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[213.80.101.71]) by mx.google.com with ESMTPS id e9si14562563ljk.132.2019.06.11.23.43.28 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 11 Jun 2019 23:43:28 -0700 (PDT) Received-SPF: pass (google.com: domain of thellstrom@vmwopensource.org designates 213.80.101.71 as permitted sender) client-ip=213.80.101.71; Authentication-Results: mx.google.com; dkim=pass header.i=@vmwopensource.org header.s=mail header.b=eeOw22qy; spf=pass (google.com: domain of thellstrom@vmwopensource.org designates 213.80.101.71 as permitted sender) smtp.mailfrom=thellstrom@vmwopensource.org Received: from localhost (localhost [127.0.0.1]) by ste-pvt-msa2.bahnhof.se (Postfix) with ESMTP id 706333F771; Wed, 12 Jun 2019 08:43:10 +0200 (CEST) Authentication-Results: ste-pvt-msa2.bahnhof.se; dkim=pass (1024-bit key; unprotected) header.d=vmwopensource.org header.i=@vmwopensource.org header.b=eeOw22qy; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at bahnhof.se Authentication-Results: ste-ftg-msa2.bahnhof.se (amavisd-new); dkim=pass (1024-bit key) header.d=vmwopensource.org Received: from ste-pvt-msa2.bahnhof.se ([127.0.0.1]) by localhost (ste-ftg-msa2.bahnhof.se [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eN_KM0t7dhF0; Wed, 12 Jun 2019 08:42:56 +0200 (CEST) Received: from mail1.shipmail.org (h-205-35.A357.priv.bahnhof.se [155.4.205.35]) (Authenticated sender: mb878879) by ste-pvt-msa2.bahnhof.se (Postfix) with ESMTPA id 780233F708; Wed, 12 Jun 2019 08:42:55 +0200 (CEST) Received: from localhost.localdomain.localdomain (h-205-35.A357.priv.bahnhof.se [155.4.205.35]) by mail1.shipmail.org (Postfix) with ESMTPSA id E0884361B6A; Wed, 12 Jun 2019 08:42:54 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=vmwopensource.org; s=mail; t=1560321775; bh=Yjmtl92sLAlEoB99F5XOnCklObajAbb4hpy0froOh7I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eeOw22qyp5zCYVRoM/flnXFq8CVLDiTHGne8tBYD5h07U6ysR3JsuLgcA17isFPZK L287x8k3sc6DRFwmYDPnxXTZMr03rF/Y4LtPDq4v5PRWhisSkqsidnDs4iiubpxtZR NQ7I0hIgw0DO0H2J//GflKMp0Tz7Xoxsxk+S6F9Y= From: =?UTF-8?q?Thomas=20Hellstr=C3=B6m=20=28VMware=29?= To: dri-devel@lists.freedesktop.org Cc: linux-graphics-maintainer@vmware.com, pv-drivers@vmware.com, linux-kernel@vger.kernel.org, nadav.amit@gmail.com, Thomas Hellstrom , Andrew Morton , Matthew Wilcox , Will Deacon , Peter Zijlstra , Rik van Riel , Minchan Kim , Michal Hocko , Huang Ying , Souptick Joarder , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , linux-mm@kvack.org, Ralph Campbell Subject: [PATCH v5 1/9] mm: Allow the [page|pfn]_mkwrite callbacks to drop the mmap_sem Date: Wed, 12 Jun 2019 08:42:35 +0200 Message-Id: <20190612064243.55340-2-thellstrom@vmwopensource.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190612064243.55340-1-thellstrom@vmwopensource.org> References: <20190612064243.55340-1-thellstrom@vmwopensource.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Thomas Hellstrom Driver fault callbacks are allowed to drop the mmap_sem when expecting long hardware waits to avoid blocking other mm users. Allow the mkwrite callbacks to do the same by returning early on VM_FAULT_RETRY. In particular we want to be able to drop the mmap_sem when waiting for a reservation object lock on a GPU buffer object. These locks may be held while waiting for the GPU. Cc: Andrew Morton Cc: Matthew Wilcox Cc: Will Deacon Cc: Peter Zijlstra Cc: Rik van Riel Cc: Minchan Kim Cc: Michal Hocko Cc: Huang Ying Cc: Souptick Joarder Cc: "Jérôme Glisse" Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Thomas Hellstrom Reviewed-by: Ralph Campbell --- mm/memory.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index ddf20bd0c317..168f546af1ad 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2238,7 +2238,7 @@ static vm_fault_t do_page_mkwrite(struct vm_fault *vmf) ret = vmf->vma->vm_ops->page_mkwrite(vmf); /* Restore original flags so that caller is not surprised */ vmf->flags = old_flags; - if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE))) + if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY))) return ret; if (unlikely(!(ret & VM_FAULT_LOCKED))) { lock_page(page); @@ -2515,7 +2515,7 @@ static vm_fault_t wp_pfn_shared(struct vm_fault *vmf) pte_unmap_unlock(vmf->pte, vmf->ptl); vmf->flags |= FAULT_FLAG_MKWRITE; ret = vma->vm_ops->pfn_mkwrite(vmf); - if (ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)) + if (ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)) return ret; return finish_mkwrite_fault(vmf); } @@ -2536,7 +2536,8 @@ static vm_fault_t wp_page_shared(struct vm_fault *vmf) pte_unmap_unlock(vmf->pte, vmf->ptl); tmp = do_page_mkwrite(vmf); if (unlikely(!tmp || (tmp & - (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) { + (VM_FAULT_ERROR | VM_FAULT_NOPAGE | + VM_FAULT_RETRY)))) { put_page(vmf->page); return tmp; } @@ -3601,7 +3602,8 @@ static vm_fault_t do_shared_fault(struct vm_fault *vmf) unlock_page(vmf->page); tmp = do_page_mkwrite(vmf); if (unlikely(!tmp || - (tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) { + (tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | + VM_FAULT_RETRY)))) { put_page(vmf->page); return tmp; } -- 2.20.1