static bool driver_filter(struct device *dev)
{
+ struct device_driver *drv;
+ unsigned long flags;
+ bool ret;
+
/* driver filter off */
if (likely(!current_driver_name[0]))
return true;
/* driver filter on and initialized */
- if (current_driver && dev->driver == current_driver)
+ if (current_driver && dev && dev->driver == current_driver)
return true;
- /* driver filter on but not yet initialized */
- if (!current_driver && current_driver_name[0]) {
- struct device_driver *drv = get_driver(dev->driver);
- unsigned long flags;
- bool ret = false;
-
- if (!drv)
- return false;
+ /* driver filter on, but we can't filter on a NULL device... */
+ if (!dev)
+ return false;
- /* lock to protect against change of current_driver_name */
- read_lock_irqsave(&driver_name_lock, flags);
+ if (current_driver || !current_driver_name[0])
+ return false;
- if (drv->name &&
- strncmp(current_driver_name, drv->name,
- NAME_MAX_LEN-1) == 0) {
- current_driver = drv;
- ret = true;
- }
+ /* driver filter on but not yet initialized */
+ drv = get_driver(dev->driver);
+ if (!drv)
+ return false;
- read_unlock_irqrestore(&driver_name_lock, flags);
- put_driver(drv);
+ /* lock to protect against change of current_driver_name */
+ read_lock_irqsave(&driver_name_lock, flags);
- return ret;
+ ret = false;
+ if (drv->name &&
+ strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) {
+ current_driver = drv;
+ ret = true;
}
- return false;
+ read_unlock_irqrestore(&driver_name_lock, flags);
+ put_driver(drv);
+
+ return ret;
}
-#define err_printk(dev, entry, format, arg...) do { \
- error_count += 1; \
- if (driver_filter(dev) && \
- (show_all_errors || show_num_errors > 0)) { \
- WARN(1, "%s %s: " format, \
- dev_driver_string(dev), \
- dev_name(dev) , ## arg); \
- dump_entry_trace(entry); \
- } \
- if (!show_all_errors && show_num_errors > 0) \
- show_num_errors -= 1; \
+#define err_printk(dev, entry, format, arg...) do { \
+ error_count += 1; \
+ if (driver_filter(dev) && \
+ (show_all_errors || show_num_errors > 0)) { \
+ WARN(1, "%s %s: " format, \
+ dev ? dev_driver_string(dev) : "NULL", \
+ dev ? dev_name(dev) : "NULL", ## arg); \
+ dump_entry_trace(entry); \
+ } \
+ if (!show_all_errors && show_num_errors > 0) \
+ show_num_errors -= 1; \
} while (0);
/*
* times. Without a hardware IOMMU this results in the
* same device addresses being put into the dma-debug
* hash multiple times too. This can result in false
- * positives being reported. Therfore we implement a
+ * positives being reported. Therefore we implement a
* best-fit algorithm here which returns the entry from
* the hash which fits best to the reference value
* instead of the first-fit.
*/
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) {
* Now parse out the first token and use it as the name for the
* driver to filter for.
*/
- for (i = 0; i < NAME_MAX_LEN; ++i) {
+ for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
current_driver_name[i] = buf[i];
if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
break;
return count;
}
-const struct file_operations filter_fops = {
+static const struct file_operations filter_fops = {
.read = filter_read,
.write = filter_write,
};
unsigned long flags;
int count = 0, i;
+ local_irq_save(flags);
+
for (i = 0; i < HASH_SIZE; ++i) {
- spin_lock_irqsave(&dma_entry_hash[i].lock, flags);
+ spin_lock(&dma_entry_hash[i].lock);
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);
+ spin_unlock(&dma_entry_hash[i].lock);
}
+ local_irq_restore(flags);
+
return count;
}
-static int dma_debug_device_change(struct notifier_block *nb,
- unsigned long action, void *data)
+static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data)
{
struct device *dev = data;
int count;
+ if (global_disable)
+ return 0;
switch (action) {
case BUS_NOTIFY_UNBOUND_DRIVER:
{
struct notifier_block *nb;
+ if (global_disable)
+ return;
+
nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
if (nb == NULL) {
pr_err("dma_debug_add_bus: out of memory\n");
for (i = 0; i < HASH_SIZE; ++i) {
INIT_LIST_HEAD(&dma_entry_hash[i].list);
- dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED;
+ spin_lock_init(&dma_entry_hash[i].lock);
}
if (dma_debug_fs_init() != 0) {
err_printk(ref->dev, entry, "DMA-API: device driver frees "
"DMA memory with different CPU address "
"[device address=0x%016llx] [size=%llu bytes] "
- "[cpu alloc address=%p] [cpu free address=%p]",
+ "[cpu alloc address=0x%016llx] "
+ "[cpu free address=0x%016llx]",
ref->dev_addr, ref->size,
- (void *)entry->paddr, (void *)ref->paddr);
+ (unsigned long long)entry->paddr,
+ (unsigned long long)ref->paddr);
}
if (ref->sg_call_ents && ref->type == dma_debug_sg &&
"stack [addr=%p]\n", addr);
}
-static inline bool overlap(void *addr, u64 size, void *start, void *end)
+static inline bool overlap(void *addr, unsigned long len, void *start, void *end)
{
- void *addr2 = (char *)addr + size;
+ unsigned long a1 = (unsigned long)addr;
+ unsigned long b1 = a1 + len;
+ unsigned long a2 = (unsigned long)start;
+ unsigned long b2 = (unsigned long)end;
- return ((addr >= start && addr < end) ||
- (addr2 >= start && addr2 < end) ||
- ((addr < start) && (addr2 >= end)));
+ return !(b1 <= a2 || a1 >= b2);
}
-static void check_for_illegal_area(struct device *dev, void *addr, u64 size)
+static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
{
- if (overlap(addr, size, _text, _etext) ||
- overlap(addr, size, __start_rodata, __end_rodata))
- err_printk(dev, NULL, "DMA-API: device driver maps "
- "memory from kernel text or rodata "
- "[addr=%p] [size=%llu]\n", addr, size);
+ if (overlap(addr, len, _text, _etext) ||
+ overlap(addr, len, __start_rodata, __end_rodata))
+ err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len);
}
-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 (entry->direction == DMA_BIDIRECTIONAL)
+ goto out;
+
+ 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);
-
}
void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
entry->type = dma_debug_single;
if (!PageHighMem(page)) {
- void *addr = ((char *)page_address(page)) + offset;
+ void *addr = page_address(page) + offset;
+
check_for_stack(dev, addr);
check_for_illegal_area(dev, addr, size);
}
}
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)
.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);
}
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);
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);
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);
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);
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);
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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff