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Add blkalgn support to trace block I/Os and report Granularity and Alignment. Signed-off-by: Daniel Gomez <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 | ||
| /* Copyright (c) 2024 Samsung */ | ||
| #include "vmlinux.h" | ||
| #include <bpf/bpf_helpers.h> | ||
| #include <bpf/bpf_tracing.h> | ||
| #include <bpf/bpf_core_read.h> | ||
| #include "blkalgn.h" | ||
| #include "bits.bpf.h" | ||
| #include "core_fixes.bpf.h" | ||
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| const volatile bool filter_dev = false; | ||
| const volatile __u32 targ_dev = 0; | ||
| const volatile bool filter_ops = false; | ||
| const volatile __u32 targ_ops = 0; | ||
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| extern __u32 LINUX_KERNEL_VERSION __kconfig; | ||
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| char LICENSE[] SEC("license") = "Dual BSD/GPL"; | ||
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| struct { | ||
| __uint(type, BPF_MAP_TYPE_RINGBUF); | ||
| __uint(max_entries, 2097152); | ||
| } rb SEC(".maps"); | ||
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| struct { | ||
| __uint(type, BPF_MAP_TYPE_HASH); | ||
| __uint(max_entries, 10240); | ||
| __type(key, struct hkey); | ||
| __type(value, struct hval); | ||
| } halgn_map SEC(".maps"); | ||
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| struct { | ||
| __uint(type, BPF_MAP_TYPE_HASH); | ||
| __uint(max_entries, 10240); | ||
| __type(key, struct hkey); | ||
| __type(value, struct hval); | ||
| } hgran_map SEC(".maps"); | ||
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| static int __always_inline trace_rq_issue(struct request *rq) | ||
| { | ||
| struct event *e; | ||
| u32 dev; | ||
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| struct gendisk *disk = get_disk(rq); | ||
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| dev = disk ? MKDEV(BPF_CORE_READ(disk, major), | ||
| BPF_CORE_READ(disk, first_minor)) : | ||
| 0; | ||
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| if (filter_dev && targ_dev != dev) | ||
| return 0; | ||
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| if (filter_ops && targ_ops != (rq->cmd_flags & 0xff)) | ||
| return 0; | ||
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| e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); | ||
| if (!e) | ||
| return 0; | ||
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| bpf_get_current_comm(&e->comm, sizeof(e->comm)); | ||
| bpf_probe_read_kernel(&e->disk, sizeof(e->disk), | ||
| rq->q->disk->disk_name); | ||
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| e->flags = rq->cmd_flags; | ||
| e->lbs = rq->q->limits.logical_block_size; | ||
| e->len = rq->__data_len; | ||
| e->sector = rq->__sector; | ||
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| bpf_ringbuf_submit(e, 0); | ||
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| return 0; | ||
| } | ||
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| SEC("tp_btf/block_rq_issue") | ||
| int BPF_PROG(block_rq_issue) | ||
| { | ||
| /* | ||
| * Commit a54895fa (v5.11-rc1) changed tracepoint argument list | ||
| * from TP_PROTO(struct request_queue *q, struct request *rq) | ||
| * to TP_PROTO(struct request *rq) | ||
| */ | ||
| if (LINUX_KERNEL_VERSION >= KERNEL_VERSION(5, 11, 0)) | ||
| return trace_rq_issue((void *)ctx[0]); | ||
| else | ||
| return trace_rq_issue((void *)ctx[1]); | ||
| } |
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