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SubjectRe: [PATCH v2] x86/intel_telemetry: Add debugfs entry for S0ix residency
On Fri, Jun 23, 2017 at 7:52 PM, Rajneesh Bhardwaj
<rajneesh.bhardwaj@intel.com> wrote:
> 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.

Applied for testing, thanks!

>
> 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>
> ---
> 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
>



--
With Best Regards,
Andy Shevchenko

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