s390/debug: keep debug data on resize

Any previously recorded s390dbf debug data is reset when a debug area
is resized using the 'pages' sysfs attribute. This can make
live-debugging unnecessarily complex.

Fix this by copying existing debug data to the newly allocated debug
area when resizing.

Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c
index 09b6c64..0dbe48f 100644 (file)
--- a/arch/s390/kernel/debug.c
+++ b/arch/s390/kernel/debug.c
@@ -24,6 +24,7 @@
 #include <linux/export.h>
 #include <linux/init.h>
 #include <linux/fs.h>
+#include <linux/minmax.h>
 #include <linux/debugfs.h>
 
 #include <asm/debug.h>
@@ -92,6 +93,8 @@ static int debug_hex_ascii_format_fn(debug_info_t *id, struct debug_view *view,
                                     char *out_buf, const char *in_buf);
 static int debug_sprintf_format_fn(debug_info_t *id, struct debug_view *view,
                                   char *out_buf, debug_sprintf_entry_t *curr_event);
+static void debug_areas_swap(debug_info_t *a, debug_info_t *b);
+static void debug_events_append(debug_info_t *dest, debug_info_t *src);
 
 /* globals */
 
@@ -726,35 +729,28 @@ EXPORT_SYMBOL(debug_unregister);
  */
 static int debug_set_size(debug_info_t *id, int nr_areas, int pages_per_area)
 {
-       debug_entry_t ***new_areas;
+       debug_info_t *new_id;
        unsigned long flags;
-       int rc = 0;
 
        if (!id || (nr_areas <= 0) || (pages_per_area < 0))
                return -EINVAL;
-       if (pages_per_area > 0) {
-               new_areas = debug_areas_alloc(pages_per_area, nr_areas);
-               if (!new_areas) {
-                       pr_info("Allocating memory for %i pages failed\n",
-                               pages_per_area);
-                       rc = -ENOMEM;
-                       goto out;
-               }
-       } else {
-               new_areas = NULL;
+
+       new_id = debug_info_alloc("", pages_per_area, nr_areas, id->buf_size,
+                                 id->level, ALL_AREAS);
+       if (!new_id) {
+               pr_info("Allocating memory for %i pages failed\n",
+                       pages_per_area);
+               return -ENOMEM;
        }
+
        spin_lock_irqsave(&id->lock, flags);
-       debug_areas_free(id);
-       id->areas = new_areas;
-       id->nr_areas = nr_areas;
-       id->pages_per_area = pages_per_area;
-       id->active_area = 0;
-       memset(id->active_entries, 0, sizeof(int)*id->nr_areas);
-       memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
+       debug_events_append(new_id, id);
+       debug_areas_swap(new_id, id);
+       debug_info_free(new_id);
        spin_unlock_irqrestore(&id->lock, flags);
        pr_info("%s: set new size (%i pages)\n", id->name, pages_per_area);
-out:
-       return rc;
+
+       return 0;
 }
 
 /**
@@ -821,6 +817,42 @@ static inline debug_entry_t *get_active_entry(debug_info_t *id)
                                  id->active_entries[id->active_area]);
 }
 
+/* Swap debug areas of a and b. */
+static void debug_areas_swap(debug_info_t *a, debug_info_t *b)
+{
+       swap(a->nr_areas, b->nr_areas);
+       swap(a->pages_per_area, b->pages_per_area);
+       swap(a->areas, b->areas);
+       swap(a->active_area, b->active_area);
+       swap(a->active_pages, b->active_pages);
+       swap(a->active_entries, b->active_entries);
+}
+
+/* Append all debug events in active area from source to destination log. */
+static void debug_events_append(debug_info_t *dest, debug_info_t *src)
+{
+       debug_entry_t *from, *to, *last;
+
+       if (!src->areas || !dest->areas)
+               return;
+
+       /* Loop over all entries in src, starting with oldest. */
+       from = get_active_entry(src);
+       last = from;
+       do {
+               if (from->clock != 0LL) {
+                       to = get_active_entry(dest);
+                       memset(to, 0, dest->entry_size);
+                       memcpy(to, from, min(src->entry_size,
+                                            dest->entry_size));
+                       proceed_active_entry(dest);
+               }
+
+               proceed_active_entry(src);
+               from = get_active_entry(src);
+       } while (from != last);
+}
+
 /*
  * debug_finish_entry:
  * - set timestamp, caller address, cpu number etc.