CONFIG_DEV_DAX_HMEM: HMEM DAX: direct access to 'specific purpose' memory

General informations

The Linux kernel configuration item CONFIG_DEV_DAX_HMEM:

• prompt: HMEM DAX: direct access to 'specific purpose' memory
• type: tristate
• depends on: CONFIG_EFI_SOFT_RESERVE
• defined in drivers/dax/Kconfig
• found in Linux kernels: 5.5–5.19, 6.0–6.12
• modules built: dax_hmem

Help text

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.

Hardware

LKDDb

Raw data from LKDDb:

• lkddb module dax_hmem CONFIG_DEV_DAX_HMEM : drivers/dax/Kconfig : "HMEM DAX: direct access to 'specific purpose' memory" # in 5.5–5.19, 6.0–6.12
• lkddb platform "hmem" : CONFIG_DAX CONFIG_DEV_DAX_HMEM : drivers/dax/hmem.c # in 5.5–5.9
• lkddb platform "hmem" : CONFIG_DAX CONFIG_DEV_DAX_HMEM : drivers/dax/hmem/hmem.c # in 5.10–5.19, 6.0–6.2, 6.2+HEAD
• lkddb platform "hmem" : CONFIG_DEV_DAX_HMEM : drivers/dax/hmem/hmem.c # in 6.3–6.12
• lkddb platform "hmem_platform" : CONFIG_DEV_DAX_HMEM : drivers/dax/hmem/hmem.c # in 6.3–6.12

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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