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Diffstat (limited to 'drivers/s390/block/dasd_diag.c')
-rw-r--r--drivers/s390/block/dasd_diag.c541
1 files changed, 541 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
new file mode 100644
index 00000000000..127699830fa
--- /dev/null
+++ b/drivers/s390/block/dasd_diag.c
@@ -0,0 +1,541 @@
+/*
+ * File...........: linux/drivers/s390/block/dasd_diag.c
+ * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ * Based on.......: linux/drivers/s390/block/mdisk.c
+ * ...............: by Hartmunt Penner <hpenner@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
+ *
+ * $Revision: 1.42 $
+ */
+
+#include <linux/config.h>
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/hdreg.h> /* HDIO_GETGEO */
+#include <linux/bio.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include <asm/dasd.h>
+#include <asm/debug.h>
+#include <asm/ebcdic.h>
+#include <asm/io.h>
+#include <asm/s390_ext.h>
+#include <asm/todclk.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");
+
+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;
+};
+
+struct dasd_diag_req {
+ int block_count;
+ struct dasd_diag_bio bio[0];
+};
+
+static __inline__ int
+dia250(void *iob, int cmd)
+{
+ 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"
+#else
+ ".section __ex_table,\"a\"\n"
+ " .align 8\n"
+ " .quad 0b,1b\n"
+ ".previous\n"
+#endif
+ : "=&d" (rc)
+ : "d" (cmd), "d" ((void *) __pa(iob))
+ : "0", "1", "cc");
+ return rc;
+}
+
+static __inline__ int
+mdsk_init_io(struct dasd_device * device, int blocksize, int offset, int size)
+{
+ struct dasd_diag_private *private;
+ struct dasd_diag_init_io *iib;
+ int rc;
+
+ private = (struct dasd_diag_private *) device->private;
+ iib = &private->iib;
+ memset(iib, 0, sizeof (struct dasd_diag_init_io));
+
+ 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;
+
+ rc = dia250(iib, INIT_BIO);
+
+ return rc & 3;
+}
+
+static __inline__ int
+mdsk_term_io(struct dasd_device * device)
+{
+ struct dasd_diag_private *private;
+ struct dasd_diag_init_io *iib;
+ int rc;
+
+ private = (struct dasd_diag_private *) device->private;
+ iib = &private->iib;
+ 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;
+}
+
+static int
+dasd_start_diag(struct dasd_ccw_req * cqr)
+{
+ struct dasd_device *device;
+ struct dasd_diag_private *private;
+ struct dasd_diag_req *dreq;
+ int rc;
+
+ device = cqr->device;
+ 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.block_count = dreq->block_count;
+ private->iob.interrupt_params = (u32)(addr_t) cqr;
+ private->iob.bio_list = __pa(dreq->bio);
+
+ cqr->startclk = get_clock();
+
+ 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) {
+ cqr->status = DASD_CQR_DONE;
+ dasd_schedule_bh(device);
+ } else {
+ cqr->status = DASD_CQR_IN_IO;
+ rc = 0;
+ }
+ return rc;
+}
+
+static void
+dasd_ext_handler(struct pt_regs *regs, __u16 code)
+{
+ struct dasd_ccw_req *cqr, *next;
+ 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;
+
+ if (!ip) { /* no intparm: unsolicited interrupt */
+ MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt");
+ return;
+ }
+ cqr = (struct dasd_ccw_req *)(addr_t) ip;
+ device = (struct dasd_device *) cqr->device;
+ if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
+ DEV_MESSAGE(KERN_WARNING, device,
+ " magic number of dasd_ccw_req 0x%08X doesn't"
+ " match discipline 0x%08X",
+ cqr->magic, *(int *) (&device->discipline->name));
+ return;
+ }
+
+ /* get irq lock to modify request queue */
+ spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
+
+ cqr->stopclk = get_clock();
+
+ expires = 0;
+ if (status == 0) {
+ cqr->status = DASD_CQR_DONE;
+ /* Start first request on queue if possible -> fast_io. */
+ if (!list_empty(&device->ccw_queue)) {
+ next = list_entry(device->ccw_queue.next,
+ struct dasd_ccw_req, list);
+ if (next->status == DASD_CQR_QUEUED) {
+ if (dasd_start_diag(next) == 0)
+ expires = next->expires;
+ else
+ DEV_MESSAGE(KERN_WARNING, device, "%s",
+ "Interrupt fastpath "
+ "failed!");
+ }
+ }
+ } else
+ cqr->status = DASD_CQR_FAILED;
+
+ if (expires != 0)
+ dasd_set_timer(device, expires);
+ else
+ dasd_clear_timer(device);
+ dasd_schedule_bh(device);
+
+ spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
+}
+
+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;
+ int rc;
+
+ private = (struct dasd_diag_private *) device->private;
+ if (private == NULL) {
+ private = kmalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
+ if (private == NULL) {
+ DEV_MESSAGE(KERN_WARNING, device, "%s",
+ "memory allocation failed for private data");
+ return -ENOMEM;
+ }
+ device->private = (void *) private;
+ }
+ /* Read Device Characteristics */
+ rdc_data = (void *) &(private->rdc_data);
+ rdc_data->dev_nr = _ccw_device_get_device_number(device->cdev);
+ rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
+
+ rc = diag210((struct diag210 *) rdc_data);
+ if (rc)
+ return -ENOTSUPP;
+
+ /* Figure out position of label block */
+ switch (private->rdc_data.vdev_class) {
+ case DEV_CLASS_FBA:
+ private->pt_block = 1;
+ break;
+ case DEV_CLASS_ECKD:
+ private->pt_block = 2;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ DBF_DEV_EVENT(DBF_INFO, device,
+ "%04X: %04X on real %04X/%02X",
+ rdc_data->dev_nr,
+ rdc_data->vdev_type,
+ rdc_data->rdev_type, rdc_data->rdev_model);
+
+ /* terminate all outstanding operations */
+ mdsk_term_io(device);
+
+ /* figure out blocksize of device */
+ label = (long *) get_zeroed_page(GFP_KERNEL);
+ if (label == NULL) {
+ DEV_MESSAGE(KERN_WARNING, device, "%s",
+ "No memory to allocate initialization request");
+ return -ENOMEM;
+ }
+ /* try all sizes - needed for ECKD devices */
+ for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
+ mdsk_init_io(device, bsize, 0, 64);
+ memset(&bio, 0, sizeof (struct dasd_diag_bio));
+ bio.type = MDSK_READ_REQ;
+ bio.block_number = private->pt_block + 1;
+ bio.buffer = __pa(label);
+ memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
+ private->iob.dev_nr = rdc_data->dev_nr;
+ private->iob.key = 0;
+ private->iob.flags = 0; /* do synchronous io */
+ private->iob.block_count = 1;
+ private->iob.interrupt_params = 0;
+ private->iob.bio_list = __pa(&bio);
+ if (dia250(&private->iob, RW_BIO) == 0)
+ 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];
+ 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);
+ 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;
+}
+
+static int
+dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
+{
+ if (dasd_check_blocksize(device->bp_block) != 0)
+ return -EINVAL;
+ geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
+ geo->heads = 16;
+ geo->sectors = 128 >> device->s2b_shift;
+ return 0;
+}
+
+static dasd_era_t
+dasd_diag_examine_error(struct dasd_ccw_req * cqr, struct irb * stat)
+{
+ return dasd_era_fatal;
+}
+
+static dasd_erp_fn_t
+dasd_diag_erp_action(struct dasd_ccw_req * cqr)
+{
+ return dasd_default_erp_action;
+}
+
+static dasd_erp_fn_t
+dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
+{
+ return dasd_default_erp_postaction;
+}
+
+static struct dasd_ccw_req *
+dasd_diag_build_cp(struct dasd_device * device, struct request *req)
+{
+ struct dasd_ccw_req *cqr;
+ struct dasd_diag_req *dreq;
+ struct dasd_diag_bio *dbio;
+ struct bio *bio;
+ struct bio_vec *bv;
+ char *dst;
+ int count, datasize;
+ sector_t recid, first_rec, last_rec;
+ unsigned blksize, off;
+ unsigned char rw_cmd;
+ int i;
+
+ if (rq_data_dir(req) == READ)
+ rw_cmd = MDSK_READ_REQ;
+ else if (rq_data_dir(req) == WRITE)
+ rw_cmd = MDSK_WRITE_REQ;
+ else
+ return ERR_PTR(-EINVAL);
+ blksize = device->bp_block;
+ /* Calculate record id of first and last block. */
+ first_rec = req->sector >> device->s2b_shift;
+ last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
+ /* Check struct bio and count the number of blocks for the request. */
+ count = 0;
+ rq_for_each_bio(bio, req) {
+ bio_for_each_segment(bv, bio, i) {
+ if (bv->bv_len & (blksize - 1))
+ /* Fba can only do full blocks. */
+ return ERR_PTR(-EINVAL);
+ count += bv->bv_len >> (device->s2b_shift + 9);
+ }
+ }
+ /* Paranoia. */
+ if (count != last_rec - first_rec + 1)
+ return ERR_PTR(-EINVAL);
+ /* Build the request */
+ datasize = sizeof(struct dasd_diag_req) +
+ count*sizeof(struct dasd_diag_bio);
+ cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0,
+ datasize, device);
+ if (IS_ERR(cqr))
+ return cqr;
+
+ dreq = (struct dasd_diag_req *) cqr->data;
+ dreq->block_count = count;
+ dbio = dreq->bio;
+ recid = first_rec;
+ rq_for_each_bio(bio, req) {
+ bio_for_each_segment(bv, bio, i) {
+ dst = page_address(bv->bv_page) + bv->bv_offset;
+ for (off = 0; off < bv->bv_len; off += blksize) {
+ memset(dbio, 0, sizeof (struct dasd_diag_bio));
+ dbio->type = rw_cmd;
+ dbio->block_number = recid + 1;
+ dbio->buffer = __pa(dst);
+ dbio++;
+ dst += blksize;
+ recid++;
+ }
+ }
+ }
+ cqr->buildclk = get_clock();
+ cqr->device = device;
+ cqr->expires = 50 * HZ; /* 50 seconds */
+ cqr->status = DASD_CQR_FILLED;
+ return cqr;
+}
+
+static int
+dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
+{
+ int status;
+
+ status = cqr->status == DASD_CQR_DONE;
+ dasd_sfree_request(cqr, cqr->device);
+ return status;
+}
+
+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->FBA_layout = 1;
+ info->format = DASD_FORMAT_LDL;
+ info->characteristics_size = sizeof (struct dasd_diag_characteristics);
+ memcpy(info->characteristics,
+ &((struct dasd_diag_private *) device->private)->rdc_data,
+ sizeof (struct dasd_diag_characteristics));
+ info->confdata_size = 0;
+ return 0;
+}
+
+static void
+dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
+ struct irb *stat)
+{
+ DEV_MESSAGE(KERN_ERR, device, "%s",
+ "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,
+ .check_device = dasd_diag_check_device,
+ .fill_geometry = dasd_diag_fill_geometry,
+ .start_IO = dasd_start_diag,
+ .examine_error = dasd_diag_examine_error,
+ .erp_action = dasd_diag_erp_action,
+ .erp_postaction = dasd_diag_erp_postaction,
+ .build_cp = dasd_diag_build_cp,
+ .free_cp = dasd_diag_free_cp,
+ .dump_sense = dasd_diag_dump_sense,
+ .fill_info = dasd_diag_fill_info,
+};
+
+static int __init
+dasd_diag_init(void)
+{
+ if (!MACHINE_IS_VM) {
+ MESSAGE_LOG(KERN_INFO,
+ "Machine is not VM: %s "
+ "discipline not initializing",
+ dasd_diag_discipline.name);
+ return -EINVAL;
+ }
+ ASCEBC(dasd_diag_discipline.ebcname, 4);
+
+ ctl_set_bit(0, 9);
+ register_external_interrupt(0x2603, dasd_ext_handler);
+ dasd_diag_discipline_pointer = &dasd_diag_discipline;
+ return 0;
+}
+
+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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