Commit 0ef3783d authored by Donet Tom's avatar Donet Tom Committed by Andrew Morton
Browse files

selftests/mm: add support to test 4PB VA on PPC64 

PowerPC64 supports a 4PB virtual address space, but this test was
previously limited to 512TB.  This patch extends the coverage up to the
full 4PB VA range on PowerPC64.

Memory from 0 to 128TB is allocated without an address hint, while
allocations from 128TB to 4PB use a hint address.

Link: https://lkml.kernel.org/r/20250816040113.760010-3-aboorvad@linux.ibm.com


Co-developed-by: default avatarAboorva Devarajan <aboorvad@linux.ibm.com>
Signed-off-by: default avatarAboorva Devarajan <aboorvad@linux.ibm.com>
Signed-off-by: default avatarDonet Tom <donettom@linux.ibm.com>
Reviewed-by: default avatarDev Jain <dev.jain@arm.com>
Acked-by: default avatarDavid Hildenbrand <david@redhat.com>
Reviewed-by: default avatarZi Yan <ziy@nvidia.com>
Reviewed-by: default avatarWei Yang <richard.weiyang@gmail.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mariano Pache <npache@redhat.com>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent eda0bf33

tools/testing/selftests/mm/virtual_address_range.c

+11 −0
Original line number Diff line number Diff line
@@ -44,12 +44,18 @@ 
 * On Arm64 the address space is 256TB and support for

 * high mappings up to 4PB virtual address space has

 * been added.

 *

 * On PowerPC64, the address space up to 128TB can be

 * mapped without a hint. Addresses beyond 128TB, up to

 * 4PB, can be mapped with a hint.

 *

 */



#define NR_CHUNKS_128TB   ((128 * SZ_1TB) / MAP_CHUNK_SIZE) /* Number of chunks for 128TB */

#define NR_CHUNKS_256TB   (NR_CHUNKS_128TB * 2UL)

#define NR_CHUNKS_384TB   (NR_CHUNKS_128TB * 3UL)

#define NR_CHUNKS_3840TB  (NR_CHUNKS_128TB * 30UL)

#define NR_CHUNKS_3968TB  (NR_CHUNKS_128TB * 31UL)



#define ADDR_MARK_128TB  (1UL << 47) /* First address beyond 128TB */

#define ADDR_MARK_256TB  (1UL << 48) /* First address beyond 256TB */
@@ -59,6 +65,11 @@ 
#define HIGH_ADDR_SHIFT 49

#define NR_CHUNKS_LOW   NR_CHUNKS_256TB

#define NR_CHUNKS_HIGH  NR_CHUNKS_3840TB

#elif defined(__PPC64__)

#define HIGH_ADDR_MARK  ADDR_MARK_128TB

#define HIGH_ADDR_SHIFT 48

#define NR_CHUNKS_LOW   NR_CHUNKS_128TB

#define NR_CHUNKS_HIGH  NR_CHUNKS_3968TB

#else

#define HIGH_ADDR_MARK  ADDR_MARK_128TB

#define HIGH_ADDR_SHIFT 48