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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | // SPDX-License-Identifier: GPL-2.0-only /* * * Copyright IBM Corp. 2008 * * Authors: Hollis Blanchard <hollisb@us.ibm.com> * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> */ #include <linux/kvm_host.h> #include <linux/fs.h> #include <linux/seq_file.h> #include <linux/debugfs.h> #include <linux/uaccess.h> #include <linux/module.h> #include <asm/time.h> #include <asm-generic/div64.h> #include "timing.h" void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu) { int i; /* Take a lock to avoid concurrent updates */ mutex_lock(&vcpu->arch.exit_timing_lock); vcpu->arch.last_exit_type = 0xDEAD; for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) { vcpu->arch.timing_count_type[i] = 0; vcpu->arch.timing_max_duration[i] = 0; vcpu->arch.timing_min_duration[i] = 0xFFFFFFFF; vcpu->arch.timing_sum_duration[i] = 0; vcpu->arch.timing_sum_quad_duration[i] = 0; } vcpu->arch.timing_last_exit = 0; vcpu->arch.timing_exit.tv64 = 0; vcpu->arch.timing_last_enter.tv64 = 0; mutex_unlock(&vcpu->arch.exit_timing_lock); } static void add_exit_timing(struct kvm_vcpu *vcpu, u64 duration, int type) { u64 old; mutex_lock(&vcpu->arch.exit_timing_lock); vcpu->arch.timing_count_type[type]++; /* sum */ old = vcpu->arch.timing_sum_duration[type]; vcpu->arch.timing_sum_duration[type] += duration; if (unlikely(old > vcpu->arch.timing_sum_duration[type])) { printk(KERN_ERR"%s - wrap adding sum of durations" " old %lld new %lld type %d exit # of type %d\n", __func__, old, vcpu->arch.timing_sum_duration[type], type, vcpu->arch.timing_count_type[type]); } /* square sum */ old = vcpu->arch.timing_sum_quad_duration[type]; vcpu->arch.timing_sum_quad_duration[type] += (duration*duration); if (unlikely(old > vcpu->arch.timing_sum_quad_duration[type])) { printk(KERN_ERR"%s - wrap adding sum of squared durations" " old %lld new %lld type %d exit # of type %d\n", __func__, old, vcpu->arch.timing_sum_quad_duration[type], type, vcpu->arch.timing_count_type[type]); } /* set min/max */ if (unlikely(duration < vcpu->arch.timing_min_duration[type])) vcpu->arch.timing_min_duration[type] = duration; if (unlikely(duration > vcpu->arch.timing_max_duration[type])) vcpu->arch.timing_max_duration[type] = duration; mutex_unlock(&vcpu->arch.exit_timing_lock); } void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu) { u64 exit = vcpu->arch.timing_last_exit; u64 enter = vcpu->arch.timing_last_enter.tv64; /* save exit time, used next exit when the reenter time is known */ vcpu->arch.timing_last_exit = vcpu->arch.timing_exit.tv64; if (unlikely(vcpu->arch.last_exit_type == 0xDEAD || exit == 0)) return; /* skip incomplete cycle (e.g. after reset) */ /* update statistics for average and standard deviation */ add_exit_timing(vcpu, (enter - exit), vcpu->arch.last_exit_type); /* enter -> timing_last_exit is time spent in guest - log this too */ add_exit_timing(vcpu, (vcpu->arch.timing_last_exit - enter), TIMEINGUEST); } static const char *kvm_exit_names[__NUMBER_OF_KVM_EXIT_TYPES] = { [MMIO_EXITS] = "MMIO", [SIGNAL_EXITS] = "SIGNAL", [ITLB_REAL_MISS_EXITS] = "ITLBREAL", [ITLB_VIRT_MISS_EXITS] = "ITLBVIRT", [DTLB_REAL_MISS_EXITS] = "DTLBREAL", [DTLB_VIRT_MISS_EXITS] = "DTLBVIRT", [SYSCALL_EXITS] = "SYSCALL", [ISI_EXITS] = "ISI", [DSI_EXITS] = "DSI", [EMULATED_INST_EXITS] = "EMULINST", [EMULATED_MTMSRWE_EXITS] = "EMUL_WAIT", [EMULATED_WRTEE_EXITS] = "EMUL_WRTEE", [EMULATED_MTSPR_EXITS] = "EMUL_MTSPR", [EMULATED_MFSPR_EXITS] = "EMUL_MFSPR", [EMULATED_MTMSR_EXITS] = "EMUL_MTMSR", [EMULATED_MFMSR_EXITS] = "EMUL_MFMSR", [EMULATED_TLBSX_EXITS] = "EMUL_TLBSX", [EMULATED_TLBWE_EXITS] = "EMUL_TLBWE", [EMULATED_RFI_EXITS] = "EMUL_RFI", [DEC_EXITS] = "DEC", [EXT_INTR_EXITS] = "EXTINT", [HALT_WAKEUP] = "HALT", [USR_PR_INST] = "USR_PR_INST", [FP_UNAVAIL] = "FP_UNAVAIL", [DEBUG_EXITS] = "DEBUG", [TIMEINGUEST] = "TIMEINGUEST" }; static int kvmppc_exit_timing_show(struct seq_file *m, void *private) { struct kvm_vcpu *vcpu = m->private; int i; u64 min, max, sum, sum_quad; seq_puts(m, "type count min max sum sum_squared\n"); for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) { min = vcpu->arch.timing_min_duration[i]; do_div(min, tb_ticks_per_usec); max = vcpu->arch.timing_max_duration[i]; do_div(max, tb_ticks_per_usec); sum = vcpu->arch.timing_sum_duration[i]; do_div(sum, tb_ticks_per_usec); sum_quad = vcpu->arch.timing_sum_quad_duration[i]; do_div(sum_quad, tb_ticks_per_usec); seq_printf(m, "%12s %10d %10lld %10lld %20lld %20lld\n", kvm_exit_names[i], vcpu->arch.timing_count_type[i], min, max, sum, sum_quad); } return 0; } /* Write 'c' to clear the timing statistics. */ static ssize_t kvmppc_exit_timing_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { int err = -EINVAL; char c; if (count > 1) { goto done; } if (get_user(c, user_buf)) { err = -EFAULT; goto done; } if (c == 'c') { struct seq_file *seqf = file->private_data; struct kvm_vcpu *vcpu = seqf->private; /* Write does not affect our buffers previously generated with * show. seq_file is locked here to prevent races of init with * a show call */ mutex_lock(&seqf->lock); kvmppc_init_timing_stats(vcpu); mutex_unlock(&seqf->lock); err = count; } done: return err; } static int kvmppc_exit_timing_open(struct inode *inode, struct file *file) { return single_open(file, kvmppc_exit_timing_show, inode->i_private); } static const struct file_operations kvmppc_exit_timing_fops = { .owner = THIS_MODULE, .open = kvmppc_exit_timing_open, .read = seq_read, .write = kvmppc_exit_timing_write, .llseek = seq_lseek, .release = single_release, }; int kvmppc_create_vcpu_debugfs_e500(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) { debugfs_create_file("timing", 0666, debugfs_dentry, vcpu, &kvmppc_exit_timing_fops); return 0; } |