perfmon: Test overflow in cpu test.

Adds perfmon_event_write as a test-only API.

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/x86/machine/pmu_intel.c b/arch/x86/machine/pmu_intel.c
index 6439282..40e1450 100644
--- a/arch/x86/machine/pmu_intel.c
+++ b/arch/x86/machine/pmu_intel.c
@@ -231,6 +231,21 @@ pmu_intel_read(unsigned int pmc_id)
     return cpu_get_msr64(PMU_INTEL_MSR_PMC0 + pmc_id);
 }
 
+#ifdef CONFIG_PERFMON_TEST
+
+static void
+pmu_intel_write(unsigned int pmc_id, uint64_t value)
+{
+    uint32_t low, high;
+
+    low = value  & 0xffffffff;
+    high = value >> 32;
+
+    cpu_set_msr(PMU_INTEL_MSR_PMC0 + pmc_id, low, high);
+}
+
+#endif /* CONFIG_PERFMON_TEST */
+
 static void
 pmu_intel_handle_of_intr_v1(struct trap_frame *frame)
 {
@@ -318,6 +333,9 @@ pmu_intel_setup(void)
     pmu_driver.read = pmu_intel_read;
     pmu_driver.get_pmc_width = pmu_intel_get_pmc_width;
     pmu_driver.handle_of_intr = pmu_intel_handle_of_intr_v1;
+#ifdef CONFIG_PERFMON_TEST
+    pmu_driver.write = pmu_intel_write;
+#endif
 
     return perfmon_pmu_register(&pmu_driver);
 }