powerpc/64s/ptdump: Fix kernel_hash_pagetable dump for ISA v3.00 HPTE format

HPTE format was changed since Power9 (ISA 3.0) onwards. While dumping
kernel hash page tables, nothing gets printed on powernv P9+. This patch
utilizes the helpers added in the patch tagged as fixes, to convert new
format to old format and dump the hptes. This fix is only needed for
native_find() (powernv), since pseries continues to work fine with the
old format.

Fixes: 6b243fcfb5f1e ("powerpc/64: Simplify adaptation to new ISA v3.00 HPTE format")
Signed-off-by: Ritesh Harjani (IBM) <[e-mail]>
Signed-off-by: Madhavan Srinivasan <[e-mail]>
Link: https://patch.msgid.link/4c2[e-mail]

arch/powerpc/mm/ptdump/hashpagetable.c

···
 	vpn  = hpt_vpn(ea, vsid, ssize);
 	hash = hpt_hash(vpn, shift, ssize);
 	want_v = hpte_encode_avpn(vpn, psize, ssize);
+	if (cpu_has_feature(CPU_FTR_ARCH_300))
+		want_v = hpte_old_to_new_v(want_v);
 
 	/* to check in the secondary hash table, we invert the hash */
 	if (!primary)
···
 			/* HPTE matches */
 			*v = be64_to_cpu(hptep->v);
 			*r = be64_to_cpu(hptep->r);
+			if (cpu_has_feature(CPU_FTR_ARCH_300)) {
+				*v = hpte_new_to_old_v(*v, *r);
+				*r = hpte_new_to_old_r(*r);
+			}
 			return 0;
 		}
 		++hpte_group;