diff options
Diffstat (limited to 'drivers/dax/Kconfig')
| -rw-r--r-- | drivers/dax/Kconfig | 45 |
1 files changed, 27 insertions, 18 deletions
diff --git a/drivers/dax/Kconfig b/drivers/dax/Kconfig index f33c73e4af41..5fdf269a822e 100644 --- a/drivers/dax/Kconfig +++ b/drivers/dax/Kconfig @@ -1,8 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only -config DAX_DRIVER - select DAX - bool - menuconfig DAX tristate "DAX: direct access to differentiated memory" select SRCU @@ -32,29 +28,42 @@ config DEV_DAX_PMEM Say M if unsure +config DEV_DAX_HMEM + tristate "HMEM DAX: direct access to 'specific purpose' memory" + depends on EFI_SOFT_RESERVE + select NUMA_KEEP_MEMINFO if (NUMA && X86) + default DEV_DAX + help + EFI 2.8 platforms, and others, may advertise 'specific purpose' + memory. For example, a high bandwidth memory pool. The + indication from platform firmware is meant to reserve the + memory from typical usage by default. This driver creates + device-dax instances for these memory ranges, and that also + enables the possibility to assign them to the DEV_DAX_KMEM + driver to override the reservation and add them to kernel + "System RAM" pool. + + Say M if unsure. + +config DEV_DAX_HMEM_DEVICES + depends on DEV_DAX_HMEM && DAX=y + def_bool y + 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. + Support access to persistent, or other performance + differentiated memory as if it were System RAM. This allows + easier use of persistent memory by unmodified applications, or + adds core kernel memory services to heterogeneous memory types + (HMEM) marked "reserved" by platform firmware. 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. + device_dax driver 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 |