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 #include <linux/ctype.h> 13 #include <linux/init.h> 14 15 #include <asm/debug.h> 16 #include <asm/ebcdic.h> 17 #include <asm/uaccess.h> 18 19 /* This is ugly... */ 20 #define PRINTK_HEADER "dasd_erp:" 21 22 #include "dasd_int.h" 23 24 struct dasd_ccw_req * 25 dasd_alloc_erp_request(char *magic, int cplength, int datasize, 26 struct dasd_device * device) 27 { 28 unsigned long flags; 29 struct dasd_ccw_req *cqr; 30 char *data; 31 int size; 32 33 /* Sanity checks */ 34 BUG_ON( magic == NULL || datasize > PAGE_SIZE || 35 (cplength*sizeof(struct ccw1)) > PAGE_SIZE); 36 37 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; 38 if (cplength > 0) 39 size += cplength * sizeof(struct ccw1); 40 if (datasize > 0) 41 size += datasize; 42 spin_lock_irqsave(&device->mem_lock, flags); 43 cqr = (struct dasd_ccw_req *) 44 dasd_alloc_chunk(&device->erp_chunks, size); 45 spin_unlock_irqrestore(&device->mem_lock, flags); 46 if (cqr == NULL) 47 return ERR_PTR(-ENOMEM); 48 memset(cqr, 0, sizeof(struct dasd_ccw_req)); 49 INIT_LIST_HEAD(&cqr->devlist); 50 INIT_LIST_HEAD(&cqr->blocklist); 51 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); 52 cqr->cpaddr = NULL; 53 if (cplength > 0) { 54 cqr->cpaddr = (struct ccw1 *) data; 55 data += cplength*sizeof(struct ccw1); 56 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); 57 } 58 cqr->data = NULL; 59 if (datasize > 0) { 60 cqr->data = data; 61 memset(cqr->data, 0, datasize); 62 } 63 strncpy((char *) &cqr->magic, magic, 4); 64 ASCEBC((char *) &cqr->magic, 4); 65 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 66 dasd_get_device(device); 67 return cqr; 68 } 69 70 void 71 dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device) 72 { 73 unsigned long flags; 74 75 spin_lock_irqsave(&device->mem_lock, flags); 76 dasd_free_chunk(&device->erp_chunks, cqr); 77 spin_unlock_irqrestore(&device->mem_lock, flags); 78 atomic_dec(&device->ref_count); 79 } 80 81 82 /* 83 * dasd_default_erp_action just retries the current cqr 84 */ 85 struct dasd_ccw_req * 86 dasd_default_erp_action(struct dasd_ccw_req *cqr) 87 { 88 struct dasd_device *device; 89 90 device = cqr->startdev; 91 92 /* just retry - there is nothing to save ... I got no sense data.... */ 93 if (cqr->retries > 0) { 94 DEV_MESSAGE (KERN_DEBUG, device, 95 "default ERP called (%i retries left)", 96 cqr->retries); 97 cqr->lpm = LPM_ANYPATH; 98 cqr->status = DASD_CQR_FILLED; 99 } else { 100 DEV_MESSAGE (KERN_WARNING, device, "%s", 101 "default ERP called (NO retry left)"); 102 cqr->status = DASD_CQR_FAILED; 103 cqr->stopclk = get_clock(); 104 } 105 return cqr; 106 } /* end dasd_default_erp_action */ 107 108 /* 109 * DESCRIPTION 110 * Frees all ERPs of the current ERP Chain and set the status 111 * of the original CQR either to DASD_CQR_DONE if ERP was successful 112 * or to DASD_CQR_FAILED if ERP was NOT successful. 113 * NOTE: This function is only called if no discipline postaction 114 * is available 115 * 116 * PARAMETER 117 * erp current erp_head 118 * 119 * RETURN VALUES 120 * cqr pointer to the original CQR 121 */ 122 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr) 123 { 124 int success; 125 126 BUG_ON(cqr->refers == NULL || cqr->function == NULL); 127 128 success = cqr->status == DASD_CQR_DONE; 129 130 /* free all ERPs - but NOT the original cqr */ 131 while (cqr->refers != NULL) { 132 struct dasd_ccw_req *refers; 133 134 refers = cqr->refers; 135 /* remove the request from the block queue */ 136 list_del(&cqr->blocklist); 137 /* free the finished erp request */ 138 dasd_free_erp_request(cqr, cqr->memdev); 139 cqr = refers; 140 } 141 142 /* set corresponding status to original cqr */ 143 if (success) 144 cqr->status = DASD_CQR_DONE; 145 else { 146 cqr->status = DASD_CQR_FAILED; 147 cqr->stopclk = get_clock(); 148 } 149 150 return cqr; 151 152 } /* end default_erp_postaction */ 153 154 void 155 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) 156 { 157 struct dasd_device *device; 158 159 device = cqr->startdev; 160 /* dump sense data */ 161 if (device->discipline && device->discipline->dump_sense) 162 device->discipline->dump_sense(device, cqr, irb); 163 } 164 165 EXPORT_SYMBOL(dasd_default_erp_action); 166 EXPORT_SYMBOL(dasd_default_erp_postaction); 167 EXPORT_SYMBOL(dasd_alloc_erp_request); 168 EXPORT_SYMBOL(dasd_free_erp_request); 169 EXPORT_SYMBOL(dasd_log_sense); 170