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sparc64: Increase MAX_PHYS_ADDRESS_BITS to 53. 

Make sure, at compile time, that the kernel can properly support
whatever MAX_PHYS_ADDRESS_BITS is defined to.

On M7 chips, use a max_phys_bits value of 49.

Based upon a patch by Bob Picco.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David S. Miller 2014-09-24 21:49:29 -07:00 committed by Greg Kroah-Hartman
parent 29070cdcc7
commit e0b18223c6
3 changed files with 16 additions and 5 deletions
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8
arch/sparc/include/asm/page_64.h
View File

@ -122,11 +122,11 @@ extern unsigned long PAGE_OFFSET;
#endif /* !(__ASSEMBLY__) */
/* The maximum number of physical memory address bits we support, this
* is used to size various tables used to manage kernel TLB misses and
* also the sparsemem code.
/* The maximum number of physical memory address bits we support. The
* largest value we can support is whatever "KPGD_SHIFT + KPTE_BITS"
* evaluates to.
*/
#define MAX_PHYS_ADDRESS_BITS 47
#define MAX_PHYS_ADDRESS_BITS 53
#define ILOG2_4MB 22
#define ILOG2_256MB 28

4
arch/sparc/include/asm/pgtable_64.h
View File

@ -67,6 +67,10 @@
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define PGDIR_BITS (PAGE_SHIFT - 3)
#if (MAX_PHYS_ADDRESS_BITS > PGDIR_SHIFT + PGDIR_BITS)
#error MAX_PHYS_ADDRESS_BITS exceeds what kernel page tables can support
#endif
#if (PGDIR_SHIFT + PGDIR_BITS) != 53
#error Page table parameters do not cover virtual address space properly.
#endif

9
arch/sparc/mm/init_64.c
View File

@ -1684,12 +1684,19 @@ static void __init setup_page_offset(void)
case SUN4V_CHIP_NIAGARA4:
case SUN4V_CHIP_NIAGARA5:
case SUN4V_CHIP_SPARC64X:
default:
case SUN4V_CHIP_SPARC_M6:
/* T4 and later support 52-bit virtual addresses. */
sparc64_va_hole_top = 0xfff8000000000000UL;
sparc64_va_hole_bottom = 0x0008000000000000UL;
max_phys_bits = 47;
break;
case SUN4V_CHIP_SPARC_M7:
default:
/* M7 and later support 52-bit virtual addresses. */
sparc64_va_hole_top = 0xfff8000000000000UL;
sparc64_va_hole_bottom = 0x0008000000000000UL;
max_phys_bits = 49;
break;
}
}