summaryrefslogtreecommitdiff
path: root/drivers/scsi/snic/snic_isr.c
blob: f552003128c6e7899362012766d0eea4f7f6f1cd (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
/*
 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/string.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/interrupt.h>

#include "vnic_dev.h"
#include "vnic_intr.h"
#include "vnic_stats.h"
#include "snic_io.h"
#include "snic.h"


/*
 * snic_isr_msix_wq : MSIx ISR for work queue.
 */

static irqreturn_t
snic_isr_msix_wq(int irq, void *data)
{
	struct snic *snic = data;
	unsigned long wq_work_done = 0;

	snic->s_stats.misc.last_isr_time = jiffies;
	atomic64_inc(&snic->s_stats.misc.ack_isr_cnt);

	wq_work_done = snic_wq_cmpl_handler(snic, -1);
	svnic_intr_return_credits(&snic->intr[SNIC_MSIX_WQ],
				  wq_work_done,
				  1 /* unmask intr */,
				  1 /* reset intr timer */);

	return IRQ_HANDLED;
} /* end of snic_isr_msix_wq */

static irqreturn_t
snic_isr_msix_io_cmpl(int irq, void *data)
{
	struct snic *snic = data;
	unsigned long iocmpl_work_done = 0;

	snic->s_stats.misc.last_isr_time = jiffies;
	atomic64_inc(&snic->s_stats.misc.cmpl_isr_cnt);

	iocmpl_work_done = snic_fwcq_cmpl_handler(snic, -1);
	svnic_intr_return_credits(&snic->intr[SNIC_MSIX_IO_CMPL],
				  iocmpl_work_done,
				  1 /* unmask intr */,
				  1 /* reset intr timer */);

	return IRQ_HANDLED;
} /* end of snic_isr_msix_io_cmpl */

static irqreturn_t
snic_isr_msix_err_notify(int irq, void *data)
{
	struct snic *snic = data;

	snic->s_stats.misc.last_isr_time = jiffies;
	atomic64_inc(&snic->s_stats.misc.errnotify_isr_cnt);

	svnic_intr_return_all_credits(&snic->intr[SNIC_MSIX_ERR_NOTIFY]);
	snic_log_q_error(snic);

	/*Handling link events */
	snic_handle_link_event(snic);

	return IRQ_HANDLED;
} /* end of snic_isr_msix_err_notify */


void
snic_free_intr(struct snic *snic)
{
	int i;

	/* ONLY interrupt mode MSIX is supported */
	for (i = 0; i < ARRAY_SIZE(snic->msix); i++) {
		if (snic->msix[i].requested) {
			free_irq(snic->msix_entry[i].vector,
				 snic->msix[i].devid);
		}
	}
} /* end of snic_free_intr */

int
snic_request_intr(struct snic *snic)
{
	int ret = 0, i;
	enum vnic_dev_intr_mode intr_mode;

	intr_mode = svnic_dev_get_intr_mode(snic->vdev);
	SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX);

	/*
	 * Currently HW supports single WQ and CQ. So passing devid as snic.
	 * When hardware supports multiple WQs and CQs, one idea is
	 * to pass devid as corresponding WQ or CQ ptr and retrieve snic
	 * from queue ptr.
	 * Except for err_notify, which is always one.
	 */
	sprintf(snic->msix[SNIC_MSIX_WQ].devname,
		"%.11s-scsi-wq",
		snic->name);
	snic->msix[SNIC_MSIX_WQ].isr = snic_isr_msix_wq;
	snic->msix[SNIC_MSIX_WQ].devid = snic;

	sprintf(snic->msix[SNIC_MSIX_IO_CMPL].devname,
		"%.11s-io-cmpl",
		snic->name);
	snic->msix[SNIC_MSIX_IO_CMPL].isr = snic_isr_msix_io_cmpl;
	snic->msix[SNIC_MSIX_IO_CMPL].devid = snic;

	sprintf(snic->msix[SNIC_MSIX_ERR_NOTIFY].devname,
		"%.11s-err-notify",
		snic->name);
	snic->msix[SNIC_MSIX_ERR_NOTIFY].isr = snic_isr_msix_err_notify;
	snic->msix[SNIC_MSIX_ERR_NOTIFY].devid = snic;

	for (i = 0; i < ARRAY_SIZE(snic->msix); i++) {
		ret = request_irq(snic->msix_entry[i].vector,
				  snic->msix[i].isr,
				  0,
				  snic->msix[i].devname,
				  snic->msix[i].devid);
		if (ret) {
			SNIC_HOST_ERR(snic->shost,
				      "MSI-X: requrest_irq(%d) failed %d\n",
				      i,
				      ret);
			snic_free_intr(snic);
			break;
		}
		snic->msix[i].requested = 1;
	}

	return ret;
} /* end of snic_requrest_intr */

int
snic_set_intr_mode(struct snic *snic)
{
	unsigned int n = ARRAY_SIZE(snic->wq);
	unsigned int m = SNIC_CQ_IO_CMPL_MAX;
	unsigned int i;

	/*
	 * We need n WQs, m CQs, and n+m+1 INTRs
	 * (last INTR is used for WQ/CQ errors and notification area
	 */

	BUILD_BUG_ON((ARRAY_SIZE(snic->wq) + SNIC_CQ_IO_CMPL_MAX) >
			ARRAY_SIZE(snic->intr));
	SNIC_BUG_ON(ARRAY_SIZE(snic->msix_entry) < (n + m + 1));

	for (i = 0; i < (n + m + 1); i++)
		snic->msix_entry[i].entry = i;

	if (snic->wq_count >= n && snic->cq_count >= (n + m)) {
		if (!pci_enable_msix(snic->pdev,
				     snic->msix_entry,
				     (n + m + 1))) {
			snic->wq_count = n;
			snic->cq_count = n + m;
			snic->intr_count = n + m + 1;
			snic->err_intr_offset = SNIC_MSIX_ERR_NOTIFY;

			SNIC_ISR_DBG(snic->shost,
				     "Using MSI-X Interrupts\n");
			svnic_dev_set_intr_mode(snic->vdev,
						VNIC_DEV_INTR_MODE_MSIX);

			return 0;
		}
	}

	svnic_dev_set_intr_mode(snic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);

	return -EINVAL;
} /* end of snic_set_intr_mode */

void
snic_clear_intr_mode(struct snic *snic)
{
	pci_disable_msix(snic->pdev);

	svnic_dev_set_intr_mode(snic->vdev, VNIC_DEV_INTR_MODE_INTX);
}