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, 410 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/base.c
new file mode 100644
index 000000000..976539de4
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/base.c
@@ -0,0 +1,410 @@
+/*
+ * Copyright 2013 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 "priv.h"
+#include "aux.h"
+#include "bus.h"
+#include "pad.h"
+
+#include <core/option.h>
+#include <subdev/bios.h>
+#include <subdev/bios/dcb.h>
+#include <subdev/bios/i2c.h>
+
+static struct nvkm_i2c_pad *
+nvkm_i2c_pad_find(struct nvkm_i2c *i2c, int id)
+{
+	struct nvkm_i2c_pad *pad;
+
+	list_for_each_entry(pad, &i2c->pad, head) {
+		if (pad->id == id)
+			return pad;
+	}
+
+	return NULL;
+}
+
+struct nvkm_i2c_bus *
+nvkm_i2c_bus_find(struct nvkm_i2c *i2c, int id)
+{
+	struct nvkm_bios *bios = i2c->subdev.device->bios;
+	struct nvkm_i2c_bus *bus;
+
+	if (id == NVKM_I2C_BUS_PRI || id == NVKM_I2C_BUS_SEC) {
+		u8  ver, hdr, cnt, len;
+		u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len);
+		if (i2c && ver >= 0x30) {
+			u8 auxidx = nvbios_rd08(bios, i2c + 4);
+			if (id == NVKM_I2C_BUS_PRI)
+				id = NVKM_I2C_BUS_CCB((auxidx & 0x0f) >> 0);
+			else
+				id = NVKM_I2C_BUS_CCB((auxidx & 0xf0) >> 4);
+		} else {
+			id = NVKM_I2C_BUS_CCB(2);
+		}
+	}
+
+	list_for_each_entry(bus, &i2c->bus, head) {
+		if (bus->id == id)
+			return bus;
+	}
+
+	return NULL;
+}
+
+struct nvkm_i2c_aux *
+nvkm_i2c_aux_find(struct nvkm_i2c *i2c, int id)
+{
+	struct nvkm_i2c_aux *aux;
+
+	list_for_each_entry(aux, &i2c->aux, head) {
+		if (aux->id == id)
+			return aux;
+	}
+
+	return NULL;
+}
+
+static void
+nvkm_i2c_intr_fini(struct nvkm_event *event, int type, int id)
+{
+	struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
+	struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, id);
+	if (aux)
+		i2c->func->aux_mask(i2c, type, aux->intr, 0);
+}
+
+static void
+nvkm_i2c_intr_init(struct nvkm_event *event, int type, int id)
+{
+	struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
+	struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, id);
+	if (aux)
+		i2c->func->aux_mask(i2c, type, aux->intr, aux->intr);
+}
+
+static const struct nvkm_event_func
+nvkm_i2c_intr_func = {
+	.init = nvkm_i2c_intr_init,
+	.fini = nvkm_i2c_intr_fini,
+};
+
+static void
+nvkm_i2c_intr(struct nvkm_subdev *subdev)
+{
+	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
+	struct nvkm_i2c_aux *aux;
+	u32 hi, lo, rq, tx;
+
+	if (!i2c->func->aux_stat)
+		return;
+
+	i2c->func->aux_stat(i2c, &hi, &lo, &rq, &tx);
+	if (!hi && !lo && !rq && !tx)
+		return;
+
+	list_for_each_entry(aux, &i2c->aux, head) {
+		u32 mask = 0;
+		if (hi & aux->intr) mask |= NVKM_I2C_PLUG;
+		if (lo & aux->intr) mask |= NVKM_I2C_UNPLUG;
+		if (rq & aux->intr) mask |= NVKM_I2C_IRQ;
+		if (tx & aux->intr) mask |= NVKM_I2C_DONE;
+		if (mask)
+			nvkm_event_ntfy(&i2c->event, aux->id, mask);
+	}
+}
+
+static int
+nvkm_i2c_fini(struct nvkm_subdev *subdev, bool suspend)
+{
+	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
+	struct nvkm_i2c_pad *pad;
+	struct nvkm_i2c_bus *bus;
+	struct nvkm_i2c_aux *aux;
+	u32 mask;
+
+	list_for_each_entry(aux, &i2c->aux, head) {
+		nvkm_i2c_aux_fini(aux);
+	}
+
+	list_for_each_entry(bus, &i2c->bus, head) {
+		nvkm_i2c_bus_fini(bus);
+	}
+
+	if ((mask = (1 << i2c->func->aux) - 1), i2c->func->aux_stat) {
+		i2c->func->aux_mask(i2c, NVKM_I2C_ANY, mask, 0);
+		i2c->func->aux_stat(i2c, &mask, &mask, &mask, &mask);
+	}
+
+	list_for_each_entry(pad, &i2c->pad, head) {
+		nvkm_i2c_pad_fini(pad);
+	}
+
+	return 0;
+}
+
+static int
+nvkm_i2c_preinit(struct nvkm_subdev *subdev)
+{
+	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
+	struct nvkm_i2c_bus *bus;
+	struct nvkm_i2c_pad *pad;
+
+	/*
+	 * We init our i2c busses as early as possible, since they may be
+	 * needed by the vbios init scripts on some cards
+	 */
+	list_for_each_entry(pad, &i2c->pad, head)
+		nvkm_i2c_pad_init(pad);
+	list_for_each_entry(bus, &i2c->bus, head)
+		nvkm_i2c_bus_init(bus);
+
+	return 0;
+}
+
+static int
+nvkm_i2c_init(struct nvkm_subdev *subdev)
+{
+	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
+	struct nvkm_i2c_bus *bus;
+	struct nvkm_i2c_pad *pad;
+	struct nvkm_i2c_aux *aux;
+
+	list_for_each_entry(pad, &i2c->pad, head) {
+		nvkm_i2c_pad_init(pad);
+	}
+
+	list_for_each_entry(bus, &i2c->bus, head) {
+		nvkm_i2c_bus_init(bus);
+	}
+
+	list_for_each_entry(aux, &i2c->aux, head) {
+		nvkm_i2c_aux_init(aux);
+	}
+
+	return 0;
+}
+
+static void *
+nvkm_i2c_dtor(struct nvkm_subdev *subdev)
+{
+	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
+
+	nvkm_event_fini(&i2c->event);
+
+	while (!list_empty(&i2c->aux)) {
+		struct nvkm_i2c_aux *aux =
+			list_first_entry(&i2c->aux, typeof(*aux), head);
+		nvkm_i2c_aux_del(&aux);
+	}
+
+	while (!list_empty(&i2c->bus)) {
+		struct nvkm_i2c_bus *bus =
+			list_first_entry(&i2c->bus, typeof(*bus), head);
+		nvkm_i2c_bus_del(&bus);
+	}
+
+	while (!list_empty(&i2c->pad)) {
+		struct nvkm_i2c_pad *pad =
+			list_first_entry(&i2c->pad, typeof(*pad), head);
+		nvkm_i2c_pad_del(&pad);
+	}
+
+	return i2c;
+}
+
+static const struct nvkm_subdev_func
+nvkm_i2c = {
+	.dtor = nvkm_i2c_dtor,
+	.preinit = nvkm_i2c_preinit,
+	.init = nvkm_i2c_init,
+	.fini = nvkm_i2c_fini,
+	.intr = nvkm_i2c_intr,
+};
+
+static const struct nvkm_i2c_drv {
+	u8 bios;
+	u8 addr;
+	int (*pad_new)(struct nvkm_i2c_bus *, int id, u8 addr,
+		       struct nvkm_i2c_pad **);
+}
+nvkm_i2c_drv[] = {
+	{ 0x0d, 0x39, anx9805_pad_new },
+	{ 0x0e, 0x3b, anx9805_pad_new },
+	{}
+};
+
+int
+nvkm_i2c_new_(const struct nvkm_i2c_func *func, struct nvkm_device *device,
+	      enum nvkm_subdev_type type, int inst, struct nvkm_i2c **pi2c)
+{
+	struct nvkm_bios *bios = device->bios;
+	struct nvkm_i2c *i2c;
+	struct dcb_i2c_entry ccbE;
+	struct dcb_output dcbE;
+	u8 ver, hdr;
+	int ret, i;
+
+	if (!(i2c = *pi2c = kzalloc(sizeof(*i2c), GFP_KERNEL)))
+		return -ENOMEM;
+
+	nvkm_subdev_ctor(&nvkm_i2c, device, type, inst, &i2c->subdev);
+	i2c->func = func;
+	INIT_LIST_HEAD(&i2c->pad);
+	INIT_LIST_HEAD(&i2c->bus);
+	INIT_LIST_HEAD(&i2c->aux);
+
+	i = -1;
+	while (!dcb_i2c_parse(bios, ++i, &ccbE)) {
+		struct nvkm_i2c_pad *pad = NULL;
+		struct nvkm_i2c_bus *bus = NULL;
+		struct nvkm_i2c_aux *aux = NULL;
+
+		nvkm_debug(&i2c->subdev, "ccb %02x: type %02x drive %02x "
+			   "sense %02x share %02x auxch %02x\n", i, ccbE.type,
+			   ccbE.drive, ccbE.sense, ccbE.share, ccbE.auxch);
+
+		if (ccbE.share != DCB_I2C_UNUSED) {
+			const int id = NVKM_I2C_PAD_HYBRID(ccbE.share);
+			if (!(pad = nvkm_i2c_pad_find(i2c, id)))
+				ret = func->pad_s_new(i2c, id, &pad);
+			else
+				ret = 0;
+		} else {
+			ret = func->pad_x_new(i2c, NVKM_I2C_PAD_CCB(i), &pad);
+		}
+
+		if (ret) {
+			nvkm_error(&i2c->subdev, "ccb %02x pad, %d\n", i, ret);
+			nvkm_i2c_pad_del(&pad);
+			continue;
+		}
+
+		if (pad->func->bus_new_0 && ccbE.type == DCB_I2C_NV04_BIT) {
+			ret = pad->func->bus_new_0(pad, NVKM_I2C_BUS_CCB(i),
+						   ccbE.drive,
+						   ccbE.sense, &bus);
+		} else
+		if (pad->func->bus_new_4 &&
+		    ( ccbE.type == DCB_I2C_NV4E_BIT ||
+		      ccbE.type == DCB_I2C_NVIO_BIT ||
+		     (ccbE.type == DCB_I2C_PMGR &&
+		      ccbE.drive != DCB_I2C_UNUSED))) {
+			ret = pad->func->bus_new_4(pad, NVKM_I2C_BUS_CCB(i),
+						   ccbE.drive, &bus);
+		}
+
+		if (ret) {
+			nvkm_error(&i2c->subdev, "ccb %02x bus, %d\n", i, ret);
+			nvkm_i2c_bus_del(&bus);
+		}
+
+		if (pad->func->aux_new_6 &&
+		    ( ccbE.type == DCB_I2C_NVIO_AUX ||
+		     (ccbE.type == DCB_I2C_PMGR &&
+		      ccbE.auxch != DCB_I2C_UNUSED))) {
+			ret = pad->func->aux_new_6(pad, NVKM_I2C_BUS_CCB(i),
+						   ccbE.auxch, &aux);
+		} else {
+			ret = 0;
+		}
+
+		if (ret) {
+			nvkm_error(&i2c->subdev, "ccb %02x aux, %d\n", i, ret);
+			nvkm_i2c_aux_del(&aux);
+		}
+
+		if (ccbE.type != DCB_I2C_UNUSED && !bus && !aux) {
+			nvkm_warn(&i2c->subdev, "ccb %02x was ignored\n", i);
+			continue;
+		}
+	}
+
+	i = -1;
+	while (dcb_outp_parse(bios, ++i, &ver, &hdr, &dcbE)) {
+		const struct nvkm_i2c_drv *drv = nvkm_i2c_drv;
+		struct nvkm_i2c_bus *bus;
+		struct nvkm_i2c_pad *pad;
+
+		/* internal outputs handled by native i2c busses (above) */
+		if (!dcbE.location)
+			continue;
+
+		/* we need an i2c bus to talk to the external encoder */
+		bus = nvkm_i2c_bus_find(i2c, dcbE.i2c_index);
+		if (!bus) {
+			nvkm_debug(&i2c->subdev, "dcb %02x no bus\n", i);
+			continue;
+		}
+
+		/* ... and a driver for it */
+		while (drv->pad_new) {
+			if (drv->bios == dcbE.extdev)
+				break;
+			drv++;
+		}
+
+		if (!drv->pad_new) {
+			nvkm_debug(&i2c->subdev, "dcb %02x drv %02x unknown\n",
+				   i, dcbE.extdev);
+			continue;
+		}
+
+		/* find/create an instance of the driver */
+		pad = nvkm_i2c_pad_find(i2c, NVKM_I2C_PAD_EXT(dcbE.extdev));
+		if (!pad) {
+			const int id = NVKM_I2C_PAD_EXT(dcbE.extdev);
+			ret = drv->pad_new(bus, id, drv->addr, &pad);
+			if (ret) {
+				nvkm_error(&i2c->subdev, "dcb %02x pad, %d\n",
+					   i, ret);
+				nvkm_i2c_pad_del(&pad);
+				continue;
+			}
+		}
+
+		/* create any i2c bus / aux channel required by the output */
+		if (pad->func->aux_new_6 && dcbE.type == DCB_OUTPUT_DP) {
+			const int id = NVKM_I2C_AUX_EXT(dcbE.extdev);
+			struct nvkm_i2c_aux *aux = NULL;
+			ret = pad->func->aux_new_6(pad, id, 0, &aux);
+			if (ret) {
+				nvkm_error(&i2c->subdev, "dcb %02x aux, %d\n",
+					   i, ret);
+				nvkm_i2c_aux_del(&aux);
+			}
+		} else
+		if (pad->func->bus_new_4) {
+			const int id = NVKM_I2C_BUS_EXT(dcbE.extdev);
+			struct nvkm_i2c_bus *bus = NULL;
+			ret = pad->func->bus_new_4(pad, id, 0, &bus);
+			if (ret) {
+				nvkm_error(&i2c->subdev, "dcb %02x bus, %d\n",
+					   i, ret);
+				nvkm_i2c_bus_del(&bus);
+			}
+		}
+	}
+
+	return nvkm_event_init(&nvkm_i2c_intr_func, &i2c->subdev, 4, i, &i2c->event);
+}