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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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85218827cc
This makes it possible to use separate stacks for hard and soft IRQs on 32-bit powerpc as well as on 64-bit. The code for 32-bit is just the 32-bit analog of the 64-bit code. * Added allocation and initialization of the irq stacks. We limit the stacks to be in lowmem for ppc32. * Implemented ppc32 versions of call_do_softirq() and call_handle_irq() to switch the stack pointers * Reworked how we do stack overflow detection. We now keep around the limit of the stack in the thread_struct and compare against the limit to see if we've overflowed. We can now use this on ppc64 if desired. [ paulus@samba.org: Fixed bug on 6xx where we need to reload r9 with the thread_info pointer. ] Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
283 lines
8.4 KiB
Plaintext
283 lines
8.4 KiB
Plaintext
menu "Kernel hacking"
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source "lib/Kconfig.debug"
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config DEBUG_STACKOVERFLOW
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bool "Check for stack overflows"
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depends on DEBUG_KERNEL
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help
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This option will cause messages to be printed if free stack space
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drops below a certain limit.
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config DEBUG_STACK_USAGE
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bool "Stack utilization instrumentation"
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depends on DEBUG_KERNEL
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help
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Enables the display of the minimum amount of free stack which each
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task has ever had available in the sysrq-T and sysrq-P debug output.
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This option will slow down process creation somewhat.
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config DEBUG_PAGEALLOC
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bool "Debug page memory allocations"
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depends on DEBUG_KERNEL && !HIBERNATION
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help
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Unmap pages from the kernel linear mapping after free_pages().
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This results in a large slowdown, but helps to find certain types
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of memory corruptions.
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config HCALL_STATS
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bool "Hypervisor call instrumentation"
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depends on PPC_PSERIES && DEBUG_FS
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help
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Adds code to keep track of the number of hypervisor calls made and
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the amount of time spent in hypervisor calls. Wall time spent in
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each call is always calculated, and if available CPU cycles spent
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are also calculated. A directory named hcall_inst is added at the
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root of the debugfs filesystem. Within the hcall_inst directory
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are files that contain CPU specific call statistics.
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This option will add a small amount of overhead to all hypervisor
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calls.
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config DEBUGGER
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bool "Enable debugger hooks"
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depends on DEBUG_KERNEL
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help
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Include in-kernel hooks for kernel debuggers. Unless you are
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intending to debug the kernel, say N here.
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config KGDB
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bool "Include kgdb kernel debugger"
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depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx)
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select DEBUG_INFO
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help
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Include in-kernel hooks for kgdb, the Linux kernel source level
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debugger. See <http://kgdb.sourceforge.net/> for more information.
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Unless you are intending to debug the kernel, say N here.
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choice
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prompt "Serial Port"
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depends on KGDB
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default KGDB_TTYS1
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config KGDB_TTYS0
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bool "ttyS0"
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config KGDB_TTYS1
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bool "ttyS1"
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config KGDB_TTYS2
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bool "ttyS2"
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config KGDB_TTYS3
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bool "ttyS3"
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endchoice
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config KGDB_CONSOLE
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bool "Enable serial console thru kgdb port"
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depends on KGDB && 8xx || CPM2
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help
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If you enable this, all serial console messages will be sent
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over the gdb stub.
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If unsure, say N.
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config XMON
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bool "Include xmon kernel debugger"
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depends on DEBUGGER
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help
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Include in-kernel hooks for the xmon kernel monitor/debugger.
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Unless you are intending to debug the kernel, say N here.
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Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
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nothing will appear on the screen (xmon writes directly to the
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framebuffer memory).
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The cmdline option 'xmon' or 'xmon=early' will drop into xmon
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very early during boot. 'xmon=on' will just enable the xmon
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debugger hooks. 'xmon=off' will disable the debugger hooks
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if CONFIG_XMON_DEFAULT is set.
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xmon will print a backtrace on the very first invocation.
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'xmon=nobt' will disable this autobacktrace.
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config XMON_DEFAULT
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bool "Enable xmon by default"
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depends on XMON
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help
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xmon is normally disabled unless booted with 'xmon=on'.
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Use 'xmon=off' to disable xmon init during runtime.
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config XMON_DISASSEMBLY
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bool "Include disassembly support in xmon"
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depends on XMON
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default y
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help
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Include support for disassembling in xmon. You probably want
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to say Y here, unless you're building for a memory-constrained
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system.
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config IRQSTACKS
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bool "Use separate kernel stacks when processing interrupts"
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help
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If you say Y here the kernel will use separate kernel stacks
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for handling hard and soft interrupts. This can help avoid
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overflowing the process kernel stacks.
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config VIRQ_DEBUG
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bool "Expose hardware/virtual IRQ mapping via debugfs"
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depends on DEBUG_FS && PPC_MERGE
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help
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This option will show the mapping relationship between hardware irq
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numbers and virtual irq numbers. The mapping is exposed via debugfs
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in the file powerpc/virq_mapping.
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If you don't know what this means you don't need it.
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config BDI_SWITCH
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bool "Include BDI-2000 user context switcher"
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depends on DEBUG_KERNEL && PPC32
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help
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Include in-kernel support for the Abatron BDI2000 debugger.
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Unless you are intending to debug the kernel with one of these
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machines, say N here.
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config BOOTX_TEXT
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bool "Support for early boot text console (BootX or OpenFirmware only)"
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depends on PPC_OF && PPC_MULTIPLATFORM
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help
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Say Y here to see progress messages from the boot firmware in text
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mode. Requires either BootX or Open Firmware.
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config PPC_EARLY_DEBUG
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bool "Early debugging (dangerous)"
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# PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
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# mark, which doesn't work with current 440 KVM.
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depends on !KVM
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help
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Say Y to enable some early debugging facilities that may be available
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for your processor/board combination. Those facilities are hacks
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intended to debug problems early during boot, this should not be
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enabled in a production kernel.
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Note that enabling this will also cause the kernel default log level
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to be pushed to max automatically very early during boot
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choice
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prompt "Early debugging console"
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depends on PPC_EARLY_DEBUG
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help
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Use the selected console for early debugging. Careful, if you
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enable debugging for the wrong type of machine your kernel
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_will not boot_.
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config PPC_EARLY_DEBUG_LPAR
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bool "LPAR HV Console"
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depends on PPC_PSERIES
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help
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Select this to enable early debugging for a machine with a HVC
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console on vterm 0.
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config PPC_EARLY_DEBUG_G5
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bool "Apple G5"
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depends on PPC_PMAC64
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help
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Select this to enable early debugging for Apple G5 machines.
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config PPC_EARLY_DEBUG_RTAS_PANEL
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bool "RTAS Panel"
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depends on PPC_RTAS
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help
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Select this to enable early debugging via the RTAS panel.
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config PPC_EARLY_DEBUG_RTAS_CONSOLE
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bool "RTAS Console"
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depends on PPC_RTAS
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select UDBG_RTAS_CONSOLE
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help
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Select this to enable early debugging via the RTAS console.
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config PPC_EARLY_DEBUG_MAPLE
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bool "Maple real mode"
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depends on PPC_MAPLE
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help
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Select this to enable early debugging for Maple.
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config PPC_EARLY_DEBUG_ISERIES
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bool "iSeries HV Console"
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depends on PPC_ISERIES
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help
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Select this to enable early debugging for legacy iSeries. You need
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to hit "Ctrl-x Ctrl-x" to see the messages on the console.
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config PPC_EARLY_DEBUG_PAS_REALMODE
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bool "PA Semi real mode"
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depends on PPC_PASEMI
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help
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Select this to enable early debugging for PA Semi.
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Output will be on UART0.
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config PPC_EARLY_DEBUG_BEAT
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bool "Beat HV Console"
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depends on PPC_CELLEB
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select PPC_UDBG_BEAT
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help
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Select this to enable early debugging for Celleb with Beat.
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config PPC_EARLY_DEBUG_44x
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bool "Early serial debugging for IBM/AMCC 44x CPUs"
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depends on 44x
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help
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Select this to enable early debugging for IBM 44x chips via the
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inbuilt serial port. If you enable this, ensure you set
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PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
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config PPC_EARLY_DEBUG_40x
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bool "Early serial debugging for IBM/AMCC 40x CPUs"
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depends on 40x
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help
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Select this to enable early debugging for IBM 40x chips via the
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inbuilt serial port. This works on chips with a 16550 compatible
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UART. Xilinx chips with uartlite cannot use this option.
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config PPC_EARLY_DEBUG_CPM
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bool "Early serial debugging for Freescale CPM-based serial ports"
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depends on SERIAL_CPM
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select PIN_TLB if PPC_8xx
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help
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Select this to enable early debugging for Freescale chips
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using a CPM-based serial port. This assumes that the bootwrapper
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has run, and set up the CPM in a particular way.
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endchoice
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config PPC_EARLY_DEBUG_44x_PHYSLOW
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hex "Low 32 bits of early debug UART physical address"
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depends on PPC_EARLY_DEBUG_44x
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default "0x40000200"
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help
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You probably want 0x40000200 for ebony boards and
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0x40000300 for taishan
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config PPC_EARLY_DEBUG_44x_PHYSHIGH
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hex "EPRN of early debug UART physical address"
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depends on PPC_EARLY_DEBUG_44x
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default "0x1"
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config PPC_EARLY_DEBUG_40x_PHYSADDR
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hex "Early debug UART physical address"
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depends on PPC_EARLY_DEBUG_40x
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default "0xef600300"
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config PPC_EARLY_DEBUG_CPM_ADDR
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hex "CPM UART early debug transmit descriptor address"
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depends on PPC_EARLY_DEBUG_CPM
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default "0xfa202008" if PPC_EP88XC
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default "0xf0001ff8" if CPM2
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default "0xff002008" if CPM1
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help
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This specifies the address of the transmit descriptor
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used for early debug output. Because it is needed before
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platform probing is done, all platforms selected must
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share the same address.
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endmenu
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