From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- tools/perf/util/util.c | 559 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 559 insertions(+) create mode 100644 tools/perf/util/util.c (limited to 'tools/perf/util/util.c') diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c new file mode 100644 index 000000000..8f7cd32f5 --- /dev/null +++ b/tools/perf/util/util.c @@ -0,0 +1,559 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "perf.h" +#include "util.h" +#include "debug.h" +#include "event.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "cap.h" +#include "strlist.h" +#include "string2.h" + +/* + * XXX We need to find a better place for these things... + */ + +const char *input_name; + +bool perf_singlethreaded = true; + +void perf_set_singlethreaded(void) +{ + perf_singlethreaded = true; +} + +void perf_set_multithreaded(void) +{ + perf_singlethreaded = false; +} + +int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH; +int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK; + +int sysctl__max_stack(void) +{ + int value; + + if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0) + sysctl_perf_event_max_stack = value; + + if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0) + sysctl_perf_event_max_contexts_per_stack = value; + + return sysctl_perf_event_max_stack; +} + +bool sysctl__nmi_watchdog_enabled(void) +{ + static bool cached; + static bool nmi_watchdog; + int value; + + if (cached) + return nmi_watchdog; + + if (sysctl__read_int("kernel/nmi_watchdog", &value) < 0) + return false; + + nmi_watchdog = (value > 0) ? true : false; + cached = true; + + return nmi_watchdog; +} + +bool exclude_GH_default; + +bool perf_host = true; +bool perf_guest = false; + +void event_attr_init(struct perf_event_attr *attr) +{ + /* to capture ABI version */ + attr->size = sizeof(*attr); + + if (!exclude_GH_default) + return; + + if (!perf_host) + attr->exclude_host = 1; + if (!perf_guest) + attr->exclude_guest = 1; +} + +int mkdir_p(char *path, mode_t mode) +{ + struct stat st; + int err; + char *d = path; + + if (*d != '/') + return -1; + + if (stat(path, &st) == 0) + return 0; + + while (*++d == '/'); + + while ((d = strchr(d, '/'))) { + *d = '\0'; + err = stat(path, &st) && mkdir(path, mode); + *d++ = '/'; + if (err) + return -1; + while (*d == '/') + ++d; + } + return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0; +} + +static bool match_pat(char *file, const char **pat) +{ + int i = 0; + + if (!pat) + return true; + + while (pat[i]) { + if (strglobmatch(file, pat[i])) + return true; + + i++; + } + + return false; +} + +/* + * The depth specify how deep the removal will go. + * 0 - will remove only files under the 'path' directory + * 1 .. x - will dive in x-level deep under the 'path' directory + * + * If specified the pat is array of string patterns ended with NULL, + * which are checked upon every file/directory found. Only matching + * ones are removed. + * + * The function returns: + * 0 on success + * -1 on removal failure with errno set + * -2 on pattern failure + */ +static int rm_rf_depth_pat(const char *path, int depth, const char **pat) +{ + DIR *dir; + int ret; + struct dirent *d; + char namebuf[PATH_MAX]; + struct stat statbuf; + + /* Do not fail if there's no file. */ + ret = lstat(path, &statbuf); + if (ret) + return 0; + + /* Try to remove any file we get. */ + if (!(statbuf.st_mode & S_IFDIR)) + return unlink(path); + + /* We have directory in path. */ + dir = opendir(path); + if (dir == NULL) + return -1; + + while ((d = readdir(dir)) != NULL && !ret) { + + if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) + continue; + + if (!match_pat(d->d_name, pat)) { + ret = -2; + break; + } + + scnprintf(namebuf, sizeof(namebuf), "%s/%s", + path, d->d_name); + + /* We have to check symbolic link itself */ + ret = lstat(namebuf, &statbuf); + if (ret < 0) { + pr_debug("stat failed: %s\n", namebuf); + break; + } + + if (S_ISDIR(statbuf.st_mode)) + ret = depth ? rm_rf_depth_pat(namebuf, depth - 1, pat) : 0; + else + ret = unlink(namebuf); + } + closedir(dir); + + if (ret < 0) + return ret; + + return rmdir(path); +} + +static int rm_rf_a_kcore_dir(const char *path, const char *name) +{ + char kcore_dir_path[PATH_MAX]; + const char *pat[] = { + "kcore", + "kallsyms", + "modules", + NULL, + }; + + snprintf(kcore_dir_path, sizeof(kcore_dir_path), "%s/%s", path, name); + + return rm_rf_depth_pat(kcore_dir_path, 0, pat); +} + +static bool kcore_dir_filter(const char *name __maybe_unused, struct dirent *d) +{ + const char *pat[] = { + "kcore_dir", + "kcore_dir__[1-9]*", + NULL, + }; + + return match_pat(d->d_name, pat); +} + +static int rm_rf_kcore_dir(const char *path) +{ + struct strlist *kcore_dirs; + struct str_node *nd; + int ret; + + kcore_dirs = lsdir(path, kcore_dir_filter); + + if (!kcore_dirs) + return 0; + + strlist__for_each_entry(nd, kcore_dirs) { + ret = rm_rf_a_kcore_dir(path, nd->s); + if (ret) + return ret; + } + + strlist__delete(kcore_dirs); + + return 0; +} + +void cpumask_to_cpulist(char *cpumask, char *cpulist) +{ + int i, j, bm_size, nbits; + int len = strlen(cpumask); + unsigned long *bm; + char cpus[MAX_NR_CPUS]; + + for (i = 0; i < len; i++) { + if (cpumask[i] == ',') { + for (j = i; j < len; j++) + cpumask[j] = cpumask[j + 1]; + } + } + + len = strlen(cpumask); + bm_size = (len + 15) / 16; + nbits = bm_size * 64; + if (nbits <= 0) + return; + + bm = calloc(bm_size, sizeof(unsigned long)); + if (!bm) + goto free_bm; + + for (i = 0; i < bm_size; i++) { + char blk[17]; + int blklen = len > 16 ? 16 : len; + + strncpy(blk, cpumask + len - blklen, blklen); + blk[blklen] = '\0'; + bm[i] = strtoul(blk, NULL, 16); + cpumask[len - blklen] = '\0'; + len = strlen(cpumask); + } + + bitmap_scnprintf(bm, nbits, cpus, sizeof(cpus)); + strcpy(cpulist, cpus); + +free_bm: + free(bm); +} + +void print_separator2(int pre_dash_cnt, const char *s, int post_dash_cnt) +{ + printf("%.*s%s%.*s\n", pre_dash_cnt, graph_dotted_line, s, post_dash_cnt, + graph_dotted_line); +} + +int rm_rf_perf_data(const char *path) +{ + const char *pat[] = { + "data", + "data.*", + NULL, + }; + + rm_rf_kcore_dir(path); + + return rm_rf_depth_pat(path, 0, pat); +} + +int rm_rf(const char *path) +{ + return rm_rf_depth_pat(path, INT_MAX, NULL); +} + +/* A filter which removes dot files */ +bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d) +{ + return d->d_name[0] != '.'; +} + +/* lsdir reads a directory and store it in strlist */ +struct strlist *lsdir(const char *name, + bool (*filter)(const char *, struct dirent *)) +{ + struct strlist *list = NULL; + DIR *dir; + struct dirent *d; + + dir = opendir(name); + if (!dir) + return NULL; + + list = strlist__new(NULL, NULL); + if (!list) { + errno = ENOMEM; + goto out; + } + + while ((d = readdir(dir)) != NULL) { + if (!filter || filter(name, d)) + strlist__add(list, d->d_name); + } + +out: + closedir(dir); + return list; +} + +size_t hex_width(u64 v) +{ + size_t n = 1; + + while ((v >>= 4)) + ++n; + + return n; +} + +int perf_event_paranoid(void) +{ + int value; + + if (sysctl__read_int("kernel/perf_event_paranoid", &value)) + return INT_MAX; + + return value; +} + +bool perf_event_paranoid_check(int max_level) +{ + return perf_cap__capable(CAP_SYS_ADMIN) || + perf_cap__capable(CAP_PERFMON) || + perf_event_paranoid() <= max_level; +} + +int perf_tip(char **strp, const char *dirpath) +{ + struct strlist *tips; + struct str_node *node; + struct strlist_config conf = { + .dirname = dirpath, + .file_only = true, + }; + int ret = 0; + + *strp = NULL; + tips = strlist__new("tips.txt", &conf); + if (tips == NULL) + return -errno; + + if (strlist__nr_entries(tips) == 0) + goto out; + + node = strlist__entry(tips, random() % strlist__nr_entries(tips)); + if (asprintf(strp, "Tip: %s", node->s) < 0) + ret = -ENOMEM; + +out: + strlist__delete(tips); + + return ret; +} + +char *perf_exe(char *buf, int len) +{ + int n; + + if (len <= 0) + return buf; + + n = readlink("/proc/self/exe", buf, len - 1); + if (n > 0) { + buf[n] = 0; + return buf; + } + if (len < (int)sizeof("perf")) { + buf[0] = '\0'; + return buf; + } + + return strcpy(buf, "perf"); +} + +void perf_debuginfod_setup(struct perf_debuginfod *di) +{ + /* + * By default '!di->set' we clear DEBUGINFOD_URLS, so debuginfod + * processing is not triggered, otherwise we set it to 'di->urls' + * value. If 'di->urls' is "system" we keep DEBUGINFOD_URLS value. + */ + if (!di->set) + setenv("DEBUGINFOD_URLS", "", 1); + else if (di->urls && strcmp(di->urls, "system")) + setenv("DEBUGINFOD_URLS", di->urls, 1); + + pr_debug("DEBUGINFOD_URLS=%s\n", getenv("DEBUGINFOD_URLS")); + +#ifndef HAVE_DEBUGINFOD_SUPPORT + if (di->set) + pr_warning("WARNING: debuginfod support requested, but perf is not built with it\n"); +#endif +} + +/* + * Return a new filename prepended with task's root directory if it's in + * a chroot. Callers should free the returned string. + */ +char *filename_with_chroot(int pid, const char *filename) +{ + char buf[PATH_MAX]; + char proc_root[32]; + char *new_name = NULL; + int ret; + + scnprintf(proc_root, sizeof(proc_root), "/proc/%d/root", pid); + ret = readlink(proc_root, buf, sizeof(buf) - 1); + if (ret <= 0) + return NULL; + + /* readlink(2) does not append a null byte to buf */ + buf[ret] = '\0'; + + if (!strcmp(buf, "/")) + return NULL; + + if (strstr(buf, "(deleted)")) + return NULL; + + if (asprintf(&new_name, "%s/%s", buf, filename) < 0) + return NULL; + + return new_name; +} + +/* + * Reallocate an array *arr of size *arr_sz so that it is big enough to contain + * x elements of size msz, initializing new entries to *init_val or zero if + * init_val is NULL + */ +int do_realloc_array_as_needed(void **arr, size_t *arr_sz, size_t x, size_t msz, const void *init_val) +{ + size_t new_sz = *arr_sz; + void *new_arr; + size_t i; + + if (!new_sz) + new_sz = msz >= 64 ? 1 : roundup(64, msz); /* Start with at least 64 bytes */ + while (x >= new_sz) { + if (check_mul_overflow(new_sz, (size_t)2, &new_sz)) + return -ENOMEM; + } + if (new_sz == *arr_sz) + return 0; + new_arr = calloc(new_sz, msz); + if (!new_arr) + return -ENOMEM; + if (*arr_sz) + memcpy(new_arr, *arr, *arr_sz * msz); + if (init_val) { + for (i = *arr_sz; i < new_sz; i++) + memcpy(new_arr + (i * msz), init_val, msz); + } + *arr = new_arr; + *arr_sz = new_sz; + return 0; +} + +#ifndef HAVE_SCHED_GETCPU_SUPPORT +int sched_getcpu(void) +{ +#ifdef __NR_getcpu + unsigned int cpu; + int err = syscall(__NR_getcpu, &cpu, NULL, NULL); + + if (!err) + return cpu; +#else + errno = ENOSYS; +#endif + return -1; +} +#endif + +#ifndef HAVE_SCANDIRAT_SUPPORT +int scandirat(int dirfd, const char *dirp, + struct dirent ***namelist, + int (*filter)(const struct dirent *), + int (*compar)(const struct dirent **, const struct dirent **)) +{ + char path[PATH_MAX]; + int err, fd = openat(dirfd, dirp, O_PATH); + + if (fd < 0) + return fd; + + snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd); + err = scandir(path, namelist, filter, compar); + close(fd); + return err; +} +#endif + +/* basename version that takes a const input string */ +const char *perf_basename(const char *path) +{ + const char *base = strrchr(path, '/'); + + return base ? base + 1 : path; +} -- cgit v1.3.1