From: Borislav Petkov <bp@alien8.de>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Saheed Bolarinwa <refactormyself@gmail.com>,
trix@redhat.com, Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Wolfgang Grandegger <wg@grandegger.com>,
Marc Kleine-Budde <mkl@pengutronix.de>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
Joerg Roedel <joro@8bytes.org>,
bjorn@helgaas.com, skhan@linuxfoundation.org,
linux-kernel-mentees@lists.linuxfoundation.org,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-mtd@lists.infradead.org, iommu@lists.linux-foundation.org,
linux-rdma@vger.kernel.org, linux-ide@vger.kernel.org,
linux-i2c@vger.kernel.org, linux-hwmon@vger.kernel.org,
dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
linux-gpio@vger.kernel.org, linux-fpga@vger.kernel.org,
linux-edac@vger.kernel.org, dmaengine@vger.kernel.org,
linux-crypto@vger.kernel.org,
linux-atm-general@lists.sourceforge.net
Subject: Re: [RFC PATCH 00/17] Drop uses of pci_read_config_*() return value
Date: Sun, 2 Aug 2020 22:18:06 +0200 [thread overview]
Message-ID: <20200802201806.GA24437@nazgul.tnic> (raw)
In-Reply-To: <20200802191406.GA248232@bjorn-Precision-5520>
On Sun, Aug 02, 2020 at 02:14:06PM -0500, Bjorn Helgaas wrote:
> Wait, I'm not convinced yet. I know that if a PCI read fails, you
> normally get ~0 data because the host bridge fabricates it to complete
> the CPU load.
>
> But what guarantees that a PCI config register cannot contain ~0?
Well, I don't think you can differentiate that case, right?
I guess this is where the driver knowledge comes into play: if the read
returns ~0, the pci_read_config* should probably return in that case
something like:
PCIBIOS_READ_MAYBE_FAILED
to denote it is all 1s and then the caller should be able to determine,
based on any of domain:bus:slot.func and whatever else the driver knows
about its hardware, whether the 1s are a valid value or an error.
Hopefully.
Or something better of which I cannot think of right now...
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2020-08-02 20:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-01 11:24 [RFC PATCH 00/17] Drop uses of pci_read_config_*() return value Saheed O. Bolarinwa
2020-08-01 11:24 ` [RFC PATCH 12/17] i2c: " Saheed O. Bolarinwa
2020-08-01 12:56 ` [RFC PATCH 00/17] " Borislav Petkov
2020-08-02 14:53 ` Tom Rix
2020-08-02 17:28 ` Saheed Bolarinwa
2020-08-02 18:46 ` Borislav Petkov
2020-08-02 19:14 ` Bjorn Helgaas
2020-08-02 20:18 ` Borislav Petkov [this message]
2020-08-03 6:56 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200802201806.GA24437@nazgul.tnic \
--to=bp@alien8.de \
--cc=bjorn@helgaas.com \
--cc=davem@davemloft.net \
--cc=dmaengine@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=helgaas@kernel.org \
--cc=intel-gfx@lists.freedesktop.org \
--cc=iommu@lists.linux-foundation.org \
--cc=joro@8bytes.org \
--cc=kuba@kernel.org \
--cc=kvalo@codeaurora.org \
--cc=linux-atm-general@lists.sourceforge.net \
--cc=linux-crypto@vger.kernel.org \
--cc=linux-edac@vger.kernel.org \
--cc=linux-fpga@vger.kernel.org \
--cc=linux-gpio@vger.kernel.org \
--cc=linux-hwmon@vger.kernel.org \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel-mentees@lists.linuxfoundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mtd@lists.infradead.org \
--cc=linux-pci@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=linux-wireless@vger.kernel.org \
--cc=miquel.raynal@bootlin.com \
--cc=mkl@pengutronix.de \
--cc=netdev@vger.kernel.org \
--cc=refactormyself@gmail.com \
--cc=richard@nod.at \
--cc=skhan@linuxfoundation.org \
--cc=trix@redhat.com \
--cc=vigneshr@ti.com \
--cc=wg@grandegger.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).