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