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[76.126.33.191]) by smtp.gmail.com with ESMTPSA id n7-20020a63f807000000b005b529d633b7sm7894060pgh.14.2023.12.04.12.14.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Dec 2023 12:14:24 -0800 (PST) From: Kyle Huey X-Google-Original-From: Kyle Huey To: Kyle Huey , linux-kernel@vger.kernel.org Cc: Robert O'Callahan , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Ian Rogers , Adrian Hunter , linux-perf-users@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH 1/2] perf/bpf: Allow a bpf program to suppress I/O signals. Date: Mon, 4 Dec 2023 12:14:05 -0800 Message-Id: <20231204201406.341074-2-khuey@kylehuey.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231204201406.341074-1-khuey@kylehuey.com> References: <20231204201406.341074-1-khuey@kylehuey.com> MIME-Version: 1.0 X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (agentk.vger.email [0.0.0.0]); Mon, 04 Dec 2023 12:14:44 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784384036582082495 X-GMAIL-MSGID: 1784384036582082495 Returning zero from a bpf program attached to a perf event already suppresses any data output. This allows it to suppress I/O availability signals too. Signed-off-by: Kyle Huey Acked-by: Jiri Olsa --- kernel/events/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index b704d83a28b2..34d7b19d45eb 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -10417,8 +10417,10 @@ static void bpf_overflow_handler(struct perf_event *event, rcu_read_unlock(); out: __this_cpu_dec(bpf_prog_active); - if (!ret) + if (!ret) { + event->pending_kill = 0; return; + } event->orig_overflow_handler(event, data, regs); } From patchwork Mon Dec 4 20:14:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kyle Huey X-Patchwork-Id: 173551 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:bcd1:0:b0:403:3b70:6f57 with SMTP id r17csp3013204vqy; Mon, 4 Dec 2023 12:14:43 -0800 (PST) X-Google-Smtp-Source: AGHT+IFwR9gFX5ZMUMLkKOsmL7W+Or6VSrQRYaa7cqrY0M/IPkHyxZ01quQHTeNF9INdHX+ho9OR X-Received: by 2002:a05:6a20:914e:b0:18f:97c:9265 with SMTP id x14-20020a056a20914e00b0018f097c9265mr2203476pzc.74.1701720882905; Mon, 04 Dec 2023 12:14:42 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1701720882; cv=none; d=google.com; s=arc-20160816; b=YIBTYQq8yTnUbR0zAHoM73mYStoW+nHsHIBy/YD6iAZlN1XnmhFbqhVQrCqP901YCg jxZnN0moAxE0YZXtKmvtnKk+4v+QxVhGux0UZ2BK5TLO5nRXiMSTn/zu8YZAFxrkdDpG hnbjcf0kjKvKf2DwcPR0+f+iQpsxDb1F+nURSMWJX6llEQyDZ4hhOQ6aHXHDjGLJ3XDc /YKYY0dAo0/uEYWsove5nfOdCgip9g+eRk+Ss11PEzBCSq+xqoTTu3Jxiojma2URpJIQ HwUyjLS145wD5Luf85Y8jw6CxgTjIDDqucq6/mrvL61wi9ka5L9bv/SoyJpOMa1zvOVj Oqcg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=q/gPyzX5houMx56rDPPZ+T9jmCn/l6+TF2FXxv5O3eY=; fh=hbFFxISGzJlcFBKVChpRkjqflH8vGcvS/i23umxk4/Q=; b=CzsOPqllzxXUVXw0MPKrTEo04EuvOUDgovClSFwthyHWHuY9BzyLg/PNSv6vzyGuZ5 O8t4zOGJ3nvtvdRb2BG7a8Nqgs5YkDGomJFaRXaiaPHYcoVr6GkzzXYOkV0LxEwFWoqX eemGGdZxae37NEC2hV6pQoRSRSZSXIS/oCw65i0dYIp8s7Ztxvwhf3v3sONUuqQOtDwe hWdbGryjZjwHPLRRZELyJWQKXgpk/GXakUQdaNR+ScCH3eGaFGY7X91fE4/iKCP+vrBo XDxVrWvzsw15cIWiUgCPxTcBy28SsI5tjAXGpcE58I3yd2P6UtNkcqVsZ36RVfsLceIG 0fag== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kylehuey.com header.s=google header.b=ebUgtJn2; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from snail.vger.email (snail.vger.email. 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[76.126.33.191]) by smtp.gmail.com with ESMTPSA id n7-20020a63f807000000b005b529d633b7sm7894060pgh.14.2023.12.04.12.14.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Dec 2023 12:14:31 -0800 (PST) From: Kyle Huey X-Google-Original-From: Kyle Huey To: Kyle Huey , linux-kernel@vger.kernel.org Cc: Robert O'Callahan , Andrii Nakryiko , Mykola Lysenko , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH 2/2] selftest/bpf: Test returning zero from a perf bpf program suppresses SIGIO. Date: Mon, 4 Dec 2023 12:14:06 -0800 Message-Id: <20231204201406.341074-3-khuey@kylehuey.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231204201406.341074-1-khuey@kylehuey.com> References: <20231204201406.341074-1-khuey@kylehuey.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Mon, 04 Dec 2023 12:14:42 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784383676544754775 X-GMAIL-MSGID: 1784383676544754775 The test sets a hardware breakpoint and uses a bpf program to suppress the I/O availability signal if the ip matches the expected value. Signed-off-by: Kyle Huey --- .../selftests/bpf/prog_tests/perf_skip.c | 95 +++++++++++++++++++ .../selftests/bpf/progs/test_perf_skip.c | 23 +++++ 2 files changed, 118 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/perf_skip.c create mode 100644 tools/testing/selftests/bpf/progs/test_perf_skip.c diff --git a/tools/testing/selftests/bpf/prog_tests/perf_skip.c b/tools/testing/selftests/bpf/prog_tests/perf_skip.c new file mode 100644 index 000000000000..b269a31669b7 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/perf_skip.c @@ -0,0 +1,95 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include +#include "test_perf_skip.skel.h" +#include +#include + +#define BPF_OBJECT "test_perf_skip.bpf.o" + +static void handle_sig(int) +{ + ASSERT_OK(1, "perf event not skipped"); +} + +static noinline int test_function(void) +{ + return 0; +} + +void serial_test_perf_skip(void) +{ + sighandler_t previous; + int duration = 0; + struct test_perf_skip *skel = NULL; + int map_fd = -1; + long page_size = sysconf(_SC_PAGE_SIZE); + uintptr_t *ip = NULL; + int prog_fd = -1; + struct perf_event_attr attr = {0}; + int perf_fd = -1; + struct f_owner_ex owner; + int err; + + previous = signal(SIGIO, handle_sig); + + skel = test_perf_skip__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_load")) + goto cleanup; + + prog_fd = bpf_program__fd(skel->progs.handler); + if (!ASSERT_OK(prog_fd < 0, "bpf_program__fd")) + goto cleanup; + + map_fd = bpf_map__fd(skel->maps.ip); + if (!ASSERT_OK(map_fd < 0, "bpf_map__fd")) + goto cleanup; + + ip = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, map_fd, 0); + if (!ASSERT_OK_PTR(ip, "mmap bpf map")) + goto cleanup; + + *ip = (uintptr_t)test_function; + + attr.type = PERF_TYPE_BREAKPOINT; + attr.size = sizeof(attr); + attr.bp_type = HW_BREAKPOINT_X; + attr.bp_addr = (uintptr_t)test_function; + attr.bp_len = sizeof(long); + attr.sample_period = 1; + attr.sample_type = PERF_SAMPLE_IP; + attr.pinned = 1; + attr.exclude_kernel = 1; + attr.exclude_hv = 1; + attr.precise_ip = 3; + + perf_fd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0); + if (CHECK(perf_fd < 0, "perf_event_open", "err %d\n", perf_fd)) + goto cleanup; + + err = fcntl(perf_fd, F_SETFL, O_ASYNC); + if (!ASSERT_OK(err, "fcntl(F_SETFL, O_ASYNC)")) + goto cleanup; + + owner.type = F_OWNER_TID; + owner.pid = gettid(); + err = fcntl(perf_fd, F_SETOWN_EX, &owner); + if (!ASSERT_OK(err, "fcntl(F_SETOWN_EX)")) + goto cleanup; + + err = ioctl(perf_fd, PERF_EVENT_IOC_SET_BPF, prog_fd); + if (!ASSERT_OK(err, "ioctl(PERF_EVENT_IOC_SET_BPF)")) + goto cleanup; + + test_function(); + +cleanup: + if (perf_fd >= 0) + close(perf_fd); + if (ip) + munmap(ip, page_size); + if (skel) + test_perf_skip__destroy(skel); + + signal(SIGIO, previous); +} diff --git a/tools/testing/selftests/bpf/progs/test_perf_skip.c b/tools/testing/selftests/bpf/progs/test_perf_skip.c new file mode 100644 index 000000000000..ef01a9161afe --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_perf_skip.c @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "vmlinux.h" +#include +#include + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 1); + __uint(map_flags, BPF_F_MMAPABLE); + __type(key, uint32_t); + __type(value, uintptr_t); +} ip SEC(".maps"); + +SEC("perf_event") +int handler(struct bpf_perf_event_data *data) +{ + const uint32_t index = 0; + uintptr_t *v = bpf_map_lookup_elem(&ip, &index); + + return !(v && *v == PT_REGS_IP(&data->regs)); +} + +char _license[] SEC("license") = "GPL";