From patchwork Fri Jun 19 21:56:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ralph Campbell X-Patchwork-Id: 11615239 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1C7B014E3 for ; Fri, 19 Jun 2020 21:59:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F211F22254 for ; Fri, 19 Jun 2020 21:59:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="I7rwRv4j" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728164AbgFSV7E (ORCPT ); Fri, 19 Jun 2020 17:59:04 -0400 Received: from hqnvemgate26.nvidia.com ([216.228.121.65]:2193 "EHLO hqnvemgate26.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728242AbgFSV5H (ORCPT ); Fri, 19 Jun 2020 17:57:07 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate26.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Fri, 19 Jun 2020 14:56:53 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Fri, 19 Jun 2020 14:57:06 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Fri, 19 Jun 2020 14:57:06 -0700 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL105.nvidia.com (172.20.187.12) 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 HQMAIL105.nvidia.com (172.20.187.12) 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 05/16] mm/hmm/test: remove redundant page table invalidate Date: Fri, 19 Jun 2020 14:56:38 -0700 Message-ID: <20200619215649.32297-6-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=1592603813; bh=/sU0fsdcnEwURrqlxGb1H/zsI5qpcxe39CKQwEfKf7w=; 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=I7rwRv4jtx0PGmvB9STFPnybf36OQ/oYAAEEfTxoK6JTZPjO9M24eLKi1nRSwaZ5n 15aqTCY0n/5hRAi4O0IZZfy+U9KY5r/HBVKepmXUMf5o6FkYtz5XRLXd/hfXb0nvwa 4s6c9wgBjqd2tvbOEyTQyyyFRKww5AcjKlMSzAn/Q8+W99JQoCyZhOJ9QSaF8cYZp7 Dd2Ku+wjYpqSA/fHUxPD30JaFCboOViegswfhiOmnNGWr1lQFy3sMkZWXJhCGoN3jg L/l4NTUss+RttcS4JNW06KSPhAT7GmXTyzdXmxYQRmJO+wiW4vi4pvxJzedEk/BrfU mKSzmLt5kU+Ag== Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org When migrating pages to or from device private memory, the device's page tables will be invalidated as part of migrate_vma_setup() locking and isolating the pages. The HMM self test driver doesn't need to invalidate the page table a second time after migrating pages to system memory so remove that bit of extra code. Signed-off-by: Ralph Campbell --- lib/test_hmm.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/lib/test_hmm.c b/lib/test_hmm.c index 28528285942c..f7c2b51a7a9d 100644 --- a/lib/test_hmm.c +++ b/lib/test_hmm.c @@ -1018,15 +1018,6 @@ static vm_fault_t dmirror_devmem_fault_alloc_and_copy(struct migrate_vma *args, return 0; } -static void dmirror_devmem_fault_finalize_and_map(struct migrate_vma *args, - struct dmirror *dmirror) -{ - /* Invalidate the device's page table mapping. */ - mutex_lock(&dmirror->mutex); - dmirror_do_update(dmirror, args->start, args->end); - mutex_unlock(&dmirror->mutex); -} - static vm_fault_t dmirror_devmem_fault(struct vm_fault *vmf) { struct migrate_vma args; @@ -1059,7 +1050,10 @@ static vm_fault_t dmirror_devmem_fault(struct vm_fault *vmf) if (ret) return ret; migrate_vma_pages(&args); - dmirror_devmem_fault_finalize_and_map(&args, dmirror); + /* + * No device finalize step is needed since migrate_vma_setup() will + * have already invalidated the device page table. + */ migrate_vma_finalize(&args); return 0; }