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 Do you have any updated version of this patch set, which have been verified on your platform? Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
