From patchwork Tue Jun 11 01:09:59 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "David E. Box" X-Patchwork-Id: 250433 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 235732C0095 for ; Tue, 11 Jun 2013 11:11:41 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754079Ab3FKBLj (ORCPT ); Mon, 10 Jun 2013 21:11:39 -0400 Received: from mga02.intel.com ([134.134.136.20]:19976 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753472Ab3FKBLj (ORCPT ); Mon, 10 Jun 2013 21:11:39 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 10 Jun 2013 18:11:37 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,841,1363158000"; d="scan'208";a="351409806" Received: from pathfinder.jf.intel.com ([10.7.199.145]) by orsmga002.jf.intel.com with ESMTP; 10 Jun 2013 18:11:36 -0700 From: "David E. Box" To: mj@ucw.cz Cc: kristen.c.accardi@intel.com, linux-pci@vger.kernel.org, David Box Subject: [PATCH v3] lspci: Add L1 PM Substate capability reporting Date: Mon, 10 Jun 2013 18:09:59 -0700 Message-Id: <1370912999-11261-1-git-send-email-david.e.box@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: References: Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: David Box Expose available L1 substate capabilities that can enable lower power consumption when a PCIe Link is idle. Signed-off-by: David Box --- v3: reformatted to match document coding style Sample lspci -vvxxxx output showing first 8 bytes of extended config space for the L1 Substate Capability. Cannot show more since hardware is unreleased: 00:1c.0 PCI bridge: Capabilities: [200 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+, PCI-PM_L1.1+, ASPM_L1.2+, ASPM_L1.1+, L1_PM_Substates+ PortCommonModeRestoreTime=40us, PortTPowerOnTime=10us 200: 1e 00 01 00 1f 28 28 00 lib/header.h | 1 + ls-ecaps.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 56 insertions(+) diff --git a/lib/header.h b/lib/header.h index 69518fd..6608003 100644 --- a/lib/header.h +++ b/lib/header.h @@ -226,6 +226,7 @@ #define PCI_EXT_CAP_ID_SRIOV 0x10 /* Single Root I/O Virtualization */ #define PCI_EXT_CAP_ID_TPH 0x17 /* Transaction processing hints */ #define PCI_EXT_CAP_ID_LTR 0x18 /* Latency Tolerance Reporting */ +#define PCI_EXT_CAP_ID_L1PM 0x1e /* L1 PM Substates */ /*** Definitions of capabilities ***/ diff --git a/ls-ecaps.c b/ls-ecaps.c index 161c275..1a9b6c5 100644 --- a/ls-ecaps.c +++ b/ls-ecaps.c @@ -448,6 +448,58 @@ cap_evendor(struct device *d, int where) BITS(hdr, 20, 12)); } +static void +cap_l1pm(struct device *d, int where) +{ + u32 l1_cap; + int power_on_scale; + + printf("L1 PM Substates\n"); + + if (verbose < 2) + return; + + if (!config_fetch(d, where + 4, 4)) + { + printf("\t\t\n"); + return; + } + + l1_cap = get_conf_long(d, where + 4); + printf("\t\tL1SubCap: "); + printf("PCI-PM_L1.2%c, PCI-PM_L1.1%c, ASPM_L1.2%c, ASPM_L1.1%c, L1_PM_Substates%c\n", + FLAG(l1_cap, 1), + FLAG(l1_cap, 2), + FLAG(l1_cap, 4), + FLAG(l1_cap, 8), + FLAG(l1_cap, 16)); + + if (BITS(l1_cap, 0, 1) || BITS(l1_cap, 2, 1)) + { + printf("\t\t\t PortCommonModeRestoreTime=%dus, ", + BITS(l1_cap, 8,8)); + + power_on_scale = BITS(l1_cap, 16, 2); + + printf("PortTPowerOnTime="); + switch (power_on_scale) + { + case 0: + printf("%dus\n", BITS(l1_cap, 19, 5) * 2); + break; + case 1: + printf("%dus\n", BITS(l1_cap, 19, 5) * 10); + break; + case 2: + printf("%dus\n", BITS(l1_cap, 19, 5) * 100); + break; + default: + printf("\n"); + break; + } + } +} + void show_ext_caps(struct device *d) { @@ -526,6 +578,9 @@ show_ext_caps(struct device *d) case PCI_EXT_CAP_ID_LTR: cap_ltr(d, where); break; + case PCI_EXT_CAP_ID_L1PM: + cap_l1pm(d, where); + break; default: printf("#%02x\n", id); break;