From: Christoph Hellwig <hch@lst.de>
To: Jim Quinlan <jim2101024@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>,
Robin Murphy <robin.murphy@arm.com>,
linux-kernel@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>,
Linux-MIPS <linux-mips@linux-mips.org>,
Florian Fainelli <f.fainelli@gmail.com>,
devicetree@vger.kernel.org, linux-pci <linux-pci@vger.kernel.org>,
Kevin Cernekee <cernekee@gmail.com>,
Will Deacon <will.deacon@arm.com>,
Ralf Baechle <ralf@linux-mips.org>,
Rob Herring <robh+dt@kernel.org>,
bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>,
Gregory Fong <gregory.0xf0@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Brian Norris <computersforpeace@gmail.com>,
linux-arm-kernel@lists.infradead.org,
Marek Szyprowski <m.szyprowski@samsung.com>,
iommu@lists.linux-foun
Subject: Re: [PATCH 5/9] PCI: host: brcmstb: add dma-ranges for inbound traffic
Date: Fri, 20 Oct 2017 18:17:19 +0200 [thread overview]
Message-ID: <20171020161719.GA6247@lst.de> (raw)
In-Reply-To: <CANCKTBtxp9gSdndKAZ7xGA+VozQsn2PX_-9P8A22_5Matbb7-w@mail.gmail.com>
On Fri, Oct 20, 2017 at 11:27:41AM -0400, Jim Quinlan wrote:
> memc0-a@[ 0....3fffefff] <=> pci@[ 0....3fffefff]
> memc0-b@[100000000...13fffefff] <=> pci@[ 40000000....7fffefff]
> memc1-a@[ 40000000....7fffefff] <=> pci@[ 80000000....bfffefff]
> memc1-b@[300000000...33fffefff] <=> pci@[ c0000000....ffffefff]
> memc2-a@[ 80000000....bfffefff] <=> pci@[100000000...13fffefff]
> memc2-b@[c00000000...c3fffffff] <=> pci@[140000000...17fffffff]
>
> This leaves a one-page gap between phsyical memory regions which would
> normally be contiguous. One cannot have a dma alloc that spans any two
> regions. This is a drastic step, but I don't see an alternative.
> Perhaps I may be missing what you are saying...
Ok, IFF we are guranteed to always have a gap between physical memory
locations we are fine indeed.
next prev parent reply other threads:[~2017-10-20 16:17 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1507761269-7017-1-git-send-email-jim2101024@gmail.com>
[not found] ` <1507761269-7017-6-git-send-email-jim2101024@gmail.com>
[not found] ` <1507761269-7017-6-git-send-email-jim2101024-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-10-12 18:04 ` [PATCH 5/9] PCI: host: brcmstb: add dma-ranges for inbound traffic Robin Murphy
2017-10-12 21:43 ` Jim Quinlan
2017-10-17 8:14 ` Christoph Hellwig
2017-10-17 16:11 ` Jim Quinlan
[not found] ` <CANCKTBsCB+x2XgrND9AhRtxPkCXfps1nA+YymkZjKHOUZfjSHQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-18 6:53 ` Christoph Hellwig
[not found] ` <20171018065316.GA11183-jcswGhMUV9g@public.gmane.org>
2017-10-18 14:41 ` Jim Quinlan
[not found] ` <CANCKTBv+yiCNsrnx3m+W9wPqC4NdKPZ2p=zLtSa8fX6v1rPcYQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-19 9:16 ` Christoph Hellwig
2017-10-19 22:47 ` Jim Quinlan
[not found] ` <CANCKTBuaTD29My77QfOeUmtZfLAmmJXUYe6QvBW+uoH2Kb+tAQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-20 7:37 ` Christoph Hellwig
[not found] ` <20171020073730.GA12937-jcswGhMUV9g@public.gmane.org>
2017-10-20 14:41 ` Jim Quinlan
2017-10-20 14:57 ` Christoph Hellwig
2017-10-20 15:27 ` Jim Quinlan
2017-10-20 16:17 ` Christoph Hellwig [this message]
[not found] ` <CANCKTBtxp9gSdndKAZ7xGA+VozQsn2PX_-9P8A22_5Matbb7-w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-23 9:06 ` David Laight
[not found] ` <063D6719AE5E284EB5DD2968C1650D6DD009F05A-VkEWCZq2GCInGFn1LkZF6NBPR1lH4CV8@public.gmane.org>
2017-10-24 18:08 ` Jim Quinlan
2017-10-25 9:36 ` David Laight
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