1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
11  * ktime_to_tick() - Scale ktime_t to timer tick value.
18 	return div_u64(delta * vcpu->arch.timer_mhz, MNSEC_PER_SEC);  in ktime_to_tick()
23 	return div_u64(tick * MNSEC_PER_SEC, vcpu->arch.timer_mhz);  in tick_to_ns()
33 	rcuwait_wake_up(&vcpu->wait);  in kvm_swtimer_wakeup()
43 	vcpu->arch.timer_mhz = timer_hz >> 20;  in kvm_init_timer()
46 	kvm_write_sw_gcsr(vcpu->arch.csr, LOONGARCH_CSR_TVAL, 0);  in kvm_init_timer()
55 	unsigned long ticks, delta, period;  in kvm_restore_timer()  local
57 	struct loongarch_csrs *csr = vcpu->arch.csr;  in kvm_restore_timer()
76 	 * Freeze the soft-timer and sync the guest stable timer with it.  in kvm_restore_timer()
79 		hrtimer_cancel(&vcpu->arch.swtimer);  in kvm_restore_timer()
83 	 * If oneshot timer is fired, CSR TVAL will be -1, there are two  in kvm_restore_timer()
95 		 * and set CSR TVAL with -1  in kvm_restore_timer()
101 		 * timer interrupt, and CSR TVAL keeps unchanged with -1, it  in kvm_restore_timer()
114 	expire = vcpu->arch.expire;  in kvm_restore_timer()
118 		period = cfg & CSR_TCFG_VAL;  in kvm_restore_timer()
120 		delta = period - (delta % period);  in kvm_restore_timer()
142 	struct loongarch_csrs *csr = vcpu->arch.csr;  in _kvm_save_timer()
149 	 * If period timer is fired, CSR TVAL will be reloaded from CSR TCFG  in _kvm_save_timer()
150 	 * If oneshot timer is fired, CSR TVAL will be -1  in _kvm_save_timer()
151 	 * Here judge one-shot timer fired by checking whether TVAL is larger  in _kvm_save_timer()
160 	vcpu->arch.expire = expire;  in _kvm_save_timer()
168 		hrtimer_start(&vcpu->arch.swtimer, expire, HRTIMER_MODE_ABS_PINNED_HARD);  in _kvm_save_timer()
178 	struct loongarch_csrs *csr = vcpu->arch.csr;  in kvm_save_timer()
188 	/* Save timer-related state to vCPU context */  in kvm_save_timer()