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    Subject[RFC v2 6/6] PM / Domains: add debugfs 'states' and 'timings' seq files
    Date
    From: Marc Titinger <mtitinger@baylibre.com>

    This purpose of these debug seq-files is to help investigate
    generic power domain state transitions, based on device constraints.
    requires the "multiple states" patches from Axel Haslam.

    also rename 'summary' from 'pm_genpd_summary'

    sample output for 'states'
    ==========================

    Domain State name Eval = 2200nter + Exit = Min_off_on (ns)
    -----------------------------------------------------------------------
    a53_pd cluster-sleep-0 1500000+800000=2300000
    a57_pd d1-retention 1000000+800000=1800000
    a57_pd cluster-sleep-0 1500000+800000=2300000

    sample output for 'timings'
    ===========================

    Domain Devices, Timings in ns
    Stop/Start Save/Restore, Effective
    ---------------------------------------------------- ---
    a53_pd
    /cpus/cpu@100 1060 /660 1580 /1940 ,0 (cached stop)
    /cpus/cpu@101 1060 /740 1520 /1600 ,0 (cached stop)
    /cpus/cpu@102 880 /620 1380 /1780 ,0 (cached stop)
    /cpus/cpu@103 1080 /640 1340 /1600 ,0 (cached stop)
    a57_pd
    /cpus/cpu@0 1160 /740 3280 /1800 ,0 (cached stop)
    /cpus/cpu@1 780 /1400 1440 /2080 ,0 (cached stop)
    /D1 600 /540 7140 /6420 ,2199460 (cached stop)

    Signed-off-by: Marc Titinger <mtitinger@baylibre.com>
    ---
    drivers/base/power/domain.c | 107 +++++++++++++++++++++++++++++++++++++++++++-
    1 file changed, 105 insertions(+), 2 deletions(-)

    diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
    index ebf1299..5de2112 100644
    --- a/drivers/base/power/domain.c
    +++ b/drivers/base/power/domain.c
    @@ -2468,6 +2468,96 @@ static const struct file_operations pm_genpd_summary_fops = {
    .release = single_release,
    };

    +static int pm_genpd_states_show(struct seq_file *s, void *data)
    +{
    + struct generic_pm_domain *genpd;
    +
    + seq_puts(s,
    + "\n Domain State name Enter + Exit = Min_off_on (ns)\n");
    + seq_puts(s,
    + "-----------------------------------------------------------------------\n");
    +
    + list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
    +
    + int i;
    +
    + for (i = 0; i < genpd->state_count; i++) {
    + seq_printf(s, "%-20s %-20s %lld+%lld=%lld\n",
    + genpd->name,
    + genpd->states[i].name,
    + genpd->states[i].power_on_latency_ns,
    + genpd->states[i].power_off_latency_ns,
    + genpd->states[i].power_off_latency_ns
    + + genpd->states[i].power_on_latency_ns);
    + }
    +
    + }
    +
    + seq_puts(s, "\n");
    +
    + return 0;
    +}
    +
    +static int pm_genpd_states_open(struct inode *inode, struct file *file)
    +{
    + return single_open(file, pm_genpd_states_show, NULL);
    +}
    +
    +static const struct file_operations pm_genpd_states_fops = {
    + .open = pm_genpd_states_open,
    + .read = seq_read,
    + .llseek = seq_lseek,
    + .release = single_release,
    +};
    +
    +static int pm_genpd_timing_show(struct seq_file *s, void *data)
    +{
    + struct generic_pm_domain *genpd;
    +
    + seq_puts(s, "\n Domain Devices, Timings in ns\n");
    + seq_puts(s,
    + " Stop/Start Save/Restore, Effective\n");
    + seq_puts(s,
    + "---------------------------------------------------- ---\n");
    +
    + list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
    + struct pm_domain_data *pm_data;
    +
    + seq_printf(s, "%-30s", genpd->name);
    +
    + list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
    + struct gpd_timing_data *td = &to_gpd_data(pm_data)->td;
    +
    + if (!pm_data->dev->of_node)
    + continue;
    +
    + seq_printf(s,
    + "\n %-20s %-6lld/%-6lld %-6lld/%-6lld,%lld %s%s",
    + pm_data->dev->of_node->full_name,
    + td->stop_latency_ns, td->start_latency_ns,
    + td->save_state_latency_ns,
    + td->restore_state_latency_ns,
    + td->effective_constraint_ns,
    + td->cached_stop_ok ? "(cached stop) " : "",
    + td->constraint_changed ? "(changed)" : "");
    + }
    + seq_puts(s, "\n");
    + }
    + return 0;
    +}
    +
    +static int pm_genpd_timing_open(struct inode *inode, struct file *file)
    +{
    + return single_open(file, pm_genpd_timing_show, NULL);
    +}
    +
    +static const struct file_operations pm_genpd_timing_fops = {
    + .open = pm_genpd_timing_open,
    + .read = seq_read,
    + .llseek = seq_lseek,
    + .release = single_release,
    +};
    +
    static int __init pm_genpd_debug_init(void)
    {
    struct dentry *d;
    @@ -2477,8 +2567,21 @@ static int __init pm_genpd_debug_init(void)
    if (!pm_genpd_debugfs_dir)
    return -ENOMEM;

    - d = debugfs_create_file("pm_genpd_summary", S_IRUGO,
    - pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops);
    + d = debugfs_create_file("summary", S_IRUGO,
    + pm_genpd_debugfs_dir, NULL,
    + &pm_genpd_summary_fops);
    + if (!d)
    + return -ENOMEM;
    +
    + d = debugfs_create_file("states", S_IRUGO,
    + pm_genpd_debugfs_dir, NULL,
    + &pm_genpd_states_fops);
    + if (!d)
    + return -ENOMEM;
    +
    + d = debugfs_create_file("timings", S_IRUGO,
    + pm_genpd_debugfs_dir, NULL,
    + &pm_genpd_timing_fops);
    if (!d)
    return -ENOMEM;

    --
    1.9.1


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