From: Logan Gunthorpe <logang@deltatee.com>
To: "Leon Romanovsky" <leon@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Chaitanya Kulkarni" <kch@nvidia.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Jens Axboe" <axboe@kernel.dk>,
"Alex Williamson" <alex@shazbot.org>,
"Ankit Agrawal" <ankita@nvidia.com>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Jonathan Corbet" <corbet@lwn.net>,
"Shuah Khan" <skhan@linuxfoundation.org>,
"Joerg Roedel (AMD)" <joro@8bytes.org>,
"Will Deacon" <will@kernel.org>,
"Robin Murphy" <robin.murphy@arm.com>,
"Randy Dunlap" <rdunlap@infradead.org>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, iommu@lists.linux.dev,
Tushar Dave <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
Subject: Re: [PATCH v7 11/19] PCI/P2PDMA: Log detailed ACS routing diagnostics
Date: Mon, 21 Sep 2026 15:19:40 -0600 [thread overview]
Message-ID: <9e868c06-be53-436c-a78d-790ed2b91c3e@deltatee.com> (raw)
In-Reply-To: <20260920-fix-p2p-acs-v4-0-v7-11-ca0828ab697c@nvidia.com>
On 2026-09-20 05:41, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@nvidia.com>
>
> When P2PDMA rejects a mapping, existing warnings identify only the final
> ACS or host-bridge result. They omit topology, live controls, divergence
> ports, cache state, and intermediate routing decisions.
>
> Emit debug-level messages for verbose calculations and cache lookups.
> Report both paths, decoded ACS controls, directional decisions, host
> fallback, and the final mapping. This keeps incidental unsupported probes
> quiet while allowing the diagnostics to be enabled when needed.
>
> Tested-by: Tushar Dave <tdave@nvidia.com>
> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Looks good to me:
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
next prev parent reply other threads:[~2026-09-21 21:19 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-20 11:41 [PATCH v7 00/19] PCI/P2PDMA: Route peer-to-peer DMA by TLP class Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 01/19] PCI/P2PDMA: Document the TLP attribute assumptions Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 02/19] PCI/P2PDMA: Derive routing from directional ACS controls Leon Romanovsky
2026-09-21 20:05 ` Logan Gunthorpe
2026-09-20 11:41 ` [PATCH v7 03/19] PCI: Reject unreadable ACS controls in isolation checks Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 04/19] PCI/P2PDMA: Evaluate ACS controls at the path divergence Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 05/19] PCI/P2PDMA: Document directional ACS routing Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 06/19] PCI/P2PDMA: Collect the path's ACS controls before deciding Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 07/19] PCI/P2PDMA: Answer routing per TLP class Leon Romanovsky
2026-09-21 20:20 ` Logan Gunthorpe
2026-09-20 11:41 ` [PATCH v7 08/19] PCI/P2PDMA: Route Relaxed Ordering Completions directly Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 09/19] PCI/P2PDMA: Reject Translated Requests blocked by Translation Blocking Leon Romanovsky
2026-09-21 20:38 ` Logan Gunthorpe
2026-09-20 11:41 ` [PATCH v7 10/19] PCI/P2PDMA: Route Translated Requests under Direct Translated P2P Leon Romanovsky
2026-09-21 20:51 ` Logan Gunthorpe
2026-09-20 11:41 ` [PATCH v7 11/19] PCI/P2PDMA: Log detailed ACS routing diagnostics Leon Romanovsky
2026-09-21 21:19 ` Logan Gunthorpe [this message]
2026-09-20 11:41 ` [PATCH v7 12/19] PCI/P2PDMA: Add KUnit tests for the ACS routing decisions Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 13/19] PCI/P2PDMA: Test the ACS P2P routing walk Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 14/19] PCI: Add KUnit coverage for ACS isolation checks Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 15/19] PCI/P2PDMA: Document TLP-class routing Leon Romanovsky
2026-09-21 22:16 ` Logan Gunthorpe
2026-09-22 9:27 ` Leon Romanovsky
2026-09-22 15:43 ` Logan Gunthorpe
2026-09-20 11:41 ` [PATCH v7 16/19] dma-buf: Let importers ask how peer-to-peer traffic is routed Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 17/19] vfio/pci: Hand out the P2PDMA provider behind a dma-buf Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 18/19] RDMA/uverbs: " Leon Romanovsky
2026-09-20 11:41 ` [PATCH v7 19/19] RDMA/mlx5: Ask P2PDMA whether ATS takes a direct peer-to-peer route Leon Romanovsky
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