dma-debug: add hash functions for dma_debug_entries

Impact: implement necessary functions for the core hash

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 31099712328c..5ff7d2e2b60e 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -18,9 +18,14 @@
  */
 
 #include <linux/dma-debug.h>
+#include <linux/spinlock.h>
 #include <linux/types.h>
 #include <linux/list.h>
 
+#define HASH_SIZE       1024ULL
+#define HASH_FN_SHIFT   13
+#define HASH_FN_MASK    (HASH_SIZE - 1)
+
 enum {
         dma_debug_single,
         dma_debug_page,
@@ -40,3 +45,99 @@ struct dma_debug_entry {
         int              sg_mapped_ents;
 };
 
+struct hash_bucket {
+        struct list_head list;
+        spinlock_t lock;
+} __cacheline_aligned_in_smp;
+
+/* Hash list to save the allocated dma addresses */
+static struct hash_bucket dma_entry_hash[HASH_SIZE];
+
+/*
+ * Hash related functions
+ *
+ * Every DMA-API request is saved into a struct dma_debug_entry. To
+ * have quick access to these structs they are stored into a hash.
+ */
+static int hash_fn(struct dma_debug_entry *entry)
+{
+        /*
+         * Hash function is based on the dma address.
+         * We use bits 20-27 here as the index into the hash
+         */
+        return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK;
+}
+
+/*
+ * Request exclusive access to a hash bucket for a given dma_debug_entry.
+ */
+static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
+                                           unsigned long *flags)
+{
+        int idx = hash_fn(entry);
+        unsigned long __flags;
+
+        spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
+        *flags = __flags;
+        return &dma_entry_hash[idx];
+}
+
+/*
+ * Give up exclusive access to the hash bucket
+ */
+static void put_hash_bucket(struct hash_bucket *bucket,
+                            unsigned long *flags)
+{
+        unsigned long __flags = *flags;
+
+        spin_unlock_irqrestore(&bucket->lock, __flags);
+}
+
+/*
+ * 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)
+{
+        struct dma_debug_entry *entry;
+
+        list_for_each_entry(entry, &bucket->list, list) {
+                if ((entry->dev_addr == ref->dev_addr) &&
+                    (entry->dev == ref->dev))
+                        return entry;
+        }
+
+        return NULL;
+}
+
+/*
+ * Add an entry to a hash bucket
+ */
+static void hash_bucket_add(struct hash_bucket *bucket,
+                            struct dma_debug_entry *entry)
+{
+        list_add_tail(&entry->list, &bucket->list);
+}
+
+/*
+ * Remove entry from a hash bucket list
+ */
+static void hash_bucket_del(struct dma_debug_entry *entry)
+{
+        list_del(&entry->list);
+}
+
+/*
+ * Wrapper function for adding an entry to the hash.
+ * This function takes care of locking itself.
+ */
+static void add_dma_entry(struct dma_debug_entry *entry)
+{
+        struct hash_bucket *bucket;
+        unsigned long flags;
+
+        bucket = get_hash_bucket(entry, &flags);
+        hash_bucket_add(bucket, entry);
+        put_hash_bucket(bucket, &flags);
+}
+