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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | // SPDX-License-Identifier: GPL-2.0 /* * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> * Horst Hummel <Horst.Hummel@de.ibm.com> * Carsten Otte <Cotte@de.ibm.com> * Martin Schwidefsky <schwidefsky@de.ibm.com> * Bugreports.to..: <Linux390@de.ibm.com> * Copyright IBM Corp. 1999, 2001 * */ #define KMSG_COMPONENT "dasd" #include <linux/ctype.h> #include <linux/init.h> #include <asm/debug.h> #include <asm/ebcdic.h> #include <linux/uaccess.h> /* This is ugly... */ #define PRINTK_HEADER "dasd_erp:" #include "dasd_int.h" struct dasd_ccw_req * dasd_alloc_erp_request(unsigned int magic, int cplength, int datasize, struct dasd_device * device) { unsigned long flags; struct dasd_ccw_req *cqr; char *data; int size; /* Sanity checks */ BUG_ON(datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE); size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; if (cplength > 0) size += cplength * sizeof(struct ccw1); if (datasize > 0) size += datasize; spin_lock_irqsave(&device->mem_lock, flags); cqr = (struct dasd_ccw_req *) dasd_alloc_chunk(&device->erp_chunks, size); spin_unlock_irqrestore(&device->mem_lock, flags); if (cqr == NULL) return ERR_PTR(-ENOMEM); memset(cqr, 0, sizeof(struct dasd_ccw_req)); INIT_LIST_HEAD(&cqr->devlist); INIT_LIST_HEAD(&cqr->blocklist); data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); cqr->cpaddr = NULL; if (cplength > 0) { cqr->cpaddr = (struct ccw1 *) data; data += cplength*sizeof(struct ccw1); memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); } cqr->data = NULL; if (datasize > 0) { cqr->data = data; memset(cqr->data, 0, datasize); } cqr->magic = magic; ASCEBC((char *) &cqr->magic, 4); set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); dasd_get_device(device); return cqr; } void dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device) { unsigned long flags; spin_lock_irqsave(&device->mem_lock, flags); dasd_free_chunk(&device->erp_chunks, cqr); spin_unlock_irqrestore(&device->mem_lock, flags); atomic_dec(&device->ref_count); } /* * dasd_default_erp_action just retries the current cqr */ struct dasd_ccw_req * dasd_default_erp_action(struct dasd_ccw_req *cqr) { struct dasd_device *device; device = cqr->startdev; /* just retry - there is nothing to save ... I got no sense data.... */ if (cqr->retries > 0) { DBF_DEV_EVENT(DBF_DEBUG, device, "default ERP called (%i retries left)", cqr->retries); if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) cqr->lpm = dasd_path_get_opm(device); cqr->status = DASD_CQR_FILLED; } else { pr_err("%s: default ERP has run out of retries and failed\n", dev_name(&device->cdev->dev)); cqr->status = DASD_CQR_FAILED; cqr->stopclk = get_tod_clock(); } return cqr; } /* end dasd_default_erp_action */ /* * DESCRIPTION * Frees all ERPs of the current ERP Chain and set the status * of the original CQR either to DASD_CQR_DONE if ERP was successful * or to DASD_CQR_FAILED if ERP was NOT successful. * NOTE: This function is only called if no discipline postaction * is available * * PARAMETER * erp current erp_head * * RETURN VALUES * cqr pointer to the original CQR */ struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr) { int success; unsigned long startclk, stopclk; struct dasd_device *startdev; BUG_ON(cqr->refers == NULL || cqr->function == NULL); success = cqr->status == DASD_CQR_DONE; startclk = cqr->startclk; stopclk = cqr->stopclk; startdev = cqr->startdev; /* free all ERPs - but NOT the original cqr */ while (cqr->refers != NULL) { struct dasd_ccw_req *refers; refers = cqr->refers; /* remove the request from the block queue */ list_del(&cqr->blocklist); /* free the finished erp request */ dasd_free_erp_request(cqr, cqr->memdev); cqr = refers; } /* set corresponding status to original cqr */ cqr->startclk = startclk; cqr->stopclk = stopclk; cqr->startdev = startdev; if (success) cqr->status = DASD_CQR_DONE; else { cqr->status = DASD_CQR_FAILED; cqr->stopclk = get_tod_clock(); } return cqr; } /* end default_erp_postaction */ void dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) { struct dasd_device *device; device = cqr->startdev; if (cqr->intrc == -ETIMEDOUT) { dev_err(&device->cdev->dev, "A timeout error occurred for cqr %p\n", cqr); return; } if (cqr->intrc == -ENOLINK) { dev_err(&device->cdev->dev, "A transport error occurred for cqr %p\n", cqr); return; } /* dump sense data */ if (device->discipline && device->discipline->dump_sense) device->discipline->dump_sense(device, cqr, irb); } void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb) { struct dasd_device *device; device = cqr->startdev; /* dump sense data to s390 debugfeature*/ if (device->discipline && device->discipline->dump_sense_dbf) device->discipline->dump_sense_dbf(device, irb, "log"); } EXPORT_SYMBOL(dasd_log_sense_dbf); EXPORT_SYMBOL(dasd_default_erp_action); EXPORT_SYMBOL(dasd_default_erp_postaction); EXPORT_SYMBOL(dasd_alloc_erp_request); EXPORT_SYMBOL(dasd_free_erp_request); EXPORT_SYMBOL(dasd_log_sense); |