![Heiko Carstens](/assets/img/avatar_default.png)
Commit a035d552a9
("Makefile: Globally enable fall-through warning")
enables fall-through warnings globally. Add missing annotations.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
1378 lines
34 KiB
C
1378 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* basic function of the tape device driver
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*
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* S390 and zSeries version
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* Copyright IBM Corp. 2001, 2009
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* Author(s): Carsten Otte <cotte@de.ibm.com>
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* Michael Holzheu <holzheu@de.ibm.com>
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* Tuan Ngo-Anh <ngoanh@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Stefan Bader <shbader@de.ibm.com>
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*/
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#define KMSG_COMPONENT "tape"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/init.h> // for kernel parameters
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#include <linux/kmod.h> // for requesting modules
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#include <linux/spinlock.h> // for locks
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#include <linux/vmalloc.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <asm/types.h> // for variable types
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#define TAPE_DBF_AREA tape_core_dbf
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#include "tape.h"
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#include "tape_std.h"
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#define LONG_BUSY_TIMEOUT 180 /* seconds */
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static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *);
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static void tape_delayed_next_request(struct work_struct *);
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static void tape_long_busy_timeout(struct timer_list *t);
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/*
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* One list to contain all tape devices of all disciplines, so
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* we can assign the devices to minor numbers of the same major
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* The list is protected by the rwlock
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*/
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static LIST_HEAD(tape_device_list);
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static DEFINE_RWLOCK(tape_device_lock);
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/*
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* Pointer to debug area.
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*/
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debug_info_t *TAPE_DBF_AREA = NULL;
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EXPORT_SYMBOL(TAPE_DBF_AREA);
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/*
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* Printable strings for tape enumerations.
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*/
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const char *tape_state_verbose[TS_SIZE] =
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{
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[TS_UNUSED] = "UNUSED",
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[TS_IN_USE] = "IN_USE",
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[TS_BLKUSE] = "BLKUSE",
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[TS_INIT] = "INIT ",
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[TS_NOT_OPER] = "NOT_OP"
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};
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const char *tape_op_verbose[TO_SIZE] =
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{
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[TO_BLOCK] = "BLK", [TO_BSB] = "BSB",
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[TO_BSF] = "BSF", [TO_DSE] = "DSE",
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[TO_FSB] = "FSB", [TO_FSF] = "FSF",
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[TO_LBL] = "LBL", [TO_NOP] = "NOP",
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[TO_RBA] = "RBA", [TO_RBI] = "RBI",
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[TO_RFO] = "RFO", [TO_REW] = "REW",
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[TO_RUN] = "RUN", [TO_WRI] = "WRI",
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[TO_WTM] = "WTM", [TO_MSEN] = "MSN",
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[TO_LOAD] = "LOA", [TO_READ_CONFIG] = "RCF",
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[TO_READ_ATTMSG] = "RAT",
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[TO_DIS] = "DIS", [TO_ASSIGN] = "ASS",
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[TO_UNASSIGN] = "UAS", [TO_CRYPT_ON] = "CON",
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[TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS",
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[TO_KEKL_QUERY] = "KLQ",[TO_RDC] = "RDC",
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};
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static int devid_to_int(struct ccw_dev_id *dev_id)
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{
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return dev_id->devno + (dev_id->ssid << 16);
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}
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/*
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* Some channel attached tape specific attributes.
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*
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* FIXME: In the future the first_minor and blocksize attribute should be
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* replaced by a link to the cdev tree.
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*/
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static ssize_t
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tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct tape_device *tdev;
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tdev = dev_get_drvdata(dev);
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return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->medium_state);
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}
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static
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DEVICE_ATTR(medium_state, 0444, tape_medium_state_show, NULL);
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static ssize_t
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tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct tape_device *tdev;
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tdev = dev_get_drvdata(dev);
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return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->first_minor);
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}
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static
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DEVICE_ATTR(first_minor, 0444, tape_first_minor_show, NULL);
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static ssize_t
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tape_state_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct tape_device *tdev;
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tdev = dev_get_drvdata(dev);
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return scnprintf(buf, PAGE_SIZE, "%s\n", (tdev->first_minor < 0) ?
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"OFFLINE" : tape_state_verbose[tdev->tape_state]);
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}
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static
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DEVICE_ATTR(state, 0444, tape_state_show, NULL);
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static ssize_t
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tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct tape_device *tdev;
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ssize_t rc;
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tdev = dev_get_drvdata(dev);
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if (tdev->first_minor < 0)
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return scnprintf(buf, PAGE_SIZE, "N/A\n");
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spin_lock_irq(get_ccwdev_lock(tdev->cdev));
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if (list_empty(&tdev->req_queue))
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rc = scnprintf(buf, PAGE_SIZE, "---\n");
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else {
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struct tape_request *req;
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req = list_entry(tdev->req_queue.next, struct tape_request,
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list);
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rc = scnprintf(buf,PAGE_SIZE, "%s\n", tape_op_verbose[req->op]);
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}
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spin_unlock_irq(get_ccwdev_lock(tdev->cdev));
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return rc;
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}
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static
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DEVICE_ATTR(operation, 0444, tape_operation_show, NULL);
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static ssize_t
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tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct tape_device *tdev;
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tdev = dev_get_drvdata(dev);
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return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->char_data.block_size);
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}
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static
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DEVICE_ATTR(blocksize, 0444, tape_blocksize_show, NULL);
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static struct attribute *tape_attrs[] = {
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&dev_attr_medium_state.attr,
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&dev_attr_first_minor.attr,
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&dev_attr_state.attr,
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&dev_attr_operation.attr,
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&dev_attr_blocksize.attr,
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NULL
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};
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static const struct attribute_group tape_attr_group = {
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.attrs = tape_attrs,
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};
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/*
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* Tape state functions
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*/
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void
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tape_state_set(struct tape_device *device, enum tape_state newstate)
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{
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const char *str;
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if (device->tape_state == TS_NOT_OPER) {
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DBF_EVENT(3, "ts_set err: not oper\n");
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return;
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}
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DBF_EVENT(4, "ts. dev: %x\n", device->first_minor);
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DBF_EVENT(4, "old ts:\t\n");
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if (device->tape_state < TS_SIZE && device->tape_state >=0 )
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str = tape_state_verbose[device->tape_state];
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else
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str = "UNKNOWN TS";
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DBF_EVENT(4, "%s\n", str);
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DBF_EVENT(4, "new ts:\t\n");
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if (newstate < TS_SIZE && newstate >= 0)
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str = tape_state_verbose[newstate];
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else
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str = "UNKNOWN TS";
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DBF_EVENT(4, "%s\n", str);
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device->tape_state = newstate;
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wake_up(&device->state_change_wq);
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}
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struct tape_med_state_work_data {
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struct tape_device *device;
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enum tape_medium_state state;
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struct work_struct work;
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};
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static void
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tape_med_state_work_handler(struct work_struct *work)
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{
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static char env_state_loaded[] = "MEDIUM_STATE=LOADED";
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static char env_state_unloaded[] = "MEDIUM_STATE=UNLOADED";
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struct tape_med_state_work_data *p =
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container_of(work, struct tape_med_state_work_data, work);
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struct tape_device *device = p->device;
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char *envp[] = { NULL, NULL };
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switch (p->state) {
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case MS_UNLOADED:
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pr_info("%s: The tape cartridge has been successfully "
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"unloaded\n", dev_name(&device->cdev->dev));
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envp[0] = env_state_unloaded;
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kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp);
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break;
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case MS_LOADED:
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pr_info("%s: A tape cartridge has been mounted\n",
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dev_name(&device->cdev->dev));
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envp[0] = env_state_loaded;
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kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp);
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break;
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default:
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break;
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}
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tape_put_device(device);
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kfree(p);
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}
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static void
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tape_med_state_work(struct tape_device *device, enum tape_medium_state state)
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{
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struct tape_med_state_work_data *p;
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p = kzalloc(sizeof(*p), GFP_ATOMIC);
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if (p) {
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INIT_WORK(&p->work, tape_med_state_work_handler);
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p->device = tape_get_device(device);
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p->state = state;
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schedule_work(&p->work);
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}
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}
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void
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tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate)
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{
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enum tape_medium_state oldstate;
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oldstate = device->medium_state;
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if (oldstate == newstate)
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return;
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device->medium_state = newstate;
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switch(newstate){
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case MS_UNLOADED:
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device->tape_generic_status |= GMT_DR_OPEN(~0);
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if (oldstate == MS_LOADED)
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tape_med_state_work(device, MS_UNLOADED);
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break;
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case MS_LOADED:
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device->tape_generic_status &= ~GMT_DR_OPEN(~0);
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if (oldstate == MS_UNLOADED)
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tape_med_state_work(device, MS_LOADED);
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break;
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default:
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break;
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}
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wake_up(&device->state_change_wq);
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}
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/*
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* Stop running ccw. Has to be called with the device lock held.
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*/
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static int
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__tape_cancel_io(struct tape_device *device, struct tape_request *request)
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{
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int retries;
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int rc;
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/* Check if interrupt has already been processed */
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if (request->callback == NULL)
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return 0;
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rc = 0;
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for (retries = 0; retries < 5; retries++) {
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rc = ccw_device_clear(device->cdev, (long) request);
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switch (rc) {
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case 0:
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request->status = TAPE_REQUEST_DONE;
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return 0;
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case -EBUSY:
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request->status = TAPE_REQUEST_CANCEL;
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schedule_delayed_work(&device->tape_dnr, 0);
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return 0;
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case -ENODEV:
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DBF_EXCEPTION(2, "device gone, retry\n");
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break;
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case -EIO:
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DBF_EXCEPTION(2, "I/O error, retry\n");
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break;
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default:
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BUG();
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}
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}
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return rc;
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}
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/*
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* Add device into the sorted list, giving it the first
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* available minor number.
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*/
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static int
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tape_assign_minor(struct tape_device *device)
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{
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struct tape_device *tmp;
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int minor;
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minor = 0;
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write_lock(&tape_device_lock);
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list_for_each_entry(tmp, &tape_device_list, node) {
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if (minor < tmp->first_minor)
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break;
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minor += TAPE_MINORS_PER_DEV;
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}
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if (minor >= 256) {
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write_unlock(&tape_device_lock);
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return -ENODEV;
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}
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device->first_minor = minor;
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list_add_tail(&device->node, &tmp->node);
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write_unlock(&tape_device_lock);
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return 0;
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}
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/* remove device from the list */
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static void
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tape_remove_minor(struct tape_device *device)
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{
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write_lock(&tape_device_lock);
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list_del_init(&device->node);
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device->first_minor = -1;
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write_unlock(&tape_device_lock);
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}
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/*
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* Set a device online.
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*
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* This function is called by the common I/O layer to move a device from the
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* detected but offline into the online state.
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* If we return an error (RC < 0) the device remains in the offline state. This
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* can happen if the device is assigned somewhere else, for example.
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*/
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int
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tape_generic_online(struct tape_device *device,
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struct tape_discipline *discipline)
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{
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int rc;
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DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline);
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if (device->tape_state != TS_INIT) {
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DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state);
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return -EINVAL;
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}
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timer_setup(&device->lb_timeout, tape_long_busy_timeout, 0);
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/* Let the discipline have a go at the device. */
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device->discipline = discipline;
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if (!try_module_get(discipline->owner)) {
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return -EINVAL;
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}
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rc = discipline->setup_device(device);
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if (rc)
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goto out;
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rc = tape_assign_minor(device);
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if (rc)
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goto out_discipline;
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rc = tapechar_setup_device(device);
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if (rc)
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goto out_minor;
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tape_state_set(device, TS_UNUSED);
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DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id);
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return 0;
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out_minor:
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tape_remove_minor(device);
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out_discipline:
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device->discipline->cleanup_device(device);
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device->discipline = NULL;
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out:
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module_put(discipline->owner);
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return rc;
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}
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static void
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tape_cleanup_device(struct tape_device *device)
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{
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tapechar_cleanup_device(device);
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device->discipline->cleanup_device(device);
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module_put(device->discipline->owner);
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tape_remove_minor(device);
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tape_med_state_set(device, MS_UNKNOWN);
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}
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/*
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* Suspend device.
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*
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* Called by the common I/O layer if the drive should be suspended on user
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* request. We refuse to suspend if the device is loaded or in use for the
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* following reason:
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* While the Linux guest is suspended, it might be logged off which causes
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* devices to be detached. Tape devices are automatically rewound and unloaded
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* during DETACH processing (unless the tape device was attached with the
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* NOASSIGN or MULTIUSER option). After rewind/unload, there is no way to
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* resume the original state of the tape device, since we would need to
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* manually re-load the cartridge which was active at suspend time.
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*/
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int tape_generic_pm_suspend(struct ccw_device *cdev)
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{
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struct tape_device *device;
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device = dev_get_drvdata(&cdev->dev);
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if (!device) {
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return -ENODEV;
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}
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DBF_LH(3, "(%08x): tape_generic_pm_suspend(%p)\n",
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device->cdev_id, device);
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if (device->medium_state != MS_UNLOADED) {
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pr_err("A cartridge is loaded in tape device %s, "
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"refusing to suspend\n", dev_name(&cdev->dev));
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return -EBUSY;
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}
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spin_lock_irq(get_ccwdev_lock(device->cdev));
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switch (device->tape_state) {
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case TS_INIT:
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case TS_NOT_OPER:
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case TS_UNUSED:
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spin_unlock_irq(get_ccwdev_lock(device->cdev));
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break;
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default:
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pr_err("Tape device %s is busy, refusing to "
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"suspend\n", dev_name(&cdev->dev));
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spin_unlock_irq(get_ccwdev_lock(device->cdev));
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return -EBUSY;
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}
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DBF_LH(3, "(%08x): Drive suspended.\n", device->cdev_id);
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return 0;
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}
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/*
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* Set device offline.
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*
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* Called by the common I/O layer if the drive should set offline on user
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* request. We may prevent this by returning an error.
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* Manual offline is only allowed while the drive is not in use.
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*/
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int
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tape_generic_offline(struct ccw_device *cdev)
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{
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struct tape_device *device;
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device = dev_get_drvdata(&cdev->dev);
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if (!device) {
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return -ENODEV;
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}
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DBF_LH(3, "(%08x): tape_generic_offline(%p)\n",
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device->cdev_id, device);
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spin_lock_irq(get_ccwdev_lock(device->cdev));
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switch (device->tape_state) {
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case TS_INIT:
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case TS_NOT_OPER:
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spin_unlock_irq(get_ccwdev_lock(device->cdev));
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break;
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case TS_UNUSED:
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tape_state_set(device, TS_INIT);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
tape_cleanup_device(device);
|
|
break;
|
|
default:
|
|
DBF_EVENT(3, "(%08x): Set offline failed "
|
|
"- drive in use.\n",
|
|
device->cdev_id);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
return -EBUSY;
|
|
}
|
|
|
|
DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate memory for a new device structure.
|
|
*/
|
|
static struct tape_device *
|
|
tape_alloc_device(void)
|
|
{
|
|
struct tape_device *device;
|
|
|
|
device = kzalloc(sizeof(struct tape_device), GFP_KERNEL);
|
|
if (device == NULL) {
|
|
DBF_EXCEPTION(2, "ti:no mem\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA);
|
|
if (device->modeset_byte == NULL) {
|
|
DBF_EXCEPTION(2, "ti:no mem\n");
|
|
kfree(device);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
mutex_init(&device->mutex);
|
|
INIT_LIST_HEAD(&device->req_queue);
|
|
INIT_LIST_HEAD(&device->node);
|
|
init_waitqueue_head(&device->state_change_wq);
|
|
init_waitqueue_head(&device->wait_queue);
|
|
device->tape_state = TS_INIT;
|
|
device->medium_state = MS_UNKNOWN;
|
|
*device->modeset_byte = 0;
|
|
device->first_minor = -1;
|
|
atomic_set(&device->ref_count, 1);
|
|
INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request);
|
|
|
|
return device;
|
|
}
|
|
|
|
/*
|
|
* Get a reference to an existing device structure. This will automatically
|
|
* increment the reference count.
|
|
*/
|
|
struct tape_device *
|
|
tape_get_device(struct tape_device *device)
|
|
{
|
|
int count;
|
|
|
|
count = atomic_inc_return(&device->ref_count);
|
|
DBF_EVENT(4, "tape_get_device(%p) = %i\n", device, count);
|
|
return device;
|
|
}
|
|
|
|
/*
|
|
* Decrease the reference counter of a devices structure. If the
|
|
* reference counter reaches zero free the device structure.
|
|
* The function returns a NULL pointer to be used by the caller
|
|
* for clearing reference pointers.
|
|
*/
|
|
void
|
|
tape_put_device(struct tape_device *device)
|
|
{
|
|
int count;
|
|
|
|
count = atomic_dec_return(&device->ref_count);
|
|
DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, count);
|
|
BUG_ON(count < 0);
|
|
if (count == 0) {
|
|
kfree(device->modeset_byte);
|
|
kfree(device);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find tape device by a device index.
|
|
*/
|
|
struct tape_device *
|
|
tape_find_device(int devindex)
|
|
{
|
|
struct tape_device *device, *tmp;
|
|
|
|
device = ERR_PTR(-ENODEV);
|
|
read_lock(&tape_device_lock);
|
|
list_for_each_entry(tmp, &tape_device_list, node) {
|
|
if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) {
|
|
device = tape_get_device(tmp);
|
|
break;
|
|
}
|
|
}
|
|
read_unlock(&tape_device_lock);
|
|
return device;
|
|
}
|
|
|
|
/*
|
|
* Driverfs tape probe function.
|
|
*/
|
|
int
|
|
tape_generic_probe(struct ccw_device *cdev)
|
|
{
|
|
struct tape_device *device;
|
|
int ret;
|
|
struct ccw_dev_id dev_id;
|
|
|
|
device = tape_alloc_device();
|
|
if (IS_ERR(device))
|
|
return -ENODEV;
|
|
ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP |
|
|
CCWDEV_DO_MULTIPATH);
|
|
ret = sysfs_create_group(&cdev->dev.kobj, &tape_attr_group);
|
|
if (ret) {
|
|
tape_put_device(device);
|
|
return ret;
|
|
}
|
|
dev_set_drvdata(&cdev->dev, device);
|
|
cdev->handler = __tape_do_irq;
|
|
device->cdev = cdev;
|
|
ccw_device_get_id(cdev, &dev_id);
|
|
device->cdev_id = devid_to_int(&dev_id);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
__tape_discard_requests(struct tape_device *device)
|
|
{
|
|
struct tape_request * request;
|
|
struct list_head * l, *n;
|
|
|
|
list_for_each_safe(l, n, &device->req_queue) {
|
|
request = list_entry(l, struct tape_request, list);
|
|
if (request->status == TAPE_REQUEST_IN_IO)
|
|
request->status = TAPE_REQUEST_DONE;
|
|
list_del(&request->list);
|
|
|
|
/* Decrease ref_count for removed request. */
|
|
request->device = NULL;
|
|
tape_put_device(device);
|
|
request->rc = -EIO;
|
|
if (request->callback != NULL)
|
|
request->callback(request, request->callback_data);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Driverfs tape remove function.
|
|
*
|
|
* This function is called whenever the common I/O layer detects the device
|
|
* gone. This can happen at any time and we cannot refuse.
|
|
*/
|
|
void
|
|
tape_generic_remove(struct ccw_device *cdev)
|
|
{
|
|
struct tape_device * device;
|
|
|
|
device = dev_get_drvdata(&cdev->dev);
|
|
if (!device) {
|
|
return;
|
|
}
|
|
DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev);
|
|
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
switch (device->tape_state) {
|
|
case TS_INIT:
|
|
tape_state_set(device, TS_NOT_OPER);
|
|
/* fallthrough */
|
|
case TS_NOT_OPER:
|
|
/*
|
|
* Nothing to do.
|
|
*/
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
break;
|
|
case TS_UNUSED:
|
|
/*
|
|
* Need only to release the device.
|
|
*/
|
|
tape_state_set(device, TS_NOT_OPER);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
tape_cleanup_device(device);
|
|
break;
|
|
default:
|
|
/*
|
|
* There may be requests on the queue. We will not get
|
|
* an interrupt for a request that was running. So we
|
|
* just post them all as I/O errors.
|
|
*/
|
|
DBF_EVENT(3, "(%08x): Drive in use vanished!\n",
|
|
device->cdev_id);
|
|
pr_warn("%s: A tape unit was detached while in use\n",
|
|
dev_name(&device->cdev->dev));
|
|
tape_state_set(device, TS_NOT_OPER);
|
|
__tape_discard_requests(device);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
tape_cleanup_device(device);
|
|
}
|
|
|
|
device = dev_get_drvdata(&cdev->dev);
|
|
if (device) {
|
|
sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group);
|
|
dev_set_drvdata(&cdev->dev, NULL);
|
|
tape_put_device(device);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allocate a new tape ccw request
|
|
*/
|
|
struct tape_request *
|
|
tape_alloc_request(int cplength, int datasize)
|
|
{
|
|
struct tape_request *request;
|
|
|
|
BUG_ON(datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
|
|
|
|
DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize);
|
|
|
|
request = kzalloc(sizeof(struct tape_request), GFP_KERNEL);
|
|
if (request == NULL) {
|
|
DBF_EXCEPTION(1, "cqra nomem\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
/* allocate channel program */
|
|
if (cplength > 0) {
|
|
request->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
|
|
GFP_ATOMIC | GFP_DMA);
|
|
if (request->cpaddr == NULL) {
|
|
DBF_EXCEPTION(1, "cqra nomem\n");
|
|
kfree(request);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
}
|
|
/* alloc small kernel buffer */
|
|
if (datasize > 0) {
|
|
request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA);
|
|
if (request->cpdata == NULL) {
|
|
DBF_EXCEPTION(1, "cqra nomem\n");
|
|
kfree(request->cpaddr);
|
|
kfree(request);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
}
|
|
DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr,
|
|
request->cpdata);
|
|
|
|
return request;
|
|
}
|
|
|
|
/*
|
|
* Free tape ccw request
|
|
*/
|
|
void
|
|
tape_free_request (struct tape_request * request)
|
|
{
|
|
DBF_LH(6, "Free request %p\n", request);
|
|
|
|
if (request->device)
|
|
tape_put_device(request->device);
|
|
kfree(request->cpdata);
|
|
kfree(request->cpaddr);
|
|
kfree(request);
|
|
}
|
|
|
|
static int
|
|
__tape_start_io(struct tape_device *device, struct tape_request *request)
|
|
{
|
|
int rc;
|
|
|
|
rc = ccw_device_start(
|
|
device->cdev,
|
|
request->cpaddr,
|
|
(unsigned long) request,
|
|
0x00,
|
|
request->options
|
|
);
|
|
if (rc == 0) {
|
|
request->status = TAPE_REQUEST_IN_IO;
|
|
} else if (rc == -EBUSY) {
|
|
/* The common I/O subsystem is currently busy. Retry later. */
|
|
request->status = TAPE_REQUEST_QUEUED;
|
|
schedule_delayed_work(&device->tape_dnr, 0);
|
|
rc = 0;
|
|
} else {
|
|
/* Start failed. Remove request and indicate failure. */
|
|
DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
__tape_start_next_request(struct tape_device *device)
|
|
{
|
|
struct list_head *l, *n;
|
|
struct tape_request *request;
|
|
int rc;
|
|
|
|
DBF_LH(6, "__tape_start_next_request(%p)\n", device);
|
|
/*
|
|
* Try to start each request on request queue until one is
|
|
* started successful.
|
|
*/
|
|
list_for_each_safe(l, n, &device->req_queue) {
|
|
request = list_entry(l, struct tape_request, list);
|
|
|
|
/*
|
|
* Avoid race condition if bottom-half was triggered more than
|
|
* once.
|
|
*/
|
|
if (request->status == TAPE_REQUEST_IN_IO)
|
|
return;
|
|
/*
|
|
* Request has already been stopped. We have to wait until
|
|
* the request is removed from the queue in the interrupt
|
|
* handling.
|
|
*/
|
|
if (request->status == TAPE_REQUEST_DONE)
|
|
return;
|
|
|
|
/*
|
|
* We wanted to cancel the request but the common I/O layer
|
|
* was busy at that time. This can only happen if this
|
|
* function is called by delayed_next_request.
|
|
* Otherwise we start the next request on the queue.
|
|
*/
|
|
if (request->status == TAPE_REQUEST_CANCEL) {
|
|
rc = __tape_cancel_io(device, request);
|
|
} else {
|
|
rc = __tape_start_io(device, request);
|
|
}
|
|
if (rc == 0)
|
|
return;
|
|
|
|
/* Set ending status. */
|
|
request->rc = rc;
|
|
request->status = TAPE_REQUEST_DONE;
|
|
|
|
/* Remove from request queue. */
|
|
list_del(&request->list);
|
|
|
|
/* Do callback. */
|
|
if (request->callback != NULL)
|
|
request->callback(request, request->callback_data);
|
|
}
|
|
}
|
|
|
|
static void
|
|
tape_delayed_next_request(struct work_struct *work)
|
|
{
|
|
struct tape_device *device =
|
|
container_of(work, struct tape_device, tape_dnr.work);
|
|
|
|
DBF_LH(6, "tape_delayed_next_request(%p)\n", device);
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
__tape_start_next_request(device);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
}
|
|
|
|
static void tape_long_busy_timeout(struct timer_list *t)
|
|
{
|
|
struct tape_device *device = from_timer(device, t, lb_timeout);
|
|
struct tape_request *request;
|
|
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
request = list_entry(device->req_queue.next, struct tape_request, list);
|
|
BUG_ON(request->status != TAPE_REQUEST_LONG_BUSY);
|
|
DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id);
|
|
__tape_start_next_request(device);
|
|
tape_put_device(device);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
}
|
|
|
|
static void
|
|
__tape_end_request(
|
|
struct tape_device * device,
|
|
struct tape_request * request,
|
|
int rc)
|
|
{
|
|
DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc);
|
|
if (request) {
|
|
request->rc = rc;
|
|
request->status = TAPE_REQUEST_DONE;
|
|
|
|
/* Remove from request queue. */
|
|
list_del(&request->list);
|
|
|
|
/* Do callback. */
|
|
if (request->callback != NULL)
|
|
request->callback(request, request->callback_data);
|
|
}
|
|
|
|
/* Start next request. */
|
|
if (!list_empty(&device->req_queue))
|
|
__tape_start_next_request(device);
|
|
}
|
|
|
|
/*
|
|
* Write sense data to dbf
|
|
*/
|
|
void
|
|
tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request,
|
|
struct irb *irb)
|
|
{
|
|
unsigned int *sptr;
|
|
const char* op;
|
|
|
|
if (request != NULL)
|
|
op = tape_op_verbose[request->op];
|
|
else
|
|
op = "---";
|
|
DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n",
|
|
irb->scsw.cmd.dstat, irb->scsw.cmd.cstat);
|
|
DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op);
|
|
sptr = (unsigned int *) irb->ecw;
|
|
DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]);
|
|
DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]);
|
|
DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]);
|
|
DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]);
|
|
}
|
|
|
|
/*
|
|
* I/O helper function. Adds the request to the request queue
|
|
* and starts it if the tape is idle. Has to be called with
|
|
* the device lock held.
|
|
*/
|
|
static int
|
|
__tape_start_request(struct tape_device *device, struct tape_request *request)
|
|
{
|
|
int rc;
|
|
|
|
switch (request->op) {
|
|
case TO_MSEN:
|
|
case TO_ASSIGN:
|
|
case TO_UNASSIGN:
|
|
case TO_READ_ATTMSG:
|
|
case TO_RDC:
|
|
if (device->tape_state == TS_INIT)
|
|
break;
|
|
if (device->tape_state == TS_UNUSED)
|
|
break;
|
|
/* fallthrough */
|
|
default:
|
|
if (device->tape_state == TS_BLKUSE)
|
|
break;
|
|
if (device->tape_state != TS_IN_USE)
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Increase use count of device for the added request. */
|
|
request->device = tape_get_device(device);
|
|
|
|
if (list_empty(&device->req_queue)) {
|
|
/* No other requests are on the queue. Start this one. */
|
|
rc = __tape_start_io(device, request);
|
|
if (rc)
|
|
return rc;
|
|
|
|
DBF_LH(5, "Request %p added for execution.\n", request);
|
|
list_add(&request->list, &device->req_queue);
|
|
} else {
|
|
DBF_LH(5, "Request %p add to queue.\n", request);
|
|
request->status = TAPE_REQUEST_QUEUED;
|
|
list_add_tail(&request->list, &device->req_queue);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Add the request to the request queue, try to start it if the
|
|
* tape is idle. Return without waiting for end of i/o.
|
|
*/
|
|
int
|
|
tape_do_io_async(struct tape_device *device, struct tape_request *request)
|
|
{
|
|
int rc;
|
|
|
|
DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request);
|
|
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Add request to request queue and try to start it. */
|
|
rc = __tape_start_request(device, request);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* tape_do_io/__tape_wake_up
|
|
* Add the request to the request queue, try to start it if the
|
|
* tape is idle and wait uninterruptible for its completion.
|
|
*/
|
|
static void
|
|
__tape_wake_up(struct tape_request *request, void *data)
|
|
{
|
|
request->callback = NULL;
|
|
wake_up((wait_queue_head_t *) data);
|
|
}
|
|
|
|
int
|
|
tape_do_io(struct tape_device *device, struct tape_request *request)
|
|
{
|
|
int rc;
|
|
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Setup callback */
|
|
request->callback = __tape_wake_up;
|
|
request->callback_data = &device->wait_queue;
|
|
/* Add request to request queue and try to start it. */
|
|
rc = __tape_start_request(device, request);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
if (rc)
|
|
return rc;
|
|
/* Request added to the queue. Wait for its completion. */
|
|
wait_event(device->wait_queue, (request->callback == NULL));
|
|
/* Get rc from request */
|
|
return request->rc;
|
|
}
|
|
|
|
/*
|
|
* tape_do_io_interruptible/__tape_wake_up_interruptible
|
|
* Add the request to the request queue, try to start it if the
|
|
* tape is idle and wait uninterruptible for its completion.
|
|
*/
|
|
static void
|
|
__tape_wake_up_interruptible(struct tape_request *request, void *data)
|
|
{
|
|
request->callback = NULL;
|
|
wake_up_interruptible((wait_queue_head_t *) data);
|
|
}
|
|
|
|
int
|
|
tape_do_io_interruptible(struct tape_device *device,
|
|
struct tape_request *request)
|
|
{
|
|
int rc;
|
|
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
/* Setup callback */
|
|
request->callback = __tape_wake_up_interruptible;
|
|
request->callback_data = &device->wait_queue;
|
|
rc = __tape_start_request(device, request);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
if (rc)
|
|
return rc;
|
|
/* Request added to the queue. Wait for its completion. */
|
|
rc = wait_event_interruptible(device->wait_queue,
|
|
(request->callback == NULL));
|
|
if (rc != -ERESTARTSYS)
|
|
/* Request finished normally. */
|
|
return request->rc;
|
|
|
|
/* Interrupted by a signal. We have to stop the current request. */
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = __tape_cancel_io(device, request);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
if (rc == 0) {
|
|
/* Wait for the interrupt that acknowledges the halt. */
|
|
do {
|
|
rc = wait_event_interruptible(
|
|
device->wait_queue,
|
|
(request->callback == NULL)
|
|
);
|
|
} while (rc == -ERESTARTSYS);
|
|
|
|
DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id);
|
|
rc = -ERESTARTSYS;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Stop running ccw.
|
|
*/
|
|
int
|
|
tape_cancel_io(struct tape_device *device, struct tape_request *request)
|
|
{
|
|
int rc;
|
|
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
rc = __tape_cancel_io(device, request);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Tape interrupt routine, called from the ccw_device layer
|
|
*/
|
|
static void
|
|
__tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
|
|
{
|
|
struct tape_device *device;
|
|
struct tape_request *request;
|
|
int rc;
|
|
|
|
device = dev_get_drvdata(&cdev->dev);
|
|
if (device == NULL) {
|
|
return;
|
|
}
|
|
request = (struct tape_request *) intparm;
|
|
|
|
DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request);
|
|
|
|
/* On special conditions irb is an error pointer */
|
|
if (IS_ERR(irb)) {
|
|
/* FIXME: What to do with the request? */
|
|
switch (PTR_ERR(irb)) {
|
|
case -ETIMEDOUT:
|
|
DBF_LH(1, "(%08x): Request timed out\n",
|
|
device->cdev_id);
|
|
/* fallthrough */
|
|
case -EIO:
|
|
__tape_end_request(device, request, -EIO);
|
|
break;
|
|
default:
|
|
DBF_LH(1, "(%08x): Unexpected i/o error %li\n",
|
|
device->cdev_id, PTR_ERR(irb));
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If the condition code is not zero and the start function bit is
|
|
* still set, this is an deferred error and the last start I/O did
|
|
* not succeed. At this point the condition that caused the deferred
|
|
* error might still apply. So we just schedule the request to be
|
|
* started later.
|
|
*/
|
|
if (irb->scsw.cmd.cc != 0 &&
|
|
(irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
|
|
(request->status == TAPE_REQUEST_IN_IO)) {
|
|
DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n",
|
|
device->cdev_id, irb->scsw.cmd.cc, irb->scsw.cmd.fctl);
|
|
request->status = TAPE_REQUEST_QUEUED;
|
|
schedule_delayed_work(&device->tape_dnr, HZ);
|
|
return;
|
|
}
|
|
|
|
/* May be an unsolicited irq */
|
|
if(request != NULL)
|
|
request->rescnt = irb->scsw.cmd.count;
|
|
else if ((irb->scsw.cmd.dstat == 0x85 || irb->scsw.cmd.dstat == 0x80) &&
|
|
!list_empty(&device->req_queue)) {
|
|
/* Not Ready to Ready after long busy ? */
|
|
struct tape_request *req;
|
|
req = list_entry(device->req_queue.next,
|
|
struct tape_request, list);
|
|
if (req->status == TAPE_REQUEST_LONG_BUSY) {
|
|
DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id);
|
|
if (del_timer(&device->lb_timeout)) {
|
|
tape_put_device(device);
|
|
__tape_start_next_request(device);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
if (irb->scsw.cmd.dstat != 0x0c) {
|
|
/* Set the 'ONLINE' flag depending on sense byte 1 */
|
|
if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE)
|
|
device->tape_generic_status |= GMT_ONLINE(~0);
|
|
else
|
|
device->tape_generic_status &= ~GMT_ONLINE(~0);
|
|
|
|
/*
|
|
* Any request that does not come back with channel end
|
|
* and device end is unusual. Log the sense data.
|
|
*/
|
|
DBF_EVENT(3,"-- Tape Interrupthandler --\n");
|
|
tape_dump_sense_dbf(device, request, irb);
|
|
} else {
|
|
/* Upon normal completion the device _is_ online */
|
|
device->tape_generic_status |= GMT_ONLINE(~0);
|
|
}
|
|
if (device->tape_state == TS_NOT_OPER) {
|
|
DBF_EVENT(6, "tape:device is not operational\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Request that were canceled still come back with an interrupt.
|
|
* To detect these request the state will be set to TAPE_REQUEST_DONE.
|
|
*/
|
|
if(request != NULL && request->status == TAPE_REQUEST_DONE) {
|
|
__tape_end_request(device, request, -EIO);
|
|
return;
|
|
}
|
|
|
|
rc = device->discipline->irq(device, request, irb);
|
|
/*
|
|
* rc < 0 : request finished unsuccessfully.
|
|
* rc == TAPE_IO_SUCCESS: request finished successfully.
|
|
* rc == TAPE_IO_PENDING: request is still running. Ignore rc.
|
|
* rc == TAPE_IO_RETRY: request finished but needs another go.
|
|
* rc == TAPE_IO_STOP: request needs to get terminated.
|
|
*/
|
|
switch (rc) {
|
|
case TAPE_IO_SUCCESS:
|
|
/* Upon normal completion the device _is_ online */
|
|
device->tape_generic_status |= GMT_ONLINE(~0);
|
|
__tape_end_request(device, request, rc);
|
|
break;
|
|
case TAPE_IO_PENDING:
|
|
break;
|
|
case TAPE_IO_LONG_BUSY:
|
|
device->lb_timeout.expires = jiffies +
|
|
LONG_BUSY_TIMEOUT * HZ;
|
|
DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id);
|
|
add_timer(&device->lb_timeout);
|
|
request->status = TAPE_REQUEST_LONG_BUSY;
|
|
break;
|
|
case TAPE_IO_RETRY:
|
|
rc = __tape_start_io(device, request);
|
|
if (rc)
|
|
__tape_end_request(device, request, rc);
|
|
break;
|
|
case TAPE_IO_STOP:
|
|
rc = __tape_cancel_io(device, request);
|
|
if (rc)
|
|
__tape_end_request(device, request, rc);
|
|
break;
|
|
default:
|
|
if (rc > 0) {
|
|
DBF_EVENT(6, "xunknownrc\n");
|
|
__tape_end_request(device, request, -EIO);
|
|
} else {
|
|
__tape_end_request(device, request, rc);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Tape device open function used by tape_char frontend.
|
|
*/
|
|
int
|
|
tape_open(struct tape_device *device)
|
|
{
|
|
int rc;
|
|
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
if (device->tape_state == TS_NOT_OPER) {
|
|
DBF_EVENT(6, "TAPE:nodev\n");
|
|
rc = -ENODEV;
|
|
} else if (device->tape_state == TS_IN_USE) {
|
|
DBF_EVENT(6, "TAPE:dbusy\n");
|
|
rc = -EBUSY;
|
|
} else if (device->tape_state == TS_BLKUSE) {
|
|
DBF_EVENT(6, "TAPE:dbusy\n");
|
|
rc = -EBUSY;
|
|
} else if (device->discipline != NULL &&
|
|
!try_module_get(device->discipline->owner)) {
|
|
DBF_EVENT(6, "TAPE:nodisc\n");
|
|
rc = -ENODEV;
|
|
} else {
|
|
tape_state_set(device, TS_IN_USE);
|
|
rc = 0;
|
|
}
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Tape device release function used by tape_char frontend.
|
|
*/
|
|
int
|
|
tape_release(struct tape_device *device)
|
|
{
|
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
|
if (device->tape_state == TS_IN_USE)
|
|
tape_state_set(device, TS_UNUSED);
|
|
module_put(device->discipline->owner);
|
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Execute a magnetic tape command a number of times.
|
|
*/
|
|
int
|
|
tape_mtop(struct tape_device *device, int mt_op, int mt_count)
|
|
{
|
|
tape_mtop_fn fn;
|
|
int rc;
|
|
|
|
DBF_EVENT(6, "TAPE:mtio\n");
|
|
DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op);
|
|
DBF_EVENT(6, "TAPE:arg: %x\n", mt_count);
|
|
|
|
if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS)
|
|
return -EINVAL;
|
|
fn = device->discipline->mtop_array[mt_op];
|
|
if (fn == NULL)
|
|
return -EINVAL;
|
|
|
|
/* We assume that the backends can handle count up to 500. */
|
|
if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF ||
|
|
mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) {
|
|
rc = 0;
|
|
for (; mt_count > 500; mt_count -= 500)
|
|
if ((rc = fn(device, 500)) != 0)
|
|
break;
|
|
if (rc == 0)
|
|
rc = fn(device, mt_count);
|
|
} else
|
|
rc = fn(device, mt_count);
|
|
return rc;
|
|
|
|
}
|
|
|
|
/*
|
|
* Tape init function.
|
|
*/
|
|
static int
|
|
tape_init (void)
|
|
{
|
|
TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long));
|
|
debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
|
|
#ifdef DBF_LIKE_HELL
|
|
debug_set_level(TAPE_DBF_AREA, 6);
|
|
#endif
|
|
DBF_EVENT(3, "tape init\n");
|
|
tape_proc_init();
|
|
tapechar_init ();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Tape exit function.
|
|
*/
|
|
static void
|
|
tape_exit(void)
|
|
{
|
|
DBF_EVENT(6, "tape exit\n");
|
|
|
|
/* Get rid of the frontends */
|
|
tapechar_exit();
|
|
tape_proc_cleanup();
|
|
debug_unregister (TAPE_DBF_AREA);
|
|
}
|
|
|
|
MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and "
|
|
"Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)");
|
|
MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(tape_init);
|
|
module_exit(tape_exit);
|
|
|
|
EXPORT_SYMBOL(tape_generic_remove);
|
|
EXPORT_SYMBOL(tape_generic_probe);
|
|
EXPORT_SYMBOL(tape_generic_online);
|
|
EXPORT_SYMBOL(tape_generic_offline);
|
|
EXPORT_SYMBOL(tape_generic_pm_suspend);
|
|
EXPORT_SYMBOL(tape_put_device);
|
|
EXPORT_SYMBOL(tape_get_device);
|
|
EXPORT_SYMBOL(tape_state_verbose);
|
|
EXPORT_SYMBOL(tape_op_verbose);
|
|
EXPORT_SYMBOL(tape_state_set);
|
|
EXPORT_SYMBOL(tape_med_state_set);
|
|
EXPORT_SYMBOL(tape_alloc_request);
|
|
EXPORT_SYMBOL(tape_free_request);
|
|
EXPORT_SYMBOL(tape_dump_sense_dbf);
|
|
EXPORT_SYMBOL(tape_do_io);
|
|
EXPORT_SYMBOL(tape_do_io_async);
|
|
EXPORT_SYMBOL(tape_do_io_interruptible);
|
|
EXPORT_SYMBOL(tape_cancel_io);
|
|
EXPORT_SYMBOL(tape_mtop);
|