perf/core: Add a 'flags' parameter to the PMU transactional interfaces

[firefly-linux-kernel-4.4.55.git] / arch / powerpc / perf / core-book3s.c

diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index b0382f3f1095589a599c92d1a6eb25904a988304..c84074185c80b53eb868e47a27b386feab3b8df1 100644 (file)
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -49,6 +49,7 @@ struct cpu_hw_events {
        unsigned long avalues[MAX_HWEVENTS][MAX_EVENT_ALTERNATIVES];
 
        unsigned int group_flag;
+       unsigned int txn_flags;
        int n_txn_start;
 
        /* BHRB bits */
@@ -1586,11 +1587,21 @@ static void power_pmu_stop(struct perf_event *event, int ef_flags)
  * Start group events scheduling transaction
  * Set the flag to make pmu::enable() not perform the
  * schedulability test, it will be performed at commit time
+ *
+ * We only support PERF_PMU_TXN_ADD transactions. Save the
+ * transaction flags but otherwise ignore non-PERF_PMU_TXN_ADD
+ * transactions.
  */
-static void power_pmu_start_txn(struct pmu *pmu)
+static void power_pmu_start_txn(struct pmu *pmu, unsigned int txn_flags)
 {
        struct cpu_hw_events *cpuhw = this_cpu_ptr(&cpu_hw_events);
 
+       WARN_ON_ONCE(cpuhw->txn_flags);         /* txn already in flight */
+
+       cpuhw->txn_flags = txn_flags;
+       if (txn_flags & ~PERF_PMU_TXN_ADD)
+               return;
+
        perf_pmu_disable(pmu);
        cpuhw->group_flag |= PERF_EVENT_TXN;
        cpuhw->n_txn_start = cpuhw->n_events;
@@ -1604,6 +1615,14 @@ static void power_pmu_start_txn(struct pmu *pmu)
 static void power_pmu_cancel_txn(struct pmu *pmu)
 {
        struct cpu_hw_events *cpuhw = this_cpu_ptr(&cpu_hw_events);
+       unsigned int txn_flags;
+
+       WARN_ON_ONCE(!cpuhw->txn_flags);        /* no txn in flight */
+
+       txn_flags = cpuhw->txn_flags;
+       cpuhw->txn_flags = 0;
+       if (txn_flags & ~PERF_PMU_TXN_ADD)
+               return;
 
        cpuhw->group_flag &= ~PERF_EVENT_TXN;
        perf_pmu_enable(pmu);
@@ -1621,7 +1640,15 @@ static int power_pmu_commit_txn(struct pmu *pmu)
 
        if (!ppmu)
                return -EAGAIN;
+
        cpuhw = this_cpu_ptr(&cpu_hw_events);
+       WARN_ON_ONCE(!cpuhw->txn_flags);        /* no txn in flight */
+
+       if (cpuhw->txn_flags & ~PERF_PMU_TXN_ADD) {
+               cpuhw->txn_flags = 0;
+               return 0;
+       }
+
        n = cpuhw->n_events;
        if (check_excludes(cpuhw->event, cpuhw->flags, 0, n))
                return -EAGAIN;
@@ -1633,6 +1660,7 @@ static int power_pmu_commit_txn(struct pmu *pmu)
                cpuhw->event[i]->hw.config = cpuhw->events[i];
 
        cpuhw->group_flag &= ~PERF_EVENT_TXN;
+       cpuhw->txn_flags = 0;
        perf_pmu_enable(pmu);
        return 0;
 }