Merge commit 'v2.6.30-rc5' into core/iommu

[linux.git] / lib / dma-debug.c

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 69da09a085a1943ea6a70f4871fd2df1683110fb..cdd205d6bf7c6bab0afa0679c26f04acce3955dd 100644 (file)
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -85,6 +85,7 @@ static u32 show_num_errors = 1;
 
 static u32 num_free_entries;
 static u32 min_free_entries;
+static u32 nr_total_entries;
 
 /* number of preallocated entries requested by kernel cmdline */
 static u32 req_entries;
@@ -257,6 +258,21 @@ static void add_dma_entry(struct dma_debug_entry *entry)
        put_hash_bucket(bucket, &flags);
 }
 
+static struct dma_debug_entry *__dma_entry_alloc(void)
+{
+       struct dma_debug_entry *entry;
+
+       entry = list_entry(free_entries.next, struct dma_debug_entry, list);
+       list_del(&entry->list);
+       memset(entry, 0, sizeof(*entry));
+
+       num_free_entries -= 1;
+       if (num_free_entries < min_free_entries)
+               min_free_entries = num_free_entries;
+
+       return entry;
+}
+
 /* struct dma_entry allocator
  *
  * The next two functions implement the allocator for
@@ -276,9 +292,7 @@ static struct dma_debug_entry *dma_entry_alloc(void)
                goto out;
        }
 
-       entry = list_entry(free_entries.next, struct dma_debug_entry, list);
-       list_del(&entry->list);
-       memset(entry, 0, sizeof(*entry));
+       entry = __dma_entry_alloc();
 
 #ifdef CONFIG_STACKTRACE
        entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
@@ -286,9 +300,6 @@ static struct dma_debug_entry *dma_entry_alloc(void)
        entry->stacktrace.skip = 2;
        save_stack_trace(&entry->stacktrace);
 #endif
-       num_free_entries -= 1;
-       if (num_free_entries < min_free_entries)
-               min_free_entries = num_free_entries;
 
 out:
        spin_unlock_irqrestore(&free_entries_lock, flags);
@@ -310,6 +321,53 @@ static void dma_entry_free(struct dma_debug_entry *entry)
        spin_unlock_irqrestore(&free_entries_lock, flags);
 }
 
+int dma_debug_resize_entries(u32 num_entries)
+{
+       int i, delta, ret = 0;
+       unsigned long flags;
+       struct dma_debug_entry *entry;
+       LIST_HEAD(tmp);
+
+       spin_lock_irqsave(&free_entries_lock, flags);
+
+       if (nr_total_entries < num_entries) {
+               delta = num_entries - nr_total_entries;
+
+               spin_unlock_irqrestore(&free_entries_lock, flags);
+
+               for (i = 0; i < delta; i++) {
+                       entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+                       if (!entry)
+                               break;
+
+                       list_add_tail(&entry->list, &tmp);
+               }
+
+               spin_lock_irqsave(&free_entries_lock, flags);
+
+               list_splice(&tmp, &free_entries);
+               nr_total_entries += i;
+               num_free_entries += i;
+       } else {
+               delta = nr_total_entries - num_entries;
+
+               for (i = 0; i < delta && !list_empty(&free_entries); i++) {
+                       entry = __dma_entry_alloc();
+                       kfree(entry);
+               }
+
+               nr_total_entries -= i;
+       }
+
+       if (nr_total_entries != num_entries)
+               ret = 1;
+
+       spin_unlock_irqrestore(&free_entries_lock, flags);
+
+       return ret;
+}
+EXPORT_SYMBOL(dma_debug_resize_entries);
+
 /*
  * DMA-API debugging init code
  *
@@ -439,6 +497,8 @@ void dma_debug_init(u32 num_entries)
                return;
        }
 
+       nr_total_entries = num_free_entries;
+
        printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n");
 }