/*
- * Copyright (c) 2000-2010 Apple, Inc. All rights reserved.
+ * Copyright (c) 2000-2016 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
* 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,
* 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@
*/
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
#include <sys/systm.h>
#include <sys/proc_internal.h>
#include <sys/vnode.h>
+#include <stdbool.h>
+#include <firehose/tracepoint_private.h>
+#include <firehose/ioctl_private.h>
+#include <os/firehose_buffer_private.h>
+
+#include <os/log_private.h>
#include <sys/ioctl.h>
#include <sys/msgbuf.h>
#include <sys/file_internal.h>
#include <sys/select.h>
#include <sys/kernel.h>
#include <kern/thread.h>
+#include <kern/sched_prim.h>
+#include <kern/simple_lock.h>
#include <sys/lock.h>
#include <sys/signalvar.h>
#include <sys/conf.h>
#include <sys/sysctl.h>
+#include <sys/queue.h>
#include <kern/kalloc.h>
#include <pexpert/pexpert.h>
+#include <mach/mach_port.h>
+#include <mach/mach_vm.h>
+#include <mach/vm_map.h>
+#include <vm/vm_kern.h>
+#include <kern/task.h>
+#include <kern/locks.h>
/* XXX should be in a common header somewhere */
extern void logwakeup(void);
+extern void oslogwakeup(void);
+extern void oslog_streamwakeup(void);
+static void oslog_streamwakeup_locked(void);
+vm_offset_t kernel_firehose_addr = 0;
+
+/* log message counters for streaming mode */
+uint32_t oslog_s_streamed_msgcount = 0;
+uint32_t oslog_s_dropped_msgcount = 0;
+extern uint32_t oslog_s_error_count;
#define LOG_RDPRI (PZERO + 1)
int log_open; /* also used in log() */
char smsg_bufc[CONFIG_MSG_BSIZE]; /* static buffer */
+char oslog_stream_bufc[FIREHOSE_BUFFER_CHUNK_SIZE]; /* static buffer */
+struct firehose_buffer_chunk_s __attribute__((aligned(8))) oslog_boot_buf = {
+ .fbc_pos = {
+ .fbc_next_entry_offs = offsetof(struct firehose_buffer_chunk_s, fbc_data),
+ .fbc_private_offs = FIREHOSE_BUFFER_CHUNK_SIZE,
+ .fbc_refcnt = 1, // indicate that there is a writer to this chunk
+ .fbc_stream = firehose_stream_persist,
+ .fbc_flag_io = 1, // for now, lets assume this is coming from the io bank
+ },
+}; /* static buffer */
+firehose_buffer_chunk_t firehose_boot_chunk = &oslog_boot_buf;
struct msgbuf msgbuf = {MSG_MAGIC,sizeof(smsg_bufc),0,0,smsg_bufc};
+struct msgbuf oslog_stream_buf = {MSG_MAGIC,0,0,0,NULL};
struct msgbuf *msgbufp __attribute__((used)) = &msgbuf;
+struct msgbuf *oslog_streambufp __attribute__((used)) = &oslog_stream_buf;
+
+// List entries for keeping track of the streaming buffer
+static oslog_stream_buf_entry_t oslog_stream_buf_entries;
+
+#define OSLOG_NUM_STREAM_ENTRIES 64
+#define OSLOG_STREAM_BUF_SIZE 4096
+
+int oslog_open = 0;
+int os_log_wakeup = 0;
+int oslog_stream_open = 0;
+int oslog_stream_buf_size = OSLOG_STREAM_BUF_SIZE;
+int oslog_stream_num_entries = OSLOG_NUM_STREAM_ENTRIES;
+
+/* oslogsoftc only valid while oslog_open=1 */
+struct oslogsoftc {
+ int sc_state; /* see above for possibilities */
+ struct selinfo sc_selp; /* thread waiting for select */
+ int sc_pgid; /* process/group for async I/O */
+} oslogsoftc;
+
+struct oslog_streamsoftc {
+ int sc_state; /* see above for possibilities */
+ struct selinfo sc_selp; /* thread waiting for select */
+ int sc_pgid; /* process/group for async I/O */
+}oslog_streamsoftc;
+
+STAILQ_HEAD(, oslog_stream_buf_entry_s) oslog_stream_free_head =
+ STAILQ_HEAD_INITIALIZER(oslog_stream_free_head);
+STAILQ_HEAD(, oslog_stream_buf_entry_s) oslog_stream_buf_head =
+ STAILQ_HEAD_INITIALIZER(oslog_stream_buf_head);
-/* the following are implemented in osfmk/kern/printf.c */
+/* defined in osfmk/kern/printf.c */
+extern void oslog_lock_init(void);
extern void bsd_log_lock(void);
extern void bsd_log_unlock(void);
-extern void bsd_log_init(void);
+
+/* defined for osfmk/kern/printf.c */
+void bsd_log_init(void);
+
+/*
+ * Ideally this file would define this lock, but bsd doesn't have the definition
+ * for lock groups.
+ */
+decl_lck_spin_data(extern, oslog_stream_lock)
/* XXX wants a linker set so these can be static */
extern d_open_t logopen;
extern d_ioctl_t logioctl;
extern d_select_t logselect;
+/* XXX wants a linker set so these can be static */
+extern d_open_t oslogopen;
+extern d_close_t oslogclose;
+extern d_select_t oslogselect;
+extern d_ioctl_t oslogioctl;
+
+/* XXX wants a linker set so these can be static */
+extern d_open_t oslog_streamopen;
+extern d_close_t oslog_streamclose;
+extern d_read_t oslog_streamread;
+extern d_ioctl_t oslog_streamioctl;
+extern d_select_t oslog_streamselect;
+
+void oslog_init(void);
+void oslog_setsize(int size);
+void oslog_streamwrite_locked(firehose_tracepoint_id_u ftid,
+ uint64_t stamp, const void *pubdata, size_t publen);
+void oslog_streamwrite_metadata_locked(oslog_stream_buf_entry_t m_entry);
+static oslog_stream_buf_entry_t oslog_stream_find_free_buf_entry_locked(void);
+static void oslog_streamwrite_append_bytes(const char *buffer, int buflen);
+
/*
* Serialize log access. Note that the log can be written at interrupt level,
* so any log manipulations that can be done from, or affect, another processor
logclose(__unused dev_t dev, __unused int flag, __unused int devtype, __unused struct proc *p)
{
LOG_LOCK();
+ logsoftc.sc_state &= ~(LOG_NBIO | LOG_ASYNC);
selwakeup(&logsoftc.sc_selp);
selthreadclear(&logsoftc.sc_selp);
log_open = 0;
return (0);
}
+
+int
+oslogopen(__unused dev_t dev, __unused int flags, __unused int mode, struct proc *p)
+{
+ LOG_LOCK();
+ if (oslog_open) {
+ LOG_UNLOCK();
+ return(EBUSY);
+ }
+ oslogsoftc.sc_pgid = p->p_pid; /* signal process only */
+ oslog_open = 1;
+
+ LOG_UNLOCK();
+ return (0);
+}
+
+int
+oslogclose(__unused dev_t dev, __unused int flag, __unused int devtype, __unused struct proc *p)
+{
+ LOG_LOCK();
+ oslogsoftc.sc_state &= ~(LOG_NBIO | LOG_ASYNC);
+ selwakeup(&oslogsoftc.sc_selp);
+ selthreadclear(&oslogsoftc.sc_selp);
+ oslog_open = 0;
+ LOG_UNLOCK();
+ return (0);
+}
+
+int
+oslog_streamopen(__unused dev_t dev, __unused int flags, __unused int mode, struct proc *p)
+{
+ char *oslog_stream_msg_bufc = NULL;
+ oslog_stream_buf_entry_t entries = NULL;
+
+ lck_spin_lock(&oslog_stream_lock);
+ if (oslog_stream_open) {
+ lck_spin_unlock(&oslog_stream_lock);
+ return EBUSY;
+ }
+ lck_spin_unlock(&oslog_stream_lock);
+
+ // Allocate the stream buffer
+ oslog_stream_msg_bufc = kalloc(oslog_stream_buf_size);
+ if (!oslog_stream_msg_bufc) {
+ return ENOMEM;
+ }
+
+ /* entries to support kernel logging in stream mode */
+ entries = kalloc(oslog_stream_num_entries * sizeof(struct oslog_stream_buf_entry_s));
+ if (!entries) {
+ kfree(oslog_stream_msg_bufc, oslog_stream_buf_size);
+ return ENOMEM;
+ }
+
+ lck_spin_lock(&oslog_stream_lock);
+ if (oslog_stream_open) {
+ lck_spin_unlock(&oslog_stream_lock);
+ kfree(oslog_stream_msg_bufc, oslog_stream_buf_size);
+ kfree(entries, oslog_stream_num_entries * sizeof(struct oslog_stream_buf_entry_s));
+ return EBUSY;
+ }
+
+ assert(oslog_streambufp->msg_bufc == NULL);
+ oslog_streambufp->msg_bufc = oslog_stream_msg_bufc;
+ oslog_streambufp->msg_size = oslog_stream_buf_size;
+
+ oslog_stream_buf_entries = entries;
+
+ STAILQ_INIT(&oslog_stream_free_head);
+ STAILQ_INIT(&oslog_stream_buf_head);
+
+ for (int i = 0; i < oslog_stream_num_entries; i++) {
+ oslog_stream_buf_entries[i].type = oslog_stream_link_type_log;
+ oslog_stream_buf_entries[i].offset = 0;
+ oslog_stream_buf_entries[i].size = 0;
+ oslog_stream_buf_entries[i].timestamp = 0;
+ STAILQ_INSERT_TAIL(&oslog_stream_free_head, &oslog_stream_buf_entries[i], buf_entries);
+ }
+
+ /* there should be no pending entries in the stream */
+ assert(STAILQ_EMPTY(&oslog_stream_buf_head));
+ assert(oslog_streambufp->msg_bufx == 0);
+ assert(oslog_streambufp->msg_bufr == 0);
+
+ oslog_streambufp->msg_bufx = 0;
+ oslog_streambufp->msg_bufr = 0;
+ oslog_streamsoftc.sc_pgid = p->p_pid; /* signal process only */
+ oslog_stream_open = 1;
+ lck_spin_unlock(&oslog_stream_lock);
+
+ return 0;
+}
+
+int
+oslog_streamclose(__unused dev_t dev, __unused int flag, __unused int devtype, __unused struct proc *p)
+{
+ oslog_stream_buf_entry_t next_entry = NULL;
+ char *oslog_stream_msg_bufc = NULL;
+ oslog_stream_buf_entry_t entries = NULL;
+
+ lck_spin_lock(&oslog_stream_lock);
+
+ if (oslog_stream_open == 0) {
+ lck_spin_unlock(&oslog_stream_lock);
+ return EBADF;
+ }
+
+ // Consume all log lines
+ while (!STAILQ_EMPTY(&oslog_stream_buf_head)) {
+ next_entry = STAILQ_FIRST(&oslog_stream_buf_head);
+ STAILQ_REMOVE_HEAD(&oslog_stream_buf_head, buf_entries);
+ }
+ oslog_streamwakeup_locked();
+ oslog_streamsoftc.sc_state &= ~(LOG_NBIO | LOG_ASYNC);
+ selwakeup(&oslog_streamsoftc.sc_selp);
+ selthreadclear(&oslog_streamsoftc.sc_selp);
+ oslog_stream_open = 0;
+ oslog_streambufp->msg_bufr = 0;
+ oslog_streambufp->msg_bufx = 0;
+ oslog_stream_msg_bufc = oslog_streambufp->msg_bufc;
+ oslog_streambufp->msg_bufc = NULL;
+ entries = oslog_stream_buf_entries;
+ oslog_stream_buf_entries = NULL;
+ oslog_streambufp->msg_size = 0;
+
+ lck_spin_unlock(&oslog_stream_lock);
+
+ // Free the stream buffer
+ kfree(oslog_stream_msg_bufc, oslog_stream_buf_size);
+ // Free the list entries
+ kfree(entries, oslog_stream_num_entries * sizeof(struct oslog_stream_buf_entry_s));
+
+ return 0;
+}
+
/*ARGSUSED*/
int
logread(__unused dev_t dev, struct uio *uio, int flag)
return (error);
}
+/*ARGSUSED*/
+int
+oslog_streamread(__unused dev_t dev, struct uio *uio, int flag)
+{
+ int error = 0;
+ int copy_size = 0;
+ static char logline[FIREHOSE_BUFFER_CHUNK_SIZE];
+
+ lck_spin_lock(&oslog_stream_lock);
+
+ if (!oslog_stream_open) {
+ lck_spin_unlock(&oslog_stream_lock);
+ return EBADF;
+ }
+
+ while (STAILQ_EMPTY(&oslog_stream_buf_head)) {
+ if (flag & IO_NDELAY || oslog_streamsoftc.sc_state & LOG_NBIO) {
+ lck_spin_unlock(&oslog_stream_lock);
+ return EWOULDBLOCK;
+ }
+
+ oslog_streamsoftc.sc_state |= LOG_RDWAIT;
+ wait_result_t wr = assert_wait((event_t)oslog_streambufp,
+ THREAD_INTERRUPTIBLE);
+ if (wr == THREAD_WAITING) {
+ lck_spin_unlock(&oslog_stream_lock);
+ wr = thread_block(THREAD_CONTINUE_NULL);
+ lck_spin_lock(&oslog_stream_lock);
+ }
+
+ switch (wr) {
+ case THREAD_AWAKENED:
+ case THREAD_TIMED_OUT:
+ break;
+ default:
+ lck_spin_unlock(&oslog_stream_lock);
+ return EINTR;
+ }
+ }
+
+ if (!oslog_stream_open) {
+ lck_spin_unlock(&oslog_stream_lock);
+ return EBADF;
+ }
+
+ int logpos = 0;
+ oslog_stream_buf_entry_t read_entry = NULL;
+ uint16_t rec_length;
+
+ read_entry = STAILQ_FIRST(&oslog_stream_buf_head);
+ assert(read_entry != NULL);
+ STAILQ_REMOVE_HEAD(&oslog_stream_buf_head, buf_entries);
+
+ // Copy the timestamp first
+ memcpy(logline + logpos, &read_entry->timestamp, sizeof(uint64_t));
+ logpos += sizeof(uint64_t);
+
+ switch (read_entry->type) {
+ /* Handle metadata messages */
+ case oslog_stream_link_type_metadata:
+ {
+ memcpy(logline + logpos,
+ (read_entry->metadata), read_entry->size);
+ logpos += read_entry->size;
+
+ lck_spin_unlock(&oslog_stream_lock);
+
+ // Free the list entry
+ kfree(read_entry, (sizeof(struct oslog_stream_buf_entry_s) + read_entry->size));
+ break;
+ }
+ /* Handle log messages */
+ case oslog_stream_link_type_log:
+ {
+ /* ensure that the correct read entry was dequeued */
+ assert(read_entry->offset == oslog_streambufp->msg_bufr);
+ rec_length = read_entry->size;
+
+ // If the next log line is contiguous in the buffer, copy it out.
+ if(read_entry->offset + rec_length <= oslog_streambufp->msg_size) {
+ memcpy(logline + logpos,
+ oslog_streambufp->msg_bufc + read_entry->offset, rec_length);
+
+ oslog_streambufp->msg_bufr += rec_length;
+ if (oslog_streambufp->msg_bufr == oslog_streambufp->msg_size) {
+ oslog_streambufp->msg_bufr = 0;
+ }
+ logpos += rec_length;
+ } else {
+ // Otherwise, copy until the end of the buffer, and
+ // copy the remaining bytes starting at index 0.
+ int bytes_left = oslog_streambufp->msg_size - read_entry->offset;
+ memcpy(logline + logpos,
+ oslog_streambufp->msg_bufc + read_entry->offset, bytes_left);
+ logpos += bytes_left;
+ rec_length -= bytes_left;
+
+ memcpy(logline + logpos, (const void *)oslog_streambufp->msg_bufc,
+ rec_length);
+ oslog_streambufp->msg_bufr = rec_length;
+ logpos += rec_length;
+ }
+ assert(oslog_streambufp->msg_bufr < oslog_streambufp->msg_size);
+ STAILQ_INSERT_TAIL(&oslog_stream_free_head, read_entry, buf_entries);
+
+ lck_spin_unlock(&oslog_stream_lock);
+ break;
+ }
+ default:
+ {
+ panic("Got unexpected log entry type: %hhu\n", read_entry->type);
+ }
+ }
+
+ copy_size = min(logpos, uio_resid(uio));
+ if (copy_size != 0) {
+ error = uiomove((caddr_t)logline, copy_size, uio);
+ }
+ (void)hw_atomic_add(&oslog_s_streamed_msgcount, 1);
+
+ return error;
+}
+
/*ARGSUSED*/
int
logselect(__unused dev_t dev, int rw, void * wql, struct proc *p)
return (0);
}
+int
+oslogselect(__unused dev_t dev, int rw, void * wql, struct proc *p)
+{
+ switch (rw) {
+
+ case FREAD:
+ LOG_LOCK();
+ if (os_log_wakeup) {
+ LOG_UNLOCK();
+ return (1);
+ }
+ selrecord(p, &oslogsoftc.sc_selp, wql);
+ LOG_UNLOCK();
+ break;
+ }
+ return (0);
+}
+
+int
+oslog_streamselect(__unused dev_t dev, int rw, void * wql, struct proc *p)
+{
+ int ret = 0;
+
+ lck_spin_lock(&oslog_stream_lock);
+
+ switch (rw) {
+ case FREAD:
+ if (STAILQ_EMPTY(&oslog_stream_buf_head)) {
+ selrecord(p, &oslog_streamsoftc.sc_selp, wql);
+ } else {
+ ret = 1;
+ }
+ break;
+ }
+
+ lck_spin_unlock(&oslog_stream_lock);
+ return ret;
+}
+
void
logwakeup(void)
{
int pgid;
+ /* cf. r24974766 & r25201228*/
+ if (oslog_is_safe() == FALSE) {
+ return;
+ }
+
LOG_LOCK();
if (!log_open) {
LOG_UNLOCK();
LOG_UNLOCK();
}
+void
+oslogwakeup(void)
+{
+ LOG_LOCK();
+ if (!oslog_open) {
+ LOG_UNLOCK();
+ return;
+ }
+ selwakeup(&oslogsoftc.sc_selp);
+ os_log_wakeup = 1;
+ LOG_UNLOCK();
+}
+
+static void
+oslog_streamwakeup_locked(void)
+{
+ lck_spin_assert(&oslog_stream_lock, LCK_ASSERT_OWNED);
+ if (!oslog_stream_open) {
+ return;
+ }
+ selwakeup(&oslog_streamsoftc.sc_selp);
+ if (oslog_streamsoftc.sc_state & LOG_RDWAIT) {
+ wakeup((caddr_t)oslog_streambufp);
+ oslog_streamsoftc.sc_state &= ~LOG_RDWAIT;
+ }
+}
+
+void
+oslog_streamwakeup(void)
+{
+ /* cf. r24974766 & r25201228*/
+ if (oslog_is_safe() == FALSE) {
+ return;
+ }
+
+ lck_spin_lock(&oslog_stream_lock);
+ oslog_streamwakeup_locked();
+ lck_spin_unlock(&oslog_stream_lock);
+}
/*ARGSUSED*/
int
return (0);
}
+/*ARGSUSED*/
+int
+oslogioctl(__unused dev_t dev, u_long com, caddr_t data, __unused int flag, __unused struct proc *p)
+{
+ int ret = 0;
+ mach_vm_size_t buffer_size = (FIREHOSE_BUFFER_KERNEL_CHUNK_COUNT * FIREHOSE_BUFFER_CHUNK_SIZE);
+ firehose_buffer_map_info_t map_info = {0, 0};
+ firehose_buffer_t kernel_firehose_buffer = NULL;
+ mach_vm_address_t user_addr = 0;
+ mach_port_t mem_entry_ptr = MACH_PORT_NULL;
+
+ switch (com) {
+
+ /* return number of characters immediately available */
+
+ case LOGBUFFERMAP:
+ kernel_firehose_buffer = kernel_firehose_addr;
+
+ ret = mach_make_memory_entry_64(kernel_map,
+ &buffer_size,
+ (mach_vm_offset_t) kernel_firehose_buffer,
+ ( MAP_MEM_VM_SHARE | VM_PROT_READ ),
+ &mem_entry_ptr,
+ MACH_PORT_NULL);
+ if (ret == KERN_SUCCESS) {
+ ret = mach_vm_map(get_task_map(current_task()),
+ &user_addr,
+ buffer_size,
+ 0, /* mask */
+ VM_FLAGS_ANYWHERE,
+ mem_entry_ptr,
+ 0, /* offset */
+ FALSE, /* copy */
+ VM_PROT_READ,
+ VM_PROT_READ,
+ VM_INHERIT_SHARE);
+ }
+
+ if (ret == KERN_SUCCESS) {
+ map_info.fbmi_addr = (uint64_t) (user_addr);
+ map_info.fbmi_size = buffer_size;
+ bcopy(&map_info, data, sizeof(firehose_buffer_map_info_t));
+ }
+ break;
+ case LOGFLUSHED:
+ LOG_LOCK();
+ os_log_wakeup = 0;
+ LOG_UNLOCK();
+ __firehose_merge_updates(*(firehose_push_reply_t *)(data));
+ break;
+ default:
+ return (-1);
+ }
+ return (0);
+}
+
+/*ARGSUSED*/
+int
+oslog_streamioctl(__unused dev_t dev, u_long com, caddr_t data, __unused int flag, __unused struct proc *p)
+{
+ int err = 0;
+
+ lck_spin_lock(&oslog_stream_lock);
+
+ switch (com) {
+ case FIONBIO:
+ if (data && *(int *)data)
+ oslog_streamsoftc.sc_state |= LOG_NBIO;
+ else
+ oslog_streamsoftc.sc_state &= ~LOG_NBIO;
+ break;
+ case FIOASYNC:
+ if (data && *(int *)data)
+ oslog_streamsoftc.sc_state |= LOG_ASYNC;
+ else
+ oslog_streamsoftc.sc_state &= ~LOG_ASYNC;
+ break;
+ default:
+ err = -1;
+ break;
+ }
+
+ lck_spin_unlock(&oslog_stream_lock);
+ return err;
+}
+
void
bsd_log_init(void)
{
/* After this point, we must be ready to accept characters */
}
+void
+oslog_init(void)
+{
+ kern_return_t kr;
+ vm_size_t size = FIREHOSE_BUFFER_KERNEL_CHUNK_COUNT * FIREHOSE_BUFFER_CHUNK_SIZE;
+
+ oslog_lock_init();
+
+ kr = kmem_alloc_flags(kernel_map, &kernel_firehose_addr,
+ size + (2 * PAGE_SIZE), VM_KERN_MEMORY_LOG,
+ KMA_GUARD_FIRST | KMA_GUARD_LAST);
+ if (kr != KERN_SUCCESS) {
+ panic("Failed to allocate memory for firehose logging buffer");
+ }
+ kernel_firehose_addr += PAGE_SIZE;
+ bzero(kernel_firehose_addr, size);
+ /* register buffer with firehose */
+ kernel_firehose_addr = __firehose_buffer_create((size_t *) &size);
+
+ kprintf("oslog_init completed\n");
+}
/*
* log_putc_locked
mbp->msg_bufx = 0;
}
+static oslog_stream_buf_entry_t
+oslog_stream_find_free_buf_entry_locked(void)
+{
+ struct msgbuf *mbp;
+ oslog_stream_buf_entry_t buf_entry = NULL;
+
+ lck_spin_assert(&oslog_stream_lock, LCK_ASSERT_OWNED);
+
+ mbp = oslog_streambufp;
+
+ buf_entry = STAILQ_FIRST(&oslog_stream_free_head);
+ if (buf_entry) {
+ STAILQ_REMOVE_HEAD(&oslog_stream_free_head, buf_entries);
+ }
+ else {
+ // If no list elements are available in the free-list,
+ // consume the next log line so we can free up its list element
+ oslog_stream_buf_entry_t prev_entry = NULL;
+
+ buf_entry = STAILQ_FIRST(&oslog_stream_buf_head);
+ while (buf_entry->type == oslog_stream_link_type_metadata) {
+ prev_entry = buf_entry;
+ buf_entry = STAILQ_NEXT(buf_entry, buf_entries);
+ }
+
+ if (prev_entry == NULL) {
+ STAILQ_REMOVE_HEAD(&oslog_stream_buf_head, buf_entries);
+ }
+ else {
+ STAILQ_REMOVE_AFTER(&oslog_stream_buf_head, prev_entry, buf_entries);
+ }
+
+ mbp->msg_bufr += buf_entry->size;
+ oslog_s_dropped_msgcount++;
+ if (mbp->msg_bufr >= mbp->msg_size) {
+ mbp->msg_bufr = (mbp->msg_bufr % mbp->msg_size);
+ }
+ }
+
+ return buf_entry;
+}
+
+void
+oslog_streamwrite_metadata_locked(oslog_stream_buf_entry_t m_entry)
+{
+ lck_spin_assert(&oslog_stream_lock, LCK_ASSERT_OWNED);
+ STAILQ_INSERT_TAIL(&oslog_stream_buf_head, m_entry, buf_entries);
+
+ return;
+}
+
+static void oslog_streamwrite_append_bytes(const char *buffer, int buflen)
+{
+ struct msgbuf *mbp;
+
+ lck_spin_assert(&oslog_stream_lock, LCK_ASSERT_OWNED);
+
+ mbp = oslog_streambufp;
+ // Check if we have enough space in the stream buffer to write the data
+ if (mbp->msg_bufx + buflen <= mbp->msg_size) {
+ memcpy((void *)(mbp->msg_bufc + mbp->msg_bufx), buffer, buflen);
+
+ mbp->msg_bufx += buflen;
+ if (mbp->msg_bufx == mbp->msg_size) {
+ mbp->msg_bufx = 0;
+ }
+ } else {
+ // Copy part of the data until the end of the stream
+ int bytes_left = mbp->msg_size - mbp->msg_bufx;
+ memcpy((void *)(mbp->msg_bufc + mbp->msg_bufx), buffer, bytes_left);
+
+ buflen -= bytes_left;
+ buffer += bytes_left;
+
+ // Copy the remainder of the data from the beginning of stream
+ memcpy((void *)mbp->msg_bufc, buffer, buflen);
+ mbp->msg_bufx = buflen;
+ }
+ return;
+}
+
+
+void
+oslog_streamwrite_locked(firehose_tracepoint_id_u ftid,
+ uint64_t stamp, const void *pubdata, size_t publen)
+{
+ struct msgbuf *mbp;
+ int available_space = 0;
+ oslog_stream_buf_entry_t buf_entry = NULL;
+ oslog_stream_buf_entry_t next_entry = NULL;
+
+ uint16_t ft_size = offsetof(struct firehose_tracepoint_s, ft_data);
+ int ft_length = ft_size + publen;
+
+ lck_spin_assert(&oslog_stream_lock, LCK_ASSERT_OWNED);
+
+ mbp = oslog_streambufp;
+ if (ft_length > mbp->msg_size) {
+ (void)hw_atomic_add(&oslog_s_error_count, 1);
+ return;
+ }
+
+ // Ensure that we have a list element for this record
+ buf_entry = oslog_stream_find_free_buf_entry_locked();
+
+ assert(buf_entry != NULL);
+
+ // Ensure that we have space in the ring buffer for the current logline
+ if (mbp->msg_bufr > mbp->msg_bufx) {
+ available_space = mbp->msg_bufr - mbp->msg_bufx;
+ } else {
+ available_space = mbp->msg_size - mbp->msg_bufx + mbp->msg_bufr;
+ }
+ while(ft_length > available_space) {
+ oslog_stream_buf_entry_t prev_entry = NULL;
+
+ next_entry = STAILQ_FIRST(&oslog_stream_buf_head);
+ assert(next_entry != NULL);
+ while (next_entry->type == oslog_stream_link_type_metadata) {
+ prev_entry = next_entry;
+ next_entry = STAILQ_NEXT(next_entry, buf_entries);
+ }
+
+ if (prev_entry == NULL) {
+ STAILQ_REMOVE_HEAD(&oslog_stream_buf_head, buf_entries);
+ }
+ else {
+ STAILQ_REMOVE_AFTER(&oslog_stream_buf_head, prev_entry, buf_entries);
+ }
+
+ mbp->msg_bufr += next_entry->size;
+ if (mbp->msg_bufr >= mbp->msg_size) {
+ mbp->msg_bufr = (mbp->msg_bufr % mbp->msg_size);
+ }
+
+ oslog_s_dropped_msgcount++;
+ available_space += next_entry->size;
+
+ STAILQ_INSERT_TAIL(&oslog_stream_free_head, next_entry, buf_entries);
+ }
+
+ assert(ft_length <= available_space);
+
+ // Write the log line and update the list entry for this record
+ buf_entry->offset = mbp->msg_bufx;
+ buf_entry->size = ft_length;
+ buf_entry->timestamp = stamp;
+ buf_entry->type = oslog_stream_link_type_log;
+
+ // Construct a tracepoint
+ struct firehose_tracepoint_s fs = {
+ .ft_thread = thread_tid(current_thread()),
+ .ft_id.ftid_value = ftid.ftid_value,
+ .ft_length = publen
+ };
+
+ oslog_streamwrite_append_bytes((char *)&fs, sizeof(fs));
+ oslog_streamwrite_append_bytes(pubdata, publen);
+
+ assert(mbp->msg_bufr < mbp->msg_size);
+ // Insert the element to the buffer data list
+ STAILQ_INSERT_TAIL(&oslog_stream_buf_head, buf_entry, buf_entries);
+
+ return;
+}
+
+
/*
* log_putc
return 0;
}
+void oslog_setsize(int size)
+{
+ uint16_t scale = 0;
+ // If the size is less than the default stream buffer
+ // do nothing
+ if (size <= OSLOG_STREAM_BUF_SIZE) {
+ return;
+ }
+
+ scale = (uint16_t) (size / OSLOG_STREAM_BUF_SIZE);
+
+ oslog_stream_buf_size = size;
+ oslog_stream_num_entries = scale * OSLOG_NUM_STREAM_ENTRIES;
+ printf("oslog_setsize: new buffer size = %d, new num entries= %d\n", oslog_stream_buf_size, oslog_stream_num_entries);
+}
+
SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, 0, 0, sysctl_kern_msgbuf, "I", "");
static int sysctl_kern_msgbuf(struct sysctl_oid *oidp __unused,
kfree(localbuff, localbuff_size);
return (error);
}
+
projects / apple / xnu.git / blobdiff