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perf/x86/intel: Fix PEBS memory access info encoding for ADL 

The PEBS memory access latency encoding for the e-core is slightly
different from the p-core. The bit 4 is Lock, while the bit 5 is TLB
access.

Add a new flag to indicate the load/store latency event on a hybrid
platform.
Add a new function pointer to retrieve the latency data for a hybrid
platform. Only implement the new flag and function for the e-core on
ADL. Still use the existing PERF_X86_EVENT_PEBS_LDLAT/STLAT flag for the
p-core on ADL.

Factor out pebs_set_tlb_lock() to set the generic memory data source
information of the TLB access and lock for both load and store latency.

Move the intel_get_event_constraints() to ahead of the :ppp check,
otherwise the new flag never gets a chance to be set for the :ppp
events.

Fixes: f83d2f91d2 ("perf/x86/intel: Add Alder Lake Hybrid support")
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lkml.kernel.org/r/20220629150840.2235741-1-kan.liang@linux.intel.com
This commit is contained in:
Kan Liang 2022-06-29 08:08:39 -07:00 committed by Peter Zijlstra
parent 119a784c81
commit 39a41278f0
3 changed files with 60 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/x86/events/intel/core.c
View File

@ -4141,6 +4141,8 @@ tnt_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
{
struct event_constraint *c;
c = intel_get_event_constraints(cpuc, idx, event);
/*
* :ppp means to do reduced skid PEBS,
* which is available on PMC0 and fixed counter 0.
@ -4153,8 +4155,6 @@ tnt_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
return &counter0_constraint;
}
c = intel_get_event_constraints(cpuc, idx, event);
return c;
}
@ -6242,6 +6242,7 @@ __init int intel_pmu_init(void)
x86_pmu.flags |= PMU_FL_MEM_LOADS_AUX;
x86_pmu.lbr_pt_coexist = true;
intel_pmu_pebs_data_source_skl(false);
x86_pmu.pebs_latency_data = adl_latency_data_small;
x86_pmu.num_topdown_events = 8;
x86_pmu.update_topdown_event = adl_update_topdown_event;
x86_pmu.set_topdown_event_period = adl_set_topdown_event_period;

80
arch/x86/events/intel/ds.c
View File

@ -171,6 +171,49 @@ static u64 precise_datala_hsw(struct perf_event *event, u64 status)
return dse.val;
}
static inline void pebs_set_tlb_lock(u64 *val, bool tlb, bool lock)
{
/*
* TLB access
* 0 = did not miss 2nd level TLB
* 1 = missed 2nd level TLB
*/
if (tlb)
*val |= P(TLB, MISS) | P(TLB, L2);
else
*val |= P(TLB, HIT) | P(TLB, L1) | P(TLB, L2);
/* locked prefix */
if (lock)
*val |= P(LOCK, LOCKED);
}
/* Retrieve the latency data for e-core of ADL */
u64 adl_latency_data_small(struct perf_event *event, u64 status)
{
union intel_x86_pebs_dse dse;
u64 val;
WARN_ON_ONCE(hybrid_pmu(event->pmu)->cpu_type == hybrid_big);
dse.val = status;
val = pebs_data_source[dse.ld_dse];
/*
* For the atom core on ADL,
* bit 4: lock, bit 5: TLB access.
*/
pebs_set_tlb_lock(&val, dse.ld_locked, dse.ld_stlb_miss);
if (dse.ld_data_blk)
val |= P(BLK, DATA);
else
val |= P(BLK, NA);
return val;
}
static u64 load_latency_data(u64 status)
{
union intel_x86_pebs_dse dse;
@ -190,21 +233,8 @@ static u64 load_latency_data(u64 status)
val |= P(TLB, NA) | P(LOCK, NA);
return val;
}
/*
* bit 4: TLB access
* 0 = did not miss 2nd level TLB
* 1 = missed 2nd level TLB
*/
if (dse.ld_stlb_miss)
val |= P(TLB, MISS) | P(TLB, L2);
else
val |= P(TLB, HIT) | P(TLB, L1) | P(TLB, L2);
/*
* bit 5: locked prefix
*/
if (dse.ld_locked)
val |= P(LOCK, LOCKED);
pebs_set_tlb_lock(&val, dse.ld_stlb_miss, dse.ld_locked);
/*
* Ice Lake and earlier models do not support block infos.
@ -245,21 +275,7 @@ static u64 store_latency_data(u64 status)
*/
val = pebs_data_source[dse.st_lat_dse];
/*
* bit 4: TLB access
* 0 = did not miss 2nd level TLB
* 1 = missed 2nd level TLB
*/
if (dse.st_lat_stlb_miss)
val |= P(TLB, MISS) | P(TLB, L2);
else
val |= P(TLB, HIT) | P(TLB, L1) | P(TLB, L2);
/*
* bit 5: locked prefix
*/
if (dse.st_lat_locked)
val |= P(LOCK, LOCKED);
pebs_set_tlb_lock(&val, dse.st_lat_stlb_miss, dse.st_lat_locked);
val |= P(BLK, NA);
@ -781,8 +797,8 @@ struct event_constraint intel_glm_pebs_event_constraints[] = {
struct event_constraint intel_grt_pebs_event_constraints[] = {
/* Allow all events as PEBS with no flags */
INTEL_PLD_CONSTRAINT(0x5d0, 0xf),
INTEL_PSD_CONSTRAINT(0x6d0, 0xf),
INTEL_HYBRID_LAT_CONSTRAINT(0x5d0, 0xf),
INTEL_HYBRID_LAT_CONSTRAINT(0x6d0, 0xf),
EVENT_CONSTRAINT_END
};
@ -1446,6 +1462,8 @@ static u64 get_data_src(struct perf_event *event, u64 aux)
val = load_latency_data(aux);
else if (fl & PERF_X86_EVENT_PEBS_STLAT)
val = store_latency_data(aux);
else if (fl & PERF_X86_EVENT_PEBS_LAT_HYBRID)
val = x86_pmu.pebs_latency_data(event, aux);
else if (fst && (fl & PERF_X86_EVENT_PEBS_HSW_PREC))
val = precise_datala_hsw(event, aux);
else if (fst)

8
arch/x86/events/perf_event.h
View File

@ -84,6 +84,7 @@ static inline bool constraint_match(struct event_constraint *c, u64 ecode)
#define PERF_X86_EVENT_TOPDOWN 0x04000 /* Count Topdown slots/metrics events */
#define PERF_X86_EVENT_PEBS_STLAT 0x08000 /* st+stlat data address sampling */
#define PERF_X86_EVENT_AMD_BRS 0x10000 /* AMD Branch Sampling */
#define PERF_X86_EVENT_PEBS_LAT_HYBRID 0x20000 /* ld and st lat for hybrid */
static inline bool is_topdown_count(struct perf_event *event)
{
@ -461,6 +462,10 @@ struct cpu_hw_events {
__EVENT_CONSTRAINT(c, n, INTEL_ARCH_EVENT_MASK|X86_ALL_EVENT_FLAGS, \
HWEIGHT(n), 0, PERF_X86_EVENT_PEBS_ST)
#define INTEL_HYBRID_LAT_CONSTRAINT(c, n) \
__EVENT_CONSTRAINT(c, n, INTEL_ARCH_EVENT_MASK|X86_ALL_EVENT_FLAGS, \
HWEIGHT(n), 0, PERF_X86_EVENT_PEBS_LAT_HYBRID)
/* Event constraint, but match on all event flags too. */
#define INTEL_FLAGS_EVENT_CONSTRAINT(c, n) \
EVENT_CONSTRAINT(c, n, ARCH_PERFMON_EVENTSEL_EVENT|X86_ALL_EVENT_FLAGS)
@ -826,6 +831,7 @@ struct x86_pmu {
void (*drain_pebs)(struct pt_regs *regs, struct perf_sample_data *data);
struct event_constraint *pebs_constraints;
void (*pebs_aliases)(struct perf_event *event);
u64 (*pebs_latency_data)(struct perf_event *event, u64 status);
unsigned long large_pebs_flags;
u64 rtm_abort_event;
@ -1393,6 +1399,8 @@ void intel_pmu_disable_bts(void);
int intel_pmu_drain_bts_buffer(void);
u64 adl_latency_data_small(struct perf_event *event, u64 status);
extern struct event_constraint intel_core2_pebs_event_constraints[];
extern struct event_constraint intel_atom_pebs_event_constraints[];