From ba4b87ad5497cba555954885db99c99627f93748 Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Thu, 31 Mar 2011 08:08:09 -0400 Subject: dma-debug: print information about leaked entry When driver leak dma mapping, print additional information about one of leaked entries, to to help investigate problem. Patch should be useful for debugging drivers, which maps many different class of buffers. Signed-off-by: Stanislaw Gruszka Signed-off-by: Joerg Roedel --- lib/dma-debug.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) (limited to 'lib') diff --git a/lib/dma-debug.c b/lib/dma-debug.c index 4bfb0471f106..db07bfd9298e 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -649,7 +649,7 @@ out_err: return -ENOMEM; } -static int device_dma_allocations(struct device *dev) +static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry) { struct dma_debug_entry *entry; unsigned long flags; @@ -660,8 +660,10 @@ static int device_dma_allocations(struct device *dev) for (i = 0; i < HASH_SIZE; ++i) { spin_lock(&dma_entry_hash[i].lock); list_for_each_entry(entry, &dma_entry_hash[i].list, list) { - if (entry->dev == dev) + if (entry->dev == dev) { count += 1; + *out_entry = entry; + } } spin_unlock(&dma_entry_hash[i].lock); } @@ -674,6 +676,7 @@ static int device_dma_allocations(struct device *dev) static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data) { struct device *dev = data; + struct dma_debug_entry *uninitialized_var(entry); int count; if (global_disable) @@ -681,12 +684,17 @@ static int dma_debug_device_change(struct notifier_block *nb, unsigned long acti switch (action) { case BUS_NOTIFY_UNBOUND_DRIVER: - count = device_dma_allocations(dev); + count = device_dma_allocations(dev, &entry); if (count == 0) break; - err_printk(dev, NULL, "DMA-API: device driver has pending " + err_printk(dev, entry, "DMA-API: device driver has pending " "DMA allocations while released from device " - "[count=%d]\n", count); + "[count=%d]\n" + "One of leaked entries details: " + "[device address=0x%016llx] [size=%llu bytes] " + "[mapped with %s] [mapped as %s]\n", + count, entry->dev_addr, entry->size, + dir2name[entry->direction], type2name[entry->type]); break; default: break; -- cgit v1.2.3-70-g09d2