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From: Ricardo Koller <ricarkol@google.com>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	andrew.jones@linux.dev
Cc: maz@kernel.org
Subject: [kvm-unit-tests PATCH v3 3/3] arm: pmu: Check for overflow in the low counter in chained counters tests
Date: Thu,  4 Aug 2022 17:41:39 -0700	[thread overview]
Message-ID: <20220805004139.990531-4-ricarkol@google.com> (raw)
In-Reply-To: <20220805004139.990531-1-ricarkol@google.com>

A chained event overflowing on the low counter can set the overflow flag
in PMOVS.  KVM does not set it, but real HW and the fast-model seem to.
Moreover, the AArch64.IncrementEventCounter() pseudocode in the ARM ARM
(DDI 0487H.a, J1.1.1 "aarch64/debug") also sets the PMOVS bit on
overflow.

The pmu chain tests fail on bare metal when checking the overflow flag
of the low counter _not_ being set on overflow.  Fix by checking for
overflow. Note that this test fails in KVM without the respective fix.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Ricardo Koller <ricarkol@google.com>
---
 arm/pmu.c | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/arm/pmu.c b/arm/pmu.c
index 12e7d84e..0a7e12f8 100644
--- a/arm/pmu.c
+++ b/arm/pmu.c
@@ -583,7 +583,7 @@ static void test_chained_counters(void)
 	precise_instrs_loop(22, pmu.pmcr_ro | PMU_PMCR_E);
 
 	report(read_regn_el0(pmevcntr, 1) == 1, "CHAIN counter #1 incremented");
-	report(!read_sysreg(pmovsclr_el0), "no overflow recorded for chained incr #1");
+	report(read_sysreg(pmovsclr_el0) == 0x1, "overflow recorded for chained incr #1");
 
 	/* test 64b overflow */
 
@@ -595,7 +595,7 @@ static void test_chained_counters(void)
 	precise_instrs_loop(22, pmu.pmcr_ro | PMU_PMCR_E);
 	report_info("overflow reg = 0x%lx", read_sysreg(pmovsclr_el0));
 	report(read_regn_el0(pmevcntr, 1) == 2, "CHAIN counter #1 set to 2");
-	report(!read_sysreg(pmovsclr_el0), "no overflow recorded for chained incr #2");
+	report(read_sysreg(pmovsclr_el0) == 0x1, "overflow recorded for chained incr #2");
 
 	write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
 	write_regn_el0(pmevcntr, 1, ALL_SET);
@@ -603,7 +603,7 @@ static void test_chained_counters(void)
 	precise_instrs_loop(22, pmu.pmcr_ro | PMU_PMCR_E);
 	report_info("overflow reg = 0x%lx", read_sysreg(pmovsclr_el0));
 	report(!read_regn_el0(pmevcntr, 1), "CHAIN counter #1 wrapped");
-	report(read_sysreg(pmovsclr_el0) == 0x2, "overflow on chain counter");
+	report(read_sysreg(pmovsclr_el0) == 0x3, "overflow on even and odd counters");
 }
 
 static void test_chained_sw_incr(void)
@@ -629,8 +629,9 @@ static void test_chained_sw_incr(void)
 		write_sysreg(0x1, pmswinc_el0);
 
 	isb();
-	report(!read_sysreg(pmovsclr_el0) && (read_regn_el0(pmevcntr, 1) == 1),
-		"no overflow and chain counter incremented after 100 SW_INCR/CHAIN");
+	report((read_sysreg(pmovsclr_el0) == 0x1) &&
+		(read_regn_el0(pmevcntr, 1) == 1),
+		"overflow and chain counter incremented after 100 SW_INCR/CHAIN");
 	report_info("overflow=0x%lx, #0=%ld #1=%ld", read_sysreg(pmovsclr_el0),
 		    read_regn_el0(pmevcntr, 0), read_regn_el0(pmevcntr, 1));
 
@@ -648,10 +649,10 @@ static void test_chained_sw_incr(void)
 		write_sysreg(0x1, pmswinc_el0);
 
 	isb();
-	report((read_sysreg(pmovsclr_el0) == 0x2) &&
+	report((read_sysreg(pmovsclr_el0) == 0x3) &&
 		(read_regn_el0(pmevcntr, 1) == 0) &&
 		(read_regn_el0(pmevcntr, 0) == 84),
-		"overflow on chain counter and expected values after 100 SW_INCR/CHAIN");
+		"expected overflows and values after 100 SW_INCR/CHAIN");
 	report_info("overflow=0x%lx, #0=%ld #1=%ld", read_sysreg(pmovsclr_el0),
 		    read_regn_el0(pmevcntr, 0), read_regn_el0(pmevcntr, 1));
 }
@@ -731,8 +732,9 @@ static void test_chain_promotion(void)
 	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((read_regn_el0(pmevcntr, 1) == 1) &&
+		(read_sysreg(pmovsclr_el0) == 0x1),
+		"CHAIN counter enabled: CHAIN counter was incremented and overflow");
 
 	report_info("CHAIN counter #1 = 0x%lx, overflow=0x%lx",
 		read_regn_el0(pmevcntr, 1), read_sysreg(pmovsclr_el0));
@@ -759,8 +761,9 @@ static void test_chain_promotion(void)
 	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((read_regn_el0(pmevcntr, 1) == 1) &&
+		(read_sysreg(pmovsclr_el0) == 0x1),
+		"32b->64b: CHAIN counter incremented and overflow");
 
 	report_info("CHAIN counter #1 = 0x%lx, overflow=0x%lx",
 		read_regn_el0(pmevcntr, 1), read_sysreg(pmovsclr_el0));
@@ -868,8 +871,8 @@ static void test_overflow_interrupt(void)
 	write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
 	isb();
 	mem_access_loop(addr, 200, pmu.pmcr_ro | PMU_PMCR_E);
-	report(expect_interrupts(0),
-		"no overflow interrupt expected on 32b boundary");
+	report(expect_interrupts(0x1),
+		"expect overflow interrupt on 32b boundary");
 
 	/* overflow on odd counter */
 	pmu_reset_stats();
@@ -877,8 +880,8 @@ static void test_overflow_interrupt(void)
 	write_regn_el0(pmevcntr, 1, ALL_SET);
 	isb();
 	mem_access_loop(addr, 400, pmu.pmcr_ro | PMU_PMCR_E);
-	report(expect_interrupts(0x2),
-		"expect overflow interrupt on odd counter");
+	report(expect_interrupts(0x3),
+		"expect overflow interrupt on even and odd counter");
 }
 #endif
 
-- 
2.37.1.559.g78731f0fdb-goog

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  parent reply	other threads:[~2022-08-05  0:41 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-05  0:41 [kvm-unit-tests PATCH v3 0/3] arm: pmu: Fixes for bare metal Ricardo Koller
2022-08-05  0:41 ` [kvm-unit-tests PATCH v3 1/3] arm: pmu: Add missing isb()'s after sys register writing Ricardo Koller
2022-08-09 15:21   ` Alexandru Elisei
2022-08-05  0:41 ` [kvm-unit-tests PATCH v3 2/3] arm: pmu: Reset the pmu registers before starting some tests Ricardo Koller
2022-08-10 19:02   ` Andrew Jones
2022-08-10 23:33     ` Ricardo Koller
2022-08-11  7:04       ` Andrew Jones
2022-08-11 18:51         ` Ricardo Koller
2022-08-05  0:41 ` Ricardo Koller [this message]
2022-08-10 17:30   ` [kvm-unit-tests PATCH v3 3/3] arm: pmu: Check for overflow in the low counter in chained counters tests Oliver Upton
2022-08-10 18:28     ` Andrew Jones
2022-08-10 17:33 ` [kvm-unit-tests PATCH v3 0/3] arm: pmu: Fixes for bare metal Oliver Upton
2022-10-04 16:20 ` Eric Auger
2022-10-04 16:58   ` Alexandru Elisei
2022-10-04 17:31     ` Eric Auger
2022-10-05  9:21       ` Alexandru Elisei
2022-10-05  9:41         ` Alexandru Elisei
2022-10-05  9:51           ` Eric Auger
2022-10-05  9:50         ` Eric Auger
2022-10-06  9:25           ` Alexandru Elisei
2022-10-11  3:50           ` Ricardo Koller

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