3 files changed, 70 insertions, 12 deletions

diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index d9dc2c38764a..7d66ee68aaaf 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -10,6 +10,7 @@
 
 #include <linux/cpu.h>
 #include <linux/cpumask.h>
+#include <linux/debugfs.h>
 #include <linux/energy_model.h>
 #include <linux/sched/topology.h>
 #include <linux/slab.h>
@@ -23,6 +24,60 @@ static DEFINE_PER_CPU(struct em_perf_domain *, em_data);
  */
 static DEFINE_MUTEX(em_pd_mutex);
 
+#ifdef CONFIG_DEBUG_FS
+static struct dentry *rootdir;
+
+static void em_debug_create_cs(struct em_cap_state *cs, struct dentry *pd)
+{
+	struct dentry *d;
+	char name[24];
+
+	snprintf(name, sizeof(name), "cs:%lu", cs->frequency);
+
+	/* Create per-cs directory */
+	d = debugfs_create_dir(name, pd);
+	debugfs_create_ulong("frequency", 0444, d, &cs->frequency);
+	debugfs_create_ulong("power", 0444, d, &cs->power);
+	debugfs_create_ulong("cost", 0444, d, &cs->cost);
+}
+
+static int em_debug_cpus_show(struct seq_file *s, void *unused)
+{
+	seq_printf(s, "%*pbl\n", cpumask_pr_args(to_cpumask(s->private)));
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(em_debug_cpus);
+
+static void em_debug_create_pd(struct em_perf_domain *pd, int cpu)
+{
+	struct dentry *d;
+	char name[8];
+	int i;
+
+	snprintf(name, sizeof(name), "pd%d", cpu);
+
+	/* Create the directory of the performance domain */
+	d = debugfs_create_dir(name, rootdir);
+
+	debugfs_create_file("cpus", 0444, d, pd->cpus, &em_debug_cpus_fops);
+
+	/* Create a sub-directory for each capacity state */
+	for (i = 0; i < pd->nr_cap_states; i++)
+		em_debug_create_cs(&pd->table[i], d);
+}
+
+static int __init em_debug_init(void)
+{
+	/* Create /sys/kernel/debug/energy_model directory */
+	rootdir = debugfs_create_dir("energy_model", NULL);
+
+	return 0;
+}
+core_initcall(em_debug_init);
+#else /* CONFIG_DEBUG_FS */
+static void em_debug_create_pd(struct em_perf_domain *pd, int cpu) {}
+#endif
 static struct em_perf_domain *em_create_pd(cpumask_t *span, int nr_states,
 						struct em_data_callback *cb)
 {
@@ -102,6 +157,8 @@ static struct em_perf_domain *em_create_pd(cpumask_t *span, int nr_states,
 	pd->nr_cap_states = nr_states;
 	cpumask_copy(to_cpumask(pd->cpus), span);
 
+	em_debug_create_pd(pd, cpu);
+
 	return pd;
 
 free_cs_table:
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index b7a82502857a..9d22131afc1e 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -582,10 +582,8 @@ static int register_pm_qos_misc(struct pm_qos_object *qos, struct dentry *d)
 	qos->pm_qos_power_miscdev.name = qos->name;
 	qos->pm_qos_power_miscdev.fops = &pm_qos_power_fops;
 
-	if (d) {
-		(void)debugfs_create_file(qos->name, S_IRUGO, d,
-					  (void *)qos, &pm_qos_debug_fops);
-	}
+	debugfs_create_file(qos->name, S_IRUGO, d, (void *)qos,
+			    &pm_qos_debug_fops);
 
 	return misc_register(&qos->pm_qos_power_miscdev);
 }
@@ -685,8 +683,6 @@ static int __init pm_qos_power_init(void)
 	BUILD_BUG_ON(ARRAY_SIZE(pm_qos_array) != PM_QOS_NUM_CLASSES);
 
 	d = debugfs_create_dir("pm_qos", NULL);
-	if (IS_ERR_OR_NULL(d))
-		d = NULL;
 
 	for (i = PM_QOS_CPU_DMA_LATENCY; i < PM_QOS_NUM_CLASSES; i++) {
 		ret = register_pm_qos_misc(pm_qos_array[i], d);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 640b2034edd6..4802b039b89f 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1215,14 +1215,16 @@ static struct page *saveable_highmem_page(struct zone *zone, unsigned long pfn)
 	if (!pfn_valid(pfn))
 		return NULL;
 
-	page = pfn_to_page(pfn);
-	if (page_zone(page) != zone)
+	page = pfn_to_online_page(pfn);
+	if (!page || page_zone(page) != zone)
 		return NULL;
 
 	BUG_ON(!PageHighMem(page));
 
-	if (swsusp_page_is_forbidden(page) ||  swsusp_page_is_free(page) ||
-	    PageReserved(page))
+	if (swsusp_page_is_forbidden(page) ||  swsusp_page_is_free(page))
+		return NULL;
+
+	if (PageReserved(page) || PageOffline(page))
 		return NULL;
 
 	if (page_is_guard(page))
@@ -1277,8 +1279,8 @@ static struct page *saveable_page(struct zone *zone, unsigned long pfn)
 	if (!pfn_valid(pfn))
 		return NULL;
 
-	page = pfn_to_page(pfn);
-	if (page_zone(page) != zone)
+	page = pfn_to_online_page(pfn);
+	if (!page || page_zone(page) != zone)
 		return NULL;
 
 	BUG_ON(PageHighMem(page));
@@ -1286,6 +1288,9 @@ static struct page *saveable_page(struct zone *zone, unsigned long pfn)
 	if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page))
 		return NULL;
 
+	if (PageOffline(page))
+		return NULL;
+
 	if (PageReserved(page)
 	    && (!kernel_page_present(page) || pfn_is_nosave(pfn)))
 		return NULL;