Re: [RFC][PATCH] PM: Add pm_trace switch

[Pavel Machek <pavel@ucw.cz>]

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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