drivers/infiniband/hw/ehca/ehca_eq.c

   1 /*
   2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3  *
   4  *  Event 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 "ehca_classes.h"
  47 #include "ehca_irq.h"
  48 #include "ehca_iverbs.h"
  49 #include "ehca_qes.h"
  50 #include "hcp_if.h"
  51 #include "ipz_pt_fn.h"
  52
  53 int ehca_create_eq(struct ehca_shca *shca,
  54                    struct ehca_eq *eq,
  55                    const enum ehca_eq_type type, const u32 length)
  56 {
  57         int ret;
  58         u64 h_ret;
  59         u32 nr_pages;
  60         u32 i;
  61         void *vpage;
  62         struct ib_device *ib_dev = &shca->ib_device;
  63
  64         spin_lock_init(&eq->spinlock);
  65         spin_lock_init(&eq->irq_spinlock);
  66         eq->is_initialized = 0;
  67
  68         if (type != EHCA_EQ && type != EHCA_NEQ) {
  69                 ehca_err(ib_dev, "Invalid EQ type %x. eq=%p", type, eq);
  70                 return -EINVAL;
  71         }
  72         if (!length) {
  73                 ehca_err(ib_dev, "EQ length must not be zero. eq=%p", eq);
  74                 return -EINVAL;
  75         }
  76
  77         h_ret = hipz_h_alloc_resource_eq(shca->ipz_hca_handle,
  78                                          &eq->pf,
  79                                          type,
  80                                          length,
  81                                          &eq->ipz_eq_handle,
  82                                          &eq->length,
  83                                          &nr_pages, &eq->ist);
  84
  85         if (h_ret != H_SUCCESS) {
  86                 ehca_err(ib_dev, "Can't allocate EQ/NEQ. eq=%p", eq);
  87                 return -EINVAL;
  88         }
  89
  90         ret = ipz_queue_ctor(NULL, &eq->ipz_queue, nr_pages,
  91                              EHCA_PAGESIZE, sizeof(struct ehca_eqe), 0, 0);
  92         if (!ret) {
  93                 ehca_err(ib_dev, "Can't allocate EQ pages eq=%p", eq);
  94                 goto create_eq_exit1;
  95         }
  96
  97         for (i = 0; i < nr_pages; i++) {
  98                 u64 rpage;
  99
 100                 vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
 101                 if (!vpage)
 102                         goto create_eq_exit2;
 103
 104                 rpage = virt_to_abs(vpage);
 105                 h_ret = hipz_h_register_rpage_eq(shca->ipz_hca_handle,
 106                                                  eq->ipz_eq_handle,
 107                                                  &eq->pf,
 108                                                  0, 0, rpage, 1);
 109
 110                 if (i == (nr_pages - 1)) {
 111                         /* last page */
 112                         vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
 113                         if (h_ret != H_SUCCESS || vpage)
 114                                 goto create_eq_exit2;
 115                 } else {
 116                         if (h_ret != H_PAGE_REGISTERED)
 117                                 goto create_eq_exit2;
 118                 }
 119         }
 120
 121         ipz_qeit_reset(&eq->ipz_queue);
 122
 123         /* register interrupt handlers and initialize work queues */
 124         if (type == EHCA_EQ) {
 125                 tasklet_init(&eq->interrupt_task, ehca_tasklet_eq, (long)shca);
 126
 127                 ret = ibmebus_request_irq(eq->ist, ehca_interrupt_eq,
 128                                           IRQF_DISABLED, "ehca_eq",
 129                                           (void *)shca);
 130                 if (ret < 0)
 131                         ehca_err(ib_dev, "Can't map interrupt handler.");
 132         } else if (type == EHCA_NEQ) {
 133                 tasklet_init(&eq->interrupt_task, ehca_tasklet_neq, (long)shca);
 134
 135                 ret = ibmebus_request_irq(eq->ist, ehca_interrupt_neq,
 136                                           IRQF_DISABLED, "ehca_neq",
 137                                           (void *)shca);
 138                 if (ret < 0)
 139                         ehca_err(ib_dev, "Can't map interrupt handler.");
 140         }
 141
 142         eq->is_initialized = 1;
 143
 144         return 0;
 145
 146 create_eq_exit2:
 147         ipz_queue_dtor(NULL, &eq->ipz_queue);
 148
 149 create_eq_exit1:
 150         hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
 151
 152         return -EINVAL;
 153 }
 154
 155 void *ehca_poll_eq(struct ehca_shca *shca, struct ehca_eq *eq)
 156 {
 157         unsigned long flags;
 158         void *eqe;
 159
 160         spin_lock_irqsave(&eq->spinlock, flags);
 161         eqe = ipz_eqit_eq_get_inc_valid(&eq->ipz_queue);
 162         spin_unlock_irqrestore(&eq->spinlock, flags);
 163
 164         return eqe;
 165 }
 166
 167 int ehca_destroy_eq(struct ehca_shca *shca, struct ehca_eq *eq)
 168 {
 169         unsigned long flags;
 170         u64 h_ret;
 171
 172         ibmebus_free_irq(eq->ist, (void *)shca);
 173
 174         spin_lock_irqsave(&shca_list_lock, flags);
 175         eq->is_initialized = 0;
 176         spin_unlock_irqrestore(&shca_list_lock, flags);
 177
 178         tasklet_kill(&eq->interrupt_task);
 179
 180         h_ret = hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
 181
 182         if (h_ret != H_SUCCESS) {
 183                 ehca_err(&shca->ib_device, "Can't free EQ resources.");
 184                 return -EINVAL;
 185         }
 186         ipz_queue_dtor(NULL, &eq->ipz_queue);
 187
 188         return 0;
 189 }