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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 92A49CA1016 for ; Mon, 8 Sep 2025 07:41:07 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id F22218E0013; Mon, 8 Sep 2025 03:41:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id ED1E38E0001; Mon, 8 Sep 2025 03:41:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DC1028E0013; Mon, 8 Sep 2025 03:41:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id C596D8E0001 for ; Mon, 8 Sep 2025 03:41:06 -0400 (EDT) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 5D554C0A47 for ; Mon, 8 Sep 2025 07:41:06 +0000 (UTC) X-FDA: 83865286932.12.4B34CEA Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf17.hostedemail.com (Postfix) with ESMTP id BCDEA4000A for ; Mon, 8 Sep 2025 07:41:04 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf17.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1757317264; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=EhKNqTm0VPwIV+TJCnfOAdRU6AcIQZTQAVGXVHxTG+k=; b=QKWJVhxOSWwg6LDiRQQ2yw2wCXZ7oYfjjvugs+v/NjogTuwb4Djcgvx8hSgmBL53/qyBIq v9E49BFi75XYUlzHFWDSnRkMWyb8Y76Ngpo97S5D15xSWUcFxcL3GXvsk5nLD951DLp/tI 7v2IV+/kTnwmzqg9PtrKUH6u7x8osak= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf17.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1757317264; a=rsa-sha256; cv=none; b=8J7D+m8aTrA6IpM3jIELEidmeRVO7iuC2pcYi7TD6trzD/DKjuvCm+90OBTlVJ1P8THisN rQqqnG0bCT46MIc8ZYEhT4CiE55qkcuPxZe5EM0y5NwmiG18weNf8fFgIAHDZvAVa5GIXO C+g9VtrW0Mwe1VaImOK94k3ThO9O7wY= Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A803E2C46; Mon, 8 Sep 2025 00:40:55 -0700 (PDT) Received: from e123572-lin.arm.com (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 553163F63F; Mon, 8 Sep 2025 00:40:59 -0700 (PDT) From: Kevin Brodsky To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Alexander Gordeev , Andreas Larsson , Andrew Morton , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , David Hildenbrand , "David S. Miller" , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org Subject: [PATCH v2 6/7] sparc/mm: support nested lazy_mmu sections Date: Mon, 8 Sep 2025 08:39:30 +0100 Message-ID: <20250908073931.4159362-7-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250908073931.4159362-1-kevin.brodsky@arm.com> References: <20250908073931.4159362-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: BCDEA4000A X-Stat-Signature: ht44nqsh78a3frc1tpjfyfqgwrrhd3rh X-Rspam-User: X-HE-Tag: 1757317264-74882 X-HE-Meta: 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 np5ORd5j sPdYrF5mbXTY37lA+zQHbLZFdy10klj9LatBkv2+kNFWZ6o4MIZ+F32ppDxIH+3whZqF33SMo8Acxw2P66xfWyJ5LzkKmxNt14OPK9FkakWcCRwWkOE+PcHq7TZfBV8y7Pz4kiKa+IlHPxI35hGqFQejjaC0Khe/TtSg/uHLE/mvv4o/0h5ivCfG+dR1yuQfCnbMCMcVbiFi5iq8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The lazy_mmu API now allows nested sections to be handled by arch code: enter() can return a flag if called inside another lazy_mmu section, so that the matching call to leave() leaves any optimisation enabled. This patch implements that new logic for sparc: if there is an active batch, then enter() returns LAZY_MMU_NESTED and the matching leave() leaves batch->active set. The preempt_{enable,disable} calls are left untouched as they already handle nesting themselves. TLB flushing is still done in leave() regardless of the nesting level, as the caller may rely on it whether nesting is occurring or not. Signed-off-by: Kevin Brodsky --- arch/sparc/mm/tlb.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/arch/sparc/mm/tlb.c b/arch/sparc/mm/tlb.c index bf5094b770af..fdc33438b85f 100644 --- a/arch/sparc/mm/tlb.c +++ b/arch/sparc/mm/tlb.c @@ -56,9 +56,13 @@ lazy_mmu_state_t arch_enter_lazy_mmu_mode(void) preempt_disable(); tb = this_cpu_ptr(&tlb_batch); - tb->active = 1; - return LAZY_MMU_DEFAULT; + if (!tb->active) { + tb->active = 1; + return LAZY_MMU_DEFAULT; + } else { + return LAZY_MMU_NESTED; + } } void arch_leave_lazy_mmu_mode(lazy_mmu_state_t state) @@ -67,7 +71,10 @@ void arch_leave_lazy_mmu_mode(lazy_mmu_state_t state) if (tb->tlb_nr) flush_tlb_pending(); - tb->active = 0; + + if (state != LAZY_MMU_NESTED) + tb->active = 0; + preempt_enable(); } -- 2.47.0