2014-07-03 16:18:24 +02:00
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/****************************************************************************
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* arch/arm/src/stm32/stm32_procfs_ccm.c
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*
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* Copyright (C) 2014 Pelle Windestam. All rights reserved.
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* Author: Pelle Windestam (pelle@windestam.se)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/statfs.h>
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#include <sys/stat.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/sched.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/fs/procfs.h>
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#include <nuttx/fs/dirent.h>
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#include <arch/irq.h>
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#include "stm32_ccm.h"
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#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_PROCFS)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define CCM_LINELEN 64
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This enumeration identifies all of the thread attributes that can be
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* accessed via the procfs file system.
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*/
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/* This structure describes one open "file" */
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struct ccm_file_s
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{
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2014-07-03 16:50:24 +02:00
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struct procfs_file_s base; /* Base open file structure */
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unsigned int linesize; /* Number of valid characters in line[] */
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2014-07-03 16:18:24 +02:00
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char line[CCM_LINELEN]; /* Pre-allocated buffer for formatted lines */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* File system methods */
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static int ccm_open(FAR struct file *filep, FAR const char *relpath,
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int oflags, mode_t mode);
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static int ccm_close(FAR struct file *filep);
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static ssize_t ccm_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static int ccm_dup(FAR const struct file *oldp,
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FAR struct file *newp);
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static int ccm_stat(FAR const char *relpath, FAR struct stat *buf);
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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2015-10-03 01:42:29 +02:00
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* Public Data
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2014-07-03 16:18:24 +02:00
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****************************************************************************/
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/* See include/nutts/fs/procfs.h
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* We use the old-fashioned kind of initializers so that this will compile
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* with any compiler.
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*/
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const struct procfs_operations ccm_procfsoperations =
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{
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ccm_open, /* open */
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ccm_close, /* close */
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ccm_read, /* read */
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2014-07-03 16:50:24 +02:00
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NULL, /* write */
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2014-07-03 16:18:24 +02:00
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ccm_dup, /* dup */
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2014-07-03 16:50:24 +02:00
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NULL, /* opendir */
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NULL, /* closedir */
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NULL, /* readdir */
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NULL, /* rewinddir */
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2014-07-03 16:18:24 +02:00
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ccm_stat /* stat */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ccm_open
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****************************************************************************/
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static int ccm_open(FAR struct file *filep, FAR const char *relpath,
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int oflags, mode_t mode)
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{
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FAR struct ccm_file_s *priv;
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fvdbg("Open '%s'\n", relpath);
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/* PROCFS is read-only. Any attempt to open with any kind of write
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* access is not permitted.
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*
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* REVISIT: Write-able proc files could be quite useful.
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*/
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if ((oflags & O_WRONLY) != 0 || (oflags & O_RDONLY) == 0)
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{
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fdbg("ERROR: Only O_RDONLY supported\n");
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return -EACCES;
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}
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/* "cpuload" is the only acceptable value for the relpath */
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if (strcmp(relpath, "ccm") != 0)
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{
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fdbg("ERROR: relpath is '%s'\n", relpath);
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return -ENOENT;
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}
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/* Allocate a container to hold the task and attribute selection */
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2014-09-01 01:34:44 +02:00
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priv = (FAR struct ccm_file_s *)kmm_zalloc(sizeof(struct ccm_file_s));
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2014-07-03 16:18:24 +02:00
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if (!priv)
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{
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fdbg("ERROR: Failed to allocate file attributes\n");
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return -ENOMEM;
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}
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/* Save the index as the open-specific state in filep->f_priv */
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filep->f_priv = (FAR void *)priv;
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return OK;
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}
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/****************************************************************************
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* Name: ccm_close
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****************************************************************************/
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static int ccm_close(FAR struct file *filep)
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{
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FAR struct ccm_file_s *priv;
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/* Recover our private data from the struct file instance */
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priv = (FAR struct ccm_file_s *)filep->f_priv;
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DEBUGASSERT(priv);
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/* Release the file attributes structure */
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2014-09-01 01:04:02 +02:00
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kmm_free(priv);
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filep->f_priv = NULL;
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return OK;
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}
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/****************************************************************************
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* Name: ccm_read
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****************************************************************************/
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static ssize_t ccm_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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FAR struct ccm_file_s *priv;
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size_t linesize;
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size_t copysize;
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size_t remaining;
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size_t totalsize;
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struct mallinfo mem;
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off_t offset = filep->f_pos;
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fvdbg("buffer=%p buflen=%d\n", buffer, (int)buflen);
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/* Recover our private data from the struct file instance */
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priv = (FAR struct ccm_file_s *)filep->f_priv;
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DEBUGASSERT(priv);
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mm_mallinfo(&g_ccm_heap, &mem);
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remaining = buflen;
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totalsize = 0;
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linesize = snprintf(priv->line,
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CCM_LINELEN,
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" total used free largest\n");
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copysize = procfs_memcpy(priv->line, linesize, buffer, remaining, &offset);
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totalsize += copysize;
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buffer += copysize;
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remaining -= copysize;
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if (totalsize >= buflen)
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{
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return totalsize;
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}
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linesize = snprintf(priv->line,
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CCM_LINELEN,
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"Mem: %11d%11d%11d%11d\n",
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mem.arena,
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mem.uordblks,
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mem.fordblks,
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mem.mxordblk);
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copysize = procfs_memcpy(priv->line, linesize, buffer, remaining, &offset);
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totalsize += copysize;
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/* Update the file offset */
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if (totalsize > 0)
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{
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filep->f_pos += totalsize;
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}
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return totalsize;
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}
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/****************************************************************************
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* Name: ccm_dup
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*
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* Description:
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* Duplicate open file data in the new file structure.
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*
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****************************************************************************/
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static int ccm_dup(FAR const struct file *oldp, FAR struct file *newp)
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{
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FAR struct ccm_file_s *oldpriv;
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FAR struct ccm_file_s *newpriv;
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fvdbg("Dup %p->%p\n", oldp, newp);
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/* Recover our private data from the old struct file instance */
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oldpriv = (FAR struct ccm_file_s *)oldp->f_priv;
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DEBUGASSERT(oldpriv);
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/* Allocate a new container to hold the task and attribute selection */
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2014-09-01 01:34:44 +02:00
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newpriv = (FAR struct ccm_file_s *)kmm_zalloc(sizeof(struct ccm_file_s));
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2014-07-03 16:18:24 +02:00
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if (!newpriv)
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{
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fdbg("ERROR: Failed to allocate file attributes\n");
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return -ENOMEM;
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}
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2014-07-03 16:50:24 +02:00
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/* The copy the file attributes from the old attributes to the new */
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memcpy(newpriv, oldpriv, sizeof(struct ccm_file_s));
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/* Save the new attributes in the new file structure */
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newp->f_priv = (FAR void *)newpriv;
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return OK;
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}
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static int ccm_stat(const char *relpath, struct stat *buf)
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{
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if (strcmp(relpath, "ccm") != 0)
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{
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fdbg("ERROR: relpath is '%s'\n", relpath);
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return -ENOENT;
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}
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buf->st_mode = S_IFREG|S_IROTH|S_IRGRP|S_IRUSR;
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buf->st_size = 0;
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buf->st_blksize = 0;
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buf->st_blocks = 0;
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return OK;
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}
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#endif /* !CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_PROCFS */
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