IB/ehca: Support small QP queues
[linux-2.6.git] / 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(NULL, 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(NULL, 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(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(NULL, &eq->ipz_queue);
185
186         return 0;
187 }