projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
| 2080e88a DW |
2 | config DAX_DRIVER |
| 3 | select DAX | |
| 4 | bool | |
| 5 | ||
| 7b6be844 | 6 | menuconfig DAX |
| ab68f262 | 7 | tristate "DAX: direct access to differentiated memory" |
| 7b6be844 | 8 | select SRCU |
| ab68f262 | 9 | default m if NVDIMM_DAX |
| 7b6be844 DW |
10 | |
| 11 | if DAX | |
| 12 | ||
| 13 | config DEV_DAX | |
| 14 | tristate "Device DAX: direct access mapping device" | |
| dee41079 | 15 | depends on TRANSPARENT_HUGEPAGE |
| ab68f262 DW |
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 | ||
| ab68f262 DW |
24 | config DEV_DAX_PMEM |
| 25 | tristate "PMEM DAX: direct access to persistent memory" | |
| 74d71a01 | 26 | depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX |
| ab68f262 DW |
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 | ||
| 730926c3 DW |
33 | Say M if unsure |
| 34 | ||
| c221c0b0 DH |
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 | ||
| 730926c3 DW |
51 | config DEV_DAX_PMEM_COMPAT |
| 52 | tristate "PMEM DAX: support the deprecated /sys/class/dax interface" | |
| 67476656 | 53 | depends on m && DEV_DAX_PMEM=m |
| 730926c3 DW |
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. | |
| ab68f262 DW |
59 | |
| 60 | endif |