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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-18 11:42:49 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-18 11:42:49 -0400 |
| commit | 34a984f7b0cc6355a1e0c184251d0d4cc86f44d2 (patch) | |
| tree | 5ed28ee6cf191216be394c78234b13edbe69d1f8 /arch/x86/Kconfig | |
| parent | 90d1c087861dcc3d1175993fc03492c137fd21bb (diff) | |
| parent | 4c1eaa2344fb26bb5e936fb4d8ee307343ea0089 (diff) | |
| download | linux-34a984f7b0cc6355a1e0c184251d0d4cc86f44d2.tar.bz2 | |
Merge branch 'x86-pmem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull PMEM driver from Ingo Molnar:
"This is the initial support for the pmem block device driver:
persistent non-volatile memory space mapped into the system's physical
memory space as large physical memory regions.
The driver is based on Intel code, written by Ross Zwisler, with fixes
by Boaz Harrosh, integrated with x86 e820 memory resource management
and tidied up by Christoph Hellwig.
Note that there were two other separate pmem driver submissions to
lkml: but apparently all parties (Ross Zwisler, Boaz Harrosh) are
reasonably happy with this initial version.
This version enables minimal support that enables persistent memory
devices out in the wild to work as block devices, identified through a
magic (non-standard) e820 flag and auto-discovered if
CONFIG_X86_PMEM_LEGACY=y, or added explicitly through manipulating the
memory maps via the "memmap=..." boot option with the new, special '!'
modifier character.
Limitations: this is a regular block device, and since the pmem areas
are not struct page backed, they are invisible to the rest of the
system (other than the block IO device), so direct IO to/from pmem
areas, direct mmap() or XIP is not possible yet. The page cache will
also shadow and double buffer pmem contents, etc.
Initial support is for x86"
* 'x86-pmem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
drivers/block/pmem: Fix 32-bit build warning in pmem_alloc()
drivers/block/pmem: Add a driver for persistent memory
x86/mm: Add support for the non-standard protected e820 type
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 937812b8e0b9..6049d587599e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1421,6 +1421,16 @@ config ILLEGAL_POINTER_VALUE source "mm/Kconfig" +config X86_PMEM_LEGACY + bool "Support non-standard NVDIMMs and ADR protected memory" + help + Treat memory marked using the non-standard e820 type of 12 as used + by the Intel Sandy Bridge-EP reference BIOS as protected memory. + The kernel will offer these regions to the 'pmem' driver so + they can be used for persistent storage. + + Say Y if unsure. + config HIGHPTE bool "Allocate 3rd-level pagetables from highmem" depends on HIGHMEM |