Merge tag 'libnvdimm-for-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm

Pull libnvdimm subsystem from Dan Williams:
 "The libnvdimm sub-system introduces, in addition to the
  libnvdimm-core, 4 drivers / enabling modules:

  NFIT:
    Instantiates an "nvdimm bus" with the core and registers memory
    devices (NVDIMMs) enumerated by the ACPI 6.0 NFIT (NVDIMM Firmware
    Interface table).

    After registering NVDIMMs the NFIT driver then registers "region"
    devices.  A libnvdimm-region defines an access mode and the
    boundaries of persistent memory media.  A region may span multiple
    NVDIMMs that are interleaved by the hardware memory controller.  In
    turn, a libnvdimm-region can be carved into a "namespace" device and
    bound to the PMEM or BLK driver which will attach a Linux block
    device (disk) interface to the memory.

  PMEM:
    Initially merged in v4.1 this driver for contiguous spans of
    persistent memory address ranges is re-worked to drive
    PMEM-namespaces emitted by the libnvdimm-core.

    In this update the PMEM driver, on x86, gains the ability to assert
    that writes to persistent memory have been flushed all the way
    through the caches and buffers in the platform to persistent media.
    See memcpy_to_pmem() and wmb_pmem().

  BLK:
    This new driver enables access to persistent memory media through
    "Block Data Windows" as defined by the NFIT.  The primary difference
    of this driver to PMEM is that only a small window of persistent
    memory is mapped into system address space at any given point in
    time.

    Per-NVDIMM windows are reprogrammed at run time, per-I/O, to access
    different portions of the media.  BLK-mode, by definition, does not
    support DAX.

  BTT:
    This is a library, optionally consumed by either PMEM or BLK, that
    converts a byte-accessible namespace into a disk with atomic sector
    update semantics (prevents sector tearing on crash or power loss).

    The sinister aspect of sector tearing is that most applications do
    not know they have a atomic sector dependency.  At least today's
    disk's rarely ever tear sectors and if they do one almost certainly
    gets a CRC error on access.  NVDIMMs will always tear and always
    silently.  Until an application is audited to be robust in the
    presence of sector-tearing the usage of BTT is recommended.

  Thanks to: Ross Zwisler, Jeff Moyer, Vishal Verma, Christoph Hellwig,
  Ingo Molnar, Neil Brown, Boaz Harrosh, Robert Elliott, Matthew Wilcox,
  Andy Rudoff, Linda Knippers, Toshi Kani, Nicholas Moulin, Rafael
  Wysocki, and Bob Moore"

* tag 'libnvdimm-for-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm: (33 commits)
  arch, x86: pmem api for ensuring durability of persistent memory updates
  libnvdimm: Add sysfs numa_node to NVDIMM devices
  libnvdimm: Set numa_node to NVDIMM devices
  acpi: Add acpi_map_pxm_to_online_node()
  libnvdimm, nfit: handle unarmed dimms, mark namespaces read-only
  pmem: flag pmem block devices as non-rotational
  libnvdimm: enable iostat
  pmem: make_request cleanups
  libnvdimm, pmem: fix up max_hw_sectors
  libnvdimm, blk: add support for blk integrity
  libnvdimm, btt: add support for blk integrity
  fs/block_dev.c: skip rw_page if bdev has integrity
  libnvdimm: Non-Volatile Devices
  tools/testing/nvdimm: libnvdimm unit test infrastructure
  libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory
  nd_btt: atomic sector updates
  libnvdimm: infrastructure for btt devices
  libnvdimm: write blk label set
  libnvdimm: write pmem label set
  libnvdimm: blk labels and namespace instantiation
  ...

2 files changed, 198 insertions, 0 deletions

diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index c1c23f19d4a2..1ff9942718fe 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -272,6 +272,7 @@ header-y += ncp_fs.h
 header-y += ncp.h
 header-y += ncp_mount.h
 header-y += ncp_no.h
+header-y += ndctl.h
 header-y += neighbour.h
 header-y += netconf.h
 header-y += netdevice.h
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
new file mode 100644
index 000000000000..2b94ea2287bb
--- /dev/null
+++ b/include/uapi/linux/ndctl.h
@@ -0,0 +1,197 @@
+/*
+ * Copyright (c) 2014-2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU Lesser General Public License,
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
+ * more details.
+ */
+#ifndef __NDCTL_H__
+#define __NDCTL_H__
+
+#include <linux/types.h>
+
+struct nd_cmd_smart {
+	__u32 status;
+	__u8 data[128];
+} __packed;
+
+struct nd_cmd_smart_threshold {
+	__u32 status;
+	__u8 data[8];
+} __packed;
+
+struct nd_cmd_dimm_flags {
+	__u32 status;
+	__u32 flags;
+} __packed;
+
+struct nd_cmd_get_config_size {
+	__u32 status;
+	__u32 config_size;
+	__u32 max_xfer;
+} __packed;
+
+struct nd_cmd_get_config_data_hdr {
+	__u32 in_offset;
+	__u32 in_length;
+	__u32 status;
+	__u8 out_buf[0];
+} __packed;
+
+struct nd_cmd_set_config_hdr {
+	__u32 in_offset;
+	__u32 in_length;
+	__u8 in_buf[0];
+} __packed;
+
+struct nd_cmd_vendor_hdr {
+	__u32 opcode;
+	__u32 in_length;
+	__u8 in_buf[0];
+} __packed;
+
+struct nd_cmd_vendor_tail {
+	__u32 status;
+	__u32 out_length;
+	__u8 out_buf[0];
+} __packed;
+
+struct nd_cmd_ars_cap {
+	__u64 address;
+	__u64 length;
+	__u32 status;
+	__u32 max_ars_out;
+} __packed;
+
+struct nd_cmd_ars_start {
+	__u64 address;
+	__u64 length;
+	__u16 type;
+	__u8 reserved[6];
+	__u32 status;
+} __packed;
+
+struct nd_cmd_ars_status {
+	__u32 status;
+	__u32 out_length;
+	__u64 address;
+	__u64 length;
+	__u16 type;
+	__u32 num_records;
+	struct nd_ars_record {
+		__u32 handle;
+		__u32 flags;
+		__u64 err_address;
+		__u64 mask;
+	} __packed records[0];
+} __packed;
+
+enum {
+	ND_CMD_IMPLEMENTED = 0,
+
+	/* bus commands */
+	ND_CMD_ARS_CAP = 1,
+	ND_CMD_ARS_START = 2,
+	ND_CMD_ARS_STATUS = 3,
+
+	/* per-dimm commands */
+	ND_CMD_SMART = 1,
+	ND_CMD_SMART_THRESHOLD = 2,
+	ND_CMD_DIMM_FLAGS = 3,
+	ND_CMD_GET_CONFIG_SIZE = 4,
+	ND_CMD_GET_CONFIG_DATA = 5,
+	ND_CMD_SET_CONFIG_DATA = 6,
+	ND_CMD_VENDOR_EFFECT_LOG_SIZE = 7,
+	ND_CMD_VENDOR_EFFECT_LOG = 8,
+	ND_CMD_VENDOR = 9,
+};
+
+static inline const char *nvdimm_bus_cmd_name(unsigned cmd)
+{
+	static const char * const names[] = {
+		[ND_CMD_ARS_CAP] = "ars_cap",
+		[ND_CMD_ARS_START] = "ars_start",
+		[ND_CMD_ARS_STATUS] = "ars_status",
+	};
+
+	if (cmd < ARRAY_SIZE(names) && names[cmd])
+		return names[cmd];
+	return "unknown";
+}
+
+static inline const char *nvdimm_cmd_name(unsigned cmd)
+{
+	static const char * const names[] = {
+		[ND_CMD_SMART] = "smart",
+		[ND_CMD_SMART_THRESHOLD] = "smart_thresh",
+		[ND_CMD_DIMM_FLAGS] = "flags",
+		[ND_CMD_GET_CONFIG_SIZE] = "get_size",
+		[ND_CMD_GET_CONFIG_DATA] = "get_data",
+		[ND_CMD_SET_CONFIG_DATA] = "set_data",
+		[ND_CMD_VENDOR_EFFECT_LOG_SIZE] = "effect_size",
+		[ND_CMD_VENDOR_EFFECT_LOG] = "effect_log",
+		[ND_CMD_VENDOR] = "vendor",
+	};
+
+	if (cmd < ARRAY_SIZE(names) && names[cmd])
+		return names[cmd];
+	return "unknown";
+}
+
+#define ND_IOCTL 'N'
+
+#define ND_IOCTL_SMART			_IOWR(ND_IOCTL, ND_CMD_SMART,\
+					struct nd_cmd_smart)
+
+#define ND_IOCTL_SMART_THRESHOLD	_IOWR(ND_IOCTL, ND_CMD_SMART_THRESHOLD,\
+					struct nd_cmd_smart_threshold)
+
+#define ND_IOCTL_DIMM_FLAGS		_IOWR(ND_IOCTL, ND_CMD_DIMM_FLAGS,\
+					struct nd_cmd_dimm_flags)
+
+#define ND_IOCTL_GET_CONFIG_SIZE	_IOWR(ND_IOCTL, ND_CMD_GET_CONFIG_SIZE,\
+					struct nd_cmd_get_config_size)
+
+#define ND_IOCTL_GET_CONFIG_DATA	_IOWR(ND_IOCTL, ND_CMD_GET_CONFIG_DATA,\
+					struct nd_cmd_get_config_data_hdr)
+
+#define ND_IOCTL_SET_CONFIG_DATA	_IOWR(ND_IOCTL, ND_CMD_SET_CONFIG_DATA,\
+					struct nd_cmd_set_config_hdr)
+
+#define ND_IOCTL_VENDOR			_IOWR(ND_IOCTL, ND_CMD_VENDOR,\
+					struct nd_cmd_vendor_hdr)
+
+#define ND_IOCTL_ARS_CAP		_IOWR(ND_IOCTL, ND_CMD_ARS_CAP,\
+					struct nd_cmd_ars_cap)
+
+#define ND_IOCTL_ARS_START		_IOWR(ND_IOCTL, ND_CMD_ARS_START,\
+					struct nd_cmd_ars_start)
+
+#define ND_IOCTL_ARS_STATUS		_IOWR(ND_IOCTL, ND_CMD_ARS_STATUS,\
+					struct nd_cmd_ars_status)
+
+#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,
+};
+
+enum {
+	ND_MIN_NAMESPACE_SIZE = 0x00400000,
+};
+#endif /* __NDCTL_H__ */