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// SPDX-License-Identifier: GPL-2.0-only
/*
* The test validates periodic/one-shot constant timer IRQ using
* CSR.TCFG and CSR.TVAL registers.
*/
#include "arch_timer.h"
#include "kvm_util.h"
#include "processor.h"
#include "timer_test.h"
#include "ucall_common.h"
static void do_idle(void)
{
unsigned int intid;
unsigned long estat;
__asm__ __volatile__("idle 0" : : : "memory");
estat = csr_read(LOONGARCH_CSR_ESTAT);
intid = !!(estat & BIT(INT_TI));
/* Make sure pending timer IRQ arrived */
GUEST_ASSERT_EQ(intid, 1);
csr_write(CSR_TINTCLR_TI, LOONGARCH_CSR_TINTCLR);
}
static void guest_irq_handler(struct ex_regs *regs)
{
unsigned int intid;
uint32_t cpu = guest_get_vcpuid();
uint64_t xcnt, val, cfg, xcnt_diff_us;
struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
intid = !!(regs->estat & BIT(INT_TI));
/* Make sure we are dealing with the correct timer IRQ */
GUEST_ASSERT_EQ(intid, 1);
cfg = timer_get_cfg();
if (cfg & CSR_TCFG_PERIOD) {
WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter - 1);
if (shared_data->nr_iter == 0)
disable_timer();
csr_write(CSR_TINTCLR_TI, LOONGARCH_CSR_TINTCLR);
return;
}
/*
* On real machine, value of LOONGARCH_CSR_TVAL is BIT_ULL(48) - 1
* On virtual machine, its value counts down from BIT_ULL(48) - 1
*/
val = timer_get_val();
xcnt = timer_get_cycles();
xcnt_diff_us = cycles_to_usec(xcnt - shared_data->xcnt);
/* Basic 'timer condition met' check */
__GUEST_ASSERT(val > cfg,
"val = 0x%lx, cfg = 0x%lx, xcnt_diff_us = 0x%lx",
val, cfg, xcnt_diff_us);
csr_write(CSR_TINTCLR_TI, LOONGARCH_CSR_TINTCLR);
WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter + 1);
}
static void guest_test_period_timer(uint32_t cpu)
{
uint32_t irq_iter, config_iter;
uint64_t us;
struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
shared_data->nr_iter = test_args.nr_iter;
shared_data->xcnt = timer_get_cycles();
us = msecs_to_usecs(test_args.timer_period_ms) + test_args.timer_err_margin_us;
timer_set_next_cmp_ms(test_args.timer_period_ms, true);
for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
/* Setup a timeout for the interrupt to arrive */
udelay(us);
}
irq_iter = READ_ONCE(shared_data->nr_iter);
__GUEST_ASSERT(irq_iter == 0,
"irq_iter = 0x%x.\n"
" Guest period timer interrupt was not triggered within the specified\n"
" interval, try to increase the error margin by [-e] option.\n",
irq_iter);
}
static void guest_test_oneshot_timer(uint32_t cpu)
{
uint32_t irq_iter, config_iter;
uint64_t us;
struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
shared_data->nr_iter = 0;
shared_data->guest_stage = 0;
us = msecs_to_usecs(test_args.timer_period_ms) + test_args.timer_err_margin_us;
for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
shared_data->xcnt = timer_get_cycles();
/* Setup the next interrupt */
timer_set_next_cmp_ms(test_args.timer_period_ms, false);
/* Setup a timeout for the interrupt to arrive */
udelay(us);
irq_iter = READ_ONCE(shared_data->nr_iter);
__GUEST_ASSERT(config_iter + 1 == irq_iter,
"config_iter + 1 = 0x%x, irq_iter = 0x%x.\n"
" Guest timer interrupt was not triggered within the specified\n"
" interval, try to increase the error margin by [-e] option.\n",
config_iter + 1, irq_iter);
}
}
static void guest_test_emulate_timer(uint32_t cpu)
{
uint32_t config_iter;
uint64_t xcnt_diff_us, us;
struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
local_irq_disable();
shared_data->nr_iter = 0;
us = msecs_to_usecs(test_args.timer_period_ms);
for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
shared_data->xcnt = timer_get_cycles();
/* Setup the next interrupt */
timer_set_next_cmp_ms(test_args.timer_period_ms, false);
do_idle();
xcnt_diff_us = cycles_to_usec(timer_get_cycles() - shared_data->xcnt);
__GUEST_ASSERT(xcnt_diff_us >= us,
"xcnt_diff_us = 0x%lx, us = 0x%lx.\n",
xcnt_diff_us, us);
}
local_irq_enable();
}
static void guest_time_count_test(uint32_t cpu)
{
uint32_t config_iter;
unsigned long start, end, prev, us;
/* Assuming that test case starts to run in 1 second */
start = timer_get_cycles();
us = msec_to_cycles(1000);
__GUEST_ASSERT(start <= us,
"start = 0x%lx, us = 0x%lx.\n",
start, us);
us = msec_to_cycles(test_args.timer_period_ms);
for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
start = timer_get_cycles();
end = start + us;
/* test time count growing up always */
while (start < end) {
prev = start;
start = timer_get_cycles();
__GUEST_ASSERT(prev <= start,
"prev = 0x%lx, start = 0x%lx.\n",
prev, start);
}
}
}
static void guest_code(void)
{
uint32_t cpu = guest_get_vcpuid();
/* must run at first */
guest_time_count_test(cpu);
timer_irq_enable();
local_irq_enable();
guest_test_period_timer(cpu);
guest_test_oneshot_timer(cpu);
guest_test_emulate_timer(cpu);
GUEST_DONE();
}
struct kvm_vm *test_vm_create(void)
{
struct kvm_vm *vm;
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, EXCCODE_INT, guest_irq_handler);
/* 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)
{
kvm_vm_free(vm);
}
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