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