From: davem@davemloft.net (David Miller)
To: linux-arm-kernel@lists.infradead.org
Subject: DMA using data buffer vmapped in kernel space
Date: Tue, 09 Mar 2010 01:29:35 -0800 (PST) [thread overview]
Message-ID: <20100309.012935.98310472.davem@davemloft.net> (raw)
In-Reply-To: <20100309091403.GB5691@n2100.arm.linux.org.uk>
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Date: Tue, 9 Mar 2010 09:14:03 +0000
> What you could do is prepare a patch to allow the firmware support to
> export a scatterlist via the struct firmware, and then use that with
> dma_map_sg(). Let's hope that the SPI interfaces support scatterlists.
It's so common to want a scatterlist from a vmalloc/vmap area
that a generic common helper is probably the best.
Just iterate over the vmalloc/vmap area using vmalloc_to_page()
to fill in the SG entries.
next prev parent reply other threads:[~2010-03-09 9:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-04 21:11 DMA using data buffer vmapped in kernel space Thomas Koeller
2010-03-04 21:36 ` Russell King - ARM Linux
2010-03-06 13:07 ` Thomas Koeller
2010-03-06 19:31 ` Russell King - ARM Linux
2010-03-09 7:45 ` Lin Mac
2010-03-09 9:14 ` Russell King - ARM Linux
2010-03-09 9:29 ` David Miller [this message]
2010-03-09 10:16 ` Russell King - ARM Linux
2010-03-09 10:20 ` David Miller
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