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Heiko J Schickfab97222006-09-22 15:22:22 -07001/*
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 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);
Hoang-Nam Nguyen78d8d5f2007-02-15 17:06:33 +010064 spin_lock_init(&eq->irq_spinlock);
Heiko J Schickfab97222006-09-22 15:22:22 -070065 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(&eq->ipz_queue, nr_pages,
90 EHCA_PAGESIZE, sizeof(struct ehca_eqe), 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
Hoang-Nam Nguyen2b943972007-07-12 17:53:47 +020099 vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
100 if (!vpage) {
Heiko J Schickfab97222006-09-22 15:22:22 -0700101 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(NULL, eq->ist, ehca_interrupt_eq,
Thomas Gleixner38515e92007-02-14 00:33:16 -0800127 IRQF_DISABLED, "ehca_eq",
Heiko J Schickfab97222006-09-22 15:22:22 -0700128 (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(NULL, eq->ist, ehca_interrupt_neq,
Thomas Gleixner38515e92007-02-14 00:33:16 -0800135 IRQF_DISABLED, "ehca_neq",
Heiko J Schickfab97222006-09-22 15:22:22 -0700136 (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
147create_eq_exit2:
148 ipz_queue_dtor(&eq->ipz_queue);
149
150create_eq_exit1:
151 hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
152
153 return -EINVAL;
154}
155
156void *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
168int 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(NULL, 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(&eq->ipz_queue);
185
186 return 0;
187}