Pull trivial1 into release branch
[linux-2.6] / drivers / s390 / block / dasd_erp.c
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/config.h>
13 #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
25 struct dasd_ccw_req *
26 dasd_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 */
35         BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
36              (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
37
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));
50         data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
51         cqr->cpaddr = NULL;
52         if (cplength > 0) {
53                 cqr->cpaddr = (struct ccw1 *) data;
54                 data += cplength*sizeof(struct ccw1);
55                 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
56         }
57         cqr->data = NULL;
58         if (datasize > 0) {
59                 cqr->data = data;
60                 memset(cqr->data, 0, datasize);
61         }
62         strncpy((char *) &cqr->magic, magic, 4);
63         ASCEBC((char *) &cqr->magic, 4);
64         set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
65         dasd_get_device(device);
66         return cqr;
67 }
68
69 void
70 dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
71 {
72         unsigned long flags;
73
74         spin_lock_irqsave(&device->mem_lock, flags);
75         dasd_free_chunk(&device->erp_chunks, cqr);
76         spin_unlock_irqrestore(&device->mem_lock, flags);
77         atomic_dec(&device->ref_count);
78 }
79
80
81 /*
82  * dasd_default_erp_action just retries the current cqr
83  */
84 struct dasd_ccw_req *
85 dasd_default_erp_action(struct dasd_ccw_req * cqr)
86 {
87         struct dasd_device *device;
88
89         device = cqr->device;
90
91         /* just retry - there is nothing to save ... I got no sense data.... */
92         if (cqr->retries > 0) {
93                 DEV_MESSAGE (KERN_DEBUG, device, 
94                              "default ERP called (%i retries left)",
95                              cqr->retries);
96                 cqr->lpm    = LPM_ANYPATH;
97                 cqr->status = DASD_CQR_QUEUED;
98         } else {
99                 DEV_MESSAGE (KERN_WARNING, device, "%s",
100                              "default ERP called (NO retry left)");
101                 cqr->status = DASD_CQR_FAILED;
102                 cqr->stopclk = get_clock ();
103         }
104         return cqr;
105 }                               /* end dasd_default_erp_action */
106
107 /*
108  * DESCRIPTION
109  *   Frees all ERPs of the current ERP Chain and set the status
110  *   of the original CQR either to DASD_CQR_DONE if ERP was successful
111  *   or to DASD_CQR_FAILED if ERP was NOT successful.
112  *   NOTE: This function is only called if no discipline postaction
113  *         is available
114  *
115  * PARAMETER
116  *   erp                current erp_head
117  *
118  * RETURN VALUES
119  *   cqr                pointer to the original CQR
120  */
121 struct dasd_ccw_req *
122 dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
123 {
124         struct dasd_device *device;
125         int success;
126
127         BUG_ON(cqr->refers == NULL || cqr->function == NULL);
128
129         device = cqr->device;
130         success = cqr->status == DASD_CQR_DONE;
131
132         /* free all ERPs - but NOT the original cqr */
133         while (cqr->refers != NULL) {
134                 struct dasd_ccw_req *refers;
135
136                 refers = cqr->refers;
137                 /* remove the request from the device queue */
138                 list_del(&cqr->list);
139                 /* free the finished erp request */
140                 dasd_free_erp_request(cqr, device);
141                 cqr = refers;
142         }
143
144         /* set corresponding status to original cqr */
145         if (success)
146                 cqr->status = DASD_CQR_DONE;
147         else {
148                 cqr->status = DASD_CQR_FAILED;
149                 cqr->stopclk = get_clock();
150         }
151
152         return cqr;
153
154 }                               /* end default_erp_postaction */
155
156 /*
157  * Print the hex dump of the memory used by a request. This includes
158  * all error recovery ccws that have been chained in from of the 
159  * real request.
160  */
161 static inline void
162 hex_dump_memory(struct dasd_device *device, void *data, int len)
163 {
164         int *pint;
165
166         pint = (int *) data;
167         while (len > 0) {
168                 DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
169                             pint, pint[0], pint[1], pint[2], pint[3]);
170                 pint += 4;
171                 len -= 16;
172         }
173 }
174
175 void
176 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
177 {
178         struct dasd_device *device;
179
180         device = cqr->device;
181         /* dump sense data */
182         if (device->discipline && device->discipline->dump_sense)
183                 device->discipline->dump_sense(device, cqr, irb);
184 }
185
186 void
187 dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
188 {
189         struct dasd_device *device;
190         struct dasd_ccw_req *lcqr;
191         struct ccw1 *ccw;
192         int cplength;
193
194         device = cqr->device;
195         /* log the channel program */
196         for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
197                 DEV_MESSAGE(KERN_ERR, device,
198                             "(%s) ERP chain report for req: %p",
199                             caller == 0 ? "EXAMINE" : "ACTION", lcqr);
200                 hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
201
202                 cplength = 1;
203                 ccw = lcqr->cpaddr;
204                 while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
205                         cplength++;
206
207                 if (cplength > 40) {    /* log only parts of the CP */
208                         DEV_MESSAGE(KERN_ERR, device, "%s",
209                                     "Start of channel program:");
210                         hex_dump_memory(device, lcqr->cpaddr,
211                                         40*sizeof(struct ccw1));
212
213                         DEV_MESSAGE(KERN_ERR, device, "%s",
214                                     "End of channel program:");
215                         hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
216                                         10*sizeof(struct ccw1));
217                 } else {        /* log the whole CP */
218                         DEV_MESSAGE(KERN_ERR, device, "%s",
219                                     "Channel program (complete):");
220                         hex_dump_memory(device, lcqr->cpaddr,
221                                         cplength*sizeof(struct ccw1));
222                 }
223
224                 if (lcqr != cqr)
225                         continue;
226
227                 /*
228                  * Log bytes arround failed CCW but only if we did
229                  * not log the whole CP of the CCW is outside the
230                  * logged CP. 
231                  */
232                 if (cplength > 40 ||
233                     ((addr_t) cpa < (addr_t) lcqr->cpaddr &&
234                      (addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
235                         
236                         DEV_MESSAGE(KERN_ERR, device,
237                                     "Failed CCW (%p) (area):",
238                                     (void *) (long) cpa);
239                         hex_dump_memory(device, cqr->cpaddr - 10,
240                                         20*sizeof(struct ccw1));
241                 }
242         }
243
244 }                               /* end log_erp_chain */
245
246 EXPORT_SYMBOL(dasd_default_erp_action);
247 EXPORT_SYMBOL(dasd_default_erp_postaction);
248 EXPORT_SYMBOL(dasd_alloc_erp_request);
249 EXPORT_SYMBOL(dasd_free_erp_request);
250 EXPORT_SYMBOL(dasd_log_sense);
251 EXPORT_SYMBOL(dasd_log_ccw);