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