From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4000DC2D0D3 for ; Sat, 21 Dec 2019 08:32:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 12CB32253D for ; Sat, 21 Dec 2019 08:32:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="wGJ/p0M/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726933AbfLUIcm (ORCPT ); Sat, 21 Dec 2019 03:32:42 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:62735 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726874AbfLUIci (ORCPT ); Sat, 21 Dec 2019 03:32:38 -0500 Received: from localhost (mailhub1-ext [192.168.12.233]) by localhost (Postfix) with ESMTP id 47fzPv2rcPz9txhG; Sat, 21 Dec 2019 09:32:35 +0100 (CET) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=wGJ/p0M/; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id b44xrpceu8m4; Sat, 21 Dec 2019 09:32:35 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 47fzPv1qrdz9txh9; Sat, 21 Dec 2019 09:32:35 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1576917155; bh=CGbgPE/GCECgmV7WaXbEokdK8c5p9Q9p3qw+ROQpjHo=; h=In-Reply-To:References:From:Subject:To:Cc:Date:From; b=wGJ/p0M/IuCtfFy9YCi5r4JX1wgoqma5Qc7hjvkpeGj5fxlzFA0NvzAEvmAE+uMZb nAnYThuKOK9Y4kf/paAGx80kJYvg8Ldw7Xdiw1n8ODMsEC0Zl0xbZp3+VCI+AK/ocG OuxxGy3s4sETipJVRHSy75TrXAR9kUBFO7E3wFL4= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 477BB8B77C; Sat, 21 Dec 2019 09:32:36 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id 3IamUZ003aVD; Sat, 21 Dec 2019 09:32:36 +0100 (CET) Received: from localhost.localdomain (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 0165A8B752; Sat, 21 Dec 2019 09:32:35 +0100 (CET) Received: by localhost.localdomain (Postfix, from userid 0) id BF083637B6; Sat, 21 Dec 2019 08:32:35 +0000 (UTC) Message-Id: In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v5 14/17] powerpc/8xx: Enable CONFIG_VMAP_STACK To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , dja@axtens.net Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org Date: Sat, 21 Dec 2019 08:32:35 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch enables CONFIG_VMAP_STACK. For that, a few changes are done in head_8xx.S. Signed-off-by: Christophe Leroy --- arch/powerpc/kernel/head_8xx.S | 32 ++++++++++++++++++++++++++------ arch/powerpc/platforms/Kconfig.cputype | 1 + 2 files changed, 27 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 225e242ce1c5..477933b36bde 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -127,7 +127,7 @@ instruction_counter: /* Machine check */ . = 0x200 MachineCheck: - EXCEPTION_PROLOG + EXCEPTION_PROLOG handle_dar_dsisr=1 save_dar_dsisr_on_stack r4, r5, r11 li r6, RPN_PATTERN mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */ @@ -140,7 +140,7 @@ MachineCheck: /* Alignment exception */ . = 0x600 Alignment: - EXCEPTION_PROLOG + EXCEPTION_PROLOG handle_dar_dsisr=1 save_dar_dsisr_on_stack r4, r5, r11 li r6, RPN_PATTERN mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */ @@ -457,20 +457,26 @@ InstructionTLBError: */ . = 0x1400 DataTLBError: - EXCEPTION_PROLOG_0 + EXCEPTION_PROLOG_0 handle_dar_dsisr=1 mfspr r11, SPRN_DAR cmpwi cr1, r11, RPN_PATTERN beq- cr1, FixupDAR /* must be a buggy dcbX, icbi insn. */ DARFixed:/* Return from dcbx instruction bug workaround */ +#ifdef CONFIG_VMAP_STACK + li r11, RPN_PATTERN + mtspr SPRN_DAR, r11 /* Tag DAR, to be used in DTLB Error */ +#endif EXCEPTION_PROLOG_1 - EXCEPTION_PROLOG_2 + EXCEPTION_PROLOG_2 handle_dar_dsisr=1 get_and_save_dar_dsisr_on_stack r4, r5, r11 andis. r10,r5,DSISR_NOHPTE@h beq+ .Ldtlbie tlbie r4 .Ldtlbie: +#ifndef CONFIG_VMAP_STACK li r10,RPN_PATTERN mtspr SPRN_DAR,r10 /* Tag DAR, to be used in DTLB Error */ +#endif /* 0x300 is DataAccess exception, needed by bad_page_fault() */ EXC_XFER_LITE(0x300, handle_page_fault) @@ -486,22 +492,29 @@ DARFixed:/* Return from dcbx instruction bug workaround */ rfi #endif +stack_overflow: + vmap_stack_overflow_exception + /* On the MPC8xx, these next four traps are used for development * support of breakpoints and such. Someday I will get around to * using them. */ do_databreakpoint: EXCEPTION_PROLOG_1 - EXCEPTION_PROLOG_2 + EXCEPTION_PROLOG_2 handle_dar_dsisr=1 addi r3,r1,STACK_FRAME_OVERHEAD mfspr r4,SPRN_BAR stw r4,_DAR(r11) +#ifdef CONFIG_VMAP_STACK + lwz r5,_DSISR(r11) +#else mfspr r5,SPRN_DSISR +#endif EXC_XFER_STD(0x1c00, do_break) . = 0x1c00 DataBreakpoint: - EXCEPTION_PROLOG_0 + EXCEPTION_PROLOG_0 handle_dar_dsisr=1 mfspr r11, SPRN_SRR0 cmplwi cr1, r11, (.Ldtlbie - PAGE_OFFSET)@l cmplwi cr7, r11, (.Litlbie - PAGE_OFFSET)@l @@ -650,7 +663,14 @@ FixupDAR:/* Entry point for dcbx workaround. */ 152: mfdar r11 mtctr r11 /* restore ctr reg from DAR */ +#ifdef CONFIG_VMAP_STACK + mfspr r11, SPRN_SPRG_THREAD + stw r10, DAR(r11) + mfspr r10, SPRN_DSISR + stw r10, DSISR(r11) +#else mtdar r10 /* save fault EA to DAR */ +#endif mfspr r10,SPRN_M_TW b DARFixed /* Go back to normal TLB handling */ diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index 8d7f9c3dc771..000dd297337c 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -49,6 +49,7 @@ config PPC_8xx select PPC_HAVE_KUEP select PPC_HAVE_KUAP select PPC_MM_SLICES if HUGETLB_PAGE + select HAVE_ARCH_VMAP_STACK config 40x bool "AMCC 40x" -- 2.13.3