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         struct module *owner = spu_coredump_calls.owner;
  36
  37         ret = -ENOSYS;
  38         mutex_lock(&spu_coredump_mutex);
  39         if (owner && try_module_get(owner)) {
  40                 ret = spu_coredump_calls.arch_notes_size();
  41                 module_put(owner);
  42         }
  43         mutex_unlock(&spu_coredump_mutex);
  44         return ret;
  45 }
  46
  47 void arch_write_notes(struct file *file)
  48 {
  49         struct module *owner = spu_coredump_calls.owner;
  50
  51         mutex_lock(&spu_coredump_mutex);
  52         if (owner && try_module_get(owner)) {
  53                 spu_coredump_calls.arch_write_notes(file);
  54                 module_put(owner);
  55         }
  56         mutex_unlock(&spu_coredump_mutex);
  57 }
  58
  59 int register_arch_coredump_calls(struct spu_coredump_calls *calls)
  60 {
  61         if (spu_coredump_calls.owner)
  62                 return -EBUSY;
  63
  64         mutex_lock(&spu_coredump_mutex);
  65         spu_coredump_calls.arch_notes_size = calls->arch_notes_size;
  66         spu_coredump_calls.arch_write_notes = calls->arch_write_notes;
  67         spu_coredump_calls.owner = calls->owner;
  68         mutex_unlock(&spu_coredump_mutex);
  69         return 0;
  70 }
  71 EXPORT_SYMBOL_GPL(register_arch_coredump_calls);
  72
  73 void unregister_arch_coredump_calls(struct spu_coredump_calls *calls)
  74 {
  75         BUG_ON(spu_coredump_calls.owner != calls->owner);
  76
  77         mutex_lock(&spu_coredump_mutex);
  78         spu_coredump_calls.owner = NULL;
  79         mutex_unlock(&spu_coredump_mutex);
  80 }
  81 EXPORT_SYMBOL_GPL(unregister_arch_coredump_calls);