From patchwork Wed Jun 26 13:46:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 13712974 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2746E18C35C; Wed, 26 Jun 2024 13:47:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719409633; cv=none; b=KytstjYPYD95HHvt+rxL7nS+qvLGcXQO5BrpNMpIHSfFh3PX3yFjpZnoBGDZGUly635oRWlM9NJdV2tpK04mMJ3P7VKFyorxdWX/m23dE6lnSFKYVZ0ELWC5rQLMsIUjOEQ1gINeun8jwUQn6r7081i/MduJAbnODKTitPz+PQA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719409633; c=relaxed/simple; bh=8DVfI5Mgh3sBj3CpzjHKwk7ojiMdJpUgU0LXrBaKg2c=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=URdVfHAo3IPgOENqsE5SynGoHdFD0MuKtl8/hr3nUFhG7g75lQnkSNUs3zYwYnfivLIye66fJDD5t9/DvPlcSZndwca3LwppeEdjfw+IAvc9yJAWtLGynXZ6Osbu7ojSy7zeXxC8VSsbgu/1LPagesYlfWLd9oqtt6US3JksFoc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AnLkus0S; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AnLkus0S" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D388DC32782; Wed, 26 Jun 2024 13:47:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719409632; bh=8DVfI5Mgh3sBj3CpzjHKwk7ojiMdJpUgU0LXrBaKg2c=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=AnLkus0ScJlNtHUTw9KITY2V/hjtnycgXxOlFC6L5c1V24zrpjWKsjW8TkYOaVf3v 9CItVAIaGnzFxkKbnhCVlRZ4/CwyQlgqkAw8SQv5sO3n46QT5juEiOCD8lgLZgFitt tiewbBnUoZqfVRSobPMgMIiGe40JN9fqfOHztEpTIa6cgNo+fl68HT9W/Ucdl9ykBw Mmjr2nxEXyYoRfH6pcaazP/ZcoBbK7ey7QVtmZzHfV52BISMc8DeTNRIdf8Eo0Xnm+ a7DXzkiDeOrKeetS+wTOSxFZRqNti19Ibj3OJl2v2sO15iYRtsQtwZVnJgu+bKJuRb qmprk5Se1UmAw== From: Benjamin Tissoires Date: Wed, 26 Jun 2024 15:46:33 +0200 Subject: [PATCH HID v2 12/13] selftests/hid: add another test for injecting an event from an event hook Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240626-hid_hw_req_bpf-v2-12-cfd60fb6c79f@kernel.org> References: <20240626-hid_hw_req_bpf-v2-0-cfd60fb6c79f@kernel.org> In-Reply-To: <20240626-hid_hw_req_bpf-v2-0-cfd60fb6c79f@kernel.org> To: Jiri Kosina , Alexei Starovoitov , Shuah Khan , Jonathan Corbet Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, Benjamin Tissoires X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1719409602; l=4137; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=8DVfI5Mgh3sBj3CpzjHKwk7ojiMdJpUgU0LXrBaKg2c=; b=DvtSTPl9Sbeel8MPOCTiv0xr/zIBIx8/BnIBFF/7gK7Yik5kufwDTjLOlFE4C8CavsG79lPZW dAQDSh/zHOnAqyrKfAvW448xXEFrBMKWxNpmKPQHR6ixZeHhFdbGTj6 X-Developer-Key: i=bentiss@kernel.org; a=ed25519; pk=7D1DyAVh6ajCkuUTudt/chMuXWIJHlv2qCsRkIizvFw= Similar to test_multiply_events_wq: we receive one event and inject a new one. But given that this time we are already in the event hook, we can use hid_bpf_try_input_report() directly as this function will not sleep. Note that the injected event gets processed before the original one this way. Signed-off-by: Benjamin Tissoires --- no changes in v2 --- tools/testing/selftests/hid/hid_bpf.c | 36 ++++++++++++++++++++ tools/testing/selftests/hid/progs/hid.c | 39 ++++++++++++++++++++++ .../testing/selftests/hid/progs/hid_bpf_helpers.h | 4 +++ 3 files changed, 79 insertions(+) diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c index 31637b3b8db5..36bbad8e0f9f 100644 --- a/tools/testing/selftests/hid/hid_bpf.c +++ b/tools/testing/selftests/hid/hid_bpf.c @@ -1168,6 +1168,42 @@ TEST_F(hid_bpf, test_multiply_events_wq) ASSERT_EQ(buf[1], 3); } +/* + * Attach hid_multiply_event to the given uhid device, + * retrieve and open the matching hidraw node, + * inject one event in the uhid device, + * check that the program sees it and can add extra data + */ +TEST_F(hid_bpf, test_multiply_events) +{ + const struct test_program progs[] = { + { .name = "hid_test_multiply_events" }, + }; + __u8 buf[10] = {0}; + int err; + + LOAD_PROGRAMS(progs); + + /* inject one event */ + buf[0] = 1; + buf[1] = 42; + uhid_send_event(_metadata, self->uhid_fd, buf, 6); + + /* read the data from hidraw */ + memset(buf, 0, sizeof(buf)); + err = read(self->hidraw_fd, buf, sizeof(buf)); + ASSERT_EQ(err, 9) TH_LOG("read_hidraw"); + ASSERT_EQ(buf[0], 2); + ASSERT_EQ(buf[1], 47); + + /* read the data from hidraw */ + memset(buf, 0, sizeof(buf)); + err = read(self->hidraw_fd, buf, sizeof(buf)); + ASSERT_EQ(err, 9) TH_LOG("read_hidraw"); + ASSERT_EQ(buf[0], 2); + ASSERT_EQ(buf[1], 52); +} + /* * Attach hid_insert{0,1,2} to the given uhid device, * retrieve and open the matching hidraw node, diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c index f539a7a223cf..46feeb91d1d5 100644 --- a/tools/testing/selftests/hid/progs/hid.c +++ b/tools/testing/selftests/hid/progs/hid.c @@ -522,3 +522,42 @@ SEC(".struct_ops.link") struct hid_bpf_ops test_multiply_events_wq = { .hid_device_event = (void *)hid_test_multiply_events_wq, }; + +SEC("?struct_ops/hid_device_event") +int BPF_PROG(hid_test_multiply_events, struct hid_bpf_ctx *hid_ctx, enum hid_report_type type) +{ + __u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 9 /* size */); + __u8 buf[9]; + int ret; + + if (!data) + return 0; /* EPERM check */ + + if (data[0] != 1) + return 0; + + /* + * we have to use an intermediate buffer as hid_bpf_input_report + * will memset data to \0 + */ + __builtin_memcpy(buf, data, sizeof(buf)); + + buf[0] = 2; + buf[1] += 5; + ret = hid_bpf_try_input_report(hid_ctx, HID_INPUT_REPORT, buf, sizeof(buf)); + if (ret < 0) + return ret; + + /* + * In real world we should reset the original buffer as data might be garbage now, + * but it actually now has the content of 'buf' + */ + data[1] += 5; + + return 9; +} + +SEC(".struct_ops.link") +struct hid_bpf_ops test_multiply_events = { + .hid_device_event = (void *)hid_test_multiply_events, +}; diff --git a/tools/testing/selftests/hid/progs/hid_bpf_helpers.h b/tools/testing/selftests/hid/progs/hid_bpf_helpers.h index 8014383846d2..c72e44321764 100644 --- a/tools/testing/selftests/hid/progs/hid_bpf_helpers.h +++ b/tools/testing/selftests/hid/progs/hid_bpf_helpers.h @@ -89,6 +89,10 @@ extern int hid_bpf_input_report(struct hid_bpf_ctx *ctx, enum hid_report_type type, __u8 *data, size_t buf__sz) __ksym; +extern int hid_bpf_try_input_report(struct hid_bpf_ctx *ctx, + enum hid_report_type type, + __u8 *data, + size_t buf__sz) __ksym; /* bpf_wq implementation */ extern int bpf_wq_init(struct bpf_wq *wq, void *p__map, unsigned int flags) __weak __ksym;