[PATCH ndctl v1 00/10] daxctl: Support for sub-dividing soft-reserved regions

From: Joao Martins <joao.m.martins@oracle.com>
To: linux-nvdimm@lists.01.org
Cc: Dan Williams <dan.j.williams@intel.com>,
	Vishal Verma <vishal.l.verma@intel.com>
Subject: [PATCH ndctl v1 00/10] daxctl: Support for sub-dividing soft-reserved regions
Date: Fri,  3 Apr 2020 21:58:50 +0100	[thread overview]
Message-ID: <20200403205900.18035-1-joao.m.martins@oracle.com> (raw)

Hey,

This series introduces the daxctl support for sub-dividing soft-reserved 
regions created by EFI/HMAT/efi_fake_mem. It's the userspace counterpart
of this recent patch series [0].

These new 'dynamic' regions can be partitioned into multiple different devices
which its subdivisions can consist of one or more ranges. This
is in contrast to static dax regions -- created with ndctl-create-namespace
 -m devdax -- which can't be subdivided neither discontiguous. 
 See also cover-letter of [0].

The daxctl changes in these patches are depicted as:

 * {create,destroy,disable,enable}-device:

   These orchestrate/manage the sub-division devices.
   It mimmics the same as namespaces equivalent commands.

 * Allow reconfigure-device to change the size of an existing *dynamic* dax
 device.

 * Add test coverage (so far tried to cover all range allocation code paths,
 but I am still fishing for bugs). Additionally, there are bugs so applying 
 [0] may not make it pass the added functional test yet.

I am sending the series earlier (i.e. before the kernel patches get merged)
mainly to share a common unit tests, and also letting others try it out.

The only TODOs left is documentation, and perhaps listing of the mappingX sysfs
entries.

Thoughts, comments appreciated. :)

Thanks!
 Joao

[0] "device-dax: Support sub-dividing soft-reserved ranges",
https://lore.kernel.org/linux-nvdimm/158500767138.2088294.17131646259803932461.stgit@dwillia2-desk3.amr.corp.intel.com/

Dan Williams (1):
  daxctl: Cleanup whitespace

Joao Martins (9):
  libdaxctl: add daxctl_dev_set_size()
  daxctl: add resize support in reconfigure-device
  daxctl: add command to disable devdax device
  daxctl: add command to enable devdax device
  libdaxctl: add daxctl_region_create_dev()
  daxctl: add command to create device
  libdaxctl: add daxctl_region_destroy_dev()
  daxctl: add command to destroy device
  daxctl/test: Add tests for dynamic dax regions

 daxctl/builtin.h         |   4 +
 daxctl/daxctl.c          |   4 +
 daxctl/device.c          | 310 ++++++++++++++++++++++++++++++++++++++-
 daxctl/lib/libdaxctl.c   |  67 +++++++++
 daxctl/lib/libdaxctl.sym |   7 +
 daxctl/libdaxctl.h       |   3 +
 test/Makefile.am         |   1 +
 test/daxctl-create.sh    | 293 ++++++++++++++++++++++++++++++++++++
 util/filter.c            |   2 +-
 9 files changed, 686 insertions(+), 5 deletions(-)
 create mode 100755 test/daxctl-create.sh

-- 
2.17.1
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