1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Linux on zSeries Channel Measurement Facility support 4 * 5 * Copyright IBM Corp. 2000, 2006 6 * 7 * Authors: Arnd Bergmann <arndb@de.ibm.com> 8 * Cornelia Huck <cornelia.huck@de.ibm.com> 9 * 10 * original idea from Natarajan Krishnaswami <nkrishna@us.ibm.com> 11 */ 12 13#define KMSG_COMPONENT "cio" 14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 15 16#include <linux/memblock.h> 17#include <linux/device.h> 18#include <linux/init.h> 19#include <linux/list.h> 20#include <linux/export.h> 21#include <linux/moduleparam.h> 22#include <linux/slab.h> 23#include <linux/timex.h> /* get_tod_clock() */ 24 25#include <asm/ccwdev.h> 26#include <asm/cio.h> 27#include <asm/cmb.h> 28#include <asm/div64.h> 29 30#include "cio.h" 31#include "css.h" 32#include "device.h" 33#include "ioasm.h" 34#include "chsc.h" 35 36/* 37 * parameter to enable cmf during boot, possible uses are: 38 * "s390cmf" -- enable cmf and allocate 2 MB of ram so measuring can be 39 * used on any subchannel 40 * "s390cmf=<num>" -- enable cmf and allocate enough memory to measure 41 * <num> subchannel, where <num> is an integer 42 * between 1 and 65535, default is 1024 43 */ 44#define ARGSTRING "s390cmf" 45 46/* indices for READCMB */ 47enum cmb_index { 48 avg_utilization = -1, 49 /* basic and exended format: */ 50 cmb_ssch_rsch_count = 0, 51 cmb_sample_count, 52 cmb_device_connect_time, 53 cmb_function_pending_time, 54 cmb_device_disconnect_time, 55 cmb_control_unit_queuing_time, 56 cmb_device_active_only_time, 57 /* extended format only: */ 58 cmb_device_busy_time, 59 cmb_initial_command_response_time, 60}; 61 62/** 63 * enum cmb_format - types of supported measurement block formats 64 * 65 * @CMF_BASIC: traditional channel measurement blocks supported 66 * by all machines that we run on 67 * @CMF_EXTENDED: improved format that was introduced with the z990 68 * machine 69 * @CMF_AUTODETECT: default: use extended format when running on a machine 70 * supporting extended format, otherwise fall back to 71 * basic format 72 */ 73enum cmb_format { 74 CMF_BASIC, 75 CMF_EXTENDED, 76 CMF_AUTODETECT = -1, 77}; 78 79/* 80 * format - actual format for all measurement blocks 81 * 82 * The format module parameter can be set to a value of 0 (zero) 83 * or 1, indicating basic or extended format as described for 84 * enum cmb_format. 85 */ 86static int format = CMF_AUTODETECT; 87module_param(format, bint, 0444); 88 89/** 90 * struct cmb_operations - functions to use depending on cmb_format 91 * 92 * Most of these functions operate on a struct ccw_device. There is only 93 * one instance of struct cmb_operations because the format of the measurement 94 * data is guaranteed to be the same for every ccw_device. 95 * 96 * @alloc: allocate memory for a channel measurement block, 97 * either with the help of a special pool or with kmalloc 98 * @free: free memory allocated with @alloc 99 * @set: enable or disable measurement 100 * @read: read a measurement entry at an index 101 * @readall: read a measurement block in a common format 102 * @reset: clear the data in the associated measurement block and 103 * reset its time stamp 104 */ 105struct cmb_operations { 106 int (*alloc) (struct ccw_device *); 107 void (*free) (struct ccw_device *); 108 int (*set) (struct ccw_device *, u32); 109 u64 (*read) (struct ccw_device *, int); 110 int (*readall)(struct ccw_device *, struct cmbdata *); 111 void (*reset) (struct ccw_device *); 112/* private: */ 113 struct attribute_group *attr_group; 114}; 115static struct cmb_operations *cmbops; 116 117struct cmb_data { 118 void *hw_block; /* Pointer to block updated by hardware */ 119 void *last_block; /* Last changed block copied from hardware block */ 120 int size; /* Size of hw_block and last_block */ 121 unsigned long long last_update; /* when last_block was updated */ 122}; 123 124/* 125 * Our user interface is designed in terms of nanoseconds, 126 * while the hardware measures total times in its own 127 * unit. 128 */ 129static inline u64 time_to_nsec(u32 value) 130{ 131 return ((u64)value) * 128000ull; 132} 133 134/* 135 * Users are usually interested in average times, 136 * not accumulated time. 137 * This also helps us with atomicity problems 138 * when reading sinlge values. 139 */ 140static inline u64 time_to_avg_nsec(u32 value, u32 count) 141{ 142 u64 ret; 143 144 /* no samples yet, avoid division by 0 */ 145 if (count == 0) 146 return 0; 147 148 /* value comes in units of 128 µsec */ 149 ret = time_to_nsec(value); 150 do_div(ret, count); 151 152 return ret; 153} 154 155#define CMF_OFF 0 156#define CMF_ON 2 157 158/* 159 * Activate or deactivate the channel monitor. When area is NULL, 160 * the monitor is deactivated. The channel monitor needs to 161 * be active in order to measure subchannels, which also need 162 * to be enabled. 163 */ 164static inline void cmf_activate(void *area, unsigned int onoff) 165{ 166 /* activate channel measurement */ 167 asm volatile( 168 " lgr 1,%[r1]\n" 169 " lgr 2,%[mbo]\n" 170 " schm\n" 171 : 172 : [r1] "d" ((unsigned long)onoff), [mbo] "d" (area) 173 : "1", "2"); 174} 175 176static int set_schib(struct ccw_device *cdev, u32 mme, int mbfc, 177 unsigned long address) 178{ 179 struct subchannel *sch = to_subchannel(cdev->dev.parent); 180 int ret; 181 182 sch->config.mme = mme; 183 sch->config.mbfc = mbfc; 184 /* address can be either a block address or a block index */ 185 if (mbfc) 186 sch->config.mba = address; 187 else 188 sch->config.mbi = address; 189 190 ret = cio_commit_config(sch); 191 if (!mme && ret == -ENODEV) { 192 /* 193 * The task was to disable measurement block updates but 194 * the subchannel is already gone. Report success. 195 */ 196 ret = 0; 197 } 198 return ret; 199} 200 201struct set_schib_struct { 202 u32 mme; 203 int mbfc; 204 unsigned long address; 205 wait_queue_head_t wait; 206 int ret; 207}; 208 209#define CMF_PENDING 1 210#define SET_SCHIB_TIMEOUT (10 * HZ) 211 212static int set_schib_wait(struct ccw_device *cdev, u32 mme, 213 int mbfc, unsigned long address) 214{ 215 struct set_schib_struct set_data; 216 int ret = -ENODEV; 217 218 spin_lock_irq(cdev->ccwlock); 219 if (!cdev->private->cmb) 220 goto out; 221 222 ret = set_schib(cdev, mme, mbfc, address); 223 if (ret != -EBUSY) 224 goto out; 225 226 /* if the device is not online, don't even try again */ 227 if (cdev->private->state != DEV_STATE_ONLINE) 228 goto out; 229 230 init_waitqueue_head(&set_data.wait); 231 set_data.mme = mme; 232 set_data.mbfc = mbfc; 233 set_data.address = address; 234 set_data.ret = CMF_PENDING; 235 236 cdev->private->state = DEV_STATE_CMFCHANGE; 237 cdev->private->cmb_wait = &set_data; 238 spin_unlock_irq(cdev->ccwlock); 239 240 ret = wait_event_interruptible_timeout(set_data.wait, 241 set_data.ret != CMF_PENDING, 242 SET_SCHIB_TIMEOUT); 243 spin_lock_irq(cdev->ccwlock); 244 if (ret <= 0) { 245 if (set_data.ret == CMF_PENDING) { 246 set_data.ret = (ret == 0) ? -ETIME : ret; 247 if (cdev->private->state == DEV_STATE_CMFCHANGE) 248 cdev->private->state = DEV_STATE_ONLINE; 249 } 250 } 251 cdev->private->cmb_wait = NULL; 252 ret = set_data.ret; 253out: 254 spin_unlock_irq(cdev->ccwlock); 255 return ret; 256} 257 258void retry_set_schib(struct ccw_device *cdev) 259{ 260 struct set_schib_struct *set_data = cdev->private->cmb_wait; 261 262 if (!set_data) 263 return; 264 265 set_data->ret = set_schib(cdev, set_data->mme, set_data->mbfc, 266 set_data->address); 267 wake_up(&set_data->wait); 268} 269 270static int cmf_copy_block(struct ccw_device *cdev) 271{ 272 struct subchannel *sch = to_subchannel(cdev->dev.parent); 273 struct cmb_data *cmb_data; 274 void *hw_block; 275 276 if (cio_update_schib(sch)) 277 return -ENODEV; 278 279 if (scsw_fctl(&sch->schib.scsw) & SCSW_FCTL_START_FUNC) { 280 /* Don't copy if a start function is in progress. */ 281 if ((!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_SUSPENDED)) && 282 (scsw_actl(&sch->schib.scsw) & 283 (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) && 284 (!(scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_SEC_STATUS))) 285 return -EBUSY; 286 } 287 cmb_data = cdev->private->cmb; 288 hw_block = cmb_data->hw_block; 289 memcpy(cmb_data->last_block, hw_block, cmb_data->size); 290 cmb_data->last_update = get_tod_clock(); 291 return 0; 292} 293 294struct copy_block_struct { 295 wait_queue_head_t wait; 296 int ret; 297}; 298 299static int cmf_cmb_copy_wait(struct ccw_device *cdev) 300{ 301 struct copy_block_struct copy_block; 302 int ret = -ENODEV; 303 304 spin_lock_irq(cdev->ccwlock); 305 if (!cdev->private->cmb) 306 goto out; 307 308 ret = cmf_copy_block(cdev); 309 if (ret != -EBUSY) 310 goto out; 311 312 if (cdev->private->state != DEV_STATE_ONLINE) 313 goto out; 314 315 init_waitqueue_head(©_block.wait); 316 copy_block.ret = CMF_PENDING; 317 318 cdev->private->state = DEV_STATE_CMFUPDATE; 319 cdev->private->cmb_wait = ©_block; 320 spin_unlock_irq(cdev->ccwlock); 321 322 ret = wait_event_interruptible(copy_block.wait, 323 copy_block.ret != CMF_PENDING); 324 spin_lock_irq(cdev->ccwlock); 325 if (ret) { 326 if (copy_block.ret == CMF_PENDING) { 327 copy_block.ret = -ERESTARTSYS; 328 if (cdev->private->state == DEV_STATE_CMFUPDATE) 329 cdev->private->state = DEV_STATE_ONLINE; 330 } 331 } 332 cdev->private->cmb_wait = NULL; 333 ret = copy_block.ret; 334out: 335 spin_unlock_irq(cdev->ccwlock); 336 return ret; 337} 338 339void cmf_retry_copy_block(struct ccw_device *cdev) 340{ 341 struct copy_block_struct *copy_block = cdev->private->cmb_wait; 342 343 if (!copy_block) 344 return; 345 346 copy_block->ret = cmf_copy_block(cdev); 347 wake_up(©_block->wait); 348} 349 350static void cmf_generic_reset(struct ccw_device *cdev) 351{ 352 struct cmb_data *cmb_data; 353 354 spin_lock_irq(cdev->ccwlock); 355 cmb_data = cdev->private->cmb; 356 if (cmb_data) { 357 memset(cmb_data->last_block, 0, cmb_data->size); 358 /* 359 * Need to reset hw block as well to make the hardware start 360 * from 0 again. 361 */ 362 memset(cmb_data->hw_block, 0, cmb_data->size); 363 cmb_data->last_update = 0; 364 } 365 cdev->private->cmb_start_time = get_tod_clock(); 366 spin_unlock_irq(cdev->ccwlock); 367} 368 369/** 370 * struct cmb_area - container for global cmb data 371 * 372 * @mem: pointer to CMBs (only in basic measurement mode) 373 * @list: contains a linked list of all subchannels 374 * @num_channels: number of channels to be measured 375 * @lock: protect concurrent access to @mem and @list 376 */ 377struct cmb_area { 378 struct cmb *mem; 379 struct list_head list; 380 int num_channels; 381 spinlock_t lock; 382}; 383 384static struct cmb_area cmb_area = { 385 .lock = __SPIN_LOCK_UNLOCKED(cmb_area.lock), 386 .list = LIST_HEAD_INIT(cmb_area.list), 387 .num_channels = 1024, 388}; 389 390/* ****** old style CMB handling ********/ 391 392/* 393 * Basic channel measurement blocks are allocated in one contiguous 394 * block of memory, which can not be moved as long as any channel 395 * is active. Therefore, a maximum number of subchannels needs to 396 * be defined somewhere. This is a module parameter, defaulting to 397 * a reasonable value of 1024, or 32 kb of memory. 398 * Current kernels don't allow kmalloc with more than 128kb, so the 399 * maximum is 4096. 400 */ 401 402module_param_named(maxchannels, cmb_area.num_channels, uint, 0444); 403 404/** 405 * struct cmb - basic channel measurement block 406 * @ssch_rsch_count: number of ssch and rsch 407 * @sample_count: number of samples 408 * @device_connect_time: time of device connect 409 * @function_pending_time: time of function pending 410 * @device_disconnect_time: time of device disconnect 411 * @control_unit_queuing_time: time of control unit queuing 412 * @device_active_only_time: time of device active only 413 * @reserved: unused in basic measurement mode 414 * 415 * The measurement block as used by the hardware. The fields are described 416 * further in z/Architecture Principles of Operation, chapter 17. 417 * 418 * The cmb area made up from these blocks must be a contiguous array and may 419 * not be reallocated or freed. 420 * Only one cmb area can be present in the system. 421 */ 422struct cmb { 423 u16 ssch_rsch_count; 424 u16 sample_count; 425 u32 device_connect_time; 426 u32 function_pending_time; 427 u32 device_disconnect_time; 428 u32 control_unit_queuing_time; 429 u32 device_active_only_time; 430 u32 reserved[2]; 431}; 432 433/* 434 * Insert a single device into the cmb_area list. 435 * Called with cmb_area.lock held from alloc_cmb. 436 */ 437static int alloc_cmb_single(struct ccw_device *cdev, 438 struct cmb_data *cmb_data) 439{ 440 struct cmb *cmb; 441 struct ccw_device_private *node; 442 int ret; 443 444 spin_lock_irq(cdev->ccwlock); 445 if (!list_empty(&cdev->private->cmb_list)) { 446 ret = -EBUSY; 447 goto out; 448 } 449 450 /* 451 * Find first unused cmb in cmb_area.mem. 452 * This is a little tricky: cmb_area.list 453 * remains sorted by ->cmb->hw_data pointers. 454 */ 455 cmb = cmb_area.mem; 456 list_for_each_entry(node, &cmb_area.list, cmb_list) { 457 struct cmb_data *data; 458 data = node->cmb; 459 if ((struct cmb*)data->hw_block > cmb) 460 break; 461 cmb++; 462 } 463 if (cmb - cmb_area.mem >= cmb_area.num_channels) { 464 ret = -ENOMEM; 465 goto out; 466 } 467 468 /* insert new cmb */ 469 list_add_tail(&cdev->private->cmb_list, &node->cmb_list); 470 cmb_data->hw_block = cmb; 471 cdev->private->cmb = cmb_data; 472 ret = 0; 473out: 474 spin_unlock_irq(cdev->ccwlock); 475 return ret; 476} 477 478static int alloc_cmb(struct ccw_device *cdev) 479{ 480 int ret; 481 struct cmb *mem; 482 ssize_t size; 483 struct cmb_data *cmb_data; 484 485 /* Allocate private cmb_data. */ 486 cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL); 487 if (!cmb_data) 488 return -ENOMEM; 489 490 cmb_data->last_block = kzalloc(sizeof(struct cmb), GFP_KERNEL); 491 if (!cmb_data->last_block) { 492 kfree(cmb_data); 493 return -ENOMEM; 494 } 495 cmb_data->size = sizeof(struct cmb); 496 spin_lock(&cmb_area.lock); 497 498 if (!cmb_area.mem) { 499 /* there is no user yet, so we need a new area */ 500 size = sizeof(struct cmb) * cmb_area.num_channels; 501 WARN_ON(!list_empty(&cmb_area.list)); 502 503 spin_unlock(&cmb_area.lock); 504 mem = (void*)__get_free_pages(GFP_KERNEL | GFP_DMA, 505 get_order(size)); 506 spin_lock(&cmb_area.lock); 507 508 if (cmb_area.mem) { 509 /* ok, another thread was faster */ 510 free_pages((unsigned long)mem, get_order(size)); 511 } else if (!mem) { 512 /* no luck */ 513 ret = -ENOMEM; 514 goto out; 515 } else { 516 /* everything ok */ 517 memset(mem, 0, size); 518 cmb_area.mem = mem; 519 cmf_activate(cmb_area.mem, CMF_ON); 520 } 521 } 522 523 /* do the actual allocation */ 524 ret = alloc_cmb_single(cdev, cmb_data); 525out: 526 spin_unlock(&cmb_area.lock); 527 if (ret) { 528 kfree(cmb_data->last_block); 529 kfree(cmb_data); 530 } 531 return ret; 532} 533 534static void free_cmb(struct ccw_device *cdev) 535{ 536 struct ccw_device_private *priv; 537 struct cmb_data *cmb_data; 538 539 spin_lock(&cmb_area.lock); 540 spin_lock_irq(cdev->ccwlock); 541 542 priv = cdev->private; 543 cmb_data = priv->cmb; 544 priv->cmb = NULL; 545 if (cmb_data) 546 kfree(cmb_data->last_block); 547 kfree(cmb_data); 548 list_del_init(&priv->cmb_list); 549 550 if (list_empty(&cmb_area.list)) { 551 ssize_t size; 552 size = sizeof(struct cmb) * cmb_area.num_channels; 553 cmf_activate(NULL, CMF_OFF); 554 free_pages((unsigned long)cmb_area.mem, get_order(size)); 555 cmb_area.mem = NULL; 556 } 557 spin_unlock_irq(cdev->ccwlock); 558 spin_unlock(&cmb_area.lock); 559} 560 561static int set_cmb(struct ccw_device *cdev, u32 mme) 562{ 563 u16 offset; 564 struct cmb_data *cmb_data; 565 unsigned long flags; 566 567 spin_lock_irqsave(cdev->ccwlock, flags); 568 if (!cdev->private->cmb) { 569 spin_unlock_irqrestore(cdev->ccwlock, flags); 570 return -EINVAL; 571 } 572 cmb_data = cdev->private->cmb; 573 offset = mme ? (struct cmb *)cmb_data->hw_block - cmb_area.mem : 0; 574 spin_unlock_irqrestore(cdev->ccwlock, flags); 575 576 return set_schib_wait(cdev, mme, 0, offset); 577} 578 579/* calculate utilization in 0.1 percent units */ 580static u64 __cmb_utilization(u64 device_connect_time, u64 function_pending_time, 581 u64 device_disconnect_time, u64 start_time) 582{ 583 u64 utilization, elapsed_time; 584 585 utilization = time_to_nsec(device_connect_time + 586 function_pending_time + 587 device_disconnect_time); 588 589 elapsed_time = get_tod_clock() - start_time; 590 elapsed_time = tod_to_ns(elapsed_time); 591 elapsed_time /= 1000; 592 593 return elapsed_time ? (utilization / elapsed_time) : 0; 594} 595 596static u64 read_cmb(struct ccw_device *cdev, int index) 597{ 598 struct cmb_data *cmb_data; 599 unsigned long flags; 600 struct cmb *cmb; 601 u64 ret = 0; 602 u32 val; 603 604 spin_lock_irqsave(cdev->ccwlock, flags); 605 cmb_data = cdev->private->cmb; 606 if (!cmb_data) 607 goto out; 608 609 cmb = cmb_data->hw_block; 610 switch (index) { 611 case avg_utilization: 612 ret = __cmb_utilization(cmb->device_connect_time, 613 cmb->function_pending_time, 614 cmb->device_disconnect_time, 615 cdev->private->cmb_start_time); 616 goto out; 617 case cmb_ssch_rsch_count: 618 ret = cmb->ssch_rsch_count; 619 goto out; 620 case cmb_sample_count: 621 ret = cmb->sample_count; 622 goto out; 623 case cmb_device_connect_time: 624 val = cmb->device_connect_time; 625 break; 626 case cmb_function_pending_time: 627 val = cmb->function_pending_time; 628 break; 629 case cmb_device_disconnect_time: 630 val = cmb->device_disconnect_time; 631 break; 632 case cmb_control_unit_queuing_time: 633 val = cmb->control_unit_queuing_time; 634 break; 635 case cmb_device_active_only_time: 636 val = cmb->device_active_only_time; 637 break; 638 default: 639 goto out; 640 } 641 ret = time_to_avg_nsec(val, cmb->sample_count); 642out: 643 spin_unlock_irqrestore(cdev->ccwlock, flags); 644 return ret; 645} 646 647static int readall_cmb(struct ccw_device *cdev, struct cmbdata *data) 648{ 649 struct cmb *cmb; 650 struct cmb_data *cmb_data; 651 u64 time; 652 unsigned long flags; 653 int ret; 654 655 ret = cmf_cmb_copy_wait(cdev); 656 if (ret < 0) 657 return ret; 658 spin_lock_irqsave(cdev->ccwlock, flags); 659 cmb_data = cdev->private->cmb; 660 if (!cmb_data) { 661 ret = -ENODEV; 662 goto out; 663 } 664 if (cmb_data->last_update == 0) { 665 ret = -EAGAIN; 666 goto out; 667 } 668 cmb = cmb_data->last_block; 669 time = cmb_data->last_update - cdev->private->cmb_start_time; 670 671 memset(data, 0, sizeof(struct cmbdata)); 672 673 /* we only know values before device_busy_time */ 674 data->size = offsetof(struct cmbdata, device_busy_time); 675 676 data->elapsed_time = tod_to_ns(time); 677 678 /* copy data to new structure */ 679 data->ssch_rsch_count = cmb->ssch_rsch_count; 680 data->sample_count = cmb->sample_count; 681 682 /* time fields are converted to nanoseconds while copying */ 683 data->device_connect_time = time_to_nsec(cmb->device_connect_time); 684 data->function_pending_time = time_to_nsec(cmb->function_pending_time); 685 data->device_disconnect_time = 686 time_to_nsec(cmb->device_disconnect_time); 687 data->control_unit_queuing_time 688 = time_to_nsec(cmb->control_unit_queuing_time); 689 data->device_active_only_time 690 = time_to_nsec(cmb->device_active_only_time); 691 ret = 0; 692out: 693 spin_unlock_irqrestore(cdev->ccwlock, flags); 694 return ret; 695} 696 697static void reset_cmb(struct ccw_device *cdev) 698{ 699 cmf_generic_reset(cdev); 700} 701 702static int cmf_enabled(struct ccw_device *cdev) 703{ 704 int enabled; 705 706 spin_lock_irq(cdev->ccwlock); 707 enabled = !!cdev->private->cmb; 708 spin_unlock_irq(cdev->ccwlock); 709 710 return enabled; 711} 712 713static struct attribute_group cmf_attr_group; 714 715static struct cmb_operations cmbops_basic = { 716 .alloc = alloc_cmb, 717 .free = free_cmb, 718 .set = set_cmb, 719 .read = read_cmb, 720 .readall = readall_cmb, 721 .reset = reset_cmb, 722 .attr_group = &cmf_attr_group, 723}; 724 725/* ******** extended cmb handling ********/ 726 727/** 728 * struct cmbe - extended channel measurement block 729 * @ssch_rsch_count: number of ssch and rsch 730 * @sample_count: number of samples 731 * @device_connect_time: time of device connect 732 * @function_pending_time: time of function pending 733 * @device_disconnect_time: time of device disconnect 734 * @control_unit_queuing_time: time of control unit queuing 735 * @device_active_only_time: time of device active only 736 * @device_busy_time: time of device busy 737 * @initial_command_response_time: initial command response time 738 * @reserved: unused 739 * 740 * The measurement block as used by the hardware. May be in any 64 bit physical 741 * location. 742 * The fields are described further in z/Architecture Principles of Operation, 743 * third edition, chapter 17. 744 */ 745struct cmbe { 746 u32 ssch_rsch_count; 747 u32 sample_count; 748 u32 device_connect_time; 749 u32 function_pending_time; 750 u32 device_disconnect_time; 751 u32 control_unit_queuing_time; 752 u32 device_active_only_time; 753 u32 device_busy_time; 754 u32 initial_command_response_time; 755 u32 reserved[7]; 756} __packed __aligned(64); 757 758static struct kmem_cache *cmbe_cache; 759 760static int alloc_cmbe(struct ccw_device *cdev) 761{ 762 struct cmb_data *cmb_data; 763 struct cmbe *cmbe; 764 int ret = -ENOMEM; 765 766 cmbe = kmem_cache_zalloc(cmbe_cache, GFP_KERNEL); 767 if (!cmbe) 768 return ret; 769 770 cmb_data = kzalloc(sizeof(*cmb_data), GFP_KERNEL); 771 if (!cmb_data) 772 goto out_free; 773 774 cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL); 775 if (!cmb_data->last_block) 776 goto out_free; 777 778 cmb_data->size = sizeof(*cmbe); 779 cmb_data->hw_block = cmbe; 780 781 spin_lock(&cmb_area.lock); 782 spin_lock_irq(cdev->ccwlock); 783 if (cdev->private->cmb) 784 goto out_unlock; 785 786 cdev->private->cmb = cmb_data; 787 788 /* activate global measurement if this is the first channel */ 789 if (list_empty(&cmb_area.list)) 790 cmf_activate(NULL, CMF_ON); 791 list_add_tail(&cdev->private->cmb_list, &cmb_area.list); 792 793 spin_unlock_irq(cdev->ccwlock); 794 spin_unlock(&cmb_area.lock); 795 return 0; 796 797out_unlock: 798 spin_unlock_irq(cdev->ccwlock); 799 spin_unlock(&cmb_area.lock); 800 ret = -EBUSY; 801out_free: 802 if (cmb_data) 803 kfree(cmb_data->last_block); 804 kfree(cmb_data); 805 kmem_cache_free(cmbe_cache, cmbe); 806 807 return ret; 808} 809 810static void free_cmbe(struct ccw_device *cdev) 811{ 812 struct cmb_data *cmb_data; 813 814 spin_lock(&cmb_area.lock); 815 spin_lock_irq(cdev->ccwlock); 816 cmb_data = cdev->private->cmb; 817 cdev->private->cmb = NULL; 818 if (cmb_data) { 819 kfree(cmb_data->last_block); 820 kmem_cache_free(cmbe_cache, cmb_data->hw_block); 821 } 822 kfree(cmb_data); 823 824 /* deactivate global measurement if this is the last channel */ 825 list_del_init(&cdev->private->cmb_list); 826 if (list_empty(&cmb_area.list)) 827 cmf_activate(NULL, CMF_OFF); 828 spin_unlock_irq(cdev->ccwlock); 829 spin_unlock(&cmb_area.lock); 830} 831 832static int set_cmbe(struct ccw_device *cdev, u32 mme) 833{ 834 unsigned long mba; 835 struct cmb_data *cmb_data; 836 unsigned long flags; 837 838 spin_lock_irqsave(cdev->ccwlock, flags); 839 if (!cdev->private->cmb) { 840 spin_unlock_irqrestore(cdev->ccwlock, flags); 841 return -EINVAL; 842 } 843 cmb_data = cdev->private->cmb; 844 mba = mme ? (unsigned long) cmb_data->hw_block : 0; 845 spin_unlock_irqrestore(cdev->ccwlock, flags); 846 847 return set_schib_wait(cdev, mme, 1, mba); 848} 849 850static u64 read_cmbe(struct ccw_device *cdev, int index) 851{ 852 struct cmb_data *cmb_data; 853 unsigned long flags; 854 struct cmbe *cmb; 855 u64 ret = 0; 856 u32 val; 857 858 spin_lock_irqsave(cdev->ccwlock, flags); 859 cmb_data = cdev->private->cmb; 860 if (!cmb_data) 861 goto out; 862 863 cmb = cmb_data->hw_block; 864 switch (index) { 865 case avg_utilization: 866 ret = __cmb_utilization(cmb->device_connect_time, 867 cmb->function_pending_time, 868 cmb->device_disconnect_time, 869 cdev->private->cmb_start_time); 870 goto out; 871 case cmb_ssch_rsch_count: 872 ret = cmb->ssch_rsch_count; 873 goto out; 874 case cmb_sample_count: 875 ret = cmb->sample_count; 876 goto out; 877 case cmb_device_connect_time: 878 val = cmb->device_connect_time; 879 break; 880 case cmb_function_pending_time: 881 val = cmb->function_pending_time; 882 break; 883 case cmb_device_disconnect_time: 884 val = cmb->device_disconnect_time; 885 break; 886 case cmb_control_unit_queuing_time: 887 val = cmb->control_unit_queuing_time; 888 break; 889 case cmb_device_active_only_time: 890 val = cmb->device_active_only_time; 891 break; 892 case cmb_device_busy_time: 893 val = cmb->device_busy_time; 894 break; 895 case cmb_initial_command_response_time: 896 val = cmb->initial_command_response_time; 897 break; 898 default: 899 goto out; 900 } 901 ret = time_to_avg_nsec(val, cmb->sample_count); 902out: 903 spin_unlock_irqrestore(cdev->ccwlock, flags); 904 return ret; 905} 906 907static int readall_cmbe(struct ccw_device *cdev, struct cmbdata *data) 908{ 909 struct cmbe *cmb; 910 struct cmb_data *cmb_data; 911 u64 time; 912 unsigned long flags; 913 int ret; 914 915 ret = cmf_cmb_copy_wait(cdev); 916 if (ret < 0) 917 return ret; 918 spin_lock_irqsave(cdev->ccwlock, flags); 919 cmb_data = cdev->private->cmb; 920 if (!cmb_data) { 921 ret = -ENODEV; 922 goto out; 923 } 924 if (cmb_data->last_update == 0) { 925 ret = -EAGAIN; 926 goto out; 927 } 928 time = cmb_data->last_update - cdev->private->cmb_start_time; 929 930 memset (data, 0, sizeof(struct cmbdata)); 931 932 /* we only know values before device_busy_time */ 933 data->size = offsetof(struct cmbdata, device_busy_time); 934 935 data->elapsed_time = tod_to_ns(time); 936 937 cmb = cmb_data->last_block; 938 /* copy data to new structure */ 939 data->ssch_rsch_count = cmb->ssch_rsch_count; 940 data->sample_count = cmb->sample_count; 941 942 /* time fields are converted to nanoseconds while copying */ 943 data->device_connect_time = time_to_nsec(cmb->device_connect_time); 944 data->function_pending_time = time_to_nsec(cmb->function_pending_time); 945 data->device_disconnect_time = 946 time_to_nsec(cmb->device_disconnect_time); 947 data->control_unit_queuing_time 948 = time_to_nsec(cmb->control_unit_queuing_time); 949 data->device_active_only_time 950 = time_to_nsec(cmb->device_active_only_time); 951 data->device_busy_time = time_to_nsec(cmb->device_busy_time); 952 data->initial_command_response_time 953 = time_to_nsec(cmb->initial_command_response_time); 954 955 ret = 0; 956out: 957 spin_unlock_irqrestore(cdev->ccwlock, flags); 958 return ret; 959} 960 961static void reset_cmbe(struct ccw_device *cdev) 962{ 963 cmf_generic_reset(cdev); 964} 965 966static struct attribute_group cmf_attr_group_ext; 967 968static struct cmb_operations cmbops_extended = { 969 .alloc = alloc_cmbe, 970 .free = free_cmbe, 971 .set = set_cmbe, 972 .read = read_cmbe, 973 .readall = readall_cmbe, 974 .reset = reset_cmbe, 975 .attr_group = &cmf_attr_group_ext, 976}; 977 978static ssize_t cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx) 979{ 980 return sprintf(buf, "%lld\n", 981 (unsigned long long) cmf_read(to_ccwdev(dev), idx)); 982} 983 984static ssize_t cmb_show_avg_sample_interval(struct device *dev, 985 struct device_attribute *attr, 986 char *buf) 987{ 988 struct ccw_device *cdev = to_ccwdev(dev); 989 unsigned long count; 990 long interval; 991 992 count = cmf_read(cdev, cmb_sample_count); 993 spin_lock_irq(cdev->ccwlock); 994 if (count) { 995 interval = get_tod_clock() - cdev->private->cmb_start_time; 996 interval = tod_to_ns(interval); 997 interval /= count; 998 } else 999 interval = -1; 1000 spin_unlock_irq(cdev->ccwlock); 1001 return sprintf(buf, "%ld\n", interval); 1002} 1003 1004static ssize_t cmb_show_avg_utilization(struct device *dev, 1005 struct device_attribute *attr, 1006 char *buf) 1007{ 1008 unsigned long u = cmf_read(to_ccwdev(dev), avg_utilization); 1009 1010 return sprintf(buf, "%02lu.%01lu%%\n", u / 10, u % 10); 1011} 1012 1013#define cmf_attr(name) \ 1014static ssize_t show_##name(struct device *dev, \ 1015 struct device_attribute *attr, char *buf) \ 1016{ return cmb_show_attr((dev), buf, cmb_##name); } \ 1017static DEVICE_ATTR(name, 0444, show_##name, NULL); 1018 1019#define cmf_attr_avg(name) \ 1020static ssize_t show_avg_##name(struct device *dev, \ 1021 struct device_attribute *attr, char *buf) \ 1022{ return cmb_show_attr((dev), buf, cmb_##name); } \ 1023static DEVICE_ATTR(avg_##name, 0444, show_avg_##name, NULL); 1024 1025cmf_attr(ssch_rsch_count); 1026cmf_attr(sample_count); 1027cmf_attr_avg(device_connect_time); 1028cmf_attr_avg(function_pending_time); 1029cmf_attr_avg(device_disconnect_time); 1030cmf_attr_avg(control_unit_queuing_time); 1031cmf_attr_avg(device_active_only_time); 1032cmf_attr_avg(device_busy_time); 1033cmf_attr_avg(initial_command_response_time); 1034 1035static DEVICE_ATTR(avg_sample_interval, 0444, cmb_show_avg_sample_interval, 1036 NULL); 1037static DEVICE_ATTR(avg_utilization, 0444, cmb_show_avg_utilization, NULL); 1038 1039static struct attribute *cmf_attributes[] = { 1040 &dev_attr_avg_sample_interval.attr, 1041 &dev_attr_avg_utilization.attr, 1042 &dev_attr_ssch_rsch_count.attr, 1043 &dev_attr_sample_count.attr, 1044 &dev_attr_avg_device_connect_time.attr, 1045 &dev_attr_avg_function_pending_time.attr, 1046 &dev_attr_avg_device_disconnect_time.attr, 1047 &dev_attr_avg_control_unit_queuing_time.attr, 1048 &dev_attr_avg_device_active_only_time.attr, 1049 NULL, 1050}; 1051 1052static struct attribute_group cmf_attr_group = { 1053 .name = "cmf", 1054 .attrs = cmf_attributes, 1055}; 1056 1057static struct attribute *cmf_attributes_ext[] = { 1058 &dev_attr_avg_sample_interval.attr, 1059 &dev_attr_avg_utilization.attr, 1060 &dev_attr_ssch_rsch_count.attr, 1061 &dev_attr_sample_count.attr, 1062 &dev_attr_avg_device_connect_time.attr, 1063 &dev_attr_avg_function_pending_time.attr, 1064 &dev_attr_avg_device_disconnect_time.attr, 1065 &dev_attr_avg_control_unit_queuing_time.attr, 1066 &dev_attr_avg_device_active_only_time.attr, 1067 &dev_attr_avg_device_busy_time.attr, 1068 &dev_attr_avg_initial_command_response_time.attr, 1069 NULL, 1070}; 1071 1072static struct attribute_group cmf_attr_group_ext = { 1073 .name = "cmf", 1074 .attrs = cmf_attributes_ext, 1075}; 1076 1077static ssize_t cmb_enable_show(struct device *dev, 1078 struct device_attribute *attr, 1079 char *buf) 1080{ 1081 struct ccw_device *cdev = to_ccwdev(dev); 1082 1083 return sprintf(buf, "%d\n", cmf_enabled(cdev)); 1084} 1085 1086static ssize_t cmb_enable_store(struct device *dev, 1087 struct device_attribute *attr, const char *buf, 1088 size_t c) 1089{ 1090 struct ccw_device *cdev = to_ccwdev(dev); 1091 unsigned long val; 1092 int ret; 1093 1094 ret = kstrtoul(buf, 16, &val); 1095 if (ret) 1096 return ret; 1097 1098 switch (val) { 1099 case 0: 1100 ret = disable_cmf(cdev); 1101 break; 1102 case 1: 1103 ret = enable_cmf(cdev); 1104 break; 1105 default: 1106 ret = -EINVAL; 1107 } 1108 1109 return ret ? ret : c; 1110} 1111DEVICE_ATTR_RW(cmb_enable); 1112 1113/** 1114 * enable_cmf() - switch on the channel measurement for a specific device 1115 * @cdev: The ccw device to be enabled 1116 * 1117 * Enable channel measurements for @cdev. If this is called on a device 1118 * for which channel measurement is already enabled a reset of the 1119 * measurement data is triggered. 1120 * Returns: %0 for success or a negative error value. 1121 * Context: 1122 * non-atomic 1123 */ 1124int enable_cmf(struct ccw_device *cdev) 1125{ 1126 int ret = 0; 1127 1128 device_lock(&cdev->dev); 1129 if (cmf_enabled(cdev)) { 1130 cmbops->reset(cdev); 1131 goto out_unlock; 1132 } 1133 get_device(&cdev->dev); 1134 ret = cmbops->alloc(cdev); 1135 if (ret) 1136 goto out; 1137 cmbops->reset(cdev); 1138 ret = sysfs_create_group(&cdev->dev.kobj, cmbops->attr_group); 1139 if (ret) { 1140 cmbops->free(cdev); 1141 goto out; 1142 } 1143 ret = cmbops->set(cdev, 2); 1144 if (ret) { 1145 sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group); 1146 cmbops->free(cdev); 1147 } 1148out: 1149 if (ret) 1150 put_device(&cdev->dev); 1151out_unlock: 1152 device_unlock(&cdev->dev); 1153 return ret; 1154} 1155 1156/** 1157 * __disable_cmf() - switch off the channel measurement for a specific device 1158 * @cdev: The ccw device to be disabled 1159 * 1160 * Returns: %0 for success or a negative error value. 1161 * 1162 * Context: 1163 * non-atomic, device_lock() held. 1164 */ 1165int __disable_cmf(struct ccw_device *cdev) 1166{ 1167 int ret; 1168 1169 ret = cmbops->set(cdev, 0); 1170 if (ret) 1171 return ret; 1172 1173 sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group); 1174 cmbops->free(cdev); 1175 put_device(&cdev->dev); 1176 1177 return ret; 1178} 1179 1180/** 1181 * disable_cmf() - switch off the channel measurement for a specific device 1182 * @cdev: The ccw device to be disabled 1183 * 1184 * Returns: %0 for success or a negative error value. 1185 * 1186 * Context: 1187 * non-atomic 1188 */ 1189int disable_cmf(struct ccw_device *cdev) 1190{ 1191 int ret; 1192 1193 device_lock(&cdev->dev); 1194 ret = __disable_cmf(cdev); 1195 device_unlock(&cdev->dev); 1196 1197 return ret; 1198} 1199 1200/** 1201 * cmf_read() - read one value from the current channel measurement block 1202 * @cdev: the channel to be read 1203 * @index: the index of the value to be read 1204 * 1205 * Returns: The value read or %0 if the value cannot be read. 1206 * 1207 * Context: 1208 * any 1209 */ 1210u64 cmf_read(struct ccw_device *cdev, int index) 1211{ 1212 return cmbops->read(cdev, index); 1213} 1214 1215/** 1216 * cmf_readall() - read the current channel measurement block 1217 * @cdev: the channel to be read 1218 * @data: a pointer to a data block that will be filled 1219 * 1220 * Returns: %0 on success, a negative error value otherwise. 1221 * 1222 * Context: 1223 * any 1224 */ 1225int cmf_readall(struct ccw_device *cdev, struct cmbdata *data) 1226{ 1227 return cmbops->readall(cdev, data); 1228} 1229 1230/* Reenable cmf when a disconnected device becomes available again. */ 1231int cmf_reenable(struct ccw_device *cdev) 1232{ 1233 cmbops->reset(cdev); 1234 return cmbops->set(cdev, 2); 1235} 1236 1237/** 1238 * cmf_reactivate() - reactivate measurement block updates 1239 * 1240 * Use this during resume from hibernate. 1241 */ 1242void cmf_reactivate(void) 1243{ 1244 spin_lock(&cmb_area.lock); 1245 if (!list_empty(&cmb_area.list)) 1246 cmf_activate(cmb_area.mem, CMF_ON); 1247 spin_unlock(&cmb_area.lock); 1248} 1249 1250static int __init init_cmbe(void) 1251{ 1252 cmbe_cache = kmem_cache_create("cmbe_cache", sizeof(struct cmbe), 1253 __alignof__(struct cmbe), 0, NULL); 1254 1255 return cmbe_cache ? 0 : -ENOMEM; 1256} 1257 1258static int __init init_cmf(void) 1259{ 1260 char *format_string; 1261 char *detect_string; 1262 int ret; 1263 1264 /* 1265 * If the user did not give a parameter, see if we are running on a 1266 * machine supporting extended measurement blocks, otherwise fall back 1267 * to basic mode. 1268 */ 1269 if (format == CMF_AUTODETECT) { 1270 if (!css_general_characteristics.ext_mb) { 1271 format = CMF_BASIC; 1272 } else { 1273 format = CMF_EXTENDED; 1274 } 1275 detect_string = "autodetected"; 1276 } else { 1277 detect_string = "parameter"; 1278 } 1279 1280 switch (format) { 1281 case CMF_BASIC: 1282 format_string = "basic"; 1283 cmbops = &cmbops_basic; 1284 break; 1285 case CMF_EXTENDED: 1286 format_string = "extended"; 1287 cmbops = &cmbops_extended; 1288 1289 ret = init_cmbe(); 1290 if (ret) 1291 return ret; 1292 break; 1293 default: 1294 return -EINVAL; 1295 } 1296 pr_info("Channel measurement facility initialized using format " 1297 "%s (mode %s)\n", format_string, detect_string); 1298 return 0; 1299} 1300device_initcall(init_cmf); 1301 1302EXPORT_SYMBOL_GPL(enable_cmf); 1303EXPORT_SYMBOL_GPL(disable_cmf); 1304EXPORT_SYMBOL_GPL(cmf_read); 1305EXPORT_SYMBOL_GPL(cmf_readall); 1306