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| author |   Helge Deller <deller@gmx.de> | 2009-02-06 21:50:39 +0100 |
|---|---|---|
| committer |   Kyle McMartin <kyle@mcmartin.ca> | 2009-03-31 02:51:34 +0000 |
| commit | 548f1176f0ac637eff895defb715ce6fde7c460a (patch) | |
| tree | 8f0702675e15048ba3409d1d38452a4484fd9461 /arch | |
| parent | parisc: allow to build with 16k default kernel page size (diff) | |
| download | linux-dev-548f1176f0ac637eff895defb715ce6fde7c460a.tar.xz linux-dev-548f1176f0ac637eff895defb715ce6fde7c460a.zip | |
parisc: add LATENCYTOP_SUPPORT and CONFIG_STACKTRACE_SUPPORT
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/parisc/Kconfig | 6 | ||||
| -rw-r--r-- | arch/parisc/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/parisc/kernel/stacktrace.c | 63 |
3 files changed, 70 insertions, 0 deletions
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index aacf11d33723..4866e2f8d3bb 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -75,6 +75,9 @@ config GENERIC_HARDIRQS config GENERIC_IRQ_PROBE def_bool y +config HAVE_LATENCYTOP_SUPPORT + def_bool y + config IRQ_PER_CPU bool default y @@ -83,6 +86,9 @@ config IRQ_PER_CPU config PM bool +config STACKTRACE_SUPPORT + def_bool y + config ISA_DMA_API bool diff --git a/arch/parisc/kernel/Makefile b/arch/parisc/kernel/Makefile index 016d3fc4111c..a7ba8cd9417f 100644 --- a/arch/parisc/kernel/Makefile +++ b/arch/parisc/kernel/Makefile @@ -16,5 +16,6 @@ obj-$(CONFIG_PA11) += pci-dma.o obj-$(CONFIG_PCI) += pci.o obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_64BIT) += binfmt_elf32.o sys_parisc32.o signal32.o +obj-$(CONFIG_STACKTRACE)+= stacktrace.o # only supported for PCX-W/U in 64-bit mode at the moment obj-$(CONFIG_64BIT) += perf.o perf_asm.o diff --git a/arch/parisc/kernel/stacktrace.c b/arch/parisc/kernel/stacktrace.c new file mode 100644 index 000000000000..2fe914c5f533 --- /dev/null +++ b/arch/parisc/kernel/stacktrace.c @@ -0,0 +1,63 @@ +/* + * Stack trace management functions + * + * Copyright (C) 2009 Helge Deller <deller@gmx.de> + * based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com> + * and parisc unwind functions by Randolph Chung <tausq@debian.org> + * + * TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT) + */ +#include <linux/module.h> +#include <linux/stacktrace.h> + +#include <asm/unwind.h> + +static void dump_trace(struct task_struct *task, struct stack_trace *trace) +{ + struct unwind_frame_info info; + + /* initialize unwind info */ + if (task == current) { + unsigned long sp; + struct pt_regs r; +HERE: + asm volatile ("copy %%r30, %0" : "=r"(sp)); + memset(&r, 0, sizeof(struct pt_regs)); + r.iaoq[0] = (unsigned long)&&HERE; + r.gr[2] = (unsigned long)__builtin_return_address(0); + r.gr[30] = sp; + unwind_frame_init(&info, task, &r); + } else { + unwind_frame_init_from_blocked_task(&info, task); + } + + /* unwind stack and save entries in stack_trace struct */ + trace->nr_entries = 0; + while (trace->nr_entries < trace->max_entries) { + if (unwind_once(&info) < 0 || info.ip == 0) + break; + + if (__kernel_text_address(info.ip)) + trace->entries[trace->nr_entries++] = info.ip; + } +} + + +/* + * Save stack-backtrace addresses into a stack_trace buffer. + */ +void save_stack_trace(struct stack_trace *trace) +{ + dump_trace(current, trace); + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = ULONG_MAX; +} +EXPORT_SYMBOL_GPL(save_stack_trace); + +void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) +{ + dump_trace(tsk, trace); + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = ULONG_MAX; +} +EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |