staging: ozwpan: Added debug support

Added tracing facilities and also memory allocation and URB tracking.
This is for debugging purposes and is all optional and can be switched
out at compile time.
Signed-off-by: Chris Kelly <ckelly@ozmodevices.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ozwpan/ozalloc.c

+/* -----------------------------------------------------------------------------
+ * Copyright (c) 2011 Ozmo Inc
+ * Released under the GNU General Public License Version 2 (GPLv2).
+ * This file contains debug allocation and free functions. These are turned on
+ * by the configuration switch WANT_DEBUG_KMALLOC. This flags should be turned
+ * off in the release version but facilitate memory leak and corruption during
+ * development.
+ * -----------------------------------------------------------------------------
+ */
+#include <linux/module.h>
+#include "ozconfig.h"
+#include "ozalloc.h"
+#include "oztrace.h"
+#ifdef WANT_DEBUG_KMALLOC
+/*------------------------------------------------------------------------------
+ */
+#define MAGIC_1	0x12848796
+#define MAGIC_2	0x87465920
+#define MAGIC_3	0x80288264
+/*------------------------------------------------------------------------------
+ */
+struct oz_alloc_hdr {
+	int size;
+	int line;
+	unsigned magic;
+	struct list_head link;
+};
+/*------------------------------------------------------------------------------
+ */
+static unsigned long g_total_alloc_size;
+static int g_alloc_count;
+static DEFINE_SPINLOCK(g_alloc_lock);
+static LIST_HEAD(g_alloc_list);
+/*------------------------------------------------------------------------------
+ * Context: any
+ */
+void *oz_alloc_debug(size_t size, gfp_t flags, int line)
+{
+	struct oz_alloc_hdr *hdr = (struct oz_alloc_hdr *)
+		kmalloc(size + sizeof(struct oz_alloc_hdr) +
+			sizeof(unsigned), flags);
+	if (hdr) {
+		unsigned long irq_state;
+		hdr->size = size;
+		hdr->line = line;
+		hdr->magic = MAGIC_1;
+		*(unsigned *)(((u8 *)(hdr + 1)) + size) = MAGIC_2;
+		spin_lock_irqsave(&g_alloc_lock, irq_state);
+		g_total_alloc_size += size;
+		g_alloc_count++;
+		list_add_tail(&hdr->link, &g_alloc_list);
+		spin_unlock_irqrestore(&g_alloc_lock, irq_state);
+		return hdr + 1;
+	}
+	return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: any
+ */
+void oz_free_debug(void *p)
+{
+	if (p) {
+		struct oz_alloc_hdr *hdr = (struct oz_alloc_hdr *)
+			(((unsigned char *)p) - sizeof(struct oz_alloc_hdr));
+		if (hdr->magic == MAGIC_1) {
+			unsigned long irq_state;
+			if (*(unsigned *)(((u8 *)(hdr + 1)) + hdr->size)
+				!= MAGIC_2) {
+				oz_trace("oz_free_debug: Corrupted beyond"
+					" %p size %d\n", hdr+1, hdr->size);
+				return;
+			}
+			spin_lock_irqsave(&g_alloc_lock, irq_state);
+			g_total_alloc_size -= hdr->size;
+			g_alloc_count--;
+			list_del(&hdr->link);
+			spin_unlock_irqrestore(&g_alloc_lock, irq_state);
+			hdr->magic = MAGIC_3;
+			kfree(hdr);
+		} else {
+			oz_trace("oz_free_debug: Invalid magic number %u\n",
+				hdr->magic);
+		}
+	}
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+void oz_trace_leaks(void)
+{
+#ifdef WANT_TRACE
+	struct list_head *e;
+	oz_trace("Total alloc size:%ld  Alloc count:%d\n",
+			g_total_alloc_size, g_alloc_count);
+	if (g_alloc_count)
+		oz_trace("Trace of leaks.\n");
+	else
+		oz_trace("No memory leaks.\n");
+	list_for_each(e, &g_alloc_list) {
+		struct oz_alloc_hdr *hdr =
+			container_of(e, struct oz_alloc_hdr, link);
+		oz_trace("LEAK size %d line %d\n", hdr->size, hdr->line);
+	}
+#endif /* #ifdef WANT_TRACE */
+}
+#endif /* #ifdef WANT_DEBUG_KMALLOC */
+

drivers/staging/ozwpan/ozalloc.h

+/* -----------------------------------------------------------------------------
+ * Copyright (c) 2011 Ozmo Inc
+ * Released under the GNU General Public License Version 2 (GPLv2).
+ * -----------------------------------------------------------------------------
+ */
+#ifndef _OZALLOC_H
+#define _OZALLOC_H
+
+#include <linux/slab.h>
+
+#ifdef WANT_DEBUG_KMALLOC
+
+void *oz_alloc_debug(size_t size, gfp_t flags, int line);
+void oz_free_debug(void *p);
+void oz_trace_leaks(void);
+#define oz_alloc(__s, __f)	oz_alloc_debug(__s, __f, __LINE__)
+#define oz_free			oz_free_debug
+
+#else
+
+
+#define oz_alloc	kmalloc
+#define oz_free		kfree
+#define oz_trace_leaks()
+
+#endif /* #ifdef WANT_DEBUG_KMALLOC */
+
+#endif /* _OZALLOC_H */

drivers/staging/ozwpan/oztrace.c

+/* -----------------------------------------------------------------------------
+ * Copyright (c) 2011 Ozmo Inc
+ * Released under the GNU General Public License Version 2 (GPLv2).
+ * -----------------------------------------------------------------------------
+ */
+#include "ozconfig.h"
+#include "oztrace.h"
+
+#ifdef WANT_VERBOSE_TRACE
+unsigned long trace_flags =
+	0
+#ifdef WANT_TRACE_STREAM
+	| OZ_TRACE_STREAM
+#endif /* WANT_TRACE_STREAM */
+#ifdef WANT_TRACE_URB
+	| OZ_TRACE_URB
+#endif /* WANT_TRACE_URB */
+
+#ifdef WANT_TRACE_CTRL_DETAIL
+	| OZ_TRACE_CTRL_DETAIL
+#endif /* WANT_TRACE_CTRL_DETAIL */
+
+#ifdef WANT_TRACE_HUB
+	| OZ_TRACE_HUB
+#endif /* WANT_TRACE_HUB */
+
+#ifdef WANT_TRACE_RX_FRAMES
+	| OZ_TRACE_RX_FRAMES
+#endif /* WANT_TRACE_RX_FRAMES */
+
+#ifdef WANT_TRACE_TX_FRAMES
+	| OZ_TRACE_TX_FRAMES
+#endif /* WANT_TRACE_TX_FRAMES */
+	;
+#endif /* WANT_VERBOSE_TRACE */
+

drivers/staging/ozwpan/oztrace.h

+/* -----------------------------------------------------------------------------
+ * Copyright (c) 2011 Ozmo Inc
+ * Released under the GNU General Public License Version 2 (GPLv2).
+ * -----------------------------------------------------------------------------
+ */
+#ifndef _OZTRACE_H_
+#define _OZTRACE_H_
+#include "ozconfig.h"
+
+#define TRACE_PREFIX	KERN_ALERT "OZWPAN: "
+
+#ifdef WANT_TRACE
+#define oz_trace(...) printk(TRACE_PREFIX __VA_ARGS__)
+#ifdef WANT_VERBOSE_TRACE
+extern unsigned long trace_flags;
+#define oz_trace2(_flag, ...) \
+	do { if (trace_flags & _flag) printk(TRACE_PREFIX __VA_ARGS__); \
+	} while (0)
+#else
+#define oz_trace2(...)
+#endif /* #ifdef WANT_VERBOSE_TRACE */
+#else
+#define oz_trace(...)
+#define oz_trace2(...)
+#endif /* #ifdef WANT_TRACE */
+
+#define OZ_TRACE_STREAM		0x1
+#define OZ_TRACE_URB		0x2
+#define OZ_TRACE_CTRL_DETAIL	0x4
+#define OZ_TRACE_HUB		0x8
+#define OZ_TRACE_RX_FRAMES	0x10
+#define OZ_TRACE_TX_FRAMES	0x20
+
+#endif /* Sentry */
+

drivers/staging/ozwpan/ozurbparanoia.c

+/* -----------------------------------------------------------------------------
+ * Copyright (c) 2011 Ozmo Inc
+ * Released under the GNU General Public License Version 2 (GPLv2).
+ * -----------------------------------------------------------------------------
+ */
+#include <linux/usb.h>
+#include "ozconfig.h"
+#ifdef WANT_URB_PARANOIA
+#include "ozurbparanoia.h"
+#include "oztrace.h"
+/*-----------------------------------------------------------------------------
+ */
+#define OZ_MAX_URBS	1000
+struct urb *g_urb_memory[OZ_MAX_URBS];
+int g_nb_urbs;
+DEFINE_SPINLOCK(g_urb_mem_lock);
+/*-----------------------------------------------------------------------------
+ */
+void oz_remember_urb(struct urb *urb)
+{
+	unsigned long irq_state;
+	spin_lock_irqsave(&g_urb_mem_lock, irq_state);
+	if (g_nb_urbs < OZ_MAX_URBS) {
+		g_urb_memory[g_nb_urbs++] = urb;
+		oz_trace("%lu: urb up = %d %p\n", jiffies, g_nb_urbs, urb);
+	} else {
+		oz_trace("ERROR urb buffer full\n");
+	}
+	spin_unlock_irqrestore(&g_urb_mem_lock, irq_state);
+}
+/*------------------------------------------------------------------------------
+ */
+int oz_forget_urb(struct urb *urb)
+{
+	unsigned long irq_state;
+	int i;
+	int rc = -1;
+	spin_lock_irqsave(&g_urb_mem_lock, irq_state);
+	for (i = 0; i < g_nb_urbs; i++) {
+		if (g_urb_memory[i] == urb) {
+			rc = 0;
+			if (--g_nb_urbs > i)
+				memcpy(&g_urb_memory[i], &g_urb_memory[i+1],
+					(g_nb_urbs - i) * sizeof(struct urb *));
+			oz_trace("%lu: urb down = %d %p\n",
+				jiffies, g_nb_urbs, urb);
+		}
+	}
+	spin_unlock_irqrestore(&g_urb_mem_lock, irq_state);
+	return rc;
+}
+#endif /* #ifdef WANT_URB_PARANOIA */
+

drivers/staging/ozwpan/ozurbparanoia.h

+#ifndef _OZURBPARANOIA_H
+#define _OZURBPARANOIA_H
+/* -----------------------------------------------------------------------------
+ * Released under the GNU General Public License Version 2 (GPLv2).
+ * Copyright (c) 2011 Ozmo Inc
+ * -----------------------------------------------------------------------------
+ */
+
+#ifdef WANT_URB_PARANOIA
+void oz_remember_urb(struct urb *urb);
+int oz_forget_urb(struct urb *urb);
+#else
+#define oz_remember_urb(__x)
+#define oz_forget_urb(__x)	0
+#endif /* WANT_URB_PARANOIA */
+
+
+#endif /* _OZURBPARANOIA_H */
+