ap_bus.c 45.5 KB
Newer Older
1 2 3 4 5 6 7
/*
 * linux/drivers/s390/crypto/ap_bus.c
 *
 * Copyright (C) 2006 IBM Corporation
 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
 *	      Martin Schwidefsky <schwidefsky@de.ibm.com>
 *	      Ralph Wuerthner <rwuerthn@de.ibm.com>
F
Felix Beck 已提交
8
 *	      Felix Beck <felix.beck@de.ibm.com>
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
 *
 * Adjunct processor bus.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

27 28 29
#define KMSG_COMPONENT "ap"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

30 31 32 33 34 35 36 37 38
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/notifier.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
39
#include <asm/reset.h>
F
Felix Beck 已提交
40 41 42 43
#include <asm/airq.h>
#include <asm/atomic.h>
#include <asm/system.h>
#include <asm/isc.h>
44 45
#include <linux/hrtimer.h>
#include <linux/ktime.h>
46 47 48 49

#include "ap_bus.h"

/* Some prototypes. */
50
static void ap_scan_bus(struct work_struct *);
51
static void ap_poll_all(unsigned long);
52
static enum hrtimer_restart ap_poll_timeout(struct hrtimer *);
53 54
static int ap_poll_thread_start(void);
static void ap_poll_thread_stop(void);
55
static void ap_request_timeout(unsigned long);
F
Felix Beck 已提交
56
static inline void ap_schedule_poll_timer(void);
57 58 59 60 61 62
static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags);
static int ap_device_remove(struct device *dev);
static int ap_device_probe(struct device *dev);
static void ap_interrupt_handler(void *unused1, void *unused2);
static void ap_reset(struct ap_device *ap_dev);
static void ap_config_timeout(unsigned long ptr);
63
static int ap_select_domain(void);
64

65
/*
66 67 68 69 70 71 72
 * Module description.
 */
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("Adjunct Processor Bus driver, "
		   "Copyright 2006 IBM Corporation");
MODULE_LICENSE("GPL");

73
/*
74 75 76 77 78 79 80
 * Module parameter
 */
int ap_domain_index = -1;	/* Adjunct Processor Domain Index */
module_param_named(domain, ap_domain_index, int, 0000);
MODULE_PARM_DESC(domain, "domain index for ap devices");
EXPORT_SYMBOL(ap_domain_index);

81
static int ap_thread_flag = 0;
82
module_param_named(poll_thread, ap_thread_flag, int, 0000);
83
MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
84 85

static struct device *ap_root_device = NULL;
86
static DEFINE_SPINLOCK(ap_device_list_lock);
87
static LIST_HEAD(ap_device_list);
88

89
/*
90 91 92 93 94
 * Workqueue & timer for bus rescan.
 */
static struct workqueue_struct *ap_work_queue;
static struct timer_list ap_config_timer;
static int ap_config_time = AP_CONFIG_TIME;
95
static DECLARE_WORK(ap_config_work, ap_scan_bus);
96

97
/*
F
Felix Beck 已提交
98
 * Tasklet & timer for AP request polling and interrupts
99 100 101 102 103 104
 */
static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0);
static atomic_t ap_poll_requests = ATOMIC_INIT(0);
static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
static struct task_struct *ap_poll_kthread = NULL;
static DEFINE_MUTEX(ap_poll_thread_mutex);
105
static DEFINE_SPINLOCK(ap_poll_timer_lock);
F
Felix Beck 已提交
106
static void *ap_interrupt_indicator;
107 108 109 110
static struct hrtimer ap_poll_timer;
/* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds.
 * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/
static unsigned long long poll_timeout = 250000;
111

112 113
/* Suspend flag */
static int ap_suspend_flag;
114 115 116 117
/* Flag to check if domain was set through module parameter domain=. This is
 * important when supsend and resume is done in a z/VM environment where the
 * domain might change. */
static int user_set_domain = 0;
118 119
static struct bus_type ap_bus_type;

F
Felix Beck 已提交
120 121 122 123 124 125 126 127 128
/**
 * ap_using_interrupts() - Returns non-zero if interrupt support is
 * available.
 */
static inline int ap_using_interrupts(void)
{
	return ap_interrupt_indicator != NULL;
}

129
/**
130
 * ap_intructions_available() - Test if AP instructions are available.
131
 *
132
 * Returns 0 if the AP instructions are installed.
133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148
 */
static inline int ap_instructions_available(void)
{
	register unsigned long reg0 asm ("0") = AP_MKQID(0,0);
	register unsigned long reg1 asm ("1") = -ENODEV;
	register unsigned long reg2 asm ("2") = 0UL;

	asm volatile(
		"   .long 0xb2af0000\n"		/* PQAP(TAPQ) */
		"0: la    %1,0\n"
		"1:\n"
		EX_TABLE(0b, 1b)
		: "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" );
	return reg1;
}

F
Felix Beck 已提交
149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165
/**
 * ap_interrupts_available(): Test if AP interrupts are available.
 *
 * Returns 1 if AP interrupts are available.
 */
static int ap_interrupts_available(void)
{
	unsigned long long facility_bits[2];

	if (stfle(facility_bits, 2) <= 1)
		return 0;
	if (!(facility_bits[0] & (1ULL << 61)) ||
	    !(facility_bits[1] & (1ULL << 62)))
		return 0;
	return 1;
}

166
/**
167 168 169 170
 * ap_test_queue(): Test adjunct processor queue.
 * @qid: The AP queue number
 * @queue_depth: Pointer to queue depth value
 * @device_type: Pointer to device type value
171
 *
172
 * Returns AP queue status structure.
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188
 */
static inline struct ap_queue_status
ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type)
{
	register unsigned long reg0 asm ("0") = qid;
	register struct ap_queue_status reg1 asm ("1");
	register unsigned long reg2 asm ("2") = 0UL;

	asm volatile(".long 0xb2af0000"		/* PQAP(TAPQ) */
		     : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
	*device_type = (int) (reg2 >> 24);
	*queue_depth = (int) (reg2 & 0xff);
	return reg1;
}

/**
189 190
 * ap_reset_queue(): Reset adjunct processor queue.
 * @qid: The AP queue number
191
 *
192
 * Returns AP queue status structure.
193 194 195 196 197 198 199 200 201 202 203 204 205
 */
static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid)
{
	register unsigned long reg0 asm ("0") = qid | 0x01000000UL;
	register struct ap_queue_status reg1 asm ("1");
	register unsigned long reg2 asm ("2") = 0UL;

	asm volatile(
		".long 0xb2af0000"		/* PQAP(RAPQ) */
		: "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
	return reg1;
}

F
Felix Beck 已提交
206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279
#ifdef CONFIG_64BIT
/**
 * ap_queue_interruption_control(): Enable interruption for a specific AP.
 * @qid: The AP queue number
 * @ind: The notification indicator byte
 *
 * Returns AP queue status.
 */
static inline struct ap_queue_status
ap_queue_interruption_control(ap_qid_t qid, void *ind)
{
	register unsigned long reg0 asm ("0") = qid | 0x03000000UL;
	register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC;
	register struct ap_queue_status reg1_out asm ("1");
	register void *reg2 asm ("2") = ind;
	asm volatile(
		".long 0xb2af0000"		/* PQAP(RAPQ) */
		: "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2)
		:
		: "cc" );
	return reg1_out;
}
#endif

/**
 * ap_queue_enable_interruption(): Enable interruption on an AP.
 * @qid: The AP queue number
 * @ind: the notification indicator byte
 *
 * Enables interruption on AP queue via ap_queue_interruption_control(). Based
 * on the return value it waits a while and tests the AP queue if interrupts
 * have been switched on using ap_test_queue().
 */
static int ap_queue_enable_interruption(ap_qid_t qid, void *ind)
{
#ifdef CONFIG_64BIT
	struct ap_queue_status status;
	int t_depth, t_device_type, rc, i;

	rc = -EBUSY;
	status = ap_queue_interruption_control(qid, ind);

	for (i = 0; i < AP_MAX_RESET; i++) {
		switch (status.response_code) {
		case AP_RESPONSE_NORMAL:
			if (status.int_enabled)
				return 0;
			break;
		case AP_RESPONSE_RESET_IN_PROGRESS:
		case AP_RESPONSE_BUSY:
			break;
		case AP_RESPONSE_Q_NOT_AVAIL:
		case AP_RESPONSE_DECONFIGURED:
		case AP_RESPONSE_CHECKSTOPPED:
		case AP_RESPONSE_INVALID_ADDRESS:
			return -ENODEV;
		case AP_RESPONSE_OTHERWISE_CHANGED:
			if (status.int_enabled)
				return 0;
			break;
		default:
			break;
		}
		if (i < AP_MAX_RESET - 1) {
			udelay(5);
			status = ap_test_queue(qid, &t_depth, &t_device_type);
		}
	}
	return rc;
#else
	return -EINVAL;
#endif
}

280
/**
281 282 283 284 285
 * __ap_send(): Send message to adjunct processor queue.
 * @qid: The AP queue number
 * @psmid: The program supplied message identifier
 * @msg: The message text
 * @length: The message length
286
 * @special: Special Bit
287
 *
288
 * Returns AP queue status structure.
289 290 291 292 293
 * Condition code 1 on NQAP can't happen because the L bit is 1.
 * Condition code 2 on NQAP also means the send is incomplete,
 * because a segment boundary was reached. The NQAP is repeated.
 */
static inline struct ap_queue_status
294 295
__ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length,
	  unsigned int special)
296 297 298 299 300 301 302 303 304
{
	typedef struct { char _[length]; } msgblock;
	register unsigned long reg0 asm ("0") = qid | 0x40000000UL;
	register struct ap_queue_status reg1 asm ("1");
	register unsigned long reg2 asm ("2") = (unsigned long) msg;
	register unsigned long reg3 asm ("3") = (unsigned long) length;
	register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32);
	register unsigned long reg5 asm ("5") = (unsigned int) psmid;

305 306 307
	if (special == 1)
		reg0 |= 0x400000UL;

308 309 310 311 312 313 314 315 316 317 318 319 320
	asm volatile (
		"0: .long 0xb2ad0042\n"		/* DQAP */
		"   brc   2,0b"
		: "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3)
		: "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg)
		: "cc" );
	return reg1;
}

int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length)
{
	struct ap_queue_status status;

321
	status = __ap_send(qid, psmid, msg, length, 0);
322 323 324 325
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		return 0;
	case AP_RESPONSE_Q_FULL:
326
	case AP_RESPONSE_RESET_IN_PROGRESS:
327
		return -EBUSY;
328 329
	case AP_RESPONSE_REQ_FAC_NOT_INST:
		return -EINVAL;
330 331 332 333 334 335
	default:	/* Device is gone. */
		return -ENODEV;
	}
}
EXPORT_SYMBOL(ap_send);

336 337 338 339 340 341
/**
 * __ap_recv(): Receive message from adjunct processor queue.
 * @qid: The AP queue number
 * @psmid: Pointer to program supplied message identifier
 * @msg: The message text
 * @length: The message length
342
 *
343
 * Returns AP queue status structure.
344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388
 * Condition code 1 on DQAP means the receive has taken place
 * but only partially.	The response is incomplete, hence the
 * DQAP is repeated.
 * Condition code 2 on DQAP also means the receive is incomplete,
 * this time because a segment boundary was reached. Again, the
 * DQAP is repeated.
 * Note that gpr2 is used by the DQAP instruction to keep track of
 * any 'residual' length, in case the instruction gets interrupted.
 * Hence it gets zeroed before the instruction.
 */
static inline struct ap_queue_status
__ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
{
	typedef struct { char _[length]; } msgblock;
	register unsigned long reg0 asm("0") = qid | 0x80000000UL;
	register struct ap_queue_status reg1 asm ("1");
	register unsigned long reg2 asm("2") = 0UL;
	register unsigned long reg4 asm("4") = (unsigned long) msg;
	register unsigned long reg5 asm("5") = (unsigned long) length;
	register unsigned long reg6 asm("6") = 0UL;
	register unsigned long reg7 asm("7") = 0UL;


	asm volatile(
		"0: .long 0xb2ae0064\n"
		"   brc   6,0b\n"
		: "+d" (reg0), "=d" (reg1), "+d" (reg2),
		"+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7),
		"=m" (*(msgblock *) msg) : : "cc" );
	*psmid = (((unsigned long long) reg6) << 32) + reg7;
	return reg1;
}

int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
{
	struct ap_queue_status status;

	status = __ap_recv(qid, psmid, msg, length);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		return 0;
	case AP_RESPONSE_NO_PENDING_REPLY:
		if (status.queue_empty)
			return -ENOENT;
		return -EBUSY;
389 390
	case AP_RESPONSE_RESET_IN_PROGRESS:
		return -EBUSY;
391 392 393 394 395 396 397
	default:
		return -ENODEV;
	}
}
EXPORT_SYMBOL(ap_recv);

/**
398 399 400 401 402 403
 * ap_query_queue(): Check if an AP queue is available.
 * @qid: The AP queue number
 * @queue_depth: Pointer to queue depth value
 * @device_type: Pointer to device type value
 *
 * The test is repeated for AP_MAX_RESET times.
404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429
 */
static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type)
{
	struct ap_queue_status status;
	int t_depth, t_device_type, rc, i;

	rc = -EBUSY;
	for (i = 0; i < AP_MAX_RESET; i++) {
		status = ap_test_queue(qid, &t_depth, &t_device_type);
		switch (status.response_code) {
		case AP_RESPONSE_NORMAL:
			*queue_depth = t_depth + 1;
			*device_type = t_device_type;
			rc = 0;
			break;
		case AP_RESPONSE_Q_NOT_AVAIL:
			rc = -ENODEV;
			break;
		case AP_RESPONSE_RESET_IN_PROGRESS:
			break;
		case AP_RESPONSE_DECONFIGURED:
			rc = -ENODEV;
			break;
		case AP_RESPONSE_CHECKSTOPPED:
			rc = -ENODEV;
			break;
F
Felix Beck 已提交
430 431 432 433 434
		case AP_RESPONSE_INVALID_ADDRESS:
			rc = -ENODEV;
			break;
		case AP_RESPONSE_OTHERWISE_CHANGED:
			break;
435 436 437 438 439 440 441 442 443 444 445 446 447 448
		case AP_RESPONSE_BUSY:
			break;
		default:
			BUG();
		}
		if (rc != -EBUSY)
			break;
		if (i < AP_MAX_RESET - 1)
			udelay(5);
	}
	return rc;
}

/**
449 450 451
 * ap_init_queue(): Reset an AP queue.
 * @qid: The AP queue number
 *
452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472
 * Reset an AP queue and wait for it to become available again.
 */
static int ap_init_queue(ap_qid_t qid)
{
	struct ap_queue_status status;
	int rc, dummy, i;

	rc = -ENODEV;
	status = ap_reset_queue(qid);
	for (i = 0; i < AP_MAX_RESET; i++) {
		switch (status.response_code) {
		case AP_RESPONSE_NORMAL:
			if (status.queue_empty)
				rc = 0;
			break;
		case AP_RESPONSE_Q_NOT_AVAIL:
		case AP_RESPONSE_DECONFIGURED:
		case AP_RESPONSE_CHECKSTOPPED:
			i = AP_MAX_RESET;	/* return with -ENODEV */
			break;
		case AP_RESPONSE_RESET_IN_PROGRESS:
473
			rc = -EBUSY;
474 475 476 477
		case AP_RESPONSE_BUSY:
		default:
			break;
		}
478
		if (rc != -ENODEV && rc != -EBUSY)
479 480 481 482 483 484
			break;
		if (i < AP_MAX_RESET - 1) {
			udelay(5);
			status = ap_test_queue(qid, &dummy, &dummy);
		}
	}
F
Felix Beck 已提交
485 486 487 488 489 490 491 492 493
	if (rc == 0 && ap_using_interrupts()) {
		rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator);
		/* If interruption mode is supported by the machine,
		* but an AP can not be enabled for interruption then
		* the AP will be discarded.    */
		if (rc)
			pr_err("Registering adapter interrupts for "
			       "AP %d failed\n", AP_QID_DEVICE(qid));
	}
494 495 496
	return rc;
}

497
/**
498 499 500 501
 * ap_increase_queue_count(): Arm request timeout.
 * @ap_dev: Pointer to an AP device.
 *
 * Arm request timeout if an AP device was idle and a new request is submitted.
502 503 504 505 506 507 508 509 510 511 512 513 514
 */
static void ap_increase_queue_count(struct ap_device *ap_dev)
{
	int timeout = ap_dev->drv->request_timeout;

	ap_dev->queue_count++;
	if (ap_dev->queue_count == 1) {
		mod_timer(&ap_dev->timeout, jiffies + timeout);
		ap_dev->reset = AP_RESET_ARMED;
	}
}

/**
515 516 517 518
 * ap_decrease_queue_count(): Decrease queue count.
 * @ap_dev: Pointer to an AP device.
 *
 * If AP device is still alive, re-schedule request timeout if there are still
519 520 521 522 523 524 525 526 527 528
 * pending requests.
 */
static void ap_decrease_queue_count(struct ap_device *ap_dev)
{
	int timeout = ap_dev->drv->request_timeout;

	ap_dev->queue_count--;
	if (ap_dev->queue_count > 0)
		mod_timer(&ap_dev->timeout, jiffies + timeout);
	else
529
		/*
530 531 532 533 534 535 536
		 * The timeout timer should to be disabled now - since
		 * del_timer_sync() is very expensive, we just tell via the
		 * reset flag to ignore the pending timeout timer.
		 */
		ap_dev->reset = AP_RESET_IGNORE;
}

537
/*
538 539 540 541 542 543 544 545 546
 * AP device related attributes.
 */
static ssize_t ap_hwtype_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct ap_device *ap_dev = to_ap_dev(dev);
	return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type);
}

547
static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL);
548 549 550 551 552 553 554
static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct ap_device *ap_dev = to_ap_dev(dev);
	return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth);
}

555
static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL);
556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590
static ssize_t ap_request_count_show(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct ap_device *ap_dev = to_ap_dev(dev);
	int rc;

	spin_lock_bh(&ap_dev->lock);
	rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count);
	spin_unlock_bh(&ap_dev->lock);
	return rc;
}

static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL);

static ssize_t ap_modalias_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type);
}

static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL);

static struct attribute *ap_dev_attrs[] = {
	&dev_attr_hwtype.attr,
	&dev_attr_depth.attr,
	&dev_attr_request_count.attr,
	&dev_attr_modalias.attr,
	NULL
};
static struct attribute_group ap_dev_attr_group = {
	.attrs = ap_dev_attrs
};

/**
591 592 593 594
 * ap_bus_match()
 * @dev: Pointer to device
 * @drv: Pointer to device_driver
 *
595 596 597 598 599 600 601 602
 * AP bus driver registration/unregistration.
 */
static int ap_bus_match(struct device *dev, struct device_driver *drv)
{
	struct ap_device *ap_dev = to_ap_dev(dev);
	struct ap_driver *ap_drv = to_ap_drv(drv);
	struct ap_device_id *id;

603
	/*
604 605 606 607 608 609 610 611 612 613 614 615 616
	 * Compare device type of the device with the list of
	 * supported types of the device_driver.
	 */
	for (id = ap_drv->ids; id->match_flags; id++) {
		if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) &&
		    (id->dev_type != ap_dev->device_type))
			continue;
		return 1;
	}
	return 0;
}

/**
617 618 619 620 621 622
 * ap_uevent(): Uevent function for AP devices.
 * @dev: Pointer to device
 * @env: Pointer to kobj_uevent_env
 *
 * It sets up a single environment variable DEV_TYPE which contains the
 * hardware device type.
623
 */
624
static int ap_uevent (struct device *dev, struct kobj_uevent_env *env)
625 626
{
	struct ap_device *ap_dev = to_ap_dev(dev);
627
	int retval = 0;
628 629 630 631 632

	if (!ap_dev)
		return -ENODEV;

	/* Set up DEV_TYPE environment variable. */
633
	retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type);
634 635 636
	if (retval)
		return retval;

637
	/* Add MODALIAS= */
638
	retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type);
639 640

	return retval;
641 642
}

643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658
static int ap_bus_suspend(struct device *dev, pm_message_t state)
{
	struct ap_device *ap_dev = to_ap_dev(dev);
	unsigned long flags;

	if (!ap_suspend_flag) {
		ap_suspend_flag = 1;

		/* Disable scanning for devices, thus we do not want to scan
		 * for them after removing.
		 */
		del_timer_sync(&ap_config_timer);
		if (ap_work_queue != NULL) {
			destroy_workqueue(ap_work_queue);
			ap_work_queue = NULL;
		}
659

660 661 662 663 664
		tasklet_disable(&ap_tasklet);
	}
	/* Poll on the device until all requests are finished. */
	do {
		flags = 0;
665
		spin_lock_bh(&ap_dev->lock);
666
		__ap_poll_device(ap_dev, &flags);
667
		spin_unlock_bh(&ap_dev->lock);
668 669
	} while ((flags & 1) || (flags & 2));

670 671 672 673
	spin_lock_bh(&ap_dev->lock);
	ap_dev->unregistered = 1;
	spin_unlock_bh(&ap_dev->lock);

674 675 676 677 678 679 680 681 682 683 684 685
	return 0;
}

static int ap_bus_resume(struct device *dev)
{
	int rc = 0;
	struct ap_device *ap_dev = to_ap_dev(dev);

	if (ap_suspend_flag) {
		ap_suspend_flag = 0;
		if (!ap_interrupts_available())
			ap_interrupt_indicator = NULL;
686 687 688 689
		if (!user_set_domain) {
			ap_domain_index = -1;
			ap_select_domain();
		}
690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705
		init_timer(&ap_config_timer);
		ap_config_timer.function = ap_config_timeout;
		ap_config_timer.data = 0;
		ap_config_timer.expires = jiffies + ap_config_time * HZ;
		add_timer(&ap_config_timer);
		ap_work_queue = create_singlethread_workqueue("kapwork");
		if (!ap_work_queue)
			return -ENOMEM;
		tasklet_enable(&ap_tasklet);
		if (!ap_using_interrupts())
			ap_schedule_poll_timer();
		else
			tasklet_schedule(&ap_tasklet);
		if (ap_thread_flag)
			rc = ap_poll_thread_start();
	}
706 707 708 709 710 711 712
	if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) {
		spin_lock_bh(&ap_dev->lock);
		ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid),
				       ap_domain_index);
		spin_unlock_bh(&ap_dev->lock);
	}
	queue_work(ap_work_queue, &ap_config_work);
713 714 715 716

	return rc;
}

717 718 719 720
static struct bus_type ap_bus_type = {
	.name = "ap",
	.match = &ap_bus_match,
	.uevent = &ap_uevent,
721 722
	.suspend = ap_bus_suspend,
	.resume = ap_bus_resume
723 724 725 726 727 728 729 730 731 732
};

static int ap_device_probe(struct device *dev)
{
	struct ap_device *ap_dev = to_ap_dev(dev);
	struct ap_driver *ap_drv = to_ap_drv(dev->driver);
	int rc;

	ap_dev->drv = ap_drv;
	rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
733
	if (!rc) {
734
		spin_lock_bh(&ap_device_list_lock);
735
		list_add(&ap_dev->list, &ap_device_list);
736
		spin_unlock_bh(&ap_device_list_lock);
737
	}
738 739 740 741
	return rc;
}

/**
742 743 744
 * __ap_flush_queue(): Flush requests.
 * @ap_dev: Pointer to the AP device
 *
745 746
 * Flush all requests from the request/pending queue of an AP device.
 */
747
static void __ap_flush_queue(struct ap_device *ap_dev)
748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775
{
	struct ap_message *ap_msg, *next;

	list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) {
		list_del_init(&ap_msg->list);
		ap_dev->pendingq_count--;
		ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
	}
	list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) {
		list_del_init(&ap_msg->list);
		ap_dev->requestq_count--;
		ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
	}
}

void ap_flush_queue(struct ap_device *ap_dev)
{
	spin_lock_bh(&ap_dev->lock);
	__ap_flush_queue(ap_dev);
	spin_unlock_bh(&ap_dev->lock);
}
EXPORT_SYMBOL(ap_flush_queue);

static int ap_device_remove(struct device *dev)
{
	struct ap_device *ap_dev = to_ap_dev(dev);
	struct ap_driver *ap_drv = ap_dev->drv;

776
	ap_flush_queue(ap_dev);
777
	del_timer_sync(&ap_dev->timeout);
778
	spin_lock_bh(&ap_device_list_lock);
779
	list_del_init(&ap_dev->list);
780
	spin_unlock_bh(&ap_device_list_lock);
781 782
	if (ap_drv->remove)
		ap_drv->remove(ap_dev);
783 784 785
	spin_lock_bh(&ap_dev->lock);
	atomic_sub(ap_dev->queue_count, &ap_poll_requests);
	spin_unlock_bh(&ap_dev->lock);
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808
	return 0;
}

int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
		       char *name)
{
	struct device_driver *drv = &ap_drv->driver;

	drv->bus = &ap_bus_type;
	drv->probe = ap_device_probe;
	drv->remove = ap_device_remove;
	drv->owner = owner;
	drv->name = name;
	return driver_register(drv);
}
EXPORT_SYMBOL(ap_driver_register);

void ap_driver_unregister(struct ap_driver *ap_drv)
{
	driver_unregister(&ap_drv->driver);
}
EXPORT_SYMBOL(ap_driver_unregister);

809
/*
810 811 812 813 814 815 816 817 818 819 820 821 822 823
 * AP bus attributes.
 */
static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
}

static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL);

static ssize_t ap_config_time_show(struct bus_type *bus, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
}

F
Felix Beck 已提交
824 825 826 827 828 829 830 831
static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n",
			ap_using_interrupts() ? 1 : 0);
}

static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL);

832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873
static ssize_t ap_config_time_store(struct bus_type *bus,
				    const char *buf, size_t count)
{
	int time;

	if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120)
		return -EINVAL;
	ap_config_time = time;
	if (!timer_pending(&ap_config_timer) ||
	    !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) {
		ap_config_timer.expires = jiffies + ap_config_time * HZ;
		add_timer(&ap_config_timer);
	}
	return count;
}

static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store);

static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
}

static ssize_t ap_poll_thread_store(struct bus_type *bus,
				    const char *buf, size_t count)
{
	int flag, rc;

	if (sscanf(buf, "%d\n", &flag) != 1)
		return -EINVAL;
	if (flag) {
		rc = ap_poll_thread_start();
		if (rc)
			return rc;
	}
	else
		ap_poll_thread_stop();
	return count;
}

static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store);

874 875 876 877 878 879 880 881 882 883 884 885
static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
}

static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
				  size_t count)
{
	unsigned long long time;
	ktime_t hr_time;

	/* 120 seconds = maximum poll interval */
F
Felix Beck 已提交
886 887
	if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 ||
	    time > 120000000000ULL)
888 889 890 891 892
		return -EINVAL;
	poll_timeout = time;
	hr_time = ktime_set(0, poll_timeout);

	if (!hrtimer_is_queued(&ap_poll_timer) ||
893 894 895
	    !hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) {
		hrtimer_set_expires(&ap_poll_timer, hr_time);
		hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
896 897 898 899 900 901
	}
	return count;
}

static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store);

902 903 904 905
static struct bus_attribute *const ap_bus_attrs[] = {
	&bus_attr_ap_domain,
	&bus_attr_config_time,
	&bus_attr_poll_thread,
F
Felix Beck 已提交
906
	&bus_attr_ap_interrupts,
907 908
	&bus_attr_poll_timeout,
	NULL,
909 910 911
};

/**
912 913 914
 * ap_select_domain(): Select an AP domain.
 *
 * Pick one of the 16 AP domains.
915
 */
916
static int ap_select_domain(void)
917 918 919 920
{
	int queue_depth, device_type, count, max_count, best_domain;
	int rc, i, j;

921
	/*
922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
	 * We want to use a single domain. Either the one specified with
	 * the "domain=" parameter or the domain with the maximum number
	 * of devices.
	 */
	if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS)
		/* Domain has already been selected. */
		return 0;
	best_domain = -1;
	max_count = 0;
	for (i = 0; i < AP_DOMAINS; i++) {
		count = 0;
		for (j = 0; j < AP_DEVICES; j++) {
			ap_qid_t qid = AP_MKQID(j, i);
			rc = ap_query_queue(qid, &queue_depth, &device_type);
			if (rc)
				continue;
			count++;
		}
		if (count > max_count) {
			max_count = count;
			best_domain = i;
		}
	}
	if (best_domain >= 0){
		ap_domain_index = best_domain;
		return 0;
	}
	return -ENODEV;
}

/**
953
 * ap_probe_device_type(): Find the device type of an AP.
954
 * @ap_dev: pointer to the AP device.
955 956
 *
 * Find the device type if query queue returned a device type of 0.
957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
 */
static int ap_probe_device_type(struct ap_device *ap_dev)
{
	static unsigned char msg[] = {
		0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50,
		0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01,
		0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00,
		0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00,
		0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20,
		0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53,
		0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22,
		0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00,
		0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,
		0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66,
		0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44,
		0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22,
		0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00,
		0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77,
		0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00,
		0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00,
		0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01,
		0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c,
		0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68,
		0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66,
		0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0,
		0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8,
		0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04,
		0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57,
		0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d,
	};
	struct ap_queue_status status;
	unsigned long long psmid;
	char *reply;
	int rc, i;

	reply = (void *) get_zeroed_page(GFP_KERNEL);
	if (!reply) {
		rc = -ENOMEM;
		goto out;
	}

	status = __ap_send(ap_dev->qid, 0x0102030405060708ULL,
1019
			   msg, sizeof(msg), 0);
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
	if (status.response_code != AP_RESPONSE_NORMAL) {
		rc = -ENODEV;
		goto out_free;
	}

	/* Wait for the test message to complete. */
	for (i = 0; i < 6; i++) {
		mdelay(300);
		status = __ap_recv(ap_dev->qid, &psmid, reply, 4096);
		if (status.response_code == AP_RESPONSE_NORMAL &&
		    psmid == 0x0102030405060708ULL)
			break;
	}
	if (i < 6) {
		/* Got an answer. */
		if (reply[0] == 0x00 && reply[1] == 0x86)
			ap_dev->device_type = AP_DEVICE_TYPE_PCICC;
		else
			ap_dev->device_type = AP_DEVICE_TYPE_PCICA;
		rc = 0;
	} else
		rc = -ENODEV;

out_free:
	free_page((unsigned long) reply);
out:
	return rc;
}

F
Felix Beck 已提交
1049 1050 1051 1052 1053
static void ap_interrupt_handler(void *unused1, void *unused2)
{
	tasklet_schedule(&ap_tasklet);
}

1054
/**
1055 1056 1057 1058 1059
 * __ap_scan_bus(): Scan the AP bus.
 * @dev: Pointer to device
 * @data: Pointer to data
 *
 * Scan the AP bus for new devices.
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
 */
static int __ap_scan_bus(struct device *dev, void *data)
{
	return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data;
}

static void ap_device_release(struct device *dev)
{
	struct ap_device *ap_dev = to_ap_dev(dev);

	kfree(ap_dev);
}

1073
static void ap_scan_bus(struct work_struct *unused)
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
{
	struct ap_device *ap_dev;
	struct device *dev;
	ap_qid_t qid;
	int queue_depth, device_type;
	int rc, i;

	if (ap_select_domain() != 0)
		return;
	for (i = 0; i < AP_DEVICES; i++) {
		qid = AP_MKQID(i, ap_domain_index);
		dev = bus_find_device(&ap_bus_type, NULL,
				      (void *)(unsigned long)qid,
				      __ap_scan_bus);
1088
		rc = ap_query_queue(qid, &queue_depth, &device_type);
1089
		if (dev) {
1090 1091 1092 1093 1094 1095
			if (rc == -EBUSY) {
				set_current_state(TASK_UNINTERRUPTIBLE);
				schedule_timeout(AP_RESET_TIMEOUT);
				rc = ap_query_queue(qid, &queue_depth,
						    &device_type);
			}
1096 1097 1098 1099
			ap_dev = to_ap_dev(dev);
			spin_lock_bh(&ap_dev->lock);
			if (rc || ap_dev->unregistered) {
				spin_unlock_bh(&ap_dev->lock);
1100 1101
				if (ap_dev->unregistered)
					i--;
1102
				device_unregister(dev);
1103
				put_device(dev);
1104
				continue;
1105 1106
			}
			spin_unlock_bh(&ap_dev->lock);
1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
			put_device(dev);
			continue;
		}
		if (rc)
			continue;
		rc = ap_init_queue(qid);
		if (rc)
			continue;
		ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL);
		if (!ap_dev)
			break;
		ap_dev->qid = qid;
		ap_dev->queue_depth = queue_depth;
1120
		ap_dev->unregistered = 1;
1121 1122 1123
		spin_lock_init(&ap_dev->lock);
		INIT_LIST_HEAD(&ap_dev->pendingq);
		INIT_LIST_HEAD(&ap_dev->requestq);
1124
		INIT_LIST_HEAD(&ap_dev->list);
1125 1126
		setup_timer(&ap_dev->timeout, ap_request_timeout,
			    (unsigned long) ap_dev);
1127 1128 1129 1130 1131 1132 1133
		if (device_type == 0)
			ap_probe_device_type(ap_dev);
		else
			ap_dev->device_type = device_type;

		ap_dev->device.bus = &ap_bus_type;
		ap_dev->device.parent = ap_root_device;
1134 1135 1136 1137 1138
		if (dev_set_name(&ap_dev->device, "card%02x",
				 AP_QID_DEVICE(ap_dev->qid))) {
			kfree(ap_dev);
			continue;
		}
1139 1140 1141
		ap_dev->device.release = ap_device_release;
		rc = device_register(&ap_dev->device);
		if (rc) {
1142
			put_device(&ap_dev->device);
1143 1144 1145 1146 1147
			continue;
		}
		/* Add device attributes. */
		rc = sysfs_create_group(&ap_dev->device.kobj,
					&ap_dev_attr_group);
1148 1149 1150 1151 1152 1153
		if (!rc) {
			spin_lock_bh(&ap_dev->lock);
			ap_dev->unregistered = 0;
			spin_unlock_bh(&ap_dev->lock);
		}
		else
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
			device_unregister(&ap_dev->device);
	}
}

static void
ap_config_timeout(unsigned long ptr)
{
	queue_work(ap_work_queue, &ap_config_work);
	ap_config_timer.expires = jiffies + ap_config_time * HZ;
	add_timer(&ap_config_timer);
}

/**
1167 1168
 * ap_schedule_poll_timer(): Schedule poll timer.
 *
1169 1170 1171 1172
 * Set up the timer to run the poll tasklet
 */
static inline void ap_schedule_poll_timer(void)
{
1173
	ktime_t hr_time;
1174 1175

	spin_lock_bh(&ap_poll_timer_lock);
1176
	if (ap_using_interrupts() || ap_suspend_flag)
1177
		goto out;
1178
	if (hrtimer_is_queued(&ap_poll_timer))
1179
		goto out;
1180 1181 1182 1183 1184
	if (ktime_to_ns(hrtimer_expires_remaining(&ap_poll_timer)) <= 0) {
		hr_time = ktime_set(0, poll_timeout);
		hrtimer_forward_now(&ap_poll_timer, hr_time);
		hrtimer_restart(&ap_poll_timer);
	}
1185 1186
out:
	spin_unlock_bh(&ap_poll_timer_lock);
1187 1188 1189
}

/**
1190
 * ap_poll_read(): Receive pending reply messages from an AP device.
1191 1192 1193
 * @ap_dev: pointer to the AP device
 * @flags: pointer to control flags, bit 2^0 is set if another poll is
 *	   required, bit 2^1 is set if the poll timer needs to get armed
1194
 *
1195 1196
 * Returns 0 if the device is still present, -ENODEV if not.
 */
1197
static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags)
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
{
	struct ap_queue_status status;
	struct ap_message *ap_msg;

	if (ap_dev->queue_count <= 0)
		return 0;
	status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid,
			   ap_dev->reply->message, ap_dev->reply->length);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		atomic_dec(&ap_poll_requests);
1209
		ap_decrease_queue_count(ap_dev);
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
		list_for_each_entry(ap_msg, &ap_dev->pendingq, list) {
			if (ap_msg->psmid != ap_dev->reply->psmid)
				continue;
			list_del_init(&ap_msg->list);
			ap_dev->pendingq_count--;
			ap_dev->drv->receive(ap_dev, ap_msg, ap_dev->reply);
			break;
		}
		if (ap_dev->queue_count > 0)
			*flags |= 1;
		break;
	case AP_RESPONSE_NO_PENDING_REPLY:
		if (status.queue_empty) {
			/* The card shouldn't forget requests but who knows. */
1224
			atomic_sub(ap_dev->queue_count, &ap_poll_requests);
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238
			ap_dev->queue_count = 0;
			list_splice_init(&ap_dev->pendingq, &ap_dev->requestq);
			ap_dev->requestq_count += ap_dev->pendingq_count;
			ap_dev->pendingq_count = 0;
		} else
			*flags |= 2;
		break;
	default:
		return -ENODEV;
	}
	return 0;
}

/**
1239
 * ap_poll_write(): Send messages from the request queue to an AP device.
1240 1241 1242
 * @ap_dev: pointer to the AP device
 * @flags: pointer to control flags, bit 2^0 is set if another poll is
 *	   required, bit 2^1 is set if the poll timer needs to get armed
1243
 *
1244 1245
 * Returns 0 if the device is still present, -ENODEV if not.
 */
1246
static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags)
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
{
	struct ap_queue_status status;
	struct ap_message *ap_msg;

	if (ap_dev->requestq_count <= 0 ||
	    ap_dev->queue_count >= ap_dev->queue_depth)
		return 0;
	/* Start the next request on the queue. */
	ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list);
	status = __ap_send(ap_dev->qid, ap_msg->psmid,
1257
			   ap_msg->message, ap_msg->length, ap_msg->special);
1258 1259 1260
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		atomic_inc(&ap_poll_requests);
1261
		ap_increase_queue_count(ap_dev);
1262 1263 1264 1265 1266 1267 1268 1269 1270
		list_move_tail(&ap_msg->list, &ap_dev->pendingq);
		ap_dev->requestq_count--;
		ap_dev->pendingq_count++;
		if (ap_dev->queue_count < ap_dev->queue_depth &&
		    ap_dev->requestq_count > 0)
			*flags |= 1;
		*flags |= 2;
		break;
	case AP_RESPONSE_Q_FULL:
1271
	case AP_RESPONSE_RESET_IN_PROGRESS:
1272 1273 1274
		*flags |= 2;
		break;
	case AP_RESPONSE_MESSAGE_TOO_BIG:
1275
	case AP_RESPONSE_REQ_FAC_NOT_INST:
1276 1277 1278 1279 1280 1281 1282 1283
		return -EINVAL;
	default:
		return -ENODEV;
	}
	return 0;
}

/**
1284
 * ap_poll_queue(): Poll AP device for pending replies and send new messages.
1285 1286 1287
 * @ap_dev: pointer to the bus device
 * @flags: pointer to control flags, bit 2^0 is set if another poll is
 *	   required, bit 2^1 is set if the poll timer needs to get armed
1288 1289 1290
 *
 * Poll AP device for pending replies and send new messages. If either
 * ap_poll_read or ap_poll_write returns -ENODEV unregister the device.
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
 * Returns 0.
 */
static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags)
{
	int rc;

	rc = ap_poll_read(ap_dev, flags);
	if (rc)
		return rc;
	return ap_poll_write(ap_dev, flags);
}

/**
1304
 * __ap_queue_message(): Queue a message to a device.
1305 1306
 * @ap_dev: pointer to the AP device
 * @ap_msg: the message to be queued
1307 1308
 *
 * Queue a message to a device. Returns 0 if successful.
1309 1310 1311 1312 1313 1314 1315 1316
 */
static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
{
	struct ap_queue_status status;

	if (list_empty(&ap_dev->requestq) &&
	    ap_dev->queue_count < ap_dev->queue_depth) {
		status = __ap_send(ap_dev->qid, ap_msg->psmid,
1317 1318
				   ap_msg->message, ap_msg->length,
				   ap_msg->special);
1319 1320 1321 1322 1323
		switch (status.response_code) {
		case AP_RESPONSE_NORMAL:
			list_add_tail(&ap_msg->list, &ap_dev->pendingq);
			atomic_inc(&ap_poll_requests);
			ap_dev->pendingq_count++;
1324
			ap_increase_queue_count(ap_dev);
1325 1326 1327
			ap_dev->total_request_count++;
			break;
		case AP_RESPONSE_Q_FULL:
1328
		case AP_RESPONSE_RESET_IN_PROGRESS:
1329 1330 1331 1332
			list_add_tail(&ap_msg->list, &ap_dev->requestq);
			ap_dev->requestq_count++;
			ap_dev->total_request_count++;
			return -EBUSY;
1333
		case AP_RESPONSE_REQ_FAC_NOT_INST:
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363
		case AP_RESPONSE_MESSAGE_TOO_BIG:
			ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL));
			return -EINVAL;
		default:	/* Device is gone. */
			ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
			return -ENODEV;
		}
	} else {
		list_add_tail(&ap_msg->list, &ap_dev->requestq);
		ap_dev->requestq_count++;
		ap_dev->total_request_count++;
		return -EBUSY;
	}
	ap_schedule_poll_timer();
	return 0;
}

void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
{
	unsigned long flags;
	int rc;

	spin_lock_bh(&ap_dev->lock);
	if (!ap_dev->unregistered) {
		/* Make room on the queue by polling for finished requests. */
		rc = ap_poll_queue(ap_dev, &flags);
		if (!rc)
			rc = __ap_queue_message(ap_dev, ap_msg);
		if (!rc)
			wake_up(&ap_poll_wait);
1364 1365
		if (rc == -ENODEV)
			ap_dev->unregistered = 1;
1366 1367
	} else {
		ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
1368
		rc = -ENODEV;
1369 1370 1371 1372 1373 1374 1375 1376
	}
	spin_unlock_bh(&ap_dev->lock);
	if (rc == -ENODEV)
		device_unregister(&ap_dev->device);
}
EXPORT_SYMBOL(ap_queue_message);

/**
1377 1378 1379 1380
 * ap_cancel_message(): Cancel a crypto request.
 * @ap_dev: The AP device that has the message queued
 * @ap_msg: The message that is to be removed
 *
1381
 * Cancel a crypto request. This is done by removing the request
1382
 * from the device pending or request queue. Note that the
1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
 * request stays on the AP queue. When it finishes the message
 * reply will be discarded because the psmid can't be found.
 */
void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
{
	struct ap_message *tmp;

	spin_lock_bh(&ap_dev->lock);
	if (!list_empty(&ap_msg->list)) {
		list_for_each_entry(tmp, &ap_dev->pendingq, list)
			if (tmp->psmid == ap_msg->psmid) {
				ap_dev->pendingq_count--;
				goto found;
			}
		ap_dev->requestq_count--;
	found:
		list_del_init(&ap_msg->list);
	}
	spin_unlock_bh(&ap_dev->lock);
}
EXPORT_SYMBOL(ap_cancel_message);

/**
1406
 * ap_poll_timeout(): AP receive polling for finished AP requests.
1407
 * @unused: Unused pointer.
1408
 *
1409
 * Schedules the AP tasklet using a high resolution timer.
1410
 */
1411
static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused)
1412 1413
{
	tasklet_schedule(&ap_tasklet);
1414
	return HRTIMER_NORESTART;
1415 1416
}

1417
/**
1418 1419 1420
 * ap_reset(): Reset a not responding AP device.
 * @ap_dev: Pointer to the AP device
 *
1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438
 * Reset a not responding AP device and move all requests from the
 * pending queue to the request queue.
 */
static void ap_reset(struct ap_device *ap_dev)
{
	int rc;

	ap_dev->reset = AP_RESET_IGNORE;
	atomic_sub(ap_dev->queue_count, &ap_poll_requests);
	ap_dev->queue_count = 0;
	list_splice_init(&ap_dev->pendingq, &ap_dev->requestq);
	ap_dev->requestq_count += ap_dev->pendingq_count;
	ap_dev->pendingq_count = 0;
	rc = ap_init_queue(ap_dev->qid);
	if (rc == -ENODEV)
		ap_dev->unregistered = 1;
}

1439
static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags)
1440 1441
{
	if (!ap_dev->unregistered) {
1442
		if (ap_poll_queue(ap_dev, flags))
1443
			ap_dev->unregistered = 1;
1444 1445
		if (ap_dev->reset == AP_RESET_DO)
			ap_reset(ap_dev);
1446
	}
1447 1448 1449
	return 0;
}

1450 1451 1452 1453 1454 1455 1456 1457
/**
 * ap_poll_all(): Poll all AP devices.
 * @dummy: Unused variable
 *
 * Poll all AP devices on the bus in a round robin fashion. Continue
 * polling until bit 2^0 of the control flags is not set. If bit 2^1
 * of the control flags has been set arm the poll timer.
 */
1458 1459 1460
static void ap_poll_all(unsigned long dummy)
{
	unsigned long flags;
1461
	struct ap_device *ap_dev;
1462

F
Felix Beck 已提交
1463 1464 1465 1466 1467 1468
	/* Reset the indicator if interrupts are used. Thus new interrupts can
	 * be received. Doing it in the beginning of the tasklet is therefor
	 * important that no requests on any AP get lost.
	 */
	if (ap_using_interrupts())
		xchg((u8 *)ap_interrupt_indicator, 0);
1469 1470
	do {
		flags = 0;
1471
		spin_lock(&ap_device_list_lock);
1472
		list_for_each_entry(ap_dev, &ap_device_list, list) {
1473
			spin_lock(&ap_dev->lock);
1474
			__ap_poll_device(ap_dev, &flags);
1475
			spin_unlock(&ap_dev->lock);
1476
		}
1477
		spin_unlock(&ap_device_list_lock);
1478 1479 1480 1481 1482 1483
	} while (flags & 1);
	if (flags & 2)
		ap_schedule_poll_timer();
}

/**
1484 1485 1486
 * ap_poll_thread(): Thread that polls for finished requests.
 * @data: Unused pointer
 *
1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
 * AP bus poll thread. The purpose of this thread is to poll for
 * finished requests in a loop if there is a "free" cpu - that is
 * a cpu that doesn't have anything better to do. The polling stops
 * as soon as there is another task or if all messages have been
 * delivered.
 */
static int ap_poll_thread(void *data)
{
	DECLARE_WAITQUEUE(wait, current);
	unsigned long flags;
	int requests;
1498
	struct ap_device *ap_dev;
1499

1500
	set_user_nice(current, 19);
1501
	while (1) {
1502 1503
		if (ap_suspend_flag)
			return 0;
1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
		if (need_resched()) {
			schedule();
			continue;
		}
		add_wait_queue(&ap_poll_wait, &wait);
		set_current_state(TASK_INTERRUPTIBLE);
		if (kthread_should_stop())
			break;
		requests = atomic_read(&ap_poll_requests);
		if (requests <= 0)
			schedule();
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&ap_poll_wait, &wait);

		flags = 0;
1519
		spin_lock_bh(&ap_device_list_lock);
1520
		list_for_each_entry(ap_dev, &ap_device_list, list) {
1521
			spin_lock(&ap_dev->lock);
1522
			__ap_poll_device(ap_dev, &flags);
1523
			spin_unlock(&ap_dev->lock);
1524
		}
1525
		spin_unlock_bh(&ap_device_list_lock);
1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
	}
	set_current_state(TASK_RUNNING);
	remove_wait_queue(&ap_poll_wait, &wait);
	return 0;
}

static int ap_poll_thread_start(void)
{
	int rc;

1536
	if (ap_using_interrupts() || ap_suspend_flag)
F
Felix Beck 已提交
1537
		return 0;
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560
	mutex_lock(&ap_poll_thread_mutex);
	if (!ap_poll_kthread) {
		ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
		rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0;
		if (rc)
			ap_poll_kthread = NULL;
	}
	else
		rc = 0;
	mutex_unlock(&ap_poll_thread_mutex);
	return rc;
}

static void ap_poll_thread_stop(void)
{
	mutex_lock(&ap_poll_thread_mutex);
	if (ap_poll_kthread) {
		kthread_stop(ap_poll_kthread);
		ap_poll_kthread = NULL;
	}
	mutex_unlock(&ap_poll_thread_mutex);
}

1561
/**
1562 1563 1564 1565
 * ap_request_timeout(): Handling of request timeouts
 * @data: Holds the AP device.
 *
 * Handles request timeouts.
1566 1567 1568 1569 1570
 */
static void ap_request_timeout(unsigned long data)
{
	struct ap_device *ap_dev = (struct ap_device *) data;

F
Felix Beck 已提交
1571
	if (ap_dev->reset == AP_RESET_ARMED) {
1572
		ap_dev->reset = AP_RESET_DO;
F
Felix Beck 已提交
1573 1574 1575 1576

		if (ap_using_interrupts())
			tasklet_schedule(&ap_tasklet);
	}
1577 1578
}

1579 1580 1581 1582
static void ap_reset_domain(void)
{
	int i;

1583 1584 1585
	if (ap_domain_index != -1)
		for (i = 0; i < AP_DEVICES; i++)
			ap_reset_queue(AP_MKQID(i, ap_domain_index));
1586 1587 1588
}

static void ap_reset_all(void)
1589 1590 1591 1592 1593 1594 1595 1596 1597
{
	int i, j;

	for (i = 0; i < AP_DOMAINS; i++)
		for (j = 0; j < AP_DEVICES; j++)
			ap_reset_queue(AP_MKQID(j, i));
}

static struct reset_call ap_reset_call = {
1598
	.fn = ap_reset_all,
1599 1600
};

1601
/**
1602 1603 1604
 * ap_module_init(): The module initialization code.
 *
 * Initializes the module.
1605 1606 1607 1608 1609 1610
 */
int __init ap_module_init(void)
{
	int rc, i;

	if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) {
1611 1612
		pr_warning("%d is not a valid cryptographic domain\n",
			   ap_domain_index);
1613 1614
		return -EINVAL;
	}
1615 1616 1617 1618 1619 1620
	/* In resume callback we need to know if the user had set the domain.
	 * If so, we can not just reset it.
	 */
	if (ap_domain_index >= 0)
		user_set_domain = 1;

1621
	if (ap_instructions_available() != 0) {
1622 1623
		pr_warning("The hardware system does not support "
			   "AP instructions\n");
1624 1625
		return -ENODEV;
	}
F
Felix Beck 已提交
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
	if (ap_interrupts_available()) {
		isc_register(AP_ISC);
		ap_interrupt_indicator = s390_register_adapter_interrupt(
			&ap_interrupt_handler, NULL, AP_ISC);
		if (IS_ERR(ap_interrupt_indicator)) {
			ap_interrupt_indicator = NULL;
			isc_unregister(AP_ISC);
		}
	}

1636
	register_reset_call(&ap_reset_call);
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648

	/* Create /sys/bus/ap. */
	rc = bus_register(&ap_bus_type);
	if (rc)
		goto out;
	for (i = 0; ap_bus_attrs[i]; i++) {
		rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]);
		if (rc)
			goto out_bus;
	}

	/* Create /sys/devices/ap. */
M
Mark McLoughlin 已提交
1649
	ap_root_device = root_device_register("ap");
1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662
	rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0;
	if (rc)
		goto out_bus;

	ap_work_queue = create_singlethread_workqueue("kapwork");
	if (!ap_work_queue) {
		rc = -ENOMEM;
		goto out_root;
	}

	if (ap_select_domain() == 0)
		ap_scan_bus(NULL);

1663
	/* Setup the AP bus rescan timer. */
1664 1665 1666 1667 1668 1669
	init_timer(&ap_config_timer);
	ap_config_timer.function = ap_config_timeout;
	ap_config_timer.data = 0;
	ap_config_timer.expires = jiffies + ap_config_time * HZ;
	add_timer(&ap_config_timer);

1670 1671 1672 1673 1674
	/* Setup the high resultion poll timer.
	 * If we are running under z/VM adjust polling to z/VM polling rate.
	 */
	if (MACHINE_IS_VM)
		poll_timeout = 1500000;
1675
	spin_lock_init(&ap_poll_timer_lock);
1676 1677 1678
	hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
	ap_poll_timer.function = ap_poll_timeout;

1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689
	/* Start the low priority AP bus poll thread. */
	if (ap_thread_flag) {
		rc = ap_poll_thread_start();
		if (rc)
			goto out_work;
	}

	return 0;

out_work:
	del_timer_sync(&ap_config_timer);
1690
	hrtimer_cancel(&ap_poll_timer);
1691 1692
	destroy_workqueue(ap_work_queue);
out_root:
M
Mark McLoughlin 已提交
1693
	root_device_unregister(ap_root_device);
1694 1695 1696 1697 1698
out_bus:
	while (i--)
		bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
	bus_unregister(&ap_bus_type);
out:
1699
	unregister_reset_call(&ap_reset_call);
F
Felix Beck 已提交
1700 1701 1702 1703
	if (ap_using_interrupts()) {
		s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC);
		isc_unregister(AP_ISC);
	}
1704 1705 1706 1707 1708 1709 1710 1711 1712
	return rc;
}

static int __ap_match_all(struct device *dev, void *data)
{
	return 1;
}

/**
1713 1714 1715
 * ap_modules_exit(): The module termination code
 *
 * Terminates the module.
1716 1717 1718 1719 1720 1721
 */
void ap_module_exit(void)
{
	int i;
	struct device *dev;

1722
	ap_reset_domain();
1723 1724
	ap_poll_thread_stop();
	del_timer_sync(&ap_config_timer);
1725
	hrtimer_cancel(&ap_poll_timer);
1726
	destroy_workqueue(ap_work_queue);
1727
	tasklet_kill(&ap_tasklet);
M
Mark McLoughlin 已提交
1728
	root_device_unregister(ap_root_device);
1729 1730 1731 1732 1733 1734 1735 1736 1737
	while ((dev = bus_find_device(&ap_bus_type, NULL, NULL,
		    __ap_match_all)))
	{
		device_unregister(dev);
		put_device(dev);
	}
	for (i = 0; ap_bus_attrs[i]; i++)
		bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
	bus_unregister(&ap_bus_type);
1738
	unregister_reset_call(&ap_reset_call);
F
Felix Beck 已提交
1739 1740 1741 1742
	if (ap_using_interrupts()) {
		s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC);
		isc_unregister(AP_ISC);
	}
1743 1744 1745 1746 1747 1748
}

#ifndef CONFIG_ZCRYPT_MONOLITHIC
module_init(ap_module_init);
module_exit(ap_module_exit);
#endif