From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) (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 E4369249E4 for ; Thu, 4 Jan 2024 13:47:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b="kNGgoupT" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=F677DMlRFfuOUxBej40MkJ2lKltaDghuaAWCmf8gXQc=; b=kNGgoupTyPl+j4/PRccqDi2z3C 0o9MWQTpGOF9dHAykolfZqHfEiToZnpkRso5xbWtzkg3c6smypF6KVEQyXOIMJfZWaEIyU9B/t4Ez Vc0KgQvROqJbwhRtmlZUZMcnagFha04mM+w+Cd4nmoPyIkpEAwuJnTyYYiSww9HBw6T6L8HUX3lxI B601V+ybZhS3eYHpfc1n9k6wqjo2XYc0mPMLI2GTaOAgRdEm0z4OWIedwaLyMFPxoCgWmRu8t/A/D d595mNaS9SnWqMG36YT9dxxDnBIBn3Cmutf5VkjtR8tSp+fjiY/3ClayKL14RMkEOBr5BFhdoj7ev 8RseZWLA==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:48000) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1rLO4W-00005k-1G; Thu, 04 Jan 2024 13:47:44 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1rLO4W-0007Tl-A0; Thu, 04 Jan 2024 13:47:44 +0000 Date: Thu, 4 Jan 2024 13:47:44 +0000 From: "Russell King (Oracle)" To: "Rafael J. Wysocki" Cc: Marc Zyngier , Lorenzo Pieralisi , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, acpica-devel@lists.linux.dev, Mark Rutland , Robin Murphy , Fang Xiang , Robert Moore Subject: Re: [PATCH v4 0/3] irqchip/gic-v3: Enable non-coherent GIC designs probing Message-ID: References: <20230905104721.52199-1-lpieralisi@kernel.org> <20231227110038.55453-1-lpieralisi@kernel.org> <86h6jt9vs7.wl-maz@kernel.org> Precedence: bulk X-Mailing-List: acpica-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: Russell King (Oracle) On Thu, Jan 04, 2024 at 02:21:44PM +0100, Rafael J. Wysocki wrote: > On Thu, Jan 4, 2024 at 1:04 PM Russell King (Oracle) > wrote: > > > > On Thu, Jan 04, 2024 at 11:34:48AM +0000, Marc Zyngier wrote: > > > On Wed, 03 Jan 2024 13:43:16 +0000, > > > "Rafael J. Wysocki" wrote: > > > > > > > > On Wed, Dec 27, 2023 at 12:00 PM Lorenzo Pieralisi > > > > wrote: > > > > > > > > > > This series is v4 of previous series: > > > > > > > > > > v3: https://lore.kernel.org/all/20231006125929.48591-1-lpieralisi@kernel.org > > > > > v2: https://lore.kernel.org/all/20230906094139.16032-1-lpieralisi@kernel.org > > > > > v1: https://lore.kernel.org/all/20230905104721.52199-1-lpieralisi@kernel.org > > > > > > > > > > v3 -> v4: > > > > > - Dropped patches [1-3], already merged > > > > > - Added Linuxized ACPICA changes accepted upstream > > > > > - Rebased against v6.7-rc3 > > > > > > > > > > v2 -> v3: > > > > > - Added ACPICA temporary changes and ACPI changes to implement > > > > > ECR https://bugzilla.tianocore.org/show_bug.cgi?id=4557 > > > > > - ACPI changes are for testing purposes - subject to ECR code > > > > > first approval > > > > > > > > > > v1 -> v2: > > > > > - Updated DT bindings as per feedback > > > > > - Updated patch[2] to use GIC quirks infrastructure > > > > > > > > > > Original cover letter > > > > > --- > > > > > The GICv3 architecture specifications provide a means for the > > > > > system programmer to set the shareability and cacheability > > > > > attributes the GIC components (redistributors and ITSes) use > > > > > to drive memory transactions. > > > > > > > > > > Albeit the architecture give control over shareability/cacheability > > > > > memory transactions attributes (and barriers), it is allowed to > > > > > connect the GIC interconnect ports to non-coherent memory ports > > > > > on the interconnect, basically tying off shareability/cacheability > > > > > "wires" and de-facto making the redistributors and ITSes non-coherent > > > > > memory observers. > > > > > > > > > > This series aims at starting a discussion over a possible solution > > > > > to this problem, by adding to the GIC device tree bindings the > > > > > standard dma-noncoherent property. The GIC driver uses the property > > > > > to force the redistributors and ITSes shareability attributes to > > > > > non-shareable, which consequently forces the driver to use CMOs > > > > > on GIC memory tables. > > > > > > > > > > On ARM DT DMA is default non-coherent, so the GIC driver can't rely > > > > > on the generic DT dma-coherent/non-coherent property management layer > > > > > (of_dma_is_coherent()) which would default all GIC designs in the field > > > > > as non-coherent; it has to rely on ad-hoc dma-noncoherent property handling. > > > > > > > > > > When a consistent approach is agreed upon for DT an equivalent binding will > > > > > be put forward for ACPI based systems. > > > > > > > > > > Lorenzo Pieralisi (3): > > > > > ACPICA: MADT: Add GICC online capable bit handling > > > > > ACPICA: MADT: Add new MADT GICC/GICR/ITS non-coherent flags handling > > > > > irqchip/gic-v3: Enable non-coherent redistributors/ITSes ACPI probing > > > > > > > > > > drivers/acpi/processor_core.c | 21 +++++++++++++++++++++ > > > > > drivers/irqchip/irq-gic-common.h | 8 ++++++++ > > > > > drivers/irqchip/irq-gic-v3-its.c | 4 ++++ > > > > > drivers/irqchip/irq-gic-v3.c | 9 +++++++++ > > > > > include/acpi/actbl2.h | 12 ++++++++++-- > > > > > include/linux/acpi.h | 3 +++ > > > > > 6 files changed, 55 insertions(+), 2 deletions(-) > > > > > > > > > > -- > > > > > > > > I can apply the first 2 patches, but I would need an ACK for the 3rd one. > > > > > > > > Alternatively, feel free to add > > > > > > > > Acked-by: Rafael J. Wysocki > > > > > > > > to the first 2 patches and route them via ARM64. > > > > > > Thanks for that. I have some comments on the third patch, which I'd > > > like to see addressed beforehand. This is probably all 6.9 material > > > anyway (nobody is affected by this so far). > > > > From a purely selfish point of view, it would be useful to have the > > first patch merged merely to reduce the burden of patches for vcpu > > hotplug. > > OK, since there will be at least one more iteration of patch [3/3] > AFAICS, I'll queue up patches [1-2/3] for 6.8 (next week, though). Thanks! -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last! 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