pc-bios/s390-ccw/cio.c

   1 /*
   2  * S390 Channel I/O
   3  *
   4  * Copyright (c) 2013 Alexander Graf <agraf@suse.de>
   5  * Copyright (c) 2019 IBM Corp.
   6  *
   7  * Author(s): Jason J. Herne <jjherne@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or (at
  10  * your option) any later version. See the COPYING file in the top-level
  11  * directory.
  12  */
  13
  14 #include "libc.h"
  15 #include "s390-ccw.h"
  16 #include "s390-arch.h"
  17 #include "helper.h"
  18 #include "cio.h"
  19
  20 static char chsc_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
  21
  22 static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb);
  23
  24 int enable_mss_facility(void)
  25 {
  26     int ret;
  27     ChscAreaSda *sda_area = (ChscAreaSda *) chsc_page;
  28
  29     memset(sda_area, 0, PAGE_SIZE);
  30     sda_area->request.length = 0x0400;
  31     sda_area->request.code = 0x0031;
  32     sda_area->operation_code = 0x2;
  33
  34     ret = chsc(sda_area);
  35     if ((ret == 0) && (sda_area->response.code == 0x0001)) {
  36         return 0;
  37     }
  38     return -EIO;
  39 }
  40
  41 void enable_subchannel(SubChannelId schid)
  42 {
  43     Schib schib;
  44
  45     stsch_err(schid, &schib);
  46     schib.pmcw.ena = 1;
  47     msch(schid, &schib);
  48 }
  49
  50 uint16_t cu_type(SubChannelId schid)
  51 {
  52     SenseId sense_data;
  53     Ccw1 sense_id_ccw = {
  54         .cmd_code = CCW_CMD_SENSE_ID,
  55         .flags = CCW_FLAG_SLI,
  56         .count = sizeof(sense_data),
  57         .cda = ptr2u32(&sense_data),
  58     };
  59
  60     if (do_cio(schid, CU_TYPE_UNKNOWN, ptr2u32(&sense_id_ccw), CCW_FMT1)) {
  61         panic("Failed to run SenseID CCw\n");
  62     }
  63
  64     return sense_data.cu_type;
  65 }
  66
  67 int basic_sense(SubChannelId schid, uint16_t cutype, void *sense_data,
  68                  uint16_t data_size)
  69 {
  70     Ccw1 senseCcw = {
  71         .cmd_code = CCW_CMD_BASIC_SENSE,
  72         .count = data_size,
  73         .cda = ptr2u32(sense_data),
  74     };
  75     Irb irb;
  76
  77     return __do_cio(schid, ptr2u32(&senseCcw), CCW_FMT1, &irb);
  78 }
  79
  80 static bool irb_error(Irb *irb)
  81 {
  82     if (irb->scsw.cstat) {
  83         return true;
  84     }
  85     return irb->scsw.dstat != (SCSW_DSTAT_DEVEND | SCSW_DSTAT_CHEND);
  86 }
  87
  88 static void print_eckd_dasd_sense_data(SenseDataEckdDasd *sd)
  89 {
  90     char msgline[512];
  91
  92     if (sd->config_info & 0x8000) {
  93         sclp_print("Eckd Dasd Sense Data (fmt 24-bytes):\n");
  94     } else {
  95         sclp_print("Eckd Dasd Sense Data (fmt 32-bytes):\n");
  96     }
  97
  98     strcat(msgline, "    Sense Condition Flags :");
  99     if (sd->common_status & SNS_STAT0_CMD_REJECT) {
 100         strcat(msgline, " [Cmd-Reject]");
 101     }
 102     if (sd->common_status & SNS_STAT0_INTERVENTION_REQ) {
 103         strcat(msgline, " [Intervention-Required]");
 104     }
 105     if (sd->common_status & SNS_STAT0_BUS_OUT_CHECK) {
 106         strcat(msgline, " [Bus-Out-Parity-Check]");
 107     }
 108     if (sd->common_status & SNS_STAT0_EQUIPMENT_CHECK) {
 109         strcat(msgline, " [Equipment-Check]");
 110     }
 111     if (sd->common_status & SNS_STAT0_DATA_CHECK) {
 112         strcat(msgline, " [Data-Check]");
 113     }
 114     if (sd->common_status & SNS_STAT0_OVERRUN) {
 115         strcat(msgline, " [Overrun]");
 116     }
 117     if (sd->common_status & SNS_STAT0_INCOMPL_DOMAIN) {
 118         strcat(msgline, " [Incomplete-Domain]");
 119     }
 120
 121     if (sd->status[0] & SNS_STAT1_PERM_ERR) {
 122         strcat(msgline, " [Permanent-Error]");
 123     }
 124     if (sd->status[0] & SNS_STAT1_INV_TRACK_FORMAT) {
 125         strcat(msgline, " [Invalid-Track-Fmt]");
 126     }
 127     if (sd->status[0] & SNS_STAT1_EOC) {
 128         strcat(msgline, " [End-of-Cyl]");
 129     }
 130     if (sd->status[0] & SNS_STAT1_MESSAGE_TO_OPER) {
 131         strcat(msgline, " [Operator-Msg]");
 132     }
 133     if (sd->status[0] & SNS_STAT1_NO_REC_FOUND) {
 134         strcat(msgline, " [No-Record-Found]");
 135     }
 136     if (sd->status[0] & SNS_STAT1_FILE_PROTECTED) {
 137         strcat(msgline, " [File-Protected]");
 138     }
 139     if (sd->status[0] & SNS_STAT1_WRITE_INHIBITED) {
 140         strcat(msgline, " [Write-Inhibited]");
 141     }
 142     if (sd->status[0] & SNS_STAT1_IMPRECISE_END) {
 143         strcat(msgline, " [Imprecise-Ending]");
 144     }
 145
 146     if (sd->status[1] & SNS_STAT2_REQ_INH_WRITE) {
 147         strcat(msgline, " [Req-Inhibit-Write]");
 148     }
 149     if (sd->status[1] & SNS_STAT2_CORRECTABLE) {
 150         strcat(msgline, " [Correctable-Data-Check]");
 151     }
 152     if (sd->status[1] & SNS_STAT2_FIRST_LOG_ERR) {
 153         strcat(msgline, " [First-Error-Log]");
 154     }
 155     if (sd->status[1] & SNS_STAT2_ENV_DATA_PRESENT) {
 156         strcat(msgline, " [Env-Data-Present]");
 157     }
 158     if (sd->status[1] & SNS_STAT2_IMPRECISE_END) {
 159         strcat(msgline, " [Imprecise-End]");
 160     }
 161     strcat(msgline, "\n");
 162     sclp_print(msgline);
 163
 164     print_int("    Residual Count     =", sd->res_count);
 165     print_int("    Phys Drive ID      =", sd->phys_drive_id);
 166     print_int("    low cyl address    =", sd->low_cyl_addr);
 167     print_int("    head addr & hi cyl =", sd->head_high_cyl_addr);
 168     print_int("    format/message     =", sd->fmt_msg);
 169     print_int("    fmt-dependent[0-7] =", sd->fmt_dependent_info[0]);
 170     print_int("    fmt-dependent[8-15]=", sd->fmt_dependent_info[1]);
 171     print_int("    prog action code   =", sd->program_action_code);
 172     print_int("    Configuration info =", sd->config_info);
 173     print_int("    mcode / hi-cyl     =", sd->mcode_hicyl);
 174     print_int("    cyl & head addr [0]=", sd->cyl_head_addr[0]);
 175     print_int("    cyl & head addr [1]=", sd->cyl_head_addr[1]);
 176     print_int("    cyl & head addr [2]=", sd->cyl_head_addr[2]);
 177 }
 178
 179 static void print_irb_err(Irb *irb)
 180 {
 181     uint64_t this_ccw = *(uint64_t *)u32toptr(irb->scsw.cpa);
 182     uint64_t prev_ccw = *(uint64_t *)u32toptr(irb->scsw.cpa - 8);
 183     char msgline[256];
 184
 185     sclp_print("Interrupt Response Block Data:\n");
 186
 187     strcat(msgline, "    Function Ctrl :");
 188     if (irb->scsw.ctrl & SCSW_FCTL_START_FUNC) {
 189         strcat(msgline, " [Start]");
 190     }
 191     if (irb->scsw.ctrl & SCSW_FCTL_HALT_FUNC) {
 192         strcat(msgline, " [Halt]");
 193     }
 194     if (irb->scsw.ctrl & SCSW_FCTL_CLEAR_FUNC) {
 195         strcat(msgline, " [Clear]");
 196     }
 197     strcat(msgline, "\n");
 198     sclp_print(msgline);
 199
 200     msgline[0] = '\0';
 201     strcat(msgline, "    Activity Ctrl :");
 202     if (irb->scsw.ctrl & SCSW_ACTL_RESUME_PEND) {
 203         strcat(msgline, " [Resume-Pending]");
 204     }
 205     if (irb->scsw.ctrl & SCSW_ACTL_START_PEND) {
 206         strcat(msgline, " [Start-Pending]");
 207     }
 208     if (irb->scsw.ctrl & SCSW_ACTL_HALT_PEND) {
 209         strcat(msgline, " [Halt-Pending]");
 210     }
 211     if (irb->scsw.ctrl & SCSW_ACTL_CLEAR_PEND) {
 212         strcat(msgline, " [Clear-Pending]");
 213     }
 214     if (irb->scsw.ctrl & SCSW_ACTL_CH_ACTIVE) {
 215         strcat(msgline, " [Channel-Active]");
 216     }
 217     if (irb->scsw.ctrl & SCSW_ACTL_DEV_ACTIVE) {
 218         strcat(msgline, " [Device-Active]");
 219     }
 220     if (irb->scsw.ctrl & SCSW_ACTL_SUSPENDED) {
 221         strcat(msgline, " [Suspended]");
 222     }
 223     strcat(msgline, "\n");
 224     sclp_print(msgline);
 225
 226     msgline[0] = '\0';
 227     strcat(msgline, "    Status Ctrl :");
 228     if (irb->scsw.ctrl & SCSW_SCTL_ALERT) {
 229         strcat(msgline, " [Alert]");
 230     }
 231     if (irb->scsw.ctrl & SCSW_SCTL_INTERMED) {
 232         strcat(msgline, " [Intermediate]");
 233     }
 234     if (irb->scsw.ctrl & SCSW_SCTL_PRIMARY) {
 235         strcat(msgline, " [Primary]");
 236     }
 237     if (irb->scsw.ctrl & SCSW_SCTL_SECONDARY) {
 238         strcat(msgline, " [Secondary]");
 239     }
 240     if (irb->scsw.ctrl & SCSW_SCTL_STATUS_PEND) {
 241         strcat(msgline, " [Status-Pending]");
 242     }
 243
 244     strcat(msgline, "\n");
 245     sclp_print(msgline);
 246
 247     msgline[0] = '\0';
 248     strcat(msgline, "    Device Status :");
 249     if (irb->scsw.dstat & SCSW_DSTAT_ATTN) {
 250         strcat(msgline, " [Attention]");
 251     }
 252     if (irb->scsw.dstat & SCSW_DSTAT_STATMOD) {
 253         strcat(msgline, " [Status-Modifier]");
 254     }
 255     if (irb->scsw.dstat & SCSW_DSTAT_CUEND) {
 256         strcat(msgline, " [Ctrl-Unit-End]");
 257     }
 258     if (irb->scsw.dstat & SCSW_DSTAT_BUSY) {
 259         strcat(msgline, " [Busy]");
 260     }
 261     if (irb->scsw.dstat & SCSW_DSTAT_CHEND) {
 262         strcat(msgline, " [Channel-End]");
 263     }
 264     if (irb->scsw.dstat & SCSW_DSTAT_DEVEND) {
 265         strcat(msgline, " [Device-End]");
 266     }
 267     if (irb->scsw.dstat & SCSW_DSTAT_UCHK) {
 268         strcat(msgline, " [Unit-Check]");
 269     }
 270     if (irb->scsw.dstat & SCSW_DSTAT_UEXCP) {
 271         strcat(msgline, " [Unit-Exception]");
 272     }
 273     strcat(msgline, "\n");
 274     sclp_print(msgline);
 275
 276     msgline[0] = '\0';
 277     strcat(msgline, "    Channel Status :");
 278     if (irb->scsw.cstat & SCSW_CSTAT_PCINT) {
 279         strcat(msgline, " [Program-Ctrl-Interruption]");
 280     }
 281     if (irb->scsw.cstat & SCSW_CSTAT_BADLEN) {
 282         strcat(msgline, " [Incorrect-Length]");
 283     }
 284     if (irb->scsw.cstat & SCSW_CSTAT_PROGCHK) {
 285         strcat(msgline, " [Program-Check]");
 286     }
 287     if (irb->scsw.cstat & SCSW_CSTAT_PROTCHK) {
 288         strcat(msgline, " [Protection-Check]");
 289     }
 290     if (irb->scsw.cstat & SCSW_CSTAT_CHDCHK) {
 291         strcat(msgline, " [Channel-Data-Check]");
 292     }
 293     if (irb->scsw.cstat & SCSW_CSTAT_CHCCHK) {
 294         strcat(msgline, " [Channel-Ctrl-Check]");
 295     }
 296     if (irb->scsw.cstat & SCSW_CSTAT_ICCHK) {
 297         strcat(msgline, " [Interface-Ctrl-Check]");
 298     }
 299     if (irb->scsw.cstat & SCSW_CSTAT_CHAINCHK) {
 300         strcat(msgline, " [Chaining-Check]");
 301     }
 302     strcat(msgline, "\n");
 303     sclp_print(msgline);
 304
 305     print_int("    cpa=", irb->scsw.cpa);
 306     print_int("    prev_ccw=", prev_ccw);
 307     print_int("    this_ccw=", this_ccw);
 308 }
 309
 310 /*
 311  * Handles executing ssch, tsch and returns the irb obtained from tsch.
 312  * Returns 0 on success, -1 if unexpected status pending and we need to retry,
 313  * otherwise returns condition code from ssch/tsch for error cases.
 314  */
 315 static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb)
 316 {
 317     /*
 318      * QEMU's CIO implementation requires prefetch and 64-bit idaws. We
 319      * allow all paths.
 320      */
 321     CmdOrb orb = {
 322         .fmt = fmt,
 323         .pfch = 1,
 324         .c64 = 1,
 325         .lpm = 0xFF,
 326         .cpa = ccw_addr,
 327     };
 328     int rc;
 329
 330     IPL_assert(fmt == 0 || fmt == 1, "Invalid ccw format");
 331
 332     /* ccw_addr must be <= 24 bits and point to at least one whole ccw. */
 333     if (fmt == 0) {
 334         IPL_assert(ccw_addr <= 0xFFFFFF - 8, "Invalid ccw address");
 335     }
 336
 337     rc = ssch(schid, &orb);
 338     if (rc == 1 || rc == 2) {
 339         /* Subchannel status pending or busy. Eat status and ask for retry. */
 340         tsch(schid, irb);
 341         return -1;
 342     }
 343     if (rc) {
 344         print_int("ssch failed with cc=", rc);
 345         return rc;
 346     }
 347
 348     consume_io_int();
 349
 350     /* collect status */
 351     rc = tsch(schid, irb);
 352     if (rc) {
 353         print_int("tsch failed with cc=", rc);
 354     }
 355
 356     return rc;
 357 }
 358
 359 /*
 360  * Executes a channel program at a given subchannel. The request to run the
 361  * channel program is sent to the subchannel, we then wait for the interrupt
 362  * signaling completion of the I/O operation(s) performed by the channel
 363  * program. Lastly we verify that the i/o operation completed without error and
 364  * that the interrupt we received was for the subchannel used to run the
 365  * channel program.
 366  *
 367  * Note: This function assumes it is running in an environment where no other
 368  * cpus are generating or receiving I/O interrupts. So either run it in a
 369  * single-cpu environment or make sure all other cpus are not doing I/O and
 370  * have I/O interrupts masked off. We also assume that only one device is
 371  * active (generating i/o interrupts).
 372  *
 373  * Returns non-zero on error.
 374  */
 375 int do_cio(SubChannelId schid, uint16_t cutype, uint32_t ccw_addr, int fmt)
 376 {
 377     Irb irb = {};
 378     SenseDataEckdDasd sd;
 379     int rc, retries = 0;
 380
 381     while (true) {
 382         rc = __do_cio(schid, ccw_addr, fmt, &irb);
 383
 384         if (rc == -1) {
 385             retries++;
 386             continue;
 387         }
 388         if (rc) {
 389             /* ssch/tsch error. Message already reported by __do_cio */
 390             break;
 391         }
 392
 393         if (!irb_error(&irb)) {
 394             break;
 395         }
 396
 397         /*
 398          * Unexpected unit check, or interface-control-check. Use sense to
 399          * clear (unit check only) then retry.
 400          */
 401         if ((unit_check(&irb) || iface_ctrl_check(&irb)) && retries <= 2) {
 402             if (unit_check(&irb)) {
 403                 basic_sense(schid, cutype, &sd, sizeof(sd));
 404             }
 405             retries++;
 406             continue;
 407         }
 408
 409         sclp_print("cio device error\n");
 410         print_int("  ssid  ", schid.ssid);
 411         print_int("  cssid ", schid.cssid);
 412         print_int("  sch_no", schid.sch_no);
 413         print_int("  ctrl-unit type", cutype);
 414         sclp_print("\n");
 415         print_irb_err(&irb);
 416         if (cutype == CU_TYPE_DASD_3990 || cutype == CU_TYPE_DASD_2107 ||
 417             cutype == CU_TYPE_UNKNOWN) {
 418             if (!basic_sense(schid, cutype, &sd, sizeof(sd))) {
 419                 print_eckd_dasd_sense_data(&sd);
 420             }
 421         }
 422         rc = -1;
 423         break;
 424     }
 425
 426     return rc;
 427 }