[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: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index 490e1fe..4d5b031a 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -32,7 +32,6 @@
#include <asm/cacheflush.h>
-#undef DEBUG
#undef STATS
#ifdef STATS
@@ -72,6 +71,7 @@
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 @@
};
#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 @@
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 @@
/* ************************************************** */
-#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 @@
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 @@
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);