The DAX drivers were missing sysfs ABI documentation entirely.  Add this
missing documentation for the sysfs ABI for DAX regions and Dax devices
in patch 1. Add a new ABI for toggling memmap_on_memory semantics in
patch 2.

The missing ABI was spotted in [1], this series is a split of the new
ABI additions behind the initial documentation creation.

[1]: https://lore.kernel.org/linux-cxl/651f27b728fef_ae7e7294b3@dwillia2-xfh.jf.intel.com.notmuch/

Cc: Dan Williams <dan.j.williams@intel.com>
Cc:  <linux-kernel@vger.kernel.org>
Cc:  <nvdimm@lists.linux.dev>
Cc:  <linux-cxl@vger.kernel.org>
To: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>

Changes in v2:
- Fix CC lists, patch 1/2 didn't get sent correctly in v1
- Link to v1: https://lore.kernel.org/r/20231206-vv-dax_abi-v1-0-474eb88e201c@intel.com

---
Vishal Verma (2):
      Documentatiion/ABI: Add ABI documentation for sys-bus-dax
      dax: add a sysfs knob to control memmap_on_memory behavior

 drivers/dax/bus.c                       |  40 ++++++++
 Documentation/ABI/testing/sysfs-bus-dax | 164 ++++++++++++++++++++++++++++++++
 2 files changed, 204 insertions(+)
---
base-commit: c4e1ccfad42352918810802095a8ace8d1c744c9
change-id: 20231025-vv-dax_abi-17a219c46076

Best regards,
-- 
Vishal Verma <vishal.l.verma@intel.com>