From: Asutosh Das <asutoshd@codeaurora.org>
To: drzeus@drzeus.cx, linux-mmc@vger.kernel.org
Subject: Re: Query regarding ADMA descriptor allocation
Date: Sun, 13 Jan 2013 17:50:31 +0530 [thread overview]
Message-ID: <50F2A68F.4000206@codeaurora.org> (raw)
In-Reply-To: <50F0061F.6070509@codeaurora.org>
Hi
Can you please let me know if my understanding in the below question is
correct ?
Thanks
Asutosh
On 1/11/2013 6:01 PM, Asutosh Das wrote:
> Hi
> In sdhci_add_host function, the number of adma descriptors allocated
> are 128 and each descriptor consumes 8 bytes and 1 4byte is added in
> the end like,
> kmalloc((128 * 2 + 1) * 4, GFP_KERNEL);
>
> In sdhci_adma_table_pre function, each node in sg-list is iterated and
> in case of a misaligned node, a descriptor is consumed, which means
> for a single sg-node 2 descriptors were consumed. Let's say in a
> situation, where there are multiple unaligned addresses in multiple sg
> nodes and the sg-list length is 128, wouldn't this use up all the 128
> descriptors long before the entire sg-list is traversed ?
>
>
>
>
--
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
next prev parent reply other threads:[~2013-01-13 12:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-11 12:31 Query regarding ADMA descriptor allocation Asutosh Das
2013-01-13 12:20 ` Asutosh Das [this message]
2013-01-15 15:16 ` Subhash Jadavani
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