#include <linux/time.h>
#include <linux/refcount.h>
#include <linux/fs.h>
+#include <linux/init.h>
#define DEBUG_MAX_LEVEL 6 /* debug levels range from 0 to 6 */
#define DEBUG_OFF_LEVEL -1 /* level where debug is switched off */
int debug_unregister_view(debug_info_t *id, struct debug_view *view);
+#ifndef MODULE
+
+/*
+ * Note: Initial page and area numbers must be fixed to allow static
+ * initialization. This enables very early tracing. Changes to these values
+ * must be reflected in __DEFINE_STATIC_AREA.
+ */
+#define EARLY_PAGES 8
+#define EARLY_AREAS 1
+
+#define VNAME(var, suffix) __##var##_##suffix
+
+/*
+ * Define static areas for early trace data. During boot debug_register_static()
+ * will replace these with dynamically allocated areas to allow custom page and
+ * area sizes, and dynamic resizing.
+ */
+#define __DEFINE_STATIC_AREA(var) \
+static char VNAME(var, data)[EARLY_PAGES][PAGE_SIZE] __initdata; \
+static debug_entry_t *VNAME(var, pages)[EARLY_PAGES] __initdata = { \
+ (debug_entry_t *)VNAME(var, data)[0], \
+ (debug_entry_t *)VNAME(var, data)[1], \
+ (debug_entry_t *)VNAME(var, data)[2], \
+ (debug_entry_t *)VNAME(var, data)[3], \
+ (debug_entry_t *)VNAME(var, data)[4], \
+ (debug_entry_t *)VNAME(var, data)[5], \
+ (debug_entry_t *)VNAME(var, data)[6], \
+ (debug_entry_t *)VNAME(var, data)[7], \
+}; \
+static debug_entry_t **VNAME(var, areas)[EARLY_AREAS] __initdata = { \
+ (debug_entry_t **)VNAME(var, pages), \
+}; \
+static int VNAME(var, active_pages)[EARLY_AREAS] __initdata; \
+static int VNAME(var, active_entries)[EARLY_AREAS] __initdata
+
+#define __DEBUG_INFO_INIT(var, _name, _buf_size) { \
+ .next = NULL, \
+ .prev = NULL, \
+ .ref_count = REFCOUNT_INIT(1), \
+ .lock = __SPIN_LOCK_UNLOCKED(var.lock), \
+ .level = DEBUG_DEFAULT_LEVEL, \
+ .nr_areas = EARLY_AREAS, \
+ .pages_per_area = EARLY_PAGES, \
+ .buf_size = (_buf_size), \
+ .entry_size = sizeof(debug_entry_t) + (_buf_size), \
+ .areas = VNAME(var, areas), \
+ .active_area = 0, \
+ .active_pages = VNAME(var, active_pages), \
+ .active_entries = VNAME(var, active_entries), \
+ .debugfs_root_entry = NULL, \
+ .debugfs_entries = { NULL }, \
+ .views = { NULL }, \
+ .name = (_name), \
+ .mode = 0600, \
+}
+
+#define __REGISTER_STATIC_DEBUG_INFO(var, name, pages, areas, view) \
+static int __init VNAME(var, reg)(void) \
+{ \
+ debug_register_static(&var, (pages), (areas)); \
+ debug_register_view(&var, (view)); \
+ return 0; \
+} \
+arch_initcall(VNAME(var, reg))
+
+/**
+ * DEFINE_STATIC_DEBUG_INFO - Define static debug_info_t
+ *
+ * @var: Name of debug_info_t variable
+ * @name: Name of debug log (e.g. used for debugfs entry)
+ * @pages_per_area: Number of pages per area
+ * @nr_areas: Number of debug areas
+ * @buf_size: Size of data area in each debug entry
+ * @view: Pointer to debug view struct
+ *
+ * Define a static debug_info_t for early tracing. The associated debugfs log
+ * is automatically registered with the specified debug view.
+ *
+ * Important: Users of this macro must not call any of the
+ * debug_register/_unregister() functions for this debug_info_t!
+ *
+ * Note: Tracing will start with a fixed number of initial pages and areas.
+ * The debug area will be changed to use the specified numbers during
+ * arch_initcall.
+ */
+#define DEFINE_STATIC_DEBUG_INFO(var, name, pages, nr_areas, buf_size, view) \
+__DEFINE_STATIC_AREA(var); \
+static debug_info_t __refdata var = \
+ __DEBUG_INFO_INIT(var, (name), (buf_size)); \
+__REGISTER_STATIC_DEBUG_INFO(var, name, pages, nr_areas, view)
+
+void debug_register_static(debug_info_t *id, int pages_per_area, int nr_areas);
+
+#endif /* MODULE */
+
#endif /* DEBUG_H */
}
EXPORT_SYMBOL(debug_register);
+/**
+ * debug_register_static() - registers a static debug area
+ *
+ * @id: Handle for static debug area
+ * @pages_per_area: Number of pages per area
+ * @nr_areas: Number of debug areas
+ *
+ * Register debug_info_t defined using DEFINE_STATIC_DEBUG_INFO.
+ *
+ * Note: This function is called automatically via an initcall generated by
+ * DEFINE_STATIC_DEBUG_INFO.
+ */
+void debug_register_static(debug_info_t *id, int pages_per_area, int nr_areas)
+{
+ unsigned long flags;
+ debug_info_t *copy;
+
+ if (!initialized) {
+ pr_err("Tried to register debug feature %s too early\n",
+ id->name);
+ return;
+ }
+
+ copy = debug_info_alloc("", pages_per_area, nr_areas, id->buf_size,
+ id->level, ALL_AREAS);
+ if (!copy) {
+ pr_err("Registering debug feature %s failed\n", id->name);
+
+ /* Clear pointers to prevent tracing into released initdata. */
+ spin_lock_irqsave(&id->lock, flags);
+ id->areas = NULL;
+ id->active_pages = NULL;
+ id->active_entries = NULL;
+ spin_unlock_irqrestore(&id->lock, flags);
+
+ return;
+ }
+
+ /* Replace static trace area with dynamic copy. */
+ spin_lock_irqsave(&id->lock, flags);
+ debug_events_append(copy, id);
+ debug_areas_swap(id, copy);
+ spin_unlock_irqrestore(&id->lock, flags);
+
+ /* Clear pointers to initdata and discard copy. */
+ copy->areas = NULL;
+ copy->active_pages = NULL;
+ copy->active_entries = NULL;
+ debug_info_free(copy);
+
+ mutex_lock(&debug_mutex);
+ _debug_register(id);
+ mutex_unlock(&debug_mutex);
+}
+
/* Remove debugfs entries and remove from internal list. */
static void _debug_unregister(debug_info_t *id)
{
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