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
12 #include <linux/ctype.h>
13 #include <linux/init.h>
15 #include <asm/debug.h>
16 #include <asm/ebcdic.h>
17 #include <asm/uaccess.h>
20 #define PRINTK_HEADER "dasd_erp:"
25 dasd_alloc_erp_request(char *magic, int cplength, int datasize,
26 struct dasd_device * device)
29 struct dasd_ccw_req *cqr;
34 BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
35 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
37 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
39 size += cplength * sizeof(struct ccw1);
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);
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);
52 cqr->cpaddr = (struct ccw1 *) data;
53 data += cplength*sizeof(struct ccw1);
54 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
59 memset(cqr->data, 0, datasize);
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);
69 dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
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);
81 * dasd_default_erp_action just retries the current cqr
84 dasd_default_erp_action(struct dasd_ccw_req * cqr)
86 struct dasd_device *device;
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)",
95 cqr->lpm = LPM_ANYPATH;
96 cqr->status = DASD_CQR_QUEUED;
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 ();
104 } /* end dasd_default_erp_action */
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
115 * erp current erp_head
118 * cqr pointer to the original CQR
120 struct dasd_ccw_req *
121 dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
123 struct dasd_device *device;
126 BUG_ON(cqr->refers == NULL || cqr->function == NULL);
128 device = cqr->device;
129 success = cqr->status == DASD_CQR_DONE;
131 /* free all ERPs - but NOT the original cqr */
132 while (cqr->refers != NULL) {
133 struct dasd_ccw_req *refers;
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);
143 /* set corresponding status to original cqr */
145 cqr->status = DASD_CQR_DONE;
147 cqr->status = DASD_CQR_FAILED;
148 cqr->stopclk = get_clock();
153 } /* end default_erp_postaction */
156 * Print the hex dump of the memory used by a request. This includes
157 * all error recovery ccws that have been chained in from of the
161 hex_dump_memory(struct dasd_device *device, void *data, int len)
167 DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
168 pint, pint[0], pint[1], pint[2], pint[3]);
175 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
177 struct dasd_device *device;
179 device = cqr->device;
180 /* dump sense data */
181 if (device->discipline && device->discipline->dump_sense)
182 device->discipline->dump_sense(device, cqr, irb);
185 EXPORT_SYMBOL(dasd_default_erp_action);
186 EXPORT_SYMBOL(dasd_default_erp_postaction);
187 EXPORT_SYMBOL(dasd_alloc_erp_request);
188 EXPORT_SYMBOL(dasd_free_erp_request);
189 EXPORT_SYMBOL(dasd_log_sense);