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-rw-r--r--lib/Kconfig.debug7
-rw-r--r--lib/dma-debug.c149
2 files changed, 102 insertions, 54 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 6b0c2d8a2129..4c32b1a1a06e 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -340,8 +340,6 @@ config DEBUG_KMEMLEAK
bool "Kernel memory leak detector"
depends on DEBUG_KERNEL && EXPERIMENTAL && (X86 || ARM) && \
!MEMORY_HOTPLUG
- select DEBUG_SLAB if SLAB
- select SLUB_DEBUG if SLUB
select DEBUG_FS if SYSFS
select STACKTRACE if STACKTRACE_SUPPORT
select KALLSYMS
@@ -355,6 +353,9 @@ config DEBUG_KMEMLEAK
allocations. See Documentation/kmemleak.txt for more
details.
+ Enabling DEBUG_SLAB or SLUB_DEBUG may increase the chances
+ of finding leaks due to the slab objects poisoning.
+
In order to access the kmemleak file, debugfs needs to be
mounted (usually at /sys/kernel/debug).
@@ -472,7 +473,7 @@ config LOCKDEP
bool
depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
select STACKTRACE
- select FRAME_POINTER if !X86 && !MIPS && !PPC && !ARM_UNWIND && !S390
+ select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390
select KALLSYMS
select KALLSYMS_ALL
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index ad65fc0317d9..3b93129a968c 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -262,11 +262,12 @@ static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket,
*/
matches += 1;
match_lvl = 0;
- entry->size == ref->size ? ++match_lvl : match_lvl;
- entry->type == ref->type ? ++match_lvl : match_lvl;
- entry->direction == ref->direction ? ++match_lvl : match_lvl;
+ entry->size == ref->size ? ++match_lvl : 0;
+ entry->type == ref->type ? ++match_lvl : 0;
+ entry->direction == ref->direction ? ++match_lvl : 0;
+ entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0;
- if (match_lvl == 3) {
+ if (match_lvl == 4) {
/* perfect-fit - return the result */
return entry;
} else if (match_lvl > last_lvl) {
@@ -873,72 +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);
@@ -1036,19 +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)
@@ -1076,16 +1070,14 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
.dev_addr = sg_dma_address(s),
.size = sg_dma_len(s),
.direction = dir,
- .sg_call_ents = 0,
+ .sg_call_ents = nelems,
};
if (mapped_ents && i >= mapped_ents)
break;
- if (!i) {
- ref.sg_call_ents = nelems;
- mapped_ents = get_nr_mapped_entries(dev, s);
- }
+ if (!i)
+ mapped_ents = get_nr_mapped_entries(dev, &ref);
check_unmap(&ref);
}
@@ -1140,10 +1132,19 @@ 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);
@@ -1151,10 +1152,19 @@ 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);
@@ -1163,10 +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);
@@ -1175,10 +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);
@@ -1192,14 +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);
@@ -1214,14 +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);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-17 08:07:04 +0000