linux-kernel - Re: [PATCH V4] mmc: block: Add new ioctl to send multi commands

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Date:	Thu, 24 Sep 2015 00:26:24 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Grant Grundler <grundler@...gle.com>
Cc:	Jon Hunter <jonathanh@...dia.com>, Arnd Bergmann <arnd@...db.de>,
	Olof Johansson <olofj@...omium.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Seshagiri Holi <sholi@...dia.com>
Subject: Re: [PATCH V4] mmc: block: Add new ioctl to send multi commands

On 24 September 2015 at 00:06, Grant Grundler <grundler@...gle.com> wrote:
> On Wed, Sep 23, 2015 at 2:42 PM, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>> On 22 September 2015 at 11:27, Jon Hunter <jonathanh@...dia.com> wrote:
>>> Certain eMMC devices allow vendor specific device information to be read
>>> via a sequence of vendor commands. These vendor commands must be issued
>>> in sequence and an atomic fashion. One way to support this would be to
>>> add an ioctl function for sending a sequence of commands to the device
>>> atomically as proposed here. These multi commands are simple array of
>>> the existing mmc_ioc_cmd structure.
>>>
>>> The structure passed via the ioctl uses a __u64 type to specify the number
>>> of commands (so that the structure is aligned on a 64-bit boundary) and a
>>> zero length array as a header for list of commands to be issued. The
>>> maximum number of commands that can be sent is determined by
>>> MMC_IOC_MAX_CMDS (which defaults to 255 and should be more than
>>> sufficient).
>>>
>>> This based upon work by Seshagiri Holi <sholi@...dia.com>.
>>>
>>> Signed-off-by: Seshagiri Holi <sholi@...dia.com>
>>> Signed-off-by: Jon Hunter <jonathanh@...dia.com>
>>
>> Thanks, applied for next!
>
> Ulf,
> is the git repo visible publicly?

git://git.linaro.org/people/ulf.hansson/mmc.git

>
> Your linaro.org mmc.git seems to be stale and Chris Ball's tree on
> kernel.org is the only other mention of mmc I'm finding.

Chris' tree hasn't been used for a long time.

>
> cheers
> grant

Kind regards
Uffe
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