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SPARC64: SPARSEMEM_VMEMMAP support

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[apw@shadowen.org: style fixups]
[apw@shadowen.org: vmemmap sparc64: convert to new config options]
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Christoph Lameter <clameter@sgi.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Miller 2007-10-16 01:24:16 -07:00 committed by Linus Torvalds
parent ef229c5a5e
commit 46644c2477
4 changed files with 72 additions and 1 deletions
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2
arch/sparc64/Kconfig
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@ -240,10 +240,10 @@ config ARCH_SELECT_MEMORY_MODEL
config ARCH_SPARSEMEM_ENABLE
def_bool y
select SPARSEMEM_VMEMMAP_ENABLE
config ARCH_SPARSEMEM_DEFAULT
def_bool y
select SPARSEMEM_STATIC
source "mm/Kconfig"

16
arch/sparc64/kernel/ktlb.S
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@ -226,6 +226,15 @@ kvmap_dtlb_load:
ba,pt %xcc, sun4v_dtlb_load
mov %g5, %g3
kvmap_vmemmap:
sub %g4, %g5, %g5
srlx %g5, 22, %g5
sethi %hi(vmemmap_table), %g1
sllx %g5, 3, %g5
or %g1, %lo(vmemmap_table), %g1
ba,pt %xcc, kvmap_dtlb_load
ldx [%g1 + %g5], %g5
kvmap_dtlb_nonlinear:
/* Catch kernel NULL pointer derefs. */
sethi %hi(PAGE_SIZE), %g5
@ -233,6 +242,13 @@ kvmap_dtlb_nonlinear:
bleu,pn %xcc, kvmap_dtlb_longpath
nop
/* Do not use the TSB for vmemmap. */
mov (VMEMMAP_BASE >> 24), %g5
sllx %g5, 24, %g5
cmp %g4,%g5
bgeu,pn %xcc, kvmap_vmemmap
nop
KERN_TSB_LOOKUP_TL1(%g4, %g6, %g5, %g1, %g2, %g3, kvmap_dtlb_load)
kvmap_dtlb_tsbmiss:

52
arch/sparc64/mm/init.c
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@ -1645,6 +1645,58 @@ EXPORT_SYMBOL(_PAGE_E);
unsigned long _PAGE_CACHE __read_mostly;
EXPORT_SYMBOL(_PAGE_CACHE);
#ifdef CONFIG_SPARSEMEM_VMEMMAP
#define VMEMMAP_CHUNK_SHIFT 22
#define VMEMMAP_CHUNK (1UL << VMEMMAP_CHUNK_SHIFT)
#define VMEMMAP_CHUNK_MASK ~(VMEMMAP_CHUNK - 1UL)
#define VMEMMAP_ALIGN(x) (((x)+VMEMMAP_CHUNK-1UL)&VMEMMAP_CHUNK_MASK)
#define VMEMMAP_SIZE ((((1UL << MAX_PHYSADDR_BITS) >> PAGE_SHIFT) * \
sizeof(struct page *)) >> VMEMMAP_CHUNK_SHIFT)
unsigned long vmemmap_table[VMEMMAP_SIZE];
int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node)
{
unsigned long vstart = (unsigned long) start;
unsigned long vend = (unsigned long) (start + nr);
unsigned long phys_start = (vstart - VMEMMAP_BASE);
unsigned long phys_end = (vend - VMEMMAP_BASE);
unsigned long addr = phys_start & VMEMMAP_CHUNK_MASK;
unsigned long end = VMEMMAP_ALIGN(phys_end);
unsigned long pte_base;
pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4U |
_PAGE_CP_4U | _PAGE_CV_4U |
_PAGE_P_4U | _PAGE_W_4U);
if (tlb_type == hypervisor)
pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4V |
_PAGE_CP_4V | _PAGE_CV_4V |
_PAGE_P_4V | _PAGE_W_4V);
for (; addr < end; addr += VMEMMAP_CHUNK) {
unsigned long *vmem_pp =
vmemmap_table + (addr >> VMEMMAP_CHUNK_SHIFT);
void *block;
if (!(*vmem_pp & _PAGE_VALID)) {
block = vmemmap_alloc_block(1UL << 22, node);
if (!block)
return -ENOMEM;
*vmem_pp = pte_base | __pa(block);
printk(KERN_INFO "[%p-%p] page_structs=%lu "
"node=%d entry=%lu/%lu\n", start, block, nr,
node,
addr >> VMEMMAP_CHUNK_SHIFT,
VMEMMAP_SIZE >> VMEMMAP_CHUNK_SHIFT);
}
}
return 0;
}
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
static void prot_init_common(unsigned long page_none,
unsigned long page_shared,
unsigned long page_copy,

3
include/asm-sparc64/pgtable.h
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@ -42,6 +42,9 @@
#define HI_OBP_ADDRESS _AC(0x0000000100000000,UL)
#define VMALLOC_START _AC(0x0000000100000000,UL)
#define VMALLOC_END _AC(0x0000000200000000,UL)
#define VMEMMAP_BASE _AC(0x0000000200000000,UL)
#define vmemmap ((struct page *)VMEMMAP_BASE)
/* XXX All of this needs to be rethought so we can take advantage
* XXX cheetah's full 64-bit virtual address space, ie. no more hole