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kernel/trace/trace_event_perf.c
12 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* trace event based perf event profiling/tracing |
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* |
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* Copyright (C) 2009 Red Hat Inc, Peter Zijlstra |
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* Copyright (C) 2009-2010 Frederic Weisbecker <fweisbec@gmail.com> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kprobes.h> |
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#include <linux/security.h> |
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#include "trace.h" |
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#include "trace_probe.h" |
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|
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static char __percpu *perf_trace_buf[PERF_NR_CONTEXTS]; |
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|
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/* * Force it to be aligned to unsigned long to avoid misaligned accesses * suprises */ typedef typeof(unsigned long [PERF_MAX_TRACE_SIZE / sizeof(unsigned long)]) perf_trace_t; |
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|
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/* Count the events in use (per event id, not per instance) */ |
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static int total_ref_count; |
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|
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static int perf_trace_event_perm(struct trace_event_call *tp_event, |
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struct perf_event *p_event) { |
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int ret; |
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if (tp_event->perf_perm) { |
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ret = tp_event->perf_perm(tp_event, p_event); |
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if (ret) return ret; } |
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/* * We checked and allowed to create parent, * allow children without checking. */ if (p_event->parent) return 0; /* * It's ok to check current process (owner) permissions in here, * because code below is called only via perf_event_open syscall. */ |
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/* The ftrace function trace is allowed only for root. */ |
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if (ftrace_event_is_function(tp_event)) { |
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ret = perf_allow_tracepoint(&p_event->attr); if (ret) return ret; |
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|
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if (!is_sampling_event(p_event)) return 0; |
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/* * We don't allow user space callchains for function trace * event, due to issues with page faults while tracing page * fault handler and its overall trickiness nature. */ if (!p_event->attr.exclude_callchain_user) return -EINVAL; |
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/* * Same reason to disable user stack dump as for user space * callchains above. */ if (p_event->attr.sample_type & PERF_SAMPLE_STACK_USER) return -EINVAL; |
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} |
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|
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/* No tracing, just counting, so no obvious leak */ if (!(p_event->attr.sample_type & PERF_SAMPLE_RAW)) return 0; /* Some events are ok to be traced by non-root users... */ if (p_event->attach_state == PERF_ATTACH_TASK) { if (tp_event->flags & TRACE_EVENT_FL_CAP_ANY) return 0; } /* * ...otherwise raw tracepoint data can be a severe data leak, * only allow root to have these. */ |
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ret = perf_allow_tracepoint(&p_event->attr); if (ret) return ret; |
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return 0; } |
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static int perf_trace_event_reg(struct trace_event_call *tp_event, |
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struct perf_event *p_event) |
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{ |
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struct hlist_head __percpu *list; |
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int ret = -ENOMEM; |
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int cpu; |
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|
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p_event->tp_event = tp_event; if (tp_event->perf_refcount++ > 0) |
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return 0; |
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list = alloc_percpu(struct hlist_head); if (!list) goto fail; for_each_possible_cpu(cpu) INIT_HLIST_HEAD(per_cpu_ptr(list, cpu)); |
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|
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tp_event->perf_events = list; |
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|
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if (!total_ref_count) { |
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char __percpu *buf; |
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int i; |
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|
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for (i = 0; i < PERF_NR_CONTEXTS; i++) { |
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buf = (char __percpu *)alloc_percpu(perf_trace_t); |
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if (!buf) |
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goto fail; |
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|
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perf_trace_buf[i] = buf; |
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} |
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} |
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ret = tp_event->class->reg(tp_event, TRACE_REG_PERF_REGISTER, NULL); |
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if (ret) goto fail; |
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|
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total_ref_count++; return 0; fail: |
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if (!total_ref_count) { |
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int i; |
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for (i = 0; i < PERF_NR_CONTEXTS; i++) { |
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free_percpu(perf_trace_buf[i]); perf_trace_buf[i] = NULL; } |
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} |
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if (!--tp_event->perf_refcount) { free_percpu(tp_event->perf_events); tp_event->perf_events = NULL; |
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} |
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return ret; |
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} |
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static void perf_trace_event_unreg(struct perf_event *p_event) { |
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struct trace_event_call *tp_event = p_event->tp_event; |
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int i; if (--tp_event->perf_refcount > 0) goto out; tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER, NULL); /* * Ensure our callback won't be called anymore. The buffers * will be freed after that. */ tracepoint_synchronize_unregister(); free_percpu(tp_event->perf_events); tp_event->perf_events = NULL; if (!--total_ref_count) { for (i = 0; i < PERF_NR_CONTEXTS; i++) { free_percpu(perf_trace_buf[i]); perf_trace_buf[i] = NULL; } } out: module_put(tp_event->mod); } static int perf_trace_event_open(struct perf_event *p_event) { |
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struct trace_event_call *tp_event = p_event->tp_event; |
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return tp_event->class->reg(tp_event, TRACE_REG_PERF_OPEN, p_event); } static void perf_trace_event_close(struct perf_event *p_event) { |
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struct trace_event_call *tp_event = p_event->tp_event; |
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tp_event->class->reg(tp_event, TRACE_REG_PERF_CLOSE, p_event); } |
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static int perf_trace_event_init(struct trace_event_call *tp_event, |
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struct perf_event *p_event) { int ret; ret = perf_trace_event_perm(tp_event, p_event); if (ret) return ret; ret = perf_trace_event_reg(tp_event, p_event); if (ret) return ret; ret = perf_trace_event_open(p_event); if (ret) { perf_trace_event_unreg(p_event); return ret; } return 0; } |
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int perf_trace_init(struct perf_event *p_event) |
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{ |
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struct trace_event_call *tp_event; |
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u64 event_id = p_event->attr.config; |
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int ret = -EINVAL; |
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|
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mutex_lock(&event_mutex); |
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list_for_each_entry(tp_event, &ftrace_events, list) { |
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if (tp_event->event.type == event_id && |
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tp_event->class && tp_event->class->reg && |
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try_module_get(tp_event->mod)) { ret = perf_trace_event_init(tp_event, p_event); |
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if (ret) module_put(tp_event->mod); |
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break; } |
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} |
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mutex_unlock(&event_mutex); |
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|
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return ret; |
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} |
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void perf_trace_destroy(struct perf_event *p_event) { mutex_lock(&event_mutex); perf_trace_event_close(p_event); perf_trace_event_unreg(p_event); mutex_unlock(&event_mutex); } |
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#ifdef CONFIG_KPROBE_EVENTS int perf_kprobe_init(struct perf_event *p_event, bool is_retprobe) { int ret; char *func = NULL; struct trace_event_call *tp_event; if (p_event->attr.kprobe_func) { func = kzalloc(KSYM_NAME_LEN, GFP_KERNEL); if (!func) return -ENOMEM; ret = strncpy_from_user( func, u64_to_user_ptr(p_event->attr.kprobe_func), KSYM_NAME_LEN); |
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if (ret == KSYM_NAME_LEN) ret = -E2BIG; |
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if (ret < 0) goto out; if (func[0] == '\0') { kfree(func); func = NULL; } } tp_event = create_local_trace_kprobe( func, (void *)(unsigned long)(p_event->attr.kprobe_addr), p_event->attr.probe_offset, is_retprobe); if (IS_ERR(tp_event)) { ret = PTR_ERR(tp_event); goto out; } |
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mutex_lock(&event_mutex); |
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ret = perf_trace_event_init(tp_event, p_event); if (ret) destroy_local_trace_kprobe(tp_event); |
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mutex_unlock(&event_mutex); |
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out: kfree(func); return ret; } void perf_kprobe_destroy(struct perf_event *p_event) { |
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mutex_lock(&event_mutex); |
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perf_trace_event_close(p_event); perf_trace_event_unreg(p_event); |
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mutex_unlock(&event_mutex); |
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destroy_local_trace_kprobe(p_event->tp_event); } #endif /* CONFIG_KPROBE_EVENTS */ |
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#ifdef CONFIG_UPROBE_EVENTS |
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int perf_uprobe_init(struct perf_event *p_event, unsigned long ref_ctr_offset, bool is_retprobe) |
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{ int ret; char *path = NULL; struct trace_event_call *tp_event; if (!p_event->attr.uprobe_path) return -EINVAL; |
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path = strndup_user(u64_to_user_ptr(p_event->attr.uprobe_path), PATH_MAX); if (IS_ERR(path)) { ret = PTR_ERR(path); return (ret == -EINVAL) ? -E2BIG : ret; } |
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if (path[0] == '\0') { ret = -EINVAL; goto out; } |
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tp_event = create_local_trace_uprobe(path, p_event->attr.probe_offset, ref_ctr_offset, is_retprobe); |
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if (IS_ERR(tp_event)) { ret = PTR_ERR(tp_event); goto out; } /* * local trace_uprobe need to hold event_mutex to call * uprobe_buffer_enable() and uprobe_buffer_disable(). * event_mutex is not required for local trace_kprobes. */ mutex_lock(&event_mutex); ret = perf_trace_event_init(tp_event, p_event); if (ret) destroy_local_trace_uprobe(tp_event); mutex_unlock(&event_mutex); out: kfree(path); return ret; } void perf_uprobe_destroy(struct perf_event *p_event) { mutex_lock(&event_mutex); perf_trace_event_close(p_event); perf_trace_event_unreg(p_event); mutex_unlock(&event_mutex); destroy_local_trace_uprobe(p_event->tp_event); } #endif /* CONFIG_UPROBE_EVENTS */ |
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int perf_trace_add(struct perf_event *p_event, int flags) |
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{ |
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struct trace_event_call *tp_event = p_event->tp_event; |
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|
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if (!(flags & PERF_EF_START)) p_event->hw.state = PERF_HES_STOPPED; |
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/* * If TRACE_REG_PERF_ADD returns false; no custom action was performed * and we need to take the default action of enqueueing our event on * the right per-cpu hlist. */ if (!tp_event->class->reg(tp_event, TRACE_REG_PERF_ADD, p_event)) { struct hlist_head __percpu *pcpu_list; struct hlist_head *list; pcpu_list = tp_event->perf_events; if (WARN_ON_ONCE(!pcpu_list)) return -EINVAL; list = this_cpu_ptr(pcpu_list); hlist_add_head_rcu(&p_event->hlist_entry, list); } |
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|
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return 0; |
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} |
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|
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void perf_trace_del(struct perf_event *p_event, int flags) |
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{ |
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struct trace_event_call *tp_event = p_event->tp_event; |
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/* * If TRACE_REG_PERF_DEL returns false; no custom action was performed * and we need to take the default action of dequeueing our event from * the right per-cpu hlist. */ if (!tp_event->class->reg(tp_event, TRACE_REG_PERF_DEL, p_event)) hlist_del_rcu(&p_event->hlist_entry); |
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} |
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void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp) |
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{ |
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char *raw_data; |
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int rctx; |
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|
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BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(unsigned long)); |
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if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
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"perf buffer not large enough")) |
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return NULL; |
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*rctxp = rctx = perf_swevent_get_recursion_context(); if (rctx < 0) |
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return NULL; |
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|
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if (regs) |
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*regs = this_cpu_ptr(&__perf_regs[rctx]); raw_data = this_cpu_ptr(perf_trace_buf[rctx]); |
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/* zero the dead bytes from align to not leak stack to user */ |
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memset(&raw_data[size - sizeof(u64)], 0, sizeof(u64)); |
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return raw_data; } EXPORT_SYMBOL_GPL(perf_trace_buf_alloc); NOKPROBE_SYMBOL(perf_trace_buf_alloc); void perf_trace_buf_update(void *record, u16 type) { struct trace_entry *entry = record; int pc = preempt_count(); unsigned long flags; |
430ad5a60 perf: Factorize t... |
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|
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local_save_flags(flags); |
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tracing_generic_entry_update(entry, type, flags, pc); |
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} |
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NOKPROBE_SYMBOL(perf_trace_buf_update); |
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#ifdef CONFIG_FUNCTION_TRACER static void |
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perf_ftrace_function_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d1 ftrace: Return pt... |
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struct ftrace_ops *ops, struct pt_regs *pt_regs) |
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{ struct ftrace_entry *entry; |
466c81c45 perf/ftrace: Fix ... |
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struct perf_event *event; struct hlist_head head; |
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struct pt_regs regs; int rctx; |
466c81c45 perf/ftrace: Fix ... |
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if ((unsigned long)ops->private != smp_processor_id()) |
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return; |
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event = container_of(ops, struct perf_event, ftrace_ops); /* * @event->hlist entry is NULL (per INIT_HLIST_NODE), and all * the perf code does is hlist_for_each_entry_rcu(), so we can * get away with simply setting the @head.first pointer in order * to create a singular list. */ head.first = &event->hlist_entry; |
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#define ENTRY_SIZE (ALIGN(sizeof(struct ftrace_entry) + sizeof(u32), \ sizeof(u64)) - sizeof(u32)) BUILD_BUG_ON(ENTRY_SIZE > PERF_MAX_TRACE_SIZE); |
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memset(®s, 0, sizeof(regs)); |
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perf_fetch_caller_regs(®s); |
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entry = perf_trace_buf_alloc(ENTRY_SIZE, NULL, &rctx); |
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if (!entry) return; entry->ip = ip; entry->parent_ip = parent_ip; |
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perf_trace_buf_submit(entry, ENTRY_SIZE, rctx, TRACE_FN, |
466c81c45 perf/ftrace: Fix ... |
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1, ®s, &head, NULL); |
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#undef ENTRY_SIZE } static int perf_ftrace_function_register(struct perf_event *event) { struct ftrace_ops *ops = &event->ftrace_ops; |
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ops->flags = FTRACE_OPS_FL_RCU; |
466c81c45 perf/ftrace: Fix ... |
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ops->func = perf_ftrace_function_call; ops->private = (void *)(unsigned long)nr_cpu_ids; |
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return register_ftrace_function(ops); } static int perf_ftrace_function_unregister(struct perf_event *event) { struct ftrace_ops *ops = &event->ftrace_ops; |
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int ret = unregister_ftrace_function(ops); ftrace_free_filter(ops); return ret; |
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} |
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int perf_ftrace_event_register(struct trace_event_call *call, |
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enum trace_reg type, void *data) { |
466c81c45 perf/ftrace: Fix ... |
468 |
struct perf_event *event = data; |
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switch (type) { case TRACE_REG_REGISTER: case TRACE_REG_UNREGISTER: break; case TRACE_REG_PERF_REGISTER: case TRACE_REG_PERF_UNREGISTER: return 0; case TRACE_REG_PERF_OPEN: return perf_ftrace_function_register(data); case TRACE_REG_PERF_CLOSE: return perf_ftrace_function_unregister(data); case TRACE_REG_PERF_ADD: |
466c81c45 perf/ftrace: Fix ... |
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event->ftrace_ops.private = (void *)(unsigned long)smp_processor_id(); return 1; |
ced39002f ftrace, perf: Add... |
483 |
case TRACE_REG_PERF_DEL: |
466c81c45 perf/ftrace: Fix ... |
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event->ftrace_ops.private = (void *)(unsigned long)nr_cpu_ids; return 1; |
ced39002f ftrace, perf: Add... |
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} return -EINVAL; } #endif /* CONFIG_FUNCTION_TRACER */ |