110 lines
2.9 KiB
C
110 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch_timer.c - Tests the riscv64 sstc timer IRQ functionality
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*
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* The test validates the sstc timer IRQs using vstimecmp registers.
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* It's ported from the aarch64 arch_timer test.
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*
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* Copyright (c) 2024, Intel Corporation.
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*/
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#include "arch_timer.h"
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#include "kvm_util.h"
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#include "processor.h"
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#include "timer_test.h"
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#include "ucall_common.h"
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static int timer_irq = IRQ_S_TIMER;
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static void guest_irq_handler(struct ex_regs *regs)
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{
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uint64_t xcnt, xcnt_diff_us, cmp;
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unsigned int intid = regs->cause & ~CAUSE_IRQ_FLAG;
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uint32_t cpu = guest_get_vcpuid();
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struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
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timer_irq_disable();
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xcnt = timer_get_cycles();
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cmp = timer_get_cmp();
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xcnt_diff_us = cycles_to_usec(xcnt - shared_data->xcnt);
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/* Make sure we are dealing with the correct timer IRQ */
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GUEST_ASSERT_EQ(intid, timer_irq);
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__GUEST_ASSERT(xcnt >= cmp,
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"xcnt = 0x%"PRIx64", cmp = 0x%"PRIx64", xcnt_diff_us = 0x%" PRIx64,
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xcnt, cmp, xcnt_diff_us);
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WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter + 1);
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}
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static void guest_run(struct test_vcpu_shared_data *shared_data)
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{
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uint32_t irq_iter, config_iter;
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shared_data->nr_iter = 0;
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shared_data->guest_stage = 0;
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for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
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/* Setup the next interrupt */
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timer_set_next_cmp_ms(test_args.timer_period_ms);
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shared_data->xcnt = timer_get_cycles();
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timer_irq_enable();
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/* Setup a timeout for the interrupt to arrive */
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udelay(msecs_to_usecs(test_args.timer_period_ms) +
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test_args.timer_err_margin_us);
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irq_iter = READ_ONCE(shared_data->nr_iter);
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__GUEST_ASSERT(config_iter + 1 == irq_iter,
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"config_iter + 1 = 0x%x, irq_iter = 0x%x.\n"
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" Guest timer interrupt was not triggered within the specified\n"
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" interval, try to increase the error margin by [-e] option.\n",
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config_iter + 1, irq_iter);
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}
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}
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static void guest_code(void)
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{
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uint32_t cpu = guest_get_vcpuid();
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struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
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timer_irq_disable();
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local_irq_enable();
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guest_run(shared_data);
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GUEST_DONE();
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}
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struct kvm_vm *test_vm_create(void)
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{
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struct kvm_vm *vm;
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int nr_vcpus = test_args.nr_vcpus;
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vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus);
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__TEST_REQUIRE(__vcpu_has_isa_ext(vcpus[0], KVM_RISCV_ISA_EXT_SSTC),
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"SSTC not available, skipping test\n");
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vm_init_vector_tables(vm);
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vm_install_interrupt_handler(vm, guest_irq_handler);
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for (int i = 0; i < nr_vcpus; i++)
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vcpu_init_vector_tables(vcpus[i]);
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/* Initialize guest timer frequency. */
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vcpu_get_reg(vcpus[0], RISCV_TIMER_REG(frequency), &timer_freq);
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sync_global_to_guest(vm, timer_freq);
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pr_debug("timer_freq: %lu\n", timer_freq);
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/* Make all the test's cmdline args visible to the guest */
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sync_global_to_guest(vm, test_args);
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return vm;
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}
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void test_vm_cleanup(struct kvm_vm *vm)
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{
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kvm_vm_free(vm);
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}
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