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dma-debug: be more careful when building reference entries
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The current code is not very careful when it builds reference
dma_debug_entries which get passed to hash_bucket_find(). But since this
function changed to a best-fit algorithm these entries have to be more
acurate. This patch adds this higher level of accuracy.

Signed-off-by: Joerg Roedel <[email protected]>
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Joerg Roedel committed Jun 15, 2009
1 parent e5e8c5b commit aa010ef
Showing 1 changed file with 91 additions and 43 deletions.
134 changes: 91 additions & 43 deletions lib/dma-debug.c
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Original file line number Diff line number Diff line change
Expand Up @@ -874,72 +874,68 @@ static void check_for_illegal_area(struct device *dev, void *addr, u64 size)
"[addr=%p] [size=%llu]\n", addr, size);
}

static void check_sync(struct device *dev, dma_addr_t addr,
u64 size, u64 offset, int direction, bool to_cpu)
static void check_sync(struct device *dev,
struct dma_debug_entry *ref,
bool to_cpu)
{
struct dma_debug_entry ref = {
.dev = dev,
.dev_addr = addr,
.size = size,
.direction = direction,
};
struct dma_debug_entry *entry;
struct hash_bucket *bucket;
unsigned long flags;

bucket = get_hash_bucket(&ref, &flags);
bucket = get_hash_bucket(ref, &flags);

entry = hash_bucket_find(bucket, &ref);
entry = hash_bucket_find(bucket, ref);

if (!entry) {
err_printk(dev, NULL, "DMA-API: device driver tries "
"to sync DMA memory it has not allocated "
"[device address=0x%016llx] [size=%llu bytes]\n",
(unsigned long long)addr, size);
(unsigned long long)ref->dev_addr, ref->size);
goto out;
}

if ((offset + size) > entry->size) {
if (ref->size > entry->size) {
err_printk(dev, entry, "DMA-API: device driver syncs"
" DMA memory outside allocated range "
"[device address=0x%016llx] "
"[allocation size=%llu bytes] [sync offset=%llu] "
"[sync size=%llu]\n", entry->dev_addr, entry->size,
offset, size);
"[allocation size=%llu bytes] "
"[sync offset+size=%llu]\n",
entry->dev_addr, entry->size,
ref->size);
}

if (direction != entry->direction) {
if (ref->direction != entry->direction) {
err_printk(dev, entry, "DMA-API: device driver syncs "
"DMA memory with different direction "
"[device address=0x%016llx] [size=%llu bytes] "
"[mapped with %s] [synced with %s]\n",
(unsigned long long)addr, entry->size,
(unsigned long long)ref->dev_addr, entry->size,
dir2name[entry->direction],
dir2name[direction]);
dir2name[ref->direction]);
}

if (entry->direction == DMA_BIDIRECTIONAL)
goto out;

if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
!(direction == DMA_TO_DEVICE))
!(ref->direction == DMA_TO_DEVICE))
err_printk(dev, entry, "DMA-API: device driver syncs "
"device read-only DMA memory for cpu "
"[device address=0x%016llx] [size=%llu bytes] "
"[mapped with %s] [synced with %s]\n",
(unsigned long long)addr, entry->size,
(unsigned long long)ref->dev_addr, entry->size,
dir2name[entry->direction],
dir2name[direction]);
dir2name[ref->direction]);

if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
!(direction == DMA_FROM_DEVICE))
!(ref->direction == DMA_FROM_DEVICE))
err_printk(dev, entry, "DMA-API: device driver syncs "
"device write-only DMA memory to device "
"[device address=0x%016llx] [size=%llu bytes] "
"[mapped with %s] [synced with %s]\n",
(unsigned long long)addr, entry->size,
(unsigned long long)ref->dev_addr, entry->size,
dir2name[entry->direction],
dir2name[direction]);
dir2name[ref->direction]);

out:
put_hash_bucket(bucket, &flags);
Expand Down Expand Up @@ -1037,19 +1033,16 @@ 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)
static int get_nr_mapped_entries(struct device *dev,
struct dma_debug_entry *ref)
{
struct dma_debug_entry *entry, ref;
struct dma_debug_entry *entry;
struct hash_bucket *bucket;
unsigned long flags;
int mapped_ents;

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);
bucket = get_hash_bucket(ref, &flags);
entry = hash_bucket_find(bucket, ref);
mapped_ents = 0;

if (entry)
Expand Down Expand Up @@ -1084,7 +1077,7 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
break;

if (!i)
mapped_ents = get_nr_mapped_entries(dev, s);
mapped_ents = get_nr_mapped_entries(dev, &ref);

check_unmap(&ref);
}
Expand Down Expand Up @@ -1139,21 +1132,39 @@ EXPORT_SYMBOL(debug_dma_free_coherent);
void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
size_t size, int direction)
{
struct dma_debug_entry ref;

if (unlikely(global_disable))
return;

check_sync(dev, dma_handle, size, 0, direction, true);
ref.type = dma_debug_single;
ref.dev = dev;
ref.dev_addr = dma_handle;
ref.size = size;
ref.direction = direction;
ref.sg_call_ents = 0;

check_sync(dev, &ref, true);
}
EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);

void debug_dma_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size,
int direction)
{
struct dma_debug_entry ref;

if (unlikely(global_disable))
return;

check_sync(dev, dma_handle, size, 0, direction, false);
ref.type = dma_debug_single;
ref.dev = dev;
ref.dev_addr = dma_handle;
ref.size = size;
ref.direction = direction;
ref.sg_call_ents = 0;

check_sync(dev, &ref, false);
}
EXPORT_SYMBOL(debug_dma_sync_single_for_device);

Expand All @@ -1162,10 +1173,19 @@ void debug_dma_sync_single_range_for_cpu(struct device *dev,
unsigned long offset, size_t size,
int direction)
{
struct dma_debug_entry ref;

if (unlikely(global_disable))
return;

check_sync(dev, dma_handle, size, offset, direction, true);
ref.type = dma_debug_single;
ref.dev = dev;
ref.dev_addr = dma_handle;
ref.size = offset + size;
ref.direction = direction;
ref.sg_call_ents = 0;

check_sync(dev, &ref, true);
}
EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);

Expand All @@ -1174,10 +1194,19 @@ void debug_dma_sync_single_range_for_device(struct device *dev,
unsigned long offset,
size_t size, int direction)
{
struct dma_debug_entry ref;

if (unlikely(global_disable))
return;

check_sync(dev, dma_handle, size, offset, direction, false);
ref.type = dma_debug_single;
ref.dev = dev;
ref.dev_addr = dma_handle;
ref.size = offset + size;
ref.direction = direction;
ref.sg_call_ents = 0;

check_sync(dev, &ref, false);
}
EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);

Expand All @@ -1191,14 +1220,24 @@ void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
return;

for_each_sg(sg, s, nelems, i) {

struct dma_debug_entry ref = {
.type = dma_debug_sg,
.dev = dev,
.paddr = sg_phys(s),
.dev_addr = sg_dma_address(s),
.size = sg_dma_len(s),
.direction = direction,
.sg_call_ents = nelems,
};

if (!i)
mapped_ents = get_nr_mapped_entries(dev, s);
mapped_ents = get_nr_mapped_entries(dev, &ref);

if (i >= mapped_ents)
break;

check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
direction, true);
check_sync(dev, &ref, true);
}
}
EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
Expand All @@ -1213,14 +1252,23 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
return;

for_each_sg(sg, s, nelems, i) {

struct dma_debug_entry ref = {
.type = dma_debug_sg,
.dev = dev,
.paddr = sg_phys(s),
.dev_addr = sg_dma_address(s),
.size = sg_dma_len(s),
.direction = direction,
.sg_call_ents = nelems,
};
if (!i)
mapped_ents = get_nr_mapped_entries(dev, s);
mapped_ents = get_nr_mapped_entries(dev, &ref);

if (i >= mapped_ents)
break;

check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
direction, false);
check_sync(dev, &ref, false);
}
}
EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
Expand Down

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