Commit cd9e9808 authored by Matias Bjørling's avatar Matias Bjørling Committed by Jens Axboe
Browse files

lightnvm: Support for Open-Channel SSDs 



Open-channel SSDs are devices that share responsibilities with the host
in order to implement and maintain features that typical SSDs keep
strictly in firmware. These include (i) the Flash Translation Layer
(FTL), (ii) bad block management, and (iii) hardware units such as the
flash controller, the interface controller, and large amounts of flash
chips. In this way, Open-channels SSDs exposes direct access to their
physical flash storage, while keeping a subset of the internal features
of SSDs.

LightNVM is a specification that gives support to Open-channel SSDs
LightNVM allows the host to manage data placement, garbage collection,
and parallelism. Device specific responsibilities such as bad block
management, FTL extensions to support atomic IOs, or metadata
persistence are still handled by the device.

The implementation of LightNVM consists of two parts: core and
(multiple) targets. The core implements functionality shared across
targets. This is initialization, teardown and statistics. The targets
implement the interface that exposes physical flash to user-space
applications. Examples of such targets include key-value store,
object-store, as well as traditional block devices, which can be
application-specific.

Contributions in this patch from:

  Javier Gonzalez <jg@lightnvm.io>
  Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
  Jesper Madsen <jmad@itu.dk>

Signed-off-by: default avatarMatias Bjørling <m@bjorling.me>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent b3975e94

Documentation/ioctl/ioctl-number.txt

+1 −0
Original line number Diff line number Diff line
@@ -149,6 +149,7 @@ Code Seq#(hex) Include File Comments 
'K'	all	linux/kd.h

'L'	00-1F	linux/loop.h		conflict!

'L'	10-1F	drivers/scsi/mpt2sas/mpt2sas_ctl.h	conflict!

'L'	20-2F	linux/lightnvm.h

'L'	E0-FF	linux/ppdd.h		encrypted disk device driver

					<http://linux01.gwdg.de/~alatham/ppdd.html>

'M'	all	linux/soundcard.h	conflict!

MAINTAINERS

+8 −0
Original line number Diff line number Diff line
@@ -6243,6 +6243,14 @@ F: drivers/nvdimm/pmem.c 
F:	include/linux/pmem.h

F:	arch/*/include/asm/pmem.h



LIGHTNVM PLATFORM SUPPORT

M:	Matias Bjorling <mb@lightnvm.io>

W:	http://github/OpenChannelSSD

S:	Maintained

F:	drivers/lightnvm/

F:	include/linux/lightnvm.h

F:	include/uapi/linux/lightnvm.h



LINUX FOR IBM pSERIES (RS/6000)

M:	Paul Mackerras <paulus@au.ibm.com>

W:	http://www.ibm.com/linux/ltc/projects/ppc

drivers/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -44,6 +44,8 @@ source "drivers/net/Kconfig" 


source "drivers/isdn/Kconfig"



source "drivers/lightnvm/Kconfig"



# input before char - char/joystick depends on it. As does USB.



source "drivers/input/Kconfig"

drivers/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ obj-$(CONFIG_NUBUS) += nubus/ 
obj-y				+= macintosh/

obj-$(CONFIG_IDE)		+= ide/

obj-$(CONFIG_SCSI)		+= scsi/

obj-$(CONFIG_NVM)		+= lightnvm/

obj-y				+= nvme/

obj-$(CONFIG_ATA)		+= ata/

obj-$(CONFIG_TARGET_CORE)	+= target/

drivers/lightnvm/Kconfig

0 → 100644
+28 −0
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#

# Open-Channel SSD NVM configuration

#



menuconfig NVM

	bool "Open-Channel SSD target support"

	depends on BLOCK

	help

	  Say Y here to get to enable Open-channel SSDs.



	  Open-Channel SSDs implement a set of extension to SSDs, that

	  exposes direct access to the underlying non-volatile memory.



	  If you say N, all options in this submenu will be skipped and disabled

	  only do this if you know what you are doing.



if NVM



config NVM_DEBUG

	bool "Open-Channel SSD debugging support"

	---help---

	Exposes a debug management interface to create/remove targets at:



	  /sys/module/lnvm/parameters/configure_debug



	It is required to create/remove targets without IOCTLs.



endif # NVM

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