386 строки
8.5 KiB
C
386 строки
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for s390 eadm subchannels
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*
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* Copyright IBM Corp. 2012
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* Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
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*/
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#include <linux/kernel_stat.h>
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#include <linux/completion.h>
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#include <linux/workqueue.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <asm/css_chars.h>
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#include <asm/debug.h>
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#include <asm/isc.h>
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#include <asm/cio.h>
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#include <asm/scsw.h>
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#include <asm/eadm.h>
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#include "eadm_sch.h"
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#include "ioasm.h"
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#include "cio.h"
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#include "css.h"
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#include "orb.h"
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MODULE_DESCRIPTION("driver for s390 eadm subchannels");
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MODULE_LICENSE("GPL");
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#define EADM_TIMEOUT (7 * HZ)
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static DEFINE_SPINLOCK(list_lock);
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static LIST_HEAD(eadm_list);
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static debug_info_t *eadm_debug;
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#define EADM_LOG(imp, txt) do { \
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debug_text_event(eadm_debug, imp, txt); \
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} while (0)
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static void EADM_LOG_HEX(int level, void *data, int length)
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{
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debug_event(eadm_debug, level, data, length);
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}
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static void orb_init(union orb *orb)
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{
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memset(orb, 0, sizeof(union orb));
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orb->eadm.compat1 = 1;
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orb->eadm.compat2 = 1;
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orb->eadm.fmt = 1;
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orb->eadm.x = 1;
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}
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static int eadm_subchannel_start(struct subchannel *sch, struct aob *aob)
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{
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union orb *orb = &get_eadm_private(sch)->orb;
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int cc;
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orb_init(orb);
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orb->eadm.aob = (u32)__pa(aob);
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orb->eadm.intparm = (u32)(addr_t)sch;
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orb->eadm.key = PAGE_DEFAULT_KEY >> 4;
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EADM_LOG(6, "start");
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EADM_LOG_HEX(6, &sch->schid, sizeof(sch->schid));
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cc = ssch(sch->schid, orb);
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switch (cc) {
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case 0:
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sch->schib.scsw.eadm.actl |= SCSW_ACTL_START_PEND;
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break;
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case 1: /* status pending */
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case 2: /* busy */
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return -EBUSY;
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case 3: /* not operational */
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return -ENODEV;
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}
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return 0;
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}
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static int eadm_subchannel_clear(struct subchannel *sch)
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{
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int cc;
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cc = csch(sch->schid);
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if (cc)
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return -ENODEV;
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sch->schib.scsw.eadm.actl |= SCSW_ACTL_CLEAR_PEND;
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return 0;
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}
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static void eadm_subchannel_timeout(struct timer_list *t)
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{
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struct eadm_private *private = from_timer(private, t, timer);
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struct subchannel *sch = private->sch;
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spin_lock_irq(sch->lock);
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EADM_LOG(1, "timeout");
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EADM_LOG_HEX(1, &sch->schid, sizeof(sch->schid));
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if (eadm_subchannel_clear(sch))
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EADM_LOG(0, "clear failed");
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spin_unlock_irq(sch->lock);
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}
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static void eadm_subchannel_set_timeout(struct subchannel *sch, int expires)
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{
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struct eadm_private *private = get_eadm_private(sch);
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if (expires == 0)
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del_timer(&private->timer);
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else
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mod_timer(&private->timer, jiffies + expires);
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}
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static void eadm_subchannel_irq(struct subchannel *sch)
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{
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struct eadm_private *private = get_eadm_private(sch);
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struct eadm_scsw *scsw = &sch->schib.scsw.eadm;
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struct irb *irb = this_cpu_ptr(&cio_irb);
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blk_status_t error = BLK_STS_OK;
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EADM_LOG(6, "irq");
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EADM_LOG_HEX(6, irb, sizeof(*irb));
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inc_irq_stat(IRQIO_ADM);
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if ((scsw->stctl & (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))
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&& scsw->eswf == 1 && irb->esw.eadm.erw.r)
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error = BLK_STS_IOERR;
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if (scsw->fctl & SCSW_FCTL_CLEAR_FUNC)
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error = BLK_STS_TIMEOUT;
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eadm_subchannel_set_timeout(sch, 0);
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if (private->state != EADM_BUSY) {
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EADM_LOG(1, "irq unsol");
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EADM_LOG_HEX(1, irb, sizeof(*irb));
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private->state = EADM_NOT_OPER;
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css_sched_sch_todo(sch, SCH_TODO_EVAL);
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return;
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}
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scm_irq_handler((struct aob *)(unsigned long)scsw->aob, error);
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private->state = EADM_IDLE;
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if (private->completion)
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complete(private->completion);
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}
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static struct subchannel *eadm_get_idle_sch(void)
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{
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struct eadm_private *private;
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struct subchannel *sch;
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unsigned long flags;
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spin_lock_irqsave(&list_lock, flags);
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list_for_each_entry(private, &eadm_list, head) {
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sch = private->sch;
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spin_lock(sch->lock);
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if (private->state == EADM_IDLE) {
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private->state = EADM_BUSY;
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list_move_tail(&private->head, &eadm_list);
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spin_unlock(sch->lock);
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spin_unlock_irqrestore(&list_lock, flags);
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return sch;
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}
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spin_unlock(sch->lock);
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}
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spin_unlock_irqrestore(&list_lock, flags);
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return NULL;
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}
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int eadm_start_aob(struct aob *aob)
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{
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struct eadm_private *private;
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struct subchannel *sch;
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unsigned long flags;
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int ret;
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sch = eadm_get_idle_sch();
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if (!sch)
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return -EBUSY;
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spin_lock_irqsave(sch->lock, flags);
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eadm_subchannel_set_timeout(sch, EADM_TIMEOUT);
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ret = eadm_subchannel_start(sch, aob);
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if (!ret)
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goto out_unlock;
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/* Handle start subchannel failure. */
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eadm_subchannel_set_timeout(sch, 0);
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private = get_eadm_private(sch);
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private->state = EADM_NOT_OPER;
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css_sched_sch_todo(sch, SCH_TODO_EVAL);
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out_unlock:
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spin_unlock_irqrestore(sch->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(eadm_start_aob);
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static int eadm_subchannel_probe(struct subchannel *sch)
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{
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struct eadm_private *private;
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int ret;
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private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
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if (!private)
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return -ENOMEM;
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INIT_LIST_HEAD(&private->head);
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timer_setup(&private->timer, eadm_subchannel_timeout, 0);
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spin_lock_irq(sch->lock);
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set_eadm_private(sch, private);
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private->state = EADM_IDLE;
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private->sch = sch;
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sch->isc = EADM_SCH_ISC;
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ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
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if (ret) {
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set_eadm_private(sch, NULL);
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spin_unlock_irq(sch->lock);
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kfree(private);
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goto out;
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}
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spin_unlock_irq(sch->lock);
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spin_lock_irq(&list_lock);
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list_add(&private->head, &eadm_list);
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spin_unlock_irq(&list_lock);
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out:
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return ret;
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}
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static void eadm_quiesce(struct subchannel *sch)
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{
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struct eadm_private *private = get_eadm_private(sch);
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DECLARE_COMPLETION_ONSTACK(completion);
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int ret;
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spin_lock_irq(sch->lock);
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if (private->state != EADM_BUSY)
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goto disable;
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if (eadm_subchannel_clear(sch))
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goto disable;
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private->completion = &completion;
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spin_unlock_irq(sch->lock);
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wait_for_completion_io(&completion);
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spin_lock_irq(sch->lock);
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private->completion = NULL;
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disable:
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eadm_subchannel_set_timeout(sch, 0);
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do {
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ret = cio_disable_subchannel(sch);
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} while (ret == -EBUSY);
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spin_unlock_irq(sch->lock);
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}
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static void eadm_subchannel_remove(struct subchannel *sch)
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{
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struct eadm_private *private = get_eadm_private(sch);
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spin_lock_irq(&list_lock);
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list_del(&private->head);
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spin_unlock_irq(&list_lock);
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eadm_quiesce(sch);
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spin_lock_irq(sch->lock);
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set_eadm_private(sch, NULL);
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spin_unlock_irq(sch->lock);
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kfree(private);
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}
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static void eadm_subchannel_shutdown(struct subchannel *sch)
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{
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eadm_quiesce(sch);
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}
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/**
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* eadm_subchannel_sch_event - process subchannel event
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* @sch: subchannel
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* @process: non-zero if function is called in process context
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*
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* An unspecified event occurred for this subchannel. Adjust data according
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* to the current operational state of the subchannel. Return zero when the
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* event has been handled sufficiently or -EAGAIN when this function should
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* be called again in process context.
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*/
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static int eadm_subchannel_sch_event(struct subchannel *sch, int process)
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{
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struct eadm_private *private;
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unsigned long flags;
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spin_lock_irqsave(sch->lock, flags);
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if (!device_is_registered(&sch->dev))
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goto out_unlock;
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if (work_pending(&sch->todo_work))
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goto out_unlock;
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if (cio_update_schib(sch)) {
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css_sched_sch_todo(sch, SCH_TODO_UNREG);
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goto out_unlock;
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}
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private = get_eadm_private(sch);
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if (private->state == EADM_NOT_OPER)
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private->state = EADM_IDLE;
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out_unlock:
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spin_unlock_irqrestore(sch->lock, flags);
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return 0;
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}
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static struct css_device_id eadm_subchannel_ids[] = {
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{ .match_flags = 0x1, .type = SUBCHANNEL_TYPE_ADM, },
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{ /* end of list */ },
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};
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MODULE_DEVICE_TABLE(css, eadm_subchannel_ids);
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static struct css_driver eadm_subchannel_driver = {
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.drv = {
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.name = "eadm_subchannel",
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.owner = THIS_MODULE,
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},
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.subchannel_type = eadm_subchannel_ids,
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.irq = eadm_subchannel_irq,
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.probe = eadm_subchannel_probe,
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.remove = eadm_subchannel_remove,
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.shutdown = eadm_subchannel_shutdown,
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.sch_event = eadm_subchannel_sch_event,
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};
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static int __init eadm_sch_init(void)
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{
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int ret;
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if (!css_general_characteristics.eadm)
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return -ENXIO;
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eadm_debug = debug_register("eadm_log", 16, 1, 16);
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if (!eadm_debug)
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return -ENOMEM;
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debug_register_view(eadm_debug, &debug_hex_ascii_view);
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debug_set_level(eadm_debug, 2);
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isc_register(EADM_SCH_ISC);
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ret = css_driver_register(&eadm_subchannel_driver);
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if (ret)
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goto cleanup;
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return ret;
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cleanup:
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isc_unregister(EADM_SCH_ISC);
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debug_unregister(eadm_debug);
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return ret;
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}
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static void __exit eadm_sch_exit(void)
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{
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css_driver_unregister(&eadm_subchannel_driver);
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isc_unregister(EADM_SCH_ISC);
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debug_unregister(eadm_debug);
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}
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module_init(eadm_sch_init);
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module_exit(eadm_sch_exit);
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