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incubator-nuttx/drivers/syslog/syslog_rpmsg.c

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/****************************************************************************
* drivers/syslog/syslog_rpmsg.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 <assert.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#ifdef CONFIG_ARCH_LOWPUTC
#include <nuttx/arch.h>
#endif
#include <nuttx/irq.h>
#include <nuttx/rptun/openamp.h>
#include <nuttx/syslog/syslog_rpmsg.h>
#include <nuttx/wqueue.h>
#include "syslog_rpmsg.h"
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
#if CONFIG_SYSLOG_RPMSG_WORK_DELAY
# define SYSLOG_RPMSG_WORK_DELAY MSEC2TICK(CONFIG_SYSLOG_RPMSG_WORK_DELAY)
#else
# define SYSLOG_RPMSG_WORK_DELAY MSEC2TICK(100)
#endif
#define SYSLOG_RPMSG_COUNT(p) ((p)->head - (p)->tail)
#define SYSLOG_RPMSG_SPACE(p) ((p)->size - 1 - SYSLOG_RPMSG_COUNT(p))
#define SYSLOG_RPMSG_HEADOFF(p) ((p)->head & ((p)->size -1))
#define SYSLOG_RPMSG_TAILOFF(p) ((p)->tail & ((p)->size -1))
#define SYSLOG_RPMSG_FLUSHOFF(p) ((p)->flush & ((p)->size -1))
/****************************************************************************
* Private Types
****************************************************************************/
struct syslog_rpmsg_s
{
volatile size_t head; /* The head index (where data is added) */
volatile size_t tail; /* The tail index (where data is removed) */
volatile size_t flush; /* The tail index of flush (where data is removed) */
size_t size; /* Size of the RAM buffer */
FAR char *buffer; /* Circular RAM buffer */
struct work_s work; /* Used for deferred callback work */
struct rpmsg_endpoint ept;
bool suspend;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void syslog_rpmsg_work(FAR void *priv_);
static void syslog_rpmsg_putchar(FAR struct syslog_rpmsg_s *priv, int ch,
bool last);
static void syslog_rpmsg_device_created(FAR struct rpmsg_device *rdev,
FAR void *priv_);
static void syslog_rpmsg_device_destroy(FAR struct rpmsg_device *rdev,
FAR void *priv_);
static int syslog_rpmsg_ept_cb(FAR struct rpmsg_endpoint *ept,
FAR void *data, size_t len, uint32_t src,
FAR void *priv_);
#ifdef CONFIG_SYSLOG_RPMSG_CHARDEV
static ssize_t syslog_rpmsg_file_read(FAR struct file *filep,
FAR char *buffer, size_t len);
static ssize_t syslog_rpmsg_file_write(FAR struct file *filep,
FAR const char *buffer, size_t len);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
static struct syslog_rpmsg_s g_syslog_rpmsg;
#ifdef CONFIG_SYSLOG_RPMSG_CHARDEV
static const struct file_operations g_syslog_rpmsgfops =
{
NULL, /* open */
NULL, /* close */
syslog_rpmsg_file_read, /* read */
syslog_rpmsg_file_write, /* write */
NULL, /* seek */
NULL, /* ioctl */
NULL /* poll */
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, NULL /* unlink */
#endif
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
static bool syslog_rpmsg_transfer(FAR struct syslog_rpmsg_s *priv, bool wait)
{
FAR struct syslog_rpmsg_transfer_s *msg = NULL;
irqstate_t flags;
uint32_t space;
size_t len;
size_t off;
size_t len_end;
do
{
msg = rpmsg_get_tx_payload_buffer(&priv->ept, &space, wait);
if (!msg)
{
return false;
}
memset(msg, 0, sizeof(*msg));
flags = enter_critical_section();
space -= sizeof(*msg);
len = SYSLOG_RPMSG_COUNT(priv);
off = SYSLOG_RPMSG_TAILOFF(priv);
len_end = priv->size - off;
if (len > space)
{
len = space;
}
if (len > len_end)
{
memcpy(msg->data, &priv->buffer[off], len_end);
memcpy(msg->data + len_end, priv->buffer, len - len_end);
memset(&priv->buffer[off], 0, len_end);
memset(priv->buffer, 0, len - len_end);
}
else
{
memcpy(msg->data, &priv->buffer[off], len);
memset(&priv->buffer[off], 0, len);
}
msg->count = len;
priv->tail += len;
msg->header.command = SYSLOG_RPMSG_TRANSFER;
rpmsg_send_nocopy(&priv->ept, msg, sizeof(*msg) + len);
len = SYSLOG_RPMSG_COUNT(priv);
leave_critical_section(flags);
}
while (len > 0);
return true;
}
static void syslog_rpmsg_work(FAR void *priv_)
{
FAR struct syslog_rpmsg_s *priv = priv_;
if (!syslog_rpmsg_transfer(priv, false))
{
work_queue(HPWORK, &priv->work, syslog_rpmsg_work, priv,
SYSLOG_RPMSG_WORK_DELAY);
}
}
static void syslog_rpmsg_putchar(FAR struct syslog_rpmsg_s *priv, int ch,
bool last)
{
if (priv->head + 1 - priv->tail >= priv->size)
{
if (!priv->flush && !up_interrupt_context() && !sched_idletask())
{
syslog_rpmsg_transfer(priv, true);
}
else
{
/* Overwrite */
priv->buffer[SYSLOG_RPMSG_TAILOFF(priv)] = 0;
priv->tail++;
}
}
priv->buffer[SYSLOG_RPMSG_HEADOFF(priv)] = ch & 0xff;
priv->head++;
if (priv->flush)
{
#if defined(CONFIG_ARCH_LOWPUTC)
up_putc(ch);
#endif
priv->flush++;
return;
}
if (last && !priv->suspend && is_rpmsg_ept_ready(&priv->ept))
{
clock_t delay = SYSLOG_RPMSG_WORK_DELAY;
size_t space = SYSLOG_RPMSG_SPACE(priv);
/* Start work immediately when data more then 75% and meet last */
if (space < priv->size / 4)
{
delay = 0;
}
#if CONFIG_SYSLOG_RPMSG_WORK_DELAY == 0
else
{
return;
}
#endif
work_queue(HPWORK, &priv->work, syslog_rpmsg_work, priv, delay);
}
}
static void syslog_rpmsg_device_created(FAR struct rpmsg_device *rdev,
FAR void *priv_)
{
FAR struct syslog_rpmsg_s *priv = priv_;
int ret;
if (priv->buffer && strcmp(CONFIG_SYSLOG_RPMSG_SERVER_NAME,
rpmsg_get_cpuname(rdev)) == 0)
{
priv->ept.priv = priv;
ret = rpmsg_create_ept(&priv->ept, rdev, SYSLOG_RPMSG_EPT_NAME,
RPMSG_ADDR_ANY, RPMSG_ADDR_ANY,
syslog_rpmsg_ept_cb, NULL);
if (ret == 0)
{
work_queue(HPWORK, &priv->work, syslog_rpmsg_work, priv, 0);
}
}
}
static void syslog_rpmsg_device_destroy(FAR struct rpmsg_device *rdev,
FAR void *priv_)
{
FAR struct syslog_rpmsg_s *priv = priv_;
if (priv->buffer && strcmp(CONFIG_SYSLOG_RPMSG_SERVER_NAME,
rpmsg_get_cpuname(rdev)) == 0)
{
rpmsg_destroy_ept(&priv->ept);
}
}
static int syslog_rpmsg_ept_cb(FAR struct rpmsg_endpoint *ept,
FAR void *data, size_t len, uint32_t src,
FAR void *priv_)
{
FAR struct syslog_rpmsg_s *priv = priv_;
FAR struct syslog_rpmsg_header_s *header = data;
if (header->command == SYSLOG_RPMSG_SUSPEND)
{
work_cancel(HPWORK, &priv->work);
priv->suspend = true;
}
else if (header->command == SYSLOG_RPMSG_RESUME)
{
priv->suspend = false;
work_queue(HPWORK, &priv->work, syslog_rpmsg_work, priv, 0);
}
else if (header->command == SYSLOG_RPMSG_SYNC)
{
syslog_rpmsg_transfer(priv, true);
rpmsg_send(ept, data, len);
}
return 0;
}
#ifdef CONFIG_SYSLOG_RPMSG_CHARDEV
static ssize_t syslog_rpmsg_file_read(FAR struct file *filep,
FAR char *buffer, size_t len)
{
FAR struct inode *inode = filep->f_inode;
FAR struct syslog_rpmsg_s *priv;
irqstate_t flags;
/* Some sanity checking */
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct syslog_rpmsg_s *)inode->i_private;
flags = enter_critical_section();
if (!priv->suspend && is_rpmsg_ept_ready(&priv->ept))
{
work_queue(HPWORK, &priv->work, syslog_rpmsg_work, priv, 0);
}
leave_critical_section(flags);
return 0;
}
static ssize_t syslog_rpmsg_file_write(FAR struct file *filep,
FAR const char *buffer, size_t len)
{
syslog(LOG_INFO, "%.*s", (int)len, buffer);
return len;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
int syslog_rpmsg_putc(FAR struct syslog_channel_s *channel, int ch)
{
FAR struct syslog_rpmsg_s *priv = &g_syslog_rpmsg;
irqstate_t flags;
flags = enter_critical_section();
syslog_rpmsg_putchar(priv, ch, true);
leave_critical_section(flags);
return ch;
}
int syslog_rpmsg_flush(FAR struct syslog_channel_s *channel)
{
FAR struct syslog_rpmsg_s *priv = &g_syslog_rpmsg;
irqstate_t flags;
flags = enter_critical_section();
if (priv->head - priv->flush > priv->size)
{
priv->flush = priv->tail;
}
while (priv->flush < priv->head)
{
#if defined(CONFIG_ARCH_LOWPUTC)
up_putc(priv->buffer[SYSLOG_RPMSG_FLUSHOFF(priv)]);
#endif
priv->flush++;
}
leave_critical_section(flags);
return OK;
}
ssize_t syslog_rpmsg_write(FAR struct syslog_channel_s *channel,
FAR const char *buffer, size_t buflen)
{
FAR struct syslog_rpmsg_s *priv = &g_syslog_rpmsg;
irqstate_t flags;
size_t nwritten;
flags = enter_critical_section();
for (nwritten = 1; nwritten <= buflen; nwritten++)
{
syslog_rpmsg_putchar(priv, *buffer++, nwritten == buflen);
}
leave_critical_section(flags);
return buflen;
}
void syslog_rpmsg_init_early(FAR void *buffer, size_t size)
{
FAR struct syslog_rpmsg_s *priv = &g_syslog_rpmsg;
char prev;
char cur;
size_t i;
DEBUGASSERT((size & (size - 1)) == 0);
priv->buffer = buffer;
priv->size = size;
prev = priv->buffer[size - 1];
for (i = 0; i < size; i++)
{
cur = priv->buffer[i];
if (!isascii(cur))
{
memset(priv->buffer, 0, size);
break;
}
else if (prev && !cur)
{
priv->head = i;
}
else if (!prev && cur)
{
priv->tail = i;
}
prev = cur;
}
if (i != size)
{
priv->head = priv->tail = 0;
}
else if (priv->head < priv->tail)
{
priv->head += priv->size;
}
}
int syslog_rpmsg_init(void)
{
#ifdef CONFIG_SYSLOG_RPMSG_CHARDEV
int ret;
ret = register_driver(CONFIG_SYSLOG_DEVPATH, &g_syslog_rpmsgfops,
0666, &g_syslog_rpmsg);
if (ret < 0)
{
return ret;
}
#endif
return rpmsg_register_callback(&g_syslog_rpmsg,
syslog_rpmsg_device_created,
syslog_rpmsg_device_destroy,
NULL,
NULL);
}
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