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/build-id.c | 1022 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1022 insertions(+) create mode 100644 tools/perf/util/build-id.c (limited to 'tools/perf/util/build-id.c') diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c new file mode 100644 index 000000000..ea9c083ab --- /dev/null +++ b/tools/perf/util/build-id.c @@ -0,0 +1,1022 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * build-id.c + * + * build-id support + * + * Copyright (C) 2009, 2010 Red Hat Inc. + * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo + */ +#include "util.h" // lsdir(), mkdir_p(), rm_rf() +#include +#include +#include +#include +#include +#include "util/copyfile.h" +#include "dso.h" +#include "build-id.h" +#include "event.h" +#include "namespaces.h" +#include "map.h" +#include "symbol.h" +#include "thread.h" +#include +#include "debug.h" +#include "session.h" +#include "tool.h" +#include "header.h" +#include "vdso.h" +#include "path.h" +#include "probe-file.h" +#include "strlist.h" + +#ifdef HAVE_DEBUGINFOD_SUPPORT +#include +#endif + +#include +#include +#include +#include + +static bool no_buildid_cache; + +int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused, + union perf_event *event, + struct perf_sample *sample, + struct evsel *evsel __maybe_unused, + struct machine *machine) +{ + struct addr_location al; + struct thread *thread = machine__findnew_thread(machine, sample->pid, + sample->tid); + + if (thread == NULL) { + pr_err("problem processing %d event, skipping it.\n", + event->header.type); + return -1; + } + + if (thread__find_map(thread, sample->cpumode, sample->ip, &al)) + al.map->dso->hit = 1; + + thread__put(thread); + return 0; +} + +static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused, + union perf_event *event, + struct perf_sample *sample + __maybe_unused, + struct machine *machine) +{ + struct thread *thread = machine__findnew_thread(machine, + event->fork.pid, + event->fork.tid); + + dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid, + event->fork.ppid, event->fork.ptid); + + if (thread) { + machine__remove_thread(machine, thread); + thread__put(thread); + } + + return 0; +} + +struct perf_tool build_id__mark_dso_hit_ops = { + .sample = build_id__mark_dso_hit, + .mmap = perf_event__process_mmap, + .mmap2 = perf_event__process_mmap2, + .fork = perf_event__process_fork, + .exit = perf_event__exit_del_thread, + .attr = perf_event__process_attr, + .build_id = perf_event__process_build_id, + .ordered_events = true, +}; + +int build_id__sprintf(const struct build_id *build_id, char *bf) +{ + char *bid = bf; + const u8 *raw = build_id->data; + size_t i; + + bf[0] = 0x0; + + for (i = 0; i < build_id->size; ++i) { + sprintf(bid, "%02x", *raw); + ++raw; + bid += 2; + } + + return (bid - bf) + 1; +} + +int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id) +{ + char notes[PATH_MAX]; + struct build_id bid; + int ret; + + if (!root_dir) + root_dir = ""; + + scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir); + + ret = sysfs__read_build_id(notes, &bid); + if (ret < 0) + return ret; + + return build_id__sprintf(&bid, sbuild_id); +} + +int filename__sprintf_build_id(const char *pathname, char *sbuild_id) +{ + struct build_id bid; + int ret; + + ret = filename__read_build_id(pathname, &bid); + if (ret < 0) + return ret; + + return build_id__sprintf(&bid, sbuild_id); +} + +/* asnprintf consolidates asprintf and snprintf */ +static int asnprintf(char **strp, size_t size, const char *fmt, ...) +{ + va_list ap; + int ret; + + if (!strp) + return -EINVAL; + + va_start(ap, fmt); + if (*strp) + ret = vsnprintf(*strp, size, fmt, ap); + else + ret = vasprintf(strp, fmt, ap); + va_end(ap); + + return ret; +} + +char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf, + size_t size) +{ + bool retry_old = true; + + snprintf(bf, size, "%s/%s/%s/kallsyms", + buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); +retry: + if (!access(bf, F_OK)) + return bf; + if (retry_old) { + /* Try old style kallsyms cache */ + snprintf(bf, size, "%s/%s/%s", + buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); + retry_old = false; + goto retry; + } + + return NULL; +} + +char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size) +{ + char *tmp = bf; + int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir, + sbuild_id, sbuild_id + 2); + if (ret < 0 || (tmp && size < (unsigned int)ret)) + return NULL; + return bf; +} + +/* The caller is responsible to free the returned buffer. */ +char *build_id_cache__origname(const char *sbuild_id) +{ + char *linkname; + char buf[PATH_MAX]; + char *ret = NULL, *p; + size_t offs = 5; /* == strlen("../..") */ + ssize_t len; + + linkname = build_id_cache__linkname(sbuild_id, NULL, 0); + if (!linkname) + return NULL; + + len = readlink(linkname, buf, sizeof(buf) - 1); + if (len <= 0) + goto out; + buf[len] = '\0'; + + /* The link should be "../../" */ + p = strrchr(buf, '/'); /* Cut off the "/" */ + if (p && (p > buf + offs)) { + *p = '\0'; + if (buf[offs + 1] == '[') + offs++; /* + * This is a DSO name, like [kernel.kallsyms]. + * Skip the first '/', since this is not the + * cache of a regular file. + */ + ret = strdup(buf + offs); /* Skip "../..[/]" */ + } +out: + free(linkname); + return ret; +} + +/* Check if the given build_id cache is valid on current running system */ +static bool build_id_cache__valid_id(char *sbuild_id) +{ + char real_sbuild_id[SBUILD_ID_SIZE] = ""; + char *pathname; + int ret = 0; + bool result = false; + + pathname = build_id_cache__origname(sbuild_id); + if (!pathname) + return false; + + if (!strcmp(pathname, DSO__NAME_KALLSYMS)) + ret = sysfs__sprintf_build_id("/", real_sbuild_id); + else if (pathname[0] == '/') + ret = filename__sprintf_build_id(pathname, real_sbuild_id); + else + ret = -EINVAL; /* Should we support other special DSO cache? */ + if (ret >= 0) + result = (strcmp(sbuild_id, real_sbuild_id) == 0); + free(pathname); + + return result; +} + +static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso, + bool is_debug) +{ + return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ? + "debug" : "elf")); +} + +char *__dso__build_id_filename(const struct dso *dso, char *bf, size_t size, + bool is_debug, bool is_kallsyms) +{ + bool is_vdso = dso__is_vdso((struct dso *)dso); + char sbuild_id[SBUILD_ID_SIZE]; + char *linkname; + bool alloc = (bf == NULL); + int ret; + + if (!dso->has_build_id) + return NULL; + + build_id__sprintf(&dso->bid, sbuild_id); + linkname = build_id_cache__linkname(sbuild_id, NULL, 0); + if (!linkname) + return NULL; + + /* Check if old style build_id cache */ + if (is_regular_file(linkname)) + ret = asnprintf(&bf, size, "%s", linkname); + else + ret = asnprintf(&bf, size, "%s/%s", linkname, + build_id_cache__basename(is_kallsyms, is_vdso, + is_debug)); + if (ret < 0 || (!alloc && size < (unsigned int)ret)) + bf = NULL; + free(linkname); + + return bf; +} + +char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size, + bool is_debug) +{ + bool is_kallsyms = dso__is_kallsyms((struct dso *)dso); + + return __dso__build_id_filename(dso, bf, size, is_debug, is_kallsyms); +} + +static int write_buildid(const char *name, size_t name_len, struct build_id *bid, + pid_t pid, u16 misc, struct feat_fd *fd) +{ + int err; + struct perf_record_header_build_id b; + size_t len; + + len = name_len + 1; + len = PERF_ALIGN(len, NAME_ALIGN); + + memset(&b, 0, sizeof(b)); + memcpy(&b.data, bid->data, bid->size); + b.size = (u8) bid->size; + misc |= PERF_RECORD_MISC_BUILD_ID_SIZE; + b.pid = pid; + b.header.misc = misc; + b.header.size = sizeof(b) + len; + + err = do_write(fd, &b, sizeof(b)); + if (err < 0) + return err; + + return write_padded(fd, name, name_len + 1, len); +} + +static int machine__write_buildid_table(struct machine *machine, + struct feat_fd *fd) +{ + int err = 0; + struct dso *pos; + u16 kmisc = PERF_RECORD_MISC_KERNEL, + umisc = PERF_RECORD_MISC_USER; + + if (!machine__is_host(machine)) { + kmisc = PERF_RECORD_MISC_GUEST_KERNEL; + umisc = PERF_RECORD_MISC_GUEST_USER; + } + + dsos__for_each_with_build_id(pos, &machine->dsos.head) { + const char *name; + size_t name_len; + bool in_kernel = false; + + if (!pos->hit && !dso__is_vdso(pos)) + continue; + + if (dso__is_vdso(pos)) { + name = pos->short_name; + name_len = pos->short_name_len; + } else if (dso__is_kcore(pos)) { + name = machine->mmap_name; + name_len = strlen(name); + } else { + name = pos->long_name; + name_len = pos->long_name_len; + } + + in_kernel = pos->kernel || + is_kernel_module(name, + PERF_RECORD_MISC_CPUMODE_UNKNOWN); + err = write_buildid(name, name_len, &pos->bid, machine->pid, + in_kernel ? kmisc : umisc, fd); + if (err) + break; + } + + return err; +} + +int perf_session__write_buildid_table(struct perf_session *session, + struct feat_fd *fd) +{ + struct rb_node *nd; + int err = machine__write_buildid_table(&session->machines.host, fd); + + if (err) + return err; + + for (nd = rb_first_cached(&session->machines.guests); nd; + nd = rb_next(nd)) { + struct machine *pos = rb_entry(nd, struct machine, rb_node); + err = machine__write_buildid_table(pos, fd); + if (err) + break; + } + return err; +} + +static int __dsos__hit_all(struct list_head *head) +{ + struct dso *pos; + + list_for_each_entry(pos, head, node) + pos->hit = true; + + return 0; +} + +static int machine__hit_all_dsos(struct machine *machine) +{ + return __dsos__hit_all(&machine->dsos.head); +} + +int dsos__hit_all(struct perf_session *session) +{ + struct rb_node *nd; + int err; + + err = machine__hit_all_dsos(&session->machines.host); + if (err) + return err; + + for (nd = rb_first_cached(&session->machines.guests); nd; + nd = rb_next(nd)) { + struct machine *pos = rb_entry(nd, struct machine, rb_node); + + err = machine__hit_all_dsos(pos); + if (err) + return err; + } + + return 0; +} + +void disable_buildid_cache(void) +{ + no_buildid_cache = true; +} + +static bool lsdir_bid_head_filter(const char *name __maybe_unused, + struct dirent *d) +{ + return (strlen(d->d_name) == 2) && + isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]); +} + +static bool lsdir_bid_tail_filter(const char *name __maybe_unused, + struct dirent *d) +{ + int i = 0; + while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3) + i++; + return (i >= SBUILD_ID_MIN_SIZE - 3) && (i <= SBUILD_ID_SIZE - 3) && + (d->d_name[i] == '\0'); +} + +struct strlist *build_id_cache__list_all(bool validonly) +{ + struct strlist *toplist, *linklist = NULL, *bidlist; + struct str_node *nd, *nd2; + char *topdir, *linkdir = NULL; + char sbuild_id[SBUILD_ID_SIZE]; + + /* for filename__ functions */ + if (validonly) + symbol__init(NULL); + + /* Open the top-level directory */ + if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0) + return NULL; + + bidlist = strlist__new(NULL, NULL); + if (!bidlist) + goto out; + + toplist = lsdir(topdir, lsdir_bid_head_filter); + if (!toplist) { + pr_debug("Error in lsdir(%s): %d\n", topdir, errno); + /* If there is no buildid cache, return an empty list */ + if (errno == ENOENT) + goto out; + goto err_out; + } + + strlist__for_each_entry(nd, toplist) { + if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) + goto err_out; + /* Open the lower-level directory */ + linklist = lsdir(linkdir, lsdir_bid_tail_filter); + if (!linklist) { + pr_debug("Error in lsdir(%s): %d\n", linkdir, errno); + goto err_out; + } + strlist__for_each_entry(nd2, linklist) { + if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s", + nd->s, nd2->s) > SBUILD_ID_SIZE - 1) + goto err_out; + if (validonly && !build_id_cache__valid_id(sbuild_id)) + continue; + if (strlist__add(bidlist, sbuild_id) < 0) + goto err_out; + } + strlist__delete(linklist); + zfree(&linkdir); + } + +out_free: + strlist__delete(toplist); +out: + free(topdir); + + return bidlist; + +err_out: + strlist__delete(linklist); + zfree(&linkdir); + strlist__delete(bidlist); + bidlist = NULL; + goto out_free; +} + +static bool str_is_build_id(const char *maybe_sbuild_id, size_t len) +{ + size_t i; + + for (i = 0; i < len; i++) { + if (!isxdigit(maybe_sbuild_id[i])) + return false; + } + return true; +} + +/* Return the valid complete build-id */ +char *build_id_cache__complement(const char *incomplete_sbuild_id) +{ + struct strlist *bidlist; + struct str_node *nd, *cand = NULL; + char *sbuild_id = NULL; + size_t len = strlen(incomplete_sbuild_id); + + if (len >= SBUILD_ID_SIZE || + !str_is_build_id(incomplete_sbuild_id, len)) + return NULL; + + bidlist = build_id_cache__list_all(true); + if (!bidlist) + return NULL; + + strlist__for_each_entry(nd, bidlist) { + if (strncmp(nd->s, incomplete_sbuild_id, len) != 0) + continue; + if (cand) { /* Error: There are more than 2 candidates. */ + cand = NULL; + break; + } + cand = nd; + } + if (cand) + sbuild_id = strdup(cand->s); + strlist__delete(bidlist); + + return sbuild_id; +} + +char *build_id_cache__cachedir(const char *sbuild_id, const char *name, + struct nsinfo *nsi, bool is_kallsyms, + bool is_vdso) +{ + char *realname = (char *)name, *filename; + bool slash = is_kallsyms || is_vdso; + + if (!slash) + realname = nsinfo__realpath(name, nsi); + + if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "", + is_vdso ? DSO__NAME_VDSO : (realname ? realname : name), + sbuild_id ? "/" : "", sbuild_id ?: "") < 0) + filename = NULL; + + if (!slash) + free(realname); + + return filename; +} + +int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi, + struct strlist **result) +{ + char *dir_name; + int ret = 0; + + dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false); + if (!dir_name) + return -ENOMEM; + + *result = lsdir(dir_name, lsdir_no_dot_filter); + if (!*result) + ret = -errno; + free(dir_name); + + return ret; +} + +#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT) +static int build_id_cache__add_sdt_cache(const char *sbuild_id, + const char *realname, + struct nsinfo *nsi) +{ + struct probe_cache *cache; + int ret; + struct nscookie nsc; + + cache = probe_cache__new(sbuild_id, nsi); + if (!cache) + return -1; + + nsinfo__mountns_enter(nsi, &nsc); + ret = probe_cache__scan_sdt(cache, realname); + nsinfo__mountns_exit(&nsc); + if (ret >= 0) { + pr_debug4("Found %d SDTs in %s\n", ret, realname); + if (probe_cache__commit(cache) < 0) + ret = -1; + } + probe_cache__delete(cache); + return ret; +} +#else +#define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0) +#endif + +static char *build_id_cache__find_debug(const char *sbuild_id, + struct nsinfo *nsi, + const char *root_dir) +{ + const char *dirname = "/usr/lib/debug/.build-id/"; + char *realname = NULL; + char dirbuf[PATH_MAX]; + char *debugfile; + struct nscookie nsc; + size_t len = 0; + + debugfile = calloc(1, PATH_MAX); + if (!debugfile) + goto out; + + if (root_dir) { + path__join(dirbuf, PATH_MAX, root_dir, dirname); + dirname = dirbuf; + } + + len = __symbol__join_symfs(debugfile, PATH_MAX, dirname); + snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id, + sbuild_id + 2); + + nsinfo__mountns_enter(nsi, &nsc); + realname = realpath(debugfile, NULL); + if (realname && access(realname, R_OK)) + zfree(&realname); + nsinfo__mountns_exit(&nsc); + +#ifdef HAVE_DEBUGINFOD_SUPPORT + if (realname == NULL) { + debuginfod_client* c; + + pr_debug("Downloading debug info with build id %s\n", sbuild_id); + + c = debuginfod_begin(); + if (c != NULL) { + int fd = debuginfod_find_debuginfo(c, + (const unsigned char*)sbuild_id, 0, + &realname); + if (fd >= 0) + close(fd); /* retaining reference by realname */ + debuginfod_end(c); + } + } +#endif + +out: + free(debugfile); + return realname; +} + +int +build_id_cache__add(const char *sbuild_id, const char *name, const char *realname, + struct nsinfo *nsi, bool is_kallsyms, bool is_vdso, + const char *proper_name, const char *root_dir) +{ + const size_t size = PATH_MAX; + char *filename = NULL, *dir_name = NULL, *linkname = zalloc(size), *tmp; + char *debugfile = NULL; + int err = -1; + + if (!proper_name) + proper_name = name; + + dir_name = build_id_cache__cachedir(sbuild_id, proper_name, nsi, is_kallsyms, + is_vdso); + if (!dir_name) + goto out_free; + + /* Remove old style build-id cache */ + if (is_regular_file(dir_name)) + if (unlink(dir_name)) + goto out_free; + + if (mkdir_p(dir_name, 0755)) + goto out_free; + + /* Save the allocated buildid dirname */ + if (asprintf(&filename, "%s/%s", dir_name, + build_id_cache__basename(is_kallsyms, is_vdso, + false)) < 0) { + filename = NULL; + goto out_free; + } + + if (access(filename, F_OK)) { + if (is_kallsyms) { + if (copyfile("/proc/kallsyms", filename)) + goto out_free; + } else if (nsi && nsinfo__need_setns(nsi)) { + if (copyfile_ns(name, filename, nsi)) + goto out_free; + } else if (link(realname, filename) && errno != EEXIST) { + struct stat f_stat; + + if (!(stat(name, &f_stat) < 0) && + copyfile_mode(name, filename, f_stat.st_mode)) + goto out_free; + } + } + + /* Some binaries are stripped, but have .debug files with their symbol + * table. Check to see if we can locate one of those, since the elf + * file itself may not be very useful to users of our tools without a + * symtab. + */ + if (!is_kallsyms && !is_vdso && + strncmp(".ko", name + strlen(name) - 3, 3)) { + debugfile = build_id_cache__find_debug(sbuild_id, nsi, root_dir); + if (debugfile) { + zfree(&filename); + if (asprintf(&filename, "%s/%s", dir_name, + build_id_cache__basename(false, false, true)) < 0) { + filename = NULL; + goto out_free; + } + if (access(filename, F_OK)) { + if (nsi && nsinfo__need_setns(nsi)) { + if (copyfile_ns(debugfile, filename, + nsi)) + goto out_free; + } else if (link(debugfile, filename) && + errno != EEXIST && + copyfile(debugfile, filename)) + goto out_free; + } + } + } + + if (!build_id_cache__linkname(sbuild_id, linkname, size)) + goto out_free; + tmp = strrchr(linkname, '/'); + *tmp = '\0'; + + if (access(linkname, X_OK) && mkdir_p(linkname, 0755)) + goto out_free; + + *tmp = '/'; + tmp = dir_name + strlen(buildid_dir) - 5; + memcpy(tmp, "../..", 5); + + if (symlink(tmp, linkname) == 0) { + err = 0; + } else if (errno == EEXIST) { + char path[PATH_MAX]; + ssize_t len; + + len = readlink(linkname, path, sizeof(path) - 1); + if (len <= 0) { + pr_err("Can't read link: %s\n", linkname); + goto out_free; + } + path[len] = '\0'; + + if (strcmp(tmp, path)) { + pr_debug("build <%s> already linked to %s\n", + sbuild_id, linkname); + } + err = 0; + } + + /* Update SDT cache : error is just warned */ + if (realname && + build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0) + pr_debug4("Failed to update/scan SDT cache for %s\n", realname); + +out_free: + free(filename); + free(debugfile); + free(dir_name); + free(linkname); + return err; +} + +int __build_id_cache__add_s(const char *sbuild_id, const char *name, + struct nsinfo *nsi, bool is_kallsyms, bool is_vdso, + const char *proper_name, const char *root_dir) +{ + char *realname = NULL; + int err = -1; + + if (!is_kallsyms) { + if (!is_vdso) + realname = nsinfo__realpath(name, nsi); + else + realname = realpath(name, NULL); + if (!realname) + goto out_free; + } + + err = build_id_cache__add(sbuild_id, name, realname, nsi, + is_kallsyms, is_vdso, proper_name, root_dir); +out_free: + if (!is_kallsyms) + free(realname); + return err; +} + +static int build_id_cache__add_b(const struct build_id *bid, + const char *name, struct nsinfo *nsi, + bool is_kallsyms, bool is_vdso, + const char *proper_name, + const char *root_dir) +{ + char sbuild_id[SBUILD_ID_SIZE]; + + build_id__sprintf(bid, sbuild_id); + + return __build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms, + is_vdso, proper_name, root_dir); +} + +bool build_id_cache__cached(const char *sbuild_id) +{ + bool ret = false; + char *filename = build_id_cache__linkname(sbuild_id, NULL, 0); + + if (filename && !access(filename, F_OK)) + ret = true; + free(filename); + + return ret; +} + +int build_id_cache__remove_s(const char *sbuild_id) +{ + const size_t size = PATH_MAX; + char *filename = zalloc(size), + *linkname = zalloc(size), *tmp; + int err = -1; + + if (filename == NULL || linkname == NULL) + goto out_free; + + if (!build_id_cache__linkname(sbuild_id, linkname, size)) + goto out_free; + + if (access(linkname, F_OK)) + goto out_free; + + if (readlink(linkname, filename, size - 1) < 0) + goto out_free; + + if (unlink(linkname)) + goto out_free; + + /* + * Since the link is relative, we must make it absolute: + */ + tmp = strrchr(linkname, '/') + 1; + snprintf(tmp, size - (tmp - linkname), "%s", filename); + + if (rm_rf(linkname)) + goto out_free; + + err = 0; +out_free: + free(filename); + free(linkname); + return err; +} + +static int filename__read_build_id_ns(const char *filename, + struct build_id *bid, + struct nsinfo *nsi) +{ + struct nscookie nsc; + int ret; + + nsinfo__mountns_enter(nsi, &nsc); + ret = filename__read_build_id(filename, bid); + nsinfo__mountns_exit(&nsc); + + return ret; +} + +static bool dso__build_id_mismatch(struct dso *dso, const char *name) +{ + struct build_id bid; + bool ret = false; + + mutex_lock(&dso->lock); + if (filename__read_build_id_ns(name, &bid, dso->nsinfo) >= 0) + ret = !dso__build_id_equal(dso, &bid); + + mutex_unlock(&dso->lock); + + return ret; +} + +static int dso__cache_build_id(struct dso *dso, struct machine *machine, + void *priv __maybe_unused) +{ + bool is_kallsyms = dso__is_kallsyms(dso); + bool is_vdso = dso__is_vdso(dso); + const char *name = dso->long_name; + const char *proper_name = NULL; + const char *root_dir = NULL; + char *allocated_name = NULL; + int ret = 0; + + if (!dso->has_build_id) + return 0; + + if (dso__is_kcore(dso)) { + is_kallsyms = true; + name = machine->mmap_name; + } + + if (!machine__is_host(machine)) { + if (*machine->root_dir) { + root_dir = machine->root_dir; + ret = asprintf(&allocated_name, "%s/%s", root_dir, name); + if (ret < 0) + return ret; + proper_name = name; + name = allocated_name; + } else if (is_kallsyms) { + /* Cannot get guest kallsyms */ + return 0; + } + } + + if (!is_kallsyms && dso__build_id_mismatch(dso, name)) + goto out_free; + + mutex_lock(&dso->lock); + ret = build_id_cache__add_b(&dso->bid, name, dso->nsinfo, + is_kallsyms, is_vdso, proper_name, root_dir); + mutex_unlock(&dso->lock); +out_free: + free(allocated_name); + return ret; +} + +static int +machines__for_each_dso(struct machines *machines, machine__dso_t fn, void *priv) +{ + int ret = machine__for_each_dso(&machines->host, fn, priv); + struct rb_node *nd; + + for (nd = rb_first_cached(&machines->guests); nd; + nd = rb_next(nd)) { + struct machine *pos = rb_entry(nd, struct machine, rb_node); + + ret |= machine__for_each_dso(pos, fn, priv); + } + return ret ? -1 : 0; +} + +int __perf_session__cache_build_ids(struct perf_session *session, + machine__dso_t fn, void *priv) +{ + if (no_buildid_cache) + return 0; + + if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST) + return -1; + + return machines__for_each_dso(&session->machines, fn, priv) ? -1 : 0; +} + +int perf_session__cache_build_ids(struct perf_session *session) +{ + return __perf_session__cache_build_ids(session, dso__cache_build_id, NULL); +} + +static bool machine__read_build_ids(struct machine *machine, bool with_hits) +{ + return __dsos__read_build_ids(&machine->dsos.head, with_hits); +} + +bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) +{ + struct rb_node *nd; + bool ret = machine__read_build_ids(&session->machines.host, with_hits); + + for (nd = rb_first_cached(&session->machines.guests); nd; + nd = rb_next(nd)) { + struct machine *pos = rb_entry(nd, struct machine, rb_node); + ret |= machine__read_build_ids(pos, with_hits); + } + + return ret; +} + +void build_id__init(struct build_id *bid, const u8 *data, size_t size) +{ + WARN_ON(size > BUILD_ID_SIZE); + memcpy(bid->data, data, size); + bid->size = size; +} + +bool build_id__is_defined(const struct build_id *bid) +{ + return bid && bid->size ? !!memchr_inv(bid->data, 0, bid->size) : false; +} -- cgit v1.2.3