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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
Heiko Carstensa53c8fa2012-07-20 11:15:04 +02007 * Copyright IBM Corp. 1999, 2001
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 */
10
Stefan Haberlandfc19f382009-03-26 15:23:49 +010011#define KMSG_COMPONENT "dasd"
12
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/ctype.h>
14#include <linux/init.h>
15
16#include <asm/debug.h>
17#include <asm/ebcdic.h>
18#include <asm/uaccess.h>
19
20/* This is ugly... */
21#define PRINTK_HEADER "dasd_erp:"
22
23#include "dasd_int.h"
24
25struct dasd_ccw_req *
26dasd_alloc_erp_request(char *magic, int cplength, int datasize,
27 struct dasd_device * device)
28{
29 unsigned long flags;
30 struct dasd_ccw_req *cqr;
31 char *data;
32 int size;
33
34 /* Sanity checks */
Eric Sesterhenne048a8a2006-04-01 01:27:08 +020035 BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
36 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
39 if (cplength > 0)
40 size += cplength * sizeof(struct ccw1);
41 if (datasize > 0)
42 size += datasize;
43 spin_lock_irqsave(&device->mem_lock, flags);
44 cqr = (struct dasd_ccw_req *)
45 dasd_alloc_chunk(&device->erp_chunks, size);
46 spin_unlock_irqrestore(&device->mem_lock, flags);
47 if (cqr == NULL)
48 return ERR_PTR(-ENOMEM);
49 memset(cqr, 0, sizeof(struct dasd_ccw_req));
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010050 INIT_LIST_HEAD(&cqr->devlist);
51 INIT_LIST_HEAD(&cqr->blocklist);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
53 cqr->cpaddr = NULL;
54 if (cplength > 0) {
55 cqr->cpaddr = (struct ccw1 *) data;
56 data += cplength*sizeof(struct ccw1);
57 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
58 }
59 cqr->data = NULL;
60 if (datasize > 0) {
61 cqr->data = data;
62 memset(cqr->data, 0, datasize);
63 }
64 strncpy((char *) &cqr->magic, magic, 4);
65 ASCEBC((char *) &cqr->magic, 4);
66 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
67 dasd_get_device(device);
68 return cqr;
69}
70
71void
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010072dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
74 unsigned long flags;
75
76 spin_lock_irqsave(&device->mem_lock, flags);
77 dasd_free_chunk(&device->erp_chunks, cqr);
78 spin_unlock_irqrestore(&device->mem_lock, flags);
79 atomic_dec(&device->ref_count);
80}
81
82
83/*
84 * dasd_default_erp_action just retries the current cqr
85 */
86struct dasd_ccw_req *
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010087dasd_default_erp_action(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
89 struct dasd_device *device;
90
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010091 device = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93 /* just retry - there is nothing to save ... I got no sense data.... */
94 if (cqr->retries > 0) {
Stefan Haberlandfc19f382009-03-26 15:23:49 +010095 DBF_DEV_EVENT(DBF_DEBUG, device,
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 "default ERP called (%i retries left)",
97 cqr->retries);
Stefan Weinhubera4d26c62011-01-05 12:48:03 +010098 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
99 cqr->lpm = device->path_data.opm;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100100 cqr->status = DASD_CQR_FILLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 } else {
Stefan Haberlandca99dab2009-09-11 10:28:30 +0200102 pr_err("%s: default ERP has run out of retries and failed\n",
103 dev_name(&device->cdev->dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 cqr->status = DASD_CQR_FAILED;
Heiko Carstens1aae0562013-01-30 09:49:40 +0100105 cqr->stopclk = get_tod_clock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 }
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 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100124struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 int success;
Stefan Weinhuberfbd70032013-08-27 13:52:17 +0200127 unsigned long long startclk, stopclk;
128 struct dasd_device *startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Eric Sesterhenne048a8a2006-04-01 01:27:08 +0200130 BUG_ON(cqr->refers == NULL || cqr->function == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 success = cqr->status == DASD_CQR_DONE;
Stefan Weinhuberfbd70032013-08-27 13:52:17 +0200133 startclk = cqr->startclk;
134 stopclk = cqr->stopclk;
135 startdev = cqr->startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
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;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100142 /* remove the request from the block queue */
143 list_del(&cqr->blocklist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 /* free the finished erp request */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100145 dasd_free_erp_request(cqr, cqr->memdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 cqr = refers;
147 }
148
149 /* set corresponding status to original cqr */
Stefan Weinhuberfbd70032013-08-27 13:52:17 +0200150 cqr->startclk = startclk;
151 cqr->stopclk = stopclk;
152 cqr->startdev = startdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 if (success)
154 cqr->status = DASD_CQR_DONE;
155 else {
156 cqr->status = DASD_CQR_FAILED;
Heiko Carstens1aae0562013-01-30 09:49:40 +0100157 cqr->stopclk = get_tod_clock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 }
159
160 return cqr;
161
162} /* end default_erp_postaction */
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164void
165dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
166{
167 struct dasd_device *device;
168
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100169 device = cqr->startdev;
Hannes Reineckef6f80342013-01-30 09:26:15 +0000170 if (cqr->intrc == -ETIMEDOUT) {
Stefan Weinhuber0ea46b02013-06-14 10:24:25 +0200171 dev_err(&device->cdev->dev,
172 "A timeout error occurred for cqr %p", cqr);
Hannes Reineckef6f80342013-01-30 09:26:15 +0000173 return;
174 }
175 if (cqr->intrc == -ENOLINK) {
Stefan Weinhuber0ea46b02013-06-14 10:24:25 +0200176 dev_err(&device->cdev->dev,
177 "A transport error occurred for cqr %p", cqr);
Hannes Reineckef6f80342013-01-30 09:26:15 +0000178 return;
179 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 /* dump sense data */
181 if (device->discipline && device->discipline->dump_sense)
182 device->discipline->dump_sense(device, cqr, irb);
183}
184
Stefan Haberlandfc19f382009-03-26 15:23:49 +0100185void
186dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb)
187{
188 struct dasd_device *device;
189
190 device = cqr->startdev;
191 /* dump sense data to s390 debugfeature*/
192 if (device->discipline && device->discipline->dump_sense_dbf)
Stefan Haberlandaeec92c2009-07-07 16:37:06 +0200193 device->discipline->dump_sense_dbf(device, irb, "log");
Stefan Haberlandfc19f382009-03-26 15:23:49 +0100194}
195EXPORT_SYMBOL(dasd_log_sense_dbf);
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197EXPORT_SYMBOL(dasd_default_erp_action);
198EXPORT_SYMBOL(dasd_default_erp_postaction);
199EXPORT_SYMBOL(dasd_alloc_erp_request);
200EXPORT_SYMBOL(dasd_free_erp_request);
201EXPORT_SYMBOL(dasd_log_sense);
Stefan Haberlandfc19f382009-03-26 15:23:49 +0100202