From patchwork Wed Jun 19 00:05:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 13703192 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (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 C4446193; Wed, 19 Jun 2024 00:05:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718755535; cv=none; b=AZSZct0KKcuUNndRSBpJfZ4VUBgnOVciR7Z/Ud4obIH8UqiUWPSAEMesNyDjFXHNf3MfuvkpoHkvqlnBgJ1FociiPzzNZTmkCYE2A9Z/ArsNENQxUhEoY7TnJmCRNFXAh4N45tVw5XuIPe04xzinmWwQgZVoynqMC6NpWkRqh0Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718755535; c=relaxed/simple; bh=3rFLb8JSB4SyXYfQa9wLnefBGieNG3xQZFmGCShvn4Y=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:References: In-Reply-To:To:CC; b=o0JoOhy7tOnL7luS3PWhdPrX3pPWtJIDy9/GMjvGbFe3fL9fG9fcZ7NkVuWN+ElLfYsko5gXzxk/qmaKbCu+azjvLp+nq5VHdDZvcvJP/i/HnT+5U3Mw+R3eoMoXsk6XS4AuRlbKaaEa+FPmAnV6LFD0d9wksgvD/Q+ho07kfsQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=o2j3NCQE; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="o2j3NCQE" Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 45ILb6Xo000504; Wed, 19 Jun 2024 00:05:19 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= iMkszGdm9ae/n7pRpO/rrT8MarQ3LgEe54I6kubPvLI=; b=o2j3NCQEJTFU2hZA IcfJBRdS+w2hLNTSnVEQqnCk6AXpZRPDzzyjWU3587KuuQzZLw5I/0tOLUNVu6UP Rs6j0xFWBjkFJmhUD+PeP0g9pvohDo5Y8d2hN4+BOXp6oLp/9rFH5UWggdClLz25 rRhoaL7pj6CoQXuGDGoeGiDlQlUrTPKq5n4fqNiF4XWg7fYW2lZIs0xabEKlei/F fubw4xm7gCPQsE4bGTlJ+UpHrkc22hnsqi5ae6AcKEp8m+Dmg7hgq2ReUMYGqtoV N2eCzPir57qdth9XiRT9nDGlGmmenoIIk2FhV/utsVba60mRmieP4CfYuSeG0BnC WXrfVg== Received: from nasanppmta03.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3yujag07ba-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 19 Jun 2024 00:05:19 +0000 (GMT) Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA03.qualcomm.com (8.17.1.19/8.17.1.19) with ESMTPS id 45J05IcW029972 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 19 Jun 2024 00:05:18 GMT Received: from hu-eberman-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Tue, 18 Jun 2024 17:05:18 -0700 From: Elliot Berman Date: Tue, 18 Jun 2024 17:05:11 -0700 Subject: [PATCH RFC 5/5] mm/gup_test: Verify GUP grabs same pages twice Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240618-exclusive-gup-v1-5-30472a19c5d1@quicinc.com> References: <20240618-exclusive-gup-v1-0-30472a19c5d1@quicinc.com> In-Reply-To: <20240618-exclusive-gup-v1-0-30472a19c5d1@quicinc.com> To: Andrew Morton , Shuah Khan , David Hildenbrand , Matthew Wilcox , CC: , , , , , , Elliot Berman X-Mailer: b4 0.13.0 X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: unhDqPMZarSEVc31r4x6VcJKNGdRtYup X-Proofpoint-ORIG-GUID: unhDqPMZarSEVc31r4x6VcJKNGdRtYup X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-18_06,2024-06-17_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxscore=0 clxscore=1015 impostorscore=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 phishscore=0 mlxlogscore=880 bulkscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406180176 GUP'ing pages should get the same pages, test it. In case of FOLL_EXCLUSIVE, the second pin should fail to get any pages. Note: this change ought to be refactored to pull out the GUP'ing bits that's duplicated between the original and the second GUP. Signed-off-by: Elliot Berman --- mm/gup_test.c | 86 +++++++++++++++++++++++++++++++++++ mm/gup_test.h | 1 + tools/testing/selftests/mm/gup_test.c | 5 +- 3 files changed, 91 insertions(+), 1 deletion(-) diff --git a/mm/gup_test.c b/mm/gup_test.c index 9c6b8c93e44a7..28cc422b60b78 100644 --- a/mm/gup_test.c +++ b/mm/gup_test.c @@ -86,6 +86,89 @@ static void verify_exclusive_pinned(unsigned int gup_flags, struct page **pages, } } +static int verify_gup_twice(unsigned int cmd, struct gup_test *gup, + struct page **expected_pages, + unsigned long expected_nr_pages) +{ + unsigned long i, nr_pages, addr, next; + long nr; + struct page **pages __free(kfree) = NULL; + int ret = 0; + + nr_pages = gup->size / PAGE_SIZE; + pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL); + if (!pages) + return -ENOMEM; + + i = 0; + nr = gup->nr_pages_per_call; + for (addr = gup->addr; addr < gup->addr + gup->size; addr = next) { + if (nr != gup->nr_pages_per_call) + break; + + next = addr + nr * PAGE_SIZE; + if (next > gup->addr + gup->size) { + next = gup->addr + gup->size; + nr = (next - addr) / PAGE_SIZE; + } + + switch (cmd) { + case GUP_FAST_BENCHMARK: + nr = get_user_pages_fast(addr, nr, gup->gup_flags, + pages + i); + break; + case GUP_BASIC_TEST: + nr = get_user_pages(addr, nr, gup->gup_flags, pages + i); + break; + case PIN_FAST_BENCHMARK: + nr = pin_user_pages_fast(addr, nr, gup->gup_flags, + pages + i); + break; + case PIN_BASIC_TEST: + nr = pin_user_pages(addr, nr, gup->gup_flags, pages + i); + break; + case PIN_LONGTERM_BENCHMARK: + nr = pin_user_pages(addr, nr, + gup->gup_flags | FOLL_LONGTERM, + pages + i); + break; + default: + pr_err("cmd %d not supported for %s\n", cmd, __func__); + return -EINVAL; + } + + if (nr <= 0) + break; + i += nr; + } + + nr_pages = i; + + if (gup->gup_flags & FOLL_EXCLUSIVE) { + if (WARN(nr_pages, + "Able to acquire exclusive pin twice for %ld of %ld pages", + nr_pages, expected_nr_pages)) { + dump_page(pages[0], + "gup_test: verify_gup_twice() test"); + ret = -EIO; + } + } else if (nr_pages != expected_nr_pages) { + pr_err("%s: Expected %ld pages, got %ld\n", __func__, + expected_nr_pages, nr_pages); + ret = -EIO; + } else { + for (i = 0; i < nr_pages; i++) { + if (WARN(pages[i] != expected_pages[i], + "pages[%lu] mismatch\n", i)) + break; + } + } + + put_back_pages(cmd, pages, nr_pages, gup->test_flags); + + return ret; +} + static void dump_pages_test(struct gup_test *gup, struct page **pages, unsigned long nr_pages) { @@ -210,6 +293,9 @@ static int __gup_test_ioctl(unsigned int cmd, if (cmd == DUMP_USER_PAGES_TEST) dump_pages_test(gup, pages, nr_pages); + if (gup->test_flags & GUP_TEST_FLAG_GUP_TWICE) + ret = verify_gup_twice(cmd, gup, pages, nr_pages); + start_time = ktime_get(); put_back_pages(cmd, pages, nr_pages, gup->test_flags); diff --git a/mm/gup_test.h b/mm/gup_test.h index 5b37b54e8bea6..fcd41919b0159 100644 --- a/mm/gup_test.h +++ b/mm/gup_test.h @@ -17,6 +17,7 @@ #define GUP_TEST_MAX_PAGES_TO_DUMP 8 #define GUP_TEST_FLAG_DUMP_PAGES_USE_PIN 0x1 +#define GUP_TEST_FLAG_GUP_TWICE 0x2 struct gup_test { __u64 get_delta_usec; diff --git a/tools/testing/selftests/mm/gup_test.c b/tools/testing/selftests/mm/gup_test.c index bdeaac67ff9aa..b4b10c8338f80 100644 --- a/tools/testing/selftests/mm/gup_test.c +++ b/tools/testing/selftests/mm/gup_test.c @@ -98,7 +98,7 @@ int main(int argc, char **argv) pthread_t *tid; char *p; - while ((opt = getopt(argc, argv, "m:r:n:F:f:abcj:tTLUuwWSHpz")) != -1) { + while ((opt = getopt(argc, argv, "m:r:n:F:f:abcj:dtTLUuwWSHpz")) != -1) { switch (opt) { case 'a': cmd = PIN_FAST_BENCHMARK; @@ -172,6 +172,9 @@ int main(int argc, char **argv) /* fault pages in gup, do not fault in userland */ touch = 1; break; + case 'd': + gup.test_flags |= GUP_TEST_FLAG_GUP_TWICE; + break; default: ksft_exit_fail_msg("Wrong argument\n"); }