diff options
Diffstat (limited to 'tools/testing/selftests/kvm/aarch64/arch_timer.c')
| -rw-r--r-- | tools/testing/selftests/kvm/aarch64/arch_timer.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c new file mode 100644 index 000000000000..ddba2c2fb5de --- /dev/null +++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * The test validates both the virtual and physical timer IRQs using + * CVAL and TVAL registers. + * + * Copyright (c) 2021, Google LLC. + */ +#define _GNU_SOURCE + +#include "arch_timer.h" +#include "delay.h" +#include "gic.h" +#include "processor.h" +#include "timer_test.h" +#include "vgic.h" + +#define GICD_BASE_GPA 0x8000000ULL +#define GICR_BASE_GPA 0x80A0000ULL + +enum guest_stage { + GUEST_STAGE_VTIMER_CVAL = 1, + GUEST_STAGE_VTIMER_TVAL, + GUEST_STAGE_PTIMER_CVAL, + GUEST_STAGE_PTIMER_TVAL, + GUEST_STAGE_MAX, +}; + +static int vtimer_irq, ptimer_irq; + +static void +guest_configure_timer_action(struct test_vcpu_shared_data *shared_data) +{ + switch (shared_data->guest_stage) { + case GUEST_STAGE_VTIMER_CVAL: + timer_set_next_cval_ms(VIRTUAL, test_args.timer_period_ms); + shared_data->xcnt = timer_get_cntct(VIRTUAL); + timer_set_ctl(VIRTUAL, CTL_ENABLE); + break; + case GUEST_STAGE_VTIMER_TVAL: + timer_set_next_tval_ms(VIRTUAL, test_args.timer_period_ms); + shared_data->xcnt = timer_get_cntct(VIRTUAL); + timer_set_ctl(VIRTUAL, CTL_ENABLE); + break; + case GUEST_STAGE_PTIMER_CVAL: + timer_set_next_cval_ms(PHYSICAL, test_args.timer_period_ms); + shared_data->xcnt = timer_get_cntct(PHYSICAL); + timer_set_ctl(PHYSICAL, CTL_ENABLE); + break; + case GUEST_STAGE_PTIMER_TVAL: + timer_set_next_tval_ms(PHYSICAL, test_args.timer_period_ms); + shared_data->xcnt = timer_get_cntct(PHYSICAL); + timer_set_ctl(PHYSICAL, CTL_ENABLE); + break; + default: + GUEST_ASSERT(0); + } +} + +static void guest_validate_irq(unsigned int intid, + struct test_vcpu_shared_data *shared_data) +{ + enum guest_stage stage = shared_data->guest_stage; + uint64_t xcnt = 0, xcnt_diff_us, cval = 0; + unsigned long xctl = 0; + unsigned int timer_irq = 0; + unsigned int accessor; + + if (intid == IAR_SPURIOUS) + return; + + switch (stage) { + case GUEST_STAGE_VTIMER_CVAL: + case GUEST_STAGE_VTIMER_TVAL: + accessor = VIRTUAL; + timer_irq = vtimer_irq; + break; + case GUEST_STAGE_PTIMER_CVAL: + case GUEST_STAGE_PTIMER_TVAL: + accessor = PHYSICAL; + timer_irq = ptimer_irq; + break; + default: + GUEST_ASSERT(0); + return; + } + + xctl = timer_get_ctl(accessor); + if ((xctl & CTL_IMASK) || !(xctl & CTL_ENABLE)) + return; + + timer_set_ctl(accessor, CTL_IMASK); + xcnt = timer_get_cntct(accessor); + cval = timer_get_cval(accessor); + + xcnt_diff_us = cycles_to_usec(xcnt - shared_data->xcnt); + + /* Make sure we are dealing with the correct timer IRQ */ + GUEST_ASSERT_EQ(intid, timer_irq); + + /* Basic 'timer condition met' check */ + __GUEST_ASSERT(xcnt >= cval, + "xcnt = 0x%lx, cval = 0x%lx, xcnt_diff_us = 0x%lx", + xcnt, cval, xcnt_diff_us); + __GUEST_ASSERT(xctl & CTL_ISTATUS, "xctl = 0x%lx", xctl); + + WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter + 1); +} + +static void guest_irq_handler(struct ex_regs *regs) +{ + unsigned int intid = gic_get_and_ack_irq(); + uint32_t cpu = guest_get_vcpuid(); + struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu]; + + guest_validate_irq(intid, shared_data); + + gic_set_eoi(intid); +} + +static void guest_run_stage(struct test_vcpu_shared_data *shared_data, + enum guest_stage stage) +{ + uint32_t irq_iter, config_iter; + + shared_data->guest_stage = stage; + shared_data->nr_iter = 0; + + for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) { + /* Setup the next interrupt */ + guest_configure_timer_action(shared_data); + + /* Setup a timeout for the interrupt to arrive */ + udelay(msecs_to_usecs(test_args.timer_period_ms) + + test_args.timer_err_margin_us); + + irq_iter = READ_ONCE(shared_data->nr_iter); + __GUEST_ASSERT(config_iter + 1 == irq_iter, + "config_iter + 1 = 0x%lx, irq_iter = 0x%lx.\n" + " Guest timer interrupt was not trigged within the specified\n" + " interval, try to increase the error margin by [-e] option.\n", + config_iter + 1, irq_iter); + } +} + +static void guest_code(void) +{ + uint32_t cpu = guest_get_vcpuid(); + struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu]; + + local_irq_disable(); + + gic_init(GIC_V3, test_args.nr_vcpus, + (void *)GICD_BASE_GPA, (void *)GICR_BASE_GPA); + + timer_set_ctl(VIRTUAL, CTL_IMASK); + timer_set_ctl(PHYSICAL, CTL_IMASK); + + gic_irq_enable(vtimer_irq); + gic_irq_enable(ptimer_irq); + local_irq_enable(); + + guest_run_stage(shared_data, GUEST_STAGE_VTIMER_CVAL); + guest_run_stage(shared_data, GUEST_STAGE_VTIMER_TVAL); + guest_run_stage(shared_data, GUEST_STAGE_PTIMER_CVAL); + guest_run_stage(shared_data, GUEST_STAGE_PTIMER_TVAL); + + GUEST_DONE(); +} + +static void test_init_timer_irq(struct kvm_vm *vm) +{ + /* Timer initid should be same for all the vCPUs, so query only vCPU-0 */ + vcpu_device_attr_get(vcpus[0], KVM_ARM_VCPU_TIMER_CTRL, + KVM_ARM_VCPU_TIMER_IRQ_PTIMER, &ptimer_irq); + vcpu_device_attr_get(vcpus[0], KVM_ARM_VCPU_TIMER_CTRL, + KVM_ARM_VCPU_TIMER_IRQ_VTIMER, &vtimer_irq); + + sync_global_to_guest(vm, ptimer_irq); + sync_global_to_guest(vm, vtimer_irq); + + pr_debug("ptimer_irq: %d; vtimer_irq: %d\n", ptimer_irq, vtimer_irq); +} + +static int gic_fd; + +struct kvm_vm *test_vm_create(void) +{ + struct kvm_vm *vm; + unsigned int i; + int nr_vcpus = test_args.nr_vcpus; + + vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus); + + vm_init_descriptor_tables(vm); + vm_install_exception_handler(vm, VECTOR_IRQ_CURRENT, guest_irq_handler); + + if (!test_args.reserved) { + if (kvm_has_cap(KVM_CAP_COUNTER_OFFSET)) { + struct kvm_arm_counter_offset offset = { + .counter_offset = test_args.counter_offset, + .reserved = 0, + }; + vm_ioctl(vm, KVM_ARM_SET_COUNTER_OFFSET, &offset); + } else + TEST_FAIL("no support for global offset"); + } + + for (i = 0; i < nr_vcpus; i++) + vcpu_init_descriptor_tables(vcpus[i]); + + test_init_timer_irq(vm); + gic_fd = vgic_v3_setup(vm, nr_vcpus, 64, GICD_BASE_GPA, GICR_BASE_GPA); + __TEST_REQUIRE(gic_fd >= 0, "Failed to create vgic-v3"); + + /* Make all the test's cmdline args visible to the guest */ + sync_global_to_guest(vm, test_args); + + return vm; +} + +void test_vm_cleanup(struct kvm_vm *vm) +{ + close(gic_fd); + kvm_vm_free(vm); +} |