arch/powerpc/platforms/cell/spu_coredump.c

   1 /*
   2  * SPU core dump code
   3  *
   4  * (C) Copyright 2006 IBM Corp.
   5  *
   6  * Author: Dwayne Grant McConnell <decimal@us.ibm.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/file.h>
  24 #include <linux/module.h>
  25 #include <linux/syscalls.h>
  26
  27 #include <asm/spu.h>
  28
  29 static struct spu_coredump_calls *spu_coredump_calls;
  30 static DEFINE_MUTEX(spu_coredump_mutex);
  31
  32 int arch_notes_size(void)
  33 {
  34         long ret;
  35
  36         ret = -ENOSYS;
  37         mutex_lock(&spu_coredump_mutex);
  38         if (spu_coredump_calls && try_module_get(spu_coredump_calls->owner)) {
  39                 ret = spu_coredump_calls->arch_notes_size();
  40                 module_put(spu_coredump_calls->owner);
  41         }
  42         mutex_unlock(&spu_coredump_mutex);
  43         return ret;
  44 }
  45
  46 void arch_write_notes(struct file *file)
  47 {
  48         mutex_lock(&spu_coredump_mutex);
  49         if (spu_coredump_calls && try_module_get(spu_coredump_calls->owner)) {
  50                 spu_coredump_calls->arch_write_notes(file);
  51                 module_put(spu_coredump_calls->owner);
  52         }
  53         mutex_unlock(&spu_coredump_mutex);
  54 }
  55
  56 int register_arch_coredump_calls(struct spu_coredump_calls *calls)
  57 {
  58         int ret = 0;
  59
  60
  61         mutex_lock(&spu_coredump_mutex);
  62         if (spu_coredump_calls)
  63                 ret = -EBUSY;
  64         else
  65                 spu_coredump_calls = calls;
  66         mutex_unlock(&spu_coredump_mutex);
  67         return ret;
  68 }
  69 EXPORT_SYMBOL_GPL(register_arch_coredump_calls);
  70
  71 void unregister_arch_coredump_calls(struct spu_coredump_calls *calls)
  72 {
  73         BUG_ON(spu_coredump_calls != calls);
  74
  75         mutex_lock(&spu_coredump_mutex);
  76         spu_coredump_calls = NULL;
  77         mutex_unlock(&spu_coredump_mutex);
  78 }
  79 EXPORT_SYMBOL_GPL(unregister_arch_coredump_calls);