Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 462 insertions, 0 deletions

diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
new file mode 100644
index 000000000..08bbbac9a
--- /dev/null
+++ b/drivers/cxl/pmem.c
@@ -0,0 +1,462 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2021 Intel Corporation. All rights reserved. */
+#include <linux/libnvdimm.h>
+#include <asm/unaligned.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/ndctl.h>
+#include <linux/async.h>
+#include <linux/slab.h>
+#include <linux/nd.h>
+#include "cxlmem.h"
+#include "cxl.h"
+
+extern const struct nvdimm_security_ops *cxl_security_ops;
+
+static __read_mostly DECLARE_BITMAP(exclusive_cmds, CXL_MEM_COMMAND_ID_MAX);
+
+static void clear_exclusive(void *cxlds)
+{
+	clear_exclusive_cxl_commands(cxlds, exclusive_cmds);
+}
+
+static void unregister_nvdimm(void *nvdimm)
+{
+	nvdimm_delete(nvdimm);
+}
+
+static ssize_t provider_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+	struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm);
+
+	return sysfs_emit(buf, "%s\n", dev_name(&cxl_nvd->dev));
+}
+static DEVICE_ATTR_RO(provider);
+
+static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+	struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm);
+	struct cxl_dev_state *cxlds = cxl_nvd->cxlmd->cxlds;
+
+	return sysfs_emit(buf, "%lld\n", cxlds->serial);
+}
+static DEVICE_ATTR_RO(id);
+
+static struct attribute *cxl_dimm_attributes[] = {
+	&dev_attr_id.attr,
+	&dev_attr_provider.attr,
+	NULL
+};
+
+static const struct attribute_group cxl_dimm_attribute_group = {
+	.name = "cxl",
+	.attrs = cxl_dimm_attributes,
+};
+
+static const struct attribute_group *cxl_dimm_attribute_groups[] = {
+	&cxl_dimm_attribute_group,
+	NULL
+};
+
+static int cxl_nvdimm_probe(struct device *dev)
+{
+	struct cxl_nvdimm *cxl_nvd = to_cxl_nvdimm(dev);
+	struct cxl_memdev *cxlmd = cxl_nvd->cxlmd;
+	struct cxl_nvdimm_bridge *cxl_nvb = cxlmd->cxl_nvb;
+	unsigned long flags = 0, cmd_mask = 0;
+	struct cxl_dev_state *cxlds = cxlmd->cxlds;
+	struct nvdimm *nvdimm;
+	int rc;
+
+	set_exclusive_cxl_commands(cxlds, exclusive_cmds);
+	rc = devm_add_action_or_reset(dev, clear_exclusive, cxlds);
+	if (rc)
+		return rc;
+
+	set_bit(NDD_LABELING, &flags);
+	set_bit(ND_CMD_GET_CONFIG_SIZE, &cmd_mask);
+	set_bit(ND_CMD_GET_CONFIG_DATA, &cmd_mask);
+	set_bit(ND_CMD_SET_CONFIG_DATA, &cmd_mask);
+	nvdimm = __nvdimm_create(cxl_nvb->nvdimm_bus, cxl_nvd,
+				 cxl_dimm_attribute_groups, flags,
+				 cmd_mask, 0, NULL, cxl_nvd->dev_id,
+				 cxl_security_ops, NULL);
+	if (!nvdimm)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, nvdimm);
+	return devm_add_action_or_reset(dev, unregister_nvdimm, nvdimm);
+}
+
+static struct cxl_driver cxl_nvdimm_driver = {
+	.name = "cxl_nvdimm",
+	.probe = cxl_nvdimm_probe,
+	.id = CXL_DEVICE_NVDIMM,
+	.drv = {
+		.suppress_bind_attrs = true,
+	},
+};
+
+static int cxl_pmem_get_config_size(struct cxl_dev_state *cxlds,
+				    struct nd_cmd_get_config_size *cmd,
+				    unsigned int buf_len)
+{
+	if (sizeof(*cmd) > buf_len)
+		return -EINVAL;
+
+	*cmd = (struct nd_cmd_get_config_size) {
+		 .config_size = cxlds->lsa_size,
+		 .max_xfer = cxlds->payload_size - sizeof(struct cxl_mbox_set_lsa),
+	};
+
+	return 0;
+}
+
+static int cxl_pmem_get_config_data(struct cxl_dev_state *cxlds,
+				    struct nd_cmd_get_config_data_hdr *cmd,
+				    unsigned int buf_len)
+{
+	struct cxl_mbox_get_lsa get_lsa;
+	struct cxl_mbox_cmd mbox_cmd;
+	int rc;
+
+	if (sizeof(*cmd) > buf_len)
+		return -EINVAL;
+	if (struct_size(cmd, out_buf, cmd->in_length) > buf_len)
+		return -EINVAL;
+
+	get_lsa = (struct cxl_mbox_get_lsa) {
+		.offset = cpu_to_le32(cmd->in_offset),
+		.length = cpu_to_le32(cmd->in_length),
+	};
+	mbox_cmd = (struct cxl_mbox_cmd) {
+		.opcode = CXL_MBOX_OP_GET_LSA,
+		.payload_in = &get_lsa,
+		.size_in = sizeof(get_lsa),
+		.size_out = cmd->in_length,
+		.payload_out = cmd->out_buf,
+	};
+
+	rc = cxl_internal_send_cmd(cxlds, &mbox_cmd);
+	cmd->status = 0;
+
+	return rc;
+}
+
+static int cxl_pmem_set_config_data(struct cxl_dev_state *cxlds,
+				    struct nd_cmd_set_config_hdr *cmd,
+				    unsigned int buf_len)
+{
+	struct cxl_mbox_set_lsa *set_lsa;
+	struct cxl_mbox_cmd mbox_cmd;
+	int rc;
+
+	if (sizeof(*cmd) > buf_len)
+		return -EINVAL;
+
+	/* 4-byte status follows the input data in the payload */
+	if (size_add(struct_size(cmd, in_buf, cmd->in_length), 4) > buf_len)
+		return -EINVAL;
+
+	set_lsa =
+		kvzalloc(struct_size(set_lsa, data, cmd->in_length), GFP_KERNEL);
+	if (!set_lsa)
+		return -ENOMEM;
+
+	*set_lsa = (struct cxl_mbox_set_lsa) {
+		.offset = cpu_to_le32(cmd->in_offset),
+	};
+	memcpy(set_lsa->data, cmd->in_buf, cmd->in_length);
+	mbox_cmd = (struct cxl_mbox_cmd) {
+		.opcode = CXL_MBOX_OP_SET_LSA,
+		.payload_in = set_lsa,
+		.size_in = struct_size(set_lsa, data, cmd->in_length),
+	};
+
+	rc = cxl_internal_send_cmd(cxlds, &mbox_cmd);
+
+	/*
+	 * Set "firmware" status (4-packed bytes at the end of the input
+	 * payload.
+	 */
+	put_unaligned(0, (u32 *) &cmd->in_buf[cmd->in_length]);
+	kvfree(set_lsa);
+
+	return rc;
+}
+
+static int cxl_pmem_nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd,
+			       void *buf, unsigned int buf_len)
+{
+	struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm);
+	unsigned long cmd_mask = nvdimm_cmd_mask(nvdimm);
+	struct cxl_memdev *cxlmd = cxl_nvd->cxlmd;
+	struct cxl_dev_state *cxlds = cxlmd->cxlds;
+
+	if (!test_bit(cmd, &cmd_mask))
+		return -ENOTTY;
+
+	switch (cmd) {
+	case ND_CMD_GET_CONFIG_SIZE:
+		return cxl_pmem_get_config_size(cxlds, buf, buf_len);
+	case ND_CMD_GET_CONFIG_DATA:
+		return cxl_pmem_get_config_data(cxlds, buf, buf_len);
+	case ND_CMD_SET_CONFIG_DATA:
+		return cxl_pmem_set_config_data(cxlds, buf, buf_len);
+	default:
+		return -ENOTTY;
+	}
+}
+
+static int cxl_pmem_ctl(struct nvdimm_bus_descriptor *nd_desc,
+			struct nvdimm *nvdimm, unsigned int cmd, void *buf,
+			unsigned int buf_len, int *cmd_rc)
+{
+	/*
+	 * No firmware response to translate, let the transport error
+	 * code take precedence.
+	 */
+	*cmd_rc = 0;
+
+	if (!nvdimm)
+		return -ENOTTY;
+	return cxl_pmem_nvdimm_ctl(nvdimm, cmd, buf, buf_len);
+}
+
+static int detach_nvdimm(struct device *dev, void *data)
+{
+	struct cxl_nvdimm *cxl_nvd;
+	bool release = false;
+
+	if (!is_cxl_nvdimm(dev))
+		return 0;
+
+	device_lock(dev);
+	if (!dev->driver)
+		goto out;
+
+	cxl_nvd = to_cxl_nvdimm(dev);
+	if (cxl_nvd->cxlmd && cxl_nvd->cxlmd->cxl_nvb == data)
+		release = true;
+out:
+	device_unlock(dev);
+	if (release)
+		device_release_driver(dev);
+	return 0;
+}
+
+static void unregister_nvdimm_bus(void *_cxl_nvb)
+{
+	struct cxl_nvdimm_bridge *cxl_nvb = _cxl_nvb;
+	struct nvdimm_bus *nvdimm_bus = cxl_nvb->nvdimm_bus;
+
+	bus_for_each_dev(&cxl_bus_type, NULL, cxl_nvb, detach_nvdimm);
+
+	cxl_nvb->nvdimm_bus = NULL;
+	nvdimm_bus_unregister(nvdimm_bus);
+}
+
+static int cxl_nvdimm_bridge_probe(struct device *dev)
+{
+	struct cxl_nvdimm_bridge *cxl_nvb = to_cxl_nvdimm_bridge(dev);
+
+	cxl_nvb->nd_desc = (struct nvdimm_bus_descriptor) {
+		.provider_name = "CXL",
+		.module = THIS_MODULE,
+		.ndctl = cxl_pmem_ctl,
+	};
+
+	cxl_nvb->nvdimm_bus =
+		nvdimm_bus_register(&cxl_nvb->dev, &cxl_nvb->nd_desc);
+
+	if (!cxl_nvb->nvdimm_bus)
+		return -ENOMEM;
+
+	return devm_add_action_or_reset(dev, unregister_nvdimm_bus, cxl_nvb);
+}
+
+static struct cxl_driver cxl_nvdimm_bridge_driver = {
+	.name = "cxl_nvdimm_bridge",
+	.probe = cxl_nvdimm_bridge_probe,
+	.id = CXL_DEVICE_NVDIMM_BRIDGE,
+	.drv = {
+		.suppress_bind_attrs = true,
+	},
+};
+
+static void unregister_nvdimm_region(void *nd_region)
+{
+	nvdimm_region_delete(nd_region);
+}
+
+static void cxlr_pmem_remove_resource(void *res)
+{
+	remove_resource(res);
+}
+
+struct cxl_pmem_region_info {
+	u64 offset;
+	u64 serial;
+};
+
+static int cxl_pmem_region_probe(struct device *dev)
+{
+	struct nd_mapping_desc mappings[CXL_DECODER_MAX_INTERLEAVE];
+	struct cxl_pmem_region *cxlr_pmem = to_cxl_pmem_region(dev);
+	struct cxl_region *cxlr = cxlr_pmem->cxlr;
+	struct cxl_nvdimm_bridge *cxl_nvb = cxlr->cxl_nvb;
+	struct cxl_pmem_region_info *info = NULL;
+	struct nd_interleave_set *nd_set;
+	struct nd_region_desc ndr_desc;
+	struct cxl_nvdimm *cxl_nvd;
+	struct nvdimm *nvdimm;
+	struct resource *res;
+	int rc, i = 0;
+
+	memset(&mappings, 0, sizeof(mappings));
+	memset(&ndr_desc, 0, sizeof(ndr_desc));
+
+	res = devm_kzalloc(dev, sizeof(*res), GFP_KERNEL);
+	if (!res)
+		return -ENOMEM;
+
+	res->name = "Persistent Memory";
+	res->start = cxlr_pmem->hpa_range.start;
+	res->end = cxlr_pmem->hpa_range.end;
+	res->flags = IORESOURCE_MEM;
+	res->desc = IORES_DESC_PERSISTENT_MEMORY;
+
+	rc = insert_resource(&iomem_resource, res);
+	if (rc)
+		return rc;
+
+	rc = devm_add_action_or_reset(dev, cxlr_pmem_remove_resource, res);
+	if (rc)
+		return rc;
+
+	ndr_desc.res = res;
+	ndr_desc.provider_data = cxlr_pmem;
+
+	ndr_desc.numa_node = memory_add_physaddr_to_nid(res->start);
+	ndr_desc.target_node = phys_to_target_node(res->start);
+	if (ndr_desc.target_node == NUMA_NO_NODE) {
+		ndr_desc.target_node = ndr_desc.numa_node;
+		dev_dbg(&cxlr->dev, "changing target node from %d to %d",
+			NUMA_NO_NODE, ndr_desc.target_node);
+	}
+
+	nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
+	if (!nd_set)
+		return -ENOMEM;
+
+	ndr_desc.memregion = cxlr->id;
+	set_bit(ND_REGION_CXL, &ndr_desc.flags);
+	set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags);
+
+	info = kmalloc_array(cxlr_pmem->nr_mappings, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	for (i = 0; i < cxlr_pmem->nr_mappings; i++) {
+		struct cxl_pmem_region_mapping *m = &cxlr_pmem->mapping[i];
+		struct cxl_memdev *cxlmd = m->cxlmd;
+		struct cxl_dev_state *cxlds = cxlmd->cxlds;
+
+		cxl_nvd = cxlmd->cxl_nvd;
+		nvdimm = dev_get_drvdata(&cxl_nvd->dev);
+		if (!nvdimm) {
+			dev_dbg(dev, "[%d]: %s: no nvdimm found\n", i,
+				dev_name(&cxlmd->dev));
+			rc = -ENODEV;
+			goto out_nvd;
+		}
+
+		m->cxl_nvd = cxl_nvd;
+		mappings[i] = (struct nd_mapping_desc) {
+			.nvdimm = nvdimm,
+			.start = m->start,
+			.size = m->size,
+			.position = i,
+		};
+		info[i].offset = m->start;
+		info[i].serial = cxlds->serial;
+	}
+	ndr_desc.num_mappings = cxlr_pmem->nr_mappings;
+	ndr_desc.mapping = mappings;
+
+	/*
+	 * TODO enable CXL labels which skip the need for 'interleave-set cookie'
+	 */
+	nd_set->cookie1 =
+		nd_fletcher64(info, sizeof(*info) * cxlr_pmem->nr_mappings, 0);
+	nd_set->cookie2 = nd_set->cookie1;
+	ndr_desc.nd_set = nd_set;
+
+	cxlr_pmem->nd_region =
+		nvdimm_pmem_region_create(cxl_nvb->nvdimm_bus, &ndr_desc);
+	if (!cxlr_pmem->nd_region) {
+		rc = -ENOMEM;
+		goto out_nvd;
+	}
+
+	rc = devm_add_action_or_reset(dev, unregister_nvdimm_region,
+				      cxlr_pmem->nd_region);
+out_nvd:
+	kfree(info);
+
+	return rc;
+}
+
+static struct cxl_driver cxl_pmem_region_driver = {
+	.name = "cxl_pmem_region",
+	.probe = cxl_pmem_region_probe,
+	.id = CXL_DEVICE_PMEM_REGION,
+	.drv = {
+		.suppress_bind_attrs = true,
+	},
+};
+
+static __init int cxl_pmem_init(void)
+{
+	int rc;
+
+	set_bit(CXL_MEM_COMMAND_ID_SET_SHUTDOWN_STATE, exclusive_cmds);
+	set_bit(CXL_MEM_COMMAND_ID_SET_LSA, exclusive_cmds);
+
+	rc = cxl_driver_register(&cxl_nvdimm_bridge_driver);
+	if (rc)
+		return rc;
+
+	rc = cxl_driver_register(&cxl_nvdimm_driver);
+	if (rc)
+		goto err_nvdimm;
+
+	rc = cxl_driver_register(&cxl_pmem_region_driver);
+	if (rc)
+		goto err_region;
+
+	return 0;
+
+err_region:
+	cxl_driver_unregister(&cxl_nvdimm_driver);
+err_nvdimm:
+	cxl_driver_unregister(&cxl_nvdimm_bridge_driver);
+	return rc;
+}
+
+static __exit void cxl_pmem_exit(void)
+{
+	cxl_driver_unregister(&cxl_pmem_region_driver);
+	cxl_driver_unregister(&cxl_nvdimm_driver);
+	cxl_driver_unregister(&cxl_nvdimm_bridge_driver);
+}
+
+MODULE_LICENSE("GPL v2");
+module_init(cxl_pmem_init);
+module_exit(cxl_pmem_exit);
+MODULE_IMPORT_NS(CXL);
+MODULE_ALIAS_CXL(CXL_DEVICE_NVDIMM_BRIDGE);
+MODULE_ALIAS_CXL(CXL_DEVICE_NVDIMM);
+MODULE_ALIAS_CXL(CXL_DEVICE_PMEM_REGION);