s390/extmem: remove code for 31 bit addressing mode

All supported releases of z/VM allow 64 bit subcodes and addressing mode
for diag 0x64.

This patch removes a lot of code for handling 31 bit addressing mode and
old subcodes.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/mm/extmem.c

@@ -28,12 +28,7 @@
 #include <asm/cpcmd.h>
 #include <asm/setup.h>
 
-#define DCSS_LOADSHR    0x00
-#define DCSS_LOADNSR    0x04
 #define DCSS_PURGESEG   0x08
-#define DCSS_FINDSEG    0x0c
-#define DCSS_LOADNOLY   0x10
-#define DCSS_SEGEXT     0x18
 #define DCSS_LOADSHRX	0x20
 #define DCSS_LOADNSRX	0x24
 #define DCSS_FINDSEGX	0x2c
@@ -53,20 +48,6 @@ struct qout64 {
 	struct qrange range[6];
 };
 
-struct qrange_old {
-	unsigned int start; /* last byte type */
-	unsigned int end;   /* last byte reserved */
-};
-
-/* output area format for the Diag x'64' old subcode x'18' */
-struct qout64_old {
-	int segstart;
-	int segend;
-	int segcnt;
-	int segrcnt;
-	struct qrange_old range[6];
-};
-
 struct qin64 {
 	char qopcode;
 	char rsrv1[3];
@@ -95,52 +76,10 @@ static DEFINE_MUTEX(dcss_lock);
 static LIST_HEAD(dcss_list);
 static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
 					"EW/EN-MIXED" };
-static int loadshr_scode, loadnsr_scode;
-static int segext_scode, purgeseg_scode;
-static int scode_set;
-
-/* set correct Diag x'64' subcodes. */
-static int
-dcss_set_subcodes(void)
-{
-	char *name = kmalloc(8, GFP_KERNEL | GFP_DMA);
-	unsigned long rx, ry;
-	int rc;
-
-	if (name == NULL)
-		return -ENOMEM;
-
-	rx = (unsigned long) name;
-	ry = DCSS_FINDSEGX;
-
-	strcpy(name, "dummy");
-	diag_stat_inc(DIAG_STAT_X064);
-	asm volatile(
-		"	diag	%0,%1,0x64\n"
-		"0:	ipm	%2\n"
-		"	srl	%2,28\n"
-		"	j	2f\n"
-		"1:	la	%2,3\n"
-		"2:\n"
-		EX_TABLE(0b, 1b)
-		: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc", "memory");
-
-	kfree(name);
-	/* Diag x'64' new subcodes are supported, set to new subcodes */
-	if (rc != 3) {
-		loadshr_scode = DCSS_LOADSHRX;
-		loadnsr_scode = DCSS_LOADNSRX;
-		purgeseg_scode = DCSS_PURGESEG;
-		segext_scode = DCSS_SEGEXTX;
-		return 0;
-	}
-	/* Diag x'64' new subcodes are not supported, set to old subcodes */
-	loadshr_scode = DCSS_LOADNOLY;
-	loadnsr_scode = DCSS_LOADNSR;
-	purgeseg_scode = DCSS_PURGESEG;
-	segext_scode = DCSS_SEGEXT;
-	return 0;
-}
+static int loadshr_scode = DCSS_LOADSHRX;
+static int loadnsr_scode = DCSS_LOADNSRX;
+static int purgeseg_scode = DCSS_PURGESEG;
+static int segext_scode = DCSS_SEGEXTX;
 
 /*
  * Create the 8 bytes, ebcdic VM segment name from
@@ -196,32 +135,15 @@ dcss_diag(int *func, void *parameter,
 	unsigned long rx, ry;
 	int rc;
 
-	if (scode_set == 0) {
-		rc = dcss_set_subcodes();
-		if (rc < 0)
-			return rc;
-		scode_set = 1;
-	}
 	rx = (unsigned long) parameter;
 	ry = (unsigned long) *func;
 
-	/* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
 	diag_stat_inc(DIAG_STAT_X064);
-	if (*func > DCSS_SEGEXT)
-		asm volatile(
-			"	diag	%0,%1,0x64\n"
-			"	ipm	%2\n"
-			"	srl	%2,28\n"
-			: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
-	/* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
-	else
-		asm volatile(
-			"	sam31\n"
-			"	diag	%0,%1,0x64\n"
-			"	sam64\n"
-			"	ipm	%2\n"
-			"	srl	%2,28\n"
-			: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
+	asm volatile(
+		"	diag	%0,%1,0x64\n"
+		"	ipm	%2\n"
+		"	srl	%2,28\n"
+		: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
 	*ret1 = rx;
 	*ret2 = ry;
 	return rc;
@@ -271,31 +193,6 @@ query_segment_type (struct dcss_segment *seg)
 		goto out_free;
 	}
 
-	/* Only old format of output area of Diagnose x'64' is supported,
-	   copy data for the new format. */
-	if (segext_scode == DCSS_SEGEXT) {
-		struct qout64_old *qout_old;
-		qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
-		if (qout_old == NULL) {
-			rc = -ENOMEM;
-			goto out_free;
-		}
-		memcpy(qout_old, qout, sizeof(struct qout64_old));
-		qout->segstart = (unsigned long) qout_old->segstart;
-		qout->segend = (unsigned long) qout_old->segend;
-		qout->segcnt = qout_old->segcnt;
-		qout->segrcnt = qout_old->segrcnt;
-
-		if (qout->segcnt > 6)
-			qout->segrcnt = 6;
-		for (i = 0; i < qout->segrcnt; i++) {
-			qout->range[i].start =
-				(unsigned long) qout_old->range[i].start;
-			qout->range[i].end =
-				(unsigned long) qout_old->range[i].end;
-		}
-		kfree(qout_old);
-	}
 	if (qout->segcnt > 6) {
 		rc = -EOPNOTSUPP;
 		goto out_free;
@@ -410,11 +307,9 @@ __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long
 	if (rc < 0)
 		goto out_free;
 
-	if (loadshr_scode == DCSS_LOADSHRX) {
-		if (segment_overlaps_others(seg)) {
-			rc = -EBUSY;
-			goto out_free;
-		}
+	if (segment_overlaps_others(seg)) {
+		rc = -EBUSY;
+		goto out_free;
 	}
 
 	rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);