| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | # SPDX-License-Identifier: GPL-2.0-only |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | config DAX_DRIVER |
| 3 | select DAX |
| 4 | bool |
| 5 | |
| 6 | menuconfig DAX |
| 7 | tristate "DAX: direct access to differentiated memory" |
| 8 | select SRCU |
| 9 | default m if NVDIMM_DAX |
| 10 | |
| 11 | if DAX |
| 12 | |
| 13 | config DEV_DAX |
| 14 | tristate "Device DAX: direct access mapping device" |
| 15 | depends on TRANSPARENT_HUGEPAGE |
| 16 | help |
| 17 | Support raw access to differentiated (persistence, bandwidth, |
| 18 | latency...) memory via an mmap(2) capable character |
| 19 | device. Platform firmware or a device driver may identify a |
| 20 | platform memory resource that is differentiated from the |
| 21 | baseline memory pool. Mappings of a /dev/daxX.Y device impose |
| 22 | restrictions that make the mapping behavior deterministic. |
| 23 | |
| 24 | config DEV_DAX_PMEM |
| 25 | tristate "PMEM DAX: direct access to persistent memory" |
| 26 | depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX |
| 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 | |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 33 | Say M if unsure |
| 34 | |
| 35 | config 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 | |
| 51 | config DEV_DAX_PMEM_COMPAT |
| 52 | tristate "PMEM DAX: support the deprecated /sys/class/dax interface" |
| 53 | depends on m && DEV_DAX_PMEM=m |
| 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. |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 59 | |
| 60 | endif |