1 /* 2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 3 * Horst Hummel <Horst.Hummel@de.ibm.com> 4 * Carsten Otte <Cotte@de.ibm.com> 5 * Martin Schwidefsky <schwidefsky@de.ibm.com> 6 * Bugreports.to..: <Linux390@de.ibm.com> 7 * Copyright IBM Corp. 1999, 2001 8 * 9 */ 10 11 #define KMSG_COMPONENT "dasd" 12 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 INIT_LIST_HEAD(&cqr->devlist); 51 INIT_LIST_HEAD(&cqr->blocklist); 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 71 void 72 dasd_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 */ 86 struct dasd_ccw_req * 87 dasd_default_erp_action(struct dasd_ccw_req *cqr) 88 { 89 struct dasd_device *device; 90 91 device = cqr->startdev; 92 93 /* just retry - there is nothing to save ... I got no sense data.... */ 94 if (cqr->retries > 0) { 95 DBF_DEV_EVENT(DBF_DEBUG, device, 96 "default ERP called (%i retries left)", 97 cqr->retries); 98 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) 99 cqr->lpm = device->path_data.opm; 100 cqr->status = DASD_CQR_FILLED; 101 } else { 102 pr_err("%s: default ERP has run out of retries and failed\n", 103 dev_name(&device->cdev->dev)); 104 cqr->status = DASD_CQR_FAILED; 105 cqr->stopclk = get_clock(); 106 } 107 return cqr; 108 } /* end dasd_default_erp_action */ 109 110 /* 111 * DESCRIPTION 112 * Frees all ERPs of the current ERP Chain and set the status 113 * of the original CQR either to DASD_CQR_DONE if ERP was successful 114 * or to DASD_CQR_FAILED if ERP was NOT successful. 115 * NOTE: This function is only called if no discipline postaction 116 * is available 117 * 118 * PARAMETER 119 * erp current erp_head 120 * 121 * RETURN VALUES 122 * cqr pointer to the original CQR 123 */ 124 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr) 125 { 126 int success; 127 128 BUG_ON(cqr->refers == NULL || cqr->function == NULL); 129 130 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 block queue */ 138 list_del(&cqr->blocklist); 139 /* free the finished erp request */ 140 dasd_free_erp_request(cqr, cqr->memdev); 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 void 157 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) 158 { 159 struct dasd_device *device; 160 161 device = cqr->startdev; 162 /* dump sense data */ 163 if (device->discipline && device->discipline->dump_sense) 164 device->discipline->dump_sense(device, cqr, irb); 165 } 166 167 void 168 dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb) 169 { 170 struct dasd_device *device; 171 172 device = cqr->startdev; 173 /* dump sense data to s390 debugfeature*/ 174 if (device->discipline && device->discipline->dump_sense_dbf) 175 device->discipline->dump_sense_dbf(device, irb, "log"); 176 } 177 EXPORT_SYMBOL(dasd_log_sense_dbf); 178 179 EXPORT_SYMBOL(dasd_default_erp_action); 180 EXPORT_SYMBOL(dasd_default_erp_postaction); 181 EXPORT_SYMBOL(dasd_alloc_erp_request); 182 EXPORT_SYMBOL(dasd_free_erp_request); 183 EXPORT_SYMBOL(dasd_log_sense); 184 185