1/* 2 * File...........: linux/drivers/s390/block/dasd.c 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 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 9 * 10 */ 11 12#define KMSG_COMPONENT "dasd" 13 14#include <linux/ctype.h> 15#include <linux/init.h> 16 17#include <asm/debug.h> 18#include <asm/ebcdic.h> 19#include <asm/uaccess.h> 20 21/* This is ugly... */ 22#define PRINTK_HEADER "dasd_erp:" 23 24#include "dasd_int.h" 25 26struct dasd_ccw_req * 27dasd_alloc_erp_request(char *magic, int cplength, int datasize, 28 struct dasd_device * device) 29{ 30 unsigned long flags; 31 struct dasd_ccw_req *cqr; 32 char *data; 33 int size; 34 35 /* Sanity checks */ 36 BUG_ON( magic == NULL || datasize > PAGE_SIZE || 37 (cplength*sizeof(struct ccw1)) > PAGE_SIZE); 38 39 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; 40 if (cplength > 0) 41 size += cplength * sizeof(struct ccw1); 42 if (datasize > 0) 43 size += datasize; 44 spin_lock_irqsave(&device->mem_lock, flags); 45 cqr = (struct dasd_ccw_req *) 46 dasd_alloc_chunk(&device->erp_chunks, size); 47 spin_unlock_irqrestore(&device->mem_lock, flags); 48 if (cqr == NULL) 49 return ERR_PTR(-ENOMEM); 50 memset(cqr, 0, sizeof(struct dasd_ccw_req)); 51 INIT_LIST_HEAD(&cqr->devlist); 52 INIT_LIST_HEAD(&cqr->blocklist); 53 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); 54 cqr->cpaddr = NULL; 55 if (cplength > 0) { 56 cqr->cpaddr = (struct ccw1 *) data; 57 data += cplength*sizeof(struct ccw1); 58 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); 59 } 60 cqr->data = NULL; 61 if (datasize > 0) { 62 cqr->data = data; 63 memset(cqr->data, 0, datasize); 64 } 65 strncpy((char *) &cqr->magic, magic, 4); 66 ASCEBC((char *) &cqr->magic, 4); 67 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 68 dasd_get_device(device); 69 return cqr; 70} 71 72void 73dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device) 74{ 75 unsigned long flags; 76 77 spin_lock_irqsave(&device->mem_lock, flags); 78 dasd_free_chunk(&device->erp_chunks, cqr); 79 spin_unlock_irqrestore(&device->mem_lock, flags); 80 atomic_dec(&device->ref_count); 81} 82 83 84/* 85 * dasd_default_erp_action just retries the current cqr 86 */ 87struct dasd_ccw_req * 88dasd_default_erp_action(struct dasd_ccw_req *cqr) 89{ 90 struct dasd_device *device; 91 92 device = cqr->startdev; 93 94 /* just retry - there is nothing to save ... I got no sense data.... */ 95 if (cqr->retries > 0) { 96 DBF_DEV_EVENT(DBF_DEBUG, device, 97 "default ERP called (%i retries left)", 98 cqr->retries); 99 cqr->lpm = LPM_ANYPATH; 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 */ 124struct 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 156void 157dasd_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 167void 168dasd_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} 177EXPORT_SYMBOL(dasd_log_sense_dbf); 178 179EXPORT_SYMBOL(dasd_default_erp_action); 180EXPORT_SYMBOL(dasd_default_erp_postaction); 181EXPORT_SYMBOL(dasd_alloc_erp_request); 182EXPORT_SYMBOL(dasd_free_erp_request); 183EXPORT_SYMBOL(dasd_log_sense); 184