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x86: PM_TRACE support

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Signed-off-by: Nigel Cunningham <nigel@nigel.suspend2.net>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nigel Cunningham 2007-07-21 17:10:41 +02:00 committed by Linus Torvalds
parent 9ef231a436
commit 44bf4cea43
6 changed files with 43 additions and 16 deletions
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7
arch/x86_64/kernel/vmlinux.lds.S
View file

@ -54,6 +54,13 @@ SECTIONS
RODATA
. = ALIGN(4);
.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {
__tracedata_start = .;
*(.tracedata)
__tracedata_end = .;
}
. = ALIGN(PAGE_SIZE); /* Align data segment to page size boundary */
/* Data */
.data : AT(ADDR(.data) - LOAD_OFFSET) {

5
drivers/base/power/trace.c
View file

@ -142,6 +142,7 @@ void set_trace_device(struct device *dev)
{
dev_hash_value = hash_string(DEVSEED, dev->bus_id, DEVHASH);
}
EXPORT_SYMBOL(set_trace_device);
/*
* We could just take the "tracedata" index into the .tracedata
@ -162,6 +163,7 @@ void generate_resume_trace(void *tracedata, unsigned int user)
file_hash_value = hash_string(lineno, file, FILEHASH);
set_magic_time(user_hash_value, file_hash_value, dev_hash_value);
}
EXPORT_SYMBOL(generate_resume_trace);
extern char __tracedata_start, __tracedata_end;
static int show_file_hash(unsigned int value)
@ -170,7 +172,8 @@ static int show_file_hash(unsigned int value)
char *tracedata;
match = 0;
for (tracedata = &__tracedata_start ; tracedata < &__tracedata_end ; tracedata += 6) {
for (tracedata = &__tracedata_start ; tracedata < &__tracedata_end ;
tracedata += 2 + sizeof(unsigned long)) {
unsigned short lineno = *(unsigned short *)tracedata;
const char *file = *(const char **)(tracedata + 2);
unsigned int hash = hash_string(lineno, file, FILEHASH);

13
include/asm-i386/resume-trace.h Normal file
View file

@ -0,0 +1,13 @@
#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)

13
include/asm-x86_64/resume-trace.h Normal file
View file

@ -0,0 +1,13 @@
#define TRACE_RESUME(user) do { \
if (pm_trace_enabled) { \
void *tracedata; \
asm volatile("movq $1f,%0\n" \
".section .tracedata,\"a\"\n" \
"1:\t.word %c1\n" \
"\t.quad %c2\n" \
".previous" \
:"=r" (tracedata) \
: "i" (__LINE__), "i" (__FILE__)); \
generate_resume_trace(tracedata, user); \
} \
} while (0)

19
include/linux/resume-trace.h
View file

@ -2,6 +2,7 @@
#define RESUME_TRACE_H
#ifdef CONFIG_PM_TRACE
#include <asm/resume-trace.h>
extern int pm_trace_enabled;
@ -9,20 +10,10 @@ 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 { \
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)
#define TRACE_DEVICE(dev) do { \
if (pm_trace_enabled) \
set_trace_device(dev); \
} while(0)
#else

2
kernel/power/Kconfig
View file

@ -57,7 +57,7 @@ config DISABLE_CONSOLE_SUSPEND
config PM_TRACE
bool "Suspend/resume event tracing"
depends on PM_DEBUG && X86_32 && EXPERIMENTAL
depends on PM_DEBUG && X86 && EXPERIMENTAL
default n
---help---
This enables some cheesy code to save the last PM event point in the