xref: /freebsd/sys/dev/hwpmc/hwpmc_soft.c (revision 69e6d7b75e96c406d072cb83ffc9b26fbf1a86fb)
1 /*-
2  * Copyright (c) 2012 Fabien Thomas
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/param.h>
31 #include <sys/pmc.h>
32 #include <sys/pmckern.h>
33 #include <sys/systm.h>
34 #include <sys/mutex.h>
35 
36 #include <machine/cpu.h>
37 #include <machine/cpufunc.h>
38 
39 #include "hwpmc_soft.h"
40 
41 /*
42  * Software PMC support.
43  */
44 
45 #define	SOFT_CAPS (PMC_CAP_READ | PMC_CAP_WRITE | PMC_CAP_INTERRUPT | \
46     PMC_CAP_USER | PMC_CAP_SYSTEM)
47 
48 struct soft_descr {
49 	struct pmc_descr pm_descr;  /* "base class" */
50 };
51 
52 static struct soft_descr soft_pmcdesc[SOFT_NPMCS] =
53 {
54 #define	SOFT_PMCDESCR(N)				\
55 	{						\
56 		.pm_descr =				\
57 		{					\
58 			.pd_name = #N,			\
59 			.pd_class = PMC_CLASS_SOFT,	\
60 			.pd_caps = SOFT_CAPS,		\
61 			.pd_width = 64			\
62 		},					\
63 	}
64 
65 	SOFT_PMCDESCR(SOFT0),
66 	SOFT_PMCDESCR(SOFT1),
67 	SOFT_PMCDESCR(SOFT2),
68 	SOFT_PMCDESCR(SOFT3),
69 	SOFT_PMCDESCR(SOFT4),
70 	SOFT_PMCDESCR(SOFT5),
71 	SOFT_PMCDESCR(SOFT6),
72 	SOFT_PMCDESCR(SOFT7),
73 	SOFT_PMCDESCR(SOFT8),
74 	SOFT_PMCDESCR(SOFT9),
75 	SOFT_PMCDESCR(SOFT10),
76 	SOFT_PMCDESCR(SOFT11),
77 	SOFT_PMCDESCR(SOFT12),
78 	SOFT_PMCDESCR(SOFT13),
79 	SOFT_PMCDESCR(SOFT14),
80 	SOFT_PMCDESCR(SOFT15)
81 };
82 
83 /*
84  * Per-CPU data structure.
85  */
86 
87 struct soft_cpu {
88 	struct pmc_hw	soft_hw[SOFT_NPMCS];
89 	pmc_value_t	soft_values[SOFT_NPMCS];
90 };
91 
92 
93 static struct soft_cpu **soft_pcpu;
94 
95 static int
96 soft_allocate_pmc(int cpu, int ri, struct pmc *pm,
97     const struct pmc_op_pmcallocate *a)
98 {
99 	enum pmc_event ev;
100 	struct pmc_soft *ps;
101 
102 	(void) cpu;
103 
104 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
105 	    ("[soft,%d] illegal CPU value %d", __LINE__, cpu));
106 	KASSERT(ri >= 0 && ri < SOFT_NPMCS,
107 	    ("[soft,%d] illegal row-index %d", __LINE__, ri));
108 
109 	if (a->pm_class != PMC_CLASS_SOFT)
110 		return (EINVAL);
111 
112 	if ((pm->pm_caps & SOFT_CAPS) == 0)
113 		return (EINVAL);
114 
115 	if ((pm->pm_caps & ~SOFT_CAPS) != 0)
116 		return (EPERM);
117 
118 	ev = pm->pm_event;
119 	if ((int)ev < PMC_EV_SOFT_FIRST || (int)ev > PMC_EV_SOFT_LAST)
120 		return (EINVAL);
121 
122 	/* Check if event is registered. */
123 	ps = pmc_soft_ev_acquire(ev);
124 	if (ps == NULL)
125 		return (EINVAL);
126 	pmc_soft_ev_release(ps);
127 	/* Module unload is protected by pmc SX lock. */
128 	if (ps->ps_alloc != NULL)
129 		ps->ps_alloc();
130 
131 	return (0);
132 }
133 
134 static int
135 soft_config_pmc(int cpu, int ri, struct pmc *pm)
136 {
137 	struct pmc_hw *phw;
138 
139 	PMCDBG(MDP,CFG,1, "cpu=%d ri=%d pm=%p", cpu, ri, pm);
140 
141 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
142 	    ("[soft,%d] illegal CPU value %d", __LINE__, cpu));
143 	KASSERT(ri >= 0 && ri < SOFT_NPMCS,
144 	    ("[soft,%d] illegal row-index %d", __LINE__, ri));
145 
146 	phw = &soft_pcpu[cpu]->soft_hw[ri];
147 
148 	KASSERT(pm == NULL || phw->phw_pmc == NULL,
149 	    ("[soft,%d] pm=%p phw->pm=%p hwpmc not unconfigured", __LINE__,
150 	    pm, phw->phw_pmc));
151 
152 	phw->phw_pmc = pm;
153 
154 	return (0);
155 }
156 
157 static int
158 soft_describe(int cpu, int ri, struct pmc_info *pi, struct pmc **ppmc)
159 {
160 	int error;
161 	size_t copied;
162 	const struct soft_descr *pd;
163 	struct pmc_hw *phw;
164 
165 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
166 	    ("[soft,%d] illegal CPU %d", __LINE__, cpu));
167 	KASSERT(ri >= 0 && ri < SOFT_NPMCS,
168 	    ("[soft,%d] illegal row-index %d", __LINE__, ri));
169 
170 	phw = &soft_pcpu[cpu]->soft_hw[ri];
171 	pd  = &soft_pmcdesc[ri];
172 
173 	if ((error = copystr(pd->pm_descr.pd_name, pi->pm_name,
174 	    PMC_NAME_MAX, &copied)) != 0)
175 		return (error);
176 
177 	pi->pm_class = pd->pm_descr.pd_class;
178 
179 	if (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) {
180 		pi->pm_enabled = TRUE;
181 		*ppmc          = phw->phw_pmc;
182 	} else {
183 		pi->pm_enabled = FALSE;
184 		*ppmc          = NULL;
185 	}
186 
187 	return (0);
188 }
189 
190 static int
191 soft_get_config(int cpu, int ri, struct pmc **ppm)
192 {
193 	(void) ri;
194 
195 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
196 	    ("[soft,%d] illegal CPU %d", __LINE__, cpu));
197 	KASSERT(ri >= 0 && ri < SOFT_NPMCS,
198 	    ("[soft,%d] illegal row-index %d", __LINE__, ri));
199 
200 	*ppm = soft_pcpu[cpu]->soft_hw[ri].phw_pmc;
201 	return (0);
202 }
203 
204 static int
205 soft_pcpu_fini(struct pmc_mdep *md, int cpu)
206 {
207 	int ri;
208 	struct pmc_cpu *pc;
209 
210 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
211 	    ("[soft,%d] illegal cpu %d", __LINE__, cpu));
212 	KASSERT(soft_pcpu[cpu] != NULL, ("[soft,%d] null pcpu", __LINE__));
213 
214 	free(soft_pcpu[cpu], M_PMC);
215 	soft_pcpu[cpu] = NULL;
216 
217 	ri = md->pmd_classdep[PMC_CLASS_INDEX_SOFT].pcd_ri;
218 
219 	KASSERT(ri >= 0 && ri < SOFT_NPMCS,
220 	    ("[soft,%d] ri=%d", __LINE__, ri));
221 
222 	pc = pmc_pcpu[cpu];
223 	pc->pc_hwpmcs[ri] = NULL;
224 
225 	return (0);
226 }
227 
228 static int
229 soft_pcpu_init(struct pmc_mdep *md, int cpu)
230 {
231 	int first_ri, n;
232 	struct pmc_cpu *pc;
233 	struct soft_cpu *soft_pc;
234 	struct pmc_hw *phw;
235 
236 
237 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
238 	    ("[soft,%d] illegal cpu %d", __LINE__, cpu));
239 	KASSERT(soft_pcpu, ("[soft,%d] null pcpu", __LINE__));
240 	KASSERT(soft_pcpu[cpu] == NULL, ("[soft,%d] non-null per-cpu",
241 	    __LINE__));
242 
243 	soft_pc = malloc(sizeof(struct soft_cpu), M_PMC, M_WAITOK|M_ZERO);
244 	if (soft_pc == NULL)
245 		return (ENOMEM);
246 
247 	pc = pmc_pcpu[cpu];
248 
249 	KASSERT(pc != NULL, ("[soft,%d] cpu %d null per-cpu", __LINE__, cpu));
250 
251 	soft_pcpu[cpu] = soft_pc;
252 	phw = soft_pc->soft_hw;
253 	first_ri = md->pmd_classdep[PMC_CLASS_INDEX_SOFT].pcd_ri;
254 
255 	for (n = 0; n < SOFT_NPMCS; n++, phw++) {
256 		phw->phw_state = PMC_PHW_FLAG_IS_ENABLED |
257 		    PMC_PHW_CPU_TO_STATE(cpu) | PMC_PHW_INDEX_TO_STATE(n);
258 		phw->phw_pmc = NULL;
259 		pc->pc_hwpmcs[n + first_ri] = phw;
260 	}
261 
262 	return (0);
263 }
264 
265 static int
266 soft_read_pmc(int cpu, int ri, pmc_value_t *v)
267 {
268 	struct pmc *pm;
269 	const struct pmc_hw *phw;
270 
271 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
272 	    ("[soft,%d] illegal CPU value %d", __LINE__, cpu));
273 	KASSERT(ri >= 0 && ri < SOFT_NPMCS,
274 	    ("[soft,%d] illegal row-index %d", __LINE__, ri));
275 
276 	phw = &soft_pcpu[cpu]->soft_hw[ri];
277 	pm  = phw->phw_pmc;
278 
279 	KASSERT(pm != NULL,
280 	    ("[soft,%d] no owner for PHW [cpu%d,pmc%d]", __LINE__, cpu, ri));
281 
282 	PMCDBG(MDP,REA,1,"soft-read id=%d", ri);
283 
284 	*v = soft_pcpu[cpu]->soft_values[ri];
285 
286 	return (0);
287 }
288 
289 static int
290 soft_write_pmc(int cpu, int ri, pmc_value_t v)
291 {
292 	struct pmc *pm;
293 	const struct soft_descr *pd;
294 
295 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
296 	    ("[soft,%d] illegal cpu value %d", __LINE__, cpu));
297 	KASSERT(ri >= 0 && ri < SOFT_NPMCS,
298 	    ("[soft,%d] illegal row-index %d", __LINE__, ri));
299 
300 	pm = soft_pcpu[cpu]->soft_hw[ri].phw_pmc;
301 	pd = &soft_pmcdesc[ri];
302 
303 	KASSERT(pm,
304 	    ("[soft,%d] cpu %d ri %d pmc not configured", __LINE__, cpu, ri));
305 
306 	PMCDBG(MDP,WRI,1, "soft-write cpu=%d ri=%d v=%jx", cpu, ri, v);
307 
308 	soft_pcpu[cpu]->soft_values[ri] = v;
309 
310 	return (0);
311 }
312 
313 static int
314 soft_release_pmc(int cpu, int ri, struct pmc *pmc)
315 {
316 	struct pmc_hw *phw;
317 	enum pmc_event ev;
318 	struct pmc_soft *ps;
319 
320 	(void) pmc;
321 
322 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
323 	    ("[soft,%d] illegal CPU value %d", __LINE__, cpu));
324 	KASSERT(ri >= 0 && ri < SOFT_NPMCS,
325 	    ("[soft,%d] illegal row-index %d", __LINE__, ri));
326 
327 	phw = &soft_pcpu[cpu]->soft_hw[ri];
328 
329 	KASSERT(phw->phw_pmc == NULL,
330 	    ("[soft,%d] PHW pmc %p non-NULL", __LINE__, phw->phw_pmc));
331 
332 	ev = pmc->pm_event;
333 
334 	/* Check if event is registered. */
335 	ps = pmc_soft_ev_acquire(ev);
336 	KASSERT(ps != NULL,
337 	    ("[soft,%d] unregistered event %d", __LINE__, ev));
338 	pmc_soft_ev_release(ps);
339 	/* Module unload is protected by pmc SX lock. */
340 	if (ps->ps_release != NULL)
341 		ps->ps_release();
342 	return (0);
343 }
344 
345 static int
346 soft_start_pmc(int cpu, int ri)
347 {
348 	struct pmc *pm;
349 	struct soft_cpu *pc;
350 	struct pmc_soft *ps;
351 
352 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
353 	    ("[soft,%d] illegal CPU value %d", __LINE__, cpu));
354 	KASSERT(ri >= 0 && ri < SOFT_NPMCS,
355 	    ("[soft,%d] illegal row-index %d", __LINE__, ri));
356 
357 	pc = soft_pcpu[cpu];
358 	pm = pc->soft_hw[ri].phw_pmc;
359 
360 	KASSERT(pm,
361 	    ("[soft,%d] cpu %d ri %d pmc not configured", __LINE__, cpu, ri));
362 
363 	ps = pmc_soft_ev_acquire(pm->pm_event);
364 	if (ps == NULL)
365 		return (EINVAL);
366 	atomic_add_int(&ps->ps_running, 1);
367 	pmc_soft_ev_release(ps);
368 
369 	return (0);
370 }
371 
372 static int
373 soft_stop_pmc(int cpu, int ri)
374 {
375 	struct pmc *pm;
376 	struct soft_cpu *pc;
377 	struct pmc_soft *ps;
378 
379 	KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
380 	    ("[soft,%d] illegal CPU value %d", __LINE__, cpu));
381 	KASSERT(ri >= 0 && ri < SOFT_NPMCS,
382 	    ("[soft,%d] illegal row-index %d", __LINE__, ri));
383 
384 	pc = soft_pcpu[cpu];
385 	pm = pc->soft_hw[ri].phw_pmc;
386 
387 	KASSERT(pm,
388 	    ("[soft,%d] cpu %d ri %d pmc not configured", __LINE__, cpu, ri));
389 
390 	ps = pmc_soft_ev_acquire(pm->pm_event);
391 	/* event unregistered ? */
392 	if (ps != NULL) {
393 		atomic_subtract_int(&ps->ps_running, 1);
394 		pmc_soft_ev_release(ps);
395 	}
396 
397 	return (0);
398 }
399 
400 int
401 pmc_soft_intr(struct pmckern_soft *ks)
402 {
403 	struct pmc *pm;
404 	struct soft_cpu *pc;
405 	int ri, processed, error, user_mode;
406 
407 	KASSERT(ks->pm_cpu >= 0 && ks->pm_cpu < pmc_cpu_max(),
408 	    ("[soft,%d] CPU %d out of range", __LINE__, ks->pm_cpu));
409 
410 	processed = 0;
411 	pc = soft_pcpu[ks->pm_cpu];
412 
413 	for (ri = 0; ri < SOFT_NPMCS; ri++) {
414 
415 		pm = pc->soft_hw[ri].phw_pmc;
416 		if (pm == NULL ||
417 		    pm->pm_state != PMC_STATE_RUNNING ||
418 		    pm->pm_event != ks->pm_ev) {
419 				continue;
420 		}
421 
422 		processed = 1;
423 		if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) {
424 			if ((pc->soft_values[ri]--) <= 0)
425 				pc->soft_values[ri] += pm->pm_sc.pm_reloadcount;
426 			else
427 				continue;
428 			user_mode = TRAPF_USERMODE(ks->pm_tf);
429 			error = pmc_process_interrupt(ks->pm_cpu, PMC_SR, pm,
430 			    ks->pm_tf, user_mode);
431 			if (error) {
432 				soft_stop_pmc(ks->pm_cpu, ri);
433 				continue;
434 			}
435 
436 			if (user_mode) {
437 				/* If in user mode setup AST to process
438 				 * callchain out of interrupt context.
439 				 */
440 				curthread->td_flags |= TDF_ASTPENDING;
441 			}
442 		} else
443 			pc->soft_values[ri]++;
444 	}
445 
446 	atomic_add_int(processed ? &pmc_stats.pm_intr_processed :
447 	    &pmc_stats.pm_intr_ignored, 1);
448 
449 	return (processed);
450 }
451 
452 void
453 pmc_soft_initialize(struct pmc_mdep *md)
454 {
455 	struct pmc_classdep *pcd;
456 
457 	/* Add SOFT PMCs. */
458 	soft_pcpu = malloc(sizeof(struct soft_cpu *) * pmc_cpu_max(), M_PMC,
459 	    M_ZERO|M_WAITOK);
460 
461 	pcd = &md->pmd_classdep[PMC_CLASS_INDEX_SOFT];
462 
463 	pcd->pcd_caps	= SOFT_CAPS;
464 	pcd->pcd_class	= PMC_CLASS_SOFT;
465 	pcd->pcd_num	= SOFT_NPMCS;
466 	pcd->pcd_ri	= md->pmd_npmc;
467 	pcd->pcd_width	= 64;
468 
469 	pcd->pcd_allocate_pmc = soft_allocate_pmc;
470 	pcd->pcd_config_pmc   = soft_config_pmc;
471 	pcd->pcd_describe     = soft_describe;
472 	pcd->pcd_get_config   = soft_get_config;
473 	pcd->pcd_get_msr      = NULL;
474 	pcd->pcd_pcpu_init    = soft_pcpu_init;
475 	pcd->pcd_pcpu_fini    = soft_pcpu_fini;
476 	pcd->pcd_read_pmc     = soft_read_pmc;
477 	pcd->pcd_write_pmc    = soft_write_pmc;
478 	pcd->pcd_release_pmc  = soft_release_pmc;
479 	pcd->pcd_start_pmc    = soft_start_pmc;
480 	pcd->pcd_stop_pmc     = soft_stop_pmc;
481 
482 	md->pmd_npmc += SOFT_NPMCS;
483 }
484 
485 void
486 pmc_soft_finalize(struct pmc_mdep *md)
487 {
488 #ifdef	INVARIANTS
489 	int i, ncpus;
490 
491 	ncpus = pmc_cpu_max();
492 	for (i = 0; i < ncpus; i++)
493 		KASSERT(soft_pcpu[i] == NULL, ("[soft,%d] non-null pcpu cpu %d",
494 		    __LINE__, i));
495 
496 	KASSERT(md->pmd_classdep[PMC_CLASS_INDEX_SOFT].pcd_class ==
497 	    PMC_CLASS_SOFT, ("[soft,%d] class mismatch", __LINE__));
498 #endif
499 	free(soft_pcpu, M_PMC);
500 	soft_pcpu = NULL;
501 }
502