On Tue, Dec 13, 2022 at 05:03:40PM +0000, Alexandru Elisei wrote:
> Hi,
>
> Checked that all places where ALL_SET/PRE_OVERFLOW were used are now taking
> into account the fact that counters are programmed to be 64bit.
>
> In the case of 64bit counters, the printf format specifier is %ld, which
> means that ALL_SET_64 and PRE_OVERFLOW_64 are now displayed as negative
> numbers. For example:
>
> INFO: pmu: pmu-sw-incr: 32-bit: SW_INCR counter #0 has value 4294967280
> PASS: pmu: pmu-sw-incr: 32-bit: PWSYNC does not increment if PMCR.E is unset
> [..]
> INFO: pmu: pmu-sw-incr: 64-bit: SW_INCR counter #0 has value -16
> PASS: pmu: pmu-sw-incr: 64-bit: PWSYNC does not increment if PMCR.E is unset
>
Argh, I didn't notice this. I think this would be more useful if it
printed %llx in all cases.
> I was thinking that the format specifiers could be changed to unsigned
> long. The counters only increment, they don't decrement, and I can't think
> how printing them as signed could be useful.
>
> One more comment below.
>
> On Fri, Dec 02, 2022 at 04:55:27AM +0000, 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 <ricar...@google.com>
> > ---
> > arm/pmu.c | 91 ++++++++++++++++++++++++++++++++++++-------------------
> > 1 file changed, 60 insertions(+), 31 deletions(-)
> >
> > diff --git a/arm/pmu.c b/arm/pmu.c
> > index 59e5bfe..3cb563b 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
> > @@ -55,10 +56,15 @@
> > #define EXT_COMMON_EVENTS_HIGH 0x403F
> >
> > #define ALL_SET 0x00000000FFFFFFFFULL
> > +#define ALL_SET_64 0xFFFFFFFFFFFFFFFFULL
> > #define ALL_CLEAR 0x0000000000000000ULL
> > #define PRE_OVERFLOW 0x00000000FFFFFFF0ULL
> > +#define PRE_OVERFLOW_64 0xFFFFFFFFFFFFFFF0ULL
> > #define PRE_OVERFLOW2 0x00000000FFFFFFDCULL
> >
> > +#define PRE_OVERFLOW_AT(_64b) (_64b ? PRE_OVERFLOW_64 : PRE_OVERFLOW)
> > +#define ALL_SET_AT(_64b) (_64b ? ALL_SET_64 : ALL_SET)
> > +
> > #define PMU_PPI 23
> >
> > struct pmu {
> > @@ -429,8 +435,10 @@ static bool satisfy_prerequisites(uint32_t *events,
> > unsigned int nb_events,
> > 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_AT(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),
> > overflow_at_64bits))
> > @@ -452,13 +460,13 @@ 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");
> >
> > @@ -511,6 +519,8 @@ 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_AT(overflow_at_64bits);
> > + uint64_t pmcr_lp = overflow_at_64bits ? PMU_PMCR_LP : 0;
> >
> > if (!satisfy_prerequisites(events, ARRAY_SIZE(events),
> > overflow_at_64bits))
> > @@ -522,7 +532,7 @@ 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 */
> > @@ -532,11 +542,11 @@ 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",
> > @@ -546,6 +556,8 @@ static void test_mem_access(bool overflow_at_64bits)
> >
> > static void test_sw_incr(bool overflow_at_64bits)
> > {
> > + uint64_t pre_overflow = PRE_OVERFLOW_AT(overflow_at_64bits);
> > + uint64_t pmcr_lp = overflow_at_64bits ? PMU_PMCR_LP : 0;
> > uint32_t events[] = {SW_INCR, SW_INCR};
> > uint64_t cntr0;
> > int i;
> > @@ -561,7 +573,7 @@ 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++)
> > @@ -569,21 +581,21 @@ 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++)
> > write_sysreg(0x3, pmswinc_el0);
> >
> > isb();
> > - cntr0 = (pmu.version < ID_DFR0_PMU_V3_8_5) ? 84 : PRE_OVERFLOW + 100;
> > + cntr0 = (pmu.version < ID_DFR0_PMU_V3_8_5) ? 84 : pre_overflow + 100;
> > report(read_regn_el0(pmevcntr, 0) == cntr0, "counter #0 after + 100
> > SW_INCR");
> > report(read_regn_el0(pmevcntr, 1) == 100, "counter #1 after + 100
> > SW_INCR");
> > report_info("counter values after 100 SW_INCR #0=%ld #1=%ld",
> > @@ -844,6 +856,9 @@ static bool expect_interrupts(uint32_t bitmap)
> >
> > static void test_overflow_interrupt(bool overflow_at_64bits)
> > {
> > + uint64_t pre_overflow = PRE_OVERFLOW_AT(overflow_at_64bits);
> > + uint64_t all_set = ALL_SET_AT(overflow_at_64bits);
> > + 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;
> > @@ -862,16 +877,16 @@ 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);
> > 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++)
> > @@ -886,12 +901,12 @@ 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);
> >
> > @@ -900,25 +915,35 @@ 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.
> > + */
>
> If this doesn't do anything for when overflow_at_64bits, and since the
> interrupt is already tested before this part, why not exit early?
>
> Or the test could check that the CHAIN event indeed does not increment when
> LP=1 at the end of this function.
That's precisely what it's doing.
Thanks!
Ricardo
>
> Thanks,
> Alex
>
> >
> > 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");
> > + else
> > + report(expect_interrupts(0x3),
> > + "expect overflow interrupt on even and odd counter");
> > }
> > #endif
> >
> > @@ -1119,10 +1144,13 @@ 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) {
> > @@ -1131,6 +1159,7 @@ 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]);
> > }
> > --
> > 2.39.0.rc0.267.gcb52ba06e7-goog
> >
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