KVM: PPC: Name generic 64-bit code generic
[linux-2.6.git] / arch / powerpc / kvm / timing.c
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License, version 2, as
4  * published by the Free Software Foundation.
5  *
6  * This program is distributed in the hope that it will be useful,
7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9  * GNU General Public License for more details.
10  *
11  * You should have received a copy of the GNU General Public License
12  * along with this program; if not, write to the Free Software
13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
14  *
15  * Copyright IBM Corp. 2008
16  *
17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
18  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
19  */
20
21 #include <linux/kvm_host.h>
22 #include <linux/fs.h>
23 #include <linux/seq_file.h>
24 #include <linux/debugfs.h>
25 #include <linux/uaccess.h>
26 #include <linux/module.h>
27
28 #include <asm/time.h>
29 #include <asm-generic/div64.h>
30
31 #include "timing.h"
32
33 void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu)
34 {
35         int i;
36
37         /* pause guest execution to avoid concurrent updates */
38         local_irq_disable();
39         mutex_lock(&vcpu->mutex);
40
41         vcpu->arch.last_exit_type = 0xDEAD;
42         for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
43                 vcpu->arch.timing_count_type[i] = 0;
44                 vcpu->arch.timing_max_duration[i] = 0;
45                 vcpu->arch.timing_min_duration[i] = 0xFFFFFFFF;
46                 vcpu->arch.timing_sum_duration[i] = 0;
47                 vcpu->arch.timing_sum_quad_duration[i] = 0;
48         }
49         vcpu->arch.timing_last_exit = 0;
50         vcpu->arch.timing_exit.tv64 = 0;
51         vcpu->arch.timing_last_enter.tv64 = 0;
52
53         mutex_unlock(&vcpu->mutex);
54         local_irq_enable();
55 }
56
57 static void add_exit_timing(struct kvm_vcpu *vcpu, u64 duration, int type)
58 {
59         u64 old;
60
61         do_div(duration, tb_ticks_per_usec);
62         if (unlikely(duration > 0xFFFFFFFF)) {
63                 printk(KERN_ERR"%s - duration too big -> overflow"
64                         " duration %lld type %d exit #%d\n",
65                         __func__, duration, type,
66                         vcpu->arch.timing_count_type[type]);
67                 return;
68         }
69
70         vcpu->arch.timing_count_type[type]++;
71
72         /* sum */
73         old = vcpu->arch.timing_sum_duration[type];
74         vcpu->arch.timing_sum_duration[type] += duration;
75         if (unlikely(old > vcpu->arch.timing_sum_duration[type])) {
76                 printk(KERN_ERR"%s - wrap adding sum of durations"
77                         " old %lld new %lld type %d exit # of type %d\n",
78                         __func__, old, vcpu->arch.timing_sum_duration[type],
79                         type, vcpu->arch.timing_count_type[type]);
80         }
81
82         /* square sum */
83         old = vcpu->arch.timing_sum_quad_duration[type];
84         vcpu->arch.timing_sum_quad_duration[type] += (duration*duration);
85         if (unlikely(old > vcpu->arch.timing_sum_quad_duration[type])) {
86                 printk(KERN_ERR"%s - wrap adding sum of squared durations"
87                         " old %lld new %lld type %d exit # of type %d\n",
88                         __func__, old,
89                         vcpu->arch.timing_sum_quad_duration[type],
90                         type, vcpu->arch.timing_count_type[type]);
91         }
92
93         /* set min/max */
94         if (unlikely(duration < vcpu->arch.timing_min_duration[type]))
95                 vcpu->arch.timing_min_duration[type] = duration;
96         if (unlikely(duration > vcpu->arch.timing_max_duration[type]))
97                 vcpu->arch.timing_max_duration[type] = duration;
98 }
99
100 void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu)
101 {
102         u64 exit = vcpu->arch.timing_last_exit;
103         u64 enter = vcpu->arch.timing_last_enter.tv64;
104
105         /* save exit time, used next exit when the reenter time is known */
106         vcpu->arch.timing_last_exit = vcpu->arch.timing_exit.tv64;
107
108         if (unlikely(vcpu->arch.last_exit_type == 0xDEAD || exit == 0))
109                 return; /* skip incomplete cycle (e.g. after reset) */
110
111         /* update statistics for average and standard deviation */
112         add_exit_timing(vcpu, (enter - exit), vcpu->arch.last_exit_type);
113         /* enter -> timing_last_exit is time spent in guest - log this too */
114         add_exit_timing(vcpu, (vcpu->arch.timing_last_exit - enter),
115                         TIMEINGUEST);
116 }
117
118 static const char *kvm_exit_names[__NUMBER_OF_KVM_EXIT_TYPES] = {
119         [MMIO_EXITS] =              "MMIO",
120         [DCR_EXITS] =               "DCR",
121         [SIGNAL_EXITS] =            "SIGNAL",
122         [ITLB_REAL_MISS_EXITS] =    "ITLBREAL",
123         [ITLB_VIRT_MISS_EXITS] =    "ITLBVIRT",
124         [DTLB_REAL_MISS_EXITS] =    "DTLBREAL",
125         [DTLB_VIRT_MISS_EXITS] =    "DTLBVIRT",
126         [SYSCALL_EXITS] =           "SYSCALL",
127         [ISI_EXITS] =               "ISI",
128         [DSI_EXITS] =               "DSI",
129         [EMULATED_INST_EXITS] =     "EMULINST",
130         [EMULATED_MTMSRWE_EXITS] =  "EMUL_WAIT",
131         [EMULATED_WRTEE_EXITS] =    "EMUL_WRTEE",
132         [EMULATED_MTSPR_EXITS] =    "EMUL_MTSPR",
133         [EMULATED_MFSPR_EXITS] =    "EMUL_MFSPR",
134         [EMULATED_MTMSR_EXITS] =    "EMUL_MTMSR",
135         [EMULATED_MFMSR_EXITS] =    "EMUL_MFMSR",
136         [EMULATED_TLBSX_EXITS] =    "EMUL_TLBSX",
137         [EMULATED_TLBWE_EXITS] =    "EMUL_TLBWE",
138         [EMULATED_RFI_EXITS] =      "EMUL_RFI",
139         [DEC_EXITS] =               "DEC",
140         [EXT_INTR_EXITS] =          "EXTINT",
141         [HALT_WAKEUP] =             "HALT",
142         [USR_PR_INST] =             "USR_PR_INST",
143         [FP_UNAVAIL] =              "FP_UNAVAIL",
144         [DEBUG_EXITS] =             "DEBUG",
145         [TIMEINGUEST] =             "TIMEINGUEST"
146 };
147
148 static int kvmppc_exit_timing_show(struct seq_file *m, void *private)
149 {
150         struct kvm_vcpu *vcpu = m->private;
151         int i;
152
153         seq_printf(m, "%s", "type       count   min     max     sum     sum_squared\n");
154
155         for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
156                 seq_printf(m, "%12s     %10d    %10lld  %10lld  %20lld  %20lld\n",
157                         kvm_exit_names[i],
158                         vcpu->arch.timing_count_type[i],
159                         vcpu->arch.timing_min_duration[i],
160                         vcpu->arch.timing_max_duration[i],
161                         vcpu->arch.timing_sum_duration[i],
162                         vcpu->arch.timing_sum_quad_duration[i]);
163         }
164         return 0;
165 }
166
167 /* Write 'c' to clear the timing statistics. */
168 static ssize_t kvmppc_exit_timing_write(struct file *file,
169                                        const char __user *user_buf,
170                                        size_t count, loff_t *ppos)
171 {
172         int err = -EINVAL;
173         char c;
174
175         if (count > 1) {
176                 goto done;
177         }
178
179         if (get_user(c, user_buf)) {
180                 err = -EFAULT;
181                 goto done;
182         }
183
184         if (c == 'c') {
185                 struct seq_file *seqf = (struct seq_file *)file->private_data;
186                 struct kvm_vcpu *vcpu = seqf->private;
187                 /* Write does not affect our buffers previously generated with
188                  * show. seq_file is locked here to prevent races of init with
189                  * a show call */
190                 mutex_lock(&seqf->lock);
191                 kvmppc_init_timing_stats(vcpu);
192                 mutex_unlock(&seqf->lock);
193                 err = count;
194         }
195
196 done:
197         return err;
198 }
199
200 static int kvmppc_exit_timing_open(struct inode *inode, struct file *file)
201 {
202         return single_open(file, kvmppc_exit_timing_show, inode->i_private);
203 }
204
205 static const struct file_operations kvmppc_exit_timing_fops = {
206         .owner   = THIS_MODULE,
207         .open    = kvmppc_exit_timing_open,
208         .read    = seq_read,
209         .write   = kvmppc_exit_timing_write,
210         .llseek  = seq_lseek,
211         .release = single_release,
212 };
213
214 void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id)
215 {
216         static char dbg_fname[50];
217         struct dentry *debugfs_file;
218
219         snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%u_timing",
220                  current->pid, id);
221         debugfs_file = debugfs_create_file(dbg_fname, 0666,
222                                         kvm_debugfs_dir, vcpu,
223                                         &kvmppc_exit_timing_fops);
224
225         if (!debugfs_file) {
226                 printk(KERN_ERR"%s: error creating debugfs file %s\n",
227                         __func__, dbg_fname);
228                 return;
229         }
230
231         vcpu->arch.debugfs_exit_timing = debugfs_file;
232 }
233
234 void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu)
235 {
236         if (vcpu->arch.debugfs_exit_timing) {
237                 debugfs_remove(vcpu->arch.debugfs_exit_timing);
238                 vcpu->arch.debugfs_exit_timing = NULL;
239         }
240 }