From mboxrd@z Thu Jan 1 00:00:00 1970 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=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=ham 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 5F02EECE588 for ; Tue, 15 Oct 2019 18:17:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 310F22245A for ; Tue, 15 Oct 2019 18:17:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="AaI6zcoX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731834AbfJOSQf (ORCPT ); Tue, 15 Oct 2019 14:16:35 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:43725 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726597AbfJOSQe (ORCPT ); Tue, 15 Oct 2019 14:16:34 -0400 Received: by mail-pg1-f195.google.com with SMTP id i32so12612263pgl.10 for ; Tue, 15 Oct 2019 11:16:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=F2P8/bWutEEexpXtgY3Ri54G2hYwzd51MYRSkoxVUFY=; b=AaI6zcoXb9y8wHRXAkK1VS7bCrbUdWouuVyY6gjZrKTtcQT1f9NTbxZoCGV2igOt58 Hoknkm4WnIkfuQk9Rp9K15Dz/ZC1/p916c32tuqr/CGeXCXN4z8DPNSjznQTdigjjDl3 gatSw9oqkyrSqTGQ3r3g6s47kZTtPeEnB3akei3bsWFCnbAKc65GcpRB8NGeBsGmst80 TNz3kgeYGq0EAH8hHALVUUXDSXUCc7+/icuPT8zmQDmwvqR37fPXC3iFYLqPPzHYJLWr IRmCNEVjik9lbYHEDBdg+ayNFKX79wsrhJv+tgs3ucEqbgNZP4YTOzO2R9UKFWjGbCVL mxNQ== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=F2P8/bWutEEexpXtgY3Ri54G2hYwzd51MYRSkoxVUFY=; b=IEKxlOC+b9NNUh6eBy5v3Vvh5riHIMCheICPxUylVZUTDkWuKnrgFCx/OwfSyg1Km1 BWrftnoA3JmeS/HKXmfSlUGq46mmpfUrdJ7CqOzfCzRAoV24VGRcu6bdTpWeBPeXd/9s Gd667uYou8jopVahWCWjy2LuPOAsS7Q/dVqfRB9QrhYS23uqgxleKHxvO5cyW46O4Qup sk4tU7a5qjM4yEeBzVEPQpsiM/pKLQlE/2o1QdHQfmAPAdHBQIUDPnf7JYz73zqD6UWK 21kiqlmjhBIKGUeQlcaL6FapuyH3hpcCQG+3ZMSZPLoGgXxt+QcwsqZBpScJCG2ZeACd k/bg== X-Gm-Message-State: APjAAAV4c701MpWiNE/nxmgEroyiI19frzFnvC940Ok7Jz60sVcsI6tt fDrfOzloKMMNVV7WXafAtpBbYw== X-Google-Smtp-Source: APXvYqwvtUQJH3GpUYBytG2xLT5sSPQT5rLCc3Ie8xi2zPK4TIkuo6wjteJGwDYGFUM1QCJsNVRHNQ== X-Received: by 2002:a62:5ec6:: with SMTP id s189mr39679838pfb.169.1571163394083; Tue, 15 Oct 2019 11:16:34 -0700 (PDT) Received: from ziepe.ca ([24.114.26.129]) by smtp.gmail.com with ESMTPSA id o15sm14016pjs.14.2019.10.15.11.16.33 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 15 Oct 2019 11:16:33 -0700 (PDT) Received: from jgg by jggl.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1iKRJT-0002Cf-NJ; Tue, 15 Oct 2019 15:12:51 -0300 From: Jason Gunthorpe To: Jerome Glisse , Ralph Campbell , John Hubbard , Felix.Kuehling@amd.com Cc: linux-rdma@vger.kernel.org, linux-mm@kvack.org, Andrea Arcangeli , dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, Ben Skeggs , Jason Gunthorpe , Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , David Zhou Subject: [PATCH hmm 12/15] drm/amdgpu: Call find_vma under mmap_sem Date: Tue, 15 Oct 2019 15:12:39 -0300 Message-Id: <20191015181242.8343-13-jgg@ziepe.ca> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191015181242.8343-1-jgg@ziepe.ca> References: <20191015181242.8343-1-jgg@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Jason Gunthorpe find_vma() must be called under the mmap_sem, reorganize this code to do the vma check after entering the lock. Further, fix the unlocked use of struct task_struct's mm, instead use the mm from hmm_mirror which has an active mm_grab. Also the mm_grab must be converted to a mm_get before acquiring mmap_sem or calling find_vma(). Fixes: 66c45500bfdc ("drm/amdgpu: use new HMM APIs and helpers") Fixes: 0919195f2b0d ("drm/amdgpu: Enable amdgpu_ttm_tt_get_user_pages in worker threads") Cc: Alex Deucher Cc: Christian König Cc: David (ChunMing) Zhou Cc: amd-gfx@lists.freedesktop.org Signed-off-by: Jason Gunthorpe --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 37 ++++++++++++++----------- 1 file changed, 21 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index dff41d0a85fe96..c0e41f1f0c2365 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include #include @@ -788,7 +789,7 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages) struct hmm_mirror *mirror = bo->mn ? &bo->mn->mirror : NULL; struct ttm_tt *ttm = bo->tbo.ttm; struct amdgpu_ttm_tt *gtt = (void *)ttm; - struct mm_struct *mm = gtt->usertask->mm; + struct mm_struct *mm; unsigned long start = gtt->userptr; struct vm_area_struct *vma; struct hmm_range *range; @@ -796,25 +797,14 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages) uint64_t *pfns; int r = 0; - if (!mm) /* Happens during process shutdown */ - return -ESRCH; - if (unlikely(!mirror)) { DRM_DEBUG_DRIVER("Failed to get hmm_mirror\n"); - r = -EFAULT; - goto out; + return -EFAULT; } - vma = find_vma(mm, start); - if (unlikely(!vma || start < vma->vm_start)) { - r = -EFAULT; - goto out; - } - if (unlikely((gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) && - vma->vm_file)) { - r = -EPERM; - goto out; - } + mm = mirror->hmm->mmu_notifier.mm; + if (!mmget_not_zero(mm)) /* Happens during process shutdown */ + return -ESRCH; range = kzalloc(sizeof(*range), GFP_KERNEL); if (unlikely(!range)) { @@ -847,6 +837,17 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages) hmm_range_wait_until_valid(range, HMM_RANGE_DEFAULT_TIMEOUT); down_read(&mm->mmap_sem); + vma = find_vma(mm, start); + if (unlikely(!vma || start < vma->vm_start)) { + r = -EFAULT; + goto out_unlock; + } + if (unlikely((gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) && + vma->vm_file)) { + r = -EPERM; + goto out_unlock; + } + r = hmm_range_fault(range, 0); up_read(&mm->mmap_sem); @@ -865,15 +866,19 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages) } gtt->range = range; + mmput(mm); return 0; +out_unlock: + up_read(&mm->mmap_sem); out_free_pfns: hmm_range_unregister(range); kvfree(pfns); out_free_ranges: kfree(range); out: + mmput(mm); return r; } -- 2.23.0