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Diffstat (limited to 'drivers/s390/block/dasd_fba.c')
-rw-r--r--drivers/s390/block/dasd_fba.c607
1 files changed, 607 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
new file mode 100644
index 00000000000..7963ae343ee
--- /dev/null
+++ b/drivers/s390/block/dasd_fba.c
@@ -0,0 +1,607 @@
+/*
+ * File...........: linux/drivers/s390/block/dasd_fba.c
+ * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
+ *
+ * $Revision: 1.39 $
+ */
+
+#include <linux/config.h>
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <asm/debug.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/idals.h>
+#include <asm/ebcdic.h>
+#include <asm/io.h>
+#include <asm/todclk.h>
+#include <asm/ccwdev.h>
+
+#include "dasd_int.h"
+#include "dasd_fba.h"
+
+#ifdef PRINTK_HEADER
+#undef PRINTK_HEADER
+#endif /* PRINTK_HEADER */
+#define PRINTK_HEADER "dasd(fba):"
+
+#define DASD_FBA_CCW_WRITE 0x41
+#define DASD_FBA_CCW_READ 0x42
+#define DASD_FBA_CCW_LOCATE 0x43
+#define DASD_FBA_CCW_DEFINE_EXTENT 0x63
+
+MODULE_LICENSE("GPL");
+
+static struct dasd_discipline dasd_fba_discipline;
+
+struct dasd_fba_private {
+ struct dasd_fba_characteristics rdc_data;
+};
+
+static struct ccw_device_id dasd_fba_ids[] = {
+ { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), driver_info: 0x1},
+ { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), driver_info: 0x2},
+ { /* end of list */ },
+};
+
+MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
+
+static struct ccw_driver dasd_fba_driver; /* see below */
+static int
+dasd_fba_probe(struct ccw_device *cdev)
+{
+ int ret;
+
+ ret = dasd_generic_probe (cdev, &dasd_fba_discipline);
+ if (ret)
+ return ret;
+ ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
+ return 0;
+}
+
+static int
+dasd_fba_set_online(struct ccw_device *cdev)
+{
+ return dasd_generic_set_online (cdev, &dasd_fba_discipline);
+}
+
+static struct ccw_driver dasd_fba_driver = {
+ .name = "dasd-fba",
+ .owner = THIS_MODULE,
+ .ids = dasd_fba_ids,
+ .probe = dasd_fba_probe,
+ .remove = dasd_generic_remove,
+ .set_offline = dasd_generic_set_offline,
+ .set_online = dasd_fba_set_online,
+ .notify = dasd_generic_notify,
+};
+
+static inline void
+define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
+ int blksize, int beg, int nr)
+{
+ ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
+ ccw->flags = 0;
+ ccw->count = 16;
+ ccw->cda = (__u32) __pa(data);
+ memset(data, 0, sizeof (struct DE_fba_data));
+ if (rw == WRITE)
+ (data->mask).perm = 0x0;
+ else if (rw == READ)
+ (data->mask).perm = 0x1;
+ else
+ data->mask.perm = 0x2;
+ data->blk_size = blksize;
+ data->ext_loc = beg;
+ data->ext_end = nr - 1;
+}
+
+static inline void
+locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
+ int block_nr, int block_ct)
+{
+ ccw->cmd_code = DASD_FBA_CCW_LOCATE;
+ ccw->flags = 0;
+ ccw->count = 8;
+ ccw->cda = (__u32) __pa(data);
+ memset(data, 0, sizeof (struct LO_fba_data));
+ if (rw == WRITE)
+ data->operation.cmd = 0x5;
+ else if (rw == READ)
+ data->operation.cmd = 0x6;
+ else
+ data->operation.cmd = 0x8;
+ data->blk_nr = block_nr;
+ data->blk_ct = block_ct;
+}
+
+static int
+dasd_fba_check_characteristics(struct dasd_device *device)
+{
+ struct dasd_fba_private *private;
+ struct ccw_device *cdev = device->cdev;
+ void *rdc_data;
+ int rc;
+
+ private = (struct dasd_fba_private *) device->private;
+ if (private == NULL) {
+ private = kmalloc(sizeof(struct dasd_fba_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);
+ rc = read_dev_chars(device->cdev, &rdc_data, 32);
+ if (rc) {
+ DEV_MESSAGE(KERN_WARNING, device,
+ "Read device characteristics returned error %d",
+ rc);
+ return rc;
+ }
+
+ DEV_MESSAGE(KERN_INFO, device,
+ "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
+ cdev->id.dev_type,
+ cdev->id.dev_model,
+ cdev->id.cu_type,
+ cdev->id.cu_model,
+ ((private->rdc_data.blk_bdsa *
+ (private->rdc_data.blk_size >> 9)) >> 11),
+ private->rdc_data.blk_size);
+ return 0;
+}
+
+static int
+dasd_fba_do_analysis(struct dasd_device *device)
+{
+ struct dasd_fba_private *private;
+ int sb, rc;
+
+ private = (struct dasd_fba_private *) device->private;
+ rc = dasd_check_blocksize(private->rdc_data.blk_size);
+ if (rc) {
+ DEV_MESSAGE(KERN_INFO, device, "unknown blocksize %d",
+ private->rdc_data.blk_size);
+ return rc;
+ }
+ device->blocks = private->rdc_data.blk_bdsa;
+ device->bp_block = private->rdc_data.blk_size;
+ device->s2b_shift = 0; /* bits to shift 512 to get a block */
+ for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
+ device->s2b_shift++;
+ return 0;
+}
+
+static int
+dasd_fba_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_fba_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
+{
+ struct dasd_device *device;
+ struct ccw_device *cdev;
+
+ device = (struct dasd_device *) cqr->device;
+ if (irb->scsw.cstat == 0x00 &&
+ irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
+ return dasd_era_none;
+
+ cdev = device->cdev;
+ switch (cdev->id.dev_type) {
+ case 0x3370:
+ return dasd_3370_erp_examine(cqr, irb);
+ case 0x9336:
+ return dasd_9336_erp_examine(cqr, irb);
+ default:
+ return dasd_era_recover;
+ }
+}
+
+static dasd_erp_fn_t
+dasd_fba_erp_action(struct dasd_ccw_req * cqr)
+{
+ return dasd_default_erp_action;
+}
+
+static dasd_erp_fn_t
+dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
+{
+ if (cqr->function == dasd_default_erp_action)
+ return dasd_default_erp_postaction;
+
+ DEV_MESSAGE(KERN_WARNING, cqr->device, "unknown ERP action %p",
+ cqr->function);
+ return NULL;
+}
+
+static struct dasd_ccw_req *
+dasd_fba_build_cp(struct dasd_device * device, struct request *req)
+{
+ struct dasd_fba_private *private;
+ unsigned long *idaws;
+ struct LO_fba_data *LO_data;
+ struct dasd_ccw_req *cqr;
+ struct ccw1 *ccw;
+ struct bio *bio;
+ struct bio_vec *bv;
+ char *dst;
+ int count, cidaw, cplength, datasize;
+ sector_t recid, first_rec, last_rec;
+ unsigned int blksize, off;
+ unsigned char cmd;
+ int i;
+
+ private = (struct dasd_fba_private *) device->private;
+ if (rq_data_dir(req) == READ) {
+ cmd = DASD_FBA_CCW_READ;
+ } else if (rq_data_dir(req) == WRITE) {
+ cmd = DASD_FBA_CCW_WRITE;
+ } 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;
+ cidaw = 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);
+#if defined(CONFIG_ARCH_S390X)
+ if (idal_is_needed (page_address(bv->bv_page),
+ bv->bv_len))
+ cidaw += bv->bv_len / blksize;
+#endif
+ }
+ }
+ /* Paranoia. */
+ if (count != last_rec - first_rec + 1)
+ return ERR_PTR(-EINVAL);
+ /* 1x define extent + 1x locate record + number of blocks */
+ cplength = 2 + count;
+ /* 1x define extent + 1x locate record */
+ datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
+ cidaw * sizeof(unsigned long);
+ /*
+ * Find out number of additional locate record ccws if the device
+ * can't do data chaining.
+ */
+ if (private->rdc_data.mode.bits.data_chain == 0) {
+ cplength += count - 1;
+ datasize += (count - 1)*sizeof(struct LO_fba_data);
+ }
+ /* Allocate the ccw request. */
+ cqr = dasd_smalloc_request(dasd_fba_discipline.name,
+ cplength, datasize, device);
+ if (IS_ERR(cqr))
+ return cqr;
+ ccw = cqr->cpaddr;
+ /* First ccw is define extent. */
+ define_extent(ccw++, cqr->data, rq_data_dir(req),
+ device->bp_block, req->sector, req->nr_sectors);
+ /* Build locate_record + read/write ccws. */
+ idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
+ LO_data = (struct LO_fba_data *) (idaws + cidaw);
+ /* Locate record for all blocks for smart devices. */
+ if (private->rdc_data.mode.bits.data_chain != 0) {
+ ccw[-1].flags |= CCW_FLAG_CC;
+ locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
+ }
+ 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;
+ if (dasd_page_cache) {
+ char *copy = kmem_cache_alloc(dasd_page_cache,
+ SLAB_DMA | __GFP_NOWARN);
+ if (copy && rq_data_dir(req) == WRITE)
+ memcpy(copy + bv->bv_offset, dst, bv->bv_len);
+ if (copy)
+ dst = copy + bv->bv_offset;
+ }
+ for (off = 0; off < bv->bv_len; off += blksize) {
+ /* Locate record for stupid devices. */
+ if (private->rdc_data.mode.bits.data_chain == 0) {
+ ccw[-1].flags |= CCW_FLAG_CC;
+ locate_record(ccw, LO_data++,
+ rq_data_dir(req),
+ recid - first_rec, 1);
+ ccw->flags = CCW_FLAG_CC;
+ ccw++;
+ } else {
+ if (recid > first_rec)
+ ccw[-1].flags |= CCW_FLAG_DC;
+ else
+ ccw[-1].flags |= CCW_FLAG_CC;
+ }
+ ccw->cmd_code = cmd;
+ ccw->count = device->bp_block;
+ if (idal_is_needed(dst, blksize)) {
+ ccw->cda = (__u32)(addr_t) idaws;
+ ccw->flags = CCW_FLAG_IDA;
+ idaws = idal_create_words(idaws, dst, blksize);
+ } else {
+ ccw->cda = (__u32)(addr_t) dst;
+ ccw->flags = 0;
+ }
+ ccw++;
+ dst += blksize;
+ recid++;
+ }
+ }
+ cqr->device = device;
+ cqr->expires = 5 * 60 * HZ; /* 5 minutes */
+ cqr->status = DASD_CQR_FILLED;
+ return cqr;
+}
+
+static int
+dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
+{
+ struct dasd_fba_private *private;
+ struct ccw1 *ccw;
+ struct bio *bio;
+ struct bio_vec *bv;
+ char *dst, *cda;
+ unsigned int blksize, off;
+ int i, status;
+
+ if (!dasd_page_cache)
+ goto out;
+ private = (struct dasd_fba_private *) cqr->device->private;
+ blksize = cqr->device->bp_block;
+ ccw = cqr->cpaddr;
+ /* Skip over define extent & locate record. */
+ ccw++;
+ if (private->rdc_data.mode.bits.data_chain != 0)
+ ccw++;
+ 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) {
+ /* Skip locate record. */
+ if (private->rdc_data.mode.bits.data_chain == 0)
+ ccw++;
+ if (dst) {
+ if (ccw->flags & CCW_FLAG_IDA)
+ cda = *((char **)((addr_t) ccw->cda));
+ else
+ cda = (char *)((addr_t) ccw->cda);
+ if (dst != cda) {
+ if (rq_data_dir(req) == READ)
+ memcpy(dst, cda, bv->bv_len);
+ kmem_cache_free(dasd_page_cache,
+ (void *)((addr_t)cda & PAGE_MASK));
+ }
+ dst = NULL;
+ }
+ ccw++;
+ }
+ }
+out:
+ status = cqr->status == DASD_CQR_DONE;
+ dasd_sfree_request(cqr, cqr->device);
+ return status;
+}
+
+static int
+dasd_fba_fill_info(struct dasd_device * device,
+ struct dasd_information2_t * info)
+{
+ info->label_block = 1;
+ info->FBA_layout = 1;
+ info->format = DASD_FORMAT_LDL;
+ info->characteristics_size = sizeof(struct dasd_fba_characteristics);
+ memcpy(info->characteristics,
+ &((struct dasd_fba_private *) device->private)->rdc_data,
+ sizeof (struct dasd_fba_characteristics));
+ info->confdata_size = 0;
+ return 0;
+}
+
+static void
+dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
+ struct irb *irb)
+{
+ char *page;
+ struct ccw1 *act, *end, *last;
+ int len, sl, sct, count;
+
+ page = (char *) get_zeroed_page(GFP_ATOMIC);
+ if (page == NULL) {
+ DEV_MESSAGE(KERN_ERR, device, " %s",
+ "No memory to dump sense data");
+ return;
+ }
+ len = sprintf(page, KERN_ERR PRINTK_HEADER
+ " I/O status report for device %s:\n",
+ device->cdev->dev.bus_id);
+ len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
+ irb->scsw.cstat, irb->scsw.dstat);
+ len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " device %s: Failing CCW: %p\n",
+ device->cdev->dev.bus_id,
+ (void *) (addr_t) irb->scsw.cpa);
+ if (irb->esw.esw0.erw.cons) {
+ for (sl = 0; sl < 4; sl++) {
+ len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " Sense(hex) %2d-%2d:",
+ (8 * sl), ((8 * sl) + 7));
+
+ for (sct = 0; sct < 8; sct++) {
+ len += sprintf(page + len, " %02x",
+ irb->ecw[8 * sl + sct]);
+ }
+ len += sprintf(page + len, "\n");
+ }
+ } else {
+ len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " SORRY - NO VALID SENSE AVAILABLE\n");
+ }
+ MESSAGE_LOG(KERN_ERR, "%s",
+ page + sizeof(KERN_ERR PRINTK_HEADER));
+
+ /* dump the Channel Program */
+ /* print first CCWs (maximum 8) */
+ act = req->cpaddr;
+ for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
+ end = min(act + 8, last);
+ len = sprintf(page, KERN_ERR PRINTK_HEADER
+ " Related CP in req: %p\n", req);
+ while (act <= end) {
+ len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " CCW %p: %08X %08X DAT:",
+ act, ((int *) act)[0], ((int *) act)[1]);
+ for (count = 0; count < 32 && count < act->count;
+ count += sizeof(int))
+ len += sprintf(page + len, " %08X",
+ ((int *) (addr_t) act->cda)
+ [(count>>2)]);
+ len += sprintf(page + len, "\n");
+ act++;
+ }
+ MESSAGE_LOG(KERN_ERR, "%s",
+ page + sizeof(KERN_ERR PRINTK_HEADER));
+
+
+ /* print failing CCW area */
+ len = 0;
+ if (act < ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
+ act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
+ len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
+ }
+ end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
+ while (act <= end) {
+ len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " CCW %p: %08X %08X DAT:",
+ act, ((int *) act)[0], ((int *) act)[1]);
+ for (count = 0; count < 32 && count < act->count;
+ count += sizeof(int))
+ len += sprintf(page + len, " %08X",
+ ((int *) (addr_t) act->cda)
+ [(count>>2)]);
+ len += sprintf(page + len, "\n");
+ act++;
+ }
+
+ /* print last CCWs */
+ if (act < last - 2) {
+ act = last - 2;
+ len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
+ }
+ while (act <= last) {
+ len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " CCW %p: %08X %08X DAT:",
+ act, ((int *) act)[0], ((int *) act)[1]);
+ for (count = 0; count < 32 && count < act->count;
+ count += sizeof(int))
+ len += sprintf(page + len, " %08X",
+ ((int *) (addr_t) act->cda)
+ [(count>>2)]);
+ len += sprintf(page + len, "\n");
+ act++;
+ }
+ if (len > 0)
+ MESSAGE_LOG(KERN_ERR, "%s",
+ page + sizeof(KERN_ERR PRINTK_HEADER));
+ free_page((unsigned long) page);
+}
+
+/*
+ * 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). For 64 bit one dasd_mchunkt_t structure has
+ * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
+ * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
+ * addition we have one define extent ccw + 16 bytes of data and a
+ * locate record ccw for each block (stupid devices!) + 16 bytes of data.
+ * That makes:
+ * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 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 100.1 blocks
+ * for one request. Give a little safety and the result is 96.
+ */
+static struct dasd_discipline dasd_fba_discipline = {
+ .owner = THIS_MODULE,
+ .name = "FBA ",
+ .ebcname = "FBA ",
+ .max_blocks = 96,
+ .check_device = dasd_fba_check_characteristics,
+ .do_analysis = dasd_fba_do_analysis,
+ .fill_geometry = dasd_fba_fill_geometry,
+ .start_IO = dasd_start_IO,
+ .term_IO = dasd_term_IO,
+ .examine_error = dasd_fba_examine_error,
+ .erp_action = dasd_fba_erp_action,
+ .erp_postaction = dasd_fba_erp_postaction,
+ .build_cp = dasd_fba_build_cp,
+ .free_cp = dasd_fba_free_cp,
+ .dump_sense = dasd_fba_dump_sense,
+ .fill_info = dasd_fba_fill_info,
+};
+
+static int __init
+dasd_fba_init(void)
+{
+ int ret;
+
+ ASCEBC(dasd_fba_discipline.ebcname, 4);
+
+ ret = ccw_driver_register(&dasd_fba_driver);
+ if (ret)
+ return ret;
+
+ dasd_generic_auto_online(&dasd_fba_driver);
+ return 0;
+}
+
+static void __exit
+dasd_fba_cleanup(void)
+{
+ ccw_driver_unregister(&dasd_fba_driver);
+}
+
+module_init(dasd_fba_init);
+module_exit(dasd_fba_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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