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path: root/drivers/s390/char/tape_34xx.c
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Diffstat (limited to 'drivers/s390/char/tape_34xx.c')
-rw-r--r--drivers/s390/char/tape_34xx.c226
1 files changed, 56 insertions, 170 deletions
diff --git a/drivers/s390/char/tape_34xx.c b/drivers/s390/char/tape_34xx.c
index 807ded5eb04..9aa79702b37 100644
--- a/drivers/s390/char/tape_34xx.c
+++ b/drivers/s390/char/tape_34xx.c
@@ -1,19 +1,20 @@
/*
- * drivers/s390/char/tape_34xx.c
* tape device discipline for 3480/3490 tapes.
*
- * Copyright (C) IBM Corp. 2001,2006
+ * Copyright IBM Corp. 2001, 2009
* Author(s): Carsten Otte <cotte@de.ibm.com>
* Tuan Ngo-Anh <ngoanh@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
-#define KMSG_COMPONENT "tape"
+#define KMSG_COMPONENT "tape_34xx"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bio.h>
#include <linux/workqueue.h>
+#include <linux/slab.h>
#define TAPE_DBF_AREA tape_34xx_dbf
@@ -51,23 +52,11 @@ static void tape_34xx_delete_sbid_from(struct tape_device *, int);
* Medium sense for 34xx tapes. There is no 'real' medium sense call.
* So we just do a normal sense.
*/
-static int
-tape_34xx_medium_sense(struct tape_device *device)
+static void __tape_34xx_medium_sense(struct tape_request *request)
{
- struct tape_request *request;
- unsigned char *sense;
- int rc;
-
- request = tape_alloc_request(1, 32);
- if (IS_ERR(request)) {
- DBF_EXCEPTION(6, "MSEN fail\n");
- return PTR_ERR(request);
- }
-
- request->op = TO_MSEN;
- tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata);
+ struct tape_device *device = request->device;
+ unsigned char *sense;
- rc = tape_do_io_interruptible(device, request);
if (request->rc == 0) {
sense = request->cpdata;
@@ -86,15 +75,47 @@ tape_34xx_medium_sense(struct tape_device *device)
device->tape_generic_status |= GMT_WR_PROT(~0);
else
device->tape_generic_status &= ~GMT_WR_PROT(~0);
- } else {
+ } else
DBF_EVENT(4, "tape_34xx: medium sense failed with rc=%d\n",
request->rc);
- }
tape_free_request(request);
+}
+
+static int tape_34xx_medium_sense(struct tape_device *device)
+{
+ struct tape_request *request;
+ int rc;
+ request = tape_alloc_request(1, 32);
+ if (IS_ERR(request)) {
+ DBF_EXCEPTION(6, "MSEN fail\n");
+ return PTR_ERR(request);
+ }
+
+ request->op = TO_MSEN;
+ tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata);
+ rc = tape_do_io_interruptible(device, request);
+ __tape_34xx_medium_sense(request);
return rc;
}
+static void tape_34xx_medium_sense_async(struct tape_device *device)
+{
+ struct tape_request *request;
+
+ request = tape_alloc_request(1, 32);
+ if (IS_ERR(request)) {
+ DBF_EXCEPTION(6, "MSEN fail\n");
+ return;
+ }
+
+ request->op = TO_MSEN;
+ tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata);
+ request->callback = (void *) __tape_34xx_medium_sense;
+ request->callback_data = NULL;
+ tape_do_io_async(device, request);
+}
+
struct tape_34xx_work {
struct tape_device *device;
enum tape_op op;
@@ -107,22 +128,25 @@ struct tape_34xx_work {
* is inserted but cannot call tape_do_io* from an interrupt context.
* Maybe that's useful for other actions we want to start from the
* interrupt handler.
+ * Note: the work handler is called by the system work queue. The tape
+ * commands started by the handler need to be asynchrounous, otherwise
+ * a deadlock can occur e.g. in case of a deferred cc=1 (see __tape_do_irq).
*/
static void
tape_34xx_work_handler(struct work_struct *work)
{
struct tape_34xx_work *p =
container_of(work, struct tape_34xx_work, work);
+ struct tape_device *device = p->device;
switch(p->op) {
case TO_MSEN:
- tape_34xx_medium_sense(p->device);
+ tape_34xx_medium_sense_async(device);
break;
default:
DBF_EVENT(3, "T34XX: internal error: unknown work\n");
}
-
- p->device = tape_put_device(p->device);
+ tape_put_device(device);
kfree(p);
}
@@ -136,7 +160,7 @@ tape_34xx_schedule_work(struct tape_device *device, enum tape_op op)
INIT_WORK(&p->work, tape_34xx_work_handler);
- p->device = tape_get_device_reference(device);
+ p->device = tape_get_device(device);
p->op = op;
schedule_work(&p->work);
@@ -298,20 +322,6 @@ tape_34xx_unit_check(struct tape_device *device, struct tape_request *request,
inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0;
sense = irb->ecw;
-#ifdef CONFIG_S390_TAPE_BLOCK
- if (request->op == TO_BLOCK) {
- /*
- * Recovery for block device requests. Set the block_position
- * to something invalid and retry.
- */
- device->blk_data.block_position = -1;
- if (request->retries-- <= 0)
- return tape_34xx_erp_failed(request, -EIO);
- else
- return tape_34xx_erp_retry(request);
- }
-#endif
-
if (
sense[0] & SENSE_COMMAND_REJECT &&
sense[1] & SENSE_WRITE_PROTECT
@@ -1104,123 +1114,6 @@ tape_34xx_mtseek(struct tape_device *device, int mt_count)
return tape_do_io_free(device, request);
}
-#ifdef CONFIG_S390_TAPE_BLOCK
-/*
- * Tape block read for 34xx.
- */
-static struct tape_request *
-tape_34xx_bread(struct tape_device *device, struct request *req)
-{
- struct tape_request *request;
- struct ccw1 *ccw;
- int count = 0;
- unsigned off;
- char *dst;
- struct bio_vec *bv;
- struct req_iterator iter;
- struct tape_34xx_block_id * start_block;
-
- DBF_EVENT(6, "xBREDid:");
-
- /* Count the number of blocks for the request. */
- rq_for_each_segment(bv, req, iter)
- count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9);
-
- /* Allocate the ccw request. */
- request = tape_alloc_request(3+count+1, 8);
- if (IS_ERR(request))
- return request;
-
- /* Setup ccws. */
- request->op = TO_BLOCK;
- start_block = (struct tape_34xx_block_id *) request->cpdata;
- start_block->block = req->sector >> TAPEBLOCK_HSEC_S2B;
- DBF_EVENT(6, "start_block = %i\n", start_block->block);
-
- ccw = request->cpaddr;
- ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte);
-
- /*
- * We always setup a nop after the mode set ccw. This slot is
- * used in tape_std_check_locate to insert a locate ccw if the
- * current tape position doesn't match the start block to be read.
- * The second nop will be filled with a read block id which is in
- * turn used by tape_34xx_free_bread to populate the segment bid
- * table.
- */
- ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
- ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
-
- rq_for_each_segment(bv, req, iter) {
- dst = kmap(bv->bv_page) + bv->bv_offset;
- for (off = 0; off < bv->bv_len; off += TAPEBLOCK_HSEC_SIZE) {
- ccw->flags = CCW_FLAG_CC;
- ccw->cmd_code = READ_FORWARD;
- ccw->count = TAPEBLOCK_HSEC_SIZE;
- set_normalized_cda(ccw, (void*) __pa(dst));
- ccw++;
- dst += TAPEBLOCK_HSEC_SIZE;
- }
- }
-
- ccw = tape_ccw_end(ccw, NOP, 0, NULL);
- DBF_EVENT(6, "xBREDccwg\n");
- return request;
-}
-
-static void
-tape_34xx_free_bread (struct tape_request *request)
-{
- struct ccw1* ccw;
-
- ccw = request->cpaddr;
- if ((ccw + 2)->cmd_code == READ_BLOCK_ID) {
- struct {
- struct tape_34xx_block_id cbid;
- struct tape_34xx_block_id dbid;
- } __attribute__ ((packed)) *rbi_data;
-
- rbi_data = request->cpdata;
-
- if (request->device)
- tape_34xx_add_sbid(request->device, rbi_data->cbid);
- }
-
- /* Last ccw is a nop and doesn't need clear_normalized_cda */
- for (; ccw->flags & CCW_FLAG_CC; ccw++)
- if (ccw->cmd_code == READ_FORWARD)
- clear_normalized_cda(ccw);
- tape_free_request(request);
-}
-
-/*
- * check_locate is called just before the tape request is passed to
- * the common io layer for execution. It has to check the current
- * tape position and insert a locate ccw if it doesn't match the
- * start block for the request.
- */
-static void
-tape_34xx_check_locate(struct tape_device *device, struct tape_request *request)
-{
- struct tape_34xx_block_id * start_block;
-
- start_block = (struct tape_34xx_block_id *) request->cpdata;
- if (start_block->block == device->blk_data.block_position)
- return;
-
- DBF_LH(4, "Block seek(%06d+%06d)\n", start_block->block, device->bof);
- start_block->wrap = 0;
- start_block->segment = 1;
- start_block->format = (*device->modeset_byte & 0x08) ?
- TAPE34XX_FMT_3480_XF :
- TAPE34XX_FMT_3480;
- start_block->block = start_block->block + device->bof;
- tape_34xx_merge_sbid(device, start_block);
- tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
- tape_ccw_cc(request->cpaddr + 2, READ_BLOCK_ID, 8, request->cpdata);
-}
-#endif
-
/*
* List of 3480/3490 magnetic tape commands.
*/
@@ -1270,11 +1163,6 @@ static struct tape_discipline tape_discipline_34xx = {
.irq = tape_34xx_irq,
.read_block = tape_std_read_block,
.write_block = tape_std_write_block,
-#ifdef CONFIG_S390_TAPE_BLOCK
- .bread = tape_34xx_bread,
- .free_bread = tape_34xx_free_bread,
- .check_locate = tape_34xx_check_locate,
-#endif
.ioctl_fn = tape_34xx_ioctl,
.mtop_array = tape_34xx_mtop
};
@@ -1289,25 +1177,23 @@ static int
tape_34xx_online(struct ccw_device *cdev)
{
return tape_generic_online(
- cdev->dev.driver_data,
+ dev_get_drvdata(&cdev->dev),
&tape_discipline_34xx
);
}
-static int
-tape_34xx_offline(struct ccw_device *cdev)
-{
- return tape_generic_offline(cdev->dev.driver_data);
-}
-
static struct ccw_driver tape_34xx_driver = {
- .name = "tape_34xx",
- .owner = THIS_MODULE,
+ .driver = {
+ .name = "tape_34xx",
+ .owner = THIS_MODULE,
+ },
.ids = tape_34xx_ids,
.probe = tape_generic_probe,
.remove = tape_generic_remove,
.set_online = tape_34xx_online,
- .set_offline = tape_34xx_offline,
+ .set_offline = tape_generic_offline,
+ .freeze = tape_generic_pm_suspend,
+ .int_class = IRQIO_TAP,
};
static int
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-12 06:07:17 +0000