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Commit 94a091cf authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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[PATCH] s390: improve memory detection logic 

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

From: Guillaume Morin <guillaume@morinfr.org>

This patch improves the memory detection logic.  It detects any amount of
holes in the memory layout up to MEMORY_CHUNK blocks of available memory.
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 564252a2
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Showing with 238 additions and 51 deletions
arch/s390/kernel/head.S
View file @ 94a091cf
......@@ -478,9 +478,80 @@ startup:basr %r13,0 # get base
mvcle %r2,%r4,0 # clear mem
jo .-4 # branch back, if not finish
l %r2,.Lrcp-.LPG1(%r13) # Read SCP forced command word
.Lservicecall:
stosm .Lpmask-.LPG1(%r13),0x01 # authorize ext interrupts
stctl %r0, %r0,.Lcr-.LPG1(%r13) # get cr0
la %r1,0x200 # set bit 22
o %r1,.Lcr-.LPG1(%r13) # or old cr0 with r1
st %r1,.Lcr-.LPG1(%r13)
lctl %r0, %r0,.Lcr-.LPG1(%r13) # load modified cr0
mvc __LC_EXT_NEW_PSW(8),.Lpcext-.LPG1(%r13) # set postcall psw
la %r1, .Lsclph-.LPG1(%r13)
a %r1,__LC_EXT_NEW_PSW+4 # set handler
st %r1,__LC_EXT_NEW_PSW+4
la %r4,_pstart-.LPG1(%r13) # %r4 is our index for sccb stuff
la %r1, .Lsccb-PARMAREA(%r4) # our sccb
.insn rre,0xb2200000,%r2,%r1 # service call
ipm %r1
srl %r1,28 # get cc code
xr %r3, %r3
chi %r1,3
be .Lfchunk-.LPG1(%r13) # leave
chi %r1,2
be .Lservicecall-.LPG1(%r13)
lpsw .Lwaitsclp-.LPG1(%r13)
.Lsclph:
lh %r1,.Lsccbr-PARMAREA(%r4)
chi %r1,0x10 # 0x0010 is the sucess code
je .Lprocsccb # let's process the sccb
chi %r1,0x1f0
bne .Lfchunk-.LPG1(%r13) # unhandled error code
c %r2, .Lrcp-.LPG1(%r13) # Did we try Read SCP forced
bne .Lfchunk-.LPG1(%r13) # if no, give up
l %r2, .Lrcp2-.LPG1(%r13) # try with Read SCP
b .Lservicecall-.LPG1(%r13)
.Lprocsccb:
lh %r1,.Lscpincr1-PARMAREA(%r4) # use this one if != 0
chi %r1,0x00
jne .Lscnd
l %r1,.Lscpincr2-PARMAREA(%r4) # otherwise use this one
.Lscnd:
xr %r3,%r3 # same logic
ic %r3,.Lscpa1-PARMAREA(%r4)
chi %r3,0x00
jne .Lcompmem
l %r3,.Lscpa2-PARMAREA(%r13)
.Lcompmem:
mr %r2,%r1 # mem in MB on 128-bit
l %r1,.Lonemb-.LPG1(%r13)
mr %r2,%r1 # mem size in bytes in %r3
b .Lfchunk-.LPG1(%r13)
.Lpmask:
.byte 0
.align 8
.Lpcext:.long 0x00080000,0x80000000
.Lcr:
.long 0x00 # place holder for cr0
.Lwaitsclp:
.long 0x020A0000
.long .Lsclph
.Lrcp:
.int 0x00120001 # Read SCP forced code
.Lrcp2:
.int 0x00020001 # Read SCP code
.Lonemb:
.int 0x100000
.Lfchunk:
#
# find memory chunks.
#
lr %r9,%r3 # end of mem
mvc __LC_PGM_NEW_PSW(8),.Lpcmem-.LPG1(%r13)
la %r1,1 # test in increments of 128KB
sll %r1,17
......@@ -488,38 +559,46 @@ startup:basr %r13,0 # get base
slr %r4,%r4 # set start of chunk to zero
slr %r5,%r5 # set end of chunk to zero
slr %r6,%r6 # set access code to zero
la %r10, MEMORY_CHUNKS # number of chunks
.Lloop:
tprot 0(%r5),0 # test protection of first byte
ipm %r7
srl %r7,28
clr %r6,%r7 # compare cc with last access code
be .Lsame-.LPG1(%r13)
clr %r4,%r5 # chunk size > 0?
be .Lsize0-.LPG1(%r13)
st %r4,0(%r3) # store start address of chunk
lr %r0,%r5
slr %r0,%r4
st %r0,4(%r3) # store size of chunk
st %r6,8(%r3) # store type of chunk
la %r3,12(%r3)
lr %r4,%r5 # set start to end
.Lsize0:
lr %r6,%r7 # set access code to last cc
b .Lchkmem-.LPG1(%r13)
.Lsame:
ar %r5,%r1 # add 128KB to end of chunk
bno .Lloop-.LPG1(%r13) # r1 < 0x80000000 -> loop
.Lchkmem: # > 2GB or tprot got a program check
clr %r4,%r5 # chunk size > 0?
be .Ldonemem-.LPG1(%r13)
be .Lchkloop-.LPG1(%r13)
st %r4,0(%r3) # store start address of chunk
lr %r0,%r5
slr %r0,%r4
st %r0,4(%r3) # store size of chunk
st %r6,8(%r3) # store type of chunk
la %r3,12(%r3)
l %r4,.Lmemsize-.LPG1(%r13) # address of variable memory_size
st %r5,0(%r4) # store last end to memory size
ahi %r10,-1 # update chunk number
.Lchkloop:
lr %r6,%r7 # set access code to last cc
# we got an exception or we're starting a new
# chunk , we must check if we should
# still try to find valid memory (if we detected
# the amount of available storage), and if we
# have chunks left
xr %r0,%r0
clr %r0,%r9 # did we detect memory?
je .Ldonemem # if not, leave
chi %r10,0 # do we have chunks left?
je .Ldonemem
alr %r5,%r1 # add 128KB to end of chunk
lr %r4,%r5 # potential new chunk
clr %r5,%r9 # should we go on?
jl .Lloop
.Ldonemem:
l %r1,.Lmemsize-.LPG1(%r13) # address of variable memory_size
st %r5,0(%r1) # store last end to memory size
l %r12,.Lmflags-.LPG1(%r13) # get address of machine_flags
#
# find out if we are running under VM
......@@ -631,6 +710,23 @@ _pstart:
.byte "root=/dev/ram0 ro"
.byte 0
.org 0x11000
.Lsccb:
.hword 0x1000 # length, one page
.byte 0x00,0x00,0x00
.byte 0x80 # variable response bit set
.Lsccbr:
.hword 0x00 # response code
.Lscpincr1:
.hword 0x00
.Lscpa1:
.byte 0x00
.fill 89,1,0
.Lscpa2:
.int 0x00
.Lscpincr2:
.quad 0x00
.fill 3984,1,0
.org 0x12000
.global _pend
_pend:
......
arch/s390/kernel/head64.S
View file @ 94a091cf
......@@ -480,12 +480,81 @@ startup:basr %r13,0 # get base
mvcle %r2,%r4,0 # clear mem
jo .-4 # branch back, if not finish
l %r2,.Lrcp-.LPG1(%r13) # Read SCP forced command word
.Lservicecall:
stosm .Lpmask-.LPG1(%r13),0x01 # authorize ext interrupts
stctg %r0,%r0,.Lcr-.LPG1(%r13) # get cr0
la %r1,0x200 # set bit 22
og %r1,.Lcr-.LPG1(%r13) # or old cr0 with r1
stg %r1,.Lcr-.LPG1(%r13)
lctlg %r0,%r0,.Lcr-.LPG1(%r13) # load modified cr0
mvc __LC_EXT_NEW_PSW(8),.Lpcmsk-.LPG1(%r13) # set postcall psw
larl %r1,.Lsclph
stg %r1,__LC_EXT_NEW_PSW+8 # set handler
larl %r4,_pstart # %r4 is our index for sccb stuff
la %r1,.Lsccb-PARMAREA(%r4) # our sccb
.insn rre,0xb2200000,%r2,%r1 # service call
ipm %r1
srl %r1,28 # get cc code
xr %r3,%r3
chi %r1,3
be .Lfchunk-.LPG1(%r13) # leave
chi %r1,2
be .Lservicecall-.LPG1(%r13)
lpsw .Lwaitsclp-.LPG1(%r13)
.Lsclph:
lh %r1,.Lsccbr-PARMAREA(%r4)
chi %r1,0x10 # 0x0010 is the sucess code
je .Lprocsccb # let's process the sccb
chi %r1,0x1f0
bne .Lfchunk-.LPG1(%r13) # unhandled error code
c %r2,.Lrcp-.LPG1(%r13) # Did we try Read SCP forced
bne .Lfchunk-.LPG1(%r13) # if no, give up
l %r2,.Lrcp2-.LPG1(%r13) # try with Read SCP
b .Lservicecall-.LPG1(%r13)
.Lprocsccb:
lh %r1,.Lscpincr1-PARMAREA(%r4) # use this one if != 0
chi %r1,0x00
jne .Lscnd
lg %r1,.Lscpincr2-PARMAREA(%r4) # otherwise use this one
.Lscnd:
xr %r3,%r3 # same logic
ic %r3,.Lscpa1-PARMAREA(%r4)
chi %r3,0x00
jne .Lcompmem
l %r3,.Lscpa2-PARMAREA(%r13)
.Lcompmem:
mlgr %r2,%r1 # mem in MB on 128-bit
l %r1,.Lonemb-.LPG1(%r13)
mlgr %r2,%r1 # mem size in bytes in %r3
b .Lfchunk-.LPG1(%r13)
.Lpmask:
.byte 0
.align 8
.Lcr:
.quad 0x00 # place holder for cr0
.Lwaitsclp:
.long 0x020A0000
.quad .Lsclph
.Lrcp:
.int 0x00120001 # Read SCP forced code
.Lrcp2:
.int 0x00020001 # Read SCP code
.Lonemb:
.int 0x100000
.Lfchunk:
# set program check new psw mask
mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
#
# find memory chunks.
#
lgr %r9,%r3 # end of mem
larl %r1,.Lchkmem # set program check address
stg %r1,__LC_PGM_NEW_PSW+8
la %r1,1 # test in increments of 128KB
......@@ -494,51 +563,51 @@ startup:basr %r13,0 # get base
slgr %r4,%r4 # set start of chunk to zero
slgr %r5,%r5 # set end of chunk to zero
slr %r6,%r6 # set access code to zero
la %r10,MEMORY_CHUNKS # number of chunks
.Lloop:
tprot 0(%r5),0 # test protection of first byte
ipm %r7
srl %r7,28
clr %r6,%r7 # compare cc with last access code
je .Lsame
clgr %r4,%r5 # chunk size > 0?
je .Lsize0
stg %r4,0(%r3) # store start address of chunk
lgr %r0,%r5
slgr %r0,%r4
stg %r0,8(%r3) # store size of chunk
st %r6,20(%r3) # store type of chunk
la %r3,24(%r3)
lgr %r4,%r5 # set start to end
larl %r8,memory_size
stg %r5,0(%r8) # store memory size
.Lsize0:
lr %r6,%r7 # set access code to last cc
j .Lchkmem
.Lsame:
algr %r5,%r1 # add 128KB to end of chunk
brc 12,.Lloop
# no need to check here,
brc 12,.Lloop # this is the same chunk
.Lchkmem: # > 16EB or tprot got a program check
clgr %r4,%r5 # chunk size > 0?
je .Ldonemem
je .Lchkloop
stg %r4,0(%r3) # store start address of chunk
lgr %r0,%r5
slgr %r0,%r4
stg %r0,8(%r3) # store size of chunk
st %r6,20(%r3) # store type of chunk
la %r3,24(%r3)
lgr %r4,%r5
larl %r8,memory_size
stg %r5,0(%r8) # store memory size
#
# Running native the HSA is located at 2GB and we will get an
# addressing exception trying to access it. We have to restart
# the scan at 2GB to find out if the machine has more than 2GB.
#
ahi %r10,-1 # update chunk number
.Lchkloop:
lr %r6,%r7 # set access code to last cc
# we got an exception or we're starting a new
# chunk , we must check if we should
# still try to find valid memory (if we detected
# the amount of available storage), and if we
# have chunks left
lghi %r4,1
sllg %r4,%r4,31
clgr %r5,%r4
jhe .Ldonemem
lgr %r5,%r4
j .Lloop
je .Lhsaskip
xr %r0, %r0
clgr %r0, %r9 # did we detect memory?
je .Ldonemem # if not, leave
chi %r10, 0 # do we have chunks left?
je .Ldonemem
.Lhsaskip:
algr %r5,%r1 # add 128KB to end of chunk
lgr %r4,%r5 # potential new chunk
clgr %r5,%r9 # should we go on?
jl .Lloop
.Ldonemem:
larl %r12,machine_flags
......@@ -640,6 +709,23 @@ _pstart:
.byte "root=/dev/ram0 ro"
.byte 0
.org 0x11000
.Lsccb:
.hword 0x1000 # length, one page
.byte 0x00,0x00,0x00
.byte 0x80 # variable response bit set
.Lsccbr:
.hword 0x00 # response code
.Lscpincr1:
.hword 0x00
.Lscpa1:
.byte 0x00
.fill 89,1,0
.Lscpa2:
.int 0x00
.Lscpincr2:
.quad 0x00
.fill 3984,1,0
.org 0x12000
.global _pend
_pend:
......
arch/s390/kernel/setup.c
View file @ 94a091cf
......@@ -53,7 +53,9 @@ unsigned int console_device = -1;
unsigned int console_irq = -1;
unsigned long memory_size = 0;
unsigned long machine_flags = 0;
struct { unsigned long addr, size, type; } memory_chunk[16] = { { 0 } };
struct {
unsigned long addr, size, type;
} memory_chunk[MEMORY_CHUNKS] = { { 0 } };
#define CHUNK_READ_WRITE 0
#define CHUNK_READ_ONLY 1
int cpus_initialized = 0;
......
arch/s390/mm/extmem.c
View file @ 94a091cf
......@@ -55,7 +55,9 @@ struct dcss_segment {
static spinlock_t dcss_lock = SPIN_LOCK_UNLOCKED;
static struct list_head dcss_list = LIST_HEAD_INIT(dcss_list);
extern struct {unsigned long addr, size, type;} memory_chunk[16];
extern struct {
unsigned long addr, size, type;
} memory_chunk[MEMORY_CHUNKS];
/*
* Create the 8 bytes, ebcdic VM segment name from
......@@ -258,16 +260,16 @@ int segment_load(char *name, int segtype, unsigned long *addr,
shared segment */
dcss_diag_query(dcss_name, &rwattr, &shattr, &segstart, &segend);
/* does segment collide with main memory? */
for (i=0; i<16; i++) {
if (memory_chunk[i].type != 0)
continue;
if (memory_chunk[i].addr > segend)
continue;
if (memory_chunk[i].addr + memory_chunk[i].size <= segstart)
continue;
spin_unlock(&dcss_lock);
return -ENOENT;
}
for (i=0; i < MEMORY_CHUNKS; i++) {
if (memory_chunk[i].type != 0)
continue;
if (memory_chunk[i].addr > segend)
continue;
if (memory_chunk[i].addr + memory_chunk[i].size <= segstart)
continue;
spin_unlock(&dcss_lock);
return -ENOENT;
}
/* or does it collide with other (loaded) segments? */
list_for_each(l, &dcss_list) {
tmp = list_entry(l, struct dcss_segment, list);
......
include/asm-s390/setup.h
View file @ 94a091cf
......@@ -12,6 +12,7 @@
#define COMMAND_LINE_SIZE 896
#define RAMDISK_ORIGIN 0x800000
#define RAMDISK_SIZE 0x800000
#define MEMORY_CHUNKS 16 /* max 0x7fff */
#ifndef __ASSEMBLY__
......
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