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, 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 00000000000000..7963ae343eef84
--- /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:
+ */