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log: Allow LOG_DEBUG to always enable log output

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At present if CONFIG_LOG enabled, putting LOG_DEBUG at the top of a file
(before log.h inclusion) causes _log() to be executed for every log()
call, regardless of the build- or run-time logging level.

However there is no guarantee that the log record will actually be
displayed. If the current log level is lower than LOGL_DEBUG then it will
not be.

Add a way to signal that the log record should always be displayed and
update log_passes_filters() to handle this.

With the new behaviour, log_debug() will always log if LOG_DEBUG is
enabled.

Move log_test_syslog_nodebug() into its own file since it cannot be made
to work where it is, with LOG_DEBUG defined.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-09-12 11:13:34 -06:00 committed by Tom Rini
parent 0437cc4155
commit 52d3df7fef
7 changed files with 129 additions and 84 deletions
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6
common/log.c
View File

@ -157,6 +157,9 @@ static bool log_passes_filters(struct log_device *ldev, struct log_rec *rec)
{
struct log_filter *filt;
if (rec->force_debug)
return true;
/* If there are no filters, filter on the default log level */
if (list_empty(&ldev->filter_head)) {
if (rec->level > gd->default_log_level)
@ -219,7 +222,8 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
va_list args;
rec.cat = cat;
rec.level = level;
rec.level = level & LOGL_LEVEL_MASK;
rec.force_debug = level & LOGL_FORCE_DEBUG;
rec.file = file;
rec.line = line;
rec.func = func;

7
doc/README.log
View File

@ -78,11 +78,8 @@ Sometimes it is useful to turn on logging just in one file. You can use this:
#define LOG_DEBUG
to enable building in of all logging statements in a single file. Put it at
the top of the file, before any #includes.
To actually get U-Boot to output this you need to also set the default logging
level - e.g. set CONFIG_LOG_DEFAULT_LEVEL to 7 (LOGL_DEBUG) or more. Otherwise
debug output is suppressed and will not be generated.
the top of the file, before any #includes. This overrides any log-level setting
in U-Boot, including CONFIG_LOG_DEFAULT_LEVEL, but just for that file.
Convenience functions

18
include/log.h
View File

@ -33,6 +33,9 @@ enum log_level_t {
LOGL_COUNT,
LOGL_NONE,
LOGL_LEVEL_MASK = 0xf, /* Mask for valid log levels */
LOGL_FORCE_DEBUG = 0x10, /* Mask to force output due to LOG_DEBUG */
LOGL_FIRST = LOGL_EMERG,
LOGL_MAX = LOGL_DEBUG_IO,
};
@ -133,7 +136,7 @@ static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
#if CONFIG_IS_ENABLED(LOG)
#ifdef LOG_DEBUG
#define _LOG_DEBUG 1
#define _LOG_DEBUG LOGL_FORCE_DEBUG
#else
#define _LOG_DEBUG 0
#endif
@ -141,9 +144,11 @@ static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
/* Emit a log record if the level is less that the maximum */
#define log(_cat, _level, _fmt, _args...) ({ \
int _l = _level; \
if (CONFIG_IS_ENABLED(LOG) && (_l <= _LOG_MAX_LEVEL || _LOG_DEBUG)) \
_log((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
__func__, \
if (CONFIG_IS_ENABLED(LOG) && \
(_LOG_DEBUG != 0 || _l <= _LOG_MAX_LEVEL)) \
_log((enum log_category_t)(_cat), \
(enum log_level_t)(_l | _LOG_DEBUG), __FILE__, \
__LINE__, __func__, \
pr_fmt(_fmt), ##_args); \
})
#else
@ -279,8 +284,12 @@ void __assert_fail(const char *assertion, const char *file, unsigned int line,
* Memebers marked as 'allocated' are allocated (e.g. via strdup()) by the log
* system.
*
* TODO(sjg@chromium.org): Compress this struct down a bit to reduce space, e.g.
* a single u32 for cat, level, line and force_debug
*
* @cat: Category, representing a uclass or part of U-Boot
* @level: Severity level, less severe is higher
* @force_debug: Force output of debug
* @file: Name of file where the log record was generated (not allocated)
* @line: Line number where the log record was generated
* @func: Function where the log record was generated (not allocated)
@ -289,6 +298,7 @@ void __assert_fail(const char *assertion, const char *file, unsigned int line,
struct log_rec {
enum log_category_t cat;
enum log_level_t level;
bool force_debug;
const char *file;
int line;
const char *func;

1
test/log/Makefile
View File

@ -10,6 +10,7 @@ obj-y += test-main.o
ifdef CONFIG_SANDBOX
obj-$(CONFIG_LOG_SYSLOG) += syslog_test.o
obj-$(CONFIG_LOG_SYSLOG) += syslog_test_ndebug.o
endif
ifndef CONFIG_LOG

76
test/log/syslog_test.c
View File

@ -18,48 +18,11 @@
#include <test/suites.h>
#include <test/ut.h>
#include <asm/eth.h>
#include <syslog_test.h>
DECLARE_GLOBAL_DATA_PTR;
#define LOGF_TEST (BIT(LOGF_FUNC) | BIT(LOGF_MSG))
/**
* struct sb_log_env - private data for sandbox ethernet driver
*
* This structure is used for the private data of the sandbox ethernet
* driver.
*
* @expected: string expected to be written by the syslog driver
* @uts: unit test state
*/
struct sb_log_env {
const char *expected;
struct unit_test_state *uts;
};
/**
* sb_log_tx_handler() - transmit callback function
*
* This callback function is invoked when a network package is sent using the
* sandbox Ethernet driver. The private data of the driver holds a sb_log_env
* structure with the unit test state and the expected UDP payload.
*
* The following checks are executed:
*
* * the Ethernet packet indicates a IP broadcast message
* * the IP header is for a local UDP broadcast message to port 514
* * the UDP payload matches the expected string
*
* After testing the pointer to the expected string is set to NULL to signal
* that the callback function has been called.
*
* @dev: sandbox ethernet device
* @packet: Ethernet packet
* @len: length of Ethernet packet
* Return: 0 = success
*/
static int sb_log_tx_handler(struct udevice *dev, void *packet,
unsigned int len)
int sb_log_tx_handler(struct udevice *dev, void *packet, unsigned int len)
{
struct eth_sandbox_priv *priv = dev_get_priv(dev);
struct sb_log_env *env = priv->priv;
@ -251,38 +214,3 @@ static int log_test_syslog_debug(struct unit_test_state *uts)
return 0;
}
LOG_TEST(log_test_syslog_debug);
/**
* log_test_syslog_nodebug() - test logging level filter
*
* Verify that log_debug() does not lead to a log message if the logging level
* is set to LOGL_INFO.
*
* @uts: unit test state
* Return: 0 = success
*/
static int log_test_syslog_nodebug(struct unit_test_state *uts)
{
int old_log_level = gd->default_log_level;
struct sb_log_env env;
gd->log_fmt = LOGF_TEST;
gd->default_log_level = LOGL_INFO;
env_set("ethact", "eth@10002000");
env_set("log_hostname", "sandbox");
env.expected = "<7>sandbox uboot: log_test_syslog_nodebug() "
"testing log_debug\n";
env.uts = uts;
sandbox_eth_set_tx_handler(0, sb_log_tx_handler);
/* Used by ut_assert macros in the tx_handler */
sandbox_eth_set_priv(0, &env);
log_debug("testing %s\n", "log_debug");
sandbox_eth_set_tx_handler(0, NULL);
/* Check that the callback function was not called */
ut_assertnonnull(env.expected);
gd->default_log_level = old_log_level;
gd->log_fmt = log_get_default_format();
return 0;
}
LOG_TEST(log_test_syslog_nodebug);

50
test/log/syslog_test.h Normal file
View File

@ -0,0 +1,50 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
*
* Header file for logging tests
*/
#ifndef __SYSLOG_TEST_H
#define __SYSLOG_TEST_H
#define LOGF_TEST (BIT(LOGF_FUNC) | BIT(LOGF_MSG))
/**
* struct sb_log_env - private data for sandbox ethernet driver
*
* This structure is used for the private data of the sandbox ethernet
* driver.
*
* @expected: string expected to be written by the syslog driver
* @uts: unit test state
*/
struct sb_log_env {
const char *expected;
struct unit_test_state *uts;
};
/**
* sb_log_tx_handler() - transmit callback function
*
* This callback function is invoked when a network package is sent using the
* sandbox Ethernet driver. The private data of the driver holds a sb_log_env
* structure with the unit test state and the expected UDP payload.
*
* The following checks are executed:
*
* * the Ethernet packet indicates a IP broadcast message
* * the IP header is for a local UDP broadcast message to port 514
* * the UDP payload matches the expected string
*
* After testing the pointer to the expected string is set to NULL to signal
* that the callback function has been called.
*
* @dev: sandbox ethernet device
* @packet: Ethernet packet
* @len: length of Ethernet packet
* Return: 0 = success
*/
int sb_log_tx_handler(struct udevice *dev, void *packet, unsigned int len);
#endif

55
test/log/syslog_test_ndebug.c Normal file
View File

@ -0,0 +1,55 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
*
* Logging function tests for CONFIG_LOG_SYSLOG=y.
*
* Invoke the test with: ./u-boot -d arch/sandbox/dts/test.dtb
*/
#include <common.h>
#include <dm/device.h>
#include <hexdump.h>
#include <test/log.h>
#include <test/test.h>
#include <test/suites.h>
#include <test/ut.h>
#include <asm/eth.h>
#include <syslog_test.h>
DECLARE_GLOBAL_DATA_PTR;
/**
* log_test_syslog_nodebug() - test logging level filter
*
* Verify that log_debug() does not lead to a log message if the logging level
* is set to LOGL_INFO.
*
* @uts: unit test state
* Return: 0 = success
*/
static int log_test_syslog_nodebug(struct unit_test_state *uts)
{
int old_log_level = gd->default_log_level;
struct sb_log_env env;
gd->log_fmt = LOGF_TEST;
gd->default_log_level = LOGL_INFO;
env_set("ethact", "eth@10002000");
env_set("log_hostname", "sandbox");
env.expected = "<7>sandbox uboot: log_test_syslog_nodebug() "
"testing log_debug\n";
env.uts = uts;
sandbox_eth_set_tx_handler(0, sb_log_tx_handler);
/* Used by ut_assert macros in the tx_handler */
sandbox_eth_set_priv(0, &env);
log_debug("testing %s\n", "log_debug");
sandbox_eth_set_tx_handler(0, NULL);
/* Check that the callback function was not called */
ut_assertnonnull(env.expected);
gd->default_log_level = old_log_level;
gd->log_fmt = log_get_default_format();
return 0;
}
LOG_TEST(log_test_syslog_nodebug);