Commit a75ee6ec authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 

Pull SCSI updates from James Bottomley:
 "This is primarily another round of driver updates (lpfc, bfa, fcoe,
  ipr) plus a new ufshcd driver.  There shouldn't be anything
  controversial in here (The final deletion of scsi proc_ops which
  caused some build breakage has been held over until the next merge
  window to give us more time to stabilise it).

  I'm afraid, with me moving continents at exactly the wrong time,
  anything submitted after the merge window opened has been held over to
  the next merge window."

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (63 commits)
  [SCSI] ipr: Driver version 2.5.3
  [SCSI] ipr: Increase alignment boundary of command blocks
  [SCSI] ipr: Increase max concurrent oustanding commands
  [SCSI] ipr: Remove unnecessary memory barriers
  [SCSI] ipr: Remove unnecessary interrupt clearing on new adapters
  [SCSI] ipr: Fix target id allocation re-use problem
  [SCSI] atp870u, mpt2sas, qla4xxx use pci_dev->revision
  [SCSI] fcoe: Drop the rtnl_mutex before calling fcoe_ctlr_link_up
  [SCSI] bfa: Update the driver version to 3.0.23.0
  [SCSI] bfa: BSG and User interface fixes.
  [SCSI] bfa: Fix to avoid vport delete hang on request queue full scenario.
  [SCSI] bfa: Move service parameter programming logic into firmware.
  [SCSI] bfa: Revised Fabric Assigned Address(FAA) feature implementation.
  [SCSI] bfa: Flash controller IOC pll init fixes.
  [SCSI] bfa: Serialize the IOC hw semaphore unlock logic.
  [SCSI] bfa: Modify ISR to process pending completions
  [SCSI] bfa: Add fc host issue lip support
  [SCSI] mpt2sas: remove extraneous sas_log_info messages
  [SCSI] libfc: fcoe_transport_create fails in single-CPU environment
  [SCSI] fcoe: reduce contention for fcoe_rx_list lock [v2]
  ...
parents c9651e70 69931694

Documentation/scsi/00-INDEX

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@@ -94,3 +94,5 @@ sym53c8xx_2.txt 
	- info on second generation driver for sym53c8xx based adapters

tmscsim.txt

	- info on driver for AM53c974 based adapters

ufs.txt

	- info on Universal Flash Storage(UFS) and UFS host controller driver.

Documentation/scsi/st.txt

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@@ -390,6 +390,10 @@ MTSETDRVBUFFER 
	     MT_ST_SYSV sets the SYSV semantics (mode)

	     MT_ST_NOWAIT enables immediate mode (i.e., don't wait for

	        the command to finish) for some commands (e.g., rewind)

	     MT_ST_NOWAIT_EOF enables immediate filemark mode (i.e. when

	        writing a filemark, don't wait for it to complete). Please

		see the BASICS note about MTWEOFI with respect to the

		possible dangers of writing immediate filemarks.

	     MT_ST_SILI enables setting the SILI bit in SCSI commands when

		reading in variable block mode to enhance performance when

		reading blocks shorter than the byte count; set this only

Documentation/scsi/ufs.txt

0 → 100644
+133 −0
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                       Universal Flash Storage

                       =======================





Contents

--------



1. Overview

2. UFS Architecture Overview

  2.1 Application Layer

  2.2 UFS Transport Protocol(UTP) layer

  2.3 UFS Interconnect(UIC) Layer

3. UFSHCD Overview

  3.1 UFS controller initialization

  3.2 UTP Transfer requests

  3.3 UFS error handling

  3.4 SCSI Error handling





1. Overview

-----------



Universal Flash Storage(UFS) is a storage specification for flash devices.

It is aimed to provide a universal storage interface for both

embedded and removable flash memory based storage in mobile

devices such as smart phones and tablet computers. The specification

is defined by JEDEC Solid State Technology Association. UFS is based

on MIPI M-PHY physical layer standard. UFS uses MIPI M-PHY as the

physical layer and MIPI Unipro as the link layer.



The main goals of UFS is to provide,

 * Optimized performance:

   For UFS version 1.0 and 1.1 the target performance is as follows,

   Support for Gear1 is mandatory (rate A: 1248Mbps, rate B: 1457.6Mbps)

   Support for Gear2 is optional (rate A: 2496Mbps, rate B: 2915.2Mbps)

   Future version of the standard,

   Gear3 (rate A: 4992Mbps, rate B: 5830.4Mbps)

 * Low power consumption

 * High random IOPs and low latency





2. UFS Architecture Overview

----------------------------



UFS has a layered communication architecture which is based on SCSI

SAM-5 architectural model.



UFS communication architecture consists of following layers,



2.1 Application Layer



  The Application layer is composed of UFS command set layer(UCS),

  Task Manager and Device manager. The UFS interface is designed to be

  protocol agnostic, however SCSI has been selected as a baseline

  protocol for versions 1.0 and 1.1 of UFS protocol  layer.

  UFS supports subset of SCSI commands defined by SPC-4 and SBC-3.

  * UCS: It handles SCSI commands supported by UFS specification.

  * Task manager: It handles task management functions defined by the

     UFS which are meant for command queue control.

  * Device manager: It handles device level operations and device

     configuration operations. Device level operations mainly involve

     device power management operations and commands to Interconnect

     layers. Device level configurations involve handling of query

     requests which are used to modify and retrieve configuration

     information of the device.



2.2 UFS Transport Protocol(UTP) layer



  UTP layer provides services for

  the higher layers through Service Access Points. UTP defines 3

  service access points for higher layers.

  * UDM_SAP: Device manager service access point is exposed to device

    manager for device level operations. These device level operations

    are done through query requests.

  * UTP_CMD_SAP: Command service access point is exposed to UFS command

    set layer(UCS) to transport commands.

  * UTP_TM_SAP: Task management service access point is exposed to task

    manager to transport task management functions.

  UTP transports messages through UFS protocol information unit(UPIU).



2.3 UFS Interconnect(UIC) Layer



  UIC is the lowest layer of UFS layered architecture. It handles

  connection between UFS host and UFS device. UIC consists of

  MIPI UniPro and MIPI M-PHY. UIC provides 2 service access points

  to upper layer,

  * UIC_SAP: To transport UPIU between UFS host and UFS device.

  * UIO_SAP: To issue commands to Unipro layers.





3. UFSHCD Overview

------------------



The UFS host controller driver is based on Linux SCSI Framework.

UFSHCD is a low level device driver which acts as an interface between

SCSI Midlayer and PCIe based UFS host controllers.



The current UFSHCD implementation supports following functionality,



3.1 UFS controller initialization



  The initialization module brings UFS host controller to active state

  and prepares the controller to transfer commands/response between

  UFSHCD and UFS device.



3.2 UTP Transfer requests



  Transfer request handling module of UFSHCD receives SCSI commands

  from SCSI Midlayer, forms UPIUs and issues the UPIUs to UFS Host

  controller. Also, the module decodes, responses received from UFS

  host controller in the form of UPIUs and intimates the SCSI Midlayer

  of the status of the command.



3.3 UFS error handling



  Error handling module handles Host controller fatal errors,

  Device fatal errors and UIC interconnect layer related errors.



3.4 SCSI Error handling



  This is done through UFSHCD SCSI error handling routines registered

  with SCSI Midlayer. Examples of some of the error handling commands

  issues by SCSI Midlayer are Abort task, Lun reset and host reset.

  UFSHCD Routines to perform these tasks are registered with

  SCSI Midlayer through .eh_abort_handler, .eh_device_reset_handler and

  .eh_host_reset_handler.



In this version of UFSHCD Query requests and power management

functionality are not implemented.



UFS Specifications can be found at,

UFS - http://www.jedec.org/sites/default/files/docs/JESD220.pdf

UFSHCI - http://www.jedec.org/sites/default/files/docs/JESD223.pdf

drivers/scsi/Kconfig

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@@ -619,6 +619,7 @@ config SCSI_ARCMSR 


source "drivers/scsi/megaraid/Kconfig.megaraid"

source "drivers/scsi/mpt2sas/Kconfig"

source "drivers/scsi/ufs/Kconfig"



config SCSI_HPTIOP

	tristate "HighPoint RocketRAID 3xxx/4xxx Controller support"

drivers/scsi/Makefile

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@@ -108,6 +108,7 @@ obj-$(CONFIG_MEGARAID_LEGACY) += megaraid.o 
obj-$(CONFIG_MEGARAID_NEWGEN)	+= megaraid/

obj-$(CONFIG_MEGARAID_SAS)	+= megaraid/

obj-$(CONFIG_SCSI_MPT2SAS)	+= mpt2sas/

obj-$(CONFIG_SCSI_UFSHCD)	+= ufs/

obj-$(CONFIG_SCSI_ACARD)	+= atp870u.o

obj-$(CONFIG_SCSI_SUNESP)	+= esp_scsi.o	sun_esp.o

obj-$(CONFIG_SCSI_GDTH)		+= gdth.o

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