libnvdimm: Non-Volatile Devices (bc30196f) · Commits · 戴 / test

Documentation/nvdimm/btt.txt

+17 −7

Original line number	Diff line number	Diff line
		@@ -80,8 +80,16 @@ block. Each map entry is 32 bits. The two most significant bits are special
		flags, and the remaining form the internal block number.

		Bit Description
		31 : TRIM flag - marks if the block was trimmed or discarded
		30 : ERROR flag - marks an error block. Cleared on write.
		31 - 30 : Error and Zero flags - Used in the following way:
		Bit Description
		31 30
		-----------------------------------------------------------------------
		00 Initial state. Reads return zeroes; Premap = Postmap
		01 Zero state: Reads return zeroes
		10 Error state: Reads fail; Writes clear 'E' bit
		11 Normal Block – has valid postmap


		29 - 0 : Mappings to internal 'postmap' blocks


		@@ -127,10 +135,11 @@ old_map': alternate old postmap entry
		new_map': alternate new postmap entry
		seq' : alternate sequence number.

		Each of the above fields is 32-bit, making one entry 16 bytes. Flog updates are
		Each of the above fields is 32-bit, making one entry 32 bytes. Entries are also
		padded to 64 bytes to avoid cache line sharing or aliasing. Flog updates are
		done such that for any entry being written, it:
		a. overwrites the 'old' section in the entry based on sequence numbers
		b. writes the new entry such that the sequence number is written last.
		b. writes the 'new' section such that the sequence number is written last.


		c. The concept of lanes
		@@ -141,8 +150,9 @@ concurrently, 'nlanes' is the number of IOs the BTT device as a whole can
		process.
		nlanes = min(nfree, num_cpus)
		A lane number is obtained at the start of any IO, and is used for indexing into
		all the on-disk and in-memory data structures for the duration of the IO. It is
		protected by a spinlock.
		all the on-disk and in-memory data structures for the duration of the IO. If
		there are more CPUs than the max number of available lanes, than lanes are
		protected by spinlocks.


		d. In-memory data structure: Read Tracking Table (RTT)

Documentation/nvdimm/nvdimm.txt

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+808 −0

File added.

Preview size limit exceeded, changes collapsed.

MAINTAINERS

+33 −6

Original line number	Diff line number	Diff line
		@@ -5912,6 +5912,39 @@ M: Sasha Levin <sasha.levin@oracle.com>
		S: Maintained
		F: tools/lib/lockdep/

		LIBNVDIMM: NON-VOLATILE MEMORY DEVICE SUBSYSTEM
		M: Dan Williams <dan.j.williams@intel.com>
		L: linux-nvdimm@lists.01.org
		Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
		S: Supported
		F: drivers/nvdimm/*
		F: include/linux/nd.h
		F: include/linux/libnvdimm.h
		F: include/uapi/linux/ndctl.h

		LIBNVDIMM BLK: MMIO-APERTURE DRIVER
		M: Ross Zwisler <ross.zwisler@linux.intel.com>
		L: linux-nvdimm@lists.01.org
		Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
		S: Supported
		F: drivers/nvdimm/blk.c
		F: drivers/nvdimm/region_devs.c
		F: drivers/acpi/nfit*

		LIBNVDIMM BTT: BLOCK TRANSLATION TABLE
		M: Vishal Verma <vishal.l.verma@intel.com>
		L: linux-nvdimm@lists.01.org
		Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
		S: Supported
		F: drivers/nvdimm/btt*

		LIBNVDIMM PMEM: PERSISTENT MEMORY DRIVER
		M: Ross Zwisler <ross.zwisler@linux.intel.com>
		L: linux-nvdimm@lists.01.org
		Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
		S: Supported
		F: drivers/nvdimm/pmem.c

		LINUX FOR IBM pSERIES (RS/6000)
		M: Paul Mackerras <paulus@au.ibm.com>
		W: http://www.ibm.com/linux/ltc/projects/ppc
		@@ -8136,12 +8169,6 @@ S: Maintained
		F: Documentation/blockdev/ramdisk.txt
		F: drivers/block/brd.c

		PERSISTENT MEMORY DRIVER
		M: Ross Zwisler <ross.zwisler@linux.intel.com>
		L: linux-nvdimm@lists.01.org
		S: Supported
		F: drivers/block/pmem.c

		RANDOM NUMBER DRIVER
		M: "Theodore Ts'o" <tytso@mit.edu>
		S: Maintained

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