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(). ... --- tools/perf/util/thread.c | 479 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 479 insertions(+) create mode 100644 tools/perf/util/thread.c (limited to 'tools/perf/util/thread.c') diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c new file mode 100644 index 000000000..e3e5427e1 --- /dev/null +++ b/tools/perf/util/thread.c @@ -0,0 +1,479 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include "dso.h" +#include "session.h" +#include "thread.h" +#include "thread-stack.h" +#include "debug.h" +#include "namespaces.h" +#include "comm.h" +#include "map.h" +#include "symbol.h" +#include "unwind.h" +#include "callchain.h" + +#include + +int thread__init_maps(struct thread *thread, struct machine *machine) +{ + pid_t pid = thread->pid_; + + if (pid == thread->tid || pid == -1) { + thread->maps = maps__new(machine); + } else { + struct thread *leader = __machine__findnew_thread(machine, pid, pid); + if (leader) { + thread->maps = maps__get(leader->maps); + thread__put(leader); + } + } + + return thread->maps ? 0 : -1; +} + +struct thread *thread__new(pid_t pid, pid_t tid) +{ + char *comm_str; + struct comm *comm; + struct thread *thread = zalloc(sizeof(*thread)); + + if (thread != NULL) { + thread->pid_ = pid; + thread->tid = tid; + thread->ppid = -1; + thread->cpu = -1; + thread->guest_cpu = -1; + thread->lbr_stitch_enable = false; + INIT_LIST_HEAD(&thread->namespaces_list); + INIT_LIST_HEAD(&thread->comm_list); + init_rwsem(&thread->namespaces_lock); + init_rwsem(&thread->comm_lock); + + comm_str = malloc(32); + if (!comm_str) + goto err_thread; + + snprintf(comm_str, 32, ":%d", tid); + comm = comm__new(comm_str, 0, false); + free(comm_str); + if (!comm) + goto err_thread; + + list_add(&comm->list, &thread->comm_list); + refcount_set(&thread->refcnt, 1); + RB_CLEAR_NODE(&thread->rb_node); + /* Thread holds first ref to nsdata. */ + thread->nsinfo = nsinfo__new(pid); + srccode_state_init(&thread->srccode_state); + } + + return thread; + +err_thread: + free(thread); + return NULL; +} + +void thread__delete(struct thread *thread) +{ + struct namespaces *namespaces, *tmp_namespaces; + struct comm *comm, *tmp_comm; + + BUG_ON(!RB_EMPTY_NODE(&thread->rb_node)); + + thread_stack__free(thread); + + if (thread->maps) { + maps__put(thread->maps); + thread->maps = NULL; + } + down_write(&thread->namespaces_lock); + list_for_each_entry_safe(namespaces, tmp_namespaces, + &thread->namespaces_list, list) { + list_del_init(&namespaces->list); + namespaces__free(namespaces); + } + up_write(&thread->namespaces_lock); + + down_write(&thread->comm_lock); + list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) { + list_del_init(&comm->list); + comm__free(comm); + } + up_write(&thread->comm_lock); + + nsinfo__zput(thread->nsinfo); + srccode_state_free(&thread->srccode_state); + + exit_rwsem(&thread->namespaces_lock); + exit_rwsem(&thread->comm_lock); + thread__free_stitch_list(thread); + free(thread); +} + +struct thread *thread__get(struct thread *thread) +{ + if (thread) + refcount_inc(&thread->refcnt); + return thread; +} + +void thread__put(struct thread *thread) +{ + if (thread && refcount_dec_and_test(&thread->refcnt)) { + /* + * Remove it from the dead threads list, as last reference is + * gone, if it is in a dead threads list. + * + * We may not be there anymore if say, the machine where it was + * stored was already deleted, so we already removed it from + * the dead threads and some other piece of code still keeps a + * reference. + * + * This is what 'perf sched' does and finally drops it in + * perf_sched__lat(), where it calls perf_sched__read_events(), + * that processes the events by creating a session and deleting + * it, which ends up destroying the list heads for the dead + * threads, but before it does that it removes all threads from + * it using list_del_init(). + * + * So we need to check here if it is in a dead threads list and + * if so, remove it before finally deleting the thread, to avoid + * an use after free situation. + */ + if (!list_empty(&thread->node)) + list_del_init(&thread->node); + thread__delete(thread); + } +} + +static struct namespaces *__thread__namespaces(const struct thread *thread) +{ + if (list_empty(&thread->namespaces_list)) + return NULL; + + return list_first_entry(&thread->namespaces_list, struct namespaces, list); +} + +struct namespaces *thread__namespaces(struct thread *thread) +{ + struct namespaces *ns; + + down_read(&thread->namespaces_lock); + ns = __thread__namespaces(thread); + up_read(&thread->namespaces_lock); + + return ns; +} + +static int __thread__set_namespaces(struct thread *thread, u64 timestamp, + struct perf_record_namespaces *event) +{ + struct namespaces *new, *curr = __thread__namespaces(thread); + + new = namespaces__new(event); + if (!new) + return -ENOMEM; + + list_add(&new->list, &thread->namespaces_list); + + if (timestamp && curr) { + /* + * setns syscall must have changed few or all the namespaces + * of this thread. Update end time for the namespaces + * previously used. + */ + curr = list_next_entry(new, list); + curr->end_time = timestamp; + } + + return 0; +} + +int thread__set_namespaces(struct thread *thread, u64 timestamp, + struct perf_record_namespaces *event) +{ + int ret; + + down_write(&thread->namespaces_lock); + ret = __thread__set_namespaces(thread, timestamp, event); + up_write(&thread->namespaces_lock); + return ret; +} + +struct comm *thread__comm(const struct thread *thread) +{ + if (list_empty(&thread->comm_list)) + return NULL; + + return list_first_entry(&thread->comm_list, struct comm, list); +} + +struct comm *thread__exec_comm(const struct thread *thread) +{ + struct comm *comm, *last = NULL, *second_last = NULL; + + list_for_each_entry(comm, &thread->comm_list, list) { + if (comm->exec) + return comm; + second_last = last; + last = comm; + } + + /* + * 'last' with no start time might be the parent's comm of a synthesized + * thread (created by processing a synthesized fork event). For a main + * thread, that is very probably wrong. Prefer a later comm to avoid + * that case. + */ + if (second_last && !last->start && thread->pid_ == thread->tid) + return second_last; + + return last; +} + +static int ____thread__set_comm(struct thread *thread, const char *str, + u64 timestamp, bool exec) +{ + struct comm *new, *curr = thread__comm(thread); + + /* Override the default :tid entry */ + if (!thread->comm_set) { + int err = comm__override(curr, str, timestamp, exec); + if (err) + return err; + } else { + new = comm__new(str, timestamp, exec); + if (!new) + return -ENOMEM; + list_add(&new->list, &thread->comm_list); + + if (exec) + unwind__flush_access(thread->maps); + } + + thread->comm_set = true; + + return 0; +} + +int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp, + bool exec) +{ + int ret; + + down_write(&thread->comm_lock); + ret = ____thread__set_comm(thread, str, timestamp, exec); + up_write(&thread->comm_lock); + return ret; +} + +int thread__set_comm_from_proc(struct thread *thread) +{ + char path[64]; + char *comm = NULL; + size_t sz; + int err = -1; + + if (!(snprintf(path, sizeof(path), "%d/task/%d/comm", + thread->pid_, thread->tid) >= (int)sizeof(path)) && + procfs__read_str(path, &comm, &sz) == 0) { + comm[sz - 1] = '\0'; + err = thread__set_comm(thread, comm, 0); + } + + return err; +} + +static const char *__thread__comm_str(const struct thread *thread) +{ + const struct comm *comm = thread__comm(thread); + + if (!comm) + return NULL; + + return comm__str(comm); +} + +const char *thread__comm_str(struct thread *thread) +{ + const char *str; + + down_read(&thread->comm_lock); + str = __thread__comm_str(thread); + up_read(&thread->comm_lock); + + return str; +} + +/* CHECKME: it should probably better return the max comm len from its comm list */ +int thread__comm_len(struct thread *thread) +{ + if (!thread->comm_len) { + const char *comm = thread__comm_str(thread); + if (!comm) + return 0; + thread->comm_len = strlen(comm); + } + + return thread->comm_len; +} + +size_t thread__fprintf(struct thread *thread, FILE *fp) +{ + return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) + + maps__fprintf(thread->maps, fp); +} + +int thread__insert_map(struct thread *thread, struct map *map) +{ + int ret; + + ret = unwind__prepare_access(thread->maps, map, NULL); + if (ret) + return ret; + + maps__fixup_overlappings(thread->maps, map, stderr); + maps__insert(thread->maps, map); + + return 0; +} + +static int __thread__prepare_access(struct thread *thread) +{ + bool initialized = false; + int err = 0; + struct maps *maps = thread->maps; + struct map *map; + + down_read(&maps->lock); + + maps__for_each_entry(maps, map) { + err = unwind__prepare_access(thread->maps, map, &initialized); + if (err || initialized) + break; + } + + up_read(&maps->lock); + + return err; +} + +static int thread__prepare_access(struct thread *thread) +{ + int err = 0; + + if (dwarf_callchain_users) + err = __thread__prepare_access(thread); + + return err; +} + +static int thread__clone_maps(struct thread *thread, struct thread *parent, bool do_maps_clone) +{ + /* This is new thread, we share map groups for process. */ + if (thread->pid_ == parent->pid_) + return thread__prepare_access(thread); + + if (thread->maps == parent->maps) { + pr_debug("broken map groups on thread %d/%d parent %d/%d\n", + thread->pid_, thread->tid, parent->pid_, parent->tid); + return 0; + } + /* But this one is new process, copy maps. */ + return do_maps_clone ? maps__clone(thread, parent->maps) : 0; +} + +int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp, bool do_maps_clone) +{ + if (parent->comm_set) { + const char *comm = thread__comm_str(parent); + int err; + if (!comm) + return -ENOMEM; + err = thread__set_comm(thread, comm, timestamp); + if (err) + return err; + } + + thread->ppid = parent->tid; + return thread__clone_maps(thread, parent, do_maps_clone); +} + +void thread__find_cpumode_addr_location(struct thread *thread, u64 addr, + struct addr_location *al) +{ + size_t i; + const u8 cpumodes[] = { + PERF_RECORD_MISC_USER, + PERF_RECORD_MISC_KERNEL, + PERF_RECORD_MISC_GUEST_USER, + PERF_RECORD_MISC_GUEST_KERNEL + }; + + for (i = 0; i < ARRAY_SIZE(cpumodes); i++) { + thread__find_symbol(thread, cpumodes[i], addr, al); + if (al->map) + break; + } +} + +struct thread *thread__main_thread(struct machine *machine, struct thread *thread) +{ + if (thread->pid_ == thread->tid) + return thread__get(thread); + + if (thread->pid_ == -1) + return NULL; + + return machine__find_thread(machine, thread->pid_, thread->pid_); +} + +int thread__memcpy(struct thread *thread, struct machine *machine, + void *buf, u64 ip, int len, bool *is64bit) +{ + u8 cpumode = PERF_RECORD_MISC_USER; + struct addr_location al; + long offset; + + if (machine__kernel_ip(machine, ip)) + cpumode = PERF_RECORD_MISC_KERNEL; + + if (!thread__find_map(thread, cpumode, ip, &al) || !al.map->dso || + al.map->dso->data.status == DSO_DATA_STATUS_ERROR || + map__load(al.map) < 0) + return -1; + + offset = al.map->map_ip(al.map, ip); + if (is64bit) + *is64bit = al.map->dso->is_64_bit; + + return dso__data_read_offset(al.map->dso, machine, offset, buf, len); +} + +void thread__free_stitch_list(struct thread *thread) +{ + struct lbr_stitch *lbr_stitch = thread->lbr_stitch; + struct stitch_list *pos, *tmp; + + if (!lbr_stitch) + return; + + list_for_each_entry_safe(pos, tmp, &lbr_stitch->lists, node) { + list_del_init(&pos->node); + free(pos); + } + + list_for_each_entry_safe(pos, tmp, &lbr_stitch->free_lists, node) { + list_del_init(&pos->node); + free(pos); + } + + zfree(&lbr_stitch->prev_lbr_cursor); + zfree(&thread->lbr_stitch); +} -- cgit v1.2.3