summaryrefslogtreecommitdiff
path: root/drivers/s390/block/dasd_erp.c
blob: 4c0d3a704513cc9f602317ed899e961d2a842701 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
 *		    Horst Hummel <Horst.Hummel@de.ibm.com>
 *		    Carsten Otte <Cotte@de.ibm.com>
 *		    Martin Schwidefsky <schwidefsky@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * Copyright IBM Corp. 1999, 2001
 *
 */

#include <linux/ctype.h>
#include <linux/init.h>

#include <asm/debug.h>
#include <asm/ebcdic.h>
#include <linux/uaccess.h>

#include "dasd_int.h"

struct dasd_ccw_req *
dasd_alloc_erp_request(unsigned int magic, int cplength, int datasize,
		       struct dasd_device * device)
{
	unsigned long flags;
	struct dasd_ccw_req *cqr;
	char *data;
	int size;

	/* Sanity checks */
	BUG_ON(datasize > PAGE_SIZE ||
	       (cplength*sizeof(struct ccw1)) > PAGE_SIZE);

	size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
	if (cplength > 0)
		size += cplength * sizeof(struct ccw1);
	if (datasize > 0)
		size += datasize;
	spin_lock_irqsave(&device->mem_lock, flags);
	cqr = (struct dasd_ccw_req *)
		dasd_alloc_chunk(&device->erp_chunks, size);
	spin_unlock_irqrestore(&device->mem_lock, flags);
	if (cqr == NULL)
		return ERR_PTR(-ENOMEM);
	memset(cqr, 0, sizeof(struct dasd_ccw_req));
	INIT_LIST_HEAD(&cqr->devlist);
	INIT_LIST_HEAD(&cqr->blocklist);
	data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
	cqr->cpaddr = NULL;
	if (cplength > 0) {
		cqr->cpaddr = (struct ccw1 *) data;
		data += cplength*sizeof(struct ccw1);
		memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
	}
	cqr->data = NULL;
	if (datasize > 0) {
		cqr->data = data;
 		memset(cqr->data, 0, datasize);
	}
	cqr->magic = magic;
	ASCEBC((char *) &cqr->magic, 4);
	set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
	dasd_get_device(device);
	return cqr;
}

void
dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device)
{
	unsigned long flags;

	spin_lock_irqsave(&device->mem_lock, flags);
	dasd_free_chunk(&device->erp_chunks, cqr);
	spin_unlock_irqrestore(&device->mem_lock, flags);
	atomic_dec(&device->ref_count);
}


/*
 * dasd_default_erp_action just retries the current cqr
 */
struct dasd_ccw_req *
dasd_default_erp_action(struct dasd_ccw_req *cqr)
{
	struct dasd_device *device;

	device = cqr->startdev;

        /* just retry - there is nothing to save ... I got no sense data.... */
        if (cqr->retries > 0) {
		DBF_DEV_EVENT(DBF_DEBUG, device,
                             "default ERP called (%i retries left)",
                             cqr->retries);
		if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
			cqr->lpm = dasd_path_get_opm(device);
		cqr->status = DASD_CQR_FILLED;
        } else {
		pr_err("%s: default ERP has run out of retries and failed\n",
		       dev_name(&device->cdev->dev));
		cqr->status = DASD_CQR_FAILED;
		cqr->stopclk = get_tod_clock();
        }
        return cqr;
}				/* end dasd_default_erp_action */

/*
 * DESCRIPTION
 *   Frees all ERPs of the current ERP Chain and set the status
 *   of the original CQR either to DASD_CQR_DONE if ERP was successful
 *   or to DASD_CQR_FAILED if ERP was NOT successful.
 *   NOTE: This function is only called if no discipline postaction
 *	   is available
 *
 * PARAMETER
 *   erp		current erp_head
 *
 * RETURN VALUES
 *   cqr		pointer to the original CQR
 */
struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr)
{
	int success;
	unsigned long startclk, stopclk;
	struct dasd_device *startdev;

	BUG_ON(cqr->refers == NULL || cqr->function == NULL);

	success = cqr->status == DASD_CQR_DONE;
	startclk = cqr->startclk;
	stopclk = cqr->stopclk;
	startdev = cqr->startdev;

	/* free all ERPs - but NOT the original cqr */
	while (cqr->refers != NULL) {
		struct dasd_ccw_req *refers;

		refers = cqr->refers;
		/* remove the request from the block queue */
		list_del(&cqr->blocklist);
		/* free the finished erp request */
		dasd_free_erp_request(cqr, cqr->memdev);
		cqr = refers;
	}

	/* set corresponding status to original cqr */
	cqr->startclk = startclk;
	cqr->stopclk = stopclk;
	cqr->startdev = startdev;
	if (success)
		cqr->status = DASD_CQR_DONE;
	else {
		cqr->status = DASD_CQR_FAILED;
		cqr->stopclk = get_tod_clock();
	}

	return cqr;

}				/* end default_erp_postaction */

void
dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
{
	struct dasd_device *device;

	device = cqr->startdev;
	if (cqr->intrc == -ETIMEDOUT) {
		dev_err(&device->cdev->dev,
			"A timeout error occurred for cqr %px\n", cqr);
		return;
	}
	if (cqr->intrc == -ENOLINK) {
		dev_err(&device->cdev->dev,
			"A transport error occurred for cqr %px\n", cqr);
		return;
	}
	/* dump sense data */
	if (device->discipline && device->discipline->dump_sense)
		device->discipline->dump_sense(device, cqr, irb);
}

void
dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb)
{
	struct dasd_device *device;

	device = cqr->startdev;
	/* dump sense data to s390 debugfeature*/
	if (device->discipline && device->discipline->dump_sense_dbf)
		device->discipline->dump_sense_dbf(device, irb, "log");
}
EXPORT_SYMBOL(dasd_log_sense_dbf);

EXPORT_SYMBOL(dasd_default_erp_action);
EXPORT_SYMBOL(dasd_default_erp_postaction);
EXPORT_SYMBOL(dasd_alloc_erp_request);
EXPORT_SYMBOL(dasd_free_erp_request);
EXPORT_SYMBOL(dasd_log_sense);