helgaas <helgaas@kernel.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Srinath Mannam <srinath.mannam@broadcom.com>,
Joerg Roedel <joro@8bytes.org>,
Robin Murphy <robin.murphy@arm.com>,
poza@codeaurora.org, Ray Jui <rjui@broadcom.com>,
bcm-kernel-feedback-list@broadcom.com, linux-pci@vger.kernel.org,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 0/3] PCIe Host request to reserve IOVA
Date: Wed, 1 May 2019 07:55:31 -0500 [thread overview]
Message-ID: <20190501125530.GA15590@google.com> (raw)
In-Reply-To: <20190501113038.GA7961@e121166-lin.cambridge.arm.com>
On Wed, May 01, 2019 at 12:30:38PM +0100, Lorenzo Pieralisi wrote:
> On Fri, Apr 12, 2019 at 08:43:32AM +0530, Srinath Mannam wrote:
> > Few SOCs have limitation that their PCIe host can't allow few inbound
> > address ranges. Allowed inbound address ranges are listed in dma-ranges
> > DT property and this address ranges are required to do IOVA mapping.
> > Remaining address ranges have to be reserved in IOVA mapping.
> >
> > PCIe Host driver of those SOCs has to list resource entries of allowed
> > address ranges given in dma-ranges DT property in sorted order. This
> > sorted list of resources will be processed and reserve IOVA address for
> > inaccessible address holes while initializing IOMMU domain.
> >
> > This patch set is based on Linux-5.0-rc2.
> >
> > Changes from v3:
> > - Addressed Robin Murphy review comments.
> > - pcie-iproc: parse dma-ranges and make sorted resource list.
> > - dma-iommu: process list and reserve gaps between entries
> >
> > Changes from v2:
> > - Patch set rebased to Linux-5.0-rc2
> >
> > Changes from v1:
> > - Addressed Oza review comments.
> >
> > Srinath Mannam (3):
> > PCI: Add dma_ranges window list
> > iommu/dma: Reserve IOVA for PCIe inaccessible DMA address
> > PCI: iproc: Add sorted dma ranges resource entries to host bridge
> >
> > drivers/iommu/dma-iommu.c | 19 ++++++++++++++++
> > drivers/pci/controller/pcie-iproc.c | 44 ++++++++++++++++++++++++++++++++++++-
> > drivers/pci/probe.c | 3 +++
> > include/linux/pci.h | 1 +
> > 4 files changed, 66 insertions(+), 1 deletion(-)
>
> Bjorn, Joerg,
>
> this series should not affect anything in the mainline other than its
> consumer (ie patch 3); if that's the case should we consider it for v5.2
> and if yes how are we going to merge it ?
I acked the first one
Robin reviewed the second
(https://lore.kernel.org/lkml/e6c812d6-0cad-4cfd-defd-d7ec427a6538@arm.com)
(though I do agree with his comment about DMA_BIT_MASK()), Joerg was OK
with it if Robin was
(https://lore.kernel.org/lkml/20190423145721.GH29810@8bytes.org).
Eric reviewed the third (and pointed out a typo).
My Kconfiggery never got fully answered -- it looks to me as though it's
possible to build pcie-iproc without the DMA hole support, and I thought
the whole point of this series was to deal with those holes
(https://lore.kernel.org/lkml/20190418234241.GF126710@google.com). I would
have expected something like making pcie-iproc depend on IOMMU_SUPPORT.
But Srinath didn't respond to that, so maybe it's not an issue and it
should only affect pcie-iproc anyway.
So bottom line, I'm fine with merging it for v5.2. Do you want to merge
it, Lorenzo, or ...?
Bjorn
next prev parent reply other threads:[~2019-05-01 12:55 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-12 3:13 [PATCH v4 0/3] PCIe Host request to reserve IOVA Srinath Mannam
2019-04-12 3:13 ` [PATCH v4 1/3] PCI: Add dma_ranges window list Srinath Mannam
2019-04-18 23:49 ` Bjorn Helgaas
2019-04-12 3:13 ` [PATCH v4 2/3] iommu/dma: Reserve IOVA for PCIe inaccessible DMA address Srinath Mannam
2019-04-29 16:09 ` Robin Murphy
2019-04-12 3:13 ` [PATCH v4 3/3] PCI: iproc: Add sorted dma ranges resource entries to host bridge Srinath Mannam
2019-04-30 10:19 ` Auger Eric
2019-05-01 14:37 ` Lorenzo Pieralisi
2019-05-01 15:44 ` Srinath Mannam
2019-04-12 22:34 ` [PATCH v4 0/3] PCIe Host request to reserve IOVA Bjorn Helgaas
2019-04-16 11:58 ` Srinath Mannam
2019-04-18 23:42 ` Bjorn Helgaas
2019-04-18 23:48 ` Bjorn Helgaas
2019-04-23 14:57 ` Joerg Roedel
2019-05-01 11:30 ` Lorenzo Pieralisi
2019-05-01 12:55 ` Bjorn Helgaas [this message]
2019-05-01 13:20 ` Robin Murphy
2019-05-01 13:54 ` Lorenzo Pieralisi
2019-05-01 15:32 ` Srinath Mannam
2019-05-01 15:24 ` Srinath Mannam
2019-05-01 15:22 ` Srinath Mannam
2019-05-02 9:54 ` David Laight
2019-05-03 5:25 ` Srinath Mannam
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