[PATCH v6 20/21] TEST(do-not-upstream): fake qemu-virt PMU events for cdeleg counter-mask testing

[Atish Patra]

From: Atish Patra <atishp at meta.com>

Adds fake-any/fake-ctr3/fake-ctr34 (event codes 0xF0x QEMU doesn't model) with
counterid_masks, to exercise the counter-delegation allocation + counter-mask
constraint in QEMU (events read 0 = allocated/programmed, vs 'not supported').

Signed-off-by: Atish Patra <atishp at meta.com>
---
 drivers/perf/riscv_pmu_sbi.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
index 74acac54328e..3c0829c0a42a 100644
--- a/drivers/perf/riscv_pmu_sbi.c
+++ b/drivers/perf/riscv_pmu_sbi.c
@@ -476,6 +476,12 @@ RVPMU_EVENT_CMASK_ATTR(instructions, instructions, 0x02, 0xFFFFFFF8);
 RVPMU_EVENT_CMASK_ATTR(dTLB-load-misses, dTLB_load_miss, 0x10019, 0xFFFFFFF8);
 RVPMU_EVENT_CMASK_ATTR(dTLB-store-misses, dTLB_store_miss, 0x1001B, 0xFFFFFFF8);
 RVPMU_EVENT_CMASK_ATTR(iTLB-load-misses, iTLB_load_miss, 0x10021, 0xFFFFFFF8);
+/*
+ * FAKE events for cdeleg mechanism testing: event codes QEMU does NOT model.
+ */
+RVPMU_EVENT_CMASK_ATTR(fake-any, fake_any, 0xF00, 0xFFFFFFF8);
+RVPMU_EVENT_CMASK_ATTR(fake-ctr3, fake_ctr3, 0xF01, 0x8);
+RVPMU_EVENT_CMASK_ATTR(fake-ctr34, fake_ctr34, 0xF02, 0x18);
 
 static struct attribute *qemu_virt_event_group[] = {
 	RVPMU_EVENT_ATTR_PTR(cycles),
@@ -483,6 +489,9 @@ static struct attribute *qemu_virt_event_group[] = {
 	RVPMU_EVENT_ATTR_PTR(dTLB_load_miss),
 	RVPMU_EVENT_ATTR_PTR(dTLB_store_miss),
 	RVPMU_EVENT_ATTR_PTR(iTLB_load_miss),
+	RVPMU_EVENT_ATTR_PTR(fake_any),
+	RVPMU_EVENT_ATTR_PTR(fake_ctr3),
+	RVPMU_EVENT_ATTR_PTR(fake_ctr34),
 	NULL,
 };
 

-- 
2.53.0-Meta