From: Harald Freudenberger Date: Fri, 8 May 2020 15:51:19 +0200 Subject: s390/ap: introduce new ap function ap_get_qdev() Git-commit: bc4b295e87a86bf14333753daeb1c84909197c46 Patch-mainline: v5.8-rc1 References: jsc#SLE-13815 bsc#1178402 LTC#186349 Provide a new interface function to be used by the ap drivers: struct ap_queue *ap_get_qdev(ap_qid_t qid); Returns ptr to the struct ap_queue device or NULL if there was no ap_queue device with this qid found. When something is found, the reference count of the embedded device is increased. So the caller has to decrease the reference count after use with a call to put_device(&aq->ap_dev.device). With this patch also the ap_card_list is removed from the ap core code and a new hashtable is introduced which stores hnodes of all the ap queues known to the ap bus. The hashtable approach and a first implementation of this interface comes from a previous patch from Anthony Krowiak and an idea from Halil Pasic. Signed-off-by: Harald Freudenberger Suggested-by: Tony Krowiak Suggested-by: Halil Pasic Reviewed-by: Tony Krowiak Signed-off-by: Vasily Gorbik Acked-by: Petr Tesarik --- drivers/s390/crypto/ap_bus.c | 94 +++++++++++++++++++++++------------------ drivers/s390/crypto/ap_bus.h | 25 ++++++---- drivers/s390/crypto/ap_card.c | 47 ++++++++++---------- drivers/s390/crypto/ap_queue.c | 10 +--- 4 files changed, 95 insertions(+), 81 deletions(-) --- a/drivers/s390/crypto/ap_bus.c +++ b/drivers/s390/crypto/ap_bus.c @@ -62,8 +62,10 @@ MODULE_PARM_DESC(aqmask, "AP bus domain static struct device *ap_root_device; -DEFINE_SPINLOCK(ap_list_lock); -LIST_HEAD(ap_card_list); +/* Hashtable of all queue devices on the AP bus */ +DEFINE_HASHTABLE(ap_queues, 8); +/* lock used for the ap_queues hashtable */ +DEFINE_SPINLOCK(ap_queues_lock); /* Default permissions (ioctl, card and domain masking) */ struct ap_perms ap_perms; @@ -425,7 +427,7 @@ static void ap_interrupt_handler(struct */ static void ap_tasklet_fn(unsigned long dummy) { - struct ap_card *ac; + int bkt; struct ap_queue *aq; enum ap_wait wait = AP_WAIT_NONE; @@ -436,34 +438,30 @@ static void ap_tasklet_fn(unsigned long if (ap_using_interrupts()) xchg(ap_airq.lsi_ptr, 0); - spin_lock_bh(&ap_list_lock); - for_each_ap_card(ac) { - for_each_ap_queue(aq, ac) { - spin_lock_bh(&aq->lock); - wait = min(wait, ap_sm_event_loop(aq, AP_EVENT_POLL)); - spin_unlock_bh(&aq->lock); - } + spin_lock_bh(&ap_queues_lock); + hash_for_each(ap_queues, bkt, aq, hnode) { + spin_lock_bh(&aq->lock); + wait = min(wait, ap_sm_event_loop(aq, AP_EVENT_POLL)); + spin_unlock_bh(&aq->lock); } - spin_unlock_bh(&ap_list_lock); + spin_unlock_bh(&ap_queues_lock); ap_wait(wait); } static int ap_pending_requests(void) { - struct ap_card *ac; + int bkt; struct ap_queue *aq; - spin_lock_bh(&ap_list_lock); - for_each_ap_card(ac) { - for_each_ap_queue(aq, ac) { - if (aq->queue_count == 0) - continue; - spin_unlock_bh(&ap_list_lock); - return 1; - } + spin_lock_bh(&ap_queues_lock); + hash_for_each(ap_queues, bkt, aq, hnode) { + if (aq->queue_count == 0) + continue; + spin_unlock_bh(&ap_queues_lock); + return 1; } - spin_unlock_bh(&ap_list_lock); + spin_unlock_bh(&ap_queues_lock); return 0; } @@ -796,24 +794,20 @@ static int ap_device_probe(struct device } /* Add queue/card to list of active queues/cards */ - spin_lock_bh(&ap_list_lock); - if (is_card_dev(dev)) - list_add(&to_ap_card(dev)->list, &ap_card_list); - else - list_add(&to_ap_queue(dev)->list, - &to_ap_queue(dev)->card->queues); - spin_unlock_bh(&ap_list_lock); + spin_lock_bh(&ap_queues_lock); + if (is_queue_dev(dev)) + hash_add(ap_queues, &to_ap_queue(dev)->hnode, + to_ap_queue(dev)->qid); + spin_unlock_bh(&ap_queues_lock); ap_dev->drv = ap_drv; rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; if (rc) { - spin_lock_bh(&ap_list_lock); - if (is_card_dev(dev)) - list_del_init(&to_ap_card(dev)->list); - else - list_del_init(&to_ap_queue(dev)->list); - spin_unlock_bh(&ap_list_lock); + spin_lock_bh(&ap_queues_lock); + if (is_queue_dev(dev)) + hash_del(&to_ap_queue(dev)->hnode); + spin_unlock_bh(&ap_queues_lock); ap_dev->drv = NULL; } @@ -838,16 +832,33 @@ static int ap_device_remove(struct devic ap_queue_remove(to_ap_queue(dev)); /* Remove queue/card from list of active queues/cards */ - spin_lock_bh(&ap_list_lock); - if (is_card_dev(dev)) - list_del_init(&to_ap_card(dev)->list); - else - list_del_init(&to_ap_queue(dev)->list); - spin_unlock_bh(&ap_list_lock); + spin_lock_bh(&ap_queues_lock); + if (is_queue_dev(dev)) + hash_del(&to_ap_queue(dev)->hnode); + spin_unlock_bh(&ap_queues_lock); return 0; } +struct ap_queue *ap_get_qdev(ap_qid_t qid) +{ + int bkt; + struct ap_queue *aq; + + spin_lock_bh(&ap_queues_lock); + hash_for_each(ap_queues, bkt, aq, hnode) { + if (aq->qid == qid) { + get_device(&aq->ap_dev.device); + spin_unlock_bh(&ap_queues_lock); + return aq; + } + } + spin_unlock_bh(&ap_queues_lock); + + return NULL; +} +EXPORT_SYMBOL(ap_get_qdev); + int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, char *name) { @@ -1623,6 +1634,9 @@ static int __init ap_module_init(void) return -ENODEV; } + /* init ap_queue hashtable */ + hash_init(ap_queues); + /* set up the AP permissions (ioctls, ap and aq masks) */ ap_perms_init(); --- a/drivers/s390/crypto/ap_bus.h +++ b/drivers/s390/crypto/ap_bus.h @@ -15,6 +15,7 @@ #include #include +#include #include #include @@ -27,8 +28,8 @@ extern int ap_domain_index; -extern spinlock_t ap_list_lock; -extern struct list_head ap_card_list; +extern DECLARE_HASHTABLE(ap_queues, 8); +extern spinlock_t ap_queues_lock; static inline int ap_test_bit(unsigned int *ptr, unsigned int nr) { @@ -155,8 +156,6 @@ struct ap_device { struct ap_card { struct ap_device ap_dev; - struct list_head list; /* Private list of AP cards. */ - struct list_head queues; /* List of assoc. AP queues */ void *private; /* ap driver private pointer. */ int raw_hwtype; /* AP raw hardware type. */ unsigned int functions; /* AP device function bitfield. */ @@ -169,7 +168,7 @@ struct ap_card { struct ap_queue { struct ap_device ap_dev; - struct list_head list; /* Private list of AP queues. */ + struct hlist_node hnode; /* Node for the ap_queues hashtable */ struct ap_card *card; /* Ptr to assoc. AP card. */ spinlock_t lock; /* Per device lock. */ void *private; /* ap driver private pointer. */ @@ -226,12 +225,6 @@ static inline void ap_release_message(st kzfree(ap_msg->private); } -#define for_each_ap_card(_ac) \ - list_for_each_entry(_ac, &ap_card_list, list) - -#define for_each_ap_queue(_aq, _ac) \ - list_for_each_entry(_aq, &(_ac)->queues, list) - /* * Note: don't use ap_send/ap_recv after using ap_queue_message * for the first time. Otherwise the ap message queue will get @@ -275,6 +268,16 @@ extern struct ap_perms ap_perms; extern struct mutex ap_perms_mutex; /* + * Get ap_queue device for this qid. + * Returns ptr to the struct ap_queue device or NULL if there + * was no ap_queue device with this qid found. When something is + * found, the reference count of the embedded device is increased. + * So the caller has to decrease the reference count after use + * with a call to put_device(&aq->ap_dev.device). + */ +struct ap_queue *ap_get_qdev(ap_qid_t qid); + +/* * check APQN for owned/reserved by ap bus and default driver(s). * Checks if this APQN is or will be in use by the ap bus * and the default set of drivers. --- a/drivers/s390/crypto/ap_card.c +++ b/drivers/s390/crypto/ap_card.c @@ -66,9 +66,9 @@ static ssize_t request_count_show(struct u64 req_cnt; req_cnt = 0; - spin_lock_bh(&ap_list_lock); + spin_lock_bh(&ap_queues_lock); req_cnt = atomic64_read(&ac->total_request_count); - spin_unlock_bh(&ap_list_lock); + spin_unlock_bh(&ap_queues_lock); return scnprintf(buf, PAGE_SIZE, "%llu\n", req_cnt); } @@ -76,13 +76,15 @@ static ssize_t request_count_store(struc struct device_attribute *attr, const char *buf, size_t count) { - struct ap_card *ac = to_ap_card(dev); + int bkt; struct ap_queue *aq; + struct ap_card *ac = to_ap_card(dev); - spin_lock_bh(&ap_list_lock); - for_each_ap_queue(aq, ac) - aq->total_request_count = 0; - spin_unlock_bh(&ap_list_lock); + spin_lock_bh(&ap_queues_lock); + hash_for_each(ap_queues, bkt, aq, hnode) + if (ac == aq->card) + aq->total_request_count = 0; + spin_unlock_bh(&ap_queues_lock); atomic64_set(&ac->total_request_count, 0); return count; @@ -93,15 +95,17 @@ static DEVICE_ATTR_RW(request_count); static ssize_t requestq_count_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct ap_card *ac = to_ap_card(dev); + int bkt; struct ap_queue *aq; unsigned int reqq_cnt; + struct ap_card *ac = to_ap_card(dev); reqq_cnt = 0; - spin_lock_bh(&ap_list_lock); - for_each_ap_queue(aq, ac) - reqq_cnt += aq->requestq_count; - spin_unlock_bh(&ap_list_lock); + spin_lock_bh(&ap_queues_lock); + hash_for_each(ap_queues, bkt, aq, hnode) + if (ac == aq->card) + reqq_cnt += aq->requestq_count; + spin_unlock_bh(&ap_queues_lock); return scnprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt); } @@ -110,15 +114,17 @@ static DEVICE_ATTR_RO(requestq_count); static ssize_t pendingq_count_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct ap_card *ac = to_ap_card(dev); + int bkt; struct ap_queue *aq; unsigned int penq_cnt; + struct ap_card *ac = to_ap_card(dev); penq_cnt = 0; - spin_lock_bh(&ap_list_lock); - for_each_ap_queue(aq, ac) - penq_cnt += aq->pendingq_count; - spin_unlock_bh(&ap_list_lock); + spin_lock_bh(&ap_queues_lock); + hash_for_each(ap_queues, bkt, aq, hnode) + if (ac == aq->card) + penq_cnt += aq->pendingq_count; + spin_unlock_bh(&ap_queues_lock); return scnprintf(buf, PAGE_SIZE, "%d\n", penq_cnt); } @@ -163,11 +169,6 @@ static void ap_card_device_release(struc { struct ap_card *ac = to_ap_card(dev); - if (!list_empty(&ac->list)) { - spin_lock_bh(&ap_list_lock); - list_del_init(&ac->list); - spin_unlock_bh(&ap_list_lock); - } kfree(ac); } @@ -179,8 +180,6 @@ struct ap_card *ap_card_create(int id, i ac = kzalloc(sizeof(*ac), GFP_KERNEL); if (!ac) return NULL; - INIT_LIST_HEAD(&ac->list); - INIT_LIST_HEAD(&ac->queues); ac->ap_dev.device.release = ap_card_device_release; ac->ap_dev.device.type = &ap_card_type; ac->ap_dev.device_type = comp_type; --- a/drivers/s390/crypto/ap_queue.c +++ b/drivers/s390/crypto/ap_queue.c @@ -619,11 +619,10 @@ static void ap_queue_device_release(stru { struct ap_queue *aq = to_ap_queue(dev); - if (!list_empty(&aq->list)) { - spin_lock_bh(&ap_list_lock); - list_del_init(&aq->list); - spin_unlock_bh(&ap_list_lock); - } + spin_lock_bh(&ap_queues_lock); + hash_del(&aq->hnode); + spin_unlock_bh(&ap_queues_lock); + kfree(aq); } @@ -641,7 +640,6 @@ struct ap_queue *ap_queue_create(ap_qid_ aq->state = AP_STATE_UNBOUND; aq->interrupt = AP_INTR_DISABLED; spin_lock_init(&aq->lock); - INIT_LIST_HEAD(&aq->list); INIT_LIST_HEAD(&aq->pendingq); INIT_LIST_HEAD(&aq->requestq); timer_setup(&aq->timeout, ap_request_timeout, 0);