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PM: EM: Expose the ID of a performance domain via debugfs 

For ease of debugging, let's expose the assigned ID of a performance
domain through debugfs (e.g., /sys/kernel/debug/energy_model/cpu0/id).

Signed-off-by: Changwoo Min <changwoo@igalia.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20251020220914.320832-3-changwoo@igalia.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Changwoo Min 2025-10-21 07:09:06 +09:00 committed by Rafael J. Wysocki
parent cbe5aeedec
commit ee50b8bb6b
1 changed files with 12 additions and 0 deletions
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12
kernel/power/energy_model.c
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@ -126,6 +126,16 @@ static int em_debug_flags_show(struct seq_file *s, void *unused)
} }
DEFINE_SHOW_ATTRIBUTE(em_debug_flags); DEFINE_SHOW_ATTRIBUTE(em_debug_flags);
static int em_debug_id_show(struct seq_file *s, void *unused)
{
struct em_perf_domain *pd = s->private;
seq_printf(s, "%d\n", pd->id);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(em_debug_id);
static void em_debug_create_pd(struct device *dev) static void em_debug_create_pd(struct device *dev)
{ {
struct em_dbg_info *em_dbg; struct em_dbg_info *em_dbg;
@ -142,6 +152,8 @@ static void em_debug_create_pd(struct device *dev)
debugfs_create_file("flags", 0444, d, dev->em_pd, debugfs_create_file("flags", 0444, d, dev->em_pd,
&em_debug_flags_fops); &em_debug_flags_fops);
debugfs_create_file("id", 0444, d, dev->em_pd, &em_debug_id_fops);
em_dbg = devm_kcalloc(dev, dev->em_pd->nr_perf_states, em_dbg = devm_kcalloc(dev, dev->em_pd->nr_perf_states,
sizeof(*em_dbg), GFP_KERNEL); sizeof(*em_dbg), GFP_KERNEL);
if (!em_dbg) if (!em_dbg)