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/i915/gt/intel_gt_buffer_pool.c | 246 +++++++++++++++++++++++++ 1 file changed, 246 insertions(+) create mode 100644 drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c (limited to 'drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c') diff --git a/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c b/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c new file mode 100644 index 000000000..cadfd8578 --- /dev/null +++ b/drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c @@ -0,0 +1,246 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2014-2018 Intel Corporation + */ + +#include "gem/i915_gem_internal.h" +#include "gem/i915_gem_object.h" + +#include "i915_drv.h" +#include "intel_engine_pm.h" +#include "intel_gt_buffer_pool.h" + +static struct list_head * +bucket_for_size(struct intel_gt_buffer_pool *pool, size_t sz) +{ + int n; + + /* + * Compute a power-of-two bucket, but throw everything greater than + * 16KiB into the same bucket: i.e. the buckets hold objects of + * (1 page, 2 pages, 4 pages, 8+ pages). + */ + n = fls(sz >> PAGE_SHIFT) - 1; + if (n >= ARRAY_SIZE(pool->cache_list)) + n = ARRAY_SIZE(pool->cache_list) - 1; + + return &pool->cache_list[n]; +} + +static void node_free(struct intel_gt_buffer_pool_node *node) +{ + i915_gem_object_put(node->obj); + i915_active_fini(&node->active); + kfree_rcu(node, rcu); +} + +static bool pool_free_older_than(struct intel_gt_buffer_pool *pool, long keep) +{ + struct intel_gt_buffer_pool_node *node, *stale = NULL; + bool active = false; + int n; + + /* Free buffers that have not been used in the past second */ + for (n = 0; n < ARRAY_SIZE(pool->cache_list); n++) { + struct list_head *list = &pool->cache_list[n]; + + if (list_empty(list)) + continue; + + if (spin_trylock_irq(&pool->lock)) { + struct list_head *pos; + + /* Most recent at head; oldest at tail */ + list_for_each_prev(pos, list) { + unsigned long age; + + node = list_entry(pos, typeof(*node), link); + + age = READ_ONCE(node->age); + if (!age || jiffies - age < keep) + break; + + /* Check we are the first to claim this node */ + if (!xchg(&node->age, 0)) + break; + + node->free = stale; + stale = node; + } + if (!list_is_last(pos, list)) + __list_del_many(pos, list); + + spin_unlock_irq(&pool->lock); + } + + active |= !list_empty(list); + } + + while ((node = stale)) { + stale = stale->free; + node_free(node); + } + + return active; +} + +static void pool_free_work(struct work_struct *wrk) +{ + struct intel_gt_buffer_pool *pool = + container_of(wrk, typeof(*pool), work.work); + + if (pool_free_older_than(pool, HZ)) + schedule_delayed_work(&pool->work, + round_jiffies_up_relative(HZ)); +} + +static void pool_retire(struct i915_active *ref) +{ + struct intel_gt_buffer_pool_node *node = + container_of(ref, typeof(*node), active); + struct intel_gt_buffer_pool *pool = node->pool; + struct list_head *list = bucket_for_size(pool, node->obj->base.size); + unsigned long flags; + + if (node->pinned) { + i915_gem_object_unpin_pages(node->obj); + + /* Return this object to the shrinker pool */ + i915_gem_object_make_purgeable(node->obj); + node->pinned = false; + } + + GEM_BUG_ON(node->age); + spin_lock_irqsave(&pool->lock, flags); + list_add_rcu(&node->link, list); + WRITE_ONCE(node->age, jiffies ?: 1); /* 0 reserved for active nodes */ + spin_unlock_irqrestore(&pool->lock, flags); + + schedule_delayed_work(&pool->work, + round_jiffies_up_relative(HZ)); +} + +void intel_gt_buffer_pool_mark_used(struct intel_gt_buffer_pool_node *node) +{ + assert_object_held(node->obj); + + if (node->pinned) + return; + + __i915_gem_object_pin_pages(node->obj); + /* Hide this pinned object from the shrinker until retired */ + i915_gem_object_make_unshrinkable(node->obj); + node->pinned = true; +} + +static struct intel_gt_buffer_pool_node * +node_create(struct intel_gt_buffer_pool *pool, size_t sz, + enum i915_map_type type) +{ + struct intel_gt *gt = container_of(pool, struct intel_gt, buffer_pool); + struct intel_gt_buffer_pool_node *node; + struct drm_i915_gem_object *obj; + + node = kmalloc(sizeof(*node), + GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); + if (!node) + return ERR_PTR(-ENOMEM); + + node->age = 0; + node->pool = pool; + node->pinned = false; + i915_active_init(&node->active, NULL, pool_retire, 0); + + obj = i915_gem_object_create_internal(gt->i915, sz); + if (IS_ERR(obj)) { + i915_active_fini(&node->active); + kfree(node); + return ERR_CAST(obj); + } + + i915_gem_object_set_readonly(obj); + + node->type = type; + node->obj = obj; + return node; +} + +struct intel_gt_buffer_pool_node * +intel_gt_get_buffer_pool(struct intel_gt *gt, size_t size, + enum i915_map_type type) +{ + struct intel_gt_buffer_pool *pool = >->buffer_pool; + struct intel_gt_buffer_pool_node *node; + struct list_head *list; + int ret; + + size = PAGE_ALIGN(size); + list = bucket_for_size(pool, size); + + rcu_read_lock(); + list_for_each_entry_rcu(node, list, link) { + unsigned long age; + + if (node->obj->base.size < size) + continue; + + if (node->type != type) + continue; + + age = READ_ONCE(node->age); + if (!age) + continue; + + if (cmpxchg(&node->age, age, 0) == age) { + spin_lock_irq(&pool->lock); + list_del_rcu(&node->link); + spin_unlock_irq(&pool->lock); + break; + } + } + rcu_read_unlock(); + + if (&node->link == list) { + node = node_create(pool, size, type); + if (IS_ERR(node)) + return node; + } + + ret = i915_active_acquire(&node->active); + if (ret) { + node_free(node); + return ERR_PTR(ret); + } + + return node; +} + +void intel_gt_init_buffer_pool(struct intel_gt *gt) +{ + struct intel_gt_buffer_pool *pool = >->buffer_pool; + int n; + + spin_lock_init(&pool->lock); + for (n = 0; n < ARRAY_SIZE(pool->cache_list); n++) + INIT_LIST_HEAD(&pool->cache_list[n]); + INIT_DELAYED_WORK(&pool->work, pool_free_work); +} + +void intel_gt_flush_buffer_pool(struct intel_gt *gt) +{ + struct intel_gt_buffer_pool *pool = >->buffer_pool; + + do { + while (pool_free_older_than(pool, 0)) + ; + } while (cancel_delayed_work_sync(&pool->work)); +} + +void intel_gt_fini_buffer_pool(struct intel_gt *gt) +{ + struct intel_gt_buffer_pool *pool = >->buffer_pool; + int n; + + for (n = 0; n < ARRAY_SIZE(pool->cache_list); n++) + GEM_BUG_ON(!list_empty(&pool->cache_list[n])); +} -- cgit v1.2.3