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authorJoerg Roedel <joerg.roedel@amd.com>2009-05-22 17:16:04 +0200
committerJoerg Roedel <joerg.roedel@amd.com>2009-05-28 17:09:07 +0200
commited888aef427365d19f887c271a3a906d16422d24 (patch)
tree31788a63f76e73e12ea5ef7f2374cd42a1b24846 /lib/dma-debug.c
parent41fb454ebe6024f5c1e3b3cbc0abc0da762e7b51 (diff)
downloadlinux-stericsson-ed888aef427365d19f887c271a3a906d16422d24.tar.gz
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>
Diffstat (limited to 'lib/dma-debug.c')
-rw-r--r--lib/dma-debug.c58
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);
}
/*