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-rw-r--r--kernel/dma/debug.c108
1 files changed, 36 insertions, 72 deletions
diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index 23cf5361bcf1..45d51e8e26f6 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -134,17 +134,6 @@ static u32 nr_total_entries;
/* number of preallocated entries requested by kernel cmdline */
static u32 nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
-/* debugfs dentry's for the stuff above */
-static struct dentry *dma_debug_dent __read_mostly;
-static struct dentry *global_disable_dent __read_mostly;
-static struct dentry *error_count_dent __read_mostly;
-static struct dentry *show_all_errors_dent __read_mostly;
-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;
-static struct dentry *nr_total_entries_dent __read_mostly;
-static struct dentry *filter_dent __read_mostly;
-
/* per-driver filter related state */
#define NAME_MAX_LEN 64
@@ -840,66 +829,46 @@ static const struct file_operations filter_fops = {
.llseek = default_llseek,
};
-static int dma_debug_fs_init(void)
+static int dump_show(struct seq_file *seq, void *v)
{
- dma_debug_dent = debugfs_create_dir("dma-api", NULL);
- if (!dma_debug_dent) {
- pr_err("can not create debugfs directory\n");
- return -ENOMEM;
- }
+ int idx;
- global_disable_dent = debugfs_create_bool("disabled", 0444,
- dma_debug_dent,
- &global_disable);
- if (!global_disable_dent)
- goto out_err;
-
- error_count_dent = debugfs_create_u32("error_count", 0444,
- dma_debug_dent, &error_count);
- if (!error_count_dent)
- goto out_err;
-
- show_all_errors_dent = debugfs_create_u32("all_errors", 0644,
- dma_debug_dent,
- &show_all_errors);
- if (!show_all_errors_dent)
- goto out_err;
-
- show_num_errors_dent = debugfs_create_u32("num_errors", 0644,
- dma_debug_dent,
- &show_num_errors);
- if (!show_num_errors_dent)
- goto out_err;
-
- num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444,
- dma_debug_dent,
- &num_free_entries);
- if (!num_free_entries_dent)
- goto out_err;
-
- min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444,
- dma_debug_dent,
- &min_free_entries);
- if (!min_free_entries_dent)
- goto out_err;
-
- nr_total_entries_dent = debugfs_create_u32("nr_total_entries", 0444,
- dma_debug_dent,
- &nr_total_entries);
- if (!nr_total_entries_dent)
- goto out_err;
-
- filter_dent = debugfs_create_file("driver_filter", 0644,
- dma_debug_dent, NULL, &filter_fops);
- if (!filter_dent)
- goto out_err;
+ for (idx = 0; idx < HASH_SIZE; idx++) {
+ struct hash_bucket *bucket = &dma_entry_hash[idx];
+ struct dma_debug_entry *entry;
+ unsigned long flags;
+ spin_lock_irqsave(&bucket->lock, flags);
+ list_for_each_entry(entry, &bucket->list, list) {
+ seq_printf(seq,
+ "%s %s %s idx %d P=%llx N=%lx D=%llx L=%llx %s %s\n",
+ dev_name(entry->dev),
+ dev_driver_string(entry->dev),
+ type2name[entry->type], idx,
+ phys_addr(entry), entry->pfn,
+ entry->dev_addr, entry->size,
+ dir2name[entry->direction],
+ maperr2str[entry->map_err_type]);
+ }
+ spin_unlock_irqrestore(&bucket->lock, flags);
+ }
return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(dump);
-out_err:
- debugfs_remove_recursive(dma_debug_dent);
-
- return -ENOMEM;
+static void dma_debug_fs_init(void)
+{
+ struct dentry *dentry = debugfs_create_dir("dma-api", NULL);
+
+ debugfs_create_bool("disabled", 0444, dentry, &global_disable);
+ debugfs_create_u32("error_count", 0444, dentry, &error_count);
+ debugfs_create_u32("all_errors", 0644, dentry, &show_all_errors);
+ debugfs_create_u32("num_errors", 0644, dentry, &show_num_errors);
+ debugfs_create_u32("num_free_entries", 0444, dentry, &num_free_entries);
+ debugfs_create_u32("min_free_entries", 0444, dentry, &min_free_entries);
+ debugfs_create_u32("nr_total_entries", 0444, dentry, &nr_total_entries);
+ debugfs_create_file("driver_filter", 0644, dentry, NULL, &filter_fops);
+ debugfs_create_file("dump", 0444, dentry, NULL, &dump_fops);
}
static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry)
@@ -985,12 +954,7 @@ static int dma_debug_init(void)
spin_lock_init(&dma_entry_hash[i].lock);
}
- if (dma_debug_fs_init() != 0) {
- pr_err("error creating debugfs entries - disabling\n");
- global_disable = true;
-
- return 0;
- }
+ dma_debug_fs_init();
nr_pages = DIV_ROUND_UP(nr_prealloc_entries, DMA_DEBUG_DYNAMIC_ENTRIES);
for (i = 0; i < nr_pages; ++i)