linux/drivers/s390/block/dasd_fba.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4 * Bugreports.to..: <Linux390@de.ibm.com>
   5 * Copyright IBM Corp. 1999, 2009
   6 */
   7
   8#define KMSG_COMPONENT "dasd-fba"
   9
  10#include <linux/stddef.h>
  11#include <linux/kernel.h>
  12#include <asm/debug.h>
  13
  14#include <linux/slab.h>
  15#include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  16#include <linux/bio.h>
  17#include <linux/module.h>
  18#include <linux/init.h>
  19
  20#include <asm/idals.h>
  21#include <asm/ebcdic.h>
  22#include <asm/io.h>
  23#include <asm/ccwdev.h>
  24
  25#include "dasd_int.h"
  26#include "dasd_fba.h"
  27
  28#ifdef PRINTK_HEADER
  29#undef PRINTK_HEADER
  30#endif                          /* PRINTK_HEADER */
  31#define PRINTK_HEADER "dasd(fba):"
  32
  33#define FBA_DEFAULT_RETRIES 32
  34
  35#define DASD_FBA_CCW_WRITE 0x41
  36#define DASD_FBA_CCW_READ 0x42
  37#define DASD_FBA_CCW_LOCATE 0x43
  38#define DASD_FBA_CCW_DEFINE_EXTENT 0x63
  39
  40MODULE_LICENSE("GPL");
  41
  42static struct dasd_discipline dasd_fba_discipline;
  43static void *dasd_fba_zero_page;
  44
  45struct dasd_fba_private {
  46        struct dasd_fba_characteristics rdc_data;
  47};
  48
  49static struct ccw_device_id dasd_fba_ids[] = {
  50        { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
  51        { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
  52        { /* end of list */ },
  53};
  54
  55MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
  56
  57static int
  58dasd_fba_set_online(struct ccw_device *cdev)
  59{
  60        return dasd_generic_set_online(cdev, &dasd_fba_discipline);
  61}
  62
  63static struct ccw_driver dasd_fba_driver = {
  64        .driver = {
  65                .name   = "dasd-fba",
  66                .owner  = THIS_MODULE,
  67                .dev_groups = dasd_dev_groups,
  68        },
  69        .ids         = dasd_fba_ids,
  70        .probe       = dasd_generic_probe,
  71        .remove      = dasd_generic_remove,
  72        .set_offline = dasd_generic_set_offline,
  73        .set_online  = dasd_fba_set_online,
  74        .notify      = dasd_generic_notify,
  75        .path_event  = dasd_generic_path_event,
  76        .int_class   = IRQIO_DAS,
  77};
  78
  79static void
  80define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
  81              int blksize, int beg, int nr)
  82{
  83        ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
  84        ccw->flags = 0;
  85        ccw->count = 16;
  86        ccw->cda = (__u32) __pa(data);
  87        memset(data, 0, sizeof (struct DE_fba_data));
  88        if (rw == WRITE)
  89                (data->mask).perm = 0x0;
  90        else if (rw == READ)
  91                (data->mask).perm = 0x1;
  92        else
  93                data->mask.perm = 0x2;
  94        data->blk_size = blksize;
  95        data->ext_loc = beg;
  96        data->ext_end = nr - 1;
  97}
  98
  99static void
 100locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
 101              int block_nr, int block_ct)
 102{
 103        ccw->cmd_code = DASD_FBA_CCW_LOCATE;
 104        ccw->flags = 0;
 105        ccw->count = 8;
 106        ccw->cda = (__u32) __pa(data);
 107        memset(data, 0, sizeof (struct LO_fba_data));
 108        if (rw == WRITE)
 109                data->operation.cmd = 0x5;
 110        else if (rw == READ)
 111                data->operation.cmd = 0x6;
 112        else
 113                data->operation.cmd = 0x8;
 114        data->blk_nr = block_nr;
 115        data->blk_ct = block_ct;
 116}
 117
 118static int
 119dasd_fba_check_characteristics(struct dasd_device *device)
 120{
 121        struct dasd_fba_private *private = device->private;
 122        struct ccw_device *cdev = device->cdev;
 123        struct dasd_block *block;
 124        int readonly, rc;
 125
 126        if (!private) {
 127                private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
 128                if (!private) {
 129                        dev_warn(&device->cdev->dev,
 130                                 "Allocating memory for private DASD "
 131                                 "data failed\n");
 132                        return -ENOMEM;
 133                }
 134                device->private = private;
 135        } else {
 136                memset(private, 0, sizeof(*private));
 137        }
 138        block = dasd_alloc_block();
 139        if (IS_ERR(block)) {
 140                DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
 141                                "dasd block structure");
 142                device->private = NULL;
 143                kfree(private);
 144                return PTR_ERR(block);
 145        }
 146        device->block = block;
 147        block->base = device;
 148
 149        /* Read Device Characteristics */
 150        rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
 151                                         &private->rdc_data, 32);
 152        if (rc) {
 153                DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
 154                                "characteristics returned error %d", rc);
 155                device->block = NULL;
 156                dasd_free_block(block);
 157                device->private = NULL;
 158                kfree(private);
 159                return rc;
 160        }
 161
 162        device->default_expires = DASD_EXPIRES;
 163        device->default_retries = FBA_DEFAULT_RETRIES;
 164        dasd_path_set_opm(device, LPM_ANYPATH);
 165
 166        readonly = dasd_device_is_ro(device);
 167        if (readonly)
 168                set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 169
 170        /* FBA supports discard, set the according feature bit */
 171        dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);
 172
 173        dev_info(&device->cdev->dev,
 174                 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
 175                 "and %d B/blk%s\n",
 176                 cdev->id.dev_type,
 177                 cdev->id.dev_model,
 178                 cdev->id.cu_type,
 179                 cdev->id.cu_model,
 180                 ((private->rdc_data.blk_bdsa *
 181                   (private->rdc_data.blk_size >> 9)) >> 11),
 182                 private->rdc_data.blk_size,
 183                 readonly ? ", read-only device" : "");
 184        return 0;
 185}
 186
 187static int dasd_fba_do_analysis(struct dasd_block *block)
 188{
 189        struct dasd_fba_private *private = block->base->private;
 190        int sb, rc;
 191
 192        rc = dasd_check_blocksize(private->rdc_data.blk_size);
 193        if (rc) {
 194                DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
 195                            private->rdc_data.blk_size);
 196                return rc;
 197        }
 198        block->blocks = private->rdc_data.blk_bdsa;
 199        block->bp_block = private->rdc_data.blk_size;
 200        block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 201        for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
 202                block->s2b_shift++;
 203        return 0;
 204}
 205
 206static int dasd_fba_fill_geometry(struct dasd_block *block,
 207                                  struct hd_geometry *geo)
 208{
 209        if (dasd_check_blocksize(block->bp_block) != 0)
 210                return -EINVAL;
 211        geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 212        geo->heads = 16;
 213        geo->sectors = 128 >> block->s2b_shift;
 214        return 0;
 215}
 216
 217static dasd_erp_fn_t
 218dasd_fba_erp_action(struct dasd_ccw_req * cqr)
 219{
 220        return dasd_default_erp_action;
 221}
 222
 223static dasd_erp_fn_t
 224dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
 225{
 226        if (cqr->function == dasd_default_erp_action)
 227                return dasd_default_erp_postaction;
 228
 229        DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
 230                    cqr->function);
 231        return NULL;
 232}
 233
 234static void dasd_fba_check_for_device_change(struct dasd_device *device,
 235                                             struct dasd_ccw_req *cqr,
 236                                             struct irb *irb)
 237{
 238        char mask;
 239
 240        /* first of all check for state change pending interrupt */
 241        mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
 242        if ((irb->scsw.cmd.dstat & mask) == mask)
 243                dasd_generic_handle_state_change(device);
 244};
 245
 246
 247/*
 248 * Builds a CCW with no data payload
 249 */
 250static void ccw_write_no_data(struct ccw1 *ccw)
 251{
 252        ccw->cmd_code = DASD_FBA_CCW_WRITE;
 253        ccw->flags |= CCW_FLAG_SLI;
 254        ccw->count = 0;
 255}
 256
 257/*
 258 * Builds a CCW that writes only zeroes.
 259 */
 260static void ccw_write_zero(struct ccw1 *ccw, int count)
 261{
 262        ccw->cmd_code = DASD_FBA_CCW_WRITE;
 263        ccw->flags |= CCW_FLAG_SLI;
 264        ccw->count = count;
 265        ccw->cda = (__u32) (addr_t) dasd_fba_zero_page;
 266}
 267
 268/*
 269 * Helper function to count the amount of necessary CCWs within a given range
 270 * with 4k alignment and command chaining in mind.
 271 */
 272static int count_ccws(sector_t first_rec, sector_t last_rec,
 273                      unsigned int blocks_per_page)
 274{
 275        sector_t wz_stop = 0, d_stop = 0;
 276        int cur_pos = 0;
 277        int count = 0;
 278
 279        if (first_rec % blocks_per_page != 0) {
 280                wz_stop = first_rec + blocks_per_page -
 281                        (first_rec % blocks_per_page) - 1;
 282                if (wz_stop > last_rec)
 283                        wz_stop = last_rec;
 284                cur_pos = wz_stop - first_rec + 1;
 285                count++;
 286        }
 287
 288        if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
 289                if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
 290                        d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
 291                                             blocks_per_page);
 292                else
 293                        d_stop = last_rec;
 294
 295                cur_pos += d_stop - (first_rec + cur_pos) + 1;
 296                count++;
 297        }
 298
 299        if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec)
 300                count++;
 301
 302        return count;
 303}
 304
 305/*
 306 * This function builds a CCW request for block layer discard requests.
 307 * Each page in the z/VM hypervisor that represents certain records of an FBA
 308 * device will be padded with zeros. This is a special behaviour of the WRITE
 309 * command which is triggered when no data payload is added to the CCW.
 310 *
 311 * Note: Due to issues in some z/VM versions, we can't fully utilise this
 312 * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to
 313 * work around those issues and write actual zeroes to the unaligned parts in
 314 * the request. This workaround might be removed in the future.
 315 */
 316static struct dasd_ccw_req *dasd_fba_build_cp_discard(
 317                                                struct dasd_device *memdev,
 318                                                struct dasd_block *block,
 319                                                struct request *req)
 320{
 321        struct LO_fba_data *LO_data;
 322        struct dasd_ccw_req *cqr;
 323        struct ccw1 *ccw;
 324
 325        sector_t wz_stop = 0, d_stop = 0;
 326        sector_t first_rec, last_rec;
 327
 328        unsigned int blksize = block->bp_block;
 329        unsigned int blocks_per_page;
 330        int wz_count = 0;
 331        int d_count = 0;
 332        int cur_pos = 0; /* Current position within the extent */
 333        int count = 0;
 334        int cplength;
 335        int datasize;
 336        int nr_ccws;
 337
 338        first_rec = blk_rq_pos(req) >> block->s2b_shift;
 339        last_rec =
 340                (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 341        count = last_rec - first_rec + 1;
 342
 343        blocks_per_page = BLOCKS_PER_PAGE(blksize);
 344        nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page);
 345
 346        /* define extent + nr_ccws * locate record + nr_ccws * single CCW */
 347        cplength = 1 + 2 * nr_ccws;
 348        datasize = sizeof(struct DE_fba_data) +
 349                nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
 350
 351        cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
 352                                   blk_mq_rq_to_pdu(req));
 353        if (IS_ERR(cqr))
 354                return cqr;
 355
 356        ccw = cqr->cpaddr;
 357
 358        define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count);
 359        LO_data = cqr->data + sizeof(struct DE_fba_data);
 360
 361        /* First part is not aligned. Calculate range to write zeroes. */
 362        if (first_rec % blocks_per_page != 0) {
 363                wz_stop = first_rec + blocks_per_page -
 364                        (first_rec % blocks_per_page) - 1;
 365                if (wz_stop > last_rec)
 366                        wz_stop = last_rec;
 367                wz_count = wz_stop - first_rec + 1;
 368
 369                ccw[-1].flags |= CCW_FLAG_CC;
 370                locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
 371
 372                ccw[-1].flags |= CCW_FLAG_CC;
 373                ccw_write_zero(ccw++, wz_count * blksize);
 374
 375                cur_pos = wz_count;
 376        }
 377
 378        /* We can do proper discard when we've got at least blocks_per_page blocks. */
 379        if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
 380                /* is last record at page boundary? */
 381                if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
 382                        d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
 383                                             blocks_per_page);
 384                else
 385                        d_stop = last_rec;
 386
 387                d_count = d_stop - (first_rec + cur_pos) + 1;
 388
 389                ccw[-1].flags |= CCW_FLAG_CC;
 390                locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count);
 391
 392                ccw[-1].flags |= CCW_FLAG_CC;
 393                ccw_write_no_data(ccw++);
 394
 395                cur_pos += d_count;
 396        }
 397
 398        /* We might still have some bits left which need to be zeroed. */
 399        if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) {
 400                if (d_stop != 0)
 401                        wz_count = last_rec - d_stop;
 402                else if (wz_stop != 0)
 403                        wz_count = last_rec - wz_stop;
 404                else
 405                        wz_count = count;
 406
 407                ccw[-1].flags |= CCW_FLAG_CC;
 408                locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
 409
 410                ccw[-1].flags |= CCW_FLAG_CC;
 411                ccw_write_zero(ccw++, wz_count * blksize);
 412        }
 413
 414        if (blk_noretry_request(req) ||
 415            block->base->features & DASD_FEATURE_FAILFAST)
 416                set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 417
 418        cqr->startdev = memdev;
 419        cqr->memdev = memdev;
 420        cqr->block = block;
 421        cqr->expires = memdev->default_expires * HZ;    /* default 5 minutes */
 422        cqr->retries = memdev->default_retries;
 423        cqr->buildclk = get_tod_clock();
 424        cqr->status = DASD_CQR_FILLED;
 425
 426        return cqr;
 427}
 428
 429static struct dasd_ccw_req *dasd_fba_build_cp_regular(
 430                                                struct dasd_device *memdev,
 431                                                struct dasd_block *block,
 432                                                struct request *req)
 433{
 434        struct dasd_fba_private *private = block->base->private;
 435        unsigned long *idaws;
 436        struct LO_fba_data *LO_data;
 437        struct dasd_ccw_req *cqr;
 438        struct ccw1 *ccw;
 439        struct req_iterator iter;
 440        struct bio_vec bv;
 441        char *dst;
 442        int count, cidaw, cplength, datasize;
 443        sector_t recid, first_rec, last_rec;
 444        unsigned int blksize, off;
 445        unsigned char cmd;
 446
 447        if (rq_data_dir(req) == READ) {
 448                cmd = DASD_FBA_CCW_READ;
 449        } else if (rq_data_dir(req) == WRITE) {
 450                cmd = DASD_FBA_CCW_WRITE;
 451        } else
 452                return ERR_PTR(-EINVAL);
 453        blksize = block->bp_block;
 454        /* Calculate record id of first and last block. */
 455        first_rec = blk_rq_pos(req) >> block->s2b_shift;
 456        last_rec =
 457                (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 458        /* Check struct bio and count the number of blocks for the request. */
 459        count = 0;
 460        cidaw = 0;
 461        rq_for_each_segment(bv, req, iter) {
 462                if (bv.bv_len & (blksize - 1))
 463                        /* Fba can only do full blocks. */
 464                        return ERR_PTR(-EINVAL);
 465                count += bv.bv_len >> (block->s2b_shift + 9);
 466                if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
 467                        cidaw += bv.bv_len / blksize;
 468        }
 469        /* Paranoia. */
 470        if (count != last_rec - first_rec + 1)
 471                return ERR_PTR(-EINVAL);
 472        /* 1x define extent + 1x locate record + number of blocks */
 473        cplength = 2 + count;
 474        /* 1x define extent + 1x locate record */
 475        datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
 476                cidaw * sizeof(unsigned long);
 477        /*
 478         * Find out number of additional locate record ccws if the device
 479         * can't do data chaining.
 480         */
 481        if (private->rdc_data.mode.bits.data_chain == 0) {
 482                cplength += count - 1;
 483                datasize += (count - 1)*sizeof(struct LO_fba_data);
 484        }
 485        /* Allocate the ccw request. */
 486        cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
 487                                   blk_mq_rq_to_pdu(req));
 488        if (IS_ERR(cqr))
 489                return cqr;
 490        ccw = cqr->cpaddr;
 491        /* First ccw is define extent. */
 492        define_extent(ccw++, cqr->data, rq_data_dir(req),
 493                      block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
 494        /* Build locate_record + read/write ccws. */
 495        idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
 496        LO_data = (struct LO_fba_data *) (idaws + cidaw);
 497        /* Locate record for all blocks for smart devices. */
 498        if (private->rdc_data.mode.bits.data_chain != 0) {
 499                ccw[-1].flags |= CCW_FLAG_CC;
 500                locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
 501        }
 502        recid = first_rec;
 503        rq_for_each_segment(bv, req, iter) {
 504                dst = page_address(bv.bv_page) + bv.bv_offset;
 505                if (dasd_page_cache) {
 506                        char *copy = kmem_cache_alloc(dasd_page_cache,
 507                                                      GFP_DMA | __GFP_NOWARN);
 508                        if (copy && rq_data_dir(req) == WRITE)
 509                                memcpy(copy + bv.bv_offset, dst, bv.bv_len);
 510                        if (copy)
 511                                dst = copy + bv.bv_offset;
 512                }
 513                for (off = 0; off < bv.bv_len; off += blksize) {
 514                        /* Locate record for stupid devices. */
 515                        if (private->rdc_data.mode.bits.data_chain == 0) {
 516                                ccw[-1].flags |= CCW_FLAG_CC;
 517                                locate_record(ccw, LO_data++,
 518                                              rq_data_dir(req),
 519                                              recid - first_rec, 1);
 520                                ccw->flags = CCW_FLAG_CC;
 521                                ccw++;
 522                        } else {
 523                                if (recid > first_rec)
 524                                        ccw[-1].flags |= CCW_FLAG_DC;
 525                                else
 526                                        ccw[-1].flags |= CCW_FLAG_CC;
 527                        }
 528                        ccw->cmd_code = cmd;
 529                        ccw->count = block->bp_block;
 530                        if (idal_is_needed(dst, blksize)) {
 531                                ccw->cda = (__u32)(addr_t) idaws;
 532                                ccw->flags = CCW_FLAG_IDA;
 533                                idaws = idal_create_words(idaws, dst, blksize);
 534                        } else {
 535                                ccw->cda = (__u32)(addr_t) dst;
 536                                ccw->flags = 0;
 537                        }
 538                        ccw++;
 539                        dst += blksize;
 540                        recid++;
 541                }
 542        }
 543        if (blk_noretry_request(req) ||
 544            block->base->features & DASD_FEATURE_FAILFAST)
 545                set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 546        cqr->startdev = memdev;
 547        cqr->memdev = memdev;
 548        cqr->block = block;
 549        cqr->expires = memdev->default_expires * HZ;    /* default 5 minutes */
 550        cqr->retries = memdev->default_retries;
 551        cqr->buildclk = get_tod_clock();
 552        cqr->status = DASD_CQR_FILLED;
 553        return cqr;
 554}
 555
 556static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev,
 557                                              struct dasd_block *block,
 558                                              struct request *req)
 559{
 560        if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES)
 561                return dasd_fba_build_cp_discard(memdev, block, req);
 562        else
 563                return dasd_fba_build_cp_regular(memdev, block, req);
 564}
 565
 566static int
 567dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 568{
 569        struct dasd_fba_private *private = cqr->block->base->private;
 570        struct ccw1 *ccw;
 571        struct req_iterator iter;
 572        struct bio_vec bv;
 573        char *dst, *cda;
 574        unsigned int blksize, off;
 575        int status;
 576
 577        if (!dasd_page_cache)
 578                goto out;
 579        blksize = cqr->block->bp_block;
 580        ccw = cqr->cpaddr;
 581        /* Skip over define extent & locate record. */
 582        ccw++;
 583        if (private->rdc_data.mode.bits.data_chain != 0)
 584                ccw++;
 585        rq_for_each_segment(bv, req, iter) {
 586                dst = page_address(bv.bv_page) + bv.bv_offset;
 587                for (off = 0; off < bv.bv_len; off += blksize) {
 588                        /* Skip locate record. */
 589                        if (private->rdc_data.mode.bits.data_chain == 0)
 590                                ccw++;
 591                        if (dst) {
 592                                if (ccw->flags & CCW_FLAG_IDA)
 593                                        cda = *((char **)((addr_t) ccw->cda));
 594                                else
 595                                        cda = (char *)((addr_t) ccw->cda);
 596                                if (dst != cda) {
 597                                        if (rq_data_dir(req) == READ)
 598                                                memcpy(dst, cda, bv.bv_len);
 599                                        kmem_cache_free(dasd_page_cache,
 600                                            (void *)((addr_t)cda & PAGE_MASK));
 601                                }
 602                                dst = NULL;
 603                        }
 604                        ccw++;
 605                }
 606        }
 607out:
 608        status = cqr->status == DASD_CQR_DONE;
 609        dasd_sfree_request(cqr, cqr->memdev);
 610        return status;
 611}
 612
 613static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
 614{
 615        if (cqr->retries < 0)
 616                cqr->status = DASD_CQR_FAILED;
 617        else
 618                cqr->status = DASD_CQR_FILLED;
 619};
 620
 621static int
 622dasd_fba_fill_info(struct dasd_device * device,
 623                   struct dasd_information2_t * info)
 624{
 625        struct dasd_fba_private *private = device->private;
 626
 627        info->label_block = 1;
 628        info->FBA_layout = 1;
 629        info->format = DASD_FORMAT_LDL;
 630        info->characteristics_size = sizeof(private->rdc_data);
 631        memcpy(info->characteristics, &private->rdc_data,
 632               sizeof(private->rdc_data));
 633        info->confdata_size = 0;
 634        return 0;
 635}
 636
 637static void
 638dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
 639                        char *reason)
 640{
 641        u64 *sense;
 642
 643        sense = (u64 *) dasd_get_sense(irb);
 644        if (sense) {
 645                DBF_DEV_EVENT(DBF_EMERG, device,
 646                              "%s: %s %02x%02x%02x %016llx %016llx %016llx "
 647                              "%016llx", reason,
 648                              scsw_is_tm(&irb->scsw) ? "t" : "c",
 649                              scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
 650                              scsw_dstat(&irb->scsw), sense[0], sense[1],
 651                              sense[2], sense[3]);
 652        } else {
 653                DBF_DEV_EVENT(DBF_EMERG, device, "%s",
 654                              "SORRY - NO VALID SENSE AVAILABLE\n");
 655        }
 656}
 657
 658
 659static void
 660dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 661                    struct irb *irb)
 662{
 663        char *page;
 664        struct ccw1 *act, *end, *last;
 665        int len, sl, sct, count;
 666
 667        page = (char *) get_zeroed_page(GFP_ATOMIC);
 668        if (page == NULL) {
 669                DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 670                            "No memory to dump sense data");
 671                return;
 672        }
 673        len = sprintf(page, PRINTK_HEADER
 674                      " I/O status report for device %s:\n",
 675                      dev_name(&device->cdev->dev));
 676        len += sprintf(page + len, PRINTK_HEADER
 677                       " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
 678                       irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 679        len += sprintf(page + len, PRINTK_HEADER
 680                       " device %s: Failing CCW: %p\n",
 681                       dev_name(&device->cdev->dev),
 682                       (void *) (addr_t) irb->scsw.cmd.cpa);
 683        if (irb->esw.esw0.erw.cons) {
 684                for (sl = 0; sl < 4; sl++) {
 685                        len += sprintf(page + len, PRINTK_HEADER
 686                                       " Sense(hex) %2d-%2d:",
 687                                       (8 * sl), ((8 * sl) + 7));
 688
 689                        for (sct = 0; sct < 8; sct++) {
 690                                len += sprintf(page + len, " %02x",
 691                                               irb->ecw[8 * sl + sct]);
 692                        }
 693                        len += sprintf(page + len, "\n");
 694                }
 695        } else {
 696                len += sprintf(page + len, PRINTK_HEADER
 697                               " SORRY - NO VALID SENSE AVAILABLE\n");
 698        }
 699        printk(KERN_ERR "%s", page);
 700
 701        /* dump the Channel Program */
 702        /* print first CCWs (maximum 8) */
 703        act = req->cpaddr;
 704        for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 705        end = min(act + 8, last);
 706        len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
 707        while (act <= end) {
 708                len += sprintf(page + len, PRINTK_HEADER
 709                               " CCW %p: %08X %08X DAT:",
 710                               act, ((int *) act)[0], ((int *) act)[1]);
 711                for (count = 0; count < 32 && count < act->count;
 712                     count += sizeof(int))
 713                        len += sprintf(page + len, " %08X",
 714                                       ((int *) (addr_t) act->cda)
 715                                       [(count>>2)]);
 716                len += sprintf(page + len, "\n");
 717                act++;
 718        }
 719        printk(KERN_ERR "%s", page);
 720
 721
 722        /* print failing CCW area */
 723        len = 0;
 724        if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
 725                act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
 726                len += sprintf(page + len, PRINTK_HEADER "......\n");
 727        }
 728        end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
 729        while (act <= end) {
 730                len += sprintf(page + len, PRINTK_HEADER
 731                               " CCW %p: %08X %08X DAT:",
 732                               act, ((int *) act)[0], ((int *) act)[1]);
 733                for (count = 0; count < 32 && count < act->count;
 734                     count += sizeof(int))
 735                        len += sprintf(page + len, " %08X",
 736                                       ((int *) (addr_t) act->cda)
 737                                       [(count>>2)]);
 738                len += sprintf(page + len, "\n");
 739                act++;
 740        }
 741
 742        /* print last CCWs */
 743        if (act <  last - 2) {
 744                act = last - 2;
 745                len += sprintf(page + len, PRINTK_HEADER "......\n");
 746        }
 747        while (act <= last) {
 748                len += sprintf(page + len, PRINTK_HEADER
 749                               " CCW %p: %08X %08X DAT:",
 750                               act, ((int *) act)[0], ((int *) act)[1]);
 751                for (count = 0; count < 32 && count < act->count;
 752                     count += sizeof(int))
 753                        len += sprintf(page + len, " %08X",
 754                                       ((int *) (addr_t) act->cda)
 755                                       [(count>>2)]);
 756                len += sprintf(page + len, "\n");
 757                act++;
 758        }
 759        if (len > 0)
 760                printk(KERN_ERR "%s", page);
 761        free_page((unsigned long) page);
 762}
 763
 764/*
 765 * Initialize block layer request queue.
 766 */
 767static void dasd_fba_setup_blk_queue(struct dasd_block *block)
 768{
 769        unsigned int logical_block_size = block->bp_block;
 770        struct request_queue *q = block->request_queue;
 771        unsigned int max_bytes, max_discard_sectors;
 772        int max;
 773
 774        max = DASD_FBA_MAX_BLOCKS << block->s2b_shift;
 775        blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
 776        q->limits.max_dev_sectors = max;
 777        blk_queue_logical_block_size(q, logical_block_size);
 778        blk_queue_max_hw_sectors(q, max);
 779        blk_queue_max_segments(q, USHRT_MAX);
 780        /* With page sized segments each segment can be translated into one idaw/tidaw */
 781        blk_queue_max_segment_size(q, PAGE_SIZE);
 782        blk_queue_segment_boundary(q, PAGE_SIZE - 1);
 783
 784        q->limits.discard_granularity = logical_block_size;
 785        q->limits.discard_alignment = PAGE_SIZE;
 786
 787        /* Calculate max_discard_sectors and make it PAGE aligned */
 788        max_bytes = USHRT_MAX * logical_block_size;
 789        max_bytes = ALIGN_DOWN(max_bytes, PAGE_SIZE);
 790        max_discard_sectors = max_bytes / logical_block_size;
 791
 792        blk_queue_max_discard_sectors(q, max_discard_sectors);
 793        blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
 794        blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 795}
 796
 797static int dasd_fba_pe_handler(struct dasd_device *device,
 798                               __u8 tbvpm, __u8 fcsecpm)
 799{
 800        return dasd_generic_verify_path(device, tbvpm);
 801}
 802
 803static struct dasd_discipline dasd_fba_discipline = {
 804        .owner = THIS_MODULE,
 805        .name = "FBA ",
 806        .ebcname = "FBA ",
 807        .check_device = dasd_fba_check_characteristics,
 808        .do_analysis = dasd_fba_do_analysis,
 809        .pe_handler = dasd_fba_pe_handler,
 810        .setup_blk_queue = dasd_fba_setup_blk_queue,
 811        .fill_geometry = dasd_fba_fill_geometry,
 812        .start_IO = dasd_start_IO,
 813        .term_IO = dasd_term_IO,
 814        .handle_terminated_request = dasd_fba_handle_terminated_request,
 815        .erp_action = dasd_fba_erp_action,
 816        .erp_postaction = dasd_fba_erp_postaction,
 817        .check_for_device_change = dasd_fba_check_for_device_change,
 818        .build_cp = dasd_fba_build_cp,
 819        .free_cp = dasd_fba_free_cp,
 820        .dump_sense = dasd_fba_dump_sense,
 821        .dump_sense_dbf = dasd_fba_dump_sense_dbf,
 822        .fill_info = dasd_fba_fill_info,
 823};
 824
 825static int __init
 826dasd_fba_init(void)
 827{
 828        int ret;
 829
 830        ASCEBC(dasd_fba_discipline.ebcname, 4);
 831
 832        dasd_fba_zero_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 833        if (!dasd_fba_zero_page)
 834                return -ENOMEM;
 835
 836        ret = ccw_driver_register(&dasd_fba_driver);
 837        if (!ret)
 838                wait_for_device_probe();
 839
 840        return ret;
 841}
 842
 843static void __exit
 844dasd_fba_cleanup(void)
 845{
 846        ccw_driver_unregister(&dasd_fba_driver);
 847        free_page((unsigned long)dasd_fba_zero_page);
 848}
 849
 850module_init(dasd_fba_init);
 851module_exit(dasd_fba_cleanup);
 852