--- /dev/null
+/*
+ * net/tipc/dbg.c: TIPC print buffer routines for debuggign
+ *
+ * Copyright (c) 1996-2006, Ericsson AB
+ * Copyright (c) 2005, Wind River Systems
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. 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.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * 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 *TIPC_CONS = &cons_buf;
+
+static struct print_buf log_buf = { NULL, 0, NULL, NULL };
+struct print_buf *TIPC_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) TIPC_TEE() uses 'print_lock' to protect its print buffer(s).
+ * 4) Routines of the form log_XXX() uses 'print_lock' to protect TIPC_LOG.
+ */
+
+/**
+ * tipc_printbuf_init - initialize print buffer to empty
+ */
+
+void tipc_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 = NULL;
+ pb->buf[0] = 0;
+ pb->buf[sz-1] = ~0;
+}
+
+/**
+ * tipc_printbuf_reset - reinitialize print buffer to empty state
+ */
+
+void tipc_printbuf_reset(struct print_buf *pb)
+{
+ if (pb && pb->buf)
+ tipc_printbuf_init(pb, pb->buf, pb->size);
+}
+
+/**
+ * tipc_printbuf_empty - test if print buffer is in empty state
+ */
+
+int tipc_printbuf_empty(struct print_buf *pb)
+{
+ return (!pb || !pb->buf || (pb->crs == pb->buf));
+}
+
+/**
+ * tipc_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 tipc_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){
+ tipc_printbuf_init(&cb, cp_buf, pb->size);
+ tipc_printbuf_move(&cb, pb);
+ tipc_printbuf_move(pb, &cb);
+ kfree(cp_buf);
+ memcpy(pb->buf, err, strlen(err));
+ } else {
+ tipc_printbuf_reset(pb);
+ tipc_printf(pb, err);
+ }
+ }
+ return (pb->crs - pb->buf + 1);
+}
+
+/**
+ * tipc_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 tipc_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) {
+ tipc_printbuf_reset(pb_to);
+ return;
+ }
+
+ if (pb_to->size < pb_from->size) {
+ tipc_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;
+
+ tipc_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 == TIPC_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 = NULL;
+ pb = pb_next;
+ }
+ spin_unlock_bh(&print_lock);
+}
+
+/**
+ * TIPC_TEE - perform next output operation on both print buffers
+ */
+
+struct print_buf *TIPC_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(TIPC_CONS->buf, len, fmt);
+ printk(TIPC_CONS->buf);
+
+ for (; pb; pb = pb->next) {
+ if (pb == TIPC_CONS)
+ continue;
+ printk("\n---- Start of dump,%s log ----\n\n",
+ (pb == TIPC_LOG) ? "global" : "local");
+ printbuf_dump(pb);
+ tipc_printbuf_reset(pb);
+ printk("\n-------- End of dump --------\n");
+ }
+ spin_unlock_bh(&print_lock);
+}
+
+/**
+ * tipc_log_stop - free up TIPC log print buffer
+ */
+
+void tipc_log_stop(void)
+{
+ spin_lock_bh(&print_lock);
+ if (TIPC_LOG->buf) {
+ kfree(TIPC_LOG->buf);
+ TIPC_LOG->buf = NULL;
+ }
+ spin_unlock_bh(&print_lock);
+}
+
+/**
+ * tipc_log_reinit - set TIPC log print buffer to specified size
+ */
+
+void tipc_log_reinit(int log_size)
+{
+ tipc_log_stop();
+
+ if (log_size) {
+ if (log_size <= MAX_STRING)
+ log_size = MAX_STRING + 1;
+ spin_lock_bh(&print_lock);
+ tipc_printbuf_init(TIPC_LOG, kmalloc(log_size, GFP_ATOMIC), log_size);
+ spin_unlock_bh(&print_lock);
+ }
+}
+
+/**
+ * tipc_log_resize - reconfigure size of TIPC log buffer
+ */
+
+struct sk_buff *tipc_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 tipc_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 tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+ " (log size must be 0-32768)");
+ tipc_log_reinit(value);
+ return tipc_cfg_reply_none();
+}
+
+/**
+ * tipc_log_dump - capture TIPC log buffer contents in configuration message
+ */
+
+struct sk_buff *tipc_log_dump(void)
+{
+ struct sk_buff *reply;
+
+ spin_lock_bh(&print_lock);
+ if (!TIPC_LOG->buf)
+ reply = tipc_cfg_reply_ultra_string("log not activated\n");
+ else if (tipc_printbuf_empty(TIPC_LOG))
+ reply = tipc_cfg_reply_ultra_string("log is empty\n");
+ else {
+ struct tlv_desc *rep_tlv;
+ struct print_buf pb;
+ int str_len;
+
+ str_len = min(TIPC_LOG->size, 32768u);
+ reply = tipc_cfg_reply_alloc(TLV_SPACE(str_len));
+ if (reply) {
+ rep_tlv = (struct tlv_desc *)reply->data;
+ tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), str_len);
+ tipc_printbuf_move(&pb, TIPC_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;
+}
+
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