With kernel commit 4ffe713b7587 ("powerpc/mm: Increase the max addressable
memory to 2PB"), MAX_PHYSMEM_BITS is bumped up to 51 for SPARSEMEM_VMEMMAP
and SPARSEMEM_EXTREME case. Make the appropriate update here.
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxx>
---
defs.h | 1 +
ppc64.c | 33 ++++++++++++++++++++++++++-------
2 files changed, 27 insertions(+), 7 deletions(-)
diff --git a/defs.h b/defs.h
index b66ccad..9ce32c1 100644
--- a/defs.h
+++ b/defs.h
@@ -4093,6 +4093,7 @@ struct efi_memory_desc_t {
#define _MAX_PHYSMEM_BITS 44
#define _MAX_PHYSMEM_BITS_3_7 46
#define _MAX_PHYSMEM_BITS_4_19 47
+#define _MAX_PHYSMEM_BITS_4_20 51
#endif /* PPC64 */
diff --git a/ppc64.c b/ppc64.c
index 041480b..485fa9d 100644
--- a/ppc64.c
+++ b/ppc64.c
@@ -220,6 +220,31 @@ static int ppc64_is_vmaddr(ulong addr)
return (vt->vmalloc_start && addr >= vt->vmalloc_start);
}
+static int set_ppc64_max_physmem_bits(void)
+{
+ int dimension;
+
+ get_array_length("mem_section", &dimension, 0);
+
+ if ((machdep->flags & VMEMMAP) &&
+ (THIS_KERNEL_VERSION >= LINUX(4,20,0)) &&
+ !dimension && (machdep->pagesize == 65536)) {
+ /*
+ * SPARSEMEM_VMEMMAP & SPARSEMEM_EXTREME configurations with
+ * 64K pagesize and v4.20 kernel or later.
+ */
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_4_20;
+ } else if ((machdep->flags & VMEMMAP) &&
+ (THIS_KERNEL_VERSION >= LINUX(4,19,0))) {
+ /* SPARSEMEM_VMEMMAP & v4.19 kernel or later */
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_4_19;
+ } else if (THIS_KERNEL_VERSION >= LINUX(3,7,0))
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_3_7;
+ else
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
+
+ return 0;
+}
struct machine_specific ppc64_machine_specific = {
.hwintrstack = { 0 },
@@ -583,13 +608,7 @@ ppc64_init(int when)
ppc64_vmemmap_init();
machdep->section_size_bits = _SECTION_SIZE_BITS;
- if ((machdep->flags & VMEMMAP) &&
- (THIS_KERNEL_VERSION >= LINUX(4,19,0)))
- machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_4_19;
- else if (THIS_KERNEL_VERSION >= LINUX(3,7,0))
- machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_3_7;
- else
- machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
+ set_ppc64_max_physmem_bits();
ppc64_init_cpu_info();
machdep->vmalloc_start = ppc64_vmalloc_start;
--
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