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-rw-r--r--mm/cma_debug.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/mm/cma_debug.c b/mm/cma_debug.c
index 0b377536ccde..a040bfb132c3 100644
--- a/mm/cma_debug.c
+++ b/mm/cma_debug.c
@@ -33,6 +33,44 @@ static int cma_debugfs_get(void *data, u64 *val)
DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n");
+static int cma_used_get(void *data, u64 *val)
+{
+ struct cma *cma = data;
+ unsigned long used;
+
+ mutex_lock(&cma->lock);
+ /* pages counter is smaller than sizeof(int) */
+ used = bitmap_weight(cma->bitmap, (int)cma->count);
+ mutex_unlock(&cma->lock);
+ *val = (u64)used << cma->order_per_bit;
+
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(cma_used_fops, cma_used_get, NULL, "%llu\n");
+
+static int cma_maxchunk_get(void *data, u64 *val)
+{
+ struct cma *cma = data;
+ unsigned long maxchunk = 0;
+ unsigned long start, end = 0;
+
+ mutex_lock(&cma->lock);
+ for (;;) {
+ start = find_next_zero_bit(cma->bitmap, cma->count, end);
+ if (start >= cma->count)
+ break;
+ end = find_next_bit(cma->bitmap, cma->count, start);
+ maxchunk = max(end - start, maxchunk);
+ }
+ mutex_unlock(&cma->lock);
+ *val = (u64)maxchunk << cma->order_per_bit;
+
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(cma_maxchunk_fops, cma_maxchunk_get, NULL, "%llu\n");
+
static void cma_add_to_cma_mem_list(struct cma *cma, struct cma_mem *mem)
{
spin_lock(&cma->mem_head_lock);
@@ -149,6 +187,8 @@ static void cma_debugfs_add_one(struct cma *cma, int idx)
&cma->count, &cma_debugfs_fops);
debugfs_create_file("order_per_bit", S_IRUGO, tmp,
&cma->order_per_bit, &cma_debugfs_fops);
+ debugfs_create_file("used", S_IRUGO, tmp, cma, &cma_used_fops);
+ debugfs_create_file("maxchunk", S_IRUGO, tmp, cma, &cma_maxchunk_fops);
u32s = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32));
debugfs_create_u32_array("bitmap", S_IRUGO, tmp, (u32*)cma->bitmap, u32s);