12080e88aSDan Williamsconfig DAX_DRIVER 22080e88aSDan Williams select DAX 32080e88aSDan Williams bool 42080e88aSDan Williams 57b6be844SDan Williamsmenuconfig DAX 6ab68f262SDan Williams tristate "DAX: direct access to differentiated memory" 7956a4cd2SDan Williams select SRCU 87b6be844SDan Williams default m if NVDIMM_DAX 97b6be844SDan Williams 107b6be844SDan Williamsif DAX 117b6be844SDan Williams 127b6be844SDan Williamsconfig DEV_DAX 137b6be844SDan Williams tristate "Device DAX: direct access mapping device" 147b6be844SDan Williams depends on TRANSPARENT_HUGEPAGE 15ab68f262SDan Williams help 16ab68f262SDan Williams Support raw access to differentiated (persistence, bandwidth, 17ab68f262SDan Williams latency...) memory via an mmap(2) capable character 18ab68f262SDan Williams device. Platform firmware or a device driver may identify a 19ab68f262SDan Williams platform memory resource that is differentiated from the 20ab68f262SDan Williams baseline memory pool. Mappings of a /dev/daxX.Y device impose 21ab68f262SDan Williams restrictions that make the mapping behavior deterministic. 22ab68f262SDan Williams 23ab68f262SDan Williamsconfig DEV_DAX_PMEM 24ab68f262SDan Williams tristate "PMEM DAX: direct access to persistent memory" 2574d71a01SMike Galbraith depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX 26ab68f262SDan Williams default DEV_DAX 27ab68f262SDan Williams help 28ab68f262SDan Williams Support raw access to persistent memory. Note that this 29ab68f262SDan Williams driver consumes memory ranges allocated and exported by the 30ab68f262SDan Williams libnvdimm sub-system. 31ab68f262SDan Williams 32730926c3SDan Williams Say M if unsure 33730926c3SDan Williams 34c221c0b0SDave Hansenconfig DEV_DAX_KMEM 35c221c0b0SDave Hansen tristate "KMEM DAX: volatile-use of persistent memory" 36c221c0b0SDave Hansen default DEV_DAX 37c221c0b0SDave Hansen depends on DEV_DAX 38c221c0b0SDave Hansen depends on MEMORY_HOTPLUG # for add_memory() and friends 39c221c0b0SDave Hansen help 40c221c0b0SDave Hansen Support access to persistent memory as if it were RAM. This 41c221c0b0SDave Hansen allows easier use of persistent memory by unmodified 42c221c0b0SDave Hansen applications. 43c221c0b0SDave Hansen 44c221c0b0SDave Hansen To use this feature, a DAX device must be unbound from the 45c221c0b0SDave Hansen device_dax driver (PMEM DAX) and bound to this kmem driver 46c221c0b0SDave Hansen on each boot. 47c221c0b0SDave Hansen 48c221c0b0SDave Hansen Say N if unsure. 49c221c0b0SDave Hansen 50730926c3SDan Williamsconfig DEV_DAX_PMEM_COMPAT 51730926c3SDan Williams tristate "PMEM DAX: support the deprecated /sys/class/dax interface" 5267476656SAneesh Kumar K.V depends on m && DEV_DAX_PMEM=m 53730926c3SDan Williams default DEV_DAX_PMEM 54730926c3SDan Williams help 55730926c3SDan Williams Older versions of the libdaxctl library expect to find all 56730926c3SDan Williams device-dax instances under /sys/class/dax. If libdaxctl in 57730926c3SDan Williams your distribution is older than v58 say M, otherwise say N. 58ab68f262SDan Williams 59ab68f262SDan Williamsendif 60