Commit 8b62bc96 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky

[S390] Memory detection fixes.

VMALLOC_END on 31bit should be 0x8000000UL instead of 0x7fffffffL.
The page mask which is used to make sure memory_end is on 4MB/2MB
boundary is wrong and not needed. Therefore remove it.
Make sure a vmalloc area does also exist and work on (future)
machines with 4TB and more memory.
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent ce26a853
......@@ -177,8 +177,6 @@ startup_continue:
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
......@@ -293,7 +291,6 @@ startup_continue:
.Lpcmvpg:.long 0x00080000,0x80000000 + .Lchkmvpg
.Lpcidte:.long 0x00080000,0x80000000 + .Lchkidte
.Lpcdiag9c:.long 0x00080000,0x80000000 + .Lchkdiag9c
.Lmemsize:.long memory_size
.Lmchunk:.long memory_chunk
.Lmflags:.long machine_flags
.Lbss_bgn: .long __bss_start
......
......@@ -81,8 +81,6 @@ startup_continue:
aghi %r1,1 # size is one more than end
larl %r2,memory_chunk
stg %r1,8(%r2) # store size of chunk
larl %r2,memory_size
stg %r1,0(%r2) # set memory size
j .Ldonemem
.Lslowmemdetect:
......@@ -188,8 +186,6 @@ startup_continue:
stg %r0,8(%r3) # store size of chunk
st %r6,20(%r3) # store type of chunk
la %r3,24(%r3)
larl %r8,memory_size
stg %r5,0(%r8) # store memory size
ahi %r10,-1 # update chunk number
.Lchkloop:
lr %r6,%r7 # set access code to last cc
......
......@@ -62,7 +62,6 @@ EXPORT_SYMBOL_GPL(uaccess);
unsigned int console_mode = 0;
unsigned int console_devno = -1;
unsigned int console_irq = -1;
unsigned long memory_size = 0;
unsigned long machine_flags = 0;
struct mem_chunk memory_chunk[MEMORY_CHUNKS];
......@@ -486,6 +485,37 @@ setup_resources(void)
}
}
static void __init setup_memory_end(void)
{
unsigned long real_size, memory_size;
unsigned long max_mem, max_phys;
int i;
memory_size = real_size = 0;
max_phys = VMALLOC_END - VMALLOC_MIN_SIZE;
memory_end &= PAGE_MASK;
max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
for (i = 0; i < MEMORY_CHUNKS; i++) {
struct mem_chunk *chunk = &memory_chunk[i];
real_size = max(real_size, chunk->addr + chunk->size);
if (chunk->addr >= max_mem) {
memset(chunk, 0, sizeof(*chunk));
continue;
}
if (chunk->addr + chunk->size > max_mem)
chunk->size = max_mem - chunk->addr;
memory_size = max(memory_size, chunk->addr + chunk->size);
}
if (!memory_end)
memory_end = memory_size;
if (real_size > memory_end)
printk("More memory detected than supported. Unused: %luk\n",
(real_size - memory_end) >> 10);
}
static void __init
setup_memory(void)
{
......@@ -642,8 +672,6 @@ setup_arch(char **cmdline_p)
init_mm.end_data = (unsigned long) &_edata;
init_mm.brk = (unsigned long) &_end;
memory_end = memory_size;
if (MACHINE_HAS_MVCOS)
memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
else
......@@ -651,20 +679,7 @@ setup_arch(char **cmdline_p)
parse_early_param();
#ifndef CONFIG_64BIT
memory_end &= ~0x400000UL;
/*
* We need some free virtual space to be able to do vmalloc.
* On a machine with 2GB memory we make sure that we have at
* least 128 MB free space for vmalloc.
*/
if (memory_end > 1920*1024*1024)
memory_end = 1920*1024*1024;
#else /* CONFIG_64BIT */
memory_end &= ~0x200000UL;
#endif /* CONFIG_64BIT */
setup_memory_end();
setup_memory();
setup_resources();
setup_lowcore();
......
......@@ -110,13 +110,22 @@ extern char empty_zero_page[PAGE_SIZE];
#define VMALLOC_OFFSET (8*1024*1024)
#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) \
& ~(VMALLOC_OFFSET-1))
/*
* We need some free virtual space to be able to do vmalloc.
* VMALLOC_MIN_SIZE defines the minimum size of the vmalloc
* area. On a machine with 2GB memory we make sure that we
* have at least 128MB free space for vmalloc. On a machine
* with 4TB we make sure we have at least 1GB.
*/
#ifndef __s390x__
# define VMALLOC_END (0x7fffffffL)
#define VMALLOC_MIN_SIZE 0x8000000UL
#define VMALLOC_END 0x80000000UL
#else /* __s390x__ */
# define VMALLOC_END (0x40000000000L)
#define VMALLOC_MIN_SIZE 0x40000000UL
#define VMALLOC_END 0x40000000000UL
#endif /* __s390x__ */
/*
* A 31 bit pagetable entry of S390 has following format:
* | PFRA | | OS |
......
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