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, 540 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
new file mode 100644
index 000000000..183130355
--- /dev/null
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -0,0 +1,540 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
+ *               extra sysfs attribute from DRM. Normal drm_sysfs_class
+ *               does not allow adding attributes.
+ *
+ * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
+ * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (c) 2003-2004 IBM Corp.
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/gfp.h>
+#include <linux/i2c.h>
+#include <linux/kdev_t.h>
+#include <linux/slab.h>
+
+#include <drm/drm_accel.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_device.h>
+#include <drm/drm_file.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_print.h>
+#include <drm/drm_property.h>
+#include <drm/drm_sysfs.h>
+
+#include "drm_internal.h"
+#include "drm_crtc_internal.h"
+
+#define to_drm_minor(d) dev_get_drvdata(d)
+#define to_drm_connector(d) dev_get_drvdata(d)
+
+/**
+ * DOC: overview
+ *
+ * DRM provides very little additional support to drivers for sysfs
+ * interactions, beyond just all the standard stuff. Drivers who want to expose
+ * additional sysfs properties and property groups can attach them at either
+ * &drm_device.dev or &drm_connector.kdev.
+ *
+ * Registration is automatically handled when calling drm_dev_register(), or
+ * drm_connector_register() in case of hot-plugged connectors. Unregistration is
+ * also automatically handled by drm_dev_unregister() and
+ * drm_connector_unregister().
+ */
+
+static struct device_type drm_sysfs_device_minor = {
+	.name = "drm_minor"
+};
+
+static struct device_type drm_sysfs_device_connector = {
+	.name = "drm_connector",
+};
+
+struct class *drm_class;
+
+#ifdef CONFIG_ACPI
+static bool drm_connector_acpi_bus_match(struct device *dev)
+{
+	return dev->type == &drm_sysfs_device_connector;
+}
+
+static struct acpi_device *drm_connector_acpi_find_companion(struct device *dev)
+{
+	struct drm_connector *connector = to_drm_connector(dev);
+
+	return to_acpi_device_node(connector->fwnode);
+}
+
+static struct acpi_bus_type drm_connector_acpi_bus = {
+	.name = "drm_connector",
+	.match = drm_connector_acpi_bus_match,
+	.find_companion = drm_connector_acpi_find_companion,
+};
+
+static void drm_sysfs_acpi_register(void)
+{
+	register_acpi_bus_type(&drm_connector_acpi_bus);
+}
+
+static void drm_sysfs_acpi_unregister(void)
+{
+	unregister_acpi_bus_type(&drm_connector_acpi_bus);
+}
+#else
+static void drm_sysfs_acpi_register(void) { }
+static void drm_sysfs_acpi_unregister(void) { }
+#endif
+
+static char *drm_devnode(const struct device *dev, umode_t *mode)
+{
+	return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
+}
+
+static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
+
+/**
+ * drm_sysfs_init - initialize sysfs helpers
+ *
+ * This is used to create the DRM class, which is the implicit parent of any
+ * other top-level DRM sysfs objects.
+ *
+ * You must call drm_sysfs_destroy() to release the allocated resources.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int drm_sysfs_init(void)
+{
+	int err;
+
+	drm_class = class_create(THIS_MODULE, "drm");
+	if (IS_ERR(drm_class))
+		return PTR_ERR(drm_class);
+
+	err = class_create_file(drm_class, &class_attr_version.attr);
+	if (err) {
+		class_destroy(drm_class);
+		drm_class = NULL;
+		return err;
+	}
+
+	drm_class->devnode = drm_devnode;
+
+	drm_sysfs_acpi_register();
+	return 0;
+}
+
+/**
+ * drm_sysfs_destroy - destroys DRM class
+ *
+ * Destroy the DRM device class.
+ */
+void drm_sysfs_destroy(void)
+{
+	if (IS_ERR_OR_NULL(drm_class))
+		return;
+	drm_sysfs_acpi_unregister();
+	class_remove_file(drm_class, &class_attr_version.attr);
+	class_destroy(drm_class);
+	drm_class = NULL;
+}
+
+static void drm_sysfs_release(struct device *dev)
+{
+	kfree(dev);
+}
+
+/*
+ * Connector properties
+ */
+static ssize_t status_store(struct device *device,
+			   struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+	struct drm_device *dev = connector->dev;
+	enum drm_connector_force old_force;
+	int ret;
+
+	ret = mutex_lock_interruptible(&dev->mode_config.mutex);
+	if (ret)
+		return ret;
+
+	old_force = connector->force;
+
+	if (sysfs_streq(buf, "detect"))
+		connector->force = 0;
+	else if (sysfs_streq(buf, "on"))
+		connector->force = DRM_FORCE_ON;
+	else if (sysfs_streq(buf, "on-digital"))
+		connector->force = DRM_FORCE_ON_DIGITAL;
+	else if (sysfs_streq(buf, "off"))
+		connector->force = DRM_FORCE_OFF;
+	else
+		ret = -EINVAL;
+
+	if (old_force != connector->force || !connector->force) {
+		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
+			      connector->base.id,
+			      connector->name,
+			      old_force, connector->force);
+
+		connector->funcs->fill_modes(connector,
+					     dev->mode_config.max_width,
+					     dev->mode_config.max_height);
+	}
+
+	mutex_unlock(&dev->mode_config.mutex);
+
+	return ret ? ret : count;
+}
+
+static ssize_t status_show(struct device *device,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+	enum drm_connector_status status;
+
+	status = READ_ONCE(connector->status);
+
+	return sysfs_emit(buf, "%s\n",
+			  drm_get_connector_status_name(status));
+}
+
+static ssize_t dpms_show(struct device *device,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+	int dpms;
+
+	dpms = READ_ONCE(connector->dpms);
+
+	return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
+}
+
+static ssize_t enabled_show(struct device *device,
+			    struct device_attribute *attr,
+			   char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+	bool enabled;
+
+	enabled = READ_ONCE(connector->encoder);
+
+	return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
+}
+
+static ssize_t edid_show(struct file *filp, struct kobject *kobj,
+			 struct bin_attribute *attr, char *buf, loff_t off,
+			 size_t count)
+{
+	struct device *connector_dev = kobj_to_dev(kobj);
+	struct drm_connector *connector = to_drm_connector(connector_dev);
+	unsigned char *edid;
+	size_t size;
+	ssize_t ret = 0;
+
+	mutex_lock(&connector->dev->mode_config.mutex);
+	if (!connector->edid_blob_ptr)
+		goto unlock;
+
+	edid = connector->edid_blob_ptr->data;
+	size = connector->edid_blob_ptr->length;
+	if (!edid)
+		goto unlock;
+
+	if (off >= size)
+		goto unlock;
+
+	if (off + count > size)
+		count = size - off;
+	memcpy(buf, edid + off, count);
+
+	ret = count;
+unlock:
+	mutex_unlock(&connector->dev->mode_config.mutex);
+
+	return ret;
+}
+
+static ssize_t modes_show(struct device *device,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+	struct drm_display_mode *mode;
+	int written = 0;
+
+	mutex_lock(&connector->dev->mode_config.mutex);
+	list_for_each_entry(mode, &connector->modes, head) {
+		written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
+				    mode->name);
+	}
+	mutex_unlock(&connector->dev->mode_config.mutex);
+
+	return written;
+}
+
+static DEVICE_ATTR_RW(status);
+static DEVICE_ATTR_RO(enabled);
+static DEVICE_ATTR_RO(dpms);
+static DEVICE_ATTR_RO(modes);
+
+static struct attribute *connector_dev_attrs[] = {
+	&dev_attr_status.attr,
+	&dev_attr_enabled.attr,
+	&dev_attr_dpms.attr,
+	&dev_attr_modes.attr,
+	NULL
+};
+
+static struct bin_attribute edid_attr = {
+	.attr.name = "edid",
+	.attr.mode = 0444,
+	.size = 0,
+	.read = edid_show,
+};
+
+static struct bin_attribute *connector_bin_attrs[] = {
+	&edid_attr,
+	NULL
+};
+
+static const struct attribute_group connector_dev_group = {
+	.attrs = connector_dev_attrs,
+	.bin_attrs = connector_bin_attrs,
+};
+
+static const struct attribute_group *connector_dev_groups[] = {
+	&connector_dev_group,
+	NULL
+};
+
+int drm_sysfs_connector_add(struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	struct device *kdev;
+	int r;
+
+	if (connector->kdev)
+		return 0;
+
+	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
+	if (!kdev)
+		return -ENOMEM;
+
+	device_initialize(kdev);
+	kdev->class = drm_class;
+	kdev->type = &drm_sysfs_device_connector;
+	kdev->parent = dev->primary->kdev;
+	kdev->groups = connector_dev_groups;
+	kdev->release = drm_sysfs_release;
+	dev_set_drvdata(kdev, connector);
+
+	r = dev_set_name(kdev, "card%d-%s", dev->primary->index, connector->name);
+	if (r)
+		goto err_free;
+
+	DRM_DEBUG("adding \"%s\" to sysfs\n",
+		  connector->name);
+
+	r = device_add(kdev);
+	if (r) {
+		drm_err(dev, "failed to register connector device: %d\n", r);
+		goto err_free;
+	}
+
+	connector->kdev = kdev;
+
+	if (connector->ddc)
+		return sysfs_create_link(&connector->kdev->kobj,
+				 &connector->ddc->dev.kobj, "ddc");
+	return 0;
+
+err_free:
+	put_device(kdev);
+	return r;
+}
+
+void drm_sysfs_connector_remove(struct drm_connector *connector)
+{
+	if (!connector->kdev)
+		return;
+
+	if (connector->ddc)
+		sysfs_remove_link(&connector->kdev->kobj, "ddc");
+
+	DRM_DEBUG("removing \"%s\" from sysfs\n",
+		  connector->name);
+
+	device_unregister(connector->kdev);
+	connector->kdev = NULL;
+}
+
+void drm_sysfs_lease_event(struct drm_device *dev)
+{
+	char *event_string = "LEASE=1";
+	char *envp[] = { event_string, NULL };
+
+	DRM_DEBUG("generating lease event\n");
+
+	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
+}
+
+/**
+ * drm_sysfs_hotplug_event - generate a DRM uevent
+ * @dev: DRM device
+ *
+ * Send a uevent for the DRM device specified by @dev.  Currently we only
+ * set HOTPLUG=1 in the uevent environment, but this could be expanded to
+ * deal with other types of events.
+ *
+ * Any new uapi should be using the drm_sysfs_connector_status_event()
+ * for uevents on connector status change.
+ */
+void drm_sysfs_hotplug_event(struct drm_device *dev)
+{
+	char *event_string = "HOTPLUG=1";
+	char *envp[] = { event_string, NULL };
+
+	DRM_DEBUG("generating hotplug event\n");
+
+	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
+}
+EXPORT_SYMBOL(drm_sysfs_hotplug_event);
+
+/**
+ * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
+ * change
+ * @connector: connector which has changed
+ *
+ * Send a uevent for the DRM connector specified by @connector. This will send
+ * a uevent with the properties HOTPLUG=1 and CONNECTOR.
+ */
+void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	char hotplug_str[] = "HOTPLUG=1", conn_id[21];
+	char *envp[] = { hotplug_str, conn_id, NULL };
+
+	snprintf(conn_id, sizeof(conn_id),
+		 "CONNECTOR=%u", connector->base.id);
+
+	drm_dbg_kms(connector->dev,
+		    "[CONNECTOR:%d:%s] generating connector hotplug event\n",
+		    connector->base.id, connector->name);
+
+	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
+}
+EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);
+
+/**
+ * drm_sysfs_connector_status_event - generate a DRM uevent for connector
+ * property status change
+ * @connector: connector on which property status changed
+ * @property: connector property whose status changed.
+ *
+ * Send a uevent for the DRM device specified by @dev.  Currently we
+ * set HOTPLUG=1 and connector id along with the attached property id
+ * related to the status change.
+ */
+void drm_sysfs_connector_status_event(struct drm_connector *connector,
+				      struct drm_property *property)
+{
+	struct drm_device *dev = connector->dev;
+	char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
+	char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
+
+	WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
+					   property->base.id));
+
+	snprintf(conn_id, ARRAY_SIZE(conn_id),
+		 "CONNECTOR=%u", connector->base.id);
+	snprintf(prop_id, ARRAY_SIZE(prop_id),
+		 "PROPERTY=%u", property->base.id);
+
+	DRM_DEBUG("generating connector status event\n");
+
+	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
+}
+EXPORT_SYMBOL(drm_sysfs_connector_status_event);
+
+struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
+{
+	const char *minor_str;
+	struct device *kdev;
+	int r;
+
+	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
+	if (!kdev)
+		return ERR_PTR(-ENOMEM);
+
+	device_initialize(kdev);
+
+	if (minor->type == DRM_MINOR_ACCEL) {
+		minor_str = "accel%d";
+		accel_set_device_instance_params(kdev, minor->index);
+	} else {
+		if (minor->type == DRM_MINOR_RENDER)
+			minor_str = "renderD%d";
+		else
+			minor_str = "card%d";
+
+		kdev->devt = MKDEV(DRM_MAJOR, minor->index);
+		kdev->class = drm_class;
+		kdev->type = &drm_sysfs_device_minor;
+	}
+
+	kdev->parent = minor->dev->dev;
+	kdev->release = drm_sysfs_release;
+	dev_set_drvdata(kdev, minor);
+
+	r = dev_set_name(kdev, minor_str, minor->index);
+	if (r < 0)
+		goto err_free;
+
+	return kdev;
+
+err_free:
+	put_device(kdev);
+	return ERR_PTR(r);
+}
+
+/**
+ * drm_class_device_register - register new device with the DRM sysfs class
+ * @dev: device to register
+ *
+ * Registers a new &struct device within the DRM sysfs class. Essentially only
+ * used by ttm to have a place for its global settings. Drivers should never use
+ * this.
+ */
+int drm_class_device_register(struct device *dev)
+{
+	if (!drm_class || IS_ERR(drm_class))
+		return -ENOENT;
+
+	dev->class = drm_class;
+	return device_register(dev);
+}
+EXPORT_SYMBOL_GPL(drm_class_device_register);
+
+/**
+ * drm_class_device_unregister - unregister device with the DRM sysfs class
+ * @dev: device to unregister
+ *
+ * Unregisters a &struct device from the DRM sysfs class. Essentially only used
+ * by ttm to have a place for its global settings. Drivers should never use
+ * this.
+ */
+void drm_class_device_unregister(struct device *dev)
+{
+	return device_unregister(dev);
+}
+EXPORT_SYMBOL_GPL(drm_class_device_unregister);