| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License, version 2, as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| * |
| * 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; |
| |
| do_div(duration, tb_ticks_per_usec); |
| if (unlikely(duration > 0xFFFFFFFF)) { |
| printk(KERN_ERR"%s - duration too big -> overflow" |
| " duration %lld type %d exit #%d\n", |
| __func__, duration, type, |
| vcpu->arch.timing_count_type[type]); |
| return; |
| } |
| |
| 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", |
| [DCR_EXITS] = "DCR", |
| [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_printf(m, "%s", "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, |
| }; |
| |
| void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id) |
| { |
| static char dbg_fname[50]; |
| struct dentry *debugfs_file; |
| |
| snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%u_timing", |
| current->pid, id); |
| debugfs_file = debugfs_create_file(dbg_fname, 0666, |
| kvm_debugfs_dir, vcpu, |
| &kvmppc_exit_timing_fops); |
| |
| if (!debugfs_file) { |
| printk(KERN_ERR"%s: error creating debugfs file %s\n", |
| __func__, dbg_fname); |
| return; |
| } |
| |
| vcpu->arch.debugfs_exit_timing = debugfs_file; |
| } |
| |
| void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu) |
| { |
| if (vcpu->arch.debugfs_exit_timing) { |
| debugfs_remove(vcpu->arch.debugfs_exit_timing); |
| vcpu->arch.debugfs_exit_timing = NULL; |
| } |
| } |