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   1 /*
   2  * linux/drivers/s390/cio/cmf.c
   3  *
   4  * Linux on zSeries Channel Measurement Facility support
   5  *
   6  * Copyright 2000,2006 IBM Corporation
   7  *
   8  * Authors: Arnd Bergmann <arndb@de.ibm.com>
   9  *          Cornelia Huck <cornelia.huck@de.ibm.com>
  10  *
  11  * original idea from Natarajan Krishnaswami <nkrishna@us.ibm.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2, or (at your option)
  16  * any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/bootmem.h>
  29 #include <linux/device.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/slab.h>
  35 #include <linux/timex.h>        /* get_clock() */
  36
  37 #include <asm/ccwdev.h>
  38 #include <asm/cio.h>
  39 #include <asm/cmb.h>
  40 #include <asm/div64.h>
  41
  42 #include "cio.h"
  43 #include "css.h"
  44 #include "device.h"
  45 #include "ioasm.h"
  46 #include "chsc.h"
  47
  48 /*
  49  * parameter to enable cmf during boot, possible uses are:
  50  *  "s390cmf" -- enable cmf and allocate 2 MB of ram so measuring can be
  51  *               used on any subchannel
  52  *  "s390cmf=<num>" -- enable cmf and allocate enough memory to measure
  53  *                     <num> subchannel, where <num> is an integer
  54  *                     between 1 and 65535, default is 1024
  55  */
  56 #define ARGSTRING "s390cmf"
  57
  58 /* indices for READCMB */
  59 enum cmb_index {
  60  /* basic and exended format: */
  61         cmb_ssch_rsch_count,
  62         cmb_sample_count,
  63         cmb_device_connect_time,
  64         cmb_function_pending_time,
  65         cmb_device_disconnect_time,
  66         cmb_control_unit_queuing_time,
  67         cmb_device_active_only_time,
  68  /* extended format only: */
  69         cmb_device_busy_time,
  70         cmb_initial_command_response_time,
  71 };
  72
  73 /**
  74  * enum cmb_format - types of supported measurement block formats
  75  *
  76  * @CMF_BASIC:      traditional channel measurement blocks supported
  77  *                  by all machines that we run on
  78  * @CMF_EXTENDED:   improved format that was introduced with the z990
  79  *                  machine
  80  * @CMF_AUTODETECT: default: use extended format when running on a machine
  81  *                  supporting extended format, otherwise fall back to
  82  *                  basic format
  83  */
  84 enum cmb_format {
  85         CMF_BASIC,
  86         CMF_EXTENDED,
  87         CMF_AUTODETECT = -1,
  88 };
  89
  90 /*
  91  * format - actual format for all measurement blocks
  92  *
  93  * The format module parameter can be set to a value of 0 (zero)
  94  * or 1, indicating basic or extended format as described for
  95  * enum cmb_format.
  96  */
  97 static int format = CMF_AUTODETECT;
  98 module_param(format, bool, 0444);
  99
 100 /**
 101  * struct cmb_operations - functions to use depending on cmb_format
 102  *
 103  * Most of these functions operate on a struct ccw_device. There is only
 104  * one instance of struct cmb_operations because the format of the measurement
 105  * data is guaranteed to be the same for every ccw_device.
 106  *
 107  * @alloc:      allocate memory for a channel measurement block,
 108  *              either with the help of a special pool or with kmalloc
 109  * @free:       free memory allocated with @alloc
 110  * @set:        enable or disable measurement
 111  * @read:       read a measurement entry at an index
 112  * @readall:    read a measurement block in a common format
 113  * @reset:      clear the data in the associated measurement block and
 114  *              reset its time stamp
 115  * @align:      align an allocated block so that the hardware can use it
 116  */
 117 struct cmb_operations {
 118         int  (*alloc)  (struct ccw_device *);
 119         void (*free)   (struct ccw_device *);
 120         int  (*set)    (struct ccw_device *, u32);
 121         u64  (*read)   (struct ccw_device *, int);
 122         int  (*readall)(struct ccw_device *, struct cmbdata *);
 123         void (*reset)  (struct ccw_device *);
 124         void *(*align) (void *);
 125 /* private: */
 126         struct attribute_group *attr_group;
 127 };
 128 static struct cmb_operations *cmbops;
 129
 130 struct cmb_data {
 131         void *hw_block;   /* Pointer to block updated by hardware */
 132         void *last_block; /* Last changed block copied from hardware block */
 133         int size;         /* Size of hw_block and last_block */
 134         unsigned long long last_update;  /* when last_block was updated */
 135 };
 136
 137 /*
 138  * Our user interface is designed in terms of nanoseconds,
 139  * while the hardware measures total times in its own
 140  * unit.
 141  */
 142 static inline u64 time_to_nsec(u32 value)
 143 {
 144         return ((u64)value) * 128000ull;
 145 }
 146
 147 /*
 148  * Users are usually interested in average times,
 149  * not accumulated time.
 150  * This also helps us with atomicity problems
 151  * when reading sinlge values.
 152  */
 153 static inline u64 time_to_avg_nsec(u32 value, u32 count)
 154 {
 155         u64 ret;
 156
 157         /* no samples yet, avoid division by 0 */
 158         if (count == 0)
 159                 return 0;
 160
 161         /* value comes in units of 128 µsec */
 162         ret = time_to_nsec(value);
 163         do_div(ret, count);
 164
 165         return ret;
 166 }
 167
 168 /*
 169  * Activate or deactivate the channel monitor. When area is NULL,
 170  * the monitor is deactivated. The channel monitor needs to
 171  * be active in order to measure subchannels, which also need
 172  * to be enabled.
 173  */
 174 static inline void cmf_activate(void *area, unsigned int onoff)
 175 {
 176         register void * __gpr2 asm("2");
 177         register long __gpr1 asm("1");
 178
 179         __gpr2 = area;
 180         __gpr1 = onoff ? 2 : 0;
 181         /* activate channel measurement */
 182         asm("schm" : : "d" (__gpr2), "d" (__gpr1) );
 183 }
 184
 185 static int set_schib(struct ccw_device *cdev, u32 mme, int mbfc,
 186                      unsigned long address)
 187 {
 188         int ret;
 189         int retry;
 190         struct subchannel *sch;
 191         struct schib *schib;
 192
 193         sch = to_subchannel(cdev->dev.parent);
 194         schib = &sch->schib;
 195         /* msch can silently fail, so do it again if necessary */
 196         for (retry = 0; retry < 3; retry++) {
 197                 /* prepare schib */
 198                 stsch(sch->schid, schib);
 199                 schib->pmcw.mme  = mme;
 200                 schib->pmcw.mbfc = mbfc;
 201                 /* address can be either a block address or a block index */
 202                 if (mbfc)
 203                         schib->mba = address;
 204                 else
 205                         schib->pmcw.mbi = address;
 206
 207                 /* try to submit it */
 208                 switch(ret = msch_err(sch->schid, schib)) {
 209                         case 0:
 210                                 break;
 211                         case 1:
 212                         case 2: /* in I/O or status pending */
 213                                 ret = -EBUSY;
 214                                 break;
 215                         case 3: /* subchannel is no longer valid */
 216                                 ret = -ENODEV;
 217                                 break;
 218                         default: /* msch caught an exception */
 219                                 ret = -EINVAL;
 220                                 break;
 221                 }
 222                 stsch(sch->schid, schib); /* restore the schib */
 223
 224                 if (ret)
 225                         break;
 226
 227                 /* check if it worked */
 228                 if (schib->pmcw.mme  == mme &&
 229                     schib->pmcw.mbfc == mbfc &&
 230                     (mbfc ? (schib->mba == address)
 231                           : (schib->pmcw.mbi == address)))
 232                         return 0;
 233
 234                 ret = -EINVAL;
 235         }
 236
 237         return ret;
 238 }
 239
 240 struct set_schib_struct {
 241         u32 mme;
 242         int mbfc;
 243         unsigned long address;
 244         wait_queue_head_t wait;
 245         int ret;
 246         struct kref kref;
 247 };
 248
 249 static void cmf_set_schib_release(struct kref *kref)
 250 {
 251         struct set_schib_struct *set_data;
 252
 253         set_data = container_of(kref, struct set_schib_struct, kref);
 254         kfree(set_data);
 255 }
 256
 257 #define CMF_PENDING 1
 258
 259 static int set_schib_wait(struct ccw_device *cdev, u32 mme,
 260                                 int mbfc, unsigned long address)
 261 {
 262         struct set_schib_struct *set_data;
 263         int ret;
 264
 265         spin_lock_irq(cdev->ccwlock);
 266         if (!cdev->private->cmb) {
 267                 ret = -ENODEV;
 268                 goto out;
 269         }
 270         set_data = kzalloc(sizeof(struct set_schib_struct), GFP_ATOMIC);
 271         if (!set_data) {
 272                 ret = -ENOMEM;
 273                 goto out;
 274         }
 275         init_waitqueue_head(&set_data->wait);
 276         kref_init(&set_data->kref);
 277         set_data->mme = mme;
 278         set_data->mbfc = mbfc;
 279         set_data->address = address;
 280
 281         ret = set_schib(cdev, mme, mbfc, address);
 282         if (ret != -EBUSY)
 283                 goto out_put;
 284
 285         if (cdev->private->state != DEV_STATE_ONLINE) {
 286                 /* if the device is not online, don't even try again */
 287                 ret = -EBUSY;
 288                 goto out_put;
 289         }
 290
 291         cdev->private->state = DEV_STATE_CMFCHANGE;
 292         set_data->ret = CMF_PENDING;
 293         cdev->private->cmb_wait = set_data;
 294
 295         spin_unlock_irq(cdev->ccwlock);
 296         if (wait_event_interruptible(set_data->wait,
 297                                      set_data->ret != CMF_PENDING)) {
 298                 spin_lock_irq(cdev->ccwlock);
 299                 if (set_data->ret == CMF_PENDING) {
 300                         set_data->ret = -ERESTARTSYS;
 301                         if (cdev->private->state == DEV_STATE_CMFCHANGE)
 302                                 cdev->private->state = DEV_STATE_ONLINE;
 303                 }
 304                 spin_unlock_irq(cdev->ccwlock);
 305         }
 306         spin_lock_irq(cdev->ccwlock);
 307         cdev->private->cmb_wait = NULL;
 308         ret = set_data->ret;
 309 out_put:
 310         kref_put(&set_data->kref, cmf_set_schib_release);
 311 out:
 312         spin_unlock_irq(cdev->ccwlock);
 313         return ret;
 314 }
 315
 316 void retry_set_schib(struct ccw_device *cdev)
 317 {
 318         struct set_schib_struct *set_data;
 319
 320         set_data = cdev->private->cmb_wait;
 321         if (!set_data) {
 322                 WARN_ON(1);
 323                 return;
 324         }
 325         kref_get(&set_data->kref);
 326         set_data->ret = set_schib(cdev, set_data->mme, set_data->mbfc,
 327                                   set_data->address);
 328         wake_up(&set_data->wait);
 329         kref_put(&set_data->kref, cmf_set_schib_release);
 330 }
 331
 332 static int cmf_copy_block(struct ccw_device *cdev)
 333 {
 334         struct subchannel *sch;
 335         void *reference_buf;
 336         void *hw_block;
 337         struct cmb_data *cmb_data;
 338
 339         sch = to_subchannel(cdev->dev.parent);
 340
 341         if (stsch(sch->schid, &sch->schib))
 342                 return -ENODEV;
 343
 344         if (sch->schib.scsw.fctl & SCSW_FCTL_START_FUNC) {
 345                 /* Don't copy if a start function is in progress. */
 346                 if ((!sch->schib.scsw.actl & SCSW_ACTL_SUSPENDED) &&
 347                     (sch->schib.scsw.actl &
 348                      (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) &&
 349                     (!sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS))
 350                         return -EBUSY;
 351         }
 352         cmb_data = cdev->private->cmb;
 353         hw_block = cmbops->align(cmb_data->hw_block);
 354         if (!memcmp(cmb_data->last_block, hw_block, cmb_data->size))
 355                 /* No need to copy. */
 356                 return 0;
 357         reference_buf = kzalloc(cmb_data->size, GFP_ATOMIC);
 358         if (!reference_buf)
 359                 return -ENOMEM;
 360         /* Ensure consistency of block copied from hardware. */
 361         do {
 362                 memcpy(cmb_data->last_block, hw_block, cmb_data->size);
 363                 memcpy(reference_buf, hw_block, cmb_data->size);
 364         } while (memcmp(cmb_data->last_block, reference_buf, cmb_data->size));
 365         cmb_data->last_update = get_clock();
 366         kfree(reference_buf);
 367         return 0;
 368 }
 369
 370 struct copy_block_struct {
 371         wait_queue_head_t wait;
 372         int ret;
 373         struct kref kref;
 374 };
 375
 376 static void cmf_copy_block_release(struct kref *kref)
 377 {
 378         struct copy_block_struct *copy_block;
 379
 380         copy_block = container_of(kref, struct copy_block_struct, kref);
 381         kfree(copy_block);
 382 }
 383
 384 static int cmf_cmb_copy_wait(struct ccw_device *cdev)
 385 {
 386         struct copy_block_struct *copy_block;
 387         int ret;
 388         unsigned long flags;
 389
 390         spin_lock_irqsave(cdev->ccwlock, flags);
 391         if (!cdev->private->cmb) {
 392                 ret = -ENODEV;
 393                 goto out;
 394         }
 395         copy_block = kzalloc(sizeof(struct copy_block_struct), GFP_ATOMIC);
 396         if (!copy_block) {
 397                 ret = -ENOMEM;
 398                 goto out;
 399         }
 400         init_waitqueue_head(&copy_block->wait);
 401         kref_init(&copy_block->kref);
 402
 403         ret = cmf_copy_block(cdev);
 404         if (ret != -EBUSY)
 405                 goto out_put;
 406
 407         if (cdev->private->state != DEV_STATE_ONLINE) {
 408                 ret = -EBUSY;
 409                 goto out_put;
 410         }
 411
 412         cdev->private->state = DEV_STATE_CMFUPDATE;
 413         copy_block->ret = CMF_PENDING;
 414         cdev->private->cmb_wait = copy_block;
 415
 416         spin_unlock_irqrestore(cdev->ccwlock, flags);
 417         if (wait_event_interruptible(copy_block->wait,
 418                                      copy_block->ret != CMF_PENDING)) {
 419                 spin_lock_irqsave(cdev->ccwlock, flags);
 420                 if (copy_block->ret == CMF_PENDING) {
 421                         copy_block->ret = -ERESTARTSYS;
 422                         if (cdev->private->state == DEV_STATE_CMFUPDATE)
 423                                 cdev->private->state = DEV_STATE_ONLINE;
 424                 }
 425                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 426         }
 427         spin_lock_irqsave(cdev->ccwlock, flags);
 428         cdev->private->cmb_wait = NULL;
 429         ret = copy_block->ret;
 430 out_put:
 431         kref_put(&copy_block->kref, cmf_copy_block_release);
 432 out:
 433         spin_unlock_irqrestore(cdev->ccwlock, flags);
 434         return ret;
 435 }
 436
 437 void cmf_retry_copy_block(struct ccw_device *cdev)
 438 {
 439         struct copy_block_struct *copy_block;
 440
 441         copy_block = cdev->private->cmb_wait;
 442         if (!copy_block) {
 443                 WARN_ON(1);
 444                 return;
 445         }
 446         kref_get(&copy_block->kref);
 447         copy_block->ret = cmf_copy_block(cdev);
 448         wake_up(&copy_block->wait);
 449         kref_put(&copy_block->kref, cmf_copy_block_release);
 450 }
 451
 452 static void cmf_generic_reset(struct ccw_device *cdev)
 453 {
 454         struct cmb_data *cmb_data;
 455
 456         spin_lock_irq(cdev->ccwlock);
 457         cmb_data = cdev->private->cmb;
 458         if (cmb_data) {
 459                 memset(cmb_data->last_block, 0, cmb_data->size);
 460                 /*
 461                  * Need to reset hw block as well to make the hardware start
 462                  * from 0 again.
 463                  */
 464                 memset(cmbops->align(cmb_data->hw_block), 0, cmb_data->size);
 465                 cmb_data->last_update = 0;
 466         }
 467         cdev->private->cmb_start_time = get_clock();
 468         spin_unlock_irq(cdev->ccwlock);
 469 }
 470
 471 /**
 472  * struct cmb_area - container for global cmb data
 473  *
 474  * @mem:        pointer to CMBs (only in basic measurement mode)
 475  * @list:       contains a linked list of all subchannels
 476  * @num_channels: number of channels to be measured
 477  * @lock:       protect concurrent access to @mem and @list
 478  */
 479 struct cmb_area {
 480         struct cmb *mem;
 481         struct list_head list;
 482         int num_channels;
 483         spinlock_t lock;
 484 };
 485
 486 static struct cmb_area cmb_area = {
 487         .lock = __SPIN_LOCK_UNLOCKED(cmb_area.lock),
 488         .list = LIST_HEAD_INIT(cmb_area.list),
 489         .num_channels  = 1024,
 490 };
 491
 492 \f
 493 /* ****** old style CMB handling ********/
 494
 495 /*
 496  * Basic channel measurement blocks are allocated in one contiguous
 497  * block of memory, which can not be moved as long as any channel
 498  * is active. Therefore, a maximum number of subchannels needs to
 499  * be defined somewhere. This is a module parameter, defaulting to
 500  * a resonable value of 1024, or 32 kb of memory.
 501  * Current kernels don't allow kmalloc with more than 128kb, so the
 502  * maximum is 4096.
 503  */
 504
 505 module_param_named(maxchannels, cmb_area.num_channels, uint, 0444);
 506
 507 /**
 508  * struct cmb - basic channel measurement block
 509  * @ssch_rsch_count: number of ssch and rsch
 510  * @sample_count: number of samples
 511  * @device_connect_time: time of device connect
 512  * @function_pending_time: time of function pending
 513  * @device_disconnect_time: time of device disconnect
 514  * @control_unit_queuing_time: time of control unit queuing
 515  * @device_active_only_time: time of device active only
 516  * @reserved: unused in basic measurement mode
 517  *
 518  * The measurement block as used by the hardware. The fields are described
 519  * further in z/Architecture Principles of Operation, chapter 17.
 520  *
 521  * The cmb area made up from these blocks must be a contiguous array and may
 522  * not be reallocated or freed.
 523  * Only one cmb area can be present in the system.
 524  */
 525 struct cmb {
 526         u16 ssch_rsch_count;
 527         u16 sample_count;
 528         u32 device_connect_time;
 529         u32 function_pending_time;
 530         u32 device_disconnect_time;
 531         u32 control_unit_queuing_time;
 532         u32 device_active_only_time;
 533         u32 reserved[2];
 534 };
 535
 536 /*
 537  * Insert a single device into the cmb_area list.
 538  * Called with cmb_area.lock held from alloc_cmb.
 539  */
 540 static int alloc_cmb_single(struct ccw_device *cdev,
 541                             struct cmb_data *cmb_data)
 542 {
 543         struct cmb *cmb;
 544         struct ccw_device_private *node;
 545         int ret;
 546
 547         spin_lock_irq(cdev->ccwlock);
 548         if (!list_empty(&cdev->private->cmb_list)) {
 549                 ret = -EBUSY;
 550                 goto out;
 551         }
 552
 553         /*
 554          * Find first unused cmb in cmb_area.mem.
 555          * This is a little tricky: cmb_area.list
 556          * remains sorted by ->cmb->hw_data pointers.
 557          */
 558         cmb = cmb_area.mem;
 559         list_for_each_entry(node, &cmb_area.list, cmb_list) {
 560                 struct cmb_data *data;
 561                 data = node->cmb;
 562                 if ((struct cmb*)data->hw_block > cmb)
 563                         break;
 564                 cmb++;
 565         }
 566         if (cmb - cmb_area.mem >= cmb_area.num_channels) {
 567                 ret = -ENOMEM;
 568                 goto out;
 569         }
 570
 571         /* insert new cmb */
 572         list_add_tail(&cdev->private->cmb_list, &node->cmb_list);
 573         cmb_data->hw_block = cmb;
 574         cdev->private->cmb = cmb_data;
 575         ret = 0;
 576 out:
 577         spin_unlock_irq(cdev->ccwlock);
 578         return ret;
 579 }
 580
 581 static int alloc_cmb(struct ccw_device *cdev)
 582 {
 583         int ret;
 584         struct cmb *mem;
 585         ssize_t size;
 586         struct cmb_data *cmb_data;
 587
 588         /* Allocate private cmb_data. */
 589         cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL);
 590         if (!cmb_data)
 591                 return -ENOMEM;
 592
 593         cmb_data->last_block = kzalloc(sizeof(struct cmb), GFP_KERNEL);
 594         if (!cmb_data->last_block) {
 595                 kfree(cmb_data);
 596                 return -ENOMEM;
 597         }
 598         cmb_data->size = sizeof(struct cmb);
 599         spin_lock(&cmb_area.lock);
 600
 601         if (!cmb_area.mem) {
 602                 /* there is no user yet, so we need a new area */
 603                 size = sizeof(struct cmb) * cmb_area.num_channels;
 604                 WARN_ON(!list_empty(&cmb_area.list));
 605
 606                 spin_unlock(&cmb_area.lock);
 607                 mem = (void*)__get_free_pages(GFP_KERNEL | GFP_DMA,
 608                                  get_order(size));
 609                 spin_lock(&cmb_area.lock);
 610
 611                 if (cmb_area.mem) {
 612                         /* ok, another thread was faster */
 613                         free_pages((unsigned long)mem, get_order(size));
 614                 } else if (!mem) {
 615                         /* no luck */
 616                         printk(KERN_WARNING "cio: failed to allocate area "
 617                                "for measuring %d subchannels\n",
 618                                cmb_area.num_channels);
 619                         ret = -ENOMEM;
 620                         goto out;
 621                 } else {
 622                         /* everything ok */
 623                         memset(mem, 0, size);
 624                         cmb_area.mem = mem;
 625                         cmf_activate(cmb_area.mem, 1);
 626                 }
 627         }
 628
 629         /* do the actual allocation */
 630         ret = alloc_cmb_single(cdev, cmb_data);
 631 out:
 632         spin_unlock(&cmb_area.lock);
 633         if (ret) {
 634                 kfree(cmb_data->last_block);
 635                 kfree(cmb_data);
 636         }
 637         return ret;
 638 }
 639
 640 static void free_cmb(struct ccw_device *cdev)
 641 {
 642         struct ccw_device_private *priv;
 643         struct cmb_data *cmb_data;
 644
 645         spin_lock(&cmb_area.lock);
 646         spin_lock_irq(cdev->ccwlock);
 647
 648         priv = cdev->private;
 649
 650         if (list_empty(&priv->cmb_list)) {
 651                 /* already freed */
 652                 goto out;
 653         }
 654
 655         cmb_data = priv->cmb;
 656         priv->cmb = NULL;
 657         if (cmb_data)
 658                 kfree(cmb_data->last_block);
 659         kfree(cmb_data);
 660         list_del_init(&priv->cmb_list);
 661
 662         if (list_empty(&cmb_area.list)) {
 663                 ssize_t size;
 664                 size = sizeof(struct cmb) * cmb_area.num_channels;
 665                 cmf_activate(NULL, 0);
 666                 free_pages((unsigned long)cmb_area.mem, get_order(size));
 667                 cmb_area.mem = NULL;
 668         }
 669 out:
 670         spin_unlock_irq(cdev->ccwlock);
 671         spin_unlock(&cmb_area.lock);
 672 }
 673
 674 static int set_cmb(struct ccw_device *cdev, u32 mme)
 675 {
 676         u16 offset;
 677         struct cmb_data *cmb_data;
 678         unsigned long flags;
 679
 680         spin_lock_irqsave(cdev->ccwlock, flags);
 681         if (!cdev->private->cmb) {
 682                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 683                 return -EINVAL;
 684         }
 685         cmb_data = cdev->private->cmb;
 686         offset = mme ? (struct cmb *)cmb_data->hw_block - cmb_area.mem : 0;
 687         spin_unlock_irqrestore(cdev->ccwlock, flags);
 688
 689         return set_schib_wait(cdev, mme, 0, offset);
 690 }
 691
 692 static u64 read_cmb(struct ccw_device *cdev, int index)
 693 {
 694         struct cmb *cmb;
 695         u32 val;
 696         int ret;
 697         unsigned long flags;
 698
 699         ret = cmf_cmb_copy_wait(cdev);
 700         if (ret < 0)
 701                 return 0;
 702
 703         spin_lock_irqsave(cdev->ccwlock, flags);
 704         if (!cdev->private->cmb) {
 705                 ret = 0;
 706                 goto out;
 707         }
 708         cmb = ((struct cmb_data *)cdev->private->cmb)->last_block;
 709
 710         switch (index) {
 711         case cmb_ssch_rsch_count:
 712                 ret = cmb->ssch_rsch_count;
 713                 goto out;
 714         case cmb_sample_count:
 715                 ret = cmb->sample_count;
 716                 goto out;
 717         case cmb_device_connect_time:
 718                 val = cmb->device_connect_time;
 719                 break;
 720         case cmb_function_pending_time:
 721                 val = cmb->function_pending_time;
 722                 break;
 723         case cmb_device_disconnect_time:
 724                 val = cmb->device_disconnect_time;
 725                 break;
 726         case cmb_control_unit_queuing_time:
 727                 val = cmb->control_unit_queuing_time;
 728                 break;
 729         case cmb_device_active_only_time:
 730                 val = cmb->device_active_only_time;
 731                 break;
 732         default:
 733                 ret = 0;
 734                 goto out;
 735         }
 736         ret = time_to_avg_nsec(val, cmb->sample_count);
 737 out:
 738         spin_unlock_irqrestore(cdev->ccwlock, flags);
 739         return ret;
 740 }
 741
 742 static int readall_cmb(struct ccw_device *cdev, struct cmbdata *data)
 743 {
 744         struct cmb *cmb;
 745         struct cmb_data *cmb_data;
 746         u64 time;
 747         unsigned long flags;
 748         int ret;
 749
 750         ret = cmf_cmb_copy_wait(cdev);
 751         if (ret < 0)
 752                 return ret;
 753         spin_lock_irqsave(cdev->ccwlock, flags);
 754         cmb_data = cdev->private->cmb;
 755         if (!cmb_data) {
 756                 ret = -ENODEV;
 757                 goto out;
 758         }
 759         if (cmb_data->last_update == 0) {
 760                 ret = -EAGAIN;
 761                 goto out;
 762         }
 763         cmb = cmb_data->last_block;
 764         time = cmb_data->last_update - cdev->private->cmb_start_time;
 765
 766         memset(data, 0, sizeof(struct cmbdata));
 767
 768         /* we only know values before device_busy_time */
 769         data->size = offsetof(struct cmbdata, device_busy_time);
 770
 771         /* convert to nanoseconds */
 772         data->elapsed_time = (time * 1000) >> 12;
 773
 774         /* copy data to new structure */
 775         data->ssch_rsch_count = cmb->ssch_rsch_count;
 776         data->sample_count = cmb->sample_count;
 777
 778         /* time fields are converted to nanoseconds while copying */
 779         data->device_connect_time = time_to_nsec(cmb->device_connect_time);
 780         data->function_pending_time = time_to_nsec(cmb->function_pending_time);
 781         data->device_disconnect_time =
 782                 time_to_nsec(cmb->device_disconnect_time);
 783         data->control_unit_queuing_time
 784                 = time_to_nsec(cmb->control_unit_queuing_time);
 785         data->device_active_only_time
 786                 = time_to_nsec(cmb->device_active_only_time);
 787         ret = 0;
 788 out:
 789         spin_unlock_irqrestore(cdev->ccwlock, flags);
 790         return ret;
 791 }
 792
 793 static void reset_cmb(struct ccw_device *cdev)
 794 {
 795         cmf_generic_reset(cdev);
 796 }
 797
 798 static void * align_cmb(void *area)
 799 {
 800         return area;
 801 }
 802
 803 static struct attribute_group cmf_attr_group;
 804
 805 static struct cmb_operations cmbops_basic = {
 806         .alloc  = alloc_cmb,
 807         .free   = free_cmb,
 808         .set    = set_cmb,
 809         .read   = read_cmb,
 810         .readall    = readall_cmb,
 811         .reset      = reset_cmb,
 812         .align      = align_cmb,
 813         .attr_group = &cmf_attr_group,
 814 };
 815 \f
 816 /* ******** extended cmb handling ********/
 817
 818 /**
 819  * struct cmbe - extended channel measurement block
 820  * @ssch_rsch_count: number of ssch and rsch
 821  * @sample_count: number of samples
 822  * @device_connect_time: time of device connect
 823  * @function_pending_time: time of function pending
 824  * @device_disconnect_time: time of device disconnect
 825  * @control_unit_queuing_time: time of control unit queuing
 826  * @device_active_only_time: time of device active only
 827  * @device_busy_time: time of device busy
 828  * @initial_command_response_time: initial command response time
 829  * @reserved: unused
 830  *
 831  * The measurement block as used by the hardware. May be in any 64 bit physical
 832  * location.
 833  * The fields are described further in z/Architecture Principles of Operation,
 834  * third edition, chapter 17.
 835  */
 836 struct cmbe {
 837         u32 ssch_rsch_count;
 838         u32 sample_count;
 839         u32 device_connect_time;
 840         u32 function_pending_time;
 841         u32 device_disconnect_time;
 842         u32 control_unit_queuing_time;
 843         u32 device_active_only_time;
 844         u32 device_busy_time;
 845         u32 initial_command_response_time;
 846         u32 reserved[7];
 847 };
 848
 849 /*
 850  * kmalloc only guarantees 8 byte alignment, but we need cmbe
 851  * pointers to be naturally aligned. Make sure to allocate
 852  * enough space for two cmbes.
 853  */
 854 static inline struct cmbe *cmbe_align(struct cmbe *c)
 855 {
 856         unsigned long addr;
 857         addr = ((unsigned long)c + sizeof (struct cmbe) - sizeof(long)) &
 858                                  ~(sizeof (struct cmbe) - sizeof(long));
 859         return (struct cmbe*)addr;
 860 }
 861
 862 static int alloc_cmbe(struct ccw_device *cdev)
 863 {
 864         struct cmbe *cmbe;
 865         struct cmb_data *cmb_data;
 866         int ret;
 867
 868         cmbe = kzalloc (sizeof (*cmbe) * 2, GFP_KERNEL);
 869         if (!cmbe)
 870                 return -ENOMEM;
 871         cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL);
 872         if (!cmb_data) {
 873                 ret = -ENOMEM;
 874                 goto out_free;
 875         }
 876         cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL);
 877         if (!cmb_data->last_block) {
 878                 ret = -ENOMEM;
 879                 goto out_free;
 880         }
 881         cmb_data->size = sizeof(struct cmbe);
 882         spin_lock_irq(cdev->ccwlock);
 883         if (cdev->private->cmb) {
 884                 spin_unlock_irq(cdev->ccwlock);
 885                 ret = -EBUSY;
 886                 goto out_free;
 887         }
 888         cmb_data->hw_block = cmbe;
 889         cdev->private->cmb = cmb_data;
 890         spin_unlock_irq(cdev->ccwlock);
 891
 892         /* activate global measurement if this is the first channel */
 893         spin_lock(&cmb_area.lock);
 894         if (list_empty(&cmb_area.list))
 895                 cmf_activate(NULL, 1);
 896         list_add_tail(&cdev->private->cmb_list, &cmb_area.list);
 897         spin_unlock(&cmb_area.lock);
 898
 899         return 0;
 900 out_free:
 901         if (cmb_data)
 902                 kfree(cmb_data->last_block);
 903         kfree(cmb_data);
 904         kfree(cmbe);
 905         return ret;
 906 }
 907
 908 static void free_cmbe(struct ccw_device *cdev)
 909 {
 910         struct cmb_data *cmb_data;
 911
 912         spin_lock_irq(cdev->ccwlock);
 913         cmb_data = cdev->private->cmb;
 914         cdev->private->cmb = NULL;
 915         if (cmb_data)
 916                 kfree(cmb_data->last_block);
 917         kfree(cmb_data);
 918         spin_unlock_irq(cdev->ccwlock);
 919
 920         /* deactivate global measurement if this is the last channel */
 921         spin_lock(&cmb_area.lock);
 922         list_del_init(&cdev->private->cmb_list);
 923         if (list_empty(&cmb_area.list))
 924                 cmf_activate(NULL, 0);
 925         spin_unlock(&cmb_area.lock);
 926 }
 927
 928 static int set_cmbe(struct ccw_device *cdev, u32 mme)
 929 {
 930         unsigned long mba;
 931         struct cmb_data *cmb_data;
 932         unsigned long flags;
 933
 934         spin_lock_irqsave(cdev->ccwlock, flags);
 935         if (!cdev->private->cmb) {
 936                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 937                 return -EINVAL;
 938         }
 939         cmb_data = cdev->private->cmb;
 940         mba = mme ? (unsigned long) cmbe_align(cmb_data->hw_block) : 0;
 941         spin_unlock_irqrestore(cdev->ccwlock, flags);
 942
 943         return set_schib_wait(cdev, mme, 1, mba);
 944 }
 945
 946
 947 static u64 read_cmbe(struct ccw_device *cdev, int index)
 948 {
 949         struct cmbe *cmb;
 950         struct cmb_data *cmb_data;
 951         u32 val;
 952         int ret;
 953         unsigned long flags;
 954
 955         ret = cmf_cmb_copy_wait(cdev);
 956         if (ret < 0)
 957                 return 0;
 958
 959         spin_lock_irqsave(cdev->ccwlock, flags);
 960         cmb_data = cdev->private->cmb;
 961         if (!cmb_data) {
 962                 ret = 0;
 963                 goto out;
 964         }
 965         cmb = cmb_data->last_block;
 966
 967         switch (index) {
 968         case cmb_ssch_rsch_count:
 969                 ret = cmb->ssch_rsch_count;
 970                 goto out;
 971         case cmb_sample_count:
 972                 ret = cmb->sample_count;
 973                 goto out;
 974         case cmb_device_connect_time:
 975                 val = cmb->device_connect_time;
 976                 break;
 977         case cmb_function_pending_time:
 978                 val = cmb->function_pending_time;
 979                 break;
 980         case cmb_device_disconnect_time:
 981                 val = cmb->device_disconnect_time;
 982                 break;
 983         case cmb_control_unit_queuing_time:
 984                 val = cmb->control_unit_queuing_time;
 985                 break;
 986         case cmb_device_active_only_time:
 987                 val = cmb->device_active_only_time;
 988                 break;
 989         case cmb_device_busy_time:
 990                 val = cmb->device_busy_time;
 991                 break;
 992         case cmb_initial_command_response_time:
 993                 val = cmb->initial_command_response_time;
 994                 break;
 995         default:
 996                 ret = 0;
 997                 goto out;
 998         }
 999         ret = time_to_avg_nsec(val, cmb->sample_count);
1000 out:
1001         spin_unlock_irqrestore(cdev->ccwlock, flags);
1002         return ret;
1003 }
1004
1005 static int readall_cmbe(struct ccw_device *cdev, struct cmbdata *data)
1006 {
1007         struct cmbe *cmb;
1008         struct cmb_data *cmb_data;
1009         u64 time;
1010         unsigned long flags;
1011         int ret;
1012
1013         ret = cmf_cmb_copy_wait(cdev);
1014         if (ret < 0)
1015                 return ret;
1016         spin_lock_irqsave(cdev->ccwlock, flags);
1017         cmb_data = cdev->private->cmb;
1018         if (!cmb_data) {
1019                 ret = -ENODEV;
1020                 goto out;
1021         }
1022         if (cmb_data->last_update == 0) {
1023                 ret = -EAGAIN;
1024                 goto out;
1025         }
1026         time = cmb_data->last_update - cdev->private->cmb_start_time;
1027
1028         memset (data, 0, sizeof(struct cmbdata));
1029
1030         /* we only know values before device_busy_time */
1031         data->size = offsetof(struct cmbdata, device_busy_time);
1032
1033         /* conver to nanoseconds */
1034         data->elapsed_time = (time * 1000) >> 12;
1035
1036         cmb = cmb_data->last_block;
1037         /* copy data to new structure */
1038         data->ssch_rsch_count = cmb->ssch_rsch_count;
1039         data->sample_count = cmb->sample_count;
1040
1041         /* time fields are converted to nanoseconds while copying */
1042         data->device_connect_time = time_to_nsec(cmb->device_connect_time);
1043         data->function_pending_time = time_to_nsec(cmb->function_pending_time);
1044         data->device_disconnect_time =
1045                 time_to_nsec(cmb->device_disconnect_time);
1046         data->control_unit_queuing_time
1047                 = time_to_nsec(cmb->control_unit_queuing_time);
1048         data->device_active_only_time
1049                 = time_to_nsec(cmb->device_active_only_time);
1050         data->device_busy_time = time_to_nsec(cmb->device_busy_time);
1051         data->initial_command_response_time
1052                 = time_to_nsec(cmb->initial_command_response_time);
1053
1054         ret = 0;
1055 out:
1056         spin_unlock_irqrestore(cdev->ccwlock, flags);
1057         return ret;
1058 }
1059
1060 static void reset_cmbe(struct ccw_device *cdev)
1061 {
1062         cmf_generic_reset(cdev);
1063 }
1064
1065 static void * align_cmbe(void *area)
1066 {
1067         return cmbe_align(area);
1068 }
1069
1070 static struct attribute_group cmf_attr_group_ext;
1071
1072 static struct cmb_operations cmbops_extended = {
1073         .alloc      = alloc_cmbe,
1074         .free       = free_cmbe,
1075         .set        = set_cmbe,
1076         .read       = read_cmbe,
1077         .readall    = readall_cmbe,
1078         .reset      = reset_cmbe,
1079         .align      = align_cmbe,
1080         .attr_group = &cmf_attr_group_ext,
1081 };
1082 \f
1083
1084 static ssize_t cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx)
1085 {
1086         return sprintf(buf, "%lld\n",
1087                 (unsigned long long) cmf_read(to_ccwdev(dev), idx));
1088 }
1089
1090 static ssize_t cmb_show_avg_sample_interval(struct device *dev,
1091                                             struct device_attribute *attr,
1092                                             char *buf)
1093 {
1094         struct ccw_device *cdev;
1095         long interval;
1096         unsigned long count;
1097         struct cmb_data *cmb_data;
1098
1099         cdev = to_ccwdev(dev);
1100         count = cmf_read(cdev, cmb_sample_count);
1101         spin_lock_irq(cdev->ccwlock);
1102         cmb_data = cdev->private->cmb;
1103         if (count) {
1104                 interval = cmb_data->last_update -
1105                         cdev->private->cmb_start_time;
1106                 interval = (interval * 1000) >> 12;
1107                 interval /= count;
1108         } else
1109                 interval = -1;
1110         spin_unlock_irq(cdev->ccwlock);
1111         return sprintf(buf, "%ld\n", interval);
1112 }
1113
1114 static ssize_t cmb_show_avg_utilization(struct device *dev,
1115                                         struct device_attribute *attr,
1116                                         char *buf)
1117 {
1118         struct cmbdata data;
1119         u64 utilization;
1120         unsigned long t, u;
1121         int ret;
1122
1123         ret = cmf_readall(to_ccwdev(dev), &data);
1124         if (ret == -EAGAIN || ret == -ENODEV)
1125                 /* No data (yet/currently) available to use for calculation. */
1126                 return sprintf(buf, "n/a\n");
1127         else if (ret)
1128                 return ret;
1129
1130         utilization = data.device_connect_time +
1131                       data.function_pending_time +
1132                       data.device_disconnect_time;
1133
1134         /* shift to avoid long long division */
1135         while (-1ul < (data.elapsed_time | utilization)) {
1136                 utilization >>= 8;
1137                 data.elapsed_time >>= 8;
1138         }
1139
1140         /* calculate value in 0.1 percent units */
1141         t = (unsigned long) data.elapsed_time / 1000;
1142         u = (unsigned long) utilization / t;
1143
1144         return sprintf(buf, "%02ld.%01ld%%\n", u/ 10, u - (u/ 10) * 10);
1145 }
1146
1147 #define cmf_attr(name) \
1148 static ssize_t show_##name(struct device *dev, \
1149                            struct device_attribute *attr, char *buf)    \
1150 { return cmb_show_attr((dev), buf, cmb_##name); } \
1151 static DEVICE_ATTR(name, 0444, show_##name, NULL);
1152
1153 #define cmf_attr_avg(name) \
1154 static ssize_t show_avg_##name(struct device *dev, \
1155                                struct device_attribute *attr, char *buf) \
1156 { return cmb_show_attr((dev), buf, cmb_##name); } \
1157 static DEVICE_ATTR(avg_##name, 0444, show_avg_##name, NULL);
1158
1159 cmf_attr(ssch_rsch_count);
1160 cmf_attr(sample_count);
1161 cmf_attr_avg(device_connect_time);
1162 cmf_attr_avg(function_pending_time);
1163 cmf_attr_avg(device_disconnect_time);
1164 cmf_attr_avg(control_unit_queuing_time);
1165 cmf_attr_avg(device_active_only_time);
1166 cmf_attr_avg(device_busy_time);
1167 cmf_attr_avg(initial_command_response_time);
1168
1169 static DEVICE_ATTR(avg_sample_interval, 0444, cmb_show_avg_sample_interval,
1170                    NULL);
1171 static DEVICE_ATTR(avg_utilization, 0444, cmb_show_avg_utilization, NULL);
1172
1173 static struct attribute *cmf_attributes[] = {
1174         &dev_attr_avg_sample_interval.attr,
1175         &dev_attr_avg_utilization.attr,
1176         &dev_attr_ssch_rsch_count.attr,
1177         &dev_attr_sample_count.attr,
1178         &dev_attr_avg_device_connect_time.attr,
1179         &dev_attr_avg_function_pending_time.attr,
1180         &dev_attr_avg_device_disconnect_time.attr,
1181         &dev_attr_avg_control_unit_queuing_time.attr,
1182         &dev_attr_avg_device_active_only_time.attr,
1183         NULL,
1184 };
1185
1186 static struct attribute_group cmf_attr_group = {
1187         .name  = "cmf",
1188         .attrs = cmf_attributes,
1189 };
1190
1191 static struct attribute *cmf_attributes_ext[] = {
1192         &dev_attr_avg_sample_interval.attr,
1193         &dev_attr_avg_utilization.attr,
1194         &dev_attr_ssch_rsch_count.attr,
1195         &dev_attr_sample_count.attr,
1196         &dev_attr_avg_device_connect_time.attr,
1197         &dev_attr_avg_function_pending_time.attr,
1198         &dev_attr_avg_device_disconnect_time.attr,
1199         &dev_attr_avg_control_unit_queuing_time.attr,
1200         &dev_attr_avg_device_active_only_time.attr,
1201         &dev_attr_avg_device_busy_time.attr,
1202         &dev_attr_avg_initial_command_response_time.attr,
1203         NULL,
1204 };
1205
1206 static struct attribute_group cmf_attr_group_ext = {
1207         .name  = "cmf",
1208         .attrs = cmf_attributes_ext,
1209 };
1210
1211 static ssize_t cmb_enable_show(struct device *dev,
1212                                struct device_attribute *attr,
1213                                char *buf)
1214 {
1215         return sprintf(buf, "%d\n", to_ccwdev(dev)->private->cmb ? 1 : 0);
1216 }
1217
1218 static ssize_t cmb_enable_store(struct device *dev,
1219                                 struct device_attribute *attr, const char *buf,
1220                                 size_t c)
1221 {
1222         struct ccw_device *cdev;
1223         int ret;
1224
1225         cdev = to_ccwdev(dev);
1226
1227         switch (buf[0]) {
1228         case '0':
1229                 ret = disable_cmf(cdev);
1230                 if (ret)
1231                         dev_info(&cdev->dev, "disable_cmf failed (%d)\n", ret);
1232                 break;
1233         case '1':
1234                 ret = enable_cmf(cdev);
1235                 if (ret && ret != -EBUSY)
1236                         dev_info(&cdev->dev, "enable_cmf failed (%d)\n", ret);
1237                 break;
1238         }
1239
1240         return c;
1241 }
1242
1243 DEVICE_ATTR(cmb_enable, 0644, cmb_enable_show, cmb_enable_store);
1244
1245 /**
1246  * enable_cmf() - switch on the channel measurement for a specific device
1247  *  @cdev:      The ccw device to be enabled
1248  *
1249  *  Returns %0 for success or a negative error value.
1250  *
1251  *  Context:
1252  *    non-atomic
1253  */
1254 int enable_cmf(struct ccw_device *cdev)
1255 {
1256         int ret;
1257
1258         ret = cmbops->alloc(cdev);
1259         cmbops->reset(cdev);
1260         if (ret)
1261                 return ret;
1262         ret = cmbops->set(cdev, 2);
1263         if (ret) {
1264                 cmbops->free(cdev);
1265                 return ret;
1266         }
1267         ret = sysfs_create_group(&cdev->dev.kobj, cmbops->attr_group);
1268         if (!ret)
1269                 return 0;
1270         cmbops->set(cdev, 0);  //FIXME: this can fail
1271         cmbops->free(cdev);
1272         return ret;
1273 }
1274
1275 /**
1276  * disable_cmf() - switch off the channel measurement for a specific device
1277  *  @cdev:      The ccw device to be disabled
1278  *
1279  *  Returns %0 for success or a negative error value.
1280  *
1281  *  Context:
1282  *    non-atomic
1283  */
1284 int disable_cmf(struct ccw_device *cdev)
1285 {
1286         int ret;
1287
1288         ret = cmbops->set(cdev, 0);
1289         if (ret)
1290                 return ret;
1291         cmbops->free(cdev);
1292         sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group);
1293         return ret;
1294 }
1295
1296 /**
1297  * cmf_read() - read one value from the current channel measurement block
1298  * @cdev:       the channel to be read
1299  * @index:      the index of the value to be read
1300  *
1301  * Returns the value read or %0 if the value cannot be read.
1302  *
1303  *  Context:
1304  *    any
1305  */
1306 u64 cmf_read(struct ccw_device *cdev, int index)
1307 {
1308         return cmbops->read(cdev, index);
1309 }
1310
1311 /**
1312  * cmf_readall() - read the current channel measurement block
1313  * @cdev:       the channel to be read
1314  * @data:       a pointer to a data block that will be filled
1315  *
1316  * Returns %0 on success, a negative error value otherwise.
1317  *
1318  *  Context:
1319  *    any
1320  */
1321 int cmf_readall(struct ccw_device *cdev, struct cmbdata *data)
1322 {
1323         return cmbops->readall(cdev, data);
1324 }
1325
1326 /* Reenable cmf when a disconnected device becomes available again. */
1327 int cmf_reenable(struct ccw_device *cdev)
1328 {
1329         cmbops->reset(cdev);
1330         return cmbops->set(cdev, 2);
1331 }
1332
1333 static int __init init_cmf(void)
1334 {
1335         char *format_string;
1336         char *detect_string = "parameter";
1337
1338         /*
1339          * If the user did not give a parameter, see if we are running on a
1340          * machine supporting extended measurement blocks, otherwise fall back
1341          * to basic mode.
1342          */
1343         if (format == CMF_AUTODETECT) {
1344                 if (!css_characteristics_avail ||
1345                     !css_general_characteristics.ext_mb) {
1346                         format = CMF_BASIC;
1347                 } else {
1348                         format = CMF_EXTENDED;
1349                 }
1350                 detect_string = "autodetected";
1351         } else {
1352                 detect_string = "parameter";
1353         }
1354
1355         switch (format) {
1356         case CMF_BASIC:
1357                 format_string = "basic";
1358                 cmbops = &cmbops_basic;
1359                 break;
1360         case CMF_EXTENDED:
1361                 format_string = "extended";
1362                 cmbops = &cmbops_extended;
1363                 break;
1364         default:
1365                 printk(KERN_ERR "cio: Invalid format %d for channel "
1366                         "measurement facility\n", format);
1367                 return 1;
1368         }
1369
1370         printk(KERN_INFO "cio: Channel measurement facility using %s "
1371                "format (%s)\n", format_string, detect_string);
1372         return 0;
1373 }
1374
1375 module_init(init_cmf);
1376
1377
1378 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
1379 MODULE_LICENSE("GPL");
1380 MODULE_DESCRIPTION("channel measurement facility base driver\n"
1381                    "Copyright 2003 IBM Corporation\n");
1382
1383 EXPORT_SYMBOL_GPL(enable_cmf);
1384 EXPORT_SYMBOL_GPL(disable_cmf);
1385 EXPORT_SYMBOL_GPL(cmf_read);
1386 EXPORT_SYMBOL_GPL(cmf_readall);