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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2009-05-27 00:43:03 (GMT)
committerJoerg Roedel <joerg.roedel@amd.com>2009-05-29 12:27:05 (GMT)
commit88f3907f6f447899544beadf491dccb32015dacb (patch)
tree65566b6711d85b951d55982d3bcc0c7393d6ad73 /lib/dma-debug.c
parent884d05970bfbc3db368f23460dc4ce63257f240d (diff)
dma-debug: fix debug_dma_sync_sg_for_cpu and debug_dma_sync_sg_for_device
DMA-mapping.txt says that debug_dma_sync_sg family must be called with the _same_ one you passed into the dma_map_sg call, it should _NOT_ be the 'count' value _returned_ from the dma_map_sg call. debug_dma_sync_sg_for_cpu and debug_dma_sync_sg_for_device can't handle this properly; they need to use the sg_mapped_ents in struct dma_debug_entry as debug_dma_unmap_sg() does. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'lib/dma-debug.c')
-rw-r--r--lib/dma-debug.c48
1 files changed, 37 insertions, 11 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 51f95e5..1abed17 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -855,13 +855,32 @@ void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
}
EXPORT_SYMBOL(debug_dma_map_sg);
+static int get_nr_mapped_entries(struct device *dev, struct scatterlist *s)
+{
+ struct dma_debug_entry *entry;
+ struct hash_bucket *bucket;
+ unsigned long flags;
+ int mapped_ents = 0;
+ struct dma_debug_entry ref;
+
+ ref.dev = dev;
+ ref.dev_addr = sg_dma_address(s);
+ ref.size = sg_dma_len(s),
+
+ bucket = get_hash_bucket(&ref, &flags);
+ entry = hash_bucket_find(bucket, &ref);
+ if (entry)
+ mapped_ents = entry->sg_mapped_ents;
+ put_hash_bucket(bucket, &flags);
+
+ return mapped_ents;
+}
+
void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems, int dir)
{
- struct dma_debug_entry *entry;
struct scatterlist *s;
int mapped_ents = 0, i;
- unsigned long flags;
if (unlikely(global_disable))
return;
@@ -881,14 +900,9 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
if (mapped_ents && i >= mapped_ents)
break;
- if (mapped_ents == 0) {
- struct hash_bucket *bucket;
+ if (!i) {
ref.sg_call_ents = nelems;
- bucket = get_hash_bucket(&ref, &flags);
- entry = hash_bucket_find(bucket, &ref);
- if (entry)
- mapped_ents = entry->sg_mapped_ents;
- put_hash_bucket(bucket, &flags);
+ mapped_ents = get_nr_mapped_entries(dev, s);
}
check_unmap(&ref);
@@ -990,12 +1004,18 @@ void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
int nelems, int direction)
{
struct scatterlist *s;
- int i;
+ int mapped_ents = 0, i;
if (unlikely(global_disable))
return;
for_each_sg(sg, s, nelems, i) {
+ if (!i)
+ mapped_ents = get_nr_mapped_entries(dev, s);
+
+ if (i >= mapped_ents)
+ break;
+
check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
direction, true);
}
@@ -1006,12 +1026,18 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
int nelems, int direction)
{
struct scatterlist *s;
- int i;
+ int mapped_ents = 0, i;
if (unlikely(global_disable))
return;
for_each_sg(sg, s, nelems, i) {
+ if (!i)
+ mapped_ents = get_nr_mapped_entries(dev, s);
+
+ if (i >= mapped_ents)
+ break;
+
check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
direction, false);
}

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