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: 43+ 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 ` [PATCH 1/9] SOC: brcmstb: add memory API Jim Quinlan
2017-10-12 14:41 ` Julien Thierry
2017-10-12 16:53 ` Florian Fainelli
2017-10-17 8:24 ` Christoph Hellwig
2017-10-17 16:12 ` Florian Fainelli
2017-10-18 6:46 ` Christoph Hellwig
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
2017-10-12 0:55 ` Brian Norris
2017-10-12 17:52 ` Jim Quinlan
2017-10-17 20:24 ` Rob Herring
2017-10-17 22:42 ` Jim Quinlan
2017-10-19 21:49 ` Rob Herring
2017-10-19 21:58 ` Florian Fainelli
2017-10-20 17:27 ` Brian Norris
2017-10-20 21:39 ` Rob Herring
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 ` [PATCH 4/9] arm64: dma-mapping: export symbol arch_setup_dma_ops Jim Quinlan
2017-10-12 17:06 ` Robin Murphy
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
2017-10-12 18:04 ` Robin Murphy
2017-10-12 21:43 ` Jim Quinlan
2017-10-17 8:14 ` Christoph Hellwig
2017-10-17 16:11 ` Jim Quinlan
2017-10-18 6:53 ` Christoph Hellwig
2017-10-18 14:41 ` Jim Quinlan
2017-10-19 9:16 ` Christoph Hellwig
2017-10-19 22:47 ` Jim Quinlan
2017-10-20 7:37 ` Christoph Hellwig [this message]
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
2017-10-23 9:06 ` David Laight
2017-10-24 18:08 ` Jim Quinlan
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 ` [PATCH 7/9] PCI: host: brcmstb: add MSI capability 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 ` [PATCH 9/9] MIPS: BMIPS: enable PCI Jim Quinlan
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