From patchwork Tue Sep 10 09:16:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 1160177 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 46SKd82CkZz9s00 for ; Tue, 10 Sep 2019 19:35:08 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=c-s.fr header.i=@c-s.fr header.b="kkcWCaCT"; dkim-atps=neutral Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 46SKd80Qs1zDr3r for ; Tue, 10 Sep 2019 19:35:08 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=c-s.fr (client-ip=93.17.236.30; helo=pegase1.c-s.fr; envelope-from=christophe.leroy@c-s.fr; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=c-s.fr header.i=@c-s.fr header.b="kkcWCaCT"; dkim-atps=neutral Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 46SKDg6BfSzDqvL for ; Tue, 10 Sep 2019 19:17:23 +1000 (AEST) Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 46SKDZ0xGPz9txWF; Tue, 10 Sep 2019 11:17:18 +0200 (CEST) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=kkcWCaCT; 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 nDkcXMjkgDRt; Tue, 10 Sep 2019 11:17:18 +0200 (CEST) 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 46SKDY5crhz9txW3; Tue, 10 Sep 2019 11:17:17 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1568107038; bh=NkamMLYWkTRb4MIQTbWL0E/hNXMZkvWH96BKgp+YBow=; h=In-Reply-To:References:From:Subject:To:Cc:Date:From; b=kkcWCaCTbkDRLSJzo4u1Zy9iGNFB2ICqDMZEaM9aMdsC1rRC+y70hBPy7dFZnq+WH tRN/pYxLaxQwrgpV3NCaBitDiBeS/CrBfq2+J8NZ++JbqnXylJRBZ0GyYPqqvWwJii X9qdC07RN5QxkTsWgfcoZ+qkHXu7Jkgi5MSZeOnU= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 994E68B888; Tue, 10 Sep 2019 11:17:16 +0200 (CEST) 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 pfq1G8uDpkbN; Tue, 10 Sep 2019 11:17:15 +0200 (CEST) Received: from pc16032vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id A34A88B89B; Tue, 10 Sep 2019 11:16:32 +0200 (CEST) Received: by pc16032vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 532426B739; Tue, 10 Sep 2019 09:16:32 +0000 (UTC) Message-Id: <1e17bd51cb1db72fdfb204d9da56df939e14eaba.1568106758.git.christophe.leroy@c-s.fr> In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v3 13/15] powerpc/8xx: Enable CONFIG_VMAP_STACK To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , npiggin@gmail.com, dja@axtens.net Date: Tue, 10 Sep 2019 09:16:32 +0000 (UTC) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 | 34 ++++++++++++++++++++++++++++------ arch/powerpc/platforms/Kconfig.cputype | 1 + 2 files changed, 29 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 225e242ce1c5..fc6d4d10e298 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 dar 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 dar 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 dar 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 dar 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) @@ -492,16 +498,20 @@ DARFixed:/* Return from dcbx instruction bug workaround */ */ do_databreakpoint: EXCEPTION_PROLOG_1 - EXCEPTION_PROLOG_2 + EXCEPTION_PROLOG_2 dar 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 dar mfspr r11, SPRN_SRR0 cmplwi cr1, r11, (.Ldtlbie - PAGE_OFFSET)@l cmplwi cr7, r11, (.Litlbie - PAGE_OFFSET)@l @@ -530,6 +540,11 @@ InstructionBreakpoint: EXCEPTION(0x1e00, Trap_1e, unknown_exception, EXC_XFER_STD) EXCEPTION(0x1f00, Trap_1f, unknown_exception, EXC_XFER_STD) +#ifdef CONFIG_VMAP_STACK +stack_ovf_trampoline: + b stack_ovf +#endif + . = 0x2000 /* This is the procedure to calculate the data EA for buggy dcbx,dcbi instructions @@ -650,7 +665,14 @@ 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 12543e53fa96..3c42569b75cc 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"