From patchwork Tue Jun 25 19:07:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Cooper X-Patchwork-Id: 13711852 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E7DD3C3065D for ; Tue, 25 Jun 2024 19:07:45 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.748027.1155606 (Exim 4.92) (envelope-from ) id 1sMBVq-0000vw-DU; Tue, 25 Jun 2024 19:07:30 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 748027.1155606; Tue, 25 Jun 2024 19:07:30 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1sMBVq-0000vB-4c; Tue, 25 Jun 2024 19:07:30 +0000 Received: by outflank-mailman (input) for mailman id 748027; Tue, 25 Jun 2024 19:07:28 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1sMBVo-00008w-O0 for xen-devel@lists.xenproject.org; Tue, 25 Jun 2024 19:07:28 +0000 Received: from mail-ed1-x52b.google.com (mail-ed1-x52b.google.com [2a00:1450:4864:20::52b]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 2a229ede-3326-11ef-90a3-e314d9c70b13; Tue, 25 Jun 2024 21:07:28 +0200 (CEST) Received: by mail-ed1-x52b.google.com with SMTP id 4fb4d7f45d1cf-57d07f07a27so6758519a12.3 for ; Tue, 25 Jun 2024 12:07:28 -0700 (PDT) Received: from andrewcoop.eng.citrite.net ([160.101.139.1]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a725d7b190fsm180434766b.50.2024.06.25.12.07.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Jun 2024 12:07:26 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 2a229ede-3326-11ef-90a3-e314d9c70b13 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.com; s=google; t=1719342447; x=1719947247; darn=lists.xenproject.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Fy0Ve82OeeZoLYNkYstdewJQpe9Npq/P9dEBPwXzBhw=; b=GKx6sqQ7t+Feqy/jhMpBsGnVSZXS2svgsxl36T2F3tr/R9XUveQFDZFIYiYk6dHc/E 9u4TueOLdLnM3JCmVnsoZJXpU+ZNYrDDGDVn19dAZcujvcRgRHujQ7BTOExFFXVHc2Fz Y1dktfqhQAC5Zki8BxfMFYTM+F6WLW4qWfMNo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719342447; x=1719947247; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Fy0Ve82OeeZoLYNkYstdewJQpe9Npq/P9dEBPwXzBhw=; b=whrnoK4KC1HmmOdMQNICN0KzC3YUFUoP2noi+bl+FMt1+IDSFhbZlUGFMJXPrOJEoH IvndQaiQxYRz4HA6e/mMUD/l1tvgiMX8CESyVhOEAOUBCwXsTEkfMUEDRlCAlFx/Ecyv 0mdLG1EMiToo1jQ3bnP3vZ1eoEFNBQLrrZ/QdQxGEmdvULHlAVYIkF2K1+KwUCT917cz T35KfuUmJ6WErgzEzJRqWETKbW4Hvz/fTOENRPLZxRWPmyHpFN6xpHj82bVlJXmP1xvF 8OEy8zgTazpiNlyxuO/8JN7CAhFnyeEvSJz6bRc0n7JZzDe9O6QiDBPTRRh8JwwszYMn CsUw== X-Gm-Message-State: AOJu0Yyp+fXgGRERcPF3ICWSEk23rSYVFyg48z2tAajpEhGHFORT4YCK IXyFK/n2XioLnjUwz1wWL55YIJni0GigicvIcR1BHDlhmHP1gvhLGkOA/Vj1AYaDtOhsj80zBzB aQBU= X-Google-Smtp-Source: AGHT+IFtdpbsqg8qlXa1oBwhSkY9AFdg41EFbjwtjMAZJsCOUe08bxR94vYnzxzecRZqHGxMo1Bgew== X-Received: by 2002:a17:907:c78e:b0:a72:4b31:13b5 with SMTP id a640c23a62f3a-a727f855270mr120272966b.54.1719342447117; Tue, 25 Jun 2024 12:07:27 -0700 (PDT) From: Andrew Cooper To: Xen-devel Cc: Andrew Cooper , Stefano Stabellini , Julien Grall , Volodymyr Babchuk , Bertrand Marquis , Michal Orzel Subject: [PATCH 5/6] ARM/vgic: Use for_each_set_bit() in vgic_set_irqs_pending() Date: Tue, 25 Jun 2024 20:07:18 +0100 Message-Id: <20240625190719.788643-6-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240625190719.788643-1-andrew.cooper3@citrix.com> References: <20240625190719.788643-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 ... which is better optimised for scalar values, rather than using the arbitrary-sized bitmap helpers. For ARM32: add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-16 (-16) Function old new delta vgic_set_irqs_pending 284 268 -16 including removing calls to _find_{first,next}_bit_le(), and two stack-spilled words too. For ARM64: add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-40 (-40) Function old new delta vgic_set_irqs_pending 268 228 -40 including removing three calls to find_next_bit(). Signed-off-by: Andrew Cooper --- CC: Stefano Stabellini CC: Julien Grall CC: Volodymyr Babchuk CC: Bertrand Marquis CC: Michal Orzel TODO: These were debug builds, and I need to redo the analysis with release builds. Also extend to the other examples. --- xen/arch/arm/vgic.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c index 57519e834d78..c060676aee78 100644 --- a/xen/arch/arm/vgic.c +++ b/xen/arch/arm/vgic.c @@ -421,15 +421,13 @@ void vgic_enable_irqs(struct vcpu *v, uint32_t r, unsigned int n) void vgic_set_irqs_pending(struct vcpu *v, uint32_t r, unsigned int rank) { - const unsigned long mask = r; - unsigned int i; /* The first rank is always per-vCPU */ bool private = rank == 0; /* LPIs will never be set pending via this function */ ASSERT(!is_lpi(32 * rank + 31)); - bitmap_for_each( i, &mask, 32 ) + for_each_set_bit ( i, r ) { unsigned int irq = i + 32 * rank;