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1128 lines
31 KiB
1128 lines
31 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 ([email protected]) |
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* Martin Schwidefsky ([email protected]) |
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*/ |
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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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|
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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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|
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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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|
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static int timeout_log_enabled; |
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|
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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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|
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__setup("ccw_timeout_log", ccw_timeout_log_setup); |
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|
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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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|
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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(sch->schid, &schib); |
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|
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printk(KERN_WARNING "cio: ccw device timeout occurred at %lx, " |
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"device information:\n", get_tod_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 == |
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&private->dma_area->sense_ccw || |
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(void *)(addr_t)orb->cmd.cpa == |
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cdev->private->dma_area->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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/* |
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* Timeout function. It just triggers a DEV_EVENT_TIMEOUT. |
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*/ |
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void |
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ccw_device_timeout(struct timer_list *t) |
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{ |
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struct ccw_device_private *priv = from_timer(priv, t, timer); |
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struct ccw_device *cdev = priv->cdev; |
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|
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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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/* |
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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.expires = jiffies + expires; |
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add_timer(&cdev->private->timer); |
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} |
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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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|
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sch = to_subchannel(cdev->dev.parent); |
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ret = cio_cancel_halt_clear(sch, &cdev->private->iretry); |
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|
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if (ret == -EIO) |
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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, |
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cdev->private->dev_id.devno); |
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|
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return ret; |
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} |
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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->dma_area->senseid.cu_type; |
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cdev->id.cu_model = cdev->private->dma_area->senseid.cu_model; |
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cdev->id.dev_type = cdev->private->dma_area->senseid.dev_type; |
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cdev->id.dev_model = cdev->private->dma_area->senseid.dev_model; |
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} |
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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 == |
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cdev->private->dma_area->senseid.cu_type && |
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cdev->id.cu_model == |
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cdev->private->dma_area->senseid.cu_model && |
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cdev->id.dev_type == |
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cdev->private->dma_area->senseid.dev_type && |
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cdev->id.dev_model == |
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cdev->private->dma_area->senseid.dev_model; |
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} |
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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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|
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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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/* |
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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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|
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sch = to_subchannel(cdev->dev.parent); |
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|
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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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|
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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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|
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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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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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/* |
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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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/** |
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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->dma_area->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, |
|
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; |
|
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; |
|
break; |
|
default: |
|
break; |
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} |
|
|
|
if (cdev->private->flags.donotify) { |
|
cdev->private->flags.donotify = 0; |
|
ccw_device_oper_notify(cdev); |
|
} |
|
wake_up(&cdev->private->wait_q); |
|
} |
|
|
|
/* |
|
* Start device recognition. |
|
*/ |
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void ccw_device_recognition(struct ccw_device *cdev) |
|
{ |
|
struct subchannel *sch = to_subchannel(cdev->dev.parent); |
|
|
|
/* |
|
* We used to start here with a sense pgid to find out whether a device |
|
* is locked by someone else. Unfortunately, the sense pgid command |
|
* code has other meanings on devices predating the path grouping |
|
* algorithm, so we start with sense id and box the device after an |
|
* timeout (or if sense pgid during path verification detects the device |
|
* is locked, as may happen on newer devices). |
|
*/ |
|
cdev->private->flags.recog_done = 0; |
|
cdev->private->state = DEV_STATE_SENSE_ID; |
|
if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) { |
|
ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); |
|
return; |
|
} |
|
ccw_device_sense_id_start(cdev); |
|
} |
|
|
|
/* |
|
* Handle events for states that use the ccw request infrastructure. |
|
*/ |
|
static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e) |
|
{ |
|
switch (e) { |
|
case DEV_EVENT_NOTOPER: |
|
ccw_request_notoper(cdev); |
|
break; |
|
case DEV_EVENT_INTERRUPT: |
|
ccw_request_handler(cdev); |
|
break; |
|
case DEV_EVENT_TIMEOUT: |
|
ccw_request_timeout(cdev); |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
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; |
|
} |
|
|
|
static void create_fake_irb(struct irb *irb, int type) |
|
{ |
|
memset(irb, 0, sizeof(*irb)); |
|
if (type == FAKE_CMD_IRB) { |
|
struct cmd_scsw *scsw = &irb->scsw.cmd; |
|
scsw->cc = 1; |
|
scsw->fctl = SCSW_FCTL_START_FUNC; |
|
scsw->actl = SCSW_ACTL_START_PEND; |
|
scsw->stctl = SCSW_STCTL_STATUS_PEND; |
|
} else if (type == FAKE_TM_IRB) { |
|
struct tm_scsw *scsw = &irb->scsw.tm; |
|
scsw->x = 1; |
|
scsw->cc = 1; |
|
scsw->fctl = SCSW_FCTL_START_FUNC; |
|
scsw->actl = SCSW_ACTL_START_PEND; |
|
scsw->stctl = SCSW_STCTL_STATUS_PEND; |
|
} |
|
} |
|
|
|
static void ccw_device_handle_broken_paths(struct ccw_device *cdev) |
|
{ |
|
struct subchannel *sch = to_subchannel(cdev->dev.parent); |
|
u8 broken_paths = (sch->schib.pmcw.pam & sch->opm) ^ sch->vpm; |
|
|
|
if (broken_paths && (cdev->private->path_broken_mask != broken_paths)) |
|
ccw_device_schedule_recovery(); |
|
|
|
cdev->private->path_broken_mask = broken_paths; |
|
} |
|
|
|
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) { |
|
create_fake_irb(&cdev->private->dma_area->irb, |
|
cdev->private->flags.fake_irb); |
|
cdev->private->flags.fake_irb = 0; |
|
if (cdev->handler) |
|
cdev->handler(cdev, cdev->private->intparm, |
|
&cdev->private->dma_area->irb); |
|
memset(&cdev->private->dma_area->irb, 0, |
|
sizeof(struct irb)); |
|
} |
|
ccw_device_report_path_events(cdev); |
|
ccw_device_handle_broken_paths(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->dma_area->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); |
|
} |
|
|
|
/* |
|
* Pass interrupt to device driver. |
|
*/ |
|
static int ccw_device_call_handler(struct ccw_device *cdev) |
|
{ |
|
unsigned int stctl; |
|
int ending_status; |
|
|
|
/* |
|
* we allow for the device action handler if . |
|
* - we received ending status |
|
* - the action handler requested to see all interrupts |
|
* - we received an intermediate status |
|
* - fast notification was requested (primary status) |
|
* - unsolicited interrupts |
|
*/ |
|
stctl = scsw_stctl(&cdev->private->dma_area->irb.scsw); |
|
ending_status = (stctl & SCSW_STCTL_SEC_STATUS) || |
|
(stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) || |
|
(stctl == SCSW_STCTL_STATUS_PEND); |
|
if (!ending_status && |
|
!cdev->private->options.repall && |
|
!(stctl & SCSW_STCTL_INTER_STATUS) && |
|
!(cdev->private->options.fast && |
|
(stctl & SCSW_STCTL_PRIM_STATUS))) |
|
return 0; |
|
|
|
if (ending_status) |
|
ccw_device_set_timeout(cdev, 0); |
|
|
|
if (cdev->handler) |
|
cdev->handler(cdev, cdev->private->intparm, |
|
&cdev->private->dma_area->irb); |
|
|
|
memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb)); |
|
return 1; |
|
} |
|
|
|
/* |
|
* 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 = this_cpu_ptr(&cio_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->dma_area->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; |
|
cdev->private->async_kill_io_rc = -ETIMEDOUT; |
|
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 = this_cpu_ptr(&cio_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->dma_area->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(cdev->private->async_kill_io_rc)); |
|
} |
|
|
|
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(cdev->private->async_kill_io_rc)); |
|
} |
|
|
|
void ccw_device_kill_io(struct ccw_device *cdev) |
|
{ |
|
int ret; |
|
|
|
ccw_device_set_timeout(cdev, 0); |
|
cdev->private->iretry = 255; |
|
cdev->private->async_kill_io_rc = -EIO; |
|
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) |
|
{ |
|
cmf_retry_copy_block(cdev); |
|
cdev->private->state = DEV_STATE_ONLINE; |
|
dev_fsm_event(cdev, dev_event); |
|
} |
|
|
|
static void |
|
ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) |
|
{ |
|
ccw_device_set_timeout(cdev, 0); |
|
cdev->private->state = DEV_STATE_NOT_OPER; |
|
wake_up(&cdev->private->wait_q); |
|
} |
|
|
|
static void |
|
ccw_device_quiesce_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, HZ/10); |
|
} else { |
|
cdev->private->state = DEV_STATE_NOT_OPER; |
|
wake_up(&cdev->private->wait_q); |
|
} |
|
} |
|
|
|
/* |
|
* No operation action. This is used e.g. to ignore a timeout event in |
|
* state offline. |
|
*/ |
|
static void |
|
ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) |
|
{ |
|
} |
|
|
|
/* |
|
* device statemachine |
|
*/ |
|
fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { |
|
[DEV_STATE_NOT_OPER] = { |
|
[DEV_EVENT_NOTOPER] = ccw_device_nop, |
|
[DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, |
|
[DEV_EVENT_TIMEOUT] = ccw_device_nop, |
|
[DEV_EVENT_VERIFY] = ccw_device_nop, |
|
}, |
|
[DEV_STATE_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_OFFLINE] = { |
|
[DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
|
[DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, |
|
[DEV_EVENT_TIMEOUT] = ccw_device_nop, |
|
[DEV_EVENT_VERIFY] = ccw_device_offline_verify, |
|
}, |
|
[DEV_STATE_VERIFY] = { |
|
[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_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, |
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[DEV_EVENT_INTERRUPT] = ccw_device_nop, |
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[DEV_EVENT_TIMEOUT] = ccw_device_nop, |
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[DEV_EVENT_VERIFY] = ccw_device_boxed_verify, |
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}, |
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/* states to wait for i/o completion before doing something */ |
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[DEV_STATE_TIMEOUT_KILL] = { |
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[DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
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[DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
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[DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, |
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[DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME |
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}, |
|
[DEV_STATE_QUIESCE] = { |
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[DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, |
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[DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, |
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[DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, |
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[DEV_EVENT_VERIFY] = ccw_device_nop, |
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}, |
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/* special states for devices gone not operational */ |
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[DEV_STATE_DISCONNECTED] = { |
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[DEV_EVENT_NOTOPER] = ccw_device_nop, |
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[DEV_EVENT_INTERRUPT] = ccw_device_start_id, |
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[DEV_EVENT_TIMEOUT] = ccw_device_nop, |
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[DEV_EVENT_VERIFY] = ccw_device_start_id, |
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}, |
|
[DEV_STATE_DISCONNECTED_SENSE_ID] = { |
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[DEV_EVENT_NOTOPER] = ccw_device_request_event, |
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[DEV_EVENT_INTERRUPT] = ccw_device_request_event, |
|
[DEV_EVENT_TIMEOUT] = ccw_device_request_event, |
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[DEV_EVENT_VERIFY] = ccw_device_nop, |
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}, |
|
[DEV_STATE_CMFCHANGE] = { |
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[DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, |
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[DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, |
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[DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, |
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[DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, |
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}, |
|
[DEV_STATE_CMFUPDATE] = { |
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[DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, |
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[DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, |
|
[DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, |
|
[DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, |
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}, |
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[DEV_STATE_STEAL_LOCK] = { |
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[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);
|
|
|