From patchwork Wed Jul 1 22:53:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ralph Campbell X-Patchwork-Id: 11637485 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 D725A13B4 for ; Wed, 1 Jul 2020 22:54:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C145620853 for ; Wed, 1 Jul 2020 22:54:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="sCvs0+5a" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727976AbgGAWy3 (ORCPT ); Wed, 1 Jul 2020 18:54:29 -0400 Received: from hqnvemgate25.nvidia.com ([216.228.121.64]:19501 "EHLO hqnvemgate25.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726586AbgGAWyN (ORCPT ); Wed, 1 Jul 2020 18:54:13 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate25.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 01 Jul 2020 15:53:22 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Wed, 01 Jul 2020 15:54:12 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Wed, 01 Jul 2020 15:54:12 -0700 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 1 Jul 2020 22:54:04 +0000 Received: from rnnvemgw01.nvidia.com (10.128.109.123) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 1 Jul 2020 22:54:03 +0000 Received: from rcampbell-dev.nvidia.com (Not Verified[10.110.48.66]) by rnnvemgw01.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Wed, 01 Jul 2020 15:54:03 -0700 From: Ralph Campbell To: , , , , CC: Jerome Glisse , John Hubbard , Christoph Hellwig , Jason Gunthorpe , "Andrew Morton" , Shuah Khan , "Ben Skeggs" , Ralph Campbell Subject: [PATCH v3 0/5] mm/hmm/nouveau: add PMD system memory mapping Date: Wed, 1 Jul 2020 15:53:47 -0700 Message-ID: <20200701225352.9649-1-rcampbell@nvidia.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-NVConfidentiality: public DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1593644002; bh=MJfr/HRLE6OMXyolgR7JmbdNUj2YCkglGntcmeExnQQ=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: MIME-Version:X-NVConfidentiality:Content-Transfer-Encoding: Content-Type; b=sCvs0+5aWDEOa98ScHYnH1kou2nuKpIArM70MeHNN0z0Lr2no8sM2jlI5eFdengEi E+EDwBZoNE23w6xILrPPhA7UnQef8+TszwrfBGodCUpC9KY/0jTaS2ESZ8FGYMGJOc ZzhDvtIDp/v45zSQg8e7TdlJg4gwJJmf2Vme3SJ8Uf3hBwc13UsxccJxTpCXK8J551 RR/eLZBrmiSGQdHD1T/LjRsWVOvVcYUEvQ1Hnie2f73rD3baTsk0WOT4DyEnu479CW Gvu/PHs94sF/7QBbqZDK8kMjXvmZtHIQk1SeYxLbpF8jNVRMfDiSwgYwaG8jEq3bla OA1t1ZY+Q64uA== Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org The goal for this series is to introduce the hmm_pfn_to_map_order() function. This allows a device driver to know that a given 4K PFN is actually mapped by the CPU using a larger sized CPU page table entry and therefore the device driver can safely map system memory using larger device MMU PTEs. The series is based on 5.8.0-rc3 and is intended for Jason Gunthorpe's hmm tree. These were originally part of a larger series: https://lore.kernel.org/linux-mm/20200619215649.32297-1-rcampbell@nvidia.com/ Changes in v3: Replaced the HMM_PFN_P[MU]D flags with hmm_pfn_to_map_order() to indicate the size of the CPU mapping. Changes in v2: Make the hmm_range_fault() API changes into a separate series and add two output flags for PMD/PUD instead of a single compund page flag as suggested by Jason Gunthorpe. Make the nouveau page table changes a separate patch as suggested by Ben Skeggs. Only add support for 2MB nouveau mappings initially since changing the 1:1 CPU/GPU page table size assumptions requires a bigger set of changes. Rebase to 5.8.0-rc3. Ralph Campbell (5): nouveau/hmm: fault one page at a time mm/hmm: add hmm_mapping order nouveau: fix mapping 2MB sysmem pages nouveau/hmm: support mapping large sysmem pages hmm: add tests for HMM_PFN_PMD flag drivers/gpu/drm/nouveau/nouveau_svm.c | 236 ++++++++---------- drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c | 5 +- .../drm/nouveau/nvkm/subdev/mmu/vmmgp100.c | 82 ++++++ include/linux/hmm.h | 24 +- lib/test_hmm.c | 4 + lib/test_hmm_uapi.h | 4 + mm/hmm.c | 14 +- tools/testing/selftests/vm/hmm-tests.c | 76 ++++++ 8 files changed, 299 insertions(+), 146 deletions(-)