UFS Multi-Circular Queue (MCQ) has been added in UFSHCI v4.0 to improve storage performance. The implementation uses the shared tagging mechanism so that tags are shared among the hardware queues. The number of hardware queues is configurable. This series doesn't include the ESI implementation for completion handling. This implementation has been verified by booting on an emulation platform. During testing, all low power modes were disabled and it was in HS-G1 mode. Please take a look and let us know your thoughts. v2 -> v3: - Split ufshcd_config_mcq() into ufshcd_alloc_mcq() and ufshcd_config_mcq() - Use devm_kzalloc() in ufshcd_mcq_init() - Free memory and resource allocation on error paths - Corrected typos in code comments v1 -> v2: - Added a non MCQ related change to use a function to extrace ufs extended feature - Addressed Mani's comments - Addressed Bart's comments v1: - Split the changes - Addressed Bart's comments - Addressed Bean's comments * RFC versions: v2 -> v3: - Split the changes based on functionality - Addressed queue configuration issues - Faster SQE tail pointer increments - Addressed comments from Bart and Manivannan v1 -> v2: - Enabled host_tagset - Added queue num configuration support - Added one more vops to allow vendor provide the wanted MAC - Determine nutrs and can_queue by considering both MAC, bqueuedepth and EXT_IID support - Postponed MCQ initialization and scsi_add_host() to async probe - Used (EXT_IID, Task Tag) tuple to support up to 4096 tasks (theoretically) Asutosh Das (17): ufs: core: Probe for ext_iid support ufs: core: Optimize duplicate code to read extended feature ufs: core: Introduce Multi-circular queue capability ufs: core: Defer adding host to scsi if mcq is supported ufs: core: mcq: Introduce Multi Circular Queue ufs: core: mcq: Configure resource regions ufs: core: mcq: Calculate queue depth ufs: core: mcq: Allocate memory for mcq mode ufs: core: mcq: Configure operation and runtime interface ufs: core: mcq: Use shared tags for MCQ mode ufs: core: Prepare ufshcd_send_command for mcq ufs: core: mcq: Find hardware queue to queue request ufs: core: Prepare for completion in mcq ufs: mcq: Add completion support of a cqe ufs: core: mcq: Add completion support in poll ufs: core: mcq: Enable Multi Circular Queue ufs: qcom-host: Enable multi circular queue capability drivers/ufs/core/Makefile | 2 +- drivers/ufs/core/ufs-mcq.c | 498 +++++++++++++++++++++++++++++++++++++++++ drivers/ufs/core/ufshcd-priv.h | 84 ++++++- drivers/ufs/core/ufshcd.c | 353 +++++++++++++++++++++++------ drivers/ufs/host/ufs-qcom.c | 49 ++++ drivers/ufs/host/ufs-qcom.h | 4 + include/ufs/ufs.h | 6 + include/ufs/ufshcd.h | 136 +++++++++++ include/ufs/ufshci.h | 63 ++++++ 9 files changed, 1127 insertions(+), 68 deletions(-) create mode 100644 drivers/ufs/core/ufs-mcq.c -- 2.7.4
