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

[Asutosh Das]

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

-- 
2.7.4