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dma-debug: add variables and checks for driver filter

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This patch adds the state variables for the driver filter and a function
to check if the filter is enabled and matches to the current device. The
check is built into the err_printk function.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-05-22 18:24:20 +02:00
parent 41fb454ebe
commit 2e507d849f
1 changed files with 48 additions and 1 deletions
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49
lib/dma-debug.c
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@ -99,6 +99,15 @@ static struct dentry *show_num_errors_dent __read_mostly;
static struct dentry *num_free_entries_dent __read_mostly;
static struct dentry *min_free_entries_dent __read_mostly;
/* per-driver filter related state */
#define NAME_MAX_LEN 64
static char current_driver_name[NAME_MAX_LEN] __read_mostly;
static struct device_driver *current_driver __read_mostly;
static DEFINE_RWLOCK(driver_name_lock);
static const char *type2name[4] = { "single", "page",
"scather-gather", "coherent" };
@ -128,9 +137,47 @@ static inline void dump_entry_trace(struct dma_debug_entry *entry)
#endif
}
static bool driver_filter(struct device *dev)
{
/* driver filter off */
if (likely(!current_driver_name[0]))
return true;
/* driver filter on and initialized */
if (current_driver && 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;
/* lock to protect against change of current_driver_name */
read_lock_irqsave(&driver_name_lock, flags);
if (drv->name &&
strncmp(current_driver_name, drv->name, 63) == 0) {
current_driver = drv;
ret = true;
}
read_unlock_irqrestore(&driver_name_lock, flags);
put_driver(drv);
return ret;
}
return false;
}
#define err_printk(dev, entry, format, arg...) do { \
error_count += 1; \
if (show_all_errors || show_num_errors > 0) { \
if (driver_filter(dev) && \
(show_all_errors || show_num_errors > 0)) { \
WARN(1, "%s %s: " format, \
dev_driver_string(dev), \
dev_name(dev) , ## arg); \