drivers/char/snsc.h

   1 /*
   2  * SN Platform system controller communication support
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2004 Silicon Graphics, Inc. All rights reserved.
   9  */
  10
  11 /*
  12  * This file contains macros and data types for communication with the
  13  * system controllers in SGI SN systems.
  14  */
  15
  16 #ifndef _SN_SYSCTL_H_
  17 #define _SN_SYSCTL_H_
  18
  19 #include <linux/types.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/wait.h>
  22 #include <linux/kobject.h>
  23 #include <linux/fs.h>
  24 #include <linux/cdev.h>
  25 #include <asm/sn/types.h>
  26 #include <asm/semaphore.h>
  27
  28 #define CHUNKSIZE 127
  29
  30 /* This structure is used to track an open subchannel. */
  31 struct subch_data_s {
  32         nasid_t sd_nasid;       /* node on which the subchannel was opened */
  33         int sd_subch;           /* subchannel number */
  34         spinlock_t sd_rlock;    /* monitor lock for rsv */
  35         spinlock_t sd_wlock;    /* monitor lock for wsv */
  36         wait_queue_head_t sd_rq;        /* wait queue for readers */
  37         wait_queue_head_t sd_wq;        /* wait queue for writers */
  38         struct semaphore sd_rbs;        /* semaphore for read buffer */
  39         struct semaphore sd_wbs;        /* semaphore for write buffer */
  40
  41         char sd_rb[CHUNKSIZE];  /* read buffer */
  42         char sd_wb[CHUNKSIZE];  /* write buffer */
  43 };
  44
  45 struct sysctl_data_s {
  46         struct cdev scd_cdev;   /* Character device info */
  47         nasid_t scd_nasid;      /* Node on which subchannels are opened. */
  48 };
  49
  50 #endif /* _SN_SYSCTL_H_ */