diff options
Diffstat (limited to 'drivers/s390/crypto/ap_bus.c')
| -rw-r--r-- | drivers/s390/crypto/ap_bus.c | 972 |
1 files changed, 832 insertions, 140 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c index 7b0b8190129..4038437ff03 100644 --- a/drivers/s390/crypto/ap_bus.c +++ b/drivers/s390/crypto/ap_bus.c @@ -1,10 +1,10 @@ /* - * linux/drivers/s390/crypto/ap_bus.c - * - * Copyright (C) 2006 IBM Corporation + * Copyright IBM Corp. 2006, 2012 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> * Martin Schwidefsky <schwidefsky@de.ibm.com> * Ralph Wuerthner <rwuerthn@de.ibm.com> + * Felix Beck <felix.beck@de.ibm.com> + * Holger Dengler <hd@linux.vnet.ibm.com> * * Adjunct processor bus. * @@ -23,53 +23,74 @@ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +#define KMSG_COMPONENT "ap" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/kernel_stat.h> #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/slab.h> #include <linux/notifier.h> #include <linux/kthread.h> #include <linux/mutex.h> -#include <asm/s390_rdev.h> #include <asm/reset.h> +#include <asm/airq.h> +#include <linux/atomic.h> +#include <asm/isc.h> +#include <linux/hrtimer.h> +#include <linux/ktime.h> +#include <asm/facility.h> #include "ap_bus.h" /* Some prototypes. */ static void ap_scan_bus(struct work_struct *); static void ap_poll_all(unsigned long); -static void ap_poll_timeout(unsigned long); +static enum hrtimer_restart ap_poll_timeout(struct hrtimer *); static int ap_poll_thread_start(void); static void ap_poll_thread_stop(void); static void ap_request_timeout(unsigned long); +static inline void ap_schedule_poll_timer(void); +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(struct airq_struct *airq); +static void ap_reset(struct ap_device *ap_dev); +static void ap_config_timeout(unsigned long ptr); +static int ap_select_domain(void); +static void ap_query_configuration(void); -/** +/* * Module description. */ MODULE_AUTHOR("IBM Corporation"); -MODULE_DESCRIPTION("Adjunct Processor Bus driver, " - "Copyright 2006 IBM Corporation"); +MODULE_DESCRIPTION("Adjunct Processor Bus driver, " \ + "Copyright IBM Corp. 2006, 2012"); MODULE_LICENSE("GPL"); +MODULE_ALIAS("z90crypt"); -/** +/* * Module parameter */ int ap_domain_index = -1; /* Adjunct Processor Domain Index */ -module_param_named(domain, ap_domain_index, int, 0000); +module_param_named(domain, ap_domain_index, int, S_IRUSR|S_IRGRP); MODULE_PARM_DESC(domain, "domain index for ap devices"); EXPORT_SYMBOL(ap_domain_index); static int ap_thread_flag = 0; -module_param_named(poll_thread, ap_thread_flag, int, 0000); +module_param_named(poll_thread, ap_thread_flag, int, S_IRUSR|S_IRGRP); MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); static struct device *ap_root_device = NULL; -static DEFINE_SPINLOCK(ap_device_lock); +static struct ap_config_info *ap_configuration; +static DEFINE_SPINLOCK(ap_device_list_lock); static LIST_HEAD(ap_device_list); -/** +/* * Workqueue & timer for bus rescan. */ static struct workqueue_struct *ap_work_queue; @@ -77,20 +98,49 @@ static struct timer_list ap_config_timer; static int ap_config_time = AP_CONFIG_TIME; static DECLARE_WORK(ap_config_work, ap_scan_bus); -/** - * Tasklet & timer for AP request polling. +/* + * Tasklet & timer for AP request polling and interrupts */ -static struct timer_list ap_poll_timer = TIMER_INITIALIZER(ap_poll_timeout,0,0); 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); +static DEFINE_SPINLOCK(ap_poll_timer_lock); +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; + +/* Suspend flag */ +static int ap_suspend_flag; +/* 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; +static struct bus_type ap_bus_type; + +/* Adapter interrupt definitions */ +static int ap_airq_flag; + +static struct airq_struct ap_airq = { + .handler = ap_interrupt_handler, + .isc = AP_ISC, +}; /** - * Test if ap instructions are available. + * ap_using_interrupts() - Returns non-zero if interrupt support is + * available. + */ +static inline int ap_using_interrupts(void) +{ + return ap_airq_flag; +} + +/** + * ap_intructions_available() - Test if AP instructions are available. * - * Returns 0 if the ap instructions are installed. + * Returns 0 if the AP instructions are installed. */ static inline int ap_instructions_available(void) { @@ -108,12 +158,35 @@ static inline int ap_instructions_available(void) } /** - * Test adjunct processor queue. - * @qid: the ap queue number - * @queue_depth: pointer to queue depth value - * @device_type: pointer to device type value + * ap_interrupts_available(): Test if AP interrupts are available. + * + * Returns 1 if AP interrupts are available. + */ +static int ap_interrupts_available(void) +{ + return test_facility(2) && test_facility(65); +} + +/** + * ap_configuration_available(): Test if AP configuration + * information is available. * - * Returns ap queue status structure. + * Returns 1 if AP configuration information is available. + */ +#ifdef CONFIG_64BIT +static int ap_configuration_available(void) +{ + return test_facility(2) && test_facility(12); +} +#endif + +/** + * 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 + * + * Returns AP queue status structure. */ static inline struct ap_queue_status ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type) @@ -130,10 +203,10 @@ ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type) } /** - * Reset adjunct processor queue. - * @qid: the ap queue number + * ap_reset_queue(): Reset adjunct processor queue. + * @qid: The AP queue number * - * Returns ap queue status structure. + * Returns AP queue status structure. */ static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) { @@ -147,22 +220,192 @@ static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) return reg1; } +#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(AQIC) */ + : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) + : + : "cc" ); + return reg1_out; +} +#endif + +#ifdef CONFIG_64BIT +static inline struct ap_queue_status +__ap_query_functions(ap_qid_t qid, unsigned int *functions) +{ + register unsigned long reg0 asm ("0") = 0UL | qid | (1UL << 23); + register struct ap_queue_status reg1 asm ("1") = AP_QUEUE_STATUS_INVALID; + register unsigned long reg2 asm ("2"); + + asm volatile( + ".long 0xb2af0000\n" /* PQAP(TAPQ) */ + "0:\n" + EX_TABLE(0b, 0b) + : "+d" (reg0), "+d" (reg1), "=d" (reg2) + : + : "cc"); + + *functions = (unsigned int)(reg2 >> 32); + return reg1; +} +#endif + +#ifdef CONFIG_64BIT +static inline int __ap_query_configuration(struct ap_config_info *config) +{ + register unsigned long reg0 asm ("0") = 0x04000000UL; + register unsigned long reg1 asm ("1") = -EINVAL; + register unsigned char *reg2 asm ("2") = (unsigned char *)config; + + asm volatile( + ".long 0xb2af0000\n" /* PQAP(QCI) */ + "0: la %1,0\n" + "1:\n" + EX_TABLE(0b, 1b) + : "+d" (reg0), "+d" (reg1), "+d" (reg2) + : + : "cc"); + + return reg1; +} +#endif + /** - * 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 + * ap_query_functions(): Query supported functions. + * @qid: The AP queue number + * @functions: Pointer to functions field. * - * Returns ap queue status structure. + * Returns + * 0 on success. + * -ENODEV if queue not valid. + * -EBUSY if device busy. + * -EINVAL if query function is not supported + */ +static int ap_query_functions(ap_qid_t qid, unsigned int *functions) +{ +#ifdef CONFIG_64BIT + struct ap_queue_status status; + int i; + status = __ap_query_functions(qid, functions); + + for (i = 0; i < AP_MAX_RESET; i++) { + if (ap_queue_status_invalid_test(&status)) + return -ENODEV; + + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + return 0; + 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: + break; + default: + break; + } + if (i < AP_MAX_RESET - 1) { + udelay(5); + status = __ap_query_functions(qid, functions); + } + } + return -EBUSY; +#else + return -EINVAL; +#endif +} + +/** + * ap_queue_enable_interruption(): Enable interruption on an AP. + * @qid: The AP queue number + * @ind: the notification indicator byte * - * Condition code 1 on NQAP can't happen because the L bit is 1. + * 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: + if (i < AP_MAX_RESET - 1) { + udelay(5); + status = ap_queue_interruption_control(qid, + ind); + continue; + } + 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 +} + +/** + * __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 + * @special: Special Bit * + * Returns AP queue status structure. + * 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 -__ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) +__ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, + unsigned int special) { typedef struct { char _[length]; } msgblock; register unsigned long reg0 asm ("0") = qid | 0x40000000UL; @@ -170,10 +413,13 @@ __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) 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; + register unsigned long reg5 asm ("5") = psmid & 0xffffffff; + + if (special == 1) + reg0 |= 0x400000UL; asm volatile ( - "0: .long 0xb2ad0042\n" /* DQAP */ + "0: .long 0xb2ad0042\n" /* NQAP */ " brc 2,0b" : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) @@ -185,36 +431,35 @@ int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) { struct ap_queue_status status; - status = __ap_send(qid, psmid, msg, length); + status = __ap_send(qid, psmid, msg, length, 0); switch (status.response_code) { case AP_RESPONSE_NORMAL: return 0; case AP_RESPONSE_Q_FULL: case AP_RESPONSE_RESET_IN_PROGRESS: return -EBUSY; + case AP_RESPONSE_REQ_FAC_NOT_INST: + return -EINVAL; default: /* Device is gone. */ return -ENODEV; } } EXPORT_SYMBOL(ap_send); -/* - * 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 - * - * Returns ap queue status structure. +/** + * __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 * + * Returns AP queue status structure. * 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. @@ -233,7 +478,7 @@ __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) asm volatile( - "0: .long 0xb2ae0064\n" + "0: .long 0xb2ae0064\n" /* DQAP */ " brc 6,0b\n" : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), @@ -263,11 +508,12 @@ int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) EXPORT_SYMBOL(ap_recv); /** - * Check if an AP queue is available. The test is repeated for - * AP_MAX_RESET times. - * @qid: the ap queue number - * @queue_depth: pointer to queue depth value - * @device_type: pointer to device type value + * 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. */ static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) { @@ -294,6 +540,11 @@ static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) case AP_RESPONSE_CHECKSTOPPED: rc = -ENODEV; break; + case AP_RESPONSE_INVALID_ADDRESS: + rc = -ENODEV; + break; + case AP_RESPONSE_OTHERWISE_CHANGED: + break; case AP_RESPONSE_BUSY: break; default: @@ -308,8 +559,10 @@ static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) } /** + * ap_init_queue(): Reset an AP queue. + * @qid: The AP queue number + * * Reset an AP queue and wait for it to become available again. - * @qid: the ap queue number */ static int ap_init_queue(ap_qid_t qid) { @@ -338,15 +591,33 @@ static int ap_init_queue(ap_qid_t qid) if (rc != -ENODEV && rc != -EBUSY) break; if (i < AP_MAX_RESET - 1) { - udelay(5); + /* Time we are waiting until we give up (0.7sec * 90). + * Since the actual request (in progress) will not + * interrupted immediately for the reset command, + * we have to be patient. In worst case we have to + * wait 60sec + reset time (some msec). + */ + schedule_timeout(AP_RESET_TIMEOUT); status = ap_test_queue(qid, &dummy, &dummy); } } + if (rc == 0 && ap_using_interrupts()) { + rc = ap_queue_enable_interruption(qid, ap_airq.lsi_ptr); + /* 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)); + } return rc; } /** - * Arm request timeout if a AP device was idle and a new request is submitted. + * 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. */ static void ap_increase_queue_count(struct ap_device *ap_dev) { @@ -360,7 +631,10 @@ static void ap_increase_queue_count(struct ap_device *ap_dev) } /** - * AP device is still alive, re-schedule request timeout if there are still + * 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 * pending requests. */ static void ap_decrease_queue_count(struct ap_device *ap_dev) @@ -371,7 +645,7 @@ static void ap_decrease_queue_count(struct ap_device *ap_dev) if (ap_dev->queue_count > 0) mod_timer(&ap_dev->timeout, jiffies + timeout); else - /** + /* * 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. @@ -379,7 +653,7 @@ static void ap_decrease_queue_count(struct ap_device *ap_dev) ap_dev->reset = AP_RESET_IGNORE; } -/** +/* * AP device related attributes. */ static ssize_t ap_hwtype_show(struct device *dev, @@ -388,16 +662,16 @@ static ssize_t ap_hwtype_show(struct device *dev, struct ap_device *ap_dev = to_ap_dev(dev); return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); } -static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); +static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); 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); } -static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); +static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); static ssize_t ap_request_count_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -413,6 +687,34 @@ static ssize_t ap_request_count_show(struct device *dev, static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); +static ssize_t ap_requestq_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->requestq_count); + spin_unlock_bh(&ap_dev->lock); + return rc; +} + +static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL); + +static ssize_t ap_pendingq_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->pendingq_count); + spin_unlock_bh(&ap_dev->lock); + return rc; +} + +static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL); + static ssize_t ap_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -421,11 +723,23 @@ static ssize_t ap_modalias_show(struct device *dev, static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); +static ssize_t ap_functions_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ap_device *ap_dev = to_ap_dev(dev); + return snprintf(buf, PAGE_SIZE, "0x%08X\n", ap_dev->functions); +} + +static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL); + static struct attribute *ap_dev_attrs[] = { &dev_attr_hwtype.attr, &dev_attr_depth.attr, &dev_attr_request_count.attr, + &dev_attr_requestq_count.attr, + &dev_attr_pendingq_count.attr, &dev_attr_modalias.attr, + &dev_attr_ap_functions.attr, NULL }; static struct attribute_group ap_dev_attr_group = { @@ -433,6 +747,10 @@ static struct attribute_group ap_dev_attr_group = { }; /** + * ap_bus_match() + * @dev: Pointer to device + * @drv: Pointer to device_driver + * * AP bus driver registration/unregistration. */ static int ap_bus_match(struct device *dev, struct device_driver *drv) @@ -441,7 +759,7 @@ static int ap_bus_match(struct device *dev, struct device_driver *drv) struct ap_driver *ap_drv = to_ap_drv(drv); struct ap_device_id *id; - /** + /* * Compare device type of the device with the list of * supported types of the device_driver. */ @@ -455,8 +773,12 @@ static int ap_bus_match(struct device *dev, struct device_driver *drv) } /** - * uevent function for AP devices. It sets up a single environment - * variable DEV_TYPE which contains the hardware device type. + * 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. */ static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) { @@ -477,10 +799,99 @@ static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) return retval; } +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; + } + + tasklet_disable(&ap_tasklet); + } + /* Poll on the device until all requests are finished. */ + do { + flags = 0; + spin_lock_bh(&ap_dev->lock); + __ap_poll_device(ap_dev, &flags); + spin_unlock_bh(&ap_dev->lock); + } while ((flags & 1) || (flags & 2)); + + spin_lock_bh(&ap_dev->lock); + ap_dev->unregistered = 1; + spin_unlock_bh(&ap_dev->lock); + + return 0; +} + +static int ap_bus_resume(struct device *dev) +{ + struct ap_device *ap_dev = to_ap_dev(dev); + int rc; + + if (ap_suspend_flag) { + ap_suspend_flag = 0; + if (ap_interrupts_available()) { + if (!ap_using_interrupts()) { + rc = register_adapter_interrupt(&ap_airq); + ap_airq_flag = (rc == 0); + } + } else { + if (ap_using_interrupts()) { + unregister_adapter_interrupt(&ap_airq); + ap_airq_flag = 0; + } + } + ap_query_configuration(); + if (!user_set_domain) { + ap_domain_index = -1; + ap_select_domain(); + } + 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(); + else + rc = 0; + } else + rc = 0; + 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); + + return rc; +} + static struct bus_type ap_bus_type = { .name = "ap", .match = &ap_bus_match, .uevent = &ap_uevent, + .suspend = ap_bus_suspend, + .resume = ap_bus_resume }; static int ap_device_probe(struct device *dev) @@ -490,18 +901,25 @@ static int ap_device_probe(struct device *dev) int rc; ap_dev->drv = ap_drv; + + spin_lock_bh(&ap_device_list_lock); + list_add(&ap_dev->list, &ap_device_list); + spin_unlock_bh(&ap_device_list_lock); + rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; - if (!rc) { - spin_lock_bh(&ap_device_lock); - list_add(&ap_dev->list, &ap_device_list); - spin_unlock_bh(&ap_device_lock); + if (rc) { + spin_lock_bh(&ap_device_list_lock); + list_del_init(&ap_dev->list); + spin_unlock_bh(&ap_device_list_lock); } return rc; } /** + * __ap_flush_queue(): Flush requests. + * @ap_dev: Pointer to the AP device + * * Flush all requests from the request/pending queue of an AP device. - * @ap_dev: pointer to the AP device. */ static void __ap_flush_queue(struct ap_device *ap_dev) { @@ -510,12 +928,12 @@ static void __ap_flush_queue(struct ap_device *ap_dev) 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)); + ap_msg->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)); + ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); } } @@ -534,9 +952,9 @@ static int ap_device_remove(struct device *dev) ap_flush_queue(ap_dev); del_timer_sync(&ap_dev->timeout); - spin_lock_bh(&ap_device_lock); + spin_lock_bh(&ap_device_list_lock); list_del_init(&ap_dev->list); - spin_unlock_bh(&ap_device_lock); + spin_unlock_bh(&ap_device_list_lock); if (ap_drv->remove) ap_drv->remove(ap_dev); spin_lock_bh(&ap_dev->lock); @@ -565,7 +983,17 @@ void ap_driver_unregister(struct ap_driver *ap_drv) } EXPORT_SYMBOL(ap_driver_unregister); -/** +void ap_bus_force_rescan(void) +{ + /* reconfigure the AP bus rescan timer. */ + mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); + /* processing a asynchronous bus rescan */ + queue_work(ap_work_queue, &ap_config_work); + flush_work(&ap_config_work); +} +EXPORT_SYMBOL(ap_bus_force_rescan); + +/* * AP bus attributes. */ static ssize_t ap_domain_show(struct bus_type *bus, char *buf) @@ -575,11 +1003,41 @@ static ssize_t ap_domain_show(struct bus_type *bus, char *buf) static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); +static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf) +{ + if (ap_configuration != NULL) { /* QCI not supported */ + if (test_facility(76)) { /* format 1 - 256 bit domain field */ + return snprintf(buf, PAGE_SIZE, + "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", + ap_configuration->adm[0], ap_configuration->adm[1], + ap_configuration->adm[2], ap_configuration->adm[3], + ap_configuration->adm[4], ap_configuration->adm[5], + ap_configuration->adm[6], ap_configuration->adm[7]); + } else { /* format 0 - 16 bit domain field */ + return snprintf(buf, PAGE_SIZE, "%08x%08x\n", + ap_configuration->adm[0], ap_configuration->adm[1]); + } + } else { + return snprintf(buf, PAGE_SIZE, "not supported\n"); + } +} + +static BUS_ATTR(ap_control_domain_mask, 0444, + ap_control_domain_mask_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); } +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); + static ssize_t ap_config_time_store(struct bus_type *bus, const char *buf, size_t count) { @@ -622,22 +1080,115 @@ static ssize_t ap_poll_thread_store(struct bus_type *bus, static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); +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 */ + if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || + time > 120000000000ULL) + return -EINVAL; + poll_timeout = time; + hr_time = ktime_set(0, poll_timeout); + + if (!hrtimer_is_queued(&ap_poll_timer) || + !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); + } + return count; +} + +static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); + static struct bus_attribute *const ap_bus_attrs[] = { &bus_attr_ap_domain, + &bus_attr_ap_control_domain_mask, &bus_attr_config_time, &bus_attr_poll_thread, - NULL + &bus_attr_ap_interrupts, + &bus_attr_poll_timeout, + NULL, }; +static inline int ap_test_config(unsigned int *field, unsigned int nr) +{ + if (nr > 0xFFu) + return 0; + return ap_test_bit((field + (nr >> 5)), (nr & 0x1f)); +} + +/* + * ap_test_config_card_id(): Test, whether an AP card ID is configured. + * @id AP card ID + * + * Returns 0 if the card is not configured + * 1 if the card is configured or + * if the configuration information is not available + */ +static inline int ap_test_config_card_id(unsigned int id) +{ + if (!ap_configuration) + return 1; + return ap_test_config(ap_configuration->apm, id); +} + +/* + * ap_test_config_domain(): Test, whether an AP usage domain is configured. + * @domain AP usage domain ID + * + * Returns 0 if the usage domain is not configured + * 1 if the usage domain is configured or + * if the configuration information is not available + */ +static inline int ap_test_config_domain(unsigned int domain) +{ + if (!ap_configuration) + return 1; + return ap_test_config(ap_configuration->aqm, domain); +} + /** - * Pick one of the 16 ap domains. + * ap_query_configuration(): Query AP configuration information. + * + * Query information of installed cards and configured domains from AP. + */ +static void ap_query_configuration(void) +{ +#ifdef CONFIG_64BIT + if (ap_configuration_available()) { + if (!ap_configuration) + ap_configuration = + kzalloc(sizeof(struct ap_config_info), + GFP_KERNEL); + if (ap_configuration) + __ap_query_configuration(ap_configuration); + } else + ap_configuration = NULL; +#else + ap_configuration = NULL; +#endif +} + +/** + * ap_select_domain(): Select an AP domain. + * + * Pick one of the 16 AP domains. */ static int ap_select_domain(void) { int queue_depth, device_type, count, max_count, best_domain; + ap_qid_t qid; int rc, i, j; - /** + /* * We want to use a single domain. Either the one specified with * the "domain=" parameter or the domain with the maximum number * of devices. @@ -648,9 +1199,13 @@ static int ap_select_domain(void) best_domain = -1; max_count = 0; for (i = 0; i < AP_DOMAINS; i++) { + if (!ap_test_config_domain(i)) + continue; count = 0; for (j = 0; j < AP_DEVICES; j++) { - ap_qid_t qid = AP_MKQID(j, i); + if (!ap_test_config_card_id(j)) + continue; + qid = AP_MKQID(j, i); rc = ap_query_queue(qid, &queue_depth, &device_type); if (rc) continue; @@ -669,8 +1224,10 @@ static int ap_select_domain(void) } /** - * Find the device type if query queue returned a device type of 0. + * ap_probe_device_type(): Find the device type of an AP. * @ap_dev: pointer to the AP device. + * + * Find the device type if query queue returned a device type of 0. */ static int ap_probe_device_type(struct ap_device *ap_dev) { @@ -733,7 +1290,7 @@ static int ap_probe_device_type(struct ap_device *ap_dev) } status = __ap_send(ap_dev->qid, 0x0102030405060708ULL, - msg, sizeof(msg)); + msg, sizeof(msg), 0); if (status.response_code != AP_RESPONSE_NORMAL) { rc = -ENODEV; goto out_free; @@ -763,8 +1320,18 @@ out: return rc; } +static void ap_interrupt_handler(struct airq_struct *airq) +{ + inc_irq_stat(IRQIO_APB); + tasklet_schedule(&ap_tasklet); +} + /** - * Scan the ap bus for new devices. + * __ap_scan_bus(): Scan the AP bus. + * @dev: Pointer to device + * @data: Pointer to data + * + * Scan the AP bus for new devices. */ static int __ap_scan_bus(struct device *dev, void *data) { @@ -784,16 +1351,22 @@ static void ap_scan_bus(struct work_struct *unused) struct device *dev; ap_qid_t qid; int queue_depth, device_type; + unsigned int device_functions; int rc, i; - if (ap_select_domain() != 0) + ap_query_configuration(); + 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); - rc = ap_query_queue(qid, &queue_depth, &device_type); + if (ap_test_config_card_id(i)) + rc = ap_query_queue(qid, &queue_depth, &device_type); + else + rc = -ENODEV; if (dev) { if (rc == -EBUSY) { set_current_state(TASK_UNINTERRUPTIBLE); @@ -805,6 +1378,8 @@ static void ap_scan_bus(struct work_struct *unused) spin_lock_bh(&ap_dev->lock); if (rc || ap_dev->unregistered) { spin_unlock_bh(&ap_dev->lock); + if (ap_dev->unregistered) + i--; device_unregister(dev); put_device(dev); continue; @@ -830,19 +1405,35 @@ static void ap_scan_bus(struct work_struct *unused) INIT_LIST_HEAD(&ap_dev->list); setup_timer(&ap_dev->timeout, ap_request_timeout, (unsigned long) ap_dev); - if (device_type == 0) - ap_probe_device_type(ap_dev); - else + switch (device_type) { + case 0: + /* device type probing for old cards */ + if (ap_probe_device_type(ap_dev)) { + kfree(ap_dev); + continue; + } + break; + default: ap_dev->device_type = device_type; + } + + rc = ap_query_functions(qid, &device_functions); + if (!rc) + ap_dev->functions = device_functions; + else + ap_dev->functions = 0u; ap_dev->device.bus = &ap_bus_type; ap_dev->device.parent = ap_root_device; - snprintf(ap_dev->device.bus_id, BUS_ID_SIZE, "card%02x", - AP_QID_DEVICE(ap_dev->qid)); + if (dev_set_name(&ap_dev->device, "card%02x", + AP_QID_DEVICE(ap_dev->qid))) { + kfree(ap_dev); + continue; + } ap_dev->device.release = ap_device_release; rc = device_register(&ap_dev->device); if (rc) { - kfree(ap_dev); + put_device(&ap_dev->device); continue; } /* Add device attributes. */ @@ -867,20 +1458,44 @@ ap_config_timeout(unsigned long ptr) } /** + * __ap_schedule_poll_timer(): Schedule poll timer. + * + * Set up the timer to run the poll tasklet + */ +static inline void __ap_schedule_poll_timer(void) +{ + ktime_t hr_time; + + spin_lock_bh(&ap_poll_timer_lock); + if (hrtimer_is_queued(&ap_poll_timer) || ap_suspend_flag) + goto out; + 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); + } +out: + spin_unlock_bh(&ap_poll_timer_lock); +} + +/** + * ap_schedule_poll_timer(): Schedule poll timer. + * * Set up the timer to run the poll tasklet */ static inline void ap_schedule_poll_timer(void) { - if (timer_pending(&ap_poll_timer)) + if (ap_using_interrupts()) return; - mod_timer(&ap_poll_timer, jiffies + AP_POLL_TIME); + __ap_schedule_poll_timer(); } /** - * Receive pending reply messages from an AP device. + * ap_poll_read(): Receive pending reply messages from an AP device. * @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 + * * Returns 0 if the device is still present, -ENODEV if not. */ static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) @@ -901,7 +1516,7 @@ static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) continue; list_del_init(&ap_msg->list); ap_dev->pendingq_count--; - ap_dev->drv->receive(ap_dev, ap_msg, ap_dev->reply); + ap_msg->receive(ap_dev, ap_msg, ap_dev->reply); break; } if (ap_dev->queue_count > 0) @@ -925,10 +1540,11 @@ static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) } /** - * Send messages from the request queue to an AP device. + * ap_poll_write(): Send messages from the request queue to an AP device. * @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 + * * Returns 0 if the device is still present, -ENODEV if not. */ static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) @@ -942,7 +1558,7 @@ static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) /* 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, - ap_msg->message, ap_msg->length); + ap_msg->message, ap_msg->length, ap_msg->special); switch (status.response_code) { case AP_RESPONSE_NORMAL: atomic_inc(&ap_poll_requests); @@ -955,11 +1571,13 @@ static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) *flags |= 1; *flags |= 2; break; - case AP_RESPONSE_Q_FULL: case AP_RESPONSE_RESET_IN_PROGRESS: + __ap_schedule_poll_timer(); + case AP_RESPONSE_Q_FULL: *flags |= 2; break; case AP_RESPONSE_MESSAGE_TOO_BIG: + case AP_RESPONSE_REQ_FAC_NOT_INST: return -EINVAL; default: return -ENODEV; @@ -968,11 +1586,13 @@ static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) } /** - * Poll AP device for pending replies and send new messages. If either - * ap_poll_read or ap_poll_write returns -ENODEV unregister the device. + * ap_poll_queue(): Poll AP device for pending replies and send new messages. * @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 + * + * Poll AP device for pending replies and send new messages. If either + * ap_poll_read or ap_poll_write returns -ENODEV unregister the device. * Returns 0. */ static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags) @@ -986,9 +1606,11 @@ static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags) } /** - * Queue a message to a device. + * __ap_queue_message(): Queue a message to a device. * @ap_dev: pointer to the AP device * @ap_msg: the message to be queued + * + * Queue a message to a device. Returns 0 if successful. */ static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) { @@ -997,7 +1619,8 @@ static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_ms if (list_empty(&ap_dev->requestq) && ap_dev->queue_count < ap_dev->queue_depth) { status = __ap_send(ap_dev->qid, ap_msg->psmid, - ap_msg->message, ap_msg->length); + ap_msg->message, ap_msg->length, + ap_msg->special); switch (status.response_code) { case AP_RESPONSE_NORMAL: list_add_tail(&ap_msg->list, &ap_dev->pendingq); @@ -1012,11 +1635,12 @@ static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_ms ap_dev->requestq_count++; ap_dev->total_request_count++; return -EBUSY; + case AP_RESPONSE_REQ_FAC_NOT_INST: case AP_RESPONSE_MESSAGE_TOO_BIG: - ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL)); + ap_msg->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)); + ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); return -ENODEV; } } else { @@ -1034,6 +1658,10 @@ void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) unsigned long flags; int rc; + /* For asynchronous message handling a valid receive-callback + * is required. */ + BUG_ON(!ap_msg->receive); + spin_lock_bh(&ap_dev->lock); if (!ap_dev->unregistered) { /* Make room on the queue by polling for finished requests. */ @@ -1045,7 +1673,7 @@ void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) if (rc == -ENODEV) ap_dev->unregistered = 1; } else { - ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); + ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); rc = -ENODEV; } spin_unlock_bh(&ap_dev->lock); @@ -1055,12 +1683,14 @@ void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) EXPORT_SYMBOL(ap_queue_message); /** + * 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 + * * Cancel a crypto request. This is done by removing the request - * from the devive pendingq or requestq queue. Note that the + * from the device pending or request queue. Note that the * request stays on the AP queue. When it finishes the message * reply will be discarded because the psmid can't be found. - * @ap_dev: AP device that has the message queued - * @ap_msg: the message that is to be removed */ void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) { @@ -1082,14 +1712,21 @@ void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) EXPORT_SYMBOL(ap_cancel_message); /** - * AP receive polling for finished AP requests + * ap_poll_timeout(): AP receive polling for finished AP requests. + * @unused: Unused pointer. + * + * Schedules the AP tasklet using a high resolution timer. */ -static void ap_poll_timeout(unsigned long unused) +static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) { tasklet_schedule(&ap_tasklet); + return HRTIMER_NORESTART; } /** + * ap_reset(): Reset a not responding AP device. + * @ap_dev: Pointer to the AP device + * * Reset a not responding AP device and move all requests from the * pending queue to the request queue. */ @@ -1106,44 +1743,58 @@ static void ap_reset(struct ap_device *ap_dev) rc = ap_init_queue(ap_dev->qid); if (rc == -ENODEV) ap_dev->unregistered = 1; + else + __ap_schedule_poll_timer(); } -/** - * 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. - */ -static int __ap_poll_all(struct ap_device *ap_dev, unsigned long *flags) +static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags) { - spin_lock(&ap_dev->lock); if (!ap_dev->unregistered) { if (ap_poll_queue(ap_dev, flags)) ap_dev->unregistered = 1; if (ap_dev->reset == AP_RESET_DO) ap_reset(ap_dev); } - spin_unlock(&ap_dev->lock); return 0; } +/** + * 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. + */ static void ap_poll_all(unsigned long dummy) { unsigned long flags; struct ap_device *ap_dev; + /* 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(ap_airq.lsi_ptr, 0); do { flags = 0; - spin_lock(&ap_device_lock); + spin_lock(&ap_device_list_lock); list_for_each_entry(ap_dev, &ap_device_list, list) { - __ap_poll_all(ap_dev, &flags); + spin_lock(&ap_dev->lock); + __ap_poll_device(ap_dev, &flags); + spin_unlock(&ap_dev->lock); } - spin_unlock(&ap_device_lock); + spin_unlock(&ap_device_list_lock); } while (flags & 1); if (flags & 2) ap_schedule_poll_timer(); } /** + * ap_poll_thread(): Thread that polls for finished requests. + * @data: Unused pointer + * * 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 @@ -1157,8 +1808,10 @@ static int ap_poll_thread(void *data) int requests; struct ap_device *ap_dev; - set_user_nice(current, 19); + set_user_nice(current, MAX_NICE); while (1) { + if (ap_suspend_flag) + return 0; if (need_resched()) { schedule(); continue; @@ -1174,11 +1827,13 @@ static int ap_poll_thread(void *data) remove_wait_queue(&ap_poll_wait, &wait); flags = 0; - spin_lock_bh(&ap_device_lock); + spin_lock_bh(&ap_device_list_lock); list_for_each_entry(ap_dev, &ap_device_list, list) { - __ap_poll_all(ap_dev, &flags); + spin_lock(&ap_dev->lock); + __ap_poll_device(ap_dev, &flags); + spin_unlock(&ap_dev->lock); } - spin_unlock_bh(&ap_device_lock); + spin_unlock_bh(&ap_device_list_lock); } set_current_state(TASK_RUNNING); remove_wait_queue(&ap_poll_wait, &wait); @@ -1189,10 +1844,12 @@ static int ap_poll_thread_start(void) { int rc; + if (ap_using_interrupts() || ap_suspend_flag) + return 0; 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; + rc = PTR_RET(ap_poll_kthread); if (rc) ap_poll_kthread = NULL; } @@ -1213,14 +1870,21 @@ static void ap_poll_thread_stop(void) } /** - * Handling of request timeouts + * ap_request_timeout(): Handling of request timeouts + * @data: Holds the AP device. + * + * Handles request timeouts. */ static void ap_request_timeout(unsigned long data) { struct ap_device *ap_dev = (struct ap_device *) data; - if (ap_dev->reset == AP_RESET_ARMED) + if (ap_dev->reset == AP_RESET_ARMED) { ap_dev->reset = AP_RESET_DO; + + if (ap_using_interrupts()) + tasklet_schedule(&ap_tasklet); + } } static void ap_reset_domain(void) @@ -1246,21 +1910,35 @@ static struct reset_call ap_reset_call = { }; /** - * The module initialization code. + * ap_module_init(): The module initialization code. + * + * Initializes the module. */ int __init ap_module_init(void) { int rc, i; if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) { - printk(KERN_WARNING "Invalid param: domain = %d. " - " Not loading.\n", ap_domain_index); + pr_warning("%d is not a valid cryptographic domain\n", + ap_domain_index); return -EINVAL; } + /* 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; + if (ap_instructions_available() != 0) { - printk(KERN_WARNING "AP instructions not installed.\n"); + pr_warning("The hardware system does not support " + "AP instructions\n"); return -ENODEV; } + if (ap_interrupts_available()) { + rc = register_adapter_interrupt(&ap_airq); + ap_airq_flag = (rc == 0); + } + register_reset_call(&ap_reset_call); /* Create /sys/bus/ap. */ @@ -1274,8 +1952,8 @@ int __init ap_module_init(void) } /* Create /sys/devices/ap. */ - ap_root_device = s390_root_dev_register("ap"); - rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0; + ap_root_device = root_device_register("ap"); + rc = PTR_RET(ap_root_device); if (rc) goto out_bus; @@ -1285,16 +1963,26 @@ int __init ap_module_init(void) goto out_root; } + ap_query_configuration(); if (ap_select_domain() == 0) ap_scan_bus(NULL); - /* Setup the ap bus rescan timer. */ + /* Setup the AP bus rescan timer. */ 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); + /* 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; + spin_lock_init(&ap_poll_timer_lock); + hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + ap_poll_timer.function = ap_poll_timeout; + /* Start the low priority AP bus poll thread. */ if (ap_thread_flag) { rc = ap_poll_thread_start(); @@ -1306,16 +1994,18 @@ int __init ap_module_init(void) out_work: del_timer_sync(&ap_config_timer); - del_timer_sync(&ap_poll_timer); + hrtimer_cancel(&ap_poll_timer); destroy_workqueue(ap_work_queue); out_root: - s390_root_dev_unregister(ap_root_device); + root_device_unregister(ap_root_device); out_bus: while (i--) bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); bus_unregister(&ap_bus_type); out: unregister_reset_call(&ap_reset_call); + if (ap_using_interrupts()) + unregister_adapter_interrupt(&ap_airq); return rc; } @@ -1325,7 +2015,9 @@ static int __ap_match_all(struct device *dev, void *data) } /** - * The module termination code + * ap_modules_exit(): The module termination code + * + * Terminates the module. */ void ap_module_exit(void) { @@ -1335,10 +2027,10 @@ void ap_module_exit(void) ap_reset_domain(); ap_poll_thread_stop(); del_timer_sync(&ap_config_timer); - del_timer_sync(&ap_poll_timer); + hrtimer_cancel(&ap_poll_timer); destroy_workqueue(ap_work_queue); tasklet_kill(&ap_tasklet); - s390_root_dev_unregister(ap_root_device); + root_device_unregister(ap_root_device); while ((dev = bus_find_device(&ap_bus_type, NULL, NULL, __ap_match_all))) { @@ -1349,9 +2041,9 @@ void ap_module_exit(void) bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); bus_unregister(&ap_bus_type); unregister_reset_call(&ap_reset_call); + if (ap_using_interrupts()) + unregister_adapter_interrupt(&ap_airq); } -#ifndef CONFIG_ZCRYPT_MONOLITHIC module_init(ap_module_init); module_exit(ap_module_exit); -#endif |