234 lines
6.5 KiB
C
234 lines
6.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Copyright IBM Corp. 2008
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*
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* Authors: Hollis Blanchard <hollisb@us.ibm.com>
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* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
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*/
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#include <linux/kvm_host.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <asm/time.h>
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#include <asm-generic/div64.h>
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#include "timing.h"
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void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu)
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{
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int i;
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/* Take a lock to avoid concurrent updates */
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mutex_lock(&vcpu->arch.exit_timing_lock);
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vcpu->arch.last_exit_type = 0xDEAD;
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for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
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vcpu->arch.timing_count_type[i] = 0;
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vcpu->arch.timing_max_duration[i] = 0;
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vcpu->arch.timing_min_duration[i] = 0xFFFFFFFF;
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vcpu->arch.timing_sum_duration[i] = 0;
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vcpu->arch.timing_sum_quad_duration[i] = 0;
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}
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vcpu->arch.timing_last_exit = 0;
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vcpu->arch.timing_exit.tv64 = 0;
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vcpu->arch.timing_last_enter.tv64 = 0;
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mutex_unlock(&vcpu->arch.exit_timing_lock);
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}
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static void add_exit_timing(struct kvm_vcpu *vcpu, u64 duration, int type)
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{
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u64 old;
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mutex_lock(&vcpu->arch.exit_timing_lock);
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vcpu->arch.timing_count_type[type]++;
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/* sum */
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old = vcpu->arch.timing_sum_duration[type];
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vcpu->arch.timing_sum_duration[type] += duration;
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if (unlikely(old > vcpu->arch.timing_sum_duration[type])) {
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printk(KERN_ERR"%s - wrap adding sum of durations"
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" old %lld new %lld type %d exit # of type %d\n",
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__func__, old, vcpu->arch.timing_sum_duration[type],
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type, vcpu->arch.timing_count_type[type]);
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}
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/* square sum */
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old = vcpu->arch.timing_sum_quad_duration[type];
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vcpu->arch.timing_sum_quad_duration[type] += (duration*duration);
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if (unlikely(old > vcpu->arch.timing_sum_quad_duration[type])) {
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printk(KERN_ERR"%s - wrap adding sum of squared durations"
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" old %lld new %lld type %d exit # of type %d\n",
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__func__, old,
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vcpu->arch.timing_sum_quad_duration[type],
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type, vcpu->arch.timing_count_type[type]);
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}
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/* set min/max */
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if (unlikely(duration < vcpu->arch.timing_min_duration[type]))
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vcpu->arch.timing_min_duration[type] = duration;
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if (unlikely(duration > vcpu->arch.timing_max_duration[type]))
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vcpu->arch.timing_max_duration[type] = duration;
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mutex_unlock(&vcpu->arch.exit_timing_lock);
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}
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void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu)
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{
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u64 exit = vcpu->arch.timing_last_exit;
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u64 enter = vcpu->arch.timing_last_enter.tv64;
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/* save exit time, used next exit when the reenter time is known */
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vcpu->arch.timing_last_exit = vcpu->arch.timing_exit.tv64;
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if (unlikely(vcpu->arch.last_exit_type == 0xDEAD || exit == 0))
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return; /* skip incomplete cycle (e.g. after reset) */
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/* update statistics for average and standard deviation */
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add_exit_timing(vcpu, (enter - exit), vcpu->arch.last_exit_type);
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/* enter -> timing_last_exit is time spent in guest - log this too */
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add_exit_timing(vcpu, (vcpu->arch.timing_last_exit - enter),
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TIMEINGUEST);
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}
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static const char *kvm_exit_names[__NUMBER_OF_KVM_EXIT_TYPES] = {
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[MMIO_EXITS] = "MMIO",
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[SIGNAL_EXITS] = "SIGNAL",
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[ITLB_REAL_MISS_EXITS] = "ITLBREAL",
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[ITLB_VIRT_MISS_EXITS] = "ITLBVIRT",
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[DTLB_REAL_MISS_EXITS] = "DTLBREAL",
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[DTLB_VIRT_MISS_EXITS] = "DTLBVIRT",
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[SYSCALL_EXITS] = "SYSCALL",
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[ISI_EXITS] = "ISI",
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[DSI_EXITS] = "DSI",
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[EMULATED_INST_EXITS] = "EMULINST",
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[EMULATED_MTMSRWE_EXITS] = "EMUL_WAIT",
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[EMULATED_WRTEE_EXITS] = "EMUL_WRTEE",
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[EMULATED_MTSPR_EXITS] = "EMUL_MTSPR",
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[EMULATED_MFSPR_EXITS] = "EMUL_MFSPR",
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[EMULATED_MTMSR_EXITS] = "EMUL_MTMSR",
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[EMULATED_MFMSR_EXITS] = "EMUL_MFMSR",
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[EMULATED_TLBSX_EXITS] = "EMUL_TLBSX",
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[EMULATED_TLBWE_EXITS] = "EMUL_TLBWE",
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[EMULATED_RFI_EXITS] = "EMUL_RFI",
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[DEC_EXITS] = "DEC",
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[EXT_INTR_EXITS] = "EXTINT",
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[HALT_WAKEUP] = "HALT",
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[USR_PR_INST] = "USR_PR_INST",
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[FP_UNAVAIL] = "FP_UNAVAIL",
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[DEBUG_EXITS] = "DEBUG",
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[TIMEINGUEST] = "TIMEINGUEST"
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};
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static int kvmppc_exit_timing_show(struct seq_file *m, void *private)
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{
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struct kvm_vcpu *vcpu = m->private;
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int i;
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u64 min, max, sum, sum_quad;
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seq_puts(m, "type count min max sum sum_squared\n");
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for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
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min = vcpu->arch.timing_min_duration[i];
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do_div(min, tb_ticks_per_usec);
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max = vcpu->arch.timing_max_duration[i];
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do_div(max, tb_ticks_per_usec);
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sum = vcpu->arch.timing_sum_duration[i];
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do_div(sum, tb_ticks_per_usec);
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sum_quad = vcpu->arch.timing_sum_quad_duration[i];
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do_div(sum_quad, tb_ticks_per_usec);
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seq_printf(m, "%12s %10d %10lld %10lld %20lld %20lld\n",
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kvm_exit_names[i],
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vcpu->arch.timing_count_type[i],
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min,
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max,
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sum,
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sum_quad);
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}
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return 0;
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}
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/* Write 'c' to clear the timing statistics. */
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static ssize_t kvmppc_exit_timing_write(struct file *file,
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const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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int err = -EINVAL;
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char c;
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if (count > 1) {
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goto done;
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}
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if (get_user(c, user_buf)) {
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err = -EFAULT;
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goto done;
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}
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if (c == 'c') {
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struct seq_file *seqf = file->private_data;
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struct kvm_vcpu *vcpu = seqf->private;
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/* Write does not affect our buffers previously generated with
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* show. seq_file is locked here to prevent races of init with
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* a show call */
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mutex_lock(&seqf->lock);
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kvmppc_init_timing_stats(vcpu);
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mutex_unlock(&seqf->lock);
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err = count;
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}
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done:
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return err;
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}
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static int kvmppc_exit_timing_open(struct inode *inode, struct file *file)
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{
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return single_open(file, kvmppc_exit_timing_show, inode->i_private);
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}
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static const struct file_operations kvmppc_exit_timing_fops = {
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.owner = THIS_MODULE,
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.open = kvmppc_exit_timing_open,
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.read = seq_read,
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.write = kvmppc_exit_timing_write,
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.llseek = seq_lseek,
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.release = single_release,
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};
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void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id)
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{
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static char dbg_fname[50];
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struct dentry *debugfs_file;
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snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%u_timing",
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current->pid, id);
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debugfs_file = debugfs_create_file(dbg_fname, 0666,
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kvm_debugfs_dir, vcpu,
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&kvmppc_exit_timing_fops);
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if (!debugfs_file) {
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printk(KERN_ERR"%s: error creating debugfs file %s\n",
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__func__, dbg_fname);
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return;
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}
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vcpu->arch.debugfs_exit_timing = debugfs_file;
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}
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void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu)
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{
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if (vcpu->arch.debugfs_exit_timing) {
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debugfs_remove(vcpu->arch.debugfs_exit_timing);
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vcpu->arch.debugfs_exit_timing = NULL;
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}
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}
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