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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: Aboorva Devarajan <aboorvad@linux.ibm.com>
Signed-off-by: Aboorva Devarajan <aboorvad@linux.ibm.com>
Signed-off-by: Donet Tom <donettom@linux.ibm.com>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Wei 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: Andrew Morton <akpm@linux-foundation.org>
pull/1354/merge
Donet Tom 2025-08-16 09:31:08 +05:30 committed by Andrew Morton
parent eda0bf339b
commit 0ef3783d75
1 changed files with 11 additions and 0 deletions
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11
tools/testing/selftests/mm/virtual_address_range.c
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@ -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