scsi: ufs: add trace/debug support, sysfs controls and few fixes

This patch series adds following things:
- ftrace support to trace important events in UFS driver.
- debug dumps following failures to ease the debugging
- sysfs node to control clock gating, clock scaling and PM
- few fixes

---
Changes from v2 -> v3:

1. Patch #2: Used TRACE_DEFINE_ENUM to print out enums

2. Patch #11: Removed conditional compilation based on CONFIG_TRACEPOINTS and used trace_*_enabled() to skip unnecessary code path execution.

3. Patch #7: Simplified patch to just set the default power management level. Device tree capability to specify broken hardware will be taken up as separate patch in different patch series than current one.

1 & 2 should address Steven Rostedt's comments.

3 should address Rob Herring's comments.

Changes from v1 -> v2:
- Added explicit new line character at the end of the printk messages for patch #1 & #12
- Fixed couple of checkpatch warnings for patch #1
---

Dolev Raviv (3):
scsi: ufs: dump debug info during failures
scsi: ufs: fix multiple ufs spec violation
scsi: ufs: Improve fatal error logs

Lee Susman (1):
scsi: ufs: add trace event for ufs commands

Sahitya Tummala (2):
scsi: ufs: Add sysfs node to dynamically control clock gating
scsi: ufs: Add sysfs node to dynamically control clock scaling

Subhash Jadavani (6):
scsi: ufs: add tracing support
scsi: ufs: provide sysfs attribute to select the PM level
scsi: ufs: set default UFS power management level
scsi: ufs: add capability to keep auto bkops always enabled
scsi: ufs: fix setting init power mode
scsi: ufs: add time profiling support

 drivers/scsi/ufs/ufshcd.c  | 785 +++++++++++++++++++++++++++++++++++++++++----
 drivers/scsi/ufs/ufshcd.h  |  70 +++-
 drivers/scsi/ufs/ufshci.h  |   3 +
 include/trace/events/ufs.h | 263 +++++++++++++++
 4 files changed, 1066 insertions(+), 55 deletions(-)
 create mode 100644 include/trace/events/ufs.h

The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Subhash> This patch series adds following things:

Subhash>  - ftrace support to trace important events in UFS driver.
Subhash>  - debug dumps following failures to ease the debugging
Subhash>  - sysfs node to control clock gating, clock scaling and PM
Subhash>  - few fixes

Applied to 4.11/scsi-queue.

Martin K. Petersen	Oracle Linux Engineering