Subversion Repositories or1k

/*

 *      Copyright (C) 1995-1997 Claus-Justus Heine.

 This program is free software; you can redistribute it and/or modify

 it under the terms of the GNU General Public License as published by

 the Free Software Foundation; either version 2, or (at your option)

 any later version.

 This program is distributed in the hope that it will be useful,

 but WITHOUT ANY WARRANTY; without even the implied warranty of

 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License

 along with this program; see the file COPYING.  If not, write to

 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

 *

 * $Source: /home/marcus/revision_ctrl_test/oc_cvs/cvs/or1k/linux/linux-2.4/drivers/char/ftape/zftape/zftape-buffers.c,v $

 * $Revision: 1.1.1.1 $

 * $Date: 2004-04-15 02:02:31 $

 *

 *      This file contains the dynamic buffer allocation routines

 *      of zftape

 */

#include <linux/errno.h>

#include <linux/mm.h>

#include <linux/slab.h>

#include <asm/segment.h>

#include <linux/zftape.h>

#if LINUX_VERSION_CODE >= KERNEL_VER(2,1,0)

#include <linux/vmalloc.h>

#endif

#include "../zftape/zftape-init.h"

#include "../zftape/zftape-eof.h"

#include "../zftape/zftape-ctl.h"

#include "../zftape/zftape-write.h"

#include "../zftape/zftape-read.h"

#include "../zftape/zftape-rw.h"

#include "../zftape/zftape-vtbl.h"

/*  global variables

 */

/*  local varibales

 */

static unsigned int used_memory;

static unsigned int peak_memory;

void zft_memory_stats(void)

{

        TRACE_FUN(ft_t_flow);

        TRACE(ft_t_noise, "Memory usage (vmalloc allocations):\n"

              KERN_INFO "total allocated: %d\n"

              KERN_INFO "peak allocation: %d",

              used_memory, peak_memory);

        peak_memory = used_memory;

        TRACE_EXIT;

}

int zft_vcalloc_once(void *new, size_t size)

{

        TRACE_FUN(ft_t_flow);

        if (zft_vmalloc_once(new, size) < 0) {

                TRACE_EXIT -ENOMEM;

        }

        memset(*(void **)new, '\0', size);

        TRACE_EXIT 0;

}

int zft_vmalloc_once(void *new, size_t size)

{

        TRACE_FUN(ft_t_flow);

        if (*(void **)new != NULL || size == 0) {

                TRACE_EXIT 0;

        }

        if ((*(void **)new = vmalloc(size)) == NULL) {

                TRACE_EXIT -ENOMEM;

        }

        used_memory += size;

        if (peak_memory < used_memory) {

                peak_memory = used_memory;

        }

        TRACE_ABORT(0, ft_t_noise,

                    "allocated buffer @ %p, %d bytes", *(void **)new, size);

}

int zft_vcalloc_always(void *new, size_t size)

{

        TRACE_FUN(ft_t_flow);

        zft_vfree(new, size);

        TRACE_EXIT zft_vcalloc_once(new, size);

}

int zft_vmalloc_always(void *new, size_t size)

{

        TRACE_FUN(ft_t_flow);

        zft_vfree(new, size);

        TRACE_EXIT zft_vmalloc_once(new, size);

}

void zft_vfree(void *old, size_t size)

{

        TRACE_FUN(ft_t_flow);

        if (*(void **)old) {

                vfree(*(void **)old);

                used_memory -= size;

                TRACE(ft_t_noise, "released buffer @ %p, %d bytes",

                      *(void **)old, size);

                *(void **)old = NULL;

        }

        TRACE_EXIT;

}

void *zft_kmalloc(size_t size)

{

        void *new;

        while ((new = kmalloc(size, GFP_KERNEL)) == NULL) {

                current->state   = TASK_INTERRUPTIBLE;

                schedule_timeout(HZ/10);

        }

        memset(new, 0, size);

        used_memory += size;

        if (peak_memory < used_memory) {

                peak_memory = used_memory;

        }

        return new;

}

void zft_kfree(void *old, size_t size)

{

        kfree(old);

        used_memory -= size;

}

/* there are some more buffers that are allocated on demand.

 * cleanup_module() calles this function to be sure to have released

 * them

 */

void zft_uninit_mem(void)

{

        TRACE_FUN(ft_t_flow);

        zft_vfree(&zft_hseg_buf, FT_SEGMENT_SIZE);

        zft_vfree(&zft_deblock_buf, FT_SEGMENT_SIZE); zft_deblock_segment = -1;

        zft_free_vtbl();

        if (zft_cmpr_lock(0 /* don't load */) == 0) {

                (*zft_cmpr_ops->cleanup)();

                (*zft_cmpr_ops->reset)(); /* unlock it again */

        }

        zft_memory_stats();

        TRACE_EXIT;

}