linux-kernel - [PATCH v3 2/7] selftests/mm: Add support to test 4PB VA on PPC64

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Message-ID: <20250729053403.1071807-3-aboorvad@linux.ibm.com>
Date: Tue, 29 Jul 2025 11:03:58 +0530
From: Aboorva Devarajan <aboorvad@...ux.ibm.com>
To: akpm@...ux-foundation.org, Liam.Howlett@...cle.com,
        lorenzo.stoakes@...cle.com, shuah@...nel.org, pfalcato@...e.de,
        david@...hat.com, ziy@...dia.com, baolin.wang@...ux.alibaba.com,
        npache@...hat.com, ryan.roberts@....com, dev.jain@....com,
        baohua@...nel.org
Cc: linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, donettom@...ux.ibm.com,
        ritesh.list@...il.com, aboorvad@...ux.ibm.com
Subject: [PATCH v3 2/7] selftests/mm: Add support to test 4PB VA on PPC64

From: Donet Tom <donettom@...ux.ibm.com>

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.

Reviewed-by: Dev Jain <dev.jain@....com>
Acked-by: David Hildenbrand <david@...hat.com>
Reviewed-by: Zi Yan <ziy@...dia.com>
Co-developed-by: Aboorva Devarajan <aboorvad@...ux.ibm.com>
Signed-off-by: Aboorva Devarajan <aboorvad@...ux.ibm.com>
Signed-off-by: Donet Tom <donettom@...ux.ibm.com>
---
 tools/testing/selftests/mm/virtual_address_range.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/testing/selftests/mm/virtual_address_range.c b/tools/testing/selftests/mm/virtual_address_range.c
index e24c36a39f22..81b33d8f78f4 100644
--- a/tools/testing/selftests/mm/virtual_address_range.c
+++ b/tools/testing/selftests/mm/virtual_address_range.c
@@ -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
-- 
2.47.1