* [RFC][PATCH] PM: Add pm_trace switch
@ 2006-08-17 12:16 Rafael J. Wysocki
2006-08-17 12:19 ` Pavel Machek
0 siblings, 1 reply; 2+ messages in thread
From: Rafael J. Wysocki @ 2006-08-17 12:16 UTC (permalink / raw)
To: LKML; +Cc: Andrew Morton, Pavel Machek, Greg KH
Add the pm_trace attribute in /sys/power which has to be set to one so that
the "PM tracing" functionality is really enabled.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
include/linux/resume-trace.h | 24 ++++++++++++++----------
kernel/power/main.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+), 10 deletions(-)
Index: linux-2.6.18-rc4-mm1/include/linux/resume-trace.h
===================================================================
--- linux-2.6.18-rc4-mm1.orig/include/linux/resume-trace.h 2006-08-13 14:54:42.000000000 +0200
+++ linux-2.6.18-rc4-mm1/include/linux/resume-trace.h 2006-08-17 12:27:34.000000000 +0200
@@ -3,21 +3,25 @@
#ifdef CONFIG_PM_TRACE
+extern int pm_trace_enabled;
+
struct device;
extern void set_trace_device(struct device *);
extern void generate_resume_trace(void *tracedata, unsigned int user);
#define TRACE_DEVICE(dev) set_trace_device(dev)
-#define TRACE_RESUME(user) do { \
- void *tracedata; \
- asm volatile("movl $1f,%0\n" \
- ".section .tracedata,\"a\"\n" \
- "1:\t.word %c1\n" \
- "\t.long %c2\n" \
- ".previous" \
- :"=r" (tracedata) \
- : "i" (__LINE__), "i" (__FILE__)); \
- generate_resume_trace(tracedata, user); \
+#define TRACE_RESUME(user) do { \
+ if (pm_trace_enabled) { \
+ void *tracedata; \
+ asm volatile("movl $1f,%0\n" \
+ ".section .tracedata,\"a\"\n" \
+ "1:\t.word %c1\n" \
+ "\t.long %c2\n" \
+ ".previous" \
+ :"=r" (tracedata) \
+ : "i" (__LINE__), "i" (__FILE__)); \
+ generate_resume_trace(tracedata, user); \
+ } \
} while (0)
#else
Index: linux-2.6.18-rc4-mm1/kernel/power/main.c
===================================================================
--- linux-2.6.18-rc4-mm1.orig/kernel/power/main.c 2006-08-14 20:51:47.000000000 +0200
+++ linux-2.6.18-rc4-mm1/kernel/power/main.c 2006-08-17 12:34:23.000000000 +0200
@@ -17,6 +17,7 @@
#include <linux/pm.h>
#include <linux/console.h>
#include <linux/cpu.h>
+#include <linux/resume-trace.h>
#include "power.h"
@@ -285,10 +286,39 @@ static ssize_t state_store(struct subsys
power_attr(state);
+#ifdef CONFIG_PM_TRACE
+int pm_trace_enabled;
+
+static ssize_t pm_trace_show(struct subsystem * subsys, char * buf)
+{
+ return sprintf(buf, "%d\n", pm_trace_enabled);
+}
+
+static ssize_t
+pm_trace_store(struct subsystem * subsys, const char * buf, size_t n)
+{
+ int val;
+
+ if (sscanf(buf, "%d", &val) == 1) {
+ pm_trace_enabled = !!val;
+ return n;
+ }
+ return -EINVAL;
+}
+
+power_attr(pm_trace);
+
+static struct attribute * g[] = {
+ &state_attr.attr,
+ &pm_trace_attr.attr,
+ NULL,
+};
+#else
static struct attribute * g[] = {
&state_attr.attr,
NULL,
};
+#endif /* CONFIG_PM_TRACE */
static struct attribute_group attr_group = {
.attrs = g,
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [RFC][PATCH] PM: Add pm_trace switch
2006-08-17 12:16 [RFC][PATCH] PM: Add pm_trace switch Rafael J. Wysocki
@ 2006-08-17 12:19 ` Pavel Machek
0 siblings, 0 replies; 2+ messages in thread
From: Pavel Machek @ 2006-08-17 12:19 UTC (permalink / raw)
To: Rafael J. Wysocki; +Cc: LKML, Andrew Morton, Greg KH
On Thu 2006-08-17 14:16:18, Rafael J. Wysocki wrote:
> Add the pm_trace attribute in /sys/power which has to be set to one so that
> the "PM tracing" functionality is really enabled.
>
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
ACK and thanks for patience.
> ---
> include/linux/resume-trace.h | 24 ++++++++++++++----------
> kernel/power/main.c | 30 ++++++++++++++++++++++++++++++
> 2 files changed, 44 insertions(+), 10 deletions(-)
>
> Index: linux-2.6.18-rc4-mm1/include/linux/resume-trace.h
> ===================================================================
> --- linux-2.6.18-rc4-mm1.orig/include/linux/resume-trace.h 2006-08-13 14:54:42.000000000 +0200
> +++ linux-2.6.18-rc4-mm1/include/linux/resume-trace.h 2006-08-17 12:27:34.000000000 +0200
> @@ -3,21 +3,25 @@
>
> #ifdef CONFIG_PM_TRACE
>
> +extern int pm_trace_enabled;
> +
> struct device;
> extern void set_trace_device(struct device *);
> extern void generate_resume_trace(void *tracedata, unsigned int user);
>
> #define TRACE_DEVICE(dev) set_trace_device(dev)
> -#define TRACE_RESUME(user) do { \
> - void *tracedata; \
> - asm volatile("movl $1f,%0\n" \
> - ".section .tracedata,\"a\"\n" \
> - "1:\t.word %c1\n" \
> - "\t.long %c2\n" \
> - ".previous" \
> - :"=r" (tracedata) \
> - : "i" (__LINE__), "i" (__FILE__)); \
> - generate_resume_trace(tracedata, user); \
> +#define TRACE_RESUME(user) do { \
> + if (pm_trace_enabled) { \
> + void *tracedata; \
> + asm volatile("movl $1f,%0\n" \
> + ".section .tracedata,\"a\"\n" \
> + "1:\t.word %c1\n" \
> + "\t.long %c2\n" \
> + ".previous" \
> + :"=r" (tracedata) \
> + : "i" (__LINE__), "i" (__FILE__)); \
> + generate_resume_trace(tracedata, user); \
> + } \
> } while (0)
>
> #else
> Index: linux-2.6.18-rc4-mm1/kernel/power/main.c
> ===================================================================
> --- linux-2.6.18-rc4-mm1.orig/kernel/power/main.c 2006-08-14 20:51:47.000000000 +0200
> +++ linux-2.6.18-rc4-mm1/kernel/power/main.c 2006-08-17 12:34:23.000000000 +0200
> @@ -17,6 +17,7 @@
> #include <linux/pm.h>
> #include <linux/console.h>
> #include <linux/cpu.h>
> +#include <linux/resume-trace.h>
>
> #include "power.h"
>
> @@ -285,10 +286,39 @@ static ssize_t state_store(struct subsys
>
> power_attr(state);
>
> +#ifdef CONFIG_PM_TRACE
> +int pm_trace_enabled;
> +
> +static ssize_t pm_trace_show(struct subsystem * subsys, char * buf)
> +{
> + return sprintf(buf, "%d\n", pm_trace_enabled);
> +}
> +
> +static ssize_t
> +pm_trace_store(struct subsystem * subsys, const char * buf, size_t n)
> +{
> + int val;
> +
> + if (sscanf(buf, "%d", &val) == 1) {
> + pm_trace_enabled = !!val;
> + return n;
> + }
> + return -EINVAL;
> +}
> +
> +power_attr(pm_trace);
> +
> +static struct attribute * g[] = {
> + &state_attr.attr,
> + &pm_trace_attr.attr,
> + NULL,
> +};
> +#else
> static struct attribute * g[] = {
> &state_attr.attr,
> NULL,
> };
> +#endif /* CONFIG_PM_TRACE */
>
> static struct attribute_group attr_group = {
> .attrs = g,
> -
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--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply [flat|nested] 2+ messages in thread
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