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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb 
 kernel/drivers/dax/Kconfig
....@@ -1,3 +1,4 @@
1
+# SPDX-License-Identifier: GPL-2.0-only
12 config DAX_DRIVER
23 	select DAX
34 	bool
....@@ -29,6 +30,53 @@
2930 	  driver consumes memory ranges allocated and exported by the
3031 	  libnvdimm sub-system.
3132 
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-	  Say Y if unsure
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+	  Say M if unsure
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+
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+config DEV_DAX_HMEM
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+	tristate "HMEM DAX: direct access to 'specific purpose' memory"
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+	depends on EFI_SOFT_RESERVE
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+	select NUMA_KEEP_MEMINFO if (NUMA && X86)
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+	default DEV_DAX
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+	help
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+	  EFI 2.8 platforms, and others, may advertise 'specific purpose'
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+	  memory. For example, a high bandwidth memory pool. The
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+	  indication from platform firmware is meant to reserve the
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+	  memory from typical usage by default. This driver creates
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+	  device-dax instances for these memory ranges, and that also
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+	  enables the possibility to assign them to the DEV_DAX_KMEM
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+	  driver to override the reservation and add them to kernel
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+	  "System RAM" pool.
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+
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+	  Say M if unsure.
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+
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+config DEV_DAX_HMEM_DEVICES
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+	depends on DEV_DAX_HMEM && DAX=y
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+	def_bool y
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+
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+config DEV_DAX_KMEM
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+	tristate "KMEM DAX: volatile-use of persistent memory"
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+	default DEV_DAX
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+	depends on DEV_DAX
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+	depends on MEMORY_HOTPLUG # for add_memory() and friends
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+	help
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+	  Support access to persistent, or other performance
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+	  differentiated memory as if it were System RAM. This allows
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+	  easier use of persistent memory by unmodified applications, or
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+	  adds core kernel memory services to heterogeneous memory types
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+	  (HMEM) marked "reserved" by platform firmware.
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+
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+	  To use this feature, a DAX device must be unbound from the
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+	  device_dax driver and bound to this kmem driver on each boot.
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+
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+	  Say N if unsure.
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+
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+config DEV_DAX_PMEM_COMPAT
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+	tristate "PMEM DAX: support the deprecated /sys/class/dax interface"
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+	depends on m && DEV_DAX_PMEM=m
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+	default DEV_DAX_PMEM
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+	help
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+	  Older versions of the libdaxctl library expect to find all
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+	  device-dax instances under /sys/class/dax. If libdaxctl in
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+	  your distribution is older than v58 say M, otherwise say N.
3381 
3482 endif