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d94d71cb | 1 | // SPDX-License-Identifier: GPL-2.0-only |
73e75b41 | 2 | /* |
73e75b41 | 3 | * |
7b701591 | 4 | * Copyright IBM Corp. 2008 |
73e75b41 HB |
5 | * |
6 | * Authors: Hollis Blanchard <hollisb@us.ibm.com> | |
7 | * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> | |
8 | */ | |
9 | ||
10 | #include <linux/kvm_host.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/seq_file.h> | |
13 | #include <linux/debugfs.h> | |
14 | #include <linux/uaccess.h> | |
e0ea8b2c | 15 | #include <linux/module.h> |
73e75b41 | 16 | |
73e75b41 HB |
17 | #include <asm/time.h> |
18 | #include <asm-generic/div64.h> | |
19 | ||
7b701591 HB |
20 | #include "timing.h" |
21 | ||
73e75b41 HB |
22 | void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu) |
23 | { | |
24 | int i; | |
25 | ||
09000adb BB |
26 | /* Take a lock to avoid concurrent updates */ |
27 | mutex_lock(&vcpu->arch.exit_timing_lock); | |
73e75b41 HB |
28 | |
29 | vcpu->arch.last_exit_type = 0xDEAD; | |
30 | for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) { | |
31 | vcpu->arch.timing_count_type[i] = 0; | |
32 | vcpu->arch.timing_max_duration[i] = 0; | |
33 | vcpu->arch.timing_min_duration[i] = 0xFFFFFFFF; | |
34 | vcpu->arch.timing_sum_duration[i] = 0; | |
35 | vcpu->arch.timing_sum_quad_duration[i] = 0; | |
36 | } | |
37 | vcpu->arch.timing_last_exit = 0; | |
38 | vcpu->arch.timing_exit.tv64 = 0; | |
39 | vcpu->arch.timing_last_enter.tv64 = 0; | |
40 | ||
09000adb | 41 | mutex_unlock(&vcpu->arch.exit_timing_lock); |
73e75b41 HB |
42 | } |
43 | ||
7b701591 | 44 | static void add_exit_timing(struct kvm_vcpu *vcpu, u64 duration, int type) |
73e75b41 HB |
45 | { |
46 | u64 old; | |
47 | ||
09000adb BB |
48 | mutex_lock(&vcpu->arch.exit_timing_lock); |
49 | ||
73e75b41 HB |
50 | vcpu->arch.timing_count_type[type]++; |
51 | ||
52 | /* sum */ | |
53 | old = vcpu->arch.timing_sum_duration[type]; | |
54 | vcpu->arch.timing_sum_duration[type] += duration; | |
55 | if (unlikely(old > vcpu->arch.timing_sum_duration[type])) { | |
56 | printk(KERN_ERR"%s - wrap adding sum of durations" | |
57 | " old %lld new %lld type %d exit # of type %d\n", | |
58 | __func__, old, vcpu->arch.timing_sum_duration[type], | |
59 | type, vcpu->arch.timing_count_type[type]); | |
60 | } | |
61 | ||
62 | /* square sum */ | |
63 | old = vcpu->arch.timing_sum_quad_duration[type]; | |
64 | vcpu->arch.timing_sum_quad_duration[type] += (duration*duration); | |
65 | if (unlikely(old > vcpu->arch.timing_sum_quad_duration[type])) { | |
66 | printk(KERN_ERR"%s - wrap adding sum of squared durations" | |
67 | " old %lld new %lld type %d exit # of type %d\n", | |
68 | __func__, old, | |
69 | vcpu->arch.timing_sum_quad_duration[type], | |
70 | type, vcpu->arch.timing_count_type[type]); | |
71 | } | |
72 | ||
73 | /* set min/max */ | |
74 | if (unlikely(duration < vcpu->arch.timing_min_duration[type])) | |
75 | vcpu->arch.timing_min_duration[type] = duration; | |
76 | if (unlikely(duration > vcpu->arch.timing_max_duration[type])) | |
77 | vcpu->arch.timing_max_duration[type] = duration; | |
09000adb BB |
78 | |
79 | mutex_unlock(&vcpu->arch.exit_timing_lock); | |
73e75b41 HB |
80 | } |
81 | ||
82 | void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu) | |
83 | { | |
84 | u64 exit = vcpu->arch.timing_last_exit; | |
85 | u64 enter = vcpu->arch.timing_last_enter.tv64; | |
86 | ||
87 | /* save exit time, used next exit when the reenter time is known */ | |
88 | vcpu->arch.timing_last_exit = vcpu->arch.timing_exit.tv64; | |
89 | ||
90 | if (unlikely(vcpu->arch.last_exit_type == 0xDEAD || exit == 0)) | |
91 | return; /* skip incomplete cycle (e.g. after reset) */ | |
92 | ||
93 | /* update statistics for average and standard deviation */ | |
94 | add_exit_timing(vcpu, (enter - exit), vcpu->arch.last_exit_type); | |
95 | /* enter -> timing_last_exit is time spent in guest - log this too */ | |
96 | add_exit_timing(vcpu, (vcpu->arch.timing_last_exit - enter), | |
97 | TIMEINGUEST); | |
98 | } | |
99 | ||
100 | static const char *kvm_exit_names[__NUMBER_OF_KVM_EXIT_TYPES] = { | |
7b701591 | 101 | [MMIO_EXITS] = "MMIO", |
7b701591 HB |
102 | [SIGNAL_EXITS] = "SIGNAL", |
103 | [ITLB_REAL_MISS_EXITS] = "ITLBREAL", | |
104 | [ITLB_VIRT_MISS_EXITS] = "ITLBVIRT", | |
105 | [DTLB_REAL_MISS_EXITS] = "DTLBREAL", | |
106 | [DTLB_VIRT_MISS_EXITS] = "DTLBVIRT", | |
107 | [SYSCALL_EXITS] = "SYSCALL", | |
108 | [ISI_EXITS] = "ISI", | |
109 | [DSI_EXITS] = "DSI", | |
110 | [EMULATED_INST_EXITS] = "EMULINST", | |
111 | [EMULATED_MTMSRWE_EXITS] = "EMUL_WAIT", | |
112 | [EMULATED_WRTEE_EXITS] = "EMUL_WRTEE", | |
113 | [EMULATED_MTSPR_EXITS] = "EMUL_MTSPR", | |
114 | [EMULATED_MFSPR_EXITS] = "EMUL_MFSPR", | |
115 | [EMULATED_MTMSR_EXITS] = "EMUL_MTMSR", | |
116 | [EMULATED_MFMSR_EXITS] = "EMUL_MFMSR", | |
117 | [EMULATED_TLBSX_EXITS] = "EMUL_TLBSX", | |
118 | [EMULATED_TLBWE_EXITS] = "EMUL_TLBWE", | |
119 | [EMULATED_RFI_EXITS] = "EMUL_RFI", | |
120 | [DEC_EXITS] = "DEC", | |
121 | [EXT_INTR_EXITS] = "EXTINT", | |
122 | [HALT_WAKEUP] = "HALT", | |
123 | [USR_PR_INST] = "USR_PR_INST", | |
124 | [FP_UNAVAIL] = "FP_UNAVAIL", | |
125 | [DEBUG_EXITS] = "DEBUG", | |
126 | [TIMEINGUEST] = "TIMEINGUEST" | |
73e75b41 HB |
127 | }; |
128 | ||
129 | static int kvmppc_exit_timing_show(struct seq_file *m, void *private) | |
130 | { | |
131 | struct kvm_vcpu *vcpu = m->private; | |
132 | int i; | |
1a040b26 | 133 | u64 min, max, sum, sum_quad; |
7b701591 | 134 | |
16273010 | 135 | seq_puts(m, "type count min max sum sum_squared\n"); |
1a040b26 | 136 | |
73e75b41 | 137 | for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) { |
1a040b26 SY |
138 | |
139 | min = vcpu->arch.timing_min_duration[i]; | |
140 | do_div(min, tb_ticks_per_usec); | |
141 | max = vcpu->arch.timing_max_duration[i]; | |
142 | do_div(max, tb_ticks_per_usec); | |
143 | sum = vcpu->arch.timing_sum_duration[i]; | |
144 | do_div(sum, tb_ticks_per_usec); | |
145 | sum_quad = vcpu->arch.timing_sum_quad_duration[i]; | |
146 | do_div(sum_quad, tb_ticks_per_usec); | |
147 | ||
7b701591 HB |
148 | seq_printf(m, "%12s %10d %10lld %10lld %20lld %20lld\n", |
149 | kvm_exit_names[i], | |
150 | vcpu->arch.timing_count_type[i], | |
1a040b26 SY |
151 | min, |
152 | max, | |
153 | sum, | |
154 | sum_quad); | |
155 | ||
73e75b41 HB |
156 | } |
157 | return 0; | |
158 | } | |
159 | ||
7b701591 | 160 | /* Write 'c' to clear the timing statistics. */ |
73e75b41 HB |
161 | static ssize_t kvmppc_exit_timing_write(struct file *file, |
162 | const char __user *user_buf, | |
163 | size_t count, loff_t *ppos) | |
164 | { | |
7b701591 | 165 | int err = -EINVAL; |
73e75b41 HB |
166 | char c; |
167 | ||
7b701591 | 168 | if (count > 1) { |
73e75b41 HB |
169 | goto done; |
170 | } | |
171 | ||
7b701591 | 172 | if (get_user(c, user_buf)) { |
73e75b41 HB |
173 | err = -EFAULT; |
174 | goto done; | |
175 | } | |
176 | ||
177 | if (c == 'c') { | |
ea01c6b4 | 178 | struct seq_file *seqf = file->private_data; |
73e75b41 | 179 | struct kvm_vcpu *vcpu = seqf->private; |
7b701591 HB |
180 | /* Write does not affect our buffers previously generated with |
181 | * show. seq_file is locked here to prevent races of init with | |
73e75b41 HB |
182 | * a show call */ |
183 | mutex_lock(&seqf->lock); | |
184 | kvmppc_init_timing_stats(vcpu); | |
185 | mutex_unlock(&seqf->lock); | |
186 | err = count; | |
73e75b41 HB |
187 | } |
188 | ||
189 | done: | |
190 | return err; | |
191 | } | |
192 | ||
193 | static int kvmppc_exit_timing_open(struct inode *inode, struct file *file) | |
194 | { | |
195 | return single_open(file, kvmppc_exit_timing_show, inode->i_private); | |
196 | } | |
197 | ||
828c0950 | 198 | static const struct file_operations kvmppc_exit_timing_fops = { |
73e75b41 HB |
199 | .owner = THIS_MODULE, |
200 | .open = kvmppc_exit_timing_open, | |
201 | .read = seq_read, | |
202 | .write = kvmppc_exit_timing_write, | |
203 | .llseek = seq_lseek, | |
204 | .release = single_release, | |
205 | }; | |
206 | ||
207 | void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id) | |
208 | { | |
209 | static char dbg_fname[50]; | |
210 | struct dentry *debugfs_file; | |
211 | ||
7b701591 | 212 | snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%u_timing", |
73e75b41 HB |
213 | current->pid, id); |
214 | debugfs_file = debugfs_create_file(dbg_fname, 0666, | |
215 | kvm_debugfs_dir, vcpu, | |
216 | &kvmppc_exit_timing_fops); | |
217 | ||
218 | if (!debugfs_file) { | |
219 | printk(KERN_ERR"%s: error creating debugfs file %s\n", | |
220 | __func__, dbg_fname); | |
221 | return; | |
222 | } | |
223 | ||
224 | vcpu->arch.debugfs_exit_timing = debugfs_file; | |
225 | } | |
226 | ||
227 | void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu) | |
228 | { | |
229 | if (vcpu->arch.debugfs_exit_timing) { | |
230 | debugfs_remove(vcpu->arch.debugfs_exit_timing); | |
231 | vcpu->arch.debugfs_exit_timing = NULL; | |
232 | } | |
233 | } |