Kconfig: introduce HAS_IOPORT option and select it as necessary

JIRA: https://issues.redhat.com/browse/RHEL-22462
Conflicts:
* Ignoring CONFIG changes on architectures that aren't supported

commit fcbfe8121a45152a3cfbe1c28c96a3b611b7347d
Author: Niklas Schnelle <schnelle@linux.ibm.com>
Date: Thu, 23 Mar 2023 17:33:52 +0100

  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>

Signed-off-by: Desnes Nunes <desnesn@redhat.com>

arch/alpha/Kconfig

@@ -29,6 +29,7 @@ config ALPHA
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_STRNCPY_FROM_USER
 	select GENERIC_STRNLEN_USER
+	select HAS_IOPORT
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_MOD_ARCH_SPECIFIC
 	select MODULES_USE_ELF_RELA

arch/arm/Kconfig

@@ -71,6 +71,7 @@ config ARM
 	select HANDLE_DOMAIN_IRQ
 	select HANDLE_DOMAIN_IRQ_IRQENTRY
 	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

arch/arm64/Kconfig

@@ -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

arch/ia64/Kconfig

@@ -23,6 +23,7 @@ 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

arch/m68k/Kconfig

@@ -19,6 +19,7 @@ config M68K
 	select GENERIC_STRNCPY_FROM_USER
 	select GENERIC_STRNLEN_USER
 	select HAVE_AOUT if MMU
+	select HAS_IOPORT if PCI || ISA || ATARI_ROM_ISA
 	select HAVE_ASM_MODVERSIONS
 	select HAVE_DEBUG_BUGVERBOSE
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS if !CPU_HAS_NO_UNALIGNED

arch/microblaze/Kconfig

@@ -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

arch/mips/Kconfig

@@ -45,6 +45,7 @@ config MIPS
 	select GENERIC_TIME_VSYSCALL
 	select GUP_GET_PTE_LOW_HIGH if CPU_MIPS32 && PHYS_ADDR_T_64BIT
 	select HANDLE_DOMAIN_IRQ
+	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

arch/parisc/Kconfig

@@ -42,6 +42,7 @@ 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

arch/powerpc/Kconfig

@@ -178,6 +178,7 @@ 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

arch/riscv/Kconfig

@@ -62,6 +62,7 @@ config RISCV
 	select GENERIC_TIME_VSYSCALL if MMU && 64BIT
 	select HANDLE_DOMAIN_IRQ
 	select HANDLE_DOMAIN_IRQ_IRQENTRY
+	select HAS_IOPORT if MMU
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
 	select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL

arch/sh/Kconfig

@@ -27,6 +27,7 @@ config SUPERH
 	select GENERIC_STRNLEN_USER
 	select GENERIC_SMP_IDLE_THREAD
 	select GUP_GET_PTE_LOW_HIGH if X2TLB
+	select HAS_IOPORT if HAS_IOPORT_MAP
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_SECCOMP_FILTER

arch/sparc/Kconfig

@@ -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

arch/x86/Kconfig

@@ -161,6 +161,7 @@ config X86
 	select GUP_GET_PTE_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

drivers/bus/Kconfig

@@ -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

drivers/parisc/Kconfig

@@ -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

lib/Kconfig

@@ -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
@@ -505,6 +506,9 @@ 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