summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/bfa/bfad_intr.c
blob: 2b7dbecbebcaddf2ddd1873e55f6c64adaaee662 (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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/*
 * Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
 * All rights reserved
 * www.brocade.com
 *
 * Linux driver for Brocade Fibre Channel Host Bus Adapter.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License (GPL) Version 2 as
 * published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include "bfad_drv.h"
#include "bfad_trcmod.h"

BFA_TRC_FILE(LDRV, INTR);

/**
 *  bfa_isr BFA driver interrupt functions
 */
static int msix_disable_cb;
static int msix_disable_ct;
module_param(msix_disable_cb, int, S_IRUGO | S_IWUSR);
module_param(msix_disable_ct, int, S_IRUGO | S_IWUSR);
/**
 * Line based interrupt handler.
 */
static irqreturn_t
bfad_intx(int irq, void *dev_id)
{
	struct bfad_s         *bfad = dev_id;
	struct list_head         doneq;
	unsigned long   flags;
	bfa_boolean_t rc;

	spin_lock_irqsave(&bfad->bfad_lock, flags);
	rc = bfa_intx(&bfad->bfa);
	if (!rc) {
		spin_unlock_irqrestore(&bfad->bfad_lock, flags);
		return IRQ_NONE;
	}

	bfa_comp_deq(&bfad->bfa, &doneq);
	spin_unlock_irqrestore(&bfad->bfad_lock, flags);

	if (!list_empty(&doneq)) {
		bfa_comp_process(&bfad->bfa, &doneq);

		spin_lock_irqsave(&bfad->bfad_lock, flags);
		bfa_comp_free(&bfad->bfa, &doneq);
		spin_unlock_irqrestore(&bfad->bfad_lock, flags);
		bfa_trc_fp(bfad, irq);
	}

	return IRQ_HANDLED;

}

static irqreturn_t
bfad_msix(int irq, void *dev_id)
{
	struct bfad_msix_s *vec = dev_id;
	struct bfad_s *bfad = vec->bfad;
	struct list_head doneq;
	unsigned long   flags;

	spin_lock_irqsave(&bfad->bfad_lock, flags);

	bfa_msix(&bfad->bfa, vec->msix.entry);
	bfa_comp_deq(&bfad->bfa, &doneq);
	spin_unlock_irqrestore(&bfad->bfad_lock, flags);

	if (!list_empty(&doneq)) {
		bfa_comp_process(&bfad->bfa, &doneq);

		spin_lock_irqsave(&bfad->bfad_lock, flags);
		bfa_comp_free(&bfad->bfa, &doneq);
		spin_unlock_irqrestore(&bfad->bfad_lock, flags);
	}

	return IRQ_HANDLED;
}

/**
 * Initialize the MSIX entry table.
 */
static void
bfad_init_msix_entry(struct bfad_s *bfad, struct msix_entry *msix_entries,
			 int mask, int max_bit)
{
	int             i;
	int             match = 0x00000001;

	for (i = 0, bfad->nvec = 0; i < MAX_MSIX_ENTRY; i++) {
		if (mask & match) {
			bfad->msix_tab[bfad->nvec].msix.entry = i;
			bfad->msix_tab[bfad->nvec].bfad = bfad;
			msix_entries[bfad->nvec].entry = i;
			bfad->nvec++;
		}

		match <<= 1;
	}

}

int
bfad_install_msix_handler(struct bfad_s *bfad)
{
	int             i, error = 0;

	for (i = 0; i < bfad->nvec; i++) {
		error = request_irq(bfad->msix_tab[i].msix.vector,
				    (irq_handler_t) bfad_msix, 0,
				    BFAD_DRIVER_NAME, &bfad->msix_tab[i]);
		bfa_trc(bfad, i);
		bfa_trc(bfad, bfad->msix_tab[i].msix.vector);
		if (error) {
			int             j;

			for (j = 0; j < i; j++)
				free_irq(bfad->msix_tab[j].msix.vector,
						&bfad->msix_tab[j]);

			return 1;
		}
	}

	return 0;
}

/**
 * Setup MSIX based interrupt.
 */
int
bfad_setup_intr(struct bfad_s *bfad)
{
	int error = 0;
	u32 mask = 0, i, num_bit = 0, max_bit = 0;
	struct msix_entry msix_entries[MAX_MSIX_ENTRY];
	struct pci_dev *pdev = bfad->pcidev;

	/* Call BFA to get the msix map for this PCI function.  */
	bfa_msix_getvecs(&bfad->bfa, &mask, &num_bit, &max_bit);

	/* Set up the msix entry table */
	bfad_init_msix_entry(bfad, msix_entries, mask, max_bit);

	if ((pdev->device == BFA_PCI_DEVICE_ID_CT && !msix_disable_ct) ||
	    (pdev->device != BFA_PCI_DEVICE_ID_CT && !msix_disable_cb)) {

		error = pci_enable_msix(bfad->pcidev, msix_entries, bfad->nvec);
		if (error) {
			/*
			 * Only error number of vector is available.
			 * We don't have a mechanism to map multiple
			 * interrupts into one vector, so even if we
			 * can try to request less vectors, we don't
			 * know how to associate interrupt events to
			 *  vectors. Linux doesn't dupicate vectors
			 * in the MSIX table for this case.
			 */

			printk(KERN_WARNING "bfad%d: "
				"pci_enable_msix failed (%d),"
				" use line based.\n", bfad->inst_no, error);

			goto line_based;
		}

		/* Save the vectors */
		for (i = 0; i < bfad->nvec; i++) {
			bfa_trc(bfad, msix_entries[i].vector);
			bfad->msix_tab[i].msix.vector = msix_entries[i].vector;
		}

		bfa_msix_init(&bfad->bfa, bfad->nvec);

		bfad->bfad_flags |= BFAD_MSIX_ON;

		return error;
	}

line_based:
	error = 0;
	if (request_irq
	    (bfad->pcidev->irq, (irq_handler_t) bfad_intx, BFAD_IRQ_FLAGS,
	     BFAD_DRIVER_NAME, bfad) != 0) {
		/* Enable interrupt handler failed */
		return 1;
	}

	return error;
}

void
bfad_remove_intr(struct bfad_s *bfad)
{
	int             i;

	if (bfad->bfad_flags & BFAD_MSIX_ON) {
		for (i = 0; i < bfad->nvec; i++)
			free_irq(bfad->msix_tab[i].msix.vector,
					&bfad->msix_tab[i]);

		pci_disable_msix(bfad->pcidev);
		bfad->bfad_flags &= ~BFAD_MSIX_ON;
	} else {
		free_irq(bfad->pcidev->irq, bfad);
	}
}