1/*
2 * File...........: linux/drivers/s390/block/dasd.c
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 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
9 *
10 */
11
12#include <linux/ctype.h>
13#include <linux/init.h>
14
15#include <asm/debug.h>
16#include <asm/ebcdic.h>
17#include <asm/uaccess.h>
18
19/* This is ugly... */
20#define PRINTK_HEADER "dasd_erp:"
21
22#include "dasd_int.h"
23
24struct dasd_ccw_req *
25dasd_alloc_erp_request(char *magic, int cplength, int datasize,
26		       struct dasd_device * device)
27{
28	unsigned long flags;
29	struct dasd_ccw_req *cqr;
30	char *data;
31	int size;
32
33	/* Sanity checks */
34	BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
35	     (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
36
37	size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
38	if (cplength > 0)
39		size += cplength * sizeof(struct ccw1);
40	if (datasize > 0)
41		size += datasize;
42	spin_lock_irqsave(&device->mem_lock, flags);
43	cqr = (struct dasd_ccw_req *)
44		dasd_alloc_chunk(&device->erp_chunks, size);
45	spin_unlock_irqrestore(&device->mem_lock, flags);
46	if (cqr == NULL)
47		return ERR_PTR(-ENOMEM);
48	memset(cqr, 0, sizeof(struct dasd_ccw_req));
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	strncpy((char *) &cqr->magic, magic, 4);
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
68void
69dasd_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 */
83struct dasd_ccw_req *
84dasd_default_erp_action(struct dasd_ccw_req * cqr)
85{
86	struct dasd_device *device;
87
88	device = cqr->device;
89
90        /* just retry - there is nothing to save ... I got no sense data.... */
91        if (cqr->retries > 0) {
92		DEV_MESSAGE (KERN_DEBUG, device,
93                             "default ERP called (%i retries left)",
94                             cqr->retries);
95		cqr->lpm    = LPM_ANYPATH;
96		cqr->status = DASD_CQR_QUEUED;
97        } else {
98                DEV_MESSAGE (KERN_WARNING, device, "%s",
99			     "default ERP called (NO retry left)");
100		cqr->status = DASD_CQR_FAILED;
101		cqr->stopclk = get_clock ();
102        }
103        return cqr;
104}				/* end dasd_default_erp_action */
105
106/*
107 * DESCRIPTION
108 *   Frees all ERPs of the current ERP Chain and set the status
109 *   of the original CQR either to DASD_CQR_DONE if ERP was successful
110 *   or to DASD_CQR_FAILED if ERP was NOT successful.
111 *   NOTE: This function is only called if no discipline postaction
112 *	   is available
113 *
114 * PARAMETER
115 *   erp		current erp_head
116 *
117 * RETURN VALUES
118 *   cqr		pointer to the original CQR
119 */
120struct dasd_ccw_req *
121dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
122{
123	struct dasd_device *device;
124	int success;
125
126	BUG_ON(cqr->refers == NULL || cqr->function == NULL);
127
128	device = cqr->device;
129	success = cqr->status == DASD_CQR_DONE;
130
131	/* free all ERPs - but NOT the original cqr */
132	while (cqr->refers != NULL) {
133		struct dasd_ccw_req *refers;
134
135		refers = cqr->refers;
136		/* remove the request from the device queue */
137		list_del(&cqr->list);
138		/* free the finished erp request */
139		dasd_free_erp_request(cqr, device);
140		cqr = refers;
141	}
142
143	/* set corresponding status to original cqr */
144	if (success)
145		cqr->status = DASD_CQR_DONE;
146	else {
147		cqr->status = DASD_CQR_FAILED;
148		cqr->stopclk = get_clock();
149	}
150
151	return cqr;
152
153}				/* end default_erp_postaction */
154
155void
156dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
157{
158	struct dasd_device *device;
159
160	device = cqr->device;
161	/* dump sense data */
162	if (device->discipline && device->discipline->dump_sense)
163		device->discipline->dump_sense(device, cqr, irb);
164}
165
166EXPORT_SYMBOL(dasd_default_erp_action);
167EXPORT_SYMBOL(dasd_default_erp_postaction);
168EXPORT_SYMBOL(dasd_alloc_erp_request);
169EXPORT_SYMBOL(dasd_free_erp_request);
170EXPORT_SYMBOL(dasd_log_sense);
171