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// 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);
}
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