diff options
Diffstat (limited to 'kernel/arch/metag/oprofile')
-rw-r--r-- | kernel/arch/metag/oprofile/Makefile | 17 | ||||
-rw-r--r-- | kernel/arch/metag/oprofile/backtrace.c | 63 | ||||
-rw-r--r-- | kernel/arch/metag/oprofile/backtrace.h | 6 | ||||
-rw-r--r-- | kernel/arch/metag/oprofile/common.c | 66 |
4 files changed, 152 insertions, 0 deletions
diff --git a/kernel/arch/metag/oprofile/Makefile b/kernel/arch/metag/oprofile/Makefile new file mode 100644 index 000000000..c9639d473 --- /dev/null +++ b/kernel/arch/metag/oprofile/Makefile @@ -0,0 +1,17 @@ +obj-$(CONFIG_OPROFILE) += oprofile.o + +oprofile-core-y += buffer_sync.o +oprofile-core-y += cpu_buffer.o +oprofile-core-y += event_buffer.o +oprofile-core-y += oprof.o +oprofile-core-y += oprofile_files.o +oprofile-core-y += oprofile_stats.o +oprofile-core-y += oprofilefs.o +oprofile-core-y += timer_int.o +oprofile-core-$(CONFIG_HW_PERF_EVENTS) += oprofile_perf.o + +oprofile-y += backtrace.o +oprofile-y += common.o +oprofile-y += $(addprefix ../../../drivers/oprofile/,$(oprofile-core-y)) + +ccflags-y += -Werror diff --git a/kernel/arch/metag/oprofile/backtrace.c b/kernel/arch/metag/oprofile/backtrace.c new file mode 100644 index 000000000..7cc3f37cb --- /dev/null +++ b/kernel/arch/metag/oprofile/backtrace.c @@ -0,0 +1,63 @@ +/* + * Copyright (C) 2010-2013 Imagination Technologies Ltd. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/oprofile.h> +#include <linux/uaccess.h> +#include <asm/processor.h> +#include <asm/stacktrace.h> + +#include "backtrace.h" + +static void user_backtrace_fp(unsigned long __user *fp, unsigned int depth) +{ + while (depth-- && access_ok(VERIFY_READ, fp, 8)) { + unsigned long addr; + unsigned long __user *fpnew; + if (__copy_from_user_inatomic(&addr, fp + 1, sizeof(addr))) + break; + addr -= 4; + + oprofile_add_trace(addr); + + /* stack grows up, so frame pointers must decrease */ + if (__copy_from_user_inatomic(&fpnew, fp + 0, sizeof(fpnew))) + break; + if (fpnew >= fp) + break; + fp = fpnew; + } +} + +static int kernel_backtrace_frame(struct stackframe *frame, void *data) +{ + unsigned int *depth = data; + + oprofile_add_trace(frame->pc); + + /* decrement depth and stop if we reach 0 */ + if ((*depth)-- == 0) + return 1; + + /* otherwise onto the next frame */ + return 0; +} + +void metag_backtrace(struct pt_regs * const regs, unsigned int depth) +{ + if (user_mode(regs)) { + unsigned long *fp = (unsigned long *)regs->ctx.AX[1].U0; + user_backtrace_fp((unsigned long __user __force *)fp, depth); + } else { + struct stackframe frame; + frame.fp = regs->ctx.AX[1].U0; /* A0FrP */ + frame.sp = user_stack_pointer(regs); /* A0StP */ + frame.lr = 0; /* from stack */ + frame.pc = regs->ctx.CurrPC; /* PC */ + walk_stackframe(&frame, &kernel_backtrace_frame, &depth); + } +} diff --git a/kernel/arch/metag/oprofile/backtrace.h b/kernel/arch/metag/oprofile/backtrace.h new file mode 100644 index 000000000..c0fcc4265 --- /dev/null +++ b/kernel/arch/metag/oprofile/backtrace.h @@ -0,0 +1,6 @@ +#ifndef _METAG_OPROFILE_BACKTRACE_H +#define _METAG_OPROFILE_BACKTRACE_H + +void metag_backtrace(struct pt_regs * const regs, unsigned int depth); + +#endif diff --git a/kernel/arch/metag/oprofile/common.c b/kernel/arch/metag/oprofile/common.c new file mode 100644 index 000000000..ba26152b3 --- /dev/null +++ b/kernel/arch/metag/oprofile/common.c @@ -0,0 +1,66 @@ +/* + * arch/metag/oprofile/common.c + * + * Copyright (C) 2013 Imagination Technologies Ltd. + * + * Based on arch/sh/oprofile/common.c: + * + * Copyright (C) 2003 - 2010 Paul Mundt + * + * Based on arch/mips/oprofile/common.c: + * + * Copyright (C) 2004, 2005 Ralf Baechle + * Copyright (C) 2005 MIPS Technologies, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/oprofile.h> +#include <linux/perf_event.h> +#include <linux/slab.h> + +#include "backtrace.h" + +#ifdef CONFIG_HW_PERF_EVENTS +/* + * This will need to be reworked when multiple PMUs are supported. + */ +static char *metag_pmu_op_name; + +char *op_name_from_perf_id(void) +{ + return metag_pmu_op_name; +} + +int __init oprofile_arch_init(struct oprofile_operations *ops) +{ + ops->backtrace = metag_backtrace; + + if (perf_num_counters() == 0) + return -ENODEV; + + metag_pmu_op_name = kasprintf(GFP_KERNEL, "metag/%s", + perf_pmu_name()); + if (unlikely(!metag_pmu_op_name)) + return -ENOMEM; + + return oprofile_perf_init(ops); +} + +void oprofile_arch_exit(void) +{ + oprofile_perf_exit(); + kfree(metag_pmu_op_name); +} +#else +int __init oprofile_arch_init(struct oprofile_operations *ops) +{ + ops->backtrace = metag_backtrace; + /* fall back to timer interrupt PC sampling */ + return -ENODEV; +} +void oprofile_arch_exit(void) {} +#endif /* CONFIG_HW_PERF_EVENTS */ |