release/src-rt-6.x/linux/linux-2.6/drivers/infiniband/hw/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 <asm/current.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 spl_flags;
  60
  61         spin_lock_irqsave(&cq->spinlock, spl_flags);
  62         hlist_add_head(&qp->list_entries, &cq->qp_hashtab[key]);
  63         spin_unlock_irqrestore(&cq->spinlock, spl_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 spl_flags;
  78
  79         spin_lock_irqsave(&cq->spinlock, spl_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, spl_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, int cqe, int comp_vector,
 117                              struct ib_ucontext *context,
 118                              struct ib_udata *udata)
 119 {
 120         static const u32 additional_cqe = 20;
 121         struct ib_cq *cq;
 122         struct ehca_cq *my_cq;
 123         struct ehca_shca *shca =
 124                 container_of(device, struct ehca_shca, ib_device);
 125         struct ipz_adapter_handle adapter_handle;
 126         struct ehca_alloc_cq_parms param; /* h_call's out parameters */
 127         struct h_galpa gal;
 128         void *vpage;
 129         u32 counter;
 130         u64 rpage, cqx_fec, h_ret;
 131         int ipz_rc, ret, i;
 132         unsigned long flags;
 133
 134         if (cqe >= 0xFFFFFFFF - 64 - additional_cqe)
 135                 return ERR_PTR(-EINVAL);
 136
 137         my_cq = kmem_cache_zalloc(cq_cache, GFP_KERNEL);
 138         if (!my_cq) {
 139                 ehca_err(device, "Out of memory for ehca_cq struct device=%p",
 140                          device);
 141                 return ERR_PTR(-ENOMEM);
 142         }
 143
 144         memset(&param, 0, sizeof(struct ehca_alloc_cq_parms));
 145
 146         spin_lock_init(&my_cq->spinlock);
 147         spin_lock_init(&my_cq->cb_lock);
 148         spin_lock_init(&my_cq->task_lock);
 149         init_waitqueue_head(&my_cq->wait_completion);
 150         my_cq->ownpid = current->tgid;
 151
 152         cq = &my_cq->ib_cq;
 153
 154         adapter_handle = shca->ipz_hca_handle;
 155         param.eq_handle = shca->eq.ipz_eq_handle;
 156
 157         do {
 158                 if (!idr_pre_get(&ehca_cq_idr, GFP_KERNEL)) {
 159                         cq = ERR_PTR(-ENOMEM);
 160                         ehca_err(device, "Can't reserve idr nr. device=%p",
 161                                  device);
 162                         goto create_cq_exit1;
 163                 }
 164
 165                 spin_lock_irqsave(&ehca_cq_idr_lock, flags);
 166                 ret = idr_get_new(&ehca_cq_idr, my_cq, &my_cq->token);
 167                 spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 168
 169         } while (ret == -EAGAIN);
 170
 171         if (ret) {
 172                 cq = ERR_PTR(-ENOMEM);
 173                 ehca_err(device, "Can't allocate new idr entry. device=%p",
 174                          device);
 175                 goto create_cq_exit1;
 176         }
 177
 178         /*
 179          * CQs maximum depth is 4GB-64, but we need additional 20 as buffer
 180          * for receiving errors CQEs.
 181          */
 182         param.nr_cqe = cqe + additional_cqe;
 183         h_ret = hipz_h_alloc_resource_cq(adapter_handle, my_cq, &param);
 184
 185         if (h_ret != H_SUCCESS) {
 186                 ehca_err(device, "hipz_h_alloc_resource_cq() failed "
 187                          "h_ret=%lx device=%p", h_ret, device);
 188                 cq = ERR_PTR(ehca2ib_return_code(h_ret));
 189                 goto create_cq_exit2;
 190         }
 191
 192         ipz_rc = ipz_queue_ctor(&my_cq->ipz_queue, param.act_pages,
 193                                 EHCA_PAGESIZE, sizeof(struct ehca_cqe), 0);
 194         if (!ipz_rc) {
 195                 ehca_err(device, "ipz_queue_ctor() failed ipz_rc=%x device=%p",
 196                          ipz_rc, device);
 197                 cq = ERR_PTR(-EINVAL);
 198                 goto create_cq_exit3;
 199         }
 200
 201         for (counter = 0; counter < param.act_pages; counter++) {
 202                 vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
 203                 if (!vpage) {
 204                         ehca_err(device, "ipz_qpageit_get_inc() "
 205                                  "returns NULL device=%p", device);
 206                         cq = ERR_PTR(-EAGAIN);
 207                         goto create_cq_exit4;
 208                 }
 209                 rpage = virt_to_abs(vpage);
 210
 211                 h_ret = hipz_h_register_rpage_cq(adapter_handle,
 212                                                  my_cq->ipz_cq_handle,
 213                                                  &my_cq->pf,
 214                                                  0,
 215                                                  0,
 216                                                  rpage,
 217                                                  1,
 218                                                  my_cq->galpas.
 219                                                  kernel);
 220
 221                 if (h_ret < H_SUCCESS) {
 222                         ehca_err(device, "hipz_h_register_rpage_cq() failed "
 223                                  "ehca_cq=%p cq_num=%x h_ret=%lx counter=%i "
 224                                  "act_pages=%i", my_cq, my_cq->cq_number,
 225                                  h_ret, counter, param.act_pages);
 226                         cq = ERR_PTR(-EINVAL);
 227                         goto create_cq_exit4;
 228                 }
 229
 230                 if (counter == (param.act_pages - 1)) {
 231                         vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
 232                         if ((h_ret != H_SUCCESS) || vpage) {
 233                                 ehca_err(device, "Registration of pages not "
 234                                          "complete ehca_cq=%p cq_num=%x "
 235                                          "h_ret=%lx", my_cq, my_cq->cq_number,
 236                                          h_ret);
 237                                 cq = ERR_PTR(-EAGAIN);
 238                                 goto create_cq_exit4;
 239                         }
 240                 } else {
 241                         if (h_ret != H_PAGE_REGISTERED) {
 242                                 ehca_err(device, "Registration of page failed "
 243                                          "ehca_cq=%p cq_num=%x h_ret=%lx"
 244                                          "counter=%i act_pages=%i",
 245                                          my_cq, my_cq->cq_number,
 246                                          h_ret, counter, param.act_pages);
 247                                 cq = ERR_PTR(-ENOMEM);
 248                                 goto create_cq_exit4;
 249                         }
 250                 }
 251         }
 252
 253         ipz_qeit_reset(&my_cq->ipz_queue);
 254
 255         gal = my_cq->galpas.kernel;
 256         cqx_fec = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_fec));
 257         ehca_dbg(device, "ehca_cq=%p cq_num=%x CQX_FEC=%lx",
 258                  my_cq, my_cq->cq_number, cqx_fec);
 259
 260         my_cq->ib_cq.cqe = my_cq->nr_of_entries =
 261                 param.act_nr_of_entries - additional_cqe;
 262         my_cq->cq_number = (my_cq->ipz_cq_handle.handle) & 0xffff;
 263
 264         for (i = 0; i < QP_HASHTAB_LEN; i++)
 265                 INIT_HLIST_HEAD(&my_cq->qp_hashtab[i]);
 266
 267         if (context) {
 268                 struct ipz_queue *ipz_queue = &my_cq->ipz_queue;
 269                 struct ehca_create_cq_resp resp;
 270                 memset(&resp, 0, sizeof(resp));
 271                 resp.cq_number = my_cq->cq_number;
 272                 resp.token = my_cq->token;
 273                 resp.ipz_queue.qe_size = ipz_queue->qe_size;
 274                 resp.ipz_queue.act_nr_of_sg = ipz_queue->act_nr_of_sg;
 275                 resp.ipz_queue.queue_length = ipz_queue->queue_length;
 276                 resp.ipz_queue.pagesize = ipz_queue->pagesize;
 277                 resp.ipz_queue.toggle_state = ipz_queue->toggle_state;
 278                 if (ib_copy_to_udata(udata, &resp, sizeof(resp))) {
 279                         ehca_err(device, "Copy to udata failed.");
 280                         goto create_cq_exit4;
 281                 }
 282         }
 283
 284         return cq;
 285
 286 create_cq_exit4:
 287         ipz_queue_dtor(&my_cq->ipz_queue);
 288
 289 create_cq_exit3:
 290         h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
 291         if (h_ret != H_SUCCESS)
 292                 ehca_err(device, "hipz_h_destroy_cq() failed ehca_cq=%p "
 293                          "cq_num=%x h_ret=%lx", my_cq, my_cq->cq_number, h_ret);
 294
 295 create_cq_exit2:
 296         spin_lock_irqsave(&ehca_cq_idr_lock, flags);
 297         idr_remove(&ehca_cq_idr, my_cq->token);
 298         spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 299
 300 create_cq_exit1:
 301         kmem_cache_free(cq_cache, my_cq);
 302
 303         return cq;
 304 }
 305
 306 static int get_cq_nr_events(struct ehca_cq *my_cq)
 307 {
 308         int ret;
 309         unsigned long flags;
 310         spin_lock_irqsave(&ehca_cq_idr_lock, flags);
 311         ret = my_cq->nr_events;
 312         spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 313         return ret;
 314 }
 315
 316 int ehca_destroy_cq(struct ib_cq *cq)
 317 {
 318         u64 h_ret;
 319         struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
 320         int cq_num = my_cq->cq_number;
 321         struct ib_device *device = cq->device;
 322         struct ehca_shca *shca = container_of(device, struct ehca_shca,
 323                                               ib_device);
 324         struct ipz_adapter_handle adapter_handle = shca->ipz_hca_handle;
 325         u32 cur_pid = current->tgid;
 326         unsigned long flags;
 327
 328         if (cq->uobject) {
 329                 if (my_cq->mm_count_galpa || my_cq->mm_count_queue) {
 330                         ehca_err(device, "Resources still referenced in "
 331                                  "user space cq_num=%x", my_cq->cq_number);
 332                         return -EINVAL;
 333                 }
 334                 if (my_cq->ownpid != cur_pid) {
 335                         ehca_err(device, "Invalid caller pid=%x ownpid=%x "
 336                                  "cq_num=%x",
 337                                  cur_pid, my_cq->ownpid, my_cq->cq_number);
 338                         return -EINVAL;
 339                 }
 340         }
 341
 342         spin_lock_irqsave(&ehca_cq_idr_lock, flags);
 343         while (my_cq->nr_events) {
 344                 spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 345                 wait_event(my_cq->wait_completion, !get_cq_nr_events(my_cq));
 346                 spin_lock_irqsave(&ehca_cq_idr_lock, flags);
 347                 /* recheck nr_events to assure no cqe has just arrived */
 348         }
 349
 350         idr_remove(&ehca_cq_idr, my_cq->token);
 351         spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 352
 353         h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 0);
 354         if (h_ret == H_R_STATE) {
 355                 /* cq in err: read err data and destroy it forcibly */
 356                 ehca_dbg(device, "ehca_cq=%p cq_num=%x ressource=%lx in err "
 357                          "state. Try to delete it forcibly.",
 358                          my_cq, cq_num, my_cq->ipz_cq_handle.handle);
 359                 ehca_error_data(shca, my_cq, my_cq->ipz_cq_handle.handle);
 360                 h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
 361                 if (h_ret == H_SUCCESS)
 362                         ehca_dbg(device, "cq_num=%x deleted successfully.",
 363                                  cq_num);
 364         }
 365         if (h_ret != H_SUCCESS) {
 366                 ehca_err(device, "hipz_h_destroy_cq() failed h_ret=%lx "
 367                          "ehca_cq=%p cq_num=%x", h_ret, my_cq, cq_num);
 368                 return ehca2ib_return_code(h_ret);
 369         }
 370         ipz_queue_dtor(&my_cq->ipz_queue);
 371         kmem_cache_free(cq_cache, my_cq);
 372
 373         return 0;
 374 }
 375
 376 int ehca_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
 377 {
 378         struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
 379         u32 cur_pid = current->tgid;
 380
 381         if (cq->uobject && my_cq->ownpid != cur_pid) {
 382                 ehca_err(cq->device, "Invalid caller pid=%x ownpid=%x",
 383                          cur_pid, my_cq->ownpid);
 384                 return -EINVAL;
 385         }
 386
 387         /* TODO: proper resize needs to be done */
 388         ehca_err(cq->device, "not implemented yet");
 389
 390         return -EFAULT;
 391 }
 392
 393 int ehca_init_cq_cache(void)
 394 {
 395         cq_cache = kmem_cache_create("ehca_cache_cq",
 396                                      sizeof(struct ehca_cq), 0,
 397                                      SLAB_HWCACHE_ALIGN,
 398                                      NULL, NULL);
 399         if (!cq_cache)
 400                 return -ENOMEM;
 401         return 0;
 402 }
 403
 404 void ehca_cleanup_cq_cache(void)
 405 {
 406         if (cq_cache)
 407                 kmem_cache_destroy(cq_cache);
 408 }