drivers/staging/rdma/ehca/ehca_cq.c

   1 /*
   2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3  *
   4  *  Completion queue handling
   5  *
   6  *  Authors: Waleri Fomin <fomin@de.ibm.com>
   7  *           Khadija Souissi <souissi@de.ibm.com>
   8  *           Reinhard Ernst <rernst@de.ibm.com>
   9  *           Heiko J Schick <schickhj@de.ibm.com>
  10  *           Hoang-Nam Nguyen <hnguyen@de.ibm.com>
  11  *
  12  *
  13  *  Copyright (c) 2005 IBM Corporation
  14  *
  15  *  All rights reserved.
  16  *
  17  *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
  18  *  BSD.
  19  *
  20  * OpenIB BSD License
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions are met:
  24  *
  25  * Redistributions of source code must retain the above copyright notice, this
  26  * list of conditions and the following disclaimer.
  27  *
  28  * Redistributions in binary form must reproduce the above copyright notice,
  29  * this list of conditions and the following disclaimer in the documentation
  30  * and/or other materials
  31  * provided with the distribution.
  32  *
  33  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  34  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  36  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  37  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  38  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  39  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  40  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  41  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  42  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  43  * POSSIBILITY OF SUCH DAMAGE.
  44  */
  45
  46 #include <linux/slab.h>
  47
  48 #include "ehca_iverbs.h"
  49 #include "ehca_classes.h"
  50 #include "ehca_irq.h"
  51 #include "hcp_if.h"
  52
  53 static struct kmem_cache *cq_cache;
  54
  55 int ehca_cq_assign_qp(struct ehca_cq *cq, struct ehca_qp *qp)
  56 {
  57         unsigned int qp_num = qp->real_qp_num;
  58         unsigned int key = qp_num & (QP_HASHTAB_LEN-1);
  59         unsigned long flags;
  60
  61         spin_lock_irqsave(&cq->spinlock, flags);
  62         hlist_add_head(&qp->list_entries, &cq->qp_hashtab[key]);
  63         spin_unlock_irqrestore(&cq->spinlock, flags);
  64
  65         ehca_dbg(cq->ib_cq.device, "cq_num=%x real_qp_num=%x",
  66                  cq->cq_number, qp_num);
  67
  68         return 0;
  69 }
  70
  71 int ehca_cq_unassign_qp(struct ehca_cq *cq, unsigned int real_qp_num)
  72 {
  73         int ret = -EINVAL;
  74         unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1);
  75         struct hlist_node *iter;
  76         struct ehca_qp *qp;
  77         unsigned long flags;
  78
  79         spin_lock_irqsave(&cq->spinlock, flags);
  80         hlist_for_each(iter, &cq->qp_hashtab[key]) {
  81                 qp = hlist_entry(iter, struct ehca_qp, list_entries);
  82                 if (qp->real_qp_num == real_qp_num) {
  83                         hlist_del(iter);
  84                         ehca_dbg(cq->ib_cq.device,
  85                                  "removed qp from cq .cq_num=%x real_qp_num=%x",
  86                                  cq->cq_number, real_qp_num);
  87                         ret = 0;
  88                         break;
  89                 }
  90         }
  91         spin_unlock_irqrestore(&cq->spinlock, flags);
  92         if (ret)
  93                 ehca_err(cq->ib_cq.device,
  94                          "qp not found cq_num=%x real_qp_num=%x",
  95                          cq->cq_number, real_qp_num);
  96
  97         return ret;
  98 }
  99
 100 struct ehca_qp *ehca_cq_get_qp(struct ehca_cq *cq, int real_qp_num)
 101 {
 102         struct ehca_qp *ret = NULL;
 103         unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1);
 104         struct hlist_node *iter;
 105         struct ehca_qp *qp;
 106         hlist_for_each(iter, &cq->qp_hashtab[key]) {
 107                 qp = hlist_entry(iter, struct ehca_qp, list_entries);
 108                 if (qp->real_qp_num == real_qp_num) {
 109                         ret = qp;
 110                         break;
 111                 }
 112         }
 113         return ret;
 114 }
 115
 116 struct ib_cq *ehca_create_cq(struct ib_device *device,
 117                              const struct ib_cq_init_attr *attr,
 118                              struct ib_ucontext *context,
 119                              struct ib_udata *udata)
 120 {
 121         int cqe = attr->cqe;
 122         static const u32 additional_cqe = 20;
 123         struct ib_cq *cq;
 124         struct ehca_cq *my_cq;
 125         struct ehca_shca *shca =
 126                 container_of(device, struct ehca_shca, ib_device);
 127         struct ipz_adapter_handle adapter_handle;
 128         struct ehca_alloc_cq_parms param; /* h_call's out parameters */
 129         struct h_galpa gal;
 130         void *vpage;
 131         u32 counter;
 132         u64 rpage, cqx_fec, h_ret;
 133         int ipz_rc, i;
 134         unsigned long flags;
 135
 136         if (attr->flags)
 137                 return ERR_PTR(-EINVAL);
 138
 139         if (cqe >= 0xFFFFFFFF - 64 - additional_cqe)
 140                 return ERR_PTR(-EINVAL);
 141
 142         if (!atomic_add_unless(&shca->num_cqs, 1, shca->max_num_cqs)) {
 143                 ehca_err(device, "Unable to create CQ, max number of %i "
 144                         "CQs reached.", shca->max_num_cqs);
 145                 ehca_err(device, "To increase the maximum number of CQs "
 146                         "use the number_of_cqs module parameter.\n");
 147                 return ERR_PTR(-ENOSPC);
 148         }
 149
 150         my_cq = kmem_cache_zalloc(cq_cache, GFP_KERNEL);
 151         if (!my_cq) {
 152                 ehca_err(device, "Out of memory for ehca_cq struct device=%p",
 153                          device);
 154                 atomic_dec(&shca->num_cqs);
 155                 return ERR_PTR(-ENOMEM);
 156         }
 157
 158         memset(&param, 0, sizeof(struct ehca_alloc_cq_parms));
 159
 160         spin_lock_init(&my_cq->spinlock);
 161         spin_lock_init(&my_cq->cb_lock);
 162         spin_lock_init(&my_cq->task_lock);
 163         atomic_set(&my_cq->nr_events, 0);
 164         init_waitqueue_head(&my_cq->wait_completion);
 165
 166         cq = &my_cq->ib_cq;
 167
 168         adapter_handle = shca->ipz_hca_handle;
 169         param.eq_handle = shca->eq.ipz_eq_handle;
 170
 171         idr_preload(GFP_KERNEL);
 172         write_lock_irqsave(&ehca_cq_idr_lock, flags);
 173         my_cq->token = idr_alloc(&ehca_cq_idr, my_cq, 0, 0x2000000, GFP_NOWAIT);
 174         write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 175         idr_preload_end();
 176
 177         if (my_cq->token < 0) {
 178                 cq = ERR_PTR(-ENOMEM);
 179                 ehca_err(device, "Can't allocate new idr entry. device=%p",
 180                          device);
 181                 goto create_cq_exit1;
 182         }
 183
 184         /*
 185          * CQs maximum depth is 4GB-64, but we need additional 20 as buffer
 186          * for receiving errors CQEs.
 187          */
 188         param.nr_cqe = cqe + additional_cqe;
 189         h_ret = hipz_h_alloc_resource_cq(adapter_handle, my_cq, &param);
 190
 191         if (h_ret != H_SUCCESS) {
 192                 ehca_err(device, "hipz_h_alloc_resource_cq() failed "
 193                          "h_ret=%lli device=%p", h_ret, device);
 194                 cq = ERR_PTR(ehca2ib_return_code(h_ret));
 195                 goto create_cq_exit2;
 196         }
 197
 198         ipz_rc = ipz_queue_ctor(NULL, &my_cq->ipz_queue, param.act_pages,
 199                                 EHCA_PAGESIZE, sizeof(struct ehca_cqe), 0, 0);
 200         if (!ipz_rc) {
 201                 ehca_err(device, "ipz_queue_ctor() failed ipz_rc=%i device=%p",
 202                          ipz_rc, device);
 203                 cq = ERR_PTR(-EINVAL);
 204                 goto create_cq_exit3;
 205         }
 206
 207         for (counter = 0; counter < param.act_pages; counter++) {
 208                 vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
 209                 if (!vpage) {
 210                         ehca_err(device, "ipz_qpageit_get_inc() "
 211                                  "returns NULL device=%p", device);
 212                         cq = ERR_PTR(-EAGAIN);
 213                         goto create_cq_exit4;
 214                 }
 215                 rpage = __pa(vpage);
 216
 217                 h_ret = hipz_h_register_rpage_cq(adapter_handle,
 218                                                  my_cq->ipz_cq_handle,
 219                                                  &my_cq->pf,
 220                                                  0,
 221                                                  0,
 222                                                  rpage,
 223                                                  1,
 224                                                  my_cq->galpas.
 225                                                  kernel);
 226
 227                 if (h_ret < H_SUCCESS) {
 228                         ehca_err(device, "hipz_h_register_rpage_cq() failed "
 229                                  "ehca_cq=%p cq_num=%x h_ret=%lli counter=%i "
 230                                  "act_pages=%i", my_cq, my_cq->cq_number,
 231                                  h_ret, counter, param.act_pages);
 232                         cq = ERR_PTR(-EINVAL);
 233                         goto create_cq_exit4;
 234                 }
 235
 236                 if (counter == (param.act_pages - 1)) {
 237                         vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
 238                         if ((h_ret != H_SUCCESS) || vpage) {
 239                                 ehca_err(device, "Registration of pages not "
 240                                          "complete ehca_cq=%p cq_num=%x "
 241                                          "h_ret=%lli", my_cq, my_cq->cq_number,
 242                                          h_ret);
 243                                 cq = ERR_PTR(-EAGAIN);
 244                                 goto create_cq_exit4;
 245                         }
 246                 } else {
 247                         if (h_ret != H_PAGE_REGISTERED) {
 248                                 ehca_err(device, "Registration of page failed "
 249                                          "ehca_cq=%p cq_num=%x h_ret=%lli "
 250                                          "counter=%i act_pages=%i",
 251                                          my_cq, my_cq->cq_number,
 252                                          h_ret, counter, param.act_pages);
 253                                 cq = ERR_PTR(-ENOMEM);
 254                                 goto create_cq_exit4;
 255                         }
 256                 }
 257         }
 258
 259         ipz_qeit_reset(&my_cq->ipz_queue);
 260
 261         gal = my_cq->galpas.kernel;
 262         cqx_fec = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_fec));
 263         ehca_dbg(device, "ehca_cq=%p cq_num=%x CQX_FEC=%llx",
 264                  my_cq, my_cq->cq_number, cqx_fec);
 265
 266         my_cq->ib_cq.cqe = my_cq->nr_of_entries =
 267                 param.act_nr_of_entries - additional_cqe;
 268         my_cq->cq_number = (my_cq->ipz_cq_handle.handle) & 0xffff;
 269
 270         for (i = 0; i < QP_HASHTAB_LEN; i++)
 271                 INIT_HLIST_HEAD(&my_cq->qp_hashtab[i]);
 272
 273         INIT_LIST_HEAD(&my_cq->sqp_err_list);
 274         INIT_LIST_HEAD(&my_cq->rqp_err_list);
 275
 276         if (context) {
 277                 struct ipz_queue *ipz_queue = &my_cq->ipz_queue;
 278                 struct ehca_create_cq_resp resp;
 279                 memset(&resp, 0, sizeof(resp));
 280                 resp.cq_number = my_cq->cq_number;
 281                 resp.token = my_cq->token;
 282                 resp.ipz_queue.qe_size = ipz_queue->qe_size;
 283                 resp.ipz_queue.act_nr_of_sg = ipz_queue->act_nr_of_sg;
 284                 resp.ipz_queue.queue_length = ipz_queue->queue_length;
 285                 resp.ipz_queue.pagesize = ipz_queue->pagesize;
 286                 resp.ipz_queue.toggle_state = ipz_queue->toggle_state;
 287                 resp.fw_handle_ofs = (u32)
 288                         (my_cq->galpas.user.fw_handle & (PAGE_SIZE - 1));
 289                 if (ib_copy_to_udata(udata, &resp, sizeof(resp))) {
 290                         ehca_err(device, "Copy to udata failed.");
 291                         cq = ERR_PTR(-EFAULT);
 292                         goto create_cq_exit4;
 293                 }
 294         }
 295
 296         return cq;
 297
 298 create_cq_exit4:
 299         ipz_queue_dtor(NULL, &my_cq->ipz_queue);
 300
 301 create_cq_exit3:
 302         h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
 303         if (h_ret != H_SUCCESS)
 304                 ehca_err(device, "hipz_h_destroy_cq() failed ehca_cq=%p "
 305                          "cq_num=%x h_ret=%lli", my_cq, my_cq->cq_number, h_ret);
 306
 307 create_cq_exit2:
 308         write_lock_irqsave(&ehca_cq_idr_lock, flags);
 309         idr_remove(&ehca_cq_idr, my_cq->token);
 310         write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 311
 312 create_cq_exit1:
 313         kmem_cache_free(cq_cache, my_cq);
 314
 315         atomic_dec(&shca->num_cqs);
 316         return cq;
 317 }
 318
 319 int ehca_destroy_cq(struct ib_cq *cq)
 320 {
 321         u64 h_ret;
 322         struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
 323         int cq_num = my_cq->cq_number;
 324         struct ib_device *device = cq->device;
 325         struct ehca_shca *shca = container_of(device, struct ehca_shca,
 326                                               ib_device);
 327         struct ipz_adapter_handle adapter_handle = shca->ipz_hca_handle;
 328         unsigned long flags;
 329
 330         if (cq->uobject) {
 331                 if (my_cq->mm_count_galpa || my_cq->mm_count_queue) {
 332                         ehca_err(device, "Resources still referenced in "
 333                                  "user space cq_num=%x", my_cq->cq_number);
 334                         return -EINVAL;
 335                 }
 336         }
 337
 338         /*
 339          * remove the CQ from the idr first to make sure
 340          * no more interrupt tasklets will touch this CQ
 341          */
 342         write_lock_irqsave(&ehca_cq_idr_lock, flags);
 343         idr_remove(&ehca_cq_idr, my_cq->token);
 344         write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 345
 346         /* now wait until all pending events have completed */
 347         wait_event(my_cq->wait_completion, !atomic_read(&my_cq->nr_events));
 348
 349         /* nobody's using our CQ any longer -- we can destroy it */
 350         h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 0);
 351         if (h_ret == H_R_STATE) {
 352                 /* cq in err: read err data and destroy it forcibly */
 353                 ehca_dbg(device, "ehca_cq=%p cq_num=%x resource=%llx in err "
 354                          "state. Try to delete it forcibly.",
 355                          my_cq, cq_num, my_cq->ipz_cq_handle.handle);
 356                 ehca_error_data(shca, my_cq, my_cq->ipz_cq_handle.handle);
 357                 h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
 358                 if (h_ret == H_SUCCESS)
 359                         ehca_dbg(device, "cq_num=%x deleted successfully.",
 360                                  cq_num);
 361         }
 362         if (h_ret != H_SUCCESS) {
 363                 ehca_err(device, "hipz_h_destroy_cq() failed h_ret=%lli "
 364                          "ehca_cq=%p cq_num=%x", h_ret, my_cq, cq_num);
 365                 return ehca2ib_return_code(h_ret);
 366         }
 367         ipz_queue_dtor(NULL, &my_cq->ipz_queue);
 368         kmem_cache_free(cq_cache, my_cq);
 369
 370         atomic_dec(&shca->num_cqs);
 371         return 0;
 372 }
 373
 374 int ehca_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
 375 {
 376         /* TODO: proper resize needs to be done */
 377         ehca_err(cq->device, "not implemented yet");
 378
 379         return -EFAULT;
 380 }
 381
 382 int ehca_init_cq_cache(void)
 383 {
 384         cq_cache = kmem_cache_create("ehca_cache_cq",
 385                                      sizeof(struct ehca_cq), 0,
 386                                      SLAB_HWCACHE_ALIGN,
 387                                      NULL);
 388         if (!cq_cache)
 389                 return -ENOMEM;
 390         return 0;
 391 }
 392
 393 void ehca_cleanup_cq_cache(void)
 394 {
 395         if (cq_cache)
 396                 kmem_cache_destroy(cq_cache);
 397 }