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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: Arnd Bergmann <arnd@kernel.org> Signed-off-by: Arnd Bergmann <arnd@kernel.org> Acked-by: Johannes Berg <johannes@sipsolutions.net> # for ARCH=um Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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17 changed files with 20 additions and 1 deletions
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@ -27,6 +27,7 @@ config ALPHA
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select AUDIT_ARCH
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select GENERIC_CPU_VULNERABILITIES
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select GENERIC_SMP_IDLE_THREAD
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select HAS_IOPORT
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_MOD_ARCH_SPECIFIC
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select MODULES_USE_ELF_RELA
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@ -70,6 +70,7 @@ config ARM
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select GENERIC_SCHED_CLOCK
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select GENERIC_SMP_IDLE_THREAD
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select HARDIRQS_SW_RESEND
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select HAS_IOPORT
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select HAVE_ARCH_AUDITSYSCALL if AEABI && !OABI_COMPAT
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select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
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select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
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@ -145,6 +145,7 @@ config ARM64
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select GENERIC_GETTIMEOFDAY
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select GENERIC_VDSO_TIME_NS
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select HARDIRQS_SW_RESEND
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select HAS_IOPORT
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select HAVE_MOVE_PMD
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select HAVE_MOVE_PUD
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select HAVE_PCI
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@ -25,6 +25,7 @@ config IA64
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select PCI_DOMAINS if PCI
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select PCI_MSI
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select PCI_SYSCALL if PCI
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select HAS_IOPORT
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select HAVE_ASM_MODVERSIONS
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select HAVE_UNSTABLE_SCHED_CLOCK
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select HAVE_EXIT_THREAD
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@ -80,6 +80,7 @@ config LOONGARCH
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select GENERIC_SMP_IDLE_THREAD
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select GENERIC_TIME_VSYSCALL
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select GPIOLIB
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select HAS_IOPORT
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_ARCH_MMAP_RND_BITS if MMU
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select HAVE_ARCH_SECCOMP_FILTER
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@ -18,6 +18,7 @@ config M68K
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select GENERIC_CPU_DEVICES
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select GENERIC_IOMAP
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select GENERIC_IRQ_SHOW
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select HAS_IOPORT if PCI || ISA || ATARI_ROM_ISA
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select HAVE_ARCH_SECCOMP
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select HAVE_ARCH_SECCOMP_FILTER
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select HAVE_ASM_MODVERSIONS
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@ -21,6 +21,7 @@ config MICROBLAZE
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select GENERIC_IRQ_SHOW
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select GENERIC_PCI_IOMAP
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select GENERIC_SCHED_CLOCK
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select HAS_IOPORT if PCI
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select HAVE_ARCH_HASH
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select HAVE_ARCH_KGDB
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select HAVE_ARCH_SECCOMP
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@ -47,6 +47,7 @@ config MIPS
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select GENERIC_SMP_IDLE_THREAD
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select GENERIC_TIME_VSYSCALL
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select GUP_GET_PXX_LOW_HIGH if CPU_MIPS32 && PHYS_ADDR_T_64BIT
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select HAS_IOPORT if !NO_IOPORT_MAP || ISA
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select HAVE_ARCH_COMPILER_H
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select HAVE_ARCH_JUMP_LABEL
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select HAVE_ARCH_KGDB if MIPS_FP_SUPPORT
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@ -47,6 +47,7 @@ config PARISC
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select MODULES_USE_ELF_RELA
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select CLONE_BACKWARDS
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select TTY # Needed for pdc_cons.c
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select HAS_IOPORT if PCI || EISA
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select HAVE_DEBUG_STACKOVERFLOW
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_ARCH_HASH
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@ -188,6 +188,7 @@ config PPC
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select GENERIC_SMP_IDLE_THREAD
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select GENERIC_TIME_VSYSCALL
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select GENERIC_VDSO_TIME_NS
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select HAS_IOPORT if PCI
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
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select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
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@ -74,6 +74,7 @@ config RISCV
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select GENERIC_TIME_VSYSCALL if MMU && 64BIT
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select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO
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select HARDIRQS_SW_RESEND
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select HAS_IOPORT if MMU
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
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select HAVE_ARCH_HUGE_VMAP if MMU && 64BIT && !XIP_KERNEL
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@ -25,6 +25,7 @@ config SUPERH
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select GENERIC_SCHED_CLOCK
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select GENERIC_SMP_IDLE_THREAD
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select GUP_GET_PXX_LOW_HIGH if X2TLB
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select HAS_IOPORT if HAS_IOPORT_MAP
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_ARCH_KGDB
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select HAVE_ARCH_SECCOMP_FILTER
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@ -32,6 +32,7 @@ config SPARC
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select GENERIC_IRQ_SHOW
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select ARCH_WANT_IPC_PARSE_VERSION
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select GENERIC_PCI_IOMAP
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select HAS_IOPORT
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select HAVE_NMI_WATCHDOG if SPARC64
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select HAVE_CBPF_JIT if SPARC32
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select HAVE_EBPF_JIT if SPARC64
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@ -162,6 +162,7 @@ config X86
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select GUP_GET_PXX_LOW_HIGH if X86_PAE
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select HARDIRQS_SW_RESEND
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select HARDLOCKUP_CHECK_TIMESTAMP if X86_64
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select HAS_IOPORT
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select HAVE_ACPI_APEI if ACPI
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select HAVE_ACPI_APEI_NMI if ACPI
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select HAVE_ALIGNED_STRUCT_PAGE if SLUB
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@ -81,7 +81,7 @@ config MOXTET
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config HISILICON_LPC
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bool "Support for ISA I/O space on HiSilicon Hip06/7"
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depends on (ARM64 && ARCH_HISI) || (COMPILE_TEST && !ALPHA && !HEXAGON && !PARISC)
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depends on HAS_IOMEM
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depends on HAS_IOPORT
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select INDIRECT_PIO if ARM64
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help
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Driver to enable I/O access to devices attached to the Low Pin
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@ -4,6 +4,7 @@ menu "Bus options (PCI, PCMCIA, EISA, GSC, ISA)"
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config GSC
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bool "VSC/GSC/HSC bus support"
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select HAVE_EISA
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select HAS_IOPORT
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default y
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help
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The VSC, GSC and HSC busses were used from the earliest 700-series
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@ -92,6 +92,7 @@ config ARCH_USE_SYM_ANNOTATIONS
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config INDIRECT_PIO
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bool "Access I/O in non-MMIO mode"
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depends on ARM64
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depends on HAS_IOPORT
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help
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On some platforms where no separate I/O space exists, there are I/O
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hosts which can not be accessed in MMIO mode. Using the logical PIO
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@ -509,6 +510,9 @@ config HAS_IOMEM
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depends on !NO_IOMEM
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default y
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config HAS_IOPORT
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bool
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config HAS_IOPORT_MAP
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bool
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depends on HAS_IOMEM && !NO_IOPORT_MAP
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