From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754580AbdFWQwr (ORCPT ); Fri, 23 Jun 2017 12:52:47 -0400 Received: from mga09.intel.com ([134.134.136.24]:50505 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752116AbdFWQwq (ORCPT ); Fri, 23 Jun 2017 12:52:46 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.39,379,1493708400"; d="scan'208";a="100881666" From: Rajneesh Bhardwaj To: platform-driver-x86@vger.kernel.org Cc: dvhart@infradead.org, andy@infradead.org, linux-kernel@vger.kernel.org, shanth.murthy@intel.com, souvik.k.chakravarty@intel.com, Rajneesh Bhardwaj Subject: [PATCH v2] x86/intel_telemetry: Add debugfs entry for S0ix residency Date: Fri, 23 Jun 2017 22:22:35 +0530 Message-Id: <1498236755-30763-1-git-send-email-rajneesh.bhardwaj@intel.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds a debugfs consumer for the exported kernel API intel_pmc_read_s0ix_residency. This debugfs entry reads S0ix residency directly from the PMC hardware counters. TEST: - echo freeze > /sys/power/state - Wake the system, read the S0ix residency i.e. cat /sys/kernel/debug/telemetry/s0ix_residency_usec Signed-off-by: Shanth Murthy Signed-off-by: Rajneesh Bhardwaj --- Changes in v2: * Fixed typo in pr_err :- Changed s0ix_residency_us to s0ix_residency_usec * Minor change w.r.t s0ix_total_res variable declaration drivers/platform/x86/intel_telemetry_debugfs.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/platform/x86/intel_telemetry_debugfs.c b/drivers/platform/x86/intel_telemetry_debugfs.c index efc0140..a4267b8 100644 --- a/drivers/platform/x86/intel_telemetry_debugfs.c +++ b/drivers/platform/x86/intel_telemetry_debugfs.c @@ -713,6 +713,24 @@ static int telem_soc_state_open(struct inode *inode, struct file *file) .release = single_release, }; +static int telem_s0ix_res_get(void *data, u64 *val) +{ + u64 s0ix_total_res; + int ret; + + ret = intel_pmc_s0ix_counter_read(&s0ix_total_res); + if (ret) { + pr_err("Failed to read S0ix residency"); + return ret; + } + + *val = s0ix_total_res; + + return 0; +} + +DEFINE_DEBUGFS_ATTRIBUTE(telem_s0ix_fops, telem_s0ix_res_get, NULL, "%llu\n"); + static int telem_pss_trc_verb_show(struct seq_file *s, void *unused) { u32 verbosity; @@ -994,6 +1012,14 @@ static int __init telemetry_debugfs_init(void) goto out; } + f = debugfs_create_file("s0ix_residency_usec", S_IFREG | S_IRUGO, + debugfs_conf->telemetry_dbg_dir, + NULL, &telem_s0ix_fops); + if (!f) { + pr_err("s0ix_residency_usec debugfs register failed\n"); + goto out; + } + f = debugfs_create_file("pss_trace_verbosity", S_IFREG | S_IRUGO, debugfs_conf->telemetry_dbg_dir, NULL, &telem_pss_trc_verb_ops); -- 1.9.1