[PULL kvm-unit-tests 24/39] arm: pmu: test 32-bit <-> 64-bit transitions

[Andrew Jones <drjones@redhat.com>]

From: Eric Auger <eric.auger@redhat.com>

Test configurations where we transit from 32b to 64b
counters and conversely. Also tests configuration where
chain counters are configured but only one counter is
enabled.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
---
 arm/pmu.c         | 138 ++++++++++++++++++++++++++++++++++++++++++++++
 arm/unittests.cfg |   6 ++
 2 files changed, 144 insertions(+)

diff --git a/arm/pmu.c b/arm/pmu.c
index 73e55498284d..9602e70f4185 100644
--- a/arm/pmu.c
+++ b/arm/pmu.c
@@ -57,6 +57,7 @@
 #define ALL_SET			0xFFFFFFFF
 #define ALL_CLEAR		0x0
 #define PRE_OVERFLOW		0xFFFFFFF0
+#define PRE_OVERFLOW2		0xFFFFFFDC
 
 struct pmu {
 	unsigned int version;
@@ -144,6 +145,7 @@ static void test_mem_access(void) {}
 static void test_sw_incr(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
@@ -594,6 +596,138 @@ static void test_chained_sw_incr(void)
 		    read_regn_el0(pmevcntr, 0), read_regn_el0(pmevcntr, 1));
 }
 
+static void test_chain_promotion(void)
+{
+	uint32_t events[] = {MEM_ACCESS, CHAIN};
+	void *addr = malloc(PAGE_SIZE);
+
+	if (!satisfy_prerequisites(events, ARRAY_SIZE(events)))
+		return;
+
+	/* Only enable CHAIN counter */
+	pmu_reset();
+	write_regn_el0(pmevtyper, 0, MEM_ACCESS | PMEVTYPER_EXCLUDE_EL0);
+	write_regn_el0(pmevtyper, 1, CHAIN | PMEVTYPER_EXCLUDE_EL0);
+	write_sysreg_s(0x2, PMCNTENSET_EL0);
+	isb();
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report(!read_regn_el0(pmevcntr, 0),
+		"chain counter not counting if even counter is disabled");
+
+	/* Only enable even counter */
+	pmu_reset();
+	write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
+	write_sysreg_s(0x1, PMCNTENSET_EL0);
+	isb();
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report(!read_regn_el0(pmevcntr, 1) && (read_sysreg(pmovsclr_el0) == 0x1),
+		"odd counter did not increment on overflow if disabled");
+	report_info("MEM_ACCESS counter #0 has value %ld",
+		    read_regn_el0(pmevcntr, 0));
+	report_info("CHAIN counter #1 has value %ld",
+		    read_regn_el0(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_el0(pmevcntr, 0, PRE_OVERFLOW2);
+	isb();
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report_info("MEM_ACCESS counter #0 has value 0x%lx",
+		    read_regn_el0(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_el0(pmevcntr, 0));
+	report(read_sysreg(pmovsclr_el0) == 0x1,
+		"should have triggered an overflow on #0");
+	report(!read_regn_el0(pmevcntr, 1),
+		"CHAIN counter #1 shouldn't have incremented");
+
+	/* start at 0xFFFFFFDC, +20 with CHAIN disabled, +20 with CHAIN enabled */
+
+	pmu_reset();
+	write_sysreg_s(0x1, PMCNTENSET_EL0);
+	write_regn_el0(pmevcntr, 0, PRE_OVERFLOW2);
+	isb();
+	report_info("counter #0 = 0x%lx, counter #1 = 0x%lx overflow=0x%lx",
+		    read_regn_el0(pmevcntr, 0), read_regn_el0(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_el0(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_el0(pmevcntr, 0));
+
+	report((read_regn_el0(pmevcntr, 1) == 1) && !read_sysreg(pmovsclr_el0),
+		"CHAIN counter enabled: CHAIN counter was incremented and no overflow");
+
+	report_info("CHAIN counter #1 = 0x%lx, overflow=0x%lx",
+		read_regn_el0(pmevcntr, 1), read_sysreg(pmovsclr_el0));
+
+	/* start as MEM_ACCESS/CPU_CYCLES and move to CHAIN/MEM_ACCESS */
+	pmu_reset();
+	write_regn_el0(pmevtyper, 0, MEM_ACCESS | PMEVTYPER_EXCLUDE_EL0);
+	write_regn_el0(pmevtyper, 1, CPU_CYCLES | PMEVTYPER_EXCLUDE_EL0);
+	write_sysreg_s(0x3, PMCNTENSET_EL0);
+	write_regn_el0(pmevcntr, 0, PRE_OVERFLOW2);
+	isb();
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report_info("MEM_ACCESS counter #0 has value 0x%lx",
+		    read_regn_el0(pmevcntr, 0));
+
+	/* 0 becomes CHAINED */
+	write_sysreg_s(0x0, PMCNTENSET_EL0);
+	write_regn_el0(pmevtyper, 1, CHAIN | PMEVTYPER_EXCLUDE_EL0);
+	write_sysreg_s(0x3, PMCNTENSET_EL0);
+	write_regn_el0(pmevcntr, 1, 0x0);
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report_info("MEM_ACCESS counter #0 has value 0x%lx",
+		    read_regn_el0(pmevcntr, 0));
+
+	report((read_regn_el0(pmevcntr, 1) == 1) && !read_sysreg(pmovsclr_el0),
+		"32b->64b: CHAIN counter incremented and no overflow");
+
+	report_info("CHAIN counter #1 = 0x%lx, overflow=0x%lx",
+		read_regn_el0(pmevcntr, 1), read_sysreg(pmovsclr_el0));
+
+	/* start as CHAIN/MEM_ACCESS and move to MEM_ACCESS/CPU_CYCLES */
+	pmu_reset();
+	write_regn_el0(pmevtyper, 0, MEM_ACCESS | PMEVTYPER_EXCLUDE_EL0);
+	write_regn_el0(pmevtyper, 1, CHAIN | PMEVTYPER_EXCLUDE_EL0);
+	write_regn_el0(pmevcntr, 0, PRE_OVERFLOW2);
+	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_el0(pmevcntr, 0), read_regn_el0(pmevcntr, 1));
+
+	write_sysreg_s(0x0, PMCNTENSET_EL0);
+	write_regn_el0(pmevtyper, 1, CPU_CYCLES | PMEVTYPER_EXCLUDE_EL0);
+	write_sysreg_s(0x3, PMCNTENSET_EL0);
+
+	mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+	report(read_sysreg(pmovsclr_el0) == 1,
+		"overflow is expected on counter 0");
+	report_info("counter #0=0x%lx, counter #1=0x%lx overflow=0x%lx",
+			read_regn_el0(pmevcntr, 0), read_regn_el0(pmevcntr, 1),
+			read_sysreg(pmovsclr_el0));
+}
+
 #endif
 
 /*
@@ -792,6 +926,10 @@ int main(int argc, char *argv[])
 		report_prefix_push(argv[1]);
 		test_chained_sw_incr();
 		report_prefix_pop();
+	} else if (strcmp(argv[1], "pmu-chain-promotion") == 0) {
+		report_prefix_push(argv[1]);
+		test_chain_promotion();
+		report_prefix_pop();
 	} else {
 		report_abort("Unknown sub-test '%s'", argv[1]);
 	}
diff --git a/arm/unittests.cfg b/arm/unittests.cfg
index d31dcbf6c56f..1b0c8c8c7eef 100644
--- a/arm/unittests.cfg
+++ b/arm/unittests.cfg
@@ -108,6 +108,12 @@ groups = pmu
 arch = arm64
 extra_params = -append 'pmu-chained-sw-incr'
 
+[pmu-chain-promotion]
+file = pmu.flat
+groups = pmu
+arch = arm64
+extra_params = -append 'pmu-chain-promotion'
+
 # Test PMU support (TCG) with -icount IPC=1
 #[pmu-tcg-icount-1]
 #file = pmu.flat
-- 
2.25.1