Adds the following tests:
- event-counter-config: test event counter configuration
- basic-event-count:
- programs counters #0 and #1 to count 2 required events
(resp. CPU_CYCLES and INST_RETIRED). Counter #0 is preset
to a value close enough to the 32b
overflow limit so that we check the overflow bit is set
after the execution of the asm loop.
- mem-access: counts MEM_ACCESS event on counters #0 and #1
with and without 32-bit overflow.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
arm/pmu.c | 254 ++++++++++++++++++++++++++++++++++++++++++++++
arm/unittests.cfg | 18 ++++
2 files changed, 272 insertions(+)
diff --git a/arm/pmu.c b/arm/pmu.c
index f78c43f..8ffeb93 100644
--- a/arm/pmu.c
+++ b/arm/pmu.c
@@ -18,9 +18,15 @@
#include "asm/barrier.h"
#include "asm/sysreg.h"
#include "asm/processor.h"
+#include <bitops.h>
+#include <asm/gic.h>
#define PMU_PMCR_E (1 << 0)
+#define PMU_PMCR_P (1 << 1)
#define PMU_PMCR_C (1 << 2)
+#define PMU_PMCR_D (1 << 3)
+#define PMU_PMCR_X (1 << 4)
+#define PMU_PMCR_DP (1 << 5)
#define PMU_PMCR_LC (1 << 6)
#define PMU_PMCR_N_SHIFT 11
#define PMU_PMCR_N_MASK 0x1f
@@ -105,6 +111,9 @@ static inline void precise_instrs_loop(int loop, uint32_t pmcr)
/* event counter tests only implemented for aarch64 */
static void test_event_introspection(void) {}
+static void test_event_counter_config(void) {}
+static void test_basic_event_count(void) {}
+static void test_mem_access(void) {}
#elif defined(__aarch64__)
#define ID_AA64DFR0_PERFMON_SHIFT 8
@@ -146,6 +155,32 @@ static inline void precise_instrs_loop(int loop, uint32_t pmcr)
}
#define PMCEID1_EL0 sys_reg(11, 3, 9, 12, 7)
+#define PMCNTENSET_EL0 sys_reg(11, 3, 9, 12, 1)
+#define PMCNTENCLR_EL0 sys_reg(11, 3, 9, 12, 2)
+
+#define PMEVTYPER_EXCLUDE_EL1 (1 << 31)
+#define PMEVTYPER_EXCLUDE_EL0 (1 << 30)
+
+#define regn_el0(__reg, __n) __reg ## __n ## _el0
+#define write_regn(__reg, __n, __val) \
+ write_sysreg((__val), __reg ## __n ## _el0)
+
+#define read_regn(__reg, __n) \
+ read_sysreg(__reg ## __n ## _el0)
+
+#define print_pmevtyper(__s , __n) do { \
+ uint32_t val; \
+ val = read_regn(pmevtyper, __n);\
+ report_info("%s pmevtyper%d=0x%x, eventcount=0x%x (p=%ld, u=%ld nsk=%ld, nsu=%ld, nsh=%ld m=%ld, mt=%ld)", \
+ (__s), (__n), val, val & 0xFFFF, \
+ (BIT_MASK(31) & val) >> 31, \
+ (BIT_MASK(30) & val) >> 30, \
+ (BIT_MASK(29) & val) >> 29, \
+ (BIT_MASK(28) & val) >> 28, \
+ (BIT_MASK(27) & val) >> 27, \
+ (BIT_MASK(26) & val) >> 26, \
+ (BIT_MASK(25) & val) >> 25); \
+ } while (0)
static bool is_event_supported(uint32_t n, bool warn)
{
@@ -207,6 +242,216 @@ static void test_event_introspection(void)
report("Check required events are implemented", required_events);
}
+static inline void mem_access_loop(void *addr, int loop, uint32_t pmcr)
+{
+asm volatile(
+ " msr pmcr_el0, %[pmcr]\n"
+ " isb\n"
+ " mov x10, %[loop]\n"
+ "1: sub x10, x10, #1\n"
+ " mov x8, %[addr]\n"
+ " ldr x9, [x8]\n"
+ " cmp x10, #0x0\n"
+ " b.gt 1b\n"
+ " msr pmcr_el0, xzr\n"
+ " isb\n"
+ :
+ : [addr] "r" (addr), [pmcr] "r" (pmcr), [loop] "r" (loop)
+ : );
+}
+
+
+static void pmu_reset(void)
+{
+ /* reset all counters, counting disabled at PMCR level*/
+ set_pmcr(pmu.pmcr_ro | PMU_PMCR_LC | PMU_PMCR_C | PMU_PMCR_P);
+ /* Disable all counters */
+ write_sysreg_s(0xFFFFFFFF, PMCNTENCLR_EL0);
+ /* clear overflow reg */
+ write_sysreg(0xFFFFFFFF, pmovsclr_el0);
+ /* disable overflow interrupts on all counters */
+ write_sysreg(0xFFFFFFFF, pmintenclr_el1);
+ isb();
+}
+
+static void test_event_counter_config(void) {
+ int i;
+
+ if (!pmu.nb_implemented_counters) {
+ report_skip("No event counter, skip ...");
+ return;
+ }
+
+ pmu_reset();
+
+ /* Test setting through PMESELR/PMXEVTYPER and PMEVTYPERn read */
+ /* select counter 0 */
+ write_sysreg(1, PMSELR_EL0);
+ /* program this counter to count unsupported event */
+ write_sysreg(0xEA, PMXEVTYPER_EL0);
+ write_sysreg(0xdeadbeef, PMXEVCNTR_EL0);
+ report("PMESELR/PMXEVTYPER/PMEVTYPERn",
+ (read_regn(pmevtyper, 1) & 0xFFF) == 0xEA);
+ report("PMESELR/PMXEVCNTR/PMEVCNTRn",
+ (read_regn(pmevcntr, 1) == 0xdeadbeef));
+
+ /* try configure an unsupported event within the range [0x0, 0x3F] */
+ for (i = 0; i <= 0x3F; i++) {
+ if (!is_event_supported(i, false))
+ goto test_unsupported;
+ }
+ report_skip("pmevtyper: all events within [0x0, 0x3F] are supported");
+
+test_unsupported:
+ /* select counter 0 */
+ write_sysreg(0, PMSELR_EL0);
+ /* program this counter to count unsupported event */
+ write_sysreg(i, PMXEVCNTR_EL0);
+ /* read the counter value */
+ read_sysreg(PMXEVCNTR_EL0);
+ report("read of a counter programmed with unsupported event", read_sysreg(PMXEVCNTR_EL0) == i);
+
+}
+
+static bool satisfy_prerequisites(uint32_t *events, unsigned int nb_events)
+{
+ int i;
+
+ if (pmu.nb_implemented_counters < nb_events) {
+ report_skip("Skip test as number of counters is too small (%d)",
+ pmu.nb_implemented_counters);
+ return false;
+ }
+
+ for (i = 0; i < nb_events; i++) {
+ if (!is_event_supported(events[i], false)) {
+ report_skip("Skip test as event %d is not supported",
+ events[i]);
+ return false;
+ }
+ }
+ return true;
+}
+
+static void test_basic_event_count(void)
+{
+ uint32_t implemented_counter_mask, non_implemented_counter_mask;
+ uint32_t counter_mask;
+ uint32_t events[] = {
+ 0x11, /* CPU_CYCLES */
+ 0x8, /* INST_RETIRED */
+ };
+
+ if (!satisfy_prerequisites(events, ARRAY_SIZE(events)))
+ return;
+
+ implemented_counter_mask = (1 << pmu.nb_implemented_counters) - 1;
+ non_implemented_counter_mask = ~((1 << 31) | implemented_counter_mask);
+ counter_mask = implemented_counter_mask | non_implemented_counter_mask;
+
+ write_regn(pmevtyper, 0, events[0] | PMEVTYPER_EXCLUDE_EL0);
+ write_regn(pmevtyper, 1, events[1] | PMEVTYPER_EXCLUDE_EL0);
+
+ /* disable all counters */
+ write_sysreg_s(0xFFFFFFFF, PMCNTENCLR_EL0);
+ report("pmcntenclr: disable all counters",
+ !read_sysreg_s(PMCNTENCLR_EL0) && !read_sysreg_s(PMCNTENSET_EL0));
+
+ /*
+ * 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);
+ isb();
+ report("pmcr: reset counters", get_pmcr() == (pmu.pmcr_ro | PMU_PMCR_LC));
+
+ /* Preset counter #0 to 0xFFFFFFF0 to trigger an overflow interrupt */
+ write_regn(pmevcntr, 0, 0xFFFFFFF0);
+ report("counter #0 preset to 0xFFFFFFF0",
+ read_regn(pmevcntr, 0) == 0xFFFFFFF0);
+ report("counter #1 is 0", !read_regn(pmevcntr, 1));
+
+ /*
+ * Enable all implemented counters and also attempt to enable
+ * not supported counters. Counting still is disabled by !PMCR.E
+ */
+ write_sysreg_s(counter_mask, PMCNTENSET_EL0);
+
+ /* check only those implemented are enabled */
+ report("pmcntenset: enabled implemented_counters",
+ (read_sysreg_s(PMCNTENSET_EL0) == read_sysreg_s(PMCNTENCLR_EL0)) &&
+ (read_sysreg_s(PMCNTENSET_EL0) == implemented_counter_mask));
+
+ /* Disable all counters but counters #0 and #1 */
+ write_sysreg_s(~0x3, PMCNTENCLR_EL0);
+ report("pmcntenset: just enabled #0 and #1",
+ (read_sysreg_s(PMCNTENSET_EL0) == read_sysreg_s(PMCNTENCLR_EL0)) &&
+ (read_sysreg_s(PMCNTENSET_EL0) == 0x3));
+
+ /* clear overflow register */
+ write_sysreg(0xFFFFFFFF, pmovsclr_el0);
+ report("check overflow reg is 0", !read_sysreg(pmovsclr_el0));
+
+ /* disable overflow interrupts on all counters*/
+ write_sysreg(0xFFFFFFFF, pmintenclr_el1);
+ report("pmintenclr_el1=0, all interrupts disabled",
+ !read_sysreg(pmintenclr_el1));
+
+ /* enable overflow interrupts on all event counters */
+ write_sysreg(implemented_counter_mask | non_implemented_counter_mask,
+ pmintenset_el1);
+ report("overflow interrupts enabled on all implemented counters",
+ read_sysreg(pmintenset_el1) == implemented_counter_mask);
+
+ /* Set PMCR.E, execute asm code and unset PMCR.E */
+ precise_instrs_loop(20, pmu.pmcr_ro | PMU_PMCR_E);
+
+ report_info("counter #0 is 0x%lx (CPU_CYCLES)", read_regn(pmevcntr, 0));
+ report_info("counter #1 is 0x%lx (INST_RETIRED)", read_regn(pmevcntr, 1));
+
+ report_info("overflow reg = 0x%lx", read_sysreg(pmovsclr_el0) );
+ report("check overflow happened on #0 only", read_sysreg(pmovsclr_el0) & 0x1);
+}
+
+static void test_mem_access(void)
+{
+ void *addr = malloc(PAGE_SIZE);
+ uint32_t events[] = {
+ 0x13, /* MEM_ACCESS */
+ 0x13, /* MEM_ACCESS */
+ };
+
+ if (!satisfy_prerequisites(events, ARRAY_SIZE(events)))
+ return;
+
+ pmu_reset();
+
+ write_regn(pmevtyper, 0, events[0] | PMEVTYPER_EXCLUDE_EL0);
+ write_regn(pmevtyper, 1, events[1] | PMEVTYPER_EXCLUDE_EL0);
+ write_sysreg_s(0x3, PMCNTENSET_EL0);
+ isb();
+ mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+ report_info("counter #0 is %ld (MEM_ACCESS)", read_regn(pmevcntr, 0));
+ report_info("counter #1 is %ld (MEM_ACCESS)", read_regn(pmevcntr, 1));
+ /* We may not measure exactly 20 mem access, this depends on the platform */
+ report("Ran 20 mem accesses",
+ (read_regn(pmevcntr, 0) == read_regn(pmevcntr, 1)) &&
+ (read_regn(pmevcntr, 0) >= 20) && !read_sysreg(pmovsclr_el0));
+
+ pmu_reset();
+
+ write_regn(pmevcntr, 0, 0xFFFFFFFA);
+ write_regn(pmevcntr, 1, 0xFFFFFFF0);
+ write_sysreg_s(0x3, PMCNTENSET_EL0);
+ isb();
+ mem_access_loop(addr, 20, pmu.pmcr_ro | PMU_PMCR_E);
+ report("Ran 20 mem accesses with expected overflows on both counters",
+ read_sysreg(pmovsclr_el0) == 0x3);
+ report_info("cnt#0 = %ld cnt#1=%ld overflow=0x%lx",
+ read_regn(pmevcntr, 0), read_regn(pmevcntr, 1),
+ read_sysreg(pmovsclr_el0));
+}
+
#endif
/*
@@ -394,6 +639,15 @@ int main(int argc, char *argv[])
} else if (strcmp(argv[1], "event-introspection") == 0) {
report_prefix_push(argv[1]);
test_event_introspection();
+ } else if (strcmp(argv[1], "event-counter-config") == 0) {
+ report_prefix_push(argv[1]);
+ test_event_counter_config();
+ } else if (strcmp(argv[1], "basic-event-count") == 0) {
+ report_prefix_push(argv[1]);
+ test_basic_event_count();
+ } else if (strcmp(argv[1], "mem-access") == 0) {
+ report_prefix_push(argv[1]);
+ test_mem_access();
} else {
report_abort("Unknown subtest '%s'", argv[1]);
}
diff --git a/arm/unittests.cfg b/arm/unittests.cfg
index 4433ef3..7a59403 100644
--- a/arm/unittests.cfg
+++ b/arm/unittests.cfg
@@ -72,6 +72,24 @@ groups = pmu
arch = arm64
extra_params = -append 'event-introspection'
+[pmu-event-counter-config]
+file = pmu.flat
+groups = pmu
+arch = arm64
+extra_params = -append 'event-counter-config'
+
+[pmu-basic-event-count]
+file = pmu.flat
+groups = pmu
+arch = arm64
+extra_params = -append 'basic-event-count'
+
+[pmu-mem-access]
+file = pmu.flat
+groups = pmu
+arch = arm64
+extra_params = -append 'mem-access'
+
# Test PMU support (TCG) with -icount IPC=1
#[pmu-tcg-icount-1]
#file = pmu.flat
--
2.20.1
