1 // SPDX-License-Identifier: GPL-2.0 2 /* 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 * Copyright IBM Corp. 1999, 2001 9 * 10 */ 11 12 #include <linux/ctype.h> 13 #include <linux/init.h> 14 15 #include <asm/debug.h> 16 #include <asm/ebcdic.h> 17 #include <linux/uaccess.h> 18 19 #include "dasd_int.h" 20 21 struct dasd_ccw_req * 22 dasd_alloc_erp_request(unsigned int magic, int cplength, int datasize, 23 struct dasd_device * device) 24 { 25 unsigned long flags; 26 struct dasd_ccw_req *cqr; 27 char *data; 28 int size; 29 30 /* Sanity checks */ 31 BUG_ON(datasize > PAGE_SIZE || 32 (cplength*sizeof(struct ccw1)) > PAGE_SIZE); 33 34 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; 35 if (cplength > 0) 36 size += cplength * sizeof(struct ccw1); 37 if (datasize > 0) 38 size += datasize; 39 spin_lock_irqsave(&device->mem_lock, flags); 40 cqr = (struct dasd_ccw_req *) 41 dasd_alloc_chunk(&device->erp_chunks, size); 42 spin_unlock_irqrestore(&device->mem_lock, flags); 43 if (cqr == NULL) 44 return ERR_PTR(-ENOMEM); 45 memset(cqr, 0, sizeof(struct dasd_ccw_req)); 46 INIT_LIST_HEAD(&cqr->devlist); 47 INIT_LIST_HEAD(&cqr->blocklist); 48 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); 49 cqr->cpaddr = NULL; 50 if (cplength > 0) { 51 cqr->cpaddr = (struct ccw1 *) data; 52 data += cplength*sizeof(struct ccw1); 53 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); 54 } 55 cqr->data = NULL; 56 if (datasize > 0) { 57 cqr->data = data; 58 memset(cqr->data, 0, datasize); 59 } 60 cqr->magic = magic; 61 ASCEBC((char *) &cqr->magic, 4); 62 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 63 dasd_get_device(device); 64 return cqr; 65 } 66 67 void 68 dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device) 69 { 70 unsigned long flags; 71 72 spin_lock_irqsave(&device->mem_lock, flags); 73 dasd_free_chunk(&device->erp_chunks, cqr); 74 spin_unlock_irqrestore(&device->mem_lock, flags); 75 atomic_dec(&device->ref_count); 76 } 77 78 79 /* 80 * dasd_default_erp_action just retries the current cqr 81 */ 82 struct dasd_ccw_req * 83 dasd_default_erp_action(struct dasd_ccw_req *cqr) 84 { 85 struct dasd_device *device; 86 87 device = cqr->startdev; 88 89 /* just retry - there is nothing to save ... I got no sense data.... */ 90 if (cqr->retries > 0) { 91 DBF_DEV_EVENT(DBF_DEBUG, device, 92 "default ERP called (%i retries left)", 93 cqr->retries); 94 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) 95 cqr->lpm = dasd_path_get_opm(device); 96 cqr->status = DASD_CQR_FILLED; 97 } else { 98 pr_err("%s: default ERP has run out of retries and failed\n", 99 dev_name(&device->cdev->dev)); 100 cqr->status = DASD_CQR_FAILED; 101 cqr->stopclk = get_tod_clock(); 102 } 103 return cqr; 104 } /* end dasd_default_erp_action */ 105 106 /* 107 * DESCRIPTION 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 112 * is available 113 * 114 * PARAMETER 115 * erp current erp_head 116 * 117 * RETURN VALUES 118 * cqr pointer to the original CQR 119 */ 120 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr) 121 { 122 int success; 123 unsigned long startclk, stopclk; 124 struct dasd_device *startdev; 125 126 BUG_ON(cqr->refers == NULL || cqr->function == NULL); 127 128 success = cqr->status == DASD_CQR_DONE; 129 startclk = cqr->startclk; 130 stopclk = cqr->stopclk; 131 startdev = cqr->startdev; 132 133 /* free all ERPs - but NOT the original cqr */ 134 while (cqr->refers != NULL) { 135 struct dasd_ccw_req *refers; 136 137 refers = cqr->refers; 138 /* remove the request from the block queue */ 139 list_del(&cqr->blocklist); 140 /* free the finished erp request */ 141 dasd_free_erp_request(cqr, cqr->memdev); 142 cqr = refers; 143 } 144 145 /* set corresponding status to original cqr */ 146 cqr->startclk = startclk; 147 cqr->stopclk = stopclk; 148 cqr->startdev = startdev; 149 if (success) 150 cqr->status = DASD_CQR_DONE; 151 else { 152 cqr->status = DASD_CQR_FAILED; 153 cqr->stopclk = get_tod_clock(); 154 } 155 156 return cqr; 157 158 } /* end default_erp_postaction */ 159 160 void 161 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) 162 { 163 struct dasd_device *device; 164 165 device = cqr->startdev; 166 if (cqr->intrc == -ETIMEDOUT) { 167 dev_err(&device->cdev->dev, 168 "A timeout error occurred for cqr %px\n", cqr); 169 return; 170 } 171 if (cqr->intrc == -ENOLINK) { 172 dev_err(&device->cdev->dev, 173 "A transport error occurred for cqr %px\n", cqr); 174 return; 175 } 176 /* dump sense data */ 177 if (device->discipline && device->discipline->dump_sense) 178 device->discipline->dump_sense(device, cqr, irb); 179 } 180 181 void 182 dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb) 183 { 184 struct dasd_device *device; 185 186 device = cqr->startdev; 187 /* dump sense data to s390 debugfeature*/ 188 if (device->discipline && device->discipline->dump_sense_dbf) 189 device->discipline->dump_sense_dbf(device, irb, "log"); 190 } 191 EXPORT_SYMBOL(dasd_log_sense_dbf); 192 193 EXPORT_SYMBOL(dasd_default_erp_action); 194 EXPORT_SYMBOL(dasd_default_erp_postaction); 195 EXPORT_SYMBOL(dasd_alloc_erp_request); 196 EXPORT_SYMBOL(dasd_free_erp_request); 197 EXPORT_SYMBOL(dasd_log_sense); 198 199