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, 493 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.c b/drivers/gpu/drm/i915/gt/intel_timeline.c
new file mode 100644
index 000000000..b9640212d
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_timeline.c
@@ -0,0 +1,493 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2016-2018 Intel Corporation
+ */
+
+#include <drm/drm_cache.h>
+
+#include "gem/i915_gem_internal.h"
+
+#include "i915_active.h"
+#include "i915_drv.h"
+#include "i915_syncmap.h"
+#include "intel_gt.h"
+#include "intel_ring.h"
+#include "intel_timeline.h"
+
+#define TIMELINE_SEQNO_BYTES 8
+
+static struct i915_vma *hwsp_alloc(struct intel_gt *gt)
+{
+	struct drm_i915_private *i915 = gt->i915;
+	struct drm_i915_gem_object *obj;
+	struct i915_vma *vma;
+
+	obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
+	if (IS_ERR(obj))
+		return ERR_CAST(obj);
+
+	i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC);
+
+	vma = i915_vma_instance(obj, &gt->ggtt->vm, NULL);
+	if (IS_ERR(vma))
+		i915_gem_object_put(obj);
+
+	return vma;
+}
+
+static void __timeline_retire(struct i915_active *active)
+{
+	struct intel_timeline *tl =
+		container_of(active, typeof(*tl), active);
+
+	i915_vma_unpin(tl->hwsp_ggtt);
+	intel_timeline_put(tl);
+}
+
+static int __timeline_active(struct i915_active *active)
+{
+	struct intel_timeline *tl =
+		container_of(active, typeof(*tl), active);
+
+	__i915_vma_pin(tl->hwsp_ggtt);
+	intel_timeline_get(tl);
+	return 0;
+}
+
+I915_SELFTEST_EXPORT int
+intel_timeline_pin_map(struct intel_timeline *timeline)
+{
+	struct drm_i915_gem_object *obj = timeline->hwsp_ggtt->obj;
+	u32 ofs = offset_in_page(timeline->hwsp_offset);
+	void *vaddr;
+
+	vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
+	if (IS_ERR(vaddr))
+		return PTR_ERR(vaddr);
+
+	timeline->hwsp_map = vaddr;
+	timeline->hwsp_seqno = memset(vaddr + ofs, 0, TIMELINE_SEQNO_BYTES);
+	drm_clflush_virt_range(vaddr + ofs, TIMELINE_SEQNO_BYTES);
+
+	return 0;
+}
+
+static int intel_timeline_init(struct intel_timeline *timeline,
+			       struct intel_gt *gt,
+			       struct i915_vma *hwsp,
+			       unsigned int offset)
+{
+	kref_init(&timeline->kref);
+	atomic_set(&timeline->pin_count, 0);
+
+	timeline->gt = gt;
+
+	if (hwsp) {
+		timeline->hwsp_offset = offset;
+		timeline->hwsp_ggtt = i915_vma_get(hwsp);
+	} else {
+		timeline->has_initial_breadcrumb = true;
+		hwsp = hwsp_alloc(gt);
+		if (IS_ERR(hwsp))
+			return PTR_ERR(hwsp);
+		timeline->hwsp_ggtt = hwsp;
+	}
+
+	timeline->hwsp_map = NULL;
+	timeline->hwsp_seqno = (void *)(long)timeline->hwsp_offset;
+
+	GEM_BUG_ON(timeline->hwsp_offset >= hwsp->size);
+
+	timeline->fence_context = dma_fence_context_alloc(1);
+
+	mutex_init(&timeline->mutex);
+
+	INIT_ACTIVE_FENCE(&timeline->last_request);
+	INIT_LIST_HEAD(&timeline->requests);
+
+	i915_syncmap_init(&timeline->sync);
+	i915_active_init(&timeline->active, __timeline_active,
+			 __timeline_retire, 0);
+
+	return 0;
+}
+
+void intel_gt_init_timelines(struct intel_gt *gt)
+{
+	struct intel_gt_timelines *timelines = &gt->timelines;
+
+	spin_lock_init(&timelines->lock);
+	INIT_LIST_HEAD(&timelines->active_list);
+}
+
+static void intel_timeline_fini(struct rcu_head *rcu)
+{
+	struct intel_timeline *timeline =
+		container_of(rcu, struct intel_timeline, rcu);
+
+	if (timeline->hwsp_map)
+		i915_gem_object_unpin_map(timeline->hwsp_ggtt->obj);
+
+	i915_vma_put(timeline->hwsp_ggtt);
+	i915_active_fini(&timeline->active);
+
+	/*
+	 * A small race exists between intel_gt_retire_requests_timeout and
+	 * intel_timeline_exit which could result in the syncmap not getting
+	 * free'd. Rather than work to hard to seal this race, simply cleanup
+	 * the syncmap on fini.
+	 */
+	i915_syncmap_free(&timeline->sync);
+
+	kfree(timeline);
+}
+
+struct intel_timeline *
+__intel_timeline_create(struct intel_gt *gt,
+			struct i915_vma *global_hwsp,
+			unsigned int offset)
+{
+	struct intel_timeline *timeline;
+	int err;
+
+	timeline = kzalloc(sizeof(*timeline), GFP_KERNEL);
+	if (!timeline)
+		return ERR_PTR(-ENOMEM);
+
+	err = intel_timeline_init(timeline, gt, global_hwsp, offset);
+	if (err) {
+		kfree(timeline);
+		return ERR_PTR(err);
+	}
+
+	return timeline;
+}
+
+struct intel_timeline *
+intel_timeline_create_from_engine(struct intel_engine_cs *engine,
+				  unsigned int offset)
+{
+	struct i915_vma *hwsp = engine->status_page.vma;
+	struct intel_timeline *tl;
+
+	tl = __intel_timeline_create(engine->gt, hwsp, offset);
+	if (IS_ERR(tl))
+		return tl;
+
+	/* Borrow a nearby lock; we only create these timelines during init */
+	mutex_lock(&hwsp->vm->mutex);
+	list_add_tail(&tl->engine_link, &engine->status_page.timelines);
+	mutex_unlock(&hwsp->vm->mutex);
+
+	return tl;
+}
+
+void __intel_timeline_pin(struct intel_timeline *tl)
+{
+	GEM_BUG_ON(!atomic_read(&tl->pin_count));
+	atomic_inc(&tl->pin_count);
+}
+
+int intel_timeline_pin(struct intel_timeline *tl, struct i915_gem_ww_ctx *ww)
+{
+	int err;
+
+	if (atomic_add_unless(&tl->pin_count, 1, 0))
+		return 0;
+
+	if (!tl->hwsp_map) {
+		err = intel_timeline_pin_map(tl);
+		if (err)
+			return err;
+	}
+
+	err = i915_ggtt_pin(tl->hwsp_ggtt, ww, 0, PIN_HIGH);
+	if (err)
+		return err;
+
+	tl->hwsp_offset =
+		i915_ggtt_offset(tl->hwsp_ggtt) +
+		offset_in_page(tl->hwsp_offset);
+	GT_TRACE(tl->gt, "timeline:%llx using HWSP offset:%x\n",
+		 tl->fence_context, tl->hwsp_offset);
+
+	i915_active_acquire(&tl->active);
+	if (atomic_fetch_inc(&tl->pin_count)) {
+		i915_active_release(&tl->active);
+		__i915_vma_unpin(tl->hwsp_ggtt);
+	}
+
+	return 0;
+}
+
+void intel_timeline_reset_seqno(const struct intel_timeline *tl)
+{
+	u32 *hwsp_seqno = (u32 *)tl->hwsp_seqno;
+	/* Must be pinned to be writable, and no requests in flight. */
+	GEM_BUG_ON(!atomic_read(&tl->pin_count));
+
+	memset(hwsp_seqno + 1, 0, TIMELINE_SEQNO_BYTES - sizeof(*hwsp_seqno));
+	WRITE_ONCE(*hwsp_seqno, tl->seqno);
+	drm_clflush_virt_range(hwsp_seqno, TIMELINE_SEQNO_BYTES);
+}
+
+void intel_timeline_enter(struct intel_timeline *tl)
+{
+	struct intel_gt_timelines *timelines = &tl->gt->timelines;
+
+	/*
+	 * Pretend we are serialised by the timeline->mutex.
+	 *
+	 * While generally true, there are a few exceptions to the rule
+	 * for the engine->kernel_context being used to manage power
+	 * transitions. As the engine_park may be called from under any
+	 * timeline, it uses the power mutex as a global serialisation
+	 * lock to prevent any other request entering its timeline.
+	 *
+	 * The rule is generally tl->mutex, otherwise engine->wakeref.mutex.
+	 *
+	 * However, intel_gt_retire_request() does not know which engine
+	 * it is retiring along and so cannot partake in the engine-pm
+	 * barrier, and there we use the tl->active_count as a means to
+	 * pin the timeline in the active_list while the locks are dropped.
+	 * Ergo, as that is outside of the engine-pm barrier, we need to
+	 * use atomic to manipulate tl->active_count.
+	 */
+	lockdep_assert_held(&tl->mutex);
+
+	if (atomic_add_unless(&tl->active_count, 1, 0))
+		return;
+
+	spin_lock(&timelines->lock);
+	if (!atomic_fetch_inc(&tl->active_count)) {
+		/*
+		 * The HWSP is volatile, and may have been lost while inactive,
+		 * e.g. across suspend/resume. Be paranoid, and ensure that
+		 * the HWSP value matches our seqno so we don't proclaim
+		 * the next request as already complete.
+		 */
+		intel_timeline_reset_seqno(tl);
+		list_add_tail(&tl->link, &timelines->active_list);
+	}
+	spin_unlock(&timelines->lock);
+}
+
+void intel_timeline_exit(struct intel_timeline *tl)
+{
+	struct intel_gt_timelines *timelines = &tl->gt->timelines;
+
+	/* See intel_timeline_enter() */
+	lockdep_assert_held(&tl->mutex);
+
+	GEM_BUG_ON(!atomic_read(&tl->active_count));
+	if (atomic_add_unless(&tl->active_count, -1, 1))
+		return;
+
+	spin_lock(&timelines->lock);
+	if (atomic_dec_and_test(&tl->active_count))
+		list_del(&tl->link);
+	spin_unlock(&timelines->lock);
+
+	/*
+	 * Since this timeline is idle, all bariers upon which we were waiting
+	 * must also be complete and so we can discard the last used barriers
+	 * without loss of information.
+	 */
+	i915_syncmap_free(&tl->sync);
+}
+
+static u32 timeline_advance(struct intel_timeline *tl)
+{
+	GEM_BUG_ON(!atomic_read(&tl->pin_count));
+	GEM_BUG_ON(tl->seqno & tl->has_initial_breadcrumb);
+
+	return tl->seqno += 1 + tl->has_initial_breadcrumb;
+}
+
+static noinline int
+__intel_timeline_get_seqno(struct intel_timeline *tl,
+			   u32 *seqno)
+{
+	u32 next_ofs = offset_in_page(tl->hwsp_offset + TIMELINE_SEQNO_BYTES);
+
+	/* w/a: bit 5 needs to be zero for MI_FLUSH_DW address. */
+	if (TIMELINE_SEQNO_BYTES <= BIT(5) && (next_ofs & BIT(5)))
+		next_ofs = offset_in_page(next_ofs + BIT(5));
+
+	tl->hwsp_offset = i915_ggtt_offset(tl->hwsp_ggtt) + next_ofs;
+	tl->hwsp_seqno = tl->hwsp_map + next_ofs;
+	intel_timeline_reset_seqno(tl);
+
+	*seqno = timeline_advance(tl);
+	GEM_BUG_ON(i915_seqno_passed(*tl->hwsp_seqno, *seqno));
+	return 0;
+}
+
+int intel_timeline_get_seqno(struct intel_timeline *tl,
+			     struct i915_request *rq,
+			     u32 *seqno)
+{
+	*seqno = timeline_advance(tl);
+
+	/* Replace the HWSP on wraparound for HW semaphores */
+	if (unlikely(!*seqno && tl->has_initial_breadcrumb))
+		return __intel_timeline_get_seqno(tl, seqno);
+
+	return 0;
+}
+
+int intel_timeline_read_hwsp(struct i915_request *from,
+			     struct i915_request *to,
+			     u32 *hwsp)
+{
+	struct intel_timeline *tl;
+	int err;
+
+	rcu_read_lock();
+	tl = rcu_dereference(from->timeline);
+	if (i915_request_signaled(from) ||
+	    !i915_active_acquire_if_busy(&tl->active))
+		tl = NULL;
+
+	if (tl) {
+		/* hwsp_offset may wraparound, so use from->hwsp_seqno */
+		*hwsp = i915_ggtt_offset(tl->hwsp_ggtt) +
+			offset_in_page(from->hwsp_seqno);
+	}
+
+	/* ensure we wait on the right request, if not, we completed */
+	if (tl && __i915_request_is_complete(from)) {
+		i915_active_release(&tl->active);
+		tl = NULL;
+	}
+	rcu_read_unlock();
+
+	if (!tl)
+		return 1;
+
+	/* Can't do semaphore waits on kernel context */
+	if (!tl->has_initial_breadcrumb) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	err = i915_active_add_request(&tl->active, to);
+
+out:
+	i915_active_release(&tl->active);
+	return err;
+}
+
+void intel_timeline_unpin(struct intel_timeline *tl)
+{
+	GEM_BUG_ON(!atomic_read(&tl->pin_count));
+	if (!atomic_dec_and_test(&tl->pin_count))
+		return;
+
+	i915_active_release(&tl->active);
+	__i915_vma_unpin(tl->hwsp_ggtt);
+}
+
+void __intel_timeline_free(struct kref *kref)
+{
+	struct intel_timeline *timeline =
+		container_of(kref, typeof(*timeline), kref);
+
+	GEM_BUG_ON(atomic_read(&timeline->pin_count));
+	GEM_BUG_ON(!list_empty(&timeline->requests));
+	GEM_BUG_ON(timeline->retire);
+
+	call_rcu(&timeline->rcu, intel_timeline_fini);
+}
+
+void intel_gt_fini_timelines(struct intel_gt *gt)
+{
+	struct intel_gt_timelines *timelines = &gt->timelines;
+
+	GEM_BUG_ON(!list_empty(&timelines->active_list));
+}
+
+void intel_gt_show_timelines(struct intel_gt *gt,
+			     struct drm_printer *m,
+			     void (*show_request)(struct drm_printer *m,
+						  const struct i915_request *rq,
+						  const char *prefix,
+						  int indent))
+{
+	struct intel_gt_timelines *timelines = &gt->timelines;
+	struct intel_timeline *tl, *tn;
+	LIST_HEAD(free);
+
+	spin_lock(&timelines->lock);
+	list_for_each_entry_safe(tl, tn, &timelines->active_list, link) {
+		unsigned long count, ready, inflight;
+		struct i915_request *rq, *rn;
+		struct dma_fence *fence;
+
+		if (!mutex_trylock(&tl->mutex)) {
+			drm_printf(m, "Timeline %llx: busy; skipping\n",
+				   tl->fence_context);
+			continue;
+		}
+
+		intel_timeline_get(tl);
+		GEM_BUG_ON(!atomic_read(&tl->active_count));
+		atomic_inc(&tl->active_count); /* pin the list element */
+		spin_unlock(&timelines->lock);
+
+		count = 0;
+		ready = 0;
+		inflight = 0;
+		list_for_each_entry_safe(rq, rn, &tl->requests, link) {
+			if (i915_request_completed(rq))
+				continue;
+
+			count++;
+			if (i915_request_is_ready(rq))
+				ready++;
+			if (i915_request_is_active(rq))
+				inflight++;
+		}
+
+		drm_printf(m, "Timeline %llx: { ", tl->fence_context);
+		drm_printf(m, "count: %lu, ready: %lu, inflight: %lu",
+			   count, ready, inflight);
+		drm_printf(m, ", seqno: { current: %d, last: %d }",
+			   *tl->hwsp_seqno, tl->seqno);
+		fence = i915_active_fence_get(&tl->last_request);
+		if (fence) {
+			drm_printf(m, ", engine: %s",
+				   to_request(fence)->engine->name);
+			dma_fence_put(fence);
+		}
+		drm_printf(m, " }\n");
+
+		if (show_request) {
+			list_for_each_entry_safe(rq, rn, &tl->requests, link)
+				show_request(m, rq, "", 2);
+		}
+
+		mutex_unlock(&tl->mutex);
+		spin_lock(&timelines->lock);
+
+		/* Resume list iteration after reacquiring spinlock */
+		list_safe_reset_next(tl, tn, link);
+		if (atomic_dec_and_test(&tl->active_count))
+			list_del(&tl->link);
+
+		/* Defer the final release to after the spinlock */
+		if (refcount_dec_and_test(&tl->kref.refcount)) {
+			GEM_BUG_ON(atomic_read(&tl->active_count));
+			list_add(&tl->link, &free);
+		}
+	}
+	spin_unlock(&timelines->lock);
+
+	list_for_each_entry_safe(tl, tn, &free, link)
+		__intel_timeline_free(&tl->kref);
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "gt/selftests/mock_timeline.c"
+#include "gt/selftest_timeline.c"
+#endif