From bc8c47abd486014aae543ecdea59554f098df9df Mon Sep 17 00:00:00 2001 From: Rajneesh Bhardwaj Date: Fri, 23 Jun 2017 22:22:35 +0530 Subject: [PATCH] platform/x86: intel_telemetry: Add debugfs entry for S0ix residency 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 Signed-off-by: Andy Shevchenko --- .../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 b8be058a8754..cd21df982abd 100644 --- a/drivers/platform/x86/intel_telemetry_debugfs.c +++ b/drivers/platform/x86/intel_telemetry_debugfs.c @@ -710,6 +710,24 @@ static const struct file_operations telem_socstate_ops = { .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; @@ -987,6 +1005,14 @@ 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);