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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 1x92fD-0000000FjgX-1I9v; Tue, 22 Sep 2026 09:44:12 -0600 Message-ID: Date: Tue, 22 Sep 2026 09:43:56 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Leon Romanovsky Cc: Bjorn Helgaas , Chaitanya Kulkarni , Greg Kroah-Hartman , Jens Axboe , Alex Williamson , Ankit Agrawal , Jason Gunthorpe , Jonathan Corbet , Shuah Khan , "Joerg Roedel (AMD)" , Will Deacon , Robin Murphy , Randy Dunlap , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, iommu@lists.linux.dev, Tushar Dave , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-rdma@vger.kernel.org, kvm@vger.kernel.org References: <20260920-fix-p2p-acs-v4-0-v7-0-ca0828ab697c@nvidia.com> <20260920-fix-p2p-acs-v4-0-v7-15-ca0828ab697c@nvidia.com> <85bb90f0-5a02-4e35-9ed6-ad7e67c1c0d8@deltatee.com> <20260922092754.GC563127@unreal> Content-Language: en-CA From: Logan Gunthorpe In-Reply-To: <20260922092754.GC563127@unreal> 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, kch@nvidia.com, gregkh@linuxfoundation.org, axboe@kernel.dk, alex@shazbot.org, ankita@nvidia.com, jgg@ziepe.ca, corbet@lwn.net, skhan@linuxfoundation.org, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, rdunlap@infradead.org, sumit.semwal@linaro.org, christian.koenig@amd.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, iommu@lists.linux.dev, tdave@nvidia.com, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-rdma@vger.kernel.org, kvm@vger.kernel.org X-SA-Exim-Mail-From: logang@deltatee.com X-Spam-Level: Subject: Re: [PATCH v7 15/19] PCI/P2PDMA: Document TLP-class routing 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 2026-09-22 03:27, Leon Romanovsky wrote: > On Mon, Sep 21, 2026 at 04:16:56PM -0600, Logan Gunthorpe wrote: >> >> >> On 2026-09-20 05:41, Leon Romanovsky wrote: >>> +A path is bus addressable only where both directions route directly, so with >>> +nothing enabled every class is. >> >> I don't understand the sentence. > > I tried to say that we need both Requests and Completions route > directly. > > Claude suggested something like that: > --------------------------------------------------------------------------- > Combining the two tables gives the mapping type: a class is bus addressable > when its Request and its Completions both route directly, a blocked Request > is not supported because Translation Blocking rejects the Address Type > wherever the Request is addressed, and anything else goes through the host > bridge. With no ACS control set anywhere, every class routes directly. > --------------------------------------------------------------------------- That's much more understandable. Thanks. Logan