From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: "Toke Høiland-Jørgensen" <toke@redhat.com>,
"Pali Rohár" <pali@kernel.org>,
vtolkm@gmail.com, linux-pci@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
"Rob Herring" <robh@kernel.org>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
"Marek Behún" <marek.behun@nic.cz>,
"Jason Cooper" <jason@lakedaemon.net>
Subject: Re: PCI trouble on mvebu (Turris Omnia)
Date: Thu, 29 Oct 2020 22:54:09 +0100 [thread overview]
Message-ID: <20201029225409.2accead3@windsurf.home> (raw)
In-Reply-To: <20201029193022.GA476048@bjorn-Precision-5520>
Hello,
On Thu, 29 Oct 2020 14:30:22 -0500
Bjorn Helgaas <helgaas@kernel.org> wrote:
> We could quirk these NICs to avoid the retrain, but since aardvark and
> mvebu have no obvious connection and WLE200/WLE900 and MT76 have no
> obvious connection, I doubt there's a simple hardware defect that
> explains all these.
aardvark and mvebu have one very strong connection: they are the only
two drivers making use of the PCI Bridge emulation logic in
drivers/pci/pci-bridge-emul.c:
drivers/pci$ git grep pci-bridge-emul
akefile:obj-$(CONFIG_PCI_BRIDGE_EMUL) += pci-bridge-emul.o
controller/pci-aardvark.c:#include "../pci-bridge-emul.h"
controller/pci-mvebu.c:#include "../pci-bridge-emul.h"
pci-bridge-emul.c:#include "pci-bridge-emul.h"
I haven't read the whole thread, but it is important to keep in mind
that on those two platforms, the PCI Bridge seen by Linux is *not* a
real HW bridge. It is faked by the the pci-bridge-emul code. So if this
code has defects/bugs in how it emulates a PCI Bridge behavior, you
might see weird things.
Best regards,
Thomas
--
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: "Rob Herring" <robh@kernel.org>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
"Jason Cooper" <jason@lakedaemon.net>,
"Pali Rohár" <pali@kernel.org>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
"Marek Behún" <marek.behun@nic.cz>,
linux-pci@vger.kernel.org, vtolkm@gmail.com,
linux-arm-kernel@lists.infradead.org
Subject: Re: PCI trouble on mvebu (Turris Omnia)
Date: Thu, 29 Oct 2020 22:54:09 +0100 [thread overview]
Message-ID: <20201029225409.2accead3@windsurf.home> (raw)
In-Reply-To: <20201029193022.GA476048@bjorn-Precision-5520>
Hello,
On Thu, 29 Oct 2020 14:30:22 -0500
Bjorn Helgaas <helgaas@kernel.org> wrote:
> We could quirk these NICs to avoid the retrain, but since aardvark and
> mvebu have no obvious connection and WLE200/WLE900 and MT76 have no
> obvious connection, I doubt there's a simple hardware defect that
> explains all these.
aardvark and mvebu have one very strong connection: they are the only
two drivers making use of the PCI Bridge emulation logic in
drivers/pci/pci-bridge-emul.c:
drivers/pci$ git grep pci-bridge-emul
akefile:obj-$(CONFIG_PCI_BRIDGE_EMUL) += pci-bridge-emul.o
controller/pci-aardvark.c:#include "../pci-bridge-emul.h"
controller/pci-mvebu.c:#include "../pci-bridge-emul.h"
pci-bridge-emul.c:#include "pci-bridge-emul.h"
I haven't read the whole thread, but it is important to keep in mind
that on those two platforms, the PCI Bridge seen by Linux is *not* a
real HW bridge. It is faked by the the pci-bridge-emul code. So if this
code has defects/bugs in how it emulates a PCI Bridge behavior, you
might see weird things.
Best regards,
Thomas
--
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-10-29 22:06 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-27 15:43 PCI trouble on mvebu (Turris Omnia) Toke Høiland-Jørgensen
2020-10-27 15:43 ` Toke Høiland-Jørgensen
2020-10-27 17:20 ` Bjorn Helgaas
2020-10-27 17:20 ` Bjorn Helgaas
2020-10-27 17:44 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-27 17:44 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-27 18:59 ` Toke Høiland-Jørgensen
2020-10-27 18:59 ` Toke Høiland-Jørgensen
2020-10-27 20:20 ` Toke Høiland-Jørgensen
2020-10-27 20:20 ` Toke Høiland-Jørgensen
2020-10-27 21:22 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-27 21:22 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-27 21:31 ` Toke Høiland-Jørgensen
2020-10-27 21:31 ` Toke Høiland-Jørgensen
2020-10-27 22:01 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-27 22:01 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-27 22:12 ` Toke Høiland-Jørgensen
2020-10-27 22:12 ` Toke Høiland-Jørgensen
2020-10-27 18:56 ` Toke Høiland-Jørgensen
2020-10-27 18:56 ` Toke Høiland-Jørgensen
2020-10-28 13:36 ` Toke Høiland-Jørgensen
2020-10-28 13:36 ` Toke Høiland-Jørgensen
2020-10-28 14:42 ` Bjorn Helgaas
2020-10-28 14:42 ` Bjorn Helgaas
2020-10-28 15:08 ` Toke Høiland-Jørgensen
2020-10-28 15:08 ` Toke Høiland-Jørgensen
2020-10-28 16:40 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-28 16:40 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-28 23:16 ` Bjorn Helgaas
2020-10-28 23:16 ` Bjorn Helgaas
2020-10-29 10:09 ` Pali Rohár
2020-10-29 10:09 ` Pali Rohár
2020-10-29 10:56 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-29 10:56 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-29 11:12 ` Toke Høiland-Jørgensen
2020-10-29 11:12 ` Toke Høiland-Jørgensen
2020-10-29 19:30 ` Bjorn Helgaas
2020-10-29 19:30 ` Bjorn Helgaas
2020-10-29 19:56 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-29 19:56 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-29 19:57 ` Andrew Lunn
2020-10-29 19:57 ` Andrew Lunn
2020-10-29 21:55 ` Thomas Petazzoni
2020-10-29 21:55 ` Thomas Petazzoni
2020-10-29 20:18 ` Toke Høiland-Jørgensen
2020-10-29 20:18 ` Toke Høiland-Jørgensen
2020-10-29 22:09 ` Toke Høiland-Jørgensen
2020-10-29 22:09 ` Toke Høiland-Jørgensen
2020-10-29 20:58 ` Marek Behun
2020-10-29 20:58 ` Marek Behun
2020-10-30 10:08 ` Pali Rohár
2020-10-30 10:08 ` Pali Rohár
2020-10-30 10:45 ` Marek Behun
2020-10-30 10:45 ` Marek Behun
2020-10-29 21:54 ` Thomas Petazzoni [this message]
2020-10-29 21:54 ` Thomas Petazzoni
2020-10-29 23:15 ` Toke Høiland-Jørgensen
2020-10-29 23:15 ` Toke Høiland-Jørgensen
2020-10-30 8:23 ` Thomas Petazzoni
2020-10-30 8:23 ` Thomas Petazzoni
2020-10-30 10:15 ` Pali Rohár
2020-10-30 10:15 ` Pali Rohár
2020-10-29 10:41 ` Toke Høiland-Jørgensen
2020-10-29 10:41 ` Toke Høiland-Jørgensen
2020-10-29 11:18 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-29 11:18 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-30 11:23 ` Pali Rohár
2020-10-30 11:23 ` Pali Rohár
2020-10-30 13:02 ` Toke Høiland-Jørgensen
2020-10-30 13:02 ` Toke Høiland-Jørgensen
2020-10-30 14:23 ` Pali Rohár
2020-10-30 14:23 ` Pali Rohár
2020-10-30 14:54 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-30 14:54 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-31 12:49 ` Toke Høiland-Jørgensen
2020-10-31 12:49 ` Toke Høiland-Jørgensen
2020-11-02 15:24 ` Pali Rohár
2020-11-02 15:24 ` Pali Rohár
2020-11-02 15:54 ` Toke Høiland-Jørgensen
2020-11-02 15:54 ` Toke Høiland-Jørgensen
2020-11-02 16:18 ` ™֟☻̭҇ Ѽ ҉ ®
2020-11-02 16:18 ` ™֟☻̭҇ Ѽ ҉ ®
2020-11-02 16:33 ` Toke Høiland-Jørgensen
2020-11-02 16:33 ` Toke Høiland-Jørgensen
2021-03-15 19:58 ` Pali Rohár
2021-03-15 19:58 ` Pali Rohár
2021-03-16 9:25 ` Pali Rohár
2021-03-16 9:25 ` Pali Rohár
2021-03-18 22:43 ` Toke Høiland-Jørgensen
2021-03-18 22:43 ` Toke Høiland-Jørgensen
2021-03-18 23:16 ` Pali Rohár
2021-03-18 23:16 ` Pali Rohár
2021-03-26 12:50 ` Pali Rohár
2021-03-26 12:50 ` Pali Rohár
2021-03-26 15:25 ` Toke Høiland-Jørgensen
2021-03-26 15:25 ` Toke Høiland-Jørgensen
2021-03-26 15:34 ` Pali Rohár
2021-03-26 15:34 ` Pali Rohár
2021-03-26 16:54 ` Toke Høiland-Jørgensen
2021-03-26 16:54 ` Toke Høiland-Jørgensen
2021-03-26 17:11 ` Pali Rohár
2021-03-26 17:11 ` Pali Rohár
2021-03-26 17:51 ` Toke Høiland-Jørgensen
2021-03-26 17:51 ` Toke Høiland-Jørgensen
2021-03-29 17:09 ` Pali Rohár
2021-03-29 17:09 ` Pali Rohár
2021-03-31 14:02 ` Toke Høiland-Jørgensen
2021-03-31 14:02 ` Toke Høiland-Jørgensen
2021-03-31 16:15 ` Pali Rohár
2021-03-31 16:15 ` Pali Rohár
2021-03-31 16:53 ` Toke Høiland-Jørgensen
2021-03-31 16:53 ` Toke Høiland-Jørgensen
2020-10-29 1:21 ` Marek Behun
2020-10-29 1:21 ` Marek Behun
2020-10-29 15:12 ` Rob Herring
2020-10-29 15:12 ` Rob Herring
2020-10-27 18:03 ` Marek Behun
2020-10-27 18:03 ` Marek Behun
2020-10-27 19:00 ` Toke Høiland-Jørgensen
2020-10-27 19:00 ` Toke Høiland-Jørgensen
2020-10-27 20:19 ` Marek Behun
2020-10-27 20:19 ` Marek Behun
2020-10-27 20:49 ` Toke Høiland-Jørgensen
2020-10-27 20:49 ` Toke Høiland-Jørgensen
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