[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>

1 files changed, 15 insertions, 20 deletions

diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index 490e1fe286d5..4d5b031ac745 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 @@ 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);