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-rw-r--r--lib/dma-debug.c69
1 files changed, 62 insertions, 7 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index db07bfd..74c6c7f 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -24,6 +24,7 @@
#include <linux/spinlock.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
+#include <linux/export.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/sched.h>
@@ -62,6 +63,8 @@ struct dma_debug_entry {
#endif
};
+typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *);
+
struct hash_bucket {
struct list_head list;
spinlock_t lock;
@@ -240,18 +243,37 @@ static void put_hash_bucket(struct hash_bucket *bucket,
spin_unlock_irqrestore(&bucket->lock, __flags);
}
+static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b)
+{
+ return ((a->dev_addr == a->dev_addr) &&
+ (a->dev == b->dev)) ? true : false;
+}
+
+static bool containing_match(struct dma_debug_entry *a,
+ struct dma_debug_entry *b)
+{
+ if (a->dev != b->dev)
+ return false;
+
+ if ((b->dev_addr <= a->dev_addr) &&
+ ((b->dev_addr + b->size) >= (a->dev_addr + a->size)))
+ return true;
+
+ return false;
+}
+
/*
* Search a given entry in the hash bucket list
*/
-static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket,
- struct dma_debug_entry *ref)
+static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket,
+ struct dma_debug_entry *ref,
+ match_fn match)
{
struct dma_debug_entry *entry, *ret = NULL;
int matches = 0, match_lvl, last_lvl = 0;
list_for_each_entry(entry, &bucket->list, list) {
- if ((entry->dev_addr != ref->dev_addr) ||
- (entry->dev != ref->dev))
+ if (!match(ref, entry))
continue;
/*
@@ -293,6 +315,39 @@ static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket,
return ret;
}
+static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket,
+ struct dma_debug_entry *ref)
+{
+ return __hash_bucket_find(bucket, ref, exact_match);
+}
+
+static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket,
+ struct dma_debug_entry *ref,
+ unsigned long *flags)
+{
+
+ unsigned int max_range = dma_get_max_seg_size(ref->dev);
+ struct dma_debug_entry *entry, index = *ref;
+ unsigned int range = 0;
+
+ while (range <= max_range) {
+ entry = __hash_bucket_find(*bucket, &index, containing_match);
+
+ if (entry)
+ return entry;
+
+ /*
+ * Nothing found, go back a hash bucket
+ */
+ put_hash_bucket(*bucket, flags);
+ range += (1 << HASH_FN_SHIFT);
+ index.dev_addr -= (1 << HASH_FN_SHIFT);
+ *bucket = get_hash_bucket(&index, flags);
+ }
+
+ return NULL;
+}
+
/*
* Add an entry to a hash bucket
*/
@@ -802,7 +857,7 @@ static void check_unmap(struct dma_debug_entry *ref)
}
bucket = get_hash_bucket(ref, &flags);
- entry = hash_bucket_find(bucket, ref);
+ entry = bucket_find_exact(bucket, ref);
if (!entry) {
err_printk(ref->dev, NULL, "DMA-API: device driver tries "
@@ -902,7 +957,7 @@ static void check_sync(struct device *dev,
bucket = get_hash_bucket(ref, &flags);
- entry = hash_bucket_find(bucket, ref);
+ entry = bucket_find_contain(&bucket, ref, &flags);
if (!entry) {
err_printk(dev, NULL, "DMA-API: device driver tries "
@@ -1060,7 +1115,7 @@ static int get_nr_mapped_entries(struct device *dev,
int mapped_ents;
bucket = get_hash_bucket(ref, &flags);
- entry = hash_bucket_find(bucket, ref);
+ entry = bucket_find_exact(bucket, ref);
mapped_ents = 0;
if (entry)
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