From: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> To: linux-snps-arc@lists.infradead.org, Vineet Gupta <Vineet.Gupta1@synopsys.com> Cc: linux-kernel@vger.kernel.org, Alexey Brodkin <Alexey.Brodkin@synopsys.com>, Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@redhat.com>, Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Subject: [RFC] ARC: initial ftrace support Date: Fri, 27 Mar 2020 18:53:55 +0300 [thread overview] Message-ID: <20200327155355.18668-1-Eugeniy.Paltsev@synopsys.com> (raw) Add initial ftrace support for ARCv2. We add support only for function tracer (the simplest, not dynamic one), however it is prerequisite for dynamic function tracer and other complex ones. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> --- arch/arc/Kconfig | 1 + arch/arc/include/asm/Kbuild | 1 - arch/arc/include/asm/ftrace.h | 16 ++++++++++++++++ arch/arc/kernel/Makefile | 10 ++++++++++ arch/arc/kernel/ftrace.c | 27 +++++++++++++++++++++++++++ 5 files changed, 54 insertions(+), 1 deletion(-) create mode 100644 arch/arc/include/asm/ftrace.h create mode 100644 arch/arc/kernel/ftrace.c diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index ff2a393b635c..4b8f750bd32b 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -48,6 +48,7 @@ config ARC select PCI_SYSCALL if PCI select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32 + select HAVE_FUNCTION_TRACER if ISA_ARCV2 config ARCH_HAS_CACHE_LINE_SIZE def_bool y diff --git a/arch/arc/include/asm/Kbuild b/arch/arc/include/asm/Kbuild index 1b505694691e..4e2f55bdf2ff 100644 --- a/arch/arc/include/asm/Kbuild +++ b/arch/arc/include/asm/Kbuild @@ -6,7 +6,6 @@ generic-y += div64.h generic-y += dma-mapping.h generic-y += emergency-restart.h generic-y += extable.h -generic-y += ftrace.h generic-y += hardirq.h generic-y += hw_irq.h generic-y += irq_regs.h diff --git a/arch/arc/include/asm/ftrace.h b/arch/arc/include/asm/ftrace.h new file mode 100644 index 000000000000..92303e506edf --- /dev/null +++ b/arch/arc/include/asm/ftrace.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com) + * + * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> + */ + +#ifndef __ASM_ARC_FTRACE_H +#define __ASM_ARC_FTRACE_H + +extern void _mcount(unsigned long parent_ip); + +/* 3 instructions 1x 16 bit + 1x 32 bit */ +#define MCOUNT_INSN_SIZE 6 + +#endif /* __ASM_ARC_FTRACE_H */ diff --git a/arch/arc/kernel/Makefile b/arch/arc/kernel/Makefile index 75539670431a..42c9c4b1cabd 100644 --- a/arch/arc/kernel/Makefile +++ b/arch/arc/kernel/Makefile @@ -22,12 +22,22 @@ obj-$(CONFIG_ARC_METAWARE_HLINK) += arc_hostlink.o obj-$(CONFIG_PERF_EVENTS) += perf_event.o obj-$(CONFIG_JUMP_LABEL) += jump_label.o + +obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o + +ifdef CONFIG_FUNCTION_TRACER +CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE) +endif + obj-$(CONFIG_ARC_FPU_SAVE_RESTORE) += fpu.o ifdef CONFIG_ISA_ARCOMPACT CFLAGS_fpu.o += -mdpfp endif ifdef CONFIG_ARC_DW2_UNWIND +ifdef CONFIG_FUNCTION_TRACER +CFLAGS_REMOVE_ctx_sw.o = $(CC_FLAGS_FTRACE) +endif CFLAGS_ctx_sw.o += -fno-omit-frame-pointer obj-y += ctx_sw.o else diff --git a/arch/arc/kernel/ftrace.c b/arch/arc/kernel/ftrace.c new file mode 100644 index 000000000000..a61edf52bfe2 --- /dev/null +++ b/arch/arc/kernel/ftrace.c @@ -0,0 +1,27 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com) + * + * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> + */ + +#include <linux/ftrace.h> + +noinline void ftrace_stub(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct pt_regs *regs) +{ + /* do notning */ +} + +extern void (*ftrace_trace_function)(unsigned long, unsigned long, + struct ftrace_ops*, struct pt_regs*); + +noinline void _mcount(unsigned long parent_ip) +{ + unsigned long ip = (unsigned long)__builtin_return_address(0); + + if (unlikely(ftrace_trace_function != ftrace_stub)) + ftrace_trace_function(ip - MCOUNT_INSN_SIZE, parent_ip, + NULL, NULL); +} +EXPORT_SYMBOL(_mcount); -- 2.21.1
WARNING: multiple messages have this Message-ID (diff)
From: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> To: linux-snps-arc@lists.infradead.org, Vineet Gupta <Vineet.Gupta1@synopsys.com> Cc: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>, Alexey Brodkin <Alexey.Brodkin@synopsys.com>, Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org> Subject: [RFC] ARC: initial ftrace support Date: Fri, 27 Mar 2020 18:53:55 +0300 [thread overview] Message-ID: <20200327155355.18668-1-Eugeniy.Paltsev@synopsys.com> (raw) Add initial ftrace support for ARCv2. We add support only for function tracer (the simplest, not dynamic one), however it is prerequisite for dynamic function tracer and other complex ones. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> --- arch/arc/Kconfig | 1 + arch/arc/include/asm/Kbuild | 1 - arch/arc/include/asm/ftrace.h | 16 ++++++++++++++++ arch/arc/kernel/Makefile | 10 ++++++++++ arch/arc/kernel/ftrace.c | 27 +++++++++++++++++++++++++++ 5 files changed, 54 insertions(+), 1 deletion(-) create mode 100644 arch/arc/include/asm/ftrace.h create mode 100644 arch/arc/kernel/ftrace.c diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index ff2a393b635c..4b8f750bd32b 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -48,6 +48,7 @@ config ARC select PCI_SYSCALL if PCI select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32 + select HAVE_FUNCTION_TRACER if ISA_ARCV2 config ARCH_HAS_CACHE_LINE_SIZE def_bool y diff --git a/arch/arc/include/asm/Kbuild b/arch/arc/include/asm/Kbuild index 1b505694691e..4e2f55bdf2ff 100644 --- a/arch/arc/include/asm/Kbuild +++ b/arch/arc/include/asm/Kbuild @@ -6,7 +6,6 @@ generic-y += div64.h generic-y += dma-mapping.h generic-y += emergency-restart.h generic-y += extable.h -generic-y += ftrace.h generic-y += hardirq.h generic-y += hw_irq.h generic-y += irq_regs.h diff --git a/arch/arc/include/asm/ftrace.h b/arch/arc/include/asm/ftrace.h new file mode 100644 index 000000000000..92303e506edf --- /dev/null +++ b/arch/arc/include/asm/ftrace.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com) + * + * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> + */ + +#ifndef __ASM_ARC_FTRACE_H +#define __ASM_ARC_FTRACE_H + +extern void _mcount(unsigned long parent_ip); + +/* 3 instructions 1x 16 bit + 1x 32 bit */ +#define MCOUNT_INSN_SIZE 6 + +#endif /* __ASM_ARC_FTRACE_H */ diff --git a/arch/arc/kernel/Makefile b/arch/arc/kernel/Makefile index 75539670431a..42c9c4b1cabd 100644 --- a/arch/arc/kernel/Makefile +++ b/arch/arc/kernel/Makefile @@ -22,12 +22,22 @@ obj-$(CONFIG_ARC_METAWARE_HLINK) += arc_hostlink.o obj-$(CONFIG_PERF_EVENTS) += perf_event.o obj-$(CONFIG_JUMP_LABEL) += jump_label.o + +obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o + +ifdef CONFIG_FUNCTION_TRACER +CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE) +endif + obj-$(CONFIG_ARC_FPU_SAVE_RESTORE) += fpu.o ifdef CONFIG_ISA_ARCOMPACT CFLAGS_fpu.o += -mdpfp endif ifdef CONFIG_ARC_DW2_UNWIND +ifdef CONFIG_FUNCTION_TRACER +CFLAGS_REMOVE_ctx_sw.o = $(CC_FLAGS_FTRACE) +endif CFLAGS_ctx_sw.o += -fno-omit-frame-pointer obj-y += ctx_sw.o else diff --git a/arch/arc/kernel/ftrace.c b/arch/arc/kernel/ftrace.c new file mode 100644 index 000000000000..a61edf52bfe2 --- /dev/null +++ b/arch/arc/kernel/ftrace.c @@ -0,0 +1,27 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com) + * + * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> + */ + +#include <linux/ftrace.h> + +noinline void ftrace_stub(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct pt_regs *regs) +{ + /* do notning */ +} + +extern void (*ftrace_trace_function)(unsigned long, unsigned long, + struct ftrace_ops*, struct pt_regs*); + +noinline void _mcount(unsigned long parent_ip) +{ + unsigned long ip = (unsigned long)__builtin_return_address(0); + + if (unlikely(ftrace_trace_function != ftrace_stub)) + ftrace_trace_function(ip - MCOUNT_INSN_SIZE, parent_ip, + NULL, NULL); +} +EXPORT_SYMBOL(_mcount); -- 2.21.1 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
next reply other threads:[~2020-03-27 15:54 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-27 15:53 Eugeniy Paltsev [this message] 2020-03-27 15:53 ` [RFC] ARC: initial ftrace support Eugeniy Paltsev 2020-03-27 17:10 ` Steven Rostedt 2020-03-27 17:10 ` Steven Rostedt 2020-04-02 1:17 ` Vineet Gupta 2020-04-02 1:17 ` Vineet Gupta 2020-04-02 8:10 ` Claudiu Zissulescu Ianculescu 2020-04-02 8:10 ` Claudiu Zissulescu Ianculescu 2020-04-02 14:15 ` Alexey Brodkin 2020-04-02 14:15 ` Alexey Brodkin 2020-05-14 13:09 ` Eugeniy Paltsev 2020-05-14 13:09 ` Eugeniy Paltsev 2020-04-02 17:52 ` Steven Rostedt 2020-04-02 17:52 ` Steven Rostedt
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