1 files changed, 392 insertions, 0 deletions

diff --git a/net/tipc/dbg.c b/net/tipc/dbg.c
new file mode 100644
index 0000000000000..efd6d652d0524
--- /dev/null
+++ b/net/tipc/dbg.c
@@ -0,0 +1,392 @@
+/*
+ * net/tipc/dbg.c: TIPC print buffer routines for debuggign
+ * 
+ * Copyright (c) 2003-2005, Ericsson Research Canada
+ * Copyright (c) 2005, Wind River Systems
+ * Copyright (c) 2005-2006, Ericsson AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this 
+ * list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright notice, 
+ * this list of conditions and the following disclaimer in the documentation 
+ * and/or other materials provided with the distribution.
+ * Neither the names of the copyright holders nor the names of its 
+ * contributors may be used to endorse or promote products derived from this 
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core.h"
+#include "config.h"
+#include "dbg.h"
+
+#define MAX_STRING 512
+
+static char print_string[MAX_STRING];
+static spinlock_t print_lock = SPIN_LOCK_UNLOCKED;
+
+static struct print_buf cons_buf = { NULL, 0, NULL, NULL };
+struct print_buf *CONS = &cons_buf;
+
+static struct print_buf log_buf = { NULL, 0, NULL, NULL };
+struct print_buf *LOG = &log_buf;
+
+
+#define FORMAT(PTR,LEN,FMT) \
+{\
+       va_list args;\
+       va_start(args, FMT);\
+       LEN = vsprintf(PTR, FMT, args);\
+       va_end(args);\
+       *(PTR + LEN) = '\0';\
+}
+
+/*
+ * Locking policy when using print buffers.
+ *
+ * 1) Routines of the form printbuf_XXX() rely on the caller to prevent
+ *    simultaneous use of the print buffer(s) being manipulated.
+ * 2) tipc_printf() uses 'print_lock' to prevent simultaneous use of
+ *    'print_string' and to protect its print buffer(s).
+ * 3) TEE() uses 'print_lock' to protect its print buffer(s).
+ * 4) Routines of the form log_XXX() uses 'print_lock' to protect LOG.
+ */
+
+/**
+ * printbuf_init - initialize print buffer to empty
+ */
+
+void printbuf_init(struct print_buf *pb, char *raw, u32 sz)
+{
+	if (!pb || !raw || (sz < (MAX_STRING + 1)))
+		return;
+
+	pb->crs = pb->buf = raw;
+	pb->size = sz;
+	pb->next = 0;
+	pb->buf[0] = 0;
+	pb->buf[sz-1] = ~0;
+}
+
+/**
+ * printbuf_reset - reinitialize print buffer to empty state
+ */
+
+void printbuf_reset(struct print_buf *pb)
+{
+	if (pb && pb->buf)
+		printbuf_init(pb, pb->buf, pb->size);
+}
+
+/**
+ * printbuf_empty - test if print buffer is in empty state
+ */
+
+int printbuf_empty(struct print_buf *pb)
+{
+	return (!pb || !pb->buf || (pb->crs == pb->buf));
+}
+
+/**
+ * printbuf_validate - check for print buffer overflow
+ * 
+ * Verifies that a print buffer has captured all data written to it. 
+ * If data has been lost, linearize buffer and prepend an error message
+ * 
+ * Returns length of print buffer data string (including trailing NULL)
+ */
+
+int printbuf_validate(struct print_buf *pb)
+{
+        char *err = "             *** PRINT BUFFER WRAPPED AROUND ***\n";
+        char *cp_buf;
+        struct print_buf cb;
+
+	if (!pb || !pb->buf)
+		return 0;
+
+	if (pb->buf[pb->size - 1] == '\0') {
+                cp_buf = kmalloc(pb->size, GFP_ATOMIC);
+                if (cp_buf != NULL){
+                        printbuf_init(&cb, cp_buf, pb->size);
+                        printbuf_move(&cb, pb);
+                        printbuf_move(pb, &cb);
+                        kfree(cp_buf);
+                        memcpy(pb->buf, err, strlen(err));
+                } else {
+                        printbuf_reset(pb);
+                        tipc_printf(pb, err);
+                }
+	}
+	return (pb->crs - pb->buf + 1);
+}
+
+/**
+ * printbuf_move - move print buffer contents to another print buffer
+ * 
+ * Current contents of destination print buffer (if any) are discarded.
+ * Source print buffer becomes empty if a successful move occurs.
+ */
+
+void printbuf_move(struct print_buf *pb_to, struct print_buf *pb_from)
+{
+	int len;
+
+	/* Handle the cases where contents can't be moved */
+
+	if (!pb_to || !pb_to->buf)
+		return;
+
+	if (!pb_from || !pb_from->buf) {
+		printbuf_reset(pb_to);
+		return;
+	}
+
+	if (pb_to->size < pb_from->size) {
+		printbuf_reset(pb_to);
+		tipc_printf(pb_to, "*** PRINT BUFFER OVERFLOW ***");
+		return;
+	}
+
+	/* Copy data from char after cursor to end (if used) */
+	len = pb_from->buf + pb_from->size - pb_from->crs - 2;
+	if ((pb_from->buf[pb_from->size-1] == 0) && (len > 0)) {
+		strcpy(pb_to->buf, pb_from->crs + 1);
+		pb_to->crs = pb_to->buf + len;
+	} else
+		pb_to->crs = pb_to->buf;
+
+	/* Copy data from start to cursor (always) */
+	len = pb_from->crs - pb_from->buf;
+	strcpy(pb_to->crs, pb_from->buf);
+	pb_to->crs += len;
+
+	printbuf_reset(pb_from);
+}
+
+/**
+ * tipc_printf - append formatted output to print buffer chain
+ */
+
+void tipc_printf(struct print_buf *pb, const char *fmt, ...)
+{
+	int chars_to_add;
+	int chars_left;
+	char save_char;
+	struct print_buf *pb_next;
+
+	spin_lock_bh(&print_lock);
+	FORMAT(print_string, chars_to_add, fmt);
+	if (chars_to_add >= MAX_STRING)
+		strcpy(print_string, "*** STRING TOO LONG ***");
+
+	while (pb) {
+		if (pb == CONS)
+			printk(print_string);
+		else if (pb->buf) {
+			chars_left = pb->buf + pb->size - pb->crs - 1;
+			if (chars_to_add <= chars_left) {
+				strcpy(pb->crs, print_string);
+				pb->crs += chars_to_add;
+			} else {
+				strcpy(pb->buf, print_string + chars_left);
+                                save_char = print_string[chars_left];
+                                print_string[chars_left] = 0;
+                                strcpy(pb->crs, print_string);
+                                print_string[chars_left] = save_char;
+                                pb->crs = pb->buf + chars_to_add - chars_left;
+                        }
+                }
+		pb_next = pb->next;
+		pb->next = 0;
+		pb = pb_next;
+	}
+	spin_unlock_bh(&print_lock);
+}
+
+/**
+ * TEE - perform next output operation on both print buffers  
+ */
+
+struct print_buf *TEE(struct print_buf *b0, struct print_buf *b1)
+{
+	struct print_buf *pb = b0;
+
+	if (!b0 || (b0 == b1))
+		return b1;
+	if (!b1)
+		return b0;
+
+	spin_lock_bh(&print_lock);
+	while (pb->next) {
+		if ((pb->next == b1) || (pb->next == b0))
+			pb->next = pb->next->next;
+		else
+			pb = pb->next;
+	}
+	pb->next = b1;
+	spin_unlock_bh(&print_lock);
+	return b0;
+}
+
+/**
+ * print_to_console - write string of bytes to console in multiple chunks
+ */
+
+static void print_to_console(char *crs, int len)
+{
+	int rest = len;
+
+	while (rest > 0) {
+		int sz = rest < MAX_STRING ? rest : MAX_STRING;
+		char c = crs[sz];
+
+		crs[sz] = 0;
+		printk((const char *)crs);
+		crs[sz] = c;
+		rest -= sz;
+		crs += sz;
+	}
+}
+
+/**
+ * printbuf_dump - write print buffer contents to console
+ */
+
+static void printbuf_dump(struct print_buf *pb)
+{
+	int len;
+
+	/* Dump print buffer from char after cursor to end (if used) */
+	len = pb->buf + pb->size - pb->crs - 2;
+	if ((pb->buf[pb->size - 1] == 0) && (len > 0))
+		print_to_console(pb->crs + 1, len);
+
+	/* Dump print buffer from start to cursor (always) */
+	len = pb->crs - pb->buf;
+	print_to_console(pb->buf, len);
+}
+
+/**
+ * tipc_dump - dump non-console print buffer(s) to console
+ */
+
+void tipc_dump(struct print_buf *pb, const char *fmt, ...)
+{
+	int len;
+
+	spin_lock_bh(&print_lock);
+	FORMAT(CONS->buf, len, fmt);
+	printk(CONS->buf);
+
+	for (; pb; pb = pb->next) {
+		if (pb == CONS)
+			continue;
+		printk("\n---- Start of dump,%s log ----\n\n", 
+		       (pb == LOG) ? "global" : "local");
+		printbuf_dump(pb);
+		printbuf_reset(pb);
+		printk("\n-------- End of dump --------\n");
+	}
+	spin_unlock_bh(&print_lock);
+}
+
+/**
+ * log_stop - free up TIPC log print buffer 
+ */
+
+void log_stop(void)
+{
+	spin_lock_bh(&print_lock);
+	if (LOG->buf) {
+		kfree(LOG->buf);
+		LOG->buf = NULL;
+	}
+	spin_unlock_bh(&print_lock);
+}
+
+/**
+ * log_reinit - set TIPC log print buffer to specified size
+ */
+
+void log_reinit(int log_size)
+{
+	log_stop();
+
+	if (log_size) {
+		if (log_size <= MAX_STRING)
+			log_size = MAX_STRING + 1;
+		spin_lock_bh(&print_lock);
+		printbuf_init(LOG, kmalloc(log_size, GFP_ATOMIC), log_size);
+		spin_unlock_bh(&print_lock);
+	}
+}
+
+/**
+ * log_resize - reconfigure size of TIPC log buffer
+ */
+
+struct sk_buff *log_resize(const void *req_tlv_area, int req_tlv_space)
+{
+	u32 value;
+
+	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
+		return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+
+	value = *(u32 *)TLV_DATA(req_tlv_area);
+	value = ntohl(value);
+	if (value != delimit(value, 0, 32768))
+		return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+					      " (log size must be 0-32768)");
+	log_reinit(value);
+	return cfg_reply_none();
+}
+
+/**
+ * log_dump - capture TIPC log buffer contents in configuration message
+ */
+
+struct sk_buff *log_dump(void)
+{
+	struct sk_buff *reply;
+
+	spin_lock_bh(&print_lock);
+	if (!LOG->buf)
+		reply = cfg_reply_ultra_string("log not activated\n");
+	else if (printbuf_empty(LOG))
+		reply = cfg_reply_ultra_string("log is empty\n");
+	else {
+		struct tlv_desc *rep_tlv;
+		struct print_buf pb;
+		int str_len;
+
+		str_len = min(LOG->size, 32768u);
+		reply = cfg_reply_alloc(TLV_SPACE(str_len));
+		if (reply) {
+			rep_tlv = (struct tlv_desc *)reply->data;
+			printbuf_init(&pb, TLV_DATA(rep_tlv), str_len);
+			printbuf_move(&pb, LOG);
+			str_len = strlen(TLV_DATA(rep_tlv)) + 1;
+			skb_put(reply, TLV_SPACE(str_len));
+			TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
+		}
+	}
+	spin_unlock_bh(&print_lock);
+	return reply;
+}
+