Re: [RFC PATCH 0/4] Command Queueing Support in eMMC

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On Fri, Dec 4, 2015 at 12:40 PM, Das, Asutosh (asd)
<asutoshd@xxxxxxxxxxxxxx> wrote:
> + Kostya
> Hi Aisheng,
> Yes, a colleague of mine is working on upstreaming it. It should be done
> within a week or so.
>

Great! Thanks!
Looking forward to it.

Regards
Dong Aisheng

>
> On 12/3/2015 9:12 AM, Dong Aisheng wrote:
>>
>> Hi Asutosh,
>>
>> On Tue, Dec 2, 2014 at 7:53 PM, Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
>> wrote:
>>>
>>> In this patch series, we propose a method to add support for
>>> Command Queueing(CQ) feature added to eMMC-5.1 specification.
>>> This feature includes new commands for issuing tasks to the
>>> device and orders the execution of tasks to the device. It
>>> also has task management functions.
>>>
>>> The initialization of CQ is decided based on the underlying
>>> driver capability and the capability advertised by the card
>>> through ext_csd.
>>>
>>> We have selectively adopted the scsi design of pulling in
>>> requests from kernel block layer.
>>>
>>> In order to support queueing of multiple requests, we have
>>> added a new issue function to mmc-queue. This selectively
>>> pulls the requests and prepares and issues it to the underlying
>>> driver. We have used the inherent tagging mechanism of kernel
>>> block layer to keep track and map tags to the slots of underlying
>>> driver. The current design doesn't block for the request to
>>> complete. We have separated the issuing and completion path
>>> of the request and tracking is done using the tag assigned to
>>> the request.
>>>
>>> We have introduced a number of APIs to mmc block layer to
>>> facilitate servicing of requests.
>>>
>>> The completion of requests is handled in a softirq registered
>>> with the kernel block layer during initialization. The error
>>> handling however would be done using a workqueue and is under
>>> development.
>>>
>>> We have separated the legacy eMMC code from CQ code, so as to
>>> make it more manageable.
>>>
>>> A new layer has been introduced to serve the CQ compliant drivers.
>>> This layer (cq_hci) has all the standard functionality implemented.
>>> It also has necessary hooks for convenience of platform drivers.
>>>
>>> Asutosh Das (4):
>>>    mmc: queue: initialization of command-queue support
>>>    mmc: card: Add eMMC command queuing support in mmc block layer
>>>    mmc: cmdq: support for command queue enabled host
>>>    mmc: sdhci: add command queue support to sdhci
>>>
>>> Sujit Reddy Thumma (1):
>>>    mmc: core: Add support to read command queue parameters
>>>
>>>   drivers/mmc/card/block.c   | 378
>>> ++++++++++++++++++++++++++++++++++++++++++++-
>>>   drivers/mmc/card/queue.c   | 160 ++++++++++++++++++-
>>>   drivers/mmc/card/queue.h   |   9 +-
>>>   drivers/mmc/core/core.c    |  87 +++++++++++
>>>   drivers/mmc/core/mmc.c     |  19 +++
>>>   drivers/mmc/core/mmc_ops.c |  45 ++++--
>>>   drivers/mmc/host/Kconfig   |  12 ++
>>>   drivers/mmc/host/Makefile  |   1 +
>>>   drivers/mmc/host/sdhci.c   |  89 +++++++++++
>>>   drivers/mmc/host/sdhci.h   |   2 +
>>>   include/linux/mmc/card.h   |  10 +-
>>>   include/linux/mmc/core.h   |  14 ++
>>>   include/linux/mmc/host.h   |  72 +++++++++
>>>   include/linux/mmc/mmc.h    |   9 ++
>>>   include/linux/mmc/sdhci.h  |   1 +
>>>   15 files changed, 887 insertions(+), 21 deletions(-)
>>>
>> Are you still working on this?
>> Is there a updated version and any upstream plan?
>> I'm going to verify it.
>>
>> Regards
>> Dong Aisheng
>>
>>> --
>>> 1.8.2.1
>>>
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>>> a Linux Foundation Collaborative Project
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