From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Jim Quinlan <jim2101024-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org,
Florian Fainelli
<f.fainelli-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-pci <linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Kevin Cernekee <cernekee-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
Ralf Baechle <ralf-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
bcm-kernel-feedback-list
<bcm-kernel-feedback-list-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>,
Gregory Fong
<gregory.0xf0-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
Bjorn Helgaas <bhelgaas-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Brian Norris
<computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Marek Szyprowski
<m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Subject: Re: [PATCH 5/9] PCI: host: brcmstb: add dma-ranges for inbound traffic
Date: Fri, 20 Oct 2017 09:37:30 +0200 [thread overview]
Message-ID: <20171020073730.GA12937@lst.de> (raw)
In-Reply-To: <CANCKTBuaTD29My77QfOeUmtZfLAmmJXUYe6QvBW+uoH2Kb+tAQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Thu, Oct 19, 2017 at 06:47:45PM -0400, Jim Quinlan wrote:
> The only way to prevent this is to reserve a single page at the end of
> the first memory region of any pair that are adjacent in physical
> memory. A hack, yes, but I don't see an easier way out of this. Many
> if not most of our boards do not have adjacent regions and would not
> need this.
dma mappings can be much larger than a single page. For the block
world take a look at __blk_segment_map_sg which does the merging
of contiguous pages into a single SG segment. You'd have to override
BIOVEC_PHYS_MERGEABLE to prevent this from happening in your supported
architectures for the block layer.
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WARNING: multiple messages have this Message-ID (diff)
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.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-foundation.org
Subject: Re: [PATCH 5/9] PCI: host: brcmstb: add dma-ranges for inbound traffic
Date: Fri, 20 Oct 2017 09:37:30 +0200 [thread overview]
Message-ID: <20171020073730.GA12937@lst.de> (raw)
In-Reply-To: <CANCKTBuaTD29My77QfOeUmtZfLAmmJXUYe6QvBW+uoH2Kb+tAQ@mail.gmail.com>
On Thu, Oct 19, 2017 at 06:47:45PM -0400, Jim Quinlan wrote:
> The only way to prevent this is to reserve a single page at the end of
> the first memory region of any pair that are adjacent in physical
> memory. A hack, yes, but I don't see an easier way out of this. Many
> if not most of our boards do not have adjacent regions and would not
> need this.
dma mappings can be much larger than a single page. For the block
world take a look at __blk_segment_map_sg which does the merging
of contiguous pages into a single SG segment. You'd have to override
BIOVEC_PHYS_MERGEABLE to prevent this from happening in your supported
architectures for the block layer.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Jim Quinlan <jim2101024@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
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>,
linux-kernel@vger.kernel.org, Ralf Baechle <ralf@linux-mips.org>,
iommu@lists.linux-foundation.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>,
Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>,
linux-arm-kernel@lists.infradead.org,
Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [PATCH 5/9] PCI: host: brcmstb: add dma-ranges for inbound traffic
Date: Fri, 20 Oct 2017 09:37:30 +0200 [thread overview]
Message-ID: <20171020073730.GA12937@lst.de> (raw)
In-Reply-To: <CANCKTBuaTD29My77QfOeUmtZfLAmmJXUYe6QvBW+uoH2Kb+tAQ@mail.gmail.com>
On Thu, Oct 19, 2017 at 06:47:45PM -0400, Jim Quinlan wrote:
> The only way to prevent this is to reserve a single page at the end of
> the first memory region of any pair that are adjacent in physical
> memory. A hack, yes, but I don't see an easier way out of this. Many
> if not most of our boards do not have adjacent regions and would not
> need this.
dma mappings can be much larger than a single page. For the block
world take a look at __blk_segment_map_sg which does the merging
of contiguous pages into a single SG segment. You'd have to override
BIOVEC_PHYS_MERGEABLE to prevent this from happening in your supported
architectures for the block layer.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: hch@lst.de (Christoph Hellwig)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 5/9] PCI: host: brcmstb: add dma-ranges for inbound traffic
Date: Fri, 20 Oct 2017 09:37:30 +0200 [thread overview]
Message-ID: <20171020073730.GA12937@lst.de> (raw)
In-Reply-To: <CANCKTBuaTD29My77QfOeUmtZfLAmmJXUYe6QvBW+uoH2Kb+tAQ@mail.gmail.com>
On Thu, Oct 19, 2017 at 06:47:45PM -0400, Jim Quinlan wrote:
> The only way to prevent this is to reserve a single page at the end of
> the first memory region of any pair that are adjacent in physical
> memory. A hack, yes, but I don't see an easier way out of this. Many
> if not most of our boards do not have adjacent regions and would not
> need this.
dma mappings can be much larger than a single page. For the block
world take a look at __blk_segment_map_sg which does the merging
of contiguous pages into a single SG segment. You'd have to override
BIOVEC_PHYS_MERGEABLE to prevent this from happening in your supported
architectures for the block layer.
next prev parent reply other threads:[~2017-10-20 7:37 UTC|newest]
Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-11 22:34 PCI: brcmstb: Add Broadcom Settopbox PCIe support Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` [PATCH 1/9] SOC: brcmstb: add memory API Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-12 14:41 ` Julien Thierry
2017-10-12 14:41 ` Julien Thierry
2017-10-12 14:41 ` Julien Thierry
2017-10-12 16:53 ` Florian Fainelli
2017-10-12 16:53 ` Florian Fainelli
2017-10-12 16:53 ` Florian Fainelli
2017-10-17 8:24 ` Christoph Hellwig
2017-10-17 8:24 ` Christoph Hellwig
2017-10-17 8:24 ` Christoph Hellwig
2017-10-17 16:12 ` Florian Fainelli
2017-10-17 16:12 ` Florian Fainelli
2017-10-17 16:12 ` Florian Fainelli
2017-10-18 6:46 ` Christoph Hellwig
2017-10-18 6:46 ` Christoph Hellwig
2017-10-18 6:46 ` Christoph Hellwig
2017-10-18 16:47 ` Florian Fainelli
2017-10-18 16:47 ` Florian Fainelli
2017-10-11 22:34 ` [PATCH 2/9] PCI: host: brcmstb: add DT docs for Brcmstb PCIe device Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-12 0:55 ` Brian Norris
2017-10-12 0:55 ` Brian Norris
2017-10-12 0:55 ` Brian Norris
2017-10-12 0:55 ` Brian Norris
2017-10-12 17:52 ` Jim Quinlan
2017-10-12 17:52 ` Jim Quinlan
2017-10-12 17:52 ` Jim Quinlan
2017-10-17 20:24 ` Rob Herring
2017-10-17 20:24 ` Rob Herring
2017-10-17 20:24 ` Rob Herring
2017-10-17 22:42 ` Jim Quinlan
2017-10-17 22:42 ` Jim Quinlan
2017-10-17 22:42 ` Jim Quinlan
2017-10-19 21:49 ` Rob Herring
2017-10-19 21:49 ` Rob Herring
2017-10-19 21:49 ` Rob Herring
2017-10-19 21:58 ` Florian Fainelli
2017-10-19 21:58 ` Florian Fainelli
2017-10-19 21:58 ` Florian Fainelli
2017-10-20 17:27 ` Brian Norris
2017-10-20 17:27 ` Brian Norris
2017-10-20 17:27 ` Brian Norris
2017-10-20 17:27 ` Brian Norris
2017-10-20 21:39 ` Rob Herring
2017-10-20 21:39 ` Rob Herring
2017-10-20 21:39 ` Rob Herring
2017-10-19 23:04 ` Jim Quinlan
2017-10-19 23:04 ` Jim Quinlan
2017-10-19 23:04 ` Jim Quinlan
2017-10-19 23:04 ` Jim Quinlan
2017-10-11 22:34 ` [PATCH 3/9] PCI: host: brcmstb: Broadcom PCIe Host Controller Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` [PATCH 4/9] arm64: dma-mapping: export symbol arch_setup_dma_ops Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-12 17:06 ` Robin Murphy
2017-10-12 17:06 ` Robin Murphy
2017-10-12 17:06 ` Robin Murphy
2017-10-12 18:15 ` Jim Quinlan
2017-10-12 18:15 ` Jim Quinlan
2017-10-12 18:15 ` Jim Quinlan
2017-10-12 18:15 ` Jim Quinlan
2017-10-11 22:34 ` [PATCH 5/9] PCI: host: brcmstb: add dma-ranges for inbound traffic Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
[not found] ` <1507761269-7017-6-git-send-email-jim2101024-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-10-12 18:04 ` Robin Murphy
2017-10-12 18:04 ` Robin Murphy
2017-10-12 18:04 ` Robin Murphy
2017-10-12 18:04 ` Robin Murphy
2017-10-12 21:43 ` Jim Quinlan
2017-10-12 21:43 ` Jim Quinlan
2017-10-12 21:43 ` Jim Quinlan
2017-10-17 8:14 ` Christoph Hellwig
2017-10-17 8:14 ` Christoph Hellwig
2017-10-17 8:14 ` Christoph Hellwig
2017-10-17 16:11 ` Jim Quinlan
2017-10-17 16:11 ` Jim Quinlan
2017-10-17 16:11 ` Jim Quinlan
[not found] ` <CANCKTBsCB+x2XgrND9AhRtxPkCXfps1nA+YymkZjKHOUZfjSHQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-18 6:53 ` Christoph Hellwig
2017-10-18 6:53 ` Christoph Hellwig
2017-10-18 6:53 ` Christoph Hellwig
2017-10-18 6:53 ` Christoph Hellwig
[not found] ` <20171018065316.GA11183-jcswGhMUV9g@public.gmane.org>
2017-10-18 14:41 ` Jim Quinlan
2017-10-18 14:41 ` Jim Quinlan
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 9:16 ` Christoph Hellwig
2017-10-19 9:16 ` Christoph Hellwig
2017-10-19 9:16 ` Christoph Hellwig
2017-10-19 22:47 ` Jim Quinlan
2017-10-19 22:47 ` Jim Quinlan
2017-10-19 22:47 ` Jim Quinlan
[not found] ` <CANCKTBuaTD29My77QfOeUmtZfLAmmJXUYe6QvBW+uoH2Kb+tAQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-20 7:37 ` Christoph Hellwig [this message]
2017-10-20 7:37 ` Christoph Hellwig
2017-10-20 7:37 ` Christoph Hellwig
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 14:41 ` Jim Quinlan
2017-10-20 14:41 ` Jim Quinlan
2017-10-20 14:41 ` Jim Quinlan
2017-10-20 14:57 ` Christoph Hellwig
2017-10-20 14:57 ` Christoph Hellwig
2017-10-20 14:57 ` Christoph Hellwig
2017-10-20 14:57 ` Christoph Hellwig
2017-10-20 15:27 ` Jim Quinlan
2017-10-20 15:27 ` Jim Quinlan
2017-10-20 15:27 ` Jim Quinlan
2017-10-20 16:17 ` Christoph Hellwig
2017-10-20 16:17 ` Christoph Hellwig
2017-10-20 16:17 ` Christoph Hellwig
2017-10-20 16:17 ` Christoph Hellwig
[not found] ` <CANCKTBtxp9gSdndKAZ7xGA+VozQsn2PX_-9P8A22_5Matbb7-w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-23 9:06 ` David Laight
2017-10-23 9:06 ` David Laight
2017-10-23 9:06 ` David Laight
2017-10-23 9:06 ` David Laight
[not found] ` <063D6719AE5E284EB5DD2968C1650D6DD009F05A-VkEWCZq2GCInGFn1LkZF6NBPR1lH4CV8@public.gmane.org>
2017-10-24 18:08 ` Jim Quinlan
2017-10-24 18:08 ` Jim Quinlan
2017-10-24 18:08 ` Jim Quinlan
2017-10-24 18:08 ` Jim Quinlan
2017-10-25 9:36 ` David Laight
2017-10-25 9:36 ` David Laight
2017-10-25 9:36 ` David Laight
2017-10-25 9:36 ` David Laight
2017-10-11 22:34 ` [PATCH 6/9] PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for MIPS Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` [PATCH 7/9] PCI: host: brcmstb: add MSI capability Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` [PATCH 8/9] MIPS: BMIPS: add PCI bindings for 7425, 7435 Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
2017-10-11 22:34 ` [PATCH 9/9] MIPS: BMIPS: enable PCI Jim Quinlan
2017-10-11 22:34 ` Jim Quinlan
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