From patchwork Wed Dec 12 16:47:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julien Thierry X-Patchwork-Id: 10726783 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B40946C5 for ; Wed, 12 Dec 2018 16:58:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9D89229BF5 for ; Wed, 12 Dec 2018 16:58:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8EC2129C0C; Wed, 12 Dec 2018 16:58:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 1463529BF5 for ; Wed, 12 Dec 2018 16:58:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=pvhAG4yBVXJuj/Lf8sVW6PS331ZMsY2LvKHVjA57NO8=; b=pBxibKm1/ccYAJH9ZJhQ3h8+sk T9x6yPqV3hb38O0ut5zvi/uXzMqEamJAy+vIImgSe0sV2F/62hUuNPxZderd/ek8tX+q2V7ZLSQL0 VT6yTojSn/T1FzfDcz+GRHiBRjGr/RBIaPN+6W8IgzZDgIZyfcxbg4BJEYbA8QVql+CXu0UXpisOG Sm8dmiuNwcOTsqOttbNKs75VzQdlp1HXvTX6ZDCWI8DT5oBEfQYMDfBAjUxTQxdi8oBAM2pU1l17a gkKn5NVQ+irGpFwg8xDA9OwZRUamXfoW5AFMxhIXRyigeLs6QAJtVaCo7vAj6Jd2WDb3X79a+60HV QeN27RhA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gX7qR-0002fj-AL; Wed, 12 Dec 2018 16:58:47 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gX7gO-0002hO-5b for linux-arm-kernel@lists.infradead.org; Wed, 12 Dec 2018 16:48:34 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4D9B21688; Wed, 12 Dec 2018 08:48:18 -0800 (PST) Received: from e112298-lin.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id DE5D93F575; Wed, 12 Dec 2018 08:48:15 -0800 (PST) From: Julien Thierry To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v7 13/25] arm64: alternative: Allow alternative status checking per cpufeature Date: Wed, 12 Dec 2018 16:47:13 +0000 Message-Id: <1544633245-6036-14-git-send-email-julien.thierry@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1544633245-6036-1-git-send-email-julien.thierry@arm.com> References: <1544633245-6036-1-git-send-email-julien.thierry@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181212_084825_179791_BF428B7B X-CRM114-Status: GOOD ( 17.79 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, daniel.thompson@linaro.org, Julien Thierry , Marc Zyngier , catalin.marinas@arm.com, Suzuki K Poulose , will.deacon@arm.com, linux-kernel@vger.kernel.org, Christoffer Dall , james.morse@arm.com, joel@joelfernandes.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP In preparation for the application of alternatives at different points during the boot process, provide the possibility to check whether alternatives for a feature of interest was already applied instead of having a global boolean for all alternatives. Make VHE enablement code check for the VHE feature instead of considering all alternatives. Signed-off-by: Julien Thierry Cc: Catalin Marinas Cc: Will Deacon Cc: Suzuki K Poulose Cc: Marc Zyngier Cc: Christoffer Dall --- arch/arm64/include/asm/alternative.h | 3 +-- arch/arm64/kernel/alternative.c | 21 +++++++++++++++++---- arch/arm64/kernel/cpufeature.c | 2 +- 3 files changed, 19 insertions(+), 7 deletions(-) diff --git a/arch/arm64/include/asm/alternative.h b/arch/arm64/include/asm/alternative.h index 4b650ec..9806a23 100644 --- a/arch/arm64/include/asm/alternative.h +++ b/arch/arm64/include/asm/alternative.h @@ -14,8 +14,6 @@ #include #include -extern int alternatives_applied; - struct alt_instr { s32 orig_offset; /* offset to original instruction */ s32 alt_offset; /* offset to replacement instruction */ @@ -28,6 +26,7 @@ typedef void (*alternative_cb_t)(struct alt_instr *alt, __le32 *origptr, __le32 *updptr, int nr_inst); void __init apply_alternatives_all(void); +bool alternative_is_applied(u16 cpufeature); #ifdef CONFIG_MODULES void apply_alternatives_module(void *start, size_t length); diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c index b5d6039..c947d22 100644 --- a/arch/arm64/kernel/alternative.c +++ b/arch/arm64/kernel/alternative.c @@ -32,13 +32,23 @@ #define ALT_ORIG_PTR(a) __ALT_PTR(a, orig_offset) #define ALT_REPL_PTR(a) __ALT_PTR(a, alt_offset) -int alternatives_applied; +static int all_alternatives_applied; + +static DECLARE_BITMAP(applied_alternatives, ARM64_NCAPS); struct alt_region { struct alt_instr *begin; struct alt_instr *end; }; +bool alternative_is_applied(u16 cpufeature) +{ + if (WARN_ON(cpufeature >= ARM64_NCAPS)) + return false; + + return test_bit(cpufeature, applied_alternatives); +} + /* * Check if the target PC is within an alternative block. */ @@ -192,6 +202,9 @@ static void __apply_alternatives(void *alt_region, bool is_module) dsb(ish); __flush_icache_all(); isb(); + + /* We applied all that was available */ + bitmap_copy(applied_alternatives, cpu_hwcaps, ARM64_NCAPS); } } @@ -208,14 +221,14 @@ static int __apply_alternatives_multi_stop(void *unused) /* We always have a CPU 0 at this point (__init) */ if (smp_processor_id()) { - while (!READ_ONCE(alternatives_applied)) + while (!READ_ONCE(all_alternatives_applied)) cpu_relax(); isb(); } else { - BUG_ON(alternatives_applied); + BUG_ON(all_alternatives_applied); __apply_alternatives(®ion, false); /* Barriers provided by the cache flushing */ - WRITE_ONCE(alternatives_applied, 1); + WRITE_ONCE(all_alternatives_applied, 1); } return 0; diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 4426b5b..b7539c7 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1068,7 +1068,7 @@ static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused) * that, freshly-onlined CPUs will set tpidr_el2, so we don't need to * do anything here. */ - if (!alternatives_applied) + if (!alternative_is_applied(ARM64_HAS_VIRT_HOST_EXTN)) write_sysreg(read_sysreg(tpidr_el1), tpidr_el2); } #endif