linux/drivers/s390/cio/chsc.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *   S/390 common I/O routines -- channel subsystem call
   4 *
   5 *    Copyright IBM Corp. 1999,2012
   6 *    Author(s): Ingo Adlung (adlung@de.ibm.com)
   7 *               Cornelia Huck (cornelia.huck@de.ibm.com)
   8 *               Arnd Bergmann (arndb@de.ibm.com)
   9 */
  10
  11#define KMSG_COMPONENT "cio"
  12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14#include <linux/module.h>
  15#include <linux/slab.h>
  16#include <linux/init.h>
  17#include <linux/device.h>
  18#include <linux/mutex.h>
  19#include <linux/pci.h>
  20
  21#include <asm/cio.h>
  22#include <asm/chpid.h>
  23#include <asm/chsc.h>
  24#include <asm/crw.h>
  25#include <asm/isc.h>
  26#include <asm/ebcdic.h>
  27#include <asm/ap.h>
  28
  29#include "css.h"
  30#include "cio.h"
  31#include "cio_debug.h"
  32#include "ioasm.h"
  33#include "chp.h"
  34#include "chsc.h"
  35
  36static void *sei_page;
  37static void *chsc_page;
  38static DEFINE_SPINLOCK(chsc_page_lock);
  39
  40#define SEI_VF_FLA      0xc0 /* VF flag for Full Link Address */
  41#define SEI_RS_CHPID    0x4  /* 4 in RS field indicates CHPID */
  42
  43/**
  44 * chsc_error_from_response() - convert a chsc response to an error
  45 * @response: chsc response code
  46 *
  47 * Returns an appropriate Linux error code for @response.
  48 */
  49int chsc_error_from_response(int response)
  50{
  51        switch (response) {
  52        case 0x0001:
  53                return 0;
  54        case 0x0002:
  55        case 0x0003:
  56        case 0x0006:
  57        case 0x0007:
  58        case 0x0008:
  59        case 0x000a:
  60        case 0x0104:
  61                return -EINVAL;
  62        case 0x0004:
  63        case 0x0106:            /* "Wrong Channel Parm" for the op 0x003d */
  64                return -EOPNOTSUPP;
  65        case 0x000b:
  66        case 0x0107:            /* "Channel busy" for the op 0x003d */
  67                return -EBUSY;
  68        case 0x0100:
  69        case 0x0102:
  70                return -ENOMEM;
  71        case 0x0108:            /* "HW limit exceeded" for the op 0x003d */
  72                return -EUSERS;
  73        default:
  74                return -EIO;
  75        }
  76}
  77EXPORT_SYMBOL_GPL(chsc_error_from_response);
  78
  79struct chsc_ssd_area {
  80        struct chsc_header request;
  81        u16 :10;
  82        u16 ssid:2;
  83        u16 :4;
  84        u16 f_sch;        /* first subchannel */
  85        u16 :16;
  86        u16 l_sch;        /* last subchannel */
  87        u32 :32;
  88        struct chsc_header response;
  89        u32 :32;
  90        u8 sch_valid : 1;
  91        u8 dev_valid : 1;
  92        u8 st        : 3; /* subchannel type */
  93        u8 zeroes    : 3;
  94        u8  unit_addr;    /* unit address */
  95        u16 devno;        /* device number */
  96        u8 path_mask;
  97        u8 fla_valid_mask;
  98        u16 sch;          /* subchannel */
  99        u8 chpid[8];      /* chpids 0-7 */
 100        u16 fla[8];       /* full link addresses 0-7 */
 101} __packed __aligned(PAGE_SIZE);
 102
 103int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
 104{
 105        struct chsc_ssd_area *ssd_area;
 106        unsigned long flags;
 107        int ccode;
 108        int ret;
 109        int i;
 110        int mask;
 111
 112        spin_lock_irqsave(&chsc_page_lock, flags);
 113        memset(chsc_page, 0, PAGE_SIZE);
 114        ssd_area = chsc_page;
 115        ssd_area->request.length = 0x0010;
 116        ssd_area->request.code = 0x0004;
 117        ssd_area->ssid = schid.ssid;
 118        ssd_area->f_sch = schid.sch_no;
 119        ssd_area->l_sch = schid.sch_no;
 120
 121        ccode = chsc(ssd_area);
 122        /* Check response. */
 123        if (ccode > 0) {
 124                ret = (ccode == 3) ? -ENODEV : -EBUSY;
 125                goto out;
 126        }
 127        ret = chsc_error_from_response(ssd_area->response.code);
 128        if (ret != 0) {
 129                CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 130                              schid.ssid, schid.sch_no,
 131                              ssd_area->response.code);
 132                goto out;
 133        }
 134        if (!ssd_area->sch_valid) {
 135                ret = -ENODEV;
 136                goto out;
 137        }
 138        /* Copy data */
 139        ret = 0;
 140        memset(ssd, 0, sizeof(struct chsc_ssd_info));
 141        if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 142            (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 143                goto out;
 144        ssd->path_mask = ssd_area->path_mask;
 145        ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 146        for (i = 0; i < 8; i++) {
 147                mask = 0x80 >> i;
 148                if (ssd_area->path_mask & mask) {
 149                        chp_id_init(&ssd->chpid[i]);
 150                        ssd->chpid[i].id = ssd_area->chpid[i];
 151                }
 152                if (ssd_area->fla_valid_mask & mask)
 153                        ssd->fla[i] = ssd_area->fla[i];
 154        }
 155out:
 156        spin_unlock_irqrestore(&chsc_page_lock, flags);
 157        return ret;
 158}
 159
 160/**
 161 * chsc_ssqd() - store subchannel QDIO data (SSQD)
 162 * @schid: id of the subchannel on which SSQD is performed
 163 * @ssqd: request and response block for SSQD
 164 *
 165 * Returns 0 on success.
 166 */
 167int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 168{
 169        memset(ssqd, 0, sizeof(*ssqd));
 170        ssqd->request.length = 0x0010;
 171        ssqd->request.code = 0x0024;
 172        ssqd->first_sch = schid.sch_no;
 173        ssqd->last_sch = schid.sch_no;
 174        ssqd->ssid = schid.ssid;
 175
 176        if (chsc(ssqd))
 177                return -EIO;
 178
 179        return chsc_error_from_response(ssqd->response.code);
 180}
 181EXPORT_SYMBOL_GPL(chsc_ssqd);
 182
 183/**
 184 * chsc_sadc() - set adapter device controls (SADC)
 185 * @schid: id of the subchannel on which SADC is performed
 186 * @scssc: request and response block for SADC
 187 * @summary_indicator_addr: summary indicator address
 188 * @subchannel_indicator_addr: subchannel indicator address
 189 * @isc: Interruption Subclass for this subchannel
 190 *
 191 * Returns 0 on success.
 192 */
 193int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
 194              u64 summary_indicator_addr, u64 subchannel_indicator_addr, u8 isc)
 195{
 196        memset(scssc, 0, sizeof(*scssc));
 197        scssc->request.length = 0x0fe0;
 198        scssc->request.code = 0x0021;
 199        scssc->operation_code = 0;
 200
 201        scssc->summary_indicator_addr = summary_indicator_addr;
 202        scssc->subchannel_indicator_addr = subchannel_indicator_addr;
 203
 204        scssc->ks = PAGE_DEFAULT_KEY >> 4;
 205        scssc->kc = PAGE_DEFAULT_KEY >> 4;
 206        scssc->isc = isc;
 207        scssc->schid = schid;
 208
 209        /* enable the time delay disablement facility */
 210        if (css_general_characteristics.aif_tdd)
 211                scssc->word_with_d_bit = 0x10000000;
 212
 213        if (chsc(scssc))
 214                return -EIO;
 215
 216        return chsc_error_from_response(scssc->response.code);
 217}
 218EXPORT_SYMBOL_GPL(chsc_sadc);
 219
 220static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 221{
 222        spin_lock_irq(sch->lock);
 223        if (sch->driver && sch->driver->chp_event)
 224                if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 225                        goto out_unreg;
 226        spin_unlock_irq(sch->lock);
 227        return 0;
 228
 229out_unreg:
 230        sch->lpm = 0;
 231        spin_unlock_irq(sch->lock);
 232        css_schedule_eval(sch->schid);
 233        return 0;
 234}
 235
 236void chsc_chp_offline(struct chp_id chpid)
 237{
 238        struct channel_path *chp = chpid_to_chp(chpid);
 239        struct chp_link link;
 240        char dbf_txt[15];
 241
 242        sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 243        CIO_TRACE_EVENT(2, dbf_txt);
 244
 245        if (chp_get_status(chpid) <= 0)
 246                return;
 247        memset(&link, 0, sizeof(struct chp_link));
 248        link.chpid = chpid;
 249        /* Wait until previous actions have settled. */
 250        css_wait_for_slow_path();
 251
 252        mutex_lock(&chp->lock);
 253        chp_update_desc(chp);
 254        mutex_unlock(&chp->lock);
 255
 256        for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 257}
 258
 259static int __s390_process_res_acc(struct subchannel *sch, void *data)
 260{
 261        spin_lock_irq(sch->lock);
 262        if (sch->driver && sch->driver->chp_event)
 263                sch->driver->chp_event(sch, data, CHP_ONLINE);
 264        spin_unlock_irq(sch->lock);
 265
 266        return 0;
 267}
 268
 269static void s390_process_res_acc(struct chp_link *link)
 270{
 271        char dbf_txt[15];
 272
 273        sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 274                link->chpid.id);
 275        CIO_TRACE_EVENT( 2, dbf_txt);
 276        if (link->fla != 0) {
 277                sprintf(dbf_txt, "fla%x", link->fla);
 278                CIO_TRACE_EVENT( 2, dbf_txt);
 279        }
 280        /* Wait until previous actions have settled. */
 281        css_wait_for_slow_path();
 282        /*
 283         * I/O resources may have become accessible.
 284         * Scan through all subchannels that may be concerned and
 285         * do a validation on those.
 286         * The more information we have (info), the less scanning
 287         * will we have to do.
 288         */
 289        for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
 290        css_schedule_reprobe();
 291}
 292
 293static int process_fces_event(struct subchannel *sch, void *data)
 294{
 295        spin_lock_irq(sch->lock);
 296        if (sch->driver && sch->driver->chp_event)
 297                sch->driver->chp_event(sch, data, CHP_FCES_EVENT);
 298        spin_unlock_irq(sch->lock);
 299        return 0;
 300}
 301
 302struct chsc_sei_nt0_area {
 303        u8  flags;
 304        u8  vf;                         /* validity flags */
 305        u8  rs;                         /* reporting source */
 306        u8  cc;                         /* content code */
 307        u16 fla;                        /* full link address */
 308        u16 rsid;                       /* reporting source id */
 309        u32 reserved1;
 310        u32 reserved2;
 311        /* ccdf has to be big enough for a link-incident record */
 312        u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 313} __packed;
 314
 315struct chsc_sei_nt2_area {
 316        u8  flags;                      /* p and v bit */
 317        u8  reserved1;
 318        u8  reserved2;
 319        u8  cc;                         /* content code */
 320        u32 reserved3[13];
 321        u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 322} __packed;
 323
 324#define CHSC_SEI_NT0    (1ULL << 63)
 325#define CHSC_SEI_NT2    (1ULL << 61)
 326
 327struct chsc_sei {
 328        struct chsc_header request;
 329        u32 reserved1;
 330        u64 ntsm;                       /* notification type mask */
 331        struct chsc_header response;
 332        u32 :24;
 333        u8 nt;
 334        union {
 335                struct chsc_sei_nt0_area nt0_area;
 336                struct chsc_sei_nt2_area nt2_area;
 337                u8 nt_area[PAGE_SIZE - 24];
 338        } u;
 339} __packed __aligned(PAGE_SIZE);
 340
 341/*
 342 * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
 343 */
 344
 345#define LIR_IQ_CLASS_INFO               0
 346#define LIR_IQ_CLASS_DEGRADED           1
 347#define LIR_IQ_CLASS_NOT_OPERATIONAL    2
 348
 349struct lir {
 350        struct {
 351                u32 null:1;
 352                u32 reserved:3;
 353                u32 class:2;
 354                u32 reserved2:2;
 355        } __packed iq;
 356        u32 ic:8;
 357        u32 reserved:16;
 358        struct node_descriptor incident_node;
 359        struct node_descriptor attached_node;
 360        u8 reserved2[32];
 361} __packed;
 362
 363#define PARAMS_LEN      10      /* PARAMS=xx,xxxxxx */
 364#define NODEID_LEN      35      /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 365
 366/* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
 367static char *store_ebcdic(char *dest, const char *src, unsigned long len,
 368                          char delim)
 369{
 370        memcpy(dest, src, len);
 371        EBCASC(dest, len);
 372
 373        if (delim)
 374                dest[len++] = delim;
 375
 376        return dest + len;
 377}
 378
 379static void chsc_link_from_sei(struct chp_link *link,
 380                                struct chsc_sei_nt0_area *sei_area)
 381{
 382        if ((sei_area->vf & SEI_VF_FLA) != 0) {
 383                link->fla       = sei_area->fla;
 384                link->fla_mask  = ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ?
 385                                                        0xffff : 0xff00;
 386        }
 387}
 388
 389/* Format node ID and parameters for output in LIR log message. */
 390static void format_node_data(char *params, char *id, struct node_descriptor *nd)
 391{
 392        memset(params, 0, PARAMS_LEN);
 393        memset(id, 0, NODEID_LEN);
 394
 395        if (nd->validity != ND_VALIDITY_VALID) {
 396                strncpy(params, "n/a", PARAMS_LEN - 1);
 397                strncpy(id, "n/a", NODEID_LEN - 1);
 398                return;
 399        }
 400
 401        /* PARAMS=xx,xxxxxx */
 402        snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
 403        /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 404        id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
 405        id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
 406        id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
 407        id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
 408        id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
 409        sprintf(id, "%04X", nd->tag);
 410}
 411
 412static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 413{
 414        struct lir *lir = (struct lir *) &sei_area->ccdf;
 415        char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
 416             aunodeid[NODEID_LEN];
 417
 418        CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
 419                      sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
 420
 421        /* Ignore NULL Link Incident Records. */
 422        if (lir->iq.null)
 423                return;
 424
 425        /* Inform user that a link requires maintenance actions because it has
 426         * become degraded or not operational. Note that this log message is
 427         * the primary intention behind a Link Incident Record. */
 428
 429        format_node_data(iuparams, iunodeid, &lir->incident_node);
 430        format_node_data(auparams, aunodeid, &lir->attached_node);
 431
 432        switch (lir->iq.class) {
 433        case LIR_IQ_CLASS_DEGRADED:
 434                pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
 435                        "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 436                        sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 437                        iunodeid, auparams, aunodeid);
 438                break;
 439        case LIR_IQ_CLASS_NOT_OPERATIONAL:
 440                pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
 441                       "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 442                       sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 443                       iunodeid, auparams, aunodeid);
 444                break;
 445        default:
 446                break;
 447        }
 448}
 449
 450static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 451{
 452        struct channel_path *chp;
 453        struct chp_link link;
 454        struct chp_id chpid;
 455        int status;
 456
 457        CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 458                      "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 459        if (sei_area->rs != 4)
 460                return;
 461        chp_id_init(&chpid);
 462        chpid.id = sei_area->rsid;
 463        /* allocate a new channel path structure, if needed */
 464        status = chp_get_status(chpid);
 465        if (!status)
 466                return;
 467
 468        if (status < 0) {
 469                chp_new(chpid);
 470        } else {
 471                chp = chpid_to_chp(chpid);
 472                mutex_lock(&chp->lock);
 473                chp_update_desc(chp);
 474                mutex_unlock(&chp->lock);
 475        }
 476        memset(&link, 0, sizeof(struct chp_link));
 477        link.chpid = chpid;
 478        chsc_link_from_sei(&link, sei_area);
 479        s390_process_res_acc(&link);
 480}
 481
 482static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 483{
 484        struct channel_path *chp;
 485        struct chp_id chpid;
 486        u8 *data;
 487        int num;
 488
 489        CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 490        if (sei_area->rs != 0)
 491                return;
 492        data = sei_area->ccdf;
 493        chp_id_init(&chpid);
 494        for (num = 0; num <= __MAX_CHPID; num++) {
 495                if (!chp_test_bit(data, num))
 496                        continue;
 497                chpid.id = num;
 498
 499                CIO_CRW_EVENT(4, "Update information for channel path "
 500                              "%x.%02x\n", chpid.cssid, chpid.id);
 501                chp = chpid_to_chp(chpid);
 502                if (!chp) {
 503                        chp_new(chpid);
 504                        continue;
 505                }
 506                mutex_lock(&chp->lock);
 507                chp_update_desc(chp);
 508                mutex_unlock(&chp->lock);
 509        }
 510}
 511
 512struct chp_config_data {
 513        u8 map[32];
 514        u8 op;
 515        u8 pc;
 516};
 517
 518static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 519{
 520        struct chp_config_data *data;
 521        struct chp_id chpid;
 522        int num;
 523        char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 524
 525        CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 526        if (sei_area->rs != 0)
 527                return;
 528        data = (struct chp_config_data *) &(sei_area->ccdf);
 529        chp_id_init(&chpid);
 530        for (num = 0; num <= __MAX_CHPID; num++) {
 531                if (!chp_test_bit(data->map, num))
 532                        continue;
 533                chpid.id = num;
 534                pr_notice("Processing %s for channel path %x.%02x\n",
 535                          events[data->op], chpid.cssid, chpid.id);
 536                switch (data->op) {
 537                case 0:
 538                        chp_cfg_schedule(chpid, 1);
 539                        break;
 540                case 1:
 541                        chp_cfg_schedule(chpid, 0);
 542                        break;
 543                case 2:
 544                        chp_cfg_cancel_deconfigure(chpid);
 545                        break;
 546                }
 547        }
 548}
 549
 550static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 551{
 552        int ret;
 553
 554        CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 555        if (sei_area->rs != 7)
 556                return;
 557
 558        ret = scm_update_information();
 559        if (ret)
 560                CIO_CRW_EVENT(0, "chsc: updating change notification"
 561                              " failed (rc=%d).\n", ret);
 562}
 563
 564static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 565{
 566        int ret;
 567
 568        CIO_CRW_EVENT(4, "chsc: scm available information\n");
 569        if (sei_area->rs != 7)
 570                return;
 571
 572        ret = scm_process_availability_information();
 573        if (ret)
 574                CIO_CRW_EVENT(0, "chsc: process availability information"
 575                              " failed (rc=%d).\n", ret);
 576}
 577
 578static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
 579{
 580        CIO_CRW_EVENT(3, "chsc: ap config changed\n");
 581        if (sei_area->rs != 5)
 582                return;
 583
 584        ap_bus_cfg_chg();
 585}
 586
 587static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area)
 588{
 589        struct chp_link link;
 590        struct chp_id chpid;
 591        struct channel_path *chp;
 592
 593        CIO_CRW_EVENT(4,
 594        "chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n",
 595                sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
 596
 597        if (sei_area->rs != SEI_RS_CHPID)
 598                return;
 599        chp_id_init(&chpid);
 600        chpid.id = sei_area->rsid;
 601
 602        /* Ignore the event on unknown/invalid chp */
 603        chp = chpid_to_chp(chpid);
 604        if (!chp)
 605                return;
 606
 607        memset(&link, 0, sizeof(struct chp_link));
 608        link.chpid = chpid;
 609        chsc_link_from_sei(&link, sei_area);
 610
 611        for_each_subchannel_staged(process_fces_event, NULL, &link);
 612}
 613
 614static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 615{
 616        switch (sei_area->cc) {
 617        case 1:
 618                zpci_event_error(sei_area->ccdf);
 619                break;
 620        case 2:
 621                zpci_event_availability(sei_area->ccdf);
 622                break;
 623        default:
 624                CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 625                              sei_area->cc);
 626                break;
 627        }
 628}
 629
 630static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 631{
 632        /* which kind of information was stored? */
 633        switch (sei_area->cc) {
 634        case 1: /* link incident*/
 635                chsc_process_sei_link_incident(sei_area);
 636                break;
 637        case 2: /* i/o resource accessibility */
 638                chsc_process_sei_res_acc(sei_area);
 639                break;
 640        case 3: /* ap config changed */
 641                chsc_process_sei_ap_cfg_chg(sei_area);
 642                break;
 643        case 7: /* channel-path-availability information */
 644                chsc_process_sei_chp_avail(sei_area);
 645                break;
 646        case 8: /* channel-path-configuration notification */
 647                chsc_process_sei_chp_config(sei_area);
 648                break;
 649        case 12: /* scm change notification */
 650                chsc_process_sei_scm_change(sei_area);
 651                break;
 652        case 14: /* scm available notification */
 653                chsc_process_sei_scm_avail(sei_area);
 654                break;
 655        case 15: /* FCES event notification */
 656                chsc_process_sei_fces_event(sei_area);
 657                break;
 658        default: /* other stuff */
 659                CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 660                              sei_area->cc);
 661                break;
 662        }
 663
 664        /* Check if we might have lost some information. */
 665        if (sei_area->flags & 0x40) {
 666                CIO_CRW_EVENT(2, "chsc: event overflow\n");
 667                css_schedule_eval_all();
 668        }
 669}
 670
 671static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 672{
 673        static int ntsm_unsupported;
 674
 675        while (true) {
 676                memset(sei, 0, sizeof(*sei));
 677                sei->request.length = 0x0010;
 678                sei->request.code = 0x000e;
 679                if (!ntsm_unsupported)
 680                        sei->ntsm = ntsm;
 681
 682                if (chsc(sei))
 683                        break;
 684
 685                if (sei->response.code != 0x0001) {
 686                        CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
 687                                      sei->response.code, sei->ntsm);
 688
 689                        if (sei->response.code == 3 && sei->ntsm) {
 690                                /* Fallback for old firmware. */
 691                                ntsm_unsupported = 1;
 692                                continue;
 693                        }
 694                        break;
 695                }
 696
 697                CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 698                switch (sei->nt) {
 699                case 0:
 700                        chsc_process_sei_nt0(&sei->u.nt0_area);
 701                        break;
 702                case 2:
 703                        chsc_process_sei_nt2(&sei->u.nt2_area);
 704                        break;
 705                default:
 706                        CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 707                        break;
 708                }
 709
 710                if (!(sei->u.nt0_area.flags & 0x80))
 711                        break;
 712        }
 713}
 714
 715/*
 716 * Handle channel subsystem related CRWs.
 717 * Use store event information to find out what's going on.
 718 *
 719 * Note: Access to sei_page is serialized through machine check handler
 720 * thread, so no need for locking.
 721 */
 722static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 723{
 724        struct chsc_sei *sei = sei_page;
 725
 726        if (overflow) {
 727                css_schedule_eval_all();
 728                return;
 729        }
 730        CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 731                      "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 732                      crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 733                      crw0->erc, crw0->rsid);
 734
 735        CIO_TRACE_EVENT(2, "prcss");
 736        chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 737}
 738
 739void chsc_chp_online(struct chp_id chpid)
 740{
 741        struct channel_path *chp = chpid_to_chp(chpid);
 742        struct chp_link link;
 743        char dbf_txt[15];
 744
 745        sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 746        CIO_TRACE_EVENT(2, dbf_txt);
 747
 748        if (chp_get_status(chpid) != 0) {
 749                memset(&link, 0, sizeof(struct chp_link));
 750                link.chpid = chpid;
 751                /* Wait until previous actions have settled. */
 752                css_wait_for_slow_path();
 753
 754                mutex_lock(&chp->lock);
 755                chp_update_desc(chp);
 756                mutex_unlock(&chp->lock);
 757
 758                for_each_subchannel_staged(__s390_process_res_acc, NULL,
 759                                           &link);
 760                css_schedule_reprobe();
 761        }
 762}
 763
 764static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 765                                         struct chp_id chpid, int on)
 766{
 767        unsigned long flags;
 768        struct chp_link link;
 769
 770        memset(&link, 0, sizeof(struct chp_link));
 771        link.chpid = chpid;
 772        spin_lock_irqsave(sch->lock, flags);
 773        if (sch->driver && sch->driver->chp_event)
 774                sch->driver->chp_event(sch, &link,
 775                                       on ? CHP_VARY_ON : CHP_VARY_OFF);
 776        spin_unlock_irqrestore(sch->lock, flags);
 777}
 778
 779static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 780{
 781        struct chp_id *chpid = data;
 782
 783        __s390_subchannel_vary_chpid(sch, *chpid, 0);
 784        return 0;
 785}
 786
 787static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 788{
 789        struct chp_id *chpid = data;
 790
 791        __s390_subchannel_vary_chpid(sch, *chpid, 1);
 792        return 0;
 793}
 794
 795/**
 796 * chsc_chp_vary - propagate channel-path vary operation to subchannels
 797 * @chpid: channl-path ID
 798 * @on: non-zero for vary online, zero for vary offline
 799 */
 800int chsc_chp_vary(struct chp_id chpid, int on)
 801{
 802        struct channel_path *chp = chpid_to_chp(chpid);
 803
 804        /*
 805         * Redo PathVerification on the devices the chpid connects to
 806         */
 807        if (on) {
 808                /* Try to update the channel path description. */
 809                chp_update_desc(chp);
 810                for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 811                                           NULL, &chpid);
 812                css_schedule_reprobe();
 813        } else
 814                for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 815                                           NULL, &chpid);
 816
 817        return 0;
 818}
 819
 820static void
 821chsc_remove_cmg_attr(struct channel_subsystem *css)
 822{
 823        int i;
 824
 825        for (i = 0; i <= __MAX_CHPID; i++) {
 826                if (!css->chps[i])
 827                        continue;
 828                chp_remove_cmg_attr(css->chps[i]);
 829        }
 830}
 831
 832static int
 833chsc_add_cmg_attr(struct channel_subsystem *css)
 834{
 835        int i, ret;
 836
 837        ret = 0;
 838        for (i = 0; i <= __MAX_CHPID; i++) {
 839                if (!css->chps[i])
 840                        continue;
 841                ret = chp_add_cmg_attr(css->chps[i]);
 842                if (ret)
 843                        goto cleanup;
 844        }
 845        return ret;
 846cleanup:
 847        for (--i; i >= 0; i--) {
 848                if (!css->chps[i])
 849                        continue;
 850                chp_remove_cmg_attr(css->chps[i]);
 851        }
 852        return ret;
 853}
 854
 855int __chsc_do_secm(struct channel_subsystem *css, int enable)
 856{
 857        struct {
 858                struct chsc_header request;
 859                u32 operation_code : 2;
 860                u32 : 30;
 861                u32 key : 4;
 862                u32 : 28;
 863                u32 zeroes1;
 864                u32 cub_addr1;
 865                u32 zeroes2;
 866                u32 cub_addr2;
 867                u32 reserved[13];
 868                struct chsc_header response;
 869                u32 status : 8;
 870                u32 : 4;
 871                u32 fmt : 4;
 872                u32 : 16;
 873        } *secm_area;
 874        unsigned long flags;
 875        int ret, ccode;
 876
 877        spin_lock_irqsave(&chsc_page_lock, flags);
 878        memset(chsc_page, 0, PAGE_SIZE);
 879        secm_area = chsc_page;
 880        secm_area->request.length = 0x0050;
 881        secm_area->request.code = 0x0016;
 882
 883        secm_area->key = PAGE_DEFAULT_KEY >> 4;
 884        secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 885        secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 886
 887        secm_area->operation_code = enable ? 0 : 1;
 888
 889        ccode = chsc(secm_area);
 890        if (ccode > 0) {
 891                ret = (ccode == 3) ? -ENODEV : -EBUSY;
 892                goto out;
 893        }
 894
 895        switch (secm_area->response.code) {
 896        case 0x0102:
 897        case 0x0103:
 898                ret = -EINVAL;
 899                break;
 900        default:
 901                ret = chsc_error_from_response(secm_area->response.code);
 902        }
 903        if (ret != 0)
 904                CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 905                              secm_area->response.code);
 906out:
 907        spin_unlock_irqrestore(&chsc_page_lock, flags);
 908        return ret;
 909}
 910
 911int
 912chsc_secm(struct channel_subsystem *css, int enable)
 913{
 914        int ret;
 915
 916        if (enable && !css->cm_enabled) {
 917                css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 918                css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 919                if (!css->cub_addr1 || !css->cub_addr2) {
 920                        free_page((unsigned long)css->cub_addr1);
 921                        free_page((unsigned long)css->cub_addr2);
 922                        return -ENOMEM;
 923                }
 924        }
 925        ret = __chsc_do_secm(css, enable);
 926        if (!ret) {
 927                css->cm_enabled = enable;
 928                if (css->cm_enabled) {
 929                        ret = chsc_add_cmg_attr(css);
 930                        if (ret) {
 931                                __chsc_do_secm(css, 0);
 932                                css->cm_enabled = 0;
 933                        }
 934                } else
 935                        chsc_remove_cmg_attr(css);
 936        }
 937        if (!css->cm_enabled) {
 938                free_page((unsigned long)css->cub_addr1);
 939                free_page((unsigned long)css->cub_addr2);
 940        }
 941        return ret;
 942}
 943
 944int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 945                                     int c, int m, void *page)
 946{
 947        struct chsc_scpd *scpd_area;
 948        int ccode, ret;
 949
 950        if ((rfmt == 1 || rfmt == 0) && c == 1 &&
 951            !css_general_characteristics.fcs)
 952                return -EINVAL;
 953        if ((rfmt == 2) && !css_general_characteristics.cib)
 954                return -EINVAL;
 955        if ((rfmt == 3) && !css_general_characteristics.util_str)
 956                return -EINVAL;
 957
 958        memset(page, 0, PAGE_SIZE);
 959        scpd_area = page;
 960        scpd_area->request.length = 0x0010;
 961        scpd_area->request.code = 0x0002;
 962        scpd_area->cssid = chpid.cssid;
 963        scpd_area->first_chpid = chpid.id;
 964        scpd_area->last_chpid = chpid.id;
 965        scpd_area->m = m;
 966        scpd_area->c = c;
 967        scpd_area->fmt = fmt;
 968        scpd_area->rfmt = rfmt;
 969
 970        ccode = chsc(scpd_area);
 971        if (ccode > 0)
 972                return (ccode == 3) ? -ENODEV : -EBUSY;
 973
 974        ret = chsc_error_from_response(scpd_area->response.code);
 975        if (ret)
 976                CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 977                              scpd_area->response.code);
 978        return ret;
 979}
 980EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 981
 982#define chsc_det_chp_desc(FMT, c)                                       \
 983int chsc_determine_fmt##FMT##_channel_path_desc(                        \
 984        struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc)   \
 985{                                                                       \
 986        struct chsc_scpd *scpd_area;                                    \
 987        unsigned long flags;                                            \
 988        int ret;                                                        \
 989                                                                        \
 990        spin_lock_irqsave(&chsc_page_lock, flags);                      \
 991        scpd_area = chsc_page;                                          \
 992        ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0,     \
 993                                               scpd_area);              \
 994        if (ret)                                                        \
 995                goto out;                                               \
 996                                                                        \
 997        memcpy(desc, scpd_area->data, sizeof(*desc));                   \
 998out:                                                                    \
 999        spin_unlock_irqrestore(&chsc_page_lock, flags);                 \
1000        return ret;                                                     \
1001}
1002
1003chsc_det_chp_desc(0, 0)
1004chsc_det_chp_desc(1, 1)
1005chsc_det_chp_desc(3, 0)
1006
1007static void
1008chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
1009                          struct cmg_chars *chars)
1010{
1011        int i, mask;
1012
1013        for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
1014                mask = 0x80 >> (i + 3);
1015                if (cmcv & mask)
1016                        chp->cmg_chars.values[i] = chars->values[i];
1017                else
1018                        chp->cmg_chars.values[i] = 0;
1019        }
1020}
1021
1022int chsc_get_channel_measurement_chars(struct channel_path *chp)
1023{
1024        unsigned long flags;
1025        int ccode, ret;
1026
1027        struct {
1028                struct chsc_header request;
1029                u32 : 24;
1030                u32 first_chpid : 8;
1031                u32 : 24;
1032                u32 last_chpid : 8;
1033                u32 zeroes1;
1034                struct chsc_header response;
1035                u32 zeroes2;
1036                u32 not_valid : 1;
1037                u32 shared : 1;
1038                u32 : 22;
1039                u32 chpid : 8;
1040                u32 cmcv : 5;
1041                u32 : 11;
1042                u32 cmgq : 8;
1043                u32 cmg : 8;
1044                u32 zeroes3;
1045                u32 data[NR_MEASUREMENT_CHARS];
1046        } *scmc_area;
1047
1048        chp->shared = -1;
1049        chp->cmg = -1;
1050
1051        if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1052                return -EINVAL;
1053
1054        spin_lock_irqsave(&chsc_page_lock, flags);
1055        memset(chsc_page, 0, PAGE_SIZE);
1056        scmc_area = chsc_page;
1057        scmc_area->request.length = 0x0010;
1058        scmc_area->request.code = 0x0022;
1059        scmc_area->first_chpid = chp->chpid.id;
1060        scmc_area->last_chpid = chp->chpid.id;
1061
1062        ccode = chsc(scmc_area);
1063        if (ccode > 0) {
1064                ret = (ccode == 3) ? -ENODEV : -EBUSY;
1065                goto out;
1066        }
1067
1068        ret = chsc_error_from_response(scmc_area->response.code);
1069        if (ret) {
1070                CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1071                              scmc_area->response.code);
1072                goto out;
1073        }
1074        if (scmc_area->not_valid)
1075                goto out;
1076
1077        chp->cmg = scmc_area->cmg;
1078        chp->shared = scmc_area->shared;
1079        if (chp->cmg != 2 && chp->cmg != 3) {
1080                /* No cmg-dependent data. */
1081                goto out;
1082        }
1083        chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1084                                  (struct cmg_chars *) &scmc_area->data);
1085out:
1086        spin_unlock_irqrestore(&chsc_page_lock, flags);
1087        return ret;
1088}
1089
1090int __init chsc_init(void)
1091{
1092        int ret;
1093
1094        sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1095        chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1096        if (!sei_page || !chsc_page) {
1097                ret = -ENOMEM;
1098                goto out_err;
1099        }
1100        ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1101        if (ret)
1102                goto out_err;
1103        return ret;
1104out_err:
1105        free_page((unsigned long)chsc_page);
1106        free_page((unsigned long)sei_page);
1107        return ret;
1108}
1109
1110void __init chsc_init_cleanup(void)
1111{
1112        crw_unregister_handler(CRW_RSC_CSS);
1113        free_page((unsigned long)chsc_page);
1114        free_page((unsigned long)sei_page);
1115}
1116
1117int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1118{
1119        int ret;
1120
1121        sda_area->request.length = 0x0400;
1122        sda_area->request.code = 0x0031;
1123        sda_area->operation_code = operation_code;
1124
1125        ret = chsc(sda_area);
1126        if (ret > 0) {
1127                ret = (ret == 3) ? -ENODEV : -EBUSY;
1128                goto out;
1129        }
1130
1131        switch (sda_area->response.code) {
1132        case 0x0101:
1133                ret = -EOPNOTSUPP;
1134                break;
1135        default:
1136                ret = chsc_error_from_response(sda_area->response.code);
1137        }
1138out:
1139        return ret;
1140}
1141
1142int chsc_enable_facility(int operation_code)
1143{
1144        struct chsc_sda_area *sda_area;
1145        unsigned long flags;
1146        int ret;
1147
1148        spin_lock_irqsave(&chsc_page_lock, flags);
1149        memset(chsc_page, 0, PAGE_SIZE);
1150        sda_area = chsc_page;
1151
1152        ret = __chsc_enable_facility(sda_area, operation_code);
1153        if (ret != 0)
1154                CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1155                              operation_code, sda_area->response.code);
1156
1157        spin_unlock_irqrestore(&chsc_page_lock, flags);
1158        return ret;
1159}
1160
1161int __init chsc_get_cssid_iid(int idx, u8 *cssid, u8 *iid)
1162{
1163        struct {
1164                struct chsc_header request;
1165                u8 atype;
1166                u32 : 24;
1167                u32 reserved1[6];
1168                struct chsc_header response;
1169                u32 reserved2[3];
1170                struct {
1171                        u8 cssid;
1172                        u8 iid;
1173                        u32 : 16;
1174                } list[0];
1175        } *sdcal_area;
1176        int ret;
1177
1178        spin_lock_irq(&chsc_page_lock);
1179        memset(chsc_page, 0, PAGE_SIZE);
1180        sdcal_area = chsc_page;
1181        sdcal_area->request.length = 0x0020;
1182        sdcal_area->request.code = 0x0034;
1183        sdcal_area->atype = 4;
1184
1185        ret = chsc(sdcal_area);
1186        if (ret) {
1187                ret = (ret == 3) ? -ENODEV : -EBUSY;
1188                goto exit;
1189        }
1190
1191        ret = chsc_error_from_response(sdcal_area->response.code);
1192        if (ret) {
1193                CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
1194                              sdcal_area->response.code);
1195                goto exit;
1196        }
1197
1198        if ((addr_t) &sdcal_area->list[idx] <
1199            (addr_t) &sdcal_area->response + sdcal_area->response.length) {
1200                *cssid = sdcal_area->list[idx].cssid;
1201                *iid = sdcal_area->list[idx].iid;
1202        }
1203        else
1204                ret = -ENODEV;
1205exit:
1206        spin_unlock_irq(&chsc_page_lock);
1207        return ret;
1208}
1209
1210struct css_general_char css_general_characteristics;
1211struct css_chsc_char css_chsc_characteristics;
1212
1213int __init
1214chsc_determine_css_characteristics(void)
1215{
1216        unsigned long flags;
1217        int result;
1218        struct {
1219                struct chsc_header request;
1220                u32 reserved1;
1221                u32 reserved2;
1222                u32 reserved3;
1223                struct chsc_header response;
1224                u32 reserved4;
1225                u32 general_char[510];
1226                u32 chsc_char[508];
1227        } *scsc_area;
1228
1229        spin_lock_irqsave(&chsc_page_lock, flags);
1230        memset(chsc_page, 0, PAGE_SIZE);
1231        scsc_area = chsc_page;
1232        scsc_area->request.length = 0x0010;
1233        scsc_area->request.code = 0x0010;
1234
1235        result = chsc(scsc_area);
1236        if (result) {
1237                result = (result == 3) ? -ENODEV : -EBUSY;
1238                goto exit;
1239        }
1240
1241        result = chsc_error_from_response(scsc_area->response.code);
1242        if (result == 0) {
1243                memcpy(&css_general_characteristics, scsc_area->general_char,
1244                       sizeof(css_general_characteristics));
1245                memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1246                       sizeof(css_chsc_characteristics));
1247        } else
1248                CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1249                              scsc_area->response.code);
1250exit:
1251        spin_unlock_irqrestore(&chsc_page_lock, flags);
1252        return result;
1253}
1254
1255EXPORT_SYMBOL_GPL(css_general_characteristics);
1256EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1257
1258int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta)
1259{
1260        struct {
1261                struct chsc_header request;
1262                unsigned int rsvd0;
1263                unsigned int op : 8;
1264                unsigned int rsvd1 : 8;
1265                unsigned int ctrl : 16;
1266                unsigned int rsvd2[5];
1267                struct chsc_header response;
1268                unsigned int rsvd3[3];
1269                u64 clock_delta;
1270                unsigned int rsvd4[2];
1271        } *rr;
1272        int rc;
1273
1274        memset(page, 0, PAGE_SIZE);
1275        rr = page;
1276        rr->request.length = 0x0020;
1277        rr->request.code = 0x0033;
1278        rr->op = op;
1279        rr->ctrl = ctrl;
1280        rc = chsc(rr);
1281        if (rc)
1282                return -EIO;
1283        rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1284        if (clock_delta)
1285                *clock_delta = rr->clock_delta;
1286        return rc;
1287}
1288
1289int chsc_sstpi(void *page, void *result, size_t size)
1290{
1291        struct {
1292                struct chsc_header request;
1293                unsigned int rsvd0[3];
1294                struct chsc_header response;
1295                char data[];
1296        } *rr;
1297        int rc;
1298
1299        memset(page, 0, PAGE_SIZE);
1300        rr = page;
1301        rr->request.length = 0x0010;
1302        rr->request.code = 0x0038;
1303        rc = chsc(rr);
1304        if (rc)
1305                return -EIO;
1306        memcpy(result, &rr->data, size);
1307        return (rr->response.code == 0x0001) ? 0 : -EIO;
1308}
1309
1310int chsc_stzi(void *page, void *result, size_t size)
1311{
1312        struct {
1313                struct chsc_header request;
1314                unsigned int rsvd0[3];
1315                struct chsc_header response;
1316                char data[];
1317        } *rr;
1318        int rc;
1319
1320        memset(page, 0, PAGE_SIZE);
1321        rr = page;
1322        rr->request.length = 0x0010;
1323        rr->request.code = 0x003e;
1324        rc = chsc(rr);
1325        if (rc)
1326                return -EIO;
1327        memcpy(result, &rr->data, size);
1328        return (rr->response.code == 0x0001) ? 0 : -EIO;
1329}
1330
1331int chsc_siosl(struct subchannel_id schid)
1332{
1333        struct {
1334                struct chsc_header request;
1335                u32 word1;
1336                struct subchannel_id sid;
1337                u32 word3;
1338                struct chsc_header response;
1339                u32 word[11];
1340        } *siosl_area;
1341        unsigned long flags;
1342        int ccode;
1343        int rc;
1344
1345        spin_lock_irqsave(&chsc_page_lock, flags);
1346        memset(chsc_page, 0, PAGE_SIZE);
1347        siosl_area = chsc_page;
1348        siosl_area->request.length = 0x0010;
1349        siosl_area->request.code = 0x0046;
1350        siosl_area->word1 = 0x80000000;
1351        siosl_area->sid = schid;
1352
1353        ccode = chsc(siosl_area);
1354        if (ccode > 0) {
1355                if (ccode == 3)
1356                        rc = -ENODEV;
1357                else
1358                        rc = -EBUSY;
1359                CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1360                              schid.ssid, schid.sch_no, ccode);
1361                goto out;
1362        }
1363        rc = chsc_error_from_response(siosl_area->response.code);
1364        if (rc)
1365                CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1366                              schid.ssid, schid.sch_no,
1367                              siosl_area->response.code);
1368        else
1369                CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1370                              schid.ssid, schid.sch_no);
1371out:
1372        spin_unlock_irqrestore(&chsc_page_lock, flags);
1373        return rc;
1374}
1375EXPORT_SYMBOL_GPL(chsc_siosl);
1376
1377/**
1378 * chsc_scm_info() - store SCM information (SSI)
1379 * @scm_area: request and response block for SSI
1380 * @token: continuation token
1381 *
1382 * Returns 0 on success.
1383 */
1384int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1385{
1386        int ccode, ret;
1387
1388        memset(scm_area, 0, sizeof(*scm_area));
1389        scm_area->request.length = 0x0020;
1390        scm_area->request.code = 0x004C;
1391        scm_area->reqtok = token;
1392
1393        ccode = chsc(scm_area);
1394        if (ccode > 0) {
1395                ret = (ccode == 3) ? -ENODEV : -EBUSY;
1396                goto out;
1397        }
1398        ret = chsc_error_from_response(scm_area->response.code);
1399        if (ret != 0)
1400                CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1401                              scm_area->response.code);
1402out:
1403        return ret;
1404}
1405EXPORT_SYMBOL_GPL(chsc_scm_info);
1406
1407/**
1408 * chsc_pnso() - Perform Network-Subchannel Operation
1409 * @schid:              id of the subchannel on which PNSO is performed
1410 * @pnso_area:          request and response block for the operation
1411 * @oc:                 Operation Code
1412 * @resume_token:       resume token for multiblock response
1413 * @cnc:                Boolean change-notification control
1414 *
1415 * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1416 *
1417 * Returns 0 on success.
1418 */
1419int chsc_pnso(struct subchannel_id schid, struct chsc_pnso_area *pnso_area,
1420              u8 oc, struct chsc_pnso_resume_token resume_token, int cnc)
1421{
1422        memset(pnso_area, 0, sizeof(*pnso_area));
1423        pnso_area->request.length = 0x0030;
1424        pnso_area->request.code = 0x003d; /* network-subchannel operation */
1425        pnso_area->m       = schid.m;
1426        pnso_area->ssid  = schid.ssid;
1427        pnso_area->sch   = schid.sch_no;
1428        pnso_area->cssid = schid.cssid;
1429        pnso_area->oc    = oc;
1430        pnso_area->resume_token = resume_token;
1431        pnso_area->n       = (cnc != 0);
1432        if (chsc(pnso_area))
1433                return -EIO;
1434        return chsc_error_from_response(pnso_area->response.code);
1435}
1436
1437int chsc_sgib(u32 origin)
1438{
1439        struct {
1440                struct chsc_header request;
1441                u16 op;
1442                u8  reserved01[2];
1443                u8  reserved02:4;
1444                u8  fmt:4;
1445                u8  reserved03[7];
1446                /* operation data area begin */
1447                u8  reserved04[4];
1448                u32 gib_origin;
1449                u8  reserved05[10];
1450                u8  aix;
1451                u8  reserved06[4029];
1452                struct chsc_header response;
1453                u8  reserved07[4];
1454        } *sgib_area;
1455        int ret;
1456
1457        spin_lock_irq(&chsc_page_lock);
1458        memset(chsc_page, 0, PAGE_SIZE);
1459        sgib_area = chsc_page;
1460        sgib_area->request.length = 0x0fe0;
1461        sgib_area->request.code = 0x0021;
1462        sgib_area->op = 0x1;
1463        sgib_area->gib_origin = origin;
1464
1465        ret = chsc(sgib_area);
1466        if (ret == 0)
1467                ret = chsc_error_from_response(sgib_area->response.code);
1468        spin_unlock_irq(&chsc_page_lock);
1469
1470        return ret;
1471}
1472EXPORT_SYMBOL_GPL(chsc_sgib);
1473
1474#define SCUD_REQ_LEN    0x10 /* SCUD request block length */
1475#define SCUD_REQ_CMD    0x4b /* SCUD Command Code */
1476
1477struct chse_cudb {
1478        u16 flags:8;
1479        u16 chp_valid:8;
1480        u16 cu;
1481        u32 esm_valid:8;
1482        u32:24;
1483        u8 chpid[8];
1484        u32:32;
1485        u32:32;
1486        u8 esm[8];
1487        u32 efla[8];
1488} __packed;
1489
1490struct chsc_scud {
1491        struct chsc_header request;
1492        u16:4;
1493        u16 fmt:4;
1494        u16 cssid:8;
1495        u16 first_cu;
1496        u16:16;
1497        u16 last_cu;
1498        u32:32;
1499        struct chsc_header response;
1500        u16:4;
1501        u16 fmt_resp:4;
1502        u32:24;
1503        struct chse_cudb cudb[];
1504} __packed;
1505
1506/**
1507 * chsc_scud() - Store control-unit description.
1508 * @cu:         number of the control-unit
1509 * @esm:        8 1-byte endpoint security mode values
1510 * @esm_valid:  validity mask for @esm
1511 *
1512 * Interface to retrieve information about the endpoint security
1513 * modes for up to 8 paths of a control unit.
1514 *
1515 * Returns 0 on success.
1516 */
1517int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid)
1518{
1519        struct chsc_scud *scud = chsc_page;
1520        int ret;
1521
1522        spin_lock_irq(&chsc_page_lock);
1523        memset(chsc_page, 0, PAGE_SIZE);
1524        scud->request.length = SCUD_REQ_LEN;
1525        scud->request.code = SCUD_REQ_CMD;
1526        scud->fmt = 0;
1527        scud->cssid = 0;
1528        scud->first_cu = cu;
1529        scud->last_cu = cu;
1530
1531        ret = chsc(scud);
1532        if (!ret)
1533                ret = chsc_error_from_response(scud->response.code);
1534
1535        if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0
1536                        || !(scud->cudb[0].flags & 0x80)
1537                        || scud->cudb[0].cu != cu)) {
1538
1539                CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x "
1540                        "FMT=%04x, cudb.flags=%02x, cudb.cu=%04x",
1541                        scud->response.code, scud->response.length,
1542                        scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu);
1543                ret = -EINVAL;
1544        }
1545
1546        if (ret)
1547                goto out;
1548
1549        memcpy(esm, scud->cudb[0].esm, sizeof(*esm));
1550        *esm_valid = scud->cudb[0].esm_valid;
1551out:
1552        spin_unlock_irq(&chsc_page_lock);
1553        return ret;
1554}
1555EXPORT_SYMBOL_GPL(chsc_scud);
1556
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