ndtest: fix typo class_regster -> class_register

Fixes: dd6cad2dcb58 ("testing: nvdimm: make struct class structures constant")
Signed-off-by: Yi Zhang <yi.zhang@redhat.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20231127040026.362729-1-yi.zhang@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

testing: nvdimm: make struct class structures constant

Now that the driver core allows for struct class to be in read-only
memory, we should make all 'class' structures declared at build time
placing them into read-only memory, instead of having to be dynamically
allocated at runtime.

Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/2023100611-platinum-galleria-ceb3@gregkh
Signed-off-by: Ira Weiny <ira.weiny@intel.com>

driver core: class: remove module * from class_create()

The module pointer in class_create() never actually did anything, and it
shouldn't have been requred to be set as a parameter even if it did
something. So just remove it and fix up all callers of the function in
the kernel tree at the same time.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20230313181843.1207845-4-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

ndtest: Cleanup all of blk namespace specific code

With the nd_namespace_blk and nd_blk_region infrastructures being removed,
the ndtest still has some references to the old code. So the
compilation fails as below,

../tools/testing/nvdimm/test/ndtest.c:204:25: error: ‘ND_DEVICE_NAMESPACE_BLK’ undeclared here (not in a function); did you mean ‘ND_DEVICE_NAMESPACE_IO’?
204 | .type = ND_DEVICE_NAMESPACE_BLK,
| ^~~~~~~~~~~~~~~~~~~~~~~
| ND_DEVICE_NAMESPACE_IO
../tools/testing/nvdimm/test/ndtest.c: In function ‘ndtest_create_region’:
../tools/testing/nvdimm/test/ndtest.c:630:17: error: ‘ndbr_desc’ undeclared (first use in this function); did you mean ‘ndr_desc’?
630 | ndbr_desc.enable = ndtest_blk_region_enable;
| ^~~~~~~~~
| ndr_desc
../tools/testing/nvdimm/test/ndtest.c:630:17: note: each undeclared identifier is reported only once for each function it appears in
../tools/testing/nvdimm/test/ndtest.c:630:36: error: ‘ndtest_blk_region_enable’ undeclared (first use in this function)
630 | ndbr_desc.enable = ndtest_blk_region_enable;
| ^~~~~~~~~~~~~~~~~~~~~~~~
../tools/testing/nvdimm/test/ndtest.c:631:35: error: ‘ndtest_blk_do_io’ undeclared (first use in this function); did you mean ‘ndtest_blk_mmio’?
631 | ndbr_desc.do_io = ndtest_blk_do_io;
| ^~~~~~~~~~~~~~~~
| ndtest_blk_mmio

The current patch removes the specific code to cleanup all obsolete
references.

Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Link: https://lore.kernel.org/r/165763940218.3501174.7103619358744815702.stgit@ltc-boston123.aus.stglabs.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

nvdimm/region: Delete nd_blk_region infrastructure

Now that the nd_namespace_blk infrastructure is removed, delete all the
region machinery to coordinate provisioning aliased capacity between
PMEM and BLK.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/164688418803.2879318.1302315202397235855.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

dax: Kill DEV_DAX_PMEM_COMPAT

The /sys/class/dax compatibility option has shipped in the kernel for 4
years now which should be sufficient time for tools to abandon the old
ABI in favor of the /sys/bus/dax device-model. Delete it now and see if
anyone screams.

Since this compatibility option shipped there has been more reports of
users being surprised by the compat ABI than surprised by the "new", so
the compat infrastructure has outlived its usefulness. Recall that
/sys/bus/dax device-model is required for the dax kmem driver which
allows PMEM to be used as "System RAM".

The following projects were known to have a dependency on /sys/class/dax
and have dropped their dependency as of the listed version:

- ndctl (including libndctl, daxctl, and libdaxctl): v64+
- fio: v3.13+
- pmdk: v1.5.2+

As further evidence this option is no longer needed some distributions
have already stopped enabling CONFIG_DEV_DAX_PMEM_COMPAT.

Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Reported-by: Vishal Verma <vishal.l.verma@intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Jane Chu <jane.chu@oracle.com>
Link: https://lore.kernel.org/r/163701116195.3784476.726128179293466337.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

ndtest: Add papr health related flags

sysfs attibutes to show health related flags are added.

Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Link: https://lore.kernel.org/r/20201222042240.2983755-8-santosh@fossix.org
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

ndtest: Add nvdimm control functions

Add functions to support ND_CMD_GET_CONFIG_SIZE, ND_CMD_SET_CONFIG_DATA and
ND_CMD_GET_CONFIG_DATA.

Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Link: https://lore.kernel.org/r/20201222042240.2983755-7-santosh@fossix.org
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

ndtest: Add regions and mappings to the test buses

The bus config array is used to hold the regions and the respective
mappings. This config based interface enables to change the
dimm/region/namespace layouts easily.

Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Link: https://lore.kernel.org/r/20201222042240.2983755-6-santosh@fossix.org
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

ndtest: Add dimm attributes

This patch adds sysfs attributes for nvdimm and the dimm device.

Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Link: https://lore.kernel.org/r/20201222042240.2983755-5-santosh@fossix.org
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

ndtest: Add dimms to the two buses

A config array is used to hold the dimms for each bus. These dimms are
registered with nvdimm, and new nvdimms are created on the buses.

Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Link: https://lore.kernel.org/r/20201222042240.2983755-4-santosh@fossix.org
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

ndtest: Add compatability string to treat it as PAPR family

Since this module is written to be platform agnostic, the module is made
part of the PAPR_FAMILY. ndctl identifies the family using the compatible
string inside of_node dir-entry.

Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Link: https://lore.kernel.org/r/20201222042240.2983755-3-santosh@fossix.org
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

testing/nvdimm: Add test module for non-nfit platforms

The current test module cannot be used for testing platforms (make check)
that do not have support for NFIT. In order to get the ndctl tests working,
we need a module which can emulate NVDIMM devices without relying on
ACPI/NFIT.

The aim of this proposed module is to implement a similar functionality to
the existing module but without the ACPI dependencies.

This RFC series is split into reviewable and compilable chunks.

This patch adds a new driver and registers two nvdimm bus needed for ndctl
make check.

Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Link: https://lore.kernel.org/r/20201222042240.2983755-2-santosh@fossix.org
Signed-off-by: Dan Williams <dan.j.williams@intel.com>