summaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/ehca/ehca_eq.c
blob: 24ceab0bae4a5b9407e6a2b82ff115668830c04d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
/*
 *  IBM eServer eHCA Infiniband device driver for Linux on POWER
 *
 *  Event queue handling
 *
 *  Authors: Waleri Fomin <fomin@de.ibm.com>
 *           Khadija Souissi <souissi@de.ibm.com>
 *           Reinhard Ernst <rernst@de.ibm.com>
 *           Heiko J Schick <schickhj@de.ibm.com>
 *           Hoang-Nam Nguyen <hnguyen@de.ibm.com>
 *
 *
 *  Copyright (c) 2005 IBM Corporation
 *
 *  All rights reserved.
 *
 *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
 *  BSD.
 *
 * OpenIB BSD License
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials
 * provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "ehca_classes.h"
#include "ehca_irq.h"
#include "ehca_iverbs.h"
#include "ehca_qes.h"
#include "hcp_if.h"
#include "ipz_pt_fn.h"

int ehca_create_eq(struct ehca_shca *shca,
		   struct ehca_eq *eq,
		   const enum ehca_eq_type type, const u32 length)
{
	u64 ret;
	u32 nr_pages;
	u32 i;
	void *vpage;
	struct ib_device *ib_dev = &shca->ib_device;

	spin_lock_init(&eq->spinlock);
	eq->is_initialized = 0;

	if (type != EHCA_EQ && type != EHCA_NEQ) {
		ehca_err(ib_dev, "Invalid EQ type %x. eq=%p", type, eq);
		return -EINVAL;
	}
	if (!length) {
		ehca_err(ib_dev, "EQ length must not be zero. eq=%p", eq);
		return -EINVAL;
	}

	ret = hipz_h_alloc_resource_eq(shca->ipz_hca_handle,
				       &eq->pf,
				       type,
				       length,
				       &eq->ipz_eq_handle,
				       &eq->length,
				       &nr_pages, &eq->ist);

	if (ret != H_SUCCESS) {
		ehca_err(ib_dev, "Can't allocate EQ/NEQ. eq=%p", eq);
		return -EINVAL;
	}

	ret = ipz_queue_ctor(&eq->ipz_queue, nr_pages,
			     EHCA_PAGESIZE, sizeof(struct ehca_eqe), 0);
	if (!ret) {
		ehca_err(ib_dev, "Can't allocate EQ pages eq=%p", eq);
		goto create_eq_exit1;
	}

	for (i = 0; i < nr_pages; i++) {
		u64 rpage;

		if (!(vpage = ipz_qpageit_get_inc(&eq->ipz_queue))) {
			ret = H_RESOURCE;
			goto create_eq_exit2;
		}

		rpage = virt_to_abs(vpage);
		ret = hipz_h_register_rpage_eq(shca->ipz_hca_handle,
					       eq->ipz_eq_handle,
					       &eq->pf,
					       0, 0, rpage, 1);

		if (i == (nr_pages - 1)) {
			/* last page */
			vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
			if (ret != H_SUCCESS || vpage)
				goto create_eq_exit2;
		} else {
			if (ret != H_PAGE_REGISTERED || !vpage)
				goto create_eq_exit2;
		}
	}

	ipz_qeit_reset(&eq->ipz_queue);

	/* register interrupt handlers and initialize work queues */
	if (type == EHCA_EQ) {
		ret = ibmebus_request_irq(NULL, eq->ist, ehca_interrupt_eq,
					  IRQF_DISABLED, "ehca_eq",
					  (void *)shca);
		if (ret < 0)
			ehca_err(ib_dev, "Can't map interrupt handler.");

		tasklet_init(&eq->interrupt_task, ehca_tasklet_eq, (long)shca);
	} else if (type == EHCA_NEQ) {
		ret = ibmebus_request_irq(NULL, eq->ist, ehca_interrupt_neq,
					  IRQF_DISABLED, "ehca_neq",
					  (void *)shca);
		if (ret < 0)
			ehca_err(ib_dev, "Can't map interrupt handler.");

		tasklet_init(&eq->interrupt_task, ehca_tasklet_neq, (long)shca);
	}

	eq->is_initialized = 1;

	return 0;

create_eq_exit2:
	ipz_queue_dtor(&eq->ipz_queue);

create_eq_exit1:
	hipz_h_destroy_eq(shca->ipz_hca_handle, eq);

	return -EINVAL;
}

void *ehca_poll_eq(struct ehca_shca *shca, struct ehca_eq *eq)
{
	unsigned long flags;
	void *eqe;

	spin_lock_irqsave(&eq->spinlock, flags);
	eqe = ipz_eqit_eq_get_inc_valid(&eq->ipz_queue);
	spin_unlock_irqrestore(&eq->spinlock, flags);

	return eqe;
}

int ehca_destroy_eq(struct ehca_shca *shca, struct ehca_eq *eq)
{
	unsigned long flags;
	u64 h_ret;

	spin_lock_irqsave(&eq->spinlock, flags);
	ibmebus_free_irq(NULL, eq->ist, (void *)shca);

	h_ret = hipz_h_destroy_eq(shca->ipz_hca_handle, eq);

	spin_unlock_irqrestore(&eq->spinlock, flags);

	if (h_ret != H_SUCCESS) {
		ehca_err(&shca->ib_device, "Can't free EQ resources.");
		return -EINVAL;
	}
	ipz_queue_dtor(&eq->ipz_queue);

	return 0;
}