[PATCH v7 0/8] scsi: ufs: support LU Dedicated buffer mode for WriteBooster

[Stanley Chu]

Hi,
This patchset adds LU dedicated buffer mode support for WriteBooster.
In the meanwhile, enable WriteBooster capability on MediaTek UFS platforms.

v6 -> v7:
  - Add device descriptor length check in ufshcd_wb_probe() back to prevent out-of-boundary access in ufshcd_wb_probe()
  - Fix the check of device descriptor length (Avri Altman)
  - Provide a new ufs_fixup_device_setup() function to pack both device fixup methods by general quirk table and vendor-specific way (Avri Altman)

v5 -> v6:
  - Remove device descriptor length check in ufshcd_wb_probe()

v4 -> v5:
  - Check LUN ID for available WriteBooster buffer only from 0 to 7 according to spec (Avri Altman)
  - Skip checking any possible errors from ufshcd_read_unit_desc_param(hba, lun, UNIT_DESC_PARAM_WB_BUF_ALLOC_UNITS) in ufshcd_wb_probe() and check returned d_lu_wb_buf_alloc (shall be zero if error happens) (Avri Altman)

v3 -> v4:
  - Introduce "fixup_dev_quirks" vops to allow vendors to fix and modify device quirks, and provide an initial vendor-specific device quirk table on MediaTek UFS platforms
  - Avoid relying on common device quirk table for pre-3.1 UFS device with non-standard WriteBooster support (Can Guo)
  - Fix comments for ufshcd_wb_probe() (Can Guo)
  - Make ufshcd_wb_get_flag_index() inline and fix ufshcd_is_wb_flags() (Avri Altman)

v2 -> v3:
  - Introduce a device quirk to support WriteBooster in pre-3.1 UFS devices (Avri Altman)
  - Fix WriteBooster related sysfs nodes. Now all WriteBooster related sysfs nodes are specifically mapped to the LUN with WriteBooster enabled in LU Dedicated buffer mode (Avri Altman)

v1 -> v2:
  - Change the definition name of WriteBooster buffer mode to correspond to specification (Bean Huo)
  - Add patch #5: "scsi: ufs: cleanup WriteBooster feature"

Stanley Chu (8):
  scsi: ufs: enable WriteBooster on some pre-3.1 UFS devices
  scsi: ufs: introduce fixup_dev_quirks vops
  scsi: ufs: export ufs_fixup_device_setup() function
  scsi: ufs-mediatek: add fixup_dev_quirks vops
  scsi: ufs: add "index" in parameter list of ufshcd_query_flag()
  scsi: ufs: add LU Dedicated buffer mode support for WriteBooster
  scsi: ufs-mediatek: enable WriteBooster capability
  scsi: ufs: cleanup WriteBooster feature

 drivers/scsi/ufs/ufs-mediatek.c |  25 ++++-
 drivers/scsi/ufs/ufs-sysfs.c    |  11 ++-
 drivers/scsi/ufs/ufs.h          |  10 ++
 drivers/scsi/ufs/ufs_quirks.h   |   7 ++
 drivers/scsi/ufs/ufshcd.c       | 163 +++++++++++++++++++++-----------
 drivers/scsi/ufs/ufshcd.h       |  19 +++-
 6 files changed, 173 insertions(+), 62 deletions(-)

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2.18.0