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authorRoss Zwisler <ross.zwisler@linux.intel.com>2015-06-25 03:08:39 -0400
committerDan Williams <dan.j.williams@intel.com>2015-06-26 11:23:38 -0400
commit61031952f4c89dba1065f7a5b9419badb112554c (patch)
tree70a8b29fa96b6222bd19bb604d364bce404f14ae /lib
parent74ae66c3b14ffa94c8d2dea201cdf8e6203d13d5 (diff)
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arch, x86: pmem api for ensuring durability of persistent memory updates
Based on an original patch by Ross Zwisler [1]. Writes to persistent memory have the potential to be posted to cpu cache, cpu write buffers, and platform write buffers (memory controller) before being committed to persistent media. Provide apis, memcpy_to_pmem(), wmb_pmem(), and memremap_pmem(), to write data to pmem and assert that it is durable in PMEM (a persistent linear address range). A '__pmem' attribute is added so sparse can track proper usage of pointers to pmem. This continues the status quo of pmem being x86 only for 4.2, but reworks to ioremap, and wider implementation of memremap() will enable other archs in 4.3. [1]: https://lists.01.org/pipermail/linux-nvdimm/2015-May/000932.html Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> [djbw: various reworks] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 601965a948e8..d27c13a91c28 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -522,4 +522,7 @@ source "lib/fonts/Kconfig"
config ARCH_HAS_SG_CHAIN
def_bool n
+config ARCH_HAS_PMEM_API
+ bool
+
endmenu