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sparc64: Increase max_phys_bits to 51 and VA bits to 53 for M8.

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On M8 chips, use a max_phys_bits value of 51.

Also, M8 supports VA bits up to 54 bits. However, for now
restrict VA bits to 53 due to 4-level pagetable limitation.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vijay Kumar 2017-07-28 19:29:32 -06:00 committed by David S. Miller
parent 7d484acb2f
commit fdaccf74fe
1 changed files with 11 additions and 1 deletions
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12
arch/sparc/mm/init_64.c
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@ -1944,12 +1944,22 @@ static void __init setup_page_offset(void)
break; break;
case SUN4V_CHIP_SPARC_M7: case SUN4V_CHIP_SPARC_M7:
case SUN4V_CHIP_SPARC_SN: case SUN4V_CHIP_SPARC_SN:
default:
/* M7 and later support 52-bit virtual addresses. */ /* M7 and later support 52-bit virtual addresses. */
sparc64_va_hole_top = 0xfff8000000000000UL; sparc64_va_hole_top = 0xfff8000000000000UL;
sparc64_va_hole_bottom = 0x0008000000000000UL; sparc64_va_hole_bottom = 0x0008000000000000UL;
max_phys_bits = 49; max_phys_bits = 49;
break; break;
case SUN4V_CHIP_SPARC_M8:
default:
/* M8 and later support 54-bit virtual addresses.
* However, restricting M8 and above VA bits to 53
* as 4-level page table cannot support more than
* 53 VA bits.
*/
sparc64_va_hole_top = 0xfff0000000000000UL;
sparc64_va_hole_bottom = 0x0010000000000000UL;
max_phys_bits = 51;
break;
} }
} }