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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 54FFDC433E9 for ; Wed, 13 Jan 2021 08:22:02 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8052C2343E for ; Wed, 13 Jan 2021 08:22:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8052C2343E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4DG0m527XbzDsGJ for ; Wed, 13 Jan 2021 19:21:57 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:4864:20::1035; helo=mail-pj1-x1035.google.com; envelope-from=npiggin@gmail.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=sGi8V+AL; dkim-atps=neutral Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4DFzgw0R1szDqSC for ; Wed, 13 Jan 2021 18:33:15 +1100 (AEDT) Received: by mail-pj1-x1035.google.com with SMTP id md11so592305pjb.0 for ; Tue, 12 Jan 2021 23:33:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=NsAQRgMWsT/yCVX7JZLR0Q4PQ7PGCZ7U007xXaNGqN4=; b=sGi8V+ALyalwnIxIpTp1qte5OTdC8s98kHoisQM8R+L9aT4CTNMENBqVeplAIVb2U5 CvjGS5vi5Ri5AtqLB15EYegEcgC6ossAsxJOtEEp4Re5QdmWppwGiyjoMD+KdgUTtg0V +MPjp1CfL/eeyiD7bTISSWa+DX8tCYbS8XzWFodzuRmYFzj76i0r0EfjMIn9oXI35U3T w7WERnnHx9k34YGh3tYd64y2IX3a0Ws6QAdz9LVrK05wGnswNpkc2CP6mFGS6JZz9XVr ZyW1uvs1BhG85RrcpU3z0dtvavn7jVX4xEx5Cfirh57phlUJCMVr3gOaOA6xwREGx9pS ACrQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=NsAQRgMWsT/yCVX7JZLR0Q4PQ7PGCZ7U007xXaNGqN4=; b=K6I+AEsT/GM5ZJofFq6rmen53Y/cG2KL6OKnkJ8V6EjtcIrcu0Fl7QGExT7NPFNdRs b9RAwZWNRYdV5hCOfN562A+kl3SSAurFXub3GbJ6a/k2F+RV8evRe46Yo6rmmblrH8xv zrblckxLzEOEA6JXfyV66DVSaqcNOeloyeisXyv4EX1Xdvvk7JOZ/cn2FAoNcGXMaien cFVetEGd4X4idLsaRw24dqTorP26i18BU/CsyG1h532BIGvu/kctEj2DYMrgmzCQVRvG ae616JyCUc1iIi0XwIenrsyD//NDW9V/XLnFKMF1TJj2qQqMLZd+kuNj4pogHhD4BZmA yTmw== X-Gm-Message-State: AOAM5322pnMu53U3B+n1GwObJ6in2c/QPquPnWqKWWPDlTxLLY3ko9JU dqlP07dmCf7flFmcs6+yeX8tMGsXo/M= X-Google-Smtp-Source: ABdhPJynXXL0yurOlEWmJXuHUGpAF6gupM7JZOoTxDt4oTXU6pZLQdS7BmurHoItRwkQHvddXE7/PA== X-Received: by 2002:a17:90a:940e:: with SMTP id r14mr897267pjo.105.1610523192722; Tue, 12 Jan 2021 23:33:12 -0800 (PST) Received: from bobo.ibm.com ([124.170.13.62]) by smtp.gmail.com with ESMTPSA id m77sm1394264pfd.105.2021.01.12.23.33.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Jan 2021 23:33:12 -0800 (PST) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v5 21/21] powerpc/64s: power4 nap fixup in C Date: Wed, 13 Jan 2021 17:32:15 +1000 Message-Id: <20210113073215.516986-22-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210113073215.516986-1-npiggin@gmail.com> References: <20210113073215.516986-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" There is no need for this to be in asm, use the new intrrupt entry wrapper. Signed-off-by: Nicholas Piggin --- arch/powerpc/include/asm/interrupt.h | 15 +++++++++ arch/powerpc/include/asm/processor.h | 1 + arch/powerpc/include/asm/thread_info.h | 6 ++++ arch/powerpc/kernel/exceptions-64s.S | 45 -------------------------- arch/powerpc/kernel/idle_book3s.S | 4 +++ 5 files changed, 26 insertions(+), 45 deletions(-) diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h index 9c16e9a48df6..4e290680f461 100644 --- a/arch/powerpc/include/asm/interrupt.h +++ b/arch/powerpc/include/asm/interrupt.h @@ -8,6 +8,16 @@ #include #include +static inline void nap_adjust_return(struct pt_regs *regs) +{ +#ifdef CONFIG_PPC_970_NAP + if (unlikely(test_thread_local_flags(_TLF_NAPPING))) { + clear_thread_local_flags(_TLF_NAPPING); + regs->nip = (unsigned long)power4_idle_nap_return; + } +#endif +} + struct interrupt_state { #ifdef CONFIG_PPC_BOOK3E_64 enum ctx_state ctx_state; @@ -99,6 +109,9 @@ static inline void interrupt_async_exit_prepare(struct pt_regs *regs, struct int { irq_exit(); interrupt_exit_prepare(regs, state); + + /* Adjust at exit so the main handler sees the true NIA */ + nap_adjust_return(regs); } struct interrupt_nmi_state { @@ -150,6 +163,8 @@ static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct inter radix_enabled() || (mfmsr() & MSR_DR)) nmi_exit(); + nap_adjust_return(regs); + #ifdef CONFIG_PPC64 this_cpu_set_ftrace_enabled(state->ftrace_enabled); diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index 8acc3590c971..eedc3c775141 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -393,6 +393,7 @@ extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val); extern unsigned long isa206_idle_insn_mayloss(unsigned long type); #ifdef CONFIG_PPC_970_NAP extern void power4_idle_nap(void); +void power4_idle_nap_return(void); #endif extern unsigned long cpuidle_disable; diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index 386d576673a1..bf137151100b 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -152,6 +152,12 @@ void arch_setup_new_exec(void); #ifndef __ASSEMBLY__ +static inline void clear_thread_local_flags(unsigned int flags) +{ + struct thread_info *ti = current_thread_info(); + ti->local_flags &= ~flags; +} + static inline bool test_thread_local_flags(unsigned int flags) { struct thread_info *ti = current_thread_info(); diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 8966aa3419d5..12ab2e9f920f 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -692,25 +692,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_CFAR) ld r1,GPR1(r1) .endm -/* - * When the idle code in power4_idle puts the CPU into NAP mode, - * it has to do so in a loop, and relies on the external interrupt - * and decrementer interrupt entry code to get it out of the loop. - * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags - * to signal that it is in the loop and needs help to get out. - */ -#ifdef CONFIG_PPC_970_NAP -#define FINISH_NAP \ -BEGIN_FTR_SECTION \ - ld r11, PACA_THREAD_INFO(r13); \ - ld r9,TI_LOCAL_FLAGS(r11); \ - andi. r10,r9,_TLF_NAPPING; \ - bnel power4_fixup_nap; \ -END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) -#else -#define FINISH_NAP -#endif - /* * There are a few constraints to be concerned with. * - Real mode exceptions code/data must be located at their physical location. @@ -1248,7 +1229,6 @@ EXC_COMMON_BEGIN(machine_check_common) */ GEN_COMMON machine_check - FINISH_NAP /* Enable MSR_RI when finished with PACA_EXMC */ li r10,MSR_RI mtmsrd r10,1 @@ -1573,7 +1553,6 @@ EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100) EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100) EXC_COMMON_BEGIN(hardware_interrupt_common) GEN_COMMON hardware_interrupt - FINISH_NAP addi r3,r1,STACK_FRAME_OVERHEAD bl do_IRQ b interrupt_return @@ -1758,7 +1737,6 @@ EXC_VIRT_BEGIN(decrementer, 0x4900, 0x80) EXC_VIRT_END(decrementer, 0x4900, 0x80) EXC_COMMON_BEGIN(decrementer_common) GEN_COMMON decrementer - FINISH_NAP addi r3,r1,STACK_FRAME_OVERHEAD bl timer_interrupt b interrupt_return @@ -1843,7 +1821,6 @@ EXC_VIRT_BEGIN(doorbell_super, 0x4a00, 0x100) EXC_VIRT_END(doorbell_super, 0x4a00, 0x100) EXC_COMMON_BEGIN(doorbell_super_common) GEN_COMMON doorbell_super - FINISH_NAP addi r3,r1,STACK_FRAME_OVERHEAD #ifdef CONFIG_PPC_DOORBELL bl doorbell_exception @@ -2197,7 +2174,6 @@ EXC_COMMON_BEGIN(hmi_exception_early_common) EXC_COMMON_BEGIN(hmi_exception_common) GEN_COMMON hmi_exception - FINISH_NAP addi r3,r1,STACK_FRAME_OVERHEAD bl handle_hmi_exception b interrupt_return @@ -2226,7 +2202,6 @@ EXC_VIRT_BEGIN(h_doorbell, 0x4e80, 0x20) EXC_VIRT_END(h_doorbell, 0x4e80, 0x20) EXC_COMMON_BEGIN(h_doorbell_common) GEN_COMMON h_doorbell - FINISH_NAP addi r3,r1,STACK_FRAME_OVERHEAD #ifdef CONFIG_PPC_DOORBELL bl doorbell_exception @@ -2259,7 +2234,6 @@ EXC_VIRT_BEGIN(h_virt_irq, 0x4ea0, 0x20) EXC_VIRT_END(h_virt_irq, 0x4ea0, 0x20) EXC_COMMON_BEGIN(h_virt_irq_common) GEN_COMMON h_virt_irq - FINISH_NAP addi r3,r1,STACK_FRAME_OVERHEAD bl do_IRQ b interrupt_return @@ -2305,7 +2279,6 @@ EXC_VIRT_BEGIN(performance_monitor, 0x4f00, 0x20) EXC_VIRT_END(performance_monitor, 0x4f00, 0x20) EXC_COMMON_BEGIN(performance_monitor_common) GEN_COMMON performance_monitor - FINISH_NAP addi r3,r1,STACK_FRAME_OVERHEAD bl performance_monitor_exception b interrupt_return @@ -3056,24 +3029,6 @@ USE_FIXED_SECTION(virt_trampolines) __end_interrupts: DEFINE_FIXED_SYMBOL(__end_interrupts) -#ifdef CONFIG_PPC_970_NAP - /* - * Called by exception entry code if _TLF_NAPPING was set, this clears - * the NAPPING flag, and redirects the exception exit to - * power4_fixup_nap_return. - */ - .globl power4_fixup_nap -EXC_COMMON_BEGIN(power4_fixup_nap) - andc r9,r9,r10 - std r9,TI_LOCAL_FLAGS(r11) - LOAD_REG_ADDR(r10, power4_idle_nap_return) - std r10,_NIP(r1) - blr - -power4_idle_nap_return: - blr -#endif - CLOSE_FIXED_SECTION(real_vectors); CLOSE_FIXED_SECTION(real_trampolines); CLOSE_FIXED_SECTION(virt_vectors); diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S index 22f249b6f58d..27d2e6a72ec9 100644 --- a/arch/powerpc/kernel/idle_book3s.S +++ b/arch/powerpc/kernel/idle_book3s.S @@ -201,4 +201,8 @@ _GLOBAL(power4_idle_nap) mtmsrd r7 isync b 1b + + .globl power4_idle_nap_return +power4_idle_nap_return: + blr #endif -- 2.23.0