x86: PM_TRACE support
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>
diff --git a/arch/x86_64/kernel/vmlinux.lds.S b/arch/x86_64/kernel/vmlinux.lds.S
index c2d5a84..8778848 100644
--- a/arch/x86_64/kernel/vmlinux.lds.S
+++ b/arch/x86_64/kernel/vmlinux.lds.S
@@ -54,6 +54,13 @@
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) {
diff --git a/drivers/base/power/trace.c b/drivers/base/power/trace.c
index a9ab30f..2b0c601 100644
--- a/drivers/base/power/trace.c
+++ b/drivers/base/power/trace.c
@@ -142,6 +142,7 @@
{
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 @@
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 @@
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);
diff --git a/include/asm-i386/resume-trace.h b/include/asm-i386/resume-trace.h
new file mode 100644
index 0000000..ec9cfd65
--- /dev/null
+++ b/include/asm-i386/resume-trace.h
@@ -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)
diff --git a/include/asm-x86_64/resume-trace.h b/include/asm-x86_64/resume-trace.h
new file mode 100644
index 0000000..34bf998
--- /dev/null
+++ b/include/asm-x86_64/resume-trace.h
@@ -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)
diff --git a/include/linux/resume-trace.h b/include/linux/resume-trace.h
index 81e9299..f3f4f28 100644
--- a/include/linux/resume-trace.h
+++ b/include/linux/resume-trace.h
@@ -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 @@
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
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 7358609..c1a106d 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -57,7 +57,7 @@
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