/*
* Copyright (c) 2021 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@
*/
#define __APPLE_API_PRIVATE 1
#define __APPLE_API_UNSTABLE 1
#include <kern/debug.h>
#include <kern/iotrace.h>
#include <kern/zalloc.h>
#include <pexpert/pexpert.h>
#define DEFAULT_IOTRACE_ENTRIES_PER_CPU (64)
#define IOTRACE_MAX_ENTRIES_PER_CPU (1024)
volatile int mmiotrace_enabled = 1;
uint32_t iotrace_entries_per_cpu;
uint32_t PERCPU_DATA(iotrace_next);
iotrace_entry_t *PERCPU_DATA(iotrace_ring);
static void
init_iotrace_bufs(int entries_per_cpu)
{
const size_t size = entries_per_cpu * sizeof(iotrace_entry_t);
percpu_foreach(ring, iotrace_ring) {
*ring = zalloc_permanent_tag(size, ZALIGN(iotrace_entry_t),
VM_KERN_MEMORY_DIAG);
};
iotrace_entries_per_cpu = entries_per_cpu;
}
__startup_func
static void
iotrace_init(void)
{
int entries_per_cpu = DEFAULT_IOTRACE_ENTRIES_PER_CPU;
int enable = mmiotrace_enabled;
if (kern_feature_override(KF_IOTRACE_OVRD)) {
enable = 0;
}
(void) PE_parse_boot_argn("iotrace", &enable, sizeof(enable));
if (enable != 0 &&
PE_parse_boot_argn("iotrace_epc", &entries_per_cpu, sizeof(entries_per_cpu)) &&
(entries_per_cpu < 1 || entries_per_cpu > IOTRACE_MAX_ENTRIES_PER_CPU)) {
entries_per_cpu = DEFAULT_IOTRACE_ENTRIES_PER_CPU;
}
mmiotrace_enabled = enable;
if (mmiotrace_enabled) {
init_iotrace_bufs(entries_per_cpu);
}
}
STARTUP(EARLY_BOOT, STARTUP_RANK_MIDDLE, iotrace_init);