From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BC1BD441630 for ; Mon, 7 Sep 2026 08:56:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788771411; cv=none; b=G69pSe4KufawMfdwwte45fz52rjy4cQJE3W3qd64OXhbsgDP6wbM1/gRdA5DdYfheVGQggrdZrcj3ihsGxNVm71XFMiGg/d36cSXVO2+/qagLtv97tPJTvPeJ9wzv9PGfmVHmaWf8MOVfph+Dj4ZVpeNI6wu2mz9ZeaEKm9aJyc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788771411; c=relaxed/simple; bh=76OMI6WRLkvF3huS5s8aBnc2/15bNq4jh32jVZlnBtQ=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=AJF6cIZyAFHKyMpi0HE2IarczPaefKohezSdFXq1gANyb1hQdKR3YKvg/jxDiKSBdUcmOrpYQDt2FJdHQGXmO2yLRT14muKKt5TOixEcX8rE6jIFxaqHj2+TMTnhHMt0tSquFleJvUXkDPWEpalZ2pQd25JgJLZ89kZyq2IUZUU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MvheHASs; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MvheHASs" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5D52E1F00A3A; Mon, 7 Sep 2026 08:56:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788771410; bh=N6bWIpFfXhqGihNnzoE3exOZDCPPpubbizpznVgNBKk=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=MvheHASsRLl5BGpuNyuoniZlretbpywNtzuA3qmGwLnux9kgn5bWsMIoGp/Cn2/Ut ZHoehtzgHDUyW7dlL1CmuYGToBEBlhThscOcYYJzDv4+kwQdY7CuG0aDcbheZsxCDn lKQl2yXhf2kk+gJwgMOfV+S4N9h+VNaab9saVXwxEd2vF7jB2IKl1IPz+1vwNqbYnL vVvIo3C3TTIVC5agFcs+vDIwc3q24TyTt3EBG6vQ0EtMSNgqrSpzuVOzKm/bBxYifD J0a8AUYR7Fq4DigmXmMx1ZC6TK2RjXVHcoRz2ku1ROq6zBD2jVqjVyXPvuw4SmOev+ WdmxLDM5uRHbw== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1x3V9k-00000005fG9-1bGF; Mon, 07 Sep 2026 08:56:48 +0000 Date: Mon, 07 Sep 2026 09:56:48 +0100 Message-ID: <86ik4h4ey7.wl-maz@kernel.org> From: Marc Zyngier To: Adrian Ng Ho Yin Cc: tglx@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5] irqchip/gic-v3: Add Altera SoCFPGA Agilex5 GIC600 DMA32 erratum workaround In-Reply-To: References: User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: adrian.ho.yin.ng@altera.com, tglx@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Mon, 07 Sep 2026 09:22:59 +0100, Adrian Ng Ho Yin wrote: > > Agilex5 integrates GIC600 with an ACE-lite interface limited to a 32-bit > address bus, so the ITS can only access the first 4 GB of physical address > space. Register intel,socfpga-agilex5 on the existing > dma_32bit_impaired_platforms list so ITS allocations use GFP_DMA32. > > The workaround is guarded by ALTERA_ERRATUM_AGILEX5_2_1_23, which is > selected by ARCH_INTEL_SOCFPGA as all Agilex5 devices are affected. > > This limitation is documented as Agilex 5 ES Device Errata 2.1.23 (825514). > > Signed-off-by: Adrian Ng Ho Yin Reviewed-by: Marc Zyngier M. -- Without deviation from the norm, progress is not possible.