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powerpc/perf: Export memory hierarchy info to user space

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The LDST field and DATA_SRC in SIER identifies the memory hierarchy level
(eg: L1, L2 etc), from which a data-cache miss for a marked instruction
was satisfied. Use the 'perf_mem_data_src' object to export this
hierarchy level to user space.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Madhavan Srinivasan 2017-04-11 07:21:06 +05:30 committed by Michael Ellerman
parent 8c5073db0e
commit 79e96f8f93
4 changed files with 95 additions and 1 deletions
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2
arch/powerpc/include/asm/perf_event_server.h
View File

@ -38,6 +38,8 @@ struct power_pmu {
unsigned long *valp);
int (*get_alternatives)(u64 event_id, unsigned int flags,
u64 alt[]);
void (*get_mem_data_src)(union perf_mem_data_src *dsrc,
u32 flags, struct pt_regs *regs);
u64 (*bhrb_filter_map)(u64 branch_sample_type);
void (*config_bhrb)(u64 pmu_bhrb_filter);
void (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]);

4
arch/powerpc/perf/core-book3s.c
View File

@ -2049,6 +2049,10 @@ static void record_and_restart(struct perf_event *event, unsigned long val,
data.br_stack = &cpuhw->bhrb_stack;
}
if (event->attr.sample_type & PERF_SAMPLE_DATA_SRC &&
ppmu->get_mem_data_src)
ppmu->get_mem_data_src(&data.data_src, ppmu->flags, regs);
if (perf_event_overflow(event, &data, regs))
power_pmu_stop(event, 0);
}

74
arch/powerpc/perf/isa207-common.c
View File

@ -148,6 +148,80 @@ static bool is_thresh_cmp_valid(u64 event)
return true;
}
static inline u64 isa207_find_source(u64 idx, u32 sub_idx)
{
u64 ret = PERF_MEM_NA;
switch(idx) {
case 0:
/* Nothing to do */
break;
case 1:
ret = PH(LVL, L1);
break;
case 2:
ret = PH(LVL, L2);
break;
case 3:
ret = PH(LVL, L3);
break;
case 4:
if (sub_idx <= 1)
ret = PH(LVL, LOC_RAM);
else if (sub_idx > 1 && sub_idx <= 2)
ret = PH(LVL, REM_RAM1);
else
ret = PH(LVL, REM_RAM2);
ret |= P(SNOOP, HIT);
break;
case 5:
ret = PH(LVL, REM_CCE1);
if ((sub_idx == 0) || (sub_idx == 2) || (sub_idx == 4))
ret |= P(SNOOP, HIT);
else if ((sub_idx == 1) || (sub_idx == 3) || (sub_idx == 5))
ret |= P(SNOOP, HITM);
break;
case 6:
ret = PH(LVL, REM_CCE2);
if ((sub_idx == 0) || (sub_idx == 2))
ret |= P(SNOOP, HIT);
else if ((sub_idx == 1) || (sub_idx == 3))
ret |= P(SNOOP, HITM);
break;
case 7:
ret = PM(LVL, L1);
break;
}
return ret;
}
void isa207_get_mem_data_src(union perf_mem_data_src *dsrc, u32 flags,
struct pt_regs *regs)
{
u64 idx;
u32 sub_idx;
u64 sier;
u64 val;
/* Skip if no SIER support */
if (!(flags & PPMU_HAS_SIER)) {
dsrc->val = 0;
return;
}
sier = mfspr(SPRN_SIER);
val = (sier & ISA207_SIER_TYPE_MASK) >> ISA207_SIER_TYPE_SHIFT;
if (val == 1 || val == 2) {
idx = (sier & ISA207_SIER_LDST_MASK) >> ISA207_SIER_LDST_SHIFT;
sub_idx = (sier & ISA207_SIER_DATA_SRC_MASK) >> ISA207_SIER_DATA_SRC_SHIFT;
dsrc->val = isa207_find_source(idx, sub_idx);
dsrc->val |= (val == 1) ? P(OP, LOAD) : P(OP, STORE);
}
}
int isa207_get_constraint(u64 event, unsigned long *maskp, unsigned long *valp)
{
unsigned int unit, pmc, cache, ebb;

16
arch/powerpc/perf/isa207-common.h
View File

@ -260,6 +260,19 @@
#define MAX_ALT 2
#define MAX_PMU_COUNTERS 6
#define ISA207_SIER_TYPE_SHIFT 15
#define ISA207_SIER_TYPE_MASK (0x7ull << ISA207_SIER_TYPE_SHIFT)
#define ISA207_SIER_LDST_SHIFT 1
#define ISA207_SIER_LDST_MASK (0x7ull << ISA207_SIER_LDST_SHIFT)
#define ISA207_SIER_DATA_SRC_SHIFT 53
#define ISA207_SIER_DATA_SRC_MASK (0x7ull << ISA207_SIER_DATA_SRC_SHIFT)
#define P(a, b) PERF_MEM_S(a, b)
#define PH(a, b) (P(LVL, HIT) | P(a, b))
#define PM(a, b) (P(LVL, MISS) | P(a, b))
int isa207_get_constraint(u64 event, unsigned long *maskp, unsigned long *valp);
int isa207_compute_mmcr(u64 event[], int n_ev,
unsigned int hwc[], unsigned long mmcr[],
@ -267,6 +280,7 @@ int isa207_compute_mmcr(u64 event[], int n_ev,
void isa207_disable_pmc(unsigned int pmc, unsigned long mmcr[]);
int isa207_get_alternatives(u64 event, u64 alt[],
const unsigned int ev_alt[][MAX_ALT], int size);
void isa207_get_mem_data_src(union perf_mem_data_src *dsrc, u32 flags,
struct pt_regs *regs);
#endif