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 <linux/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 = dasd_path_get_opm(device); 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_tod_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 unsigned long long startclk, stopclk; 128 struct dasd_device *startdev; 129 130 BUG_ON(cqr->refers == NULL || cqr->function == NULL); 131 132 success = cqr->status == DASD_CQR_DONE; 133 startclk = cqr->startclk; 134 stopclk = cqr->stopclk; 135 startdev = cqr->startdev; 136 137 /* free all ERPs - but NOT the original cqr */ 138 while (cqr->refers != NULL) { 139 struct dasd_ccw_req *refers; 140 141 refers = cqr->refers; 142 /* remove the request from the block queue */ 143 list_del(&cqr->blocklist); 144 /* free the finished erp request */ 145 dasd_free_erp_request(cqr, cqr->memdev); 146 cqr = refers; 147 } 148 149 /* set corresponding status to original cqr */ 150 cqr->startclk = startclk; 151 cqr->stopclk = stopclk; 152 cqr->startdev = startdev; 153 if (success) 154 cqr->status = DASD_CQR_DONE; 155 else { 156 cqr->status = DASD_CQR_FAILED; 157 cqr->stopclk = get_tod_clock(); 158 } 159 160 return cqr; 161 162 } /* end default_erp_postaction */ 163 164 void 165 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) 166 { 167 struct dasd_device *device; 168 169 device = cqr->startdev; 170 if (cqr->intrc == -ETIMEDOUT) { 171 dev_err(&device->cdev->dev, 172 "A timeout error occurred for cqr %p\n", cqr); 173 return; 174 } 175 if (cqr->intrc == -ENOLINK) { 176 dev_err(&device->cdev->dev, 177 "A transport error occurred for cqr %p\n", cqr); 178 return; 179 } 180 /* dump sense data */ 181 if (device->discipline && device->discipline->dump_sense) 182 device->discipline->dump_sense(device, cqr, irb); 183 } 184 185 void 186 dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb) 187 { 188 struct dasd_device *device; 189 190 device = cqr->startdev; 191 /* dump sense data to s390 debugfeature*/ 192 if (device->discipline && device->discipline->dump_sense_dbf) 193 device->discipline->dump_sense_dbf(device, irb, "log"); 194 } 195 EXPORT_SYMBOL(dasd_log_sense_dbf); 196 197 EXPORT_SYMBOL(dasd_default_erp_action); 198 EXPORT_SYMBOL(dasd_default_erp_postaction); 199 EXPORT_SYMBOL(dasd_alloc_erp_request); 200 EXPORT_SYMBOL(dasd_free_erp_request); 201 EXPORT_SYMBOL(dasd_log_sense); 202 203