1 /*
2 * File...........: linux/drivers/s390/block/dasd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
9 *
10 */
11
12 #include <linux/ctype.h>
13 #include <linux/init.h>
14
15 #include <asm/debug.h>
16 #include <asm/ebcdic.h>
17 #include <asm/uaccess.h>
18
19 /* This is ugly... */
20 #define PRINTK_HEADER "dasd_erp:"
21
22 #include "dasd_int.h"
23
24 struct dasd_ccw_req *
25 dasd_alloc_erp_request(char *magic, int cplength, int datasize,
26 struct dasd_device * device)
27 {
28 unsigned long flags;
29 struct dasd_ccw_req *cqr;
30 char *data;
31 int size;
32
33 /* Sanity checks */
34 BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
35 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
36
37 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
38 if (cplength > 0)
39 size += cplength * sizeof(struct ccw1);
40 if (datasize > 0)
41 size += datasize;
42 spin_lock_irqsave(&device->mem_lock, flags);
43 cqr = (struct dasd_ccw_req *)
44 dasd_alloc_chunk(&device->erp_chunks, size);
45 spin_unlock_irqrestore(&device->mem_lock, flags);
46 if (cqr == NULL)
47 return ERR_PTR(-ENOMEM);
48 memset(cqr, 0, sizeof(struct dasd_ccw_req));
49 INIT_LIST_HEAD(&cqr->devlist);
50 INIT_LIST_HEAD(&cqr->blocklist);
51 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
52 cqr->cpaddr = NULL;
53 if (cplength > 0) {
54 cqr->cpaddr = (struct ccw1 *) data;
55 data += cplength*sizeof(struct ccw1);
56 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
57 }
58 cqr->data = NULL;
59 if (datasize > 0) {
60 cqr->data = data;
61 memset(cqr->data, 0, datasize);
62 }
63 strncpy((char *) &cqr->magic, magic, 4);
64 ASCEBC((char *) &cqr->magic, 4);
65 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
66 dasd_get_device(device);
67 return cqr;
68 }
69
70 void
71 dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device)
72 {
73 unsigned long flags;
74
75 spin_lock_irqsave(&device->mem_lock, flags);
76 dasd_free_chunk(&device->erp_chunks, cqr);
77 spin_unlock_irqrestore(&device->mem_lock, flags);
78 atomic_dec(&device->ref_count);
79 }
80
81
82 /*
83 * dasd_default_erp_action just retries the current cqr
84 */
85 struct dasd_ccw_req *
86 dasd_default_erp_action(struct dasd_ccw_req *cqr)
87 {
88 struct dasd_device *device;
89
90 device = cqr->startdev;
91
92 /* just retry - there is nothing to save ... I got no sense data.... */
93 if (cqr->retries > 0) {
94 DEV_MESSAGE (KERN_DEBUG, device,
95 "default ERP called (%i retries left)",
96 cqr->retries);
97 cqr->lpm = LPM_ANYPATH;
98 cqr->status = DASD_CQR_FILLED;
99 } else {
100 DEV_MESSAGE (KERN_WARNING, device, "%s",
101 "default ERP called (NO retry left)");
102 cqr->status = DASD_CQR_FAILED;
103 cqr->stopclk = get_clock();
104 }
105 return cqr;
106 } /* end dasd_default_erp_action */
107
108 /*
109 * DESCRIPTION
110 * Frees all ERPs of the current ERP Chain and set the status
111 * of the original CQR either to DASD_CQR_DONE if ERP was successful
112 * or to DASD_CQR_FAILED if ERP was NOT successful.
113 * NOTE: This function is only called if no discipline postaction
114 * is available
115 *
116 * PARAMETER
117 * erp current erp_head
118 *
119 * RETURN VALUES
120 * cqr pointer to the original CQR
121 */
122 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr)
123 {
124 int success;
125
126 BUG_ON(cqr->refers == NULL || cqr->function == NULL);
127
128 success = cqr->status == DASD_CQR_DONE;
129
130 /* free all ERPs - but NOT the original cqr */
131 while (cqr->refers != NULL) {
132 struct dasd_ccw_req *refers;
133
134 refers = cqr->refers;
135 /* remove the request from the block queue */
136 list_del(&cqr->blocklist);
137 /* free the finished erp request */
138 dasd_free_erp_request(cqr, cqr->memdev);
139 cqr = refers;
140 }
141
142 /* set corresponding status to original cqr */
143 if (success)
144 cqr->status = DASD_CQR_DONE;
145 else {
146 cqr->status = DASD_CQR_FAILED;
147 cqr->stopclk = get_clock();
148 }
149
150 return cqr;
151
152 } /* end default_erp_postaction */
153
154 void
155 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
156 {
157 struct dasd_device *device;
158
159 device = cqr->startdev;
160 /* dump sense data */
161 if (device->discipline && device->discipline->dump_sense)
162 device->discipline->dump_sense(device, cqr, irb);
163 }
164
165 EXPORT_SYMBOL(dasd_default_erp_action);
166 EXPORT_SYMBOL(dasd_default_erp_postaction);
167 EXPORT_SYMBOL(dasd_alloc_erp_request);
168 EXPORT_SYMBOL(dasd_free_erp_request);
169 EXPORT_SYMBOL(dasd_log_sense);
170
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