[Crash-utility] [PATCH v2] book3s/ppc64: update hash page table geometry

[Hari Bathini]

Starting with kernel 4.12, the hash page table geometry is updated to
accommodate larger VA range. Update here accordingly.

Signed-off-by: Hari Bathini <hbathini at linux.vnet.ibm.com>
---
changes in v1:
* Kernel commit 92d9dfda8b54 reverted the geometry update
  for 4K hash pagetable. So, undo'ing 4K pagesize changes.

 defs.h  |    3 +++
 ppc64.c |   12 +++++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/defs.h b/defs.h
index 18f36b3..9132075 100644
--- a/defs.h
+++ b/defs.h
@@ -3915,6 +3915,9 @@ struct efi_memory_desc_t {
 #define PGD_INDEX_SIZE_L4_64K_3_10  12
 #define PMD_INDEX_SIZE_L4_64K_4_6  5
 #define PUD_INDEX_SIZE_L4_64K_4_6  5
+#define PMD_INDEX_SIZE_L4_64K_4_12 10
+#define PUD_INDEX_SIZE_L4_64K_4_12 7
+#define PGD_INDEX_SIZE_L4_64K_4_12 8
 #define PTE_INDEX_SIZE_RADIX_64K  5
 #define PMD_INDEX_SIZE_RADIX_64K  9
 #define PUD_INDEX_SIZE_RADIX_64K  9
diff --git a/ppc64.c b/ppc64.c
index 84cec09..672ee60 100644
--- a/ppc64.c
+++ b/ppc64.c
@@ -447,10 +447,16 @@ ppc64_init(int when)
 				} else if (!(machdep->flags & BOOK3E) &&
 				    (THIS_KERNEL_VERSION >= LINUX(4,6,0))) {
 					m->l1_index_size = PTE_INDEX_SIZE_L4_64K_3_10;
-					m->l2_index_size = PMD_INDEX_SIZE_L4_64K_4_6;
-					m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_6;
-					m->l4_index_size = PGD_INDEX_SIZE_L4_64K_3_10;
 
+					if (THIS_KERNEL_VERSION >= LINUX(4,12,0)) {
+						m->l2_index_size = PMD_INDEX_SIZE_L4_64K_4_12;
+						m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_12;
+						m->l4_index_size = PGD_INDEX_SIZE_L4_64K_4_12;
+					} else {
+						m->l2_index_size = PMD_INDEX_SIZE_L4_64K_4_6;
+						m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_6;
+						m->l4_index_size = PGD_INDEX_SIZE_L4_64K_3_10;
+					}
 				} else if (THIS_KERNEL_VERSION >= LINUX(3,10,0)) {
 					m->l1_index_size = PTE_INDEX_SIZE_L4_64K_3_10;
 					m->l2_index_size = PMD_INDEX_SIZE_L4_64K_3_10;