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 #include <linux/export.h>
13 #include <linux/ctype.h>
14 #include <linux/init.h>
15
16 #include <asm/debug.h>
17 #include <asm/ebcdic.h>
18 #include <linux/uaccess.h>
19
20 #include "dasd_int.h"
21
22 struct dasd_ccw_req *
dasd_alloc_erp_request(unsigned int magic,int cplength,int datasize,struct dasd_device * device)23 dasd_alloc_erp_request(unsigned int magic, int cplength, int datasize,
24 struct dasd_device * device)
25 {
26 unsigned long flags;
27 struct dasd_ccw_req *cqr;
28 char *data;
29 int size;
30
31 /* Sanity checks */
32 BUG_ON(datasize > PAGE_SIZE ||
33 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
34
35 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
36 if (cplength > 0)
37 size += cplength * sizeof(struct ccw1);
38 if (datasize > 0)
39 size += datasize;
40 spin_lock_irqsave(&device->mem_lock, flags);
41 cqr = (struct dasd_ccw_req *)
42 dasd_alloc_chunk(&device->erp_chunks, size);
43 spin_unlock_irqrestore(&device->mem_lock, flags);
44 if (cqr == NULL)
45 return ERR_PTR(-ENOMEM);
46 memset(cqr, 0, sizeof(struct dasd_ccw_req));
47 INIT_LIST_HEAD(&cqr->devlist);
48 INIT_LIST_HEAD(&cqr->blocklist);
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 cqr->magic = magic;
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
dasd_free_erp_request(struct dasd_ccw_req * cqr,struct dasd_device * device)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 *
dasd_default_erp_action(struct dasd_ccw_req * cqr)84 dasd_default_erp_action(struct dasd_ccw_req *cqr)
85 {
86 struct dasd_device *device;
87
88 device = cqr->startdev;
89
90 /* just retry - there is nothing to save ... I got no sense data.... */
91 if (cqr->retries > 0) {
92 DBF_DEV_EVENT(DBF_DEBUG, device,
93 "default ERP called (%i retries left)",
94 cqr->retries);
95 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
96 cqr->lpm = dasd_path_get_opm(device);
97 cqr->status = DASD_CQR_FILLED;
98 } else {
99 pr_err("%s: default ERP has run out of retries and failed\n",
100 dev_name(&device->cdev->dev));
101 cqr->status = DASD_CQR_FAILED;
102 cqr->stopclk = get_tod_clock();
103 }
104 return cqr;
105 } /* end dasd_default_erp_action */
106
107 /*
108 * DESCRIPTION
109 * Frees all ERPs of the current ERP Chain and set the status
110 * of the original CQR either to DASD_CQR_DONE if ERP was successful
111 * or to DASD_CQR_FAILED if ERP was NOT successful.
112 * NOTE: This function is only called if no discipline postaction
113 * is available
114 *
115 * PARAMETER
116 * erp current erp_head
117 *
118 * RETURN VALUES
119 * cqr pointer to the original CQR
120 */
dasd_default_erp_postaction(struct dasd_ccw_req * cqr)121 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr)
122 {
123 int success, aborted;
124 unsigned long startclk, stopclk;
125 struct dasd_device *startdev;
126 unsigned int proc_bytes;
127
128 BUG_ON(cqr->refers == NULL || cqr->function == NULL);
129
130 success = cqr->status == DASD_CQR_DONE;
131 aborted = cqr->status == DASD_CQR_ABORTED;
132 startclk = cqr->startclk;
133 stopclk = cqr->stopclk;
134 startdev = cqr->startdev;
135 proc_bytes = cqr->proc_bytes;
136
137 /* free all ERPs - but NOT the original cqr */
138 while (cqr->refers != NULL) {
139 struct dasd_ccw_req *refers;
140
141 refers = cqr->refers;
142 /* remove the request from the block queue */
143 list_del(&cqr->blocklist);
144 /* free the finished erp request */
145 dasd_free_erp_request(cqr, cqr->memdev);
146 cqr = refers;
147 }
148
149 /* set corresponding status to original cqr */
150 cqr->startclk = startclk;
151 cqr->stopclk = stopclk;
152 cqr->startdev = startdev;
153 cqr->proc_bytes = proc_bytes;
154 if (aborted)
155 /* base request is owned by the ESE format replacement CQR */
156 cqr->status = DASD_CQR_ABORTED;
157 else if (success)
158 cqr->status = DASD_CQR_DONE;
159 else {
160 cqr->status = DASD_CQR_FAILED;
161 cqr->stopclk = get_tod_clock();
162 }
163
164 return cqr;
165
166 } /* end default_erp_postaction */
167
168 void
dasd_log_sense(struct dasd_ccw_req * cqr,struct irb * irb)169 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
170 {
171 struct dasd_device *device;
172
173 device = cqr->startdev;
174 if (cqr->intrc == -ETIMEDOUT) {
175 dev_err(&device->cdev->dev,
176 "A timeout error occurred for cqr %px\n", cqr);
177 return;
178 }
179 if (cqr->intrc == -ENOLINK) {
180 dev_err(&device->cdev->dev,
181 "A transport error occurred for cqr %px\n", cqr);
182 return;
183 }
184 /* dump sense data */
185 if (device->discipline && device->discipline->dump_sense)
186 device->discipline->dump_sense(device, cqr, irb);
187 }
188
189 void
dasd_log_sense_dbf(struct dasd_ccw_req * cqr,struct irb * irb)190 dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb)
191 {
192 struct dasd_device *device;
193
194 device = cqr->startdev;
195 /* dump sense data to s390 debugfeature*/
196 if (device->discipline && device->discipline->dump_sense_dbf)
197 device->discipline->dump_sense_dbf(device, irb, "log");
198 }
199 EXPORT_SYMBOL(dasd_log_sense_dbf);
200
201 EXPORT_SYMBOL(dasd_default_erp_action);
202 EXPORT_SYMBOL(dasd_default_erp_postaction);
203 EXPORT_SYMBOL(dasd_alloc_erp_request);
204 EXPORT_SYMBOL(dasd_free_erp_request);
205 EXPORT_SYMBOL(dasd_log_sense);
206
207