2 * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
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16 * copyright notice, this list of conditions and the following
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30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <linux/err.h>
35 #include <linux/slab.h>
36 #include <linux/vmalloc.h>
38 #include "ipath_verbs.h"
41 * ipath_cq_enter - add a new entry to the completion queue
42 * @cq: completion queue
43 * @entry: work completion entry to add
44 * @sig: true if @entry is a solicitated entry
46 * This may be called with qp->s_lock held.
48 void ipath_cq_enter(struct ipath_cq *cq, struct ib_wc *entry, int solicited)
50 struct ipath_cq_wc *wc;
55 spin_lock_irqsave(&cq->lock, flags);
58 * Note that the head pointer might be writable by user processes.
59 * Take care to verify it is a sane value.
63 if (head >= (unsigned) cq->ibcq.cqe) {
68 if (unlikely(next == wc->tail)) {
69 spin_unlock_irqrestore(&cq->lock, flags);
70 if (cq->ibcq.event_handler) {
73 ev.device = cq->ibcq.device;
74 ev.element.cq = &cq->ibcq;
75 ev.event = IB_EVENT_CQ_ERR;
76 cq->ibcq.event_handler(&ev, cq->ibcq.cq_context);
81 wc->uqueue[head].wr_id = entry->wr_id;
82 wc->uqueue[head].status = entry->status;
83 wc->uqueue[head].opcode = entry->opcode;
84 wc->uqueue[head].vendor_err = entry->vendor_err;
85 wc->uqueue[head].byte_len = entry->byte_len;
86 wc->uqueue[head].ex.imm_data = (__u32 __force) entry->ex.imm_data;
87 wc->uqueue[head].qp_num = entry->qp->qp_num;
88 wc->uqueue[head].src_qp = entry->src_qp;
89 wc->uqueue[head].wc_flags = entry->wc_flags;
90 wc->uqueue[head].pkey_index = entry->pkey_index;
91 wc->uqueue[head].slid = entry->slid;
92 wc->uqueue[head].sl = entry->sl;
93 wc->uqueue[head].dlid_path_bits = entry->dlid_path_bits;
94 wc->uqueue[head].port_num = entry->port_num;
95 /* Make sure entry is written before the head index. */
98 wc->kqueue[head] = *entry;
101 if (cq->notify == IB_CQ_NEXT_COMP ||
102 (cq->notify == IB_CQ_SOLICITED && solicited)) {
103 cq->notify = IB_CQ_NONE;
106 * This will cause send_complete() to be called in
109 tasklet_hi_schedule(&cq->comptask);
112 spin_unlock_irqrestore(&cq->lock, flags);
114 if (entry->status != IB_WC_SUCCESS)
115 to_idev(cq->ibcq.device)->n_wqe_errs++;
119 * ipath_poll_cq - poll for work completion entries
120 * @ibcq: the completion queue to poll
121 * @num_entries: the maximum number of entries to return
122 * @entry: pointer to array where work completions are placed
124 * Returns the number of completion entries polled.
126 * This may be called from interrupt context. Also called by ib_poll_cq()
127 * in the generic verbs code.
129 int ipath_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry)
131 struct ipath_cq *cq = to_icq(ibcq);
132 struct ipath_cq_wc *wc;
137 /* The kernel can only poll a kernel completion queue */
143 spin_lock_irqsave(&cq->lock, flags);
147 if (tail > (u32) cq->ibcq.cqe)
148 tail = (u32) cq->ibcq.cqe;
149 for (npolled = 0; npolled < num_entries; ++npolled, ++entry) {
150 if (tail == wc->head)
152 /* The kernel doesn't need a RMB since it has the lock. */
153 *entry = wc->kqueue[tail];
154 if (tail >= cq->ibcq.cqe)
161 spin_unlock_irqrestore(&cq->lock, flags);
167 static void send_complete(unsigned long data)
169 struct ipath_cq *cq = (struct ipath_cq *)data;
172 * The completion handler will most likely rearm the notification
173 * and poll for all pending entries. If a new completion entry
174 * is added while we are in this routine, tasklet_hi_schedule()
175 * won't call us again until we return so we check triggered to
176 * see if we need to call the handler again.
179 u8 triggered = cq->triggered;
181 cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
183 if (cq->triggered == triggered)
189 * ipath_create_cq - create a completion queue
190 * @ibdev: the device this completion queue is attached to
191 * @entries: the minimum size of the completion queue
192 * @context: unused by the InfiniPath driver
193 * @udata: unused by the InfiniPath driver
195 * Returns a pointer to the completion queue or negative errno values
198 * Called by ib_create_cq() in the generic verbs code.
200 struct ib_cq *ipath_create_cq(struct ib_device *ibdev, int entries, int comp_vector,
201 struct ib_ucontext *context,
202 struct ib_udata *udata)
204 struct ipath_ibdev *dev = to_idev(ibdev);
206 struct ipath_cq_wc *wc;
210 if (entries < 1 || entries > ib_ipath_max_cqes) {
211 ret = ERR_PTR(-EINVAL);
215 /* Allocate the completion queue structure. */
216 cq = kmalloc(sizeof(*cq), GFP_KERNEL);
218 ret = ERR_PTR(-ENOMEM);
223 * Allocate the completion queue entries and head/tail pointers.
224 * This is allocated separately so that it can be resized and
225 * also mapped into user space.
226 * We need to use vmalloc() in order to support mmap and large
227 * numbers of entries.
230 if (udata && udata->outlen >= sizeof(__u64))
231 sz += sizeof(struct ib_uverbs_wc) * (entries + 1);
233 sz += sizeof(struct ib_wc) * (entries + 1);
234 wc = vmalloc_user(sz);
236 ret = ERR_PTR(-ENOMEM);
241 * Return the address of the WC as the offset to mmap.
242 * See ipath_mmap() for details.
244 if (udata && udata->outlen >= sizeof(__u64)) {
247 cq->ip = ipath_create_mmap_info(dev, sz, context, wc);
249 ret = ERR_PTR(-ENOMEM);
253 err = ib_copy_to_udata(udata, &cq->ip->offset,
254 sizeof(cq->ip->offset));
262 spin_lock(&dev->n_cqs_lock);
263 if (dev->n_cqs_allocated == ib_ipath_max_cqs) {
264 spin_unlock(&dev->n_cqs_lock);
265 ret = ERR_PTR(-ENOMEM);
269 dev->n_cqs_allocated++;
270 spin_unlock(&dev->n_cqs_lock);
273 spin_lock_irq(&dev->pending_lock);
274 list_add(&cq->ip->pending_mmaps, &dev->pending_mmaps);
275 spin_unlock_irq(&dev->pending_lock);
279 * ib_create_cq() will initialize cq->ibcq except for cq->ibcq.cqe.
280 * The number of entries should be >= the number requested or return
283 cq->ibcq.cqe = entries;
284 cq->notify = IB_CQ_NONE;
286 spin_lock_init(&cq->lock);
287 tasklet_init(&cq->comptask, send_complete, (unsigned long)cq);
307 * ipath_destroy_cq - destroy a completion queue
308 * @ibcq: the completion queue to destroy.
310 * Returns 0 for success.
312 * Called by ib_destroy_cq() in the generic verbs code.
314 int ipath_destroy_cq(struct ib_cq *ibcq)
316 struct ipath_ibdev *dev = to_idev(ibcq->device);
317 struct ipath_cq *cq = to_icq(ibcq);
319 tasklet_kill(&cq->comptask);
320 spin_lock(&dev->n_cqs_lock);
321 dev->n_cqs_allocated--;
322 spin_unlock(&dev->n_cqs_lock);
324 kref_put(&cq->ip->ref, ipath_release_mmap_info);
333 * ipath_req_notify_cq - change the notification type for a completion queue
334 * @ibcq: the completion queue
335 * @notify_flags: the type of notification to request
337 * Returns 0 for success.
339 * This may be called from interrupt context. Also called by
340 * ib_req_notify_cq() in the generic verbs code.
342 int ipath_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags)
344 struct ipath_cq *cq = to_icq(ibcq);
348 spin_lock_irqsave(&cq->lock, flags);
350 * Don't change IB_CQ_NEXT_COMP to IB_CQ_SOLICITED but allow
351 * any other transitions (see C11-31 and C11-32 in ch. 11.4.2.2).
353 if (cq->notify != IB_CQ_NEXT_COMP)
354 cq->notify = notify_flags & IB_CQ_SOLICITED_MASK;
356 if ((notify_flags & IB_CQ_REPORT_MISSED_EVENTS) &&
357 cq->queue->head != cq->queue->tail)
360 spin_unlock_irqrestore(&cq->lock, flags);
366 * ipath_resize_cq - change the size of the CQ
367 * @ibcq: the completion queue
369 * Returns 0 for success.
371 int ipath_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata)
373 struct ipath_cq *cq = to_icq(ibcq);
374 struct ipath_cq_wc *old_wc;
375 struct ipath_cq_wc *wc;
380 if (cqe < 1 || cqe > ib_ipath_max_cqes) {
386 * Need to use vmalloc() if we want to support large #s of entries.
389 if (udata && udata->outlen >= sizeof(__u64))
390 sz += sizeof(struct ib_uverbs_wc) * (cqe + 1);
392 sz += sizeof(struct ib_wc) * (cqe + 1);
393 wc = vmalloc_user(sz);
399 /* Check that we can write the offset to mmap. */
400 if (udata && udata->outlen >= sizeof(__u64)) {
403 ret = ib_copy_to_udata(udata, &offset, sizeof(offset));
408 spin_lock_irq(&cq->lock);
410 * Make sure head and tail are sane since they
411 * might be user writable.
415 if (head > (u32) cq->ibcq.cqe)
416 head = (u32) cq->ibcq.cqe;
418 if (tail > (u32) cq->ibcq.cqe)
419 tail = (u32) cq->ibcq.cqe;
421 n = cq->ibcq.cqe + 1 + head - tail;
424 if (unlikely((u32)cqe < n)) {
428 for (n = 0; tail != head; n++) {
430 wc->uqueue[n] = old_wc->uqueue[tail];
432 wc->kqueue[n] = old_wc->kqueue[tail];
433 if (tail == (u32) cq->ibcq.cqe)
442 spin_unlock_irq(&cq->lock);
447 struct ipath_ibdev *dev = to_idev(ibcq->device);
448 struct ipath_mmap_info *ip = cq->ip;
450 ipath_update_mmap_info(dev, ip, sz, wc);
453 * Return the offset to mmap.
454 * See ipath_mmap() for details.
456 if (udata && udata->outlen >= sizeof(__u64)) {
457 ret = ib_copy_to_udata(udata, &ip->offset,
463 spin_lock_irq(&dev->pending_lock);
464 if (list_empty(&ip->pending_mmaps))
465 list_add(&ip->pending_mmaps, &dev->pending_mmaps);
466 spin_unlock_irq(&dev->pending_lock);
473 spin_unlock_irq(&cq->lock);