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path: root/drivers/s390/block/dasd_erp.c
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Diffstat (limited to 'drivers/s390/block/dasd_erp.c')
-rw-r--r--drivers/s390/block/dasd_erp.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_erp.c b/drivers/s390/block/dasd_erp.c
new file mode 100644
index 00000000000..7cb98d25f34
--- /dev/null
+++ b/drivers/s390/block/dasd_erp.c
@@ -0,0 +1,254 @@
+/*
+ * File...........: linux/drivers/s390/block/dasd.c
+ * 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>
+ * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
+ *
+ * $Revision: 1.14 $
+ */
+
+#include <linux/config.h>
+#include <linux/ctype.h>
+#include <linux/init.h>
+
+#include <asm/debug.h>
+#include <asm/ebcdic.h>
+#include <asm/uaccess.h>
+
+/* This is ugly... */
+#define PRINTK_HEADER "dasd_erp:"
+
+#include "dasd_int.h"
+
+struct dasd_ccw_req *
+dasd_alloc_erp_request(char *magic, int cplength, int datasize,
+ struct dasd_device * device)
+{
+ unsigned long flags;
+ struct dasd_ccw_req *cqr;
+ char *data;
+ int size;
+
+ /* Sanity checks */
+ if ( magic == NULL || datasize > PAGE_SIZE ||
+ (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
+ BUG();
+
+ 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));
+ 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);
+ }
+ strncpy((char *) &cqr->magic, magic, 4);
+ 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->device;
+
+ /* just retry - there is nothing to save ... I got no sense data.... */
+ if (cqr->retries > 0) {
+ DEV_MESSAGE (KERN_DEBUG, device,
+ "default ERP called (%i retries left)",
+ cqr->retries);
+ cqr->lpm = LPM_ANYPATH;
+ cqr->status = DASD_CQR_QUEUED;
+ } else {
+ DEV_MESSAGE (KERN_WARNING, device, "%s",
+ "default ERP called (NO retry left)");
+ cqr->status = DASD_CQR_FAILED;
+ cqr->stopclk = get_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)
+{
+ struct dasd_device *device;
+ int success;
+
+ if (cqr->refers == NULL || cqr->function == NULL)
+ BUG();
+
+ device = cqr->device;
+ success = cqr->status == DASD_CQR_DONE;
+
+ /* 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 device queue */
+ list_del(&cqr->list);
+ /* free the finished erp request */
+ dasd_free_erp_request(cqr, device);
+ cqr = refers;
+ }
+
+ /* set corresponding status to original cqr */
+ if (success)
+ cqr->status = DASD_CQR_DONE;
+ else {
+ cqr->status = DASD_CQR_FAILED;
+ cqr->stopclk = get_clock();
+ }
+
+ return cqr;
+
+} /* end default_erp_postaction */
+
+/*
+ * Print the hex dump of the memory used by a request. This includes
+ * all error recovery ccws that have been chained in from of the
+ * real request.
+ */
+static inline void
+hex_dump_memory(struct dasd_device *device, void *data, int len)
+{
+ int *pint;
+
+ pint = (int *) data;
+ while (len > 0) {
+ DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
+ pint, pint[0], pint[1], pint[2], pint[3]);
+ pint += 4;
+ len -= 16;
+ }
+}
+
+void
+dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
+{
+ struct dasd_device *device;
+
+ device = cqr->device;
+ /* dump sense data */
+ if (device->discipline && device->discipline->dump_sense)
+ device->discipline->dump_sense(device, cqr, irb);
+}
+
+void
+dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
+{
+ struct dasd_device *device;
+ struct dasd_ccw_req *lcqr;
+ struct ccw1 *ccw;
+ int cplength;
+
+ device = cqr->device;
+ /* log the channel program */
+ for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
+ DEV_MESSAGE(KERN_ERR, device,
+ "(%s) ERP chain report for req: %p",
+ caller == 0 ? "EXAMINE" : "ACTION", lcqr);
+ hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
+
+ cplength = 1;
+ ccw = lcqr->cpaddr;
+ while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
+ cplength++;
+
+ if (cplength > 40) { /* log only parts of the CP */
+ DEV_MESSAGE(KERN_ERR, device, "%s",
+ "Start of channel program:");
+ hex_dump_memory(device, lcqr->cpaddr,
+ 40*sizeof(struct ccw1));
+
+ DEV_MESSAGE(KERN_ERR, device, "%s",
+ "End of channel program:");
+ hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
+ 10*sizeof(struct ccw1));
+ } else { /* log the whole CP */
+ DEV_MESSAGE(KERN_ERR, device, "%s",
+ "Channel program (complete):");
+ hex_dump_memory(device, lcqr->cpaddr,
+ cplength*sizeof(struct ccw1));
+ }
+
+ if (lcqr != cqr)
+ continue;
+
+ /*
+ * Log bytes arround failed CCW but only if we did
+ * not log the whole CP of the CCW is outside the
+ * logged CP.
+ */
+ if (cplength > 40 ||
+ ((addr_t) cpa < (addr_t) lcqr->cpaddr &&
+ (addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
+
+ DEV_MESSAGE(KERN_ERR, device,
+ "Failed CCW (%p) (area):",
+ (void *) (long) cpa);
+ hex_dump_memory(device, cqr->cpaddr - 10,
+ 20*sizeof(struct ccw1));
+ }
+ }
+
+} /* end log_erp_chain */
+
+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);
+EXPORT_SYMBOL(dasd_log_ccw);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-27 21:30:37 +0000