Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Driver for s390 eadm subchannels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright IBM Corp. 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/kernel_stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/css_chars.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/isc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/cio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/scsw.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/eadm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include "eadm_sch.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include "ioasm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include "cio.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include "css.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include "orb.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) MODULE_DESCRIPTION("driver for s390 eadm subchannels");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define EADM_TIMEOUT (7 * HZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static DEFINE_SPINLOCK(list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static LIST_HEAD(eadm_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static debug_info_t *eadm_debug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #define EADM_LOG(imp, txt) do {					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		debug_text_event(eadm_debug, imp, txt);		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	} while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static void EADM_LOG_HEX(int level, void *data, int length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	debug_event(eadm_debug, level, data, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static void orb_init(union orb *orb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	memset(orb, 0, sizeof(union orb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	orb->eadm.compat1 = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	orb->eadm.compat2 = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	orb->eadm.fmt = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	orb->eadm.x = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static int eadm_subchannel_start(struct subchannel *sch, struct aob *aob)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	union orb *orb = &get_eadm_private(sch)->orb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	orb_init(orb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	orb->eadm.aob = (u32)__pa(aob);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	orb->eadm.intparm = (u32)(addr_t)sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	orb->eadm.key = PAGE_DEFAULT_KEY >> 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	EADM_LOG(6, "start");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	EADM_LOG_HEX(6, &sch->schid, sizeof(sch->schid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	cc = ssch(sch->schid, orb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	switch (cc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		sch->schib.scsw.eadm.actl |= SCSW_ACTL_START_PEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	case 1:		/* status pending */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	case 2:		/* busy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	case 3:		/* not operational */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) static int eadm_subchannel_clear(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	cc = csch(sch->schid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	if (cc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	sch->schib.scsw.eadm.actl |= SCSW_ACTL_CLEAR_PEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) static void eadm_subchannel_timeout(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct eadm_private *private = from_timer(private, t, timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	struct subchannel *sch = private->sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	spin_lock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	EADM_LOG(1, "timeout");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	EADM_LOG_HEX(1, &sch->schid, sizeof(sch->schid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (eadm_subchannel_clear(sch))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		EADM_LOG(0, "clear failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	spin_unlock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static void eadm_subchannel_set_timeout(struct subchannel *sch, int expires)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	struct eadm_private *private = get_eadm_private(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (expires == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		del_timer(&private->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (timer_pending(&private->timer)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		if (mod_timer(&private->timer, jiffies + expires))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	private->timer.expires = jiffies + expires;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	add_timer(&private->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static void eadm_subchannel_irq(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	struct eadm_private *private = get_eadm_private(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	struct eadm_scsw *scsw = &sch->schib.scsw.eadm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	struct irb *irb = this_cpu_ptr(&cio_irb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	blk_status_t error = BLK_STS_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	EADM_LOG(6, "irq");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	EADM_LOG_HEX(6, irb, sizeof(*irb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	inc_irq_stat(IRQIO_ADM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	if ((scsw->stctl & (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	    && scsw->eswf == 1 && irb->esw.eadm.erw.r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		error = BLK_STS_IOERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (scsw->fctl & SCSW_FCTL_CLEAR_FUNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		error = BLK_STS_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	eadm_subchannel_set_timeout(sch, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (private->state != EADM_BUSY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		EADM_LOG(1, "irq unsol");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		EADM_LOG_HEX(1, irb, sizeof(*irb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		private->state = EADM_NOT_OPER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		css_sched_sch_todo(sch, SCH_TODO_EVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	scm_irq_handler((struct aob *)(unsigned long)scsw->aob, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	private->state = EADM_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (private->completion)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		complete(private->completion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static struct subchannel *eadm_get_idle_sch(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	struct eadm_private *private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	struct subchannel *sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	spin_lock_irqsave(&list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	list_for_each_entry(private, &eadm_list, head) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		sch = private->sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		spin_lock(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		if (private->state == EADM_IDLE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			private->state = EADM_BUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 			list_move_tail(&private->head, &eadm_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			spin_unlock(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			spin_unlock_irqrestore(&list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			return sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		spin_unlock(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	spin_unlock_irqrestore(&list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) int eadm_start_aob(struct aob *aob)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	struct eadm_private *private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	struct subchannel *sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	sch = eadm_get_idle_sch();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (!sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	spin_lock_irqsave(sch->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	eadm_subchannel_set_timeout(sch, EADM_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	ret = eadm_subchannel_start(sch, aob);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	/* Handle start subchannel failure. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	eadm_subchannel_set_timeout(sch, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	private = get_eadm_private(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	private->state = EADM_NOT_OPER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	css_sched_sch_todo(sch, SCH_TODO_EVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	spin_unlock_irqrestore(sch->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) EXPORT_SYMBOL_GPL(eadm_start_aob);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static int eadm_subchannel_probe(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	struct eadm_private *private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	if (!private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	INIT_LIST_HEAD(&private->head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	timer_setup(&private->timer, eadm_subchannel_timeout, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	spin_lock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	set_eadm_private(sch, private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	private->state = EADM_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	private->sch = sch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	sch->isc = EADM_SCH_ISC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		set_eadm_private(sch, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		spin_unlock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		kfree(private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	spin_unlock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	spin_lock_irq(&list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	list_add(&private->head, &eadm_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	spin_unlock_irq(&list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (dev_get_uevent_suppress(&sch->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		dev_set_uevent_suppress(&sch->dev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static void eadm_quiesce(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	struct eadm_private *private = get_eadm_private(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	DECLARE_COMPLETION_ONSTACK(completion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	spin_lock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	if (private->state != EADM_BUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		goto disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (eadm_subchannel_clear(sch))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		goto disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	private->completion = &completion;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	spin_unlock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	wait_for_completion_io(&completion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	spin_lock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	private->completion = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) disable:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	eadm_subchannel_set_timeout(sch, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		ret = cio_disable_subchannel(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	} while (ret == -EBUSY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	spin_unlock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static int eadm_subchannel_remove(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	struct eadm_private *private = get_eadm_private(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	spin_lock_irq(&list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	list_del(&private->head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	spin_unlock_irq(&list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	eadm_quiesce(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	spin_lock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	set_eadm_private(sch, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	spin_unlock_irq(sch->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	kfree(private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static void eadm_subchannel_shutdown(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	eadm_quiesce(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) static int eadm_subchannel_freeze(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	return cio_disable_subchannel(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static int eadm_subchannel_restore(struct subchannel *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)  * eadm_subchannel_sch_event - process subchannel event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)  * @sch: subchannel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)  * @process: non-zero if function is called in process context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)  * An unspecified event occurred for this subchannel. Adjust data according
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)  * to the current operational state of the subchannel. Return zero when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)  * event has been handled sufficiently or -EAGAIN when this function should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)  * be called again in process context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) static int eadm_subchannel_sch_event(struct subchannel *sch, int process)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	struct eadm_private *private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	spin_lock_irqsave(sch->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	if (!device_is_registered(&sch->dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	if (work_pending(&sch->todo_work))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	if (cio_update_schib(sch)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		css_sched_sch_todo(sch, SCH_TODO_UNREG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	private = get_eadm_private(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	if (private->state == EADM_NOT_OPER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		private->state = EADM_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	spin_unlock_irqrestore(sch->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) static struct css_device_id eadm_subchannel_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	{ .match_flags = 0x1, .type = SUBCHANNEL_TYPE_ADM, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	{ /* end of list */ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) MODULE_DEVICE_TABLE(css, eadm_subchannel_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) static struct css_driver eadm_subchannel_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	.drv = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		.name = "eadm_subchannel",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	.subchannel_type = eadm_subchannel_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	.irq = eadm_subchannel_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	.probe = eadm_subchannel_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	.remove = eadm_subchannel_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	.shutdown = eadm_subchannel_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	.sch_event = eadm_subchannel_sch_event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	.freeze = eadm_subchannel_freeze,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	.thaw = eadm_subchannel_restore,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	.restore = eadm_subchannel_restore,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) static int __init eadm_sch_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	if (!css_general_characteristics.eadm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	eadm_debug = debug_register("eadm_log", 16, 1, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	if (!eadm_debug)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	debug_register_view(eadm_debug, &debug_hex_ascii_view);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	debug_set_level(eadm_debug, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	isc_register(EADM_SCH_ISC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	ret = css_driver_register(&eadm_subchannel_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	isc_unregister(EADM_SCH_ISC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	debug_unregister(eadm_debug);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) static void __exit eadm_sch_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	css_driver_unregister(&eadm_subchannel_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	isc_unregister(EADM_SCH_ISC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	debug_unregister(eadm_debug);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) module_init(eadm_sch_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) module_exit(eadm_sch_exit);