[PATCH v1 00/16] Add Multi Circular Queue Support

Asutosh Das
2022-09-23T01:06:59Z

UFS Multi-Circular Queue (MCQ) has been added in UFSHCI v4.0 to improve storage performance.
This patch series is a RFC implementation of this.

This is the initial driver implementation and it 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.

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 (16):
ufs: core: Probe for ext_iid support
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 | 511 +++++++++++++++++++++++++++++++++++++++++
drivers/ufs/core/ufshcd-priv.h | 84 ++++++-
drivers/ufs/core/ufshcd.c | 322 +++++++++++++++++++++-----
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, 1117 insertions(+), 60 deletions(-)
create mode 100644 drivers/ufs/core/ufs-mcq.c

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2.7.4