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dma-debug: add cacheline to user/kernel space dump messages

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Having the cacheline also printed on the debug_dma_dump_mappings() and
dump_show() is useful for debugging. Furthermore, this also standardizes
the messages shown on both dump functions.

Signed-off-by: Desnes Nunes <desnesn@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Desnes Nunes 2023-03-16 11:09:11 -03:00 • committed by Christoph Hellwig
parent 479623fd0c
commit bd89d69a52
1 changed files with 64 additions and 58 deletions
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122
kernel/dma/debug.c
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@ -396,37 +396,6 @@ static unsigned long long phys_addr(struct dma_debug_entry *entry)
return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset; return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset;
} }
/*
* Dump mapping entries for debugging purposes
*/
void debug_dma_dump_mappings(struct device *dev)
{
int idx;
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) {
if (!dev || dev == entry->dev) {
dev_info(entry->dev,
"%s idx %d P=%Lx N=%lx D=%Lx L=%Lx %s %s\n",
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);
cond_resched();
}
}
/* /*
* For each mapping (initial cacheline in the case of * For each mapping (initial cacheline in the case of
* dma_alloc_coherent/dma_map_page, initial cacheline in each page of a * dma_alloc_coherent/dma_map_page, initial cacheline in each page of a
@ -547,6 +516,70 @@ static void active_cacheline_remove(struct dma_debug_entry *entry)
spin_unlock_irqrestore(&radix_lock, flags); spin_unlock_irqrestore(&radix_lock, flags);
} }
/*
* Dump mappings entries on kernel space for debugging purposes
*/
void debug_dma_dump_mappings(struct device *dev)
{
int idx;
phys_addr_t cln;
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) {
if (!dev || dev == entry->dev) {
cln = to_cacheline_number(entry);
dev_info(entry->dev,
"%s idx %d P=%llx N=%lx D=%llx L=%llx cln=%llx %s %s\n",
type2name[entry->type], idx,
phys_addr(entry), entry->pfn,
entry->dev_addr, entry->size,
cln, dir2name[entry->direction],
maperr2str[entry->map_err_type]);
}
}
spin_unlock_irqrestore(&bucket->lock, flags);
cond_resched();
}
}
/*
* Dump mappings entries on user space via debugfs
*/
static int dump_show(struct seq_file *seq, void *v)
{
int idx;
phys_addr_t cln;
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) {
cln = to_cacheline_number(entry);
seq_printf(seq,
"%s %s %s idx %d P=%llx N=%lx D=%llx L=%llx cln=%llx %s %s\n",
dev_driver_string(entry->dev),
dev_name(entry->dev),
type2name[entry->type], idx,
phys_addr(entry), entry->pfn,
entry->dev_addr, entry->size,
cln, dir2name[entry->direction],
maperr2str[entry->map_err_type]);
}
spin_unlock_irqrestore(&bucket->lock, flags);
}
return 0;
}
DEFINE_SHOW_ATTRIBUTE(dump);
/* /*
* Wrapper function for adding an entry to the hash. * Wrapper function for adding an entry to the hash.
* This function takes care of locking itself. * This function takes care of locking itself.
@ -765,33 +798,6 @@ static const struct file_operations filter_fops = {
.llseek = default_llseek, .llseek = default_llseek,
}; };
static int dump_show(struct seq_file *seq, void *v)
{
int idx;
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);
static int __init dma_debug_fs_init(void) static int __init dma_debug_fs_init(void)
{ {
struct dentry *dentry = debugfs_create_dir("dma-api", NULL); struct dentry *dentry = debugfs_create_dir("dma-api", NULL);