linux-toradex.git/include/linux/nd.h, branch v4.17-rc1

libnvdimm: provide module_nd_driver wrapper

2018-03-15T14:17:21+00:00

Provide a module_nd_driver() wrapper over simple nd_driver_register()
nd_driver_unregister() combinations in module_init() and module_exit()
respectively.

Note an explicit nd_driver_unregister() had to be implemented as nd
bus drivers did call device_unregister() direcly in the module_exit()
function.

Signed-off-by: Johannes Thumshirn 
Signed-off-by: Dan Williams

libnvdimm, btt: BTT updates for UEFI 2.7 format

2017-06-29T20:50:38+00:00

The UEFI 2.7 specification defines an updated BTT metadata format,
bumping the revision to 2.0. Add support for the new format, while
retaining compatibility for the old 1.1 format.

Cc: Toshi Kani 
Cc: Linda Knippers 
Cc: Dan Williams 
Signed-off-by: Vishal Verma 
Signed-off-by: Dan Williams

libnvdimm, label: add address abstraction identifiers

2017-06-15T21:31:40+00:00

Starting with v1.2 labels, 'address abstractions' can be hinted via an
address abstraction id that implies an info-block format. The standard
address abstraction in the specification is the v2 format of the
Block-Translation-Table (BTT). Support for that is saved for a later
patch, for now we add support for the Linux supported address
abstractions BTT (v1), PFN, and DAX.

The new 'holder_class' attribute for namespace devices is added for
tooling to specify the 'abstraction_guid' to store in the namespace label.
For v1.1 labels this field is undefined and any setting of
'holder_class' away from the default 'none' value will only have effect
until the driver is unloaded. Setting 'holder_class' requires that
whatever device tries to claim the namespace must be of the specified
class.

Cc: Vishal Verma 
Signed-off-by: Dan Williams

libnvdimm, label: honor the lba size specified in v1.2 labels

2017-06-15T21:31:39+00:00

Previously we only honored the lba size for blk-aperture mode
namespaces. For pmem namespaces the lba size was just assumed to be 512.
With the new v1.2 label definition and compatibility with other
operating environments, the ->lbasize property is now respected for pmem
namespaces.

Cc: Ross Zwisler 
Signed-off-by: Dan Williams

libnvdimm: add an atomic vs process context flag to rw_bytes

2017-05-11T04:46:22+00:00

nsio_rw_bytes can clear media errors, but this cannot be done while we
are in an atomic context due to locking within ACPI. From the BTT,
->rw_bytes may be called either from atomic or process context depending
on whether the calls happen during initialization or during IO.

During init, we want to ensure error clearing happens, and the flag
marking process context allows nsio_rw_bytes to do that. When called
during IO, we're in atomic context, and error clearing can be skipped.

Cc: Dan Williams 
Signed-off-by: Vishal Verma 
Signed-off-by: Dan Williams

libnvdimm, namespace: sort namespaces by dpa at init

2016-10-07T16:20:53+00:00

Add more determinism to initial namespace device-name assignments by
sorting the namespaces by starting dpa.

Signed-off-by: Dan Williams

libnvdimm, namespace: allow multiple pmem-namespaces per region at scan time

2016-10-07T16:20:53+00:00

If label scanning finds multiple valid pmem namespaces allow them to be
surfaced rather than fail namespace scanning. Support for creating
multiple namespaces per region is saved for a later patch.

Note that this adds some new error messages to clarify which of the pmem
namespaces in the set are potentially impacted by invalid labels.

Signed-off-by: Dan Williams

pmem: kill __pmem address space

2016-07-13T02:25:38+00:00

The __pmem address space was meant to annotate codepaths that touch
persistent memory and need to coordinate a call to wmb_pmem().  Now that
wmb_pmem() is gone, there is little need to keep this annotation.

Cc: Christoph Hellwig 
Cc: Ross Zwisler 
Signed-off-by: Dan Williams

libnvdimm, pmem: flush posted-write queues on shutdown

2016-07-12T22:13:48+00:00

Commit writes to media on system shutdown or pmem driver unload.

Signed-off-by: Dan Williams

libnvdimm, pmem, pfn: make pmem_rw_bytes generic and refactor pfn setup

2016-04-22T19:26:23+00:00

In preparation for providing an alternative (to block device) access
mechanism to persistent memory, convert pmem_rw_bytes() to
nsio_rw_bytes().  This allows ->rw_bytes() functionality without
requiring a 'struct pmem_device' to be instantiated.

In other words, when ->rw_bytes() is in use i/o is driven through
'struct nd_namespace_io', otherwise it is driven through 'struct
pmem_device' and the block layer.  This consolidates the disjoint calls
to devm_exit_badblocks() and devm_memunmap() into a common
devm_nsio_disable() and cleans up the init path to use a unified
pmem_attach_disk() implementation.

Reviewed-by: Johannes Thumshirn 
Signed-off-by: Dan Williams