dma-debug: re-add dma memory leak detection

This is basically a revert of commit 314eeac9 but now in a
fixed version.

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

1 files changed, 57 insertions, 1 deletions

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index cdd205d6bf7c..e47e1a08c337 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -105,6 +105,11 @@ static const char *type2name[4] = { "single", "page",
 static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
                                    "DMA_FROM_DEVICE", "DMA_NONE" };
 
+/* little merge helper - remove it after the merge window */
+#ifndef BUS_NOTIFY_UNBOUND_DRIVER
+#define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
+#endif
+
 /*
  * The access to some variables in this macro is racy. We can't use atomic_t
  * here because all these variables are exported to debugfs. Some of them even
@@ -458,9 +463,60 @@ out_err:
         return -ENOMEM;
 }
 
+static int device_dma_allocations(struct device *dev)
+{
+        struct dma_debug_entry *entry;
+        unsigned long flags;
+        int count = 0, i;
+
+        for (i = 0; i < HASH_SIZE; ++i) {
+                spin_lock_irqsave(&dma_entry_hash[i].lock, flags);
+                list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
+                        if (entry->dev == dev)
+                                count += 1;
+                }
+                spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags);
+        }
+
+        return count;
+}
+
+static int dma_debug_device_change(struct notifier_block *nb,
+                                    unsigned long action, void *data)
+{
+        struct device *dev = data;
+        int count;
+
+
+        switch (action) {
+        case BUS_NOTIFY_UNBOUND_DRIVER:
+                count = device_dma_allocations(dev);
+                if (count == 0)
+                        break;
+                err_printk(dev, NULL, "DMA-API: device driver has pending "
+                                "DMA allocations while released from device "
+                                "[count=%d]\n", count);
+                break;
+        default:
+                break;
+        }
+
+        return 0;
+}
+
 void dma_debug_add_bus(struct bus_type *bus)
 {
-        /* FIXME: register notifier */
+        struct notifier_block *nb;
+
+        nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
+        if (nb == NULL) {
+                printk(KERN_ERR "dma_debug_add_bus: out of memory\n");
+                return;
+        }
+
+        nb->notifier_call = dma_debug_device_change;
+
+        bus_register_notifier(bus, nb);
 }
 
 /*