From: Bjorn Helgaas <helgaas@kernel•org>
To: John Garry <john.garry@huawei•com>
Cc: Niklas Schnelle <schnelle@linux•ibm.com>,
Mauro Carvalho Chehab <mchehab@kernel•org>,
Arnd Bergmann <arnd@arndb•de>,
Hans Verkuil <hverkuil-cisco@xs4all•nl>,
Ettore Chimenti <ek5.chimenti@gmail•com>,
Greg Kroah-Hartman <gregkh@linuxfoundation•org>,
Arnd Bergmann <arnd@kernel•org>,
Bjorn Helgaas <bhelgaas@google•com>,
Nick Hu <nickhu@andestech•com>, Greentime Hu <green.hu@gmail•com>,
Vincent Chen <deanbo422@gmail•com>,
Paul Walmsley <paul.walmsley@sifive•com>,
Palmer Dabbelt <palmer@dabbelt•com>,
Albert Ou <aou@eecs•berkeley.edu>, Guo Ren <guoren@kernel•org>,
Damien Le Moal <damien.lemoal@opensource•wdc.com>,
Ian Abbott <abbotti@mev•co.uk>,
H Hartley Sweeten <hsweeten@visionengravers•com>,
Linus Walleij <linus.walleij@linaro•org>,
Bartosz Golaszewski <brgl@bgdev•pl>,
Jean Delvare <jdelvare@suse•com>,
Guenter Roeck <linux@roeck-us•net>,
Dmitry Torokhov <dmitry.torokhov@gmail•com>,
Karsten Keil <isdn@linux-pingi•de>,
Sathya Prakash <sathya.prakash@broadcom•com>,
Sreekanth Reddy <sreekanth.reddy@broadcom•com>,
Suganath Prabu Subramani <suganath-prabu.subramani@broadcom•com>,
Michael Grzeschik <m.grzeschik@pengutronix•de>,
"David S. Miller" <davem@davemloft•net>,
Jakub Kicinski <kuba@kernel•org>,
Jesse Brandeburg <jesse.brandeburg@intel•com>,
Tony Nguyen <anthony.l.nguyen@intel•com>,
Kalle Valo <kvalo@kernel•org>, Jouni Malinen <j@w1•fi>,
"James E.J. Bottomley" <jejb@linux•ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle•com>,
Hannes Reinecke <hare@suse•com>,
Kashyap Desai <kashyap.desai@broadcom•com>,
Sumit Saxena <sumit.saxena@broadcom•com>,
Shivasharan S <shivasharan.srikanteshwara@broadcom•com>,
Nilesh Javali <njavali@marvell•com>,
GR-QLogic-Storage-Upstream@marvell•com,
Mark Brown <broonie@kernel•org>,
Sudip Mukherjee <sudipm.mukherjee@gmail•com>,
Teddy Wang <teddy.wang@siliconmotion•com>,
Forest Bond <forest@alittletooquiet•net>,
Jiri Slaby <jirislaby@kernel•org>,
Wim Van Sebroeck <wim@linux-watchdog•org>,
Jaroslav Kysela <perex@perex•cz>, Takashi Iwai <tiwai@suse•com>,
linux-kernel@vger•kernel.org, linux-arch@vger•kernel.org,
linux-pci@vger•kernel.org, linux-riscv@lists•infradead.org,
linux-csky@vger•kernel.org, linux-ide@vger•kernel.org,
linux-gpio@vger•kernel.org, linux-hwmon@vger•kernel.org,
linux-i2c@vger•kernel.org, linux-input@vger•kernel.org,
netdev@vger•kernel.org, linux-media@vger•kernel.org,
MPT-FusionLinux.pdl@broadcom•com, linux-scsi@vger•kernel.org,
intel-wired-lan@lists•osuosl.org, linux-wireless@vger•kernel.org,
megaraidlinux.pdl@broadcom•com, linux-spi@vger•kernel.org,
linux-fbdev@vger•kernel.org, linux-serial@vger•kernel.org,
dri-devel@lists•freedesktop.org, linux-watchdog@vger•kernel.org
Subject: Re: [RFC 01/32] Kconfig: introduce and depend on LEGACY_PCI
Date: Thu, 6 Jan 2022 12:14:09 -0600 [thread overview]
Message-ID: <20220106181409.GA297735@bhelgaas> (raw)
In-Reply-To: <74bf4fde-3972-1c36-ca04-58089da0d82b@huawei.com>
On Thu, Jan 06, 2022 at 05:41:00PM +0000, John Garry wrote:
> On 05/01/2022 19:47, Bjorn Helgaas wrote:
> > IMO inb() should
> > be present but do something innocuous like return ~0, as it would if
> > I/O port space is supported but there's no device at that address.
> >
> > [1]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/scsi/megaraid.c?id=v5.15#n4210
> >
>
> That driver would prob not be used on systems which does not support PIO,
> and so could have a HAS_IOPORT dependency. But it is not strictly necessary.
I don't want the path of "this driver isn't needed because the device
is unlikely to be used on this arch."
Maybe it's not _always_ possible, but if the device can be plugged
into the platform, I think we should be able to build the driver for
it.
If the device requires I/O port space and the platform doesn't support
it, the PCI core or the driver should detect that and give a useful
diagnostic.
Bjorn
next prev parent reply other threads:[~2022-01-06 18:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20211227164317.4146918-1-schnelle@linux.ibm.com>
2021-12-27 16:42 ` [RFC 01/32] Kconfig: introduce and depend on LEGACY_PCI Niklas Schnelle
2021-12-27 17:48 ` Guenter Roeck
2021-12-28 2:09 ` Mauro Carvalho Chehab
2021-12-28 8:21 ` Greg Kroah-Hartman
2021-12-28 9:15 ` Mauro Carvalho Chehab
2021-12-28 10:58 ` Niklas Schnelle
2021-12-28 12:01 ` Greg Kroah-Hartman
2021-12-28 12:54 ` Mauro Carvalho Chehab
2021-12-28 15:06 ` Niklas Schnelle
2021-12-28 17:12 ` Mauro Carvalho Chehab
2021-12-29 11:45 ` Niklas Schnelle
2021-12-29 12:12 ` Mauro Carvalho Chehab
2021-12-29 16:03 ` Bjorn Helgaas
2021-12-29 16:55 ` Niklas Schnelle
2022-01-05 17:42 ` John Garry
2022-01-05 19:47 ` Bjorn Helgaas
2022-01-06 17:41 ` John Garry
2022-01-06 18:14 ` Bjorn Helgaas [this message]
2022-01-07 17:16 ` John Garry
2022-01-10 9:34 ` Niklas Schnelle
2021-12-27 16:43 ` [RFC 17/32] net: Kconfig: add HAS_IOPORT dependencies Niklas Schnelle
2021-12-27 17:28 ` Marc Kleine-Budde
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=20220106181409.GA297735@bhelgaas \
--to=helgaas@kernel$(echo .)org \
--cc=GR-QLogic-Storage-Upstream@marvell$(echo .)com \
--cc=MPT-FusionLinux.pdl@broadcom$(echo .)com \
--cc=abbotti@mev$(echo .)co.uk \
--cc=anthony.l.nguyen@intel$(echo .)com \
--cc=aou@eecs$(echo .)berkeley.edu \
--cc=arnd@arndb$(echo .)de \
--cc=arnd@kernel$(echo .)org \
--cc=bhelgaas@google$(echo .)com \
--cc=brgl@bgdev$(echo .)pl \
--cc=broonie@kernel$(echo .)org \
--cc=damien.lemoal@opensource$(echo .)wdc.com \
--cc=davem@davemloft$(echo .)net \
--cc=deanbo422@gmail$(echo .)com \
--cc=dmitry.torokhov@gmail$(echo .)com \
--cc=dri-devel@lists$(echo .)freedesktop.org \
--cc=ek5.chimenti@gmail$(echo .)com \
--cc=forest@alittletooquiet$(echo .)net \
--cc=green.hu@gmail$(echo .)com \
--cc=gregkh@linuxfoundation$(echo .)org \
--cc=guoren@kernel$(echo .)org \
--cc=hare@suse$(echo .)com \
--cc=hsweeten@visionengravers$(echo .)com \
--cc=hverkuil-cisco@xs4all$(echo .)nl \
--cc=intel-wired-lan@lists$(echo .)osuosl.org \
--cc=isdn@linux-pingi$(echo .)de \
--cc=j@w1$(echo .)fi \
--cc=jdelvare@suse$(echo .)com \
--cc=jejb@linux$(echo .)ibm.com \
--cc=jesse.brandeburg@intel$(echo .)com \
--cc=jirislaby@kernel$(echo .)org \
--cc=john.garry@huawei$(echo .)com \
--cc=kashyap.desai@broadcom$(echo .)com \
--cc=kuba@kernel$(echo .)org \
--cc=kvalo@kernel$(echo .)org \
--cc=linus.walleij@linaro$(echo .)org \
--cc=linux-arch@vger$(echo .)kernel.org \
--cc=linux-csky@vger$(echo .)kernel.org \
--cc=linux-fbdev@vger$(echo .)kernel.org \
--cc=linux-gpio@vger$(echo .)kernel.org \
--cc=linux-hwmon@vger$(echo .)kernel.org \
--cc=linux-i2c@vger$(echo .)kernel.org \
--cc=linux-ide@vger$(echo .)kernel.org \
--cc=linux-input@vger$(echo .)kernel.org \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=linux-media@vger$(echo .)kernel.org \
--cc=linux-pci@vger$(echo .)kernel.org \
--cc=linux-riscv@lists$(echo .)infradead.org \
--cc=linux-scsi@vger$(echo .)kernel.org \
--cc=linux-serial@vger$(echo .)kernel.org \
--cc=linux-spi@vger$(echo .)kernel.org \
--cc=linux-watchdog@vger$(echo .)kernel.org \
--cc=linux-wireless@vger$(echo .)kernel.org \
--cc=linux@roeck-us$(echo .)net \
--cc=m.grzeschik@pengutronix$(echo .)de \
--cc=martin.petersen@oracle$(echo .)com \
--cc=mchehab@kernel$(echo .)org \
--cc=megaraidlinux.pdl@broadcom$(echo .)com \
--cc=netdev@vger$(echo .)kernel.org \
--cc=nickhu@andestech$(echo .)com \
--cc=njavali@marvell$(echo .)com \
--cc=palmer@dabbelt$(echo .)com \
--cc=paul.walmsley@sifive$(echo .)com \
--cc=perex@perex$(echo .)cz \
--cc=sathya.prakash@broadcom$(echo .)com \
--cc=schnelle@linux$(echo .)ibm.com \
--cc=shivasharan.srikanteshwara@broadcom$(echo .)com \
--cc=sreekanth.reddy@broadcom$(echo .)com \
--cc=sudipm.mukherjee@gmail$(echo .)com \
--cc=suganath-prabu.subramani@broadcom$(echo .)com \
--cc=sumit.saxena@broadcom$(echo .)com \
--cc=teddy.wang@siliconmotion$(echo .)com \
--cc=tiwai@suse$(echo .)com \
--cc=wim@linux-watchdog$(echo .)org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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