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[ARM] Convert dmabounce statistics to use a device attribute

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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: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2007-02-12 10:53:50 +00:00 committed by Russell King
parent ab2c21529d
commit 017cc022b6
1 changed files with 15 additions and 20 deletions
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35
arch/arm/common/dmabounce.c
View file

@ -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);