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author | Joerg Roedel <joerg.roedel@amd.com> | 2009-03-16 17:32:14 +0100 |
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committer | Joerg Roedel <joerg.roedel@amd.com> | 2009-03-17 12:56:49 +0100 |
commit | 41531c8f5f05aba5ec645d9770557eedbf75b422 (patch) | |
tree | 7635e68efbee5ea7b5208e5d4b332f6ef2113dd3 /lib/dma-debug.c | |
parent | dma-debug: add checks for kernel text and rodata (diff) | |
download | linux-41531c8f5f05aba5ec645d9770557eedbf75b422.tar.xz linux-41531c8f5f05aba5ec645d9770557eedbf75b422.zip |
dma-debug: add a check dma memory leaks
Impact: allow architectures to monitor busses for dma mem leakage
This patch adds checking code to detect if a device has pending DMA
operations when it is about to be unbound from its device driver.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'lib/dma-debug.c')
-rw-r--r-- | lib/dma-debug.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c index 6022eb4a0cd0..9a350b414a50 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -400,6 +400,61 @@ 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_UNBIND_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) +{ + 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); +} /* * Let the architectures decide how many entries should be preallocated. |