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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 840BBC433E1 for ; Tue, 30 Jun 2020 19:23:11 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (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 51073206C0 for ; Tue, 30 Jun 2020 19:23:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 51073206C0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=ispras.ru Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 2303688393; Tue, 30 Jun 2020 19:23:11 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kMmKer59WKPr; Tue, 30 Jun 2020 19:23:08 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id D995288516; Tue, 30 Jun 2020 19:23:08 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id C2FFAC0865; Tue, 30 Jun 2020 19:23:08 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 2B288C016E for ; Tue, 30 Jun 2020 19:23:07 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 158FD87943 for ; Tue, 30 Jun 2020 19:23:07 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gJ2UEkwH7iS3 for ; Tue, 30 Jun 2020 19:23:05 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from smtp.ispras.ru (winnie.ispras.ru [83.149.199.91]) by whitealder.osuosl.org (Postfix) with ESMTP id A722287938 for ; Tue, 30 Jun 2020 19:23:03 +0000 (UTC) Received: from monopod.intra.ispras.ru (monopod.intra.ispras.ru [10.10.3.121]) by smtp.ispras.ru (Postfix) with ESMTP id D8065201D0; Tue, 30 Jun 2020 22:22:55 +0300 (MSK) Date: Tue, 30 Jun 2020 22:22:55 +0300 (MSK) From: Alexander Monakov To: Suravee Suthikulpanit Subject: Re: [PATCH] iommu/amd: Fix event counter availability check In-Reply-To: Message-ID: References: <20200529200738.1923-1-amonakov@ispras.ru> <56761139-f794-39b1-4dfa-dfc05fbe5f60@amd.com> User-Agent: Alpine 2.20.13 (LNX 116 2015-12-14) MIME-Version: 1.0 Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Tue, 16 Jun 2020, Suravee Suthikulpanit wrote: > > > On 6/1/20 4:01 PM, Alexander Monakov wrote: > > > > On Mon, 1 Jun 2020, Suravee Suthikulpanit wrote: > > > > > > > > > > Moving init_iommu_perf_ctr just after iommu_flush_all_caches > > > > > > resolves the issue. This is the earliest point in amd_iommu_init_pci > > > > > > where the call succeeds on my laptop. > > > > > According to your description, it should just need to be anywhere > > > > > after the pci_enable_device() is called for the IOMMU device, isn't > > > > > it? So, on your system, what if we just move the init_iommu_perf_ctr() > > > > > here: > > > > No, this doesn't work, as I already said in the paragraph you are > > > > responding to. See my last sentence in the quoted part. > > > > > > > > So the implication is init_device_table_dma together with subsequent > > > > cache flush is also setting up something that is necessary for counters > > > > to be writable. > > > > > > > > Alexander > > > > > > > Instead of blindly moving the code around to a spot that would just work, > > > I am trying to understand what might be required here. In this case, > > > the init_device_table_dma()should not be needed. I suspect it's the IOMMU > > > invalidate all command that's also needed here. > > > > > > I'm also checking with the HW and BIOS team. Meanwhile, could you please > > > give the following change a try: > > Hello. Can you give any update please? > > > > Alexander > > > > Sorry for late reply. I have a reproducer and working with the HW team to > understand the issue. > I should be able to provide update with solution by the end of this week. Hi, can you share any information (two more weeks have passed)? Alexander _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu