From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qv1-f47.google.com (mail-qv1-f47.google.com [209.85.219.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1B4F01FF1AE for ; Wed, 17 Dec 2025 15:19:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.47 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765984798; cv=none; b=BMKeCHmhQmM/hYJ8woCvXlp86S/4hoEET3yNP9X5wk4kemIwFgWTQIut7LO6TbJYL/N/fL02LiFGAZE8d61fuhONkatt2f0/z8eJCJJEi5/4f+EYVqBJFxpMq7EdbPFZMfjT3Tf3pkJSAnuZHPxSyZARUk3CgBtQeqiLBWI23bs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765984798; c=relaxed/simple; bh=w09mEle/83MrqdWuYBx70gmLmKQyKlIHpYyvZMInlts=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=l4Z67dRG07OOaMoHm8YUY7SDJNS5yJbBRRV4WnzeIqVP2y9DcysUGcYjoc7rxsJHKrFwWqFMY63WnTFnz6KgUEr6QrK5cPoq/lI0QXlzD+Wwj1dpfSfBZtLnQY4Kggy2bsH0G/M6YFlG5+knSFlx0SroOTg+B20ge1yopnMwVXQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca; spf=pass smtp.mailfrom=ziepe.ca; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b=ordEiJjJ; arc=none smtp.client-ip=209.85.219.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="ordEiJjJ" Received: by mail-qv1-f47.google.com with SMTP id 6a1803df08f44-8888a444300so45652516d6.1 for ; Wed, 17 Dec 2025 07:19:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1765984794; x=1766589594; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=vxrhj48Q2FAUnhlUyBprvMI5hH+9ez7d9ool74khOYc=; b=ordEiJjJoYbgJ2voN2AXY5IGFRQnvCAmUA99nTQyhdR587kZxbApDaQt/lI8yRHE9z 7thSRea9GEtC0WKdA6gD3N8PyGJZKG5+Vc2QPLIXHXTK+8uH8z++SQPGQc0uGs6eakax ltBOFdQoAsoBERcw06QFKKETNAwn9b0K4Gw6C8YAJHfNIrm43lUZOspvyoccHv+yRlbv J7vgQgJUMTaFALcWff3AR8rXDLwbk6npZ5kDpngxYvK7I/MGyl8K7NPnwPL+dMsZV+5a TBbx1YygeFYwOBQ7sOze4TiCQj9oATNod0KfIGFVpJUSMdSa2ly4nTAEWcD65ObBVWPJ KFow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765984794; x=1766589594; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=vxrhj48Q2FAUnhlUyBprvMI5hH+9ez7d9ool74khOYc=; b=InBb/J+LS6zH5dXYkBwFY/2MC2jIrZ1JcJwupj20zYSUhJ3P3XTRIRwgGWnPhd2HqQ AKiyQMIckQqhjYq2hb8jm1edvxB24VaYSCq6JWZlSLEXihuAPFDdeh7pz0sHfgfXv2Ye l1KQncpFDJL+vaAaMdUAnPX1gf5fJc6+nV/GnbZioR/P3XNt1MX4u2oPsARotVfZEiTi lRyTbESjUfTSl/02Z4eMgE4aszWusF1yQbn+LmUrrrKGFJWbtTs9eD4rYUWv5jNQmrRo PdHuDrJI+IMD/Tav0cr64OcHIc7CEF8PcCyJLe3OHPJZRgSsw9/avUtduPCUtVPxCQJD CpKQ== X-Forwarded-Encrypted: i=1; AJvYcCVyvpVIIynpWP55E4ZiD7LXdM2WBGJlyfelnsp7ESGKYt407SlyLGF13UaEsR4FPtwys2UQS7FMhtBfV+k=@vger.kernel.org X-Gm-Message-State: AOJu0YwVQSkhRIZz/GGDMxLeuTNQCQlC4diIOxz9JdAW3YkZ+GhmE0GX 2ql7qW6aKVZuKpFJUg0oYy62dXsLVDgZ34Ar0BS+c9JrxBL1ujMi5Nn39f7ucRkTjFU= X-Gm-Gg: AY/fxX6yOfPEBCaLcdbdDqoVCZMtudnbzuM0Hs6VF+E3Lm5OixQSbOZLeGYwRb8fIFb 33kgo7b7bGMlhjkXq1deTv/moYLFBo30bPDgTVZ9PzlLg01leOm2+yf9do3aB2ZtEB66LOUjasq QaysVxNqX7f38E+GUJVVNWgT+Z3ATnEW/lHd6KkQ2IePF5loiwG52dNThDu+6F+IMygB4t+fRKx eZNppY5wBoFbT9Fryz4KvSBdEqs7mEoHxcLwBqqgIOIiJd6D2BMPKQbxCfHfatoD0J4XuDvWK6s glupx1ZfOQjpBplkNDnVMfyl2xKWJS0AzhBMAEyR5NJqXmUPH7GhLQt4Gz2LObyPqys3Rkyf6MH JiiKjWcTq5XXelbzlnLXOi8PaPoZkJ9wO4oLaratfrDsTM3OSOaY0lykilqesADZDqqPrAY1VGk s0GMdBAsFAE1VQkzFvujMjE3UdiaB68btVj0/zCq2Mwr6oFhnCZM/UoKDK X-Google-Smtp-Source: AGHT+IEeo4DfupIp4K/iDP3a2ivWiR3/Wwq/tP1+vTPnDZ7ZmGlvxllQ8uMMWjnMBj8/Zu8fu6Z/FQ== X-Received: by 2002:a05:6214:4601:b0:88a:2fb5:a085 with SMTP id 6a1803df08f44-88a2fb5a22dmr183537496d6.63.1765984793976; Wed, 17 Dec 2025 07:19:53 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-47-55-120-4.dhcp-dynamic.fibreop.ns.bellaliant.net. [47.55.120.4]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8899e7598c7sm96636706d6.28.2025.12.17.07.19.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Dec 2025 07:19:53 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vVtJg-00000000jxk-3jhU; Wed, 17 Dec 2025 11:19:52 -0400 Date: Wed, 17 Dec 2025 11:19:52 -0400 From: Jason Gunthorpe To: Manivannan Sadhasivam Cc: Manivannan Sadhasivam , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, Naresh Kamboju , Pavankumar Kondeti , Xingang Wang , Marek Szyprowski , Robin Murphy Subject: Re: [PATCH v2 3/4] PCI: Disable ACS SV capability for the broken IDT switches Message-ID: <20251217151952.GG31492@ziepe.ca> References: <20251202-pci_acs-v2-0-5d2759a71489@oss.qualcomm.com> <20251202-pci_acs-v2-3-5d2759a71489@oss.qualcomm.com> <20251202191533.GI812105@ziepe.ca> <4d3asssmv5xkttasl2xl2f6q3l5ki4jxmsrbyy6hvrd7djgsnj@y7drlazpwzi3> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4d3asssmv5xkttasl2xl2f6q3l5ki4jxmsrbyy6hvrd7djgsnj@y7drlazpwzi3> On Tue, Dec 09, 2025 at 08:20:39PM +0900, Manivannan Sadhasivam wrote: > On Tue, Dec 02, 2025 at 03:15:33PM -0400, Jason Gunthorpe wrote: > > On Tue, Dec 02, 2025 at 07:52:50PM +0530, Manivannan Sadhasivam wrote: > > > @@ -544,6 +544,7 @@ struct pci_dev { > > > #endif > > > u16 acs_cap; /* ACS Capability offset */ > > > u16 acs_capabilities; /* ACS Capabilities */ > > > + u16 acs_broken_cap; /* Broken ACS Capabilities */ > > > > Why do we need this? Have the quirk function accep tthe > > acs_capabilities from the register and return the value to program > > into struct pci_dev ? > > > > We dont have any quirk levels between pci_acs_init() and pci_acs_enable() that > will allow us to modify pci_dev::acs_capabilities in the quirk function. Hence, > I came up with one more member to pass the broken caps. Call the quirk function directly from the ACS path? We have things like that already for ACS? Jason