From 3d88002e4a7bd40f355550284c6cd140e6fe29dc Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sun, 31 May 2015 15:02:11 -0400 Subject: libnvdimm: support for legacy (non-aliasing) nvdimms The libnvdimm region driver is an intermediary driver that translates non-volatile "region"s into "namespace" sub-devices that are surfaced by persistent memory block-device drivers (PMEM and BLK). ACPI 6 introduces the concept that a given nvdimm may simultaneously offer multiple access modes to its media through direct PMEM load/store access, or windowed BLK mode. Existing nvdimms mostly implement a PMEM interface, some offer a BLK-like mode, but never both as ACPI 6 defines. If an nvdimm is single interfaced, then there is no need for dimm metadata labels. For these devices we can take the region boundaries directly to create a child namespace device (nd_namespace_io). Acked-by: Christoph Hellwig Tested-by: Toshi Kani Signed-off-by: Dan Williams --- include/uapi/linux/ndctl.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/uapi/linux/ndctl.h') diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h index 37640916d146..174b6371dcc1 100644 --- a/include/uapi/linux/ndctl.h +++ b/include/uapi/linux/ndctl.h @@ -177,8 +177,18 @@ static inline const char *nvdimm_cmd_name(unsigned cmd) #define ND_DEVICE_DIMM 1 /* nd_dimm: container for "config data" */ +#define ND_DEVICE_REGION_PMEM 2 /* nd_region: (parent of PMEM namespaces) */ +#define ND_DEVICE_REGION_BLK 3 /* nd_region: (parent of BLK namespaces) */ +#define ND_DEVICE_NAMESPACE_IO 4 /* legacy persistent memory */ +#define ND_DEVICE_NAMESPACE_PMEM 5 /* PMEM namespace (may alias with BLK) */ +#define ND_DEVICE_NAMESPACE_BLK 6 /* BLK namespace (may alias with PMEM) */ enum nd_driver_flags { ND_DRIVER_DIMM = 1 << ND_DEVICE_DIMM, + ND_DRIVER_REGION_PMEM = 1 << ND_DEVICE_REGION_PMEM, + ND_DRIVER_REGION_BLK = 1 << ND_DEVICE_REGION_BLK, + ND_DRIVER_NAMESPACE_IO = 1 << ND_DEVICE_NAMESPACE_IO, + ND_DRIVER_NAMESPACE_PMEM = 1 << ND_DEVICE_NAMESPACE_PMEM, + ND_DRIVER_NAMESPACE_BLK = 1 << ND_DEVICE_NAMESPACE_BLK, }; #endif /* __NDCTL_H__ */ -- cgit v1.2.3-59-g8ed1b