Commit fcbfe812 authored by Niklas Schnelle's avatar Niklas Schnelle Committed by Arnd Bergmann

Kconfig: introduce HAS_IOPORT option and select it as necessary

We introduce a new HAS_IOPORT Kconfig option to indicate support for I/O
Port access. In a future patch HAS_IOPORT=n will disable compilation of
the I/O accessor functions inb()/outb() and friends on architectures
which can not meaningfully support legacy I/O spaces such as s390.

The following architectures do not select HAS_IOPORT:

* ARC
* C-SKY
* Hexagon
* Nios II
* OpenRISC
* s390
* User-Mode Linux
* Xtensa

All other architectures select HAS_IOPORT at least conditionally.

The "depends on" relations on HAS_IOPORT in drivers as well as ifdefs
for HAS_IOPORT specific sections will be added in subsequent patches on
a per subsystem basis.
Co-developed-by: default avatarArnd Bergmann <arnd@kernel.org>
Signed-off-by: default avatarArnd Bergmann <arnd@kernel.org>
Acked-by: Johannes Berg <johannes@sipsolutions.net> # for ARCH=um
Acked-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent fe15c26e
......@@ -27,6 +27,7 @@ config ALPHA
select AUDIT_ARCH
select GENERIC_CPU_VULNERABILITIES
select GENERIC_SMP_IDLE_THREAD
select HAS_IOPORT
select HAVE_ARCH_AUDITSYSCALL
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
......
......@@ -70,6 +70,7 @@ config ARM
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select HARDIRQS_SW_RESEND
select HAS_IOPORT
select HAVE_ARCH_AUDITSYSCALL if AEABI && !OABI_COMPAT
select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
......
......@@ -145,6 +145,7 @@ config ARM64
select GENERIC_GETTIMEOFDAY
select GENERIC_VDSO_TIME_NS
select HARDIRQS_SW_RESEND
select HAS_IOPORT
select HAVE_MOVE_PMD
select HAVE_MOVE_PUD
select HAVE_PCI
......
......@@ -25,6 +25,7 @@ config IA64
select PCI_DOMAINS if PCI
select PCI_MSI
select PCI_SYSCALL if PCI
select HAS_IOPORT
select HAVE_ASM_MODVERSIONS
select HAVE_UNSTABLE_SCHED_CLOCK
select HAVE_EXIT_THREAD
......
......@@ -80,6 +80,7 @@ config LOONGARCH
select GENERIC_SMP_IDLE_THREAD
select GENERIC_TIME_VSYSCALL
select GPIOLIB
select HAS_IOPORT
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_MMAP_RND_BITS if MMU
select HAVE_ARCH_SECCOMP_FILTER
......
......@@ -18,6 +18,7 @@ config M68K
select GENERIC_CPU_DEVICES
select GENERIC_IOMAP
select GENERIC_IRQ_SHOW
select HAS_IOPORT if PCI || ISA || ATARI_ROM_ISA
select HAVE_ARCH_SECCOMP
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ASM_MODVERSIONS
......
......@@ -21,6 +21,7 @@ config MICROBLAZE
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP
select GENERIC_SCHED_CLOCK
select HAS_IOPORT if PCI
select HAVE_ARCH_HASH
select HAVE_ARCH_KGDB
select HAVE_ARCH_SECCOMP
......
......@@ -47,6 +47,7 @@ config MIPS
select GENERIC_SMP_IDLE_THREAD
select GENERIC_TIME_VSYSCALL
select GUP_GET_PXX_LOW_HIGH if CPU_MIPS32 && PHYS_ADDR_T_64BIT
select HAS_IOPORT if !NO_IOPORT_MAP || ISA
select HAVE_ARCH_COMPILER_H
select HAVE_ARCH_JUMP_LABEL
select HAVE_ARCH_KGDB if MIPS_FP_SUPPORT
......
......@@ -47,6 +47,7 @@ config PARISC
select MODULES_USE_ELF_RELA
select CLONE_BACKWARDS
select TTY # Needed for pdc_cons.c
select HAS_IOPORT if PCI || EISA
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_HASH
......
......@@ -188,6 +188,7 @@ config PPC
select GENERIC_SMP_IDLE_THREAD
select GENERIC_TIME_VSYSCALL
select GENERIC_VDSO_TIME_NS
select HAS_IOPORT if PCI
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
......
......@@ -74,6 +74,7 @@ config RISCV
select GENERIC_TIME_VSYSCALL if MMU && 64BIT
select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO
select HARDIRQS_SW_RESEND
select HAS_IOPORT if MMU
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
select HAVE_ARCH_HUGE_VMAP if MMU && 64BIT && !XIP_KERNEL
......
......@@ -25,6 +25,7 @@ config SUPERH
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select GUP_GET_PXX_LOW_HIGH if X2TLB
select HAS_IOPORT if HAS_IOPORT_MAP
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_KGDB
select HAVE_ARCH_SECCOMP_FILTER
......
......@@ -32,6 +32,7 @@ config SPARC
select GENERIC_IRQ_SHOW
select ARCH_WANT_IPC_PARSE_VERSION
select GENERIC_PCI_IOMAP
select HAS_IOPORT
select HAVE_NMI_WATCHDOG if SPARC64
select HAVE_CBPF_JIT if SPARC32
select HAVE_EBPF_JIT if SPARC64
......
......@@ -162,6 +162,7 @@ config X86
select GUP_GET_PXX_LOW_HIGH if X86_PAE
select HARDIRQS_SW_RESEND
select HARDLOCKUP_CHECK_TIMESTAMP if X86_64
select HAS_IOPORT
select HAVE_ACPI_APEI if ACPI
select HAVE_ACPI_APEI_NMI if ACPI
select HAVE_ALIGNED_STRUCT_PAGE if SLUB
......
......@@ -81,7 +81,7 @@ config MOXTET
config HISILICON_LPC
bool "Support for ISA I/O space on HiSilicon Hip06/7"
depends on (ARM64 && ARCH_HISI) || (COMPILE_TEST && !ALPHA && !HEXAGON && !PARISC)
depends on HAS_IOMEM
depends on HAS_IOPORT
select INDIRECT_PIO if ARM64
help
Driver to enable I/O access to devices attached to the Low Pin
......
......@@ -4,6 +4,7 @@ menu "Bus options (PCI, PCMCIA, EISA, GSC, ISA)"
config GSC
bool "VSC/GSC/HSC bus support"
select HAVE_EISA
select HAS_IOPORT
default y
help
The VSC, GSC and HSC busses were used from the earliest 700-series
......
......@@ -92,6 +92,7 @@ config ARCH_USE_SYM_ANNOTATIONS
config INDIRECT_PIO
bool "Access I/O in non-MMIO mode"
depends on ARM64
depends on HAS_IOPORT
help
On some platforms where no separate I/O space exists, there are I/O
hosts which can not be accessed in MMIO mode. Using the logical PIO
......@@ -509,6 +510,9 @@ config HAS_IOMEM
depends on !NO_IOMEM
default y
config HAS_IOPORT
bool
config HAS_IOPORT_MAP
bool
depends on HAS_IOMEM && !NO_IOPORT_MAP
......
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