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incubator-nuttx/drivers/note/noteram_driver.c

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/****************************************************************************
* drivers/note/noteram_driver.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sched.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <nuttx/spinlock.h>
#include <nuttx/sched.h>
#include <nuttx/sched_note.h>
#include <nuttx/kmalloc.h>
#include <nuttx/note/note_driver.h>
#include <nuttx/note/noteram_driver.h>
#include <nuttx/panic_notifier.h>
#include <nuttx/fs/fs.h>
#include <nuttx/streams.h>
#ifdef CONFIG_SCHED_INSTRUMENTATION_SYSCALL
# ifdef CONFIG_LIB_SYSCALL
# include <syscall.h>
# else
# define CONFIG_LIB_SYSCALL
# include <syscall.h>
# undef CONFIG_LIB_SYSCALL
# endif
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define NCPUS CONFIG_SMP_NCPUS
/* Renumber idle task PIDs
* In NuttX, PID number less than NCPUS are idle tasks.
* In Linux, there is only one idle task of PID 0.
*/
#define get_pid(pid) ((pid) < NCPUS ? 0 : (pid))
#define get_task_state(s) \
((s) == 0 ? 'X' : ((s) <= LAST_READY_TO_RUN_STATE ? 'R' : 'S'))
/****************************************************************************
* Private Types
****************************************************************************/
struct noteram_driver_s
{
struct note_driver_s driver;
FAR uint8_t *ni_buffer;
size_t ni_bufsize;
unsigned int ni_overwrite;
volatile unsigned int ni_head;
volatile unsigned int ni_tail;
volatile unsigned int ni_read;
spinlock_t lock;
};
/* The structure to hold the context data of trace dump */
struct noteram_dump_cpu_context_s
{
int intr_nest; /* Interrupt nest level */
bool pendingswitch; /* sched_switch pending flag */
int current_state; /* Task state of the current line */
pid_t current_pid; /* Task PID of the current line */
pid_t next_pid; /* Task PID of the next line */
uint8_t current_priority; /* Task Priority of the current line */
uint8_t next_priority; /* Task Priority of the next line */
};
struct noteram_dump_context_s
{
struct noteram_dump_cpu_context_s cpu[NCPUS];
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int noteram_open(FAR struct file *filep);
static int noteram_close(FAR struct file *filep);
static ssize_t noteram_read(FAR struct file *filep,
FAR char *buffer, size_t buflen);
static int noteram_ioctl(struct file *filep, int cmd, unsigned long arg);
static void noteram_add(FAR struct note_driver_s *drv,
FAR const void *note, size_t len);
static void
noteram_dump_init_context(FAR struct noteram_dump_context_s *ctx);
static int noteram_dump_one(FAR uint8_t *p, FAR struct lib_outstream_s *s,
FAR struct noteram_dump_context_s *ctx);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_noteram_fops =
{
noteram_open, /* open */
noteram_close, /* close */
noteram_read, /* read */
NULL, /* write */
NULL, /* seek */
noteram_ioctl, /* ioctl */
};
static uint8_t g_ramnote_buffer[CONFIG_DRIVERS_NOTERAM_BUFSIZE];
static const struct note_driver_ops_s g_noteram_ops =
{
noteram_add
};
/****************************************************************************
* Public Data
****************************************************************************/
struct noteram_driver_s g_noteram_driver =
{
{&g_noteram_ops},
g_ramnote_buffer,
CONFIG_DRIVERS_NOTERAM_BUFSIZE,
#ifdef CONFIG_DRIVERS_NOTERAM_DEFAULT_NOOVERWRITE
NOTERAM_MODE_OVERWRITE_DISABLE
#else
NOTERAM_MODE_OVERWRITE_ENABLE
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: noteram_buffer_clear
*
* Description:
* Clear all contents of the circular buffer.
*
* Input Parameters:
* None.
*
* Returned Value:
* None.
*
****************************************************************************/
static void noteram_buffer_clear(FAR struct noteram_driver_s *drv)
{
drv->ni_tail = drv->ni_head;
drv->ni_read = drv->ni_head;
if (drv->ni_overwrite == NOTERAM_MODE_OVERWRITE_OVERFLOW)
{
drv->ni_overwrite = NOTERAM_MODE_OVERWRITE_DISABLE;
}
}
/****************************************************************************
* Name: noteram_next
*
* Description:
* Return the circular buffer index at offset from the specified index
* value, handling wraparound
*
* Input Parameters:
* ndx - Old circular buffer index
*
* Returned Value:
* New circular buffer index
*
****************************************************************************/
static inline unsigned int noteram_next(FAR struct noteram_driver_s *drv,
unsigned int ndx,
unsigned int offset)
{
ndx += offset;
if (ndx >= drv->ni_bufsize)
{
ndx -= drv->ni_bufsize;
}
return ndx;
}
/****************************************************************************
* Name: noteram_length
*
* Description:
* Length of data currently in circular buffer.
*
* Input Parameters:
* None
*
* Returned Value:
* Length of data currently in circular buffer.
*
****************************************************************************/
static unsigned int noteram_length(FAR struct noteram_driver_s *drv)
{
unsigned int head = drv->ni_head;
unsigned int tail = drv->ni_tail;
if (tail > head)
{
head += drv->ni_bufsize;
}
return head - tail;
}
/****************************************************************************
* Name: noteram_unread_length
*
* Description:
* Length of unread data currently in circular buffer.
*
* Input Parameters:
* None
*
* Returned Value:
* Length of unread data currently in circular buffer.
*
****************************************************************************/
static unsigned int noteram_unread_length(FAR struct noteram_driver_s *drv)
{
unsigned int head = drv->ni_head;
unsigned int read = drv->ni_read;
if (read > head)
{
head += drv->ni_bufsize;
}
return head - read;
}
/****************************************************************************
* Name: noteram_remove
*
* Description:
* Remove the variable length note from the tail of the circular buffer
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
* Assumptions:
* We are within a critical section.
*
****************************************************************************/
static void noteram_remove(FAR struct noteram_driver_s *drv)
{
unsigned int tail;
unsigned int length;
/* Get the tail index of the circular buffer */
tail = drv->ni_tail;
DEBUGASSERT(tail < drv->ni_bufsize);
/* Get the length of the note at the tail index */
length = drv->ni_buffer[tail];
DEBUGASSERT(length <= noteram_length(drv));
/* Increment the tail index to remove the entire note from the circular
* buffer.
*/
if (drv->ni_read == drv->ni_tail)
{
/* The read index also needs increment. */
drv->ni_read = noteram_next(drv, tail, length);
}
drv->ni_tail = noteram_next(drv, tail, length);
}
/****************************************************************************
* Name: noteram_get
*
* Description:
* Get the next note from the read index of the circular buffer.
*
* Input Parameters:
* buffer - Location to return the next note
* buflen - The length of the user provided buffer.
*
* Returned Value:
* On success, the positive, non-zero length of the return note is
* provided. Zero is returned only if the circular buffer is empty. A
* negated errno value is returned in the event of any failure.
*
****************************************************************************/
static ssize_t noteram_get(FAR struct noteram_driver_s *drv,
FAR uint8_t *buffer, size_t buflen)
{
FAR struct note_common_s *note;
unsigned int remaining;
unsigned int read;
ssize_t notelen;
size_t circlen;
DEBUGASSERT(buffer != NULL);
/* Verify that the circular buffer is not empty */
circlen = noteram_unread_length(drv);
if (circlen <= 0)
{
return 0;
}
/* Get the read index of the circular buffer */
read = drv->ni_read;
DEBUGASSERT(read < drv->ni_bufsize);
/* Get the length of the note at the read index */
note = (FAR struct note_common_s *)&drv->ni_buffer[read];
notelen = note->nc_length;
DEBUGASSERT(notelen <= circlen);
/* Is the user buffer large enough to hold the note? */
if (buflen < notelen)
{
/* Skip the large note so that we do not get constipated. */
drv->ni_read = noteram_next(drv, read, notelen);
/* and return an error */
return -EFBIG;
}
/* Loop until the note has been transferred to the user buffer */
remaining = (unsigned int)notelen;
while (remaining > 0)
{
/* Copy the next byte at the read index */
*buffer++ = drv->ni_buffer[read];
/* Adjust indices and counts */
read = noteram_next(drv, read, 1);
remaining--;
}
drv->ni_read = read;
return notelen;
}
/****************************************************************************
* Name: noteram_open
****************************************************************************/
static int noteram_open(FAR struct file *filep)
{
FAR struct noteram_dump_context_s *ctx;
FAR struct noteram_driver_s *drv = (FAR struct noteram_driver_s *)
filep->f_inode->i_private;
/* Reset the read index of the circular buffer */
drv->ni_read = drv->ni_tail;
ctx = kmm_zalloc(sizeof(*ctx));
if (ctx == NULL)
{
return -ENOMEM;
}
filep->f_priv = ctx;
noteram_dump_init_context(ctx);
return OK;
}
int noteram_close(FAR struct file *filep)
{
FAR struct noteram_dump_context_s *ctx = filep->f_priv;
kmm_free(ctx);
return OK;
}
/****************************************************************************
* Name: noteram_read
****************************************************************************/
static ssize_t noteram_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct noteram_dump_context_s *ctx = filep->f_priv;
FAR struct noteram_driver_s *drv = filep->f_inode->i_private;
FAR struct lib_memoutstream_s stream;
ssize_t ret;
lib_memoutstream(&stream, buffer, buflen);
do
{
irqstate_t flags;
uint8_t note[256];
/* Get the next note (removing it from the buffer) */
flags = spin_lock_irqsave_wo_note(&drv->lock);
ret = noteram_get(drv, note, sizeof(note));
spin_unlock_irqrestore_wo_note(&drv->lock, flags);
if (ret <= 0)
{
return ret;
}
/* Parse notes into text format */
ret = noteram_dump_one(note, (FAR struct lib_outstream_s *)&stream,
ctx);
}
while (ret == 0);
return ret;
}
/****************************************************************************
* Name: noteram_ioctl
****************************************************************************/
static int noteram_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
int ret = -ENOSYS;
FAR struct noteram_driver_s *drv = filep->f_inode->i_private;
irqstate_t flags = spin_lock_irqsave_wo_note(&drv->lock);
/* Handle the ioctl commands */
switch (cmd)
{
/* NOTERAM_CLEAR
* - Clear all contents of the circular buffer
* Argument: Ignored
*/
case NOTERAM_CLEAR:
noteram_buffer_clear(drv);
ret = OK;
break;
/* NOTERAM_GETMODE
* - Get overwrite mode
* Argument: A writable pointer to unsigned int
*/
case NOTERAM_GETMODE:
if (arg == 0)
{
ret = -EINVAL;
}
else
{
*(unsigned int *)arg = drv->ni_overwrite;
ret = OK;
}
break;
/* NOTERAM_SETMODE
* - Set overwrite mode
* Argument: A read-only pointer to unsigned int
*/
case NOTERAM_SETMODE:
if (arg == 0)
{
ret = -EINVAL;
}
else
{
drv->ni_overwrite = *(unsigned int *)arg;
ret = OK;
}
break;
default:
break;
}
spin_unlock_irqrestore_wo_note(&drv->lock, flags);
return ret;
}
/****************************************************************************
* Name: noteram_add
*
* Description:
* Add the variable length note to the transport layer
*
* Input Parameters:
* note - The note buffer
* notelen - The buffer length
*
* Returned Value:
* None
*
* Assumptions:
* We are within a critical section.
*
****************************************************************************/
static void noteram_add(FAR struct note_driver_s *driver,
FAR const void *note, size_t notelen)
{
FAR const char *buf = note;
FAR struct noteram_driver_s *drv = (FAR struct noteram_driver_s *)driver;
unsigned int head;
unsigned int remain;
unsigned int space;
irqstate_t flags;
flags = spin_lock_irqsave_wo_note(&drv->lock);
if (drv->ni_overwrite == NOTERAM_MODE_OVERWRITE_OVERFLOW)
{
spin_unlock_irqrestore_wo_note(&drv->lock, flags);
return;
}
DEBUGASSERT(note != NULL && notelen < drv->ni_bufsize);
remain = drv->ni_bufsize - noteram_length(drv);
if (remain < notelen)
{
if (drv->ni_overwrite == NOTERAM_MODE_OVERWRITE_DISABLE)
{
/* Stop recording if not in overwrite mode */
drv->ni_overwrite = NOTERAM_MODE_OVERWRITE_OVERFLOW;
spin_unlock_irqrestore_wo_note(&drv->lock, flags);
return;
}
/* Remove the note at the tail index , make sure there is enough space
*/
do
{
noteram_remove(drv);
remain = drv->ni_bufsize - noteram_length(drv);
}
while (remain < notelen);
}
head = drv->ni_head;
space = drv->ni_bufsize - head;
space = space < notelen ? space : notelen;
memcpy(drv->ni_buffer + head, note, space);
memcpy(drv->ni_buffer, buf + space, notelen - space);
drv->ni_head = noteram_next(drv, head, notelen);
spin_unlock_irqrestore_wo_note(&drv->lock, flags);
}
/****************************************************************************
* Name: noteram_dump_unflatten
****************************************************************************/
static void noteram_dump_unflatten(FAR void *dst, FAR uint8_t *src,
size_t len)
{
#ifdef CONFIG_ENDIAN_BIG
FAR uint8_t *end = (FAR uint8_t *)dst + len - 1;
while (len-- > 0)
{
*end-- = *src++;
}
#else
memcpy(dst, src, len);
#endif
}
/****************************************************************************
* Name: noteram_dump_init_context
****************************************************************************/
static void noteram_dump_init_context(FAR struct noteram_dump_context_s *ctx)
{
int cpu;
/* Initialize the trace dump context */
for (cpu = 0; cpu < NCPUS; cpu++)
{
ctx->cpu[cpu].intr_nest = 0;
ctx->cpu[cpu].pendingswitch = false;
ctx->cpu[cpu].current_state = TSTATE_TASK_RUNNING;
ctx->cpu[cpu].current_pid = -1;
ctx->cpu[cpu].next_pid = -1;
ctx->cpu[cpu].current_priority = -1;
ctx->cpu[cpu].next_priority = -1;
}
}
/****************************************************************************
* Name: get_task_name
****************************************************************************/
static const char *get_task_name(pid_t pid)
{
FAR const char *taskname;
taskname = note_get_taskname(pid);
if (taskname != NULL)
{
return taskname;
}
return "<noname>";
}
/****************************************************************************
* Name: noteram_dump_header
****************************************************************************/
static int noteram_dump_header(FAR struct lib_outstream_s *s,
FAR struct note_common_s *note,
FAR struct noteram_dump_context_s *ctx)
{
pid_t pid;
uint32_t nsec;
uint32_t sec;
int ret;
noteram_dump_unflatten(&nsec, note->nc_systime_nsec, sizeof(nsec));
noteram_dump_unflatten(&sec, note->nc_systime_sec, sizeof(sec));
#ifdef CONFIG_SMP
int cpu = note->nc_cpu;
#else
int cpu = 0;
#endif
noteram_dump_unflatten(&pid, note->nc_pid, sizeof(pid));
ret = lib_sprintf(s, "%8s-%-3u [%d] %3" PRIu32 ".%09" PRIu32 ": ",
get_task_name(pid), get_pid(pid), cpu, sec, nsec);
return ret;
}
#if (defined CONFIG_SCHED_INSTRUMENTATION_SWITCH) \
|| (defined CONFIG_SCHED_INSTRUMENTATION_IRQHANDLER)
/****************************************************************************
* Name: noteram_dump_sched_switch
****************************************************************************/
static int noteram_dump_sched_switch(FAR struct lib_outstream_s *s,
FAR struct note_common_s *note,
FAR struct noteram_dump_context_s *ctx)
{
FAR struct noteram_dump_cpu_context_s *cctx;
uint8_t current_priority;
uint8_t next_priority;
pid_t current_pid;
pid_t next_pid;
int ret;
#ifdef CONFIG_SMP
int cpu = note->nc_cpu;
#else
int cpu = 0;
#endif
cctx = &ctx->cpu[cpu];
current_pid = cctx->current_pid;
next_pid = cctx->next_pid;
current_priority = cctx->current_priority;
next_priority = cctx->next_priority;
ret = lib_sprintf(s, "sched_switch: prev_comm=%s prev_pid=%u "
"prev_prio=%u prev_state=%c ==> "
"next_comm=%s next_pid=%u next_prio=%u\n",
get_task_name(current_pid), get_pid(current_pid),
current_priority, get_task_state(cctx->current_state),
get_task_name(next_pid), get_pid(next_pid),
next_priority);
cctx->current_pid = cctx->next_pid;
cctx->current_priority = cctx->next_priority;
cctx->pendingswitch = false;
return ret;
}
#endif
/****************************************************************************
* Name: noteram_dump_one
****************************************************************************/
static int noteram_dump_one(FAR uint8_t *p, FAR struct lib_outstream_s *s,
FAR struct noteram_dump_context_s *ctx)
{
FAR struct note_common_s *note = (FAR struct note_common_s *)p;
FAR struct noteram_dump_cpu_context_s *cctx;
int ret = 0;
pid_t pid;
#ifdef CONFIG_SMP
int cpu = note->nc_cpu;
#else
int cpu = 0;
#endif
cctx = &ctx->cpu[cpu];
noteram_dump_unflatten(&pid, note->nc_pid, sizeof(pid));
if (cctx->current_pid < 0)
{
cctx->current_pid = pid;
}
/* Output one note */
switch (note->nc_type)
{
case NOTE_START:
{
ret += noteram_dump_header(s, note, ctx);
ret += lib_sprintf(s, "sched_wakeup_new: comm=%s pid=%d "
"target_cpu=%d\n",
get_task_name(pid), get_pid(pid), cpu);
}
break;
case NOTE_STOP:
{
/* This note informs the task to be stopped.
* Change current task state for the succeeding NOTE_RESUME.
*/
cctx->current_state = 0;
}
break;
#ifdef CONFIG_SCHED_INSTRUMENTATION_SWITCH
case NOTE_SUSPEND:
{
FAR struct note_suspend_s *nsu = (FAR struct note_suspend_s *)p;
/* This note informs the task to be suspended.
* Preserve the information for the succeeding NOTE_RESUME.
*/
cctx->current_state = nsu->nsu_state;
}
break;
case NOTE_RESUME:
{
/* This note informs the task to be resumed.
* The task switch timing depends on the running context.
*/
cctx->next_pid = pid;
cctx->next_priority = note->nc_priority;
if (cctx->intr_nest == 0)
{
/* If not in the interrupt context, the task switch is
* executed immediately.
*/
ret += noteram_dump_header(s, note, ctx);
ret += noteram_dump_sched_switch(s, note, ctx);
}
else
{
/* If in the interrupt context, the task switch is postponed
* until leaving the interrupt handler.
*/
ret += noteram_dump_header(s, note, ctx);
ret += lib_sprintf(s, "sched_waking: comm=%s "
"pid=%d target_cpu=%d\n",
get_task_name(cctx->next_pid),
get_pid(cctx->next_pid), cpu);
cctx->pendingswitch = true;
}
}
break;
#endif
#ifdef CONFIG_SCHED_INSTRUMENTATION_SYSCALL
case NOTE_SYSCALL_ENTER:
{
FAR struct note_syscall_enter_s *nsc;
int i;
int j;
uintptr_t arg;
nsc = (FAR struct note_syscall_enter_s *)p;
if (nsc->nsc_nr < CONFIG_SYS_RESERVED ||
nsc->nsc_nr >= SYS_maxsyscall)
{
break;
}
ret += noteram_dump_header(s, note, ctx);
ret += lib_sprintf(s, "sys_%s(",
g_funcnames[nsc->nsc_nr - CONFIG_SYS_RESERVED]);
for (i = j = 0; i < nsc->nsc_argc; i++)
{
noteram_dump_unflatten(&arg, nsc->nsc_args, sizeof(arg));
if (i == 0)
{
ret += lib_sprintf(s, "arg%d: 0x%" PRIxPTR, i, arg);
}
else
{
ret += lib_sprintf(s, ", arg%d: 0x%" PRIxPTR, i, arg);
}
}
ret += lib_sprintf(s, ")\n");
}
break;
case NOTE_SYSCALL_LEAVE:
{
FAR struct note_syscall_leave_s *nsc;
uintptr_t result;
nsc = (FAR struct note_syscall_leave_s *)p;
if (nsc->nsc_nr < CONFIG_SYS_RESERVED ||
nsc->nsc_nr >= SYS_maxsyscall)
{
break;
}
ret += noteram_dump_header(s, note, ctx);
noteram_dump_unflatten(&result, nsc->nsc_result, sizeof(result));
ret += lib_sprintf(s, "sys_%s -> 0x%" PRIxPTR "\n",
g_funcnames[nsc->nsc_nr - CONFIG_SYS_RESERVED],
result);
}
break;
#endif
#ifdef CONFIG_SCHED_INSTRUMENTATION_IRQHANDLER
case NOTE_IRQ_ENTER:
{
FAR struct note_irqhandler_s *nih;
nih = (FAR struct note_irqhandler_s *)p;
ret += noteram_dump_header(s, note, ctx);
ret += lib_sprintf(s, "irq_handler_entry: irq=%u name=%pS\n",
nih->nih_irq, (FAR void *)nih->nih_handler);
cctx->intr_nest++;
}
break;
case NOTE_IRQ_LEAVE:
{
FAR struct note_irqhandler_s *nih;
nih = (FAR struct note_irqhandler_s *)p;
ret += noteram_dump_header(s, note, ctx);
ret += lib_sprintf(s, "irq_handler_exit: irq=%u ret=handled\n",
nih->nih_irq);
cctx->intr_nest--;
if (cctx->intr_nest <= 0)
{
cctx->intr_nest = 0;
if (cctx->pendingswitch)
{
/* If the pending task switch exists, it is executed here */
ret += noteram_dump_header(s, note, ctx);
ret += noteram_dump_sched_switch(s, note, ctx);
}
}
}
break;
#endif
#ifdef CONFIG_SCHED_INSTRUMENTATION_CSECTION
case NOTE_CSECTION_ENTER:
case NOTE_CSECTION_LEAVE:
{
struct note_csection_s *ncs;
ncs = (FAR struct note_csection_s *)p;
ret += noteram_dump_header(s, &ncs->ncs_cmn, ctx);
ret += lib_sprintf(s, "tracing_mark_write: %c|%d|critical_section\n",
note->nc_type == NOTE_CSECTION_ENTER ?
'B' : 'E', pid);
}
break;
#endif
#ifdef CONFIG_SCHED_INSTRUMENTATION_PREEMPTION
case NOTE_PREEMPT_LOCK:
case NOTE_PREEMPT_UNLOCK:
{
struct note_preempt_s *npr;
int16_t count;
npr = (FAR struct note_preempt_s *)p;
noteram_dump_unflatten(&count, npr->npr_count, sizeof(count));
ret += noteram_dump_header(s, &npr->npr_cmn, ctx);
ret += lib_sprintf(s, "tracing_mark_write: "
"%c|%d|sched_lock:%d\n",
note->nc_type == NOTE_PREEMPT_LOCK ?
'B' : 'E', pid, count);
}
break;
#endif
#ifdef CONFIG_SCHED_INSTRUMENTATION_DUMP
case NOTE_DUMP_STRING:
{
FAR struct note_string_s *nst;
uintptr_t ip;
nst = (FAR struct note_string_s *)p;
ret += noteram_dump_header(s, note, ctx);
noteram_dump_unflatten(&ip, nst->nst_ip, sizeof(ip));
if (nst->nst_data[1] == '\0' &&
(nst->nst_data[0] == 'B' || nst->nst_data[0] == 'E'))
{
ret += lib_sprintf(s, "tracing_mark_write: %c|%d|%pS\n",
nst->nst_data[0], pid, (FAR void *)ip);
}
else
{
ret += lib_sprintf(s, "tracing_mark_write: %s\n",
nst->nst_data);
}
}
break;
case NOTE_DUMP_BINARY:
{
FAR struct note_binary_s *nbi;
uint8_t count;
uintptr_t ip;
int i;
nbi = (FAR struct note_binary_s *)p;
ret += noteram_dump_header(s, note, ctx);
count = note->nc_length - sizeof(struct note_binary_s) + 1;
noteram_dump_unflatten(&ip, nbi->nbi_ip, sizeof(ip));
ret += lib_sprintf(s, "0x%" PRIdPTR ": event=%u count=%u", ip,
nbi->nbi_event, count);
for (i = 0; i < count; i++)
{
ret += lib_sprintf(s, " 0x%x", nbi->nbi_data[i]);
}
ret += lib_sprintf(s, "\n");
}
break;
#endif
default:
break;
}
/* Return the length of the processed note */
return ret;
}
#ifdef CONFIG_DRIVERS_NOTERAM_CRASH_DUMP
/****************************************************************************
* Name: noteram_dump
****************************************************************************/
static void noteram_dump(FAR struct noteram_driver_s *drv)
{
struct noteram_dump_context_s ctx;
struct lib_syslograwstream_s stream;
uint8_t note[64];
lib_syslograwstream_open(&stream);
lib_sprintf(&stream.common, "# tracer:nop\n#\n");
while (1)
{
ssize_t ret;
ret = noteram_get(drv, note, sizeof(note));
if (ret <= 0)
{
break;
}
noteram_dump_one(note, &stream.common, &ctx);
}
lib_syslograwstream_close(&stream);
}
/****************************************************************************
* Name: noteram_crash_dump
****************************************************************************/
static int noteram_crash_dump(FAR struct notifier_block *nb,
unsigned long action, FAR void *data)
{
if (action == PANIC_KERNEL)
{
noteram_dump(&g_noteram_driver);
}
return 0;
}
static void noteram_crash_dump_register(void)
{
static struct notifier_block nb;
nb.notifier_call = noteram_crash_dump;
panic_notifier_chain_register(&nb);
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: noteram_register
*
* Description:
* Register a serial driver at /dev/note/ram that can be used by an
* application to read data from the circular note buffer.
*
* Input Parameters:
* None.
*
* Returned Value:
* Zero on succress. A negated errno value is returned on a failure.
*
****************************************************************************/
int noteram_register(void)
{
#ifdef CONFIG_DRIVERS_NOTERAM_CRASH_DUMP
noteram_crash_dump_register();
#endif
return register_driver("/dev/note/ram", &g_noteram_fops, 0666,
&g_noteram_driver);
}
/****************************************************************************
* Name: noteram_initialize
*
* Description:
* Register a serial driver at /dev/note/ram that can be used by an
* application to read data from the circular note buffer.
*
* Input Parameters:
* devpath: The path of the Noteram device
* bufsize: The size of the circular buffer
* overwrite: The overwrite mode
*
* Returned Value:
* Zero on succress. A negated errno value is returned on a failure.
*
****************************************************************************/
FAR struct note_driver_s *
noteram_initialize(FAR const char *devpath, size_t bufsize, bool overwrite)
{
FAR struct noteram_driver_s *drv;
int ret;
drv = kmm_malloc(sizeof(*drv) + bufsize);
if (drv == NULL)
{
return NULL;
}
drv->driver.ops = &g_noteram_ops;
drv->ni_bufsize = bufsize;
drv->ni_buffer = (FAR uint8_t *)(drv + 1);
drv->ni_overwrite = overwrite;
drv->ni_head = 0;
drv->ni_tail = 0;
drv->ni_read = 0;
ret = note_driver_register(&drv->driver);
if (ret < 0)
{
kmm_free(drv);
return NULL;
}
if (devpath == NULL)
{
return &drv->driver;
}
ret = register_driver(devpath, &g_noteram_fops, 0666, drv);
if (ret < 0)
{
kmm_free(drv);
return NULL;
}
return &drv->driver;
}
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