--- /dev/null
+/*
+ * Copyright (c) 2017 Apple 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@
+ */
+
+#include <kern/monotonic.h>
+#include <machine/machine_routines.h>
+#include <machine/monotonic.h>
+#include <pexpert/pexpert.h>
+#include <sys/param.h> /* NULL */
+#include <sys/stat.h> /* dev_t */
+#include <miscfs/devfs/devfs.h> /* must come after sys/stat.h */
+#include <sys/conf.h> /* must come after sys/stat.h */
+#include <sys/sysctl.h>
+#include <sys/sysproto.h>
+#include <sys/systm.h>
+#include <sys/types.h>
+#include <sys/monotonic.h>
+
+static int mt_dev_open(dev_t dev, int flags, int devtype, struct proc *p);
+static int mt_dev_close(dev_t dev, int flags, int devtype, struct proc *p);
+static int mt_dev_ioctl(dev_t dev, unsigned long cmd, char *uptr, int fflag,
+ struct proc *p);
+
+static struct cdevsw mt_cdevsw = {
+ .d_open = mt_dev_open,
+ .d_close = mt_dev_close,
+ .d_read = eno_rdwrt,
+ .d_write = eno_rdwrt,
+ .d_ioctl = mt_dev_ioctl,
+ .d_stop = eno_stop,
+ .d_reset = eno_reset,
+ .d_ttys = NULL,
+ .d_select = eno_select,
+ .d_mmap = eno_mmap,
+ .d_strategy = eno_strat,
+ .d_type = 0
+};
+
+/*
+ * Written at initialization, read-only thereafter.
+ */
+lck_grp_t *mt_lock_grp = NULL;
+
+static int mt_dev_major;
+decl_lck_mtx_data(static, mt_dev_mtxs[MT_NDEVS]);
+static bool mt_dev_owned[MT_NDEVS];
+
+static void
+mt_dev_lock(dev_t dev)
+{
+ lck_mtx_lock(&mt_dev_mtxs[minor(dev)]);
+}
+
+static void
+mt_dev_unlock(dev_t dev)
+{
+ lck_mtx_unlock(&mt_dev_mtxs[minor(dev)]);
+}
+
+static void
+mt_dev_assert_lock_held(__assert_only dev_t dev)
+{
+ LCK_MTX_ASSERT(&mt_dev_mtxs[minor(dev)], LCK_MTX_ASSERT_OWNED);
+}
+
+int
+mt_dev_init(void)
+{
+ lck_grp_attr_t *lock_grp_attr = NULL;
+ int devices = 0;
+
+ lock_grp_attr = lck_grp_attr_alloc_init();
+ mt_lock_grp = lck_grp_alloc_init("monotonic", lock_grp_attr);
+ lck_grp_attr_free(lock_grp_attr);
+
+ mt_dev_major = cdevsw_add(-1 /* allocate a major number */, &mt_cdevsw);
+ if (mt_dev_major < 0) {
+ panic("monotonic: cdevsw_add failed: %d", mt_dev_major);
+ __builtin_trap();
+ }
+
+ for (int i = 0; i < MT_NDEVS; i++) {
+ dev_t dev;
+ void *dn;
+ int error;
+
+ error = monotonic_devs[i].mtd_init();
+ if (error) {
+ continue;
+ }
+
+ dev = makedev(mt_dev_major, i);
+ dn = devfs_make_node(dev,
+ DEVFS_CHAR, UID_ROOT, GID_WINDOWSERVER, 0666,
+ monotonic_devs[i].mtd_name);
+ if (dn == NULL) {
+ panic("monotonic: devfs_make_node failed for '%s'",
+ monotonic_devs[i].mtd_name);
+ __builtin_trap();
+ }
+
+ lck_mtx_init(&mt_dev_mtxs[i], mt_lock_grp, LCK_ATTR_NULL);
+
+ devices++;
+ }
+
+ return 0;
+}
+
+static int
+mt_dev_open(dev_t dev, __unused int flags, __unused int devtype,
+ __unused struct proc *p)
+{
+ int error = 0;
+
+ mt_dev_lock(dev);
+
+ if (mt_dev_owned[minor(dev)]) {
+ error = EBUSY;
+ goto out;
+ }
+
+ mt_dev_owned[minor(dev)] = true;
+
+out:
+ mt_dev_unlock(dev);
+ return error;
+}
+
+static int
+mt_dev_close(dev_t dev, __unused int flags, __unused int devtype,
+ __unused struct proc *p)
+{
+ mt_dev_lock(dev);
+
+ assert(mt_dev_owned[minor(dev)]);
+ mt_dev_owned[minor(dev)] = false;
+
+ monotonic_devs[minor(dev)].mtd_reset();
+
+ mt_dev_unlock(dev);
+
+ return 0;
+}
+
+static int
+mt_ctl_add(dev_t dev, user_addr_t uptr, __unused int flags,
+ __unused struct proc *p)
+{
+ int error;
+ uint32_t ctr;
+ union monotonic_ctl_add ctl;
+
+ mt_dev_assert_lock_held(dev);
+
+ error = copyin(uptr, &ctl, sizeof(ctl.in));
+ if (error) {
+ return error;
+ }
+
+ error = monotonic_devs[minor(dev)].mtd_add(&ctl.in.config, &ctr);
+ if (error) {
+ return error;
+ }
+
+ ctl.out.ctr = ctr;
+
+ error = copyout(&ctl, uptr, sizeof(ctl.out));
+ if (error) {
+ return error;
+ }
+
+ return 0;
+}
+
+static int
+mt_ctl_counts(dev_t dev, user_addr_t uptr, __unused int flags,
+ __unused struct proc *p)
+{
+ int error;
+ uint64_t ctrs;
+ union monotonic_ctl_counts ctl;
+
+ mt_dev_assert_lock_held(dev);
+
+ error = copyin(uptr, &ctl, sizeof(ctl.in));
+ if (error) {
+ return error;
+ }
+
+ if (ctl.in.ctr_mask == 0) {
+ return EINVAL;
+ }
+ ctrs = __builtin_popcountll(ctl.in.ctr_mask);
+
+ {
+ uint64_t counts[ctrs];
+ error = monotonic_devs[minor(dev)].mtd_read(ctl.in.ctr_mask, counts);
+ if (error) {
+ return error;
+ }
+
+ error = copyout(&counts, uptr, sizeof(counts));
+ if (error) {
+ return error;
+ }
+ }
+
+ return 0;
+}
+
+static int
+mt_ctl_enable(dev_t dev, user_addr_t uptr)
+{
+ int error;
+ union monotonic_ctl_enable ctl;
+
+ mt_dev_assert_lock_held(dev);
+
+ error = copyin(uptr, &ctl, sizeof(ctl));
+ if (error) {
+ return error;
+ }
+
+ monotonic_devs[minor(dev)].mtd_enable(ctl.in.enable);
+
+ return 0;
+}
+
+static int
+mt_ctl_reset(dev_t dev)
+{
+ mt_dev_assert_lock_held(dev);
+ monotonic_devs[minor(dev)].mtd_reset();
+ return 0;
+}
+
+static int
+mt_dev_ioctl(dev_t dev, unsigned long cmd, char *arg, int flags,
+ struct proc *p)
+{
+ int error;
+ user_addr_t uptr = *(user_addr_t *)(void *)arg;
+
+ mt_dev_lock(dev);
+
+ switch (cmd) {
+ case MT_IOC_RESET:
+ error = mt_ctl_reset(dev);
+ break;
+
+ case MT_IOC_ADD:
+ error = mt_ctl_add(dev, uptr, flags, p);
+ break;
+
+ case MT_IOC_ENABLE:
+ error = mt_ctl_enable(dev, uptr);
+ break;
+
+ case MT_IOC_COUNTS:
+ error = mt_ctl_counts(dev, uptr, flags, p);
+ break;
+
+ default:
+ error = ENODEV;
+ break;
+ }
+
+ mt_dev_unlock(dev);
+
+ return error;
+}
+
+int thread_selfcounts(__unused struct proc *p,
+ struct thread_selfcounts_args *uap, __unused int *ret_out)
+{
+ switch (uap->type) {
+ case 1: {
+ uint64_t counts[2] = {};
+ uint64_t thread_counts[MT_CORE_NFIXED];
+
+ mt_cur_thread_fixed_counts(thread_counts);
+
+#ifdef MT_CORE_INSTRS
+ counts[0] = thread_counts[MT_CORE_INSTRS];
+#endif /* defined(MT_CORE_INSTRS) */
+ counts[1] = thread_counts[MT_CORE_CYCLES];
+
+ return copyout(counts, uap->buf, MIN(sizeof(counts), uap->nbytes));
+ }
+ default:
+ return EINVAL;
+ }
+}
+
+enum mt_sysctl {
+ MT_SUPPORTED,
+ MT_PMIS,
+ MT_RETROGRADE,
+ MT_TASK_THREAD,
+ MT_DEBUG,
+ MT_KDBG_TEST,
+ MT_FIX_CPU_PERF,
+ MT_FIX_THREAD_PERF,
+ MT_FIX_TASK_PERF,
+};
+
+static int
+mt_sysctl SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp, arg2)
+ uint64_t start[MT_CORE_NFIXED], end[MT_CORE_NFIXED];
+ uint64_t counts[2] = {};
+
+ switch ((enum mt_sysctl)arg1) {
+ case MT_SUPPORTED:
+ return sysctl_io_number(req, mt_core_supported, sizeof(mt_core_supported), NULL, NULL);
+ case MT_PMIS:
+ return sysctl_io_number(req, mt_pmis, sizeof(mt_pmis), NULL, NULL);
+ case MT_RETROGRADE:
+ return sysctl_io_number(req, mt_retrograde, sizeof(mt_retrograde), NULL, NULL);
+ case MT_TASK_THREAD:
+ return sysctl_io_number(req, mt_core_supported, sizeof(mt_core_supported), NULL, NULL);
+ case MT_DEBUG: {
+ int value = mt_debug;
+
+ int r = sysctl_io_number(req, value, sizeof(value), &value, NULL);
+ if (r) {
+ return r;
+ }
+ mt_debug = value;
+
+ return 0;
+ }
+ case MT_KDBG_TEST: {
+ if (req->newptr == USER_ADDR_NULL) {
+ return EINVAL;
+ }
+
+ int intrs_en = ml_set_interrupts_enabled(FALSE);
+ MT_KDBG_TMPCPU_START(0x3fff);
+ MT_KDBG_TMPCPU_END(0x3fff);
+
+ MT_KDBG_TMPTH_START(0x3fff);
+ MT_KDBG_TMPTH_END(0x3fff);
+ ml_set_interrupts_enabled(intrs_en);
+
+ return 0;
+ }
+ case MT_FIX_CPU_PERF: {
+ int intrs_en = ml_set_interrupts_enabled(FALSE);
+ mt_fixed_counts(start);
+ mt_fixed_counts(end);
+ ml_set_interrupts_enabled(intrs_en);
+
+ goto copyout_counts;
+ }
+ case MT_FIX_THREAD_PERF: {
+ int intrs_en = ml_set_interrupts_enabled(FALSE);
+ mt_cur_thread_fixed_counts(start);
+ mt_cur_thread_fixed_counts(end);
+ ml_set_interrupts_enabled(intrs_en);
+
+ goto copyout_counts;
+ }
+ case MT_FIX_TASK_PERF: {
+ int intrs_en = ml_set_interrupts_enabled(FALSE);
+ mt_cur_task_fixed_counts(start);
+ mt_cur_task_fixed_counts(end);
+ ml_set_interrupts_enabled(intrs_en);
+
+ goto copyout_counts;
+ }
+ default:
+ return ENOENT;
+ }
+
+copyout_counts:
+
+#ifdef MT_CORE_INSTRS
+ counts[0] = end[MT_CORE_INSTRS] - start[MT_CORE_INSTRS];
+#endif /* defined(MT_CORE_INSTRS) */
+ counts[1] = end[MT_CORE_CYCLES] - start[MT_CORE_CYCLES];
+
+ return copyout(counts, req->oldptr, MIN(req->oldlen, sizeof(counts)));
+}
+
+SYSCTL_DECL(_kern_monotonic);
+SYSCTL_NODE(_kern, OID_AUTO, monotonic, CTLFLAG_RW | CTLFLAG_LOCKED, 0,
+ "monotonic");
+
+SYSCTL_PROC(_kern_monotonic, OID_AUTO, supported,
+ CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MASKED | CTLFLAG_LOCKED,
+ (void *)MT_SUPPORTED, sizeof(int), mt_sysctl, "I",
+ "whether monotonic is supported");
+
+SYSCTL_PROC(_kern_monotonic, OID_AUTO, debug,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MASKED,
+ (void *)MT_DEBUG, sizeof(int), mt_sysctl, "I",
+ "whether monotonic is printing debug messages");
+
+SYSCTL_PROC(_kern_monotonic, OID_AUTO, pmis,
+ CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MASKED | CTLFLAG_LOCKED,
+ (void *)MT_PMIS, sizeof(uint64_t), mt_sysctl, "Q",
+ "how many PMIs have been seen");
+
+SYSCTL_PROC(_kern_monotonic, OID_AUTO, retrograde_updates,
+ CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MASKED | CTLFLAG_LOCKED,
+ (void *)MT_RETROGRADE, sizeof(uint64_t), mt_sysctl, "Q",
+ "how many times a counter appeared to go backwards");
+
+SYSCTL_PROC(_kern_monotonic, OID_AUTO, task_thread_counting,
+ CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MASKED,
+ (void *)MT_TASK_THREAD, sizeof(int), mt_sysctl, "I",
+ "task and thread counting enabled");
+
+SYSCTL_PROC(_kern_monotonic, OID_AUTO, kdebug_test,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MASKED | CTLFLAG_LOCKED,
+ (void *)MT_KDBG_TEST, sizeof(int), mt_sysctl, "O",
+ "test that kdebug integration works");
+
+SYSCTL_PROC(_kern_monotonic, OID_AUTO, fixed_cpu_perf,
+ CTLFLAG_RW | CTLFLAG_MASKED | CTLFLAG_LOCKED,
+ (void *)MT_FIX_CPU_PERF, sizeof(uint64_t) * 2, mt_sysctl, "O",
+ "overhead of accessing the current CPU's counters");
+
+SYSCTL_PROC(_kern_monotonic, OID_AUTO, fixed_thread_perf,
+ CTLFLAG_RW | CTLFLAG_MASKED | CTLFLAG_LOCKED,
+ (void *)MT_FIX_THREAD_PERF, sizeof(uint64_t) * 2, mt_sysctl, "O",
+ "overhead of accessing the current thread's counters");
+
+SYSCTL_PROC(_kern_monotonic, OID_AUTO, fixed_task_perf,
+ CTLFLAG_RW | CTLFLAG_MASKED | CTLFLAG_LOCKED,
+ (void *)MT_FIX_TASK_PERF, sizeof(uint64_t) * 2, mt_sysctl, "O",
+ "overhead of accessing the current task's counters");
projects / apple / xnu.git / blobdiff