| # SPDX-License-Identifier: GPL-2.0-only |
| config DAX_DRIVER |
| select DAX |
| bool |
| |
| menuconfig DAX |
| tristate "DAX: direct access to differentiated memory" |
| select SRCU |
| default m if NVDIMM_DAX |
| |
| if DAX |
| |
| config DEV_DAX |
| tristate "Device DAX: direct access mapping device" |
| depends on TRANSPARENT_HUGEPAGE |
| help |
| Support raw access to differentiated (persistence, bandwidth, |
| latency...) memory via an mmap(2) capable character |
| device. Platform firmware or a device driver may identify a |
| platform memory resource that is differentiated from the |
| baseline memory pool. Mappings of a /dev/daxX.Y device impose |
| restrictions that make the mapping behavior deterministic. |
| |
| config DEV_DAX_PMEM |
| tristate "PMEM DAX: direct access to persistent memory" |
| depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX |
| default DEV_DAX |
| help |
| Support raw access to persistent memory. Note that this |
| driver consumes memory ranges allocated and exported by the |
| libnvdimm sub-system. |
| |
| Say M if unsure |
| |
| config DEV_DAX_KMEM |
| tristate "KMEM DAX: volatile-use of persistent memory" |
| default DEV_DAX |
| depends on DEV_DAX |
| depends on MEMORY_HOTPLUG # for add_memory() and friends |
| help |
| Support access to persistent memory as if it were RAM. This |
| allows easier use of persistent memory by unmodified |
| applications. |
| |
| To use this feature, a DAX device must be unbound from the |
| device_dax driver (PMEM DAX) and bound to this kmem driver |
| on each boot. |
| |
| Say N if unsure. |
| |
| config DEV_DAX_PMEM_COMPAT |
| tristate "PMEM DAX: support the deprecated /sys/class/dax interface" |
| depends on m && DEV_DAX_PMEM=m |
| default DEV_DAX_PMEM |
| help |
| Older versions of the libdaxctl library expect to find all |
| device-dax instances under /sys/class/dax. If libdaxctl in |
| your distribution is older than v58 say M, otherwise say N. |
| |
| endif |
