From: Subhash Jadavani <subhashj@codeaurora.org>
To: Asutosh Das <asutoshd@codeaurora.org>, Chris Ball <cjb@laptop.org>
Cc: drzeus@drzeus.cx, linux-mmc@vger.kernel.org
Subject: Re: Query regarding ADMA descriptor allocation
Date: Tue, 15 Jan 2013 20:46:16 +0530 [thread overview]
Message-ID: <50F572C0.2090502@codeaurora.org> (raw)
In-Reply-To: <50F2A68F.4000206@codeaurora.org>
Hi Chris,
Can anyone from SDHCi confirm if the understanding below is correct or
not? If it is than we can post a patch to fix it.
Regards,
Subhash
On 1/13/2013 5:50 PM, Asutosh Das wrote:
> 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 ?
>>
>>
>>
>>
>
>
prev parent reply other threads:[~2013-01-15 15:16 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
2013-01-15 15:16 ` Subhash Jadavani [this message]
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