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Commit bc8c47ab authored by Rajneesh Bhardwaj's avatar Rajneesh Bhardwaj Committed by Darren Hart (VMware)
Browse files

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: default avatarShanth Murthy <shanth.murthy@intel.com>
Signed-off-by: default avatarRajneesh Bhardwaj <rajneesh.bhardwaj@intel.com>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
parent 7a3a51ab

drivers/platform/x86/intel_telemetry_debugfs.c

+26 −0
Original line number Diff line number Diff line
@@ -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);