From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ale.deltatee.com (ale.deltatee.com [204.191.154.188]) (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 E144033937F; Tue, 4 Aug 2026 19:55:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=204.191.154.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785873317; cv=none; b=MwpOfD2JwpOcVzdDu5pDEtGvrM0AQpcnRwdnth4ba8+9pHCjsZFcIPRB374gIuh9VLKOtsT4ifER9/reEVOtlBPz6y4UkpnKSnGDJN8aSRQXUnewpWxxBueWXu7GnAPDA8q0jwcVI1FDuTzABJCL3mwhTDhVRCyTNh9n9Ys3cUI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785873317; c=relaxed/simple; bh=vvX0SUrqtLD2pui/FRqfojoBMRp5wiNUILlNKOl4gTo=; h=Message-ID:Date:MIME-Version:To:Cc:References:From:In-Reply-To: Content-Type:Subject; b=F76QhzLx6gAhuYRK17kqLPQZqaEq+xl8Up1KegGNIejjrWkeJixWAMggM/tvhToma3kCQgo6gybE/Ki3c8BJb14JkB2nHiybo/IEbHbdlsVSjeWze/1iLusbq7gSh0fRujki0xLfjF5i0npAZpvGHm75jhzlgiCCSD6N2sb9/co= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com; spf=pass smtp.mailfrom=deltatee.com; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b=aI8HQUHT; arc=none smtp.client-ip=204.191.154.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=deltatee.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b="aI8HQUHT" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:In-Reply-To:From:References:Cc:To: MIME-Version:Date:Message-ID:content-disposition; bh=bsnCJMRW1Wojan2LSrAzGGxy38kiy/p2s1JUs40QzZQ=; b=aI8HQUHTXi5qWuc7EJvAsYdr94 lqSFrmp8J/9XetxN+cPUxt+Uub3KaSeA1Junv4OalKW1O29smsm6xTaTGoveUP4q/npRPOe8F2xjD 3y617RUcHo/sALDW/UffWAtNJAz94cQ5qL1KGcSZqcArc1xb8pl1IuX7o7U8iU5cEpps7NLUxVQtm N9/v/3Uw1+CJQjDtWnXv49+2ZcwQVOQdISdaqm1geY4HYfhyMMsFKq+jWrNmTK66bP1F1wdnb7AL4 yegS3U1GcYUxPQ2AmUb8trXfjXPGTZzZmAEpbC5eIHiwG7ZR8HsVF79Hju9QjkUWbgY2toBB6XdXQ +KY4Gonw==; Received: from guinness.priv.deltatee.com ([172.16.1.162]) by ale.deltatee.com with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.98.2) (envelope-from ) id 1wrLEH-000000000hg-37jK; Tue, 04 Aug 2026 13:55:14 -0600 Message-ID: Date: Tue, 4 Aug 2026 13:55:13 -0600 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Leon Romanovsky , Bjorn Helgaas , Jonathan Corbet , Shuah Khan , Alex Williamson Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org References: <20260802-fix-p2p-acs-v1-0-a7c5eb64fff6@nvidia.com> <20260802-fix-p2p-acs-v1-3-a7c5eb64fff6@nvidia.com> Content-Language: en-CA From: Logan Gunthorpe In-Reply-To: <20260802-fix-p2p-acs-v1-3-a7c5eb64fff6@nvidia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 172.16.1.162 X-SA-Exim-Rcpt-To: leon@kernel.org, bhelgaas@google.com, corbet@lwn.net, skhan@linuxfoundation.org, alex@shazbot.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org X-SA-Exim-Mail-From: logang@deltatee.com X-Spam-Level: Subject: Re: [PATCH 03/13] PCI/P2PDMA: Document the Address Type assumption X-SA-Exim-Version: 4.2.1 (built Sun, 23 Feb 2025 07:57:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) On 2026-08-02 09:09, Leon Romanovsky wrote: > From: Leon Romanovsky > > P2PDMA selects a mapping from the ACS controls that govern Requests > carrying an Untranslated address. PCIe r7.0, sec 6.12.3 routes a Request > carrying a Translated address directly to the peer whenever ACS Direct > Translated P2P is enabled, regardless of P2P Request Redirect and P2P > Egress Control. > > An ATS capable client can therefore reach the peer on the direct path > whichever mapping is selected. Record that assumption. > > Signed-off-by: Leon Romanovsky LGTM Reviewed-by: Logan Gunthorpe