From patchwork Mon Oct 28 20:10:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Gunthorpe X-Patchwork-Id: 11216587 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 2936F913 for ; Mon, 28 Oct 2019 21:08:12 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1038D217D6 for ; Mon, 28 Oct 2019 21:08:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1038D217D6 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id AE08E6EA59; Mon, 28 Oct 2019 21:07:59 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-qt1-x841.google.com (mail-qt1-x841.google.com [IPv6:2607:f8b0:4864:20::841]) by gabe.freedesktop.org (Postfix) with ESMTPS id 79C5789CD8 for ; Mon, 28 Oct 2019 20:10:46 +0000 (UTC) Received: by mail-qt1-x841.google.com with SMTP id t8so16532403qtc.6 for ; Mon, 28 Oct 2019 13:10:46 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=U5pRz73cidpozifut11i/Qo3t+yY00cTSdM8idTfn1I=; b=dcka46IFCJpzQKVI+kGxo0P0DB0y3HTX53Zsxm0fk8NQqw+dYKZMbnuJTilu+552AQ U2nCgm8mQwCZ9ZD9CMLaSOiAsmJvzkP9w+GvMT0e01GgLvu0gScAmTlrDwOi+rsvfe35 adT81VKoYWF5BnihyRuxnuaQLNMjyINSgi0HFX0xl89dLKc2Nfi5fvvBw2riz6yeX71i 5LlKlfpAkw6dORHjjruQhNf8qjBJFxripvT925ZNRrZ4+3qtAAJo7GGFUMGwjPpT/Q9F SSaniK7gJmeXalCwQh/Th+eDfNIx7uX0m4DD0uOTVVQKCvBSBULz1F46dzYuhZ7M5mPA /mqg== X-Gm-Message-State: APjAAAUHS5UNAocCrt0TINSqIj6tDCANGvE5QIlvVeqDTw58IuZNU9pk 9fRdfv1wGrnS++pLhvuY4qE/qQ== X-Google-Smtp-Source: APXvYqyBvpLtbqvoSc7BERARg9JSjdZy3p22+Vxs4zvuhW77of4HZKy8Nj7mkBzSwHMR2XNBRVGs/g== X-Received: by 2002:ac8:464f:: with SMTP id f15mr253969qto.323.1572293445566; Mon, 28 Oct 2019 13:10:45 -0700 (PDT) Received: from ziepe.ca (hlfxns017vw-142-162-113-180.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.113.180]) by smtp.gmail.com with ESMTPSA id d10sm5719718qko.29.2019.10.28.13.10.43 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 28 Oct 2019 13:10:43 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1iPBLe-0001fy-W1; Mon, 28 Oct 2019 17:10:43 -0300 From: Jason Gunthorpe To: linux-mm@kvack.org, Jerome Glisse , Ralph Campbell , John Hubbard , Felix.Kuehling@amd.com Subject: [PATCH v2 00/15] Consolidate the mmu notifier interval_tree and locking Date: Mon, 28 Oct 2019 17:10:17 -0300 Message-Id: <20191028201032.6352-1-jgg@ziepe.ca> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 X-Mailman-Approved-At: Mon, 28 Oct 2019 21:07:58 +0000 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=U5pRz73cidpozifut11i/Qo3t+yY00cTSdM8idTfn1I=; b=b8Wfb91nM9LzESUx0mWWeO1hcooHxpGOSvdLn5mUQNDm+SvwsmozLjOcfd4rT8RvM5 kNwFzWeqTR5NrFbfuQts9/Mv3C/wIHuRahaPjy4r53xiyMhRJ8maHJv4YGMk3iZO8jKw cO7qRH6sUKCstPiObwYKoc3tu4kNTF7zWGDXXB/e4Udi2wdI9shca8gKN31PqAg6jPrp u4yVj9dhhjZytLW/RVcuVJly37G+vKGA8blm4qzRqJ6bQK28UertCy66jI8t3r+ML/hw sKUDxxVtQX8TbfeMl9fuoEqghJhTvUzf0YOFHKGkMqcp/jQDThJwx5gZYveZ+xiex9ET GyCA== X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Mike Marciniszyn , Stefano Stabellini , Oleksandr Andrushchenko , linux-rdma@vger.kernel.org, nouveau@lists.freedesktop.org, Dennis Dalessandro , amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , dri-devel@lists.freedesktop.org, Alex Deucher , xen-devel@lists.xenproject.org, Boris Ostrovsky , Petr Cvek , =?utf-8?q?Christian_K=C3=B6nig?= , Ben Skeggs Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Jason Gunthorpe 8 of the mmu_notifier using drivers (i915_gem, radeon_mn, umem_odp, hfi1, scif_dma, vhost, gntdev, hmm) drivers are using a common pattern where they only use invalidate_range_start/end and immediately check the invalidating range against some driver data structure to tell if the driver is interested. Half of them use an interval_tree, the others are simple linear search lists. Of the ones I checked they largely seem to have various kinds of races, bugs and poor implementation. This is a result of the complexity in how the notifier interacts with get_user_pages(). It is extremely difficult to use it correctly. Consolidate all of this code together into the core mmu_notifier and provide a locking scheme similar to hmm_mirror that allows the user to safely use get_user_pages() and reliably know if the page list still matches the mm. This new arrangment plays nicely with the !blockable mode for OOM. Scanning the interval tree is done such that the intersection test will always succeed, and since there is no invalidate_range_end exposed to drivers the scheme safely allows multiple drivers to be subscribed. Four places are converted as an example of how the new API is used. Four are left for future patches: - i915_gem has complex locking around destruction of a registration, needs more study - hfi1 (2nd user) needs access to the rbtree - scif_dma has a complicated logic flow - vhost's mmu notifiers are already being rewritten This series, and the other code it depends on is available on my github: https://github.com/jgunthorpe/linux/commits/mmu_notifier v2 changes: - Add mmu_range_set_seq() to set the mrn sequence number under the driver lock and make the locking more understandable - Add some additional comments around locking/READ_ONCe - Make the WARN_ON flow in mn_itree_invalidate a bit easier to follow - Fix wrong WARN_ON Jason Gunthorpe (15): mm/mmu_notifier: define the header pre-processor parts even if disabled mm/mmu_notifier: add an interval tree notifier mm/hmm: allow hmm_range to be used with a mmu_range_notifier or hmm_mirror mm/hmm: define the pre-processor related parts of hmm.h even if disabled RDMA/odp: Use mmu_range_notifier_insert() RDMA/hfi1: Use mmu_range_notifier_inset for user_exp_rcv drm/radeon: use mmu_range_notifier_insert xen/gntdev: Use select for DMA_SHARED_BUFFER xen/gntdev: use mmu_range_notifier_insert nouveau: use mmu_notifier directly for invalidate_range_start nouveau: use mmu_range_notifier instead of hmm_mirror drm/amdgpu: Call find_vma under mmap_sem drm/amdgpu: Use mmu_range_insert instead of hmm_mirror drm/amdgpu: Use mmu_range_notifier instead of hmm_mirror mm/hmm: remove hmm_mirror and related Documentation/vm/hmm.rst | 105 +--- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 + .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 9 +- drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 14 +- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 457 +++------------ drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h | 53 -- drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 13 +- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 111 ++-- drivers/gpu/drm/nouveau/nouveau_svm.c | 231 +++++--- drivers/gpu/drm/radeon/radeon.h | 9 +- drivers/gpu/drm/radeon/radeon_mn.c | 219 ++----- drivers/infiniband/core/device.c | 1 - drivers/infiniband/core/umem_odp.c | 288 +-------- drivers/infiniband/hw/hfi1/file_ops.c | 2 +- drivers/infiniband/hw/hfi1/hfi.h | 2 +- drivers/infiniband/hw/hfi1/user_exp_rcv.c | 146 ++--- drivers/infiniband/hw/hfi1/user_exp_rcv.h | 3 +- drivers/infiniband/hw/mlx5/mlx5_ib.h | 7 +- drivers/infiniband/hw/mlx5/mr.c | 3 +- drivers/infiniband/hw/mlx5/odp.c | 50 +- drivers/xen/Kconfig | 3 +- drivers/xen/gntdev-common.h | 8 +- drivers/xen/gntdev.c | 180 ++---- include/linux/hmm.h | 195 +------ include/linux/mmu_notifier.h | 144 ++++- include/rdma/ib_umem_odp.h | 65 +-- include/rdma/ib_verbs.h | 2 - kernel/fork.c | 1 - mm/Kconfig | 2 +- mm/hmm.c | 275 +-------- mm/mmu_notifier.c | 546 +++++++++++++++++- 32 files changed, 1225 insertions(+), 1922 deletions(-) Tested-by: Ralph Campbell Reviewed-by: Boris Ostrovsky