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Date: Thu, 03 May 2012 02:29:59 +0200
From: Kay Sievers <kay@...y.org>
To: Greg Kroah-Hartmann <greg@...ah.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH RESEND 3/3] driver-core: extend dev_printk() to pass
structured data
From: Kay Sievers <kay@...y.org>
Subject: driver-core: extend dev_printk() to pass structured data
Extends dev_printk() to attach a dictionary with a device identifier
and the driver core subsystem name to logged messages, which makes
dev_prink() reliable machine-readable. In addition to the printed
plain text message, it creates these properties:
SUBSYSTEM= - the driver-core subsytem name
DEVICE=
b12:8 - block dev_t
c127:3 - char dev_t
n8 - netdev ifindex
+sound:card0 - subsystem:devname
Tested-by: William Douglas <william.douglas@...el.com>
Signed-off-by: Kay Sievers <kay@...y.org>
---
drivers/base/core.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 49 insertions(+), 3 deletions(-)
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -25,6 +25,7 @@
#include <linux/mutex.h>
#include <linux/async.h>
#include <linux/pm_runtime.h>
+#include <linux/netdevice.h>
#include "base.h"
#include "power/power.h"
@@ -1843,15 +1844,60 @@ void device_shutdown(void)
*/
#ifdef CONFIG_PRINTK
-
int __dev_printk(const char *level, const struct device *dev,
struct va_format *vaf)
{
+ char dict[128];
+ size_t dictlen = 0;
+ const char *subsys;
+
if (!dev)
return printk("%s(NULL device *): %pV", level, vaf);
- return printk("%s%s %s: %pV",
- level, dev_driver_string(dev), dev_name(dev), vaf);
+ if (dev->class)
+ subsys = dev->class->name;
+ else if (dev->bus)
+ subsys = dev->bus->name;
+ else
+ goto skip;
+
+ dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen,
+ "SUBSYSTEM=%s", subsys);
+
+ /*
+ * Add device identifier DEVICE=:
+ * b12:8 block dev_t
+ * c127:3 char dev_t
+ * n8 netdev ifindex
+ * +sound:card0 subsystem:devname
+ */
+ if (MAJOR(dev->devt)) {
+ char c;
+
+ if (strcmp(subsys, "block") == 0)
+ c = 'b';
+ else
+ c = 'c';
+ dictlen++;
+ dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen,
+ "DEVICE=%c%u:%u",
+ c, MAJOR(dev->devt), MINOR(dev->devt));
+ } else if (strcmp(subsys, "net") == 0) {
+ struct net_device *net = to_net_dev(dev);
+
+ dictlen++;
+ dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen,
+ "DEVICE=n%u", net->ifindex);
+ } else {
+ dictlen++;
+ dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen,
+ "DEVICE=+%s:%s", subsys, dev_name(dev));
+ }
+skip:
+ return printk_emit(0, level[1] - '0',
+ dictlen ? dict : NULL, dictlen,
+ "%s %s: %pV",
+ dev_driver_string(dev), dev_name(dev), vaf);
}
EXPORT_SYMBOL(__dev_printk);
--
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