arch/s390/include/asm/cio.h

   1 /*
   2  * Common interface for I/O on S/390
   3  */
   4 #ifndef _ASM_S390_CIO_H_
   5 #define _ASM_S390_CIO_H_
   6
   7 #include <linux/spinlock.h>
   8 #include <asm/types.h>
   9
  10 #define LPM_ANYPATH 0xff
  11 #define __MAX_CSSID 0
  12 #define __MAX_SUBCHANNEL 65535
  13 #define __MAX_SSID 3
  14
  15 #include <asm/scsw.h>
  16
  17 /**
  18  * struct ccw1 - channel command word
  19  * @cmd_code: command code
  20  * @flags: flags, like IDA addressing, etc.
  21  * @count: byte count
  22  * @cda: data address
  23  *
  24  * The ccw is the basic structure to build channel programs that perform
  25  * operations with the device or the control unit. Only Format-1 channel
  26  * command words are supported.
  27  */
  28 struct ccw1 {
  29         __u8  cmd_code;
  30         __u8  flags;
  31         __u16 count;
  32         __u32 cda;
  33 } __attribute__ ((packed,aligned(8)));
  34
  35 #define CCW_FLAG_DC             0x80
  36 #define CCW_FLAG_CC             0x40
  37 #define CCW_FLAG_SLI            0x20
  38 #define CCW_FLAG_SKIP           0x10
  39 #define CCW_FLAG_PCI            0x08
  40 #define CCW_FLAG_IDA            0x04
  41 #define CCW_FLAG_SUSPEND        0x02
  42
  43 #define CCW_CMD_READ_IPL        0x02
  44 #define CCW_CMD_NOOP            0x03
  45 #define CCW_CMD_BASIC_SENSE     0x04
  46 #define CCW_CMD_TIC             0x08
  47 #define CCW_CMD_STLCK           0x14
  48 #define CCW_CMD_SENSE_PGID      0x34
  49 #define CCW_CMD_SUSPEND_RECONN  0x5B
  50 #define CCW_CMD_RDC             0x64
  51 #define CCW_CMD_RELEASE         0x94
  52 #define CCW_CMD_SET_PGID        0xAF
  53 #define CCW_CMD_SENSE_ID        0xE4
  54 #define CCW_CMD_DCTL            0xF3
  55
  56 #define SENSE_MAX_COUNT         0x20
  57
  58 /**
  59  * struct erw - extended report word
  60  * @res0: reserved
  61  * @auth: authorization check
  62  * @pvrf: path-verification-required flag
  63  * @cpt: channel-path timeout
  64  * @fsavf: failing storage address validity flag
  65  * @cons: concurrent sense
  66  * @scavf: secondary ccw address validity flag
  67  * @fsaf: failing storage address format
  68  * @scnt: sense count, if @cons == %1
  69  * @res16: reserved
  70  */
  71 struct erw {
  72         __u32 res0  : 3;
  73         __u32 auth  : 1;
  74         __u32 pvrf  : 1;
  75         __u32 cpt   : 1;
  76         __u32 fsavf : 1;
  77         __u32 cons  : 1;
  78         __u32 scavf : 1;
  79         __u32 fsaf  : 1;
  80         __u32 scnt  : 6;
  81         __u32 res16 : 16;
  82 } __attribute__ ((packed));
  83
  84 /**
  85  * struct erw_eadm - EADM Subchannel extended report word
  86  * @b: aob error
  87  * @r: arsb error
  88  */
  89 struct erw_eadm {
  90         __u32 : 16;
  91         __u32 b : 1;
  92         __u32 r : 1;
  93         __u32  : 14;
  94 } __packed;
  95
  96 /**
  97  * struct sublog - subchannel logout area
  98  * @res0: reserved
  99  * @esf: extended status flags
 100  * @lpum: last path used mask
 101  * @arep: ancillary report
 102  * @fvf: field-validity flags
 103  * @sacc: storage access code
 104  * @termc: termination code
 105  * @devsc: device-status check
 106  * @serr: secondary error
 107  * @ioerr: i/o-error alert
 108  * @seqc: sequence code
 109  */
 110 struct sublog {
 111         __u32 res0  : 1;
 112         __u32 esf   : 7;
 113         __u32 lpum  : 8;
 114         __u32 arep  : 1;
 115         __u32 fvf   : 5;
 116         __u32 sacc  : 2;
 117         __u32 termc : 2;
 118         __u32 devsc : 1;
 119         __u32 serr  : 1;
 120         __u32 ioerr : 1;
 121         __u32 seqc  : 3;
 122 } __attribute__ ((packed));
 123
 124 /**
 125  * struct esw0 - Format 0 Extended Status Word (ESW)
 126  * @sublog: subchannel logout
 127  * @erw: extended report word
 128  * @faddr: failing storage address
 129  * @saddr: secondary ccw address
 130  */
 131 struct esw0 {
 132         struct sublog sublog;
 133         struct erw erw;
 134         __u32  faddr[2];
 135         __u32  saddr;
 136 } __attribute__ ((packed));
 137
 138 /**
 139  * struct esw1 - Format 1 Extended Status Word (ESW)
 140  * @zero0: reserved zeros
 141  * @lpum: last path used mask
 142  * @zero16: reserved zeros
 143  * @erw: extended report word
 144  * @zeros: three fullwords of zeros
 145  */
 146 struct esw1 {
 147         __u8  zero0;
 148         __u8  lpum;
 149         __u16 zero16;
 150         struct erw erw;
 151         __u32 zeros[3];
 152 } __attribute__ ((packed));
 153
 154 /**
 155  * struct esw2 - Format 2 Extended Status Word (ESW)
 156  * @zero0: reserved zeros
 157  * @lpum: last path used mask
 158  * @dcti: device-connect-time interval
 159  * @erw: extended report word
 160  * @zeros: three fullwords of zeros
 161  */
 162 struct esw2 {
 163         __u8  zero0;
 164         __u8  lpum;
 165         __u16 dcti;
 166         struct erw erw;
 167         __u32 zeros[3];
 168 } __attribute__ ((packed));
 169
 170 /**
 171  * struct esw3 - Format 3 Extended Status Word (ESW)
 172  * @zero0: reserved zeros
 173  * @lpum: last path used mask
 174  * @res: reserved
 175  * @erw: extended report word
 176  * @zeros: three fullwords of zeros
 177  */
 178 struct esw3 {
 179         __u8  zero0;
 180         __u8  lpum;
 181         __u16 res;
 182         struct erw erw;
 183         __u32 zeros[3];
 184 } __attribute__ ((packed));
 185
 186 /**
 187  * struct esw_eadm - EADM Subchannel Extended Status Word (ESW)
 188  * @sublog: subchannel logout
 189  * @erw: extended report word
 190  */
 191 struct esw_eadm {
 192         __u32 sublog;
 193         struct erw_eadm erw;
 194         __u32 : 32;
 195         __u32 : 32;
 196         __u32 : 32;
 197 } __packed;
 198
 199 /**
 200  * struct irb - interruption response block
 201  * @scsw: subchannel status word
 202  * @esw: extended status word
 203  * @ecw: extended control word
 204  *
 205  * The irb that is handed to the device driver when an interrupt occurs. For
 206  * solicited interrupts, the common I/O layer already performs checks whether
 207  * a field is valid; a field not being valid is always passed as %0.
 208  * If a unit check occurred, @ecw may contain sense data; this is retrieved
 209  * by the common I/O layer itself if the device doesn't support concurrent
 210  * sense (so that the device driver never needs to perform basic sene itself).
 211  * For unsolicited interrupts, the irb is passed as-is (expect for sense data,
 212  * if applicable).
 213  */
 214 struct irb {
 215         union scsw scsw;
 216         union {
 217                 struct esw0 esw0;
 218                 struct esw1 esw1;
 219                 struct esw2 esw2;
 220                 struct esw3 esw3;
 221                 struct esw_eadm eadm;
 222         } esw;
 223         __u8   ecw[32];
 224 } __attribute__ ((packed,aligned(4)));
 225
 226 /**
 227  * struct ciw - command information word  (CIW) layout
 228  * @et: entry type
 229  * @reserved: reserved bits
 230  * @ct: command type
 231  * @cmd: command code
 232  * @count: command count
 233  */
 234 struct ciw {
 235         __u32 et       :  2;
 236         __u32 reserved :  2;
 237         __u32 ct       :  4;
 238         __u32 cmd      :  8;
 239         __u32 count    : 16;
 240 } __attribute__ ((packed));
 241
 242 #define CIW_TYPE_RCD    0x0     /* read configuration data */
 243 #define CIW_TYPE_SII    0x1     /* set interface identifier */
 244 #define CIW_TYPE_RNI    0x2     /* read node identifier */
 245
 246 /*
 247  * Flags used as input parameters for do_IO()
 248  */
 249 #define DOIO_ALLOW_SUSPEND       0x0001 /* allow for channel prog. suspend */
 250 #define DOIO_DENY_PREFETCH       0x0002 /* don't allow for CCW prefetch */
 251 #define DOIO_SUPPRESS_INTER      0x0004 /* suppress intermediate inter. */
 252                                         /* ... for suspended CCWs */
 253 /* Device or subchannel gone. */
 254 #define CIO_GONE       0x0001
 255 /* No path to device. */
 256 #define CIO_NO_PATH    0x0002
 257 /* Device has appeared. */
 258 #define CIO_OPER       0x0004
 259 /* Sick revalidation of device. */
 260 #define CIO_REVALIDATE 0x0008
 261 /* Device did not respond in time. */
 262 #define CIO_BOXED      0x0010
 263
 264 /**
 265  * struct ccw_dev_id - unique identifier for ccw devices
 266  * @ssid: subchannel set id
 267  * @devno: device number
 268  *
 269  * This structure is not directly based on any hardware structure. The
 270  * hardware identifies a device by its device number and its subchannel,
 271  * which is in turn identified by its id. In order to get a unique identifier
 272  * for ccw devices across subchannel sets, @struct ccw_dev_id has been
 273  * introduced.
 274  */
 275 struct ccw_dev_id {
 276         u8 ssid;
 277         u16 devno;
 278 };
 279
 280 /**
 281  * ccw_device_id_is_equal() - compare two ccw_dev_ids
 282  * @dev_id1: a ccw_dev_id
 283  * @dev_id2: another ccw_dev_id
 284  * Returns:
 285  *  %1 if the two structures are equal field-by-field,
 286  *  %0 if not.
 287  * Context:
 288  *  any
 289  */
 290 static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
 291                                       struct ccw_dev_id *dev_id2)
 292 {
 293         if ((dev_id1->ssid == dev_id2->ssid) &&
 294             (dev_id1->devno == dev_id2->devno))
 295                 return 1;
 296         return 0;
 297 }
 298
 299 void channel_subsystem_reinit(void);
 300 extern void css_schedule_reprobe(void);
 301
 302 extern void reipl_ccw_dev(struct ccw_dev_id *id);
 303
 304 struct cio_iplinfo {
 305         u16 devno;
 306         int is_qdio;
 307 };
 308
 309 extern int cio_get_iplinfo(struct cio_iplinfo *iplinfo);
 310
 311 /* Function from drivers/s390/cio/chsc.c */
 312 int chsc_sstpc(void *page, unsigned int op, u16 ctrl);
 313 int chsc_sstpi(void *page, void *result, size_t size);
 314
 315 #endif