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, 525 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_context.c b/drivers/gpu/drm/drm_context.c
new file mode 100644
index 000000000..c6e6a3e72
--- /dev/null
+++ b/drivers/gpu/drm/drm_context.c
@@ -0,0 +1,525 @@
+/*
+ * Legacy: Generic DRM Contexts
+ *
+ * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * All Rights Reserved.
+ *
+ * Author: Rickard E. (Rik) Faith <faith@valinux.com>
+ * Author: Gareth Hughes <gareth@valinux.com>
+ *
+ * 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 (including the next
+ * paragraph) 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
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.
+ */
+
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include <drm/drm_drv.h>
+#include <drm/drm_file.h>
+#include <drm/drm_print.h>
+
+#include "drm_legacy.h"
+
+struct drm_ctx_list {
+	struct list_head head;
+	drm_context_t handle;
+	struct drm_file *tag;
+};
+
+/******************************************************************/
+/** \name Context bitmap support */
+/*@{*/
+
+/*
+ * Free a handle from the context bitmap.
+ *
+ * \param dev DRM device.
+ * \param ctx_handle context handle.
+ *
+ * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry
+ * in drm_device::ctx_idr, while holding the drm_device::struct_mutex
+ * lock.
+ */
+void drm_legacy_ctxbitmap_free(struct drm_device * dev, int ctx_handle)
+{
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return;
+
+	mutex_lock(&dev->struct_mutex);
+	idr_remove(&dev->ctx_idr, ctx_handle);
+	mutex_unlock(&dev->struct_mutex);
+}
+
+/*
+ * Context bitmap allocation.
+ *
+ * \param dev DRM device.
+ * \return (non-negative) context handle on success or a negative number on failure.
+ *
+ * Allocate a new idr from drm_device::ctx_idr while holding the
+ * drm_device::struct_mutex lock.
+ */
+static int drm_legacy_ctxbitmap_next(struct drm_device * dev)
+{
+	int ret;
+
+	mutex_lock(&dev->struct_mutex);
+	ret = idr_alloc(&dev->ctx_idr, NULL, DRM_RESERVED_CONTEXTS, 0,
+			GFP_KERNEL);
+	mutex_unlock(&dev->struct_mutex);
+	return ret;
+}
+
+/*
+ * Context bitmap initialization.
+ *
+ * \param dev DRM device.
+ *
+ * Initialise the drm_device::ctx_idr
+ */
+void drm_legacy_ctxbitmap_init(struct drm_device * dev)
+{
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return;
+
+	idr_init(&dev->ctx_idr);
+}
+
+/*
+ * Context bitmap cleanup.
+ *
+ * \param dev DRM device.
+ *
+ * Free all idr members using drm_ctx_sarea_free helper function
+ * while holding the drm_device::struct_mutex lock.
+ */
+void drm_legacy_ctxbitmap_cleanup(struct drm_device * dev)
+{
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return;
+
+	mutex_lock(&dev->struct_mutex);
+	idr_destroy(&dev->ctx_idr);
+	mutex_unlock(&dev->struct_mutex);
+}
+
+/**
+ * drm_legacy_ctxbitmap_flush() - Flush all contexts owned by a file
+ * @dev: DRM device to operate on
+ * @file: Open file to flush contexts for
+ *
+ * This iterates over all contexts on @dev and drops them if they're owned by
+ * @file. Note that after this call returns, new contexts might be added if
+ * the file is still alive.
+ */
+void drm_legacy_ctxbitmap_flush(struct drm_device *dev, struct drm_file *file)
+{
+	struct drm_ctx_list *pos, *tmp;
+
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return;
+
+	mutex_lock(&dev->ctxlist_mutex);
+
+	list_for_each_entry_safe(pos, tmp, &dev->ctxlist, head) {
+		if (pos->tag == file &&
+		    pos->handle != DRM_KERNEL_CONTEXT) {
+			if (dev->driver->context_dtor)
+				dev->driver->context_dtor(dev, pos->handle);
+
+			drm_legacy_ctxbitmap_free(dev, pos->handle);
+			list_del(&pos->head);
+			kfree(pos);
+		}
+	}
+
+	mutex_unlock(&dev->ctxlist_mutex);
+}
+
+/*@}*/
+
+/******************************************************************/
+/** \name Per Context SAREA Support */
+/*@{*/
+
+/*
+ * Get per-context SAREA.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx_priv_map structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Gets the map from drm_device::ctx_idr with the handle specified and
+ * returns its handle.
+ */
+int drm_legacy_getsareactx(struct drm_device *dev, void *data,
+			   struct drm_file *file_priv)
+{
+	struct drm_ctx_priv_map *request = data;
+	struct drm_local_map *map;
+	struct drm_map_list *_entry;
+
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return -EOPNOTSUPP;
+
+	mutex_lock(&dev->struct_mutex);
+
+	map = idr_find(&dev->ctx_idr, request->ctx_id);
+	if (!map) {
+		mutex_unlock(&dev->struct_mutex);
+		return -EINVAL;
+	}
+
+	request->handle = NULL;
+	list_for_each_entry(_entry, &dev->maplist, head) {
+		if (_entry->map == map) {
+			request->handle =
+			    (void *)(unsigned long)_entry->user_token;
+			break;
+		}
+	}
+
+	mutex_unlock(&dev->struct_mutex);
+
+	if (request->handle == NULL)
+		return -EINVAL;
+
+	return 0;
+}
+
+/*
+ * Set per-context SAREA.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx_priv_map structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Searches the mapping specified in \p arg and update the entry in
+ * drm_device::ctx_idr with it.
+ */
+int drm_legacy_setsareactx(struct drm_device *dev, void *data,
+			   struct drm_file *file_priv)
+{
+	struct drm_ctx_priv_map *request = data;
+	struct drm_local_map *map = NULL;
+	struct drm_map_list *r_list = NULL;
+
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return -EOPNOTSUPP;
+
+	mutex_lock(&dev->struct_mutex);
+	list_for_each_entry(r_list, &dev->maplist, head) {
+		if (r_list->map
+		    && r_list->user_token == (unsigned long) request->handle)
+			goto found;
+	}
+      bad:
+	mutex_unlock(&dev->struct_mutex);
+	return -EINVAL;
+
+      found:
+	map = r_list->map;
+	if (!map)
+		goto bad;
+
+	if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id)))
+		goto bad;
+
+	mutex_unlock(&dev->struct_mutex);
+
+	return 0;
+}
+
+/*@}*/
+
+/******************************************************************/
+/** \name The actual DRM context handling routines */
+/*@{*/
+
+/*
+ * Switch context.
+ *
+ * \param dev DRM device.
+ * \param old old context handle.
+ * \param new new context handle.
+ * \return zero on success or a negative number on failure.
+ *
+ * Attempt to set drm_device::context_flag.
+ */
+static int drm_context_switch(struct drm_device * dev, int old, int new)
+{
+	if (test_and_set_bit(0, &dev->context_flag)) {
+		DRM_ERROR("Reentering -- FIXME\n");
+		return -EBUSY;
+	}
+
+	DRM_DEBUG("Context switch from %d to %d\n", old, new);
+
+	if (new == dev->last_context) {
+		clear_bit(0, &dev->context_flag);
+		return 0;
+	}
+
+	return 0;
+}
+
+/*
+ * Complete context switch.
+ *
+ * \param dev DRM device.
+ * \param new new context handle.
+ * \return zero on success or a negative number on failure.
+ *
+ * Updates drm_device::last_context and drm_device::last_switch. Verifies the
+ * hardware lock is held, clears the drm_device::context_flag and wakes up
+ * drm_device::context_wait.
+ */
+static int drm_context_switch_complete(struct drm_device *dev,
+				       struct drm_file *file_priv, int new)
+{
+	dev->last_context = new;	/* PRE/POST: This is the _only_ writer. */
+
+	if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) {
+		DRM_ERROR("Lock isn't held after context switch\n");
+	}
+
+	/* If a context switch is ever initiated
+	   when the kernel holds the lock, release
+	   that lock here.
+	 */
+	clear_bit(0, &dev->context_flag);
+
+	return 0;
+}
+
+/*
+ * Reserve contexts.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx_res structure.
+ * \return zero on success or a negative number on failure.
+ */
+int drm_legacy_resctx(struct drm_device *dev, void *data,
+		      struct drm_file *file_priv)
+{
+	struct drm_ctx_res *res = data;
+	struct drm_ctx ctx;
+	int i;
+
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return -EOPNOTSUPP;
+
+	if (res->count >= DRM_RESERVED_CONTEXTS) {
+		memset(&ctx, 0, sizeof(ctx));
+		for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
+			ctx.handle = i;
+			if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx)))
+				return -EFAULT;
+		}
+	}
+	res->count = DRM_RESERVED_CONTEXTS;
+
+	return 0;
+}
+
+/*
+ * Add context.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Get a new handle for the context and copy to userspace.
+ */
+int drm_legacy_addctx(struct drm_device *dev, void *data,
+		      struct drm_file *file_priv)
+{
+	struct drm_ctx_list *ctx_entry;
+	struct drm_ctx *ctx = data;
+	int tmp_handle;
+
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return -EOPNOTSUPP;
+
+	tmp_handle = drm_legacy_ctxbitmap_next(dev);
+	if (tmp_handle == DRM_KERNEL_CONTEXT) {
+		/* Skip kernel's context and get a new one. */
+		tmp_handle = drm_legacy_ctxbitmap_next(dev);
+	}
+	DRM_DEBUG("%d\n", tmp_handle);
+	if (tmp_handle < 0) {
+		DRM_DEBUG("Not enough free contexts.\n");
+		/* Should this return -EBUSY instead? */
+		return tmp_handle;
+	}
+
+	ctx->handle = tmp_handle;
+
+	ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
+	if (!ctx_entry) {
+		DRM_DEBUG("out of memory\n");
+		return -ENOMEM;
+	}
+
+	INIT_LIST_HEAD(&ctx_entry->head);
+	ctx_entry->handle = ctx->handle;
+	ctx_entry->tag = file_priv;
+
+	mutex_lock(&dev->ctxlist_mutex);
+	list_add(&ctx_entry->head, &dev->ctxlist);
+	mutex_unlock(&dev->ctxlist_mutex);
+
+	return 0;
+}
+
+/*
+ * Get context.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx structure.
+ * \return zero on success or a negative number on failure.
+ */
+int drm_legacy_getctx(struct drm_device *dev, void *data,
+		      struct drm_file *file_priv)
+{
+	struct drm_ctx *ctx = data;
+
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return -EOPNOTSUPP;
+
+	/* This is 0, because we don't handle any context flags */
+	ctx->flags = 0;
+
+	return 0;
+}
+
+/*
+ * Switch context.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Calls context_switch().
+ */
+int drm_legacy_switchctx(struct drm_device *dev, void *data,
+			 struct drm_file *file_priv)
+{
+	struct drm_ctx *ctx = data;
+
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return -EOPNOTSUPP;
+
+	DRM_DEBUG("%d\n", ctx->handle);
+	return drm_context_switch(dev, dev->last_context, ctx->handle);
+}
+
+/*
+ * New context.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Calls context_switch_complete().
+ */
+int drm_legacy_newctx(struct drm_device *dev, void *data,
+		      struct drm_file *file_priv)
+{
+	struct drm_ctx *ctx = data;
+
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return -EOPNOTSUPP;
+
+	DRM_DEBUG("%d\n", ctx->handle);
+	drm_context_switch_complete(dev, file_priv, ctx->handle);
+
+	return 0;
+}
+
+/*
+ * Remove context.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * If not the special kernel context, calls ctxbitmap_free() to free the specified context.
+ */
+int drm_legacy_rmctx(struct drm_device *dev, void *data,
+		     struct drm_file *file_priv)
+{
+	struct drm_ctx *ctx = data;
+
+	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+	    !drm_core_check_feature(dev, DRIVER_LEGACY))
+		return -EOPNOTSUPP;
+
+	DRM_DEBUG("%d\n", ctx->handle);
+	if (ctx->handle != DRM_KERNEL_CONTEXT) {
+		if (dev->driver->context_dtor)
+			dev->driver->context_dtor(dev, ctx->handle);
+		drm_legacy_ctxbitmap_free(dev, ctx->handle);
+	}
+
+	mutex_lock(&dev->ctxlist_mutex);
+	if (!list_empty(&dev->ctxlist)) {
+		struct drm_ctx_list *pos, *n;
+
+		list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
+			if (pos->handle == ctx->handle) {
+				list_del(&pos->head);
+				kfree(pos);
+			}
+		}
+	}
+	mutex_unlock(&dev->ctxlist_mutex);
+
+	return 0;
+}
+
+/*@}*/