linux-kernel - [PATCH 2/3] dma-debug: add cacheline to user/kernel space dump messages

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Date:   Wed, 15 Mar 2023 16:21:29 -0300
From:   Desnes Nunes <desnesn@...hat.com>
To:     iommu@...ts.linux.dev, linux-scsi@...r.kernel.org,
        storagedev@...rochip.com, linux-kernel@...r.kernel.org
Cc:     hch@....de, martin.petersen@...cle.com, don.brace@...rochip.com,
        m.szyprowski@...sung.com, robin.murphy@....com, jejb@...ux.ibm.com,
        jsnitsel@...hat.com, Desnes Nunes <desnesn@...hat.com>
Subject: [PATCH 2/3] dma-debug: add cacheline to user/kernel space dump messages

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@...hat.com>
---
 kernel/dma/debug.c | 122 ++++++++++++++++++++++++---------------------
 1 file changed, 64 insertions(+), 58 deletions(-)

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index e0ad8db1ec25..19cc59829ffd 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -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;
 }
 
-/*
- * 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
  * 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);
 }
 
+/*
+ * 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.
  * This function takes care of locking itself.
@@ -765,33 +798,6 @@ static const struct file_operations filter_fops = {
 	.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)
 {
 	struct dentry *dentry = debugfs_create_dir("dma-api", NULL);
-- 
2.39.1