drivers/infiniband/hw/amso1100/c2_cq.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2005 Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   6  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   7  * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
   8  *
   9  * This software is available to you under a choice of one of two
  10  * licenses.  You may choose to be licensed under the terms of the GNU
  11  * General Public License (GPL) Version 2, available from the file
  12  * COPYING in the main directory of this source tree, or the
  13  * OpenIB.org BSD license below:
  14  *
  15  *     Redistribution and use in source and binary forms, with or
  16  *     without modification, are permitted provided that the following
  17  *     conditions are met:
  18  *
  19  *      - Redistributions of source code must retain the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer.
  22  *
  23  *      - Redistributions in binary form must reproduce the above
  24  *        copyright notice, this list of conditions and the following
  25  *        disclaimer in the documentation and/or other materials
  26  *        provided with the distribution.
  27  *
  28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  32  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  33  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  34  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  35  * SOFTWARE.
  36  *
  37  */
  38 #include "c2.h"
  39 #include "c2_vq.h"
  40 #include "c2_status.h"
  41
  42 #define C2_CQ_MSG_SIZE ((sizeof(struct c2wr_ce) + 32-1) & ~(32-1))
  43
  44 static struct c2_cq *c2_cq_get(struct c2_dev *c2dev, int cqn)
  45 {
  46         struct c2_cq *cq;
  47         unsigned long flags;
  48
  49         spin_lock_irqsave(&c2dev->lock, flags);
  50         cq = c2dev->qptr_array[cqn];
  51         if (!cq) {
  52                 spin_unlock_irqrestore(&c2dev->lock, flags);
  53                 return NULL;
  54         }
  55         atomic_inc(&cq->refcount);
  56         spin_unlock_irqrestore(&c2dev->lock, flags);
  57         return cq;
  58 }
  59
  60 static void c2_cq_put(struct c2_cq *cq)
  61 {
  62         if (atomic_dec_and_test(&cq->refcount))
  63                 wake_up(&cq->wait);
  64 }
  65
  66 void c2_cq_event(struct c2_dev *c2dev, u32 mq_index)
  67 {
  68         struct c2_cq *cq;
  69
  70         cq = c2_cq_get(c2dev, mq_index);
  71         if (!cq) {
  72                 printk("discarding events on destroyed CQN=%d\n", mq_index);
  73                 return;
  74         }
  75
  76         (*cq->ibcq.comp_handler) (&cq->ibcq, cq->ibcq.cq_context);
  77         c2_cq_put(cq);
  78 }
  79
  80 void c2_cq_clean(struct c2_dev *c2dev, struct c2_qp *qp, u32 mq_index)
  81 {
  82         struct c2_cq *cq;
  83         struct c2_mq *q;
  84
  85         cq = c2_cq_get(c2dev, mq_index);
  86         if (!cq)
  87                 return;
  88
  89         spin_lock_irq(&cq->lock);
  90         q = &cq->mq;
  91         if (q && !c2_mq_empty(q)) {
  92                 u16 priv = q->priv;
  93                 struct c2wr_ce *msg;
  94
  95                 while (priv != be16_to_cpu(*q->shared)) {
  96                         msg = (struct c2wr_ce *)
  97                                 (q->msg_pool.host + priv * q->msg_size);
  98                         if (msg->qp_user_context == (u64) (unsigned long) qp) {
  99                                 msg->qp_user_context = (u64) 0;
 100                         }
 101                         priv = (priv + 1) % q->q_size;
 102                 }
 103         }
 104         spin_unlock_irq(&cq->lock);
 105         c2_cq_put(cq);
 106 }
 107
 108 static inline enum ib_wc_status c2_cqe_status_to_openib(u8 status)
 109 {
 110         switch (status) {
 111         case C2_OK:
 112                 return IB_WC_SUCCESS;
 113         case CCERR_FLUSHED:
 114                 return IB_WC_WR_FLUSH_ERR;
 115         case CCERR_BASE_AND_BOUNDS_VIOLATION:
 116                 return IB_WC_LOC_PROT_ERR;
 117         case CCERR_ACCESS_VIOLATION:
 118                 return IB_WC_LOC_ACCESS_ERR;
 119         case CCERR_TOTAL_LENGTH_TOO_BIG:
 120                 return IB_WC_LOC_LEN_ERR;
 121         case CCERR_INVALID_WINDOW:
 122                 return IB_WC_MW_BIND_ERR;
 123         default:
 124                 return IB_WC_GENERAL_ERR;
 125         }
 126 }
 127
 128
 129 static inline int c2_poll_one(struct c2_dev *c2dev,
 130                               struct c2_cq *cq, struct ib_wc *entry)
 131 {
 132         struct c2wr_ce *ce;
 133         struct c2_qp *qp;
 134         int is_recv = 0;
 135
 136         ce = (struct c2wr_ce *) c2_mq_consume(&cq->mq);
 137         if (!ce) {
 138                 return -EAGAIN;
 139         }
 140
 141         /*
 142          * if the qp returned is null then this qp has already
 143          * been freed and we are unable process the completion.
 144          * try pulling the next message
 145          */
 146         while ((qp =
 147                 (struct c2_qp *) (unsigned long) ce->qp_user_context) == NULL) {
 148                 c2_mq_free(&cq->mq);
 149                 ce = (struct c2wr_ce *) c2_mq_consume(&cq->mq);
 150                 if (!ce)
 151                         return -EAGAIN;
 152         }
 153
 154         entry->status = c2_cqe_status_to_openib(c2_wr_get_result(ce));
 155         entry->wr_id = ce->hdr.context;
 156         entry->qp = &qp->ibqp;
 157         entry->wc_flags = 0;
 158         entry->slid = 0;
 159         entry->sl = 0;
 160         entry->src_qp = 0;
 161         entry->dlid_path_bits = 0;
 162         entry->pkey_index = 0;
 163
 164         switch (c2_wr_get_id(ce)) {
 165         case C2_WR_TYPE_SEND:
 166                 entry->opcode = IB_WC_SEND;
 167                 break;
 168         case C2_WR_TYPE_RDMA_WRITE:
 169                 entry->opcode = IB_WC_RDMA_WRITE;
 170                 break;
 171         case C2_WR_TYPE_RDMA_READ:
 172                 entry->opcode = IB_WC_RDMA_READ;
 173                 break;
 174         case C2_WR_TYPE_BIND_MW:
 175                 entry->opcode = IB_WC_BIND_MW;
 176                 break;
 177         case C2_WR_TYPE_RECV:
 178                 entry->byte_len = be32_to_cpu(ce->bytes_rcvd);
 179                 entry->opcode = IB_WC_RECV;
 180                 is_recv = 1;
 181                 break;
 182         default:
 183                 break;
 184         }
 185
 186         /* consume the WQEs */
 187         if (is_recv)
 188                 c2_mq_lconsume(&qp->rq_mq, 1);
 189         else
 190                 c2_mq_lconsume(&qp->sq_mq,
 191                                be32_to_cpu(c2_wr_get_wqe_count(ce)) + 1);
 192
 193         /* free the message */
 194         c2_mq_free(&cq->mq);
 195
 196         return 0;
 197 }
 198
 199 int c2_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry)
 200 {
 201         struct c2_dev *c2dev = to_c2dev(ibcq->device);
 202         struct c2_cq *cq = to_c2cq(ibcq);
 203         unsigned long flags;
 204         int npolled, err;
 205
 206         spin_lock_irqsave(&cq->lock, flags);
 207
 208         for (npolled = 0; npolled < num_entries; ++npolled) {
 209
 210                 err = c2_poll_one(c2dev, cq, entry + npolled);
 211                 if (err)
 212                         break;
 213         }
 214
 215         spin_unlock_irqrestore(&cq->lock, flags);
 216
 217         return npolled;
 218 }
 219
 220 int c2_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify notify)
 221 {
 222         struct c2_mq_shared __iomem *shared;
 223         struct c2_cq *cq;
 224
 225         cq = to_c2cq(ibcq);
 226         shared = cq->mq.peer;
 227
 228         if (notify == IB_CQ_NEXT_COMP)
 229                 writeb(C2_CQ_NOTIFICATION_TYPE_NEXT, &shared->notification_type);
 230         else if (notify == IB_CQ_SOLICITED)
 231                 writeb(C2_CQ_NOTIFICATION_TYPE_NEXT_SE, &shared->notification_type);
 232         else
 233                 return -EINVAL;
 234
 235         writeb(CQ_WAIT_FOR_DMA | CQ_ARMED, &shared->armed);
 236
 237         /*
 238          * Now read back shared->armed to make the PCI
 239          * write synchronous.  This is necessary for
 240          * correct cq notification semantics.
 241          */
 242         readb(&shared->armed);
 243
 244         return 0;
 245 }
 246
 247 static void c2_free_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq)
 248 {
 249         dma_free_coherent(&c2dev->pcidev->dev, mq->q_size * mq->msg_size,
 250                           mq->msg_pool.host, pci_unmap_addr(mq, mapping));
 251 }
 252
 253 static int c2_alloc_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq, int q_size,
 254                            int msg_size)
 255 {
 256         u8 *pool_start;
 257
 258         pool_start = dma_alloc_coherent(&c2dev->pcidev->dev, q_size * msg_size,
 259                                         &mq->host_dma, GFP_KERNEL);
 260         if (!pool_start)
 261                 return -ENOMEM;
 262
 263         c2_mq_rep_init(mq,
 264                        0,               /* index (currently unknown) */
 265                        q_size,
 266                        msg_size,
 267                        pool_start,
 268                        NULL,    /* peer (currently unknown) */
 269                        C2_MQ_HOST_TARGET);
 270
 271         pci_unmap_addr_set(mq, mapping, mq->host_dma);
 272
 273         return 0;
 274 }
 275
 276 int c2_init_cq(struct c2_dev *c2dev, int entries,
 277                struct c2_ucontext *ctx, struct c2_cq *cq)
 278 {
 279         struct c2wr_cq_create_req wr;
 280         struct c2wr_cq_create_rep *reply;
 281         unsigned long peer_pa;
 282         struct c2_vq_req *vq_req;
 283         int err;
 284
 285         might_sleep();
 286
 287         cq->ibcq.cqe = entries - 1;
 288         cq->is_kernel = !ctx;
 289
 290         /* Allocate a shared pointer */
 291         cq->mq.shared = c2_alloc_mqsp(c2dev, c2dev->kern_mqsp_pool,
 292                                       &cq->mq.shared_dma, GFP_KERNEL);
 293         if (!cq->mq.shared)
 294                 return -ENOMEM;
 295
 296         /* Allocate pages for the message pool */
 297         err = c2_alloc_cq_buf(c2dev, &cq->mq, entries + 1, C2_CQ_MSG_SIZE);
 298         if (err)
 299                 goto bail0;
 300
 301         vq_req = vq_req_alloc(c2dev);
 302         if (!vq_req) {
 303                 err = -ENOMEM;
 304                 goto bail1;
 305         }
 306
 307         memset(&wr, 0, sizeof(wr));
 308         c2_wr_set_id(&wr, CCWR_CQ_CREATE);
 309         wr.hdr.context = (unsigned long) vq_req;
 310         wr.rnic_handle = c2dev->adapter_handle;
 311         wr.msg_size = cpu_to_be32(cq->mq.msg_size);
 312         wr.depth = cpu_to_be32(cq->mq.q_size);
 313         wr.shared_ht = cpu_to_be64(cq->mq.shared_dma);
 314         wr.msg_pool = cpu_to_be64(cq->mq.host_dma);
 315         wr.user_context = (u64) (unsigned long) (cq);
 316
 317         vq_req_get(c2dev, vq_req);
 318
 319         err = vq_send_wr(c2dev, (union c2wr *) & wr);
 320         if (err) {
 321                 vq_req_put(c2dev, vq_req);
 322                 goto bail2;
 323         }
 324
 325         err = vq_wait_for_reply(c2dev, vq_req);
 326         if (err)
 327                 goto bail2;
 328
 329         reply = (struct c2wr_cq_create_rep *) (unsigned long) (vq_req->reply_msg);
 330         if (!reply) {
 331                 err = -ENOMEM;
 332                 goto bail2;
 333         }
 334
 335         if ((err = c2_errno(reply)) != 0)
 336                 goto bail3;
 337
 338         cq->adapter_handle = reply->cq_handle;
 339         cq->mq.index = be32_to_cpu(reply->mq_index);
 340
 341         peer_pa = c2dev->pa + be32_to_cpu(reply->adapter_shared);
 342         cq->mq.peer = ioremap_nocache(peer_pa, PAGE_SIZE);
 343         if (!cq->mq.peer) {
 344                 err = -ENOMEM;
 345                 goto bail3;
 346         }
 347
 348         vq_repbuf_free(c2dev, reply);
 349         vq_req_free(c2dev, vq_req);
 350
 351         spin_lock_init(&cq->lock);
 352         atomic_set(&cq->refcount, 1);
 353         init_waitqueue_head(&cq->wait);
 354
 355         /*
 356          * Use the MQ index allocated by the adapter to
 357          * store the CQ in the qptr_array
 358          */
 359         cq->cqn = cq->mq.index;
 360         c2dev->qptr_array[cq->cqn] = cq;
 361
 362         return 0;
 363
 364       bail3:
 365         vq_repbuf_free(c2dev, reply);
 366       bail2:
 367         vq_req_free(c2dev, vq_req);
 368       bail1:
 369         c2_free_cq_buf(c2dev, &cq->mq);
 370       bail0:
 371         c2_free_mqsp(cq->mq.shared);
 372
 373         return err;
 374 }
 375
 376 void c2_free_cq(struct c2_dev *c2dev, struct c2_cq *cq)
 377 {
 378         int err;
 379         struct c2_vq_req *vq_req;
 380         struct c2wr_cq_destroy_req wr;
 381         struct c2wr_cq_destroy_rep *reply;
 382
 383         might_sleep();
 384
 385         /* Clear CQ from the qptr array */
 386         spin_lock_irq(&c2dev->lock);
 387         c2dev->qptr_array[cq->mq.index] = NULL;
 388         atomic_dec(&cq->refcount);
 389         spin_unlock_irq(&c2dev->lock);
 390
 391         wait_event(cq->wait, !atomic_read(&cq->refcount));
 392
 393         vq_req = vq_req_alloc(c2dev);
 394         if (!vq_req) {
 395                 goto bail0;
 396         }
 397
 398         memset(&wr, 0, sizeof(wr));
 399         c2_wr_set_id(&wr, CCWR_CQ_DESTROY);
 400         wr.hdr.context = (unsigned long) vq_req;
 401         wr.rnic_handle = c2dev->adapter_handle;
 402         wr.cq_handle = cq->adapter_handle;
 403
 404         vq_req_get(c2dev, vq_req);
 405
 406         err = vq_send_wr(c2dev, (union c2wr *) & wr);
 407         if (err) {
 408                 vq_req_put(c2dev, vq_req);
 409                 goto bail1;
 410         }
 411
 412         err = vq_wait_for_reply(c2dev, vq_req);
 413         if (err)
 414                 goto bail1;
 415
 416         reply = (struct c2wr_cq_destroy_rep *) (unsigned long) (vq_req->reply_msg);
 417
 418         vq_repbuf_free(c2dev, reply);
 419       bail1:
 420         vq_req_free(c2dev, vq_req);
 421       bail0:
 422         if (cq->is_kernel) {
 423                 c2_free_cq_buf(c2dev, &cq->mq);
 424         }
 425
 426         return;
 427 }