Commit 4e882409 authored by Bibo Mao's avatar Bibo Mao Committed by Huacai Chen
Browse files

KVM: LoongArch: selftests: Add SW emulated timer test case 



This test case setup one-shot timer and execute idle instruction
immediately to indicate giving up CPU, hypervisor will emulate SW
hrtimer and wakeup vCPU when SW hrtimer is fired.

Signed-off-by: default avatarBibo Mao <maobibo@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent df417423

tools/testing/selftests/kvm/loongarch/arch_timer.c

+40 −0
Original line number Diff line number Diff line
@@ -9,6 +9,21 @@ 
#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;
@@ -97,6 +112,30 @@ static void guest_test_oneshot_timer(uint32_t cpu) 
	}

}



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_code(void)

{

	uint32_t cpu = guest_get_vcpuid();
@@ -105,6 +144,7 @@ static void guest_code(void) 
	local_irq_enable();

	guest_test_period_timer(cpu);

	guest_test_oneshot_timer(cpu);

	guest_test_emulate_timer(cpu);



	GUEST_DONE();

}