2 * Copyright IBM Corp. 2006, 2012
3 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
4 * Martin Schwidefsky <schwidefsky@de.ibm.com>
5 * Ralph Wuerthner <rwuerthn@de.ibm.com>
6 * Felix Beck <felix.beck@de.ibm.com>
7 * Holger Dengler <hd@linux.vnet.ibm.com>
9 * Adjunct processor bus.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #define KMSG_COMPONENT "ap"
27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
29 #include <linux/kernel_stat.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/delay.h>
33 #include <linux/err.h>
34 #include <linux/interrupt.h>
35 #include <linux/workqueue.h>
36 #include <linux/slab.h>
37 #include <linux/notifier.h>
38 #include <linux/kthread.h>
39 #include <linux/mutex.h>
40 #include <asm/reset.h>
42 #include <linux/atomic.h>
44 #include <linux/hrtimer.h>
45 #include <linux/ktime.h>
46 #include <asm/facility.h>
47 #include <linux/crypto.h>
51 /* Some prototypes. */
52 static void ap_scan_bus(struct work_struct *);
53 static void ap_poll_all(unsigned long);
54 static enum hrtimer_restart ap_poll_timeout(struct hrtimer *);
55 static int ap_poll_thread_start(void);
56 static void ap_poll_thread_stop(void);
57 static void ap_request_timeout(unsigned long);
58 static inline void ap_schedule_poll_timer(void);
59 static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags);
60 static int ap_device_remove(struct device *dev);
61 static int ap_device_probe(struct device *dev);
62 static void ap_interrupt_handler(struct airq_struct *airq);
63 static void ap_reset(struct ap_device *ap_dev);
64 static void ap_config_timeout(unsigned long ptr);
65 static int ap_select_domain(void);
66 static void ap_query_configuration(void);
71 MODULE_AUTHOR("IBM Corporation");
72 MODULE_DESCRIPTION("Adjunct Processor Bus driver, " \
73 "Copyright IBM Corp. 2006, 2012");
74 MODULE_LICENSE("GPL");
75 MODULE_ALIAS_CRYPTO("z90crypt");
80 int ap_domain_index = -1; /* Adjunct Processor Domain Index */
81 module_param_named(domain, ap_domain_index, int, S_IRUSR|S_IRGRP);
82 MODULE_PARM_DESC(domain, "domain index for ap devices");
83 EXPORT_SYMBOL(ap_domain_index);
85 static int ap_thread_flag = 0;
86 module_param_named(poll_thread, ap_thread_flag, int, S_IRUSR|S_IRGRP);
87 MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
89 static struct device *ap_root_device = NULL;
90 static struct ap_config_info *ap_configuration;
91 static DEFINE_SPINLOCK(ap_device_list_lock);
92 static LIST_HEAD(ap_device_list);
95 * Workqueue & timer for bus rescan.
97 static struct workqueue_struct *ap_work_queue;
98 static struct timer_list ap_config_timer;
99 static int ap_config_time = AP_CONFIG_TIME;
100 static DECLARE_WORK(ap_config_work, ap_scan_bus);
103 * Tasklet & timer for AP request polling and interrupts
105 static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0);
106 static atomic_t ap_poll_requests = ATOMIC_INIT(0);
107 static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
108 static struct task_struct *ap_poll_kthread = NULL;
109 static DEFINE_MUTEX(ap_poll_thread_mutex);
110 static DEFINE_SPINLOCK(ap_poll_timer_lock);
111 static struct hrtimer ap_poll_timer;
112 /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds.
113 * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/
114 static unsigned long long poll_timeout = 250000;
117 static int ap_suspend_flag;
118 /* Flag to check if domain was set through module parameter domain=. This is
119 * important when supsend and resume is done in a z/VM environment where the
120 * domain might change. */
121 static int user_set_domain = 0;
122 static struct bus_type ap_bus_type;
124 /* Adapter interrupt definitions */
125 static int ap_airq_flag;
127 static struct airq_struct ap_airq = {
128 .handler = ap_interrupt_handler,
133 * ap_using_interrupts() - Returns non-zero if interrupt support is
136 static inline int ap_using_interrupts(void)
142 * ap_intructions_available() - Test if AP instructions are available.
144 * Returns 0 if the AP instructions are installed.
146 static inline int ap_instructions_available(void)
148 register unsigned long reg0 asm ("0") = AP_MKQID(0,0);
149 register unsigned long reg1 asm ("1") = -ENODEV;
150 register unsigned long reg2 asm ("2") = 0UL;
153 " .long 0xb2af0000\n" /* PQAP(TAPQ) */
157 : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" );
162 * ap_interrupts_available(): Test if AP interrupts are available.
164 * Returns 1 if AP interrupts are available.
166 static int ap_interrupts_available(void)
168 return test_facility(2) && test_facility(65);
172 * ap_configuration_available(): Test if AP configuration
173 * information is available.
175 * Returns 1 if AP configuration information is available.
178 static int ap_configuration_available(void)
180 return test_facility(2) && test_facility(12);
185 * ap_test_queue(): Test adjunct processor queue.
186 * @qid: The AP queue number
187 * @queue_depth: Pointer to queue depth value
188 * @device_type: Pointer to device type value
190 * Returns AP queue status structure.
192 static inline struct ap_queue_status
193 ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type)
195 register unsigned long reg0 asm ("0") = qid;
196 register struct ap_queue_status reg1 asm ("1");
197 register unsigned long reg2 asm ("2") = 0UL;
199 asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */
200 : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
201 *device_type = (int) (reg2 >> 24);
202 *queue_depth = (int) (reg2 & 0xff);
207 * ap_reset_queue(): Reset adjunct processor queue.
208 * @qid: The AP queue number
210 * Returns AP queue status structure.
212 static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid)
214 register unsigned long reg0 asm ("0") = qid | 0x01000000UL;
215 register struct ap_queue_status reg1 asm ("1");
216 register unsigned long reg2 asm ("2") = 0UL;
219 ".long 0xb2af0000" /* PQAP(RAPQ) */
220 : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
226 * ap_queue_interruption_control(): Enable interruption for a specific AP.
227 * @qid: The AP queue number
228 * @ind: The notification indicator byte
230 * Returns AP queue status.
232 static inline struct ap_queue_status
233 ap_queue_interruption_control(ap_qid_t qid, void *ind)
235 register unsigned long reg0 asm ("0") = qid | 0x03000000UL;
236 register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC;
237 register struct ap_queue_status reg1_out asm ("1");
238 register void *reg2 asm ("2") = ind;
240 ".long 0xb2af0000" /* PQAP(AQIC) */
241 : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2)
249 static inline struct ap_queue_status
250 __ap_query_functions(ap_qid_t qid, unsigned int *functions)
252 register unsigned long reg0 asm ("0") = 0UL | qid | (1UL << 23);
253 register struct ap_queue_status reg1 asm ("1") = AP_QUEUE_STATUS_INVALID;
254 register unsigned long reg2 asm ("2");
257 ".long 0xb2af0000\n" /* PQAP(TAPQ) */
260 : "+d" (reg0), "+d" (reg1), "=d" (reg2)
264 *functions = (unsigned int)(reg2 >> 32);
270 static inline int __ap_query_configuration(struct ap_config_info *config)
272 register unsigned long reg0 asm ("0") = 0x04000000UL;
273 register unsigned long reg1 asm ("1") = -EINVAL;
274 register unsigned char *reg2 asm ("2") = (unsigned char *)config;
277 ".long 0xb2af0000\n" /* PQAP(QCI) */
281 : "+d" (reg0), "+d" (reg1), "+d" (reg2)
290 * ap_query_functions(): Query supported functions.
291 * @qid: The AP queue number
292 * @functions: Pointer to functions field.
296 * -ENODEV if queue not valid.
297 * -EBUSY if device busy.
298 * -EINVAL if query function is not supported
300 static int ap_query_functions(ap_qid_t qid, unsigned int *functions)
303 struct ap_queue_status status;
305 status = __ap_query_functions(qid, functions);
307 for (i = 0; i < AP_MAX_RESET; i++) {
308 if (ap_queue_status_invalid_test(&status))
311 switch (status.response_code) {
312 case AP_RESPONSE_NORMAL:
314 case AP_RESPONSE_RESET_IN_PROGRESS:
315 case AP_RESPONSE_BUSY:
317 case AP_RESPONSE_Q_NOT_AVAIL:
318 case AP_RESPONSE_DECONFIGURED:
319 case AP_RESPONSE_CHECKSTOPPED:
320 case AP_RESPONSE_INVALID_ADDRESS:
322 case AP_RESPONSE_OTHERWISE_CHANGED:
327 if (i < AP_MAX_RESET - 1) {
329 status = __ap_query_functions(qid, functions);
339 * ap_queue_enable_interruption(): Enable interruption on an AP.
340 * @qid: The AP queue number
341 * @ind: the notification indicator byte
343 * Enables interruption on AP queue via ap_queue_interruption_control(). Based
344 * on the return value it waits a while and tests the AP queue if interrupts
345 * have been switched on using ap_test_queue().
347 static int ap_queue_enable_interruption(ap_qid_t qid, void *ind)
350 struct ap_queue_status status;
351 int t_depth, t_device_type, rc, i;
354 status = ap_queue_interruption_control(qid, ind);
356 for (i = 0; i < AP_MAX_RESET; i++) {
357 switch (status.response_code) {
358 case AP_RESPONSE_NORMAL:
359 if (status.int_enabled)
362 case AP_RESPONSE_RESET_IN_PROGRESS:
363 case AP_RESPONSE_BUSY:
364 if (i < AP_MAX_RESET - 1) {
366 status = ap_queue_interruption_control(qid,
371 case AP_RESPONSE_Q_NOT_AVAIL:
372 case AP_RESPONSE_DECONFIGURED:
373 case AP_RESPONSE_CHECKSTOPPED:
374 case AP_RESPONSE_INVALID_ADDRESS:
376 case AP_RESPONSE_OTHERWISE_CHANGED:
377 if (status.int_enabled)
383 if (i < AP_MAX_RESET - 1) {
385 status = ap_test_queue(qid, &t_depth, &t_device_type);
395 * __ap_send(): Send message to adjunct processor queue.
396 * @qid: The AP queue number
397 * @psmid: The program supplied message identifier
398 * @msg: The message text
399 * @length: The message length
400 * @special: Special Bit
402 * Returns AP queue status structure.
403 * Condition code 1 on NQAP can't happen because the L bit is 1.
404 * Condition code 2 on NQAP also means the send is incomplete,
405 * because a segment boundary was reached. The NQAP is repeated.
407 static inline struct ap_queue_status
408 __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length,
409 unsigned int special)
411 typedef struct { char _[length]; } msgblock;
412 register unsigned long reg0 asm ("0") = qid | 0x40000000UL;
413 register struct ap_queue_status reg1 asm ("1");
414 register unsigned long reg2 asm ("2") = (unsigned long) msg;
415 register unsigned long reg3 asm ("3") = (unsigned long) length;
416 register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32);
417 register unsigned long reg5 asm ("5") = psmid & 0xffffffff;
423 "0: .long 0xb2ad0042\n" /* NQAP */
425 : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3)
426 : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg)
431 int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length)
433 struct ap_queue_status status;
435 status = __ap_send(qid, psmid, msg, length, 0);
436 switch (status.response_code) {
437 case AP_RESPONSE_NORMAL:
439 case AP_RESPONSE_Q_FULL:
440 case AP_RESPONSE_RESET_IN_PROGRESS:
442 case AP_RESPONSE_REQ_FAC_NOT_INST:
444 default: /* Device is gone. */
448 EXPORT_SYMBOL(ap_send);
451 * __ap_recv(): Receive message from adjunct processor queue.
452 * @qid: The AP queue number
453 * @psmid: Pointer to program supplied message identifier
454 * @msg: The message text
455 * @length: The message length
457 * Returns AP queue status structure.
458 * Condition code 1 on DQAP means the receive has taken place
459 * but only partially. The response is incomplete, hence the
461 * Condition code 2 on DQAP also means the receive is incomplete,
462 * this time because a segment boundary was reached. Again, the
464 * Note that gpr2 is used by the DQAP instruction to keep track of
465 * any 'residual' length, in case the instruction gets interrupted.
466 * Hence it gets zeroed before the instruction.
468 static inline struct ap_queue_status
469 __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
471 typedef struct { char _[length]; } msgblock;
472 register unsigned long reg0 asm("0") = qid | 0x80000000UL;
473 register struct ap_queue_status reg1 asm ("1");
474 register unsigned long reg2 asm("2") = 0UL;
475 register unsigned long reg4 asm("4") = (unsigned long) msg;
476 register unsigned long reg5 asm("5") = (unsigned long) length;
477 register unsigned long reg6 asm("6") = 0UL;
478 register unsigned long reg7 asm("7") = 0UL;
482 "0: .long 0xb2ae0064\n" /* DQAP */
484 : "+d" (reg0), "=d" (reg1), "+d" (reg2),
485 "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7),
486 "=m" (*(msgblock *) msg) : : "cc" );
487 *psmid = (((unsigned long long) reg6) << 32) + reg7;
491 int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
493 struct ap_queue_status status;
495 status = __ap_recv(qid, psmid, msg, length);
496 switch (status.response_code) {
497 case AP_RESPONSE_NORMAL:
499 case AP_RESPONSE_NO_PENDING_REPLY:
500 if (status.queue_empty)
503 case AP_RESPONSE_RESET_IN_PROGRESS:
509 EXPORT_SYMBOL(ap_recv);
512 * ap_query_queue(): Check if an AP queue is available.
513 * @qid: The AP queue number
514 * @queue_depth: Pointer to queue depth value
515 * @device_type: Pointer to device type value
517 * The test is repeated for AP_MAX_RESET times.
519 static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type)
521 struct ap_queue_status status;
522 int t_depth, t_device_type, rc, i;
525 for (i = 0; i < AP_MAX_RESET; i++) {
526 status = ap_test_queue(qid, &t_depth, &t_device_type);
527 switch (status.response_code) {
528 case AP_RESPONSE_NORMAL:
529 *queue_depth = t_depth + 1;
530 *device_type = t_device_type;
533 case AP_RESPONSE_Q_NOT_AVAIL:
536 case AP_RESPONSE_RESET_IN_PROGRESS:
538 case AP_RESPONSE_DECONFIGURED:
541 case AP_RESPONSE_CHECKSTOPPED:
544 case AP_RESPONSE_INVALID_ADDRESS:
547 case AP_RESPONSE_OTHERWISE_CHANGED:
549 case AP_RESPONSE_BUSY:
556 if (i < AP_MAX_RESET - 1)
563 * ap_init_queue(): Reset an AP queue.
564 * @qid: The AP queue number
566 * Reset an AP queue and wait for it to become available again.
568 static int ap_init_queue(ap_qid_t qid)
570 struct ap_queue_status status;
574 status = ap_reset_queue(qid);
575 for (i = 0; i < AP_MAX_RESET; i++) {
576 switch (status.response_code) {
577 case AP_RESPONSE_NORMAL:
578 if (status.queue_empty)
581 case AP_RESPONSE_Q_NOT_AVAIL:
582 case AP_RESPONSE_DECONFIGURED:
583 case AP_RESPONSE_CHECKSTOPPED:
584 i = AP_MAX_RESET; /* return with -ENODEV */
586 case AP_RESPONSE_RESET_IN_PROGRESS:
588 case AP_RESPONSE_BUSY:
592 if (rc != -ENODEV && rc != -EBUSY)
594 if (i < AP_MAX_RESET - 1) {
595 /* Time we are waiting until we give up (0.7sec * 90).
596 * Since the actual request (in progress) will not
597 * interrupted immediately for the reset command,
598 * we have to be patient. In worst case we have to
599 * wait 60sec + reset time (some msec).
601 schedule_timeout(AP_RESET_TIMEOUT);
602 status = ap_test_queue(qid, &dummy, &dummy);
605 if (rc == 0 && ap_using_interrupts()) {
606 rc = ap_queue_enable_interruption(qid, ap_airq.lsi_ptr);
607 /* If interruption mode is supported by the machine,
608 * but an AP can not be enabled for interruption then
609 * the AP will be discarded. */
611 pr_err("Registering adapter interrupts for "
612 "AP %d failed\n", AP_QID_DEVICE(qid));
618 * ap_increase_queue_count(): Arm request timeout.
619 * @ap_dev: Pointer to an AP device.
621 * Arm request timeout if an AP device was idle and a new request is submitted.
623 static void ap_increase_queue_count(struct ap_device *ap_dev)
625 int timeout = ap_dev->drv->request_timeout;
627 ap_dev->queue_count++;
628 if (ap_dev->queue_count == 1) {
629 mod_timer(&ap_dev->timeout, jiffies + timeout);
630 ap_dev->reset = AP_RESET_ARMED;
635 * ap_decrease_queue_count(): Decrease queue count.
636 * @ap_dev: Pointer to an AP device.
638 * If AP device is still alive, re-schedule request timeout if there are still
641 static void ap_decrease_queue_count(struct ap_device *ap_dev)
643 int timeout = ap_dev->drv->request_timeout;
645 ap_dev->queue_count--;
646 if (ap_dev->queue_count > 0)
647 mod_timer(&ap_dev->timeout, jiffies + timeout);
650 * The timeout timer should to be disabled now - since
651 * del_timer_sync() is very expensive, we just tell via the
652 * reset flag to ignore the pending timeout timer.
654 ap_dev->reset = AP_RESET_IGNORE;
658 * AP device related attributes.
660 static ssize_t ap_hwtype_show(struct device *dev,
661 struct device_attribute *attr, char *buf)
663 struct ap_device *ap_dev = to_ap_dev(dev);
664 return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type);
667 static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL);
669 static ssize_t ap_raw_hwtype_show(struct device *dev,
670 struct device_attribute *attr, char *buf)
672 struct ap_device *ap_dev = to_ap_dev(dev);
674 return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->raw_hwtype);
677 static DEVICE_ATTR(raw_hwtype, 0444, ap_raw_hwtype_show, NULL);
679 static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr,
682 struct ap_device *ap_dev = to_ap_dev(dev);
683 return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth);
686 static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL);
687 static ssize_t ap_request_count_show(struct device *dev,
688 struct device_attribute *attr,
691 struct ap_device *ap_dev = to_ap_dev(dev);
694 spin_lock_bh(&ap_dev->lock);
695 rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count);
696 spin_unlock_bh(&ap_dev->lock);
700 static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL);
702 static ssize_t ap_requestq_count_show(struct device *dev,
703 struct device_attribute *attr, char *buf)
705 struct ap_device *ap_dev = to_ap_dev(dev);
708 spin_lock_bh(&ap_dev->lock);
709 rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->requestq_count);
710 spin_unlock_bh(&ap_dev->lock);
714 static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL);
716 static ssize_t ap_pendingq_count_show(struct device *dev,
717 struct device_attribute *attr, char *buf)
719 struct ap_device *ap_dev = to_ap_dev(dev);
722 spin_lock_bh(&ap_dev->lock);
723 rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->pendingq_count);
724 spin_unlock_bh(&ap_dev->lock);
728 static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL);
730 static ssize_t ap_modalias_show(struct device *dev,
731 struct device_attribute *attr, char *buf)
733 return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type);
736 static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL);
738 static ssize_t ap_functions_show(struct device *dev,
739 struct device_attribute *attr, char *buf)
741 struct ap_device *ap_dev = to_ap_dev(dev);
742 return snprintf(buf, PAGE_SIZE, "0x%08X\n", ap_dev->functions);
745 static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL);
747 static struct attribute *ap_dev_attrs[] = {
748 &dev_attr_hwtype.attr,
749 &dev_attr_raw_hwtype.attr,
750 &dev_attr_depth.attr,
751 &dev_attr_request_count.attr,
752 &dev_attr_requestq_count.attr,
753 &dev_attr_pendingq_count.attr,
754 &dev_attr_modalias.attr,
755 &dev_attr_ap_functions.attr,
758 static struct attribute_group ap_dev_attr_group = {
759 .attrs = ap_dev_attrs
764 * @dev: Pointer to device
765 * @drv: Pointer to device_driver
767 * AP bus driver registration/unregistration.
769 static int ap_bus_match(struct device *dev, struct device_driver *drv)
771 struct ap_device *ap_dev = to_ap_dev(dev);
772 struct ap_driver *ap_drv = to_ap_drv(drv);
773 struct ap_device_id *id;
776 * Compare device type of the device with the list of
777 * supported types of the device_driver.
779 for (id = ap_drv->ids; id->match_flags; id++) {
780 if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) &&
781 (id->dev_type != ap_dev->device_type))
789 * ap_uevent(): Uevent function for AP devices.
790 * @dev: Pointer to device
791 * @env: Pointer to kobj_uevent_env
793 * It sets up a single environment variable DEV_TYPE which contains the
794 * hardware device type.
796 static int ap_uevent (struct device *dev, struct kobj_uevent_env *env)
798 struct ap_device *ap_dev = to_ap_dev(dev);
804 /* Set up DEV_TYPE environment variable. */
805 retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type);
810 retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type);
815 static int ap_bus_suspend(struct device *dev, pm_message_t state)
817 struct ap_device *ap_dev = to_ap_dev(dev);
820 if (!ap_suspend_flag) {
823 /* Disable scanning for devices, thus we do not want to scan
824 * for them after removing.
826 del_timer_sync(&ap_config_timer);
827 if (ap_work_queue != NULL) {
828 destroy_workqueue(ap_work_queue);
829 ap_work_queue = NULL;
832 tasklet_disable(&ap_tasklet);
834 /* Poll on the device until all requests are finished. */
837 spin_lock_bh(&ap_dev->lock);
838 __ap_poll_device(ap_dev, &flags);
839 spin_unlock_bh(&ap_dev->lock);
840 } while ((flags & 1) || (flags & 2));
842 spin_lock_bh(&ap_dev->lock);
843 ap_dev->unregistered = 1;
844 spin_unlock_bh(&ap_dev->lock);
849 static int ap_bus_resume(struct device *dev)
851 struct ap_device *ap_dev = to_ap_dev(dev);
854 if (ap_suspend_flag) {
856 if (ap_interrupts_available()) {
857 if (!ap_using_interrupts()) {
858 rc = register_adapter_interrupt(&ap_airq);
859 ap_airq_flag = (rc == 0);
862 if (ap_using_interrupts()) {
863 unregister_adapter_interrupt(&ap_airq);
867 ap_query_configuration();
868 if (!user_set_domain) {
869 ap_domain_index = -1;
872 init_timer(&ap_config_timer);
873 ap_config_timer.function = ap_config_timeout;
874 ap_config_timer.data = 0;
875 ap_config_timer.expires = jiffies + ap_config_time * HZ;
876 add_timer(&ap_config_timer);
877 ap_work_queue = create_singlethread_workqueue("kapwork");
880 tasklet_enable(&ap_tasklet);
881 if (!ap_using_interrupts())
882 ap_schedule_poll_timer();
884 tasklet_schedule(&ap_tasklet);
886 rc = ap_poll_thread_start();
891 if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) {
892 spin_lock_bh(&ap_dev->lock);
893 ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid),
895 spin_unlock_bh(&ap_dev->lock);
897 queue_work(ap_work_queue, &ap_config_work);
902 static struct bus_type ap_bus_type = {
904 .match = &ap_bus_match,
905 .uevent = &ap_uevent,
906 .suspend = ap_bus_suspend,
907 .resume = ap_bus_resume
910 static int ap_device_probe(struct device *dev)
912 struct ap_device *ap_dev = to_ap_dev(dev);
913 struct ap_driver *ap_drv = to_ap_drv(dev->driver);
916 ap_dev->drv = ap_drv;
918 spin_lock_bh(&ap_device_list_lock);
919 list_add(&ap_dev->list, &ap_device_list);
920 spin_unlock_bh(&ap_device_list_lock);
922 rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
924 spin_lock_bh(&ap_device_list_lock);
925 list_del_init(&ap_dev->list);
926 spin_unlock_bh(&ap_device_list_lock);
932 * __ap_flush_queue(): Flush requests.
933 * @ap_dev: Pointer to the AP device
935 * Flush all requests from the request/pending queue of an AP device.
937 static void __ap_flush_queue(struct ap_device *ap_dev)
939 struct ap_message *ap_msg, *next;
941 list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) {
942 list_del_init(&ap_msg->list);
943 ap_dev->pendingq_count--;
944 ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
946 list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) {
947 list_del_init(&ap_msg->list);
948 ap_dev->requestq_count--;
949 ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
953 void ap_flush_queue(struct ap_device *ap_dev)
955 spin_lock_bh(&ap_dev->lock);
956 __ap_flush_queue(ap_dev);
957 spin_unlock_bh(&ap_dev->lock);
959 EXPORT_SYMBOL(ap_flush_queue);
961 static int ap_device_remove(struct device *dev)
963 struct ap_device *ap_dev = to_ap_dev(dev);
964 struct ap_driver *ap_drv = ap_dev->drv;
966 ap_flush_queue(ap_dev);
967 del_timer_sync(&ap_dev->timeout);
968 spin_lock_bh(&ap_device_list_lock);
969 list_del_init(&ap_dev->list);
970 spin_unlock_bh(&ap_device_list_lock);
972 ap_drv->remove(ap_dev);
973 spin_lock_bh(&ap_dev->lock);
974 atomic_sub(ap_dev->queue_count, &ap_poll_requests);
975 spin_unlock_bh(&ap_dev->lock);
979 int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
982 struct device_driver *drv = &ap_drv->driver;
984 drv->bus = &ap_bus_type;
985 drv->probe = ap_device_probe;
986 drv->remove = ap_device_remove;
989 return driver_register(drv);
991 EXPORT_SYMBOL(ap_driver_register);
993 void ap_driver_unregister(struct ap_driver *ap_drv)
995 driver_unregister(&ap_drv->driver);
997 EXPORT_SYMBOL(ap_driver_unregister);
999 void ap_bus_force_rescan(void)
1001 /* reconfigure the AP bus rescan timer. */
1002 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
1003 /* processing a asynchronous bus rescan */
1004 queue_work(ap_work_queue, &ap_config_work);
1005 flush_work(&ap_config_work);
1007 EXPORT_SYMBOL(ap_bus_force_rescan);
1010 * AP bus attributes.
1012 static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
1014 return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
1017 static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL);
1019 static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf)
1021 if (ap_configuration != NULL) { /* QCI not supported */
1022 if (test_facility(76)) { /* format 1 - 256 bit domain field */
1023 return snprintf(buf, PAGE_SIZE,
1024 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
1025 ap_configuration->adm[0], ap_configuration->adm[1],
1026 ap_configuration->adm[2], ap_configuration->adm[3],
1027 ap_configuration->adm[4], ap_configuration->adm[5],
1028 ap_configuration->adm[6], ap_configuration->adm[7]);
1029 } else { /* format 0 - 16 bit domain field */
1030 return snprintf(buf, PAGE_SIZE, "%08x%08x\n",
1031 ap_configuration->adm[0], ap_configuration->adm[1]);
1034 return snprintf(buf, PAGE_SIZE, "not supported\n");
1038 static BUS_ATTR(ap_control_domain_mask, 0444,
1039 ap_control_domain_mask_show, NULL);
1041 static ssize_t ap_config_time_show(struct bus_type *bus, char *buf)
1043 return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
1046 static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
1048 return snprintf(buf, PAGE_SIZE, "%d\n",
1049 ap_using_interrupts() ? 1 : 0);
1052 static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL);
1054 static ssize_t ap_config_time_store(struct bus_type *bus,
1055 const char *buf, size_t count)
1059 if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120)
1061 ap_config_time = time;
1062 if (!timer_pending(&ap_config_timer) ||
1063 !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) {
1064 ap_config_timer.expires = jiffies + ap_config_time * HZ;
1065 add_timer(&ap_config_timer);
1070 static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store);
1072 static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf)
1074 return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
1077 static ssize_t ap_poll_thread_store(struct bus_type *bus,
1078 const char *buf, size_t count)
1082 if (sscanf(buf, "%d\n", &flag) != 1)
1085 rc = ap_poll_thread_start();
1090 ap_poll_thread_stop();
1094 static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store);
1096 static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
1098 return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
1101 static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
1104 unsigned long long time;
1107 /* 120 seconds = maximum poll interval */
1108 if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 ||
1109 time > 120000000000ULL)
1111 poll_timeout = time;
1112 hr_time = ktime_set(0, poll_timeout);
1114 if (!hrtimer_is_queued(&ap_poll_timer) ||
1115 !hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) {
1116 hrtimer_set_expires(&ap_poll_timer, hr_time);
1117 hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
1122 static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store);
1124 static struct bus_attribute *const ap_bus_attrs[] = {
1125 &bus_attr_ap_domain,
1126 &bus_attr_ap_control_domain_mask,
1127 &bus_attr_config_time,
1128 &bus_attr_poll_thread,
1129 &bus_attr_ap_interrupts,
1130 &bus_attr_poll_timeout,
1134 static inline int ap_test_config(unsigned int *field, unsigned int nr)
1138 return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
1142 * ap_test_config_card_id(): Test, whether an AP card ID is configured.
1145 * Returns 0 if the card is not configured
1146 * 1 if the card is configured or
1147 * if the configuration information is not available
1149 static inline int ap_test_config_card_id(unsigned int id)
1151 if (!ap_configuration)
1153 return ap_test_config(ap_configuration->apm, id);
1157 * ap_test_config_domain(): Test, whether an AP usage domain is configured.
1158 * @domain AP usage domain ID
1160 * Returns 0 if the usage domain is not configured
1161 * 1 if the usage domain is configured or
1162 * if the configuration information is not available
1164 static inline int ap_test_config_domain(unsigned int domain)
1166 if (!ap_configuration)
1168 return ap_test_config(ap_configuration->aqm, domain);
1172 * ap_query_configuration(): Query AP configuration information.
1174 * Query information of installed cards and configured domains from AP.
1176 static void ap_query_configuration(void)
1179 if (ap_configuration_available()) {
1180 if (!ap_configuration)
1182 kzalloc(sizeof(struct ap_config_info),
1184 if (ap_configuration)
1185 __ap_query_configuration(ap_configuration);
1187 ap_configuration = NULL;
1189 ap_configuration = NULL;
1194 * ap_select_domain(): Select an AP domain.
1196 * Pick one of the 16 AP domains.
1198 static int ap_select_domain(void)
1200 int queue_depth, device_type, count, max_count, best_domain;
1204 /* IF APXA isn't installed, only 16 domains could be defined */
1205 if (!ap_configuration->ap_extended && (ap_domain_index > 15))
1209 * We want to use a single domain. Either the one specified with
1210 * the "domain=" parameter or the domain with the maximum number
1213 if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS)
1214 /* Domain has already been selected. */
1218 for (i = 0; i < AP_DOMAINS; i++) {
1219 if (!ap_test_config_domain(i))
1222 for (j = 0; j < AP_DEVICES; j++) {
1223 if (!ap_test_config_card_id(j))
1225 qid = AP_MKQID(j, i);
1226 rc = ap_query_queue(qid, &queue_depth, &device_type);
1231 if (count > max_count) {
1236 if (best_domain >= 0){
1237 ap_domain_index = best_domain;
1244 * ap_probe_device_type(): Find the device type of an AP.
1245 * @ap_dev: pointer to the AP device.
1247 * Find the device type if query queue returned a device type of 0.
1249 static int ap_probe_device_type(struct ap_device *ap_dev)
1251 static unsigned char msg[] = {
1252 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,
1253 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1254 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00,
1255 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1256 0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50,
1257 0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01,
1258 0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00,
1259 0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00,
1260 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1261 0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00,
1262 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1263 0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00,
1264 0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00,
1265 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1266 0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00,
1267 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1268 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1269 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1270 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1271 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1272 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1273 0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00,
1274 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
1275 0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00,
1276 0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20,
1277 0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53,
1278 0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22,
1279 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00,
1280 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,
1281 0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66,
1282 0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44,
1283 0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22,
1284 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00,
1285 0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77,
1286 0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00,
1287 0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00,
1288 0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01,
1289 0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c,
1290 0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68,
1291 0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66,
1292 0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0,
1293 0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8,
1294 0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04,
1295 0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57,
1296 0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d,
1298 struct ap_queue_status status;
1299 unsigned long long psmid;
1303 reply = (void *) get_zeroed_page(GFP_KERNEL);
1309 status = __ap_send(ap_dev->qid, 0x0102030405060708ULL,
1310 msg, sizeof(msg), 0);
1311 if (status.response_code != AP_RESPONSE_NORMAL) {
1316 /* Wait for the test message to complete. */
1317 for (i = 0; i < 6; i++) {
1319 status = __ap_recv(ap_dev->qid, &psmid, reply, 4096);
1320 if (status.response_code == AP_RESPONSE_NORMAL &&
1321 psmid == 0x0102030405060708ULL)
1325 /* Got an answer. */
1326 if (reply[0] == 0x00 && reply[1] == 0x86)
1327 ap_dev->device_type = AP_DEVICE_TYPE_PCICC;
1329 ap_dev->device_type = AP_DEVICE_TYPE_PCICA;
1335 free_page((unsigned long) reply);
1340 static void ap_interrupt_handler(struct airq_struct *airq)
1342 inc_irq_stat(IRQIO_APB);
1343 tasklet_schedule(&ap_tasklet);
1347 * __ap_scan_bus(): Scan the AP bus.
1348 * @dev: Pointer to device
1349 * @data: Pointer to data
1351 * Scan the AP bus for new devices.
1353 static int __ap_scan_bus(struct device *dev, void *data)
1355 return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data;
1358 static void ap_device_release(struct device *dev)
1360 struct ap_device *ap_dev = to_ap_dev(dev);
1365 static void ap_scan_bus(struct work_struct *unused)
1367 struct ap_device *ap_dev;
1370 int queue_depth, device_type;
1371 unsigned int device_functions;
1374 ap_query_configuration();
1375 if (ap_select_domain() != 0) {
1378 for (i = 0; i < AP_DEVICES; i++) {
1379 qid = AP_MKQID(i, ap_domain_index);
1380 dev = bus_find_device(&ap_bus_type, NULL,
1381 (void *)(unsigned long)qid,
1383 if (ap_test_config_card_id(i))
1384 rc = ap_query_queue(qid, &queue_depth, &device_type);
1389 set_current_state(TASK_UNINTERRUPTIBLE);
1390 schedule_timeout(AP_RESET_TIMEOUT);
1391 rc = ap_query_queue(qid, &queue_depth,
1394 ap_dev = to_ap_dev(dev);
1395 spin_lock_bh(&ap_dev->lock);
1396 if (rc || ap_dev->unregistered) {
1397 spin_unlock_bh(&ap_dev->lock);
1398 if (ap_dev->unregistered)
1400 device_unregister(dev);
1404 spin_unlock_bh(&ap_dev->lock);
1410 rc = ap_init_queue(qid);
1413 ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL);
1417 ap_dev->queue_depth = queue_depth;
1418 ap_dev->unregistered = 1;
1419 spin_lock_init(&ap_dev->lock);
1420 INIT_LIST_HEAD(&ap_dev->pendingq);
1421 INIT_LIST_HEAD(&ap_dev->requestq);
1422 INIT_LIST_HEAD(&ap_dev->list);
1423 setup_timer(&ap_dev->timeout, ap_request_timeout,
1424 (unsigned long) ap_dev);
1425 switch (device_type) {
1427 /* device type probing for old cards */
1428 if (ap_probe_device_type(ap_dev)) {
1434 ap_dev->device_type = 10;
1437 ap_dev->device_type = device_type;
1439 ap_dev->raw_hwtype = device_type;
1441 rc = ap_query_functions(qid, &device_functions);
1443 ap_dev->functions = device_functions;
1445 ap_dev->functions = 0u;
1447 ap_dev->device.bus = &ap_bus_type;
1448 ap_dev->device.parent = ap_root_device;
1449 if (dev_set_name(&ap_dev->device, "card%02x",
1450 AP_QID_DEVICE(ap_dev->qid))) {
1454 ap_dev->device.release = ap_device_release;
1455 rc = device_register(&ap_dev->device);
1457 put_device(&ap_dev->device);
1460 /* Add device attributes. */
1461 rc = sysfs_create_group(&ap_dev->device.kobj,
1462 &ap_dev_attr_group);
1464 spin_lock_bh(&ap_dev->lock);
1465 ap_dev->unregistered = 0;
1466 spin_unlock_bh(&ap_dev->lock);
1469 device_unregister(&ap_dev->device);
1474 ap_config_timeout(unsigned long ptr)
1476 queue_work(ap_work_queue, &ap_config_work);
1477 ap_config_timer.expires = jiffies + ap_config_time * HZ;
1478 add_timer(&ap_config_timer);
1482 * __ap_schedule_poll_timer(): Schedule poll timer.
1484 * Set up the timer to run the poll tasklet
1486 static inline void __ap_schedule_poll_timer(void)
1490 spin_lock_bh(&ap_poll_timer_lock);
1491 if (hrtimer_is_queued(&ap_poll_timer) || ap_suspend_flag)
1493 if (ktime_to_ns(hrtimer_expires_remaining(&ap_poll_timer)) <= 0) {
1494 hr_time = ktime_set(0, poll_timeout);
1495 hrtimer_forward_now(&ap_poll_timer, hr_time);
1496 hrtimer_restart(&ap_poll_timer);
1499 spin_unlock_bh(&ap_poll_timer_lock);
1503 * ap_schedule_poll_timer(): Schedule poll timer.
1505 * Set up the timer to run the poll tasklet
1507 static inline void ap_schedule_poll_timer(void)
1509 if (ap_using_interrupts())
1511 __ap_schedule_poll_timer();
1515 * ap_poll_read(): Receive pending reply messages from an AP device.
1516 * @ap_dev: pointer to the AP device
1517 * @flags: pointer to control flags, bit 2^0 is set if another poll is
1518 * required, bit 2^1 is set if the poll timer needs to get armed
1520 * Returns 0 if the device is still present, -ENODEV if not.
1522 static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags)
1524 struct ap_queue_status status;
1525 struct ap_message *ap_msg;
1527 if (ap_dev->queue_count <= 0)
1529 status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid,
1530 ap_dev->reply->message, ap_dev->reply->length);
1531 switch (status.response_code) {
1532 case AP_RESPONSE_NORMAL:
1533 atomic_dec(&ap_poll_requests);
1534 ap_decrease_queue_count(ap_dev);
1535 list_for_each_entry(ap_msg, &ap_dev->pendingq, list) {
1536 if (ap_msg->psmid != ap_dev->reply->psmid)
1538 list_del_init(&ap_msg->list);
1539 ap_dev->pendingq_count--;
1540 ap_msg->receive(ap_dev, ap_msg, ap_dev->reply);
1543 if (ap_dev->queue_count > 0)
1546 case AP_RESPONSE_NO_PENDING_REPLY:
1547 if (status.queue_empty) {
1548 /* The card shouldn't forget requests but who knows. */
1549 atomic_sub(ap_dev->queue_count, &ap_poll_requests);
1550 ap_dev->queue_count = 0;
1551 list_splice_init(&ap_dev->pendingq, &ap_dev->requestq);
1552 ap_dev->requestq_count += ap_dev->pendingq_count;
1553 ap_dev->pendingq_count = 0;
1564 * ap_poll_write(): Send messages from the request queue to an AP device.
1565 * @ap_dev: pointer to the AP device
1566 * @flags: pointer to control flags, bit 2^0 is set if another poll is
1567 * required, bit 2^1 is set if the poll timer needs to get armed
1569 * Returns 0 if the device is still present, -ENODEV if not.
1571 static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags)
1573 struct ap_queue_status status;
1574 struct ap_message *ap_msg;
1576 if (ap_dev->requestq_count <= 0 ||
1577 ap_dev->queue_count >= ap_dev->queue_depth)
1579 /* Start the next request on the queue. */
1580 ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list);
1581 status = __ap_send(ap_dev->qid, ap_msg->psmid,
1582 ap_msg->message, ap_msg->length, ap_msg->special);
1583 switch (status.response_code) {
1584 case AP_RESPONSE_NORMAL:
1585 atomic_inc(&ap_poll_requests);
1586 ap_increase_queue_count(ap_dev);
1587 list_move_tail(&ap_msg->list, &ap_dev->pendingq);
1588 ap_dev->requestq_count--;
1589 ap_dev->pendingq_count++;
1590 if (ap_dev->queue_count < ap_dev->queue_depth &&
1591 ap_dev->requestq_count > 0)
1595 case AP_RESPONSE_RESET_IN_PROGRESS:
1596 __ap_schedule_poll_timer();
1597 case AP_RESPONSE_Q_FULL:
1600 case AP_RESPONSE_MESSAGE_TOO_BIG:
1601 case AP_RESPONSE_REQ_FAC_NOT_INST:
1610 * ap_poll_queue(): Poll AP device for pending replies and send new messages.
1611 * @ap_dev: pointer to the bus device
1612 * @flags: pointer to control flags, bit 2^0 is set if another poll is
1613 * required, bit 2^1 is set if the poll timer needs to get armed
1615 * Poll AP device for pending replies and send new messages. If either
1616 * ap_poll_read or ap_poll_write returns -ENODEV unregister the device.
1619 static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags)
1623 rc = ap_poll_read(ap_dev, flags);
1626 return ap_poll_write(ap_dev, flags);
1630 * __ap_queue_message(): Queue a message to a device.
1631 * @ap_dev: pointer to the AP device
1632 * @ap_msg: the message to be queued
1634 * Queue a message to a device. Returns 0 if successful.
1636 static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
1638 struct ap_queue_status status;
1640 if (list_empty(&ap_dev->requestq) &&
1641 ap_dev->queue_count < ap_dev->queue_depth) {
1642 status = __ap_send(ap_dev->qid, ap_msg->psmid,
1643 ap_msg->message, ap_msg->length,
1645 switch (status.response_code) {
1646 case AP_RESPONSE_NORMAL:
1647 list_add_tail(&ap_msg->list, &ap_dev->pendingq);
1648 atomic_inc(&ap_poll_requests);
1649 ap_dev->pendingq_count++;
1650 ap_increase_queue_count(ap_dev);
1651 ap_dev->total_request_count++;
1653 case AP_RESPONSE_Q_FULL:
1654 case AP_RESPONSE_RESET_IN_PROGRESS:
1655 list_add_tail(&ap_msg->list, &ap_dev->requestq);
1656 ap_dev->requestq_count++;
1657 ap_dev->total_request_count++;
1659 case AP_RESPONSE_REQ_FAC_NOT_INST:
1660 case AP_RESPONSE_MESSAGE_TOO_BIG:
1661 ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL));
1663 default: /* Device is gone. */
1664 ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
1668 list_add_tail(&ap_msg->list, &ap_dev->requestq);
1669 ap_dev->requestq_count++;
1670 ap_dev->total_request_count++;
1673 ap_schedule_poll_timer();
1677 void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
1679 unsigned long flags;
1682 /* For asynchronous message handling a valid receive-callback
1684 BUG_ON(!ap_msg->receive);
1686 spin_lock_bh(&ap_dev->lock);
1687 if (!ap_dev->unregistered) {
1688 /* Make room on the queue by polling for finished requests. */
1689 rc = ap_poll_queue(ap_dev, &flags);
1691 rc = __ap_queue_message(ap_dev, ap_msg);
1693 wake_up(&ap_poll_wait);
1695 ap_dev->unregistered = 1;
1697 ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
1700 spin_unlock_bh(&ap_dev->lock);
1702 device_unregister(&ap_dev->device);
1704 EXPORT_SYMBOL(ap_queue_message);
1707 * ap_cancel_message(): Cancel a crypto request.
1708 * @ap_dev: The AP device that has the message queued
1709 * @ap_msg: The message that is to be removed
1711 * Cancel a crypto request. This is done by removing the request
1712 * from the device pending or request queue. Note that the
1713 * request stays on the AP queue. When it finishes the message
1714 * reply will be discarded because the psmid can't be found.
1716 void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
1718 struct ap_message *tmp;
1720 spin_lock_bh(&ap_dev->lock);
1721 if (!list_empty(&ap_msg->list)) {
1722 list_for_each_entry(tmp, &ap_dev->pendingq, list)
1723 if (tmp->psmid == ap_msg->psmid) {
1724 ap_dev->pendingq_count--;
1727 ap_dev->requestq_count--;
1729 list_del_init(&ap_msg->list);
1731 spin_unlock_bh(&ap_dev->lock);
1733 EXPORT_SYMBOL(ap_cancel_message);
1736 * ap_poll_timeout(): AP receive polling for finished AP requests.
1737 * @unused: Unused pointer.
1739 * Schedules the AP tasklet using a high resolution timer.
1741 static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused)
1743 tasklet_schedule(&ap_tasklet);
1744 return HRTIMER_NORESTART;
1748 * ap_reset(): Reset a not responding AP device.
1749 * @ap_dev: Pointer to the AP device
1751 * Reset a not responding AP device and move all requests from the
1752 * pending queue to the request queue.
1754 static void ap_reset(struct ap_device *ap_dev)
1758 ap_dev->reset = AP_RESET_IGNORE;
1759 atomic_sub(ap_dev->queue_count, &ap_poll_requests);
1760 ap_dev->queue_count = 0;
1761 list_splice_init(&ap_dev->pendingq, &ap_dev->requestq);
1762 ap_dev->requestq_count += ap_dev->pendingq_count;
1763 ap_dev->pendingq_count = 0;
1764 rc = ap_init_queue(ap_dev->qid);
1766 ap_dev->unregistered = 1;
1768 __ap_schedule_poll_timer();
1771 static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags)
1773 if (!ap_dev->unregistered) {
1774 if (ap_poll_queue(ap_dev, flags))
1775 ap_dev->unregistered = 1;
1776 if (ap_dev->reset == AP_RESET_DO)
1783 * ap_poll_all(): Poll all AP devices.
1784 * @dummy: Unused variable
1786 * Poll all AP devices on the bus in a round robin fashion. Continue
1787 * polling until bit 2^0 of the control flags is not set. If bit 2^1
1788 * of the control flags has been set arm the poll timer.
1790 static void ap_poll_all(unsigned long dummy)
1792 unsigned long flags;
1793 struct ap_device *ap_dev;
1795 /* Reset the indicator if interrupts are used. Thus new interrupts can
1796 * be received. Doing it in the beginning of the tasklet is therefor
1797 * important that no requests on any AP get lost.
1799 if (ap_using_interrupts())
1800 xchg(ap_airq.lsi_ptr, 0);
1803 spin_lock(&ap_device_list_lock);
1804 list_for_each_entry(ap_dev, &ap_device_list, list) {
1805 spin_lock(&ap_dev->lock);
1806 __ap_poll_device(ap_dev, &flags);
1807 spin_unlock(&ap_dev->lock);
1809 spin_unlock(&ap_device_list_lock);
1810 } while (flags & 1);
1812 ap_schedule_poll_timer();
1816 * ap_poll_thread(): Thread that polls for finished requests.
1817 * @data: Unused pointer
1819 * AP bus poll thread. The purpose of this thread is to poll for
1820 * finished requests in a loop if there is a "free" cpu - that is
1821 * a cpu that doesn't have anything better to do. The polling stops
1822 * as soon as there is another task or if all messages have been
1825 static int ap_poll_thread(void *data)
1827 DECLARE_WAITQUEUE(wait, current);
1828 unsigned long flags;
1830 struct ap_device *ap_dev;
1832 set_user_nice(current, MAX_NICE);
1834 if (ap_suspend_flag)
1836 if (need_resched()) {
1840 add_wait_queue(&ap_poll_wait, &wait);
1841 set_current_state(TASK_INTERRUPTIBLE);
1842 if (kthread_should_stop())
1844 requests = atomic_read(&ap_poll_requests);
1847 set_current_state(TASK_RUNNING);
1848 remove_wait_queue(&ap_poll_wait, &wait);
1851 spin_lock_bh(&ap_device_list_lock);
1852 list_for_each_entry(ap_dev, &ap_device_list, list) {
1853 spin_lock(&ap_dev->lock);
1854 __ap_poll_device(ap_dev, &flags);
1855 spin_unlock(&ap_dev->lock);
1857 spin_unlock_bh(&ap_device_list_lock);
1859 set_current_state(TASK_RUNNING);
1860 remove_wait_queue(&ap_poll_wait, &wait);
1864 static int ap_poll_thread_start(void)
1868 if (ap_using_interrupts() || ap_suspend_flag)
1870 mutex_lock(&ap_poll_thread_mutex);
1871 if (!ap_poll_kthread) {
1872 ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
1873 rc = PTR_RET(ap_poll_kthread);
1875 ap_poll_kthread = NULL;
1879 mutex_unlock(&ap_poll_thread_mutex);
1883 static void ap_poll_thread_stop(void)
1885 mutex_lock(&ap_poll_thread_mutex);
1886 if (ap_poll_kthread) {
1887 kthread_stop(ap_poll_kthread);
1888 ap_poll_kthread = NULL;
1890 mutex_unlock(&ap_poll_thread_mutex);
1894 * ap_request_timeout(): Handling of request timeouts
1895 * @data: Holds the AP device.
1897 * Handles request timeouts.
1899 static void ap_request_timeout(unsigned long data)
1901 struct ap_device *ap_dev = (struct ap_device *) data;
1903 if (ap_dev->reset == AP_RESET_ARMED) {
1904 ap_dev->reset = AP_RESET_DO;
1906 if (ap_using_interrupts())
1907 tasklet_schedule(&ap_tasklet);
1911 static void ap_reset_domain(void)
1915 if (ap_domain_index != -1)
1916 for (i = 0; i < AP_DEVICES; i++)
1917 ap_reset_queue(AP_MKQID(i, ap_domain_index));
1920 static void ap_reset_all(void)
1924 for (i = 0; i < AP_DOMAINS; i++) {
1925 if (!ap_test_config_domain(i))
1927 for (j = 0; j < AP_DEVICES; j++) {
1928 if (!ap_test_config_card_id(j))
1930 ap_reset_queue(AP_MKQID(j, i));
1935 static struct reset_call ap_reset_call = {
1940 * ap_module_init(): The module initialization code.
1942 * Initializes the module.
1944 int __init ap_module_init(void)
1948 if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) {
1949 pr_warning("%d is not a valid cryptographic domain\n",
1953 /* In resume callback we need to know if the user had set the domain.
1954 * If so, we can not just reset it.
1956 if (ap_domain_index >= 0)
1957 user_set_domain = 1;
1959 if (ap_instructions_available() != 0) {
1960 pr_warning("The hardware system does not support "
1961 "AP instructions\n");
1964 if (ap_interrupts_available()) {
1965 rc = register_adapter_interrupt(&ap_airq);
1966 ap_airq_flag = (rc == 0);
1969 register_reset_call(&ap_reset_call);
1971 /* Create /sys/bus/ap. */
1972 rc = bus_register(&ap_bus_type);
1975 for (i = 0; ap_bus_attrs[i]; i++) {
1976 rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]);
1981 /* Create /sys/devices/ap. */
1982 ap_root_device = root_device_register("ap");
1983 rc = PTR_RET(ap_root_device);
1987 ap_work_queue = create_singlethread_workqueue("kapwork");
1988 if (!ap_work_queue) {
1993 ap_query_configuration();
1994 if (ap_select_domain() == 0)
1997 /* Setup the AP bus rescan timer. */
1998 init_timer(&ap_config_timer);
1999 ap_config_timer.function = ap_config_timeout;
2000 ap_config_timer.data = 0;
2001 ap_config_timer.expires = jiffies + ap_config_time * HZ;
2002 add_timer(&ap_config_timer);
2004 /* Setup the high resultion poll timer.
2005 * If we are running under z/VM adjust polling to z/VM polling rate.
2008 poll_timeout = 1500000;
2009 spin_lock_init(&ap_poll_timer_lock);
2010 hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
2011 ap_poll_timer.function = ap_poll_timeout;
2013 /* Start the low priority AP bus poll thread. */
2014 if (ap_thread_flag) {
2015 rc = ap_poll_thread_start();
2023 del_timer_sync(&ap_config_timer);
2024 hrtimer_cancel(&ap_poll_timer);
2025 destroy_workqueue(ap_work_queue);
2027 root_device_unregister(ap_root_device);
2030 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
2031 bus_unregister(&ap_bus_type);
2033 unregister_reset_call(&ap_reset_call);
2034 if (ap_using_interrupts())
2035 unregister_adapter_interrupt(&ap_airq);
2039 static int __ap_match_all(struct device *dev, void *data)
2045 * ap_modules_exit(): The module termination code
2047 * Terminates the module.
2049 void ap_module_exit(void)
2055 ap_poll_thread_stop();
2056 del_timer_sync(&ap_config_timer);
2057 hrtimer_cancel(&ap_poll_timer);
2058 destroy_workqueue(ap_work_queue);
2059 tasklet_kill(&ap_tasklet);
2060 root_device_unregister(ap_root_device);
2061 while ((dev = bus_find_device(&ap_bus_type, NULL, NULL,
2064 device_unregister(dev);
2067 for (i = 0; ap_bus_attrs[i]; i++)
2068 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
2069 bus_unregister(&ap_bus_type);
2070 unregister_reset_call(&ap_reset_call);
2071 if (ap_using_interrupts())
2072 unregister_adapter_interrupt(&ap_airq);
2075 module_init(ap_module_init);
2076 module_exit(ap_module_exit);