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-rw-r--r--net/tipc/dbg.c395
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diff --git a/net/tipc/dbg.c b/net/tipc/dbg.c
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-/*
- * 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 = 0;
- 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 = 0;
- 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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