blob: 7cb98d25f341683aaa987985acdbb34575800dfe [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 * $Revision: 1.14 $
11 */
12
13#include <linux/config.h>
14#include <linux/ctype.h>
15#include <linux/init.h>
16
17#include <asm/debug.h>
18#include <asm/ebcdic.h>
19#include <asm/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 if ( magic == NULL || datasize > PAGE_SIZE ||
37 (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
38 BUG();
39
40 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
41 if (cplength > 0)
42 size += cplength * sizeof(struct ccw1);
43 if (datasize > 0)
44 size += datasize;
45 spin_lock_irqsave(&device->mem_lock, flags);
46 cqr = (struct dasd_ccw_req *)
47 dasd_alloc_chunk(&device->erp_chunks, size);
48 spin_unlock_irqrestore(&device->mem_lock, flags);
49 if (cqr == NULL)
50 return ERR_PTR(-ENOMEM);
51 memset(cqr, 0, sizeof(struct dasd_ccw_req));
52 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
72dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
73{
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 *
87dasd_default_erp_action(struct dasd_ccw_req * cqr)
88{
89 struct dasd_device *device;
90
91 device = cqr->device;
92
93 /* just retry - there is nothing to save ... I got no sense data.... */
94 if (cqr->retries > 0) {
95 DEV_MESSAGE (KERN_DEBUG, device,
96 "default ERP called (%i retries left)",
97 cqr->retries);
98 cqr->lpm = LPM_ANYPATH;
99 cqr->status = DASD_CQR_QUEUED;
100 } else {
101 DEV_MESSAGE (KERN_WARNING, device, "%s",
102 "default ERP called (NO retry left)");
103 cqr->status = DASD_CQR_FAILED;
104 cqr->stopclk = get_clock ();
105 }
106 return cqr;
107} /* end dasd_default_erp_action */
108
109/*
110 * DESCRIPTION
111 * Frees all ERPs of the current ERP Chain and set the status
112 * of the original CQR either to DASD_CQR_DONE if ERP was successful
113 * or to DASD_CQR_FAILED if ERP was NOT successful.
114 * NOTE: This function is only called if no discipline postaction
115 * is available
116 *
117 * PARAMETER
118 * erp current erp_head
119 *
120 * RETURN VALUES
121 * cqr pointer to the original CQR
122 */
123struct dasd_ccw_req *
124dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
125{
126 struct dasd_device *device;
127 int success;
128
129 if (cqr->refers == NULL || cqr->function == NULL)
130 BUG();
131
132 device = cqr->device;
133 success = cqr->status == DASD_CQR_DONE;
134
135 /* free all ERPs - but NOT the original cqr */
136 while (cqr->refers != NULL) {
137 struct dasd_ccw_req *refers;
138
139 refers = cqr->refers;
140 /* remove the request from the device queue */
141 list_del(&cqr->list);
142 /* free the finished erp request */
143 dasd_free_erp_request(cqr, device);
144 cqr = refers;
145 }
146
147 /* set corresponding status to original cqr */
148 if (success)
149 cqr->status = DASD_CQR_DONE;
150 else {
151 cqr->status = DASD_CQR_FAILED;
152 cqr->stopclk = get_clock();
153 }
154
155 return cqr;
156
157} /* end default_erp_postaction */
158
159/*
160 * Print the hex dump of the memory used by a request. This includes
161 * all error recovery ccws that have been chained in from of the
162 * real request.
163 */
164static inline void
165hex_dump_memory(struct dasd_device *device, void *data, int len)
166{
167 int *pint;
168
169 pint = (int *) data;
170 while (len > 0) {
171 DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
172 pint, pint[0], pint[1], pint[2], pint[3]);
173 pint += 4;
174 len -= 16;
175 }
176}
177
178void
179dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
180{
181 struct dasd_device *device;
182
183 device = cqr->device;
184 /* dump sense data */
185 if (device->discipline && device->discipline->dump_sense)
186 device->discipline->dump_sense(device, cqr, irb);
187}
188
189void
190dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
191{
192 struct dasd_device *device;
193 struct dasd_ccw_req *lcqr;
194 struct ccw1 *ccw;
195 int cplength;
196
197 device = cqr->device;
198 /* log the channel program */
199 for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
200 DEV_MESSAGE(KERN_ERR, device,
201 "(%s) ERP chain report for req: %p",
202 caller == 0 ? "EXAMINE" : "ACTION", lcqr);
203 hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
204
205 cplength = 1;
206 ccw = lcqr->cpaddr;
207 while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
208 cplength++;
209
210 if (cplength > 40) { /* log only parts of the CP */
211 DEV_MESSAGE(KERN_ERR, device, "%s",
212 "Start of channel program:");
213 hex_dump_memory(device, lcqr->cpaddr,
214 40*sizeof(struct ccw1));
215
216 DEV_MESSAGE(KERN_ERR, device, "%s",
217 "End of channel program:");
218 hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
219 10*sizeof(struct ccw1));
220 } else { /* log the whole CP */
221 DEV_MESSAGE(KERN_ERR, device, "%s",
222 "Channel program (complete):");
223 hex_dump_memory(device, lcqr->cpaddr,
224 cplength*sizeof(struct ccw1));
225 }
226
227 if (lcqr != cqr)
228 continue;
229
230 /*
231 * Log bytes arround failed CCW but only if we did
232 * not log the whole CP of the CCW is outside the
233 * logged CP.
234 */
235 if (cplength > 40 ||
236 ((addr_t) cpa < (addr_t) lcqr->cpaddr &&
237 (addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
238
239 DEV_MESSAGE(KERN_ERR, device,
240 "Failed CCW (%p) (area):",
241 (void *) (long) cpa);
242 hex_dump_memory(device, cqr->cpaddr - 10,
243 20*sizeof(struct ccw1));
244 }
245 }
246
247} /* end log_erp_chain */
248
249EXPORT_SYMBOL(dasd_default_erp_action);
250EXPORT_SYMBOL(dasd_default_erp_postaction);
251EXPORT_SYMBOL(dasd_alloc_erp_request);
252EXPORT_SYMBOL(dasd_free_erp_request);
253EXPORT_SYMBOL(dasd_log_sense);
254EXPORT_SYMBOL(dasd_log_ccw);