linux/arch/tile/Kconfig

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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_DMA_ATTRS
select HAVE_DMA_API_DEBUG
select HAVE_KVM if !TILEGX
select GENERIC_FIND_FIRST_BIT
select SYSCTL_EXCEPTION_TRACE
select USE_GENERIC_SMP_HELPERS
select CC_OPTIMIZE_FOR_SIZE
select HAVE_DEBUG_KMEMLEAK
select HAVE_GENERIC_HARDIRQS
select GENERIC_IRQ_PROBE
select GENERIC_PENDING_IRQ if SMP
select GENERIC_IRQ_SHOW
select HAVE_DEBUG_BUGVERBOSE
select HAVE_SYSCALL_WRAPPERS if TILEGX
select VIRT_TO_BUS
arch/tile: more /proc and /sys file support This change introduces a few of the less controversial /proc and /proc/sys interfaces for tile, along with sysfs attributes for various things that were originally proposed as /proc/tile files. It also adjusts the "hardwall" proc API. Arnd Bergmann reviewed the initial arch/tile submission, which included a complete set of all the /proc/tile and /proc/sys/tile knobs that we had added in a somewhat ad hoc way during initial development, and provided feedback on where most of them should go. One knob turned out to be similar enough to the existing /proc/sys/debug/exception-trace that it was re-implemented to use that model instead. Another knob was /proc/tile/grid, which reported the "grid" dimensions of a tile chip (e.g. 8x8 processors = 64-core chip). Arnd suggested looking at sysfs for that, so this change moves that information to a pair of sysfs attributes (chip_width and chip_height) in the /sys/devices/system/cpu directory. We also put the "chip_serial" and "chip_revision" information from our old /proc/tile/board file as attributes in /sys/devices/system/cpu. Other information collected via hypervisor APIs is now placed in /sys/hypervisor. We create a /sys/hypervisor/type file (holding the constant string "tilera") to be parallel with the Xen use of /sys/hypervisor/type holding "xen". We create three top-level files, "version" (the hypervisor's own version), "config_version" (the version of the configuration file), and "hvconfig" (the contents of the configuration file). The remaining information from our old /proc/tile/board and /proc/tile/switch files becomes an attribute group appearing under /sys/hypervisor/board/. Finally, after some feedback from Arnd Bergmann for the previous version of this patch, the /proc/tile/hardwall file is split up into two conceptual parts. First, a directory /proc/tile/hardwall/ which contains one file per active hardwall, each file named after the hardwall's ID and holding a cpulist that says which cpus are enclosed by the hardwall. Second, a /proc/PID file "hardwall" that is either empty (for non-hardwall-using processes) or contains the hardwall ID. Finally, this change pushes the /proc/sys/tile/unaligned_fixup/ directory, with knobs controlling the kernel code for handling the fixup of unaligned exceptions. Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2011-05-26 16:40:09 +00:00
select SYS_HYPERVISOR
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_CLOCKEVENTS
2012-09-28 05:01:03 +00:00
select MODULES_USE_ELF_RELA
# 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
# Support for additional huge page sizes besides HPAGE_SIZE.
# The software support is currently only present in the TILE-Gx
# hypervisor. TILEPro in any case does not support page sizes
# larger than the default HPAGE_SIZE.
config HUGETLB_SUPER_PAGES
depends on HUGETLB_PAGE && TILEGX
def_bool y
# FIXME: tilegx can implement a more efficient 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 NEED_DMA_MAP_STATE
def_bool y
config ARCH_HAS_DMA_SET_COHERENT_MASK
bool
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
depends on TTY
select HVC_DRIVER
def_bool y
config TILEGX
bool "Building with TILE-Gx (64-bit) compiler and toolchain"
config TILEPRO
def_bool !TILEGX
config 64BIT
def_bool TILEGX
config ARCH_DEFCONFIG
string
default "arch/tile/configs/tilepro_defconfig" if !TILEGX
default "arch/tile/configs/tilegx_defconfig" if TILEGX
source "init/Kconfig"
source "kernel/Kconfig.freezer"
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.
if TILEGX
choice
prompt "Kernel page size"
default PAGE_SIZE_64KB
help
This lets you select the page size of the kernel. For best
performance on memory-intensive applications, a page size of 64KB
is recommended. For workloads involving many small files, many
connections, etc., it may be better to select 16KB, which uses
memory more efficiently at some cost in TLB performance.
Note that this option is TILE-Gx specific; currently
TILEPro page size is set by rebuilding the hypervisor.
config PAGE_SIZE_16KB
bool "16KB"
config PAGE_SIZE_64KB
bool "64KB"
endchoice
endif
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".
config ZONE_DMA
def_bool y
config IOMMU_HELPER
bool
config NEED_SG_DMA_LENGTH
bool
config SWIOTLB
bool
default TILEGX
select IOMMU_HELPER
select NEED_SG_DMA_LENGTH
select ARCH_HAS_DMA_SET_COHERENT_MASK
# 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
depends on !64BIT
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
arch/tile: Add driver to enable access to the user dynamic network. This network (the "UDN") connects all the cpus on the chip in a wormhole-routed dynamic network. Subrectangles of the chip can be allocated by a "create" ioctl on /dev/hardwall, and then to access the UDN in that rectangle, tasks must perform an "activate" ioctl on that same file object after affinitizing themselves to a single cpu in the region. Sending a wormhole-routed message that tries to leave that subrectangle causes all activated tasks to receive a SIGILL (just as they would if they tried to access the UDN without first activating themselves to a hardwall rectangle). The original submission of this code to LKML had the driver instantiated under /proc/tile/hardwall. Now we just use a character device for this, conventionally /dev/hardwall. Some futures planning for the TILE-Gx chip suggests that we may want to have other types of devices that share the general model of "bind a task to a cpu, then 'activate' a file descriptor on a pseudo-device that gives access to some hardware resource". As such, we are using a device rather than, for example, a syscall, to set up and activate this code. As part of this change, the compat_ptr() declaration was fixed and used to pass the compat_ioctl argument to the normal ioctl. So far we limit compat code to 2GB, so the difference between zero-extend and sign-extend (the latter being correct, eventually) had been overlooked. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2010-06-25 21:00:56 +00:00
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.
arch/tile: introduce GXIO IORPC framework for tilegx The GXIO I/O RPC subsystem handles exporting I/O hardware resources to Linux and to applications running under Linux. For instance, memory which is made available for I/O DMA must be mapped by an I/O TLB; that means that such memory must be locked down by Linux, so that it is not swapped or otherwise reused, as long as those I/O TLB entries are active. Similarly, configuring direct hardware access introduces new validation requirements. If a user application registers memory, Linux must ensure that the supplied virtual addresses are valid, and turn them into client physical addresses. Similarly, when Linux then supplies those client physical addresses to the Tilera hypervisor, it must in turn validate those before turning them into the real physical addresses which are required by the hardware. To the extent that these sorts of activities were required on previous TILE architecture processors, they were implemented in a device-specific fashion. This meant that every I/O device had its own Tilera hypervisor driver, its own Linux driver, and in some cases its own user-level library support. There was a large amount of more-or-less functionally identical code in different places, particularly in the different Linux drivers. For TILE-Gx, this support has been generalized into a common framework, known as the I/O RPC framework or just IORPC. The two "gxio" directories (one for headers, one for sources) start with just a few files in each with this infrastructure commit, but after adding support for the on-board I/O shims for networking, PCI, USB, crypto, compression, I2CS, etc., there end up being about 20 files in each directory. More information on the IORPC framework is in the <hv/iorpc.h> header, included in this commit. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-04 20:39:58 +00:00
source "arch/tile/gxio/Kconfig"
endmenu # Tilera-specific configuration
menu "Bus options"
config PCI
bool "PCI support"
default y
select PCI_DOMAINS
select GENERIC_PCI_IOMAP
select TILE_GXIO_TRIO if TILEGX
select ARCH_SUPPORTS_MSI if TILEGX
select PCI_MSI if TILEGX
---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"
config TILE_USB
tristate "Tilera USB host adapter support"
default y
depends on USB
depends on TILEGX
select TILE_GXIO_USB_HOST
---help---
Provides USB host adapter support for the built-in EHCI and OHCI
interfaces on TILE-Gx chips.
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"