[kvm-unit-tests RFC 07/10] arm: pmu: test 32-bit <-> 64-bit transitions

[Eric Auger <eric.auger@redhat.com>]

---
 arm/pmu.c         | 125 +++++++++++++++++++++++++++++++++++++++++++++-
 arm/unittests.cfg |   6 +++
 2 files changed, 130 insertions(+), 1 deletion(-)

diff --git a/arm/pmu.c b/arm/pmu.c
index e185809..47d46a2 100644
--- a/arm/pmu.c
+++ b/arm/pmu.c
@@ -116,6 +116,7 @@ static void test_basic_event_count(void) {}
 static void test_mem_access(void) {}
 static void test_chained_counters(void) {}
 static void test_chained_sw_incr(void) {}
+static void test_chain_promotion(void) {}
 
 #elif defined(__aarch64__)
 #define ID_AA64DFR0_PERFMON_SHIFT 8
@@ -262,7 +263,6 @@ asm volatile(
 	: );
 }
 
-
 static void pmu_reset(void)
 {
 	/* reset all counters, counting disabled at PMCR level*/
@@ -571,6 +571,126 @@ static void test_chained_sw_incr(void)
 		    read_regn(pmevcntr, 0), read_regn(pmevcntr, 1));
 }
 
+static void test_chain_promotion(void)
+{
+	uint32_t events[] = { 0x13 /* MEM_ACCESS */, 0x1E /* CHAIN */};
+	void *addr = malloc(PAGE_SIZE);
+
+	if (!satisfy_prerequisites(events, ARRAY_SIZE(events)))
+		return;
+
+	/* Only enable CHAIN counter */
+	pmu_reset();
+        write_regn(pmevtyper, 0, events[0] | PMEVTYPER_EXCLUDE_EL0);
+        write_regn(pmevtyper, 1, events[1] | PMEVTYPER_EXCLUDE_EL0);
+	write_sysreg_s(0x2, PMCNTENSET_EL0);
+	isb();
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report("chain counter not counting if even counter is disabled",
+		!read_regn(pmevcntr, 0));
+
+	/* Only enable even counter */
+	pmu_reset();
+	write_regn(pmevcntr, 0, 0xFFFFFFF0);
+	write_sysreg_s(0x1, PMCNTENSET_EL0);
+	isb();
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report("odd counter did not increment on overflow if disabled",
+		!read_regn(pmevcntr, 1) && (read_sysreg(pmovsclr_el0) == 0x1));
+	report_info("MEM_ACCESS counter #0 has value %ld", read_regn(pmevcntr, 0)); 
+	report_info("CHAIN counter #1 has value %ld", read_regn(pmevcntr, 1)); 
+	report_info("overflow counter %ld", read_sysreg(pmovsclr_el0));
+
+	/* start at 0xFFFFFFDC, +20 with CHAIN enabled, +20 with CHAIN disabled */
+	pmu_reset();
+	write_sysreg_s(0x3, PMCNTENSET_EL0);
+	write_regn(pmevcntr, 0, 0xFFFFFFDC);
+	isb();
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report_info("MEM_ACCESS counter #0 has value 0x%lx", read_regn(pmevcntr, 0)); 
+
+	/* disable the CHAIN event */
+	write_sysreg_s(0x2, PMCNTENCLR_EL0);
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report_info("MEM_ACCESS counter #0 has value 0x%lx", read_regn(pmevcntr, 0)); 
+	report("should have triggered an overflow on #0", read_sysreg(pmovsclr_el0) == 0x1);
+	report("CHAIN counter #1 shouldn't have incremented", !read_regn(pmevcntr, 1));
+
+	/* start at 0xFFFFFFDC, +20 with CHAIN disabled, +20 with CHAIN enabled */
+
+	pmu_reset();
+	write_sysreg_s(0x1, PMCNTENSET_EL0);
+	write_regn(pmevcntr, 0, 0xFFFFFFDC);
+	isb();
+	report_info("counter #0 = 0x%lx, counter #1 = 0x%lx overflow=0x%lx",
+		    read_regn(pmevcntr, 0), read_regn(pmevcntr, 1),
+		    read_sysreg(pmovsclr_el0));
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report_info("MEM_ACCESS counter #0 has value 0x%lx", read_regn(pmevcntr, 0)); 
+
+	/* enable the CHAIN event */
+	write_sysreg_s(0x3, PMCNTENSET_EL0);
+	isb();
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report_info("MEM_ACCESS counter #0 has value 0x%lx", read_regn(pmevcntr, 0)); 
+
+	report("CHAIN counter #1 should have incremented and no overflow expected",
+		(read_regn(pmevcntr, 1) == 1) && !read_sysreg(pmovsclr_el0));
+
+	report_info("CHAIN counter #1 = 0x%lx, overflow=0x%lx",
+		read_regn(pmevcntr, 1), read_sysreg(pmovsclr_el0));
+
+	/* start as MEM_ACCESS/CPU_CYCLES and move to CHAIN/MEM_ACCESS */
+	pmu_reset();
+        write_regn(pmevtyper, 0, 0x13 /* MEM_ACCESS */ | PMEVTYPER_EXCLUDE_EL0);
+        write_regn(pmevtyper, 1, 0x11 /* CPU_CYCLES */ | PMEVTYPER_EXCLUDE_EL0);
+	write_sysreg_s(0x3, PMCNTENSET_EL0);
+	write_regn(pmevcntr, 0, 0xFFFFFFDC);
+	isb();
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report_info("MEM_ACCESS counter #0 has value 0x%lx", read_regn(pmevcntr, 0)); 
+
+	/* 0 becomes CHAINED */
+	write_sysreg_s(0x0, PMCNTENSET_EL0);
+        write_regn(pmevtyper, 1, 0x1E /* CHAIN */ | PMEVTYPER_EXCLUDE_EL0);
+	write_sysreg_s(0x3, PMCNTENSET_EL0);
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report_info("MEM_ACCESS counter #0 has value 0x%lx", read_regn(pmevcntr, 0)); 
+
+	report("CHAIN counter #1 should have incremented and no overflow expected",
+		(read_regn(pmevcntr, 1) == 1) && !read_sysreg(pmovsclr_el0));
+
+	report_info("CHAIN counter #1 = 0x%lx, overflow=0x%lx",
+		read_regn(pmevcntr, 1), read_sysreg(pmovsclr_el0));
+
+	/* start as CHAIN/MEM_ACCESS and move to MEM_ACCESS/CPU_CYCLES */
+	pmu_reset();
+        write_regn(pmevtyper, 0, 0x13 /* MEM_ACCESS */ | PMEVTYPER_EXCLUDE_EL0);
+        write_regn(pmevtyper, 1, 0x1E /* CHAIN */ | PMEVTYPER_EXCLUDE_EL0);
+	write_regn(pmevcntr, 0, 0xFFFFFFDC);
+	write_sysreg_s(0x3, PMCNTENSET_EL0);
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report_info("counter #0=0x%lx, counter #1=0x%lx",
+			read_regn(pmevcntr, 0), read_regn(pmevcntr, 1));
+
+	write_sysreg_s(0x0, PMCNTENSET_EL0);
+        write_regn(pmevtyper, 1, 0x11 /* CPU_CYCLES */ | PMEVTYPER_EXCLUDE_EL0);
+	write_sysreg_s(0x3, PMCNTENSET_EL0);
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report("overflow is expected on counter 0", read_sysreg(pmovsclr_el0) == 1);
+	report_info("counter #0=0x%lx, counter #1=0x%lx overflow=0x%lx",
+			read_regn(pmevcntr, 0), read_regn(pmevcntr, 1),
+			read_sysreg(pmovsclr_el0));
+}
+
 #endif
 
 /*
@@ -773,6 +893,9 @@ int main(int argc, char *argv[])
 	} else if (strcmp(argv[1], "chained-sw-incr") == 0) {
 		report_prefix_push(argv[1]);
 		test_chained_sw_incr();
+	} else if (strcmp(argv[1], "chain-promotion") == 0) {
+		report_prefix_push(argv[1]);
+		test_chain_promotion();
 	} else {
 		report_abort("Unknown subtest '%s'", argv[1]);
 	}
diff --git a/arm/unittests.cfg b/arm/unittests.cfg
index 1bd4319..eb6e87e 100644
--- a/arm/unittests.cfg
+++ b/arm/unittests.cfg
@@ -102,6 +102,12 @@ groups = pmu
 arch = arm64
 extra_params = -append 'chained-sw-incr'
 
+[pmu-chain-promotion]
+file = pmu.flat
+groups = pmu
+arch = arm64
+extra_params = -append 'chain-promotion'
+
 # Test PMU support (TCG) with -icount IPC=1
 #[pmu-tcg-icount-1]
 #file = pmu.flat
-- 
2.20.1