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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 AD83EC5AD49 for ; Tue, 3 Jun 2025 07:52:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=9mWWJ4qkLqAKjbZWE9dxZ2w1NtcxwU3up5LkH0O13tA=; b=YhcKLNjDJ7JmcKgI0pF3dLCh4L 914dOq7gys10ryADW6rpo9nOyG02tWQViiXcM+M9b8ACYJ0MqYpNpQVeey7fDiSpVJs02fZ9w8BAY NIsjy0R6qgcWXtHMM1w7h5w1BZpHTh4LzyUxOp5LCZhy0qsAksfS6U5Ex+Pr+WjscxGg7CKQqPK0P WPDIRfmxV3LHEcbD8Vemw4PP2u7a7MVyI0eziVpcSqHENnmuzS73v9Y48mAfFyQoB4mKckylGcWuD nvq9aRmpSpJ5PMVgx0DDwYrdl5AHLeJN62ncxnwnISxVCTTVNJgQNsFA8aPVqeFn8ahMBP7WBZoSf tHUaVHug==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uMMRN-0000000ACxp-2FA0; Tue, 03 Jun 2025 07:52:09 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uMMNf-0000000ACC4-1wVL for linux-arm-kernel@lists.infradead.org; Tue, 03 Jun 2025 07:48:20 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id AC37744D39; Tue, 3 Jun 2025 07:48:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9A4DC4CEED; Tue, 3 Jun 2025 07:48:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748936898; bh=7/E2PZuS4xuO6ru4tVmW9wWcgEN+UdjTQfwPp/jVbLw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=bPJcWEegGmPrknxY/HQNjWITDH1jVIsj4qm7CIV5o0hvAbjeGtz7MW8+a3SNZdCdh bc4OTGVFjVCTT+oF/GR0JZaZb1IuazvjGxfnM4IiEdeHtBJlz3r63lvs8HbRLKfvVo aK/AtHpjGbJoA2A6tANmgeArsq7kixhM6Ed8ymmBY6aCvhA4dScXcFCk5TlsJq36J6 lbyaZdo9Ardhe6ixAg/j6vFNdrNDrrN6mIPak3Jx2uBsn63RJUapN7K6rUayoMnAvr ttEEp6wtGPOyk9yQFW0wATtiPcDApPZ9NhKfiKVShk2e/Zr0Mh4RwZEOD18UU9Q6GH ZOTyDZfjE8w/A== Date: Tue, 3 Jun 2025 09:48:09 +0200 From: Lorenzo Pieralisi To: Peter Maydell , Rob Herring , Krzysztof Kozlowski Cc: Marc Zyngier , Thomas Gleixner , Conor Dooley , Catalin Marinas , Will Deacon , andre.przywara@arm.com, Arnd Bergmann , Sascha Bischoff , Timothy Hayes , "Liam R. Howlett" , Mark Rutland , Jiri Slaby , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, suzuki.poulose@arm.com Subject: Re: [PATCH v4 01/26] dt-bindings: interrupt-controller: Add Arm GICv5 Message-ID: References: <20250513-gicv5-host-v4-0-b36e9b15a6c3@kernel.org> <20250513-gicv5-host-v4-1-b36e9b15a6c3@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250603_004819_546895_B1D18606 X-CRM114-Status: GOOD ( 28.84 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, May 29, 2025 at 02:17:26PM +0100, Peter Maydell wrote: > On Thu, 29 May 2025 at 13:44, Lorenzo Pieralisi wrote: > > > > [+Andre, Peter] > > > > On Tue, May 13, 2025 at 07:47:54PM +0200, Lorenzo Pieralisi wrote: > > > + reg: > > > + minItems: 1 > > > + items: > > > + - description: IRS control frame > > > > I came across it while testing EL3 firmware, raising the topic for > > discussion. > > > > The IRS (and the ITS) has a config frame (need to patch the typo > > s/control/config, already done) per interrupt domain supported, that is, > > it can have up to 4 config frames: > > > > - EL3 > > - Secure > > - Realm > > - Non-Secure > > > > The one described in this binding is the non-secure one. > > > > IIUC, everything described in the DT represents the non-secure address > > space. > > The dt bindings do allow for describing Secure-world devices: > Documentation/devicetree/bindings/arm/secure.txt has the > details. We use this in QEMU so we can provide a DTB to > guest EL3 firmware that tells it where the hardware is > (and which EL3 can then pass on to an NS kernel). It would > be helpful for the GICv5 binding to be defined in a way that > we can do this for a GICv5 system too. It would be good to understand what DT {should/should not} describe and whether this DT usage to configure firmware is under the DT maintainers radar or it is an attempt at reusing it to avoid implementing a configuration scheme. Rob, Krzysztof, Any thoughts on the matter please ? [...] > The tempting thing to do is to have regs[] list the frames > in some given order, but the spec makes them not simple > supersets, allowing all of: > * NS > * S > * NS, S, EL3 > * NS, Realm, EL3 > * NS, Realm, S, EL3 Maybe reg-names can help ? Even though first we need to understand what resources should be described in DT. Current bindings are reviewed and I am not keen on dragging this discussion on forever - the information the kernel requires is there, I'd like to bring this to a close. Thanks, Lorenzo > > secure.txt says: > # The general principle of the naming scheme for Secure world bindings > # is that any property that needs a different value in the Secure world > # can be supported by prefixing the property name with "secure-". So for > # instance "secure-foo" would override "foo". > > So maybe we could have > reg : the NS frame(s) > secure-reg : the S frame(s) > realm-reg : the Realm frame(s) > root-reg : the EL3 frame(s) > > ?? > > thanks > -- PMM