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From: Deven Balani <devenbalani@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: Ping-Pong Compatible DMA buffer chaining
Date: Mon, 26 Dec 2005 11:35:00 +0530	[thread overview]
Message-ID: <7a37e95e0512252205t68c6b6f6sfeedf3a75880fda9@mail.gmail.com> (raw)

Hi All!

I am developing a SATA Driver which is libata-complaint for ARM
platform for linux-2.4 kernels.

But I am facing these issues:
1) The SATA Host Controller supports a DMA Logic which has Ping Pong Buffers.
How Can I allocate a linear contiguous buffer and give it to the
Buffer Descriptors of the Host Controller. I believe consistent alloc
would help me in this regard. But How could I do a chaining of Buffers
in a Ping Pong Scenario which has Buffer Descriptors.
2) The libata is using Scatter-Gather List to send Device Identify
Command. Is it necessary to have a Scatter-Gather List for non-PCI ARM
platforms. Can I bypass this mechanism.

Thanks,
Deven

             reply	other threads:[~2005-12-26  6:05 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-12-26  6:05 Deven Balani [this message]
2006-01-03  1:08 ` Ping-Pong Compatible DMA buffer chaining Alan Cox
2006-01-04  5:28   ` Deven Balani
2006-01-04  8:43     ` Alan Cox

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