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, 885 insertions, 0 deletions

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
new file mode 100644
index 000000000..4c84be378
--- /dev/null
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -0,0 +1,885 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Freescale data path resource container (DPRC) driver
+ *
+ * Copyright (C) 2014-2016 Freescale Semiconductor, Inc.
+ * Copyright 2019-2020 NXP
+ * Author: German Rivera <German.Rivera@freescale.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/fsl/mc.h>
+
+#include "fsl-mc-private.h"
+
+#define FSL_MC_DPRC_DRIVER_NAME    "fsl_mc_dprc"
+
+struct fsl_mc_child_objs {
+	int child_count;
+	struct fsl_mc_obj_desc *child_array;
+};
+
+static bool fsl_mc_device_match(struct fsl_mc_device *mc_dev,
+				struct fsl_mc_obj_desc *obj_desc)
+{
+	return mc_dev->obj_desc.id == obj_desc->id &&
+	       strcmp(mc_dev->obj_desc.type, obj_desc->type) == 0;
+}
+
+static bool fsl_mc_obj_desc_is_allocatable(struct fsl_mc_obj_desc *obj)
+{
+	if (strcmp(obj->type, "dpmcp") == 0 ||
+	    strcmp(obj->type, "dpcon") == 0 ||
+	    strcmp(obj->type, "dpbp") == 0)
+		return true;
+	else
+		return false;
+}
+
+static int __fsl_mc_device_remove_if_not_in_mc(struct device *dev, void *data)
+{
+	int i;
+	struct fsl_mc_child_objs *objs;
+	struct fsl_mc_device *mc_dev;
+
+	mc_dev = to_fsl_mc_device(dev);
+	objs = data;
+
+	for (i = 0; i < objs->child_count; i++) {
+		struct fsl_mc_obj_desc *obj_desc = &objs->child_array[i];
+
+		if (strlen(obj_desc->type) != 0 &&
+		    fsl_mc_device_match(mc_dev, obj_desc))
+			break;
+	}
+
+	if (i == objs->child_count)
+		fsl_mc_device_remove(mc_dev);
+
+	return 0;
+}
+
+static int __fsl_mc_device_remove(struct device *dev, void *data)
+{
+	fsl_mc_device_remove(to_fsl_mc_device(dev));
+	return 0;
+}
+
+/**
+ * dprc_remove_devices - Removes devices for objects removed from a DPRC
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ * @obj_desc_array: array of object descriptors for child objects currently
+ * present in the DPRC in the MC.
+ * @num_child_objects_in_mc: number of entries in obj_desc_array
+ *
+ * Synchronizes the state of the Linux bus driver with the actual state of
+ * the MC by removing devices that represent MC objects that have
+ * been dynamically removed in the physical DPRC.
+ */
+void dprc_remove_devices(struct fsl_mc_device *mc_bus_dev,
+			 struct fsl_mc_obj_desc *obj_desc_array,
+			 int num_child_objects_in_mc)
+{
+	if (num_child_objects_in_mc != 0) {
+		/*
+		 * Remove child objects that are in the DPRC in Linux,
+		 * but not in the MC:
+		 */
+		struct fsl_mc_child_objs objs;
+
+		objs.child_count = num_child_objects_in_mc;
+		objs.child_array = obj_desc_array;
+		device_for_each_child(&mc_bus_dev->dev, &objs,
+				      __fsl_mc_device_remove_if_not_in_mc);
+	} else {
+		/*
+		 * There are no child objects for this DPRC in the MC.
+		 * So, remove all the child devices from Linux:
+		 */
+		device_for_each_child(&mc_bus_dev->dev, NULL,
+				      __fsl_mc_device_remove);
+	}
+}
+EXPORT_SYMBOL_GPL(dprc_remove_devices);
+
+static int __fsl_mc_device_match(struct device *dev, void *data)
+{
+	struct fsl_mc_obj_desc *obj_desc = data;
+	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+
+	return fsl_mc_device_match(mc_dev, obj_desc);
+}
+
+struct fsl_mc_device *fsl_mc_device_lookup(struct fsl_mc_obj_desc *obj_desc,
+					   struct fsl_mc_device *mc_bus_dev)
+{
+	struct device *dev;
+
+	dev = device_find_child(&mc_bus_dev->dev, obj_desc,
+				__fsl_mc_device_match);
+
+	return dev ? to_fsl_mc_device(dev) : NULL;
+}
+
+/**
+ * check_plugged_state_change - Check change in an MC object's plugged state
+ *
+ * @mc_dev: pointer to the fsl-mc device for a given MC object
+ * @obj_desc: pointer to the MC object's descriptor in the MC
+ *
+ * If the plugged state has changed from unplugged to plugged, the fsl-mc
+ * device is bound to the corresponding device driver.
+ * If the plugged state has changed from plugged to unplugged, the fsl-mc
+ * device is unbound from the corresponding device driver.
+ */
+static void check_plugged_state_change(struct fsl_mc_device *mc_dev,
+				       struct fsl_mc_obj_desc *obj_desc)
+{
+	int error;
+	u32 plugged_flag_at_mc =
+			obj_desc->state & FSL_MC_OBJ_STATE_PLUGGED;
+
+	if (plugged_flag_at_mc !=
+	    (mc_dev->obj_desc.state & FSL_MC_OBJ_STATE_PLUGGED)) {
+		if (plugged_flag_at_mc) {
+			mc_dev->obj_desc.state |= FSL_MC_OBJ_STATE_PLUGGED;
+			error = device_attach(&mc_dev->dev);
+			if (error < 0) {
+				dev_err(&mc_dev->dev,
+					"device_attach() failed: %d\n",
+					error);
+			}
+		} else {
+			mc_dev->obj_desc.state &= ~FSL_MC_OBJ_STATE_PLUGGED;
+			device_release_driver(&mc_dev->dev);
+		}
+	}
+}
+
+static void fsl_mc_obj_device_add(struct fsl_mc_device *mc_bus_dev,
+				  struct fsl_mc_obj_desc *obj_desc)
+{
+	int error;
+	struct fsl_mc_device *child_dev;
+
+	/*
+	 * Check if device is already known to Linux:
+	 */
+	child_dev = fsl_mc_device_lookup(obj_desc, mc_bus_dev);
+	if (child_dev) {
+		check_plugged_state_change(child_dev, obj_desc);
+		put_device(&child_dev->dev);
+	} else {
+		error = fsl_mc_device_add(obj_desc, NULL, &mc_bus_dev->dev,
+					  &child_dev);
+		if (error < 0)
+			return;
+	}
+}
+
+/**
+ * dprc_add_new_devices - Adds devices to the logical bus for a DPRC
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ * @obj_desc_array: array of device descriptors for child devices currently
+ * present in the physical DPRC.
+ * @num_child_objects_in_mc: number of entries in obj_desc_array
+ *
+ * Synchronizes the state of the Linux bus driver with the actual
+ * state of the MC by adding objects that have been newly discovered
+ * in the physical DPRC.
+ */
+static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
+				 struct fsl_mc_obj_desc *obj_desc_array,
+				 int num_child_objects_in_mc)
+{
+	int i;
+
+	/* probe the allocable objects first */
+	for (i = 0; i < num_child_objects_in_mc; i++) {
+		struct fsl_mc_obj_desc *obj_desc = &obj_desc_array[i];
+
+		if (strlen(obj_desc->type) > 0 &&
+		    fsl_mc_obj_desc_is_allocatable(obj_desc))
+			fsl_mc_obj_device_add(mc_bus_dev, obj_desc);
+	}
+
+	for (i = 0; i < num_child_objects_in_mc; i++) {
+		struct fsl_mc_obj_desc *obj_desc = &obj_desc_array[i];
+
+		if (strlen(obj_desc->type) > 0 &&
+		    !fsl_mc_obj_desc_is_allocatable(obj_desc))
+			fsl_mc_obj_device_add(mc_bus_dev, obj_desc);
+	}
+}
+
+/**
+ * dprc_scan_objects - Discover objects in a DPRC
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ * @alloc_interrupts: if true the function allocates the interrupt pool,
+ * otherwise the interrupt allocation is delayed
+ *
+ * Detects objects added and removed from a DPRC and synchronizes the
+ * state of the Linux bus driver, MC by adding and removing
+ * devices accordingly.
+ * Two types of devices can be found in a DPRC: allocatable objects (e.g.,
+ * dpbp, dpmcp) and non-allocatable devices (e.g., dprc, dpni).
+ * All allocatable devices needed to be probed before all non-allocatable
+ * devices, to ensure that device drivers for non-allocatable
+ * devices can allocate any type of allocatable devices.
+ * That is, we need to ensure that the corresponding resource pools are
+ * populated before they can get allocation requests from probe callbacks
+ * of the device drivers for the non-allocatable devices.
+ */
+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
+		      bool alloc_interrupts)
+{
+	int num_child_objects;
+	int dprc_get_obj_failures;
+	int error;
+	unsigned int irq_count = mc_bus_dev->obj_desc.irq_count;
+	struct fsl_mc_obj_desc *child_obj_desc_array = NULL;
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
+
+	error = dprc_get_obj_count(mc_bus_dev->mc_io,
+				   0,
+				   mc_bus_dev->mc_handle,
+				   &num_child_objects);
+	if (error < 0) {
+		dev_err(&mc_bus_dev->dev, "dprc_get_obj_count() failed: %d\n",
+			error);
+		return error;
+	}
+
+	if (num_child_objects != 0) {
+		int i;
+
+		child_obj_desc_array =
+		    devm_kmalloc_array(&mc_bus_dev->dev, num_child_objects,
+				       sizeof(*child_obj_desc_array),
+				       GFP_KERNEL);
+		if (!child_obj_desc_array)
+			return -ENOMEM;
+
+		/*
+		 * Discover objects currently present in the physical DPRC:
+		 */
+		dprc_get_obj_failures = 0;
+		for (i = 0; i < num_child_objects; i++) {
+			struct fsl_mc_obj_desc *obj_desc =
+			    &child_obj_desc_array[i];
+
+			error = dprc_get_obj(mc_bus_dev->mc_io,
+					     0,
+					     mc_bus_dev->mc_handle,
+					     i, obj_desc);
+			if (error < 0) {
+				dev_err(&mc_bus_dev->dev,
+					"dprc_get_obj(i=%d) failed: %d\n",
+					i, error);
+				/*
+				 * Mark the obj entry as "invalid", by using the
+				 * empty string as obj type:
+				 */
+				obj_desc->type[0] = '\0';
+				obj_desc->id = error;
+				dprc_get_obj_failures++;
+				continue;
+			}
+
+			/*
+			 * add a quirk for all versions of dpsec < 4.0...none
+			 * are coherent regardless of what the MC reports.
+			 */
+			if ((strcmp(obj_desc->type, "dpseci") == 0) &&
+			    (obj_desc->ver_major < 4))
+				obj_desc->flags |=
+					FSL_MC_OBJ_FLAG_NO_MEM_SHAREABILITY;
+
+			irq_count += obj_desc->irq_count;
+			dev_dbg(&mc_bus_dev->dev,
+				"Discovered object: type %s, id %d\n",
+				obj_desc->type, obj_desc->id);
+		}
+
+		if (dprc_get_obj_failures != 0) {
+			dev_err(&mc_bus_dev->dev,
+				"%d out of %d devices could not be retrieved\n",
+				dprc_get_obj_failures, num_child_objects);
+		}
+	}
+
+	/*
+	 * Allocate IRQ's before binding the scanned devices with their
+	 * respective drivers.
+	 */
+	if (dev_get_msi_domain(&mc_bus_dev->dev)) {
+		if (irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) {
+			dev_warn(&mc_bus_dev->dev,
+				 "IRQs needed (%u) exceed IRQs preallocated (%u)\n",
+				 irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
+		}
+
+		if (alloc_interrupts && !mc_bus->irq_resources) {
+			error = fsl_mc_populate_irq_pool(mc_bus_dev,
+					 FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
+			if (error < 0)
+				return error;
+		}
+	}
+
+	dprc_remove_devices(mc_bus_dev, child_obj_desc_array,
+			    num_child_objects);
+
+	dprc_add_new_devices(mc_bus_dev, child_obj_desc_array,
+			     num_child_objects);
+
+	if (child_obj_desc_array)
+		devm_kfree(&mc_bus_dev->dev, child_obj_desc_array);
+
+	return 0;
+}
+
+/**
+ * dprc_scan_container - Scans a physical DPRC and synchronizes Linux bus state
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ * @alloc_interrupts: if true the function allocates the interrupt pool,
+ *                    otherwise the interrupt allocation is delayed
+ * Scans the physical DPRC and synchronizes the state of the Linux
+ * bus driver with the actual state of the MC by adding and removing
+ * devices as appropriate.
+ */
+int dprc_scan_container(struct fsl_mc_device *mc_bus_dev,
+			bool alloc_interrupts)
+{
+	int error = 0;
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
+
+	fsl_mc_init_all_resource_pools(mc_bus_dev);
+
+	/*
+	 * Discover objects in the DPRC:
+	 */
+	mutex_lock(&mc_bus->scan_mutex);
+	error = dprc_scan_objects(mc_bus_dev, alloc_interrupts);
+	mutex_unlock(&mc_bus->scan_mutex);
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(dprc_scan_container);
+
+/**
+ * dprc_irq0_handler - Regular ISR for DPRC interrupt 0
+ *
+ * @irq_num: IRQ number of the interrupt being handled
+ * @arg: Pointer to device structure
+ */
+static irqreturn_t dprc_irq0_handler(int irq_num, void *arg)
+{
+	return IRQ_WAKE_THREAD;
+}
+
+/**
+ * dprc_irq0_handler_thread - Handler thread function for DPRC interrupt 0
+ *
+ * @irq_num: IRQ number of the interrupt being handled
+ * @arg: Pointer to device structure
+ */
+static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg)
+{
+	int error;
+	u32 status;
+	struct device *dev = arg;
+	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+	struct fsl_mc_io *mc_io = mc_dev->mc_io;
+	int irq = mc_dev->irqs[0]->virq;
+
+	dev_dbg(dev, "DPRC IRQ %d triggered on CPU %u\n",
+		irq_num, smp_processor_id());
+
+	if (!(mc_dev->flags & FSL_MC_IS_DPRC))
+		return IRQ_HANDLED;
+
+	mutex_lock(&mc_bus->scan_mutex);
+	if (irq != (u32)irq_num)
+		goto out;
+
+	status = 0;
+	error = dprc_get_irq_status(mc_io, 0, mc_dev->mc_handle, 0,
+				    &status);
+	if (error < 0) {
+		dev_err(dev,
+			"dprc_get_irq_status() failed: %d\n", error);
+		goto out;
+	}
+
+	error = dprc_clear_irq_status(mc_io, 0, mc_dev->mc_handle, 0,
+				      status);
+	if (error < 0) {
+		dev_err(dev,
+			"dprc_clear_irq_status() failed: %d\n", error);
+		goto out;
+	}
+
+	if (status & (DPRC_IRQ_EVENT_OBJ_ADDED |
+		      DPRC_IRQ_EVENT_OBJ_REMOVED |
+		      DPRC_IRQ_EVENT_CONTAINER_DESTROYED |
+		      DPRC_IRQ_EVENT_OBJ_DESTROYED |
+		      DPRC_IRQ_EVENT_OBJ_CREATED)) {
+
+		error = dprc_scan_objects(mc_dev, true);
+		if (error < 0) {
+			/*
+			 * If the error is -ENXIO, we ignore it, as it indicates
+			 * that the object scan was aborted, as we detected that
+			 * an object was removed from the DPRC in the MC, while
+			 * we were scanning the DPRC.
+			 */
+			if (error != -ENXIO) {
+				dev_err(dev, "dprc_scan_objects() failed: %d\n",
+					error);
+			}
+
+			goto out;
+		}
+	}
+
+out:
+	mutex_unlock(&mc_bus->scan_mutex);
+	return IRQ_HANDLED;
+}
+
+/*
+ * Disable and clear interrupt for a given DPRC object
+ */
+int disable_dprc_irq(struct fsl_mc_device *mc_dev)
+{
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+	int error;
+	struct fsl_mc_io *mc_io = mc_dev->mc_io;
+
+	/*
+	 * Disable generation of interrupt, while we configure it:
+	 */
+	error = dprc_set_irq_enable(mc_io, 0, mc_dev->mc_handle, 0, 0);
+	if (error < 0) {
+		dev_err(&mc_dev->dev,
+			"Disabling DPRC IRQ failed: dprc_set_irq_enable() failed: %d\n",
+			error);
+		return error;
+	}
+
+	/*
+	 * Disable all interrupt causes for the interrupt:
+	 */
+	error = dprc_set_irq_mask(mc_io, 0, mc_dev->mc_handle, 0, 0x0);
+	if (error < 0) {
+		dev_err(&mc_dev->dev,
+			"Disabling DPRC IRQ failed: dprc_set_irq_mask() failed: %d\n",
+			error);
+		return error;
+	}
+
+	/*
+	 * Clear any leftover interrupts:
+	 */
+	error = dprc_clear_irq_status(mc_io, 0, mc_dev->mc_handle, 0, ~0x0U);
+	if (error < 0) {
+		dev_err(&mc_dev->dev,
+			"Disabling DPRC IRQ failed: dprc_clear_irq_status() failed: %d\n",
+			error);
+		return error;
+	}
+
+	mc_bus->irq_enabled = 0;
+
+	return 0;
+}
+
+int get_dprc_irq_state(struct fsl_mc_device *mc_dev)
+{
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+
+	return mc_bus->irq_enabled;
+}
+
+static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev)
+{
+	int error;
+	struct fsl_mc_device_irq *irq = mc_dev->irqs[0];
+
+	/*
+	 * NOTE: devm_request_threaded_irq() invokes the device-specific
+	 * function that programs the MSI physically in the device
+	 */
+	error = devm_request_threaded_irq(&mc_dev->dev,
+					  irq->virq,
+					  dprc_irq0_handler,
+					  dprc_irq0_handler_thread,
+					  IRQF_NO_SUSPEND | IRQF_ONESHOT,
+					  dev_name(&mc_dev->dev),
+					  &mc_dev->dev);
+	if (error < 0) {
+		dev_err(&mc_dev->dev,
+			"devm_request_threaded_irq() failed: %d\n",
+			error);
+		return error;
+	}
+
+	return 0;
+}
+
+int enable_dprc_irq(struct fsl_mc_device *mc_dev)
+{
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+	int error;
+
+	/*
+	 * Enable all interrupt causes for the interrupt:
+	 */
+	error = dprc_set_irq_mask(mc_dev->mc_io, 0, mc_dev->mc_handle, 0,
+				  ~0x0u);
+	if (error < 0) {
+		dev_err(&mc_dev->dev,
+			"Enabling DPRC IRQ failed: dprc_set_irq_mask() failed: %d\n",
+			error);
+
+		return error;
+	}
+
+	/*
+	 * Enable generation of the interrupt:
+	 */
+	error = dprc_set_irq_enable(mc_dev->mc_io, 0, mc_dev->mc_handle, 0, 1);
+	if (error < 0) {
+		dev_err(&mc_dev->dev,
+			"Enabling DPRC IRQ failed: dprc_set_irq_enable() failed: %d\n",
+			error);
+
+		return error;
+	}
+
+	mc_bus->irq_enabled = 1;
+
+	return 0;
+}
+
+/*
+ * Setup interrupt for a given DPRC device
+ */
+static int dprc_setup_irq(struct fsl_mc_device *mc_dev)
+{
+	int error;
+
+	error = fsl_mc_allocate_irqs(mc_dev);
+	if (error < 0)
+		return error;
+
+	error = disable_dprc_irq(mc_dev);
+	if (error < 0)
+		goto error_free_irqs;
+
+	error = register_dprc_irq_handler(mc_dev);
+	if (error < 0)
+		goto error_free_irqs;
+
+	error = enable_dprc_irq(mc_dev);
+	if (error < 0)
+		goto error_free_irqs;
+
+	return 0;
+
+error_free_irqs:
+	fsl_mc_free_irqs(mc_dev);
+	return error;
+}
+
+/**
+ * dprc_setup - opens and creates a mc_io for DPRC
+ *
+ * @mc_dev: Pointer to fsl-mc device representing a DPRC
+ *
+ * It opens the physical DPRC in the MC.
+ * It configures the DPRC portal used to communicate with MC
+ */
+
+int dprc_setup(struct fsl_mc_device *mc_dev)
+{
+	struct device *parent_dev = mc_dev->dev.parent;
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+	struct irq_domain *mc_msi_domain;
+	bool mc_io_created = false;
+	bool msi_domain_set = false;
+	bool uapi_created = false;
+	u16 major_ver, minor_ver;
+	size_t region_size;
+	int error;
+
+	if (!is_fsl_mc_bus_dprc(mc_dev))
+		return -EINVAL;
+
+	if (dev_get_msi_domain(&mc_dev->dev))
+		return -EINVAL;
+
+	if (!mc_dev->mc_io) {
+		/*
+		 * This is a child DPRC:
+		 */
+		if (!dev_is_fsl_mc(parent_dev))
+			return -EINVAL;
+
+		if (mc_dev->obj_desc.region_count == 0)
+			return -EINVAL;
+
+		region_size = resource_size(mc_dev->regions);
+
+		error = fsl_create_mc_io(&mc_dev->dev,
+					 mc_dev->regions[0].start,
+					 region_size,
+					 NULL,
+					 FSL_MC_IO_ATOMIC_CONTEXT_PORTAL,
+					 &mc_dev->mc_io);
+		if (error < 0)
+			return error;
+
+		mc_io_created = true;
+	} else {
+		error = fsl_mc_uapi_create_device_file(mc_bus);
+		if (error < 0)
+			return -EPROBE_DEFER;
+		uapi_created = true;
+	}
+
+	mc_msi_domain = fsl_mc_find_msi_domain(&mc_dev->dev);
+	if (!mc_msi_domain) {
+		dev_warn(&mc_dev->dev,
+			 "WARNING: MC bus without interrupt support\n");
+	} else {
+		dev_set_msi_domain(&mc_dev->dev, mc_msi_domain);
+		msi_domain_set = true;
+	}
+
+	error = dprc_open(mc_dev->mc_io, 0, mc_dev->obj_desc.id,
+			  &mc_dev->mc_handle);
+	if (error < 0) {
+		dev_err(&mc_dev->dev, "dprc_open() failed: %d\n", error);
+		goto error_cleanup_msi_domain;
+	}
+
+	error = dprc_get_attributes(mc_dev->mc_io, 0, mc_dev->mc_handle,
+				    &mc_bus->dprc_attr);
+	if (error < 0) {
+		dev_err(&mc_dev->dev, "dprc_get_attributes() failed: %d\n",
+			error);
+		goto error_cleanup_open;
+	}
+
+	error = dprc_get_api_version(mc_dev->mc_io, 0,
+				     &major_ver,
+				     &minor_ver);
+	if (error < 0) {
+		dev_err(&mc_dev->dev, "dprc_get_api_version() failed: %d\n",
+			error);
+		goto error_cleanup_open;
+	}
+
+	if (major_ver < DPRC_MIN_VER_MAJOR) {
+		dev_err(&mc_dev->dev,
+			"ERROR: DPRC version %d.%d not supported\n",
+			major_ver, minor_ver);
+		error = -ENOTSUPP;
+		goto error_cleanup_open;
+	}
+
+	return 0;
+
+error_cleanup_open:
+	(void)dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
+
+error_cleanup_msi_domain:
+	if (msi_domain_set)
+		dev_set_msi_domain(&mc_dev->dev, NULL);
+
+	if (mc_io_created) {
+		fsl_destroy_mc_io(mc_dev->mc_io);
+		mc_dev->mc_io = NULL;
+	}
+
+	if (uapi_created)
+		fsl_mc_uapi_remove_device_file(mc_bus);
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(dprc_setup);
+
+/**
+ * dprc_probe - callback invoked when a DPRC is being bound to this driver
+ *
+ * @mc_dev: Pointer to fsl-mc device representing a DPRC
+ *
+ * It opens the physical DPRC in the MC.
+ * It scans the DPRC to discover the MC objects contained in it.
+ * It creates the interrupt pool for the MC bus associated with the DPRC.
+ * It configures the interrupts for the DPRC device itself.
+ */
+static int dprc_probe(struct fsl_mc_device *mc_dev)
+{
+	int error;
+
+	error = dprc_setup(mc_dev);
+	if (error < 0)
+		return error;
+
+	/*
+	 * Discover MC objects in DPRC object:
+	 */
+	error = dprc_scan_container(mc_dev, true);
+	if (error < 0)
+		goto dprc_cleanup;
+
+	/*
+	 * Configure interrupt for the DPRC object associated with this MC bus:
+	 */
+	error = dprc_setup_irq(mc_dev);
+	if (error < 0)
+		goto scan_cleanup;
+
+	dev_info(&mc_dev->dev, "DPRC device bound to driver");
+	return 0;
+
+scan_cleanup:
+	device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
+dprc_cleanup:
+	dprc_cleanup(mc_dev);
+	return error;
+}
+
+/*
+ * Tear down interrupt for a given DPRC object
+ */
+static void dprc_teardown_irq(struct fsl_mc_device *mc_dev)
+{
+	struct fsl_mc_device_irq *irq = mc_dev->irqs[0];
+
+	(void)disable_dprc_irq(mc_dev);
+
+	devm_free_irq(&mc_dev->dev, irq->virq, &mc_dev->dev);
+
+	fsl_mc_free_irqs(mc_dev);
+}
+
+/**
+ * dprc_cleanup - function that cleanups a DPRC
+ *
+ * @mc_dev: Pointer to fsl-mc device representing the DPRC
+ *
+ * It closes the DPRC device in the MC.
+ * It destroys the interrupt pool associated with this MC bus.
+ */
+
+int dprc_cleanup(struct fsl_mc_device *mc_dev)
+{
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+	int error;
+
+	/* this function should be called only for DPRCs, it
+	 * is an error to call it for regular objects
+	 */
+	if (!is_fsl_mc_bus_dprc(mc_dev))
+		return -EINVAL;
+
+	if (dev_get_msi_domain(&mc_dev->dev)) {
+		fsl_mc_cleanup_irq_pool(mc_dev);
+		dev_set_msi_domain(&mc_dev->dev, NULL);
+	}
+
+	fsl_mc_cleanup_all_resource_pools(mc_dev);
+
+	/* if this step fails we cannot go further with cleanup as there is no way of
+	 * communicating with the firmware
+	 */
+	if (!mc_dev->mc_io) {
+		dev_err(&mc_dev->dev, "mc_io is NULL, tear down cannot be performed in firmware\n");
+		return -EINVAL;
+	}
+
+	error = dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
+	if (error < 0)
+		dev_err(&mc_dev->dev, "dprc_close() failed: %d\n", error);
+
+	if (!fsl_mc_is_root_dprc(&mc_dev->dev)) {
+		fsl_destroy_mc_io(mc_dev->mc_io);
+		mc_dev->mc_io = NULL;
+	} else {
+		fsl_mc_uapi_remove_device_file(mc_bus);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dprc_cleanup);
+
+/**
+ * dprc_remove - callback invoked when a DPRC is being unbound from this driver
+ *
+ * @mc_dev: Pointer to fsl-mc device representing the DPRC
+ *
+ * It removes the DPRC's child objects from Linux (not from the MC) and
+ * closes the DPRC device in the MC.
+ * It tears down the interrupts that were configured for the DPRC device.
+ * It destroys the interrupt pool associated with this MC bus.
+ */
+static int dprc_remove(struct fsl_mc_device *mc_dev)
+{
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+
+	if (!is_fsl_mc_bus_dprc(mc_dev))
+		return -EINVAL;
+
+	if (!mc_bus->irq_resources)
+		return -EINVAL;
+
+	if (dev_get_msi_domain(&mc_dev->dev))
+		dprc_teardown_irq(mc_dev);
+
+	device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
+
+	dprc_cleanup(mc_dev);
+
+	dev_info(&mc_dev->dev, "DPRC device unbound from driver");
+	return 0;
+}
+
+static const struct fsl_mc_device_id match_id_table[] = {
+	{
+	 .vendor = FSL_MC_VENDOR_FREESCALE,
+	 .obj_type = "dprc"},
+	{.vendor = 0x0},
+};
+
+static struct fsl_mc_driver dprc_driver = {
+	.driver = {
+		   .name = FSL_MC_DPRC_DRIVER_NAME,
+		   .owner = THIS_MODULE,
+		   .pm = NULL,
+		   },
+	.match_id_table = match_id_table,
+	.probe = dprc_probe,
+	.remove = dprc_remove,
+};
+
+int __init dprc_driver_init(void)
+{
+	return fsl_mc_driver_register(&dprc_driver);
+}
+
+void dprc_driver_exit(void)
+{
+	fsl_mc_driver_unregister(&dprc_driver);
+}