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SubjectRe: [GIT PULL 1/2] asm-generic: rework PCI I/O space access
On Sat, Jul 3, 2021 at 2:12 PM Arnd Bergmann <arnd@kernel.org> wrote:
> The version we got here makes it no longer crash the kernel, but
> I see your point that the runtime warning is still wrong. I'll have
> a look at what it would take to guard all inb/outb callers with a
> Kconfig conditional, and will report back after that.

I created a preliminary patch and got it to cleanly build on my randconfig box,
here is what that involved:

- added 89 Kconfig dependencies on HAS_IOPORT for PC-style devices
that are not on a PCI card.
- added 188 Kconfig dependencies on LEGACY_PCI for PCI drivers that
require port I/O. The idea is to have that control drivers for both pre-PCIe
devices and and PCIe devices that require long-deprecated features like
I/O resources, but possibly other features as well.
- The ACPI subsystem needs access to I/O ports, so that also gets a
dependency.
- CONFIG_INDIRECT_PIO requires HAS_IOPORT
- /dev/ioport needs an #ifdef around it
- several graphics drivers need workarounds instead of a 'depends on'
because they are used in virtual machines: vgaconsole, bochs, qxl,
cirrus. They work with or without port I/O
- A usb-uhci rework to split pci from non-pci support
- Minor workarounds for optional I/O port usage in libata, ipmi, tpm,
dmi-firmware, altera-stapl, parport, vga
- lots of #ifdefs in 8250
- some drivers/pci/ quirks are #ifdef'd
- drivers using ioport_map()/pci_iomap() to access ports could be
kept working when I/O ports are memory mapped

I tested the patch on a 5.13-rc4 snapshot that already has other
patches applied as a baseline for randconfig testing, so it doesn't
apply as-is.

Linus, if you like this approach, then I can work on splitting it up into
meaningful patches and submit it for a future release. I think the
CONFIG_LEGACY_PCI option has value on its own, but the others
do introduce some churn.

Full patch (120KB): https://pastebin.com/yaFSmAuY

diffstat:
drivers/accessibility/speakup/Kconfig | 1 +
drivers/acpi/Kconfig | 1 +
drivers/ata/Kconfig | 34 ++++++++++-----------
drivers/ata/ata_generic.c | 3 +-
drivers/ata/libata-sff.c | 2 ++
drivers/bus/Kconfig | 2 +-
drivers/char/Kconfig | 3 +-
drivers/char/ipmi/Makefile | 11 +++----
drivers/char/ipmi/ipmi_si_intf.c | 3 +-
drivers/char/ipmi/ipmi_si_pci.c | 3 ++
drivers/char/mem.c | 6 +++-
drivers/char/tpm/Kconfig | 1 +
drivers/char/tpm/tpm_infineon.c | 14 ++++++---
drivers/char/tpm/tpm_tis_core.c | 19 +++++-------
drivers/comedi/Kconfig | 53
+++++++++++++++++++++++++++++++++
drivers/firmware/dmi-sysfs.c | 4 +++
drivers/gpio/Kconfig | 2 +-
drivers/gpu/drm/bochs/Kconfig | 1 +
drivers/gpu/drm/bochs/bochs_hw.c | 24 ++++++++-------
drivers/gpu/drm/qxl/Kconfig | 1 +
drivers/gpu/drm/tiny/cirrus.c | 2 ++
drivers/hwmon/Kconfig | 23 +++++++++++++--
drivers/i2c/busses/Kconfig | 31 ++++++++++---------
drivers/ide/Kconfig | 1 +
drivers/iio/adc/Kconfig | 2 +-
drivers/input/gameport/Kconfig | 6 ++--
drivers/input/serio/Kconfig | 2 ++
drivers/input/touchscreen/Kconfig | 1 +
drivers/isdn/hardware/mISDN/Kconfig | 14 ++++-----
drivers/leds/Kconfig | 2 +-
drivers/media/cec/platform/Kconfig | 2 +-
drivers/media/pci/dm1105/Kconfig | 2 +-
drivers/media/radio/Kconfig | 15 +++++++++-
drivers/media/rc/Kconfig | 9 +++++-
drivers/message/fusion/Kconfig | 8 ++---
drivers/misc/altera-stapl/Makefile | 3 +-
drivers/misc/altera-stapl/altera.c | 6 +++-
drivers/net/Kconfig | 2 +-
drivers/net/arcnet/Kconfig | 2 +-
drivers/net/can/cc770/Kconfig | 1 +
drivers/net/can/sja1000/Kconfig | 1 +
drivers/net/ethernet/8390/Kconfig | 2 +-
drivers/net/ethernet/amd/Kconfig | 2 +-
drivers/net/ethernet/intel/Kconfig | 4 +--
drivers/net/ethernet/sis/Kconfig | 6 ++--
drivers/net/ethernet/ti/Kconfig | 4 +--
drivers/net/ethernet/via/Kconfig | 5 ++--
drivers/net/fddi/Kconfig | 4 +--
drivers/net/hamradio/Kconfig | 6 ++--
drivers/net/wan/Kconfig | 2 +-
drivers/net/wireless/atmel/Kconfig | 4 +--
drivers/net/wireless/intersil/hostap/Kconfig | 4 +--
drivers/parport/Kconfig | 2 +-
drivers/pci/pci-sysfs.c | 16 ++++++++++
drivers/pci/quirks.c | 2 ++
drivers/pcmcia/Kconfig | 2 +-
drivers/platform/chrome/Kconfig | 1 +
drivers/platform/chrome/wilco_ec/Kconfig | 1 +
drivers/pnp/isapnp/Kconfig | 2 +-
drivers/power/reset/Kconfig | 1 +
drivers/rtc/Kconfig | 4 ++-
drivers/scsi/Kconfig | 21 ++++++-------
drivers/scsi/aic7xxx/Kconfig.aic79xx | 2 +-
drivers/scsi/aic7xxx/Kconfig.aic7xxx | 2 +-
drivers/scsi/aic94xx/Kconfig | 2 +-
drivers/scsi/megaraid/Kconfig.megaraid | 2 +-
drivers/scsi/mvsas/Kconfig | 2 +-
drivers/scsi/qla2xxx/Kconfig | 2 +-
drivers/spi/Kconfig | 1 +
drivers/staging/kpc2000/Kconfig | 2 +-
drivers/staging/sm750fb/Kconfig | 2 +-
drivers/staging/vt6655/Kconfig | 2 +-
drivers/tty/Kconfig | 2 +-
drivers/tty/serial/8250/8250_early.c | 4 +++
drivers/tty/serial/8250/8250_pci.c | 19 ++++++++++--
drivers/tty/serial/8250/8250_port.c | 22 ++++++++++++--
drivers/tty/serial/8250/Kconfig | 1 +
drivers/tty/serial/Kconfig | 2 +-
drivers/usb/core/hcd-pci.c | 4 +--
drivers/usb/host/Kconfig | 4 +--
drivers/usb/host/pci-quirks.c | 128
+++++++++++++++++++++++++++++++++++++++++--------------------------------------
drivers/usb/host/pci-quirks.h | 33 ++++++++++++++++-----
drivers/usb/host/uhci-hcd.c | 2 +-
drivers/usb/host/uhci-hcd.h | 77
+++++++++++++++++++++++++++++++----------------
drivers/video/console/Kconfig | 4 ++-
drivers/video/fbdev/Kconfig | 24 +++++++--------
drivers/watchdog/Kconfig | 6 ++--
include/asm-generic/io.h | 6 ++++
include/linux/gameport.h | 9 ++++--
include/linux/parport.h | 2 +-
include/video/vga.h | 8 +++++
lib/Kconfig | 4 +++
lib/Kconfig.kgdb | 1 +
sound/drivers/Kconfig | 3 ++
sound/isa/Kconfig | 1 +
sound/pci/Kconfig | 44 ++++++++++++++++++++++-----
96 files changed, 575 insertions(+), 272 deletions(-)

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