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perf_events, x86: Fixup fixed counter constraints
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Patch 1da53e0 ("perf_events, x86: Improve x86 event scheduling")
lost us one of the fixed purpose counters and then ed8777f
("perf_events, x86: Fix event constraint masks") broke it even
further.

Widen the fixed event mask to event+umask and specify the full config
for each of the 3 fixed purpose counters. Then let the init code fill
out the placement for the GP regs based on the cpuid info.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Peter Zijlstra authored and Ingo Molnar committed Mar 2, 2010
1 parent 320ebf0 commit b622d64
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Showing 3 changed files with 40 additions and 18 deletions.
2 changes: 1 addition & 1 deletion arch/x86/include/asm/perf_event.h
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,7 @@
INTEL_ARCH_INV_MASK| \
INTEL_ARCH_EDGE_MASK|\
INTEL_ARCH_UNIT_MASK|\
INTEL_ARCH_EVTSEL_MASK)
INTEL_ARCH_EVENT_MASK)

#define ARCH_PERFMON_UNHALTED_CORE_CYCLES_SEL 0x3c
#define ARCH_PERFMON_UNHALTED_CORE_CYCLES_UMASK (0x00 << 8)
Expand Down
25 changes: 18 additions & 7 deletions arch/x86/kernel/cpu/perf_event.c
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Original file line number Diff line number Diff line change
Expand Up @@ -73,10 +73,10 @@ struct debug_store {
struct event_constraint {
union {
unsigned long idxmsk[BITS_TO_LONGS(X86_PMC_IDX_MAX)];
u64 idxmsk64[1];
u64 idxmsk64;
};
int code;
int cmask;
u64 code;
u64 cmask;
int weight;
};

Expand All @@ -103,7 +103,7 @@ struct cpu_hw_events {
};

#define __EVENT_CONSTRAINT(c, n, m, w) {\
{ .idxmsk64[0] = (n) }, \
{ .idxmsk64 = (n) }, \
.code = (c), \
.cmask = (m), \
.weight = (w), \
Expand All @@ -116,7 +116,7 @@ struct cpu_hw_events {
EVENT_CONSTRAINT(c, n, INTEL_ARCH_EVTSEL_MASK)

#define FIXED_EVENT_CONSTRAINT(c, n) \
EVENT_CONSTRAINT(c, n, INTEL_ARCH_FIXED_MASK)
EVENT_CONSTRAINT(c, (1ULL << (32+n)), INTEL_ARCH_FIXED_MASK)

#define EVENT_CONSTRAINT_END \
EVENT_CONSTRAINT(0, 0, 0)
Expand Down Expand Up @@ -615,8 +615,8 @@ static int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign)
bitmap_zero(used_mask, X86_PMC_IDX_MAX);

for (i = 0; i < n; i++) {
constraints[i] =
x86_pmu.get_event_constraints(cpuc, cpuc->event_list[i]);
c = x86_pmu.get_event_constraints(cpuc, cpuc->event_list[i]);
constraints[i] = c;
}

/*
Expand Down Expand Up @@ -1350,6 +1350,7 @@ static void __init pmu_check_apic(void)

void __init init_hw_perf_events(void)
{
struct event_constraint *c;
int err;

pr_info("Performance Events: ");
Expand Down Expand Up @@ -1398,6 +1399,16 @@ void __init init_hw_perf_events(void)
__EVENT_CONSTRAINT(0, (1ULL << x86_pmu.num_events) - 1,
0, x86_pmu.num_events);

if (x86_pmu.event_constraints) {
for_each_event_constraint(c, x86_pmu.event_constraints) {
if (c->cmask != INTEL_ARCH_FIXED_MASK)
continue;

c->idxmsk64 |= (1ULL << x86_pmu.num_events) - 1;
c->weight += x86_pmu.num_events;
}
}

pr_info("... version: %d\n", x86_pmu.version);
pr_info("... bit width: %d\n", x86_pmu.event_bits);
pr_info("... generic registers: %d\n", x86_pmu.num_events);
Expand Down
31 changes: 21 additions & 10 deletions arch/x86/kernel/cpu/perf_event_intel.c
View file
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
#ifdef CONFIG_CPU_SUP_INTEL

/*
* Intel PerfMon v3. Used on Core2 and later.
* Intel PerfMon, used on Core and later.
*/
static const u64 intel_perfmon_event_map[] =
{
Expand All @@ -27,8 +27,14 @@ static struct event_constraint intel_core_event_constraints[] =

static struct event_constraint intel_core2_event_constraints[] =
{
FIXED_EVENT_CONSTRAINT(0xc0, (0x3|(1ULL<<32))), /* INSTRUCTIONS_RETIRED */
FIXED_EVENT_CONSTRAINT(0x3c, (0x3|(1ULL<<33))), /* UNHALTED_CORE_CYCLES */
FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
/*
* Core2 has Fixed Counter 2 listed as CPU_CLK_UNHALTED.REF and event
* 0x013c as CPU_CLK_UNHALTED.BUS and specifies there is a fixed
* ratio between these counters.
*/
/* FIXED_EVENT_CONSTRAINT(0x013c, 2), CPU_CLK_UNHALTED.REF */
INTEL_EVENT_CONSTRAINT(0x10, 0x1), /* FP_COMP_OPS_EXE */
INTEL_EVENT_CONSTRAINT(0x11, 0x2), /* FP_ASSIST */
INTEL_EVENT_CONSTRAINT(0x12, 0x2), /* MUL */
Expand All @@ -37,14 +43,16 @@ static struct event_constraint intel_core2_event_constraints[] =
INTEL_EVENT_CONSTRAINT(0x18, 0x1), /* IDLE_DURING_DIV */
INTEL_EVENT_CONSTRAINT(0x19, 0x2), /* DELAYED_BYPASS */
INTEL_EVENT_CONSTRAINT(0xa1, 0x1), /* RS_UOPS_DISPATCH_CYCLES */
INTEL_EVENT_CONSTRAINT(0xc9, 0x1), /* ITLB_MISS_RETIRED (T30-9) */
INTEL_EVENT_CONSTRAINT(0xcb, 0x1), /* MEM_LOAD_RETIRED */
EVENT_CONSTRAINT_END
};

static struct event_constraint intel_nehalem_event_constraints[] =
{
FIXED_EVENT_CONSTRAINT(0xc0, (0xf|(1ULL<<32))), /* INSTRUCTIONS_RETIRED */
FIXED_EVENT_CONSTRAINT(0x3c, (0xf|(1ULL<<33))), /* UNHALTED_CORE_CYCLES */
FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
/* FIXED_EVENT_CONSTRAINT(0x013c, 2), CPU_CLK_UNHALTED.REF */
INTEL_EVENT_CONSTRAINT(0x40, 0x3), /* L1D_CACHE_LD */
INTEL_EVENT_CONSTRAINT(0x41, 0x3), /* L1D_CACHE_ST */
INTEL_EVENT_CONSTRAINT(0x42, 0x3), /* L1D_CACHE_LOCK */
Expand All @@ -58,8 +66,9 @@ static struct event_constraint intel_nehalem_event_constraints[] =

static struct event_constraint intel_westmere_event_constraints[] =
{
FIXED_EVENT_CONSTRAINT(0xc0, (0xf|(1ULL<<32))), /* INSTRUCTIONS_RETIRED */
FIXED_EVENT_CONSTRAINT(0x3c, (0xf|(1ULL<<33))), /* UNHALTED_CORE_CYCLES */
FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
/* FIXED_EVENT_CONSTRAINT(0x013c, 2), CPU_CLK_UNHALTED.REF */
INTEL_EVENT_CONSTRAINT(0x51, 0x3), /* L1D */
INTEL_EVENT_CONSTRAINT(0x60, 0x1), /* OFFCORE_REQUESTS_OUTSTANDING */
INTEL_EVENT_CONSTRAINT(0x63, 0x3), /* CACHE_LOCK_CYCLES */
Expand All @@ -68,8 +77,9 @@ static struct event_constraint intel_westmere_event_constraints[] =

static struct event_constraint intel_gen_event_constraints[] =
{
FIXED_EVENT_CONSTRAINT(0xc0, (0x3|(1ULL<<32))), /* INSTRUCTIONS_RETIRED */
FIXED_EVENT_CONSTRAINT(0x3c, (0x3|(1ULL<<33))), /* UNHALTED_CORE_CYCLES */
FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
/* FIXED_EVENT_CONSTRAINT(0x013c, 2), CPU_CLK_UNHALTED.REF */
EVENT_CONSTRAINT_END
};

Expand Down Expand Up @@ -935,7 +945,7 @@ static __init int intel_pmu_init(void)
x86_pmu.event_constraints = intel_nehalem_event_constraints;
pr_cont("Nehalem/Corei7 events, ");
break;
case 28:
case 28: /* Atom */
memcpy(hw_cache_event_ids, atom_hw_cache_event_ids,
sizeof(hw_cache_event_ids));

Expand All @@ -951,6 +961,7 @@ static __init int intel_pmu_init(void)
x86_pmu.event_constraints = intel_westmere_event_constraints;
pr_cont("Westmere events, ");
break;

default:
/*
* default constraints for v2 and up
Expand Down

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