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Commit 017cc022 authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] Convert dmabounce statistics to use a device attribute 



Rather than printk'ing the dmabounce statistics occasionally to
the kernel log, provide a sysfs file to allow this information
to be periodically read.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent ab2c2152

arch/arm/common/dmabounce.c

+15 −20
Original line number Diff line number Diff line
@@ -32,7 +32,6 @@ 


#include <asm/cacheflush.h>



#undef DEBUG

#undef STATS



#ifdef STATS
@@ -72,6 +71,7 @@ struct dmabounce_device_info { 
	unsigned long total_allocs;

	unsigned long map_op_count;

	unsigned long bounce_count;

	int attr_res;

#endif

	struct dmabounce_pool	small;

	struct dmabounce_pool	large;
@@ -80,16 +80,21 @@ struct dmabounce_device_info { 
};



#ifdef STATS

static void print_alloc_stats(struct dmabounce_device_info *device_info)

static ssize_t dmabounce_show(struct device *dev, struct device_attribute *attr,

			      char *buf)

{

	printk(KERN_INFO

		"%s: dmabounce: sbp: %lu, lbp: %lu, other: %lu, total: %lu\n",

		device_info->dev->bus_id,

		device_info->small.allocs, device_info->large.allocs,

	struct dmabounce_device_info *device_info = dev->archdata.dmabounce;

	return sprintf(buf, "%lu %lu %lu %lu %lu %lu\n",

		device_info->small.allocs,

		device_info->large.allocs,

		device_info->total_allocs - device_info->small.allocs -

			device_info->large.allocs,

		device_info->total_allocs);

		device_info->total_allocs,

		device_info->map_op_count,

		device_info->bounce_count);

}



static DEVICE_ATTR(dmabounce_stats, 0400, dmabounce_show, NULL);

#endif
@@ -145,8 +150,6 @@ alloc_safe_buffer(struct dmabounce_device_info *device_info, void *ptr, 
	if (pool)

		pool->allocs++;

	device_info->total_allocs++;

	if (device_info->total_allocs % 1000 == 0)

		print_alloc_stats(device_info);

#endif



	write_lock_irqsave(&device_info->lock, flags);
@@ -201,15 +204,6 @@ free_safe_buffer(struct dmabounce_device_info *device_info, struct safe_buffer * 


/* ************************************************** */



#ifdef STATS

static void print_map_stats(struct dmabounce_device_info *device_info)

{

	dev_info(device_info->dev,

		"dmabounce: map_op_count=%lu, bounce_count=%lu\n",

		device_info->map_op_count, device_info->bounce_count);

}

#endif



static inline dma_addr_t

map_single(struct device *dev, void *ptr, size_t size,

		enum dma_data_direction dir)
@@ -587,6 +581,7 @@ dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size, 
	device_info->total_allocs = 0;

	device_info->map_op_count = 0;

	device_info->bounce_count = 0;

	device_info->attr_res = device_create_file(dev, &dev_attr_dmabounce_stats);

#endif



	dev->archdata.dmabounce = device_info;
@@ -630,8 +625,8 @@ dmabounce_unregister_dev(struct device *dev) 
		dma_pool_destroy(device_info->large.pool);



#ifdef STATS

	print_alloc_stats(device_info);

	print_map_stats(device_info);

	if (device_info->attr_res == 0)

		device_remove_file(dev, &dev_attr_dmabounce_stats);

#endif



	kfree(device_info);