The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 193ced4a79599352d63cb8c9e2f0c6043106eb6a Mon Sep 17 00:00:00 2001
From: "Maciej W. Rozycki" macro@orcam.me.uk Date: Wed, 10 Mar 2021 13:03:14 +0100 Subject: [PATCH] FDDI: defxx: Make MMIO the configuration default except for EISA
Recent versions of the PCI Express specification have deprecated support for I/O transactions and actually some PCIe host bridges, such as Power Systems Host Bridge 4 (PHB4), do not implement them.
The default kernel configuration choice for the defxx driver is the use of I/O ports rather than MMIO for PCI and EISA systems. It may have made sense as a conservative backwards compatible choice back when MMIO operation support was added to the driver as a part of TURBOchannel bus support. However nowadays this configuration choice makes the driver unusable with systems that do not implement I/O transactions for PCIe.
Make DEFXX_MMIO the configuration default then, except where configured for EISA. This exception is because an EISA adapter can have its MMIO decoding disabled with ECU (EISA Configuration Utility) and therefore not available with the resource allocation infrastructure we implement, while port I/O is always readily available as it uses slot-specific addressing, directly mapped to the slot an option card has been placed in and handled with our EISA bus support core. Conversely a kernel that supports modern systems which may not have I/O transactions implemented for PCIe will usually not be expected to handle legacy EISA systems.
The change of the default will make it easier for people, including but not limited to distribution packagers, to make a working choice for the driver.
Update the option description accordingly and while at it replace the potentially ambiguous PIO acronym with IOP for "port I/O" vs "I/O ports" according to our nomenclature used elsewhere.
Signed-off-by: Maciej W. Rozycki macro@orcam.me.uk Fixes: e89a2cfb7d7b ("[TC] defxx: TURBOchannel support") Cc: stable@vger.kernel.org # v2.6.21+ Signed-off-by: David S. Miller davem@davemloft.net
diff --git a/drivers/net/fddi/Kconfig b/drivers/net/fddi/Kconfig index f722079dfb6a..f99c1048c97e 100644 --- a/drivers/net/fddi/Kconfig +++ b/drivers/net/fddi/Kconfig @@ -40,17 +40,20 @@ config DEFXX
config DEFXX_MMIO bool - prompt "Use MMIO instead of PIO" if PCI || EISA + prompt "Use MMIO instead of IOP" if PCI || EISA depends on DEFXX - default n if PCI || EISA + default n if EISA default y help This instructs the driver to use EISA or PCI memory-mapped I/O - (MMIO) as appropriate instead of programmed I/O ports (PIO). + (MMIO) as appropriate instead of programmed I/O ports (IOP). Enabling this gives an improvement in processing time in parts - of the driver, but it may cause problems with EISA (DEFEA) - adapters. TURBOchannel does not have the concept of I/O ports, - so MMIO is always used for these (DEFTA) adapters. + of the driver, but it requires a memory window to be configured + for EISA (DEFEA) adapters that may not always be available. + Conversely some PCIe host bridges do not support IOP, so MMIO + may be required to access PCI (DEFPA) adapters on downstream PCI + buses with some systems. TURBOchannel does not have the concept + of I/O ports, so MMIO is always used for these (DEFTA) adapters.
If unsure, say N.