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, 445 insertions, 0 deletions

diff --git a/drivers/misc/habanalabs/common/context.c b/drivers/misc/habanalabs/common/context.c
new file mode 100644
index 000000000..9c8b1b37b
--- /dev/null
+++ b/drivers/misc/habanalabs/common/context.c
@@ -0,0 +1,445 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2016-2021 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ */
+
+#include "habanalabs.h"
+
+#include <linux/slab.h>
+
+static void encaps_handle_do_release(struct hl_cs_encaps_sig_handle *handle, bool put_hw_sob,
+					bool put_ctx)
+{
+	struct hl_encaps_signals_mgr *mgr = &handle->ctx->sig_mgr;
+
+	if (put_hw_sob)
+		hw_sob_put(handle->hw_sob);
+
+	spin_lock(&mgr->lock);
+	idr_remove(&mgr->handles, handle->id);
+	spin_unlock(&mgr->lock);
+
+	if (put_ctx)
+		hl_ctx_put(handle->ctx);
+
+	kfree(handle);
+}
+
+void hl_encaps_release_handle_and_put_ctx(struct kref *ref)
+{
+	struct hl_cs_encaps_sig_handle *handle =
+			container_of(ref, struct hl_cs_encaps_sig_handle, refcount);
+
+	encaps_handle_do_release(handle, false, true);
+}
+
+static void hl_encaps_release_handle_and_put_sob(struct kref *ref)
+{
+	struct hl_cs_encaps_sig_handle *handle =
+			container_of(ref, struct hl_cs_encaps_sig_handle, refcount);
+
+	encaps_handle_do_release(handle, true, false);
+}
+
+void hl_encaps_release_handle_and_put_sob_ctx(struct kref *ref)
+{
+	struct hl_cs_encaps_sig_handle *handle =
+			container_of(ref, struct hl_cs_encaps_sig_handle, refcount);
+
+	encaps_handle_do_release(handle, true, true);
+}
+
+static void hl_encaps_sig_mgr_init(struct hl_encaps_signals_mgr *mgr)
+{
+	spin_lock_init(&mgr->lock);
+	idr_init(&mgr->handles);
+}
+
+static void hl_encaps_sig_mgr_fini(struct hl_device *hdev, struct hl_encaps_signals_mgr *mgr)
+{
+	struct hl_cs_encaps_sig_handle *handle;
+	struct idr *idp;
+	u32 id;
+
+	idp = &mgr->handles;
+
+	/* The IDR is expected to be empty at this stage, because any left signal should have been
+	 * released as part of CS roll-back.
+	 */
+	if (!idr_is_empty(idp)) {
+		dev_warn(hdev->dev,
+			"device released while some encaps signals handles are still allocated\n");
+		idr_for_each_entry(idp, handle, id)
+			kref_put(&handle->refcount, hl_encaps_release_handle_and_put_sob);
+	}
+
+	idr_destroy(&mgr->handles);
+}
+
+static void hl_ctx_fini(struct hl_ctx *ctx)
+{
+	struct hl_device *hdev = ctx->hdev;
+	int i;
+
+	/* Release all allocated HW block mapped list entries and destroy
+	 * the mutex.
+	 */
+	hl_hw_block_mem_fini(ctx);
+
+	/*
+	 * If we arrived here, there are no jobs waiting for this context
+	 * on its queues so we can safely remove it.
+	 * This is because for each CS, we increment the ref count and for
+	 * every CS that was finished we decrement it and we won't arrive
+	 * to this function unless the ref count is 0
+	 */
+
+	for (i = 0 ; i < hdev->asic_prop.max_pending_cs ; i++)
+		hl_fence_put(ctx->cs_pending[i]);
+
+	kfree(ctx->cs_pending);
+
+	if (ctx->asid != HL_KERNEL_ASID_ID) {
+		dev_dbg(hdev->dev, "closing user context %d\n", ctx->asid);
+
+		/* The engines are stopped as there is no executing CS, but the
+		 * Coresight might be still working by accessing addresses
+		 * related to the stopped engines. Hence stop it explicitly.
+		 */
+		if (hdev->in_debug)
+			hl_device_set_debug_mode(hdev, ctx, false);
+
+		hdev->asic_funcs->ctx_fini(ctx);
+
+		hl_dec_ctx_fini(ctx);
+
+		hl_cb_va_pool_fini(ctx);
+		hl_vm_ctx_fini(ctx);
+		hl_asid_free(hdev, ctx->asid);
+		hl_encaps_sig_mgr_fini(hdev, &ctx->sig_mgr);
+	} else {
+		dev_dbg(hdev->dev, "closing kernel context\n");
+		hdev->asic_funcs->ctx_fini(ctx);
+		hl_vm_ctx_fini(ctx);
+		hl_mmu_ctx_fini(ctx);
+	}
+}
+
+void hl_ctx_do_release(struct kref *ref)
+{
+	struct hl_ctx *ctx;
+
+	ctx = container_of(ref, struct hl_ctx, refcount);
+
+	hl_ctx_fini(ctx);
+
+	if (ctx->hpriv) {
+		struct hl_fpriv *hpriv = ctx->hpriv;
+
+		mutex_lock(&hpriv->ctx_lock);
+		hpriv->ctx = NULL;
+		mutex_unlock(&hpriv->ctx_lock);
+
+		hl_hpriv_put(hpriv);
+	}
+
+	kfree(ctx);
+}
+
+int hl_ctx_create(struct hl_device *hdev, struct hl_fpriv *hpriv)
+{
+	struct hl_ctx_mgr *ctx_mgr = &hpriv->ctx_mgr;
+	struct hl_ctx *ctx;
+	int rc;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx) {
+		rc = -ENOMEM;
+		goto out_err;
+	}
+
+	mutex_lock(&ctx_mgr->lock);
+	rc = idr_alloc(&ctx_mgr->handles, ctx, 1, 0, GFP_KERNEL);
+	mutex_unlock(&ctx_mgr->lock);
+
+	if (rc < 0) {
+		dev_err(hdev->dev, "Failed to allocate IDR for a new CTX\n");
+		goto free_ctx;
+	}
+
+	ctx->handle = rc;
+
+	rc = hl_ctx_init(hdev, ctx, false);
+	if (rc)
+		goto remove_from_idr;
+
+	hl_hpriv_get(hpriv);
+	ctx->hpriv = hpriv;
+
+	/* TODO: remove for multiple contexts per process */
+	hpriv->ctx = ctx;
+
+	/* TODO: remove the following line for multiple process support */
+	hdev->is_compute_ctx_active = true;
+
+	return 0;
+
+remove_from_idr:
+	mutex_lock(&ctx_mgr->lock);
+	idr_remove(&ctx_mgr->handles, ctx->handle);
+	mutex_unlock(&ctx_mgr->lock);
+free_ctx:
+	kfree(ctx);
+out_err:
+	return rc;
+}
+
+int hl_ctx_init(struct hl_device *hdev, struct hl_ctx *ctx, bool is_kernel_ctx)
+{
+	int rc = 0, i;
+
+	ctx->hdev = hdev;
+
+	kref_init(&ctx->refcount);
+
+	ctx->cs_sequence = 1;
+	spin_lock_init(&ctx->cs_lock);
+	atomic_set(&ctx->thread_ctx_switch_token, 1);
+	ctx->thread_ctx_switch_wait_token = 0;
+	ctx->cs_pending = kcalloc(hdev->asic_prop.max_pending_cs,
+				sizeof(struct hl_fence *),
+				GFP_KERNEL);
+	if (!ctx->cs_pending)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&ctx->outcome_store.used_list);
+	INIT_LIST_HEAD(&ctx->outcome_store.free_list);
+	hash_init(ctx->outcome_store.outcome_map);
+	for (i = 0; i < ARRAY_SIZE(ctx->outcome_store.nodes_pool); ++i)
+		list_add(&ctx->outcome_store.nodes_pool[i].list_link,
+			 &ctx->outcome_store.free_list);
+
+	hl_hw_block_mem_init(ctx);
+
+	if (is_kernel_ctx) {
+		ctx->asid = HL_KERNEL_ASID_ID; /* Kernel driver gets ASID 0 */
+		rc = hl_vm_ctx_init(ctx);
+		if (rc) {
+			dev_err(hdev->dev, "Failed to init mem ctx module\n");
+			rc = -ENOMEM;
+			goto err_hw_block_mem_fini;
+		}
+
+		rc = hdev->asic_funcs->ctx_init(ctx);
+		if (rc) {
+			dev_err(hdev->dev, "ctx_init failed\n");
+			goto err_vm_ctx_fini;
+		}
+	} else {
+		ctx->asid = hl_asid_alloc(hdev);
+		if (!ctx->asid) {
+			dev_err(hdev->dev, "No free ASID, failed to create context\n");
+			rc = -ENOMEM;
+			goto err_hw_block_mem_fini;
+		}
+
+		rc = hl_vm_ctx_init(ctx);
+		if (rc) {
+			dev_err(hdev->dev, "Failed to init mem ctx module\n");
+			rc = -ENOMEM;
+			goto err_asid_free;
+		}
+
+		rc = hl_cb_va_pool_init(ctx);
+		if (rc) {
+			dev_err(hdev->dev,
+				"Failed to init VA pool for mapped CB\n");
+			goto err_vm_ctx_fini;
+		}
+
+		rc = hdev->asic_funcs->ctx_init(ctx);
+		if (rc) {
+			dev_err(hdev->dev, "ctx_init failed\n");
+			goto err_cb_va_pool_fini;
+		}
+
+		hl_encaps_sig_mgr_init(&ctx->sig_mgr);
+
+		dev_dbg(hdev->dev, "create user context %d\n", ctx->asid);
+	}
+
+	return 0;
+
+err_cb_va_pool_fini:
+	hl_cb_va_pool_fini(ctx);
+err_vm_ctx_fini:
+	hl_vm_ctx_fini(ctx);
+err_asid_free:
+	if (ctx->asid != HL_KERNEL_ASID_ID)
+		hl_asid_free(hdev, ctx->asid);
+err_hw_block_mem_fini:
+	hl_hw_block_mem_fini(ctx);
+	kfree(ctx->cs_pending);
+
+	return rc;
+}
+
+static int hl_ctx_get_unless_zero(struct hl_ctx *ctx)
+{
+	return kref_get_unless_zero(&ctx->refcount);
+}
+
+void hl_ctx_get(struct hl_ctx *ctx)
+{
+	kref_get(&ctx->refcount);
+}
+
+int hl_ctx_put(struct hl_ctx *ctx)
+{
+	return kref_put(&ctx->refcount, hl_ctx_do_release);
+}
+
+struct hl_ctx *hl_get_compute_ctx(struct hl_device *hdev)
+{
+	struct hl_ctx *ctx = NULL;
+	struct hl_fpriv *hpriv;
+
+	mutex_lock(&hdev->fpriv_list_lock);
+
+	list_for_each_entry(hpriv, &hdev->fpriv_list, dev_node) {
+		mutex_lock(&hpriv->ctx_lock);
+		ctx = hpriv->ctx;
+		if (ctx && !hl_ctx_get_unless_zero(ctx))
+			ctx = NULL;
+		mutex_unlock(&hpriv->ctx_lock);
+
+		/* There can only be a single user which has opened the compute device, so exit
+		 * immediately once we find its context or if we see that it has been released
+		 */
+		break;
+	}
+
+	mutex_unlock(&hdev->fpriv_list_lock);
+
+	return ctx;
+}
+
+/*
+ * hl_ctx_get_fence_locked - get CS fence under CS lock
+ *
+ * @ctx: pointer to the context structure.
+ * @seq: CS sequences number
+ *
+ * @return valid fence pointer on success, NULL if fence is gone, otherwise
+ *         error pointer.
+ *
+ * NOTE: this function shall be called with cs_lock locked
+ */
+static struct hl_fence *hl_ctx_get_fence_locked(struct hl_ctx *ctx, u64 seq)
+{
+	struct asic_fixed_properties *asic_prop = &ctx->hdev->asic_prop;
+	struct hl_fence *fence;
+
+	if (seq >= ctx->cs_sequence)
+		return ERR_PTR(-EINVAL);
+
+	if (seq + asic_prop->max_pending_cs < ctx->cs_sequence)
+		return NULL;
+
+	fence = ctx->cs_pending[seq & (asic_prop->max_pending_cs - 1)];
+	hl_fence_get(fence);
+	return fence;
+}
+
+struct hl_fence *hl_ctx_get_fence(struct hl_ctx *ctx, u64 seq)
+{
+	struct hl_fence *fence;
+
+	spin_lock(&ctx->cs_lock);
+
+	fence = hl_ctx_get_fence_locked(ctx, seq);
+
+	spin_unlock(&ctx->cs_lock);
+
+	return fence;
+}
+
+/*
+ * hl_ctx_get_fences - get multiple CS fences under the same CS lock
+ *
+ * @ctx: pointer to the context structure.
+ * @seq_arr: array of CS sequences to wait for
+ * @fence: fence array to store the CS fences
+ * @arr_len: length of seq_arr and fence_arr
+ *
+ * @return 0 on success, otherwise non 0 error code
+ */
+int hl_ctx_get_fences(struct hl_ctx *ctx, u64 *seq_arr,
+				struct hl_fence **fence, u32 arr_len)
+{
+	struct hl_fence **fence_arr_base = fence;
+	int i, rc = 0;
+
+	spin_lock(&ctx->cs_lock);
+
+	for (i = 0; i < arr_len; i++, fence++) {
+		u64 seq = seq_arr[i];
+
+		*fence = hl_ctx_get_fence_locked(ctx, seq);
+
+		if (IS_ERR(*fence)) {
+			dev_err(ctx->hdev->dev,
+				"Failed to get fence for CS with seq 0x%llx\n",
+					seq);
+			rc = PTR_ERR(*fence);
+			break;
+		}
+	}
+
+	spin_unlock(&ctx->cs_lock);
+
+	if (rc)
+		hl_fences_put(fence_arr_base, i);
+
+	return rc;
+}
+
+/*
+ * hl_ctx_mgr_init - initialize the context manager
+ *
+ * @ctx_mgr: pointer to context manager structure
+ *
+ * This manager is an object inside the hpriv object of the user process.
+ * The function is called when a user process opens the FD.
+ */
+void hl_ctx_mgr_init(struct hl_ctx_mgr *ctx_mgr)
+{
+	mutex_init(&ctx_mgr->lock);
+	idr_init(&ctx_mgr->handles);
+}
+
+/*
+ * hl_ctx_mgr_fini - finalize the context manager
+ *
+ * @hdev: pointer to device structure
+ * @ctx_mgr: pointer to context manager structure
+ *
+ * This function goes over all the contexts in the manager and frees them.
+ * It is called when a process closes the FD.
+ */
+void hl_ctx_mgr_fini(struct hl_device *hdev, struct hl_ctx_mgr *ctx_mgr)
+{
+	struct hl_ctx *ctx;
+	struct idr *idp;
+	u32 id;
+
+	idp = &ctx_mgr->handles;
+
+	idr_for_each_entry(idp, ctx, id)
+		kref_put(&ctx->refcount, hl_ctx_do_release);
+
+	idr_destroy(&ctx_mgr->handles);
+	mutex_destroy(&ctx_mgr->lock);
+}