1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * arch_timer.c - Tests the riscv64 sstc timer IRQ functionality 4 * 5 * The test validates the sstc timer IRQs using vstimecmp registers. 6 * It's ported from the aarch64 arch_timer test. 7 * 8 * Copyright (c) 2024, Intel Corporation. 9 */ 10 #include "arch_timer.h" 11 #include "kvm_util.h" 12 #include "processor.h" 13 #include "timer_test.h" 14 #include "ucall_common.h" 15 16 static int timer_irq = IRQ_S_TIMER; 17 18 static void guest_irq_handler(struct ex_regs *regs) 19 { 20 uint64_t xcnt, xcnt_diff_us, cmp; 21 unsigned int intid = regs->cause & ~CAUSE_IRQ_FLAG; 22 uint32_t cpu = guest_get_vcpuid(); 23 struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu]; 24 25 timer_irq_disable(); 26 27 xcnt = timer_get_cycles(); 28 cmp = timer_get_cmp(); 29 xcnt_diff_us = cycles_to_usec(xcnt - shared_data->xcnt); 30 31 /* Make sure we are dealing with the correct timer IRQ */ 32 GUEST_ASSERT_EQ(intid, timer_irq); 33 34 __GUEST_ASSERT(xcnt >= cmp, 35 "xcnt = 0x%"PRIx64", cmp = 0x%"PRIx64", xcnt_diff_us = 0x%" PRIx64, 36 xcnt, cmp, xcnt_diff_us); 37 38 WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter + 1); 39 } 40 41 static void guest_run(struct test_vcpu_shared_data *shared_data) 42 { 43 uint32_t irq_iter, config_iter; 44 45 shared_data->nr_iter = 0; 46 shared_data->guest_stage = 0; 47 48 for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) { 49 /* Setup the next interrupt */ 50 timer_set_next_cmp_ms(test_args.timer_period_ms); 51 shared_data->xcnt = timer_get_cycles(); 52 timer_irq_enable(); 53 54 /* Setup a timeout for the interrupt to arrive */ 55 udelay(msecs_to_usecs(test_args.timer_period_ms) + 56 test_args.timer_err_margin_us); 57 58 irq_iter = READ_ONCE(shared_data->nr_iter); 59 __GUEST_ASSERT(config_iter + 1 == irq_iter, 60 "config_iter + 1 = 0x%x, irq_iter = 0x%x.\n" 61 " Guest timer interrupt was not triggered within the specified\n" 62 " interval, try to increase the error margin by [-e] option.\n", 63 config_iter + 1, irq_iter); 64 } 65 } 66 67 static void guest_code(void) 68 { 69 uint32_t cpu = guest_get_vcpuid(); 70 struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu]; 71 72 timer_irq_disable(); 73 local_irq_enable(); 74 75 guest_run(shared_data); 76 77 GUEST_DONE(); 78 } 79 80 struct kvm_vm *test_vm_create(void) 81 { 82 struct kvm_vm *vm; 83 int nr_vcpus = test_args.nr_vcpus; 84 85 vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus); 86 __TEST_REQUIRE(__vcpu_has_isa_ext(vcpus[0], KVM_RISCV_ISA_EXT_SSTC), 87 "SSTC not available, skipping test\n"); 88 89 vm_init_vector_tables(vm); 90 vm_install_interrupt_handler(vm, guest_irq_handler); 91 92 for (int i = 0; i < nr_vcpus; i++) 93 vcpu_init_vector_tables(vcpus[i]); 94 95 /* Initialize guest timer frequency. */ 96 vcpu_get_reg(vcpus[0], RISCV_TIMER_REG(frequency), &timer_freq); 97 sync_global_to_guest(vm, timer_freq); 98 pr_debug("timer_freq: %lu\n", timer_freq); 99 100 /* Make all the test's cmdline args visible to the guest */ 101 sync_global_to_guest(vm, test_args); 102 103 return vm; 104 } 105 106 void test_vm_cleanup(struct kvm_vm *vm) 107 { 108 kvm_vm_free(vm); 109 } 110