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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EAB97C433EF for ; Tue, 29 Mar 2022 08:32:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232723AbiC2IeI (ORCPT ); Tue, 29 Mar 2022 04:34:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231682AbiC2IeH (ORCPT ); Tue, 29 Mar 2022 04:34:07 -0400 Received: from smtp-relay-canonical-1.canonical.com (smtp-relay-canonical-1.canonical.com [185.125.188.121]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C643B53D4; Tue, 29 Mar 2022 01:32:24 -0700 (PDT) Received: from localhost.localdomain (unknown [10.101.196.174]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 9AB4E3F918; Tue, 29 Mar 2022 08:32:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1648542738; bh=Vg3Q2yq7R1CIQy/iqqvjMlUxdzmmBWbHqayjoyMJYKs=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=gv7Ve5I0ONbs5ye5+ZxZatcUohCJiXDEWNhh4GsecV2yfzms1rGF00OW24ycY/khb 6UPjI/dQ9fmR/cDWoXnsaxIEOROV3bfxGxbNfTyXCq6G0mnl6pP3K5UNErvpMuZGEd EZoQ0Q/S/ngFXMpSuvtCTfI7VbdQdhtMGS+BYcS22RULAKxnoFtZGo4x1cYz4RDL+q rbDubNv+Ai89d3kzEOYAtsB/oJ/Eg78+eOTPASfDRsIDLw8DVnAwMi7pYpxYH09Xhf mqt7kqSCs+2vFAkCmKphN1mXNuATwAHAHVu93Y1ivNAeIoa+rRDcCEdhOtMyUBUrk4 Z1pDxTQeXFjCA== From: Kai-Heng Feng To: bhelgaas@google.com Cc: mika.westerberg@linux.intel.com, koba.ko@canonical.com, baolu.lu@linux.intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, Kai-Heng Feng , Russell Currey , "Oliver O'Halloran" , linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/2] PCI/AER: Disable AER service when link is in L2/L3 ready, L2 and L3 state Date: Tue, 29 Mar 2022 16:31:28 +0800 Message-Id: <20220329083130.817316-1-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On some Intel AlderLake platforms, Thunderbolt entering D3cold can cause some errors reported by AER: [ 30.100211] pcieport 0000:00:1d.0: AER: Uncorrected (Non-Fatal) error received: 0000:00:1d.0 [ 30.100251] pcieport 0000:00:1d.0: PCIe Bus Error: severity=Uncorrected (Non-Fatal), type=Transaction Layer, (Requester ID) [ 30.100256] pcieport 0000:00:1d.0: device [8086:7ab0] error status/mask=00100000/00004000 [ 30.100262] pcieport 0000:00:1d.0: [20] UnsupReq (First) [ 30.100267] pcieport 0000:00:1d.0: AER: TLP Header: 34000000 08000052 00000000 00000000 [ 30.100372] thunderbolt 0000:0a:00.0: AER: can't recover (no error_detected callback) [ 30.100401] xhci_hcd 0000:3e:00.0: AER: can't recover (no error_detected callback) [ 30.100427] pcieport 0000:00:1d.0: AER: device recovery failed So disable AER service to avoid the noises from turning power rails on/off when the device is in low power states (D3hot and D3cold), as PCIe spec "5.2 Link State Power Management" states that TLP and DLLP transmission is disabled for a Link in L2/L3 Ready (D3hot), L2 (D3cold with aux power) and L3 (D3cold). Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215453 Reviewed-by: Mika Westerberg Signed-off-by: Kai-Heng Feng --- v3: - Remove reference to ACS. - Wording change. v2: - Wording change. drivers/pci/pcie/aer.c | 31 +++++++++++++++++++++++++------ 1 file changed, 25 insertions(+), 6 deletions(-) diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index 9fa1f97e5b270..e4e9d4a3098d7 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -1367,6 +1367,22 @@ static int aer_probe(struct pcie_device *dev) return 0; } +static int aer_suspend(struct pcie_device *dev) +{ + struct aer_rpc *rpc = get_service_data(dev); + + aer_disable_rootport(rpc); + return 0; +} + +static int aer_resume(struct pcie_device *dev) +{ + struct aer_rpc *rpc = get_service_data(dev); + + aer_enable_rootport(rpc); + return 0; +} + /** * aer_root_reset - reset Root Port hierarchy, RCEC, or RCiEP * @dev: pointer to Root Port, RCEC, or RCiEP @@ -1433,12 +1449,15 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) } static struct pcie_port_service_driver aerdriver = { - .name = "aer", - .port_type = PCIE_ANY_PORT, - .service = PCIE_PORT_SERVICE_AER, - - .probe = aer_probe, - .remove = aer_remove, + .name = "aer", + .port_type = PCIE_ANY_PORT, + .service = PCIE_PORT_SERVICE_AER, + .probe = aer_probe, + .suspend = aer_suspend, + .resume = aer_resume, + .runtime_suspend = aer_suspend, + .runtime_resume = aer_resume, + .remove = aer_remove, }; /** -- 2.34.1