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
13 #include <linux/config.h>
14 #include <linux/ctype.h>
15 #include <linux/init.h>
17 #include <asm/debug.h>
18 #include <asm/ebcdic.h>
19 #include <asm/uaccess.h>
22 #define PRINTK_HEADER "dasd_erp:"
27 dasd_alloc_erp_request(char *magic, int cplength, int datasize,
28 struct dasd_device * device)
31 struct dasd_ccw_req *cqr;
36 if ( magic == NULL || datasize > PAGE_SIZE ||
37 (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
39 debug_text_event ( dasd_debug_area, 1, "ALLC");
40 debug_text_event ( dasd_debug_area, 1, magic);
41 debug_int_event ( dasd_debug_area, 1, cplength);
42 debug_int_event ( dasd_debug_area, 1, datasize);
44 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
46 size += cplength * sizeof(struct ccw1);
49 spin_lock_irqsave(&device->mem_lock, flags);
50 cqr = (struct dasd_ccw_req *)
51 dasd_alloc_chunk(&device->erp_chunks, size);
52 spin_unlock_irqrestore(&device->mem_lock, flags);
54 return ERR_PTR(-ENOMEM);
55 memset(cqr, 0, sizeof(struct dasd_ccw_req));
56 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
59 cqr->cpaddr = (struct ccw1 *) data;
60 data += cplength*sizeof(struct ccw1);
61 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
66 memset(cqr->data, 0, datasize);
68 strncpy((char *) &cqr->magic, magic, 4);
69 ASCEBC((char *) &cqr->magic, 4);
70 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
71 dasd_get_device(device);
76 dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
80 if (cqr->dstat != NULL)
82 debug_text_event(dasd_debug_area, 1, "FREE");
83 debug_int_event(dasd_debug_area, 1, (long) cqr);
84 spin_lock_irqsave(&device->mem_lock, flags);
85 dasd_free_chunk(&device->erp_chunks, cqr);
86 spin_unlock_irqrestore(&device->mem_lock, flags);
87 atomic_dec(&device->ref_count);
92 * dasd_default_erp_action just retries the current cqr
95 dasd_default_erp_action(struct dasd_ccw_req * cqr)
97 struct dasd_device *device;
101 /* just retry - there is nothing to save ... I got no sense data.... */
102 if (cqr->retries > 0) {
103 DEV_MESSAGE (KERN_DEBUG, device,
104 "default ERP called (%i retries left)",
106 cqr->status = DASD_CQR_QUEUED;
108 DEV_MESSAGE (KERN_WARNING, device, "%s",
109 "default ERP called (NO retry left)");
111 cqr->status = DASD_CQR_FAILED;
112 cqr->stopclk = get_clock ();
115 } /* end dasd_default_erp_action */
119 * Frees all ERPs of the current ERP Chain and set the status
120 * of the original CQR either to DASD_CQR_DONE if ERP was successful
121 * or to DASD_CQR_FAILED if ERP was NOT successful.
122 * NOTE: This function is only called if no discipline postaction
126 * erp current erp_head
129 * cqr pointer to the original CQR
131 struct dasd_ccw_req *
132 dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
134 struct dasd_device *device;
137 if (cqr->refers == NULL || cqr->function == NULL)
140 device = cqr->device;
141 success = cqr->status == DASD_CQR_DONE;
143 /* free all ERPs - but NOT the original cqr */
144 while (cqr->refers != NULL) {
145 struct dasd_ccw_req *refers;
147 refers = cqr->refers;
148 /* remove the request from the device queue */
149 list_del(&cqr->list);
150 /* free the finished erp request */
151 dasd_free_erp_request(cqr, device);
155 /* set corresponding status to original cqr */
157 cqr->status = DASD_CQR_DONE;
159 cqr->status = DASD_CQR_FAILED;
160 cqr->stopclk = get_clock();
165 } /* end default_erp_postaction */
168 * Print the hex dump of the memory used by a request. This includes
169 * all error recovery ccws that have been chained in from of the
173 hex_dump_memory(struct dasd_device *device, void *data, int len)
179 DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
180 pint, pint[0], pint[1], pint[2], pint[3]);
187 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
189 struct dasd_device *device;
191 device = cqr->device;
192 /* dump sense data */
193 if (device->discipline && device->discipline->dump_sense)
194 device->discipline->dump_sense(device, cqr, irb);
198 dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
200 struct dasd_device *device;
201 struct dasd_ccw_req *lcqr;
205 device = cqr->device;
206 /* log the channel program */
207 for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
208 DEV_MESSAGE(KERN_ERR, device,
209 "(%s) ERP chain report for req: %p",
210 caller == 0 ? "EXAMINE" : "ACTION", lcqr);
211 hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
215 while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
218 if (cplength > 40) { /* log only parts of the CP */
219 DEV_MESSAGE(KERN_ERR, device, "%s",
220 "Start of channel program:");
221 hex_dump_memory(device, lcqr->cpaddr,
222 40*sizeof(struct ccw1));
224 DEV_MESSAGE(KERN_ERR, device, "%s",
225 "End of channel program:");
226 hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
227 10*sizeof(struct ccw1));
228 } else { /* log the whole CP */
229 DEV_MESSAGE(KERN_ERR, device, "%s",
230 "Channel program (complete):");
231 hex_dump_memory(device, lcqr->cpaddr,
232 cplength*sizeof(struct ccw1));
239 * Log bytes arround failed CCW but only if we did
240 * not log the whole CP of the CCW is outside the
244 ((addr_t) cpa < (addr_t) lcqr->cpaddr &&
245 (addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
247 DEV_MESSAGE(KERN_ERR, device,
248 "Failed CCW (%p) (area):",
249 (void *) (long) cpa);
250 hex_dump_memory(device, cqr->cpaddr - 10,
251 20*sizeof(struct ccw1));
255 } /* end log_erp_chain */
257 EXPORT_SYMBOL(dasd_default_erp_action);
258 EXPORT_SYMBOL(dasd_default_erp_postaction);
259 EXPORT_SYMBOL(dasd_alloc_erp_request);
260 EXPORT_SYMBOL(dasd_free_erp_request);
261 EXPORT_SYMBOL(dasd_log_sense);
262 EXPORT_SYMBOL(dasd_log_ccw);