From patchwork Wed Jan 23 22:23:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10778029 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 064041515 for ; Wed, 23 Jan 2019 22:24:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EC41D2C4E4 for ; Wed, 23 Jan 2019 22:24:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E05352C4FE; Wed, 23 Jan 2019 22:24:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7ECFA2C4F8 for ; Wed, 23 Jan 2019 22:24:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727301AbfAWWXv (ORCPT ); Wed, 23 Jan 2019 17:23:51 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57982 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727271AbfAWWXr (ORCPT ); Wed, 23 Jan 2019 17:23:47 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 61CC618DF61; Wed, 23 Jan 2019 22:23:46 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-120-127.rdu2.redhat.com [10.10.120.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id B5EAC5D965; Wed, 23 Jan 2019 22:23:43 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 6/9] gpu/drm/radeon: optimize out the case when a range is updated to read only Date: Wed, 23 Jan 2019 17:23:12 -0500 Message-Id: <20190123222315.1122-7-jglisse@redhat.com> In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com> References: <20190123222315.1122-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 23 Jan 2019 22:23:46 +0000 (UTC) Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse When range of virtual address is updated read only and corresponding user ptr object are already read only it is pointless to do anything. Optimize this case out. Signed-off-by: Jérôme Glisse Cc: Christian König Cc: Jan Kara Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Arnd Bergmann --- drivers/gpu/drm/radeon/radeon_mn.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c index b3019505065a..f77294f58e63 100644 --- a/drivers/gpu/drm/radeon/radeon_mn.c +++ b/drivers/gpu/drm/radeon/radeon_mn.c @@ -124,6 +124,7 @@ static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn, struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); struct ttm_operation_ctx ctx = { false, false }; struct interval_tree_node *it; + bool update_to_read_only; unsigned long end; int ret = 0; @@ -138,6 +139,8 @@ static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn, else if (!mutex_trylock(&rmn->lock)) return -EAGAIN; + update_to_read_only = mmu_notifier_range_update_to_read_only(range); + it = interval_tree_iter_first(&rmn->objects, range->start, end); while (it) { struct radeon_mn_node *node; @@ -153,10 +156,20 @@ static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn, it = interval_tree_iter_next(it, range->start, end); list_for_each_entry(bo, &node->bos, mn_list) { + bool read_only; if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound) continue; + /* + * If it is already read only and we are updating to + * read only then we do not need to change anything. + * So save time and skip this one. + */ + read_only = radeon_ttm_tt_is_readonly(bo->tbo.ttm); + if (update_to_read_only && read_only) + continue; + r = radeon_bo_reserve(bo, true); if (r) { DRM_ERROR("(%ld) failed to reserve user bo\n", r);