94 lines
1.8 KiB
C
94 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Wenbo Zhang
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "hardirqs.h"
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#include "bits.bpf.h"
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#include "maps.bpf.h"
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#define MAX_ENTRIES 256
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const volatile bool targ_dist = false;
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const volatile bool targ_ns = false;
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__uint(max_entries, 1);
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__type(key, u32);
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__type(value, u64);
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} start SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__uint(max_entries, MAX_ENTRIES);
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__type(key, struct irq_key);
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__type(value, struct info);
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} infos SEC(".maps");
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static struct info zero;
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SEC("tracepoint/irq/irq_handler_entry")
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int handle__irq_handler(struct trace_event_raw_irq_handler_entry *ctx)
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{
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struct irq_key key = {};
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struct info *info;
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bpf_probe_read_kernel_str(&key.name, sizeof(key.name), ctx->__data);
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info = bpf_map_lookup_or_try_init(&infos, &key, &zero);
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if (!info)
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return 0;
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info->count += 1;
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return 0;
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}
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SEC("tp_btf/irq_handler_entry")
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int BPF_PROG(irq_handler_entry)
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{
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u64 ts = bpf_ktime_get_ns();
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u32 key = 0;
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bpf_map_update_elem(&start, &key, &ts, 0);
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return 0;
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}
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SEC("tp_btf/irq_handler_exit")
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int BPF_PROG(irq_handler_exit_exit, int irq, struct irqaction *action)
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{
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struct irq_key ikey = {};
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struct info *info;
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u32 key = 0;
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s64 delta;
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u64 *tsp;
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tsp = bpf_map_lookup_elem(&start, &key);
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if (!tsp || !*tsp)
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return 0;
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delta = bpf_ktime_get_ns() - *tsp;
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if (delta < 0)
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return 0;
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if (!targ_ns)
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delta /= 1000U;
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bpf_probe_read_kernel_str(&ikey.name, sizeof(ikey.name), action->name);
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info = bpf_map_lookup_or_try_init(&infos, &ikey, &zero);
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if (!info)
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return 0;
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if (!targ_dist) {
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info->count += delta;
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} else {
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u64 slot;
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slot = log2(delta);
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if (slot >= MAX_SLOTS)
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slot = MAX_SLOTS - 1;
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info->slots[slot]++;
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}
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return 0;
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}
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char LICENSE[] SEC("license") = "GPL";
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