Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756712AbbEUTea (ORCPT ); Thu, 21 May 2015 15:34:30 -0400 Received: from mail-qg0-f50.google.com ([209.85.192.50]:35006 "EHLO mail-qg0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756677AbbEUTeW (ORCPT ); Thu, 21 May 2015 15:34:22 -0400 From: j.glisse@gmail.com To: akpm@linux-foundation.org Cc: , linux-mm@kvack.org, Linus Torvalds , , Mel Gorman , "H. Peter Anvin" , Peter Zijlstra , Andrea Arcangeli , Johannes Weiner , Larry Woodman , Rik van Riel , Dave Airlie , Brendan Conoboy , Joe Donohue , Duncan Poole , Sherry Cheung , Subhash Gutti , John Hubbard , Mark Hairgrove , Lucien Dunning , Cameron Buschardt , Arvind Gopalakrishnan , Haggai Eran , Shachar Raindel , Liran Liss , Roland Dreier , Ben Sander , Greg Stoner , John Bridgman , Michael Mantor , Paul Blinzer , Laurent Morichetti , Alexander Deucher , Oded Gabbay , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= Subject: [PATCH 19/36] HMM: handle HMM device page table entry on mirror page table fault and update. Date: Thu, 21 May 2015 15:31:28 -0400 Message-Id: <1432236705-4209-20-git-send-email-j.glisse@gmail.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1432236705-4209-1-git-send-email-j.glisse@gmail.com> References: <1432236705-4209-1-git-send-email-j.glisse@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1336 Lines: 50 From: Jérôme Glisse When faulting or updating the device page table properly handle the case of device memory entry. Signed-off-by: Jérôme Glisse --- mm/hmm.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/mm/hmm.c b/mm/hmm.c index 761905a..e4585b7 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -613,6 +613,13 @@ static void hmm_mirror_update_pte(struct hmm_mirror *mirror, goto out; } + if (hmm_pte_test_valid_dev(hmm_pte)) { + *hmm_pte &= event->pte_mask; + if (!hmm_pte_test_valid_dev(hmm_pte)) + hmm_pt_iter_directory_unref(iter, mirror->pt.llevel); + return; + } + if (!hmm_pte_test_valid_dma(hmm_pte)) return; @@ -813,6 +820,13 @@ static int hmm_mirror_fault_pmd(pmd_t *pmdp, do { next = hmm_pt_level_next(&mirror->pt, addr, hmm_end, mirror->pt.llevel); + + if (hmm_pte_test_valid_dev(&hmm_pte[i])) { + if (write) + hmm_pte_set_write(&hmm_pte[i]); + continue; + } + if (!pte_present(*ptep) || (write && !pte_write(*ptep))) { ret = -ENOENT; ptep++; -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/