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regmap: async: Add tracepoints for async I/O
Trace when we start and complete async writes, and when we start and finish blocking for their completion. This is useful for performance analysis of the resulting I/O patterns. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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@ -999,6 +999,8 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
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if (!async)
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return -ENOMEM;
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trace_regmap_async_write_start(map->dev, reg, val_len);
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async->work_buf = kzalloc(map->format.buf_size,
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GFP_KERNEL | GFP_DMA);
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if (!async->work_buf) {
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@ -1640,6 +1642,8 @@ void regmap_async_complete_cb(struct regmap_async *async, int ret)
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struct regmap *map = async->map;
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bool wake;
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trace_regmap_async_io_complete(map->dev);
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spin_lock(&map->async_lock);
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list_del(&async->list);
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@ -1686,6 +1690,8 @@ int regmap_async_complete(struct regmap *map)
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if (!map->bus->async_write)
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return 0;
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trace_regmap_async_complete_start(map->dev);
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wait_event(map->async_waitq, regmap_async_is_done(map));
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spin_lock_irqsave(&map->async_lock, flags);
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@ -1693,6 +1699,8 @@ int regmap_async_complete(struct regmap *map)
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map->async_ret = 0;
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spin_unlock_irqrestore(&map->async_lock, flags);
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trace_regmap_async_complete_done(map->dev);
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return ret;
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}
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EXPORT_SYMBOL_GPL(regmap_async_complete);
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@ -175,6 +175,54 @@ DEFINE_EVENT(regmap_bool, regmap_cache_bypass,
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);
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DECLARE_EVENT_CLASS(regmap_async,
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TP_PROTO(struct device *dev),
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TP_ARGS(dev),
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TP_STRUCT__entry(
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__string( name, dev_name(dev) )
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),
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TP_fast_assign(
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__assign_str(name, dev_name(dev));
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),
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TP_printk("%s", __get_str(name))
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);
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DEFINE_EVENT(regmap_block, regmap_async_write_start,
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TP_PROTO(struct device *dev, unsigned int reg, int count),
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TP_ARGS(dev, reg, count)
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);
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DEFINE_EVENT(regmap_async, regmap_async_io_complete,
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TP_PROTO(struct device *dev),
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TP_ARGS(dev)
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);
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DEFINE_EVENT(regmap_async, regmap_async_complete_start,
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TP_PROTO(struct device *dev),
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TP_ARGS(dev)
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);
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DEFINE_EVENT(regmap_async, regmap_async_complete_done,
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TP_PROTO(struct device *dev),
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TP_ARGS(dev)
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);
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#endif /* _TRACE_REGMAP_H */
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/* This part must be outside protection */
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