release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/s390/cio/io_sch.h

   1 #ifndef S390_IO_SCH_H
   2 #define S390_IO_SCH_H
   3
   4 #include <linux/types.h>
   5 #include <asm/schid.h>
   6 #include <asm/ccwdev.h>
   7 #include "css.h"
   8
   9 /*
  10  * command-mode operation request block
  11  */
  12 struct cmd_orb {
  13         u32 intparm;    /* interruption parameter */
  14         u32 key  : 4;   /* flags, like key, suspend control, etc. */
  15         u32 spnd : 1;   /* suspend control */
  16         u32 res1 : 1;   /* reserved */
  17         u32 mod  : 1;   /* modification control */
  18         u32 sync : 1;   /* synchronize control */
  19         u32 fmt  : 1;   /* format control */
  20         u32 pfch : 1;   /* prefetch control */
  21         u32 isic : 1;   /* initial-status-interruption control */
  22         u32 alcc : 1;   /* address-limit-checking control */
  23         u32 ssic : 1;   /* suppress-suspended-interr. control */
  24         u32 res2 : 1;   /* reserved */
  25         u32 c64  : 1;   /* IDAW/QDIO 64 bit control  */
  26         u32 i2k  : 1;   /* IDAW 2/4kB block size control */
  27         u32 lpm  : 8;   /* logical path mask */
  28         u32 ils  : 1;   /* incorrect length */
  29         u32 zero : 6;   /* reserved zeros */
  30         u32 orbx : 1;   /* ORB extension control */
  31         u32 cpa;        /* channel program address */
  32 }  __attribute__ ((packed, aligned(4)));
  33
  34 /*
  35  * transport-mode operation request block
  36  */
  37 struct tm_orb {
  38         u32 intparm;
  39         u32 key:4;
  40         u32 :9;
  41         u32 b:1;
  42         u32 :2;
  43         u32 lpm:8;
  44         u32 :7;
  45         u32 x:1;
  46         u32 tcw;
  47         u32 prio:8;
  48         u32 :8;
  49         u32 rsvpgm:8;
  50         u32 :8;
  51         u32 :32;
  52         u32 :32;
  53         u32 :32;
  54         u32 :32;
  55 }  __attribute__ ((packed, aligned(4)));
  56
  57 union orb {
  58         struct cmd_orb cmd;
  59         struct tm_orb tm;
  60 }  __attribute__ ((packed, aligned(4)));
  61
  62 struct io_subchannel_private {
  63         union orb orb;          /* operation request block */
  64         struct ccw1 sense_ccw;  /* static ccw for sense command */
  65 } __attribute__ ((aligned(8)));
  66
  67 #define to_io_private(n) ((struct io_subchannel_private *)n->private)
  68 #define sch_get_cdev(n) (dev_get_drvdata(&n->dev))
  69 #define sch_set_cdev(n, c) (dev_set_drvdata(&n->dev, c))
  70
  71 #define MAX_CIWS 8
  72
  73 /*
  74  * Possible status values for a CCW request's I/O.
  75  */
  76 enum io_status {
  77         IO_DONE,
  78         IO_RUNNING,
  79         IO_STATUS_ERROR,
  80         IO_PATH_ERROR,
  81         IO_REJECTED,
  82         IO_KILLED
  83 };
  84
  85 /**
  86  * ccw_request - Internal CCW request.
  87  * @cp: channel program to start
  88  * @timeout: maximum allowable time in jiffies between start I/O and interrupt
  89  * @maxretries: number of retries per I/O operation and path
  90  * @lpm: mask of paths to use
  91  * @check: optional callback that determines if results are final
  92  * @filter: optional callback to adjust request status based on IRB data
  93  * @callback: final callback
  94  * @data: user-defined pointer passed to all callbacks
  95  * @singlepath: if set, use only one path from @lpm per start I/O
  96  * @cancel: non-zero if request was cancelled
  97  * @done: non-zero if request was finished
  98  * @mask: current path mask
  99  * @retries: current number of retries
 100  * @drc: delayed return code
 101  */
 102 struct ccw_request {
 103         struct ccw1 *cp;
 104         unsigned long timeout;
 105         u16 maxretries;
 106         u8 lpm;
 107         int (*check)(struct ccw_device *, void *);
 108         enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
 109                                  enum io_status);
 110         void (*callback)(struct ccw_device *, void *, int);
 111         void *data;
 112         unsigned int singlepath:1;
 113         /* These fields are used internally. */
 114         unsigned int cancel:1;
 115         unsigned int done:1;
 116         u16 mask;
 117         u16 retries;
 118         int drc;
 119 } __attribute__((packed));
 120
 121 /*
 122  * sense-id response buffer layout
 123  */
 124 struct senseid {
 125         /* common part */
 126         u8  reserved;   /* always 0x'FF' */
 127         u16 cu_type;    /* control unit type */
 128         u8  cu_model;   /* control unit model */
 129         u16 dev_type;   /* device type */
 130         u8  dev_model;  /* device model */
 131         u8  unused;     /* padding byte */
 132         /* extended part */
 133         struct ciw ciw[MAX_CIWS];       /* variable # of CIWs */
 134 }  __attribute__ ((packed, aligned(4)));
 135
 136 enum cdev_todo {
 137         CDEV_TODO_NOTHING,
 138         CDEV_TODO_ENABLE_CMF,
 139         CDEV_TODO_REBIND,
 140         CDEV_TODO_REGISTER,
 141         CDEV_TODO_UNREG,
 142         CDEV_TODO_UNREG_EVAL,
 143 };
 144
 145 struct ccw_device_private {
 146         struct ccw_device *cdev;
 147         struct subchannel *sch;
 148         int state;              /* device state */
 149         atomic_t onoff;
 150         struct ccw_dev_id dev_id;       /* device id */
 151         struct subchannel_id schid;     /* subchannel number */
 152         struct ccw_request req;         /* internal I/O request */
 153         int iretry;
 154         u8 pgid_valid_mask;             /* mask of valid PGIDs */
 155         u8 pgid_todo_mask;              /* mask of PGIDs to be adjusted */
 156         struct {
 157                 unsigned int fast:1;    /* post with "channel end" */
 158                 unsigned int repall:1;  /* report every interrupt status */
 159                 unsigned int pgroup:1;  /* do path grouping */
 160                 unsigned int force:1;   /* allow forced online */
 161                 unsigned int mpath:1;   /* do multipathing */
 162         } __attribute__ ((packed)) options;
 163         struct {
 164                 unsigned int esid:1;        /* Ext. SenseID supported by HW */
 165                 unsigned int dosense:1;     /* delayed SENSE required */
 166                 unsigned int doverify:1;    /* delayed path verification */
 167                 unsigned int donotify:1;    /* call notify function */
 168                 unsigned int recog_done:1;  /* dev. recog. complete */
 169                 unsigned int fake_irb:1;    /* deliver faked irb */
 170                 unsigned int resuming:1;    /* recognition while resume */
 171                 unsigned int pgroup:1;      /* pathgroup is set up */
 172                 unsigned int mpath:1;       /* multipathing is set up */
 173                 unsigned int initialized:1; /* set if initial reference held */
 174         } __attribute__((packed)) flags;
 175         unsigned long intparm;  /* user interruption parameter */
 176         struct qdio_irq *qdio_data;
 177         struct irb irb;         /* device status */
 178         struct senseid senseid; /* SenseID info */
 179         struct pgid pgid[8];    /* path group IDs per chpid*/
 180         struct ccw1 iccws[2];   /* ccws for SNID/SID/SPGID commands */
 181         struct work_struct todo_work;
 182         enum cdev_todo todo;
 183         wait_queue_head_t wait_q;
 184         struct timer_list timer;
 185         void *cmb;                      /* measurement information */
 186         struct list_head cmb_list;      /* list of measured devices */
 187         u64 cmb_start_time;             /* clock value of cmb reset */
 188         void *cmb_wait;                 /* deferred cmb enable/disable */
 189 };
 190
 191 static inline int ssch(struct subchannel_id schid, union orb *addr)
 192 {
 193         register struct subchannel_id reg1 asm("1") = schid;
 194         int ccode = -EIO;
 195
 196         asm volatile(
 197                 "       ssch    0(%2)\n"
 198                 "0:     ipm     %0\n"
 199                 "       srl     %0,28\n"
 200                 "1:\n"
 201                 EX_TABLE(0b, 1b)
 202                 : "+d" (ccode)
 203                 : "d" (reg1), "a" (addr), "m" (*addr)
 204                 : "cc", "memory");
 205         return ccode;
 206 }
 207
 208 static inline int rsch(struct subchannel_id schid)
 209 {
 210         register struct subchannel_id reg1 asm("1") = schid;
 211         int ccode;
 212
 213         asm volatile(
 214                 "       rsch\n"
 215                 "       ipm     %0\n"
 216                 "       srl     %0,28"
 217                 : "=d" (ccode)
 218                 : "d" (reg1)
 219                 : "cc", "memory");
 220         return ccode;
 221 }
 222
 223 static inline int csch(struct subchannel_id schid)
 224 {
 225         register struct subchannel_id reg1 asm("1") = schid;
 226         int ccode;
 227
 228         asm volatile(
 229                 "       csch\n"
 230                 "       ipm     %0\n"
 231                 "       srl     %0,28"
 232                 : "=d" (ccode)
 233                 : "d" (reg1)
 234                 : "cc");
 235         return ccode;
 236 }
 237
 238 static inline int hsch(struct subchannel_id schid)
 239 {
 240         register struct subchannel_id reg1 asm("1") = schid;
 241         int ccode;
 242
 243         asm volatile(
 244                 "       hsch\n"
 245                 "       ipm     %0\n"
 246                 "       srl     %0,28"
 247                 : "=d" (ccode)
 248                 : "d" (reg1)
 249                 : "cc");
 250         return ccode;
 251 }
 252
 253 static inline int xsch(struct subchannel_id schid)
 254 {
 255         register struct subchannel_id reg1 asm("1") = schid;
 256         int ccode;
 257
 258         asm volatile(
 259                 "       .insn   rre,0xb2760000,%1,0\n"
 260                 "       ipm     %0\n"
 261                 "       srl     %0,28"
 262                 : "=d" (ccode)
 263                 : "d" (reg1)
 264                 : "cc");
 265         return ccode;
 266 }
 267
 268 #endif