* 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>
#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;
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)
{
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)
{
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)
{
struct dasd_device *device;
unsigned long long expires;
unsigned long flags;
- char status;
- int ip;
-
- /*
- * 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)
- return;
- status = *((char *) &S390_lowcore.ext_params + 5);
- ip = S390_lowcore.ext_params;
+ u8 int_code, status;
+ addr_t ip;
+ int rc;
+ 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;
+ }
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,
/* 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;
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);
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;
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) {
private->pt_block = 2;
break;
default:
+ DEV_MESSAGE(KERN_WARNING, device, "unsupported device class "
+ "(class=%d)", private->rdc_data.vdev_class);
return -ENOTSUPP;
}
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;
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)
{
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)
{
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;
}
}
}
+ 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)
{
return status;
}
+/* Fill in IOCTL data for device. */
static int
dasd_diag_fill_info(struct dasd_device * device,
struct dasd_information2_t * info)
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);
"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,
"Machine is not VM: %s "
"discipline not initializing",
dasd_diag_discipline.name);
- return -EINVAL;
+ return -ENODEV;
}
ASCEBC(dasd_diag_discipline.ebcname, 4);
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;
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:
- */
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