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(-) -- 1.8.2.1 The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project -- 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
