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powerpc: tracing: Give hypervisor call tracepoints access to arguments

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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 contains all the arguments.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Blanchard 2009-10-26 18:51:09 +00:00 committed by Paul Mackerras
parent c8cd093a6e
commit 6f26353ca2
4 changed files with 34 additions and 20 deletions
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9
arch/powerpc/include/asm/trace.h
View File

@ -82,9 +82,9 @@ extern void hcall_tracepoint_unregfunc(void);
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)
@ -101,9 +101,10 @@ 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)

31
arch/powerpc/platforms/pseries/hvCall.S
View File

@ -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

5
arch/powerpc/platforms/pseries/hvCall_inst.c
View File

@ -102,7 +102,7 @@ static const struct file_operations hcall_inst_seq_fops = {
#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 long opcode)
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;

9
arch/powerpc/platforms/pseries/lpar.c
View File

@ -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