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log: Add a flag to enable log drivers

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At present there is no way to disable a log driver. But the syslog driver
causes (attempted) network traffic in sandbox every time a log message
is printed, which is often.

Add a flag to enable a log driver. Adjust struct log_device to use a short
for next_filter_num so that no more memory is used for devices. Also fix
a missing line in the struct log_driver comment while here.

To maintain compatibility, enable it for all drivers for now.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-09-12 12:28:47 -06:00 committed by Tom Rini
parent 26637e2e4c
commit b45203004e
4 changed files with 15 additions and 2 deletions
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4
common/log.c
View file

@ -207,7 +207,8 @@ static int log_dispatch(struct log_rec *rec)
/* Emit message */
processing_msg = 1;
list_for_each_entry(ldev, &gd->log_head, sibling_node) {
if (log_passes_filters(ldev, rec))
if ((ldev->flags & LOGDF_ENABLE) &&
log_passes_filters(ldev, rec))
ldev->drv->emit(ldev, rec);
}
processing_msg = 0;
@ -329,6 +330,7 @@ int log_init(void)
}
INIT_LIST_HEAD(&ldev->filter_head);
ldev->drv = drv;
ldev->flags = drv->flags;
list_add_tail(&ldev->sibling_node,
(struct list_head *)&gd->log_head);
drv++;

1
common/log_console.c
View file

@ -44,4 +44,5 @@ static int log_console_emit(struct log_device *ldev, struct log_rec *rec)
LOG_DRIVER(console) = {
.name = "console",
.emit = log_console_emit,
.flags = LOGDF_ENABLE,
};

1
common/log_syslog.c
View file

@ -107,4 +107,5 @@ out:
LOG_DRIVER(syslog) = {
.name = "syslog",
.emit = log_syslog_emit,
.flags = LOGDF_ENABLE,
};

11
include/log.h
View file

@ -307,10 +307,16 @@ struct log_rec {
struct log_device;
enum log_device_flags {
LOGDF_ENABLE = BIT(0), /* Device is enabled */
};
/**
* struct log_driver - a driver which accepts and processes log records
*
* @name: Name of driver
* @emit: Method to call to emit a log record via this device
* @flags: Initial value for flags (use LOGDF_ENABLE to enable on start-up)
*/
struct log_driver {
const char *name;
@ -321,6 +327,7 @@ struct log_driver {
* for processing. The filter is checked before calling this function.
*/
int (*emit)(struct log_device *ldev, struct log_rec *rec);
unsigned short flags;
};
/**
@ -333,12 +340,14 @@ struct log_driver {
* @next_filter_num: Seqence number of next filter filter added (0=no filters
* yet). This increments with each new filter on the device, but never
* decrements
* @flags: Flags for this filter (enum log_device_flags)
* @drv: Pointer to driver for this device
* @filter_head: List of filters for this device
* @sibling_node: Next device in the list of all devices
*/
struct log_device {
int next_filter_num;
unsigned short next_filter_num;
unsigned short flags;
struct log_driver *drv;
struct list_head filter_head;
struct list_head sibling_node;