1/*
2 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses.  You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 *     Redistribution and use in source and binary forms, with or
11 *     without modification, are permitted provided that the following
12 *     conditions are met:
13 *
14 *      - Redistributions of source code must retain the above
15 *        copyright notice, this list of conditions and the following
16 *        disclaimer.
17 *
18 *      - Redistributions in binary form must reproduce the above
19 *        copyright notice, this list of conditions and the following
20 *        disclaimer in the documentation and/or other materials
21 *        provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 * $Id: mthca_catas.c,v 1.1.1.1 2007/08/03 18:52:32 Exp $
33 */
34
35#include <linux/jiffies.h>
36#include <linux/timer.h>
37#include <linux/workqueue.h>
38
39#include "mthca_dev.h"
40
41enum {
42	MTHCA_CATAS_POLL_INTERVAL	= 5 * HZ,
43
44	MTHCA_CATAS_TYPE_INTERNAL	= 0,
45	MTHCA_CATAS_TYPE_UPLINK		= 3,
46	MTHCA_CATAS_TYPE_DDR		= 4,
47	MTHCA_CATAS_TYPE_PARITY		= 5,
48};
49
50static DEFINE_SPINLOCK(catas_lock);
51
52static LIST_HEAD(catas_list);
53static struct workqueue_struct *catas_wq;
54static struct work_struct catas_work;
55
56static int catas_reset_disable;
57module_param_named(catas_reset_disable, catas_reset_disable, int, 0644);
58MODULE_PARM_DESC(catas_reset_disable, "disable reset on catastrophic event if nonzero");
59
60static void catas_reset(struct work_struct *work)
61{
62	struct mthca_dev *dev, *tmpdev;
63	LIST_HEAD(tlist);
64	int ret;
65
66	mutex_lock(&mthca_device_mutex);
67
68	spin_lock_irq(&catas_lock);
69	list_splice_init(&catas_list, &tlist);
70	spin_unlock_irq(&catas_lock);
71
72	list_for_each_entry_safe(dev, tmpdev, &tlist, catas_err.list) {
73		ret = __mthca_restart_one(dev->pdev);
74		if (ret)
75			mthca_err(dev, "Reset failed (%d)\n", ret);
76		else
77			mthca_dbg(dev, "Reset succeeded\n");
78	}
79
80	mutex_unlock(&mthca_device_mutex);
81}
82
83static void handle_catas(struct mthca_dev *dev)
84{
85	struct ib_event event;
86	unsigned long flags;
87	const char *type;
88	int i;
89
90	event.device = &dev->ib_dev;
91	event.event  = IB_EVENT_DEVICE_FATAL;
92	event.element.port_num = 0;
93
94	ib_dispatch_event(&event);
95
96	switch (swab32(readl(dev->catas_err.map)) >> 24) {
97	case MTHCA_CATAS_TYPE_INTERNAL:
98		type = "internal error";
99		break;
100	case MTHCA_CATAS_TYPE_UPLINK:
101		type = "uplink bus error";
102		break;
103	case MTHCA_CATAS_TYPE_DDR:
104		type = "DDR data error";
105		break;
106	case MTHCA_CATAS_TYPE_PARITY:
107		type = "internal parity error";
108		break;
109	default:
110		type = "unknown error";
111		break;
112	}
113
114	mthca_err(dev, "Catastrophic error detected: %s\n", type);
115	for (i = 0; i < dev->catas_err.size; ++i)
116		mthca_err(dev, "  buf[%02x]: %08x\n",
117			  i, swab32(readl(dev->catas_err.map + i)));
118
119	if (catas_reset_disable)
120		return;
121
122	spin_lock_irqsave(&catas_lock, flags);
123	list_add(&dev->catas_err.list, &catas_list);
124	queue_work(catas_wq, &catas_work);
125	spin_unlock_irqrestore(&catas_lock, flags);
126}
127
128static void poll_catas(unsigned long dev_ptr)
129{
130	struct mthca_dev *dev = (struct mthca_dev *) dev_ptr;
131	unsigned long flags;
132	int i;
133
134	for (i = 0; i < dev->catas_err.size; ++i)
135		if (readl(dev->catas_err.map + i)) {
136			handle_catas(dev);
137			return;
138		}
139
140	spin_lock_irqsave(&catas_lock, flags);
141	if (!dev->catas_err.stop)
142		mod_timer(&dev->catas_err.timer,
143			  jiffies + MTHCA_CATAS_POLL_INTERVAL);
144	spin_unlock_irqrestore(&catas_lock, flags);
145
146	return;
147}
148
149void mthca_start_catas_poll(struct mthca_dev *dev)
150{
151	unsigned long addr;
152
153	init_timer(&dev->catas_err.timer);
154	dev->catas_err.stop = 0;
155	dev->catas_err.map  = NULL;
156
157	addr = pci_resource_start(dev->pdev, 0) +
158		((pci_resource_len(dev->pdev, 0) - 1) &
159		 dev->catas_err.addr);
160
161	if (!request_mem_region(addr, dev->catas_err.size * 4,
162				DRV_NAME)) {
163		mthca_warn(dev, "couldn't request catastrophic error region "
164			   "at 0x%lx/0x%x\n", addr, dev->catas_err.size * 4);
165		return;
166	}
167
168	dev->catas_err.map = ioremap(addr, dev->catas_err.size * 4);
169	if (!dev->catas_err.map) {
170		mthca_warn(dev, "couldn't map catastrophic error region "
171			   "at 0x%lx/0x%x\n", addr, dev->catas_err.size * 4);
172		release_mem_region(addr, dev->catas_err.size * 4);
173		return;
174	}
175
176	dev->catas_err.timer.data     = (unsigned long) dev;
177	dev->catas_err.timer.function = poll_catas;
178	dev->catas_err.timer.expires  = jiffies + MTHCA_CATAS_POLL_INTERVAL;
179	INIT_LIST_HEAD(&dev->catas_err.list);
180	add_timer(&dev->catas_err.timer);
181}
182
183void mthca_stop_catas_poll(struct mthca_dev *dev)
184{
185	spin_lock_irq(&catas_lock);
186	dev->catas_err.stop = 1;
187	spin_unlock_irq(&catas_lock);
188
189	del_timer_sync(&dev->catas_err.timer);
190
191	if (dev->catas_err.map) {
192		iounmap(dev->catas_err.map);
193		release_mem_region(pci_resource_start(dev->pdev, 0) +
194				   ((pci_resource_len(dev->pdev, 0) - 1) &
195				    dev->catas_err.addr),
196				   dev->catas_err.size * 4);
197	}
198
199	spin_lock_irq(&catas_lock);
200	list_del(&dev->catas_err.list);
201	spin_unlock_irq(&catas_lock);
202}
203
204int __init mthca_catas_init(void)
205{
206	INIT_WORK(&catas_work, catas_reset);
207
208	catas_wq = create_singlethread_workqueue("mthca_catas");
209	if (!catas_wq)
210		return -ENOMEM;
211
212	return 0;
213}
214
215void mthca_catas_cleanup(void)
216{
217	destroy_workqueue(catas_wq);
218}
219