summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/hfi1/intr.c
blob: 65348d16ab2f9d3193ec68476607f138b72491d9 (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
/*
 * Copyright(c) 2015, 2016 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License 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.
 *
 * 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.
 *  - Neither the name of Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 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 <linux/pci.h>
#include <linux/delay.h>

#include "hfi.h"
#include "common.h"
#include "sdma.h"

/**
 * format_hwmsg - format a single hwerror message
 * @msg message buffer
 * @msgl length of message buffer
 * @hwmsg message to add to message buffer
 */
static void format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
{
	strlcat(msg, "[", msgl);
	strlcat(msg, hwmsg, msgl);
	strlcat(msg, "]", msgl);
}

/**
 * hfi1_format_hwerrors - format hardware error messages for display
 * @hwerrs hardware errors bit vector
 * @hwerrmsgs hardware error descriptions
 * @nhwerrmsgs number of hwerrmsgs
 * @msg message buffer
 * @msgl message buffer length
 */
void hfi1_format_hwerrors(u64 hwerrs, const struct hfi1_hwerror_msgs *hwerrmsgs,
			  size_t nhwerrmsgs, char *msg, size_t msgl)
{
	int i;

	for (i = 0; i < nhwerrmsgs; i++)
		if (hwerrs & hwerrmsgs[i].mask)
			format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
}

static void signal_ib_event(struct hfi1_pportdata *ppd, enum ib_event_type ev)
{
	struct ib_event event;
	struct hfi1_devdata *dd = ppd->dd;

	/*
	 * Only call ib_dispatch_event() if the IB device has been
	 * registered.  HFI1_INITED is set iff the driver has successfully
	 * registered with the IB core.
	 */
	if (!(dd->flags & HFI1_INITTED))
		return;
	event.device = &dd->verbs_dev.rdi.ibdev;
	event.element.port_num = ppd->port;
	event.event = ev;
	ib_dispatch_event(&event);
}

/*
 * Handle a linkup or link down notification.
 * This is called outside an interrupt.
 */
void handle_linkup_change(struct hfi1_devdata *dd, u32 linkup)
{
	struct hfi1_pportdata *ppd = &dd->pport[0];
	enum ib_event_type ev;

	if (!(ppd->linkup ^ !!linkup))
		return;	/* no change, nothing to do */

	if (linkup) {
		/*
		 * Quick linkup and all link up on the simulator does not
		 * trigger or implement:
		 *	- VerifyCap interrupt
		 *	- VerifyCap frames
		 * But rather moves directly to LinkUp.
		 *
		 * Do the work of the VerifyCap interrupt handler,
		 * handle_verify_cap(), but do not try moving the state to
		 * LinkUp as we are already there.
		 *
		 * NOTE: This uses this device's vAU, vCU, and vl15_init for
		 * the remote values.  Both sides must be using the values.
		 */
		if (quick_linkup || dd->icode == ICODE_FUNCTIONAL_SIMULATOR) {
			set_up_vl15(dd, dd->vau, dd->vl15_init);
			assign_remote_cm_au_table(dd, dd->vcu);
			ppd->neighbor_guid =
				read_csr(dd, DC_DC8051_STS_REMOTE_GUID);
			ppd->neighbor_type =
				read_csr(dd, DC_DC8051_STS_REMOTE_NODE_TYPE) &
					DC_DC8051_STS_REMOTE_NODE_TYPE_VAL_MASK;
			ppd->neighbor_port_number =
				read_csr(dd, DC_DC8051_STS_REMOTE_PORT_NO) &
					 DC_DC8051_STS_REMOTE_PORT_NO_VAL_SMASK;
			dd_dev_info(dd, "Neighbor GUID: %llx Neighbor type %d\n",
				    ppd->neighbor_guid,
				    ppd->neighbor_type);
		}

		/* physical link went up */
		ppd->linkup = 1;
		ppd->offline_disabled_reason =
			HFI1_ODR_MASK(OPA_LINKDOWN_REASON_NONE);

		/* link widths are not available until the link is fully up */
		get_linkup_link_widths(ppd);

	} else {
		/* physical link went down */
		ppd->linkup = 0;

		/* clear HW details of the previous connection */
		reset_link_credits(dd);

		/* freeze after a link down to guarantee a clean egress */
		start_freeze_handling(ppd, FREEZE_SELF | FREEZE_LINK_DOWN);

		ev = IB_EVENT_PORT_ERR;

		hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LINKDOWN_BIT);

		/* if we are down, the neighbor is down */
		ppd->neighbor_normal = 0;

		/* notify IB of the link change */
		signal_ib_event(ppd, ev);
	}
}

/*
 * Handle receive or urgent interrupts for user contexts.  This means a user
 * process was waiting for a packet to arrive, and didn't want to poll.
 */
void handle_user_interrupt(struct hfi1_ctxtdata *rcd)
{
	struct hfi1_devdata *dd = rcd->dd;
	unsigned long flags;

	spin_lock_irqsave(&dd->uctxt_lock, flags);
	if (!rcd->cnt)
		goto done;

	if (test_and_clear_bit(HFI1_CTXT_WAITING_RCV, &rcd->event_flags)) {
		wake_up_interruptible(&rcd->wait);
		hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_DIS, rcd->ctxt);
	} else if (test_and_clear_bit(HFI1_CTXT_WAITING_URG,
							&rcd->event_flags)) {
		rcd->urgent++;
		wake_up_interruptible(&rcd->wait);
	}
done:
	spin_unlock_irqrestore(&dd->uctxt_lock, flags);
}
OpenPOWER on IntegriCloud