tjh.dev
Linux kernel mirror (for testing)
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kernel
os
linux
1config DAX_DRIVER
2 select DAX
3 bool
4
5menuconfig DAX
6 tristate "DAX: direct access to differentiated memory"
7 select SRCU
8 default m if NVDIMM_DAX
9
10if DAX
11
12config DEV_DAX
13 tristate "Device DAX: direct access mapping device"
14 depends on TRANSPARENT_HUGEPAGE
15 help
16 Support raw access to differentiated (persistence, bandwidth,
17 latency...) memory via an mmap(2) capable character
18 device. Platform firmware or a device driver may identify a
19 platform memory resource that is differentiated from the
20 baseline memory pool. Mappings of a /dev/daxX.Y device impose
21 restrictions that make the mapping behavior deterministic.
22
23config DEV_DAX_PMEM
24 tristate "PMEM DAX: direct access to persistent memory"
25 depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX
26 depends on m # until we can kill DEV_DAX_PMEM_COMPAT
27 default DEV_DAX
28 help
29 Support raw access to persistent memory. Note that this
30 driver consumes memory ranges allocated and exported by the
31 libnvdimm sub-system.
32
33 Say M if unsure
34
35config DEV_DAX_KMEM
36 tristate "KMEM DAX: volatile-use of persistent memory"
37 default DEV_DAX
38 depends on DEV_DAX
39 depends on MEMORY_HOTPLUG # for add_memory() and friends
40 help
41 Support access to persistent memory as if it were RAM. This
42 allows easier use of persistent memory by unmodified
43 applications.
44
45 To use this feature, a DAX device must be unbound from the
46 device_dax driver (PMEM DAX) and bound to this kmem driver
47 on each boot.
48
49 Say N if unsure.
50
51config DEV_DAX_PMEM_COMPAT
52 tristate "PMEM DAX: support the deprecated /sys/class/dax interface"
53 depends on DEV_DAX_PMEM
54 default DEV_DAX_PMEM
55 help
56 Older versions of the libdaxctl library expect to find all
57 device-dax instances under /sys/class/dax. If libdaxctl in
58 your distribution is older than v58 say M, otherwise say N.
59
60endif