From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- drivers/gpu/drm/drm_context.c | 525 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 525 insertions(+) create mode 100644 drivers/gpu/drm/drm_context.c (limited to 'drivers/gpu/drm/drm_context.c') 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 + * Author: Gareth Hughes + * + * 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 +#include + +#include +#include +#include + +#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; +} + +/*@}*/ -- cgit v1.2.3