From patchwork Wed Feb 15 20:05:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 13142144 X-Patchwork-Delegate: bhelgaas@google.com 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 A1937C636CC for ; Wed, 15 Feb 2023 20:05:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229741AbjBOUFk (ORCPT ); Wed, 15 Feb 2023 15:05:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33256 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229644AbjBOUFk (ORCPT ); Wed, 15 Feb 2023 15:05:40 -0500 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F9443A842; Wed, 15 Feb 2023 12:05:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1676491539; x=1708027539; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=42e2UJ+iAsNqiNqS5lhTz8+flRIvdRigNev83/sdLZM=; b=M/yRUw1WugA6FUPlZumlxN8gY5+JJ26ssslNXUU2mIC2+zWVHJ3ko6/Y qSuokorPINyIYICADNnarsWMdegNrLrSETtGxvLvvE+ei23CcwkuEEtRE 4yqsIW3NAvbavWfWZwNdQslzATymZ6PD2D9LQGMkZQnbJP+D5aD/079wf 25GXjvdqVR0qEPCXTPm4FuCQj15cgUeoQYw07oS2m1w4i0xqGdDtWUozi 2qy/grXLcI0XRmMjnxFR0lqLWlansGCW4WjMcuGZnRIXgl05Dvrmp1Nij N/IQNMJI0dgg8rmbizsJP/cgij5PKxGyh/dt4FjmAqcZUmeVcbbIN2q/i Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10622"; a="331528151" X-IronPort-AV: E=Sophos;i="5.97,300,1669104000"; d="scan'208";a="331528151" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2023 12:05:38 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10622"; a="663152992" X-IronPort-AV: E=Sophos;i="5.97,300,1669104000"; d="scan'208";a="663152992" Received: from amanjini-mobl.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.209.48.74]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2023 12:05:38 -0800 From: Kuppuswamy Sathyanarayanan To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Kuppuswamy Sathyanarayanan Subject: [PATCH v1] PCI/EDR: Clear PCIe Device Status errors after EDR error recovery Date: Wed, 15 Feb 2023 12:05:32 -0800 Message-Id: <20230215200532.3126937-1-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Commit 068c29a248b6 ("PCI/ERR: Clear PCIe Device Status errors only if OS owns AER") adds support to clear error status in the Device Status Register(DEVSTA) only if OS owns the AER support. But this change breaks the requirement of the EDR feature which requires OS to cleanup the error registers even if firmware owns the control of AER support. More details about this requirement can be found in PCIe Firmware specification v3.3, Table 4-6 Interpretation of the _OSC Control Field. If the OS supports the Error Disconnect Recover (EDR) feature and firmware sends the EDR event, then during the EDR recovery window, OS is responsible for the device error recovery and holds the ownership of the following error registers. • Device Status Register • Uncorrectable Error Status Register • Correctable Error Status Register • Root Error Status Register • RP PIO Status Register So call pcie_clear_device_status() in edr_handle_event() if the error recovery is successful. Reported-by: Tsaur Erwin Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/pci/pcie/edr.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pci/pcie/edr.c b/drivers/pci/pcie/edr.c index a6b9b479b97a..33d7776ea748 100644 --- a/drivers/pci/pcie/edr.c +++ b/drivers/pci/pcie/edr.c @@ -193,6 +193,7 @@ static void edr_handle_event(acpi_handle handle, u32 event, void *data) */ if (estate == PCI_ERS_RESULT_RECOVERED) { pci_dbg(edev, "DPC port successfully recovered\n"); + pcie_clear_device_status(dev); acpi_send_edr_status(pdev, edev, EDR_OST_SUCCESS); } else { pci_dbg(edev, "DPC port recovery failed\n");