Merge tag 'lsk-v4.4-18.05-android' of git://git.linaro.org/kernel/linux-linaro-stable.git

LSK 18.05 v4.4-android

* tag 'lsk-v4.4-18.05-android': (605 commits)
  ANDROID: sdcardfs: Don't d_drop in d_revalidate
  goldfish: pipe: ANDROID: mark local functions static
  UPSTREAM: ANDROID: binder: prevent transactions into own process.
  goldfish: pipe: ANDROID: Add DMA support
  UPSTREAM: f2fs: clear PageError on writepage - part 2
  UPSTREAM: f2fs: avoid fsync() failure caused by EAGAIN in writepage()
  ANDROID: x86_64_cuttlefish_defconfig: Disable KPTI
  UPSTREAM: mac80211: ibss: Fix channel type enum in ieee80211_sta_join_ibss()
  UPSTREAM: mac80211: Fix clang warning about constant operand in logical operation
  UPSTREAM: nl80211: Fix enum type of variable in nl80211_put_sta_rate()
  UPSTREAM: sysfs: remove signedness from sysfs_get_dirent
  UPSTREAM: tracing: Use cpumask_available() to check if cpumask variable may be used
  BACKPORT: clocksource: Use GENMASK_ULL in definition of CLOCKSOURCE_MASK
  UPSTREAM: netpoll: Fix device name check in netpoll_setup()
  FROMLIST: staging: Fix sparse warnings in vsoc driver.
  FROMLIST: staging: vsoc: Fix a i386-randconfig warning.
  FROMLIST: staging: vsoc: Create wc kernel mapping for region shm.
  goldfish: pipe: ANDROID: Replace writel with gf_write_ptr
  goldfish: pipe: ANDROID: Use dev_ logging instead of pr_
  goldfish: pipe: ANDROID: fix checkpatch warnings
  ...

Conflicts:
	fs/f2fs/node.c
	scripts/Makefile.lib

Change-Id: Ib92d11938a383464249fe6f2dad3ab2a05bc4770

4 files changed, 477 insertions, 7 deletions

diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index 0dcc74e6328e..ac1bb26fb158 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -46,6 +46,15 @@ config CPU_FREQ_STAT_DETAILS
 
 	  If in doubt, say N.
 
+config CPU_FREQ_TIMES
+       bool "CPU frequency time-in-state statistics"
+       default y
+       help
+         This driver exports CPU time-in-state information through procfs file
+         system.
+
+         If in doubt, say N.
+
 choice
 	prompt "Default CPUFreq governor"
 	default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 6bc68fac278a..0ee100487c2b 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -4,7 +4,10 @@ obj-$(CONFIG_CPU_FREQ)			+= cpufreq.o freq_table.o cpufreq_governor_attr_set.o
 # CPUfreq stats
 obj-$(CONFIG_CPU_FREQ_STAT)             += cpufreq_stats.o
 
-# CPUfreq governors 
+# CPUfreq times
+obj-$(CONFIG_CPU_FREQ_TIMES)		+= cpufreq_times.o
+
+# CPUfreq governors
 obj-$(CONFIG_CPU_FREQ_GOV_PERFORMANCE)	+= cpufreq_performance.o
 obj-$(CONFIG_CPU_FREQ_GOV_POWERSAVE)	+= cpufreq_powersave.o
 obj-$(CONFIG_CPU_FREQ_GOV_USERSPACE)	+= cpufreq_userspace.o
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 7debc2ce3fbf..2a6593dde250 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -19,6 +19,7 @@
 
 #include <linux/cpu.h>
 #include <linux/cpufreq.h>
+#include <linux/cpufreq_times.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/init.h>
@@ -437,6 +438,7 @@ static void __cpufreq_notify_transition(struct cpufreq_policy *policy,
 		pr_debug("FREQ: %lu - CPU: %lu\n",
 			 (unsigned long)freqs->new, (unsigned long)freqs->cpu);
 		trace_cpu_frequency(freqs->new, freqs->cpu);
+		cpufreq_times_record_transition(freqs);
 		srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
 				CPUFREQ_POSTCHANGE, freqs);
 		if (likely(policy) && likely(policy->cpu == freqs->cpu))
@@ -645,8 +647,6 @@ static int cpufreq_parse_governor(char *str_governor, unsigned int *policy,
 			*governor = t;
 			err = 0;
 		}
-		if (t && !try_module_get(t->owner))
-			t = NULL;
 
 		mutex_unlock(&cpufreq_governor_mutex);
 	}
@@ -765,10 +765,6 @@ static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
 		return -EINVAL;
 
 	ret = cpufreq_set_policy(policy, &new_policy);
-
-	if (new_policy.governor)
-		module_put(new_policy.governor->owner);
-
 	return ret ? ret : count;
 }
 
@@ -1345,6 +1341,7 @@ static int cpufreq_online(unsigned int cpu)
 			goto out_exit_policy;
 		blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
 				CPUFREQ_CREATE_POLICY, policy);
+		cpufreq_times_create_policy(policy);
 
 		write_lock_irqsave(&cpufreq_driver_lock, flags);
 		list_add(&policy->policy_list, &cpufreq_policy_list);
diff --git a/drivers/cpufreq/cpufreq_times.c b/drivers/cpufreq/cpufreq_times.c
new file mode 100644
index 000000000000..e5df7a47cc16
--- /dev/null
+++ b/drivers/cpufreq/cpufreq_times.c
@@ -0,0 +1,461 @@
+/* drivers/cpufreq/cpufreq_times.c
+ *
+ * Copyright (C) 2018 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/cpufreq.h>
+#include <linux/cpufreq_times.h>
+#include <linux/cputime.h>
+#include <linux/hashtable.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/threads.h>
+
+#define UID_HASH_BITS 10
+
+DECLARE_HASHTABLE(uid_hash_table, UID_HASH_BITS);
+
+static DEFINE_SPINLOCK(task_time_in_state_lock); /* task->time_in_state */
+static DEFINE_SPINLOCK(uid_lock); /* uid_hash_table */
+
+struct uid_entry {
+	uid_t uid;
+	unsigned int max_state;
+	struct hlist_node hash;
+	struct rcu_head rcu;
+	u64 time_in_state[0];
+};
+
+/**
+ * struct cpu_freqs - per-cpu frequency information
+ * @offset: start of these freqs' stats in task time_in_state array
+ * @max_state: number of entries in freq_table
+ * @last_index: index in freq_table of last frequency switched to
+ * @freq_table: list of available frequencies
+ */
+struct cpu_freqs {
+	unsigned int offset;
+	unsigned int max_state;
+	unsigned int last_index;
+	unsigned int freq_table[0];
+};
+
+static struct cpu_freqs *all_freqs[NR_CPUS];
+
+static unsigned int next_offset;
+
+
+/* Caller must hold rcu_read_lock() */
+static struct uid_entry *find_uid_entry_rcu(uid_t uid)
+{
+	struct uid_entry *uid_entry;
+
+	hash_for_each_possible_rcu(uid_hash_table, uid_entry, hash, uid) {
+		if (uid_entry->uid == uid)
+			return uid_entry;
+	}
+	return NULL;
+}
+
+/* Caller must hold uid lock */
+static struct uid_entry *find_uid_entry_locked(uid_t uid)
+{
+	struct uid_entry *uid_entry;
+
+	hash_for_each_possible(uid_hash_table, uid_entry, hash, uid) {
+		if (uid_entry->uid == uid)
+			return uid_entry;
+	}
+	return NULL;
+}
+
+/* Caller must hold uid lock */
+static struct uid_entry *find_or_register_uid_locked(uid_t uid)
+{
+	struct uid_entry *uid_entry, *temp;
+	unsigned int max_state = READ_ONCE(next_offset);
+	size_t alloc_size = sizeof(*uid_entry) + max_state *
+		sizeof(uid_entry->time_in_state[0]);
+
+	uid_entry = find_uid_entry_locked(uid);
+	if (uid_entry) {
+		if (uid_entry->max_state == max_state)
+			return uid_entry;
+		/* uid_entry->time_in_state is too small to track all freqs, so
+		 * expand it.
+		 */
+		temp = __krealloc(uid_entry, alloc_size, GFP_ATOMIC);
+		if (!temp)
+			return uid_entry;
+		temp->max_state = max_state;
+		memset(temp->time_in_state + uid_entry->max_state, 0,
+		       (max_state - uid_entry->max_state) *
+		       sizeof(uid_entry->time_in_state[0]));
+		if (temp != uid_entry) {
+			hlist_replace_rcu(&uid_entry->hash, &temp->hash);
+			kfree_rcu(uid_entry, rcu);
+		}
+		return temp;
+	}
+
+	uid_entry = kzalloc(alloc_size, GFP_ATOMIC);
+	if (!uid_entry)
+		return NULL;
+
+	uid_entry->uid = uid;
+	uid_entry->max_state = max_state;
+
+	hash_add_rcu(uid_hash_table, &uid_entry->hash, uid);
+
+	return uid_entry;
+}
+
+static bool freq_index_invalid(unsigned int index)
+{
+	unsigned int cpu;
+	struct cpu_freqs *freqs;
+
+	for_each_possible_cpu(cpu) {
+		freqs = all_freqs[cpu];
+		if (!freqs || index < freqs->offset ||
+		    freqs->offset + freqs->max_state <= index)
+			continue;
+		return freqs->freq_table[index - freqs->offset] ==
+			CPUFREQ_ENTRY_INVALID;
+	}
+	return true;
+}
+
+static int single_uid_time_in_state_show(struct seq_file *m, void *ptr)
+{
+	struct uid_entry *uid_entry;
+	unsigned int i;
+	u64 time;
+	uid_t uid = from_kuid_munged(current_user_ns(), *(kuid_t *)m->private);
+
+	if (uid == overflowuid)
+		return -EINVAL;
+
+	rcu_read_lock();
+
+	uid_entry = find_uid_entry_rcu(uid);
+	if (!uid_entry) {
+		rcu_read_unlock();
+		return 0;
+	}
+
+	for (i = 0; i < uid_entry->max_state; ++i) {
+		if (freq_index_invalid(i))
+			continue;
+		time = cputime_to_clock_t(uid_entry->time_in_state[i]);
+		seq_write(m, &time, sizeof(time));
+	}
+
+	rcu_read_unlock();
+
+	return 0;
+}
+
+static void *uid_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	if (*pos >= HASH_SIZE(uid_hash_table))
+		return NULL;
+
+	return &uid_hash_table[*pos];
+}
+
+static void *uid_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	(*pos)++;
+
+	if (*pos >= HASH_SIZE(uid_hash_table))
+		return NULL;
+
+	return &uid_hash_table[*pos];
+}
+
+static void uid_seq_stop(struct seq_file *seq, void *v) { }
+
+static int uid_time_in_state_seq_show(struct seq_file *m, void *v)
+{
+	struct uid_entry *uid_entry;
+	struct cpu_freqs *freqs, *last_freqs = NULL;
+	int i, cpu;
+
+	if (v == uid_hash_table) {
+		seq_puts(m, "uid:");
+		for_each_possible_cpu(cpu) {
+			freqs = all_freqs[cpu];
+			if (!freqs || freqs == last_freqs)
+				continue;
+			last_freqs = freqs;
+			for (i = 0; i < freqs->max_state; i++) {
+				if (freqs->freq_table[i] ==
+				    CPUFREQ_ENTRY_INVALID)
+					continue;
+				seq_printf(m, " %d", freqs->freq_table[i]);
+			}
+		}
+		seq_putc(m, '\n');
+	}
+
+	rcu_read_lock();
+
+	hlist_for_each_entry_rcu(uid_entry, (struct hlist_head *)v, hash) {
+		if (uid_entry->max_state)
+			seq_printf(m, "%d:", uid_entry->uid);
+		for (i = 0; i < uid_entry->max_state; ++i) {
+			if (freq_index_invalid(i))
+				continue;
+			seq_printf(m, " %lu", (unsigned long)cputime_to_clock_t(
+					   uid_entry->time_in_state[i]));
+		}
+		if (uid_entry->max_state)
+			seq_putc(m, '\n');
+	}
+
+	rcu_read_unlock();
+	return 0;
+}
+
+void cpufreq_task_times_init(struct task_struct *p)
+{
+	void *temp;
+	unsigned long flags;
+	unsigned int max_state;
+
+	spin_lock_irqsave(&task_time_in_state_lock, flags);
+	p->time_in_state = NULL;
+	spin_unlock_irqrestore(&task_time_in_state_lock, flags);
+	p->max_state = 0;
+
+	max_state = READ_ONCE(next_offset);
+
+	/* We use one array to avoid multiple allocs per task */
+	temp = kcalloc(max_state, sizeof(p->time_in_state[0]), GFP_ATOMIC);
+	if (!temp)
+		return;
+
+	spin_lock_irqsave(&task_time_in_state_lock, flags);
+	p->time_in_state = temp;
+	spin_unlock_irqrestore(&task_time_in_state_lock, flags);
+	p->max_state = max_state;
+}
+
+/* Caller must hold task_time_in_state_lock */
+static int cpufreq_task_times_realloc_locked(struct task_struct *p)
+{
+	void *temp;
+	unsigned int max_state = READ_ONCE(next_offset);
+
+	temp = krealloc(p->time_in_state, max_state * sizeof(u64), GFP_ATOMIC);
+	if (!temp)
+		return -ENOMEM;
+	p->time_in_state = temp;
+	memset(p->time_in_state + p->max_state, 0,
+	       (max_state - p->max_state) * sizeof(u64));
+	p->max_state = max_state;
+	return 0;
+}
+
+void cpufreq_task_times_exit(struct task_struct *p)
+{
+	unsigned long flags;
+	void *temp;
+
+	if (!p->time_in_state)
+		return;
+
+	spin_lock_irqsave(&task_time_in_state_lock, flags);
+	temp = p->time_in_state;
+	p->time_in_state = NULL;
+	spin_unlock_irqrestore(&task_time_in_state_lock, flags);
+	kfree(temp);
+}
+
+int proc_time_in_state_show(struct seq_file *m, struct pid_namespace *ns,
+	struct pid *pid, struct task_struct *p)
+{
+	unsigned int cpu, i;
+	cputime_t cputime;
+	unsigned long flags;
+	struct cpu_freqs *freqs;
+	struct cpu_freqs *last_freqs = NULL;
+
+	spin_lock_irqsave(&task_time_in_state_lock, flags);
+	for_each_possible_cpu(cpu) {
+		freqs = all_freqs[cpu];
+		if (!freqs || freqs == last_freqs)
+			continue;
+		last_freqs = freqs;
+
+		seq_printf(m, "cpu%u\n", cpu);
+		for (i = 0; i < freqs->max_state; i++) {
+			if (freqs->freq_table[i] == CPUFREQ_ENTRY_INVALID)
+				continue;
+			cputime = 0;
+			if (freqs->offset + i < p->max_state &&
+			    p->time_in_state)
+				cputime = p->time_in_state[freqs->offset + i];
+			seq_printf(m, "%u %lu\n", freqs->freq_table[i],
+				   (unsigned long)cputime_to_clock_t(cputime));
+		}
+	}
+	spin_unlock_irqrestore(&task_time_in_state_lock, flags);
+	return 0;
+}
+
+void cpufreq_acct_update_power(struct task_struct *p, cputime_t cputime)
+{
+	unsigned long flags;
+	unsigned int state;
+	struct uid_entry *uid_entry;
+	struct cpu_freqs *freqs = all_freqs[task_cpu(p)];
+	uid_t uid = from_kuid_munged(current_user_ns(), task_uid(p));
+
+	if (!freqs || p->flags & PF_EXITING)
+		return;
+
+	state = freqs->offset + READ_ONCE(freqs->last_index);
+
+	spin_lock_irqsave(&task_time_in_state_lock, flags);
+	if ((state < p->max_state || !cpufreq_task_times_realloc_locked(p)) &&
+	    p->time_in_state)
+		p->time_in_state[state] += cputime;
+	spin_unlock_irqrestore(&task_time_in_state_lock, flags);
+
+	spin_lock_irqsave(&uid_lock, flags);
+	uid_entry = find_or_register_uid_locked(uid);
+	if (uid_entry && state < uid_entry->max_state)
+		uid_entry->time_in_state[state] += cputime;
+	spin_unlock_irqrestore(&uid_lock, flags);
+}
+
+void cpufreq_times_create_policy(struct cpufreq_policy *policy)
+{
+	int cpu, index;
+	unsigned int count = 0;
+	struct cpufreq_frequency_table *pos, *table;
+	struct cpu_freqs *freqs;
+	void *tmp;
+
+	if (all_freqs[policy->cpu])
+		return;
+
+	table = cpufreq_frequency_get_table(policy->cpu);
+	if (!table)
+		return;
+
+	cpufreq_for_each_entry(pos, table)
+		count++;
+
+	tmp =  kzalloc(sizeof(*freqs) + sizeof(freqs->freq_table[0]) * count,
+		       GFP_KERNEL);
+	if (!tmp)
+		return;
+
+	freqs = tmp;
+	freqs->max_state = count;
+
+	index = cpufreq_frequency_table_get_index(policy, policy->cur);
+	if (index >= 0)
+		WRITE_ONCE(freqs->last_index, index);
+
+	cpufreq_for_each_entry(pos, table)
+		freqs->freq_table[pos - table] = pos->frequency;
+
+	freqs->offset = next_offset;
+	WRITE_ONCE(next_offset, freqs->offset + count);
+	for_each_cpu(cpu, policy->related_cpus)
+		all_freqs[cpu] = freqs;
+}
+
+void cpufreq_task_times_remove_uids(uid_t uid_start, uid_t uid_end)
+{
+	struct uid_entry *uid_entry;
+	struct hlist_node *tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&uid_lock, flags);
+
+	for (; uid_start <= uid_end; uid_start++) {
+		hash_for_each_possible_safe(uid_hash_table, uid_entry, tmp,
+			hash, uid_start) {
+			if (uid_start == uid_entry->uid) {
+				hash_del_rcu(&uid_entry->hash);
+				kfree_rcu(uid_entry, rcu);
+			}
+		}
+	}
+
+	spin_unlock_irqrestore(&uid_lock, flags);
+}
+
+void cpufreq_times_record_transition(struct cpufreq_freqs *freq)
+{
+	int index;
+	struct cpu_freqs *freqs = all_freqs[freq->cpu];
+	struct cpufreq_policy *policy;
+
+	if (!freqs)
+		return;
+
+	policy = cpufreq_cpu_get(freq->cpu);
+	if (!policy)
+		return;
+
+	index = cpufreq_frequency_table_get_index(policy, freq->new);
+	if (index >= 0)
+		WRITE_ONCE(freqs->last_index, index);
+
+	cpufreq_cpu_put(policy);
+}
+
+static const struct seq_operations uid_time_in_state_seq_ops = {
+	.start = uid_seq_start,
+	.next = uid_seq_next,
+	.stop = uid_seq_stop,
+	.show = uid_time_in_state_seq_show,
+};
+
+static int uid_time_in_state_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &uid_time_in_state_seq_ops);
+}
+
+int single_uid_time_in_state_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, single_uid_time_in_state_show,
+			&(inode->i_uid));
+}
+
+static const struct file_operations uid_time_in_state_fops = {
+	.open		= uid_time_in_state_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
+static int __init cpufreq_times_init(void)
+{
+	proc_create_data("uid_time_in_state", 0444, NULL,
+			 &uid_time_in_state_fops, NULL);
+
+	return 0;
+}
+
+early_initcall(cpufreq_times_init);