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Fri, 29 Aug 2025 20:54:17 -0700 (PDT) Received: from dw-tp ([171.76.86.139]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-327da90ee17sm4279879a91.24.2025.08.29.20.54.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Aug 2025 20:54:17 -0700 (PDT) From: "Ritesh Harjani (IBM)" To: linuxppc-dev@lists.ozlabs.org Cc: "Ritesh Harjani (IBM)" , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Mackerras , "Aneesh Kumar K.V" , Donet Tom Subject: [RFC 4/8] powerpc/ptdump/64: Fix kernel_hash_pagetable dump for ISA v3.00 HPTE format Date: Sat, 30 Aug 2025 09:21:43 +0530 Message-ID: <91cdba6f4a58d3e11ae95be99df3852c49baf2a7.1756522067.git.ritesh.list@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Paul Mackerras Cc: "Aneesh Kumar K.V" Cc: Donet Tom Cc: linuxppc-dev@lists.ozlabs.org Fixes: 6b243fcfb5f1e ("powerpc/64: Simplify adaptation to new ISA v3.00 HPTE format") Signed-off-by: Ritesh Harjani (IBM) --- arch/powerpc/mm/ptdump/hashpagetable.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/powerpc/mm/ptdump/hashpagetable.c b/arch/powerpc/mm/ptdump/hashpagetable.c index a6baa6166d94..671d0dc00c6d 100644 --- a/arch/powerpc/mm/ptdump/hashpagetable.c +++ b/arch/powerpc/mm/ptdump/hashpagetable.c @@ -216,6 +216,8 @@ static int native_find(unsigned long ea, int psize, bool primary, u64 *v, u64 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) @@ -229,6 +231,10 @@ static int native_find(unsigned long ea, int psize, bool primary, u64 *v, u64 /* 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; -- 2.50.1