[TIPC]: Debug print buffer enhancements and fixes
This change modifies TIPC's print buffer code as follows: 1) Now supports small print buffers (min. size reduced from 512 bytes to 64) 2) Now uses TIPC_NULL print buffer structure to indicate null device instead of NULL pointer (this simplified error handling) 3) Fixed misuse of console buffer structure by tipc_dump() 4) Added and corrected comments in various places Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: Per Liden <per.liden@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens
David S. Miller
parent
065fd1772a
commit
29ede244cc
|
|
@ -65,7 +65,7 @@
|
|||
#define assert(i) BUG_ON(!(i))
|
||||
|
||||
struct tipc_msg;
|
||||
extern struct print_buf *TIPC_CONS, *TIPC_LOG;
|
||||
extern struct print_buf *TIPC_NULL, *TIPC_CONS, *TIPC_LOG;
|
||||
extern struct print_buf *TIPC_TEE(struct print_buf *, struct print_buf *);
|
||||
void tipc_msg_print(struct print_buf*,struct tipc_msg *,const char*);
|
||||
void tipc_printf(struct print_buf *, const char *fmt, ...);
|
||||
|
|
@ -94,11 +94,11 @@ void tipc_dump(struct print_buf*,const char *fmt, ...);
|
|||
* here, or on a per .c file basis, by redefining these symbols. The following
|
||||
* print buffer options are available:
|
||||
*
|
||||
* NULL : Output to null print buffer (i.e. print nowhere)
|
||||
* TIPC_CONS : Output to system console
|
||||
* TIPC_LOG : Output to TIPC log buffer
|
||||
* &buf : Output to user-defined buffer (struct print_buf *)
|
||||
* TIPC_TEE(&buf_a,&buf_b) : Output to two print buffers (eg. TIPC_TEE(TIPC_CONS,TIPC_LOG) )
|
||||
* TIPC_NULL : null buffer (i.e. print nowhere)
|
||||
* TIPC_CONS : system console
|
||||
* TIPC_LOG : TIPC log buffer
|
||||
* &buf : user-defined buffer (struct print_buf *)
|
||||
* TIPC_TEE(&buf_a,&buf_b) : list of buffers (eg. TIPC_TEE(TIPC_CONS,TIPC_LOG))
|
||||
*/
|
||||
|
||||
#ifndef TIPC_OUTPUT
|
||||
|
|
@ -106,7 +106,7 @@ void tipc_dump(struct print_buf*,const char *fmt, ...);
|
|||
#endif
|
||||
|
||||
#ifndef DBG_OUTPUT
|
||||
#define DBG_OUTPUT NULL
|
||||
#define DBG_OUTPUT TIPC_NULL
|
||||
#endif
|
||||
|
||||
#else
|
||||
|
|
@ -136,7 +136,7 @@ void tipc_dump(struct print_buf*,const char *fmt, ...);
|
|||
#define TIPC_OUTPUT TIPC_CONS
|
||||
|
||||
#undef DBG_OUTPUT
|
||||
#define DBG_OUTPUT NULL
|
||||
#define DBG_OUTPUT TIPC_NULL
|
||||
|
||||
#endif
|
||||
|
||||
|
|
|
|||
136
net/tipc/dbg.c
136
net/tipc/dbg.c
|
|
@ -1,8 +1,8 @@
|
|||
/*
|
||||
* net/tipc/dbg.c: TIPC print buffer routines for debuggign
|
||||
* net/tipc/dbg.c: TIPC print buffer routines for debugging
|
||||
*
|
||||
* Copyright (c) 1996-2006, Ericsson AB
|
||||
* Copyright (c) 2005, Wind River Systems
|
||||
* Copyright (c) 2005-2006, Wind River Systems
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
|
|
@ -38,11 +38,12 @@
|
|||
#include "config.h"
|
||||
#include "dbg.h"
|
||||
|
||||
#define MAX_STRING 512
|
||||
|
||||
static char print_string[MAX_STRING];
|
||||
static char print_string[TIPC_PB_MAX_STR];
|
||||
static DEFINE_SPINLOCK(print_lock);
|
||||
|
||||
static struct print_buf null_buf = { NULL, 0, NULL, NULL };
|
||||
struct print_buf *TIPC_NULL = &null_buf;
|
||||
|
||||
static struct print_buf cons_buf = { NULL, 0, NULL, NULL };
|
||||
struct print_buf *TIPC_CONS = &cons_buf;
|
||||
|
||||
|
|
@ -62,68 +63,83 @@ struct print_buf *TIPC_LOG = &log_buf;
|
|||
/*
|
||||
* 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.
|
||||
* The following routines use 'print_lock' for protection:
|
||||
* 1) tipc_printf() - to protect its print buffer(s) and 'print_string'
|
||||
* 2) TIPC_TEE() - to protect its print buffer(s)
|
||||
* 3) tipc_dump() - to protect its print buffer(s) and 'print_string'
|
||||
* 4) tipc_log_XXX() - to protect TIPC_LOG
|
||||
*
|
||||
* All routines of the form tipc_printbuf_XXX() rely on the caller to prevent
|
||||
* simultaneous use of the print buffer(s) being manipulated.
|
||||
*/
|
||||
|
||||
/**
|
||||
* tipc_printbuf_init - initialize print buffer to empty
|
||||
* @pb: pointer to print buffer structure
|
||||
* @raw: pointer to character array used by print buffer
|
||||
* @size: size of character array
|
||||
*
|
||||
* Makes the print buffer a null device that discards anything written to it
|
||||
* if the character array is too small (or absent).
|
||||
*/
|
||||
|
||||
void tipc_printbuf_init(struct print_buf *pb, char *raw, u32 sz)
|
||||
void tipc_printbuf_init(struct print_buf *pb, char *raw, u32 size)
|
||||
{
|
||||
if (!pb || !raw || (sz < (MAX_STRING + 1)))
|
||||
return;
|
||||
|
||||
pb->crs = pb->buf = raw;
|
||||
pb->size = sz;
|
||||
pb->buf = raw;
|
||||
pb->crs = raw;
|
||||
pb->size = size;
|
||||
pb->next = NULL;
|
||||
pb->buf[0] = 0;
|
||||
pb->buf[sz-1] = ~0;
|
||||
|
||||
if (size < TIPC_PB_MIN_SIZE) {
|
||||
pb->buf = NULL;
|
||||
} else if (raw) {
|
||||
pb->buf[0] = 0;
|
||||
pb->buf[size-1] = ~0;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* tipc_printbuf_reset - reinitialize print buffer to empty state
|
||||
* @pb: pointer to print buffer structure
|
||||
*/
|
||||
|
||||
void tipc_printbuf_reset(struct print_buf *pb)
|
||||
{
|
||||
if (pb && pb->buf)
|
||||
tipc_printbuf_init(pb, pb->buf, pb->size);
|
||||
tipc_printbuf_init(pb, pb->buf, pb->size);
|
||||
}
|
||||
|
||||
/**
|
||||
* tipc_printbuf_empty - test if print buffer is in empty state
|
||||
* @pb: pointer to print buffer structure
|
||||
*
|
||||
* Returns non-zero if print buffer is empty.
|
||||
*/
|
||||
|
||||
int tipc_printbuf_empty(struct print_buf *pb)
|
||||
{
|
||||
return (!pb || !pb->buf || (pb->crs == pb->buf));
|
||||
return (!pb->buf || (pb->crs == pb->buf));
|
||||
}
|
||||
|
||||
/**
|
||||
* tipc_printbuf_validate - check for print buffer overflow
|
||||
* @pb: pointer to print buffer structure
|
||||
*
|
||||
* 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)
|
||||
* Returns length of print buffer data string (including trailing NUL)
|
||||
*/
|
||||
|
||||
int tipc_printbuf_validate(struct print_buf *pb)
|
||||
{
|
||||
char *err = " *** PRINT BUFFER WRAPPED AROUND ***\n";
|
||||
char *err = "\n\n*** PRINT BUFFER OVERFLOW ***\n\n";
|
||||
char *cp_buf;
|
||||
struct print_buf cb;
|
||||
|
||||
if (!pb || !pb->buf)
|
||||
if (!pb->buf)
|
||||
return 0;
|
||||
|
||||
if (pb->buf[pb->size - 1] == '\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);
|
||||
|
|
@ -141,6 +157,8 @@ int tipc_printbuf_validate(struct print_buf *pb)
|
|||
|
||||
/**
|
||||
* tipc_printbuf_move - move print buffer contents to another print buffer
|
||||
* @pb_to: pointer to destination print buffer structure
|
||||
* @pb_from: pointer to source print buffer structure
|
||||
*
|
||||
* Current contents of destination print buffer (if any) are discarded.
|
||||
* Source print buffer becomes empty if a successful move occurs.
|
||||
|
|
@ -152,21 +170,22 @@ void tipc_printbuf_move(struct print_buf *pb_to, struct print_buf *pb_from)
|
|||
|
||||
/* Handle the cases where contents can't be moved */
|
||||
|
||||
if (!pb_to || !pb_to->buf)
|
||||
if (!pb_to->buf)
|
||||
return;
|
||||
|
||||
if (!pb_from || !pb_from->buf) {
|
||||
if (!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 ***");
|
||||
tipc_printf(pb_to, "*** PRINT BUFFER MOVE ERROR ***");
|
||||
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);
|
||||
|
|
@ -175,6 +194,7 @@ void tipc_printbuf_move(struct print_buf *pb_to, struct print_buf *pb_from)
|
|||
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;
|
||||
|
|
@ -184,6 +204,8 @@ void tipc_printbuf_move(struct print_buf *pb_to, struct print_buf *pb_from)
|
|||
|
||||
/**
|
||||
* tipc_printf - append formatted output to print buffer chain
|
||||
* @pb: pointer to chain of print buffers (may be NULL)
|
||||
* @fmt: formatted info to be printed
|
||||
*/
|
||||
|
||||
void tipc_printf(struct print_buf *pb, const char *fmt, ...)
|
||||
|
|
@ -195,8 +217,8 @@ void tipc_printf(struct print_buf *pb, const char *fmt, ...)
|
|||
|
||||
spin_lock_bh(&print_lock);
|
||||
FORMAT(print_string, chars_to_add, fmt);
|
||||
if (chars_to_add >= MAX_STRING)
|
||||
strcpy(print_string, "*** STRING TOO LONG ***");
|
||||
if (chars_to_add >= TIPC_PB_MAX_STR)
|
||||
strcpy(print_string, "*** PRINT BUFFER STRING TOO LONG ***");
|
||||
|
||||
while (pb) {
|
||||
if (pb == TIPC_CONS)
|
||||
|
|
@ -206,6 +228,10 @@ void tipc_printf(struct print_buf *pb, const char *fmt, ...)
|
|||
if (chars_to_add <= chars_left) {
|
||||
strcpy(pb->crs, print_string);
|
||||
pb->crs += chars_to_add;
|
||||
} else if (chars_to_add >= (pb->size - 1)) {
|
||||
strcpy(pb->buf, print_string + chars_to_add + 1
|
||||
- pb->size);
|
||||
pb->crs = pb->buf + pb->size - 1;
|
||||
} else {
|
||||
strcpy(pb->buf, print_string + chars_left);
|
||||
save_char = print_string[chars_left];
|
||||
|
|
@ -224,6 +250,10 @@ void tipc_printf(struct print_buf *pb, const char *fmt, ...)
|
|||
|
||||
/**
|
||||
* TIPC_TEE - perform next output operation on both print buffers
|
||||
* @b0: pointer to chain of print buffers (may be NULL)
|
||||
* @b1: pointer to print buffer to add to chain
|
||||
*
|
||||
* Returns pointer to print buffer chain.
|
||||
*/
|
||||
|
||||
struct print_buf *TIPC_TEE(struct print_buf *b0, struct print_buf *b1)
|
||||
|
|
@ -232,8 +262,6 @@ struct print_buf *TIPC_TEE(struct print_buf *b0, struct print_buf *b1)
|
|||
|
||||
if (!b0 || (b0 == b1))
|
||||
return b1;
|
||||
if (!b1)
|
||||
return b0;
|
||||
|
||||
spin_lock_bh(&print_lock);
|
||||
while (pb->next) {
|
||||
|
|
@ -256,7 +284,7 @@ static void print_to_console(char *crs, int len)
|
|||
int rest = len;
|
||||
|
||||
while (rest > 0) {
|
||||
int sz = rest < MAX_STRING ? rest : MAX_STRING;
|
||||
int sz = rest < TIPC_PB_MAX_STR ? rest : TIPC_PB_MAX_STR;
|
||||
char c = crs[sz];
|
||||
|
||||
crs[sz] = 0;
|
||||
|
|
@ -275,36 +303,48 @@ static void printbuf_dump(struct print_buf *pb)
|
|||
{
|
||||
int len;
|
||||
|
||||
if (!pb->buf) {
|
||||
printk("*** PRINT BUFFER NOT ALLOCATED ***");
|
||||
return;
|
||||
}
|
||||
|
||||
/* 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
|
||||
* @pb: pointer to chain of print buffers
|
||||
*/
|
||||
|
||||
void tipc_dump(struct print_buf *pb, const char *fmt, ...)
|
||||
{
|
||||
struct print_buf *pb_next;
|
||||
int len;
|
||||
|
||||
spin_lock_bh(&print_lock);
|
||||
FORMAT(TIPC_CONS->buf, len, fmt);
|
||||
printk(TIPC_CONS->buf);
|
||||
FORMAT(print_string, len, fmt);
|
||||
printk(print_string);
|
||||
|
||||
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");
|
||||
if (pb != TIPC_CONS) {
|
||||
printk("\n---- Start of %s log dump ----\n\n",
|
||||
(pb == TIPC_LOG) ? "global" : "local");
|
||||
printbuf_dump(pb);
|
||||
tipc_printbuf_reset(pb);
|
||||
printk("\n---- End of dump ----\n");
|
||||
}
|
||||
pb_next = pb->next;
|
||||
pb->next = NULL;
|
||||
pb = pb_next;
|
||||
}
|
||||
spin_unlock_bh(&print_lock);
|
||||
}
|
||||
|
|
@ -324,7 +364,8 @@ void tipc_log_stop(void)
|
|||
}
|
||||
|
||||
/**
|
||||
* tipc_log_reinit - set TIPC log print buffer to specified size
|
||||
* tipc_log_reinit - (re)initialize TIPC log print buffer
|
||||
* @log_size: print buffer size to use
|
||||
*/
|
||||
|
||||
void tipc_log_reinit(int log_size)
|
||||
|
|
@ -332,10 +373,11 @@ void tipc_log_reinit(int log_size)
|
|||
tipc_log_stop();
|
||||
|
||||
if (log_size) {
|
||||
if (log_size <= MAX_STRING)
|
||||
log_size = MAX_STRING + 1;
|
||||
if (log_size < TIPC_PB_MIN_SIZE)
|
||||
log_size = TIPC_PB_MIN_SIZE;
|
||||
spin_lock_bh(&print_lock);
|
||||
tipc_printbuf_init(TIPC_LOG, kmalloc(log_size, GFP_ATOMIC), log_size);
|
||||
tipc_printbuf_init(TIPC_LOG, kmalloc(log_size, GFP_ATOMIC),
|
||||
log_size);
|
||||
spin_unlock_bh(&print_lock);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
* net/tipc/dbg.h: Include file for TIPC print buffer routines
|
||||
*
|
||||
* Copyright (c) 1997-2006, Ericsson AB
|
||||
* Copyright (c) 2005, Wind River Systems
|
||||
* Copyright (c) 2005-2006, Wind River Systems
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
|
|
@ -37,6 +37,14 @@
|
|||
#ifndef _TIPC_DBG_H
|
||||
#define _TIPC_DBG_H
|
||||
|
||||
/**
|
||||
* struct print_buf - TIPC print buffer structure
|
||||
* @buf: pointer to character array containing print buffer contents
|
||||
* @size: size of character array
|
||||
* @crs: pointer to first unused space in character array (i.e. final NUL)
|
||||
* @next: used to link print buffers when printing to more than one at a time
|
||||
*/
|
||||
|
||||
struct print_buf {
|
||||
char *buf;
|
||||
u32 size;
|
||||
|
|
@ -44,7 +52,10 @@ struct print_buf {
|
|||
struct print_buf *next;
|
||||
};
|
||||
|
||||
void tipc_printbuf_init(struct print_buf *pb, char *buf, u32 sz);
|
||||
#define TIPC_PB_MIN_SIZE 64 /* minimum size for a print buffer's array */
|
||||
#define TIPC_PB_MAX_STR 512 /* max printable string (with trailing NUL) */
|
||||
|
||||
void tipc_printbuf_init(struct print_buf *pb, char *buf, u32 size);
|
||||
void tipc_printbuf_reset(struct print_buf *pb);
|
||||
int tipc_printbuf_empty(struct print_buf *pb);
|
||||
int tipc_printbuf_validate(struct print_buf *pb);
|
||||
|
|
|
|||
Loading…
Reference in New Issue