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platform/x86: intel_telemetry: Add debugfs entry for S0ix residency

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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 <shanth.murthy@intel.com>
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Rajneesh Bhardwaj 2017-06-23 22:22:35 +05:30 committed by Darren Hart (VMware)
parent 7a3a51ab94
commit bc8c47abd4
1 changed files with 26 additions and 0 deletions
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26
drivers/platform/x86/intel_telemetry_debugfs.c
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@ -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);