From patchwork Wed Jun 12 18:16:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keith Busch X-Patchwork-Id: 13695470 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BA2925FB9B for ; Wed, 12 Jun 2024 18:37:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.145.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718217440; cv=none; b=P1E0DfNabxHbpp1R6BPj8IzaKEPIxLyBYrd1V+M9PnMs30VPBPonmm8wUamEJjFCJsFmXa5C9l8ZW/BV7yfPCQMXKBT+g2ra/ysJ+GbcBplzfSW8MUGFE2LSFqiCz52sEWU/8RtWL5LJyte/N6ZtYRd0KfkL3WsleDpZIuet8iY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718217440; c=relaxed/simple; bh=4EBHqAxy5eCF5IRX5nVf1m0eQyTiWpFPGAIrZ37kmzQ=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=scYCAEU58y+VJGkOY9fdttuB44bYJiZ49srDukjFR9wBY2U1WEMMu0GAgj7B7YXBZ3YQfx0I2LiGrIjlf6QLEM69LQnhB3W3BxQuheFdp1DNmrU0aNljV9VVRrq8TjvOFptmLz/QfCWuSN0aIiC6j9ZxlqIr7/kIloUOKcN84SQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com; spf=pass smtp.mailfrom=meta.com; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b=cK020B3c; arc=none smtp.client-ip=67.231.145.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=meta.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b="cK020B3c" Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 45CHv5H2021936 for ; Wed, 12 Jun 2024 11:37:18 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=cc : content-transfer-encoding : content-type : date : from : message-id : mime-version : subject : to; s=s2048-2021-q4; bh=7e/Ke2u6sTB5fa2kQWQnX5KXkbS3W0FYIu39MwvgQOk=; b=cK020B3cfLb2HD14iNpSBkm+y5Mt3SKZCvaRz1RNmhLepYZckKMYRKiFVAXoEpuW6cuN uxCbXk+nF7SD7R5PcUc6DS1ZDYgcPQk8SNwXo2wVZCEQRlU+tB3YWv9UMu9L+5LnXX5f b0TqluRIm3qu6w3Zpt5dQSfrK9OKA9tMNnQRCB3nUS/cw906xyPk1lY8Y3Tspmk4HyiL zi3selR7rNbWzxhbRYLHvgXgilVRCi0ElldchHix00pI+ocCtRW6fGNKUzbGBGSBXNVO 82h06yphbgBaVZcrvF+Pl7Yl/wUzGM2IbTwcIGnjh7VNQuBGxF2f5Xir9Cw1WMsjg86d jw== Received: from mail.thefacebook.com ([163.114.134.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3ypm8wu6qd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 12 Jun 2024 11:37:17 -0700 Received: from twshared23916.05.ash9.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c08b:78::c78f) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.1544.11; Wed, 12 Jun 2024 18:37:17 +0000 Received: by devbig638.nha1.facebook.com (Postfix, from userid 544533) id 0E42AF5FC61B; Wed, 12 Jun 2024 11:16:30 -0700 (PDT) From: Keith Busch To: , , CC: Keith Busch Subject: [PATCHv2 0/2] pcie hotplug and error fixes Date: Wed, 12 Jun 2024 11:16:23 -0700 Message-ID: <20240612181625.3604512-1-kbusch@meta.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: _f9morF9jqwUZ3v0TKaiib6R1-Jd5w9b X-Proofpoint-ORIG-GUID: _f9morF9jqwUZ3v0TKaiib6R1-Jd5w9b X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-12_09,2024-06-12_02,2024-05-17_01 From: Keith Busch We' failures when dealing with certain overlapping pcie events. The topology is essentially this: [Root Port] <-> [UpStream Port] <-> [DownStream Port] <-> [End Device] An error between the DSP and ED triggers DPC. There's only inband presence detection so it also triggers hotplug. Before the error handling is completed, though, another error seen by the RP triggers its own DPC handling. The concurrent event handling reveals some interesting races, and this patchset tries to address these without fundamentally changing the locking scheme. v1->v2: Fixed compiler error for !CONFIG_PCI (lkp) Keith Busch (2): PCI: pciehp: fix concurrent sub-tree removal deadlock PCI: err: ensure stable topology during handling drivers/pci/hotplug/pciehp_pci.c | 12 +++++++++--- drivers/pci/pci.h | 1 + drivers/pci/pcie/err.c | 8 +++++++- drivers/pci/probe.c | 24 ++++++++++++++++++++++++ include/linux/pci.h | 2 ++ 5 files changed, 43 insertions(+), 4 deletions(-)