[PULL][Disco] hisi_sas: add debugfs support

[dann frazier]

BugLink: https://bugs.launchpad.net/bugs/1819500

First patch required minor backporting, others are all clean cherry-picks.

The following changes since commit e92fc16621f9eab14fa8d76a0f8f43f76b8b6cc6:

  UBUNTU: [Config] CONFIG_TLS=n for i386 (2019-03-08 16:40:28 -0600)

are available in the Git repository at:

  git://git.launchpad.net/~dannf/ubuntu/+source/linux/+git/linux hisi-sas-debugfs

for you to fetch changes up to ab36d9784518988704d4845d193d26205488343d:

  scsi: hisi_sas: Add debugfs ITCT file and add file operations (2019-03-11 12:16:18 -0600)

----------------------------------------------------------------
John Garry (2):
      scsi: hisi_sas: No need to check return value of debugfs_create functions
      scsi: hisi_sas: Fix type casting and missing static qualifier in debugfs code

Luo Jiaxing (9):
      scsi: hisi_sas: Create root and device debugfs directories
      scsi: hisi_sas: Alloc debugfs snapshot buffer memory for all registers
      scsi: hisi_sas: Take debugfs snapshot for all regs
      scsi: hisi_sas: Debugfs global register create file and add file operations
      scsi: hisi_sas: Add debugfs for port registers
      scsi: hisi_sas: Add debugfs CQ file and add file operations
      scsi: hisi_sas: Add debugfs DQ file and add file operations
      scsi: hisi_sas: Add debugfs IOST file and add file operations
      scsi: hisi_sas: Add debugfs ITCT file and add file operations

 drivers/scsi/hisi_sas/hisi_sas.h       |  48 ++-
 drivers/scsi/hisi_sas/hisi_sas_main.c  | 521 +++++++++++++++++++++++++++++++++
 drivers/scsi/hisi_sas/hisi_sas_v2_hw.c |   9 +-
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 174 ++++++++++-
 4 files changed, 746 insertions(+), 6 deletions(-)