s390: assume diag308 set always works

diag308 set has been available for many machine generations, and
alternative reipl code paths has not been exercised and seems to be
broken without noticing for a while now. So, cleaning up all obsolete
reipl methods except currently used ones, assuming that diag308 set
always works.

Also removing not longer needed reset callbacks.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

3 files changed, 0 insertions, 249 deletions

diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 28d4ee865a1c..5130d7c67239 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -25,7 +25,6 @@
 #include <asm/irq.h>
 #include <asm/irq_regs.h>
 #include <asm/setup.h>
-#include <asm/reset.h>
 #include <asm/ipl.h>
 #include <asm/chpid.h>
 #include <asm/airq.h>
@@ -767,229 +766,6 @@ void cio_register_early_subchannels(void)
 }
 #endif /* CONFIG_CCW_CONSOLE */
 
-static int
-__disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
-{
-	int retry, cc;
-
-	cc = 0;
-	for (retry=0;retry<3;retry++) {
-		schib->pmcw.ena = 0;
-		cc = msch(schid, schib);
-		if (cc)
-			return (cc==3?-ENODEV:-EBUSY);
-		if (stsch(schid, schib) || !css_sch_is_valid(schib))
-			return -ENODEV;
-		if (!schib->pmcw.ena)
-			return 0;
-	}
-	return -EBUSY; /* uhm... */
-}
-
-static int
-__clear_io_subchannel_easy(struct subchannel_id schid)
-{
-	int retry;
-
-	if (csch(schid))
-		return -ENODEV;
-	for (retry=0;retry<20;retry++) {
-		struct tpi_info ti;
-
-		if (tpi(&ti)) {
-			tsch(ti.schid, this_cpu_ptr(&cio_irb));
-			if (schid_equal(&ti.schid, &schid))
-				return 0;
-		}
-		udelay_simple(100);
-	}
-	return -EBUSY;
-}
-
-static void __clear_chsc_subchannel_easy(void)
-{
-	/* It seems we can only wait for a bit here :/ */
-	udelay_simple(100);
-}
-
-static int pgm_check_occured;
-
-static void cio_reset_pgm_check_handler(void)
-{
-	pgm_check_occured = 1;
-}
-
-static int stsch_reset(struct subchannel_id schid, struct schib *addr)
-{
-	int rc;
-
-	pgm_check_occured = 0;
-	s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
-	rc = stsch(schid, addr);
-	s390_base_pgm_handler_fn = NULL;
-
-	/* The program check handler could have changed pgm_check_occured. */
-	barrier();
-
-	if (pgm_check_occured)
-		return -EIO;
-	else
-		return rc;
-}
-
-static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
-{
-	struct schib schib;
-
-	if (stsch_reset(schid, &schib))
-		return -ENXIO;
-	if (!schib.pmcw.ena)
-		return 0;
-	switch(__disable_subchannel_easy(schid, &schib)) {
-	case 0:
-	case -ENODEV:
-		break;
-	default: /* -EBUSY */
-		switch (schib.pmcw.st) {
-		case SUBCHANNEL_TYPE_IO:
-			if (__clear_io_subchannel_easy(schid))
-				goto out; /* give up... */
-			break;
-		case SUBCHANNEL_TYPE_CHSC:
-			__clear_chsc_subchannel_easy();
-			break;
-		default:
-			/* No default clear strategy */
-			break;
-		}
-		stsch(schid, &schib);
-		__disable_subchannel_easy(schid, &schib);
-	}
-out:
-	return 0;
-}
-
-static atomic_t chpid_reset_count;
-
-static void s390_reset_chpids_mcck_handler(void)
-{
-	struct crw crw;
-	union mci mci;
-
-	/* Check for pending channel report word. */
-	mci.val = S390_lowcore.mcck_interruption_code;
-	if (!mci.cp)
-		return;
-	/* Process channel report words. */
-	while (stcrw(&crw) == 0) {
-		/* Check for responses to RCHP. */
-		if (crw.slct && crw.rsc == CRW_RSC_CPATH)
-			atomic_dec(&chpid_reset_count);
-	}
-}
-
-#define RCHP_TIMEOUT (30 * USEC_PER_SEC)
-static void css_reset(void)
-{
-	int i, ret;
-	unsigned long long timeout;
-	struct chp_id chpid;
-
-	/* Reset subchannels. */
-	for_each_subchannel(__shutdown_subchannel_easy,  NULL);
-	/* Reset channel paths. */
-	s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
-	/* Enable channel report machine checks. */
-	__ctl_set_bit(14, 28);
-	/* Temporarily reenable machine checks. */
-	local_mcck_enable();
-	chp_id_init(&chpid);
-	for (i = 0; i <= __MAX_CHPID; i++) {
-		chpid.id = i;
-		ret = rchp(chpid);
-		if ((ret == 0) || (ret == 2))
-			/*
-			 * rchp either succeeded, or another rchp is already
-			 * in progress. In either case, we'll get a crw.
-			 */
-			atomic_inc(&chpid_reset_count);
-	}
-	/* Wait for machine check for all channel paths. */
-	timeout = get_tod_clock_fast() + (RCHP_TIMEOUT << 12);
-	while (atomic_read(&chpid_reset_count) != 0) {
-		if (get_tod_clock_fast() > timeout)
-			break;
-		cpu_relax();
-	}
-	/* Disable machine checks again. */
-	local_mcck_disable();
-	/* Disable channel report machine checks. */
-	__ctl_clear_bit(14, 28);
-	s390_base_mcck_handler_fn = NULL;
-}
-
-static struct reset_call css_reset_call = {
-	.fn = css_reset,
-};
-
-static int __init init_css_reset_call(void)
-{
-	atomic_set(&chpid_reset_count, 0);
-	register_reset_call(&css_reset_call);
-	return 0;
-}
-
-arch_initcall(init_css_reset_call);
-
-struct sch_match_id {
-	struct subchannel_id schid;
-	struct ccw_dev_id devid;
-	int rc;
-};
-
-static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
-{
-	struct schib schib;
-	struct sch_match_id *match_id = data;
-
-	if (stsch_reset(schid, &schib))
-		return -ENXIO;
-	if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
-	    (schib.pmcw.dev == match_id->devid.devno) &&
-	    (schid.ssid == match_id->devid.ssid)) {
-		match_id->schid = schid;
-		match_id->rc = 0;
-		return 1;
-	}
-	return 0;
-}
-
-static int reipl_find_schid(struct ccw_dev_id *devid,
-			    struct subchannel_id *schid)
-{
-	struct sch_match_id match_id;
-
-	match_id.devid = *devid;
-	match_id.rc = -ENODEV;
-	for_each_subchannel(__reipl_subchannel_match, &match_id);
-	if (match_id.rc == 0)
-		*schid = match_id.schid;
-	return match_id.rc;
-}
-
-extern void do_reipl_asm(__u32 schid);
-
-/* Make sure all subchannels are quiet before we re-ipl an lpar. */
-void reipl_ccw_dev(struct ccw_dev_id *devid)
-{
-	struct subchannel_id uninitialized_var(schid);
-
-	s390_reset_system();
-	if (reipl_find_schid(devid, &schid) != 0)
-		panic("IPL Device not found\n");
-	do_reipl_asm(*((__u32*)&schid));
-}
-
 /**
  * cio_tm_start_key - perform start function
  * @sch: subchannel on which to perform the start function
diff --git a/drivers/s390/cio/ioasm.c b/drivers/s390/cio/ioasm.c
index 4fa9ee1d09fa..14d328338ce2 100644
--- a/drivers/s390/cio/ioasm.c
+++ b/drivers/s390/cio/ioasm.c
@@ -183,30 +183,6 @@ int chsc(void *chsc_area)
 }
 EXPORT_SYMBOL(chsc);
 
-static inline int __rchp(struct chp_id chpid)
-{
-	register struct chp_id reg1 asm ("1") = chpid;
-	int ccode;
-
-	asm volatile(
-		"	lr	1,%1\n"
-		"	rchp\n"
-		"	ipm	%0\n"
-		"	srl	%0,28"
-		: "=d" (ccode) : "d" (reg1) : "cc");
-	return ccode;
-}
-
-int rchp(struct chp_id chpid)
-{
-	int ccode;
-
-	ccode = __rchp(chpid);
-	trace_s390_cio_rchp(chpid, ccode);
-
-	return ccode;
-}
-
 static inline int __rsch(struct subchannel_id schid)
 {
 	register struct subchannel_id reg1 asm("1") = schid;
diff --git a/drivers/s390/cio/ioasm.h b/drivers/s390/cio/ioasm.h
index 35ad4ddd61e0..4be539cb9adc 100644
--- a/drivers/s390/cio/ioasm.h
+++ b/drivers/s390/cio/ioasm.h
@@ -20,7 +20,6 @@ int ssch(struct subchannel_id schid, union orb *addr);
 int csch(struct subchannel_id schid);
 int tpi(struct tpi_info *addr);
 int chsc(void *chsc_area);
-int rchp(struct chp_id chpid);
 int rsch(struct subchannel_id schid);
 int hsch(struct subchannel_id schid);
 int xsch(struct subchannel_id schid);