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tile: support ftrace on tilegx
This commit adds support for static ftrace, graph function support, and dynamic tracer support. Signed-off-by: Tony Lu <zlu@tilera.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Tony Lu
Chris Metcalf
parent
9ae0983847
commit
a61fd5e366
@ -119,7 +119,12 @@ config HVC_TILE
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def_bool y
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config TILEGX
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bool "Building with TILE-Gx (64-bit) compiler and toolchain"
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bool "Building for TILE-Gx (64-bit) processor"
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select HAVE_FUNCTION_TRACER
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select HAVE_FUNCTION_TRACE_MCOUNT_TEST
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select HAVE_FUNCTION_GRAPH_TRACER
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select HAVE_DYNAMIC_FTRACE
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select HAVE_FTRACE_MCOUNT_RECORD
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config TILEPRO
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def_bool !TILEGX
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@ -15,6 +15,26 @@
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#ifndef _ASM_TILE_FTRACE_H
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#define _ASM_TILE_FTRACE_H
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/* empty */
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#ifdef CONFIG_FUNCTION_TRACER
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#define MCOUNT_ADDR ((unsigned long)(__mcount))
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#define MCOUNT_INSN_SIZE 8 /* sizeof mcount call */
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#ifndef __ASSEMBLY__
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extern void __mcount(void);
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#ifdef CONFIG_DYNAMIC_FTRACE
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static inline unsigned long ftrace_call_adjust(unsigned long addr)
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{
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return addr;
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}
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struct dyn_arch_ftrace {
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};
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_FUNCTION_TRACER */
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#endif /* _ASM_TILE_FTRACE_H */
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@ -9,6 +9,11 @@ obj-y := backtrace.o entry.o hvglue.o irq.o messaging.o \
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sysfs.o time.o traps.o unaligned.o vdso.o \
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intvec_$(BITS).o regs_$(BITS).o tile-desc_$(BITS).o
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ifdef CONFIG_FUNCTION_TRACER
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CFLAGS_REMOVE_ftrace.o = -pg
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CFLAGS_REMOVE_early_printk.o = -pg
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endif
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obj-$(CONFIG_HARDWALL) += hardwall.o
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obj-$(CONFIG_COMPAT) += compat.o compat_signal.o
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obj-$(CONFIG_SMP) += smpboot.o smp.o tlb.o
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@ -22,5 +27,6 @@ obj-$(CONFIG_PCI) += pci.o
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endif
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obj-$(CONFIG_TILE_USB) += usb.o
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obj-$(CONFIG_TILE_HVGLUE_TRACE) += hvglue_trace.o
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obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o mcount_64.o
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obj-y += vdso/
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246
arch/tile/kernel/ftrace.c
Normal file
246
arch/tile/kernel/ftrace.c
Normal file
@ -0,0 +1,246 @@
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/*
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* Copyright 2012 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* TILE-Gx specific ftrace support
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*/
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#include <linux/ftrace.h>
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#include <linux/uaccess.h>
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#include <asm/cacheflush.h>
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#include <asm/ftrace.h>
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#include <asm/sections.h>
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#include <arch/opcode.h>
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#ifdef CONFIG_DYNAMIC_FTRACE
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static inline tilegx_bundle_bits NOP(void)
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{
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return create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) |
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create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) |
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create_Opcode_X0(RRR_0_OPCODE_X0) |
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create_UnaryOpcodeExtension_X1(NOP_UNARY_OPCODE_X1) |
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create_RRROpcodeExtension_X1(UNARY_RRR_0_OPCODE_X1) |
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create_Opcode_X1(RRR_0_OPCODE_X1);
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}
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static int machine_stopped __read_mostly;
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int ftrace_arch_code_modify_prepare(void)
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{
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machine_stopped = 1;
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return 0;
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}
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int ftrace_arch_code_modify_post_process(void)
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{
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flush_icache_range(0, CHIP_L1I_CACHE_SIZE());
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machine_stopped = 0;
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return 0;
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}
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/*
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* Put { move r10, lr; jal ftrace_caller } in a bundle, this lets dynamic
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* tracer just add one cycle overhead to every kernel function when disabled.
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*/
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static unsigned long ftrace_gen_branch(unsigned long pc, unsigned long addr,
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bool link)
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{
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tilegx_bundle_bits opcode_x0, opcode_x1;
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long pcrel_by_instr = (addr - pc) >> TILEGX_LOG2_BUNDLE_SIZE_IN_BYTES;
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if (link) {
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/* opcode: jal addr */
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opcode_x1 =
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create_Opcode_X1(JUMP_OPCODE_X1) |
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create_JumpOpcodeExtension_X1(JAL_JUMP_OPCODE_X1) |
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create_JumpOff_X1(pcrel_by_instr);
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} else {
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/* opcode: j addr */
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opcode_x1 =
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create_Opcode_X1(JUMP_OPCODE_X1) |
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create_JumpOpcodeExtension_X1(J_JUMP_OPCODE_X1) |
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create_JumpOff_X1(pcrel_by_instr);
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}
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if (addr == FTRACE_ADDR) {
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/* opcode: or r10, lr, zero */
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opcode_x0 =
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create_Dest_X0(10) |
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create_SrcA_X0(TREG_LR) |
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create_SrcB_X0(TREG_ZERO) |
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create_RRROpcodeExtension_X0(OR_RRR_0_OPCODE_X0) |
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create_Opcode_X0(RRR_0_OPCODE_X0);
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} else {
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/* opcode: fnop */
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opcode_x0 =
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create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) |
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create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) |
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create_Opcode_X0(RRR_0_OPCODE_X0);
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}
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return opcode_x1 | opcode_x0;
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}
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static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec)
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{
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return NOP();
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}
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static unsigned long ftrace_call_replace(unsigned long pc, unsigned long addr)
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{
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return ftrace_gen_branch(pc, addr, true);
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}
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static int ftrace_modify_code(unsigned long pc, unsigned long old,
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unsigned long new)
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{
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unsigned long pc_wr;
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/* Check if the address is in kernel text space and module space. */
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if (!kernel_text_address(pc))
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return -EINVAL;
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/* Operate on writable kernel text mapping. */
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pc_wr = pc - MEM_SV_START + PAGE_OFFSET;
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if (probe_kernel_write((void *)pc_wr, &new, MCOUNT_INSN_SIZE))
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return -EPERM;
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smp_wmb();
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if (!machine_stopped && num_online_cpus() > 1)
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flush_icache_range(pc, pc + MCOUNT_INSN_SIZE);
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return 0;
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}
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int ftrace_update_ftrace_func(ftrace_func_t func)
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{
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unsigned long pc, old;
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unsigned long new;
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int ret;
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pc = (unsigned long)&ftrace_call;
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memcpy(&old, &ftrace_call, MCOUNT_INSN_SIZE);
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new = ftrace_call_replace(pc, (unsigned long)func);
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ret = ftrace_modify_code(pc, old, new);
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return ret;
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}
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int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
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{
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unsigned long new, old;
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unsigned long ip = rec->ip;
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old = ftrace_nop_replace(rec);
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new = ftrace_call_replace(ip, addr);
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return ftrace_modify_code(rec->ip, old, new);
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}
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int ftrace_make_nop(struct module *mod,
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struct dyn_ftrace *rec, unsigned long addr)
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{
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unsigned long ip = rec->ip;
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unsigned long old;
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unsigned long new;
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int ret;
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old = ftrace_call_replace(ip, addr);
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new = ftrace_nop_replace(rec);
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ret = ftrace_modify_code(ip, old, new);
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return ret;
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}
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int __init ftrace_dyn_arch_init(void *data)
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{
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*(unsigned long *)data = 0;
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return 0;
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}
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
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unsigned long frame_pointer)
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{
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unsigned long return_hooker = (unsigned long) &return_to_handler;
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struct ftrace_graph_ent trace;
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unsigned long old;
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int err;
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if (unlikely(atomic_read(¤t->tracing_graph_pause)))
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return;
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old = *parent;
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*parent = return_hooker;
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err = ftrace_push_return_trace(old, self_addr, &trace.depth,
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frame_pointer);
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if (err == -EBUSY) {
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*parent = old;
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return;
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}
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trace.func = self_addr;
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/* Only trace if the calling function expects to */
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if (!ftrace_graph_entry(&trace)) {
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current->curr_ret_stack--;
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*parent = old;
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}
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}
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#ifdef CONFIG_DYNAMIC_FTRACE
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extern unsigned long ftrace_graph_call;
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static int __ftrace_modify_caller(unsigned long *callsite,
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void (*func) (void), bool enable)
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{
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unsigned long caller_fn = (unsigned long) func;
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unsigned long pc = (unsigned long) callsite;
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unsigned long branch = ftrace_gen_branch(pc, caller_fn, false);
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unsigned long nop = NOP();
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unsigned long old = enable ? nop : branch;
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unsigned long new = enable ? branch : nop;
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return ftrace_modify_code(pc, old, new);
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}
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static int ftrace_modify_graph_caller(bool enable)
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{
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int ret;
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ret = __ftrace_modify_caller(&ftrace_graph_call,
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ftrace_graph_caller,
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enable);
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return ret;
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}
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int ftrace_enable_ftrace_graph_caller(void)
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{
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return ftrace_modify_graph_caller(true);
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}
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int ftrace_disable_ftrace_graph_caller(void)
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{
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return ftrace_modify_graph_caller(false);
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}
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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224
arch/tile/kernel/mcount_64.S
Normal file
224
arch/tile/kernel/mcount_64.S
Normal file
@ -0,0 +1,224 @@
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/*
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* Copyright 2012 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* TILE-Gx specific __mcount support
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*/
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#include <linux/linkage.h>
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#include <asm/ftrace.h>
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#define REGSIZE 8
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.text
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.global __mcount
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.macro MCOUNT_SAVE_REGS
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addli sp, sp, -REGSIZE
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{
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st sp, lr
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addli r29, sp, - (12 * REGSIZE)
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}
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{
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addli sp, sp, - (13 * REGSIZE)
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st r29, sp
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}
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addli r29, r29, REGSIZE
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{ st r29, r0; addli r29, r29, REGSIZE }
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{ st r29, r1; addli r29, r29, REGSIZE }
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{ st r29, r2; addli r29, r29, REGSIZE }
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{ st r29, r3; addli r29, r29, REGSIZE }
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{ st r29, r4; addli r29, r29, REGSIZE }
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{ st r29, r5; addli r29, r29, REGSIZE }
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{ st r29, r6; addli r29, r29, REGSIZE }
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{ st r29, r7; addli r29, r29, REGSIZE }
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{ st r29, r8; addli r29, r29, REGSIZE }
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{ st r29, r9; addli r29, r29, REGSIZE }
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{ st r29, r10; addli r29, r29, REGSIZE }
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.endm
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.macro MCOUNT_RESTORE_REGS
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addli r29, sp, (2 * REGSIZE)
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{ ld r0, r29; addli r29, r29, REGSIZE }
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{ ld r1, r29; addli r29, r29, REGSIZE }
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{ ld r2, r29; addli r29, r29, REGSIZE }
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{ ld r3, r29; addli r29, r29, REGSIZE }
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{ ld r4, r29; addli r29, r29, REGSIZE }
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{ ld r5, r29; addli r29, r29, REGSIZE }
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{ ld r6, r29; addli r29, r29, REGSIZE }
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{ ld r7, r29; addli r29, r29, REGSIZE }
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{ ld r8, r29; addli r29, r29, REGSIZE }
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{ ld r9, r29; addli r29, r29, REGSIZE }
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{ ld r10, r29; addli lr, sp, (13 * REGSIZE) }
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{ ld lr, lr; addli sp, sp, (14 * REGSIZE) }
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.endm
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.macro RETURN_BACK
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{ move r12, lr; move lr, r10 }
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jrp r12
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.endm
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#ifdef CONFIG_DYNAMIC_FTRACE
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.align 64
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STD_ENTRY(__mcount)
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__mcount:
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j ftrace_stub
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STD_ENDPROC(__mcount)
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.align 64
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STD_ENTRY(ftrace_caller)
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moveli r11, hw2_last(function_trace_stop)
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{ shl16insli r11, r11, hw1(function_trace_stop); move r12, lr }
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{ shl16insli r11, r11, hw0(function_trace_stop); move lr, r10 }
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ld r11, r11
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beqz r11, 1f
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jrp r12
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1:
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{ move r10, lr; move lr, r12 }
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MCOUNT_SAVE_REGS
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/* arg1: self return address */
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/* arg2: parent's return address */
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{ move r0, lr; move r1, r10 }
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.global ftrace_call
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ftrace_call:
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/*
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* a placeholder for the call to a real tracing function, i.e.
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* ftrace_trace_function()
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*/
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nop
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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.global ftrace_graph_call
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ftrace_graph_call:
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/*
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* a placeholder for the call to a real tracing function, i.e.
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* ftrace_graph_caller()
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*/
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nop
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#endif
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MCOUNT_RESTORE_REGS
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.global ftrace_stub
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ftrace_stub:
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RETURN_BACK
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STD_ENDPROC(ftrace_caller)
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#else /* ! CONFIG_DYNAMIC_FTRACE */
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.align 64
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STD_ENTRY(__mcount)
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moveli r11, hw2_last(function_trace_stop)
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{ shl16insli r11, r11, hw1(function_trace_stop); move r12, lr }
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{ shl16insli r11, r11, hw0(function_trace_stop); move lr, r10 }
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ld r11, r11
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beqz r11, 1f
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jrp r12
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1:
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{ move r10, lr; move lr, r12 }
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{
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moveli r11, hw2_last(ftrace_trace_function)
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moveli r13, hw2_last(ftrace_stub)
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}
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{
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shl16insli r11, r11, hw1(ftrace_trace_function)
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shl16insli r13, r13, hw1(ftrace_stub)
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}
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{
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shl16insli r11, r11, hw0(ftrace_trace_function)
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shl16insli r13, r13, hw0(ftrace_stub)
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}
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ld r11, r11
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sub r14, r13, r11
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bnez r14, static_trace
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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moveli r15, hw2_last(ftrace_graph_return)
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shl16insli r15, r15, hw1(ftrace_graph_return)
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shl16insli r15, r15, hw0(ftrace_graph_return)
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ld r15, r15
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sub r15, r15, r13
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bnez r15, ftrace_graph_caller
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||||
|
||||
{
|
||||
moveli r16, hw2_last(ftrace_graph_entry)
|
||||
moveli r17, hw2_last(ftrace_graph_entry_stub)
|
||||
}
|
||||
{
|
||||
shl16insli r16, r16, hw1(ftrace_graph_entry)
|
||||
shl16insli r17, r17, hw1(ftrace_graph_entry_stub)
|
||||
}
|
||||
{
|
||||
shl16insli r16, r16, hw0(ftrace_graph_entry)
|
||||
shl16insli r17, r17, hw0(ftrace_graph_entry_stub)
|
||||
}
|
||||
ld r16, r16
|
||||
sub r17, r16, r17
|
||||
bnez r17, ftrace_graph_caller
|
||||
|
||||
#endif
|
||||
RETURN_BACK
|
||||
|
||||
static_trace:
|
||||
MCOUNT_SAVE_REGS
|
||||
|
||||
/* arg1: self return address */
|
||||
/* arg2: parent's return address */
|
||||
{ move r0, lr; move r1, r10 }
|
||||
|
||||
/* call ftrace_trace_function() */
|
||||
jalr r11
|
||||
|
||||
MCOUNT_RESTORE_REGS
|
||||
|
||||
.global ftrace_stub
|
||||
ftrace_stub:
|
||||
RETURN_BACK
|
||||
STD_ENDPROC(__mcount)
|
||||
|
||||
#endif /* ! CONFIG_DYNAMIC_FTRACE */
|
||||
|
||||
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||
|
||||
STD_ENTRY(ftrace_graph_caller)
|
||||
ftrace_graph_caller:
|
||||
#ifndef CONFIG_DYNAMIC_FTRACE
|
||||
MCOUNT_SAVE_REGS
|
||||
#endif
|
||||
|
||||
/* arg1: Get the location of the parent's return address */
|
||||
addi r0, sp, 12 * REGSIZE
|
||||
/* arg2: Get self return address */
|
||||
move r1, lr
|
||||
|
||||
jal prepare_ftrace_return
|
||||
|
||||
MCOUNT_RESTORE_REGS
|
||||
RETURN_BACK
|
||||
STD_ENDPROC(ftrace_graph_caller)
|
||||
|
||||
.global return_to_handler
|
||||
return_to_handler:
|
||||
MCOUNT_SAVE_REGS
|
||||
|
||||
jal ftrace_return_to_handler
|
||||
/* restore the real parent address */
|
||||
move r11, r0
|
||||
|
||||
MCOUNT_RESTORE_REGS
|
||||
jr r11
|
||||
|
||||
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
||||
@ -43,6 +43,7 @@ SECTIONS
|
||||
HEAD_TEXT
|
||||
SCHED_TEXT
|
||||
LOCK_TEXT
|
||||
IRQENTRY_TEXT
|
||||
__fix_text_end = .; /* tile-cpack won't rearrange before this */
|
||||
TEXT_TEXT
|
||||
*(.text.*)
|
||||
|
||||
@ -33,6 +33,12 @@ EXPORT_SYMBOL(dump_stack);
|
||||
/* arch/tile/kernel/head.S */
|
||||
EXPORT_SYMBOL(empty_zero_page);
|
||||
|
||||
#ifdef CONFIG_FUNCTION_TRACER
|
||||
/* arch/tile/kernel/mcount_64.S */
|
||||
#include <asm/ftrace.h>
|
||||
EXPORT_SYMBOL(__mcount);
|
||||
#endif /* CONFIG_FUNCTION_TRACER */
|
||||
|
||||
/* arch/tile/lib/, various memcpy files */
|
||||
EXPORT_SYMBOL(memcpy);
|
||||
EXPORT_SYMBOL(__copy_to_user_inatomic);
|
||||
|
||||
@ -364,6 +364,10 @@ if ($arch eq "x86_64") {
|
||||
} elsif ($arch eq "blackfin") {
|
||||
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s__mcount\$";
|
||||
$mcount_adjust = -4;
|
||||
} elsif ($arch eq "tilegx") {
|
||||
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s__mcount\$";
|
||||
$type = ".quad";
|
||||
$alignment = 8;
|
||||
} else {
|
||||
die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user