Linux-2.6.12-rc2v2.6.12-rc2

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!

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);