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Commit fdaccf74 authored by Vijay Kumar's avatar Vijay Kumar Committed by David S. Miller
Browse files

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



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: default avatarVijay Kumar <vijay.ac.kumar@oracle.com>
Reviewed-by: default avatarBob Picco <bob.picco@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7d484acb

arch/sparc/mm/init_64.c

+11 −1
Original line number Diff line number Diff line
@@ -1944,12 +1944,22 @@ static void __init setup_page_offset(void) 
			break;

		case SUN4V_CHIP_SPARC_M7:

		case SUN4V_CHIP_SPARC_SN:

		default:

			/* M7 and later support 52-bit virtual addresses.  */

			sparc64_va_hole_top =    0xfff8000000000000UL;

			sparc64_va_hole_bottom = 0x0008000000000000UL;

			max_phys_bits = 49;

			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;

		}

	}