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perf/x86: Add flags to event constraints
This patch adds a flags field to each event constraint. It can be used to store event specific features which can then later be used by scheduling code or low-level x86 code. The flags are propagated into event->hw.flags during the get_event_constraint() call. They are cleared during the put_event_constraint() call. This mechanism is going to be used by the PEBS-LL patches. It avoids defining yet another table to hold event specific information. Signed-off-by: Stephane Eranian <eranian@google.com> Cc: peterz@infradead.org Cc: ak@linux.intel.com Cc: jolsa@redhat.com Cc: namhyung.kim@lge.com Link: http://lkml.kernel.org/r/1359040242-8269-4-git-send-email-eranian@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -1489,7 +1489,7 @@ static int __init init_hw_perf_events(void)
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unconstrained = (struct event_constraint)
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__EVENT_CONSTRAINT(0, (1ULL << x86_pmu.num_counters) - 1,
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0, x86_pmu.num_counters, 0);
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0, x86_pmu.num_counters, 0, 0);
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x86_pmu.attr_rdpmc = 1; /* enable userspace RDPMC usage by default */
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x86_pmu_format_group.attrs = x86_pmu.format_attrs;
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@ -59,6 +59,7 @@ struct event_constraint {
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u64 cmask;
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int weight;
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int overlap;
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int flags;
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};
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struct amd_nb {
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@ -170,16 +171,17 @@ struct cpu_hw_events {
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void *kfree_on_online;
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};
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#define __EVENT_CONSTRAINT(c, n, m, w, o) {\
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#define __EVENT_CONSTRAINT(c, n, m, w, o, f) {\
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{ .idxmsk64 = (n) }, \
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.code = (c), \
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.cmask = (m), \
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.weight = (w), \
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.overlap = (o), \
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.flags = f, \
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}
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#define EVENT_CONSTRAINT(c, n, m) \
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__EVENT_CONSTRAINT(c, n, m, HWEIGHT(n), 0)
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__EVENT_CONSTRAINT(c, n, m, HWEIGHT(n), 0, 0)
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/*
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* The overlap flag marks event constraints with overlapping counter
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@ -203,7 +205,7 @@ struct cpu_hw_events {
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* and its counter masks must be kept at a minimum.
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*/
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#define EVENT_CONSTRAINT_OVERLAP(c, n, m) \
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__EVENT_CONSTRAINT(c, n, m, HWEIGHT(n), 1)
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__EVENT_CONSTRAINT(c, n, m, HWEIGHT(n), 1, 0)
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/*
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* Constraint on the Event code.
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@ -1392,8 +1392,11 @@ x86_get_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event)
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if (x86_pmu.event_constraints) {
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for_each_event_constraint(c, x86_pmu.event_constraints) {
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if ((event->hw.config & c->cmask) == c->code)
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if ((event->hw.config & c->cmask) == c->code) {
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/* hw.flags zeroed at initialization */
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event->hw.flags |= c->flags;
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return c;
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}
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}
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}
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@ -1438,6 +1441,7 @@ intel_put_shared_regs_event_constraints(struct cpu_hw_events *cpuc,
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static void intel_put_event_constraints(struct cpu_hw_events *cpuc,
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struct perf_event *event)
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{
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event->hw.flags = 0;
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intel_put_shared_regs_event_constraints(cpuc, event);
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}
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@ -430,8 +430,10 @@ struct event_constraint *intel_pebs_constraints(struct perf_event *event)
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if (x86_pmu.pebs_constraints) {
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for_each_event_constraint(c, x86_pmu.pebs_constraints) {
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if ((event->hw.config & c->cmask) == c->code)
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if ((event->hw.config & c->cmask) == c->code) {
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event->hw.flags |= c->flags;
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return c;
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}
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}
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}
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@ -2438,7 +2438,7 @@ static int __init uncore_type_init(struct intel_uncore_type *type)
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type->unconstrainted = (struct event_constraint)
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__EVENT_CONSTRAINT(0, (1ULL << type->num_counters) - 1,
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0, type->num_counters, 0);
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0, type->num_counters, 0, 0);
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for (i = 0; i < type->num_boxes; i++) {
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pmus[i].func_id = -1;
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@ -127,6 +127,7 @@ struct hw_perf_event {
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int event_base_rdpmc;
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int idx;
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int last_cpu;
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int flags;
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struct hw_perf_event_extra extra_reg;
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struct hw_perf_event_extra branch_reg;
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