kperf_kpc.c   [plain text]

/*
 * Copyright (c) 2013 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

/*  Sample KPC data into kperf and manage a shared context-switch handler */

#include <kperf/kperf.h>
#include <kperf/buffer.h>
#include <kperf/context.h>
#include <kperf/kperf_kpc.h>
#include <kern/kpc.h> /* kpc_cswitch_context, kpc_threads_counting */

unsigned kperf_kpc_cswitch_set = 0;

void
kperf_kpc_switch_context(thread_t old, thread_t new)
{
	if (kpc_threads_counting) {
		kpc_switch_context(old, new);
	}
	if (kperf_cswitch_callback_set) {
		kperf_switch_context(old, new);
	}
}

void
kperf_kpc_cswitch_callback_update(void)
{
	kperf_kpc_cswitch_set = kperf_cswitch_callback_set ||
	                        kpc_threads_counting;
}

void
kperf_kpc_thread_sample(struct kpcdata *kpcd, int sample_config)
{
	kpcd->running = kpc_get_running();
	/* let kpc_get_curthread_counters set the correct count */
	kpcd->counterc = KPC_MAX_COUNTERS;
	if (kpc_get_curthread_counters(&kpcd->counterc,
	                               kpcd->counterv)) {
		/* if thread counters aren't ready, default to 0 */
		memset(kpcd->counterv, 0,
		       sizeof(uint64_t) * kpcd->counterc);
	}
	/* help out Instruments */
	if (!sample_config) {
		kpcd->configc = 0;
	} else {
		kpcd->configc = kpc_get_config_count(kpcd->running);
		kpc_get_config(kpcd->running, kpcd->configv);
	}
}

void
kperf_kpc_cpu_sample(struct kpcdata *kpcd, int sample_config)
{
	kpcd->running  = kpc_get_running();
	kpcd->counterc = kpc_get_cpu_counters(0, kpcd->running,
	                                      &kpcd->curcpu,
	                                      kpcd->counterv);
	if (!sample_config) {
		kpcd->configc = 0;
	} else {
		kpcd->configc = kpc_get_config_count(kpcd->running);
		kpc_get_config(kpcd->running, kpcd->configv);
	}
}

static void
kperf_kpc_config_log(const struct kpcdata *kpcd)
{
	BUF_DATA(PERF_KPC_CONFIG,
	         kpcd->running,
	         kpcd->counterc,
	         kpc_get_counter_count(KPC_CLASS_FIXED_MASK),
	         kpcd->configc);
}

static void
kperf_kpc_log(uint32_t code, uint32_t code32, const struct kpcdata *kpcd)
{
	unsigned i;

#if __LP64__
	(void)code32;
	/* config registers */
	for (i = 0; i < ((kpcd->configc + 3) / 4); i++) {
		BUF_DATA(PERF_KPC_CFG_REG,
		         kpcd->configv[0 + i * 4],
		         kpcd->configv[1 + i * 4],
		         kpcd->configv[2 + i * 4],
		         kpcd->configv[3 + i * 4]);
	}

	/* and the actual counts with one 64-bit argument each */
	for (i = 0; i < ((kpcd->counterc + 3) / 4); i++) {
		BUF_DATA(code,
		         kpcd->counterv[0 + i * 4],
		         kpcd->counterv[1 + i * 4],
		         kpcd->counterv[2 + i * 4],
		         kpcd->counterv[3 + i * 4]);
	}
#else
	(void)code;
	/* config registers */
	for (i = 0; i < ((kpcd->configc + 1) / 2); i++) {
		BUF_DATA(PERF_KPC_CFG_REG32,
		         (kpcd->configv[0 + i * 2] >> 32ULL),
		         kpcd->configv[0 + i * 2] & 0xffffffffULL,
		         (kpcd->configv[1 + i * 2] >> 32ULL),
		         kpcd->configv[1 + i * 2] & 0xffffffffULL);
	}

	/* and the actual counts with two 32-bit trace arguments each */
	for (i = 0; i < ((kpcd->counterc + 1) / 2); i++) {
		BUF_DATA(code32,
		         (kpcd->counterv[0 + i * 2] >> 32ULL),
		         kpcd->counterv[0 + i * 2] & 0xffffffffULL,
		         (kpcd->counterv[1 + i * 2] >> 32ULL),
		         kpcd->counterv[1 + i * 2] & 0xffffffffULL);
	}
#endif
}

void
kperf_kpc_cpu_log(const struct kpcdata *kpcd)
{
	kperf_kpc_config_log(kpcd);
	kperf_kpc_log(PERF_KPC_DATA, PERF_KPC_DATA32, kpcd);
}

void
kperf_kpc_thread_log(const struct kpcdata *kpcd)
{
	kperf_kpc_config_log(kpcd);
	kperf_kpc_log(PERF_KPC_DATA_THREAD, PERF_KPC_DATA_THREAD32, kpcd);
}