From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 298D12C00CD for ; Tue, 21 May 2013 13:23:28 +1000 (EST) Received: from [127.0.0.1] (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.13.8) with ESMTP id r4L3NOwS032747 for ; Mon, 20 May 2013 22:23:25 -0500 Message-ID: <1369106602.6387.35.camel@pasglop> Subject: [PATCH] powerpc: Fix TLB cleanup at boot on POWER8 From: Benjamin Herrenschmidt To: "linuxppc-dev@lists.ozlabs.org" Date: Tue, 21 May 2013 13:23:22 +1000 Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The TLB has 512 congruence classes (2048 entries 4 way set associative) while P7 had 128 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/cpu_setup_power.S | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/cpu_setup_power.S b/arch/powerpc/kernel/cpu_setup_power.S index a283b64..18b5b9c 100644 --- a/arch/powerpc/kernel/cpu_setup_power.S +++ b/arch/powerpc/kernel/cpu_setup_power.S @@ -135,8 +135,12 @@ __init_HFSCR: blr __init_TLB: - /* Clear the TLB */ - li r6,128 + /* + * Clear the TLB using the "IS 3" form of tlbiel instruction + * (invalidate by congruence class). P7 has 128 CCs, P8 has 512 + * so we just always do 512 + */ + li r6,512 mtctr r6 li r7,0xc00 /* IS field = 0b11 */ ptesync