1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
254 lines
6.5 KiB
C
254 lines
6.5 KiB
C
/*
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* File...........: linux/drivers/s390/block/dasd.c
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Horst Hummel <Horst.Hummel@de.ibm.com>
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* Carsten Otte <Cotte@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
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*
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* $Revision: 1.14 $
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*/
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#include <linux/config.h>
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#include <linux/ctype.h>
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#include <linux/init.h>
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#include <asm/debug.h>
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#include <asm/ebcdic.h>
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#include <asm/uaccess.h>
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/* This is ugly... */
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#define PRINTK_HEADER "dasd_erp:"
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#include "dasd_int.h"
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struct dasd_ccw_req *
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dasd_alloc_erp_request(char *magic, int cplength, int datasize,
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struct dasd_device * device)
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{
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unsigned long flags;
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struct dasd_ccw_req *cqr;
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char *data;
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int size;
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/* Sanity checks */
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if ( magic == NULL || datasize > PAGE_SIZE ||
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(cplength*sizeof(struct ccw1)) > PAGE_SIZE)
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BUG();
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size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
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if (cplength > 0)
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size += cplength * sizeof(struct ccw1);
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if (datasize > 0)
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size += datasize;
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spin_lock_irqsave(&device->mem_lock, flags);
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cqr = (struct dasd_ccw_req *)
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dasd_alloc_chunk(&device->erp_chunks, size);
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spin_unlock_irqrestore(&device->mem_lock, flags);
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if (cqr == NULL)
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return ERR_PTR(-ENOMEM);
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memset(cqr, 0, sizeof(struct dasd_ccw_req));
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data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
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cqr->cpaddr = NULL;
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if (cplength > 0) {
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cqr->cpaddr = (struct ccw1 *) data;
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data += cplength*sizeof(struct ccw1);
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memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
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}
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cqr->data = NULL;
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if (datasize > 0) {
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cqr->data = data;
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memset(cqr->data, 0, datasize);
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}
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strncpy((char *) &cqr->magic, magic, 4);
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ASCEBC((char *) &cqr->magic, 4);
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set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
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dasd_get_device(device);
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return cqr;
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}
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void
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dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
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{
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unsigned long flags;
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spin_lock_irqsave(&device->mem_lock, flags);
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dasd_free_chunk(&device->erp_chunks, cqr);
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spin_unlock_irqrestore(&device->mem_lock, flags);
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atomic_dec(&device->ref_count);
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}
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/*
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* dasd_default_erp_action just retries the current cqr
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*/
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struct dasd_ccw_req *
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dasd_default_erp_action(struct dasd_ccw_req * cqr)
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{
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struct dasd_device *device;
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device = cqr->device;
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/* just retry - there is nothing to save ... I got no sense data.... */
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if (cqr->retries > 0) {
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DEV_MESSAGE (KERN_DEBUG, device,
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"default ERP called (%i retries left)",
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cqr->retries);
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cqr->lpm = LPM_ANYPATH;
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cqr->status = DASD_CQR_QUEUED;
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} else {
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DEV_MESSAGE (KERN_WARNING, device, "%s",
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"default ERP called (NO retry left)");
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cqr->status = DASD_CQR_FAILED;
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cqr->stopclk = get_clock ();
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}
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return cqr;
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} /* end dasd_default_erp_action */
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/*
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* DESCRIPTION
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* Frees all ERPs of the current ERP Chain and set the status
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* of the original CQR either to DASD_CQR_DONE if ERP was successful
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* or to DASD_CQR_FAILED if ERP was NOT successful.
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* NOTE: This function is only called if no discipline postaction
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* is available
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*
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* PARAMETER
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* erp current erp_head
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*
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* RETURN VALUES
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* cqr pointer to the original CQR
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*/
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struct dasd_ccw_req *
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dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
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{
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struct dasd_device *device;
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int success;
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if (cqr->refers == NULL || cqr->function == NULL)
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BUG();
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device = cqr->device;
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success = cqr->status == DASD_CQR_DONE;
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/* free all ERPs - but NOT the original cqr */
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while (cqr->refers != NULL) {
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struct dasd_ccw_req *refers;
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refers = cqr->refers;
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/* remove the request from the device queue */
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list_del(&cqr->list);
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/* free the finished erp request */
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dasd_free_erp_request(cqr, device);
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cqr = refers;
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}
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/* set corresponding status to original cqr */
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if (success)
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cqr->status = DASD_CQR_DONE;
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else {
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cqr->status = DASD_CQR_FAILED;
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cqr->stopclk = get_clock();
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}
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return cqr;
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} /* end default_erp_postaction */
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/*
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* Print the hex dump of the memory used by a request. This includes
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* all error recovery ccws that have been chained in from of the
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* real request.
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*/
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static inline void
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hex_dump_memory(struct dasd_device *device, void *data, int len)
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{
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int *pint;
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pint = (int *) data;
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while (len > 0) {
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DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
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pint, pint[0], pint[1], pint[2], pint[3]);
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pint += 4;
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len -= 16;
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}
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}
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void
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dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
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{
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struct dasd_device *device;
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device = cqr->device;
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/* dump sense data */
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if (device->discipline && device->discipline->dump_sense)
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device->discipline->dump_sense(device, cqr, irb);
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}
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void
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dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
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{
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struct dasd_device *device;
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struct dasd_ccw_req *lcqr;
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struct ccw1 *ccw;
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int cplength;
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device = cqr->device;
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/* log the channel program */
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for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
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DEV_MESSAGE(KERN_ERR, device,
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"(%s) ERP chain report for req: %p",
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caller == 0 ? "EXAMINE" : "ACTION", lcqr);
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hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
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cplength = 1;
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ccw = lcqr->cpaddr;
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while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
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cplength++;
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if (cplength > 40) { /* log only parts of the CP */
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DEV_MESSAGE(KERN_ERR, device, "%s",
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"Start of channel program:");
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hex_dump_memory(device, lcqr->cpaddr,
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40*sizeof(struct ccw1));
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DEV_MESSAGE(KERN_ERR, device, "%s",
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"End of channel program:");
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hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
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10*sizeof(struct ccw1));
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} else { /* log the whole CP */
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DEV_MESSAGE(KERN_ERR, device, "%s",
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"Channel program (complete):");
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hex_dump_memory(device, lcqr->cpaddr,
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cplength*sizeof(struct ccw1));
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}
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if (lcqr != cqr)
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continue;
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/*
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* Log bytes arround failed CCW but only if we did
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* not log the whole CP of the CCW is outside the
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* logged CP.
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*/
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if (cplength > 40 ||
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((addr_t) cpa < (addr_t) lcqr->cpaddr &&
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(addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
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DEV_MESSAGE(KERN_ERR, device,
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"Failed CCW (%p) (area):",
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(void *) (long) cpa);
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hex_dump_memory(device, cqr->cpaddr - 10,
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20*sizeof(struct ccw1));
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}
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}
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} /* end log_erp_chain */
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EXPORT_SYMBOL(dasd_default_erp_action);
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EXPORT_SYMBOL(dasd_default_erp_postaction);
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EXPORT_SYMBOL(dasd_alloc_erp_request);
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EXPORT_SYMBOL(dasd_free_erp_request);
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EXPORT_SYMBOL(dasd_log_sense);
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EXPORT_SYMBOL(dasd_log_ccw);
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