mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 14:26:41 +07:00
7712f83aa9
Remove trivially unused variables as detected with -Wunused-but-set-variable. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1105 lines
30 KiB
C
1105 lines
30 KiB
C
/*
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* drivers/s390/cio/device_fsm.c
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* finite state machine for device handling
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*
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* Copyright IBM Corp. 2002,2008
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* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/string.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include <asm/chpid.h>
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#include "cio.h"
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#include "cio_debug.h"
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#include "css.h"
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#include "device.h"
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#include "chsc.h"
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#include "ioasm.h"
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#include "chp.h"
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static int timeout_log_enabled;
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static int __init ccw_timeout_log_setup(char *unused)
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{
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timeout_log_enabled = 1;
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return 1;
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}
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__setup("ccw_timeout_log", ccw_timeout_log_setup);
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static void ccw_timeout_log(struct ccw_device *cdev)
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{
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struct schib schib;
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struct subchannel *sch;
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struct io_subchannel_private *private;
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union orb *orb;
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int cc;
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sch = to_subchannel(cdev->dev.parent);
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private = to_io_private(sch);
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orb = &private->orb;
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cc = stsch_err(sch->schid, &schib);
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printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
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"device information:\n", get_clock());
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printk(KERN_WARNING "cio: orb:\n");
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print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
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orb, sizeof(*orb), 0);
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printk(KERN_WARNING "cio: ccw device bus id: %s\n",
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dev_name(&cdev->dev));
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printk(KERN_WARNING "cio: subchannel bus id: %s\n",
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dev_name(&sch->dev));
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printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
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"vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
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if (orb->tm.b) {
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printk(KERN_WARNING "cio: orb indicates transport mode\n");
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printk(KERN_WARNING "cio: last tcw:\n");
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print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
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(void *)(addr_t)orb->tm.tcw,
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sizeof(struct tcw), 0);
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} else {
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printk(KERN_WARNING "cio: orb indicates command mode\n");
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if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
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(void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
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printk(KERN_WARNING "cio: last channel program "
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"(intern):\n");
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else
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printk(KERN_WARNING "cio: last channel program:\n");
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print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
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(void *)(addr_t)orb->cmd.cpa,
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sizeof(struct ccw1), 0);
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}
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printk(KERN_WARNING "cio: ccw device state: %d\n",
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cdev->private->state);
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printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
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printk(KERN_WARNING "cio: schib:\n");
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print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
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&schib, sizeof(schib), 0);
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printk(KERN_WARNING "cio: ccw device flags:\n");
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print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
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&cdev->private->flags, sizeof(cdev->private->flags), 0);
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}
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/*
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* Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
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*/
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static void
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ccw_device_timeout(unsigned long data)
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{
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struct ccw_device *cdev;
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cdev = (struct ccw_device *) data;
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spin_lock_irq(cdev->ccwlock);
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if (timeout_log_enabled)
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ccw_timeout_log(cdev);
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dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
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spin_unlock_irq(cdev->ccwlock);
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}
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/*
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* Set timeout
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*/
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void
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ccw_device_set_timeout(struct ccw_device *cdev, int expires)
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{
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if (expires == 0) {
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del_timer(&cdev->private->timer);
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return;
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}
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if (timer_pending(&cdev->private->timer)) {
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if (mod_timer(&cdev->private->timer, jiffies + expires))
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return;
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}
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cdev->private->timer.function = ccw_device_timeout;
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cdev->private->timer.data = (unsigned long) cdev;
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cdev->private->timer.expires = jiffies + expires;
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add_timer(&cdev->private->timer);
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}
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/*
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* Cancel running i/o. This is called repeatedly since halt/clear are
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* asynchronous operations. We do one try with cio_cancel, two tries
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* with cio_halt, 255 tries with cio_clear. If everythings fails panic.
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* Returns 0 if device now idle, -ENODEV for device not operational and
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* -EBUSY if an interrupt is expected (either from halt/clear or from a
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* status pending).
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*/
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int
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ccw_device_cancel_halt_clear(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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int ret;
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sch = to_subchannel(cdev->dev.parent);
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if (cio_update_schib(sch))
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return -ENODEV;
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if (!sch->schib.pmcw.ena)
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/* Not operational -> done. */
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return 0;
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/* Stage 1: cancel io. */
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if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
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!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
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if (!scsw_is_tm(&sch->schib.scsw)) {
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ret = cio_cancel(sch);
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if (ret != -EINVAL)
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return ret;
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}
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/* cancel io unsuccessful or not applicable (transport mode).
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* Continue with asynchronous instructions. */
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cdev->private->iretry = 3; /* 3 halt retries. */
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}
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if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
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/* Stage 2: halt io. */
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if (cdev->private->iretry) {
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cdev->private->iretry--;
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ret = cio_halt(sch);
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if (ret != -EBUSY)
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return (ret == 0) ? -EBUSY : ret;
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}
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/* halt io unsuccessful. */
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cdev->private->iretry = 255; /* 255 clear retries. */
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}
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/* Stage 3: clear io. */
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if (cdev->private->iretry) {
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cdev->private->iretry--;
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ret = cio_clear (sch);
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return (ret == 0) ? -EBUSY : ret;
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}
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/* Function was unsuccessful */
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CIO_MSG_EVENT(0, "0.%x.%04x: could not stop I/O\n",
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cdev->private->dev_id.ssid, cdev->private->dev_id.devno);
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return -EIO;
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}
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void ccw_device_update_sense_data(struct ccw_device *cdev)
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{
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memset(&cdev->id, 0, sizeof(cdev->id));
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cdev->id.cu_type = cdev->private->senseid.cu_type;
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cdev->id.cu_model = cdev->private->senseid.cu_model;
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cdev->id.dev_type = cdev->private->senseid.dev_type;
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cdev->id.dev_model = cdev->private->senseid.dev_model;
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}
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int ccw_device_test_sense_data(struct ccw_device *cdev)
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{
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return cdev->id.cu_type == cdev->private->senseid.cu_type &&
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cdev->id.cu_model == cdev->private->senseid.cu_model &&
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cdev->id.dev_type == cdev->private->senseid.dev_type &&
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cdev->id.dev_model == cdev->private->senseid.dev_model;
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}
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/*
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* The machine won't give us any notification by machine check if a chpid has
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* been varied online on the SE so we have to find out by magic (i. e. driving
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* the channel subsystem to device selection and updating our path masks).
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*/
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static void
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__recover_lost_chpids(struct subchannel *sch, int old_lpm)
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{
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int mask, i;
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struct chp_id chpid;
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chp_id_init(&chpid);
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for (i = 0; i<8; i++) {
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mask = 0x80 >> i;
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if (!(sch->lpm & mask))
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continue;
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if (old_lpm & mask)
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continue;
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chpid.id = sch->schib.pmcw.chpid[i];
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if (!chp_is_registered(chpid))
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css_schedule_eval_all();
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}
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}
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/*
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* Stop device recognition.
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*/
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static void
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ccw_device_recog_done(struct ccw_device *cdev, int state)
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{
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struct subchannel *sch;
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int old_lpm;
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sch = to_subchannel(cdev->dev.parent);
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if (cio_disable_subchannel(sch))
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state = DEV_STATE_NOT_OPER;
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/*
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* Now that we tried recognition, we have performed device selection
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* through ssch() and the path information is up to date.
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*/
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old_lpm = sch->lpm;
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/* Check since device may again have become not operational. */
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if (cio_update_schib(sch))
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state = DEV_STATE_NOT_OPER;
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else
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sch->lpm = sch->schib.pmcw.pam & sch->opm;
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if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
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/* Force reprobe on all chpids. */
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old_lpm = 0;
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if (sch->lpm != old_lpm)
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__recover_lost_chpids(sch, old_lpm);
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if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID &&
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(state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) {
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cdev->private->flags.recog_done = 1;
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cdev->private->state = DEV_STATE_DISCONNECTED;
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wake_up(&cdev->private->wait_q);
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return;
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}
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if (cdev->private->flags.resuming) {
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cdev->private->state = state;
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cdev->private->flags.recog_done = 1;
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wake_up(&cdev->private->wait_q);
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return;
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}
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switch (state) {
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case DEV_STATE_NOT_OPER:
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break;
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case DEV_STATE_OFFLINE:
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if (!cdev->online) {
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ccw_device_update_sense_data(cdev);
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break;
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}
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cdev->private->state = DEV_STATE_OFFLINE;
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cdev->private->flags.recog_done = 1;
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if (ccw_device_test_sense_data(cdev)) {
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cdev->private->flags.donotify = 1;
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ccw_device_online(cdev);
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wake_up(&cdev->private->wait_q);
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} else {
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ccw_device_update_sense_data(cdev);
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ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
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}
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return;
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case DEV_STATE_BOXED:
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if (cdev->id.cu_type != 0) { /* device was recognized before */
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cdev->private->flags.recog_done = 1;
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cdev->private->state = DEV_STATE_BOXED;
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wake_up(&cdev->private->wait_q);
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return;
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}
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break;
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}
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cdev->private->state = state;
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io_subchannel_recog_done(cdev);
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wake_up(&cdev->private->wait_q);
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}
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/*
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* Function called from device_id.c after sense id has completed.
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*/
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void
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ccw_device_sense_id_done(struct ccw_device *cdev, int err)
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{
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switch (err) {
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case 0:
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ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
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break;
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case -ETIME: /* Sense id stopped by timeout. */
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ccw_device_recog_done(cdev, DEV_STATE_BOXED);
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break;
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default:
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ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
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break;
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}
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}
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/**
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* ccw_device_notify() - inform the device's driver about an event
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* @cdev: device for which an event occurred
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* @event: event that occurred
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*
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* Returns:
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* -%EINVAL if the device is offline or has no driver.
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* -%EOPNOTSUPP if the device's driver has no notifier registered.
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* %NOTIFY_OK if the driver wants to keep the device.
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* %NOTIFY_BAD if the driver doesn't want to keep the device.
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*/
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int ccw_device_notify(struct ccw_device *cdev, int event)
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{
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int ret = -EINVAL;
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if (!cdev->drv)
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goto out;
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if (!cdev->online)
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goto out;
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CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
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cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
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event);
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if (!cdev->drv->notify) {
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ret = -EOPNOTSUPP;
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goto out;
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}
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if (cdev->drv->notify(cdev, event))
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ret = NOTIFY_OK;
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else
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ret = NOTIFY_BAD;
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out:
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return ret;
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}
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static void ccw_device_oper_notify(struct ccw_device *cdev)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) {
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/* Reenable channel measurements, if needed. */
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ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF);
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/* Save indication for new paths. */
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cdev->private->path_new_mask = sch->vpm;
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return;
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}
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/* Driver doesn't want device back. */
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ccw_device_set_notoper(cdev);
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ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
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}
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/*
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* Finished with online/offline processing.
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*/
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static void
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ccw_device_done(struct ccw_device *cdev, int state)
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{
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struct subchannel *sch;
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sch = to_subchannel(cdev->dev.parent);
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ccw_device_set_timeout(cdev, 0);
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if (state != DEV_STATE_ONLINE)
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cio_disable_subchannel(sch);
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/* Reset device status. */
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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cdev->private->state = state;
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switch (state) {
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case DEV_STATE_BOXED:
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CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
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cdev->private->dev_id.devno, sch->schid.sch_no);
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if (cdev->online &&
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ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK)
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ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
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cdev->private->flags.donotify = 0;
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break;
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case DEV_STATE_NOT_OPER:
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CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n",
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cdev->private->dev_id.devno, sch->schid.sch_no);
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if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
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ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
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else
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ccw_device_set_disconnected(cdev);
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cdev->private->flags.donotify = 0;
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break;
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case DEV_STATE_DISCONNECTED:
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CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel "
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"%04x\n", cdev->private->dev_id.devno,
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sch->schid.sch_no);
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if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) {
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cdev->private->state = DEV_STATE_NOT_OPER;
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ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
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} else
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ccw_device_set_disconnected(cdev);
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cdev->private->flags.donotify = 0;
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break;
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default:
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break;
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}
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if (cdev->private->flags.donotify) {
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cdev->private->flags.donotify = 0;
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ccw_device_oper_notify(cdev);
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}
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wake_up(&cdev->private->wait_q);
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}
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/*
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* Start device recognition.
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*/
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void ccw_device_recognition(struct ccw_device *cdev)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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|
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/*
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* We used to start here with a sense pgid to find out whether a device
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* is locked by someone else. Unfortunately, the sense pgid command
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* code has other meanings on devices predating the path grouping
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* algorithm, so we start with sense id and box the device after an
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* timeout (or if sense pgid during path verification detects the device
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* is locked, as may happen on newer devices).
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*/
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cdev->private->flags.recog_done = 0;
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cdev->private->state = DEV_STATE_SENSE_ID;
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if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) {
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ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
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return;
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}
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ccw_device_sense_id_start(cdev);
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}
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|
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/*
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* Handle events for states that use the ccw request infrastructure.
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*/
|
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static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e)
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{
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switch (e) {
|
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case DEV_EVENT_NOTOPER:
|
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ccw_request_notoper(cdev);
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break;
|
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case DEV_EVENT_INTERRUPT:
|
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ccw_request_handler(cdev);
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break;
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case DEV_EVENT_TIMEOUT:
|
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ccw_request_timeout(cdev);
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break;
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default:
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break;
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}
|
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}
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|
|
static void ccw_device_report_path_events(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch = to_subchannel(cdev->dev.parent);
|
|
int path_event[8];
|
|
int chp, mask;
|
|
|
|
for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) {
|
|
path_event[chp] = PE_NONE;
|
|
if (mask & cdev->private->path_gone_mask & ~(sch->vpm))
|
|
path_event[chp] |= PE_PATH_GONE;
|
|
if (mask & cdev->private->path_new_mask & sch->vpm)
|
|
path_event[chp] |= PE_PATH_AVAILABLE;
|
|
if (mask & cdev->private->pgid_reset_mask & sch->vpm)
|
|
path_event[chp] |= PE_PATHGROUP_ESTABLISHED;
|
|
}
|
|
if (cdev->online && cdev->drv->path_event)
|
|
cdev->drv->path_event(cdev, path_event);
|
|
}
|
|
|
|
static void ccw_device_reset_path_events(struct ccw_device *cdev)
|
|
{
|
|
cdev->private->path_gone_mask = 0;
|
|
cdev->private->path_new_mask = 0;
|
|
cdev->private->pgid_reset_mask = 0;
|
|
}
|
|
|
|
void
|
|
ccw_device_verify_done(struct ccw_device *cdev, int err)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
/* Update schib - pom may have changed. */
|
|
if (cio_update_schib(sch)) {
|
|
err = -ENODEV;
|
|
goto callback;
|
|
}
|
|
/* Update lpm with verified path mask. */
|
|
sch->lpm = sch->vpm;
|
|
/* Repeat path verification? */
|
|
if (cdev->private->flags.doverify) {
|
|
ccw_device_verify_start(cdev);
|
|
return;
|
|
}
|
|
callback:
|
|
switch (err) {
|
|
case 0:
|
|
ccw_device_done(cdev, DEV_STATE_ONLINE);
|
|
/* Deliver fake irb to device driver, if needed. */
|
|
if (cdev->private->flags.fake_irb) {
|
|
memset(&cdev->private->irb, 0, sizeof(struct irb));
|
|
cdev->private->irb.scsw.cmd.cc = 1;
|
|
cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC;
|
|
cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND;
|
|
cdev->private->irb.scsw.cmd.stctl =
|
|
SCSW_STCTL_STATUS_PEND;
|
|
cdev->private->flags.fake_irb = 0;
|
|
if (cdev->handler)
|
|
cdev->handler(cdev, cdev->private->intparm,
|
|
&cdev->private->irb);
|
|
memset(&cdev->private->irb, 0, sizeof(struct irb));
|
|
}
|
|
ccw_device_report_path_events(cdev);
|
|
break;
|
|
case -ETIME:
|
|
case -EUSERS:
|
|
/* Reset oper notify indication after verify error. */
|
|
cdev->private->flags.donotify = 0;
|
|
ccw_device_done(cdev, DEV_STATE_BOXED);
|
|
break;
|
|
case -EACCES:
|
|
/* Reset oper notify indication after verify error. */
|
|
cdev->private->flags.donotify = 0;
|
|
ccw_device_done(cdev, DEV_STATE_DISCONNECTED);
|
|
break;
|
|
default:
|
|
/* Reset oper notify indication after verify error. */
|
|
cdev->private->flags.donotify = 0;
|
|
ccw_device_done(cdev, DEV_STATE_NOT_OPER);
|
|
break;
|
|
}
|
|
ccw_device_reset_path_events(cdev);
|
|
}
|
|
|
|
/*
|
|
* Get device online.
|
|
*/
|
|
int
|
|
ccw_device_online(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
int ret;
|
|
|
|
if ((cdev->private->state != DEV_STATE_OFFLINE) &&
|
|
(cdev->private->state != DEV_STATE_BOXED))
|
|
return -EINVAL;
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
|
|
if (ret != 0) {
|
|
/* Couldn't enable the subchannel for i/o. Sick device. */
|
|
if (ret == -ENODEV)
|
|
dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
|
|
return ret;
|
|
}
|
|
/* Start initial path verification. */
|
|
cdev->private->state = DEV_STATE_VERIFY;
|
|
ccw_device_verify_start(cdev);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
ccw_device_disband_done(struct ccw_device *cdev, int err)
|
|
{
|
|
switch (err) {
|
|
case 0:
|
|
ccw_device_done(cdev, DEV_STATE_OFFLINE);
|
|
break;
|
|
case -ETIME:
|
|
ccw_device_done(cdev, DEV_STATE_BOXED);
|
|
break;
|
|
default:
|
|
cdev->private->flags.donotify = 0;
|
|
ccw_device_done(cdev, DEV_STATE_NOT_OPER);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Shutdown device.
|
|
*/
|
|
int
|
|
ccw_device_offline(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
/* Allow ccw_device_offline while disconnected. */
|
|
if (cdev->private->state == DEV_STATE_DISCONNECTED ||
|
|
cdev->private->state == DEV_STATE_NOT_OPER) {
|
|
cdev->private->flags.donotify = 0;
|
|
ccw_device_done(cdev, DEV_STATE_NOT_OPER);
|
|
return 0;
|
|
}
|
|
if (cdev->private->state == DEV_STATE_BOXED) {
|
|
ccw_device_done(cdev, DEV_STATE_BOXED);
|
|
return 0;
|
|
}
|
|
if (ccw_device_is_orphan(cdev)) {
|
|
ccw_device_done(cdev, DEV_STATE_OFFLINE);
|
|
return 0;
|
|
}
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
if (cio_update_schib(sch))
|
|
return -ENODEV;
|
|
if (scsw_actl(&sch->schib.scsw) != 0)
|
|
return -EBUSY;
|
|
if (cdev->private->state != DEV_STATE_ONLINE)
|
|
return -EINVAL;
|
|
/* Are we doing path grouping? */
|
|
if (!cdev->private->flags.pgroup) {
|
|
/* No, set state offline immediately. */
|
|
ccw_device_done(cdev, DEV_STATE_OFFLINE);
|
|
return 0;
|
|
}
|
|
/* Start Set Path Group commands. */
|
|
cdev->private->state = DEV_STATE_DISBAND_PGID;
|
|
ccw_device_disband_start(cdev);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Handle not operational event in non-special state.
|
|
*/
|
|
static void ccw_device_generic_notoper(struct ccw_device *cdev,
|
|
enum dev_event dev_event)
|
|
{
|
|
if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
|
|
ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
|
|
else
|
|
ccw_device_set_disconnected(cdev);
|
|
}
|
|
|
|
/*
|
|
* Handle path verification event in offline state.
|
|
*/
|
|
static void ccw_device_offline_verify(struct ccw_device *cdev,
|
|
enum dev_event dev_event)
|
|
{
|
|
struct subchannel *sch = to_subchannel(cdev->dev.parent);
|
|
|
|
css_schedule_eval(sch->schid);
|
|
}
|
|
|
|
/*
|
|
* Handle path verification event.
|
|
*/
|
|
static void
|
|
ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
if (cdev->private->state == DEV_STATE_W4SENSE) {
|
|
cdev->private->flags.doverify = 1;
|
|
return;
|
|
}
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
/*
|
|
* Since we might not just be coming from an interrupt from the
|
|
* subchannel we have to update the schib.
|
|
*/
|
|
if (cio_update_schib(sch)) {
|
|
ccw_device_verify_done(cdev, -ENODEV);
|
|
return;
|
|
}
|
|
|
|
if (scsw_actl(&sch->schib.scsw) != 0 ||
|
|
(scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
|
|
(scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
|
|
/*
|
|
* No final status yet or final status not yet delivered
|
|
* to the device driver. Can't do path verification now,
|
|
* delay until final status was delivered.
|
|
*/
|
|
cdev->private->flags.doverify = 1;
|
|
return;
|
|
}
|
|
/* Device is idle, we can do the path verification. */
|
|
cdev->private->state = DEV_STATE_VERIFY;
|
|
ccw_device_verify_start(cdev);
|
|
}
|
|
|
|
/*
|
|
* Handle path verification event in boxed state.
|
|
*/
|
|
static void ccw_device_boxed_verify(struct ccw_device *cdev,
|
|
enum dev_event dev_event)
|
|
{
|
|
struct subchannel *sch = to_subchannel(cdev->dev.parent);
|
|
|
|
if (cdev->online) {
|
|
if (cio_enable_subchannel(sch, (u32) (addr_t) sch))
|
|
ccw_device_done(cdev, DEV_STATE_NOT_OPER);
|
|
else
|
|
ccw_device_online_verify(cdev, dev_event);
|
|
} else
|
|
css_schedule_eval(sch->schid);
|
|
}
|
|
|
|
/*
|
|
* Got an interrupt for a normal io (state online).
|
|
*/
|
|
static void
|
|
ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
struct irb *irb;
|
|
int is_cmd;
|
|
|
|
irb = (struct irb *)&S390_lowcore.irb;
|
|
is_cmd = !scsw_is_tm(&irb->scsw);
|
|
/* Check for unsolicited interrupt. */
|
|
if (!scsw_is_solicited(&irb->scsw)) {
|
|
if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
|
|
!irb->esw.esw0.erw.cons) {
|
|
/* Unit check but no sense data. Need basic sense. */
|
|
if (ccw_device_do_sense(cdev, irb) != 0)
|
|
goto call_handler_unsol;
|
|
memcpy(&cdev->private->irb, irb, sizeof(struct irb));
|
|
cdev->private->state = DEV_STATE_W4SENSE;
|
|
cdev->private->intparm = 0;
|
|
return;
|
|
}
|
|
call_handler_unsol:
|
|
if (cdev->handler)
|
|
cdev->handler (cdev, 0, irb);
|
|
if (cdev->private->flags.doverify)
|
|
ccw_device_online_verify(cdev, 0);
|
|
return;
|
|
}
|
|
/* Accumulate status and find out if a basic sense is needed. */
|
|
ccw_device_accumulate_irb(cdev, irb);
|
|
if (is_cmd && cdev->private->flags.dosense) {
|
|
if (ccw_device_do_sense(cdev, irb) == 0) {
|
|
cdev->private->state = DEV_STATE_W4SENSE;
|
|
}
|
|
return;
|
|
}
|
|
/* Call the handler. */
|
|
if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
|
|
/* Start delayed path verification. */
|
|
ccw_device_online_verify(cdev, 0);
|
|
}
|
|
|
|
/*
|
|
* Got an timeout in online state.
|
|
*/
|
|
static void
|
|
ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
int ret;
|
|
|
|
ccw_device_set_timeout(cdev, 0);
|
|
cdev->private->iretry = 255;
|
|
ret = ccw_device_cancel_halt_clear(cdev);
|
|
if (ret == -EBUSY) {
|
|
ccw_device_set_timeout(cdev, 3*HZ);
|
|
cdev->private->state = DEV_STATE_TIMEOUT_KILL;
|
|
return;
|
|
}
|
|
if (ret)
|
|
dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
|
|
else if (cdev->handler)
|
|
cdev->handler(cdev, cdev->private->intparm,
|
|
ERR_PTR(-ETIMEDOUT));
|
|
}
|
|
|
|
/*
|
|
* Got an interrupt for a basic sense.
|
|
*/
|
|
static void
|
|
ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
struct irb *irb;
|
|
|
|
irb = (struct irb *)&S390_lowcore.irb;
|
|
/* Check for unsolicited interrupt. */
|
|
if (scsw_stctl(&irb->scsw) ==
|
|
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
|
|
if (scsw_cc(&irb->scsw) == 1)
|
|
/* Basic sense hasn't started. Try again. */
|
|
ccw_device_do_sense(cdev, irb);
|
|
else {
|
|
CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
|
|
"interrupt during w4sense...\n",
|
|
cdev->private->dev_id.ssid,
|
|
cdev->private->dev_id.devno);
|
|
if (cdev->handler)
|
|
cdev->handler (cdev, 0, irb);
|
|
}
|
|
return;
|
|
}
|
|
/*
|
|
* Check if a halt or clear has been issued in the meanwhile. If yes,
|
|
* only deliver the halt/clear interrupt to the device driver as if it
|
|
* had killed the original request.
|
|
*/
|
|
if (scsw_fctl(&irb->scsw) &
|
|
(SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
|
|
cdev->private->flags.dosense = 0;
|
|
memset(&cdev->private->irb, 0, sizeof(struct irb));
|
|
ccw_device_accumulate_irb(cdev, irb);
|
|
goto call_handler;
|
|
}
|
|
/* Add basic sense info to irb. */
|
|
ccw_device_accumulate_basic_sense(cdev, irb);
|
|
if (cdev->private->flags.dosense) {
|
|
/* Another basic sense is needed. */
|
|
ccw_device_do_sense(cdev, irb);
|
|
return;
|
|
}
|
|
call_handler:
|
|
cdev->private->state = DEV_STATE_ONLINE;
|
|
/* In case sensing interfered with setting the device online */
|
|
wake_up(&cdev->private->wait_q);
|
|
/* Call the handler. */
|
|
if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
|
|
/* Start delayed path verification. */
|
|
ccw_device_online_verify(cdev, 0);
|
|
}
|
|
|
|
static void
|
|
ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
ccw_device_set_timeout(cdev, 0);
|
|
/* Start delayed path verification. */
|
|
ccw_device_online_verify(cdev, 0);
|
|
/* OK, i/o is dead now. Call interrupt handler. */
|
|
if (cdev->handler)
|
|
cdev->handler(cdev, cdev->private->intparm,
|
|
ERR_PTR(-EIO));
|
|
}
|
|
|
|
static void
|
|
ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
int ret;
|
|
|
|
ret = ccw_device_cancel_halt_clear(cdev);
|
|
if (ret == -EBUSY) {
|
|
ccw_device_set_timeout(cdev, 3*HZ);
|
|
return;
|
|
}
|
|
/* Start delayed path verification. */
|
|
ccw_device_online_verify(cdev, 0);
|
|
if (cdev->handler)
|
|
cdev->handler(cdev, cdev->private->intparm,
|
|
ERR_PTR(-EIO));
|
|
}
|
|
|
|
void ccw_device_kill_io(struct ccw_device *cdev)
|
|
{
|
|
int ret;
|
|
|
|
cdev->private->iretry = 255;
|
|
ret = ccw_device_cancel_halt_clear(cdev);
|
|
if (ret == -EBUSY) {
|
|
ccw_device_set_timeout(cdev, 3*HZ);
|
|
cdev->private->state = DEV_STATE_TIMEOUT_KILL;
|
|
return;
|
|
}
|
|
/* Start delayed path verification. */
|
|
ccw_device_online_verify(cdev, 0);
|
|
if (cdev->handler)
|
|
cdev->handler(cdev, cdev->private->intparm,
|
|
ERR_PTR(-EIO));
|
|
}
|
|
|
|
static void
|
|
ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
/* Start verification after current task finished. */
|
|
cdev->private->flags.doverify = 1;
|
|
}
|
|
|
|
static void
|
|
ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
|
|
/* Couldn't enable the subchannel for i/o. Sick device. */
|
|
return;
|
|
cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
|
|
ccw_device_sense_id_start(cdev);
|
|
}
|
|
|
|
void ccw_device_trigger_reprobe(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
if (cdev->private->state != DEV_STATE_DISCONNECTED)
|
|
return;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
/* Update some values. */
|
|
if (cio_update_schib(sch))
|
|
return;
|
|
/*
|
|
* The pim, pam, pom values may not be accurate, but they are the best
|
|
* we have before performing device selection :/
|
|
*/
|
|
sch->lpm = sch->schib.pmcw.pam & sch->opm;
|
|
/*
|
|
* Use the initial configuration since we can't be shure that the old
|
|
* paths are valid.
|
|
*/
|
|
io_subchannel_init_config(sch);
|
|
if (cio_commit_config(sch))
|
|
return;
|
|
|
|
/* We should also udate ssd info, but this has to wait. */
|
|
/* Check if this is another device which appeared on the same sch. */
|
|
if (sch->schib.pmcw.dev != cdev->private->dev_id.devno)
|
|
css_schedule_eval(sch->schid);
|
|
else
|
|
ccw_device_start_id(cdev, 0);
|
|
}
|
|
|
|
static void ccw_device_disabled_irq(struct ccw_device *cdev,
|
|
enum dev_event dev_event)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
/*
|
|
* An interrupt in a disabled state means a previous disable was not
|
|
* successful - should not happen, but we try to disable again.
|
|
*/
|
|
cio_disable_subchannel(sch);
|
|
}
|
|
|
|
static void
|
|
ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
retry_set_schib(cdev);
|
|
cdev->private->state = DEV_STATE_ONLINE;
|
|
dev_fsm_event(cdev, dev_event);
|
|
}
|
|
|
|
static void ccw_device_update_cmfblock(struct ccw_device *cdev,
|
|
enum dev_event dev_event)
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{
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cmf_retry_copy_block(cdev);
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cdev->private->state = DEV_STATE_ONLINE;
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dev_fsm_event(cdev, dev_event);
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}
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static void
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ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
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{
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ccw_device_set_timeout(cdev, 0);
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cdev->private->state = DEV_STATE_NOT_OPER;
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wake_up(&cdev->private->wait_q);
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}
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static void
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ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
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{
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int ret;
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ret = ccw_device_cancel_halt_clear(cdev);
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if (ret == -EBUSY) {
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ccw_device_set_timeout(cdev, HZ/10);
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} else {
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cdev->private->state = DEV_STATE_NOT_OPER;
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wake_up(&cdev->private->wait_q);
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}
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}
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/*
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* No operation action. This is used e.g. to ignore a timeout event in
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* state offline.
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*/
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static void
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ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
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{
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}
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|
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/*
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* device statemachine
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*/
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fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
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[DEV_STATE_NOT_OPER] = {
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[DEV_EVENT_NOTOPER] = ccw_device_nop,
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[DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
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[DEV_EVENT_TIMEOUT] = ccw_device_nop,
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[DEV_EVENT_VERIFY] = ccw_device_nop,
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},
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[DEV_STATE_SENSE_PGID] = {
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[DEV_EVENT_NOTOPER] = ccw_device_request_event,
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[DEV_EVENT_INTERRUPT] = ccw_device_request_event,
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[DEV_EVENT_TIMEOUT] = ccw_device_request_event,
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[DEV_EVENT_VERIFY] = ccw_device_nop,
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|
},
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[DEV_STATE_SENSE_ID] = {
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[DEV_EVENT_NOTOPER] = ccw_device_request_event,
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[DEV_EVENT_INTERRUPT] = ccw_device_request_event,
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|
[DEV_EVENT_TIMEOUT] = ccw_device_request_event,
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|
[DEV_EVENT_VERIFY] = ccw_device_nop,
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|
},
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|
[DEV_STATE_OFFLINE] = {
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|
[DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
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|
[DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
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|
[DEV_EVENT_TIMEOUT] = ccw_device_nop,
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|
[DEV_EVENT_VERIFY] = ccw_device_offline_verify,
|
|
},
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|
[DEV_STATE_VERIFY] = {
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|
[DEV_EVENT_NOTOPER] = ccw_device_request_event,
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|
[DEV_EVENT_INTERRUPT] = ccw_device_request_event,
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|
[DEV_EVENT_TIMEOUT] = ccw_device_request_event,
|
|
[DEV_EVENT_VERIFY] = ccw_device_delay_verify,
|
|
},
|
|
[DEV_STATE_ONLINE] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_irq,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
|
|
[DEV_EVENT_VERIFY] = ccw_device_online_verify,
|
|
},
|
|
[DEV_STATE_W4SENSE] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_nop,
|
|
[DEV_EVENT_VERIFY] = ccw_device_online_verify,
|
|
},
|
|
[DEV_STATE_DISBAND_PGID] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_request_event,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_request_event,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_request_event,
|
|
[DEV_EVENT_VERIFY] = ccw_device_nop,
|
|
},
|
|
[DEV_STATE_BOXED] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_nop,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_nop,
|
|
[DEV_EVENT_VERIFY] = ccw_device_boxed_verify,
|
|
},
|
|
/* states to wait for i/o completion before doing something */
|
|
[DEV_STATE_TIMEOUT_KILL] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
|
|
[DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
|
|
},
|
|
[DEV_STATE_QUIESCE] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
|
|
[DEV_EVENT_VERIFY] = ccw_device_nop,
|
|
},
|
|
/* special states for devices gone not operational */
|
|
[DEV_STATE_DISCONNECTED] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_nop,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_start_id,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_nop,
|
|
[DEV_EVENT_VERIFY] = ccw_device_start_id,
|
|
},
|
|
[DEV_STATE_DISCONNECTED_SENSE_ID] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_request_event,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_request_event,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_request_event,
|
|
[DEV_EVENT_VERIFY] = ccw_device_nop,
|
|
},
|
|
[DEV_STATE_CMFCHANGE] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
|
|
[DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
|
|
},
|
|
[DEV_STATE_CMFUPDATE] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
|
|
[DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
|
|
},
|
|
[DEV_STATE_STEAL_LOCK] = {
|
|
[DEV_EVENT_NOTOPER] = ccw_device_request_event,
|
|
[DEV_EVENT_INTERRUPT] = ccw_device_request_event,
|
|
[DEV_EVENT_TIMEOUT] = ccw_device_request_event,
|
|
[DEV_EVENT_VERIFY] = ccw_device_nop,
|
|
},
|
|
};
|
|
|
|
EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
|