parisc: add LATENCYTOP_SUPPORT and CONFIG_STACKTRACE_SUPPORT

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index aacf11d33723edc80aa3638ba5256e83d0c74bf2..4866e2f8d3bb92e97ef4f732e819f6b7ed9260be 100644 (file)
--- 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 016d3fc4111c6bf3d22872dd23737cc880c15eb4..a7ba8cd9417f9b633d2db6a3d6fadd4bab7ec4e6 100644 (file)
--- 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 (file)
index 0000000..2fe914c
--- /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);