cp/include/vdevice.h

   1 /*
   2  * (C) Copyright 2007-2011  Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   3  *
   4  * This file is released under the GPLv2.  See the COPYING file for more
   5  * details.
   6  */
   7
   8 #ifndef __VDEVICE_H
   9 #define __VDEVICE_H
  10
  11 #include <list.h>
  12 #include <directory.h>
  13 #include <sched.h>
  14 #include <mutex.h>
  15 #include <spool.h>
  16 #include <vcpu.h>
  17
  18 /*
  19  * VDEV_SPOOL and VDEV_CONS related definitions
  20  */
  21 struct virt_device;
  22 struct spdev_state;
  23
  24 struct spool_ops {
  25         void (*f[16])(struct virt_sys *sys, struct virt_device *vdev,
  26                       struct ccw *ccw, struct spdev_state *st);
  27 };
  28
  29 extern struct spool_ops spool_cons_ops;         /* for VDEV_CONS */
  30
  31 struct spdev_state {
  32         u8 dev_status;  /* device/CU status */
  33         u8 sch_status;  /* subchannel status */
  34
  35         u32 addr;       /* ccw address */
  36         int f;          /* ccw format */
  37
  38         u8 *iobuf;
  39
  40         u32 rem;        /* current record remaining count */
  41         u32 pos;        /* current record remaining offset */
  42
  43         int cd;         /* chain data bool */
  44         u8  cmd;        /* chain data command */
  45
  46         int tic2tic;
  47
  48         struct spool_ops *ops;
  49 };
  50
  51 /*
  52  * The virtual device struct definition
  53  */
  54 struct virt_device {
  55         struct list_head devices;
  56
  57         /*
  58          * protects the R/W fields:
  59          *  - pmcw
  60          *  - scsw
  61          */
  62         mutex_t lock;
  63
  64         enum directory_vdevtype vtype;  /* VDEV_CONS, VDEV_DED, ... */
  65         u32 sch;                        /* subchannel id */
  66         u16 type;                       /* 3330, 3215, ... */
  67         u8 model;
  68
  69         union {
  70                 struct {
  71                         struct device *rdev;
  72                                         /* real device */
  73                 } dedicate;
  74                 struct {
  75                         struct spool_file *file;
  76                                         /* the spool file backing this dev */
  77                         struct spool_ops *ops;
  78                                         /* ops vector used for CCW exec */
  79                 } spool;
  80         } u;
  81
  82         u8 sense;                       /* sense info */
  83
  84         struct pmcw pmcw;               /* path info */
  85         struct scsw scsw;               /* subchannel-status */
  86         struct orb orb;
  87 };
  88
  89 /*
  90  * VDEV_SPOOL and VDEV_CONS: generate command reject
  91  */
  92 static inline void spooldev_cmdrej(struct virt_sys *sys,
  93                                    struct virt_device *vdev,
  94                                    struct spdev_state *st)
  95 {
  96         st->dev_status = SC_STATUS_CE | SC_STATUS_DE | SC_STATUS_UC;
  97         vdev->sense = SENSE_CMDREJ;
  98 }
  99
 100 /*
 101  * misc virtual device functions
 102  */
 103 extern int alloc_virt_dev(struct virt_sys *sys,
 104                 struct directory_vdev *dirdev, u32 sch);
 105
 106 #define for_each_vdev(sys, v)   list_for_each_entry((v), &(sys)->virt_devs, \
 107                                                     devices)
 108
 109 #endif