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
26struct dasd_ccw_req *
27dasd_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 */
36	BUG_ON( magic == NULL || 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	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
72void
73dasd_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 */
87struct dasd_ccw_req *
88dasd_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 */
125struct 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
165void
166dasd_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
186void
187dasd_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}
196EXPORT_SYMBOL(dasd_log_sense_dbf);
197
198EXPORT_SYMBOL(dasd_default_erp_action);
199EXPORT_SYMBOL(dasd_default_erp_postaction);
200EXPORT_SYMBOL(dasd_alloc_erp_request);
201EXPORT_SYMBOL(dasd_free_erp_request);
202EXPORT_SYMBOL(dasd_log_sense);
203
204