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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 <sgruszka@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Stanislaw Gruszka 2011-03-31 08:08:09 -04:00 committed by Joerg Roedel
parent 6221f222c0
commit ba4b87ad54
1 changed files with 13 additions and 5 deletions
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18
lib/dma-debug.c
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@ -649,7 +649,7 @@ static int dma_debug_fs_init(void)
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;