On Mon, Jan 23, 2023 at 09:33:50PM +0100, Eric Auger wrote:
> Hi Ricardo,
>
> On 1/9/23 22:17, Ricardo Koller wrote:
> > Modify all tests checking overflows to support both 32 (PMCR_EL0.LP == 0)
> > and 64-bit overflows (PMCR_EL0.LP == 1). 64-bit overflows are only
> > supported on PMUv3p5.
> >
> > Note that chained tests do not implement "overflow_at_64bits == true".
> > That's because there are no CHAIN events when "PMCR_EL0.LP == 1" (for more
> > details see AArch64.IncrementEventCounter() pseudocode in the ARM ARM DDI
> > 0487H.a, J1.1.1 "aarch64/debug").
> >
> > Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
> > ---
> > arm/pmu.c | 116 +++++++++++++++++++++++++++++++++++-------------------
> > 1 file changed, 75 insertions(+), 41 deletions(-)
> >
> > diff --git a/arm/pmu.c b/arm/pmu.c
> > index 0d06b59..72d0f50 100644
> > --- a/arm/pmu.c
> > +++ b/arm/pmu.c
> > @@ -28,6 +28,7 @@
> > #define PMU_PMCR_X (1 << 4)
> > #define PMU_PMCR_DP (1 << 5)
> > #define PMU_PMCR_LC (1 << 6)
> > +#define PMU_PMCR_LP (1 << 7)
> > #define PMU_PMCR_N_SHIFT 11
> > #define PMU_PMCR_N_MASK 0x1f
> > #define PMU_PMCR_ID_SHIFT 16
> > @@ -56,9 +57,13 @@
> >
> > #define ALL_SET 0x00000000FFFFFFFFULL
> > #define ALL_CLEAR 0x0000000000000000ULL
> > -#define PRE_OVERFLOW 0x00000000FFFFFFF0ULL
> > +#define PRE_OVERFLOW_32 0x00000000FFFFFFF0ULL
> > +#define PRE_OVERFLOW_64 0xFFFFFFFFFFFFFFF0ULL
> > #define PRE_OVERFLOW2 0x00000000FFFFFFDCULL
> >
> > +#define PRE_OVERFLOW(__overflow_at_64bits) \
> > + (__overflow_at_64bits ? PRE_OVERFLOW_64 : PRE_OVERFLOW_32)
> > +
> > #define PMU_PPI 23
> >
> > struct pmu {
> > @@ -449,8 +454,10 @@ static bool check_overflow_prerequisites(bool overflow_at_64bits)
> > static void test_basic_event_count(bool overflow_at_64bits)
> > {
> > uint32_t implemented_counter_mask, non_implemented_counter_mask;
> > - uint32_t counter_mask;
> > + uint64_t pre_overflow = PRE_OVERFLOW(overflow_at_64bits);
> > + uint64_t pmcr_lp = overflow_at_64bits ? PMU_PMCR_LP : 0;
> > uint32_t events[] = {CPU_CYCLES, INST_RETIRED};
> > + uint32_t counter_mask;
> >
> > if (!satisfy_prerequisites(events, ARRAY_SIZE(events)) ||
> > !check_overflow_prerequisites(overflow_at_64bits))
> > @@ -472,13 +479,13 @@ static void test_basic_event_count(bool overflow_at_64bits)
> > * clear cycle and all event counters and allow counter enablement
> > * through PMCNTENSET. LC is RES1.
> > */
> > - set_pmcr(pmu.pmcr_ro | PMU_PMCR_LC | PMU_PMCR_C | PMU_PMCR_P);
> > + set_pmcr(pmu.pmcr_ro | PMU_PMCR_LC | PMU_PMCR_C | PMU_PMCR_P | pmcr_lp);
> > isb();
> > - report(get_pmcr() == (pmu.pmcr_ro | PMU_PMCR_LC), "pmcr: reset counters");
> > + report(get_pmcr() == (pmu.pmcr_ro | PMU_PMCR_LC | pmcr_lp), "pmcr: reset counters");
> >
> > /* Preset counter #0 to pre overflow value to trigger an overflow */
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > - report(read_regn_el0(pmevcntr, 0) == PRE_OVERFLOW,
> > + write_regn_el0(pmevcntr, 0, pre_overflow);
> > + report(read_regn_el0(pmevcntr, 0) == pre_overflow,
> > "counter #0 preset to pre-overflow value");
> > report(!read_regn_el0(pmevcntr, 1), "counter #1 is 0");
> >
> > @@ -531,6 +538,8 @@ static void test_mem_access(bool overflow_at_64bits)
> > {
> > void *addr = malloc(PAGE_SIZE);
> > uint32_t events[] = {MEM_ACCESS, MEM_ACCESS};
> > + uint64_t pre_overflow = PRE_OVERFLOW(overflow_at_64bits);
> > + uint64_t pmcr_lp = overflow_at_64bits ? PMU_PMCR_LP : 0;
> >
> > if (!satisfy_prerequisites(events, ARRAY_SIZE(events)) ||
> > !check_overflow_prerequisites(overflow_at_64bits))
> > @@ -542,7 +551,7 @@ static void test_mem_access(bool overflow_at_64bits)
> > write_regn_el0(pmevtyper, 1, MEM_ACCESS | PMEVTYPER_EXCLUDE_EL0);
> > write_sysreg_s(0x3, PMCNTENSET_EL0);
> > isb();
> > - mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
> > + mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E | pmcr_lp);
> > report_info("counter #0 is %ld (MEM_ACCESS)", read_regn_el0(pmevcntr, 0));
> > report_info("counter #1 is %ld (MEM_ACCESS)", read_regn_el0(pmevcntr, 1));
> > /* We may measure more than 20 mem access depending on the core */
> > @@ -552,11 +561,11 @@ static void test_mem_access(bool overflow_at_64bits)
> >
> > pmu_reset();
> >
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > - write_regn_el0(pmevcntr, 1, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, pre_overflow);
> > + write_regn_el0(pmevcntr, 1, pre_overflow);
> > write_sysreg_s(0x3, PMCNTENSET_EL0);
> > isb();
> > - mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
> > + mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E | pmcr_lp);
> > report(read_sysreg(pmovsclr_el0) == 0x3,
> > "Ran 20 mem accesses with expected overflows on both counters");
> > report_info("cnt#0 = %ld cnt#1=%ld overflow=0x%lx",
> > @@ -566,8 +575,10 @@ static void test_mem_access(bool overflow_at_64bits)
> >
> > static void test_sw_incr(bool overflow_at_64bits)
> > {
> > + uint64_t pre_overflow = PRE_OVERFLOW(overflow_at_64bits);
> > + uint64_t pmcr_lp = overflow_at_64bits ? PMU_PMCR_LP : 0;
> > uint32_t events[] = {SW_INCR, SW_INCR};
> > - uint64_t cntr0 = (PRE_OVERFLOW + 100) & pmevcntr_mask();
> > + uint64_t cntr0 = (pre_overflow + 100) & pmevcntr_mask();
> > int i;
> >
> > if (!satisfy_prerequisites(events, ARRAY_SIZE(events)) ||
> > @@ -581,7 +592,7 @@ static void test_sw_incr(bool overflow_at_64bits)
> > /* enable counters #0 and #1 */
> > write_sysreg_s(0x3, PMCNTENSET_EL0);
> >
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, pre_overflow);
> > isb();
> >
> > for (i = 0; i < 100; i++)
> > @@ -589,14 +600,14 @@ static void test_sw_incr(bool overflow_at_64bits)
> >
> > isb();
> > report_info("SW_INCR counter #0 has value %ld", read_regn_el0(pmevcntr, 0));
> > - report(read_regn_el0(pmevcntr, 0) == PRE_OVERFLOW,
> > + report(read_regn_el0(pmevcntr, 0) == pre_overflow,
> > "PWSYNC does not increment if PMCR.E is unset");
> >
> > pmu_reset();
> >
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, pre_overflow);
> > write_sysreg_s(0x3, PMCNTENSET_EL0);
> > - set_pmcr(pmu.pmcr_ro | PMU_PMCR_E);
> > + set_pmcr(pmu.pmcr_ro | PMU_PMCR_E | pmcr_lp);
> > isb();
> >
> > for (i = 0; i < 100; i++)
> > @@ -614,6 +625,7 @@ static void test_sw_incr(bool overflow_at_64bits)
> > static void test_chained_counters(bool unused)
> > {
> > uint32_t events[] = {CPU_CYCLES, CHAIN};
> > + uint64_t all_set = pmevcntr_mask();
> ALL_SET_32 may be enough, as suggested by Reiji;
I think we still want to conditionally use ALL_SET_64 for the
pre-overflow value of the odd counter in the case of PMUv3p5.
More below.
> >
> > if (!satisfy_prerequisites(events, ARRAY_SIZE(events)))
> > return;
> > @@ -624,7 +636,7 @@ static void test_chained_counters(bool unused)
> > write_regn_el0(pmevtyper, 1, CHAIN | PMEVTYPER_EXCLUDE_EL0);
> > /* enable counters #0 and #1 */
> > write_sysreg_s(0x3, PMCNTENSET_EL0);
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, PRE_OVERFLOW_32);
> >
> > precise_instrs_loop(22, pmu.pmcr_ro | PMU_PMCR_E);
> >
> > @@ -636,26 +648,26 @@ static void test_chained_counters(bool unused)
> > pmu_reset();
> > write_sysreg_s(0x3, PMCNTENSET_EL0);
> >
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, PRE_OVERFLOW_32);
> > write_regn_el0(pmevcntr, 1, 0x1);
> > 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) == 0x1, "overflow recorded for chained incr #2");
As we want to test the overflow of the chained counter, we need
ALL_SET_64 for its preoverflow value.
> >
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > - write_regn_el0(pmevcntr, 1, ALL_SET);
> > + write_regn_el0(pmevcntr, 0, PRE_OVERFLOW_32);
> > + write_regn_el0(pmevcntr, 1, all_set);
> and here
> >
> > 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_regn_el0(pmevcntr, 1) == 0, "CHAIN counter #1 wrapped");
> > report(read_sysreg(pmovsclr_el0) == 0x3, "overflow on even and odd counters");
> > }
> >
> > static void test_chained_sw_incr(bool unused)
> > {
> > uint32_t events[] = {SW_INCR, CHAIN};
> > - uint64_t cntr0 = (PRE_OVERFLOW + 100) & pmevcntr_mask();
> > + uint64_t cntr0 = (PRE_OVERFLOW_32 + 100) & pmevcntr_mask();
> > uint64_t cntr1 = (ALL_SET + 1) & pmevcntr_mask();
> > int i;
> the chained counter changes may be put in a separate patch to help the
> reviewer focus on the new 64b overflow tests.
Got it, will try that for the next version.
> >
> > @@ -669,7 +681,7 @@ static void test_chained_sw_incr(bool unused)
> > /* enable counters #0 and #1 */
> > write_sysreg_s(0x3, PMCNTENSET_EL0);
> >
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, PRE_OVERFLOW_32);
> > set_pmcr(pmu.pmcr_ro | PMU_PMCR_E);
> > isb();
> >
> > @@ -687,7 +699,7 @@ static void test_chained_sw_incr(bool unused)
> > pmu_reset();
> >
> > write_regn_el0(pmevtyper, 1, events[1] | PMEVTYPER_EXCLUDE_EL0);
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, PRE_OVERFLOW_32);
> > write_regn_el0(pmevcntr, 1, ALL_SET);
> > write_sysreg_s(0x3, PMCNTENSET_EL0);
> > set_pmcr(pmu.pmcr_ro | PMU_PMCR_E);
> > @@ -726,7 +738,7 @@ static void test_chain_promotion(bool unused)
> >
> > /* Only enable even counter */
> > pmu_reset();
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, PRE_OVERFLOW_32);
> > write_sysreg_s(0x1, PMCNTENSET_EL0);
> > isb();
> >
> > @@ -856,6 +868,9 @@ static bool expect_interrupts(uint32_t bitmap)
> >
> > static void test_overflow_interrupt(bool overflow_at_64bits)
> > {
> > + uint64_t pre_overflow = PRE_OVERFLOW(overflow_at_64bits);
> > + uint64_t all_set = pmevcntr_mask();
> > + uint64_t pmcr_lp = overflow_at_64bits ? PMU_PMCR_LP : 0;
> > uint32_t events[] = {MEM_ACCESS, SW_INCR};
> > void *addr = malloc(PAGE_SIZE);
> > int i;
> > @@ -874,16 +889,16 @@ static void test_overflow_interrupt(bool overflow_at_64bits)
> > write_regn_el0(pmevtyper, 0, MEM_ACCESS | PMEVTYPER_EXCLUDE_EL0);
> > write_regn_el0(pmevtyper, 1, SW_INCR | PMEVTYPER_EXCLUDE_EL0);
> > write_sysreg_s(0x3, PMCNTENSET_EL0);
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > - write_regn_el0(pmevcntr, 1, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, pre_overflow);
> > + write_regn_el0(pmevcntr, 1, pre_overflow);
> > isb();
> >
> > /* interrupts are disabled (PMINTENSET_EL1 == 0) */
> >
> > - mem_access_loop(addr, 200, pmu.pmcr_ro | PMU_PMCR_E);
> > + mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E | pmcr_lp);
> I noticed that undocumented change. Is it done on purpose?
Yes, it's intentional. It conditionally sets PMCR.LP for the next
subtest when overflow_at_64bits==true. That's also why the pre-overflow
value is close to ALL_SET_64 (and not ALL_SET_32).
> > report(expect_interrupts(0), "no overflow interrupt after preset");
> >
> > - set_pmcr(pmu.pmcr_ro | PMU_PMCR_E);
> > + set_pmcr(pmu.pmcr_ro | PMU_PMCR_E | pmcr_lp);
> > isb();
> >
> > for (i = 0; i < 100; i++)
> > @@ -898,12 +913,12 @@ static void test_overflow_interrupt(bool overflow_at_64bits)
> >
> > pmu_reset_stats();
> >
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > - write_regn_el0(pmevcntr, 1, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, pre_overflow);
> > + write_regn_el0(pmevcntr, 1, pre_overflow);
> > write_sysreg(ALL_SET, pmintenset_el1);
> > isb();
> >
> > - mem_access_loop(addr, 200, pmu.pmcr_ro | PMU_PMCR_E);
> > + mem_access_loop(addr, 200, pmu.pmcr_ro | PMU_PMCR_E | pmcr_lp);
> > for (i = 0; i < 100; i++)
> > write_sysreg(0x3, pmswinc_el0);
> >
> > @@ -912,25 +927,40 @@ static void test_overflow_interrupt(bool overflow_at_64bits)
> > report(expect_interrupts(0x3),
> > "overflow interrupts expected on #0 and #1");
> >
> > - /* promote to 64-b */
> > + /*
> > + * promote to 64-b:
> > + *
> > + * This only applies to the !overflow_at_64bits case, as
> > + * overflow_at_64bits doesn't implement CHAIN events. The
> > + * overflow_at_64bits case just checks that chained counters are
> > + * not incremented when PMCR.LP == 1.
> > + */
> >
> > pmu_reset_stats();
> >
> > write_regn_el0(pmevtyper, 1, CHAIN | PMEVTYPER_EXCLUDE_EL0);
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > + write_regn_el0(pmevcntr, 0, pre_overflow);
> > isb();
> > - mem_access_loop(addr, 200, pmu.pmcr_ro | PMU_PMCR_E);
> > - report(expect_interrupts(0x1),
> > - "expect overflow interrupt on 32b boundary");
> > + mem_access_loop(addr, 200, pmu.pmcr_ro | PMU_PMCR_E | pmcr_lp);
> > + report(expect_interrupts(0x1), "expect overflow interrupt");
> >
> > /* overflow on odd counter */
> > pmu_reset_stats();
> > - write_regn_el0(pmevcntr, 0, PRE_OVERFLOW);
> > - write_regn_el0(pmevcntr, 1, ALL_SET);
> > + write_regn_el0(pmevcntr, 0, pre_overflow);
> > + write_regn_el0(pmevcntr, 1, all_set);
> > isb();
> > - mem_access_loop(addr, 400, pmu.pmcr_ro | PMU_PMCR_E);
> > - report(expect_interrupts(0x3),
> > - "expect overflow interrupt on even and odd counter");
> > + mem_access_loop(addr, 400, pmu.pmcr_ro | PMU_PMCR_E | pmcr_lp);
> > + if (overflow_at_64bits) {
> > + report(expect_interrupts(0x1),
> > + "expect overflow interrupt on even counter");
> > + report(read_regn_el0(pmevcntr, 1) == all_set,
> > + "Odd counter did not change");
> > + } else {
> > + report(expect_interrupts(0x3),
> > + "expect overflow interrupt on even and odd counter");
> > + report(read_regn_el0(pmevcntr, 1) != all_set,
> > + "Odd counter wrapped");
> > + }
> > }
> > #endif
> >
> > @@ -1131,10 +1161,13 @@ int main(int argc, char *argv[])
> > report_prefix_pop();
> > } else if (strcmp(argv[1], "pmu-basic-event-count") == 0) {
> > run_test(argv[1], test_basic_event_count, false);
> > + run_test(argv[1], test_basic_event_count, true);
> > } else if (strcmp(argv[1], "pmu-mem-access") == 0) {
> > run_test(argv[1], test_mem_access, false);
> > + run_test(argv[1], test_mem_access, true);
> > } else if (strcmp(argv[1], "pmu-sw-incr") == 0) {
> > run_test(argv[1], test_sw_incr, false);
> > + run_test(argv[1], test_sw_incr, true);
> > } else if (strcmp(argv[1], "pmu-chained-counters") == 0) {
> > run_test(argv[1], test_chained_counters, false);
> > } else if (strcmp(argv[1], "pmu-chained-sw-incr") == 0) {
> > @@ -1143,6 +1176,7 @@ int main(int argc, char *argv[])
> > run_test(argv[1], test_chain_promotion, false);
> > } else if (strcmp(argv[1], "pmu-overflow-interrupt") == 0) {
> > run_test(argv[1], test_overflow_interrupt, false);
> > + run_test(argv[1], test_overflow_interrupt, true);
> > } else {
> > report_abort("Unknown sub-test '%s'", argv[1]);
> > }
> Thanks
>
> Eric
>
