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, 480 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.c
new file mode 100644
index 000000000..b7c9d6115
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.c
@@ -0,0 +1,480 @@
+/*
+ * Copyright 2012 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+#include "chan.h"
+#include "chid.h"
+#include "cgrp.h"
+#include "chid.h"
+#include "runl.h"
+#include "priv.h"
+
+#include <core/ramht.h>
+#include <subdev/mmu.h>
+#include <engine/dma.h>
+
+#include <nvif/if0020.h>
+
+const struct nvkm_event_func
+nvkm_chan_event = {
+};
+
+void
+nvkm_chan_cctx_bind(struct nvkm_chan *chan, struct nvkm_engn *engn, struct nvkm_cctx *cctx)
+{
+	struct nvkm_cgrp *cgrp = chan->cgrp;
+	struct nvkm_runl *runl = cgrp->runl;
+	struct nvkm_engine *engine = engn->engine;
+
+	if (!engn->func->bind)
+		return;
+
+	CHAN_TRACE(chan, "%sbind cctx %d[%s]", cctx ? "" : "un", engn->id, engine->subdev.name);
+
+	/* Prevent any channel in channel group from being rescheduled, kick them
+	 * off host and any engine(s) they're loaded on.
+	 */
+	if (cgrp->hw)
+		nvkm_runl_block(runl);
+	else
+		nvkm_chan_block(chan);
+	nvkm_chan_preempt(chan, true);
+
+	/* Update context pointer. */
+	engn->func->bind(engn, cctx, chan);
+
+	/* Resume normal operation. */
+	if (cgrp->hw)
+		nvkm_runl_allow(runl);
+	else
+		nvkm_chan_allow(chan);
+}
+
+void
+nvkm_chan_cctx_put(struct nvkm_chan *chan, struct nvkm_cctx **pcctx)
+{
+	struct nvkm_cctx *cctx = *pcctx;
+
+	if (cctx) {
+		struct nvkm_engn *engn = cctx->vctx->ectx->engn;
+
+		if (refcount_dec_and_mutex_lock(&cctx->refs, &chan->cgrp->mutex)) {
+			CHAN_TRACE(chan, "dtor cctx %d[%s]", engn->id, engn->engine->subdev.name);
+			nvkm_cgrp_vctx_put(chan->cgrp, &cctx->vctx);
+			list_del(&cctx->head);
+			kfree(cctx);
+			mutex_unlock(&chan->cgrp->mutex);
+		}
+
+		*pcctx = NULL;
+	}
+}
+
+int
+nvkm_chan_cctx_get(struct nvkm_chan *chan, struct nvkm_engn *engn, struct nvkm_cctx **pcctx,
+		   struct nvkm_client *client)
+{
+	struct nvkm_cgrp *cgrp = chan->cgrp;
+	struct nvkm_vctx *vctx;
+	struct nvkm_cctx *cctx;
+	int ret;
+
+	/* Look for an existing channel context for this engine+VEID. */
+	mutex_lock(&cgrp->mutex);
+	cctx = nvkm_list_find(cctx, &chan->cctxs, head,
+			      cctx->vctx->ectx->engn == engn && cctx->vctx->vmm == chan->vmm);
+	if (cctx) {
+		refcount_inc(&cctx->refs);
+		*pcctx = cctx;
+		mutex_unlock(&chan->cgrp->mutex);
+		return 0;
+	}
+
+	/* Nope - create a fresh one.  But, sub-context first. */
+	ret = nvkm_cgrp_vctx_get(cgrp, engn, chan, &vctx, client);
+	if (ret) {
+		CHAN_ERROR(chan, "vctx %d[%s]: %d", engn->id, engn->engine->subdev.name, ret);
+		goto done;
+	}
+
+	/* Now, create the channel context - to track engine binding. */
+	CHAN_TRACE(chan, "ctor cctx %d[%s]", engn->id, engn->engine->subdev.name);
+	if (!(cctx = *pcctx = kzalloc(sizeof(*cctx), GFP_KERNEL))) {
+		nvkm_cgrp_vctx_put(cgrp, &vctx);
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	cctx->vctx = vctx;
+	refcount_set(&cctx->refs, 1);
+	refcount_set(&cctx->uses, 0);
+	list_add_tail(&cctx->head, &chan->cctxs);
+done:
+	mutex_unlock(&cgrp->mutex);
+	return ret;
+}
+
+int
+nvkm_chan_preempt_locked(struct nvkm_chan *chan, bool wait)
+{
+	struct nvkm_runl *runl = chan->cgrp->runl;
+
+	CHAN_TRACE(chan, "preempt");
+	chan->func->preempt(chan);
+	if (!wait)
+		return 0;
+
+	return nvkm_runl_preempt_wait(runl);
+}
+
+int
+nvkm_chan_preempt(struct nvkm_chan *chan, bool wait)
+{
+	int ret;
+
+	if (!chan->func->preempt)
+		return 0;
+
+	mutex_lock(&chan->cgrp->runl->mutex);
+	ret = nvkm_chan_preempt_locked(chan, wait);
+	mutex_unlock(&chan->cgrp->runl->mutex);
+	return ret;
+}
+
+void
+nvkm_chan_remove_locked(struct nvkm_chan *chan)
+{
+	struct nvkm_cgrp *cgrp = chan->cgrp;
+	struct nvkm_runl *runl = cgrp->runl;
+
+	if (list_empty(&chan->head))
+		return;
+
+	CHAN_TRACE(chan, "remove");
+	if (!--cgrp->chan_nr) {
+		runl->cgrp_nr--;
+		list_del(&cgrp->head);
+	}
+	runl->chan_nr--;
+	list_del_init(&chan->head);
+	atomic_set(&runl->changed, 1);
+}
+
+void
+nvkm_chan_remove(struct nvkm_chan *chan, bool preempt)
+{
+	struct nvkm_runl *runl = chan->cgrp->runl;
+
+	mutex_lock(&runl->mutex);
+	if (preempt && chan->func->preempt)
+		nvkm_chan_preempt_locked(chan, true);
+	nvkm_chan_remove_locked(chan);
+	nvkm_runl_update_locked(runl, true);
+	mutex_unlock(&runl->mutex);
+}
+
+void
+nvkm_chan_insert(struct nvkm_chan *chan)
+{
+	struct nvkm_cgrp *cgrp = chan->cgrp;
+	struct nvkm_runl *runl = cgrp->runl;
+
+	mutex_lock(&runl->mutex);
+	if (WARN_ON(!list_empty(&chan->head))) {
+		mutex_unlock(&runl->mutex);
+		return;
+	}
+
+	CHAN_TRACE(chan, "insert");
+	list_add_tail(&chan->head, &cgrp->chans);
+	runl->chan_nr++;
+	if (!cgrp->chan_nr++) {
+		list_add_tail(&cgrp->head, &cgrp->runl->cgrps);
+		runl->cgrp_nr++;
+	}
+	atomic_set(&runl->changed, 1);
+	nvkm_runl_update_locked(runl, true);
+	mutex_unlock(&runl->mutex);
+}
+
+static void
+nvkm_chan_block_locked(struct nvkm_chan *chan)
+{
+	CHAN_TRACE(chan, "block %d", atomic_read(&chan->blocked));
+	if (atomic_inc_return(&chan->blocked) == 1)
+		chan->func->stop(chan);
+}
+
+void
+nvkm_chan_error(struct nvkm_chan *chan, bool preempt)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chan->lock, flags);
+	if (atomic_inc_return(&chan->errored) == 1) {
+		CHAN_ERROR(chan, "errored - disabling channel");
+		nvkm_chan_block_locked(chan);
+		if (preempt)
+			chan->func->preempt(chan);
+		nvkm_event_ntfy(&chan->cgrp->runl->chid->event, chan->id, NVKM_CHAN_EVENT_ERRORED);
+	}
+	spin_unlock_irqrestore(&chan->lock, flags);
+}
+
+void
+nvkm_chan_block(struct nvkm_chan *chan)
+{
+	spin_lock_irq(&chan->lock);
+	nvkm_chan_block_locked(chan);
+	spin_unlock_irq(&chan->lock);
+}
+
+void
+nvkm_chan_allow(struct nvkm_chan *chan)
+{
+	spin_lock_irq(&chan->lock);
+	CHAN_TRACE(chan, "allow %d", atomic_read(&chan->blocked));
+	if (atomic_dec_and_test(&chan->blocked))
+		chan->func->start(chan);
+	spin_unlock_irq(&chan->lock);
+}
+
+void
+nvkm_chan_del(struct nvkm_chan **pchan)
+{
+	struct nvkm_chan *chan = *pchan;
+
+	if (!chan)
+		return;
+
+	if (chan->func->ramfc->clear)
+		chan->func->ramfc->clear(chan);
+
+	nvkm_ramht_del(&chan->ramht);
+	nvkm_gpuobj_del(&chan->pgd);
+	nvkm_gpuobj_del(&chan->eng);
+	nvkm_gpuobj_del(&chan->cache);
+	nvkm_gpuobj_del(&chan->ramfc);
+
+	nvkm_memory_unref(&chan->userd.mem);
+
+	if (chan->cgrp) {
+		nvkm_chid_put(chan->cgrp->runl->chid, chan->id, &chan->cgrp->lock);
+		nvkm_cgrp_unref(&chan->cgrp);
+	}
+
+	if (chan->vmm) {
+		nvkm_vmm_part(chan->vmm, chan->inst->memory);
+		nvkm_vmm_unref(&chan->vmm);
+	}
+
+	nvkm_gpuobj_del(&chan->push);
+	nvkm_gpuobj_del(&chan->inst);
+	kfree(chan);
+}
+
+void
+nvkm_chan_put(struct nvkm_chan **pchan, unsigned long irqflags)
+{
+	struct nvkm_chan *chan = *pchan;
+
+	if (!chan)
+		return;
+
+	*pchan = NULL;
+	spin_unlock_irqrestore(&chan->cgrp->lock, irqflags);
+}
+
+struct nvkm_chan *
+nvkm_chan_get_inst(struct nvkm_engine *engine, u64 inst, unsigned long *pirqflags)
+{
+	struct nvkm_fifo *fifo = engine->subdev.device->fifo;
+	struct nvkm_runl *runl;
+	struct nvkm_engn *engn;
+	struct nvkm_chan *chan;
+
+	nvkm_runl_foreach(runl, fifo) {
+		nvkm_runl_foreach_engn(engn, runl) {
+			if (engine == &fifo->engine || engn->engine == engine) {
+				chan = nvkm_runl_chan_get_inst(runl, inst, pirqflags);
+				if (chan || engn->engine == engine)
+					return chan;
+			}
+		}
+	}
+
+	return NULL;
+}
+
+struct nvkm_chan *
+nvkm_chan_get_chid(struct nvkm_engine *engine, int id, unsigned long *pirqflags)
+{
+	struct nvkm_fifo *fifo = engine->subdev.device->fifo;
+	struct nvkm_runl *runl;
+	struct nvkm_engn *engn;
+
+	nvkm_runl_foreach(runl, fifo) {
+		nvkm_runl_foreach_engn(engn, runl) {
+			if (fifo->chid || engn->engine == engine)
+				return nvkm_runl_chan_get_chid(runl, id, pirqflags);
+		}
+	}
+
+	return NULL;
+}
+
+int
+nvkm_chan_new_(const struct nvkm_chan_func *func, struct nvkm_runl *runl, int runq,
+	       struct nvkm_cgrp *cgrp, const char *name, bool priv, u32 devm, struct nvkm_vmm *vmm,
+	       struct nvkm_dmaobj *dmaobj, u64 offset, u64 length,
+	       struct nvkm_memory *userd, u64 ouserd, struct nvkm_chan **pchan)
+{
+	struct nvkm_fifo *fifo = runl->fifo;
+	struct nvkm_device *device = fifo->engine.subdev.device;
+	struct nvkm_chan *chan;
+	int ret;
+
+	/* Validate arguments against class requirements. */
+	if ((runq && runq >= runl->func->runqs) ||
+	    (!func->inst->vmm != !vmm) ||
+	    ((func->userd->bar < 0) == !userd) ||
+	    (!func->ramfc->ctxdma != !dmaobj) ||
+	    ((func->ramfc->devm < devm) && devm != BIT(0)) ||
+	    (!func->ramfc->priv && priv)) {
+		RUNL_DEBUG(runl, "args runq:%d:%d vmm:%d:%p userd:%d:%p "
+				 "push:%d:%p devm:%08x:%08x priv:%d:%d",
+			   runl->func->runqs, runq, func->inst->vmm, vmm,
+			   func->userd->bar < 0, userd, func->ramfc->ctxdma, dmaobj,
+			   func->ramfc->devm, devm, func->ramfc->priv, priv);
+		return -EINVAL;
+	}
+
+	if (!(chan = *pchan = kzalloc(sizeof(*chan), GFP_KERNEL)))
+		return -ENOMEM;
+
+	chan->func = func;
+	strscpy(chan->name, name, sizeof(chan->name));
+	chan->runq = runq;
+	chan->id = -1;
+	spin_lock_init(&chan->lock);
+	atomic_set(&chan->blocked, 1);
+	atomic_set(&chan->errored, 0);
+	INIT_LIST_HEAD(&chan->cctxs);
+	INIT_LIST_HEAD(&chan->head);
+
+	/* Join channel group.
+	 *
+	 * GK110 and newer support channel groups (aka TSGs), where individual channels
+	 * share a timeslice, and, engine context(s).
+	 *
+	 * As such, engine contexts are tracked in nvkm_cgrp and we need them even when
+	 * channels aren't in an API channel group, and on HW that doesn't support TSGs.
+	 */
+	if (!cgrp) {
+		ret = nvkm_cgrp_new(runl, chan->name, vmm, fifo->func->cgrp.force, &chan->cgrp);
+		if (ret) {
+			RUNL_DEBUG(runl, "cgrp %d", ret);
+			return ret;
+		}
+
+		cgrp = chan->cgrp;
+	} else {
+		if (cgrp->runl != runl || cgrp->vmm != vmm) {
+			RUNL_DEBUG(runl, "cgrp %d %d", cgrp->runl != runl, cgrp->vmm != vmm);
+			return -EINVAL;
+		}
+
+		chan->cgrp = nvkm_cgrp_ref(cgrp);
+	}
+
+	/* Allocate instance block. */
+	ret = nvkm_gpuobj_new(device, func->inst->size, 0x1000, func->inst->zero, NULL,
+			      &chan->inst);
+	if (ret) {
+		RUNL_DEBUG(runl, "inst %d", ret);
+		return ret;
+	}
+
+	/* Initialise virtual address-space. */
+	if (func->inst->vmm) {
+		if (WARN_ON(vmm->mmu != device->mmu))
+			return -EINVAL;
+
+		ret = nvkm_vmm_join(vmm, chan->inst->memory);
+		if (ret) {
+			RUNL_DEBUG(runl, "vmm %d", ret);
+			return ret;
+		}
+
+		chan->vmm = nvkm_vmm_ref(vmm);
+	}
+
+	/* Allocate HW ctxdma for push buffer. */
+	if (func->ramfc->ctxdma) {
+		ret = nvkm_object_bind(&dmaobj->object, chan->inst, -16, &chan->push);
+		if (ret) {
+			RUNL_DEBUG(runl, "bind %d", ret);
+			return ret;
+		}
+	}
+
+	/* Allocate channel ID. */
+	chan->id = nvkm_chid_get(runl->chid, chan);
+	if (chan->id < 0) {
+		RUNL_ERROR(runl, "!chids");
+		return -ENOSPC;
+	}
+
+	if (cgrp->id < 0)
+		cgrp->id = chan->id;
+
+	/* Initialise USERD. */
+	if (func->userd->bar < 0) {
+		if (ouserd + chan->func->userd->size >= nvkm_memory_size(userd)) {
+			RUNL_DEBUG(runl, "ouserd %llx", ouserd);
+			return -EINVAL;
+		}
+
+		ret = nvkm_memory_kmap(userd, &chan->userd.mem);
+		if (ret) {
+			RUNL_DEBUG(runl, "userd %d", ret);
+			return ret;
+		}
+
+		chan->userd.base = ouserd;
+	} else {
+		chan->userd.mem = nvkm_memory_ref(fifo->userd.mem);
+		chan->userd.base = chan->id * chan->func->userd->size;
+	}
+
+	if (chan->func->userd->clear)
+		chan->func->userd->clear(chan);
+
+	/* Initialise RAMFC. */
+	ret = chan->func->ramfc->write(chan, offset, length, devm, priv);
+	if (ret) {
+		RUNL_DEBUG(runl, "ramfc %d", ret);
+		return ret;
+	}
+
+	return 0;
+}