While most users of the hcall tracepoints will only want the opcode and return
code, some will want all the arguments. To avoid the complexity of using
varargs we pass a pointer to the register save area which contain all
arguments.
Signed-off-by: Anton Blanchard <an...@samba.org>
---
Index: linux.trees.git/arch/powerpc/platforms/pseries/hvCall.S
===================================================================
--- linux.trees.git.orig/arch/powerpc/platforms/pseries/hvCall.S
2009-10-27 14:29:09.000000000 +1100
+++ linux.trees.git/arch/powerpc/platforms/pseries/hvCall.S 2009-10-27
14:29:16.000000000 +1100
@@ -30,7 +30,7 @@ hcall_tracepoint_refcount:
* in early init (eg when populating the MMU hashtable) by using an
* unconditional cpu feature.
*/
-#define HCALL_INST_PRECALL \
+#define HCALL_INST_PRECALL(FIRST_REG) \
BEGIN_FTR_SECTION; \
b 1f; \
END_FTR_SECTION(0, 1); \
@@ -47,6 +47,7 @@ END_FTR_SECTION(0, 1);
\
std r9,STK_PARM(r9)(r1); \
std r10,STK_PARM(r10)(r1); \
std r0,16(r1); \
+ addi r4,r1,STK_PARM(FIRST_REG); \
stdu r1,-STACK_FRAME_OVERHEAD(r1); \
bl .__trace_hcall_entry; \
addi r1,r1,STACK_FRAME_OVERHEAD; \
@@ -68,7 +69,7 @@ END_FTR_SECTION(0, 1);
\
* in early init (eg when populating the MMU hashtable) by using an
* unconditional cpu feature.
*/
-#define HCALL_INST_POSTCALL \
+#define __HCALL_INST_POSTCALL \
BEGIN_FTR_SECTION; \
b 1f; \
END_FTR_SECTION(0, 1); \
@@ -88,9 +89,19 @@ END_FTR_SECTION(0, 1);
\
ld r3,STK_PARM(r3)(r1); \
mtlr r0; \
1:
+
+#define HCALL_INST_POSTCALL_NORETS \
+ li r5,0; \
+ __HCALL_INST_POSTCALL
+
+#define HCALL_INST_POSTCALL(BUFREG) \
+ mr r5,BUFREG; \
+ __HCALL_INST_POSTCALL
+
#else
-#define HCALL_INST_PRECALL
-#define HCALL_INST_POSTCALL
+#define HCALL_INST_PRECALL(FIRST_ARG)
+#define HCALL_INST_POSTCALL_NORETS
+#define HCALL_INST_POSTCALL(BUFREG)
#endif
.text
@@ -101,11 +112,11 @@ _GLOBAL(plpar_hcall_norets)
mfcr r0
stw r0,8(r1)
- HCALL_INST_PRECALL
+ HCALL_INST_PRECALL(r4)
HVSC /* invoke the hypervisor */
- HCALL_INST_POSTCALL
+ HCALL_INST_POSTCALL_NORETS
lwz r0,8(r1)
mtcrf 0xff,r0
@@ -117,7 +128,7 @@ _GLOBAL(plpar_hcall)
mfcr r0
stw r0,8(r1)
- HCALL_INST_PRECALL
+ HCALL_INST_PRECALL(r5)
std r4,STK_PARM(r4)(r1) /* Save ret buffer */
@@ -136,7 +147,7 @@ _GLOBAL(plpar_hcall)
std r6, 16(r12)
std r7, 24(r12)
- HCALL_INST_POSTCALL
+ HCALL_INST_POSTCALL(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
@@ -183,7 +194,7 @@ _GLOBAL(plpar_hcall9)
mfcr r0
stw r0,8(r1)
- HCALL_INST_PRECALL
+ HCALL_INST_PRECALL(r5)
std r4,STK_PARM(r4)(r1) /* Save ret buffer */
@@ -211,7 +222,7 @@ _GLOBAL(plpar_hcall9)
std r11,56(r12)
std r0, 64(r12)
- HCALL_INST_POSTCALL
+ HCALL_INST_POSTCALL(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
Index: linux.trees.git/arch/powerpc/include/asm/trace.h
===================================================================
--- linux.trees.git.orig/arch/powerpc/include/asm/trace.h 2009-10-27
14:28:15.000000000 +1100
+++ linux.trees.git/arch/powerpc/include/asm/trace.h 2009-10-27
14:29:16.000000000 +1100
@@ -81,9 +81,9 @@ extern void hcall_tracepoint_unregfunc(v
TRACE_EVENT_FN(hcall_entry,
- TP_PROTO(unsigned long opcode),
+ TP_PROTO(unsigned long opcode, unsigned long *args),
- TP_ARGS(opcode),
+ TP_ARGS(opcode, args),
TP_STRUCT__entry(
__field(unsigned long, opcode)
@@ -100,9 +100,10 @@ TRACE_EVENT_FN(hcall_entry,
TRACE_EVENT_FN(hcall_exit,
- TP_PROTO(unsigned long opcode, unsigned long retval),
+ TP_PROTO(unsigned long opcode, unsigned long retval,
+ unsigned long *retbuf),
- TP_ARGS(opcode, retval),
+ TP_ARGS(opcode, retval, retbuf),
TP_STRUCT__entry(
__field(unsigned long, opcode)
Index: linux.trees.git/arch/powerpc/platforms/pseries/lpar.c
===================================================================
--- linux.trees.git.orig/arch/powerpc/platforms/pseries/lpar.c 2009-10-27
14:28:16.000000000 +1100
+++ linux.trees.git/arch/powerpc/platforms/pseries/lpar.c 2009-10-27
14:29:16.000000000 +1100
@@ -683,13 +683,14 @@ void hcall_tracepoint_unregfunc(void)
hcall_tracepoint_refcount--;
}
-void __trace_hcall_entry(unsigned long opcode)
+void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
{
- trace_hcall_entry(opcode);
+ trace_hcall_entry(opcode, args);
}
-void __trace_hcall_exit(long opcode, unsigned long retval)
+void __trace_hcall_exit(long opcode, unsigned long retval,
+ unsigned long *retbuf)
{
- trace_hcall_exit(opcode, retval);
+ trace_hcall_exit(opcode, retval, retbuf);
}
#endif
Index: linux.trees.git/arch/powerpc/platforms/pseries/hvCall_inst.c
===================================================================
--- linux.trees.git.orig/arch/powerpc/platforms/pseries/hvCall_inst.c
2009-10-27 14:28:16.000000000 +1100
+++ linux.trees.git/arch/powerpc/platforms/pseries/hvCall_inst.c
2009-10-27 14:29:16.000000000 +1100
@@ -102,7 +102,7 @@ static const struct file_operations hcal
#define CPU_NAME_BUF_SIZE 32
-static void probe_hcall_entry(unsigned long opcode)
+static void probe_hcall_entry(unsigned long opcode, unsigned long *args)
{
struct hcall_stats *h;
@@ -114,7 +114,8 @@ static void probe_hcall_entry(unsigned l
h->purr_start = mfspr(SPRN_PURR);
}
-static void probe_hcall_exit(unsigned long opcode, unsigned long retval)
+static void probe_hcall_exit(unsigned long opcode, unsigned long retval,
+ unsigned long *retbuf)
{
struct hcall_stats *h;
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