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/export.h> 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 #include "dasd_int.h" 21 22 struct dasd_ccw_req * 23 dasd_alloc_erp_request(unsigned int magic, int cplength, int datasize, 24 struct dasd_device * device) 25 { 26 unsigned long flags; 27 struct dasd_ccw_req *cqr; 28 char *data; 29 int size; 30 31 /* Sanity checks */ 32 BUG_ON(datasize > PAGE_SIZE || 33 (cplength*sizeof(struct ccw1)) > PAGE_SIZE); 34 35 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; 36 if (cplength > 0) 37 size += cplength * sizeof(struct ccw1); 38 if (datasize > 0) 39 size += datasize; 40 spin_lock_irqsave(&device->mem_lock, flags); 41 cqr = (struct dasd_ccw_req *) 42 dasd_alloc_chunk(&device->erp_chunks, size); 43 spin_unlock_irqrestore(&device->mem_lock, flags); 44 if (cqr == NULL) 45 return ERR_PTR(-ENOMEM); 46 memset(cqr, 0, sizeof(struct dasd_ccw_req)); 47 INIT_LIST_HEAD(&cqr->devlist); 48 INIT_LIST_HEAD(&cqr->blocklist); 49 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); 50 cqr->cpaddr = NULL; 51 if (cplength > 0) { 52 cqr->cpaddr = (struct ccw1 *) data; 53 data += cplength*sizeof(struct ccw1); 54 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); 55 } 56 cqr->data = NULL; 57 if (datasize > 0) { 58 cqr->data = data; 59 memset(cqr->data, 0, datasize); 60 } 61 cqr->magic = magic; 62 ASCEBC((char *) &cqr->magic, 4); 63 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 64 dasd_get_device(device); 65 return cqr; 66 } 67 68 void 69 dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device) 70 { 71 unsigned long flags; 72 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); 77 } 78 79 80 /* 81 * dasd_default_erp_action just retries the current cqr 82 */ 83 struct dasd_ccw_req * 84 dasd_default_erp_action(struct dasd_ccw_req *cqr) 85 { 86 struct dasd_device *device; 87 88 device = cqr->startdev; 89 90 /* just retry - there is nothing to save ... I got no sense data.... */ 91 if (cqr->retries > 0) { 92 DBF_DEV_EVENT(DBF_DEBUG, device, 93 "default ERP called (%i retries left)", 94 cqr->retries); 95 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) 96 cqr->lpm = dasd_path_get_opm(device); 97 cqr->status = DASD_CQR_FILLED; 98 } else { 99 pr_err("%s: default ERP has run out of retries and failed\n", 100 dev_name(&device->cdev->dev)); 101 cqr->status = DASD_CQR_FAILED; 102 cqr->stopclk = get_tod_clock(); 103 } 104 return cqr; 105 } /* end dasd_default_erp_action */ 106 107 /* 108 * DESCRIPTION 109 * Frees all ERPs of the current ERP Chain and set the status 110 * of the original CQR either to DASD_CQR_DONE if ERP was successful 111 * or to DASD_CQR_FAILED if ERP was NOT successful. 112 * NOTE: This function is only called if no discipline postaction 113 * is available 114 * 115 * PARAMETER 116 * erp current erp_head 117 * 118 * RETURN VALUES 119 * cqr pointer to the original CQR 120 */ 121 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr) 122 { 123 int success; 124 unsigned long startclk, stopclk; 125 struct dasd_device *startdev; 126 127 BUG_ON(cqr->refers == NULL || cqr->function == NULL); 128 129 success = cqr->status == DASD_CQR_DONE; 130 startclk = cqr->startclk; 131 stopclk = cqr->stopclk; 132 startdev = cqr->startdev; 133 134 /* free all ERPs - but NOT the original cqr */ 135 while (cqr->refers != NULL) { 136 struct dasd_ccw_req *refers; 137 138 refers = cqr->refers; 139 /* remove the request from the block queue */ 140 list_del(&cqr->blocklist); 141 /* free the finished erp request */ 142 dasd_free_erp_request(cqr, cqr->memdev); 143 cqr = refers; 144 } 145 146 /* set corresponding status to original cqr */ 147 cqr->startclk = startclk; 148 cqr->stopclk = stopclk; 149 cqr->startdev = startdev; 150 if (success) 151 cqr->status = DASD_CQR_DONE; 152 else { 153 cqr->status = DASD_CQR_FAILED; 154 cqr->stopclk = get_tod_clock(); 155 } 156 157 return cqr; 158 159 } /* end default_erp_postaction */ 160 161 void 162 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) 163 { 164 struct dasd_device *device; 165 166 device = cqr->startdev; 167 if (cqr->intrc == -ETIMEDOUT) { 168 dev_err(&device->cdev->dev, 169 "A timeout error occurred for cqr %px\n", cqr); 170 return; 171 } 172 if (cqr->intrc == -ENOLINK) { 173 dev_err(&device->cdev->dev, 174 "A transport error occurred for cqr %px\n", cqr); 175 return; 176 } 177 /* dump sense data */ 178 if (device->discipline && device->discipline->dump_sense) 179 device->discipline->dump_sense(device, cqr, irb); 180 } 181 182 void 183 dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb) 184 { 185 struct dasd_device *device; 186 187 device = cqr->startdev; 188 /* dump sense data to s390 debugfeature*/ 189 if (device->discipline && device->discipline->dump_sense_dbf) 190 device->discipline->dump_sense_dbf(device, irb, "log"); 191 } 192 EXPORT_SYMBOL(dasd_log_sense_dbf); 193 194 EXPORT_SYMBOL(dasd_default_erp_action); 195 EXPORT_SYMBOL(dasd_default_erp_postaction); 196 EXPORT_SYMBOL(dasd_alloc_erp_request); 197 EXPORT_SYMBOL(dasd_free_erp_request); 198 EXPORT_SYMBOL(dasd_log_sense); 199 200