[patch 4/10] s390: 64 bit diag250 support.

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Date:	Mon, 29 Aug 2005 19:54:54 +0200
To: akpm@osdl.org, horst.hummel@de.ibm.com, linux-kernel@vger.kernel.org

[patch 4/10] s390: 64 bit diag250 support.

From: Horst Hummel <horst.hummel@de.ibm.com>

Add support for diag 250 access to dasd devices for 64 bit kernels.
In addition fix detach/attach for diag disks. The VM control block
needs to get recreated by a call to mdsk_init_io.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diffstat:
 drivers/s390/block/Kconfig | 2
 drivers/s390/block/dasd_diag.c | 332 ++++++++++++++++++++++++++---------------
 drivers/s390/block/dasd_diag.h | 105 +++++++++++-
 3 files changed, 306 insertions(+), 133 deletions(-)

diff -urpN linux-2.6/drivers/s390/block/dasd_diag.c linux-2.6-patched/drivers/s390/block/dasd_diag.c
--- linux-2.6/drivers/s390/block/dasd_diag.c 2005-08-29 01:41:01.000000000 +0200
+++ linux-2.6-patched/drivers/s390/block/dasd_diag.c 2005-08-29 19:18:07.000000000 +0200
@@ -6,17 +6,18 @@
  * Bugreports.to..: <Linux390@de.ibm.com>
  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
  *
- * $Revision: 1.42 $
+ * $Revision: 1.49 $
  */
 
 #include <linux/config.h>
 #include <linux/stddef.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
-#include <linux/hdreg.h> /* HDIO_GETGEO */
+#include <linux/hdreg.h>
 #include <linux/bio.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/jiffies.h>
 
 #include <asm/dasd.h>
 #include <asm/debug.h>
@@ -28,58 +29,89 @@
 #include "dasd_int.h"
 #include "dasd_diag.h"
 
-#ifdef PRINTK_HEADER
-#undef PRINTK_HEADER
-#endif /* PRINTK_HEADER */
 #define PRINTK_HEADER "dasd(diag):"
 
 MODULE_LICENSE("GPL");
 
+/* The maximum number of blocks per request (max_blocks) is dependent on the
+ * amount of storage that is available in the static I/O buffer for each
+ * device. Currently each device gets 2 pages. We want to fit two requests
+ * into the available memory so that we can immediately start the next if one
+ * finishes. */
+#define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
+ sizeof(struct dasd_diag_req)) / \
+ sizeof(struct dasd_diag_bio)) / 2)
+#define DIAG_MAX_RETRIES 32
+#define DIAG_TIMEOUT 50 * HZ
+
 struct dasd_discipline dasd_diag_discipline;
 
 struct dasd_diag_private {
         struct dasd_diag_characteristics rdc_data;
         struct dasd_diag_rw_io iob;
         struct dasd_diag_init_io iib;
- unsigned int pt_block;
+ blocknum_t pt_block;
 };
 
 struct dasd_diag_req {
- int block_count;
+ unsigned int block_count;
         struct dasd_diag_bio bio[0];
 };
 
+static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
+
+/* Perform DIAG250 call with block I/O parameter list iob (input and output)
+ * and function code cmd.
+ * In case of an exception return 3. Otherwise return result of bitwise OR of
+ * resulting condition code and DIAG return code. */
 static __inline__ int
 dia250(void *iob, int cmd)
 {
+ typedef struct {
+ char _[max(sizeof (struct dasd_diag_init_io),
+ sizeof (struct dasd_diag_rw_io))];
+ } addr_type;
         int rc;
 
- __asm__ __volatile__(" lhi %0,3\n"
- " lr 0,%2\n"
- " diag 0,%1,0x250\n"
- "0: ipm %0\n"
- " srl %0,28\n"
- " or %0,1\n"
- "1:\n"
-#ifndef CONFIG_ARCH_S390X
- ".section __ex_table,\"a\"\n"
- " .align 4\n"
- " .long 0b,1b\n"
- ".previous\n"
+ __asm__ __volatile__(
+#ifdef CONFIG_ARCH_S390X
+ " lghi %0,3\n"
+ " lgr 0,%3\n"
+ " diag 0,%2,0x250\n"
+ "0: ipm %0\n"
+ " srl %0,28\n"
+ " or %0,1\n"
+ "1:\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 8\n"
+ " .quad 0b,1b\n"
+ ".previous\n"
 #else
- ".section __ex_table,\"a\"\n"
- " .align 8\n"
- " .quad 0b,1b\n"
- ".previous\n"
+ " lhi %0,3\n"
+ " lr 0,%3\n"
+ " diag 0,%2,0x250\n"
+ "0: ipm %0\n"
+ " srl %0,28\n"
+ " or %0,1\n"
+ "1:\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,1b\n"
+ ".previous\n"
 #endif
- : "=&d" (rc)
- : "d" (cmd), "d" ((void *) __pa(iob))
- : "0", "1", "cc");
+ : "=&d" (rc), "=m" (*(addr_type *) iob)
+ : "d" (cmd), "d" (iob), "m" (*(addr_type *) iob)
+ : "0", "1", "cc");
         return rc;
 }
 
+/* Initialize block I/O to DIAG device using the specified blocksize and
+ * block offset. On success, return zero and set end_block to contain the
+ * number of blocks on the device minus the specified offset. Return non-zero
+ * otherwise. */
 static __inline__ int
-mdsk_init_io(struct dasd_device * device, int blocksize, int offset, int size)
+mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
+ blocknum_t offset, blocknum_t *end_block)
 {
         struct dasd_diag_private *private;
         struct dasd_diag_init_io *iib;
@@ -92,14 +124,18 @@ mdsk_init_io(struct dasd_device * device
         iib->dev_nr = _ccw_device_get_device_number(device->cdev);
         iib->block_size = blocksize;
         iib->offset = offset;
- iib->start_block = 0;
- iib->end_block = size;
+ iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
 
         rc = dia250(iib, INIT_BIO);
 
- return rc & 3;
+ if ((rc & 3) == 0 && end_block)
+ *end_block = iib->end_block;
+
+ return rc;
 }
 
+/* Remove block I/O environment for device. Return zero on success, non-zero
+ * otherwise. */
 static __inline__ int
 mdsk_term_io(struct dasd_device * device)
 {
@@ -112,9 +148,25 @@ mdsk_term_io(struct dasd_device * device
         memset(iib, 0, sizeof (struct dasd_diag_init_io));
         iib->dev_nr = _ccw_device_get_device_number(device->cdev);
         rc = dia250(iib, TERM_BIO);
- return rc & 3;
+ return rc;
+}
+
+/* Error recovery for failed DIAG requests - try to reestablish the DIAG
+ * environment. */
+static void
+dasd_diag_erp(struct dasd_device *device)
+{
+ int rc;
+
+ mdsk_term_io(device);
+ rc = mdsk_init_io(device, device->bp_block, 0, NULL);
+ if (rc)
+ DEV_MESSAGE(KERN_WARNING, device, "DIAG ERP unsuccessful, "
+ "rc=%d", rc);
 }
 
+/* Start a given request at the device. Return zero on success, non-zero
+ * otherwise. */
 static int
 dasd_start_diag(struct dasd_ccw_req * cqr)
 {
@@ -124,32 +176,66 @@ dasd_start_diag(struct dasd_ccw_req * cq
         int rc;
 
         device = cqr->device;
+ if (cqr->retries < 0) {
+ DEV_MESSAGE(KERN_WARNING, device, "DIAG start_IO: request %p "
+ "- no retry left)", cqr);
+ cqr->status = DASD_CQR_FAILED;
+ return -EIO;
+ }
         private = (struct dasd_diag_private *) device->private;
         dreq = (struct dasd_diag_req *) cqr->data;
 
         private->iob.dev_nr = _ccw_device_get_device_number(device->cdev);
         private->iob.key = 0;
- private->iob.flags = 2; /* do asynchronous io */
+ private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
         private->iob.block_count = dreq->block_count;
- private->iob.interrupt_params = (u32)(addr_t) cqr;
+ private->iob.interrupt_params = (addr_t) cqr;
         private->iob.bio_list = __pa(dreq->bio);
+ private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 
         cqr->startclk = get_clock();
+ cqr->starttime = jiffies;
+ cqr->retries--;
 
         rc = dia250(&private->iob, RW_BIO);
- if (rc > 8) {
- DEV_MESSAGE(KERN_WARNING, device, "dia250 returned CC %d", rc);
- cqr->status = DASD_CQR_ERROR;
- } else if (rc == 0) {
+ switch (rc) {
+ case 0: /* Synchronous I/O finished successfully */
+ cqr->stopclk = get_clock();
                 cqr->status = DASD_CQR_DONE;
- dasd_schedule_bh(device);
- } else {
+ /* Indicate to calling function that only a dasd_schedule_bh()
+ and no timer is needed */
+ rc = -EACCES;
+ break;
+ case 8: /* Asynchronous I/O was started */
                 cqr->status = DASD_CQR_IN_IO;
                 rc = 0;
+ break;
+ default: /* Error condition */
+ cqr->status = DASD_CQR_QUEUED;
+ DEV_MESSAGE(KERN_WARNING, device, "dia250 returned rc=%d", rc);
+ dasd_diag_erp(device);
+ rc = -EIO;
+ break;
         }
         return rc;
 }
 
+/* Terminate given request at the device. */
+static int
+dasd_diag_term_IO(struct dasd_ccw_req * cqr)
+{
+ struct dasd_device *device;
+
+ device = cqr->device;
+ mdsk_term_io(device);
+ mdsk_init_io(device, device->bp_block, 0, NULL);
+ cqr->status = DASD_CQR_CLEAR;
+ cqr->stopclk = get_clock();
+ dasd_schedule_bh(device);
+ return 0;
+}
+
+/* Handle external interruption. */
 static void
 dasd_ext_handler(struct pt_regs *regs, __u16 code)
 {
@@ -157,25 +243,27 @@ dasd_ext_handler(struct pt_regs *regs, _
         struct dasd_device *device;
         unsigned long long expires;
         unsigned long flags;
- char status;
- int ip;
+ u8 int_code, status;
+ addr_t ip;
+ int rc;
 
- /*
- * Get the external interruption subcode. VM stores
- * this in the 'cpu address' field associated with
- * the external interrupt. For diag 250 the subcode
- * needs to be 3.
- */
- if ((S390_lowcore.cpu_addr & 0xff00) != 0x0300)
+ int_code = *((u8 *) DASD_DIAG_LC_INT_CODE);
+ status = *((u8 *) DASD_DIAG_LC_INT_STATUS);
+ switch (int_code) {
+ case DASD_DIAG_CODE_31BIT:
+ ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT);
+ break;
+ case DASD_DIAG_CODE_64BIT:
+ ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT);
+ break;
+ default:
                 return;
- status = *((char *) &S390_lowcore.ext_params + 5);
- ip = S390_lowcore.ext_params;
-
+ }
         if (!ip) { /* no intparm: unsolicited interrupt */
                 MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt");
                 return;
         }
- cqr = (struct dasd_ccw_req *)(addr_t) ip;
+ cqr = (struct dasd_ccw_req *) ip;
         device = (struct dasd_device *) cqr->device;
         if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
                 DEV_MESSAGE(KERN_WARNING, device,
@@ -188,6 +276,15 @@ dasd_ext_handler(struct pt_regs *regs, _
         /* get irq lock to modify request queue */
         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 
+ /* Check for a pending clear operation */
+ if (cqr->status == DASD_CQR_CLEAR) {
+ cqr->status = DASD_CQR_QUEUED;
+ dasd_clear_timer(device);
+ dasd_schedule_bh(device);
+ spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
+ return;
+ }
+
         cqr->stopclk = get_clock();
 
         expires = 0;
@@ -198,16 +295,22 @@ dasd_ext_handler(struct pt_regs *regs, _
                         next = list_entry(device->ccw_queue.next,
                                           struct dasd_ccw_req, list);
                         if (next->status == DASD_CQR_QUEUED) {
- if (dasd_start_diag(next) == 0)
+ rc = dasd_start_diag(next);
+ if (rc == 0)
                                         expires = next->expires;
- else
+ else if (rc != -EACCES)
                                         DEV_MESSAGE(KERN_WARNING, device, "%s",
                                                     "Interrupt fastpath "
                                                     "failed!");
                         }
                 }
- } else
- cqr->status = DASD_CQR_FAILED;
+ } else {
+ cqr->status = DASD_CQR_QUEUED;
+ DEV_MESSAGE(KERN_WARNING, device, "interrupt status for "
+ "request %p was %d (%d retries left)", cqr, status,
+ cqr->retries);
+ dasd_diag_erp(device);
+ }
 
         if (expires != 0)
                 dasd_set_timer(device, expires);
@@ -218,14 +321,17 @@ dasd_ext_handler(struct pt_regs *regs, _
         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 }
 
+/* Check whether device can be controlled by DIAG discipline. Return zero on
+ * success, non-zero otherwise. */
 static int
 dasd_diag_check_device(struct dasd_device *device)
 {
         struct dasd_diag_private *private;
         struct dasd_diag_characteristics *rdc_data;
         struct dasd_diag_bio bio;
- long *label;
- int sb, bsize;
+ struct dasd_diag_cms_label *label;
+ blocknum_t end_block;
+ unsigned int sb, bsize;
         int rc;
 
         private = (struct dasd_diag_private *) device->private;
@@ -244,8 +350,11 @@ dasd_diag_check_device(struct dasd_devic
         rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
 
         rc = diag210((struct diag210 *) rdc_data);
- if (rc)
+ if (rc) {
+ DEV_MESSAGE(KERN_WARNING, device, "failed to retrieve device "
+ "information (rc=%d)", rc);
                 return -ENOTSUPP;
+ }
 
         /* Figure out position of label block */
         switch (private->rdc_data.vdev_class) {
@@ -256,6 +365,8 @@ dasd_diag_check_device(struct dasd_devic
                 private->pt_block = 2;
                 break;
         default:
+ DEV_MESSAGE(KERN_WARNING, device, "unsupported device class "
+ "(class=%d)", private->rdc_data.vdev_class);
                 return -ENOTSUPP;
         }
 
@@ -269,15 +380,17 @@ dasd_diag_check_device(struct dasd_devic
         mdsk_term_io(device);
 
         /* figure out blocksize of device */
- label = (long *) get_zeroed_page(GFP_KERNEL);
+ label = (struct dasd_diag_cms_label *) get_zeroed_page(GFP_KERNEL);
         if (label == NULL) {
                 DEV_MESSAGE(KERN_WARNING, device, "%s",
                             "No memory to allocate initialization request");
                 return -ENOMEM;
         }
+ rc = 0;
+ end_block = 0;
         /* try all sizes - needed for ECKD devices */
         for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
- mdsk_init_io(device, bsize, 0, 64);
+ mdsk_init_io(device, bsize, 0, &end_block);
                 memset(&bio, 0, sizeof (struct dasd_diag_bio));
                 bio.type = MDSK_READ_REQ;
                 bio.block_number = private->pt_block + 1;
@@ -289,37 +402,45 @@ dasd_diag_check_device(struct dasd_devic
                 private->iob.block_count = 1;
                 private->iob.interrupt_params = 0;
                 private->iob.bio_list = __pa(&bio);
- if (dia250(&private->iob, RW_BIO) == 0)
+ private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
+ rc = dia250(&private->iob, RW_BIO);
+ if (rc == 0 || rc == 3)
                         break;
                 mdsk_term_io(device);
         }
- if (bsize <= PAGE_SIZE && label[0] == 0xc3d4e2f1) {
- /* get formatted blocksize from label block */
- bsize = (int) label[3];
- device->blocks = label[7];
+ if (rc == 3) {
+ DEV_MESSAGE(KERN_WARNING, device, "%s", "DIAG call failed");
+ rc = -EOPNOTSUPP;
+ } else if (rc != 0) {
+ DEV_MESSAGE(KERN_WARNING, device, "device access failed "
+ "(rc=%d)", rc);
+ rc = -EIO;
+ } else {
+ if (memcmp(label->label_id, DASD_DIAG_CMS1,
+ sizeof(DASD_DIAG_CMS1)) == 0) {
+ /* get formatted blocksize from label block */
+ bsize = (unsigned int) label->block_size;
+ device->blocks = (unsigned long) label->block_count;
+ } else
+ device->blocks = end_block;
                 device->bp_block = bsize;
                 device->s2b_shift = 0; /* bits to shift 512 to get a block */
                 for (sb = 512; sb < bsize; sb = sb << 1)
                         device->s2b_shift++;
                 
                 DEV_MESSAGE(KERN_INFO, device,
- "capacity (%dkB blks): %ldkB",
- (device->bp_block >> 10),
- (device->blocks << device->s2b_shift) >> 1);
+ "(%ld B/blk): %ldkB",
+ (unsigned long) device->bp_block,
+ (unsigned long) (device->blocks <<
+ device->s2b_shift) >> 1);
                 rc = 0;
- } else {
- if (bsize > PAGE_SIZE)
- DEV_MESSAGE(KERN_WARNING, device, "%s",
- "DIAG access failed");
- else
- DEV_MESSAGE(KERN_WARNING, device, "%s",
- "volume is not CMS formatted");
- rc = -EMEDIUMTYPE;
         }
         free_page((long) label);
         return rc;
 }
 
+/* Fill in virtual disk geometry for device. Return zero on success, non-zero
+ * otherwise. */
 static int
 dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
 {
@@ -349,6 +470,8 @@ dasd_diag_erp_postaction(struct dasd_ccw
         return dasd_default_erp_postaction;
 }
 
+/* Create DASD request from block device request. Return pointer to new
+ * request on success, ERR_PTR otherwise. */
 static struct dasd_ccw_req *
 dasd_diag_build_cp(struct dasd_device * device, struct request *req)
 {
@@ -358,9 +481,9 @@ dasd_diag_build_cp(struct dasd_device *
         struct bio *bio;
         struct bio_vec *bv;
         char *dst;
- int count, datasize;
+ unsigned int count, datasize;
         sector_t recid, first_rec, last_rec;
- unsigned blksize, off;
+ unsigned int blksize, off;
         unsigned char rw_cmd;
         int i;
 
@@ -413,13 +536,16 @@ dasd_diag_build_cp(struct dasd_device *
                         }
                 }
         }
+ cqr->retries = DIAG_MAX_RETRIES;
         cqr->buildclk = get_clock();
         cqr->device = device;
- cqr->expires = 50 * HZ; /* 50 seconds */
+ cqr->expires = DIAG_TIMEOUT;
         cqr->status = DASD_CQR_FILLED;
         return cqr;
 }
 
+/* Release DASD request. Return non-zero if request was successful, zero
+ * otherwise. */
 static int
 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 {
@@ -430,6 +556,7 @@ dasd_diag_free_cp(struct dasd_ccw_req *c
         return status;
 }
 
+/* Fill in IOCTL data for device. */
 static int
 dasd_diag_fill_info(struct dasd_device * device,
                     struct dasd_information2_t * info)
@@ -437,7 +564,7 @@ dasd_diag_fill_info(struct dasd_device *
         struct dasd_diag_private *private;
 
         private = (struct dasd_diag_private *) device->private;
- info->label_block = private->pt_block;
+ info->label_block = (unsigned int) private->pt_block;
         info->FBA_layout = 1;
         info->format = DASD_FORMAT_LDL;
         info->characteristics_size = sizeof (struct dasd_diag_characteristics);
@@ -456,26 +583,15 @@ dasd_diag_dump_sense(struct dasd_device
                     "dump sense not available for DIAG data");
 }
 
-/*
- * max_blocks is dependent on the amount of storage that is available
- * in the static io buffer for each device. Currently each device has
- * 8192 bytes (=2 pages). dasd diag is only relevant for 31 bit.
- * The struct dasd_ccw_req has 96 bytes, the struct dasd_diag_req has
- * 8 bytes and the struct dasd_diag_bio for each block has 16 bytes.
- * That makes:
- * (8192 - 96 - 8) / 16 = 505.5 blocks at maximum.
- * We want to fit two into the available memory so that we can immediately
- * start the next request if one finishes off. That makes 252.75 blocks
- * for one request. Give a little safety and the result is 240.
- */
 struct dasd_discipline dasd_diag_discipline = {
         .owner = THIS_MODULE,
         .name = "DIAG",
         .ebcname = "DIAG",
- .max_blocks = 240,
+ .max_blocks = DIAG_MAX_BLOCKS,
         .check_device = dasd_diag_check_device,
         .fill_geometry = dasd_diag_fill_geometry,
         .start_IO = dasd_start_diag,
+ .term_IO = dasd_diag_term_IO,
         .examine_error = dasd_diag_examine_error,
         .erp_action = dasd_diag_erp_action,
         .erp_postaction = dasd_diag_erp_postaction,
@@ -493,7 +609,7 @@ dasd_diag_init(void)
                             "Machine is not VM: %s "
                             "discipline not initializing",
                             dasd_diag_discipline.name);
- return -EINVAL;
+ return -ENODEV;
         }
         ASCEBC(dasd_diag_discipline.ebcname, 4);
 
@@ -506,13 +622,6 @@ dasd_diag_init(void)
 static void __exit
 dasd_diag_cleanup(void)
 {
- if (!MACHINE_IS_VM) {
- MESSAGE_LOG(KERN_INFO,
- "Machine is not VM: %s "
- "discipline not cleaned",
- dasd_diag_discipline.name);
- return;
- }
         unregister_external_interrupt(0x2603, dasd_ext_handler);
         ctl_clear_bit(0, 9);
         dasd_diag_discipline_pointer = NULL;
@@ -520,22 +629,3 @@ dasd_diag_cleanup(void)
 
 module_init(dasd_diag_init);
 module_exit(dasd_diag_cleanup);
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-indent-level: 4
- * c-brace-imaginary-offset: 0
- * c-brace-offset: -4
- * c-argdecl-indent: 4
- * c-label-offset: -4
- * c-continued-statement-offset: 4
- * c-continued-brace-offset: 0
- * indent-tabs-mode: 1
- * tab-width: 8
- * End:
- */
diff -urpN linux-2.6/drivers/s390/block/dasd_diag.h linux-2.6-patched/drivers/s390/block/dasd_diag.h
--- linux-2.6/drivers/s390/block/dasd_diag.h 2005-08-29 01:41:01.000000000 +0200
+++ linux-2.6-patched/drivers/s390/block/dasd_diag.h 2005-08-29 19:18:07.000000000 +0200
@@ -6,7 +6,7 @@
  * Bugreports.to..: <Linux390@de.ibm.com>
  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
  *
- * $Revision: 1.6 $
+ * $Revision: 1.7 $
  */
 
 #define MDSK_WRITE_REQ 0x01
@@ -19,6 +19,18 @@
 #define DEV_CLASS_FBA 0x01
 #define DEV_CLASS_ECKD 0x04
 
+#define DASD_DIAG_LC_INT_CODE 132
+#define DASD_DIAG_LC_INT_STATUS 133
+#define DASD_DIAG_LC_INT_PARM_31BIT 128
+#define DASD_DIAG_LC_INT_PARM_64BIT 4536
+#define DASD_DIAG_CODE_31BIT 0x03
+#define DASD_DIAG_CODE_64BIT 0x07
+
+#define DASD_DIAG_RWFLAG_ASYNC 0x02
+#define DASD_DIAG_RWFLAG_NOCACHE 0x01
+
+#define DASD_DIAG_FLAGA_FORMAT_64BIT 0x80
+
 struct dasd_diag_characteristics {
         u16 dev_nr;
         u16 rdc_len;
@@ -32,35 +44,106 @@ struct dasd_diag_characteristics {
         u8 rdev_features;
 } __attribute__ ((packed, aligned(4)));
 
+struct dasd_diag_cms_label {
+ u8 label_id[4];
+ u8 vol_id[6];
+ u16 version_id;
+ u32 block_size;
+ u32 origin_ptr;
+ u32 usable_count;
+ u32 formatted_count;
+ u32 block_count;
+ u32 used_count;
+ u32 fst_size;
+ u32 fst_count;
+ u8 format_date[6];
+ u8 reserved1[2];
+ u32 disk_offset;
+ u32 map_block;
+ u32 hblk_disp;
+ u32 user_disp;
+ u8 reserved2[4];
+ u8 segment_name[8];
+} __attribute__ ((packed));
+
+#ifdef CONFIG_ARCH_S390X
+#define DASD_DIAG_FLAGA_DEFAULT DASD_DIAG_FLAGA_FORMAT_64BIT
+
+typedef u64 blocknum_t;
+typedef s64 sblocknum_t;
+
+struct dasd_diag_bio {
+ u8 type;
+ u8 status;
+ u8 spare1[2];
+ u32 alet;
+ blocknum_t block_number;
+ u64 buffer;
+} __attribute__ ((packed, aligned(8)));
+
+struct dasd_diag_init_io {
+ u16 dev_nr;
+ u8 flaga;
+ u8 spare1[21];
+ u32 block_size;
+ u8 spare2[4];
+ blocknum_t offset;
+ sblocknum_t start_block;
+ blocknum_t end_block;
+ u8 spare3[8];
+} __attribute__ ((packed, aligned(8)));
+
+struct dasd_diag_rw_io {
+ u16 dev_nr;
+ u8 flaga;
+ u8 spare1[21];
+ u8 key;
+ u8 flags;
+ u8 spare2[2];
+ u32 block_count;
+ u32 alet;
+ u8 spare3[4];
+ u64 interrupt_params;
+ u64 bio_list;
+ u8 spare4[8];
+} __attribute__ ((packed, aligned(8)));
+#else /* CONFIG_ARCH_S390X */
+#define DASD_DIAG_FLAGA_DEFAULT 0x0
+
+typedef u32 blocknum_t;
+typedef s32 sblocknum_t;
+
 struct dasd_diag_bio {
         u8 type;
         u8 status;
         u16 spare1;
- u32 block_number;
+ blocknum_t block_number;
         u32 alet;
         u32 buffer;
 } __attribute__ ((packed, aligned(8)));
 
 struct dasd_diag_init_io {
         u16 dev_nr;
- u16 spare1[11];
+ u8 flaga;
+ u8 spare1[21];
         u32 block_size;
- u32 offset;
- u32 start_block;
- u32 end_block;
- u32 spare2[6];
+ blocknum_t offset;
+ sblocknum_t start_block;
+ blocknum_t end_block;
+ u8 spare2[24];
 } __attribute__ ((packed, aligned(8)));
 
 struct dasd_diag_rw_io {
         u16 dev_nr;
- u16 spare1[11];
+ u8 flaga;
+ u8 spare1[21];
         u8 key;
         u8 flags;
- u16 spare2;
+ u8 spare2[2];
         u32 block_count;
         u32 alet;
         u32 bio_list;
         u32 interrupt_params;
- u32 spare3[5];
+ u8 spare3[20];
 } __attribute__ ((packed, aligned(8)));
-
+#endif /* CONFIG_ARCH_S390X */
diff -urpN linux-2.6/drivers/s390/block/Kconfig linux-2.6-patched/drivers/s390/block/Kconfig
--- linux-2.6/drivers/s390/block/Kconfig 2005-08-29 01:41:01.000000000 +0200
+++ linux-2.6-patched/drivers/s390/block/Kconfig 2005-08-29 19:18:07.000000000 +0200
@@ -49,7 +49,7 @@ config DASD_FBA
 
 config DASD_DIAG
         tristate "Support for DIAG access to Disks"
- depends on DASD && ARCH_S390X = 'n'
+ depends on DASD && ( ARCH_S390X = 'n' || EXPERIMENTAL)
         help
           Select this option if you want to use Diagnose250 command to access
           Disks under VM. If you are not running under VM or unsure what it is,
-
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