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linux/arch/tile/Kconfig
Chris Metcalf 76c567fbba arch/tile: support 4KB page size as well as 64KB 
The Tilera architecture traditionally supports 64KB page sizes
to improve TLB utilization and improve performance when the
hardware is being used primarily to run a single application.

For more generic server scenarios, it can be beneficial to run
with 4KB page sizes, so this commit allows that to be specified
(by modifying the arch/tile/include/hv/pagesize.h header).

As part of this change, we also re-worked the PTE management
slightly so that PTE writes all go through a __set_pte() function
where we can do some additional validation.  The set_pte_order()
function was eliminated since the "order" argument wasn't being used.

One bug uncovered was in the PCI DMA code, which wasn't properly
flushing the specified range.  This was benign with 64KB pages,
but with 4KB pages we were getting some larger flushes wrong.

The per-cpu memory reservation code also needed updating to
conform with the newer percpu stuff; before it always chose 64KB,
and that was always correct, but with 4KB granularity we now have
to pay closer attention and reserve the amount of memory that will
be requested when the percpu code starts allocating.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2011-03-10 13:17:53 -05:00

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# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
config TILE
def_bool y
select HAVE_KVM if !TILEGX
select GENERIC_FIND_FIRST_BIT
select GENERIC_FIND_NEXT_BIT
select USE_GENERIC_SMP_HELPERS
select CC_OPTIMIZE_FOR_SIZE
select HAVE_GENERIC_HARDIRQS
select GENERIC_IRQ_PROBE
select GENERIC_PENDING_IRQ if SMP
select GENERIC_HARDIRQS_NO_DEPRECATED
# FIXME: investigate whether we need/want these options.
# select HAVE_IOREMAP_PROT
# select HAVE_OPTPROBES
# select HAVE_REGS_AND_STACK_ACCESS_API
# select HAVE_HW_BREAKPOINT
# select PERF_EVENTS
# select HAVE_USER_RETURN_NOTIFIER
# config NO_BOOTMEM
# config ARCH_SUPPORTS_DEBUG_PAGEALLOC
# config HUGETLB_PAGE_SIZE_VARIABLE
config MMU
def_bool y
config GENERIC_CSUM
def_bool y
config SEMAPHORE_SLEEPERS
def_bool y
config HAVE_ARCH_ALLOC_REMAP
def_bool y
config HAVE_SETUP_PER_CPU_AREA
def_bool y
config NEED_PER_CPU_PAGE_FIRST_CHUNK
def_bool y
config SYS_SUPPORTS_HUGETLBFS
def_bool y
config GENERIC_TIME
def_bool y
config GENERIC_CLOCKEVENTS
def_bool y
# FIXME: tilegx can implement a more efficent rwsem.
config RWSEM_GENERIC_SPINLOCK
def_bool y
# We have a very flat architecture from a migration point of view,
# so save boot time by presetting this (particularly useful on tile-sim).
config DEFAULT_MIGRATION_COST
int
default "10000000"
# We only support gcc 4.4 and above, so this should work.
config ARCH_SUPPORTS_OPTIMIZED_INLINING
def_bool y
config ARCH_PHYS_ADDR_T_64BIT
def_bool y
config ARCH_DMA_ADDR_T_64BIT
def_bool y
config LOCKDEP_SUPPORT
def_bool y
config STACKTRACE_SUPPORT
def_bool y
select STACKTRACE
# We use discontigmem for now; at some point we may want to switch
# to sparsemem (Tilera bug 7996).
config ARCH_DISCONTIGMEM_ENABLE
def_bool y
config ARCH_DISCONTIGMEM_DEFAULT
def_bool y
config TRACE_IRQFLAGS_SUPPORT
def_bool y
config STRICT_DEVMEM
def_bool y
# SMP is required for Tilera Linux.
config SMP
def_bool y
# Allow checking for compile-time determined overflow errors in
# copy_from_user(). There are still unprovable places in the
# generic code as of 2.6.34, so this option is not really compatible
# with -Werror, which is more useful in general.
config DEBUG_COPY_FROM_USER
def_bool n
config HVC_TILE
select HVC_DRIVER
def_bool y
# Please note: TILE-Gx support is not yet finalized; this is
# the preliminary support. TILE-Gx drivers are only provided
# with the alpha or beta test versions for Tilera customers.
config TILEGX
depends on EXPERIMENTAL
bool "Building with TILE-Gx (64-bit) compiler and toolchain"
config 64BIT
depends on TILEGX
def_bool y
config ARCH_DEFCONFIG
string
default "arch/tile/configs/tile_defconfig" if !TILEGX
default "arch/tile/configs/tilegx_defconfig" if TILEGX
source "init/Kconfig"
menu "Tilera-specific configuration"
config NR_CPUS
int "Maximum number of tiles (2-255)"
range 2 255
depends on SMP
default "64"
---help---
Building with 64 is the recommended value, but a slightly
smaller kernel memory footprint results from using a smaller
value on chips with fewer tiles.
source "kernel/time/Kconfig"
source "kernel/Kconfig.hz"
config KEXEC
bool "kexec system call"
---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. It is used
to implement the "mboot" Tilera booter.
The name comes from the similarity to the exec system call.
config COMPAT
bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
depends on TILEGX
select COMPAT_BINFMT_ELF
default y
---help---
If enabled, the kernel will support running TILE-Gx binaries
that were built with the -m32 option.
config SYSVIPC_COMPAT
def_bool y
depends on COMPAT && SYSVIPC
# We do not currently support disabling HIGHMEM on tile64 and tilepro.
config HIGHMEM
bool # "Support for more than 512 MB of RAM"
default !TILEGX
---help---
Linux can use the full amount of RAM in the system by
default. However, the address space of TILE processors is
only 4 Gigabytes large. That means that, if you have a large
amount of physical memory, not all of it can be "permanently
mapped" by the kernel. The physical memory that's not
permanently mapped is called "high memory".
If you are compiling a kernel which will never run on a
machine with more than 512 MB total physical RAM, answer
"false" here. This will result in the kernel mapping all of
physical memory into the top 1 GB of virtual memory space.
If unsure, say "true".
# We do not currently support disabling NUMA.
config NUMA
bool # "NUMA Memory Allocation and Scheduler Support"
depends on SMP && DISCONTIGMEM
default y
---help---
NUMA memory allocation is required for TILE processors
unless booting with memory striping enabled in the
hypervisor, or with only a single memory controller.
It is recommended that this option always be enabled.
config NODES_SHIFT
int "Log base 2 of the max number of memory controllers"
default 2
depends on NEED_MULTIPLE_NODES
---help---
By default, 2, i.e. 2^2 == 4 DDR2 controllers.
In a system with more controllers, this value should be raised.
choice
depends on !TILEGX
prompt "Memory split" if EXPERT
default VMSPLIT_3G
---help---
Select the desired split between kernel and user memory.
If the address range available to the kernel is less than the
physical memory installed, the remaining memory will be available
as "high memory". Accessing high memory is a little more costly
than low memory, as it needs to be mapped into the kernel first.
Note that increasing the kernel address space limits the range
available to user programs, making the address space there
tighter. Selecting anything other than the default 3G/1G split
will also likely make your kernel incompatible with binary-only
kernel modules.
If you are not absolutely sure what you are doing, leave this
option alone!
config VMSPLIT_3_75G
bool "3.75G/0.25G user/kernel split (no kernel networking)"
config VMSPLIT_3_5G
bool "3.5G/0.5G user/kernel split"
config VMSPLIT_3G
bool "3G/1G user/kernel split"
config VMSPLIT_2_75G
bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
config VMSPLIT_2_5G
bool "2.5G/1.5G user/kernel split"
config VMSPLIT_2_25G
bool "2.25G/1.75G user/kernel split"
config VMSPLIT_2G
bool "2G/2G user/kernel split"
config VMSPLIT_1G
bool "1G/3G user/kernel split"
endchoice
config PAGE_OFFSET
hex
default 0xF0000000 if VMSPLIT_3_75G
default 0xE0000000 if VMSPLIT_3_5G
default 0xB0000000 if VMSPLIT_2_75G
default 0xA0000000 if VMSPLIT_2_5G
default 0x90000000 if VMSPLIT_2_25G
default 0x80000000 if VMSPLIT_2G
default 0x40000000 if VMSPLIT_1G
default 0xC0000000
source "mm/Kconfig"
config CMDLINE_BOOL
bool "Built-in kernel command line"
default n
---help---
Allow for specifying boot arguments to the kernel at
build time. On some systems (e.g. embedded ones), it is
necessary or convenient to provide some or all of the
kernel boot arguments with the kernel itself (that is,
to not rely on the boot loader to provide them.)
To compile command line arguments into the kernel,
set this option to 'Y', then fill in the
the boot arguments in CONFIG_CMDLINE.
Systems with fully functional boot loaders (e.g. mboot, or
if booting over PCI) should leave this option set to 'N'.
config CMDLINE
string "Built-in kernel command string"
depends on CMDLINE_BOOL
default ""
---help---
Enter arguments here that should be compiled into the kernel
image and used at boot time. If the boot loader provides a
command line at boot time, it is appended to this string to
form the full kernel command line, when the system boots.
However, you can use the CONFIG_CMDLINE_OVERRIDE option to
change this behavior.
In most cases, the command line (whether built-in or provided
by the boot loader) should specify the device for the root
file system.
config CMDLINE_OVERRIDE
bool "Built-in command line overrides boot loader arguments"
default n
depends on CMDLINE_BOOL
---help---
Set this option to 'Y' to have the kernel ignore the boot loader
command line, and use ONLY the built-in command line.
This is used to work around broken boot loaders. This should
be set to 'N' under normal conditions.
config VMALLOC_RESERVE
hex
default 0x1000000
config HARDWALL
bool "Hardwall support to allow access to user dynamic network"
default y
config KERNEL_PL
int "Processor protection level for kernel"
range 1 2
default "1"
---help---
This setting determines the processor protection level the
kernel will be built to run at. Generally you should use
the default value here.
endmenu # Tilera-specific configuration
menu "Bus options"
config PCI
bool "PCI support"
default y
select PCI_DOMAINS
---help---
Enable PCI root complex support, so PCIe endpoint devices can
be attached to the Tile chip. Many, but not all, PCI devices
are supported under Tilera's root complex driver.
config PCI_DOMAINS
bool
config NO_IOMEM
def_bool !PCI
config NO_IOPORT
def_bool !PCI
source "drivers/pci/Kconfig"
source "drivers/pci/hotplug/Kconfig"
endmenu
menu "Executable file formats"
# only elf supported
config KCORE_ELF
def_bool y
depends on PROC_FS
source "fs/Kconfig.binfmt"
endmenu
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
source "arch/tile/Kconfig.debug"
source "security/Kconfig"
source "crypto/Kconfig"
source "lib/Kconfig"
source "arch/tile/kvm/Kconfig"
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