Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-mediagrafted

Pull media updates from Mauro Carvalho Chehab:

 - v4l2-core: added ISP statistics support and per-block validation

 - v4l2-core: Allow unknown HDR10 white point and luminance

 - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor

 - New codec: Milos: VPU v2.0 codec support

 - isp driver: gained support for Dreamchip RPPX1 ISP framework

 - vsp1 driver: gained support for RZ/T2H and RZ/N2H

 - Novalake driver: gained CVS support for new NVL hardware

 - dvb-core: fix feed leak on failed DMX_ADD_PID

 - several driver fixes, cleanups and minor improvements

* tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits)
  media: ipu-bridge: check all DMI entries when overriding sensor rotation
  media: v4l2-async: avoid deleting unlinked ASC entry on link error
  media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement
  media: intel/ipu6: fix async notifier cleanup leak on parse error
  media: staging/ipu7: fix async notifier UAF on probe error path
  media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path
  media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem()
  media: rcar-isp: Fix VSPX reference leaks
  media: rcar-isp: Release ISPCORE resources
  media: i2c: imx415: Release runtime PM reference on VBLANK error
  media: i2c: imx415: Return test pattern write errors
  media: renesas: vsp1: Declare index variables in for loop statement
  media: renesas: vsp1: Make reset control optional to support platforms without a reset line
  media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs
  media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs
  media: nxp: imx8-isi: Add additional 32-bit RGB format support
  media: nxp: imx8-isi: Add 16-bit raw Bayer format support
  media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams
  media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks
  media: nxp: imx8-isi: Correct color map between V4L2 and ISI
  ...

1 files changed, 228 insertions, 0 deletions

diff --git a/block/blk-stat.c b/block/blk-stat.c
new file mode 100644
index 000000000..de126e1ea
--- /dev/null
+++ b/block/blk-stat.c
@@ -0,0 +1,228 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Block stat tracking code
+ *
+ * Copyright (C) 2016 Jens Axboe
+ */
+#include <linux/kernel.h>
+#include <linux/rculist.h>
+
+#include "blk-stat.h"
+#include "blk-mq.h"
+#include "blk.h"
+
+struct blk_queue_stats {
+	struct list_head callbacks;
+	spinlock_t lock;
+	int accounting;
+};
+
+void blk_rq_stat_init(struct blk_rq_stat *stat)
+{
+	stat->min = -1ULL;
+	stat->max = stat->nr_samples = stat->mean = 0;
+	stat->batch = 0;
+}
+
+/* src is a per-cpu stat, mean isn't initialized */
+void blk_rq_stat_sum(struct blk_rq_stat *dst, struct blk_rq_stat *src)
+{
+	if (dst->nr_samples + src->nr_samples <= dst->nr_samples)
+		return;
+
+	dst->min = min(dst->min, src->min);
+	dst->max = max(dst->max, src->max);
+
+	dst->mean = div_u64(src->batch + dst->mean * dst->nr_samples,
+				dst->nr_samples + src->nr_samples);
+
+	dst->nr_samples += src->nr_samples;
+}
+
+void blk_rq_stat_add(struct blk_rq_stat *stat, u64 value)
+{
+	stat->min = min(stat->min, value);
+	stat->max = max(stat->max, value);
+	stat->batch += value;
+	stat->nr_samples++;
+}
+
+void blk_stat_add(struct request *rq, u64 now)
+{
+	struct request_queue *q = rq->q;
+	struct blk_stat_callback *cb;
+	struct blk_rq_stat *stat;
+	int bucket, cpu;
+	u64 value;
+
+	value = (now >= rq->io_start_time_ns) ? now - rq->io_start_time_ns : 0;
+
+	rcu_read_lock();
+	cpu = get_cpu();
+	list_for_each_entry_rcu(cb, &q->stats->callbacks, list) {
+		if (!blk_stat_is_active(cb))
+			continue;
+
+		bucket = cb->bucket_fn(rq);
+		if (bucket < 0)
+			continue;
+
+		stat = &per_cpu_ptr(cb->cpu_stat, cpu)[bucket];
+		blk_rq_stat_add(stat, value);
+	}
+	put_cpu();
+	rcu_read_unlock();
+}
+
+static void blk_stat_timer_fn(struct timer_list *t)
+{
+	struct blk_stat_callback *cb = timer_container_of(cb, t, timer);
+	unsigned int bucket;
+	int cpu;
+
+	for (bucket = 0; bucket < cb->buckets; bucket++)
+		blk_rq_stat_init(&cb->stat[bucket]);
+
+	for_each_online_cpu(cpu) {
+		struct blk_rq_stat *cpu_stat;
+
+		cpu_stat = per_cpu_ptr(cb->cpu_stat, cpu);
+		for (bucket = 0; bucket < cb->buckets; bucket++) {
+			blk_rq_stat_sum(&cb->stat[bucket], &cpu_stat[bucket]);
+			blk_rq_stat_init(&cpu_stat[bucket]);
+		}
+	}
+
+	cb->timer_fn(cb);
+}
+
+struct blk_stat_callback *
+blk_stat_alloc_callback(void (*timer_fn)(struct blk_stat_callback *),
+			int (*bucket_fn)(const struct request *),
+			unsigned int buckets, void *data)
+{
+	struct blk_stat_callback *cb;
+
+	cb = kmalloc_obj(*cb);
+	if (!cb)
+		return NULL;
+
+	cb->stat = kmalloc_objs(struct blk_rq_stat, buckets);
+	if (!cb->stat) {
+		kfree(cb);
+		return NULL;
+	}
+	cb->cpu_stat = __alloc_percpu(buckets * sizeof(struct blk_rq_stat),
+				      __alignof__(struct blk_rq_stat));
+	if (!cb->cpu_stat) {
+		kfree(cb->stat);
+		kfree(cb);
+		return NULL;
+	}
+
+	cb->timer_fn = timer_fn;
+	cb->bucket_fn = bucket_fn;
+	cb->data = data;
+	cb->buckets = buckets;
+	timer_setup(&cb->timer, blk_stat_timer_fn, 0);
+
+	return cb;
+}
+
+void blk_stat_add_callback(struct request_queue *q,
+			   struct blk_stat_callback *cb)
+{
+	unsigned int bucket;
+	unsigned long flags;
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		struct blk_rq_stat *cpu_stat;
+
+		cpu_stat = per_cpu_ptr(cb->cpu_stat, cpu);
+		for (bucket = 0; bucket < cb->buckets; bucket++)
+			blk_rq_stat_init(&cpu_stat[bucket]);
+	}
+
+	spin_lock_irqsave(&q->stats->lock, flags);
+	list_add_tail_rcu(&cb->list, &q->stats->callbacks);
+	blk_queue_flag_set(QUEUE_FLAG_STATS, q);
+	spin_unlock_irqrestore(&q->stats->lock, flags);
+}
+
+void blk_stat_remove_callback(struct request_queue *q,
+			      struct blk_stat_callback *cb)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&q->stats->lock, flags);
+	list_del_rcu(&cb->list);
+	if (list_empty(&q->stats->callbacks) && !q->stats->accounting)
+		blk_queue_flag_clear(QUEUE_FLAG_STATS, q);
+	spin_unlock_irqrestore(&q->stats->lock, flags);
+
+	timer_delete_sync(&cb->timer);
+}
+
+static void blk_stat_free_callback_rcu(struct rcu_head *head)
+{
+	struct blk_stat_callback *cb;
+
+	cb = container_of(head, struct blk_stat_callback, rcu);
+	free_percpu(cb->cpu_stat);
+	kfree(cb->stat);
+	kfree(cb);
+}
+
+void blk_stat_free_callback(struct blk_stat_callback *cb)
+{
+	if (cb)
+		call_rcu(&cb->rcu, blk_stat_free_callback_rcu);
+}
+
+void blk_stat_disable_accounting(struct request_queue *q)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&q->stats->lock, flags);
+	if (!--q->stats->accounting && list_empty(&q->stats->callbacks))
+		blk_queue_flag_clear(QUEUE_FLAG_STATS, q);
+	spin_unlock_irqrestore(&q->stats->lock, flags);
+}
+EXPORT_SYMBOL_GPL(blk_stat_disable_accounting);
+
+void blk_stat_enable_accounting(struct request_queue *q)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&q->stats->lock, flags);
+	if (!q->stats->accounting++ && list_empty(&q->stats->callbacks))
+		blk_queue_flag_set(QUEUE_FLAG_STATS, q);
+	spin_unlock_irqrestore(&q->stats->lock, flags);
+}
+EXPORT_SYMBOL_GPL(blk_stat_enable_accounting);
+
+struct blk_queue_stats *blk_alloc_queue_stats(void)
+{
+	struct blk_queue_stats *stats;
+
+	stats = kmalloc_obj(*stats);
+	if (!stats)
+		return NULL;
+
+	INIT_LIST_HEAD(&stats->callbacks);
+	spin_lock_init(&stats->lock);
+	stats->accounting = 0;
+
+	return stats;
+}
+
+void blk_free_queue_stats(struct blk_queue_stats *stats)
+{
+	if (!stats)
+		return;
+
+	WARN_ON(!list_empty(&stats->callbacks));
+
+	kfree(stats);
+}