1 // SPDX-License-Identifier: GPL-2.0-only
6  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
18 #include <asm-generic/div64.h>
27 	mutex_lock(&vcpu->arch.exit_timing_lock);  in kvmppc_init_timing_stats()
29 	vcpu->arch.last_exit_type = 0xDEAD;  in kvmppc_init_timing_stats()
31 		vcpu->arch.timing_count_type[i] = 0;  in kvmppc_init_timing_stats()
32 		vcpu->arch.timing_max_duration[i] = 0;  in kvmppc_init_timing_stats()
33 		vcpu->arch.timing_min_duration[i] = 0xFFFFFFFF;  in kvmppc_init_timing_stats()
34 		vcpu->arch.timing_sum_duration[i] = 0;  in kvmppc_init_timing_stats()
35 		vcpu->arch.timing_sum_quad_duration[i] = 0;  in kvmppc_init_timing_stats()
37 	vcpu->arch.timing_last_exit = 0;  in kvmppc_init_timing_stats()
38 	vcpu->arch.timing_exit.tv64 = 0;  in kvmppc_init_timing_stats()
39 	vcpu->arch.timing_last_enter.tv64 = 0;  in kvmppc_init_timing_stats()
41 	mutex_unlock(&vcpu->arch.exit_timing_lock);  in kvmppc_init_timing_stats()
44 static void add_exit_timing(struct kvm_vcpu *vcpu, u64 duration, int type)  in add_exit_timing()  argument
48 	mutex_lock(&vcpu->arch.exit_timing_lock);  in add_exit_timing()
50 	vcpu->arch.timing_count_type[type]++;  in add_exit_timing()
53 	old = vcpu->arch.timing_sum_duration[type];  in add_exit_timing()
54 	vcpu->arch.timing_sum_duration[type] += duration;  in add_exit_timing()
55 	if (unlikely(old > vcpu->arch.timing_sum_duration[type])) {  in add_exit_timing()
56 		printk(KERN_ERR"%s - wrap adding sum of durations"  in add_exit_timing()
58 			__func__, old, vcpu->arch.timing_sum_duration[type],  in add_exit_timing()
59 			type, vcpu->arch.timing_count_type[type]);  in add_exit_timing()
63 	old = vcpu->arch.timing_sum_quad_duration[type];  in add_exit_timing()
64 	vcpu->arch.timing_sum_quad_duration[type] += (duration*duration);  in add_exit_timing()
65 	if (unlikely(old > vcpu->arch.timing_sum_quad_duration[type])) {  in add_exit_timing()
66 		printk(KERN_ERR"%s - wrap adding sum of squared durations"  in add_exit_timing()
69 			vcpu->arch.timing_sum_quad_duration[type],  in add_exit_timing()
70 			type, vcpu->arch.timing_count_type[type]);  in add_exit_timing()
74 	if (unlikely(duration < vcpu->arch.timing_min_duration[type]))  in add_exit_timing()
75 		vcpu->arch.timing_min_duration[type] = duration;  in add_exit_timing()
76 	if (unlikely(duration > vcpu->arch.timing_max_duration[type]))  in add_exit_timing()
77 		vcpu->arch.timing_max_duration[type] = duration;  in add_exit_timing()
79 	mutex_unlock(&vcpu->arch.exit_timing_lock);  in add_exit_timing()
84 	u64 exit = vcpu->arch.timing_last_exit;  in kvmppc_update_timing_stats()
85 	u64 enter = vcpu->arch.timing_last_enter.tv64;  in kvmppc_update_timing_stats()
88 	vcpu->arch.timing_last_exit = vcpu->arch.timing_exit.tv64;  in kvmppc_update_timing_stats()
90 	if (unlikely(vcpu->arch.last_exit_type == 0xDEAD || exit == 0))  in kvmppc_update_timing_stats()
94 	add_exit_timing(vcpu, (enter - exit), vcpu->arch.last_exit_type);  in kvmppc_update_timing_stats()
95 	/* enter -> timing_last_exit is time spent in guest - log this too */  in kvmppc_update_timing_stats()
96 	add_exit_timing(vcpu, (vcpu->arch.timing_last_exit - enter),  in kvmppc_update_timing_stats()
131 	struct kvm_vcpu *vcpu = m->private;  in kvmppc_exit_timing_show()
139 		min = vcpu->arch.timing_min_duration[i];  in kvmppc_exit_timing_show()
141 		max = vcpu->arch.timing_max_duration[i];  in kvmppc_exit_timing_show()
143 		sum = vcpu->arch.timing_sum_duration[i];  in kvmppc_exit_timing_show()
145 		sum_quad = vcpu->arch.timing_sum_quad_duration[i];  in kvmppc_exit_timing_show()
150 			vcpu->arch.timing_count_type[i],  in kvmppc_exit_timing_show()
165 	int err = -EINVAL;  in kvmppc_exit_timing_write()
173 		err = -EFAULT;  in kvmppc_exit_timing_write()
178 		struct seq_file *seqf = file->private_data;  in kvmppc_exit_timing_write()
179 		struct kvm_vcpu *vcpu = seqf->private;  in kvmppc_exit_timing_write()
183 		mutex_lock(&seqf->lock);  in kvmppc_exit_timing_write()
185 		mutex_unlock(&seqf->lock);  in kvmppc_exit_timing_write()
195 	return single_open(file, kvmppc_exit_timing_show, inode->i_private);  in kvmppc_exit_timing_open()
213 		 current->pid, id);  in kvmppc_create_vcpu_debugfs()
217 	vcpu->arch.debugfs_exit_timing = debugfs_file;  in kvmppc_create_vcpu_debugfs()
222 	debugfs_remove(vcpu->arch.debugfs_exit_timing);  in kvmppc_remove_vcpu_debugfs()
223 	vcpu->arch.debugfs_exit_timing = NULL;  in kvmppc_remove_vcpu_debugfs()