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linux_dsm_epyc7002/arch/powerpc/Kconfig

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# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#
mainmenu "Linux/PowerPC Kernel Configuration"
source "arch/powerpc/platforms/Kconfig.cputype"
config PPC32
bool
default y if !PPC64
config 64BIT
bool
default y if PPC64
config WORD_SIZE
int
default 64 if PPC64
default 32 if !PPC64
config ARCH_PHYS_ADDR_T_64BIT
def_bool PPC64 || PHYS_64BIT
config MMU
bool
default y
config GENERIC_CMOS_UPDATE
def_bool y
config GENERIC_TIME
def_bool y
config GENERIC_TIME_VSYSCALL
def_bool y
config GENERIC_CLOCKEVENTS
def_bool y
config GENERIC_HARDIRQS
bool
default y
config HAVE_SETUP_PER_CPU_AREA
def_bool PPC64
config IRQ_PER_CPU
bool
default y
config STACKTRACE_SUPPORT
bool
default y
config HAVE_LATENCYTOP_SUPPORT
def_bool y
config TRACE_IRQFLAGS_SUPPORT
bool
depends on PPC64
default y
config LOCKDEP_SUPPORT
bool
default y
config RWSEM_GENERIC_SPINLOCK
bool
config RWSEM_XCHGADD_ALGORITHM
bool
default y
config GENERIC_LOCKBREAK
bool
default y
depends on SMP && PREEMPT
config ARCH_HAS_ILOG2_U32
bool
default y
config ARCH_HAS_ILOG2_U64
bool
default y if 64BIT
config GENERIC_HWEIGHT
bool
default y
config GENERIC_CALIBRATE_DELAY
bool
default y
config GENERIC_FIND_NEXT_BIT
bool
default y
config GENERIC_GPIO
bool
help
Generic GPIO API support
config ARCH_NO_VIRT_TO_BUS
def_bool PPC64
config PPC
bool
default y
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select ARCH_WANT_OPTIONAL_GPIOLIB
select HAVE_IDE
select HAVE_IOREMAP_PROT
select HAVE_EFFICIENT_UNALIGNED_ACCESS
select HAVE_KPROBES
select HAVE_ARCH_KGDB
select HAVE_KRETPROBES
select HAVE_ARCH_TRACEHOOK
select HAVE_LMB
select HAVE_DMA_ATTRS if PPC64
select USE_GENERIC_SMP_HELPERS if SMP
select HAVE_OPROFILE
select HAVE_SYSCALL_WRAPPERS if PPC64
config EARLY_PRINTK
bool
default y
config COMPAT
bool
default y if PPC64
select COMPAT_BINFMT_ELF
config SYSVIPC_COMPAT
bool
depends on COMPAT && SYSVIPC
default y
# All PPC32s use generic nvram driver through ppc_md
config GENERIC_NVRAM
bool
default y if PPC32
config SCHED_OMIT_FRAME_POINTER
bool
default y
config ARCH_MAY_HAVE_PC_FDC
bool
default !PPC_PSERIES || PCI
config PPC_OF
def_bool y
config OF
def_bool y
config PPC_UDBG_16550
bool
default n
config GENERIC_TBSYNC
bool
default y if PPC32 && SMP
default n
config AUDIT_ARCH
bool
default y
config GENERIC_BUG
bool
default y
depends on BUG
config SYS_SUPPORTS_APM_EMULATION
default y if PMAC_APM_EMU
bool
config DEFAULT_UIMAGE
bool
help
Used to allow a board to specify it wants a uImage built by default
default n
config REDBOOT
bool
config HIBERNATE_32
bool
depends on (PPC_PMAC && !SMP) || BROKEN
default y
config HIBERNATE_64
bool
depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
default y
config ARCH_HIBERNATION_POSSIBLE
bool
depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
default y
config ARCH_SUSPEND_POSSIBLE
def_bool y
depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
config PPC_DCR_NATIVE
bool
default n
config PPC_DCR_MMIO
bool
default n
config PPC_DCR
bool
depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
default y
config PPC_OF_PLATFORM_PCI
bool
depends on PCI
depends on PPC64 # not supported on 32 bits yet
default n
config ARCH_SUPPORTS_DEBUG_PAGEALLOC
def_bool y
source "init/Kconfig"
source "kernel/Kconfig.freezer"
source "arch/powerpc/sysdev/Kconfig"
source "arch/powerpc/platforms/Kconfig"
menu "Kernel options"
config HIGHMEM
bool "High memory support"
depends on PPC32
source kernel/time/Kconfig
source kernel/Kconfig.hz
source kernel/Kconfig.preempt
source "fs/Kconfig.binfmt"
config HUGETLB_PAGE_SIZE_VARIABLE
bool
depends on HUGETLB_PAGE
default y
config MATH_EMULATION
bool "Math emulation"
depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
---help---
Some PowerPC chips designed for embedded applications do not have
a floating-point unit and therefore do not implement the
floating-point instructions in the PowerPC instruction set. If you
say Y here, the kernel will include code to emulate a floating-point
unit, which will allow programs that use floating-point
instructions to run.
config 8XX_MINIMAL_FPEMU
bool "Minimal math emulation for 8xx"
depends on 8xx && !MATH_EMULATION
help
Older arch/ppc kernels still emulated a few floating point
instructions such as load and store, even when full math
emulation is disabled. Say "Y" here if you want to preserve
this behavior.
It is recommended that you build a soft-float userspace instead.
config IOMMU_VMERGE
bool "Enable IOMMU virtual merging"
depends on PPC64
default y
help
Cause IO segments sent to a device for DMA to be merged virtually
by the IOMMU when they happen to have been allocated contiguously.
This doesn't add pressure to the IOMMU allocator. However, some
drivers don't support getting large merged segments coming back
from *_map_sg().
Most drivers don't have this problem; it is safe to say Y here.
config IOMMU_HELPER
def_bool PPC64
config PPC_NEED_DMA_SYNC_OPS
def_bool y
depends on NOT_COHERENT_CACHE
config HOTPLUG_CPU
bool "Support for enabling/disabling CPUs"
depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
---help---
Say Y here to be able to disable and re-enable individual
CPUs at runtime on SMP machines.
Say N if you are unsure.
config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y
config ARCH_HAS_WALK_MEMORY
def_bool y
config ARCH_ENABLE_MEMORY_HOTREMOVE
def_bool y
config KEXEC
bool "kexec system call (EXPERIMENTAL)"
depends on BOOK3S && EXPERIMENTAL
help
kexec is a system call that implements the ability to shutdown your
current kernel, and to start another kernel. It is like a reboot
but it is independent of the system firmware. And like a reboot
you can start any kernel with it, not just Linux.
The name comes from the similarity to the exec system call.
It is an ongoing process to be certain the hardware in a machine
is properly shutdown, so do not be surprised if this code does not
initially work for you. It may help to enable device hotplugging
support. As of this writing the exact hardware interface is
strongly in flux, so no good recommendation can be made.
config CRASH_DUMP
bool "Build a kdump crash kernel"
depends on PPC64 || 6xx
select RELOCATABLE if PPC64
help
Build a kernel suitable for use as a kdump capture kernel.
The same kernel binary can be used as production kernel and dump
capture kernel.
config PHYP_DUMP
bool "Hypervisor-assisted dump (EXPERIMENTAL)"
depends on PPC_PSERIES && EXPERIMENTAL
help
Hypervisor-assisted dump is meant to be a kdump replacement
offering robustness and speed not possible without system
hypervisor assistance.
If unsure, say "N"
config PPCBUG_NVRAM
bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
default y if PPC_PREP
config IRQ_ALL_CPUS
bool "Distribute interrupts on all CPUs by default"
depends on SMP && !MV64360
help
This option gives the kernel permission to distribute IRQs across
multiple CPUs. Saying N here will route all IRQs to the first
CPU. Generally saying Y is safe, although some problems have been
reported with SMP Power Macintoshes with this option enabled.
config NUMA
bool "NUMA support"
depends on PPC64
default y if SMP && PPC_PSERIES
config NODES_SHIFT
int
default "4"
depends on NEED_MULTIPLE_NODES
config ARCH_SELECT_MEMORY_MODEL
def_bool y
depends on PPC64
config ARCH_FLATMEM_ENABLE
def_bool y
depends on (PPC64 && !NUMA) || PPC32
config ARCH_SPARSEMEM_ENABLE
def_bool y
depends on PPC64
select SPARSEMEM_VMEMMAP_ENABLE
config ARCH_SPARSEMEM_DEFAULT
def_bool y
depends on (SMP && PPC_PSERIES) || PPC_PS3
config ARCH_POPULATES_NODE_MAP
def_bool y
source "mm/Kconfig"
config ARCH_MEMORY_PROBE
def_bool y
depends on MEMORY_HOTPLUG
# Some NUMA nodes have memory ranges that span
# other nodes. Even though a pfn is valid and
# between a node's start and end pfns, it may not
# reside on that node. See memmap_init_zone()
# for details.
config NODES_SPAN_OTHER_NODES
def_bool y
depends on NEED_MULTIPLE_NODES
config PPC_HAS_HASH_64K
bool
depends on PPC64
default n
config STDBINUTILS
bool "Using standard binutils settings"
depends on 44x
default y
help
Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
Note, that kernel will be able to run only those applications,
which had been compiled using binutils later than 2.17.50.0.3 with
'-zmax-page-size' set to 256K (the default is 64K). Or, if using
the older binutils, you can patch them with a trivial patch, which
changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
choice
prompt "Page size"
default PPC_4K_PAGES
help
Select the kernel logical page size. Increasing the page size
will reduce software overhead at each page boundary, allow
hardware prefetch mechanisms to be more effective, and allow
larger dma transfers increasing IO efficiency and reducing
overhead. However the utilization of memory will increase.
For example, each cached file will using a multiple of the
page size to hold its contents and the difference between the
end of file and the end of page is wasted.
Some dedicated systems, such as software raid serving with
accelerated calculations, have shown significant increases.
If you configure a 64 bit kernel for 64k pages but the
processor does not support them, then the kernel will simulate
them with 4k pages, loading them on demand, but with the
reduced software overhead and larger internal fragmentation.
For the 32 bit kernel, a large page option will not be offered
unless it is supported by the configured processor.
If unsure, choose 4K_PAGES.
config PPC_4K_PAGES
bool "4k page size"
config PPC_16K_PAGES
bool "16k page size" if 44x
config PPC_64K_PAGES
bool "64k page size" if 44x || PPC_STD_MMU_64
select PPC_HAS_HASH_64K if PPC_STD_MMU_64
config PPC_256K_PAGES
bool "256k page size" if 44x
depends on !STDBINUTILS && (!SHMEM || BROKEN)
help
Make the page size 256k.
As the ELF standard only requires alignment to support page
sizes up to 64k, you will need to compile all of your user
space applications with a non-standard binutils settings
(see the STDBINUTILS description for details).
Say N unless you know what you are doing.
endchoice
config FORCE_MAX_ZONEORDER
int "Maximum zone order"
range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
range 11 64
default "11"
help
The kernel memory allocator divides physically contiguous memory
blocks into "zones", where each zone is a power of two number of
pages. This option selects the largest power of two that the kernel
keeps in the memory allocator. If you need to allocate very large
blocks of physically contiguous memory, then you may need to
increase this value.
This config option is actually maximum order plus one. For example,
a value of 11 means that the largest free memory block is 2^10 pages.
The page size is not necessarily 4KB. For example, on 64-bit
systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
this in mind when choosing a value for this option.
config PPC_SUBPAGE_PROT
bool "Support setting protections for 4k subpages"
depends on PPC_STD_MMU_64 && PPC_64K_PAGES
help
This option adds support for a system call to allow user programs
to set access permissions (read/write, readonly, or no access)
on the 4k subpages of each 64k page.
config SCHED_SMT
bool "SMT (Hyperthreading) scheduler support"
depends on PPC64 && SMP
help
SMT scheduler support improves the CPU scheduler's decision making
when dealing with POWER5 cpus at a cost of slightly increased
overhead in some places. If unsure say N here.
config PROC_DEVICETREE
bool "Support for device tree in /proc"
depends on PROC_FS
help
This option adds a device-tree directory under /proc which contains
an image of the device tree that the kernel copies from Open
Firmware or other boot firmware. If unsure, say Y here.
config CMDLINE_BOOL
bool "Default bootloader kernel arguments"
config CMDLINE
string "Initial kernel command string"
depends on CMDLINE_BOOL
default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
help
On some platforms, there is currently no way for the boot loader to
pass arguments to the kernel. For these platforms, you can supply
some command-line options at build time by entering them here. In
most cases you will need to specify the root device here.
config EXTRA_TARGETS
string "Additional default image types"
help
List additional targets to be built by the bootwrapper here (separated
by spaces). This is useful for targets that depend of device tree
files in the .dts directory.
Targets in this list will be build as part of the default build
target, or when the user does a 'make zImage' or a
'make zImage.initrd'.
If unsure, leave blank
if !44x || BROKEN
config ARCH_WANTS_FREEZER_CONTROL
def_bool y
depends on ADB_PMU
source kernel/power/Kconfig
endif
config SECCOMP
bool "Enable seccomp to safely compute untrusted bytecode"
depends on PROC_FS
default y
help
This kernel feature is useful for number crunching applications
that may need to compute untrusted bytecode during their
execution. By using pipes or other transports made available to
the process as file descriptors supporting the read/write
syscalls, it's possible to isolate those applications in
their own address space using seccomp. Once seccomp is
enabled via /proc/<pid>/seccomp, it cannot be disabled
and the task is only allowed to execute a few safe syscalls
defined by each seccomp mode.
If unsure, say Y. Only embedded should say N here.
endmenu
config ISA_DMA_API
bool
default !PPC_ISERIES || PCI
menu "Bus options"
config ISA
bool "Support for ISA-bus hardware"
depends on PPC_PREP || PPC_CHRP
select PPC_I8259
help
Find out whether you have ISA slots on your motherboard. ISA is the
name of a bus system, i.e. the way the CPU talks to the other stuff
inside your box. If you have an Apple machine, say N here; if you
have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
you have an embedded board, consult your board documentation.
config ZONE_DMA
bool
default y
config GENERIC_ISA_DMA
bool
depends on PPC64 || POWER4 || 6xx && !CPM2
default y
config PPC_INDIRECT_PCI
bool
depends on PCI
default y if 40x || 44x
default n
config EISA
bool
config SBUS
bool
config FSL_SOC
bool
config FSL_PCI
bool
select PPC_INDIRECT_PCI
select PCI_QUIRKS
config 4xx_SOC
bool
config FSL_LBC
bool
help
Freescale Localbus support
config FSL_GTM
bool
depends on PPC_83xx || QUICC_ENGINE || CPM2
help
Freescale General-purpose Timers support
# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
config MCA
bool
# Platforms that what PCI turned unconditionally just do select PCI
# in their config node. Platforms that want to choose at config
# time should select PPC_PCI_CHOICE
config PPC_PCI_CHOICE
bool
config PCI
bool "PCI support" if PPC_PCI_CHOICE
default y if !40x && !CPM2 && !8xx && !PPC_83xx \
&& !PPC_85xx && !PPC_86xx
default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
default PCI_QSPAN if !4xx && !CPM2 && 8xx
select ARCH_SUPPORTS_MSI
help
Find out whether your system includes a PCI bus. PCI is the name of
a bus system, i.e. the way the CPU talks to the other stuff inside
your box. If you say Y here, the kernel will include drivers and
infrastructure code to support PCI bus devices.
config PCI_DOMAINS
def_bool PCI
config PCI_SYSCALL
def_bool PCI
config PCI_QSPAN
bool "QSpan PCI"
depends on !4xx && !CPM2 && 8xx
select PPC_I8259
help
Say Y here if you have a system based on a Motorola 8xx-series
embedded processor with a QSPAN PCI interface, otherwise say N.
config PCI_8260
bool
depends on PCI && 8260
select PPC_INDIRECT_PCI
default y
config 8260_PCI9
bool "Enable workaround for MPC826x erratum PCI 9"
depends on PCI_8260 && !8272
default y
choice
prompt "IDMA channel for PCI 9 workaround"
depends on 8260_PCI9
config 8260_PCI9_IDMA1
bool "IDMA1"
config 8260_PCI9_IDMA2
bool "IDMA2"
config 8260_PCI9_IDMA3
bool "IDMA3"
config 8260_PCI9_IDMA4
bool "IDMA4"
endchoice
source "drivers/pci/pcie/Kconfig"
source "drivers/pci/Kconfig"
source "drivers/pcmcia/Kconfig"
source "drivers/pci/hotplug/Kconfig"
config HAS_RAPIDIO
bool
default n
config RAPIDIO
bool "RapidIO support"
depends on HAS_RAPIDIO
help
If you say Y here, the kernel will include drivers and
infrastructure code to support RapidIO interconnect devices.
source "drivers/rapidio/Kconfig"
endmenu
menu "Advanced setup"
depends on PPC32
config ADVANCED_OPTIONS
bool "Prompt for advanced kernel configuration options"
help
This option will enable prompting for a variety of advanced kernel
configuration options. These options can cause the kernel to not
work if they are set incorrectly, but can be used to optimize certain
aspects of kernel memory management.
Unless you know what you are doing, say N here.
comment "Default settings for advanced configuration options are used"
depends on !ADVANCED_OPTIONS
config LOWMEM_SIZE_BOOL
bool "Set maximum low memory"
depends on ADVANCED_OPTIONS
help
This option allows you to set the maximum amount of memory which
will be used as "low memory", that is, memory which the kernel can
access directly, without having to set up a kernel virtual mapping.
This can be useful in optimizing the layout of kernel virtual
memory.
Say N here unless you know what you are doing.
config LOWMEM_SIZE
hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
default "0x30000000"
config LOWMEM_CAM_NUM_BOOL
bool "Set number of CAMs to use to map low memory"
depends on ADVANCED_OPTIONS && FSL_BOOKE
help
This option allows you to set the maximum number of CAM slots that
will be used to map low memory. There are a limited number of slots
available and even more limited number that will fit in the L1 MMU.
However, using more entries will allow mapping more low memory. This
can be useful in optimizing the layout of kernel virtual memory.
Say N here unless you know what you are doing.
config LOWMEM_CAM_NUM
depends on FSL_BOOKE
int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
default 3
config RELOCATABLE
bool "Build a relocatable kernel (EXPERIMENTAL)"
depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
help
This builds a kernel image that is capable of running at the
location the kernel is loaded at (some alignment restrictions may
exist).
One use is for the kexec on panic case where the recovery kernel
must live at a different physical address than the primary
kernel.
Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
it has been loaded at and the compile time physical addresses
CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
setting can still be useful to bootwrappers that need to know the
load location of the kernel (eg. u-boot/mkimage).
config PAGE_OFFSET_BOOL
bool "Set custom page offset address"
depends on ADVANCED_OPTIONS
help
This option allows you to set the kernel virtual address at which
the kernel will map low memory. This can be useful in optimizing
the virtual memory layout of the system.
Say N here unless you know what you are doing.
config PAGE_OFFSET
hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
default "0xc0000000"
config KERNEL_START_BOOL
bool "Set custom kernel base address"
depends on ADVANCED_OPTIONS
help
This option allows you to set the kernel virtual address at which
the kernel will be loaded. Normally this should match PAGE_OFFSET
however there are times (like kdump) that one might not want them
to be the same.
Say N here unless you know what you are doing.
config KERNEL_START
hex "Virtual address of kernel base" if KERNEL_START_BOOL
default PAGE_OFFSET if PAGE_OFFSET_BOOL
default "0xc2000000" if CRASH_DUMP
default "0xc0000000"
config PHYSICAL_START_BOOL
bool "Set physical address where the kernel is loaded"
depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
help
This gives the physical address where the kernel is loaded.
Say N here unless you know what you are doing.
config PHYSICAL_START
hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
default "0x00000000"
config PHYSICAL_ALIGN
hex
default "0x04000000" if FSL_BOOKE
help
This value puts the alignment restrictions on physical address
where kernel is loaded and run from. Kernel is compiled for an
address which meets above alignment restriction.
config TASK_SIZE_BOOL
bool "Set custom user task size"
depends on ADVANCED_OPTIONS
help
This option allows you to set the amount of virtual address space
allocated to user tasks. This can be useful in optimizing the
virtual memory layout of the system.
Say N here unless you know what you are doing.
config TASK_SIZE
hex "Size of user task space" if TASK_SIZE_BOOL
default "0x80000000" if PPC_PREP || PPC_8xx
default "0xc0000000"
config PIN_TLB
bool "Pinned Kernel TLBs (860 ONLY)"
depends on ADVANCED_OPTIONS && 8xx
endmenu
if PPC64
config RELOCATABLE
bool "Build a relocatable kernel"
help
This builds a kernel image that is capable of running anywhere
in the RMA (real memory area) at any 16k-aligned base address.
The kernel is linked as a position-independent executable (PIE)
and contains dynamic relocations which are processed early
in the bootup process.
One use is for the kexec on panic case where the recovery kernel
must live at a different physical address than the primary
kernel.
config PAGE_OFFSET
hex
default "0xc000000000000000"
config KERNEL_START
hex
default "0xc000000000000000"
config PHYSICAL_START
hex
default "0x00000000"
endif
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
source "arch/powerpc/sysdev/qe_lib/Kconfig"
source "lib/Kconfig"
source "arch/powerpc/Kconfig.debug"
source "security/Kconfig"
config KEYS_COMPAT
bool
depends on COMPAT && KEYS
default y
source "crypto/Kconfig"
config PPC_CLOCK
bool
default n
select HAVE_CLK
config PPC_LIB_RHEAP
bool
source "arch/powerpc/kvm/Kconfig"
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