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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 94487CA9EA0 for ; Fri, 25 Oct 2019 13:57:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6872E21E6F for ; Fri, 25 Oct 2019 13:57:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572011848; bh=iSQuWSmQqaWR/fDuDtLQOvdfWS2yJE5pw+hTI+ELux8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=011RC+zZeEgPmQja98CBxj8CTyOrr0jSpq9HPIksNPs913WNGfkL0JKiXWBuvW6q4 zcTx/HVZ7OYTQNWZogTB7ju911iBipRmyC9Z1N3oqRMkBFJsteCHmEoc/+JU8tEB2G lKOHFliQhksRrIZi7wCABv0H8SSX3eQnch3fromM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2505318AbfJYN50 (ORCPT ); Fri, 25 Oct 2019 09:57:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:52162 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393513AbfJYN5X (ORCPT ); Fri, 25 Oct 2019 09:57:23 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id F1949222C2; Fri, 25 Oct 2019 13:57:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572011842; bh=iSQuWSmQqaWR/fDuDtLQOvdfWS2yJE5pw+hTI+ELux8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BTaixi9yAb9pB6SGGVnBhMcANzaU7EU13YtWBGR5Rfs6gdnnVePH9BMh3nKGCDmw6 pFCELcTDVA4swDRIuGTVZvqxftptueYqQqYn5AH58SPxkz2l2I1VjxsKXbvS752xGA Htz6Pqn/O32bj84hqn/AxXzzObZJGb2gWsvL1ivk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Keith Busch , Logan Gunthorpe , Christoph Hellwig , Jens Axboe , Sasha Levin , linux-nvme@lists.infradead.org Subject: [PATCH AUTOSEL 4.14 05/25] nvme-pci: fix conflicting p2p resource adds Date: Fri, 25 Oct 2019 09:56:53 -0400 Message-Id: <20191025135715.25468-5-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191025135715.25468-1-sashal@kernel.org> References: <20191025135715.25468-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Keith Busch [ Upstream commit 9fe5c59ff6a1e5e26a39b75489a1420e7eaaf0b1 ] The nvme pci driver had been adding its CMB resource to the P2P DMA subsystem everytime on on a controller reset. This results in the following warning: ------------[ cut here ]------------ nvme 0000:00:03.0: Conflicting mapping in same section WARNING: CPU: 7 PID: 81 at kernel/memremap.c:155 devm_memremap_pages+0xa6/0x380 ... Call Trace: pci_p2pdma_add_resource+0x153/0x370 nvme_reset_work+0x28c/0x17b1 [nvme] ? add_timer+0x107/0x1e0 ? dequeue_entity+0x81/0x660 ? dequeue_entity+0x3b0/0x660 ? pick_next_task_fair+0xaf/0x610 ? __switch_to+0xbc/0x410 process_one_work+0x1cf/0x350 worker_thread+0x215/0x3d0 ? process_one_work+0x350/0x350 kthread+0x107/0x120 ? kthread_park+0x80/0x80 ret_from_fork+0x1f/0x30 ---[ end trace f7ea76ac6ee72727 ]--- nvme nvme0: failed to register the CMB This patch fixes this by registering the CMB with P2P only once. Signed-off-by: Keith Busch Reviewed-by: Logan Gunthorpe Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/nvme/host/pci.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index cd11cced36781..5f820c784a7e8 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1546,6 +1546,9 @@ static void __iomem *nvme_map_cmb(struct nvme_dev *dev) void __iomem *cmb; int bar; + if (dev->cmb_size) + return; + dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); if (!(NVME_CMB_SZ(dev->cmbsz))) return NULL; @@ -2034,7 +2037,6 @@ static void nvme_pci_disable(struct nvme_dev *dev) { struct pci_dev *pdev = to_pci_dev(dev->dev); - nvme_release_cmb(dev); pci_free_irq_vectors(pdev); if (pci_is_enabled(pdev)) { @@ -2437,6 +2439,7 @@ static void nvme_remove(struct pci_dev *pdev) nvme_stop_ctrl(&dev->ctrl); nvme_remove_namespaces(&dev->ctrl); nvme_dev_disable(dev, true); + nvme_release_cmb(dev); nvme_free_host_mem(dev); nvme_dev_remove_admin(dev); nvme_free_queues(dev, 0); -- 2.20.1