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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 | ||
1da177e4 LT |
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 */ | |
e048a8a6 ES |
34 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
35 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
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 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
50 | cqr->cpaddr = NULL; | |
51 | if (cplength > 0) { | |
52 | cqr->cpaddr = (struct ccw1 *) data; | |
53 | data += cplength*sizeof(struct ccw1); | |
54 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
55 | } | |
56 | cqr->data = NULL; | |
57 | if (datasize > 0) { | |
58 | cqr->data = data; | |
59 | memset(cqr->data, 0, datasize); | |
60 | } | |
61 | strncpy((char *) &cqr->magic, magic, 4); | |
62 | ASCEBC((char *) &cqr->magic, 4); | |
63 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
64 | dasd_get_device(device); | |
65 | return cqr; | |
66 | } | |
67 | ||
68 | void | |
69 | dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
70 | { | |
71 | unsigned long flags; | |
72 | ||
73 | spin_lock_irqsave(&device->mem_lock, flags); | |
74 | dasd_free_chunk(&device->erp_chunks, cqr); | |
75 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
76 | atomic_dec(&device->ref_count); | |
77 | } | |
78 | ||
79 | ||
80 | /* | |
81 | * dasd_default_erp_action just retries the current cqr | |
82 | */ | |
83 | struct dasd_ccw_req * | |
84 | dasd_default_erp_action(struct dasd_ccw_req * cqr) | |
85 | { | |
86 | struct dasd_device *device; | |
87 | ||
88 | device = cqr->device; | |
89 | ||
90 | /* just retry - there is nothing to save ... I got no sense data.... */ | |
91 | if (cqr->retries > 0) { | |
138c014d | 92 | DEV_MESSAGE (KERN_DEBUG, device, |
1da177e4 LT |
93 | "default ERP called (%i retries left)", |
94 | cqr->retries); | |
95 | cqr->lpm = LPM_ANYPATH; | |
96 | cqr->status = DASD_CQR_QUEUED; | |
97 | } else { | |
98 | DEV_MESSAGE (KERN_WARNING, device, "%s", | |
99 | "default ERP called (NO retry left)"); | |
100 | cqr->status = DASD_CQR_FAILED; | |
101 | cqr->stopclk = get_clock (); | |
102 | } | |
103 | return cqr; | |
104 | } /* end dasd_default_erp_action */ | |
105 | ||
106 | /* | |
107 | * DESCRIPTION | |
108 | * Frees all ERPs of the current ERP Chain and set the status | |
109 | * of the original CQR either to DASD_CQR_DONE if ERP was successful | |
110 | * or to DASD_CQR_FAILED if ERP was NOT successful. | |
111 | * NOTE: This function is only called if no discipline postaction | |
112 | * is available | |
113 | * | |
114 | * PARAMETER | |
115 | * erp current erp_head | |
116 | * | |
117 | * RETURN VALUES | |
118 | * cqr pointer to the original CQR | |
119 | */ | |
120 | struct dasd_ccw_req * | |
121 | dasd_default_erp_postaction(struct dasd_ccw_req * cqr) | |
122 | { | |
123 | struct dasd_device *device; | |
124 | int success; | |
125 | ||
e048a8a6 | 126 | BUG_ON(cqr->refers == NULL || cqr->function == NULL); |
1da177e4 LT |
127 | |
128 | device = cqr->device; | |
129 | success = cqr->status == DASD_CQR_DONE; | |
130 | ||
131 | /* free all ERPs - but NOT the original cqr */ | |
132 | while (cqr->refers != NULL) { | |
133 | struct dasd_ccw_req *refers; | |
134 | ||
135 | refers = cqr->refers; | |
136 | /* remove the request from the device queue */ | |
137 | list_del(&cqr->list); | |
138 | /* free the finished erp request */ | |
139 | dasd_free_erp_request(cqr, device); | |
140 | cqr = refers; | |
141 | } | |
142 | ||
143 | /* set corresponding status to original cqr */ | |
144 | if (success) | |
145 | cqr->status = DASD_CQR_DONE; | |
146 | else { | |
147 | cqr->status = DASD_CQR_FAILED; | |
148 | cqr->stopclk = get_clock(); | |
149 | } | |
150 | ||
151 | return cqr; | |
152 | ||
153 | } /* end default_erp_postaction */ | |
154 | ||
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155 | void |
156 | dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) | |
157 | { | |
158 | struct dasd_device *device; | |
159 | ||
160 | device = cqr->device; | |
161 | /* dump sense data */ | |
162 | if (device->discipline && device->discipline->dump_sense) | |
163 | device->discipline->dump_sense(device, cqr, irb); | |
164 | } | |
165 | ||
1da177e4 LT |
166 | EXPORT_SYMBOL(dasd_default_erp_action); |
167 | EXPORT_SYMBOL(dasd_default_erp_postaction); | |
168 | EXPORT_SYMBOL(dasd_alloc_erp_request); | |
169 | EXPORT_SYMBOL(dasd_free_erp_request); | |
170 | EXPORT_SYMBOL(dasd_log_sense); |