1*ec8f24b7SThomas Gleixner# SPDX-License-Identifier: GPL-2.0-only 22080e88aSDan Williamsconfig DAX_DRIVER 32080e88aSDan Williams select DAX 42080e88aSDan Williams bool 52080e88aSDan Williams 67b6be844SDan Williamsmenuconfig DAX 7ab68f262SDan Williams tristate "DAX: direct access to differentiated memory" 8956a4cd2SDan Williams select SRCU 97b6be844SDan Williams default m if NVDIMM_DAX 107b6be844SDan Williams 117b6be844SDan Williamsif DAX 127b6be844SDan Williams 137b6be844SDan Williamsconfig DEV_DAX 147b6be844SDan Williams tristate "Device DAX: direct access mapping device" 157b6be844SDan Williams depends on TRANSPARENT_HUGEPAGE 16ab68f262SDan Williams help 17ab68f262SDan Williams Support raw access to differentiated (persistence, bandwidth, 18ab68f262SDan Williams latency...) memory via an mmap(2) capable character 19ab68f262SDan Williams device. Platform firmware or a device driver may identify a 20ab68f262SDan Williams platform memory resource that is differentiated from the 21ab68f262SDan Williams baseline memory pool. Mappings of a /dev/daxX.Y device impose 22ab68f262SDan Williams restrictions that make the mapping behavior deterministic. 23ab68f262SDan Williams 24ab68f262SDan Williamsconfig DEV_DAX_PMEM 25ab68f262SDan Williams tristate "PMEM DAX: direct access to persistent memory" 2674d71a01SMike Galbraith depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX 27ab68f262SDan Williams default DEV_DAX 28ab68f262SDan Williams help 29ab68f262SDan Williams Support raw access to persistent memory. Note that this 30ab68f262SDan Williams driver consumes memory ranges allocated and exported by the 31ab68f262SDan Williams libnvdimm sub-system. 32ab68f262SDan Williams 33730926c3SDan Williams Say M if unsure 34730926c3SDan Williams 35c221c0b0SDave Hansenconfig DEV_DAX_KMEM 36c221c0b0SDave Hansen tristate "KMEM DAX: volatile-use of persistent memory" 37c221c0b0SDave Hansen default DEV_DAX 38c221c0b0SDave Hansen depends on DEV_DAX 39c221c0b0SDave Hansen depends on MEMORY_HOTPLUG # for add_memory() and friends 40c221c0b0SDave Hansen help 41c221c0b0SDave Hansen Support access to persistent memory as if it were RAM. This 42c221c0b0SDave Hansen allows easier use of persistent memory by unmodified 43c221c0b0SDave Hansen applications. 44c221c0b0SDave Hansen 45c221c0b0SDave Hansen To use this feature, a DAX device must be unbound from the 46c221c0b0SDave Hansen device_dax driver (PMEM DAX) and bound to this kmem driver 47c221c0b0SDave Hansen on each boot. 48c221c0b0SDave Hansen 49c221c0b0SDave Hansen Say N if unsure. 50c221c0b0SDave Hansen 51730926c3SDan Williamsconfig DEV_DAX_PMEM_COMPAT 52730926c3SDan Williams tristate "PMEM DAX: support the deprecated /sys/class/dax interface" 5367476656SAneesh Kumar K.V depends on m && DEV_DAX_PMEM=m 54730926c3SDan Williams default DEV_DAX_PMEM 55730926c3SDan Williams help 56730926c3SDan Williams Older versions of the libdaxctl library expect to find all 57730926c3SDan Williams device-dax instances under /sys/class/dax. If libdaxctl in 58730926c3SDan Williams your distribution is older than v58 say M, otherwise say N. 59ab68f262SDan Williams 60ab68f262SDan Williamsendif 61