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1da177e4 LT |
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 | * | |
1da177e4 LT |
10 | */ |
11 | ||
fc19f381 SH |
12 | #define KMSG_COMPONENT "dasd" |
13 | ||
1da177e4 LT |
14 | #include <linux/ctype.h> |
15 | #include <linux/init.h> | |
16 | ||
17 | #include <asm/debug.h> | |
18 | #include <asm/ebcdic.h> | |
19 | #include <asm/uaccess.h> | |
20 | ||
21 | /* This is ugly... */ | |
22 | #define PRINTK_HEADER "dasd_erp:" | |
23 | ||
24 | #include "dasd_int.h" | |
25 | ||
26 | struct dasd_ccw_req * | |
27 | dasd_alloc_erp_request(char *magic, int cplength, int datasize, | |
28 | struct dasd_device * device) | |
29 | { | |
30 | unsigned long flags; | |
31 | struct dasd_ccw_req *cqr; | |
32 | char *data; | |
33 | int size; | |
34 | ||
35 | /* Sanity checks */ | |
e048a8a6 ES |
36 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
37 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
38 | |
39 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
40 | if (cplength > 0) | |
41 | size += cplength * sizeof(struct ccw1); | |
42 | if (datasize > 0) | |
43 | size += datasize; | |
44 | spin_lock_irqsave(&device->mem_lock, flags); | |
45 | cqr = (struct dasd_ccw_req *) | |
46 | dasd_alloc_chunk(&device->erp_chunks, size); | |
47 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
48 | if (cqr == NULL) | |
49 | return ERR_PTR(-ENOMEM); | |
50 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
8e09f215 SW |
51 | INIT_LIST_HEAD(&cqr->devlist); |
52 | INIT_LIST_HEAD(&cqr->blocklist); | |
1da177e4 LT |
53 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); |
54 | cqr->cpaddr = NULL; | |
55 | if (cplength > 0) { | |
56 | cqr->cpaddr = (struct ccw1 *) data; | |
57 | data += cplength*sizeof(struct ccw1); | |
58 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
59 | } | |
60 | cqr->data = NULL; | |
61 | if (datasize > 0) { | |
62 | cqr->data = data; | |
63 | memset(cqr->data, 0, datasize); | |
64 | } | |
65 | strncpy((char *) &cqr->magic, magic, 4); | |
66 | ASCEBC((char *) &cqr->magic, 4); | |
67 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
68 | dasd_get_device(device); | |
69 | return cqr; | |
70 | } | |
71 | ||
72 | void | |
8e09f215 | 73 | dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device) |
1da177e4 LT |
74 | { |
75 | unsigned long flags; | |
76 | ||
77 | spin_lock_irqsave(&device->mem_lock, flags); | |
78 | dasd_free_chunk(&device->erp_chunks, cqr); | |
79 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
80 | atomic_dec(&device->ref_count); | |
81 | } | |
82 | ||
83 | ||
84 | /* | |
85 | * dasd_default_erp_action just retries the current cqr | |
86 | */ | |
87 | struct dasd_ccw_req * | |
8e09f215 | 88 | dasd_default_erp_action(struct dasd_ccw_req *cqr) |
1da177e4 LT |
89 | { |
90 | struct dasd_device *device; | |
91 | ||
8e09f215 | 92 | device = cqr->startdev; |
1da177e4 LT |
93 | |
94 | /* just retry - there is nothing to save ... I got no sense data.... */ | |
95 | if (cqr->retries > 0) { | |
fc19f381 | 96 | DBF_DEV_EVENT(DBF_DEBUG, device, |
1da177e4 LT |
97 | "default ERP called (%i retries left)", |
98 | cqr->retries); | |
99 | cqr->lpm = LPM_ANYPATH; | |
8e09f215 | 100 | cqr->status = DASD_CQR_FILLED; |
1da177e4 | 101 | } else { |
ca99dab0 SH |
102 | pr_err("%s: default ERP has run out of retries and failed\n", |
103 | dev_name(&device->cdev->dev)); | |
1da177e4 | 104 | cqr->status = DASD_CQR_FAILED; |
8e09f215 | 105 | cqr->stopclk = get_clock(); |
1da177e4 LT |
106 | } |
107 | return cqr; | |
108 | } /* end dasd_default_erp_action */ | |
109 | ||
110 | /* | |
111 | * DESCRIPTION | |
112 | * Frees all ERPs of the current ERP Chain and set the status | |
113 | * of the original CQR either to DASD_CQR_DONE if ERP was successful | |
114 | * or to DASD_CQR_FAILED if ERP was NOT successful. | |
115 | * NOTE: This function is only called if no discipline postaction | |
116 | * is available | |
117 | * | |
118 | * PARAMETER | |
119 | * erp current erp_head | |
120 | * | |
121 | * RETURN VALUES | |
122 | * cqr pointer to the original CQR | |
123 | */ | |
8e09f215 | 124 | struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr) |
1da177e4 | 125 | { |
1da177e4 LT |
126 | int success; |
127 | ||
e048a8a6 | 128 | BUG_ON(cqr->refers == NULL || cqr->function == NULL); |
1da177e4 | 129 | |
1da177e4 LT |
130 | success = cqr->status == DASD_CQR_DONE; |
131 | ||
132 | /* free all ERPs - but NOT the original cqr */ | |
133 | while (cqr->refers != NULL) { | |
134 | struct dasd_ccw_req *refers; | |
135 | ||
136 | refers = cqr->refers; | |
8e09f215 SW |
137 | /* remove the request from the block queue */ |
138 | list_del(&cqr->blocklist); | |
1da177e4 | 139 | /* free the finished erp request */ |
8e09f215 | 140 | dasd_free_erp_request(cqr, cqr->memdev); |
1da177e4 LT |
141 | cqr = refers; |
142 | } | |
143 | ||
144 | /* set corresponding status to original cqr */ | |
145 | if (success) | |
146 | cqr->status = DASD_CQR_DONE; | |
147 | else { | |
148 | cqr->status = DASD_CQR_FAILED; | |
149 | cqr->stopclk = get_clock(); | |
150 | } | |
151 | ||
152 | return cqr; | |
153 | ||
154 | } /* end default_erp_postaction */ | |
155 | ||
1da177e4 LT |
156 | void |
157 | dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) | |
158 | { | |
159 | struct dasd_device *device; | |
160 | ||
8e09f215 | 161 | device = cqr->startdev; |
1da177e4 LT |
162 | /* dump sense data */ |
163 | if (device->discipline && device->discipline->dump_sense) | |
164 | device->discipline->dump_sense(device, cqr, irb); | |
165 | } | |
166 | ||
fc19f381 SH |
167 | void |
168 | dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb) | |
169 | { | |
170 | struct dasd_device *device; | |
171 | ||
172 | device = cqr->startdev; | |
173 | /* dump sense data to s390 debugfeature*/ | |
174 | if (device->discipline && device->discipline->dump_sense_dbf) | |
aeec92ca | 175 | device->discipline->dump_sense_dbf(device, irb, "log"); |
fc19f381 SH |
176 | } |
177 | EXPORT_SYMBOL(dasd_log_sense_dbf); | |
178 | ||
1da177e4 LT |
179 | EXPORT_SYMBOL(dasd_default_erp_action); |
180 | EXPORT_SYMBOL(dasd_default_erp_postaction); | |
181 | EXPORT_SYMBOL(dasd_alloc_erp_request); | |
182 | EXPORT_SYMBOL(dasd_free_erp_request); | |
183 | EXPORT_SYMBOL(dasd_log_sense); | |
fc19f381 | 184 |