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