From patchwork Wed Jul 3 20:29:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 1127152 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45fCTt6tfhz9s4V for ; Thu, 4 Jul 2019 06:32:50 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727270AbfGCUcT (ORCPT ); Wed, 3 Jul 2019 16:32:19 -0400 Received: from mga04.intel.com ([192.55.52.120]:60930 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726550AbfGCUcT (ORCPT ); Wed, 3 Jul 2019 16:32:19 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Jul 2019 13:32:18 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,448,1557212400"; d="scan'208";a="158089410" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by orsmga008.jf.intel.com with ESMTP; 03 Jul 2019 13:32:18 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, "Rafael J. Wysocki" , Len Brown Subject: [PATCH v4 2/8] PCI/ACPI: Expose EDR support via _OSC to BIOS Date: Wed, 3 Jul 2019 13:29:49 -0700 Message-Id: <345e16361762a8d047a32a1380877dc0f2909559.1562185606.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Kuppuswamy Sathyanarayanan As per PCI firmware specification r3.2 Downstream Port Containment Related Enhancements ECN, sec 4.5.1, table 4-4, if OS supports EDR, it should expose its support to BIOS by setting bit 7 of _OSC Support Field. Cc: Bjorn Helgaas Cc: "Rafael J. Wysocki" Cc: Len Brown Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/acpi/pci_root.c | 3 +++ include/linux/acpi.h | 1 + 2 files changed, 4 insertions(+) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index fa35c2b5b998..361f8b177c6c 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -132,6 +132,7 @@ static struct pci_osc_bit_struct pci_osc_support_bit[] = { { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, { OSC_PCI_MSI_SUPPORT, "MSI" }, + { OSC_PCI_EDR_SUPPORT, "EDR" }, { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" }, }; @@ -442,6 +443,8 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; if (pci_msi_enabled()) support |= OSC_PCI_MSI_SUPPORT; + if (IS_ENABLED(CONFIG_PCIE_EDR)) + support |= OSC_PCI_EDR_SUPPORT; decode_osc_support(root, "OS supports", support); status = acpi_pci_osc_support(root, support); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 61ab40bff45c..24ac0435ef3b 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -504,6 +504,7 @@ extern bool osc_pc_lpi_support_confirmed; #define OSC_PCI_CLOCK_PM_SUPPORT 0x00000004 #define OSC_PCI_SEGMENT_GROUPS_SUPPORT 0x00000008 #define OSC_PCI_MSI_SUPPORT 0x00000010 +#define OSC_PCI_EDR_SUPPORT 0x00000080 #define OSC_PCI_HPX_TYPE_3_SUPPORT 0x00000100 #define OSC_PCI_SUPPORT_MASKS 0x0000011f