aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/s390/block/dasd_erp.c
blob: 58a65097922bb430d3f8e6b224755596e71fb746 (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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
/*
 * File...........: linux/drivers/s390/block/dasd.c
 * 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>
 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
 *
 */

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

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

/* This is ugly... */
#define PRINTK_HEADER "dasd_erp:"

#include "dasd_int.h"

struct dasd_ccw_req *
dasd_alloc_erp_request(char *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( magic == NULL || 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));
	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);
	}
	strncpy((char *) &cqr->magic, magic, 4);
	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->device;

        /* just retry - there is nothing to save ... I got no sense data.... */
        if (cqr->retries > 0) {
		DEV_MESSAGE (KERN_DEBUG, device,
                             "default ERP called (%i retries left)",
                             cqr->retries);
		cqr->lpm    = LPM_ANYPATH;
		cqr->status = DASD_CQR_QUEUED;
        } else {
                DEV_MESSAGE (KERN_WARNING, device, "%s",
			     "default ERP called (NO retry left)");
		cqr->status = DASD_CQR_FAILED;
		cqr->stopclk = get_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)
{
	struct dasd_device *device;
	int success;

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

	device = cqr->device;
	success = cqr->status == DASD_CQR_DONE;

	/* 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 device queue */
		list_del(&cqr->list);
		/* free the finished erp request */
		dasd_free_erp_request(cqr, device);
		cqr = refers;
	}

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

	return cqr;

}				/* end default_erp_postaction */

/*
 * Print the hex dump of the memory used by a request. This includes
 * all error recovery ccws that have been chained in from of the
 * real request.
 */
static inline void
hex_dump_memory(struct dasd_device *device, void *data, int len)
{
	int *pint;

	pint = (int *) data;
	while (len > 0) {
		DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
			    pint, pint[0], pint[1], pint[2], pint[3]);
		pint += 4;
		len -= 16;
	}
}

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

	device = cqr->device;
	/* dump sense data */
	if (device->discipline && device->discipline->dump_sense)
		device->discipline->dump_sense(device, cqr, irb);
}

void
dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
{
	struct dasd_device *device;
	struct dasd_ccw_req *lcqr;
	struct ccw1 *ccw;
	int cplength;

	device = cqr->device;
	/* log the channel program */
	for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
		DEV_MESSAGE(KERN_ERR, device,
			    "(%s) ERP chain report for req: %p",
			    caller == 0 ? "EXAMINE" : "ACTION", lcqr);
		hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));

		cplength = 1;
		ccw = lcqr->cpaddr;
		while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
			cplength++;

		if (cplength > 40) {	/* log only parts of the CP */
			DEV_MESSAGE(KERN_ERR, device, "%s",
				    "Start of channel program:");
			hex_dump_memory(device, lcqr->cpaddr,
					40*sizeof(struct ccw1));

			DEV_MESSAGE(KERN_ERR, device, "%s",
				    "End of channel program:");
			hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
					10*sizeof(struct ccw1));
		} else {	/* log the whole CP */
			DEV_MESSAGE(KERN_ERR, device, "%s",
				    "Channel program (complete):");
			hex_dump_memory(device, lcqr->cpaddr,
					cplength*sizeof(struct ccw1));
		}

		if (lcqr != cqr)
			continue;

		/*
		 * Log bytes arround failed CCW but only if we did
		 * not log the whole CP of the CCW is outside the
		 * logged CP.
		 */
		if (cplength > 40 ||
		    ((addr_t) cpa < (addr_t) lcqr->cpaddr &&
		     (addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {

			DEV_MESSAGE(KERN_ERR, device,
				    "Failed CCW (%p) (area):",
				    (void *) (long) cpa);
			hex_dump_memory(device, cqr->cpaddr - 10,
					20*sizeof(struct ccw1));
		}
	}

}				/* end log_erp_chain */

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);
EXPORT_SYMBOL(dasd_log_ccw);