Bug#1015871: Enabling PCI_P2PDMA for distro kernels?

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From	Simon Richter <sjr@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1015871: Enabling PCI_P2PDMA for distro kernels?
Date	Thu, 26 Oct 2023 01:50:01 +0200
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X-Original-Cc	Uwe Kleine-König <u.kleine-koenig@pengutronix.de>, Bjorn Helgaas <bhelgaas@google.com>, Simon Richter <sjr@debian.org>, 1015871@bugs.debian.org, linux-pci@vger.kernel.org, Alex Deucher <alexander.deucher@amd.com>, Krzysztof Wilczy??ski <kw@linux.com>, Emanuele Rocca <ema@debian.org>
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Cross-posted to 2 groups.

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Hi,

On 10/26/23 02:11, Lukas Wunner wrote:

> This has recently been brought up internally at Intel and nobody could
> understand why there's a whitelist in the first place.  A long-time PCI
> architect told me that Intel silicon validation has been testing P2PDMA
> at least since the Lindenhurst days, i.e. since 2005.

My PCIe test box generates URE completions in the root complex when I 
try to address iGPU BARs from an FPGA, and texture fetches from the iGPU 
that use BAR addresses on the FPGA do not get forwarded (so I venture 
that is an URE as well).

CPU:  i3-3225 CPU @ 3.30GHz (fam: 06, model: 3a, stepping: 09)

pci 0000:00:00.0: [8086:0150] type 00 class 0x060000
pci 0000:00:01.0: [8086:0151] type 01 class 0x060400
pci 0000:00:02.0: [8086:0162] type 00 class 0x030000
pci 0000:00:14.0: [8086:1e31] type 00 class 0x0c0330
pci 0000:00:16.0: [8086:1e3a] type 00 class 0x078000
pci 0000:00:1a.0: [8086:1e2d] type 00 class 0x0c0320
pci 0000:00:1b.0: [8086:1e20] type 00 class 0x040300
pci 0000:00:1c.0: [8086:1e10] type 01 class 0x060400
pci 0000:00:1c.4: [8086:1e18] type 01 class 0x060400
pci 0000:00:1d.0: [8086:1e26] type 00 class 0x0c0320
pci 0000:00:1f.0: [8086:1e4a] type 00 class 0x060100
pci 0000:00:1f.2: [8086:1e00] type 00 class 0x01018f
pci 0000:00:1f.3: [8086:1e22] type 00 class 0x0c0500
pci 0000:00:1f.5: [8086:1e08] type 00 class 0x010185
pci 0000:01:00.0: [1172:1337] type 00 class 0xff0000
pci 0000:03:00.0: [10ec:8168] type 00 class 0x020000

So there is at least one configuration that doesn't work. :P

    Simon

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Thread

Bug#1015871: Enabling PCI_P2PDMA for distro kernels? Uwe Kleine-König <u.kleine-koenig@pengutronix.de> - 2023-10-25 08:30 +0200
  Bug#1015871: Enabling PCI_P2PDMA for distro kernels? Logan Gunthorpe <logang@deltatee.com> - 2023-10-25 19:00 +0200
    Bug#1015871: Enabling PCI_P2PDMA for distro kernels? Lukas Wunner <lukas@wunner.de> - 2023-10-25 19:30 +0200
      Bug#1015871: Enabling PCI_P2PDMA for distro kernels? Bjorn Helgaas <helgaas@kernel.org> - 2023-10-25 19:40 +0200
        Bug#1015871: Enabling PCI_P2PDMA for distro kernels? Logan Gunthorpe <logang@deltatee.com> - 2023-10-25 20:10 +0200
      Bug#1015871: Enabling PCI_P2PDMA for distro kernels? Simon Richter <sjr@debian.org> - 2023-10-26 01:50 +0200

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