diff options
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_cq.c')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_cq.c | 484 |
1 files changed, 484 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/qib/qib_cq.c b/drivers/infiniband/hw/qib/qib_cq.c new file mode 100644 index 00000000000..a86cbf880f9 --- /dev/null +++ b/drivers/infiniband/hw/qib/qib_cq.c @@ -0,0 +1,484 @@ +/* + * Copyright (c) 2006, 2007, 2008, 2010 QLogic Corporation. All rights reserved. + * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> + +#include "qib_verbs.h" + +/** + * qib_cq_enter - add a new entry to the completion queue + * @cq: completion queue + * @entry: work completion entry to add + * @sig: true if @entry is a solicitated entry + * + * This may be called with qp->s_lock held. + */ +void qib_cq_enter(struct qib_cq *cq, struct ib_wc *entry, int solicited) +{ + struct qib_cq_wc *wc; + unsigned long flags; + u32 head; + u32 next; + + spin_lock_irqsave(&cq->lock, flags); + + /* + * Note that the head pointer might be writable by user processes. + * Take care to verify it is a sane value. + */ + wc = cq->queue; + head = wc->head; + if (head >= (unsigned) cq->ibcq.cqe) { + head = cq->ibcq.cqe; + next = 0; + } else + next = head + 1; + if (unlikely(next == wc->tail)) { + spin_unlock_irqrestore(&cq->lock, flags); + if (cq->ibcq.event_handler) { + struct ib_event ev; + + ev.device = cq->ibcq.device; + ev.element.cq = &cq->ibcq; + ev.event = IB_EVENT_CQ_ERR; + cq->ibcq.event_handler(&ev, cq->ibcq.cq_context); + } + return; + } + if (cq->ip) { + wc->uqueue[head].wr_id = entry->wr_id; + wc->uqueue[head].status = entry->status; + wc->uqueue[head].opcode = entry->opcode; + wc->uqueue[head].vendor_err = entry->vendor_err; + wc->uqueue[head].byte_len = entry->byte_len; + wc->uqueue[head].ex.imm_data = + (__u32 __force)entry->ex.imm_data; + wc->uqueue[head].qp_num = entry->qp->qp_num; + wc->uqueue[head].src_qp = entry->src_qp; + wc->uqueue[head].wc_flags = entry->wc_flags; + wc->uqueue[head].pkey_index = entry->pkey_index; + wc->uqueue[head].slid = entry->slid; + wc->uqueue[head].sl = entry->sl; + wc->uqueue[head].dlid_path_bits = entry->dlid_path_bits; + wc->uqueue[head].port_num = entry->port_num; + /* Make sure entry is written before the head index. */ + smp_wmb(); + } else + wc->kqueue[head] = *entry; + wc->head = next; + + if (cq->notify == IB_CQ_NEXT_COMP || + (cq->notify == IB_CQ_SOLICITED && solicited)) { + cq->notify = IB_CQ_NONE; + cq->triggered++; + /* + * This will cause send_complete() to be called in + * another thread. + */ + queue_work(qib_cq_wq, &cq->comptask); + } + + spin_unlock_irqrestore(&cq->lock, flags); +} + +/** + * qib_poll_cq - poll for work completion entries + * @ibcq: the completion queue to poll + * @num_entries: the maximum number of entries to return + * @entry: pointer to array where work completions are placed + * + * Returns the number of completion entries polled. + * + * This may be called from interrupt context. Also called by ib_poll_cq() + * in the generic verbs code. + */ +int qib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry) +{ + struct qib_cq *cq = to_icq(ibcq); + struct qib_cq_wc *wc; + unsigned long flags; + int npolled; + u32 tail; + + /* The kernel can only poll a kernel completion queue */ + if (cq->ip) { + npolled = -EINVAL; + goto bail; + } + + spin_lock_irqsave(&cq->lock, flags); + + wc = cq->queue; + tail = wc->tail; + if (tail > (u32) cq->ibcq.cqe) + tail = (u32) cq->ibcq.cqe; + for (npolled = 0; npolled < num_entries; ++npolled, ++entry) { + if (tail == wc->head) + break; + /* The kernel doesn't need a RMB since it has the lock. */ + *entry = wc->kqueue[tail]; + if (tail >= cq->ibcq.cqe) + tail = 0; + else + tail++; + } + wc->tail = tail; + + spin_unlock_irqrestore(&cq->lock, flags); + +bail: + return npolled; +} + +static void send_complete(struct work_struct *work) +{ + struct qib_cq *cq = container_of(work, struct qib_cq, comptask); + + /* + * The completion handler will most likely rearm the notification + * and poll for all pending entries. If a new completion entry + * is added while we are in this routine, queue_work() + * won't call us again until we return so we check triggered to + * see if we need to call the handler again. + */ + for (;;) { + u8 triggered = cq->triggered; + + /* + * IPoIB connected mode assumes the callback is from a + * soft IRQ. We simulate this by blocking "bottom halves". + * See the implementation for ipoib_cm_handle_tx_wc(), + * netif_tx_lock_bh() and netif_tx_lock(). + */ + local_bh_disable(); + cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context); + local_bh_enable(); + + if (cq->triggered == triggered) + return; + } +} + +/** + * qib_create_cq - create a completion queue + * @ibdev: the device this completion queue is attached to + * @entries: the minimum size of the completion queue + * @context: unused by the QLogic_IB driver + * @udata: user data for libibverbs.so + * + * Returns a pointer to the completion queue or negative errno values + * for failure. + * + * Called by ib_create_cq() in the generic verbs code. + */ +struct ib_cq *qib_create_cq(struct ib_device *ibdev, int entries, + int comp_vector, struct ib_ucontext *context, + struct ib_udata *udata) +{ + struct qib_ibdev *dev = to_idev(ibdev); + struct qib_cq *cq; + struct qib_cq_wc *wc; + struct ib_cq *ret; + u32 sz; + + if (entries < 1 || entries > ib_qib_max_cqes) { + ret = ERR_PTR(-EINVAL); + goto done; + } + + /* Allocate the completion queue structure. */ + cq = kmalloc(sizeof(*cq), GFP_KERNEL); + if (!cq) { + ret = ERR_PTR(-ENOMEM); + goto done; + } + + /* + * Allocate the completion queue entries and head/tail pointers. + * This is allocated separately so that it can be resized and + * also mapped into user space. + * We need to use vmalloc() in order to support mmap and large + * numbers of entries. + */ + sz = sizeof(*wc); + if (udata && udata->outlen >= sizeof(__u64)) + sz += sizeof(struct ib_uverbs_wc) * (entries + 1); + else + sz += sizeof(struct ib_wc) * (entries + 1); + wc = vmalloc_user(sz); + if (!wc) { + ret = ERR_PTR(-ENOMEM); + goto bail_cq; + } + + /* + * Return the address of the WC as the offset to mmap. + * See qib_mmap() for details. + */ + if (udata && udata->outlen >= sizeof(__u64)) { + int err; + + cq->ip = qib_create_mmap_info(dev, sz, context, wc); + if (!cq->ip) { + ret = ERR_PTR(-ENOMEM); + goto bail_wc; + } + + err = ib_copy_to_udata(udata, &cq->ip->offset, + sizeof(cq->ip->offset)); + if (err) { + ret = ERR_PTR(err); + goto bail_ip; + } + } else + cq->ip = NULL; + + spin_lock(&dev->n_cqs_lock); + if (dev->n_cqs_allocated == ib_qib_max_cqs) { + spin_unlock(&dev->n_cqs_lock); + ret = ERR_PTR(-ENOMEM); + goto bail_ip; + } + + dev->n_cqs_allocated++; + spin_unlock(&dev->n_cqs_lock); + + if (cq->ip) { + spin_lock_irq(&dev->pending_lock); + list_add(&cq->ip->pending_mmaps, &dev->pending_mmaps); + spin_unlock_irq(&dev->pending_lock); + } + + /* + * ib_create_cq() will initialize cq->ibcq except for cq->ibcq.cqe. + * The number of entries should be >= the number requested or return + * an error. + */ + cq->ibcq.cqe = entries; + cq->notify = IB_CQ_NONE; + cq->triggered = 0; + spin_lock_init(&cq->lock); + INIT_WORK(&cq->comptask, send_complete); + wc->head = 0; + wc->tail = 0; + cq->queue = wc; + + ret = &cq->ibcq; + + goto done; + +bail_ip: + kfree(cq->ip); +bail_wc: + vfree(wc); +bail_cq: + kfree(cq); +done: + return ret; +} + +/** + * qib_destroy_cq - destroy a completion queue + * @ibcq: the completion queue to destroy. + * + * Returns 0 for success. + * + * Called by ib_destroy_cq() in the generic verbs code. + */ +int qib_destroy_cq(struct ib_cq *ibcq) +{ + struct qib_ibdev *dev = to_idev(ibcq->device); + struct qib_cq *cq = to_icq(ibcq); + + flush_work(&cq->comptask); + spin_lock(&dev->n_cqs_lock); + dev->n_cqs_allocated--; + spin_unlock(&dev->n_cqs_lock); + if (cq->ip) + kref_put(&cq->ip->ref, qib_release_mmap_info); + else + vfree(cq->queue); + kfree(cq); + + return 0; +} + +/** + * qib_req_notify_cq - change the notification type for a completion queue + * @ibcq: the completion queue + * @notify_flags: the type of notification to request + * + * Returns 0 for success. + * + * This may be called from interrupt context. Also called by + * ib_req_notify_cq() in the generic verbs code. + */ +int qib_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags) +{ + struct qib_cq *cq = to_icq(ibcq); + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&cq->lock, flags); + /* + * Don't change IB_CQ_NEXT_COMP to IB_CQ_SOLICITED but allow + * any other transitions (see C11-31 and C11-32 in ch. 11.4.2.2). + */ + if (cq->notify != IB_CQ_NEXT_COMP) + cq->notify = notify_flags & IB_CQ_SOLICITED_MASK; + + if ((notify_flags & IB_CQ_REPORT_MISSED_EVENTS) && + cq->queue->head != cq->queue->tail) + ret = 1; + + spin_unlock_irqrestore(&cq->lock, flags); + + return ret; +} + +/** + * qib_resize_cq - change the size of the CQ + * @ibcq: the completion queue + * + * Returns 0 for success. + */ +int qib_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata) +{ + struct qib_cq *cq = to_icq(ibcq); + struct qib_cq_wc *old_wc; + struct qib_cq_wc *wc; + u32 head, tail, n; + int ret; + u32 sz; + + if (cqe < 1 || cqe > ib_qib_max_cqes) { + ret = -EINVAL; + goto bail; + } + + /* + * Need to use vmalloc() if we want to support large #s of entries. + */ + sz = sizeof(*wc); + if (udata && udata->outlen >= sizeof(__u64)) + sz += sizeof(struct ib_uverbs_wc) * (cqe + 1); + else + sz += sizeof(struct ib_wc) * (cqe + 1); + wc = vmalloc_user(sz); + if (!wc) { + ret = -ENOMEM; + goto bail; + } + + /* Check that we can write the offset to mmap. */ + if (udata && udata->outlen >= sizeof(__u64)) { + __u64 offset = 0; + + ret = ib_copy_to_udata(udata, &offset, sizeof(offset)); + if (ret) + goto bail_free; + } + + spin_lock_irq(&cq->lock); + /* + * Make sure head and tail are sane since they + * might be user writable. + */ + old_wc = cq->queue; + head = old_wc->head; + if (head > (u32) cq->ibcq.cqe) + head = (u32) cq->ibcq.cqe; + tail = old_wc->tail; + if (tail > (u32) cq->ibcq.cqe) + tail = (u32) cq->ibcq.cqe; + if (head < tail) + n = cq->ibcq.cqe + 1 + head - tail; + else + n = head - tail; + if (unlikely((u32)cqe < n)) { + ret = -EINVAL; + goto bail_unlock; + } + for (n = 0; tail != head; n++) { + if (cq->ip) + wc->uqueue[n] = old_wc->uqueue[tail]; + else + wc->kqueue[n] = old_wc->kqueue[tail]; + if (tail == (u32) cq->ibcq.cqe) + tail = 0; + else + tail++; + } + cq->ibcq.cqe = cqe; + wc->head = n; + wc->tail = 0; + cq->queue = wc; + spin_unlock_irq(&cq->lock); + + vfree(old_wc); + + if (cq->ip) { + struct qib_ibdev *dev = to_idev(ibcq->device); + struct qib_mmap_info *ip = cq->ip; + + qib_update_mmap_info(dev, ip, sz, wc); + + /* + * Return the offset to mmap. + * See qib_mmap() for details. + */ + if (udata && udata->outlen >= sizeof(__u64)) { + ret = ib_copy_to_udata(udata, &ip->offset, + sizeof(ip->offset)); + if (ret) + goto bail; + } + + spin_lock_irq(&dev->pending_lock); + if (list_empty(&ip->pending_mmaps)) + list_add(&ip->pending_mmaps, &dev->pending_mmaps); + spin_unlock_irq(&dev->pending_lock); + } + + ret = 0; + goto bail; + +bail_unlock: + spin_unlock_irq(&cq->lock); +bail_free: + vfree(wc); +bail: + return ret; +} |