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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>
This commit is contained in:
Gerald Schaefer 2019-02-21 15:34:21 +01:00 committed by Martin Schwidefsky
parent ebb7c695d3
commit ca57114609
1 changed files with 12 additions and 117 deletions
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129
arch/s390/mm/extmem.c
View File

@ -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);