LXR linux/drivers/infiniband/hw/ehca/ehca

   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
  53int 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 = __pa(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                                          0, "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                                          0, "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
 146create_eq_exit2:
 147        ipz_queue_dtor(NULL, &eq->ipz_queue);
 148
 149create_eq_exit1:
 150        hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
 151
 152        return -EINVAL;
 153}
 154
 155void *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
 167int 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}
 190