2 * Copyright 1996 Massachusetts Institute of Technology
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29 * $FreeBSD: src/sys/i386/i386/perfmon.c,v 1.21 1999/09/25 18:24:04 phk Exp $
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/fcntl.h>
38 #include <machine/cputypes.h>
40 #include <machine/clock.h>
41 #include <machine/perfmon.h>
43 static int perfmon_inuse;
44 static int perfmon_cpuok;
46 static int msr_ctl[NPMC];
48 static int msr_pmc[NPMC];
49 static unsigned int ctl_shadow[NPMC];
50 static quad_t pmc_shadow[NPMC]; /* used when ctr is stopped on P5 */
51 static int (*writectl)(int);
53 static int writectl5(int);
54 static int writectl6(int);
57 static d_close_t perfmon_close;
58 static d_open_t perfmon_open;
59 static d_ioctl_t perfmon_ioctl;
61 #define CDEV_MAJOR 2 /* We're really a minor of mem.c */
62 static struct cdevsw perfmon_cdevsw = {
63 /* open */ perfmon_open,
64 /* close */ perfmon_close,
67 /* ioctl */ perfmon_ioctl,
70 /* strategy */ nostrategy,
80 * Must be called after cpu_class is set up.
101 writectl = writectl6;
109 make_dev(&perfmon_cdevsw, 32, UID_ROOT, GID_KMEM, 0640, "perfmon");
115 return perfmon_cpuok;
119 perfmon_setup(int pmc, unsigned int control)
121 if (pmc < 0 || pmc >= NPMC)
124 perfmon_inuse |= (1 << pmc);
125 control &= ~(PMCF_SYS_FLAGS << 16);
127 ctl_shadow[pmc] = control;
129 wrmsr(msr_pmc[pmc], pmc_shadow[pmc] = 0);
135 perfmon_get(int pmc, unsigned int *control)
137 if (pmc < 0 || pmc >= NPMC)
140 if (perfmon_inuse & (1 << pmc)) {
141 *control = ctl_shadow[pmc];
144 return EBUSY; /* XXX reversed sense */
148 perfmon_fini(int pmc)
150 if (pmc < 0 || pmc >= NPMC)
153 if (perfmon_inuse & (1 << pmc)) {
156 perfmon_inuse &= ~(1 << pmc);
159 return EBUSY; /* XXX reversed sense */
163 perfmon_start(int pmc)
165 if (pmc < 0 || pmc >= NPMC)
168 if (perfmon_inuse & (1 << pmc)) {
170 ctl_shadow[pmc] |= (PMCF_EN << 16);
171 wrmsr(msr_pmc[pmc], pmc_shadow[pmc]);
180 perfmon_stop(int pmc)
182 if (pmc < 0 || pmc >= NPMC)
185 if (perfmon_inuse & (1 << pmc)) {
187 pmc_shadow[pmc] = rdmsr(msr_pmc[pmc]) & 0xffffffffffULL;
188 ctl_shadow[pmc] &= ~(PMCF_EN << 16);
197 perfmon_read(int pmc, quad_t *val)
199 if (pmc < 0 || pmc >= NPMC)
202 if (perfmon_inuse & (1 << pmc)) {
203 if (ctl_shadow[pmc] & (PMCF_EN << 16))
204 *val = rdmsr(msr_pmc[pmc]) & 0xffffffffffULL;
206 *val = pmc_shadow[pmc];
214 perfmon_reset(int pmc)
216 if (pmc < 0 || pmc >= NPMC)
219 if (perfmon_inuse & (1 << pmc)) {
220 wrmsr(msr_pmc[pmc], pmc_shadow[pmc] = 0);
228 * Unfortunately, the performance-monitoring registers are laid out
229 * differently in the P5 and P6. We keep everything in P6 format
230 * internally (except for the event code), and convert to P5
231 * format as needed on those CPUs. The writectl function pointer
232 * is set up to point to one of these functions by perfmon_init().
237 if (pmc > 0 && !(ctl_shadow[pmc] & (PMCF_EN << 16))) {
238 wrmsr(msr_ctl[pmc], 0);
240 wrmsr(msr_ctl[pmc], ctl_shadow[pmc]);
245 #define P5FLAG_P 0x200
246 #define P5FLAG_E 0x100
247 #define P5FLAG_USR 0x80
248 #define P5FLAG_OS 0x40
255 if (ctl_shadow[1] & (PMCF_EN << 16)) {
256 if (ctl_shadow[1] & (PMCF_USR << 16))
257 newval |= P5FLAG_USR << 16;
258 if (ctl_shadow[1] & (PMCF_OS << 16))
259 newval |= P5FLAG_OS << 16;
260 if (!(ctl_shadow[1] & (PMCF_E << 16)))
261 newval |= P5FLAG_E << 16;
262 newval |= (ctl_shadow[1] & 0x3f) << 16;
264 if (ctl_shadow[0] & (PMCF_EN << 16)) {
265 if (ctl_shadow[0] & (PMCF_USR << 16))
266 newval |= P5FLAG_USR;
267 if (ctl_shadow[0] & (PMCF_OS << 16))
269 if (!(ctl_shadow[0] & (PMCF_E << 16)))
271 newval |= ctl_shadow[0] & 0x3f;
274 wrmsr(msr_ctl[0], newval);
275 return 0; /* XXX should check for unimplemented bits */
280 * Now the user-mode interface, called from a subdevice of mem.c.
283 static int writerpmc;
286 perfmon_open(dev_t dev, int flags, int fmt, struct proc *p)
291 if (flags & FWRITE) {
303 perfmon_close(dev_t dev, int flags, int fmt, struct proc *p)
305 if (flags & FWRITE) {
308 for (i = 0; i < NPMC; i++) {
309 if (writerpmc & (1 << i))
318 perfmon_ioctl(dev_t dev, u_long cmd, caddr_t param, int flags, struct proc *p)
321 struct pmc_data *pmcd;
322 struct pmc_tstamp *pmct;
328 if (!(flags & FWRITE))
330 pmc = (struct pmc *)param;
332 rv = perfmon_setup(pmc->pmc_num, pmc->pmc_val);
334 writerpmc |= (1 << pmc->pmc_num);
339 pmc = (struct pmc *)param;
340 rv = perfmon_get(pmc->pmc_num, &pmc->pmc_val);
344 if (!(flags & FWRITE))
348 rv = perfmon_start(*ip);
352 if (!(flags & FWRITE))
356 rv = perfmon_stop(*ip);
360 if (!(flags & FWRITE))
364 rv = perfmon_reset(*ip);
368 pmcd = (struct pmc_data *)param;
369 rv = perfmon_read(pmcd->pmcd_num, &pmcd->pmcd_value);
377 pmct = (struct pmc_tstamp *)param;
378 /* XXX interface loses precision. */
379 pmct->pmct_rate = tsc_freq / 1000000;
380 pmct->pmct_value = rdtsc();