1 // SPDX-License-Identifier: GPL-2.0
2 /*
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 * Copyright IBM Corp. 1999, 2001
9 *
10 */
11
12 #define KMSG_COMPONENT "dasd"
13
14 #include <linux/ctype.h>
15 #include <linux/init.h>
16
17 #include <asm/debug.h>
18 #include <asm/ebcdic.h>
19 #include <linux/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 *
dasd_alloc_erp_request(unsigned int magic,int cplength,int datasize,struct dasd_device * device)27 dasd_alloc_erp_request(unsigned int 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 */
36 BUG_ON(datasize > PAGE_SIZE ||
37 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
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));
51 INIT_LIST_HEAD(&cqr->devlist);
52 INIT_LIST_HEAD(&cqr->blocklist);
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 cqr->magic = magic;
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
dasd_free_erp_request(struct dasd_ccw_req * cqr,struct dasd_device * device)73 dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device)
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 *
dasd_default_erp_action(struct dasd_ccw_req * cqr)88 dasd_default_erp_action(struct dasd_ccw_req *cqr)
89 {
90 struct dasd_device *device;
91
92 device = cqr->startdev;
93
94 /* just retry - there is nothing to save ... I got no sense data.... */
95 if (cqr->retries > 0) {
96 DBF_DEV_EVENT(DBF_DEBUG, device,
97 "default ERP called (%i retries left)",
98 cqr->retries);
99 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
100 cqr->lpm = dasd_path_get_opm(device);
101 cqr->status = DASD_CQR_FILLED;
102 } else {
103 pr_err("%s: default ERP has run out of retries and failed\n",
104 dev_name(&device->cdev->dev));
105 cqr->status = DASD_CQR_FAILED;
106 cqr->stopclk = get_tod_clock();
107 }
108 return cqr;
109 } /* end dasd_default_erp_action */
110
111 /*
112 * DESCRIPTION
113 * Frees all ERPs of the current ERP Chain and set the status
114 * of the original CQR either to DASD_CQR_DONE if ERP was successful
115 * or to DASD_CQR_FAILED if ERP was NOT successful.
116 * NOTE: This function is only called if no discipline postaction
117 * is available
118 *
119 * PARAMETER
120 * erp current erp_head
121 *
122 * RETURN VALUES
123 * cqr pointer to the original CQR
124 */
dasd_default_erp_postaction(struct dasd_ccw_req * cqr)125 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr)
126 {
127 int success;
128 unsigned long startclk, stopclk;
129 struct dasd_device *startdev;
130
131 BUG_ON(cqr->refers == NULL || cqr->function == NULL);
132
133 success = cqr->status == DASD_CQR_DONE;
134 startclk = cqr->startclk;
135 stopclk = cqr->stopclk;
136 startdev = cqr->startdev;
137
138 /* free all ERPs - but NOT the original cqr */
139 while (cqr->refers != NULL) {
140 struct dasd_ccw_req *refers;
141
142 refers = cqr->refers;
143 /* remove the request from the block queue */
144 list_del(&cqr->blocklist);
145 /* free the finished erp request */
146 dasd_free_erp_request(cqr, cqr->memdev);
147 cqr = refers;
148 }
149
150 /* set corresponding status to original cqr */
151 cqr->startclk = startclk;
152 cqr->stopclk = stopclk;
153 cqr->startdev = startdev;
154 if (success)
155 cqr->status = DASD_CQR_DONE;
156 else {
157 cqr->status = DASD_CQR_FAILED;
158 cqr->stopclk = get_tod_clock();
159 }
160
161 return cqr;
162
163 } /* end default_erp_postaction */
164
165 void
dasd_log_sense(struct dasd_ccw_req * cqr,struct irb * irb)166 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
167 {
168 struct dasd_device *device;
169
170 device = cqr->startdev;
171 if (cqr->intrc == -ETIMEDOUT) {
172 dev_err(&device->cdev->dev,
173 "A timeout error occurred for cqr %p\n", cqr);
174 return;
175 }
176 if (cqr->intrc == -ENOLINK) {
177 dev_err(&device->cdev->dev,
178 "A transport error occurred for cqr %p\n", cqr);
179 return;
180 }
181 /* dump sense data */
182 if (device->discipline && device->discipline->dump_sense)
183 device->discipline->dump_sense(device, cqr, irb);
184 }
185
186 void
dasd_log_sense_dbf(struct dasd_ccw_req * cqr,struct irb * irb)187 dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb)
188 {
189 struct dasd_device *device;
190
191 device = cqr->startdev;
192 /* dump sense data to s390 debugfeature*/
193 if (device->discipline && device->discipline->dump_sense_dbf)
194 device->discipline->dump_sense_dbf(device, irb, "log");
195 }
196 EXPORT_SYMBOL(dasd_log_sense_dbf);
197
198 EXPORT_SYMBOL(dasd_default_erp_action);
199 EXPORT_SYMBOL(dasd_default_erp_postaction);
200 EXPORT_SYMBOL(dasd_alloc_erp_request);
201 EXPORT_SYMBOL(dasd_free_erp_request);
202 EXPORT_SYMBOL(dasd_log_sense);
203
204