From patchwork Fri Jun 19 21:56:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ralph Campbell X-Patchwork-Id: 208365 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 46C95C433E0 for ; Fri, 19 Jun 2020 21:58:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1EC9922210 for ; Fri, 19 Jun 2020 21:58:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="KXI6tObJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728309AbgFSV5L (ORCPT ); Fri, 19 Jun 2020 17:57:11 -0400 Received: from hqnvemgate24.nvidia.com ([216.228.121.143]:8491 "EHLO hqnvemgate24.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728259AbgFSV5H (ORCPT ); Fri, 19 Jun 2020 17:57:07 -0400 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Fri, 19 Jun 2020 14:55:26 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Fri, 19 Jun 2020 14:57:07 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Fri, 19 Jun 2020 14:57:07 -0700 Received: from HQMAIL111.nvidia.com (172.20.187.18) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 19 Jun 2020 21:56:59 +0000 Received: from hqnvemgw03.nvidia.com (10.124.88.68) by HQMAIL111.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Fri, 19 Jun 2020 21:56:59 +0000 Received: from rcampbell-dev.nvidia.com (Not Verified[10.110.48.66]) by hqnvemgw03.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Fri, 19 Jun 2020 14:56:59 -0700 From: Ralph Campbell To: , , , , CC: Jerome Glisse , John Hubbard , Christoph Hellwig , Jason Gunthorpe , "Ben Skeggs" , Andrew Morton , Shuah Khan , Ralph Campbell Subject: [PATCH 06/16] mm/hmm: test mixed normal and device private migrations Date: Fri, 19 Jun 2020 14:56:39 -0700 Message-ID: <20200619215649.32297-7-rcampbell@nvidia.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200619215649.32297-1-rcampbell@nvidia.com> References: <20200619215649.32297-1-rcampbell@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1592603726; bh=WFEHCal/gCxROdrgkDzRDfE196T9tyXmpg2D/HYI1XY=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=KXI6tObJ5oTpDCSapDH+P+HDDS1sHlEs6IY8U+F8yA+CNTh3TGWL08aSrGrVJDdEk 4+hhQ7CeAcfhYZPA1V12+m0twUBVV1/dQJNz87q+KFer73+2p9OvPiszT3nHnSqyy0 71alAOAQCO5Ayi3dQPAx+ja+ZGPkhoaw+JRo8Fc/QOqX9TvpJgu8gvO9Rh1Pfw1ZFH Ryl7MZncUdy2sq5NLByALPlQUU8cL7A12pk+/YgpgY9FnQH9+4Kyg5c+8IWoWue1jO MAvqIY0JcKxx+vn+MVEie4P2D8VVJiXgOop00f7tI6m6ax852mLbrY53XPUBS0Gbn2 VSsAMh+L63vXQ== Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add a test to check that migrating a range of addresses with mixed device private pages and normal anonymous pages are all migrated. Signed-off-by: Ralph Campbell --- lib/test_hmm.c | 22 +++++++++++++++++----- tools/testing/selftests/vm/hmm-tests.c | 18 ++++++++++++++---- 2 files changed, 31 insertions(+), 9 deletions(-) diff --git a/lib/test_hmm.c b/lib/test_hmm.c index f7c2b51a7a9d..50bdf041770a 100644 --- a/lib/test_hmm.c +++ b/lib/test_hmm.c @@ -588,12 +588,24 @@ static void dmirror_migrate_alloc_and_copy(struct migrate_vma *args, /* * Don't migrate device private pages from our own driver or - * others. For our own we would do a device private memory copy - * not a migration and for others, we would need to fault the - * other device's page into system memory first. + * others. Other device's private pages are skipped because + * the src_owner field won't match. The migrate_vma_setup() + * will have invalidated our page tables for our own device + * private pages as part of isolating and locking the pages. + * In this case, repopulate our page table. */ - if (spage && is_zone_device_page(spage)) + if (spage && is_zone_device_page(spage)) { + unsigned long pfn = addr >> PAGE_SHIFT; + void *entry; + + mutex_lock(&dmirror->mutex); + entry = spage->zone_device_data; + if (*src & MIGRATE_PFN_WRITE) + entry = xa_tag_pointer(entry, DPT_XA_TAG_WRITE); + xa_store(&dmirror->pt, pfn, entry, GFP_ATOMIC); + mutex_unlock(&dmirror->mutex); continue; + } dpage = dmirror_devmem_alloc_page(mdevice); if (!dpage) @@ -703,7 +715,7 @@ static int dmirror_migrate(struct dmirror *dmirror, args.dst = dst_pfns; args.start = addr; args.end = next; - args.src_owner = NULL; + args.src_owner = dmirror->mdevice; ret = migrate_vma_setup(&args); if (ret) goto out; diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c index bdfa95ac9a7d..e2a36783e99d 100644 --- a/tools/testing/selftests/vm/hmm-tests.c +++ b/tools/testing/selftests/vm/hmm-tests.c @@ -881,8 +881,9 @@ TEST_F(hmm, migrate) } /* - * Migrate anonymous memory to device private memory and fault it back to system - * memory. + * Migrate anonymous memory to device private memory and fault some of it back + * to system memory, then try migrating the resulting mix of system and device + * private memory to the device. */ TEST_F(hmm, migrate_fault) { @@ -924,8 +925,17 @@ TEST_F(hmm, migrate_fault) for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i) ASSERT_EQ(ptr[i], i); - /* Fault pages back to system memory and check them. */ - for (i = 0, ptr = buffer->ptr; i < size / sizeof(*ptr); ++i) + /* Fault half the pages back to system memory and check them. */ + for (i = 0, ptr = buffer->ptr; i < size / (2 * sizeof(*ptr)); ++i) + ASSERT_EQ(ptr[i], i); + + /* Migrate memory to the device again. */ + ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_MIGRATE, buffer, npages); + ASSERT_EQ(ret, 0); + ASSERT_EQ(buffer->cpages, npages); + + /* Check what the device read. */ + for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i) ASSERT_EQ(ptr[i], i); hmm_buffer_free(buffer);